This study has established an optimum vibration control technique for using a motor connected directly to the engine crankshaft to reduce engine speed variation and engine block roll vibration. It was found that applying motor torque having a rectangular waveform was the most effective in reducing such variation and could get such performance with a small peak torque level. This control can be accomplished by adding a feed-forward procedure for applying such motor torque in synchronization with the crank angle. The proposed control technique involves the application of positive bias torque to the engine and negative bias torque to the motor while keeping the engine power constant. In the case of hybrid electric vehicles, it is essential to suspend operation of the engine at low loads and to generate electric power under high-load operation which causes higher level vibration. The technique developed in this study is thought to be one approach to using a compact motor to obtain a vibration level equal to or lower than of conventional vehicles without sacrificing the excelent fuel economy of hybrid electric vehicles.
A study on the reduction of crankshaft rotational vibration velocity by using a motor-generator
Studie zur Reduzierung der Kurbelwellen-Drehschwingungen unter Verwendung eines Motor-Generators
JSAE Review ; 21 , 3 ; 335-341
2000
7 Seiten, 13 Bilder, 1 Tabelle, 2 Quellen
Article (Journal)
English
A study on the Reduction of Crankshaft Rotational Vibration velocity by using a Motor-Generator
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