Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
201 words
In an air-fuel ratio control system for an internal combustion engine having an exhaust passage, a carburetor for the engine, an electromagnetic valve for correcting the air-fuel ratio of air-fuel mixture supplied to said engine, an O 2 -sensor for detecting oxygen concentration of exhaust gases, a catalytic converter in said exhaust passage, and a feedback control circuit responsive to the output of said O 2 -sensor for producing signals for driving said electromagnetic valve for correcting the air-fuel ratio, the improvement wherein said O 2 -sensor is provided in said exhaust passage at a position downstream of said catalytic converter, and wherein said position is such that the volume of said exhaust passage from an inlet of the exhaust passage to said position is substantially twice as much as the volume from said inlet to an inlet of said catalytic converter, and said feedback control circuit comprises a differentiating circuit means for differentiating the output of said O 2 -sensor, a multivibrator means responsive to the output of said differentiating circuit means for generating output pulses, and a microcomputer means operating in dependency on the output pulses of said multivibrator means for producing outputs for operatively actuating said electromagnetic valve.
Claim 2
Dependent Claim
201 words
In an air-fuel ratio control system for an internal combustion engine having an exhaust passage, a carburetor for the engine, an electromagnetic valve for correcting the air-fuel ratio of air-fuel mixture supplied to said engine, an O 2 -sensor for detecting oxygen concentration of exhaust gases, a catalytic converter in said exhaust passage, and a feedback control circuit responsive to the output of said O 2 -sensor for producing signals for driving said electromagnetic valve for correcting the air-fuel ratio, the improvement wherein said O 2 -sensor is provided in said exhaust passage at a position downstream of said catalytic converter, and wherein said position is such that the volume of said exhaust passage from an inlet of the exhaust passage to said position is substantially twice as much as the volume from said inlet to an inlet of said catalytic converter, and said feedback control circuit comprises a differentiating circuit means for differentiating the output of said O 2 -sensor, a multivibrator means responsive to the output of said differentiating circuit means for generating output pulses, and a microcomputer means operating in dependency on the output pulses of said multivibrator means for producing outputs for operatively actuating said electromagnetic valve.
Claim 3
Dependent Claim
22 words
The air-fuel ratio control system for an internal combustion engine according to claim 1, wherein said multivibrator means is a monostable multivibrator.
Claim 4
Dependent Claim
22 words
The air-fuel ratio control system for an internal combustion engine according to claim 1, wherein said multivibrator means is a bistable multivibrator.
Claim 5
Dependent Claim
31 words
The air-fuel ratio control system for an internal combustion engine according to claim 1, further wherein said feedback control circuit includes a driver between said microcomputer means and said electromagnetic valve.