Patent Publication Number: US-2022223040-A1

Title: Vehicle control system, method and a computer program product for energy efficient driving

Description:
RELATED APPLICATION DATA 
     This application is a continuation of International Patent Application No. PCT/CN2020/121281, filed Oct. 15, 2020, which claims the benefit of European Patent Application No. 19204084.8, filed Oct. 18, 2019, the disclosures of which are incorporated herein by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a vehicle control system and a method for energy efficient driving when a vehicle is approaching a stop point. 
     BACKGROUND 
     Today when a vehicle is approaching a stop point, such an intersection with a traffic light or a roundabout with traffic, the vehicle occupant of the vehicle needs to observe the traffic situation, e.g. if the traffic light at an intersection is signaling red or if the vehicle needs to give way for other traffic in a roundabout, dependent on the intended route of the vehicle. 
     If the vehicle is for example approaching a traffic light that is signaling red for the intended route, then the vehicle needs to come to a stop before the red light. It is common that vehicle occupants maintain a drive load on the engine even if the red light is observed and the vehicle occupant knows that the vehicle needs to come to a stop. The effect is often that the vehicle occupant needs to brake the vehicle when the vehicle is close to the red light. 
     An energy efficient way to come to a stop when approaching a stop point is to release the engine from drive load and let the vehicle just roll all the way up to the traffic light before coming to a full stop. This also e.g. minimizes wear of the brakes of the vehicle. The traffic light may even change to green while rolling, and a full stop can then be avoided. In this way energy can be saved compared to keeping a drive load on the engine. 
     For an electric vehicle, the rolling can be used for charging the batteries of the electric vehicle, and hence energy is not only saved, but even stored. 
     It is however not always desirable to release the engine from drive load and let the vehicle just roll all the way up to the traffic light before coming to a full stop since there may be other directions open at the traffic light where there is no need to come to a stop. In the example when the vehicle is approaching a traffic light that is signaling red for the intended route, the same traffic light may be signaling green for another direction other than the intended route of the vehicle. Such other directions may be desirable directions for other vehicles behind the vehicle that are approaching the traffic light, and the vehicle may then block other vehicles that have a desire to go in the direction that is green. Therefore, considerations where others vehicles are going is desirable in order to apply energy efficient driving in some situations. It can be difficult for a vehicle occupant to judge where other vehicles are going. 
     The same principles apply to autonomous vehicles. Further, in an autonomous vehicle there may however not be a vehicle occupant in the vehicle that can observe the traffic situation when approaching a stop point. 
     Energy efficient driving is desired both for autonomous vehicles and non-autonomous vehicles in order to preserve energy. 
     SUMMARY 
     It is an object of the present disclosure to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above mentioned problem. For a non-autonomous vehicle there is a need for a control system that can support the vehicle occupant in driving the vehicle in an energy efficient way. For an autonomous vehicle, there is a further need to replace the vehicle occupant that is observing the traffic situation with a control system that is configured to automatically support with decisions for autonomous driving of the vehicle. 
     According to a first aspect there is provided a vehicle control system for energy efficient driving, the vehicle control system comprises: a processing circuitry configured to cause the vehicle control system to: determine that the vehicle is approaching a stop point; determine if the vehicle needs to stop at the stop point; determine the presence of at least a first other vehicle within a predefined distance behind the vehicle; and determine the intended route of the at least first other vehicle. 
     An advantage with this aspect is that with knowledge of the intended route of the at least first other vehicle, a decision to control the vehicle or to instruct a vehicle occupant can be taken considering the intended route of the least first other vehicle to avoid e.g. blocking the way for the least first other vehicle. 
     According to some embodiments, in a determination that the at least first other vehicle is going in the same direction as the vehicle after the stop point, preparing at least a first energy saving action. 
     Knowing that the at least first other vehicle is going in the same direction means that the vehicle is not blocking the way for the at least first other vehicle, and hence a first energy saving action can be prepared, such as releasing the engine from drive load. 
     According to some embodiments, in a determination that the at least first other vehicle is going in another direction as the vehicle after the stop point, preparing at least a first energy saving action only when the at least first other vehicle is in a different lane, other than the lane of the vehicle, for avoiding blocking the way for the at least first other vehicle. 
     Knowing that the at least first other vehicle is going another direction means that the vehicle is blocking the way for the at least first other vehicle when the vehicle and the at least first other vehicle are in the same lane, and by waiting with preparing for the at least first energy saving action until the at least first other vehicle is in another lane it can be avoided that the vehicle is blocking the way for the at least first other vehicle. 
