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Electrically assisted variable-k control

A factor, control processor technology, applied in transmission control, transmission, fluid transmission, etc., can solve problems such as low efficiency

Inactive Publication Date: 2012-07-04
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the k-factor associated with the torque converter can lead to inefficiencies during launch

Method used

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  • Electrically assisted variable-k control
  • Electrically assisted variable-k control
  • Electrically assisted variable-k control

Examples

Experimental program
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Embodiment Construction

[0012] A vehicle is configured to include a torque converter having a variable effective k-factor. The K factor may be the input speed (eg, revolutions per minute, RPM) at which the torque converter produces a reverse torque of 1 Nm. Torque increases with the square of speed. In one possible embodiment, a vehicle includes a transmission, a motor and an engine. The torque converter is configured to provide motor torque to the transmission based on the k-factor of the motor only when only the motor is providing torque to the transmission. The torque converter is also configured to provide engine torque to the transmission based on the engine-only k-factor when only the engine is providing torque to the transmission. But each time both the electric machine and the engine are providing torque to the transmission, the control processor is configured to mix the electric machine only k-factor and the engine only k-factor and control the torque converter according to the mixed k-fac...

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PUM

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Abstract

The invention relates to electrically assisted variable-k control. A vehicle includes a transmission, a motor configured to provide a motor torque to the transmission, and an engine configured to provide an engine torque to the transmission. A torque converter is operably disposed between the transmission and the motor, the engine, or both. The torque converter is configured to at least partially transfer at least one of the motor torque and the engine torque to the transmission in accordance with a plurality of k-factors. The torque converter includes a clutch configured to at least partially engage to change the effective k-factor applied by the torque converter. A control processor is configured to blend the plurality of k-factors and at least partially engage the clutch based on the blended k-factor.

Description

technical field [0001] The present invention relates to electrically assisted variable k-factor control in a vehicle. Background technique [0002] Passenger and commercial vehicles include a transmission that receives torque from an electric machine, or an engine, or both. In an automatic transmission, a torque converter transfers engine or electric motor torque to the transmission. The torque converter provides an initial amount of slip that gradually decreases over time. This operating characteristic of the torque converter is referred to as the k-factor of the torque converter. The k-factor affects how the vehicle feels to the driver. That is, the amount of time it takes for the vehicle to accelerate in response to a driver depressing the accelerator pedal is determined by the k-factor of the torque converter. However, the k-factor associated with a torque converter can lead to inefficiencies during launch. Contents of the invention [0003] A vehicle includes: a ...

Claims

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Application Information

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IPC IPC(8): F16H61/14
CPCF16H61/143Y02T10/6286F16H59/18F16H2059/467F16H59/44F16H2061/145
Inventor S.H.斯瓦勒斯H.杨A.路得特克A.W.菲利普斯J.M.马圭尔
Owner GM GLOBAL TECH OPERATIONS LLC