Functionality testing of secondary air injection systems

A method and system for detecting faults in a secondary air injection system 10 of an internal combustion engine 11. The system has an air pump 16 for supplying air to the engine exhaust manifold 13 and, a programmable unit 21 for controlling operation of the pump and valve and a pump current draw s...

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Bibliographic Details
Main Author SAM PRICE
Format Patent
LanguageEnglish
Published 30.01.2008
Subjects
BLASTING
ENGINE PLANTS IN GENERAL
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL
HEATING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
STEAM ENGINES
WEAPONS
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Summary:A method and system for detecting faults in a secondary air injection system 10 of an internal combustion engine 11. The system has an air pump 16 for supplying air to the engine exhaust manifold 13 and, a programmable unit 21 for controlling operation of the pump and valve and a pump current draw sensor 31 for sampling electrical current at predetermined time periods spaced over at least on operational cycle of the system. The measured pump current is analysed by the control unit 21 to identify failures in the system. Current draw is measured in three phases of the operational cycle of the system; a first phase with the pump on and the valve closed, a second phase with the pump on and the valve on and a third phase with the pump off and the valve closed.
Bibliography:Application Number: GB20060014834