     According to some embodiments, the vehicle control system further comprises: a wireless communication unit, operatively connected to the processing circuitry, configured to communicate via a wireless communication network, the processing circuitry is further configured to cause the vehicle control system to: send, by the vehicle, a request for a traffic information data message indicative of a request for the intended route of at least a first other vehicle behind the vehicle; receive, at the vehicle, the traffic information data message indicative of the intended route of the at least first other vehicle behind the vehicle. 
     Information of the intended route of the at least first other vehicle can hence be provided wirelessly to the vehicle over the air in a traffic information data message that is informing the vehicle of the intended route of the at least first other vehicle. 
     According to some embodiments, the vehicle control system further comprises: at least a first exterior view camera operatively connected to the processing circuitry configured to obtain image data of the surroundings of the vehicle, the processing circuitry is further configured to cause the vehicle control system to: obtain, by at least a first exterior view camera of the vehicle, image data of the surroundings of the vehicle; and determine an intended route of at least a first other vehicle behind the vehicle based on the obtained image data. 
     Information of the intended route of the at least first other vehicle can hence be provided via image data of the surroundings of the vehicle, providing information about the intended route of the at least first other vehicle. 
     According to a second aspect there is provided a method for energy efficient driving of a vehicle, the method comprising: determining that the vehicle is approaching a stop point; determining if the vehicle needs to stop at the stop point; determining the presence of at least a first other vehicle within a predefined distance behind the vehicle; and determining the intended route of the at least first other vehicle. 
     An advantage with this aspect is that with knowledge of the intended route of the at least first other vehicle, a decision to control the vehicle or to instruct a vehicle occupant can be taken considering the intended route of the least first other vehicle to avoid e.g. blocking the way for the least first other vehicle. 
     According to some embodiments, in a determination that the at least first other vehicle is going in the same direction as the vehicle after the stop point, preparing at least a first energy saving action. 
     Knowing that the at least first other vehicle is going in the same direction means that the vehicle is not blocking the way for the at least first other vehicle, and hence a first energy saving action can be prepared, such as releasing the engine from drive load. 
     According to some embodiments, in a determination that the at least first other vehicle is going in another direction as the vehicle after the stop point, preparing at least a first energy saving action only when the at least first other vehicle is in a different lane, other than the lane of the vehicle, for avoiding blocking the way for the at least first other vehicle. 
     Knowing that the at least first other vehicle is going another direction means that the vehicle is blocking the way for the at least first other vehicle when the vehicle and the at least first other vehicle are in the same lane, and by waiting with preparing for the at least first energy saving action until the at least first other vehicle is in another lane it can be avoided that the vehicle is blocking the way for the at least first other vehicle. 
     According to some embodiments, the method further comprises: sending, by the vehicle, a request for a traffic information data message indicative of a request for the intended route of at least a first other vehicle behind the vehicle; receiving, at the vehicle, the traffic information data message indicative of the intended route of the at least first other vehicle behind the vehicle. 
     Information of the intended route of the at least first other vehicle can hence be provided wirelessly to the vehicle over the air in a traffic information data message that is informing the vehicle of the intended route of the at least first other vehicle. 
     According to some embodiments, the traffic information data message is sent and received via at least any of a wireless Vehicle-to-vehicle communication network; a wireless Vehicle-to-Infrastructure communication network; a wireless Internet communication network. 
     Information of the intended route of the at least first other vehicle can hence be provided wirelessly to the vehicle over the air, via direct communication between the vehicle and the at least first other vehicle, and/or via communication between the vehicle and an infrastructure node, and/or via communication between the vehicle and a wireless Internet communication network node. 
     According to some embodiments, the method further comprises obtaining, by at least a first exterior view camera of the vehicle, image data of the surroundings of the vehicle; and determining an intended route of at least a first other vehicle behind the vehicle based on the obtained image data. 
     Information of the intended route of the at least first other vehicle can hence be provided via image data of the surroundings of the vehicle, providing information about the intended route of the at least first other vehicle. 
     According to some embodiments, the determination of the intended route the method comprises a determination of at least any of an indication that a turn signal of the at least first other vehicle is on or that the at least first other vehicle is changing lane. 
     With knowledge of an activated turn signal, it can be determined that the at least first other vehicle is going in a certain direction, and with knowledge of that the at least first other vehicle is changing lane it can also be determined that the at least first other vehicle is going in a certain direction. 
     According to some embodiments, determining if the vehicle needs to stop at the stop point comprises receiving by the vehicle a stop signal via at least any of a wireless Vehicle-to-vehicle communication network; a wireless Vehicle-to-Infrastructure communication network; a wireless Internet communication network, indicative of that the vehicle needs to stop at the stop point. 
