Continental Teves, Ag and Company Ohg

Axel Schmitz

Wolfgang Fey

Mario Engelmann

Micha Heinz

Frank Michel

Peter Oehler

Dirk Morschel

Wolfgang Joeckel

Markus Jäger

Jürgen Müller

A method for pulse-modulated current control of an inductive load current. A first operating mode is implemented when a change in current setpoint value is effected. An initial duty cycle of the pulse modulation is determined and used to operate the inductive load in a second operating mode. In the first operating mode, a switching state of at least one switching element is set depending on whether a current setpoint value of the load current is higher or lower than a current setpoint value of a directly preceding cycle. The switching state is retained until a current limit value is reached and then switched over. The switching state of the switching element is switched over multiple times to generate a prescribed number of periods, and the duty cycle of the pulse modulation is determined based on at least a portion of the prescribed number of periods.

Method for controlling the current of an inductive load

Method in which the current is measured inside an integrated PWM control circuit using at least one A/D converter which is likewise integrated in the circuit is described. The PWM controller is provided for the purpose of driving inductive loads and is arranged, in particular, in an electronic circuit of an electronic controller for a motor vehicle braking system. Before determining the actual current of the PWM controller, which is determined using the at least one A/D converter, the current is smoothed using a low-pass filter. A circuit arrangement for carrying out the above method and its use in electronic motor vehicle control systems is also described herein.

Method and pulse-width-modulated current control circuit for driving inductive loads in motor vehicles

The invention relates to an electronic motor vehicle control system having at least one valve actuating circuit which controls a load current by means of pulse width modulation. The actuating circuit has at least one electronic current measuring circuit which has at least one measurement path with at least one analog/digital converter. The analog/digital converts an analog measurement signal of the load current into a digital measurement signal of the load current and is actuated or designed in such a way as to carry out a plurality of current measurements per PWM period. The at least one measurement path of the current measurement circuit has a signal conservation circuit which provides the analog measurement signal of the load current substantially unchanged, and independent of the actual load current, for at least a defined hold time (t, t).

Electronic motor vehicle control system with current measuring circuit

An electronic controller for motor vehicle control systems having at least one valve actuation circuit is described herein. The electronic controller uses pulse width modulation to control the load current (i) flowing through an essentially inductive load (L), and has at least one electronic current measuring circuit which has at least one analog/digital converter which converts an analog measurement signal for the load current (i) into a digital measurement signal for the load current (i). The at least one analog/digital converter is a sigma-delta modulator. A method for measuring current using sigma-delta modulation and to the use of the electronic controller in a motor vehicle brake system is also described herein.

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Hattersheim, Germany

Axel Schmitz