Abstract:
Radio remote control over a motor vehicle and particularly of auxiliary systems installed on the vehicle is effected through an onboard controller which is integrated with the vehicle&#39;s controller area network. This arrangement increases flexibility of the system for handling different systems, and potentially more than one unrelated system.

Description:
BACKGROUND OF THE INVENTION 
   1. Technical Field 
   The invention relates to vehicle control and more particularly to control systems enabling both remote and vehicle mounted control of vehicle accessories and subsidiary systems such as aerial lifts, dump bodies, refuse compactors and concrete mixers. 
   2. Description of the Problem 
   Vehicle chassis are often called on to support operation of auxiliary systems such as aerial lifts, dump bodies, snowplows, wreckers, fluid delivery pumps, aircraft deicing equipment, refuse compactors and cement mixers. Typically these auxiliary systems require controls for operator input. In some cases the controls are simply switches or valves. Use of the controls can require the operator remain at a fixed location relative to or in the vehicle. While various remote systems allowing for operator mobility have been proposed, e.g. infrared, tethered, etc., radio has proved the most popular. An example of a system proposed for the radio remote control of a group of related systems either from controls installed on the vehicle or through a remote control device is Link, U.S. Pat. No. 5,975,162. Link proposed a system for a volatile liquid delivery vehicle which enabled remote control of power take off (PTO) for the liquid pump, of valves for control of delivery of the liquid, for transmission clutch control and for emergency shut down of the system. 
   Also well known are remote control devices for vehicle central locking systems and other specialized functions. Twelmeier et al., in German Patent Application DE 197 20 123 A1, recognized a tendency toward increasing multiplication of components as more and more onboard systems were provided with a remote controller, a receiver and on board control arrangements. Twelmeier et al. proposed a vehicle mounted system having a single receiver for receiving, demodulating, decoding and routing instructions from a plurality of different remote controllers to specific controllers for vehicle systems, e.g. to controllers for a central door locking control system and an for electric seat heating system. 
   Late 20 th  and early 21 st  century developments in motor vehicle control have moved toward placing major vehicle systems (e.g. engine, transmission, brakes) under a system controller and linking the system controllers to one another with a controller area network (CAN). The Society of Automotive Engineers (SAE) has published the J1939 standard which defines performance standards for controller area networks to be installed on motor vehicles and a protocol assuring smooth communication between controllers for major systems. The possibility of using a CAN for communication involving specialized systems using private or ad hoc signals is also provided for. The assignee of the present invention has developed vehicles incorporating two CANs, one linking the major controllers and a second, private CAN linking specialized devices which are not always, or even frequently, found across all vehicles of a class. For example, controllers for a power take off system for a utility vehicle may communicate using the private bus. Increased power demands by the power take off system may be coupled to the engine controller on the public bus through a electronic system controller (ESC)/body computer. Communication between the busses is effected by translation routines programmed into the ESC. 
   Unlicensed radio communication in the ISM (Industrial Scientific Medical) band set aside by the Federal Communications Commission has provided for considerable opportunity for new uses of radio below the maximum power outputs allowed by the FCC. The 2.4 MHZ to 2.5 MHZ band has proven particularly interesting. Commercial venders now provide a variety of equipment enabling two way communication using a wide variety of modulation schemes and frequency skipping techniques to improve bandwidth. Remote control applications of senders and receivers using the ISM bands and providing substantial bandwidth are increasingly popular. 
   It has been recognized that many of the auxiliary systems installed on vehicles, particularly commercial vehicles, are advantageously controlled remotely, or from both within or on the vehicle and remotely. Mechanical simplification of such systems promises greater flexibility in application and reduced hardware costs. 
   SUMMARY OF THE INVENTION 
   According to the invention there is provided a control system for a vehicle. A hand held or portable unit generates command signals which are communicated as messages over a radio link to a receiver installed on the vehicle. A data network installed on the vehicle passes the messages received from the hand held unit to the network for other controllers coupled to the network to detect. By appropriate programming the functionality of the user interface can be defined affording an operator the ability to pass messages on to the other controllers connected to the network. Multiple networks communicating through a gateway may be accommodated. Typically two networks are distinguished by whether messages on a particular network conform to an open, cross manufacturer standard, or whether the messages, while still conforming to the general J1939 protocol, have ad hoc meanings assigned to them by a particular manufacturer. Translation between the two major parts of the network is effected by an electrical system controller operating as the gateway between the networks. A third network segment connected to the electrical system controller may be provided for carrying status signals relating to individual switches. 
   Additional effects, features and advantages will be apparent in the written description that follows. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself however, as well as a preferred mode of use, further objects and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein: 
       FIG. 1  is a side view of a truck with an auxiliary power take off system and with which the invention is advantageously employed. 
       FIG. 2  is a block illustration of major components of the present invention. 
       FIG. 3  is a block diagram of a control system according to the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring now to the figures and particularly to  FIG. 1 , a preferred embodiment of the invention will be described. In the figure a conventional flat bed truck  12  rides on a plurality of wheels  14 . A driver usually controls the vehicle from a cab  16  positioned in the forward portion of the vehicle. An auxiliary system, here a winch  20 , powered by an hydraulic pump driven in turn by the engine, is positioned on the flat bed  22  over the rear wheels. Auxiliary systems may of course take a number of forms, with the power take off type system exemplified here being used only for illustration. The winch  20  is controlled from a panel  18  mounted on the bed just behind cab  16  or by a handheld remote control unit  200 , shown in  FIG. 2 . Panel  18  includes switches for selecting auto neutral and for requesting power take off operation to operate winch  20 . The handheld unit  200  duplicates all of the functionality of the panel  18 , and may be used for the control of other unrelated systems onboard truck  12 . While it is contemplated that the invention be applied to vehicles having internal combustion engines, it is not restricted to such vehicles nor is it restricted to power take off systems. 