     The vehicle can hence be informed wirelessly over the air in stop signal data message that the vehicle needs to stop at a certain stop point that is approaching. 
     According to some embodiments, determining if the vehicle needs to stop at the stop point comprises: obtaining, by at least a first exterior view camera of the vehicle, image data of the surroundings of the vehicle; and determining stop information based on the obtained image data. 
     The vehicle can hence be informed via image data of the surroundings of the vehicle, that the vehicle needs to stop at a certain stop point that is approaching, e.g. via a determination of a traffic light signaling red. 
     According to a third aspect there is provided a computer program product comprising a non-transitory computer readable medium, having thereon a computer program comprising program instructions, the computer program being loadable into a processing circuitry and configured to cause execution of the method when the computer program is run by the at least one processing circuitry. 
     Effects and features of the second and third aspects are to a large extent analogous to those described above in connection with the first aspect. Embodiments mentioned in relation to the first aspect are largely compatible with the second and third aspects. 
     The present disclosure will become apparent from the detailed description given below. The detailed description and specific examples disclose preferred embodiments of the disclosure by way of illustration only. Those skilled in the art understand from guidance in the detailed description that changes and modifications may be made within the scope of the disclosure. 
     Hence, it is to be understood that the herein disclosed disclosure is not limited to the particular component parts of the device described or steps of the methods described since such device and method may vary. It is also to be understood that the terminology used herein is for purpose of describing particular embodiments only, and is not intended to be limiting. It should be noted that, as used in the specification and the appended claim, the articles “a”, “an”, “the”, and “said” are intended to mean that there are one or more of the elements unless the context explicitly dictates otherwise. Thus, for example, reference to “a unit” or “the unit” may include several devices, and the like. Furthermore, the words “comprising”, “including”, “containing” and similar wordings does not exclude other elements or steps. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above objects, as well as additional objects, features and advantages of the present disclosure, will be more fully appreciated by reference to the following illustrative and non-limiting detailed description of example embodiments of the present disclosure, when taken in conjunction with the accompanying drawings. 
         FIG. 1  illustrates an overview of the vehicle control system. 
         FIG. 2A  illustrates an example when the vehicle and a first other vehicle are approaching a stop point at a traffic light when the intended route of the first other vehicle is not determined. 
         FIG. 2B  illustrates an example when the vehicle and the first other vehicle are approaching a stop point at a traffic light when the intended route of the first other vehicle is determined. 
         FIG. 3  illustrates an example when the vehicle and a first other vehicle, a second other vehicle and a third other vehicle are approaching a stop point at a traffic light. 
         FIG. 4  illustrates an example when the vehicle, a first other vehicle and a second other vehicle are approaching a stop point at a roundabout. 
         FIG. 5  illustrates a flow chart of the method steps according to the second aspect of the disclosure. 
         FIG. 6  illustrates a computer program product according to the third aspect of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure will now be described with reference to the accompanying drawings, in which preferred example embodiments of the disclosure are shown. The disclosure may, however, be embodied in other forms and should not be construed as limited to the herein disclosed embodiments. The disclosed embodiments are provided to fully convey the scope of the disclosure to the skilled person. 
     The first aspect of this disclosure shows a vehicle control system  100  for energy efficient driving.  FIG. 1  illustrates an overview of the vehicle control system. The vehicle control system  100  comprises a processing circuitry  102   a ,  102   b . According to some embodiments the processing circuitry  102   a  is the processing circuitry of an on-board vehicle computer. According to some embodiments the processing circuitry  102   b  is comprised in an electronic device  800  connected to the vehicle control system  100  via a wireless communication network  50 , as illustrated in  FIG. 1 . 
     According to some embodiments the vehicle control system  100  further comprises a memory  101   a ,  101   b  configured to store data. According to some embodiments the memory  101   a  is the memory of an on-board vehicle computer. According to some embodiments the memory  101   b  is comprised in an electronic device  800  connected to the vehicle control system  100  via a wireless communication network  50 , as illustrated in  FIG. 1 . 
     In one example the wireless communication network  50 , as illustrated in  FIG. 1  is a standardized wireless local area network such as a Wireless Local Area Network, WLAN, Bluetooth™, ZigBee, Ultra-Wideband, Radio Frequency Identification, RFID, or similar network. In one example the wireless communication network  50  is a standardized wireless wide area network such as a Global System for Mobile Communications, GSM, Extended GSM, General Packet Radio Service, GPRS, Enhanced Data Rates for GSM Evolution, EDGE, Wideband Code Division Multiple Access, WCDMA, Long Term Evolution, LTE, Narrowband-IoT, 5G, Worldwide Interoperability for Microwave Access, WiMAX or Ultra Mobile Broadband, UMB or similar network. According to some aspects wireless communication network  50  can also be a combination of both a local area network and a wide area network. According to some embodiments the wireless communication network  50  is defined by common Internet Protocols. 
