Title: Optimal engine torque management for reducing driveline clunk using time-dependent metamodels

Authors: Zissimos P. Mourelatos; Daniel Wehrwein

Addresses: Mechanical Engineering Department, Oakland University, Rochester MI 48309, USA ' RLM Transmission Calibration, General Motors Corp., Milford Proving Grounds, Milford MI 48380, USA

Abstract: Driveline clunk negatively affects the perceived vehicle quality and must be minimised. This is usually achieved using engine torque management which must be balanced against throttle response. In practice, the engine torque rate of rise is calibrated manually. This paper describes a methodology for calibrating the engine torque to minimise the clunk disturbance, while still meeting throttle response constraints. Using a set of engine torque profiles and the corresponding turbine speed responses, a time-dependent metamodel is created using principal component analysis and kriging. The metamodel predicts the turbine speed response due to any engine torque profile and is used in a subsequent optimisation to minimise a clunk disturbance measure while still meeting the throttle response target. The optimal engine torque profile and corresponding turbine speed were successfully validated experimentally. We reduced the clunk disturbance by 33% while improving the throttle response by 11%.

Keywords: engine torque management; NVH; driveline clunk; optimisation; time-dependent metamodelling; vehicle noise; vehicle vibration; throttle response; principal component analysis; PCA; kriging; turbine speed response.

DOI: 10.1504/IJVD.2014.065715

International Journal of Vehicle Design, 2014 Vol.66 No.3, pp.235 - 257

Available online: 09 Nov 2014 *

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