   Referring to  FIG. 2 , a high level block diagram illustrates major components of the present invention. A remote hand held transceiver  200  with a user interface  201  may be used by an operator remotely located with respect to a vehicle  12 , on which are installed a number of subsidiary/auxiliary systems. Two way radio communication can be established between hand held transceiver  200  and a radio remote receiver module (RRRM)  202  which is attached to a SAE compliant J1939 CAN bus  204  which couples data between RRRM  202  and a remote power module (RPM)  206 , an electronic hydraulic control module (EHCM)  208  and an electrical system controller (ESC)  30 . Communication over CAN bus  204  a proprietary or ad hoc set of messages constructed in accordance with SAE J1939 standard. Programming of electrical system controller  30  may operate on these messages to generate messages for controllers connected to a second J1939 bus  210 . 
   J1939 bus  210  provides a datalink between powertrain components and other essential vehicle systems, including an auxiliary gauge switch pack  64 , an engine control module (ECM)  60  and a transmission control module (TCM)  61 . ESC  30  is also coupled to J1939 bus  210 . 
   Lastly, ESC  30  also receives low data rate communications over an SAE J1708 databus  220 , which links the electrical system controller to a rack of multiplexed switches  221  and a door pod  222 . 
   As can be seen generally from the foregoing description, a hand held controller generates command signals which are communicated by radio to a receiver installed on a vehicle. The receiver can communicate with other controllers over a data network installed on the vehicle. By appropriate programming the functionality of the hand held unit, its user interface can be defined to give an operator direct control over any vehicle system connected to the network. The data network itself is two networks, which are distinguished from one another by whether messages on the particular part conform to an open, cross manufacturer standard, or whether the messages, while still conforming to the general J1939 protocol, have ad hoc meanings assigned to them by a particular manufacturer. Translation between the two major parts of the network is effected by ESC  30 , which is connected to both parts and functions as a gateway between the networks. A third network segment is a low data rate link which is essentially limited to status messages for individual switches. A particular system may or may not incorporate controls on the vehicle. 
     FIG. 3  illustrates the control arrangements of the present invention in greater detail. ESC  30  may be seen to be essentially a programmable computer comprising a microprocessor  72  and memory  74  communicating over an internal bus. ESC  30  has three input/output (I/O) subsystems including a first CAN transceiver  73  coupled to CAN bus  210 , a second CAN transceiver  76  coupled to CAN bus  204 , and a J1708 transceiver  75  coupled to J1708 bus  220 . The controllers for the major vehicle systems found on most motor vehicles are connected to CAN bus  210 . These include an anti-lock brake system controller  62 , a transmission controller/transmission control module  61 , an engine controller/engine control module  60 , an instrument and switch bank controller  63  and a gauge cluster/auxiliary gauge switch pack  64 . Data transfer among these controllers and with ESC  30  occurs over CAN bus  210 . 
   Specialized controllers installed on the vehicle to adapt it to a specialized purpose, e.g. a power take off application, are coupled to one another and to ESC  30  over the second CAN bus  204 . RRRM  202  is treated as one of these specialized controllers and is connected to bus  204  for communication with any of the controllers connected to CAN bus  210  or to any of the controllers connected to CAN bus  204 . Communications with controllers connected to CAN bus  210  is indirect and must be translated by, or invoke responses from, ESC  30 . RRRM  202  comprises a J1939 CAN transceiver  50 , a CAN controller  150 , a modulator  151  and a transceiver unit  152 , the last of which is connected to an antenna  240 . RRRM  202  may be programmed to handle any security measures taken with signals between it and remote control unit  200 . On the other hand, signals may be passed to ESC  30  for decoding, or to an onboard controller  340  for a specialized auxiliary system  219 . Where remote control unit  200  is adapted for control of any system which is managed by an on board controller, it is anticipated that such security measures be handled by ESC  30 . Handheld unit  200  has functionality defined by look up tables of code types stored in onboard memory  243 . It maintains a radio link with RRRM  202  over an antenna  242 . Handheld unit  200  may supplement, or duplicate, functions normally carried out through the instrument and switch bank  63 , the gauge cluster  64 , or those for an onboard control unit  18  which is associated with a CAN bus interface  51  and controller  40 . In a typical application control is to be established over an auxiliary system  219 , which in turn has a specialized controller  340  and CAN interface  52 . 
   Electrical power for the diverse systems may be provided by a vehicle electrical power system  45  as shown. 
   The invention provides a controller area network solution allowing remote control over any system coupled to the network. This affords flexibility in that a remotely held controller may be adapted to any system by varying only its software package. In addition the system can be customized. Two way communication capability allows programming to be downloaded from a vehicle to a generic hand held unit or from the hand held unit to the chassis computer (i.e. ESC  30 ). Chassis information may be uploaded from the vehicle to the handheld unit for display. 
   While the invention is shown in only one of its forms, it is not thus limited but is susceptible to various changes and modifications without departing from the spirit and scope of the invention.