Powertrain lash management

Abstract

The application relates to powertrain lash management, and provides methods and systems are provided for adjusting powertrain torque in a vehicle based on driver intent. Driver intent is inferred based on foot motion inside a foot well monitored via a foot well region sensor and changes in clearance outside the vehicle monitored via a range sensor. By adjusting powertrain torque based on operatorfoot motion and traffic movements outside the vehicle, frequency of lash transitions can be reduced and lash transition initiation can be adjusted based on expected changes in torque demand.

Description

technical field [0001] The present description generally relates to methods and systems for controlling a vehicle engine to manage lash in a vehicle driveline. Background technique [0002] Lash in a vehicle can occur due to slack or clearance-induced spin in vehicle driveline components. During powertrain braking or propulsion, transitions of driveline torque through zero torque can create a clunk or kickback in the driveline, causing driver discomfort. Gently occupying the gap before applying a large amount of torque can mitigate the effect of crossing the gap region to reduce driver discomfort and improve vehicle drivability. Several methods of managing lash within vehicle transmission systems have been investigated. [0003] Yamazaki et al. provide an exemplary method of managing driveline lash in US 8,954,215. Therein, the controller controls torque from a traction motor coupled to the engine and driveline input torque to the wheels during torque reversal from positi...

AI Technical Summary

Problems solved by technology

During powertrain braking or propulsion, driveline torque transitions through zero torque can create clunk or kickback in the driveline, causing driver discomfort

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