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Atkinson engine air-fuel ratio calculation method and system

A calculation method and air-fuel ratio technology, applied in the field of Atkinson engine air-fuel ratio calculation method and system, can solve the problem of inaccurate calculation of air-fuel ratio

Active Publication Date: 2018-07-24
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method and system for calculating the air-fuel ratio of an Atkinson engine to solve the problem of inaccurate calculation of the air-fuel ratio of an existing Atkinson engine

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  • Atkinson engine air-fuel ratio calculation method and system

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Embodiment 1

[0069] This embodiment provides a method for calculating the air-fuel ratio of an Atkinson engine, such as figure 1As shown, the method for calculating the air-fuel ratio of the Atkinson engine includes: calculating the basic intake air volume of the Atkinson engine cylinder; calculating the residual exhaust gas volume in the cylinder of the Atkinson engine; Calculate the intake return flow rate of the intake manifold of the Atkinson engine; calculate the basic fuel quantity of the cylinder of the Atkinson engine according to the basic intake air volume and the residual exhaust gas volume in the cylinder; Calculate the fuel compensation amount of the Atkinson engine cylinder according to the intake return flow rate; calculate the fuel injection quantity signal of the Atkinson engine cylinder according to the basic fuel amount and the fuel compensation amount, and calculate the air-fuel ratio.

[0070] Specifically, in the Atkinson engine air-fuel ratio calculation method, cal...

Embodiment 2

[0105] This embodiment also provides an Atkinson engine air-fuel ratio calculation system, the Atkinson engine air-fuel ratio calculation system is the carrier for realizing the Atkinson engine air-fuel ratio calculation method in the previous embodiment, such as figure 2 As shown, the Atkinson engine air-fuel ratio calculation system includes a basic intake air volume calculation unit 10, a cylinder residual exhaust gas volume calculation unit 20, an intake air return flow calculation unit 30, a basic fuel volume calculation unit 40 and a fuel compensation volume calculation unit 50 , wherein: the basic intake air quantity calculation unit 10 calculates the basic intake air quantity of the Atkinson engine cylinder, and provides the basic intake air quantity to the basic fuel quantity calculation unit 40; the cylinder The internal residual exhaust gas calculation unit 20 calculates the residual exhaust gas volume in the cylinder of the Atkinson engine, and provides the residua...

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Abstract

The invention provides an Atkinson engine air-fuel ratio calculation method and system. The Atkinson engine air-fuel ratio calculation method comprises the following steps of: calculating a basic airinflow of an air cylinder of an Atkinson engine; calculating a residual exhausted air quantity in air cylinder of the Atkinson engine; calculating an air inflow reflux quantity of an air inflow manifold of the Atkinson engine; calculating a basic fuel quantity of the air cylinder of the Atkinson engine according to the basic air inflow and the residual exhausted air quantity; calculating a fuel compensation quantity of the air cylinder of the Atkinson engine according to the air inflow reflux quantity; and calculating a fuel injection quantity signal of the air cylinder of the Atkinson engineaccording to the basic fuel quantity and the fuel compensation quantity, and calculating an air-fuel ratio.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method and system for calculating the air-fuel ratio of an Atkinson engine. Background technique [0002] The early Atkinson (Atkinson) cycle, through a set of complex crank-link mechanism, makes the expansion stroke of the engine larger than the compression stroke, and improves the thermal efficiency of the engine. Very troublesome, so it is not promoted. Modern Atkinson cycle engines use variable valve timing (Variable Valve Timing, VVT) technology to push part of the gas sucked into the cylinder during the intake stroke back into the intake port during the compression stroke by closing the intake valve late, so that the effective compression stroke of the engine is less than The effective expansion stroke increases the expansion ratio without increasing the effective compression ratio, and converts the heat energy generated after fuel combustion into mechanical energy to a ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 韩本忠柴智刚李乐刘宁习纲陈晖秦文刚
Owner UNITED AUTOMOTIVE ELECTRONICS SYST