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Method for improving a drive-to-park shift

一种驻车、车辆的技术，应用在带有齿的元件、传动装置控制、皮带/链条/齿轮等方向，能够解决不愉快噪音等问题，达到减少噪音、噪音减少的效果

Active Publication Date: 2006-12-13
GENERAL MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this happens, the park tooth collides with one of the output gear teeth, creating a potentially unpleasant noise

Method used

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  • Method for improving a drive-to-park shift
  • Method for improving a drive-to-park shift
  • Method for improving a drive-to-park shift

Examples

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Embodiment Construction

[0015] The present invention provides a method for improving drive to park transitions in an automatic transmission. More specifically, the present invention provides a method for implementing a transition from drive to park such that the park tooth 92 (eg Figure 3a shown) and output gear teeth 96 (such as Figure 3a shown) engage without unpleasant noises. The present invention will hereinafter be described within the context of a typical powertrain 10 (shown in FIG. 1 ), which is used for illustration purposes. However, it should be understood that the teachings of the present invention are equally applicable to many alternative transmissions.

[0016] Referring to FIG. 1 , a vehicle powertrain 10 includes an engine 12 , a transmission 14 , and a torque converter 16 that provides fluid coupling between the engine 12 and a transmission input shaft 18 . A torque converter clutch 19 is selectively engaged under certain conditions to provide a mechanical coupling between the...

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Abstract

According to a preferred embodiment of the present invention, a clutch is applied when the vehicle comes to a stop. The application of this clutch locks the output shaft with energy stored therein. When the shift selector is then moved to the park position, the clutch releases the stored energy in a controlled manner by slipping the clutch plates. The controlled slipping reduces the noise as the park pawl tooth contracts an output gear tooth.

Description

technical field [0001] The present invention provides a method for improving drive to park transitions in an automatic transmission. Background technique [0002] In some cases, a "crash" condition occurs when the vehicle stops while driving. A "crash" condition occurs when a tooth on the output gear aligns with a park pawl tooth. When the shift selector is moved to the park position, latent torsional energy stored in the transmission output shaft is released. This release of energy causes the output gear to begin to accelerate in a rotational manner until the park pawl can engage between the teeth of the adjacent output gear. When this happens, the park tooth collides with one of the output gear teeth, creating a potentially unpleasant noise. Contents of the invention [0003] According to a preferred embodiment of the present invention, by using a dedicated clutch or combination of clutches when the vehicle is stopped, the potentially unpleasant noise produced by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/22
CPCF16H61/0059Y10T477/817F16H2312/16Y10T477/82F16H63/483
Inventor S·F·詹姆斯P·F·麦考利J·K·朗德S·克吕姆珀A·L·米切尔
Owner GENERAL MOTORS CORP
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