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Control method of electric control petrol engine transient operating condition air/fuel ratio

A technology of transient working conditions and control methods, applied in electrical control, engine control, fuel injection control, etc., can solve the problems of poor engine emission level and economy, large changes in air-fuel ratio, etc., to compensate for response lag and reduce The effect of calculation error

Inactive Publication Date: 2011-11-16
江苏汇动汽车电子有限公司
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Problems solved by technology

[0005] The object of the present invention is to solve the large air-fuel ratio change and engine emission caused by the untimely fuel supply response speed of the current electric injection gasoline engine control system in transient conditions by providing a method for controlling the air-fuel ratio of the electronically controlled gasoline engine under transient conditions. The problem of poor level and economy

Method used

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  • Control method of electric control petrol engine transient operating condition air/fuel ratio
  • Control method of electric control petrol engine transient operating condition air/fuel ratio
  • Control method of electric control petrol engine transient operating condition air/fuel ratio

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Embodiment Construction

[0044] Specific embodiments of the present invention are described below in conjunction with accompanying drawing:

[0045]see figure 1 As shown, it is an explanatory diagram of synchronous enrichment and asynchronous enrichment sequence of a four-cylinder gasoline engine; the small pulse width indicated by the dotted line in the figure is the synchronous enrichment pulse width of each cylinder, and the small pulse width indicated by the solid line is the asynchronous enrichment pulse width of each cylinder. Thick pulse width. It can be seen from the figure that the synchronous enrichment pulse width is output when the engine runs to a specific phase, while the asynchronous enrichment pulse width has nothing to do with the engine phase, and can be controlled by the main loop of the control program (execution cycle once every 8 milliseconds) ) is determined to start at any crankshaft angle, and once the enrichment condition is satisfied, the enrichment output is simultaneously...

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Abstract

The invention discloses a method for controlling air-fuel ratio of instantaneous condition of an electric controlled gasoline engine; the method comprises the following steps of: controlling of synchronous and asynchronous enriching of transient working condition of the electric controlled gasoline engine, intake pressure prediction method and closed loop controlling of transient working condition; the transient working condition comprises the following steps of: controlling the step of synchronous and asynchronous enriching, intake pressure prediction step, and closed loop controlling step of transient working condition; the common characteristic of the three methods is that precise control of air-fuel ratio is realized in the control process of the whole transient working condition; according to different working conditions, the enriching mode is selected automatically, thus guaranteeing control precision of the response speed of the acceleration process and the air-fuel ratio of the acceleration process furthest; in the instantaneous transient working condition, an oxygen sensor signal is used fully so as to modify the error of enrichment or desaturation furthest, thus improving economy and emission of engines.

Description

technical field [0001] The invention provides a method for controlling the air-fuel ratio of a gasoline engine in transient working conditions, and in particular relates to the control of an electronically controlled gasoline engine. Background technique [0002] Environmental protection and energy saving are the main goals of current automotive engine development. At present, gasoline and diesel are the main fuels for motor vehicles. Gasoline engines are widely used in small and medium-sized vehicles, while diesel engines are mainly used in large and heavy vehicles. The fuel supply method of gasoline engines has been developed over the years, from the traditional mechanical carburetor system to the electronically controlled single-point injection system, and then to the electronically controlled multi-point injection system, its emissions and fuel consumption have been greatly reduced. How to further reduce the emission and fuel consumption of gasoline engines has become a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14
Inventor 梁宏伟
Owner 江苏汇动汽车电子有限公司
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