Method for operating an electro motor-driven secondary air pump

Details Method for operating an electro motor-driven secondary air pump Method for operating an electro motor-driven secondary air pump

2006-10-03

2006-10-03

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S287000, C060S289000

Reexamination Certificate

active

07114327

ABSTRACT:
A method for operating an electro motor-driven secondary air pump which is provided for injecting secondary air into the exhaust system of an internal combustion engine. The secondary air pump is operated in a clocked manner. The induced voltage at the electro motor of the secondary air pump, measurable during the turn-off time of the clocked operation, is used for diagnosing as well as for controlling the speed of the secondary air pump. The diagnosis is carried out based on the evaluation of a parameter (difference quotient, differential quotient) of the induced voltage. The induced voltage is instantaneously a measure for the secondary air pump's actual speed value, so that a separate detection of the actual speed value is omitted.

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patent: 199 63 902 (2001-07-01), None

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