METHOD AND DEVICE FOR CONTROLLING SPECIFIC FUNCTIONS WITHIN A LOAD-CARRYING VEHICLE UNDER DUMPING AND/OR LOADING THE LOAD-CARRYING PLATFORM OF THE VEHICLE

Abstract: The invention relates to a device for controlling specific functions of a load-carrying vehicle when dumping and/or loading the load-carrying platform of the vehicle. The device comprises a manoeuvring organ (1) which is arranged in the cabin of the load-carrying vehicle for hand manoeuvring by the driver. The manoeuvring organ (1) is coupled to at least one of the brakes (3) of the load-carrying vehicle and to the gear box (4) of the load-carrying vehicles so that it when activated may activate the brake and bring about a neutral position in the gear box.

Description: METHOD AND DEVICE FOR CONTROLLING SPECIFIC FUNCTIONS WITHIN A LOAD-CARRYING VEHICLE UNDER DUMPING AND/OR LOADING THE LOAD-CARRYING PLATFORM OF THE VEHICLE. TECHNICAL FIELD OF THE INVENTION The present invention relates to a device for controlling specific functions of a load-carrying vehicle when dumping and/or loading the load-carrying platform of the vehicle. The load-carrying vehicle is preferably a construction machine. The invention will in the following be described in the context of a waist controlled dumper. This is to be seen as a preferred, but in no way limiting application of the invention. The invention can, for example, also be used in a truck. The invention also relates to a method for said control. BACKGROUND ART When dumping the load-carrying platform of a waist controlled dumper, also known as a basket, according to previous technology a number of operations are necessary on the part of the driver of the vehicle. These operations will be described below. The vehicle is backed up against an intended dumping position, and the platform is tilted, allowing the driver to see the ground below and behind the platform. The position of the platform is controlled by means of a tilting lever arranged in the cabin. The tilting lever is usually arranged to the right of the driver, for manoeuvring with his right hand. When the vehicle has reached the intended dumping position, the gas pedal is released, and instead the brake pedal is activated. Using the left hand, a gear lever coupled to the gear box is brought to the neutral position. During the dumping, the brakes are either activated by means of the brake pedal, or the parking brake of the vehicle is utilized. Following the dumping and the return of the platform to the initial position, a gear is engaged, the activated brake is released and the vehicle is driven away. Loading of a waist controlled dumper according to previous technology can for example be done in the following manner. The dumper is backed up against an intended loading position, and is braked. The brake is then kept activated, and/or the parking brake is activated, and the gear box is brought to the neutral position. When the platform has been loaded, a gear is engaged and the vehicle is driven away. In many cases, especially when loading the dumper from behind, the brakes are subjected to large forces. The parking brake is usually too weak to withstand these forces, leading to the driver instead utilizing the brakes of the vehicle. Especially when loading during longer times, this is tiresome for the driver since he must keep the brake pedal pressed down. Due to the large tractive forces obtained at least in larger models of waist controlled dumpers, there is a risk that, when utilizing the parking brake, the driver, especially after loading, will forget to release the parking brake. This will lead to wear, and in some cases to a breakdown of the parking brake. SUMMARY OF THE INVENTION A purpose of the invention is to obtain a device which simplifies and facilitates the manoeuvring of a load-carrying vehicle when dumping and/or loading. In addition, a device is achieved which contributes to improved safety during said manoeuvring relative to previously known technology. Additionally, a device is desired which secures the parking brake function of the vehicle with reduced risk of unnecessary wear. These purposes are obtained by the device comprising a manoeuvring organ which is arranged in the cabin of the load-carrying vehicle for hand manoeuvring by the driver, and by the manoeuvring organ being coupled to at least one of the brakes of the load-carrying vehicle, and to the gear box of the load-carrying vehicle, so that it, when activated, may activate the brake and obtain a neutral position of the gear box. In so doing, two functions are obtained by means of only one hand operation, which considerably simplifies the manoeuvring of the vehicle. In addition, the driver does not need to keep the brake pedal pressed down during loading, which simplifies especially when loading during longer periods of time. According to a preferred embodiment of the invention, the manoeuvring organ is arranged in such a way that it is within reach of the driver while the driver at the same time is manoeuvring the steering wheel and the tilting lever. This means that the