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Motion protection in neutral state of automatic transmission

A technology of transmission and neutral gear, which is applied in the direction of automatic starting device, brake, registration/indicating the operation of the vehicle, etc., and can solve the problems of non-operation and so on

Active Publication Date: 2021-02-05
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sometimes this logic may not work when the transmission is in neutral or park

Method used

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  • Motion protection in neutral state of automatic transmission
  • Motion protection in neutral state of automatic transmission

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Embodiment Construction

[0029] As required, specific embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

[0030] Unintended movement of the vehicle may occur if the park pawl is not engaged with the park gear or abnormal clutch drag occurs. Clutch drag is the phenomenon in which the clutch discs do not disengage completely, causing the vehicle to move while in neutral or park. Failure of the park-by-wire mechanism or a damaged gear in the transmission can also cause unintended vehicle mo...

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Abstract

The present disclosure relates to neutral state motion protection for automatic transmissions. A controller is configured to actuate a vehicle holding mechanism to stop the vehicle in response to a speed of the vehicle exceeding an allowable speed based on a measured grade while the vehicle is running and in neutral or park.

Description

technical field [0001] The present disclosure relates to the control and operation of automatic transmissions. Background technique [0002] Automatic transmissions typically include logic for determining whether the vehicle is moving and whether that movement is appropriate. Sometimes this logic may not operate when the transmission is in neutral or park. Contents of the invention [0003] According to one embodiment of the present disclosure, there is provided a controller configured to, in response to a speed of the vehicle exceeding an allowable speed based on a measured gradient when the vehicle is running and the shift lever is in neutral or park , drive the vehicle holding mechanism to stop the vehicle. [0004] The actuating the vehicle holding mechanism may include causing a tie-up condition of the transmission. [0005] Inducing the bound state of the transmission includes engaging at least two clutches such that movement of an output shaft of the transmission...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H59/44F16H59/66F16H59/68F16H63/34F16H63/48
CPCF16H59/44F16H59/68F16H63/3425F16H63/3458F16H63/48F16H2059/663F16H61/12F16H2061/1224B60T17/12F16H2312/04G07C5/0825B60T7/12B60T8/245B60T8/58B60T13/741B60T2210/20F16H61/0204F16H2059/443F16H2059/746
Inventor 肯尼斯·保罗·沃兹尼亚克
Owner FORD GLOBAL TECH LLC