Secondary air supplying apparatus

Details Secondary air supplying apparatus Secondary air supplying apparatus

2006-09-19

2006-09-19

Jiang, Chen Wen (Department: 3744)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S293000, C062S178000, C123S041050, C123S674000

Reexamination Certificate

active

07107762

ABSTRACT:
A secondary air supplying apparatus of the present invention comprises a secondary air supplying device for supplying secondary air to upstream of an emission purifying device in an exhaust system of an internal combustion engine, a coolant temperature sensor for detecting a temperature of a coolant for the engine, an intake air temperature sensor for detecting a temperature of intake air, a supply controller for actuating the secondary air supplying device in accordance with a predetermined secondary air supply condition, and a summing unit for summing an actuation period of the secondary air supplying device and storing a sum. The supply controller stops the secondary air supply by the secondary air supplying device when the sum stored by the summing unit reaches a predetermined upper limit. The summing unit resets the stored sum, if a difference between the coolant temperature and the intake air temperature at a point before the actuation of the secondary air supplying device is not more than a predetermined value. This configuration enables the apparatus to suppress oversupply of secondary air and overheating of a catalyst so as to implement appropriate activation of the catalyst.

REFERENCES:
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patent: 5881552 (1999-03-01), Iwata et al.
patent: 6192678 (2001-02-01), Tachibana
patent: 6-248937 (1994-09-01), None
patent: 2000-240434 (2000-09-01), None
patent: 2004108265 (2004-04-01), None

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