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Method for judging and controlling super detonation

A technology of super knocking and control method, which is applied in electrical control, engine control, fuel injection control, etc. It can solve the problems of adding additional devices and achieve the effects of avoiding carbon deposits, suppressing the occurrence of super knocking, and reducing the temperature in the cylinder

Active Publication Date: 2013-10-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a method for judging and controlling super-knock, which solves the problem of needing to add additional devices

Method used

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  • Method for judging and controlling super detonation
  • Method for judging and controlling super detonation

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Embodiments of the present invention firstly provide a method for judging and controlling super knock, such as figure 1 As shown, the method includes:

[0036] S1, judging whether there is super-knock in the cylinder of the gasoline engine during the working cycle, if so, go to step S2;

[0037] S2. In the intake stroke of the subsequent n working cycles, the fuel injection of the cylinder with super knock is divided into two injections, and it is judged whether the super knock occurs in the cylinder in n working cycles. Then the working cycle restores the cylinder to the calibration working condition; if yes, then return to step S2, said n is greater than or equal to 1.

[0038] In the super-knock control method proposed in the embodiment of the present invention, at first it is judged whether super-knock has occurred in the...

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Abstract

The invention provides a method for judging and controlling super detonation. The method comprises the following steps of: S1, judging whether super detonation occurs to a cylinder of a gasoline engine in the working cycle and if yes, carrying out the step S2; and S2, in the gas inlet process of the following n working cycles, carrying out oil spraying for twice on the cylinder to which super detonation occurs, judging whether super detonation occurs to the cylinder in the n working cycles, recovering the cylinder to the declared working condition in the following working cycles if no, and returning to the step S2 if yes, wherein n is more than or equal to 1. By the method disclosed by the invention, continuous occurrence of super detonation can be effectively inhibited; any additional devices are not required; and cost is low.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a method for judging and controlling super knock. Background technique [0002] The supercharged cylinder direct injection gasoline engine can flexibly control fuel injection and greatly reduce fuel consumption, but the displacement is reduced due to the improvement of engine performance. Under low-speed and high-load conditions, the gasoline engine will have several super knocks every few minutes. Knocking is an occasional abnormal combustion phenomenon that has not been fully understood so far, that is, it starts to ignite and burn before the ignition of the spark plug, which is extremely destructive, and can make the instantaneous cylinder pressure even exceed 20MPa, accompanied by huge pressure oscillations; The harm of the engine is huge, with sporadic and intermittent characteristics, and conventional knock control measures are ineffective for this pheno...

Claims

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Application Information

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IPC IPC(8): F02D41/30F02D41/22
Inventor 王志徐雅齐王建昕
Owner TSINGHUA UNIV
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