Control apparatus for internal combustion engine with exhaust ga

Details Control apparatus for internal combustion engine with exhaust ga Control apparatus for internal combustion engine with exhaust ga

1995-06-05

1996-04-16

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Idle speed control

123571, F02D 4116, F02M 2507

Patent

active

055072623

ABSTRACT:
In a mechanical type EGR apparatus, an EGR valve receives a negative pressure near a throttle valve and opens/closes an EGR path in response to the negative pressure. An EGR-VM is operated in response to an exhaust gas pressure to control a diaphragm back pressure to be introduced into the EGR valve. A CPU calculates a control amount of an ISC valve in order to obtain an optimum EGR ratio characteristic, depending upon engine operation conditions, and drives the ISC valve based on this control amount. The negative pressure at the negative pressure around the throttle valve is changed when the ISC valve is opened/closed and thus a portion of air into the engine flows through a bypass path, so that the diaphragm back pressure into the EGR valve is controlled to a desired value.

REFERENCES:
patent: 4210112 (1980-07-01), Nakamura et al.
patent: 4281631 (1981-08-01), Yamaguchi
patent: 4300516 (1981-11-01), Hayakawa
patent: 4313415 (1982-02-01), Shinzawa
patent: 4373487 (1983-02-01), Hamren
patent: 4397289 (1983-08-01), Haka et al.
patent: 4691675 (1987-09-01), Iwaki
patent: 4750466 (1988-06-01), Hibino et al.
patent: 5325828 (1994-07-01), Yamaguchi et al.
patent: 5343840 (1994-09-01), Wataya et al.

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