Abstract

This paper deals with the problem of active damping of driveline oscillations in order to improve driveability and passenger comfort. Precisely, longitudinal vibrations occur during transient changes in driver demand, and they affect the driveability in a negative way. A robust and efficient controller is proposed, driving the engine in order to actively damp the driveline oscillations. The methodology considered is based on the prediction and compensation of the shaft torque at relevant frequencies. The main advantage and originality of the proposed approach consists in the simplicity of the design and the possibility to adjust the controller, directly on the vehicle, without redesign. This is made possible because the controller parameterization has a "physical" meaning. Three post-design tuning parameters are then available to manage the compromise between performance and robustness. The resulting controller is evaluated on a test car with a SI engine.

Highlights

  • BRAND IMAGE is very important in automotive industry and is built upon the vehicle performance and “driveability”

  • It is interesting to develop a controller that uses the engine as an actuator to damp out the powertrain oscillations

  • Some approaches, dealing with active control of powertrain during transient have already been reported in the literature

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Summary

INTRODUCTION

BRAND IMAGE is very important in automotive industry and is built upon the vehicle performance and “driveability” (the difference between the vehicle handling desired by the driver and the real behavior). It is interesting to develop a controller that uses the engine as an actuator to damp out the powertrain oscillations. The vehicle will tend to feel sluggish The problem with this solution is that the customers will most likely not accept this kind of behavior for a modern vehicle. A second possibility is to actively control the engine torque with respect to the driveline dynamics. The present paper pursues both objectives of performance and easy tuning. It is based on the prediction of the resisting torque in a certain frequency bandwidth (corresponding to the driveline oscillation) and has an original structure. The experimental results obtained from a test car are discussed in section V before concluding

CONTROL PROBLEMS
POWERTRAIN MODEL
CONTROL DESIGN
Design without delay
Design taking the delay into account
ROBUSTNESS ANALYSIS
Time varying sampling of the controller
Results
CONCLUSION
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