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Automatic transmission

A technology for automatic transmissions and transmissions, applied in the direction of transmission control, elements with teeth, belts/chains/gears, etc., can solve problems that do not involve positive torque requests, etc., and achieve the effect of improving the shifting feeling

Inactive Publication Date: 2009-08-05
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this document does not address the issue of positive torque requests during foot-upshifts

Method used

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  • Automatic transmission
  • Automatic transmission
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Examples

Experimental program
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Effect test

Embodiment Construction

[0021] Such as figure 1 As shown, a CAN message ("Positive Torque Request Monitored") is sent from the transmission control module (TCM, dashed line) to the engine control module. Within the transmission control module, the following steps are performed: During a foot upshift, an upshift positive torque is requested. The upshift positive torque request is sent both on CAN (constructed with CAN messages) and on the upshift positive torque monitor. The upshift positive torque monitoring device is designed to distinguish between a desired shift situation and an upshift situation in which the positive torque is not expected. If upshift positive torque is desired, the monitored positive torque request is sent to the engine control module.

[0022] If positive torque is not desired, then a positive torque CAN override request is sent to the CAN and a positive torque CAN message to be sent to the engine control module (ECM) is overridden ("no effect"). Also, check CAN message over...

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PUM

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Abstract

The invention concerns an automatic transmission with an engine control module and a process for controlling an automatic transmission. In order to assure secure positive torque requests during lift foot upshifts, an automatic transmission is described which comprises a transmission control module with means for sending an upshift positive torque request on CAN and means for an upshift positive torque supervision preventing the transmission from requesting unexpected positive torque. The means for an upshift positive torque supervision are designed to differentiate upshift conditions under which the positive torque is not expected to occur from shift conditions where it is expected to occur. They allow secure positive torque requests during lift foot upshifts.

Description

technical field [0001] The invention relates to an automatic transmission with an engine control module and a method of controlling the automatic transmission. Background technique [0002] Automatic transmissions expect "positive torque" during upshifts to improve shift feel and responsiveness. However, upshift positive torque is considered a "high risk" (or top-level event) because the feature puts the vehicle at risk of undesired acceleration even though the driver has lifted his foot off the accelerator pedal. [0003] Document JP20000320656A discloses a device and method for controlling a transmission. In order to be able to properly upshift according to the operation mode and to improve drivability by judging whether the transmission is in a conservative or aggressive operation mode and issuing an upshift signal at the selected upshift point according to the judging result, this document proposes that the control device receive Inputs from the driver and signal shift...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02F16H59/40F16H59/42F16H59/70
CPCF16H61/0437F16H2061/1208F16H2061/0496F16H2061/1268F16H2306/42F16H63/502F16H61/12
Inventor 帕斯卡尔·蒂索特文森特·霍尔茨
Owner GM GLOBAL TECH OPERATIONS LLC
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