Line Pressure Control

LINE PRESSURE CONTROL

Operation
The oil pump is driven by the engine. The pressure of oil discharged from the oil pump increases in response to engine speed. It is directed to point (A) of the pressure regulator valve so that the valve moves down. At the same time, it is applied to the kickdown modifier valve which regulates kickdown modifier pressure. Kickdown modifier pressure is then directed to the throttle valve which regulates throttle pressure. Throttle pressure is then directed to the pressure modifier valve which regulates pressure-modifier pressure. The pressure-modifier pressure is used as a signal pressure to the plug of the pressure regulator valve.




- The detent valve acts on the throttle valve via spring (A) in relation to the throttle (opening) position. As the accelerator pedal is depressed, the spring also pushes the throttle valve.
- When throttle (opening) position is greater than 7/8 of full throttle, the detent valve directly attempts to push the throttle valve. At this point, throttle pressure control does not occur so that only kickdown modifier pressure is directed to each valve.