VF-173 Isuzu Solenoid Valve

Working principle diagram of gearbox Solenoid valve: Simply put, Solenoid Valve is like a faucet, different openings, different hydraulic oil flow through, different pressures generated. The solenoid valve is controlled by the transmission electronic control module TCU, basically the neutral and in-gear pressure is a constant value, but the opening of the solenoid valve is adjusted during the shifting process to improve the smoothness of the shift.

Different solenoid valves control different clutches or brakes and function in different gears. Each gear is the effect of being controlled by one or several solenoid valves.

The working principle and structure of solenoid valves generally use two-position three-way valves, and some use three-way valves. The gearbox solenoid valve uses the reversing function of the two-position three-way solenoid valve to make the oil pressure of the brake sub-pump continue to reciprocate around the pressurization, pressure holding, and pressure relief, which can reciprocate thousands of times per second, so that the wheels are in a critical state of sliding and locking, so that the wheels have rich adhesion, so as not to let the car lose control when braking.