       FIG. 2A  illustrates an example when the vehicle  1  and a first other vehicle  2   a  are approaching a stop point at a traffic light when the intended route of the first other vehicle  2   a  is not determined. In a situation when the intended route of the first other vehicle  2   a  is not determined, the vehicle  1  may risk blocking the first other vehicle  2   a  if e.g. the vehicle  1  releases the engine from drive load and let the vehicle  1  to start roll the way up to the traffic light when the first other vehicle  2   a  is behind the vehicle  1  since the first other vehicle  2   a  may want to maintain the current speed and not slow down in order to be able to e.g. turn left while the traffic light is signaling green for a left turn. 
     The processing circuitry  102   a ,  102   b  is configured to cause the vehicle control system  100  to: determine that the vehicle  1  is approaching a stop point; determine if the vehicle  1  needs to stop at the stop point; determine the presence of at least a first other vehicle  2   a ,  2   b ,  2   c  within a predefined distance behind the vehicle  1 ; and determine the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c.    
     An advantage with this aspect is that with knowledge of the intended route of the at least first other vehicle  2   a , a decision to control the vehicle or instruct a vehicle occupant  5  can be taken considering the intended route of the least first other vehicle  2   a , for example as illustrated in  FIG. 2A , to avoid e.g. blocking the way for the least first other vehicle  2   a.    
     According to some embodiments, in a determination that the at least first other vehicle  2   a ,  2   b ,  2   c  is going in the same direction as the vehicle  1  after the stop point, preparing at least a first energy saving action. According to some embodiments, in a determination that the at least first other vehicle  2   a ,  2   b ,  2   c  also needs to stop at the stop point, preparing at least a first energy saving action. In this example both the vehicle  1  and the at least first other vehicle  2   a ,  2   b ,  2   c  can hence prepare at least a first energy saving action since both will have to stop at the stop point. 
     Knowing that the at least first other vehicle  2   a  is going in the same direction as the vehicle  1 , for example straight ahead, means that the vehicle  1  is not blocking the way for the at least first other vehicle  2   a , and hence a first energy saving action can be prepared, such as releasing the engine from drive load. In this example both the vehicle  1  and the at least first other vehicle  2   a ,  2   b ,  2   c  can hence prepare at least a first energy saving action since both will have to stop at the stop point. 
     According to some embodiments preparing at least a first energy saving action comprising is at least any of: releasing an engine from a drive load; turning off an engine; putting an engine in an idle mode; turning off the power supply to an engine; putting a gear box in neutral; start engine-brake the vehicle  1 ; changing gear up to engine-brake the vehicle; start rolling to the stop point; releasing the throttle; releasing a gas pedal; increase throttle; start braking; starting a battery charging operation; starting a battery charging operation for braking the vehicle  1 . According to some embodiments starting a battery charging operation may cause a braking effect on the vehicle  1  and the wear of the vehicle brakes can hence be avoided. 
     According to some embodiments, in a determination that the at least first other vehicle  2   a ,  2   b ,  2   c  is going in another direction as the vehicle  1  after the stop point, preparing at least a first energy saving action only when the at least first other vehicle  2   a ,  2   b ,  2   c  is in a different lane L 2 , other than the lane L 1  of the vehicle  1 , for avoiding blocking the way for the at least first other vehicle  2   a ,  2   b ,  2   c.    
     Knowing that the at least first other vehicle  2   a  is going another direction means that the vehicle  1  is blocking the way for the at least first other vehicle  2   a  when the vehicle  1  and the at least first other vehicle  2   a  are in the same lane, e.g. lane L 1  as illustrated in  FIG. 2A . By waiting with preparing for the at least first energy saving action until the at least first other vehicle  2   a  is in another lane, e.g. in lane L 2  as illustrated in  FIG. 2B , it can be avoided that the vehicle  1  is blocking the way for the at least first other vehicle  2   a.    
