Main and auxiliary integrated non-linear correction injector

Abstract

The invention discloses a main and auxiliary integrated non-linear correction fuel injector, which belongs to the field of engines. Including the main body of the fuel injector, the main body of the fuel injector is provided with a main oil passage and an auxiliary oil passage connected to the oil inlet. The cross-sectional area of ​​the main oil passage is larger than that of the auxiliary oil passage; the main oil passage and the auxiliary oil passage are respectively equipped with The same oil supply control device, the oil supply control device is connected to the electronic control unit, the oil supply control device is provided with an oil supply channel communicating with the oil passage, and the oil supply control device controls the switch of the outlet of the oil passage. Two oil channels can be used to inject fuel at the same time, so that the fuel injector can meet the requirements of a large amount of fuel injection in a short period of time when the two-stroke direct injection engine is running at high speed and heavy load, and can realize nonlinear correction in the working area of ​​the fuel injector. It solves the problem that the injector does not inject fuel and the fuel injection volume cannot be accurately controlled when the fuel injection pulse width is small, and improves the fuel economy and power performance of the engine.

Description

technical field [0001] The invention relates to an engine fuel injector, in particular to a main and auxiliary integrated non-linear correction fuel injector, which belongs to the field of engines. Background technique [0002] At present, with the country's increasing requirements for internal combustion engine emissions, improving fuel economy and improving emissions under the premise of ensuring engine power has become one of the cores of engine research, which puts higher demands on the control accuracy of injectors. requirements. [0003] Solenoid valve injectors in the prior art are mainly single-channel injectors. In general, the flow characteristics of electronically controlled injectors are considered to be linear, so they are used as linear actuators. In the case of a small fuel injection pulse width, there is a non-linear zone. This nonlinear zone includes: 1. Ineffective injection stage, that is, the stage when the fuel injection pulse width is too small and th...

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Problems solved by technology

In general, the flow characteristics of electronically controlled injectors are considered to be linear, so they are used as linear actuators. In the case of a small fuel injection pulse width, there is a non-linear zone. This nonlinear zone includes: 1. Ineffective injection stage, that is, the stage when the fuel injection pulse width is too small and the needle valve cannot be opened. In this stage, fuel cannot be injected. ;2. Transition stage, that is, the stage where the needle valve can be opened but not stable enough to open, coupled with the instability of fuel flow, the injection characteristics of this stage are nonlinear

Ignoring this area will lead to a large error between the fuel injection volume and the design value of the electronically controlled fuel injection at small pulse widths, especially in the idle speed and light load conditions of small bore engines.

In addition, the engine needs a large amount of fuel injection under high-speed and heavy-load conditions. Since the working cycle of the direct-injection two-stroke engine is extremely short, it is necessary to avoid exhaust loss as much as possible and realize the exhaust port under the condition that the exhaust port is completely closed. Accurate injection of a large amount of fuel, the injection time is greatly limited, so it is necessary to require the injector to complete the injection of a large amount of fuel in a short time (milliseconds)

If an injector with a larger flow rate is selected to meet such conditions, it will cause the injector to work in the nonlinear area when the injection pulse width is small; on the contrary, if the injector is selected to avoid the nonlinear area Injectors with a small flow rate cannot meet the short-term and large-volume demand for high-speed and heavy-load conditions

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