driver can bring about the neutral position of the gear box without moving his hands from the steering wheel or the tilting lever respectively, which leads to improved safety. According to another preferred embodiment of the invention, the manoeuvring organ is arranged on a panel in the cabin, in the immediate vicinity of a tilting lever in such a way that it can be reached by the driver while simultaneously manoeuvring the tilting lever with the same hand. This means that the driver can bring the gear box to the neutral position by manoeuvring the manoeuvring organ with the same hand, preferably the right hand, that he is using to manoeuvre the tilting lever with. Thus, the driver does not need to use his left hand to manoeuvre the gear lever, but has his left hand free to control the steering wheel of the vehicle. The device suitably comprises a control unit to which the manoeuvring organ, the gear box and said brakes are coupled, for controlling the activation of said brakes and bringing the gear box to the neutral position when activating the manoeuvring organ respectively. The control unit is also arranged to release said brakes, and to admit the choice of a gear in the gear box with a gear lever when deactivating the manoeuvring organ. According to another preferred embodiment of the invention, the device comprises an organ connected to the control unit for detecting a manual movement of a gear lever connected to the gear box. This means that said brakes can be released only after the gear box has been brought to a gear position separate from the neutral position, which means that the transmission is in a tractive position. This reduces the risk that the vehicle will . start to move before the tractive position is reached, which is risky especially when the vehicle is on a slope. According to another preferred embodiment of the invention, the device comprises an organ connected to the control unit for detecting the speed of the vehicle with the purpose of maintaining said brakes in a non-active position and the current gear of the gear box in spite of an activation of the manoeuvring organ when the speed of the vehicle exceeds a predetermined speed. This eliminates the risk that the brakes will be activated when the manoeuvring organ by mistake has been manoeuvred during motion of the vehicle. According to another preferred embodiment of the invention, the device comprises an organ coupled to the control unit for detecting the pressure in said brakes, and the control unit is coupled to the parking brake of the vehicle for activation of it when the brake pressure falls below a certain value. This reduces the risk of an undesired movement of the vehicle during dumping/loading with a faulty brake. An additional purpose of the invention is to obtain a method which simplifies and facilitates the manoeuvring of a load-carrying vehicle when dumping and/or loading. In addition, a method is desired which contributes to improved safety during said manoeuvring relative to previously known technology. Additionally, a method is desired which secures the parking brake function of the vehicle with a reduced risk of unnecessary wear. These purposes are obtained by means of a method for controlling specific functions of a load-carrying vehicle when dumping and/or loading the load- carrying platform of the vehicle, with the detection of a manoeuvring of a hand manoeuvring organ arranged in the cabin of the load-carrying vehicle and by at least one of the brakes of the load-carrying vehicles being activated and the gear box of the load-carrying vehicle being brought to assume a neutral position when activating the hand manoeuvring organ. Other preferred embodiments and advantages of the invention will become apparent from the dependent claims and the following description. BRIEF DESCRIPTION OF THE DRAWINGS The invention will in the following be described in more detail with reference to the embodiments shown in the appended drawings. Fig. 1 shows an instrument panel in the cabin of the vehicle. Fig. 2 schematically illustrates the coupling between the components of the invention in a preferred embodiment. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION In the following the invention will be explained with the aid of Fig. 1 and 2. The invention relates to a device for controlling specific functions of a load- carrying vehicle when dumping and/or loading the load-carrying platform of the vehicle. The device comprises a manoeuvring organ 1 arranged on a pane) 14 in the cabin of the vehicle, said manoeuvring organ being in the form of a button which is intended to be hand manoeuvred by a driver of the vehicle. The word "panel" here refers to an inner wall section of the cabin, more precisely to the instrument panel of the vehicle. The manoeuvring organ 1 is via a control unit 2 coupled to at least one of, and preferably all of, the brakes 3 of the vehicle, and to the gear box 4 of the vehicle. When activating the manoeuvring organ 1 (depressing the button), the brakes 3 are activated and the gear box 4 is brought to its