Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Reexamination Certificate
2000-01-25
2001-07-17
Lo, Weilun (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
C251S129010, C251S129160
Reexamination Certificate
active
06260521
ABSTRACT:
The invention relates to a method for controlling the supply of electrical energy to at least one electromagnetic device serving to activate a gas exchange valve. Furthermore, the invention relates to the use of a sliding mode controller.
WO 92-02712 discloses a control device in which a measured position value of a gas exchange valve of a combustion engine is compared with a desired position (predetermined in dependence on the operating parameters of the combustion engine). Depending on the deviation of the measured position value from the desired position, an electromagnetic device assigned to the gas exchange valve is driven in such a way that the movement profile of the gas exchange valve is approximated to the desired profile that has been determined.
The operation of combustion engines with electromagnetically activated gas exchange valves has shown that the possibilities for the open-loop or closed-loop controller devices which are known in this connection are limited for example with regard to the minimization of the (capture) velocities at the upper and lower end positions of the gas exchange valve, the minimization of the energy needed to activate the gas exchange valve, the reduction of the duration of the opening and closing movements, the realization of different movement profiles, the stabilization of the control, the minimization of the evolution of noise and/or the compensation of inaccuracies on account of production tolerances, wear or temperature influences.
The present invention is thus based on the object of proposing a control device for supplying energy to an electromagnetic device for activating a gas exchange valve by means of which the reliable approximation of predetermined opening and closing movements of the gas exchange valve and/or the fixing thereof in end positions can be realized.
SUMMARY OF THE INVENTION
The object is achieved according to the invention by means of comparison of the measured movement signal or of a signal generated from the movement signal with a desired signal by forming a differential signal. Forming a differential signal in this way is possible in a simple manner. If appropriate, the signal generated from the movement signal is, by way of example, a differentiated movement signal, a multiplicity of different methods being known from control technology for carrying out the differentiation. The differential signal is subsequently subjected to sliding mode control, by means of which the control aim, for example optimization of the movement path of the gas exchange valve, minimization of the energy supplied to the electromagnetic device, and/or minimization of noise, is possible in a simple, efficient and/or cost-effective manner.
A further proposal according to the invention is characterized by transferring knowledge about sliding mode control to the control of the supply of electrical energy to an electromagnetic device for activating a gas exchange valve. This opens up a multiplicity of new possibilities of controller configuration as well as new control strategies and control aims.
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Calcaterra Mark P.
Daimler-Chrysler AG
Lo Weilun
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