A hydraulic control system for controlling the engagement pressure of a wet multiplate clutch by means of a proportional pressure reducing valve has been developed for use with electronically controlled torque split 4WD. This system provides real-time control of the torque split to the front and rear wheels, enabling the vehicle to display excellent cornering performance. This paper describes the hydraulic system for 4WD vehicle use and the solutions to various problems encountered in applying a proportional pressure reducing valve to a production vehicle. The results of dynamic simulations and experiments are presented to show how the hydraulic system provides good response and stability over the entire range of oil temperatures and to illustrate how other conditions related to hydraulic pulsation, hysteresis and inner oil leakage have been optimized.
Development of a high respons proportional hydraulic control system for new, electronically controlled torque split 4WD: Nissan Attesa E-TS
Entwicklung eines hochempfindlichen proportionalen hydraulischen Steuerungssystems für die neue, elektronisch gesteuerte Momentverteilung des Allradfahrzeugs Nissan Atessa E-TS
ISATA, 22nd Int. Symp. on Automotive Technology and Automation ; 2 , May ; 849-856
1990
8 Seiten, 9 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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