Engine mixture control system controlling primary and secondary

Details Engine mixture control system controlling primary and secondary Engine mixture control system controlling primary and secondary

1980-12-31

1983-05-31

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 60289, 123438, 123440, 251129, 251139, F01N 322

Patent

active

043854915

ABSTRACT:
An internal combustion engine includes an intake system, an exhaust system, and a mixture supply device which supplies primary fuel-air mixture into the intake system. An oxygen sensor assembly detects oxygen concentration at a certain point in the exhaust system and produces a first electrical signal which represents this concentration. A secondary air flow control circuit receives this first electrical signal and produces a second electrical signal according thereto. A secondary air supply system feeds secondary air into the exhaust system upstream of the aforementioned certain point at a flow rate controlled by the second electrical signal. A primary air/fuel ratio correction circuit receives either the first or the second electrical signal and based on it produces a primary mixture control electrical signal. This primary mixture control electrical signal is received by a mixture control system, which alters the primary air/fuel ratio of the mixture provided by the mixture supply device in accordance therewith.

REFERENCES:
patent: 3832848 (1974-09-01), Scholl
patent: 3875907 (1975-04-01), Wessel
patent: 4122811 (1978-10-01), Bowler
patent: 4136645 (1979-01-01), Ito
patent: 4149376 (1979-04-01), Masaki
patent: 4246875 (1981-01-01), Bier
patent: 4286767 (1981-09-01), Hashimoto

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