Engine all-cylinder nonuniformity compensation control method based on indicated torque

A compensation control, uniformity technology, applied in the direction of engine control, machine/engine, electrical control, etc., can solve problems such as non-uniformity

Inactive Publication Date: 2015-01-21
JILIN UNIV
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  • Application Information

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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 bas

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  • Engine all-cylinder nonuniformity compensation control method based on indicated torque
  • Engine all-cylinder nonuniformity compensation control method based on indicated torque
  • Engine all-cylinder nonuniformity compensation control method based on indicated torque

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Embodiment Construction

[0026] The present invention is described in detail below in conjunction with accompanying drawing:

[0027] In order to introduce the content of the present invention in detail, some related concepts are defined:

[0028] Definition 1: Indicated torque refers to the output torque of the crankshaft equivalent to the indicated work obtained by converting the heat and power of one working cycle of the cylinder, expressed as Trq I express.

[0029] Definition 2: Indicated torque residual refers to the difference between the average indicated torque and the reference indicated torque in the working range of the cylinder, where the reference indicated torque is the target demand indicated torque under this working condition. The indicated torque residual brings about the fluctuation of the crankshaft speed before and after the work interval.

[0030] Definition 3: The relative residual of indicated torque refers to the ratio of indicated torque residual to target demand indicated...

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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...

Claims

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Application Information

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IPC IPC(8): F02D41/14F02D41/30
Inventor 李闯林学东李德刚江涛侯玉晶张康平
Owner JILIN UNIV
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