id0111u0002700

Purpose, Function

Construction

• The engine oil solenoid valve is installed on the right side of the cylinder block.

ac5wzn00004662

• The engine oil solenoid valve has the following parts:

ac9uun00002273

• An auxiliary passage which leads to the oil pan has been equipped to eliminate valve movement resistance due to hydraulic pressure.

ac9uun00003045

Operation

• The hydraulic transmission passage leading to the oil pump is switched based on the duty signal from the PCM to control the hydraulic pressure applied to the oil pump.

ac5uun00003925

• The PCM performs duty-control of a signal to the coil so that the spool valve is in the optimum position according to the engine operation conditions.

ac9uun00002276

During duty drive (during variable oil pump discharge)

• The engine oil solenoid valve is driven based on the duty signal from the PCM and opens/closes the hydraulic transmission passage from the oil gallery.

• When the spool valve moves to the lower side, the oil passage to the oil pan closes and the oil passage to the oil pump from the oil gallery opens. As a result, hydraulic pressure is applied to the oil pump slide.

• Because the oil amount flowing to the oil pump increases as the duty ratio from the PCM heightens and the oil passage to the oil pump from the oil gallery widens, the hydraulic pressure applied to the oil pump increases.

ac5uun00003925

When engine oil solenoid valve is not energized (when oil not supplied to oil pump)

• When the energization to the coil is interrupted due to the signal from the PCM, the valve moves to the position shown in the figure by the spring force.

• Because the oil passage leads to the oil pan from the oil pump opens, the oil pump hydraulic pressure releases into the oil pan. At this time, the oil passage to the oil pump slide closes.

ac5uun00003926