Fuel oil supply system for diesel engine

Abstract

The invention provides a fuel oil supply system for a diesel engine. The fuel oil supply system comprises a fuel oil tank, a low-pressure oil pipe, a high-pressure oil pump, a high-pressure oil pipe, a high-pressure common-rail pipe, a medium- and low-pressure common-rail pipe, an electromagnetic switch valve, a double-oil-inlet-channel oil injector, a check valve with a throttle orifice, an ECU and an electronic control wire harness, wherein the fuel oil tank is connected with the high-pressure oil pump through the low-pressure oil pipe; the high-pressure oil pump is connected with the high-pressure common-rail pipe and the medium- and low-pressure common-rail pipe through the high-pressure oil pipe separately; fuel oil is supplied to the high-pressure oil pump from the fuel oil tank through the low-pressure oil pipe, and different pressures are generated by the high-pressure oil pump and supplied to the high-pressure common-rail pipe and the medium- and low-pressure common-rail pipe through the high-pressure oil pipe separately; and the oil injector is provided with two oil inlet channels, the high-pressure common-rail pipe is connected with one oil inlet channel of the oil injector through the electromagnetic switch valve, and the medium- and low-pressure common-rail pipe is connected with the other inlet channel of the oil injector through the check valve with the throttle orifice. The fuel oil supply system provided by the invention is capable of realizing switchover for two pressures in a single duration period of oil injection, and an oil injection speed is correspondingly changed with the pressure switchover.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a fuel supply system for diesel engines. Background technique [0002] With the depletion of petroleum resources and the increasingly stringent emission requirements, reducing fuel consumption and reducing emissions has become the main research direction of new engine technology. In order to achieve full combustion, it is necessary to improve the atomization effect of the fuel, and increasing the injection pressure becomes the main means. With the development of high-pressure common rail technology, the injection pressure has been greatly improved. The high-pressure common rail system launched by BOSCH, DENSO and other companies has an injection pressure above 250MPa. Under such a high injection pressure, the atomization effect of fuel is greatly improved, and simply increasing the injection pressure will cause a waste of engine power, which is not conducive to the reduc...

AI Technical Summary

Problems solved by technology

[0010] 1) The boost ratio is fixed;

[0011] 2) The engine oil is pressurized and the sealing performance is high;

[0015] 2) The dynamic oil return volume is large, and the requirements for the low-pressure oil circuit are high;

[0016] 3) The booster module is built-in, making it difficult to process and manufacture

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