     According to some embodiments, the vehicle control system  100  further comprises: a wireless communication unit  103 . According to some embodiments the communication unit  103  is part of an on-board vehicle computer and operatively connected to the memory  101   a . The wireless communication unit  103  is operatively connected to the processing circuitry  102   a ,  102   b , configured to communicate via the wireless communication network  50 , the processing circuitry  102   a ,  102   b  is further configured to cause the vehicle control system  100  to: send, by the vehicle  1 , a request for a traffic information data message TIDM indicative of a request for the intended route of at least a first other vehicle  2   a ,  2   b ,  2   c  behind the vehicle  1 ; receive, at the vehicle  1 , the traffic information data message TIDM indicative of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  behind the vehicle  1 . 
     Information of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  can hence be provided wirelessly to the vehicle  1  over the air in a traffic information data message TIDM that is informing the vehicle  1  of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c.    
     According to some embodiments the request for a traffic information data message is limited to a request for a traffic information with respect to at least a first other vehicle  2   a ,  2   b ,  2   c  that is within a predetermined distance L from the vehicle  1 . According to some embodiments the request for a traffic information data message comprising location information data defining the geographical position of the vehicle  1 . According to some embodiments the predetermined distance L is dependent on the speed of at least any of the vehicle  1  and the at least first other vehicle  2   a ,  2   b ,  2   c . According to some embodiments the predetermined distance L is dependent on the remaining distance to the stop point of at least any of the vehicle  1  and the at least first other vehicle  2   a ,  2   b ,  2   c . According to some embodiments the predetermined distance L is dependent on a signal interval of a traffic light at the stop point. According to some embodiments the predetermined distance L is dependent on the speed limit before the stop point. 
     According to some embodiments the traffic information data message TIDM comprising at least any of: route information data from a navigation system of the at least first other vehicle  2   a ,  2   b ,  2   c ; vehicle control data of the at least first other vehicle  2   a ,  2   b ,  2   c ; historical routes of the at least first other vehicle  2   a ,  2   b ,  2   c ; driving statistics of the at least first other vehicle  2   a ,  2   b ,  2   c ; driving statistics of vehicles at the approaching the stop point; a manual response by a vehicle occupant  5  of the at least first other vehicle  2   a ,  2   b ,  2   c.    
       FIG. 3  illustrates an example when the vehicle  1  and a first other vehicle  2   a , a second other vehicle  2   b  and a third other vehicle  2   c  are approaching a stop point at a traffic light, when the intended route of the first other vehicle  2   a  and the intended route of the second other vehicle  2   b  are determined, while the intended route of the third other vehicle  2   c  is not determined since the third other vehicle  2   c  is not within a predefined distance L behind the vehicle  1 . 
     According to some aspects, in a determination that the at least first other vehicle  2   a ,  2   b ,  2   c  is going in another direction as the vehicle  1  after the stop point, preparing at least a first energy saving action when the at least first other vehicle  2   a ,  2   b ,  2   c  is not within a predetermined minimum distance Lmin behind the vehicle  1 . 
     In an example, as illustrated in  FIG. 3 , it is determined that the second other vehicle  2   b  is going in another direction as the vehicle  1  after the stop point, but that the second other vehicle  2   b  is not within a predetermined minimum distance Lmin that would make the vehicle  1  to block the way for the second other vehicle  2   b , even if the vehicle  1  is preparing at least a first energy saving action. 
       FIG. 4  illustrates an example when the vehicle  1 , a first other vehicle  2   a  and a second other vehicle  2   b  are approaching a stop point at a roundabout when the intended route of the first other vehicle and the intended route of the second other vehicle are determined. 
     In an example, as illustrated in  FIG. 4 , it is determined that the second other vehicle  2   b  is going in another direction as the vehicle  1  after the stop point namely to the right, while the vehicle  1 , and the first other vehicle  2   a  are going left in the roundabout. However, it is determined that the second other vehicle  2   b  is not within a predetermined minimum distance Lmin, that would make the vehicle  1  to block the way for the second other vehicle  2   b , even if the vehicle  1  is preparing at least a first energy saving action. 
     In a further example it is determined that the second other vehicle  2   b  is within a minimum distance of the first other vehicle  2   a , that is about to go left in the roundabout. In the example the first other vehicle  2   a  communicates to the vehicle  1  that the first other vehicle  2   a  desires to maintain speed in order not to block the way for the second other vehicle  2   b . In this further example it can therefore be determined that the vehicle  1  cannot prepare for at least a first energy saving action. 
