Oil-rail pressure closed-loop control based direct jetting method and system of combustion engine

A technology of oil rail pressure and closed-loop control, which is used in electrical control, charging system, engine control, etc.

Inactive Publication Date: 2012-03-21
朱建希
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly uses a pressure sensor to sense the fuel rail pressure, and then triggers fuel injection according to the sensed pressure during the four strokes of the engine. It only adds an injection step, but still does not solve the problem.

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  • Oil-rail pressure closed-loop control based direct jetting method and system of combustion engine
  • Oil-rail pressure closed-loop control based direct jetting method and system of combustion engine
  • Oil-rail pressure closed-loop control based direct jetting method and system of combustion engine

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings.

[0031] First, refer to figure 1 The structural schematic diagram of the system described in the present invention shown, figure 2 A schematic block diagram of the system according to the present invention is shown, and image 3 The flow chart of pressure control using the present invention is shown to describe the present invention as a whole.

[0032] Such as figure 1 As shown, the gasoline direct injection system based on the closed-loop control of fuel rail pressure is set up corresponding to the hardware structure shown by reference numeral 100 as a whole. It includes an internal combustion engine 110 , a fuel system 120 and a control system 130 , where the fuel system 120 is controlled by the control system 130 to provide fuel including gasoline to the internal combustion engine 110 . By way of example and not limitation...

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Abstract

The invention provides an oil-rail pressure closed-loop control based direct jetting method and a system of a combustion engine, which belong to the field of direct jetting type combustion engine. The system is provided with valves and logic control units corresponding to an existing combustion engine, a pressure sensor and a controller. The oil-rail pressure closed-loop control based direct jetting method includes steps of calculating target pressure of an oil rail on the basis of all relative factors, correcting the target pressure of the oil rail by combining with feedforward correcting calculation, acquiring actual pressure of the oil rail according to specific correct time of oil injection, and comparing the target pressure of the oil rail to the actual pressure of the oil rail so as to obtain fluctuation condition of the pressure and adjusting openness of the valve according to the fluctuation condition of the pressure of the oil rail. The pressure of the oil rail can be kept stable by adjusting and controlling the openness of the valve on the basis of comparison of the target pressure and the actual pressure of the oil rail, and thereby the defect that actual oil injection quantity is affected by higher fluctuation of the pressure of an oil injection loop is eliminated.

Description

technical field [0001] The invention belongs to the field of direct-injection internal combustion engines, and in particular relates to a direct-injection method and system for an internal-combustion engine that regulates the opening of a valve by comparing fluctuations in target fuel rail pressure and actual fuel rail pressure, thereby realizing closed-loop control of fuel rail pressure. Background technique [0002] At present, gasoline direct injection technology directly injects high-pressure fuel into the cylinder through the injector in a short period of time, which can significantly improve the fuel-air mixture, combustion conditions, pumping gas and heat loss of the engine, thereby significantly improving the fuel efficiency and emissions of the engine. It is the development direction of gasoline engine. [0003] However, because the system needs to inject a large amount of fuel into the cylinder in a short period of time, this will lead to large pressure fluctuation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14F02M55/02F02D41/40
Inventor 朱建希易迪华杨晋军焦志锋闵敏
Owner 朱建希
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