neutral position. The brakes 3 are more precisely activated by means of a brake pressure determined in advance. Preferably, the pressure is activated successively until the predetermined brake pressure has been reached. Said gear box is preferably automatic and connected to a converter. An engaged gear would bring about energy losses in the form of so-called "dragging" in a non-moving vehicle. This means that said neutral position should be obtained in the gear box during dumping or loading respectively. The manoeuvring organ 1 is arranged in the immediate vicinity of the tilting lever 5 of the vehicle in such a way that the driver can manoeuvre the tilting lever 5 and the manoeuvring organ 1 at the same time, and with the same hand. The tilting lever 5 is connected to the load-carrying platform of the vehicle via hydraulic circuits (not shown) with the purpose of raising/lowering it. The tilting lever 5 is according to the preferred embodiment arranged on the right side of the driver so that it may be manoeuvred with the right hand. The manoeuvring organ 1 is arranged to be manoeuvred by the thumb of the driver while the driver has the rest of his hand available for manoeuvring the tilting lever 5. Since the manoeuvring organ 1 is a button, its activation can take place quickly by means of depressing the button, and with a relatively small diversion of attention from controlling the rest of the vehicle and the load-carrying platform, which simplifies the dumping for the driver and contributes to an improved safety. When dumping, the vehicle is backed up against an intended dumping position, and the platform is tilted, which allows the driver to see the ground behind the platform. When the vehicle has reached the intended dumping position, the driver eases up on the gas pedal, and depresses the button 1. During dumping, the brakes 3 will now be activated automatically. After dumping and returning the platform to its initial position, the driver moves the gear lever 6 of the vehicle from its gear position to the neutral position, and then to the intended gear position. The device comprises an organ 12 connected to the control unit 2 for detecting manual movement of the gear lever 6. The organ 12 for detecting the gear lever can, for example, be a breaker. When the gear lever 6 reaches the neutral position, the function of the manoeuvring organ 1 is terminated concerning the positioning of the gear box to the neutral position. When the gear lever has been brought to the intended gear position and the transmission thus is in a tractive position, the function of the manoeuvring organ 1 is terminated concerning the activation of the brakes 3. The device additionally comprises an organ 8 coupled to the control unit 2 for indicating that the manoeuvring organ 1 is activated, and that the brake 3 thus is activated, and that the gear box 4 is in its neutral position. The indication organ 8 is preferably a lamp arranged on the instrument panel. The lamp is lit when the manoeuvring organ 1 is activated, and is shut off when the brakes 3 are released. The device additionally comprises an organ 9 coupled to the control unit 2 for detecting the speed of the vehicle, with the purpose of maintaining said brake 3 in a non-active position and the current gear of the gear box 4, in spite of an activation of the manoeuvring organ 1 when the speed of the vehicle exceeds a predetermined speed. This predetermined speed is preferably in the range of 0-7 km/h. The speed sensing organ 9 can, for example, be a conventional speedometer. The device also comprises an organ 10 coupled to the control unit 2 for sensing the pressure in said brake 3. The control unit 2 is coupled to the parking brake 11 of the vehicle for activating it when the brake pressure falls below a predetermined value. In Fig. 1 a control device 13 is illustrated which is coupled to the parking brake 11 for manual control of it. The control unit 2 is also coupled to the engine 7 of the vehicle. The control unit 2 is arranged to activate the parking brake 11 if the engine is turned off or if the engine is stalled with the brakes activated and the gear box is in the neutral position. The control unit 2 is preferably a computer unit and comprises software for controlling said parts and functions of the device. In an alternative to the above described position for the manoeuvring organ 1 , that is next to and in the immediate vicinity of the tilting lever, the manoeuvring organ is arranged directly on the tilting lever. In yet another alternative, the manoeuvring organ is arranged on the steering wheel of the vehicle. The manoeuvring organ 1 can, as an alternative to said button, be a lever or another control means. Another equivalent to the above described embodiment is of course that the manoeuvring organ 1 is arranged in a vehicle, with the instrument panel including, among other things, the tilting lever on the left side of the driver. The manoeuvring organ 1 is also in this case preferably arranged on the left side of the driver in connection to the tilting lever.

