Fuel injection electronic control unit injector of diesel engine

Abstract

The invention discloses a fuel injection electronic control unit injector of a diesel engine, comprising a plunger coupled part, a plunger spring, a plunger spring seat, a plunger cushion block, an elastic retainer ring, a rocker cushion block, a fuel injector nut, an electromagnetic valve and a fuel injector. The fuel injector and the electromagnetic valve are installed in the fuel injector nut in an overlapped way from bottom to top and are connected with the plunger coupled part via thread pre-tightening -; the plunger spring, the elastic retainer ring, the rocker cushion block and the plunger cushion block are fixed on the plunger spring seat and are fixedly limited by a locking ball via an opening retainer ring and the plunger coupled part; the fuel injection time of the injector is limited by an electronic control unit to drive a high-speed electromagnetic control valve. By means of the invention, precise and flexible control of the optimal fuel injection quantity, the optimal fuel injection time and the fuel injection pressure can be realized, and the combustion in the engine cylinder can be improved, so as to reduce the harmful emission of the engine, and improve the economy, the dynamic performance and the intelligence of the engine.

Description

technical field [0001] The invention relates to a pump nozzle for a diesel engine, in particular to a fuel injection electronically controlled pump nozzle for a medium-power diesel engine. Background technique [0002] Existing diesel engine fuel injection devices are mechanical synthetic pumps or electronically controlled unit pumps. The mechanical synthetic pump is composed of fuel injection pressure regulating mechanism, fuel injection quantity regulating mechanism, fuel injection time regulating mechanism and injection mechanism. The fuel injector of the electronically controlled unit pump has an independent oil pump, which is simplified in structure, but still retains the high-pressure pipeline. These two types of injection devices have low control precision, poor flexibility, and narrow control range. The road is long, there is pressure loss, the pressure of the fuel injection pump is usually lower than 1500bar, and pressure fluctuations such as residual pressure and...

AI Technical Summary

Problems solved by technology

These two injection devices have low control accuracy, poor flexibility, and narrow control range. The road is long, there is pressure loss, the pressure of the fuel injection pump is usually lower than 1500bar, and pressure fluctuations such as residual pressure and reflected waves will cause abnormal injection; there are various straight grooves and inclined grooves on the plunger, which increase leakage and reduce strength and stiffness , the pressure at the pump end is difficult to increase above 1300bar

Due to these shortcomings, mechanical synthetic pumps cannot meet Euro III and above emission standards

The electronically controlled unit pump also limits the increase in fuel injection pressure and the reduction of emission standards

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