Air-fuel ratio control device for an internal combustion engine

Internal-combustion engines – Charge forming device – Including cylinder pressure or temperature responsive means

Patent

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Details

Other Related Categories

36443105, F02D 4114

Type

Patent

Status

active

Patent number

049286536

Description

ABSTRACT:
An air-to-fuel ratio control device for an internal combustion engine is disclosed, which comprises a pressure sensor for detecting the pressure P within a cylinder of the engine, and means for computing an actual value of the ratio (dP/d.theta.)max/Pmax, wherein (dP/d.theta.)max is the maximum rate of change in pressure P within the cylinder with respect to the crank angle .theta. and Pmax is the maximum pressure in the cylinder during a predetermined interval in a cycle of the cylinder. A target value of the ratio (dP/d.theta.)max/Pmax is obtained by converting the optimum air-to-fuel ratio corresponding to the operating condition of the engine, the conversion being effected by means of a relationship established between the values of the air-to-fuel ratio and those of the ratio (dP/d.theta.)max/Pmax. A control element controls the amount of injected fuel to reduce the deviation of the actual value of the ratio (dP/d.theta.)max/Pmax with respect to the target value thereof.

REFERENCES:
patent: 4622939 (1986-11-01), Matekunas
patent: 4732126 (1988-03-01), Ikeura et al.
patent: 4753204 (1988-06-01), Kojima et al.
patent: 4800500 (1989-01-01), Tanaka

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