Interrelated power delivery controls – including engine control – Plural engines – Electric engine
Patent
1994-02-03
1995-07-11
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Plural engines
Electric engine
477 24, 477 27, 180 654, 180287, B60T 832, B60K 4120, B60L 700, B60R 7508
Patent
active
054316073
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a drive and braking arrangement for a motor vehicle having at least one electric motor which drives the motor vehicle in dependence on the setting of an accelerator pedal, a forward/reverse drive direction selector which adjusts the driving direction of rotation of the electric motor or electric motors, means for detecting the driving speed of the motor vehicle, and a friction brake arrangement acting on at least one wheel of the motor vehicle.
2. Description of the Prior Art
Motor vehicles whose wheels are driven by electric motors, which are known, for example, from "VDI-Berichte", No. 878, 1991, pages 611 to 622, can be prevented from rolling backward on inclined roadways by the electric motors by means of depressing the accelerator pedal in a manner similar to conventional motor vehicles with automatic transmissions. Since the electric motors must be able to apply the driving moment preventing the motor vehicle from rolling backward in the stationary state, a comparatively high current passes through the motor which can lead to overheating and destruction of the electric motors.
It is known from DE-A-32 38 196 to prevent motor vehicles with automatic transmission from "creeping" during idling by means of an automatic auxiliary brake. The automatic auxiliary brake has an actuating drive which actuates the brake system of the motor vehicle and is set to a braking position when the driving speed lies below a limiting value close to zero and the brake pedal and accelerator pedal are not actuated. The auxiliary brake is released when actuating the gas pedal and/or brake pedal.
Further, an auxiliary brake for a motor vehicle with a conventional mechanical drive train is known from DE 39 09 907 A1. This auxiliary brake automatically assumes a braking position as soon as the actual rotating direction of the wheel does not correspond to the selected drive gear of the gear shift and is automatically released as soon as the rotating direction of the wheel matches the selected drive gear. This improves comfort as the auxiliary brake is actuated, i.e. applied or released, automatically without any effort on the part of the driver as soon as the motor vehicle is in a parking or driving situation requiring the application or release of the auxiliary brake. For this purpose, the motor vehicle is outfitted with: transmission as a function of the position of the accelerator pedal, and described above.
SUMMARY OF THE INVENTION
In this known vehicle, the actuation of the auxiliary brake does not depend on the position or setting of the accelerator pedal. Special means for protecting the drive system in the event that the vehicle is kept stationary, i.e. via a motor, by the driving moment of the drive system, e.g. on an incline, are not provided, nor are they necessary.
The object of the present invention is to provide a drive and braking arrangement for a motor vehicle driven by electric motors which not only facilitates operation of the motor vehicle when driving up an incline, but also eliminates the risk of damage to the drive arrangement.
Proceeding from the drive and braking arrangement discussed above, this object is met according to the invention in that the friction brake arrangement includes an actuating drive controlling the braking force and in that an electronic control unit sets the actuating drive to a braking position when the accelerator pedal remains in a drive position for longer than a predetermined period of time and at the same time the detected driving speed is zero and/or when the means associated with the control unit detect an actual movement of the motor vehicle in the direction opposite the driving direction selected at the selector.
In a drive and braking arrangement of this type, the motor vehicle is automatically braked in a driving situation which could lead to an overloading of the electric motors. The actuating drive is set in its braking position when the electric motors are stopped by the actuation of
REFERENCES:
patent: 4223775 (1980-09-01), Lloyd
patent: 4446950 (1984-05-01), Wise et al.
patent: 5351781 (1994-10-01), Pritchard et al.
Alder Uwe
Drexl Hans-Jurgen
Lutz Dieter
Nagler Franz
Ochs Martin
Jensen Nathan O.
Mannesmann Aktiengesellschaft
Marmor Charles A.
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