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Control Parameter Optimization for Reduction of 2nd Order Vibration in Hybrid Drive Mode of SPORT HYBRID i-MMD

Article of Honda R&D Technical Review Vol.26 No.2

Summary

During development of the 2014 model-year Accord Hybrid, for which the SPORT HYBRID i-MMD new model hybrid system was adopted, 2nd-order vibration transmitted to the steering became an issue. This occurred because the vehicle has higher engine net torque than a gasoline engine vehicle, so that there is larger crankshaft revolution 2nd-order fluctuation, which is the source of the vibration. There is concern that using only reduction of engine net torque as the means to lessen crankshaft revolution 2nd-order fluctuation could cause an increase in the brake-specific fuel consumption. Therefore the combustion control parameters, such as ignition timing and valve operation timing, were changed as a way of optimizing crankshaft revolution 2nd-order fluctuation, engine net torque, and brake-specific fuel consumption. These measures achieved the steering vibration target while also determining the optimal point where the amount of engine net torque reduction could be lessened by 5 Nm and 1% of the increase in brake-specific fuel consumption could be recovered.

Reference

(1) Matsumoto, S., Ishikura, M.: The Latest Hybrid Passenger Cars, Journal of Society of Automotive Engineers of Japan, Vol. 61, No. 9, p. 49-54 (2007) (in Japanese)
(2) Yonekawa, A., Watanabe, O., Sekiya, N., Ishikawa, N.: Development of New 2.0 L Gasoline Engine for Accord Hybrid, Honda R&D Technical Review, Vol. 25, No. 2, p. 27-32
(3) Ide, H., Sunaga, Y., Higuchi, N.: Development of SPORT HYBRID i-MMD Control System for 2014 Model Year Accord, Honda R&D Technical Review, Vol. 25, No. 2, p. 33-41
(4) Ochiai, S., Uchibori, K., Hara, K., Ttsurumi, T., Suzuki, M.: Development of a Motor Assist System for a Hybrid Car - INSIGHT, Honda R&D Technical Review, Vol. 12, No. 1, p. 7-14
(5) http://www.honda.co.jp/ACCORD/webcatalog/performance/details01/

Author (organization or company)

Tatsunori TSURUTA(Automobile R&D Center)

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