Claims: CLAIMS 1. Device for controlling specific functions in a load-carrying vehicle when dumping and/or loading the load-carrying platform of the vehicle, characterized in that the device comprises a manoeuvring organ (1) which is arranged in the cabin of the load-carrying vehicle for hand manoeuvring by the driver, with the manoeuvring organ being coupled to at least one of the brakes (3) of the load-carrying vehicle and to the gear box (4) of the load-carrying vehicles, so that it, when activated, may activate said brakes and achieve a neutral position of the gear box. 2. Device according to claim 1, characterized in that the manoeuvring organ (1) is arranged in such a way that it is within the reach of the driver while the driver simultaneously is manoeuvring the steering wheel and the dumping lever (5) of the vehicle. 3. Device according to claim 1 or 2, characterized in that the manoeuvring organ (1) is arranged on a panel (14) in the cabin, in the immediate vicinity of the dumping lever (5) of the vehicle, in such a way that it is within reach of the driver while simultaneously manoeuvring the dumping lever with the same hand. 4. Device according to any of claims 1-3, c h a r a c t e r i z e d i n that the device comprises a control unit (2) to which the manoeuvring organ (1), the gear box (4), and said brakes (3) are coupled, for controlling the activation of said brakes and bringing the gear load to the initial position respectively, when activating the manoeuvring organ. 5. Device according to claim 4, characterized in that the device comprises an organ (12) connected to the control unit (2) for sensing a manual movement of a gear shift lever (4) connected to the gear box (6). 6. Device according to claim 4 or 5, characterized in that the device comprises an organ (9) connected to the control unit (2) for sensing the speed of the vehicle, with the purpose of maintaining said brakes (3) in a non-active position and the present gear in the gear box (4), despite an activation of the manoeuvring organ (1) when the speed of the vehicle exceeds a predetermined speed. 7. Device according to any of claims 4-6, characterized in that the device comprises an organ (10) coupled to the control unit for sensing the pressure in said brakes (3), and in that the control unit (2) is coupled to the parking brake (11) of the vehicle for its activation when the brake pressure falls below a predetermined value. 8. Device according to any of the previous claims, characterized in that it is intended for a waist controlled dumper. 9. Device according to any of claims 1-8, characterized in that it is intended for a load-carrying vehicle. 10. Device for controlling specific functions of a load-carrying vehicle when dumping and/or loading the load-carrying platform of the vehicle, characterized in that manoeuvring of a hand manoeuvring organ (1) arranged in the cabin of the load-carrying vehicle is detected, and in that at least one of the brakes (3) of the vehicle is activated, and the gear box (4) of the load-carrying vehicle is brought to assume a neutral position when activating the hand manoeuvring organ. 11. Method according to claim 10, characterized in that manual movement of a gear selection lever (6) connected to the gear box (4) from the neutral position to a gear position is detected when the manoeuvring organ (1) is activated, and in that said brakes are then released. 12. Method according to claim 10 or 11, characterized in that the pressure in said brakes (3) is detected, and in that the parking brake (11) of the vehicle is activated when the brake pressure falls below a predetermined value. 13. Method according to any of claims 10-12, characterized in that the parking brake (11) of the vehicle is activated when the engine of the vehicle is turned off or when the engine stalls if the brakes (3) have previously been activated and the gear box (4) has been brought to the neutral position via activation of the manoeuvring organ (1 ).

Inventors: KARLSSON JONAS, KARLSTROM GORAN, SVENSSON GOESTA, KARLSSON, JONAS, KARLSTROM, GORAN, SVENSSON, GOESTA
Applicants: KARLSSON JONAS, KARLSTROM GORAN, SVENSSON GOESTA, VOLVO ARTICULATED HAULERS AB, KARLSSON, JONAS, KARLSTROM, GORAN, SVENSSON, GOESTA
Application year: 2001
Main classification: B60K41
IPC codes: B60K20, B60P1, B60T7, B60W10, F16H59, F16H61