A fuel injection control method

Abstract

The invention discloses a fuel injection control method. The control method specifically includes: pre-installing a rail pressure fuel quantity correction MAP map and a main injection power-on time MAP map in an electronic control unit ECU, and placing the rail pressure fuel quantity correction MAP map in advance. There is a main spray power-on time correction value calibrated according to the pre-spray set fuel volume and rail pressure; when the main spray is performed, the main spray set volume and rail pressure of the current working condition are used from the main spray power-on time MAP diagram Find the scheduled power-on time of the main injection; at the same time, find the correction value of the power-on time of the main spray through the pre-spray set oil volume of the current working condition, rail pressure and slave rail pressure oil volume correction MAP; and use the correction value of the power-on time of the main spray Correct the scheduled main injection power-on time to obtain the actual main injection power-on time of the current working condition, so that the actual main injection quantity of the current working condition is within the preset range. This paper considers the influence of pre-injection on the main injection fuel injection quantity, and keeps the actual main injection fuel quantity roughly equal to the main injection predetermined fuel quantity by correcting the power-on time of the main injection.

Description

technical field [0001] The invention relates to the technical field of fuel injection control, in particular to a fuel injection control method. Background technique [0002] At present, engines have been widely used in various economic fields, especially diesel engines (hereinafter referred to as diesel engines). There are a large number of medium-sized diesel engines, marine diesel engines and construction machinery diesel engines in my country. [0003] In the prior art, diesel engine systems are widely equipped with an electronically controlled common rail system, and the electronically controlled common rail system makes multiple injection the mainstream method of fuel injection control. That is, before the single injection in the traditional sense (which becomes the main injection in the case of multiple injections), one or more injections with a small amount of oil are added, which is called pre-injection. Pre-injection is used to optimize cold starts or reduce engin...

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Problems solved by technology

[0005] For diesel engine products with the above-mentioned fuel control method, customers generally report that the actual total fuel injection volume is greater than the preset total fuel injection volume, which greatly reduces the power performance and economic performance of the diesel engine, seriously causing the image of the product to be greatly reduced in the minds of customers. , damage the corporate image, etc.

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