Control device and method for controlling
View Patent ↗The invention relates to a control device and to a method for controlling an automated clutch, which includes a hydraulic clutch actuating system, which has a hydrostatic actuator, which is driven by and electric-motor actuating drive having an incremental displacement sensor in such a way that the actuator moves in a translatable manner. The invention includes an absolute displacement sensor, which detects the actuator position.
1. A control device for controlling an automated clutch, comprising:
a hydraulic clutch actuating system having:
a master cylinder including a master piston and a piston rod;
a threaded spindle engaged with the piston rod;
an actuator arranged to displace the threaded spindle in a longitudinal direction to displace the piston rod in the longitudinal direction;
an electric motor actuating drive arranged to provide an actuating force to displace the actuator in the longitudinal direction, and including an incremental displacement sensor;
an absolute displacement sensor, separate from the incremental displacement sensor, and arranged to measure a position of the actuator; and,
a control device configured to control a position of the actuator by combining:
a first signal corresponding to a previously detected position of the actuator;
a second signal corresponding to position increments from the incremental displacement sensor; and,
a third signal from the absolute displacement sensor.
2. The control device recited in claim 1 , wherein the electric-motor actuating drive is embodied as an electronically commutated DC motor.
3. The control device recited in claim 1 , wherein the electric-motor actuating drive is embodied as an electronically commutated DC motor and is coupled to the actuator via the threaded spindle.
4. A method for controlling an automated clutch including an electric motor with an incremental displacement sensor, a master cylinder with a master piston and a piston rod, an actuator engaged with the piston rod, a threaded spindle engaged with the piston rod, an absolute displacement sensor, and a control system, comprising:
displacing the actuator with the electric motor;
rotating the threaded spindle with the actuator;
displacing the threaded spindle in a longitudinal direction;
displacing the piston rod in the longitudinal direction with the threaded spindle;
detecting a relative position of the actuator using the incremental displacement sensor;
detecting an absolute position of the actuator using the absolute displacement sensor;
combining, with the control system:
a first signal corresponding to a previously detected position of the actuator;
a second signal corresponding to position increments from the incremental displacement sensor; and,
a third signal from the absolute displacement sensor; and,
controlling, with the control system and the combined first, second, and third signals, a position of the actuator.
5. The method recited in claim 4 , wherein the second and third signals are superimposed in a position model in such a way that a small-signal behavior and adjusting movements in a short period of time are dominated by a high-resolution incremental displacement measurement of the incremental displacement sensor.
6. The method recited in claim 5 , wherein an absolute displacement measurement of lower resolution taken by the absolute displacement sensor is used as a reference measure for a large-signal behavior.
7. The method recited in claim 4 , wherein a position increment of the incremental displacement sensor is converted into a displacement difference with the aid of a scaling factor and wherein the displacement difference is added to a currently determined actuator position with the aid of a scaling factor.
8. A method for controlling an automated clutch including an electric motor with an incremental displacement sensor, a master cylinder with a master piston and a piston rod, an actuator engaged with the piston rod, a threaded spindle engaged with the piston rod, an absolute displacement sensor, and a control system, comprising:
displacing the actuator with the electric motor;
rotating the threaded spindle with the actuator;
displacing the threaded spindle in a longitudinal direction;
displacing the piston rod in the longitudinal direction with the threaded spindle;
detecting a relative position of the actuator using the incremental displacement sensor;
detecting an absolute position of the actuator using the absolute displacement sensor;
generating a first signal by subtracting a second signal corresponding to a control variable for the actuator from a third signal from the absolute displacement sensor;
forming the control variable by combining, with the control system:
the first signal;
a fourth signal corresponding to a previously detected position of the actuator; and,
a fifth signal corresponding to position increments from the incremental displacement sensor; and,
controlling, with the control system and the combined first, second, and third signals, a position of the actuator.