Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1997-08-01
1998-11-10
Nelli, Raymond A.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123 25, 123 89, F02D 3100
Patent
active
058328971
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method and an arrangement for controlling an internal combustion engine according to the preambles of the independent claims.
SUMMARY OF THE INVENTION
In order to control a drive unit, such as an internal combustion engine, it is known from U.S. Pat. No. 5,558,178 to convert a desired value for a torque of the drive unit into a correction of the ignition angle, into suppressing individual cylinders or into metering fuel to individual cylinders and/or into influencing the air supply to the engine. Furthermore, it is known from U.S. Pat. No. 5,692,471 to influence additionally the air/fuel ratio to realize the pregiven torque value. Furthermore, in the known solutions, the actual engine torque is computed while considering the actual engine adjustment (with respect to charge, fuel metering and ignition angle). Engine rpm, engine load and, if required, the exhaust-gas composition are applied. Further variables, which can influence the efficiency of the engine, such as the temperature of the supplied air/fuel mixture in advance of ignition and/or the rate of the exhaust-gas quantity returned into the combustion chamber, are not considered. The computed actual torque is considered for converting the required engine torque into the ignition angle shift, fuel intervention and air intervention. For this reason, the known procedure can be too imprecise in some applications when setting the motor torque and/or computing the actual torque (which is also made available to other control units, for example, a drive slip control or a transmission control).
SUMMARY OF THE INVENTION
It is therefore an object of the invention to improve the precision of the known solutions.
From EP 112 494 A1 (U.S. Pat. No. 4,856,465), it is known to control the overlap times of the inlet and outlet valves of the cylinders of an internal combustion engine. The valve overlap times are adjusted via a shift of the camshaft with the shift being dependent upon engine rpm and engine load.
An exhaust-gas return system is known from "Bosch, Kraftfahrtechnisches Taschenbuch", 21st edition, 1991, pages 470 and 471. In this system, a pregiven exhaust-gas quantity is returned into the intake system of the engine downstream of the throttle flap by driving a control valve via an additional line. This external exhaust-gas return is to be distinguished from the above-mentioned internal exhaust-gas return with overlapping of the opening times of the inlet and outlet valves for which, likewise, certain exhaust-gas quantities are returned into the combustion chamber.
The accuracy with respect to the conversion of the desired engine torque into the control variables of the engine is improved by considering additional variables which influence the efficiency and therefore the engine torque generation of the engine, such as mixture temperature in advance of ignition and/or the rate of exhaust-gas return (internal as well as external).
Furthermore, a more precise torque computation is made available also for other control apparatus.
It is especially advantageous to consider, as additional variables, the mixture temperature in advance of ignition and/or the exhaust-gas return rate because these variables have a considerable influence on the efficiency and therefore on the torque of the engine.
It is further advantageous that the additional variables are included at a central location of the torque computation and torque conversion, namely, when determining the optimal ignition angle, that is, the ignition angle at which the engine develops its greatest efficiency. In this way, the optimization can be carried out by correcting a variable.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in greater detail with respect to the embodiments shown in the drawing.
FIG. 1 shows the basic structure of a control system for an internal combustion engine wherein a desired torque value is converted into control variables for the metering of fuel, the ignition angle, the air supply and/or the mixture co
REFERENCES:
patent: 4856465 (1989-08-01), Denz et al.
patent: 5115782 (1992-05-01), Klinke et al.
patent: 5183020 (1993-02-01), Hosoi
patent: 5284116 (1994-02-01), Richeson et al.
patent: 5558178 (1996-09-01), Hess et al.
"Automotive Handbook", Bosch, 3rd Edition, pp. 470 and 471.
Patent Abstracts of Japan, vol. 12, No. 336 (M-739), Sep. 1988.
Nelli Raymond A.
Ottesen Walter
Robert & Bosch GmbH
LandOfFree
Method and arrangement for controlling an internal combustion en does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and arrangement for controlling an internal combustion en, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and arrangement for controlling an internal combustion en will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1506964