Data processing: generic control systems or specific application – Generic control system – apparatus or process – Optimization or adaptive control
Reexamination Certificate
1998-07-29
2001-05-01
Grant, William (Department: 2786)
Data processing: generic control systems or specific application
Generic control system, apparatus or process
Optimization or adaptive control
Reexamination Certificate
active
06226557
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a method for the closed-loop control of a controlled system.
A PID control method, which has proportional, integral and derivative (PID) action, for the closed-loop control of diesel injection is disclosed in European Patent Application No. 0 176 323 A2. In that case, the functioning of the PID control method is coordinated with a nonlinear engine function that is to be controlled. The consequence of this is that the PID control method can be used only for the engine function for which the PID control method has been tailored for.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a method for the closed-loop control of a controlled system, in particular of an internal combustion engine which overcomes the above-mentioned disadvantages of the prior art methods of this general type, in which simple adaptation to different controlled systems, in particular engine functions, is possible.
With the foregoing and other objects in view there is provided, in accordance with the invention, a method for the closed-loop control of a controlled system, which includes: determining a state variable of a controlled system; subtracting the state variable from a reference variable for deriving a first input value; subjecting the first input value to a proportional and integral control process for deriving an output value; subtracting the state variable from the output value for deriving a second input value; subjecting the second input value to a proportional and derivative control process for deriving an actuating value; weighting the actuating value with a correction value, the correction value chosen as a function of the state variable of the controlled system wherein the weighting of the actuating value with the correction value leads to a linear control action of the controlled system; and feeding the weighted actuating value to the controlled system.
An essential advantage of the invention is that the state variable of the controlled system is linearized and the linearized state variable is taken into account during the specification of a new actuating value.
In accordance with an added feature of the invention, there is the step of multiplying the actuating value by the correction value in the weighting step.
In accordance with an additional feature of the invention, there is the step of averaging the state variable over time before subtracting the state variable from the reference variable.
In accordance with another feature of the invention, there is the step of using the reference variable as a temporally delaying reference variable.
In accordance with a further added feature of the invention, there is the step of using the following function as the proportional and integral control process:
uo
(
k
)
=
uo
(
k
-
1
)
+
K0
*
[
eo
(
k
)
-
(
1
-
Ta
Tn
)
eo
(
k
-
1
)
]
,
where uo(k) represents the output value, eo(k) represents the first input value, K
0
represents a gain factor, Ta represents a sampling time and Tn represents an integral action time.
In accordance with a concomitant feature of the invention, there is the step of using the following function as the proportional and derivative control process:
ui
(
k
)
=
Ki
*
[
ei
(
k
)
-
Tv
Ta
(
ei
(
k
)
-
ei
(
k
-
1
)
)
]
,
where ui(k) designates the actuating value, ei(k) designates the second input value, Ki designates a second gain factor, Ta designates a sampling time and Tv designates a derivative action time.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a method for the closed-loop control of a controlled system, in particular of an internal combustion engine, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
REFERENCES:
patent: 4438496 (1984-03-01), Ohie
patent: 4882526 (1989-11-01), Iino et al.
patent: 5726880 (1998-03-01), Bailey et al.
patent: 5812428 (1998-09-01), Zou et al.
patent: 5829335 (1998-11-01), Ewald et al.
patent: 5847952 (1998-12-01), Samad
patent: 0 176 323 A2 (1986-04-01), None
patent: 2 111 253 (1983-06-01), None
Patent Abstracts of Japan No. 60-258607 (Kunihiko et al.), dated Dec. 20, 1985.
Hartke Andreas
Heinitz Dirk
Przymusinski Achim
Grant William
Greenberg Laurence A.
Hartman Jr. Ronald D
Lerner Herbert L.
Siemens Aktiengesellschaft
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