Closed-loop control method for ignition energy of natural gas engine

Abstract

The invention relates to a closed-loop control method for ignition energy of a natural gas engine. The closed-loop control for the ignition energy of an engine is finally realized through ignition energy-storing current closed-loop control and sparking plug ignition energy closed-loop control; the ignition energy-storing current closed-loop control is completed in the manner of adjusting a feedback energy-storing current by an ignition energy-storing current according to an instruction, acquiring an energy-storing time compensation strategy input through proportional computation, acquiring the compensating ignition energy-storing time and adding the basic ignition energy-storing time; the sparking plug ignition energy closed-loop control is adopted for acquiring the sparking ignition width through a voltage wave sensed in a primary ignition coil in an ignition process, instructing the manner of ignition energy-storing current through the adjustment for the difference value of the sparking width and changing the ignition sparking width. Compared with the prior art, the closed-loop control method has the advantages that the ignition energy can be effectively identified, the control on the ignition energy of the engine under high rotating speed can be guaranteed, the closed-loop control can be achieved, the precision and the suitable working conditions thereof are not limited and the precision and accuracy are both higher.

Description

technical field [0001] The invention belongs to the technical field of engine control strategies, and relates to a closed-loop control method for ignition energy of a natural gas engine. Background technique [0002] Because the ignition system of each cylinder of the engine is slightly different when it leaves the factory, under the traditional treatment strategy, these differences will cause the ignition energy storage current of the primary ignition coil to be inconsistent, resulting in inconsistent ignition energy of each cylinder, affecting the combustion effect in the cylinder, and making the engine run Unbalanced, when the ignition system is used for a period of time, there will be aging phenomenon of performance degradation. If the aging phenomenon is not compensated and closed-loop control is not performed, the ignition energy of each cylinder of the engine will be insufficient, and in severe cases, it will misfire, and finally the engine condition will deteriorate. ...

AI Technical Summary

Problems solved by technology

For patent 2, it mainly adopts a sequential multiple ignition strategy under low speed conditions, and controls the ignition energy by controlling the number of ignition times, the time gap between multiple ignitions, and the closing time of the primary ignition coil, which cannot guarantee the ignition energy at high speeds. The ignition energy of the lower engine is controlled, and the energy control method is only open-loop control, which is far from closed-loop control, and the accuracy and applicable working conditions are too limited

For patent 3, the ignition energy control for mixed fuel engines focuses on the engine system for vehicles, and the method for operating the engine system at the engine ignition energy level is only on the level of control, precision and accuracy low sex

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