Electrically-controlled pump nozzle for injecting fuel of diesel motor

A diesel engine, fuel injection technology, applied in the direction of fuel injection pump, engine control, fuel injection control, etc., can solve the problems of increasing leakage, reducing strength and rigidity, large volume of high-pressure pipeline, etc., to reduce harmful emissions, improve Fuel injection characteristics, improving the effect of in-cylinder combustion

Active Publication Date: 2010-07-21
中曼发动机江苏有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Electrically-controlled pump nozzle for injecting fuel of diesel motor
  • Electrically-controlled pump nozzle for injecting fuel of diesel motor

Examples

Experimental program
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Effect test

Embodiment Construction

[0013] As shown in the figure, the diesel engine fuel injection electronically controlled pump nozzle includes a plunger coupling, a plunger spring, a plunger spring seat, a retaining ring, a rocker pad, a solenoid valve and a fuel injector.

[0014] The plunger pair includes: a pump body 1, a plunger 2 and a limit pin 3. The pump body 1 has a plunger hole, an oil inlet hole and an oil passage. The plunger hole and the lower end of the plunger form a fuel pressure chamber. Three oblique oil inlet holes are evenly distributed radially, starting from the pump nozzle and its upper sealing ring 18, the positioning pin 19 and the cylinder block to form an annular oil storage chamber, leading to the fuel pressure chamber in the pump body, and the oil passage at the bottom of the pressure chamber It communicates with the main oil passage of the control valve components below.

[0015] Solenoid valve is made up of control valve part, electromagnet 8, spool spring 9 and electric cont...

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Abstract

The invention discloses an electrically-controlled pump nozzle for injecting fuel of a diesel motor, comprising plunger matching parts, a plunger spring, a plunger spring seat, an elastic collar, a rocking arm cushion block, fuel injector nuts, an electromagnetic valve and a fuel injector. The fuel injector and the electromagnetic valve are overlapped in fuel injector screw caps from bottom to top and are connected with the plunger matching parts in a pre-tightening way by using screw threads; the plunger spring, the elastic collar and the rocking arm cushion block are fixed on the plunger spring seat and are fixedly limited with the plunger matching parts by using pins, and the fuel-injection time of a pump nozzle is limited through an electronic control unit driving the high-speed electromagnetic control valve. In the invention, the precise and flexible control of the optimal fuel-injection amount, the optimal fuel-injection time and the fuel-injection pressure can be realized, the combustion in a motor cylinder is improved, harmful effluents of the motor are decreased, and the economical efficiency, the dynamic property and the intelligence of the motor are enhanced.

Description

technical field [0001] The invention relates to a 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 refl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M57/02F02M59/46F02D41/40
CPCY02T10/44Y02T10/40
Inventor 陈伯林
Owner 中曼发动机江苏有限公司
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