Piezo diesel injection common rail system

"CRDI" is the abbreviation of Common Rail Direct Injection in English, meaning high-pressure common rail diesel direct injection technology, CRDI technology and SDI (naturally aspirated direct injection diesel engine) technology, TDI (direct injection turbocharged diesel engine) technology Diesel engine technology developed for the German Bosch company. The common rail system is composed of high pressure pump, fuel injection pipe, high pressure accumulator (common rail), fuel injector, electronic control unit, sensor and actuator.

The third-generation common rail system is equipped with piezoelectric in-line injectors. In 2003, the third-generation common rail system came out. The piezoelectric actuator of the piezo common rail system replaced the solenoid valve, so more precise injection control was obtained. The oil return pipe is omitted, and the structure is simpler. The pressure can be adjusted elastically from 20 to 200 MPa. The minimum injection volume can be controlled at 0.5mm3, which reduces smoke and NOX emissions. The maximum injection pressure reaches 180MPa. This set of newly developed piezoelectric in-line injector system makes the range of injection rate curve with pre-injection and post-injection more free.