Answer: (1) Start. The motor starts, the main engine starts to run, and the small hole on the valve core of the intake valve closes to let in air. The compressed oil and gas enter the oil and gas tank, and the system pressure gradually rises.
(2) Loading. The motor star-delta conversion, the control system (pressure switch) will compare the actual system pressure with the set pressure. When the system pressure is lower than the lower limit pressure set by the pressure switch, the pressure switch will activate the loading solenoid valve (three-way solenoid valve) to energize the three-way solenoid valve and open it, supplying air to the intake valve servo cylinder to push the control cylinder to open the butterfly valve, and the intake valve is fully opened to inhale air; the pressure through the solenoid valve simultaneously closes the discharge valve, the machine is no longer emptied, and the pressure in the tank continues to rise until air is supplied to the outside.
(3) Unloading. When the pressure rises to the upper limit pressure of the differential pressure switch, the differential pressure switch sends an electrical signal to the three-way solenoid valve, and the solenoid valve closes to stop supplying air to the intake valve servo cylinder. If the control cylinder is not under pressure, the butterfly valve closes to maintain the small hole intake. At this time, the check valve controlled by the counterweight can be closed quickly and tightly in time, and the relief valve opens to release the pressure in the oil and gas tank to the basic oil pressure. The air compressor is in no-load operation. After the loading solenoid valve loses power for 20 minutes continuously, the system enters the idle vehicle too long parking state.
(4) Capacity adjustment. In order to reduce the number of empty weight loads of the air compressor during the loading process of the air compressor, an inverse proportional valve is installed. When the unit pressure reaches the upper limit of the pressure switch, the inverse proportional valve acts in advance to reduce the air supply to the servo cylinder, and the thrust of the valve stem of the intake valve servo cylinder is reduced. Under the action of the spring force, the valve stem retracts. When the spring force is balanced with the gas thrust of the cylinder, the valve stem is in a half-open state, and the intake volume is reduced to achieve capacity adjustment of the air compressor.
(5) Shutdown. The shutdown signal comes from the vehicle being idle for too long or the system pressure being at the upper limit for a long time. The motor stops, the main engine stops rotating and no longer inhales air. The internal check valve of the intake valve closes quickly to ensure that there is no oil spitting during shutdown, and the discharge valve continues to vent to the external atmospheric pressure.
