Correction method and device for injector map curve and engine fuel supply system
A fuel injector and curve technology, which is applied in the field of fuel injectors, can solve the problems that the fuel injector cannot accurately control the fuel injection amount, increase the diesel oil consumption, and reduce the output power, so as to reduce emissions, reduce fuel consumption, improve output power and The effect of fuel efficiency
Active Publication Date: 2015-12-23
WEICHAI POWER CO LTD
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Problems solved by technology
[0005] In order to solve the above problems, the present invention provides a method and device for correcting the MAP curve of the fuel injector and an engine fuel supply system, which are used to solve the problem that the fuel injector in the prior art cannot accurately control the fuel injection quantity, resulting in increased fuel consumption and low output of the diesel engine. Problems with reduced power
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[0037] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0038] In the embodiment of the present invention, after the oil pump is cut off, if the solenoid valve in the fuel injector remains closed, the rail pressure in the common rail pipe remains unchanged or drops slowly; When the valve is opened, the fuel in the injector is sprayed out through the solenoid valve under the action of the air pressure in the common rail pipe, causing the rail pressure in the common rail pipe to drop rapidly. The switching state of the solenoid valve is monitored.
[0039] figure 1 It is a flow chart of the first embodiment of the method for correcting the MAP curve of the fuel injector of the present invention. Such as figure 1 As shown, the method for correcting the MAP curve of the injector in this...
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The invention provides an MAP curve correction method and device for a fuel injector and an engine fuel supply system. The method comprises the following steps: when the rail pressure in a common rail pipe of a fuel injection device is the preset rail pressure, a pulse signal is utilized to drive a solenoid valve of the fuel injector, and the rail pressure in the common rail pipe is real-timely monitored; according to the variation state of the rail pressure in the common rail pipe, the zero-fuel power-up time of the solenoid valve and the fuel injection angular advance of the fuel injector are acquired; according to the zero-fuel power-up time and the fuel injection angular advance of the fuel injector, the MAP curve of the fuel injector under the preset rail pressure is updated. In the embodiment of the invention, the on / off state of the solenoid valve is determined by the variation state of the rail pressure after an oil pump stops oil supply, so that the corrected power-up time of the solenoid valve and the corrected fuel injection angular advance of the fuel injector are efficiently and conveniently acquired, accurate control of the fuel injection amount through the fuel injector is ensured, the output power and the fuel firing efficiency of a diesel engine are improved, the fuel consumption of the diesel engine is lowered, and emission of toxic gases in the running process of the diesel engine is effectively reduced.
Description
technical field [0001] The invention relates to the technical field of fuel injectors, in particular to a method and device for correcting a MAP curve of a fuel injector and an engine fuel supply system. Background technique [0002] At present, internal combustion engines such as diesel engines usually use high-pressure common rail devices to supply oil. Separated so that the rail pressure has nothing to do with the engine speed, so as to effectively overcome the problem that the fuel supply pressure of the diesel engine changes with the engine speed, improve the utilization efficiency of fuel, and reduce the release of toxic gases due to incomplete combustion of fuel quantity. [0003] Among them, the fuel is pressed into the common rail pipe from the oil pump to supply several fuel injectors connected to the common rail pipe for injection. The diesel engine contains two actuators, one actuator is used to generate a certain rail pressure flow metering unit in the common ...
Claims
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IPC IPC(8): F02D41/40
CPCY02T10/40
Inventor 贾楠李大明冯杰王莉莉艾聪
Owner WEICHAI POWER CO LTD