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Control method and system for natural gas engine EGR knocking correction

A control method and engine technology, applied in the direction of engine control, engine cooling, electrical control, etc., can solve the problems of engine exhaust temperature rise, emission deterioration, etc., to ensure safety, improve knock control speed, and prevent recurrence There is a knock effect

Active Publication Date: 2020-02-04
WEICHAI XIGANG NEW ENERGY POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional ignition engine knock control method only suppresses the knock by correcting the ignition advance angle of the engine. Reducing the ignition advance angle will increase the exhaust temperature of the engine and deteriorate the emissions.
In today's increasingly stringent emission regulations, the method of suppressing knocking only by correcting the ignition advance angle can no longer meet the demand

Method used

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  • Control method and system for natural gas engine EGR knocking correction
  • Control method and system for natural gas engine EGR knocking correction

Examples

Experimental program
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Embodiment 2

[0081] Such as figure 2 As shown, a natural gas engine EGR knock correction system includes an acceleration sensor arranged on the body, the acceleration sensor is electrically connected to the electronic control unit; the acceleration sensor transmits an electrical signal corresponding to the vibration of the body to the electronic control unit, and the electronic control unit The vibration signal is set to determine whether knocking occurs, and the ignition advance angle, EGR valve opening and / or throttle opening are corrected according to the comparison result.

[0082] The system of the present invention also includes a preset unit and a storage unit electrically connected to the electronic control unit, wherein the preset unit stores the preset vibration signal, the preset intake air temperature and the preset coolant temperature to the electronic control unit; The storage unit is used to store the EGR valve correction amount and the fan speed correction amount when knoc...

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Abstract

The invention discloses a control method and system for natural gas engine EGR knocking correction. The system comprises an acceleration sensor arranged on a engine body, wherein the acceleration sensor collects the vibration of the engine body, converts the vibration of the engine body into a corresponding electric signal and transmits the corresponding electric signal to an electric control unit, the electric control unit compares the electric signal corresponding to the vibration of the engine body with a preset vibration signal, and judges whether knocking occurs or not according to the comparison result; and if knocking occurs, the spark advance angle is corrected, and the EGR valve opening degree and / or the throttle valve opening degree are / is corrected so that knocking is quickly controlled. When knocking occurs, the output power of an engine is calculated, whether the output power exceeds the required power or not is judged, and if yes, the throttle valve opening degree is corrected, so that the intake gas amount is adjusted and driving safety is ensured. Therefore, the control method and system for natural gas engine EGR knocking correction can quickly control knocking, prevent re-occurrence of knocking and ensure driving safety.

Description

technical field [0001] The invention relates to the technical field of natural gas engines, in particular to a control method and system for EGR corrected knocking of natural gas engines. Background technique [0002] As the national emission regulations continue to become stricter, spark ignition natural gas engines for vehicles need to meet the National VI emission standards, and exhaust gas recirculation (EGR) has also been added to the technical route of the engines. The traditional ignition engine knock control method only suppresses the knock by correcting the ignition advance angle of the engine, and reducing the ignition advance angle will increase the exhaust temperature of the engine and deteriorate the emissions. In today's increasingly stringent emission regulations, the method of suppressing knocking only by correcting the ignition advance angle can no longer meet the demand. Contents of the invention [0003] In view of the above-mentioned deficiencies, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00F02P5/152F02D41/00F02M31/20F01P7/04
CPCF01P7/026F01P7/04F02D37/02F02D41/0002F02D41/0055F02D2200/02F02D2200/04F02M31/205F02P5/152
Inventor 刘旭东张锡强李哲李玉帅
Owner WEICHAI XIGANG NEW ENERGY POWER
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