Process and arrangement for checking the operability of a second

Details Process and arrangement for checking the operability of a second Process and arrangement for checking the operability of a second

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.

REFERENCES:
patent: 4892072 (1990-01-01), Miwa et al.
patent: 5659134 (1997-08-01), Tanaka et al.
patent: 5709082 (1998-01-01), Harris et al.
patent: 5714683 (1998-02-01), Maloney
patent: 5753805 (1998-05-01), Maloney
patent: 5845627 (1998-12-01), Olin et al.

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