Patent Number: 7,784,881

Title: Method and circuit system for calibrating voltage and temperature deviations of the effective current of hydraulic valves in a PWM drive

Abstract: The present invention relates to a method for reducing deviations between the effective current and the measured current in a pulse-width-modulated current control, in particular for electronic brake control units of motor vehicles, wherein the measured current is determined at a certain predefined time within an actuation period and a compensation occurs by means of temperature-responsive and/or supply-voltage-responsive compensation variables which are added to the measured current such that a corrected nominal current is available for current control. The invention also relates to a circuit arrangement for actuating several inductive loads and comprises a circuit for PWM control of the load current. The method of the invention is implemented as a program in a microcomputer or microcomputer system that is electrically connected to the PWM circuit.

Inventors: Engelmann; Mario (Steinbach/Ts., DE), Oehler; Peter (Frankfurt am Main, DE)

Assignee: Continental Teves AG & Co. oHG

International Classification: B60T 8/36 (20060101); B60T 15/14 (20060101); B60T 8/66 (20060101)

Expiration Date: 8/31/12018