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Control method of idling speed double closed-loop of gaseous propellant engine

A double closed-loop control, engine idling technology, applied in engine control, fuel injection control, electrical control, etc., can solve the problems of severe engine jitter, increased engine speed fluctuation, affecting car comfort, etc., and achieve stable speed output. , the effect of good comfort

Inactive Publication Date: 2012-06-27
BEIJING UNIV OF TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

With this control algorithm, the fuel supply cannot be changed with the change of the idling condition. Therefore, in the case of a sudden change in the idling condition, the fluctuation of the engine speed will increase, and even cause the engine to vibrate violently. Affect the comfort of the car

Method used

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  • Control method of idling speed double closed-loop of gaseous propellant engine
  • Control method of idling speed double closed-loop of gaseous propellant engine
  • Control method of idling speed double closed-loop of gaseous propellant engine

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Embodiment Construction

[0068] The present invention will be further explained below in conjunction with the drawings:

[0069] This embodiment uses two sets of incremental PID control algorithms to perform PID closed-loop control on the gas fuel injection pulse width and the bypass air intake volume under idling conditions. The two do not interfere with each other and are independent of each other. The closed-loop control principle diagram is as follows figure 1 Shown. During the operation of the engine, a certain speed deviation will inevitably occur between the target speed and the actual speed. At this time, the gas fuel injection pulse width and bypass air intake volume can be adjusted according to their respective PID algorithms. And the control cycle can also be adjusted through parameter settings, thus completing the double closed loop control. With this control method, the gas fuel injection pulse width and bypass air intake volume can be adjusted adaptively according to the idle speed deviati...

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Abstract

The invention relates to a control method of idling speed stability of a gaseous propellant engine for automobiles, belonging to the field of internal-combustion engine electronic control. The gaseous propellant engine needs to operate under relatively stable rotating speed in case of idling operation and the idling speed is as low as possible so as to reduce fuel consumption; however, much too low idling speed is prone to facilitate the engine to tremendously wobble. In the invention, idling speed of the gaseous propellant engine is taken as a control objective, a double closed-loop control algorithm is adopted, that is, closed-loop control is carried out on natural gas injection pulse width and bypass air input respectively by PID algorithm; an idling speed double closed-loop test snoopware is adopted to carry out real-time monitoring on the natural gas engine, so as to seek the optimal PID parameter matching and obtain stable idling speed, as a result, automobiles powered by natural gas can be provided with comfortable driving environment in case of idling operation.

Description

Technical field [0001] The invention relates to a method for controlling the idle speed of a gas fuel engine, which is mainly applied to control the stability of the idle speed of a gas fuel engine for a vehicle, thereby reducing the fluctuation of the idle speed of the gas fuel engine, thereby obtaining a relatively stable idle speed . It belongs to the field of internal combustion engine electronic control. Background technique [0002] The idling condition of the engine refers to a stable operating condition in which the accelerator pedal is fully released, there is no external power output, and the minimum stable speed can be maintained, and the engine does not stall. Idling mode is one of the most important operating conditions of the engine, especially as the number of cars continues to increase, urban traffic conditions cannot be improved in time, and the engine runs more and more times under idling conditions. Therefore, the control of idling conditions is particularly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/16
Inventor 张红光郑轶刘凯白明蕊
Owner BEIJING UNIV OF TECH
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