Method of purifying exhaust gases of an Otto-cycle engine

Details Method of purifying exhaust gases of an Otto-cycle engine Method of purifying exhaust gases of an Otto-cycle engine

1992-11-09

1994-04-19

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

60278, 60285, F02M 2507, F01N 320

Patent

active

053036867

ABSTRACT:
Exhaust gases are caused to flow back into the cylinders of an Otto-cycle engine through exhaust valves when the pistons stay at the bottom dead centers of the induction stroke. This enables the exhaust gases leaving the cylinder during the exhaust stroke to have a sufficiently high temperature to activate a catalyst for purifying the exhaust gases even when the engine still has a low temperature during the beginning of its operation at a low load.

REFERENCES:
patent: 3298332 (1967-01-01), Elsbett
patent: 3507261 (1970-04-01), Myers et al.
patent: 4357917 (1982-11-01), Aoyama
patent: 4424790 (1984-01-01), Curtil
patent: 4700684 (1987-10-01), Pischinger et al.
patent: 4732116 (1988-03-01), Tanahashi et al.
patent: 5201173 (1993-04-01), Fujimoto et al.

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