Measuring and testing – Simulating operating condition – Marine
Patent
1998-08-14
2000-10-17
Dombroske, George
Measuring and testing
Simulating operating condition
Marine
731182, 701 29, F01N 322, F01N 700, G01M 1500
Patent
active
061314471
ABSTRACT:
In the case of a process for checking the operability of a secondary air pump in an internal-combustion engine in a motor vehicle using an electronic control unit, the control unit detects the rotational speed of the internal-combustion engine and the throttle valve angle in the intake system of the internal-combustion engine. Using a characteristic diagram stored in the control unit, as a function of the detected rotational speed and the detected throttle valve angle, the rate of air flow into the cylinders of the internal-combustion engine is estimated. Using an air flow rate sensor, the overall rate of air flow is sensed which is composed of the air flow into the cylinders of the internal-combustion engine and the secondary air flow delivered by way of a secondary air pipe into an exhaust gas duct. Subsequently, the difference is analyzed between the overall rate of air flow and the rate of air flow into the cylinders of the internal-combustion engine to determine the operability of the secondary flow system.
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Bayerische Motoren Werke Aktiengesellschaft
Dombroske George
LandOfFree
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