Variable Fuel Pressure Electronic Injection System and Its Engine

Abstract

The invention discloses an electric fuel injection system with variable fuel pressure and its engine, comprising a fuel injector, an oil pressure regulating assembly and a monitoring unit, the monitoring unit is used to monitor the running state of the engine and control the fuel injection and fuel injection of the fuel injector according to the monitoring signal Control the oil pressure adjustment component to adjust the fuel supply pressure of the injector; control the oil pressure adjustment component through the monitoring unit according to the monitoring signal, so as to ensure that the fuel injector can meet the demand of the gasoline engine for a small amount of fuel under the low flow rate corresponding to the low fuel pressure and the accuracy of fuel injection quantity, and under the condition of heavy load and high speed, by increasing the fuel inlet pressure of the injector to make the injection flow meet the requirements of the large fuel demand of the gasoline engine, the engine can run normally and efficiently; to ensure that the EFI system can It satisfies the requirements of the fuel quantity in different working conditions of the engine well, the flow control of the fuel injector is precise, and the structure is simple and the cost is low.

Description

technical field [0001] The invention relates to the field of electronic injection engines, in particular to an electronic injection system with variable fuel pressure and an engine thereof. Background technique [0002] The electronically controlled fuel injection system has been widely used at home and abroad. The system uses the parameter signals detected by various sensors to represent the operating conditions of the engine. After calculation, analysis and comparison by the electronic control unit (ECU), according to various working conditions It is necessary to control the fuel injection quantity in order to ensure that the engine has good power, economy and emission performance; while in the existing intake port injection electronic injection system, a single constant fuel pressure is generally used to ensure that the fuel injection quantity of the injector is the same as that of the injection A linear curve proportional to time. When the engine is under heavy load and ...

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Problems solved by technology

At the same time, the fuel injector has the characteristic of the minimum controllable fuel injection pulse width, so the required fuel injection pulse width is required to be as large as possible at the minimum engine load and minimum speed to ensure that it is greater than the minimum controllable fuel injection pulse width of the fuel injector. The essence of this requirement is that the injection flow rate of the injector is required to be small enough. Therefore, due to the different requirements on the flow rate of the injector in the two extreme working conditions of the gasoline engine, it will be difficult for the injector with a constant flow rate to meet the fuel quantity requirements of gasoline engines with some extreme parameters. , such as a single-cylinder large-displacement high-speed engine

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