ZQYM-6320B crs diesel test bench common rail injector with testing the piezo injector

In order to reduce the emission of diesel engines, common rail system (CRS) has been popularized and applied in the past two decades, and the common rail pressure can reach 160MPa or higher. In the common rail fuel injection system shown in Figure 1, the fuel is sucked into the fuel filter from the fuel tank (1), and then pressurized by the high-pressure fuel supply pump and enters the common rail which acts as a pressure accumulation. The high-pressure fuel flows from the common rail through the high-pressure fuel pipe to the electronically controlled fuel injector of each cylinder; then the fuel injector injects the fuel according to the specified fuel injection law according to the given time and given width of the pulse output by the engine control unit ECU (7A). into the combustion chamber of each cylinder of the diesel engine. The oil returned from the fuel injector of each cylinder flows back into the fuel tank through the oil return pipe and the oil return valve. The sensors used in the common rail fuel injection system include: speed sensor, common rail pressure sensor, fuel temperature sensor, crankshaft (or camshaft) rotation angle sensor, throttle position sensor, etc. The signals collected by these sensors are input to the engine control unit ECU (7A), and after calculation by the ECU, the output signals are sent to the fuel supply pump, the actuators on the common rail and the electronically controlled fuel injector. The performance test bench used for the production debugging, research appraisal or maintenance test of the electric control injector shall be able to simulate the common rail fuel injection system on the engine, and be able to measure the (single) fuel injection quantity and return rate of each cycle of the electronic control injector. oil volume.