Exhaust gas recirculating system with reduced deposit

Details Exhaust gas recirculating system with reduced deposit Exhaust gas recirculating system with reduced deposit

1995-08-03

1996-08-20

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123571, F02M 2507

Patent

active

055469159

ABSTRACT:
An EGR valve in an EGR passage is provided with an EGR gas temperature sensor. When a detected EGR gas temperature is within a deposit generating temperature range, the opening of the EGR valve is corrected to the OPEN side to increase the EGR flow rate, and thereby the temperatures of the inside wall of the EGR passage and the EGR valve are quickly raised. Therefore, the heat radiation (temperature fall) of the EGR gas can be reduced and the EGR gas temperature is raised to or higher than the deposit generation temperature range. The accumulation of deposit on the inside wall of the EGR passage, a valve element of the EGR valve, etc. can be restrained. The EGR gas temperature may be estimated from engine conditions and the opening of the EGR valve.

REFERENCES:
patent: 4735186 (1988-04-01), Parsons
patent: 4793318 (1988-12-01), Tsurusaki
patent: 4834054 (1989-05-01), Hashimoto et al.
patent: 4870941 (1989-10-01), Hisatomi
patent: 4870942 (1989-10-01), Shibata et al.
patent: 4879986 (1989-11-01), Sakamoto
patent: 5309886 (1994-05-01), Hitomi et al.
patent: 5440880 (1995-08-01), Ceynow et al.

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