Variable flow low pressure fuel oil supplying device and method for pressurizing gasoline direct injection engine

Abstract

The invention relates to a variable flow low pressure fuel oil supplying device for a pressurizing gasoline direct injection engine. A high pressure oil pump is connected with a low pressure oil pump through a low pressure oil supplying pipeline; a pressure and temperature sensor is installed on the low pressure oil supplying pipeline and is in output connection with an engine control unit; the engine control unit is connected with the low pressure oil pump through a fuel oil pump control module. After the engine control unit receives a fuel oil pressure signal, the current flow of a low pressure oil supplying system can be figured out according to current working conditions, then a PWM control parameter is calculated and output according to the actual fuel oil demand of an engine and fuel oil pressure requirements correlating with temperature, a voltage value needing to be provided to the low pressure oil pump is figured out through a oil pump control module, and therefore the low pressure oil pump can be controlled to operate at a corresponding rotation speed. The variable flow low pressure fuel oil supplying device for the pressurizing gasoline direct injection engine can control the oil pumps to operate at a most reasonable rotating speed according to the actual fuel oil demand; accordingly, the fuel oil consumption is reduced, and the noise is reduced.

Description

technical field [0001] The invention belongs to the technical field of a low-pressure fuel oil supply system for a supercharged direct-injection gasoline engine, and mainly relates to a variable-flow low-pressure fuel oil supply method. Background technique [0002] At present, the low-pressure oil supply method commonly used by domestic OEMs is mainly to control the low-pressure oil pump through a relay. This method always provides the maximum amount of fuel to the engine, but the engine does not need so much fuel supply every moment. The fuel flows back into the fuel tank through the overflow valve of the fuel pump. This will significantly increase the electrical load of the vehicle, fuel temperature and fuel evaporation, and increase fuel consumption, which is not conducive to meeting the requirements of the national third-stage fuel limit. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a variable-flow low-p...

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Problems solved by technology

This will significantly increase the vehicle's electrical load, fuel temperature and fuel evaporation, incre

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