Long-term Learning Value Control of Internal Combustion Engine

Abstract

A long-term learning value control device for an internal combustion engine, comprising: an air amount learning control part configured to reduce or increase an ISCV correction value when a rotational speed is higher or lower than a set target value and to record, in an ECU, ISCV actuation value variation as air amount learning value; and a fuel learning control part configured to record in the ECU an O2FB learning value which changes while the ISCV actuation value variation is recorded. When air amount learning occurs, a fuel learning value is recorded in the ECU while the air amount learning value changes. Therefore, even if there is no intake air pressure sensor, a change in a fuel injection amount is recorded while a change in an idle air amount is recorded. After a method is changed, even a system without an intake air pressure sensor can synchronously change a fuel correction amount learning value when an intake air amount changes, so that the recording time of feedback learning is reduced and the reliability of the system is improved, thereby reducing bad phenomena during vehicle driving.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine control, in particular to a long-term learning value control device for an internal combustion engine. Background technique [0002] The idle air-fuel ratio of the vehicle is constant, and when the resistance changes, the amount of air and fuel required to maintain the target speed at idle also changes. When the resistance is high, more fuel and air are needed, and when the resistance is small, less fuel and air are needed. [0003] [0004] Among them, the air-fuel ratio is a fixed value. When the air volume increases or decreases, the fuel volume must be increased or decreased in the same proportion to ensure that the value of the air-fuel ratio does not change. [0005] When the idle speed learning correction with intake pressure detection is performed, the fuel quantity is corrected according to the intake pressure. [0006] When the resistance in the fuel injection sys...

AI Technical Summary

Problems solved by technology

However, the two changes are carried out separately. After the air volume (ISCV) learning value changes, there is a long time lag in the learning of the fuel learning value.

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