Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2011-08-02
2011-08-02
Wolfe, Jr., Willis R (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C701S115000, C123S458000, C123S480000
Reexamination Certificate
active
07991538
ABSTRACT:
In a fuel system of an internal combustion engine, the fuel quantity injected into a combustion chamber is a function of an activation period, during which a fuel injection device is activated. A pressure sensor detects the pressure in the fuel rail and provides a signal. The pressure in the fuel rail may be regulated to a setpoint pressure using a setting unit and employing the signal provided by the pressure sensor. The following method is provided for testing the fuel system:(a) establishing a test fuel quantity to be injected;(b) operating the internal combustion engine using a first setpoint pressure and a first activation period corresponding thereto and to the test fuel quantity to be injected;(c) detecting a speed- or torque-dependent variable characterizing the operating state;(d) operating the internal combustion engine using a second setpoint pressure and a second activation period corresponding thereto and to the test fuel quantity to be injected;(e) detecting a speed- or torque-dependent variable characterizing the operating state;(f) implementing an action if the variables detected in (c) and (e) differ by more than a limit value.
REFERENCES:
patent: 4614174 (1986-09-01), Tanigawa et al.
patent: 6311674 (2001-11-01), Igashira et al.
patent: 6557530 (2003-05-01), Benson et al.
patent: 7000600 (2006-02-01), Yamada et al.
Kriechbaum Christian
Meyer-Salfeld Steffen
Olbrich Stephan
Peck Rainer
Schenk Michael
Kenyon & Kenyon LLP
Robert & Bosch GmbH
Wolfe, Jr. Willis R
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