Drive device for a secondary air injection system
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United States of America Patent
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-
Sep 5, 2006
Grant Date -
Sep 29, 2005
app pub date -
Dec 30, 2004
filing date -
Mar 25, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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