Internal combustion engine system

Patent metadata

Field	Value
Publication number	US-10801429-B2
Application number	US-201916595807-A
Country	US
Kind code	B2
Filing date	Oct 8, 2019
Priority date	Nov 8, 2018
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

In an internal combustion engine system, a controller is configured to: perform a purge control during execution of an A/F feedback learning; detect a purge concentration after execution of the A/F feedback learning; calculate an A/F feedback learning correction value adjusted by offsetting an A/F feedback learning value with a contributing value of the purge concentration; disable updating of the A/F feedback learning correction value after calculation of the A/F feedback learning correction value and until the purge control is stopped; and detect the purge concentration based on an air-fuel ratio deviation amount.

First claim

What is claimed is:

1. An internal combustion engine system comprising:
an internal combustion engine;
a vaporized fuel treating apparatus configured to execute a purge control for treatment to supply purge gas to the internal combustion engine, the purge gas containing vaporized fuel generated in a fuel tank that stores fuel to be supplied to the internal combustion engine;
an air-fuel ratio detecting unit configured to detect an air-fuel ratio in the internal combustion engine; and
a controller configured to execute an air-fuel ratio learning to compensate an air-fuel deviation amount which is a deviation amount between the air-fuel ratio detected by the air-fuel ratio detecting unit and a target air-fuel ratio, and configured to control an amount of the fuel to be supplied to the internal combustion engine based on a learning value calculated by the air-fuel ratio learning,
wherein the controller is further configured to:
execute the purge control during execution of the air-fuel ratio learning;
detect a purge concentration after execution of the air-fuel ratio learning, the purge concentration being a concentration of the purge gas;
calculate a learning correction value by offsetting the learning value with a value corresponding to an extent of contribution of the purge concentration; and
disable updating of the learning correction value and detect the purge concentration based on the air-fuel deviation amount after calculation of the learning correction value until the purge control is stopped.

2. The internal combustion engine system according to claim 1 , wherein
the vaporized fuel treating apparatus includes a purge passage for flowing the purge gas and a purge pump provided in the purge passage, the purge pump being configured to control a flow rate of the purge gas, and
the controller is configured to detect the purge concentration for calculation of the learning correction value after execution of the air-fuel ratio learning, based on a detection value of pressure in the purge passage while a number of rotations of the purge pump is set to a predetermined value during stop of the purge control.

Assignees

• Aisan Ind

Inventors

• Asanuma Daisaku

Classifications

• F02D41/0045

  Estimating, calculating or determining the purging rate, amount, flow or concentration · CPC title

• F02M25/08

  adding fuel vapours drawn from engine fuel reservoir {(electrical control of purge system F02D41/003)} · CPC title

• F02D41/0032

  Controlling the purging of the canister as a function of the engine operating conditions · CPC title

• F02D41/2454 Primary

  Learning of the air-fuel ratio control · CPC title

• F02D41/2448

  Prohibition of learning · CPC title