     According to some aspects, the vehicle control system  100  further comprises: at least a first exterior view camera  12   a ,  12   b ,  12   c  configured to obtain image data im 1 , im 2 , im 3  of the surroundings of the vehicle  1 .  FIG. 1  illustrates the at least first exterior view camera  12   a ,  12   b ,  12   c . In an example the at least first exterior view camera  12   a ,  12   b ,  12   c  is mounted on the outside or on the inside of the vehicle  1 . According to some embodiments the at least first exterior view camera  12   a ,  12   b ,  12   c  is integrated into the body of the vehicle  1 . According to some embodiments the at least first exterior view camera  12   a ,  12   b ,  12   c  obtains at least first image data im 1 , im 2 , im 3  of at least a first exterior view of the surroundings outside of the vehicle  1 . According to some embodiments the at least first exterior view camera  12   a ,  12   b ,  12   c  obtains a wide angle view of the surroundings outside of the vehicle  1  by a wide angle lens of the at least first exterior view camera  12   a ,  12   b ,  12   c . According to some embodiments the at least first exterior view camera  12   a ,  12   b ,  12   c  obtains a telephoto view of the surroundings outside of the vehicle  1  by a telephoto lens of the at least first exterior view camera  12   a ,  12   b ,  12   c . According to some embodiments the vehicle control system  100  comprises a combination of different exterior view cameras  12   a ,  12   b ,  12   c  for providing both a wide angle view and a telephoto view of the surroundings outside of the vehicle  1 . According to some embodiments, as illustrated in  FIG. 1 , a first exterior view camera  12   a  and a second exterior view camera  12   b  are configured to obtain a first image data im 1  and a second image data im 2  that are overlapping. 
     The at least first exterior view camera  12   a ,  12   b ,  12   c  is operatively connected to the processing circuitry  102   a ,  102   b  and the processing circuitry  102   a ,  102   b  is further configured to cause the vehicle control system  100  to: obtain, by at least a first exterior view camera  12   a ,  12   b ,  12   c  of the vehicle  1 , image data im 1 , im 2 , im 3  of the surroundings of the vehicle  1 ; and determine an intended route of at least first other vehicle  2   a ,  2   b ,  2   c  behind the vehicle  1  based on the obtained image data im 1 , im 2 , im 3 . 
     Information of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  can hence be provided via image data im 1 , im 2 , im 3  of the surroundings of the vehicle  1 , providing information about the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c.    
     According to some aspects relative movements of the at least other vehicle  2   a ,  2   b ,  2   c  in relation to the vehicle  1  is detected in the image data im 1 , im 2 , im 3  by image processing of the image data im 1 , im 2 , im 3 . According to some embodiments a relative movement of the at least other vehicle  2   a ,  2   b ,  2   c  in relation to the ground is detected in the image data im 1 , im 2 , im 3  by image processing of the image data im 1 , im 2 , im 3 . According to some aspects the detected relative movement of the at least other vehicle  2   a ,  2   b ,  2  is used for determining the intended route of at least first other vehicle  2   a ,  2   b ,  2   c . According to some embodiments the intended route of at least first other vehicle  2   a ,  2   b ,  2   c  is used as input for determining if the vehicle  1  is going to prepare at least a first energy saving action or not. 
     According to some embodiments vehicle control system  100  further comprises a user interface  400 . According to some embodiments the user interface  400  is the user interface of an on-board vehicle computer. According to some embodiments the vehicle control system  100  further comprises at least a first display configured to display the at least first exterior view provided by the at least first exterior view camera  12   a ,  12   b ,  12   c . According to some embodiments the at least first display is a part of the vehicle control system  100 . According to some embodiments the at least first display is integrated in the dashboard of the vehicle  1 . According to some embodiments the at least first display is a head-up display that is visible at or on at least a first window of the vehicle  1 . According to some embodiments the at least first display is a separate display unit that can be placed at a desired location in the vehicle  1 . According to some embodiments the at least a first display is a touch sensible display configured to operate as the user interface  400 . According to some embodiments the processing circuitry  102   a ,  102   b  is further configured to provide driving instructions indicative of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c . According to some embodiments the driving instructions indicative of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  is provided to the display and displayed to a vehicle occupant  5  of the vehicle  1  via the user interface  400 . The driving instructions indicative of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  hence can support the vehicle occupant  5  in driving the vehicle  1  in an energy efficient way. According to some embodiments the vehicle  1  is an autonomous vehicle and the driving instructions indicative of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  is provided to a processing circuitry of an on-board vehicle computer for controlling the operation of the vehicle  1 . 
       FIG. 5  illustrates a flow chart of the method steps according to the second aspect of the disclosure. 
     The second aspect of this disclosure shows a method for energy efficient driving of a vehicle  1 , the method comprising: the step S 1  determining that the vehicle  1  is approaching a stop point; the step S 2  determining if the vehicle  1  needs to stop at the stop point; the step S 3  determining the presence of at least a first other vehicle  2   a ,  2   b ,  2   c  within a predefined distance behind the vehicle  1 ; and the step S 6  determining the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c.    
