Drive device for a secondary air injection system

Details Drive device for a secondary air injection system Drive device for a secondary air injection system

2006-09-05

2006-09-05

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S277000, C060S289000, C060S290000

Reexamination Certificate

active

07100368

ABSTRACT:
In a secondary air injection system, MOSFETs control supply of electric current to an air pump and to a motor for driving an electromagnetic valve and to an electromagnetic coil to introduce secondary air into an exhaust gas passage upstream of a catalyst for purifying the exhaust gas of an internal combustion engine. Gate drive circuits control the MOSFETs based on an instruction from an ECU via input signal processing circuits. Abnormal conditions in the operation for controlling the air pump and the electromagnetic valve are detected, and, when an abnormal condition is detected, forcibly turn the MOSFETs off to interrupt the current to the motor and to the electromagnetic coil. A diagnosing circuit sends to the ECU diagnosis signals representing the state of controlling the load.

REFERENCES:
patent: 5852929 (1998-12-01), Kato et al.
patent: 6658841 (2003-12-01), Beer et al.
patent: 6898927 (2005-05-01), Morinaga et al.
patent: 6945035 (2005-09-01), Hirooka et al.
patent: 6978203 (2005-12-01), Yasui et al.
patent: 2003/0070423 (2003-04-01), Morinaga et al.
patent: 2003/0101716 (2003-06-01), Hirooka et al.
patent: 7-11939 (1995-01-01), None

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