Fuel high pressure generator for oil supply system with direct jetting of liquefied petroleum gas/petrol in cylinder

Abstract

The high fuel pressure generator for oil supply system of directly jetting liquefied petroleum gas / petrol in cylinder includes fuel tank, fuel filter, fuel conveying pump, the first non-return valve, the second non-return valve, pressure sensor, the third non-return valve, the fourth non-return valve, and fuel pressure unit with cylinder A and cylinder B possessing fuel compressing cylinder position sensors. The present invention can realize high pressure of fuel easily, has no high speed moving part and raised system reliability and is suitable for pressurizing various kinds of liquid and gas fuel. It has two fuel compressing cylinders operating alternately to ensure stable fuel oil pressure without needing pressure accumulator.

Description

technical field [0001] The invention relates to a fuel high-pressure generating device of a liquefied petroleum gas / gasoline in-cylinder direct injection oil supply system. Background technique [0002] More and more direct injection technology in the engine cylinder has been applied to various medium and high-end cars, and it has become a main direction for the development of automobile technology in the future. The fuel high-pressure generating device is a key part of the direct injection fuel supply system in the engine cylinder. The traditional in-cylinder direct injection engine pressure generating device generally adopts the way that the engine drives the plunger type oil pump to press the oil to generate high-pressure fuel. There are many disadvantages in this high-pressure generating device: because the plunger coupling in the plunger oil pump adopts high-precision fit, and they are in a high-speed motion state when the plunger oil pump is working, this requires a go...

AI Technical Summary

Problems solved by technology

The fuel high-pressure generating device is a key part of the direct injection fuel supply system in the engine cylinder. The traditional in-cylinder direct injection engine pressure generating device generally adopts the way that the engine drives the plunger type oil pump to press the oil to generate high-pressure fuel. There are many disadvantages in this high-pressure generating device: because the plunger coupling in the plunger oil pump adopts high-precision fit, and they are in a high-speed motion state when the plunger oil pump is working, this requires a good relationship between the plunger coupling. Lubrication to prevent parts from wear and tear, but for direct injection systems in engine cylinders that use fuels such as gasoline and liquefied petroleum gas, because gasoline, especially liquefied petroleum gas fuels have low viscosity and poor lubricity, if traditional In-cylinder direct-injection engine pressure generating device will inevitably lead to serious consequences of rapid wear of components and device failure. What's more, due to the corrosion of certain fuels, when using a plunger pump to pressurize, it will cause serious consequences due to the corrosion of the fuel. The matching accuracy of the plunger coupling is reduced, so that the traditional in-cylinder direct injection engine pressure generating device has problems such as difficult pressurization and poor sealing performance, which seriously affects the reliability of the system.

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