Pressure-stabilizing switchable multi-section fuel injection system and method

Abstract

The invention discloses a pressure-stabilizing switchable multi-section fuel injection system and method. The high-pressure oil pump is used for pumping fuel oil in an oil tank into a high-pressure reserved cavity and a high-pressure common rail; the high-pressure common rail is used for providing high-pressure oil to the oil injector; the high-pressure reserved cavity is used for pre-storing high-pressure oil and guiding the high-pressure oil into the oil injector when multi-section injection is needed; the inlet electromagnetic valve is mounted on a public pipeline, communicated with the high-pressure oil pump and the high-pressure common rail, of the high-pressure reserved cavity; the outlet electromagnetic valve is mounted on a public pipeline through which the high-pressure reserved cavity is communicated with the high-pressure common rail and the oil sprayer; the oil injector is used for injecting high-pressure oil; the engine control unit is used for collecting vehicle parameters, determining injection parameters according to the vehicle parameters, controlling opening and closing of the inlet electromagnetic valve and the outlet electromagnetic valve according to the injection parameters, and conducting multi-section fuel injection control. By means of the pressure storage function of the high-pressure reserved cavity, it is guaranteed that the fuel oil injection time is shortened, and the fuel oil combustion efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile engine control, and in particular relates to a voltage-stabilizing switchable multi-stage fuel injection system and method. Background technique [0002] The high-pressure common rail system uses the common rail pipe between the high-pressure fuel pump and the injector to accumulate the fuel output from the high-pressure fuel pump and suppress pressure fluctuations, and then deliver the fuel to each injector through each high-pressure fuel pipe. The action of the solenoid valve on the injector controls the start and termination of the injection, the time when the solenoid valve works determines the injection timing, and the duration of the action and the common rail pressure together determine the injection quantity. [0003] Pre-injection 1 precedes the main injection, and the pre-injection results: the mixture pressure in the cylinder increases slightly; the delay in the main injection combus...

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Problems solved by technology

[0006] Existing technology requires precise and connected control of pre-injection, main injection, and post-injection. At present, in the process of diesel fuel injection, diesel engine fuel injection is divided into pre-injection, main injection, and post-injection, and each section of injection is only used once. And there is no coherence and continuity, and each injection controls the fuel injection according to the power-on time of the normally closed solenoid valve, but as the injection progresses, the pressure of the fuel rail gradually decreases, so the fuel system has high requirements on the rail pressure, but Due to the opening of the normally closed solenoid valve in the high-pressure oil circuit, there will be head loss when the fuel fluid is injected into the cylinder, and the rail pressure will drop during the single injection sequence, resulting in a gap between the actual fuel injection quantity and the expected fuel injection. The duration, can not control the combustion well

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