Engine idle speed target rotation speed control method

Abstract

The invention relates to an engine idle speed target rotation speed control method. The method comprises the following steps that a plurality of target idle speeds are obtained according to combustioncontrol requirements, the maximum one of the target idle speeds is taken and subjected to change rate limiting, and a combustion target idle speed n<SetpointComb> is obtained; a plurality of target idle speeds are obtained according to load control requirements, the maximum one of the target idle speeds is taken, and a load target idle speed n<SetpointLoad> is obtained; the sum of the combustiontarget idle speed n<SetpointComb> and the load target idle speed n<SetpointLoad> is calculated to obtain a target idle speed initial value n<SetpointRaw>; the target idle speed initial value n<SetpointRaw> is subjected to dynamic regulation to obtain a dynamic target idle speed rotation speed n<SetpointDyn>; the dynamic target idle speed rotation speed n<SetpointDyn> is subjected to smoothing treatment to obtain a final target idle speed rotation speed n<SetpointFinal>; and the idle speed of an engine is set to the final target idle speed rotation speed n<SetpointFinal>. According to the engine idle speed target rotation speed control method provided by the invention, sufficient consideration is performed at the final target idle speed rotation speed of the engine, the situation that the rotation speed is too high or too low can be avoided, and in addition, the stability of idle speed closed-loop control is high.

Description

technical field [0001] The invention relates to the field of engine idle speed control, in particular to an engine idle speed target rotational speed control method. Background technique [0002] At present, idling speed is the most common working condition when the engine is working. Too high idling speed will cause problems of fuel consumption, emissions and NVH (noise, vibration and harshness). Too low idling speed will cause engine vibration, NVH and other problems. In response to the country's increasingly stringent emission standards, as well as to enhance the brand image of OEMs, as well as consumers' higher and higher requirements for vehicle power, economy and comfort, gasoline engines have more and more components, which make the engine idle Controls are getting more and more complex. [0003] In the related art, an engine idle speed control method includes: obtaining the base idle speed corresponding to the current engine water temperature and the current altitud...

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a method for controlling the engine idle speed target speed, so as to solve the problems of insufficient consideration in calculating the engine target idle speed in the related art, resulting in too high or too low speed, and low stability of the idle speed control

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