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Method for starting or stopping a vehicle on a gradient

A technology for vehicles and slopes, applied in the direction of vehicle components, driver input parameters, engine control, etc., can solve the problems of unutilized vehicle acceleration, increased clutch wear, excessive temperature rise, etc.

Active Publication Date: 2009-09-16
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, energy is introduced into the clutch but not utilized for vehicle acceleration
In addition, this excessive energy introduced into the clutch leads to an excessive temperature rise, which leads to increased clutch wear

Method used

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  • Method for starting or stopping a vehicle on a gradient
  • Method for starting or stopping a vehicle on a gradient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] figure 1 The powertrain of the vehicle is schematically shown in . In the powertrain system, a driving machine 10 is connected with a clutch 12 and a transmission 14 , wherein the output shaft of the transmission 14 drives the rear wheels 20 of the motor vehicle through a cardan shaft 16 and a differential 18 .

[0014] In this example, a conventional friction clutch is shown as clutch 12 , the actuating lever of which is actuated by a clutch actuator 22 , for example an electric motor.

[0015] The transmission 14 can be, for example, an automated manual transmission, the shift elements of which can be actuated by a transmission actuator 24 in order to select and shift gears. For this purpose, the transmission actuator 24 includes two electric motors.

[0016] The transmission control device 26 is used to control the clutch actuator 22 and the transmission actuator 24, the input end of the transmission control device is connected with the sensor for detecting the pos...

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PUM

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Abstract

The present invention relates to a method for starting or stopping a vehicle on a gradient. In order to protect the clutch (12) against overheating and therefore against excessive wear during the actuation of at least one brake (48) and simultaneous pressing of the accelerator pedal (44), a torque reduction in the form of a torque reduction request is transmitted to the engine control unit (40) taking into account the position of an accelerator pedal, and a reduced torque is transmitted to the clutch on the basis of said torque reduction request.

Description

technical field [0001] The invention relates to a method for starting or stopping a vehicle on a slope according to the preamble of claim 1 . Background technique [0002] In an automated transmission in which at least one friction clutch is connected, the friction clutch experiences increased loads, especially when starting off on a slope. It is already known that, in order to start off on a slope, the driver has to manually either actuate the service brake or the parking brake in order to prevent the vehicle from rolling backwards. Here, the steeper the slope, the more difficult the starting process. If the driver of such a vehicle delays the start-off process with the clutch partially engaged or the vehicle deliberately stops for a prolonged period on an incline with the clutch slipping, the thermal load on the friction clutch increases. On the other hand, it can also be assumed that the driver uses either the hand brake or also the foot brake on very steep slopes in or...

Claims

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Application Information

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IPC IPC(8): B60W30/18B60W10/02B60W10/06B60W10/18
CPCB60W2540/12B60W2710/0666B60W10/184B60W2510/186B60W10/06B60W30/186B60W30/18118B60W10/02Y10S477/901B60W30/18027
Inventor S·乌丁
Owner SCHAEFFLER TECH AG & CO KG