     An advantage with this aspect is that with knowledge of the intended route of the at least first other vehicle, a decision to control the vehicle or to instruct a vehicle occupant can be taken considering the intended route of the least first other vehicle to avoid e.g. blocking the way for the least first other vehicle. 
     According to some embodiments, the method comprising the step S 6   a , wherein in a determination that the at least first other vehicle  2   a ,  2   b ,  2   c  is going in the same direction as the vehicle  1  after the stop point, preparing at least a first energy saving action. 
     Knowing that the at least first other vehicle is going in the same direction means that the vehicle is not blocking the way for the at least first other vehicle, and hence a first energy saving action can be prepared, such as releasing the engine from drive load. 
     According to some embodiments, the method comprising the step S 6   b , wherein in a determination that the at least first other vehicle  2   a ,  2   b ,  2   c  is going in another direction as the vehicle  1  after the stop point, preparing at least a first energy saving action only when the at least first other vehicle  2   a ,  2   b ,  2   c  is in a different lane L 2 , other than the lane L 1  of the vehicle  1 , for avoiding blocking the way for the at least first other vehicle  2   a ,  2   b ,  2   c.    
     Knowing that the at least first other vehicle is going another direction means that the vehicle is blocking the way for the at least first other vehicle when the vehicle and the at least first other vehicle are in the same lane, and by waiting with preparing for the at least first energy saving action until the at least first other vehicle is in another lane it can be avoided that the vehicle is blocking the way for the at least first other vehicle. 
     According to some embodiments, the method further comprises the step of: S 4   a  sending, by the vehicle  1 , a request for a traffic information data message TIDM indicative of a request for the intended route of at least a first other vehicle  2   a ,  2   b ,  2   c  behind the vehicle  1 ; and the step of S 5   a  receiving, at the vehicle  1 , the traffic information data message TIDM indicative of the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  behind the vehicle  1 . 
     Information of the intended route of the at least first other vehicle can hence be provided wirelessly to the vehicle over the air in a traffic information data message that is informing the vehicle of the intended route of the at least first other vehicle. 
     According to some embodiments, the traffic information data message TIDM is sent and received via at least any of a wireless Vehicle-to-vehicle V2V communication network; a wireless Vehicle-to-Infrastructure V2I communication network; a wireless Internet communication network. 
     Information of the intended route of the at least first other vehicle can hence be provided wirelessly to the vehicle  1  over the air, via direct communication between the vehicle  1  and the at least first other vehicle  2   a ,  2   b ,  2   c , and/or via communication between the vehicle  1  and an infrastructure node  800 , and/or via communication between the vehicle and a wireless Internet communication network node. As illustrated in the  FIG. 1 , the traffic information data message TIDM, can be sent using different wireless communication interfaces. According to some embodiments the wireless Vehicle-to-vehicle V2V communication network comprising a combination of direct communication between the vehicle  1  and the at least first other vehicle  2   a ,  2   b ,  2   c  and communication between the vehicle  1  and an infrastructure node  800  for determining that the at least first other vehicle  2   a ,  2   b ,  2   c  is within a physical radio coverage radius of the vehicle  1 . According to some embodiments traffic information data is aggregated in real-time from the vehicle  1  and from the at least first other vehicle  2   a ,  2   b,c  and stored in a memory  101   b  of an infrastructure node  800  for generating a traffic information data message TIDM to a vehicle  1  upon request. 
     According to some embodiments, the method further comprises the step S 4   b  obtaining, by at least a first exterior view camera  12   a ,  12   b ,  12   c  of the vehicle  1 , image data im 1 , im 2 , im 3  of the surroundings of the vehicle  1 ; and the step S 5   b  determining an intended route of at least a first other vehicle  2   a ,  2   b ,  2   c  behind the vehicle  1  based on the obtained image data im 1 , im 2 , im 3 . 
     Information of the intended route of the at least first other vehicle can hence be provided via image data of the surroundings of the vehicle, providing information about the intended route of the at least first other vehicle. 
     According to some embodiments, the determination of the intended route the method comprises a determination of at least any of an indication that a turn signal of the at least first other vehicle  2   a ,  2   b ,  2   c  is on or that the at least first other vehicle  2   a ,  2   b ,  2   c  is changing lane. 
