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Method and apparatus for controlling vehicle rollback

A vehicle and control system technology, applied in the direction of control devices, control drives, vehicle components, etc., can solve problems such as excessive acceleration

Inactive Publication Date: 2007-08-22
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This helps keep the vehicle on steep inclines, but provides excessive acceleration on flat surfaces

Method used

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  • Method and apparatus for controlling vehicle rollback
  • Method and apparatus for controlling vehicle rollback

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Embodiment Construction

[0021] Referring now to the drawings, which are shown for purposes of illustration and not limitation of the present invention, FIG. 1 illustrates an exemplary powertrain control system for a vehicle constructed in accordance with an embodiment of the present invention.

[0022] Exemplary vehicles include multi-wheeled vehicles for transporting people or goods, and are typically four-wheeled vehicles with a propulsion system driving at least one of the wheels. Exemplary propulsion systems include a hybrid powertrain including an internal combustion engine 30 operatively connected to a hybrid powertrain 40 , the output of which provides drive torque to one or more wheels. An electrical energy storage system 50 including a high voltage battery pack is electrically coupled to hybrid powertrain 40 to provide electrical energy to one or more electric motors contained therein. The internal combustion engine 30 and the hybrid powertrain 40 or the electrical energy storage system 50 a...

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Abstract

A system and method for maintaining a vehicle at a predetermined velocity on a graded surface is provided, which includes a propulsion system to supply motive torque to a vehicle wheel, a vehicle stability sensor, and a control system adapted to receive signal input from the vehicle stability sensor. The control system controls magnitude of the motive torque supplied to the wheel. The propulsion system may include an electric wheel motor powered by an electrical energy storage system, a hybrid powertrain system, and an internal combustion engine and transmission. The vehicle stability sensor determines orientation of the vehicle relative to a horizontal plane, including a longitudinal acceleration sensor and a virtual longitudinal acceleration sensor. The control system receives inputs from a wheel speed sensor, an accelerator pedal sensor, and a brake pedal sensor to control motive torque. Motive torque is controlled to maintain wheel speed sensor at a null output.

Description

technical field [0001] The present invention relates generally to vehicle control systems and, more particularly, to a system and method for maintaining a vehicle at substantially zero speed on an incline. Background technique [0002] When the operator fails to apply the accelerator pedal quickly during vehicle start-off on an incline, the vehicle may roll back. The back-off distance varies with the speed at which the operator transitions from depressing the brake pedal to applying the accelerator pedal. For example, for an exemplary vehicle, allowable back-off distances are shown for various inclines over a period of 2 seconds. [0003] Slope (%) Retreat distance after 2 seconds (mm) 7.2 ＜20 11.6 ＜80 16.0 ＜160 [0004] Vehicles with automatic transmissions typically generate torque via a torque converter that provides forward motion when the brake pedal is released, referred to as creep torque. The e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20B60W20/00B60W30/18
CPCB60W2550/142Y02T10/7258B60W30/18118B60W10/08B60W20/00Y10T477/621B60W2520/105B60W2552/15Y02T10/72B60W20/10B60W10/06B60W10/26
Inventor R·D·博恩斯
Owner GM GLOBAL TECH OPERATIONS LLC
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