Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Reexamination Certificate
1997-09-29
2001-03-20
Kamen, Noah P. (Department: 3747)
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
C123S1980DB
Reexamination Certificate
active
06202412
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and apparatus for fault recognition in an internal combustion engine.
BACKGROUND INFORMATION
A conventional method and apparatus for fault recognition in an internal combustion engine in the region of the high-pressure circuit in the case of a common rail system are described in U.S. Pat. No. 5,241,933. In this method and apparatus, the pressure in the rail is regulated. If the manipulated variable of the pressure regulation circuit lies outside a definable range, the apparatus recognizes a fault.
A disadvantage with this arrangement is that a fault is recognized only in the case of a considerable pressure drop.
A method and device for fault recognition in an internal combustion engine are also described in German Patent Application No. 38 03 078. With this conventional method and apparatus, when the engine is coasting, the actuator which determines the quantity of fuel to be injected is moved to its mechanical stop at which no injection occurs. If, in this operating state, pulses occur at a so-called needle movement sensor, a fault is assumed to exist.
A device for controlling boost pressure in an internal combustion engine operated with turbocharging is described in German Patent Application No. 31 29 686.
One of the objects of the present invention is to be able to recognize faults as reliably as possible using an apparatus for fault recognition in an internal combustion engine.
SUMMARY OF THE INVENTION
It is possible to recognize faults reliably and easily in the area of fuel metering using a method and apparatus according to the present invention. In particular, sticking solenoid valves in the case of solenoid valve-controlled fuel metering devices, or an eccentric detachment in the case of distributor pumps, or a control rod break in the case of in-line pumps can be reliably detected.
REFERENCES:
patent: 4434761 (1984-03-01), Ludwig
patent: 4531493 (1985-07-01), Fortnagel
patent: 4633670 (1987-01-01), Iwasa
patent: 31 29 686 (1983-02-01), None
patent: 38 03 078 (1989-08-01), None
patent: 2 079 364 (1982-01-01), None
Dieners Bruno-Hans
Driedger Guenter
Lange Thomas
Lutz Peter
Kamen Noah P.
Kenyon & Kenyon
Robert & Bosch GmbH
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