Method and device for controlling gas proportional valve of natural gas engine

Abstract

The invention provides a control method and device for a gas proportional valve of a natural gas engine. The method comprises the steps that whether the gas proportional valve currently meets the zero position self-learning condition or not is judged; if yes, the current valve closing accumulated number of times of the detected gas proportional valve is determined; judging whether the current accumulated number of valve closing times is greater than a preset valve closing threshold value or not; if the current accumulated number of valve closing times is larger than a preset valve closing threshold value, when it is detected that the current actual closing position of the gas proportional valve is within the zero point position threshold value range, the gas proportional valve is corrected; therefore, under the condition of zero offset of the gas proportional valve, the opening degree of the gas proportional valve can be corrected, the gas proportional valve can still provide proper and correct gas supply flow, gas leakage and pipeline blockage are prevented, the fault false alarm problem is reduced, and compared with an existing control strategy, the control strategy is more comprehensive and accurate.

Description

technical field [0001] The invention belongs to the technical field of gas proportional valve control, and more specifically relates to a method and device for controlling a gas proportional valve of a natural gas engine. Background technique [0002] The gas proportional valve of the existing natural gas engine cannot perform reasonable electronic control logic control on the opening and closing positions of the gas, which may easily lead to problems such as inaccurate control of the gas supply flow and poor sealing of the closing position of the gas proportional valve. [0003] Under complex application environment conditions, the pressure of the pipeline required by the gas injection valve is too high, which easily leads to pipeline leakage, and the gas nozzle is easily blocked by impurities, resulting in a high failure rate of the gas injection valve and its pipeline in the market; The control logic cannot quickly and effectively monitor and control the gas opening and c...

AI Technical Summary

Problems solved by technology

[0002] The gas proportional valve of the existing natural gas engine cannot perform reasonable electronic control logic control on the opening and closing positions of the gas, which may easily lead to problems such as inaccurate control of the gas supply flow and poor sealing of the closing position of the gas proportional valve.

[0003] Under complex application environment conditions, the pressure of the pipeline required by the gas injection valve is too high, which easily leads to pipeline leakage, and the gas nozzle is easily blocked by impurities, resulting in a high failure rate of the gas injection valve and its pipeline in the market; The control logic cannot quickly and effectively monitor and control the gas opening and closing of the gas proportional valve

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