Engine transient air inflow estimation method based on model

An engine and air intake technology, applied in engine control, machine/engine, electrical control, etc., can solve problems such as poor engine charging efficiency change trend accuracy, poor air volume estimation accuracy, etc.
CN101892914AActive Publication Date: 2010-11-24FAW GROUP
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
FAW GROUP
Publication Date
2010-11-24

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Abstract

The invention relates to an engine transient air inflow estimation method based on model. The invention is characterized in that the method includes the following physical models and computing methods: acquisition and processing of inlet pressure sensor signal, a main aeration model based on speed-density method, a secondary aeration model based on throttle valve flow characteristic, a throttle valve angle estimation model, an inlet air pipe dynamic load model and estimation of volumetric efficiency; calculation process is that the secondary aeration model and the throttle valve angle estimation model are sequentially calculated in 10ms task and the current inlet pressure, the main aeration model, the inlet air pipe dynamic load model and the volumetric efficiency estimation model are calculated in tooth-missing interruption. Control accuracy is improved, thus avoiding the phenomena that torque responsiveness is poor under transient working condition and emission is worsen.
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Description

technical field

[0001] The invention relates to a method for estimating the transient intake air quantity of an engine based on a model, and belongs to the field of automotive electronic software development. Background technique

[0002] For volume regulation engine control, the fuel quantity is generally calculated according to the amount of intake air and the target air-fuel ratio. But for general port injection engines, the fuel injection time of the current cycle should be earlier than the completion time of the intake air quantity (it is generally considered that the intake air is completed at the bottom dead center of the intake cycle, but for pre-mixing, the fuel injection is generally injected into the intake manifold in advance Tube). Such as figure 1 As shown, the intake is completed at the bottom dead center of the intake stroke, and the fuel injection will be completed before that. Fuel concentration can be accurately guaranteed if the engine is operated unde...

Claims

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