     According to some embodiments an indication that a turn signal of the at least first other vehicle  2   a ,  2   b ,  2   c  is on is detected in the image data im 1 , im 2 , im 3  by image processing of the image data im 1 , im 2 , im 3 . According to some aspects the turn signal of the at least first other vehicle  2   a ,  2   b ,  2   c  is used for determining the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c . According to some embodiments an indication of a left turn signal is used for determining that the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  is a left turn after the stop point. According to some embodiments an indication of a right turn signal is used for determining that the intended route of the at least first other vehicle  2   a ,  2   b ,  2   c  is a right turn after the stop point. According to some embodiments the vehicle  1  determines the number of available lanes and the available driving directions for each lane by information provided by at least any of a traffic information data message TIDM and image data im 1 , im 2 , im 3  of the surroundings of the vehicle  1 . In the example as illustrated in  FIGS. 2A and 2B  there are two lanes available, the right lane L 1  for continuing straight ahead after the stop point, and the left lane for a left turn after the stop point. In the example as illustrated in  FIG. 2B  the first other vehicle  2   a  has the left turn signal on which indicates that the first other vehicle  2   a  intends to use the left lane L 2  and then turn left after the stop point. 
     According to some embodiments a relative movement of the at least other vehicle  2   a ,  2   b ,  2   c  in relation to a line indication on the ground is detected in the image data im 1 , im 2 , im 3  by image processing of the image data im 1 , im 2 , im 3 . According to some aspects the detected relative movement of the at least other vehicle  2   a ,  2   b ,  2  in relation to the line indication on the ground is used for determining the intended route based on a line change of the at least first other vehicle  2   a ,  2   b ,  2   c . In an example with reference to  FIG. 2B  it can be determined that the first other vehicle  2   a  is changing lane by the crossing of the line that separates right line L 1  with the left line L 2 . 
     According to some embodiments the intended route of at least first other vehicle  2   a ,  2   b ,  2   c  is used as input for determining if the vehicle  1  is going to prepare at least a first energy saving action or not. 
     According to some embodiments, determining if the vehicle  1  needs to stop at the stop point comprises receiving by the vehicle  1  a stop signal data message SSDM via at least any of a wireless Vehicle-to-vehicle V2V communication network; a wireless Vehicle-to-Infrastructure V2I communication network; a wireless Internet communication network, indicative of that the vehicle  1  needs to stop at the stop point. 
     The vehicle can hence be informed wirelessly over the air, in stop signal data message SSDM, that the vehicle  1  needs to stop at a certain stop point that the vehicle  1  is approaching. According to some embodiments data defining the geographical position of the vehicle  1  and the at least other vehicle  2   a ,  2   b ,  2   c  is aggregated in real-time and stored in a memory  101   b  of an infrastructure node  800  for automatically generating a stop signal data message SSDM to be received at the vehicle  1  when the vehicle is within a predefined distance from a stop point that the vehicle  1  is approaching. In an example as illustrated in  FIG. 4 , a stop signal data message SSDM is generated to be received at the vehicle  1  based on the current traffic in the roundabout that the vehicle  1  is approaching. 
     According to some embodiments, determining if the vehicle  1  needs to stop at the stop point comprises: obtaining, by at least a first exterior view camera  12   a ,  12   b ,  12   c  of the vehicle  1 , image data im 1 , im 2 , im 3  of the surroundings of the vehicle  1 ; and determining stop information based on the obtained image data im 1 , im 2 , im 3 . 
     According to some embodiments determining stop information based on the obtained image data im 1 , im 2 , im 3  comprising image processing of the image data im 1 , im 2 , im 3  for detecting stop information in the image data im 1 , im 2 , im 3 . According to some embodiments stop information comprising at least any of a detection of a: sign, a signal, a light, a text, a symbol, a vehicle and a person. 
     The vehicle can hence be informed, via image data of the surroundings of the vehicle, that the vehicle needs to stop at a certain stop point that is approaching, e.g. via a determination of a traffic light signaling red. 
     In the example as illustrated in  FIG. 3 , the exterior view camera  12   b  of the vehicle  1  obtains image data im 2  of the surroundings of the vehicle  1 . In the example the image data im 2  comprises an image of a traffic light with a red signal. By image processing of the image data im 2  the red signal is detected as stop information. 
     The third aspect of this disclosure shows a computer program product comprising the method the second aspect comprising a non-transitory computer readable medium, having thereon a computer program comprising program instructions, the computer program being loadable into a processing circuitry  102   a ,  102   b  and configured to cause execution of the method when the computer program is run by the at least one processing circuitry  102   a ,  102   b.    
     The person skilled in the art realizes that the present disclosure is not limited to the preferred embodiments described above. The person skilled in the art further realizes that modifications and variations are possible within the scope of the appended claims. Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed disclosure, from a study of the drawings, the disclosure, and the appended claims.