Method and system for restraining engine knock

Abstract

The invention relates to a method for restraining engine knock. The method comprises the steps that S1, a first correction coefficient of the fuel injection pulse width of an engine to be restrained is obtained; S2, the first correction coefficient is compared with a second correction coefficient of the fuel injection pulse width of standard fuel gas; and S3, according to the comparison result, combustion parameters of an engine are adjusted so as to restrain engine knock. According to the method and system for restraining engine knock, no device needs to be additionally arranged, the relation between fuel combustion correction coefficients of different gas components and combustion parameters is obtained through tests, the fuel gas correction parameters of the engine to be restrained are compared with the standard fuel gas correction coefficients, and through adjustment of the combustion parameters, happening of knock is restrained. Knock can be restrained without modifying an engine body, a knock sensor or gas sensor does not need to be additionally arranged, the cost of the engine is saved, reliability is high, and the actual use needs can be met.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method and system for suppressing engine knocking. Background technique [0002] With the continuous aggravation of environmental pollution, the requirements for vehicle emissions are becoming more and more stringent; there are varying degrees of shortages of diesel in various places, and the position of natural gas as an alternative energy source is becoming more and more prominent. With the liberalization of national policies, private capital is involved in the natural gas industry, and the composition of gas is diversified. After the engine inhales the mixture of gas and air, it has not reached the designed ignition position in the compression stroke, because other factors beyond the control cause the gas mixture to ignite and burn by itself. The huge impact force generated by the combustion is opposite to the direction of the piston movement, causing the engine to vibrate,...

AI Technical Summary

Problems solved by technology

However, to install a knock sensor on a gas engine developed based on a medium-heavy diesel engine body, the change to the body needs to change the blank, which will inevitably increase the cost of the vehicle, and the calibration method of the knock sensor is difficult, and the judgment standard is not obvious. Well, the probability of misjudgment of knocking in actual use will be very high; and the gas sensor is still in the research stage and cannot meet the actual use requirements

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