Air amount computing unit and fuel control unit of internal combustion engine

Abstract

An air volume computing device for an internal combustion engine, comprising: an air volume detecting mechanism for detecting the air volume passing through an intake throttle portion of the internal combustion engine; and an air volume for obtaining a calculated value of the air volume passing through the intake throttle portion based on the throttle opening degree Calculation mechanism; use the difference between the current value of the air volume passing through the intake throttle part and the previous filtering value to filter, and remove the air volume filled in the intake manifold to obtain the air volume flowing into the cylinder of the internal combustion engine mechanism; the first filter based on the air volume detected by the air volume detection mechanism; the second filter based on the calculated value of the air volume obtained by the air volume calculation mechanism; selected when the internal combustion engine is stable The input value of the first filter and the last output value, the selected mechanism for selecting the input value and the last output value of the second filter at the transition of the internal combustion engine; the input of the selected value selected by the selected mechanism The third filter uses the output of the third filter as the amount of air flowing into the cylinder.

Description

technical field [0001] The present invention relates to an air amount calculation device and a fuel control device for an internal combustion engine used in vehicles such as automobiles, and more particularly to an air amount calculation device for calculating the amount of air flowing into a cylinder of an internal combustion engine, and a fuel control device for controlling the amount of fuel injected by using the amount of air flowing into a cylinder. control device. Background technique [0002] As an engine control device that calculates the intake pipe pressure and cylinder inflow air volume based on the air volume passing through the throttle valve, calculates the air volume passing through the throttle valve from the output of the throttle opening sensor, and compares its time change with the intake air volume output from the intake air volume sensor. The time variation of the air quantity is corrected according to the comparison result to the throttle valve passing ...

AI Technical Summary

Problems solved by technology

[0005] The calculation of the inflow air volume of the cylinder in the conventional engine control device is to add the time variation of the intake air volume calculated from the throttle valve opening to the intake air volume detected by the sensor only relative to the input of the filter, In the previous filter output value input to the filter, the intake air amount calculated from the throttle valve opening does not contribute, so a change point occurs in the next output, and as a result, the required air-fuel ratio may not be obtained.

Images