A Compensation Control Method for Non-uniformity of Engine Cylinders Based on Indicated Torque

Abstract

The invention discloses an engine all-cylinder nonuniformity compensation control method based on indicated torque. The method aims to solve the problem that in the prior art, all cylinders of a multi-cylinder engine are not uniform. The method comprises the steps that firstly, instantaneous rotational speeds of air cylinders at the end point of an acting interval are obtained and converted into instantaneous angular speeds; secondly, the average rotational speed of the air cylinders in the acting interval is obtained and converted into an average angular speed; thirdly, a basic indicated torque relative residual error is calculated according to the instantaneous angular speeds of the air cylinders at the end point of the acting interval, the average angular speed of the air cylinders in the acting interval and target demand indicated torque of the air cylinders; fourthly, a modified indicated torque relative residual error is calculated according to the basic indicated torque relative residual error; lastly, the fuel jet quantity of all the cylinders are subjected to compensating adjustment through a learning type modification algorithm according to the calculated modified indicated torque relative residual error. The method is suitable for the full life circle of the engine, good in compensation effect, stability and responsiveness and beneficial to improving the performance of the engine.

Description

technical field [0001] The invention relates to a control of a combustion engine, in particular to a compensation method for a multi-cylinder engine based on a learning-type fuel injection amount of the indicated torque relative residual of each cylinder. Background technique [0002] When the four-stroke multi-cylinder engine is working, there is inhomogeneity in the working process of each cylinder, which directly affects the performance and vibration noise of the engine. For the mass-regulated engine, the unevenness of each cylinder is caused by the inconsistency between the actual fuel injection amount and the actual intake air amount of each cylinder, as well as the inconsistency of the working conditions of each cylinder. It leads to the deviation of the work done by each cylinder of the engine in the same cycle. This deviation not only affects the performance of the engine but also directly causes the fluctuation of the crankshaft's transient speed, resulting in vibra...

AI Technical Summary

Problems solved by technology

[0004] In order to effectively improve the problem of non-uniformity of each cylinder of a multi-cylinder engine, the present invention provides a compensation method based on the learning-type fuel injection amount based on the relative residual error of the indicated torque of each cylinder, which is suitable for a torque-based engine control method. The present invention It is realized by adopting the following technical solutions:

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