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Method for backlash reduction

A clearance, engine speed technology, applied in the control of engine torque to manage the clearance in the powertrain, control the field of powertrain, can solve the problems of vibration, operator discomfort and dissatisfaction

Inactive Publication Date: 2018-08-28
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These impact forces result in tactile and audible noise, vibration and harshness that can cause operator discomfort and dissatisfaction and can negatively impact powertrain and transmission reliability and durability

Method used

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  • Method for backlash reduction
  • Method for backlash reduction
  • Method for backlash reduction

Examples

Experimental program
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Embodiment Construction

[0034] figure 1A powertrain system 10 is shown utilizing a method of reducing backlash according to the principles disclosed below. The powertrain system 10 includes an internal combustion engine 12 and a transmission 14 . The engine 12 is of the reciprocating piston type having one or more reciprocating pistons 15 journalled to a crankshaft 16 . Crankshaft 16 is rotatably coupled to an input of transmission 14 . The output of the transmission 14 is coupled to a pair of drive wheels 20a, 20b through a drive shaft 18, a differential gear set 22, and a set of half shafts 24a, 24b. In another embodiment, the differential gear set 22 is part of the transmission 14 . In one embodiment, the powertrain system 10 provides power to a front wheel drive vehicle having an engine 12 and a transmission 14 in a transverse configuration.

[0035] In another embodiment, figure 1 Not shown, engine 12 engages drive wheels 20a, 20b through a gearbox, clutch, torque converter, or other mechan...

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PUM

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Abstract

A method for controlling a powertrain includes sensing a change in an accelerator pedal position indicative of a driver intended torque request, monitoring the actual engine torque and a change in driver intended torque request to determine if a trigger condition has been met, sensing an engine speed, calculating a virtual engine speed, calculating a difference between the engine speed and the virtual engine speed, determining if the difference in engine speed and virtual engine speed has exceeded a speed difference threshold, iteratively adjusting a torque output of the engine from a first value that is indicative of the driver intended torque request to a second value if the difference in engine speed and virtual engine speed has exceeded the speed difference threshold, comparing adjusted engine torque to expected torque, and applying a correction to an open loop torque control if adjusted torque differs too much from expected torque.

Description

Background technique [0001] The statements in this section merely provide background information related to the present disclosure and may or may not constitute prior art. The present disclosure relates to systems and methods for managing lash in a vehicle powertrain, and more particularly to a control method for controlling engine torque to manage lash in a powertrain. [0002] Driveline backlash, or gear backlash, occurs when the torque transmitted through a transmission or a portion of a transmission is reversed. The backlash is caused by manufacturing tolerances and wear on various components of the powertrain. Play has a perceived negative effect on vehicle drivability, causing problems including muffled, audible noise and / or perceptible jerks. Backlash occurs on powertrains that use a single torque-generative device, such as an internal combustion engine or an electric generator. However, due to the use of multiple torque-generative devices, such as in hybrid-driven p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20
CPCB60L15/20B60L2240/12F02D31/001F02D41/0215F02D41/0225F02D2200/1002F02D2200/101F02D2200/501F02D2200/602F02D2250/18Y02T10/72F02D41/0097F02D41/26
Inventor C·尼凯尔曼S·霍斯特R·施莱默
Owner GM GLOBAL TECH OPERATIONS LLC