Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2000-10-12
2002-09-10
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S458000
Reexamination Certificate
active
06446605
ABSTRACT:
BACKGROUND INFORMATION
A method and a device for controlling an internal combustion engine are described in German Patent No. 195 48 278. It describes a method and a device for regulating the pressure in an accumulator of a common rail system (CR system). It is customary in such CR systems to stipulate the time period that the injectors are driven as a function of the fuel quantity to be injected and of the pressure prevailing in the accumulator. The pressure in the accumulator is measured in synchronism with rotational speed. The pressure is regulated within a fixed time grid by sampling the rail pressure, just been measured in synchronism with the speed, in synchronism with time as well.
Furthermore, it is known from German Patent No. 197 35 561 to sample the pressure values in fixed time intervals. In the control of injected fuel quantities, accurate quantity values are derived only when the fuel pressure is known during injection. Imprecise pressure measurements can lead to a quantity error and, thus, to degraded emissions performance of the internal combustion engine.
SUMMARY OF THE INVENTION
Given a method and a device for controlling an internal combustion engine, an underlying object of the present invention is to reduce the quantity errors and thereby improve the emissions characteristics of the internal combustion engine.
REFERENCES:
patent: 5241933 (1993-09-01), Morikawa
patent: 5445129 (1995-08-01), Barnes
patent: 5531111 (1996-07-01), Okamoto et al.
patent: 5609136 (1997-03-01), Tuken
patent: 6311669 (2001-11-01), Przymusinski et al.
patent: 195 48 278 (1997-06-01), None
patent: 197 35 561 (1999-02-01), None
patent: 2328295 (1999-02-01), None
Fehrmann Ruediger
Kellner Andreas
Argenbright Tony M.
Gimie Mahmoud
Kenyon & Kenyon
Robert & Bosch GmbH
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