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Optimization of Driving Force Distribution Control in All-Wheel Drive Based on Wheel Rotation Speed Difference Between Front and Rear

Article of Honda R&D Technical Review Vol.26 No.1

Summary

Electronically controlled all-wheel drive (AWD) systems that are built on a front-wheel drive base can control spinning of the front wheels by increasing the amount of driving force distributed to the rear wheels according to the speed difference generated between the front and rear wheels. On the other hand, the turning characteristics of the wheels change with the amount of driving force distributed. When the magnitude of this change is large, vehicle controllability may be degraded. Driving force distribution therefore needs to take into account the effects during turns that involve a greater wheel rotation speed difference between front and rear.
A spin suppression control system was therefore created that performs theoretical calculations of front and rear wheel rotation speed differences that occur due to turns and tire radius variations, and that takes those values as the target values for the system. The factors that cause front and rear wheel rotation speed differences are divided between front wheel spin and all others, and it was confirmed that this would enable convergence only on front and rear wheel rotation speed differences that are due to front wheel spin.

Reference

(1) Abe, M.: Jidosha no Undo to Seigyo, SANKAIDO PUBLISHING Co., Ltd., p. 5-47, p. 179-187 (2003) (in Japanese)
(2) Sawase, K., Ushiroda, Y., Miura, T.: Left-Right Torque Vectoring Technology as the Core of Super All Wheel Control (S-AWC), Mitsubishi Motors Technical Review, No. 18, p. 18-24 (2006) (in Japanese)
(3) Sawase, K., Ushiroda, Y.: Improvement of Vehicle Dynamics by Right-and-Left Torque Vectoring System in Various Drivetrains, Mitsubishi Motors Technical Review, No. 20, p. 16-22 (2008) (in Japanese)
(4) Kunii, R., Iwazaki, A., Atsumi, Y., Mori, A.: Development of SH-AWD (Super Handling-All Wheel Drive) System, Honda R&D Technical Review, Vol. 16, No. 2, p. 9-16
(5) Suzuki, H., Ohba, M., Yamamoto, T., Takuno, H.: Development of New Electronic Controlled 4WD system for passenger cars, JSAE Annual Congress Proceedings, No. 75-98, p. 1-4 (1998) (in Japanese)
(6) JP, 4-103433, A (1992)
(7) Gotou, A., Kusukawa, H., Fukunaga, I., Mizuya, S., Iida, N., Fukuda, Y.: Development of New Electronic Controlled 4WD System Based on FF, JSAE Annual Congress Proceedings, No. 84-01, p. 18-21 (2001) (in Japanese)
(8) Mori, T., Kume, A., Fujikawa, M., Mizobe, T., Sawa, K., Shimada, K., Kawano, H., Fumoto, H.: Drivetrain of ATENZA, Mazda Technical Review, No. 20, p. 75-85 (2002) (in Japanese)
(9) Adachi, T., Murase, K., Yoshioka, T., Eki, H., Tsuyama, T.: Development of Hardware-In-the-Loop Simulator (HILS) for Dynamic Stability Control (DSC) - Development of the Vehicle Model -, JSAE Annual Congress Proceedings, No. 5-00, p. 13-16 (2000) (in Japanese)

Author (organization or company)

Shoichi OHYAGI(Automobile R&D Center)、Takayuki SEKI(Automobile R&D Center)

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