Load control in an internal combustion engine

Details Load control in an internal combustion engine Load control in an internal combustion engine

1999-12-06

2001-04-24

Denion, Thomas (Department: 3748)

Internal-combustion engines

Charge forming device

Supercharger

C060S600000, C060S601000, C060S602000, C060S603000

Reexamination Certificate

active

06220232

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method for automatically controlling the supercharging of an internal combustion engine, a manipulated variable being generated from the system deviation between a setpoint boost pressure and the actual boost pressure, a manipulated variable having at least one component provided by an integral-action controller, and a limiting value being predefined for the integral-action component, and being determined from a basic value that is dependent upon a plurality of operating parameters of the internal combustion engine, and a correction value superimposed thereon.
BACKGROUND OF THE INVENTION
A method of this kind is described in German Patent No. 195 02 250. The manipulated variable for the supercharger is composed of a proportional, a differential, and an integral-action component. The integral-action component is limited both in the steady-state and in the dynamic operation of the internal combustion engine. The limiting value of the integral-action component is composed of a basic value which is taken from characteristic curves as a function of operating parameters and a correction value superimposed upon the basic value. The correction value is adapted as a function of the charge-air temperature, the ambient pressure, and the speed of the internal combustion engine. Detailed information on the way of adapting the correction value cannot be gathered from German Patent No. 195 02 250.
SUMMARY OF THE INVENTION
An object of the present invention is to specify a method which enables a very sturdy automatic control of the supercharging of an internal combustion engine, particularly, if extremely variable disturbances appear, for example, heavily varying boost pressure setpoint values at full load or in the case of a highly variable speed dynamics.
The object of the present invention is achieved by adaptively determining the correction value as a function of the speed, a plurality of speed ranges being predefined. The adapted correction value is reduced stepwise if the system deviation is smaller than a threshold and if the integral-action component is smaller than the current limiting value. A stepwise increase in the adapted correction value occurs if the system deviation is greater than zero and if the integral-action component is equal to or greater than the current limiting value.
Using a correction value generated for the limiting value of the integral-action component in this manner, it is possible to avoid heavy overshoots during the boost pressure control, and still achieve a quick transient response of the controller. Especially, in very powerful vehicles, which are frequently driven in the dynamic operation, an excellent control response of the boost pressure control is achieved by the method according to the present invention because of its good adaptability of the limiting value for the integral-action component of the manipulated variable. Using the method of the present invention, tolerances in the control loop are reliably mastered.


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