Multi-mode electronically controlled unit pump

Abstract

The invention aims to provide a multi-mode electronic control unit pump. The pump comprises a double-jumper cam, a roller plunger, a normally closed fuel oil control valve, a fuel oil path reverse valve and double oil outlet valves, wherein a fuel oil control electromagnetic valve is arranged on the upper side of a plunger chamber; the fuel oil path reverse valve is arranged on the upper side of the fuel oil control electromagnetic valve; an oil drainage path is controlled by the fuel oil control electromagnetic valve, so an oil drainage conical valve can be quickly opened and closed to control pressurization and drainage of fuel oil; the flow direction of the fuel oil is controlled by the fuel oil path reverse valve, so the fuel oil path can be quickly switched; multiple oil path configurations can be quickly realized by controlling the fuel oil path reverse valve, and further a function of providing oil through two oil outlet valves alternately or providing oil through the two oil outlet valves at different proportions simultaneously. The working efficiency of the electronic control unit pump can be effectively improved, the engine efficiency is improved, the requirements on oil supply frequency, oil supply pressure and oil supply quantity under different working conditions and different loads of an engine are met, the engine economy and dynamic property are improved, and harmful emission is effectively reduced.

Description

technical field [0001] The invention relates to a fuel injection device, in particular to an engine fuel injection device. Background technique [0002] In order to cope with and improve the increasingly severe environmental pollution and resource shortage, the engine has more stringent requirements on economy and emission, and improving the performance of the engine fuel system is the main way. The development of the engine tends to use electronic control to realize the fuel injection of the engine. For the control of the system, the electronically controlled unit pump technology is an important technical means. The electronically controlled unit pump is a time-controlled fuel injection system that meets engine emission regulations and economic requirements. It has the characteristics of high fuel injection pressure and flexible and adjustable fuel injection timing. In recent years, the development of research on piezoelectric crystals has provided technical support for th...

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Problems solved by technology

[0003] The current high-speed solenoid valve electronically controlled unit pump usually uses a single solenoid valve to control the oil drain circuit. Although this method can improve the control effect on the fuel injection volume and injection law of the fuel injection system to a certain extent, it still exists. The following shortcomings: first, the high-speed switching solenoid valve only has two working states of on and off, and cannot complete multi-mode control; second, the response speed of the solenoid valve is limited, and the control accuracy and working stability are not high; third, the single pump works The efficiency is low, and the camshaft rotates once to complete the fuel supply function to one injector; Fourth, if the cam profile is simply changed to a double peach cam, the fuel supplied by the camshaft rotates once is more than that of one injector. The amount of oil will reduce the working efficiency of the unit pump; Fifth, the traditional electronically controlled unit pump can only complete the control function of a single control valve, which cannot meet the requirements of the engine for the fuel injection process under different working conditions

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