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On-the-go and regular park-to-park shifts in the new RWD power flow

A technology of vehicles and gears, which is applied in the direction of mechanically driven clutches, elements with teeth, transmission control, etc., and can solve problems such as torque transmission disturbances

Active Publication Date: 2016-12-28
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, park shifts can cause torque-train disturbances

Method used

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  • On-the-go and regular park-to-park shifts in the new RWD power flow
  • On-the-go and regular park-to-park shifts in the new RWD power flow
  • On-the-go and regular park-to-park shifts in the new RWD power flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] The driver will try to perform rolling or regular parking shifts of vehicles with automatic or manual transmissions. In the case of driving parking and shifting, the vehicle will be in the neutral position when moving in the forward or reverse direction (that is, traveling). Alternatively, the vehicle may transition from reverse to forward drive gear while still traveling backward. Shifting the vehicle in this manner (for example, from reverse or neutral to a forward drive gear when traveling backwards) can cause torque train disturbances.

[0045] The transmission may include high gain elements, such as dog clutches, which are associated with smaller packaging, reduced spin loss, and improved fuel economy. However, the engagement of the dog clutch is limited by the fact that the slip speed on the dog clutch is approximately zero. Therefore, engagement of the dog clutch during the parking shift may be restricted.

[0046] The transmission control system according to the p...

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PUM

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Abstract

The present invention relates to on-the-go and regular parking shifts in a novel rear wheel drive power flow. A system for controlling a transmission of a vehicle includes an engine control module that generates commands to change the transmission of the vehicle from a reverse drive gear to a forward drive gear when the vehicle is traveling in a forward or reverse direction. The transmission includes a first clutch, a second clutch, a third clutch and a fourth clutch. a transmission control module responding to the command to maintain the first clutch engaged, release the second clutch and the fourth clutch, when the first clutch is in the engaged state and the second clutch and the fourth clutch are released Applying a synchronizer to the third clutch to engage the third clutch without engaging the third clutch, and reapplying the fourth clutch to engage the fourth clutch after the third clutch is engaged.

Description

[0001] Cross references to related applications [0002] This application claims the rights of U.S. Provisional Application No. 61 / 620,300 filed on April 4, 2012. The disclosures of the above applications are all incorporated herein for reference. Technical field [0003] The present disclosure relates to performing a traveling and regular parking shift / garage shift (garage shift). Background technique [0004] The background art description provided here is only used to generally present the background of the present disclosure. The work described by the inventor in this background art section and aspects that were not described as prior art at the filing date are neither explicitly nor implicitly considered prior art that contradicts the present disclosure. [0005] Vehicles with automatic or manual transmissions can perform park shifts. Park shift includes shifting from park or neutral to forward or reverse. In some cases, parking shifts can cause disturbances in the torque tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W30/19B60W10/06B60W10/11
CPCB60W10/06B60W10/11B60W30/18045F16H61/0246F16H2312/08Y10T74/19251F16D23/06F16H63/30
Inventor V.A.尼拉肯坦K.M.杜根
Owner GM GLOBAL TECH OPERATIONS LLC