Process for driving electric, current-controlled actuators
AssigneeZF Friedrichshafen AG
InventorsHans-Jurgen Ege, Gunther Horsak, Peter Wiggermann
Life of this patent
Estimating the term…
Abstract
The process has an open control loop which detects the total current intensity of actuators and supplies it to a microprocessor. In a modulation mode the microprocessor successively generates at its output a modulated set value signal for each actuator, the set value signals lying below the response level of the process. The microprocessor then determines compensation values from the total current signal with which the set values of the actuators are corrected. The (regulating) speed of a control is thus combined with the accuracy of a regulation. The hardware expenditure (costs) is minimized thanks to the total current detection instead of the individual current detection.
Claims2
A process for driving electric current-controlled actuators (5) using a microprocessor (1) having at least one memory for storing data, performance characteristics and flow programs relevant to said process;
- said process comprising the steps of:
- inputting at least one of an adjusting signal (2) and a current signal (3) to said microprocessor (1) to be processed according to logical rules;
- issuing modulated set values for said actuators, during intermediate time periods between sequential inputs of said adjusting signals to said microprocessor (1) in accordance with a modulation program, said modulated set values being below a response level for said actuators;
- measuring current intensities of said actuators (5), from said current signal input to said microprocessor, to determine interference levels;
- determining, using said modulation program, compensation values due to current changes caused by said interference levels;
- storing said compensation values temporarily in said at least one memory;
- and
- issuing set values for said actuators upon inputting a further said adjusting signal to said microprocessor, said set values being adjusted by a last of said stored compensation values.
Dependencies are inferred from the claim text.