An air-fuel ratio control system of an internal-combustion engine

Title:

An air-fuel ratio control system of an internal-combustion engine

Document Type and Number:

Japanese Patent JP5994385

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device for an internal combustion engine, ensuring stable driving during switching between liquid fuel and gas fuel.SOLUTION: A control device 41 mounted on an internal combustion engine 10 driven by selecting and switching gasoline or CNG to supply it to a combustion chamber 17 comprises a speed sensor 46 for detecting a driving speed of the internal combustion engine and an upstream side oxygen sensor 43 detecting oxygen concentration in exhaust gas. When executing overlap control for supplying both of the gasoline and the CNG in an overlapping manner or delay control for stopping the supply of both of them in response to fuel switching while extending the time corresponding to the length of a connection injector hose 51 of a CNG injector 32, the control is interrupted in a case below a set oxygen concentration when the internal combustion engine performing idle driving based on a detection driving speed of the speed sensor 46 and detection oxygen concentration of the upstream side oxygen sensor 43 is lowered to the driving speed or below at which a stall is likely to occur.

Inventors:

Mitsuhiro Shinohara
Toshiaki Masuda

Application Number:

JP2012116451A

Publication Date:

September 21, 2016

Filing Date:

May 22, 2012

Export Citation:

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