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Preignition control method for supercharge non-direct-injection gasoline engine

A technology of gasoline engine and control method, applied in engine control, combustion engine, fuel injection control and other directions, can solve the problem that PFI engine does not have, and achieve the effect of reducing the probability of super knocking, improving reliability and comfort

Inactive Publication Date: 2016-03-09
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, direct injection engines can use secondary injection technology to effectively reduce super knock, but PFI engines do not have this function due to hardware reasons

Method used

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  • Preignition control method for supercharge non-direct-injection gasoline engine
  • Preignition control method for supercharge non-direct-injection gasoline engine

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] see figure 1 , the general control method that the present invention solves super-knock is: when the engine stand is demarcated and matched, the threshold A when super-knock takes place is calibrated according to the engine cylinder pressure and the knocking sound intensity. The super knock detection module judges whether super knock occurs according to the signal B measured by the knock sensor. When B>A, the controller determines that there is a super knock occurring at this time. At this time, the system will reduce the charge load of the engine and enrich the air-fuel ratio of the mixture. This measure lasts for a period of time (scaleable). When the system detects that there is no super knock, the controller will restore the proper operating conditions of the engine within a certain period of time (can be calibrated).

[0017] Specific control ...

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Abstract

The invention provides a preignition control method for a supercharge non-direct-injection gasoline engine. The preignition control method includes the steps that during calibrating and matching of an engine pedestal, the threshold value A generated when super detonation happens is calibrated according to the pressure of an engine cylinder and the intensity of detonation sounds; whether super detonation happens or not is judged according to whether an engine water temperature signal, an engine rotating speed signal and an engine relative inflation load signal exceed the limitation or not and whether a detonation sound intensity signal B is larger than A or not; when a controller judges that super detonation happens, the inflation load of the engine is controlled to be reduced, and the rich mixture air-fuel ratio is increased; and after the calibration time continues and no super detonation is detected, the controller can recover the due operation conditions within the calibration time. According to the preignition control method, the probability of occurrence of super detonation can be effectively reduced, and a whole vehicle is better in reliability and comfort.

Description

technical field [0001] The invention relates to a logic control method for solving pre-ignition of a supercharged non-direct injection gasoline engine. Background technique [0002] When a vehicle equipped with a supercharged non-direct injection gasoline engine runs under certain operating conditions, the mixture in the engine combustion chamber is prone to spontaneous combustion without ignition. This phenomenon is called pre-ignition or super knock. The appearance of super knock is accompanied by a strong metal knocking sound, and the driver can feel the sudden interruption of power when it is serious. The reasons for the occurrence of super-knock may be factors such as organic oil, hot spots in the cylinder, carbon deposits and particulate matter, and controlled compression ignition. The emergence of super knock seriously affects the reliability of the engine and the driving comfort of the vehicle. [0003] At present, direct injection engines can use secondary injecti...

Claims

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Application Information

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IPC IPC(8): F02D41/00F02D41/14
CPCF02D41/1475F02D41/402F02D35/027F02D41/0087Y02T10/40
Inventor 雷现齐
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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