Is the car oil pump electrically controlled?
The crankshaft drives the oil pump through the chain
Mechanical, with gear pumps and rotary pumps
The external solenoid valve is installed on the oil pump, and the oil pump solenoid valve is used to realize the oil pump two or multistage oil pump pressure, and is in the oil pan, but the position is the external of the engine. Built in solenoid valve installed in the oil pump, usually in the main oil road and oil pump, controlled by ECU, installation position in the cylinder.
