Control system and method for direct fuel injection engine

Details Control system and method for direct fuel injection engine Control system and method for direct fuel injection engine

1995-09-28

1997-07-01

Wolfe, Willis R.

Internal-combustion engines

Combustion chamber means having fuel injection only

Using multiple injectors or injections

60285, F01N 302, F02B 304, F02D 4140, F02D 4304

Patent

active

056427050

ABSTRACT:
In a catalyst activation control system for a direct fuel injection engine for igniting primary fuel injected into each cylinder, an additional fuel is injected at least once into each cylinder from an early period to a middle period of an expansion stroke of the primary fuel combustion in accordance with the engine operating conditions, to fire the additional injection fuel by flame propagation of the preceding fuel combustion (without re-ignition) for eliminating misfire, so that an exhaust gas temperature can be raised stably to activate catalyst for purification of exhaust gas. Further, any one of the additional fuel injection method and an ignition timing retarding method can be appropriately selected in accordance with the engine operating conditions for economization of fuel. Further, whenever a quantity of heat generated by the primary fuel combustion is not large enough to fire the additional injection fuel, any one of a method of changing a stratification combustion to a uniform combustion, a method of increasing the first fuel injection amount, and a method of interrupting the additional fuel injection can be selected appropriately for protectiing the catalyst.

REFERENCES:
patent: 2917031 (1959-12-01), Nestorovic
patent: 4452040 (1984-06-01), Kobashi
patent: 4709547 (1987-12-01), Pischinger et al.
patent: 4913113 (1990-04-01), Baranescu
patent: 5460128 (1995-10-01), Kruse
patent: 5482017 (1996-01-01), Brehob et al.

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