Hydraulic control device for automatic transmission

摘要

A hydraulic control device for an automatic transmission, the hydraulic control device includes: a throttle valve, a primary regulator valve and a failure circuit that includes a first solenoid valve that is switched when the throttle valve is subjected to a failure in which the throttle valve is unable to output the throttle pressure, and that leads a predetermined hydraulic pressure based on switching of the first solenoid valve to the control oil chamber of the primary regulator valve.

主权项

1. A hydraulic control device for an automatic transmission, the hydraulic control device comprising:
a throttle valve that includes an input port to which a source pressure is input, an output port, and a discharge port, and that outputs a throttle pressure regulated in accordance with torque input to the automatic transmission from the output port; a primary regulator valve that includes a control oil chamber that communicates with the output port of the throttle valve, a pressure regulation port that communicates with a line pressure oil passage that extends from an oil pump, and a feedback pressure port to which a feedback pressure from the line pressure oil passage is supplied, and that regulates a hydraulic pressure at the pressure regulation port to a line pressure with a hydraulic pressure in the control oil chamber and an urging force of a spring acting on one end of a spool and with the feedback pressure from the feedback pressure port acting on the other end of the spool; and a failure circuit that includes a first solenoid valve that is switched when the throttle valve is subjected to a failure in which the throttle valve is unable to output the throttle pressure, and that leads a predetermined hydraulic pressure based on switching of the first solenoid valve to the control oil chamber of the primary regulator valve.