Engine Mount: Description and Operation

System Description:

PURPOSE
This computer controlled system functions at the rear engine mount to reduce vibration at idle without affecting normal running rpm.

COMPONENTS
Systems consists of a control unit, solenoid valve, and mount main body with vacuum diaphragm.

Hydraulic Fluid Flow:

OPERATION
Control unit monitors engine rpm and only signals solenoid valve to open at idle. When solenoid valve opens, vacuum directed to the actuator turns rotor valve in mount main body by 80 degrees. Rotor valve is located between upper hydraulic chamber A and lower chamber B in mount main body. It functions to vary quantity of fluid flowing between chambers. When rotor valve is open at idle, most hydraulic fluid from chamber A flows through passage 1 to chamber B. A small quantity flows through passage 2 (bypass hole). When valve is closed above idle, a limited amount of fluid flows only through passage 2.