Title:
【発明の名称】4輪駆動車のトランスファクラッチ制御装置
Document Type and Number:
Japanese Patent JP2688818
Kind Code:
B2
Abstract:
A control system for a four-wheel drive vehicle having a continuously variable transmission, and a fluid operated transfer clutch for transmitting the output of the transmission to auxiliary drive wheels is disclosed. A transfer control valve is provided for changing the amount of oil supplied to the transfer clutch to selectively engage the clutch, and a three-way solenoid operated control valve is provided for controlling oil supplied to the transfer control. The solenoid operated control valve has a first port communicated with the pump, a second port communicating with the transfer control valve, a drain port, and a valve body selectively closing the first port and the drain port. The solenoid operated control valve is operated by a pulse train whose duty ratio is controlled to reduce the amount of oil drained from the drain port during the changing of the amount of oil supplied to the transfer clutch on engagement and disengagement of the clutch.
Inventors:
Yasuto Sakai
Application Number:
JP5551588A
Publication Date:
December 10, 1997
Filing Date:
March 09, 1988
Export Citation:
Assignee:
Fuji Heavy Industries Ltd.
International Classes:
B60K17/348; B60K23/08; (IPC1-7): B60K17/348
Domestic Patent References:
| JP60203532A |
Attorney, Agent or Firm:
Nobuhiro Kobashi (1 outside)