| 摘要 |
PURPOSE: To avoid pressure variation of a variable force solenoid to the largest possible extent by supplying pilot pressure to the variable force solenoid with a non-flow type regulator valve, and generating pressure that can be used by the regulator valve of the automatic control system. CONSTITUTION: When a variable force solenoid 84 is supplied with signal voltage, throttle pressure is generated at the output side of a variable force solenoid valve 82 and supplied to a throttle pressure regulator valve 10. The pressure used by the variable force solenoid valve 82 is generated in a line 70 by a variable force solenoid relief valve 60, and is lower than the regulated output pressure of an engine drive pump 44. The burden of the solenoid 84 is reduced. In this way, it is possible to avoid pressure variation of the variable force solenoid to the largest possible extent. |
