Electrically controlled low pressure fuel meter for internal combustion engine

Abstract

The invention provides an electrically controlled low pressure fuel meter for an internal combustion engine. A pressure limiting valve (41) and an electrically controlled meter valve (42) are at least integrated on an externally hung meter shell (40); the pressure limiting valve (41) is used for limiting pressure of fuel fed into a channel of the electrically controlled meter valve (42) to be below preset pressure; a fuel output hole (25) is formed in the electrically controlled meter valve (42); and the electrically controlled meter valve controls the fuel to be quantitatively supplied to a high pressure fuel generation device of the internal combustion machine from the fuel output hole (25) under real-time modulation of a control unit. The electrically controlled low pressure fuel meter disclosed by the invention accurately and quantitatively supplies low pressure fuel with stable pressure to the high pressure fuel generation device of the internal combustion machine, thus improving the hydraulic stability, simplifying the design of the high pressure fuel generation device and improving the manufacturability and the reliability of the high pressure fuel generation device.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an electronically controlled low-pressure fuel gauge for internal combustion engines. Background technique [0002] In the current internal combustion engine technology, there are mainly three types of low-pressure fuel delivery to the fuel high-pressure generating device. One is to draw fuel from the fuel tank by the suction function of the fuel high-pressure generating device itself, such as a single-cylinder diesel engine; the second is to synthesize a mechanical oil delivery pump in the fuel high-pressure generating device, such as a mechanical synthesis pump of a multi-cylinder diesel engine and Electronically controlled unit combined pump, etc.; the third type is to control the supply of low-pressure fuel to the fuel high-pressure generator to meet the storage pressure, such as the multi-cylinder engine with common rail technology, which integrates the r...

AI Technical Summary

Problems solved by technology

Although the first two types realize the active supply of fuel, the supply volume depends entirely on the hydraulic characteristics that change with the speed, and cannot fully meet the accurate requirements for low-pressure fuel delivery volume and delivery pressure under different working conditions.

The third type leads to complex structure and bulky fuel high-pressure generating device, which is limited in installation space and manufacturability. At the same time, the high and low pressure channels are criss-crossed, and its reliability is relatively weak. At the same time, the low-pressure fuel pressure is unstable and the hydraulic stability is poor.

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