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

A double-closed-loop control and engine idling technology, which is applied in engine control, fuel injection control, electrical control, etc., can solve problems such as severe engine vibration, increased engine speed fluctuations, and affecting vehicle comfort, and achieve stable speed output , good comfort effect

Inactive Publication Date: 2009-09-16
BEIJING UNIV OF TECH
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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

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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 described below in conjunction with accompanying drawing:

[0069] In this embodiment, two sets of incremental PID control algorithms are used to perform PID closed-loop control on the injection pulse width of gas fuel and the intake air volume of bypass air under idle conditions. The two do not interfere with each other and are independent of each other. The closed-loop control schematic diagram is as follows figure 1 shown. During the operation of the engine, there must be a certain speed deviation between the target speed and the actual speed. At this time, the gas fuel injection pulse width and the bypass air intake amount can be adjusted according to their respective PID algorithms. Moreover, the control cycle can also be adjusted through parameter settings to complete double closed-loop control. This control method can make the injection pulse width of gas fuel and the intake air volume of bypass air self-adaptively adjusted...

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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 idling speed of a gas fuel engine, which is mainly applied to controlling the stability of the idling speed of a gas fuel engine for a vehicle, so as to reduce the fluctuation of the idling speed of the gas fuel engine and obtain a relatively stable idling speed . It belongs to the field of electronic control of internal combustion engines. Background technique [0002] The idling condition of the engine refers to a stable operating condition in which the accelerator pedal is completely released, there is no power output to the outside, the minimum stable speed can be maintained, and the engine does not turn off. The idling condition is one of the most important operating conditions of the engine, especially with the continuous increase of the number of cars, the urban traffic conditions cannot be improved in time, so the running time of the engine under the idling condition is increasing. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(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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