High-pressure common-rail fuel injection pressure control method and system

A technology of fuel injection pressure and high pressure common rail, which is applied in the directions of fuel injection control, electrical control, engine control, etc., can solve the problems of low pumping efficiency and achieve the goal of improving independent design, energy conversion efficiency, and fuel economy Effect

Active Publication Date: 2016-03-23
苏州达菲特过滤技术股份有限公司
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AI Technical Summary

Problems solved by technology

This results in fuel supply at low engine loads comparable to high load fuel supply, higher oil return, and even lower pump efficiency than mechanical oil transfer pump systems

Method used

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  • High-pressure common-rail fuel injection pressure control method and system
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  • High-pressure common-rail fuel injection pressure control method and system

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Embodiment Construction

[0042]The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and the structural, method, or functional transformations made by those of ordinary skill in the art according to these embodiments are all included within the protection scope of the present invention.

[0043] like figure 2 As shown, it is a schematic diagram of the electronically controlled high-pressure common rail fuel injection pressure control fuel circuit according to the present invention, and the fuel supply volume of the fuel pump is exactly equal to the demand flow of the common rail system. The invention controls the fuel supply of the electric fuel pump to adjust the common rail injection pressure, avoids unnecessary load on the engine, improves the energy conversion efficiency of the engine, and conforms to the development trend of intelligent, integrated and m...

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Abstract

The invention discloses a high-pressure common-rail fuel injection pressure control method and system. According to the method, an electric fuel delivery pump driven by a DC motor is taken as an actuating element and the high-pressure common-rail fuel injection pressure is adjusted by adjusting the low-pressure fuel output quantity. The method is characterized in that a set fuel injection pressure value and a target driving PWM signal value of the electric fuel delivery pump are calculated by gathering the operating parameters of an engine, and a PWM single duty ratio control logic changes along with switching of the operating condition modes of the engine. According to the invention, the common-rail injection pressure is adjusted by controlling the fuel supply quantity of the electric fuel delivery pump, which avoids unnecessary load of the engine, increases the energy conversion efficiency of the engine and fits the intellectualization, integration and modularization development trend of automobile actuators. The invention changes traditional common-rail fuel injection pressure control and calibration modes, reduces technological dependence on high-pressure common-rail fuel injection system suppliers and contributes to enhancing the independent design and development abilities of engine and diesel vehicle manufacturers.

Description

technical field [0001] The invention relates to high-pressure common rail fuel injection pressure control, in particular to a method and system for realizing high-pressure common rail fuel injection pressure control by adjusting the fuel supply amount of a low-pressure fuel system. Background technique [0002] The electronically controlled high pressure common rail system has become the mainstream technology for energy saving and emission reduction of diesel vehicles due to its high fuel injection pressure, which can be adjusted independently of the engine speed and can achieve precise control of flexible fuel injection. The high pressure common rail system implements the control of the rail pressure and the fuel injection pressure by adjusting the oil flow rate in the high pressure rail. The actuators are the flow control valve and the electronic control unit. The fuel transfer pump is responsible for transmitting the oil volume to the high-pressure circuit to maintain the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/04F02D41/38
CPCF02D41/04F02D41/3082F02D41/3827F02D41/3854F02D2200/101F02D2250/31
Inventor 伍茜陈卫王玉
Owner 苏州达菲特过滤技术股份有限公司
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