Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-04-01
2001-03-06
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S480000, C123S486000, C701S102000, C701S103000, C701S115000
Reexamination Certificate
active
06196196
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the selection of operating parameters of an internal combustion engine control dependent upon the run time of the engine.
BACKGROUND OF THE INVENTION
An arrangement for limiting rpm of an internal combustion engine is known from DE 28 00 433 wherein the permissible highest rpm is controllable in dependence upon a roadway signal and/or a time signal. This permits limiting the highest rpm during the run-in phase to comparatively low values without limiting the rpm spectrum useable for the full power development in the run-in state. The mentioned limitation is targeted to a protection of the engine against increased wear which can go as far as a destruction. An adaptation of control parameters to the wear of an engine is known from U.S. Pat. No. 4,181,944 in accordance with which the wear is detected via the combustion chamber pressure or is estimated from the signal of a distance counter.
Conventional controls of internal combustion engines provide for a plurality of operating parameters in the region of the air/fuel mixture formation and the ignition which influence the power, the consumption and the exhaust gas emissions. An example of such an engine control is described in the publication “Automotive Electric/Electronic Systems”, VDI Verlag, 1988, pages 262 to 303. In known systems, the determination of the operating parameters is orientated on the requirement of the engine which is not yet run in. That is, the sets of data are matched to the comparatively high friction power loss of a new engine.
SUMMARY OF THE INVENTION
The object of the invention is the further improvement of the known control of an internal combustion engine especially with a view to the fuel consumption and the toxic emissions.
The essence of the invention is to change the following data sets in dependence upon the run-in state of the engine: the driving performance, the exhaust-gas emission and especially the sets of data relevant to the consumption. Here, the run-in state can be advantageously modeled by data which are anyway present in the control of the engine or can be easily formed. Examples of such data are:
the sum of the ignitions since the original start, that is, since the first start of the engine after the manufacture thereof;
the sum of the operating times;
the travel distance covered;
the sum of the injection times;
the integral of the through-putted air mass during the operating time;
the integral of the throttle flap position; and,
the integral of the vehicle speed,
all of these quantities computed since the original start and/or the sum of the start operations of the engine which have taken place since the original start.
A consideration of the friction losses of the engine and therefore of the run time via evaluation of a start counter is especially advantageous because it is of little complexity.
Sets of data which are pertinent for continuous adaptation or stepped adaptation are the base values for the following:
fuel injection quantities;
factors for the transition compensation for acceleration operations, especially the
mixture enrichment factors for the restart and warm-running mixture enrichment. Additional examples are
data for the load-changing measures (which cause a jolt in the drive train) in mixture and ignition such as a reduction in torque by retarding the ignition. In addition, the application to
cold start relevant data of a diesel engine can also be pertinent. The latter includes especially the extent of the rpm increase as a function of engine temperature and/or a shift in injection start in the direction of earlier injection time points.
REFERENCES:
patent: 4074648 (1978-02-01), Reid et al.
patent: 4181944 (1980-01-01), Miyakawa et al.
patent: 4375207 (1983-03-01), Sieber et al.
patent: 4592331 (1986-06-01), Pouring
patent: 4770135 (1988-09-01), Jautelat et al.
patent: 5617836 (1997-04-01), Cullen et al.
patent: 5968107 (1999-10-01), Vogan et al.
patent: 1615763 (1990-12-01), None
Article from “Automotive Electric/Electronic Systems”, VDI Verlag, 1988, pp. 262 to 303.
Ehlers Guido
Gras Jurgen
Nusser Claus-Dieter
Ottesen Walter
Robert & Bosch GmbH
Vo Hieu T.
Yuen Henry C.
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