Method for operating a system in which a manipulated variable of an actuator element can be controlled
AssigneeRobert Bosch GmbH
InventorsThomas Breitbach, Jens Pawlak
Life of this patent
Estimating the term…
Abstract
A method (10) is described for operating a system (12), for example a hydraulic or pneumatic system (12), in which a manipulated variable of an actuator element (16) can be controlled, and in which at least one variable (26) which is dependent on the manipulated variable of the actuator element (16) can be determined, wherein the manipulated variable of the actuator element (16) is modulated with a first periodic signal (22), and wherein a measurement signal (30) which characterizes the at least one variable (26) is evaluated using at least one second periodic signal (47).
Claims21
A method (10) for operating an electronic control device (32) of a system (12) of an internal combustion engine in which a through-flow cross section of a valve is modified by an actuator element (16), and in which at least one variable (26) which is dependent on the through-flow cross section of the actuator element (16) is sensed via a sensor, the method comprising:
- modulating, with a first periodic signal (22), the through-flow cross section of the valve;
- generating, based on a measurement of the sensor, a measurement signal (30) which characterizes the at least one variable (26);
- generating a second periodic signal (47) derived from the measurement signal (30) by means of a phase locked loop (49), the second periodic signal (47) having been modified to have a phase difference of zero from the measurement signal (30);
- providing the measurement signal (30) and the second periodic signal (47) to a multiplier which multiplies the measurement signal (30) and the at least one second periodic signal (47) and outputs a product (50) of the measurement signal (30) and the at least one second periodic signal (47);
- and
- detecting, via the evaluation unit, that there is a fault within the actuator element (16) based on an evaluation of the product (50).
A control device for an internal combustion engine (15) of a motor vehicle having an internal combustion engine in which a through-flow cross section of a valve is modified by an actuator element (16), and in which at least one variable (26) which is dependent on the through-flow cross section of the actuator element (16) is sensed via a sensor, the control device configured to:
- modulate, with a first periodic signal (22), the through-flow cross section of the valve;
- generate, based on a measurement of the sensor, a measurement signal (30) which characterizes the at least one variable (26);
- generate a second periodic signal (47) derived from the measurement signal (30) by means of a phase locked loop (49), the second periodic signal (47) having been modified to have a phase difference of zero from the measurement signal (30);
- provide the measurement signal (30) and the second periodic signal (47) to a multiplier which multiplies the measurement signal (30) and the at least one second periodic signal (47) and outputs a product (50) of the measurement signal (30) and the at least one second periodic signal (47);
- and
- detect, via the evaluation unit, that there is a fault within the actuator element (16) based on an evaluation of the product (50).
Dependencies are inferred from the claim text.