Method for controlling the current intensity of the electric current flowing through an inductive consumer and a corresponding circuit configuration
First Claim
1. A method for controlling a current intensity of an electric current flowing through an inductive consumer, the consumer being connected in series to a switching device and a current measuring unit, and in parallel to a freewheeling element, the method comprising:
- activating the switching device for adjusting the current intensity during a pulse width modulation period;
determining a mean load voltage to be set during the pulse width modulation period from an input current intensity with the aid of a first controller;
setting the mean load voltage during the pulse width modulation period with the aid of the switching device at the consumer;
supplying, to a model adapted to the consumer, one of the mean load voltage and a setpoint load voltage determined with the aid of a second controller from a predefined setpoint current intensity;
ascertaining the input current intensity from a difference between the predefined setpoint current intensity and a difference variable between an actual current intensity through the consumer and a model current intensity determined with the aid of the model;
determining the setpoint current intensity from a target current intensity and a superposition current intensity; and
determining the superposition current intensity from a superposition target current intensity with the aid of an inverted transfer function of a control loop made up of the first controller and the consumer.
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Accused Products
Abstract
A method is provided for controlling the current intensity of the electric current flowing through an inductive consumer, the consumer being connected in series to a switching device and a current measuring unit, and in parallel to a free-wheeling element, and the switching device being activated for adjusting the current intensity during a pulse width modulation period. It is provided that a mean load voltage to be set during the pulse width modulation period is determined from an input current intensity with the aid of a first controller, the mean load voltage being set in the pulse width modulation period with the aid of the switching device at the consumer, the mean load voltage or a setpoint load voltage determined with the aid of a second controller from a predefined setpoint current intensity being fed to a model adapted to the consumer, and the input current intensity being ascertained from the difference between the predefined setpoint current intensity and a difference variable between an actual current intensity through the consumer and a model current intensity determined with the aid of the model. A circuit configuration for implementing the method is also provided.
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Citations
10 Claims
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1. A method for controlling a current intensity of an electric current flowing through an inductive consumer, the consumer being connected in series to a switching device and a current measuring unit, and in parallel to a freewheeling element, the method comprising:
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activating the switching device for adjusting the current intensity during a pulse width modulation period; determining a mean load voltage to be set during the pulse width modulation period from an input current intensity with the aid of a first controller; setting the mean load voltage during the pulse width modulation period with the aid of the switching device at the consumer; supplying, to a model adapted to the consumer, one of the mean load voltage and a setpoint load voltage determined with the aid of a second controller from a predefined setpoint current intensity; ascertaining the input current intensity from a difference between the predefined setpoint current intensity and a difference variable between an actual current intensity through the consumer and a model current intensity determined with the aid of the model; determining the setpoint current intensity from a target current intensity and a superposition current intensity; and determining the superposition current intensity from a superposition target current intensity with the aid of an inverted transfer function of a control loop made up of the first controller and the consumer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit configuration, comprising:
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a control unit for controlling a current intensity of an electric current flowing through an inductive consumer; a switching device; a current measuring unit; a first controller; a second controller; and a freewheeling element, wherein; the consumer is connected in series to the switching device and the current measuring unit, and in parallel to the freewheeling element, the control unit activates the switching device for adjusting the current intensity during a pulse width modulation period, the control unit determines a mean load voltage to be set during the pulse width modulation period from an input current intensity with the aid of the first controller, the mean load voltage is set during the pulse width modulation period with the aid of the switching device at the consumer, one of the mean load voltage and a setpoint load voltage is determined with the aid of the second controller from a predefined setpoint current intensity being fed to a model adapted to the consumer, the input current intensity is ascertained from a difference between the predefined setpoint current intensity and a difference variable between an actual current intensity through the consumer and a model current intensity determined with the aid of the model, the setpoint current intensity is determined from a target current intensity and a superposition current intensity; and the superposition current intensity is determined from a superposition target current intensity with the aid of an inverted transfer function of a control loop made up of the first controller and the consumer.
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Specification