Sensorless Measurement of Positioning Travel, Especially on an Electromotively Operated Parking Brake
AssigneeLucas Automotive GmbH
InventorsChristoph Linden, Michael Keller
Life of this patent
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Abstract
The invention relates to a method for establishing the position of an actuating unit which is operated by an electric motor, in which a motor speed is determined from a motor model, the speed is integrated over a period of time and the position of the actuating unit is determined by multiplying the result of the integration by a proportionality factor. The motor model takes account of afterrunning of the electric motor at the instant of switch-off. The invention also relates to actuating units, brakes, pumps and transmissions for which the method can be used.
Claims16
Method for establishing a position of an actuating unit which is operated by an electric motor, comprising the steps:
- determining a motor speed from a motor model that takes account or afterrunning of the electric motor;
- integrating the motor speed over a period of time;
- and
- establishing the position of the actuating unit by multiplying the result of the integration by a proportionality factor.
Computer program product, which comprises program codes for executing the following steps for establishing the position of an actuating unit operated by an electric motor:
- determining a motor speed from a motor model that takes account or afterrunnning of the electric motor:
- and
- determining the travel completed by the actuating unit by integrating the motor speed over a period of time and multiplying it by a proportionality factor.
Actuating device, comprising:
- an electric motor,
- an actuating unit, which is operated by the electric motor,
- a memory unit,
- a processor, and
- a memory unit that comprises program codes for executing the following steps for establishing the position of the actuating unit operated by the electric motor:
- determining a motor speed from a motor model that takes account or afterrunnning of the electric motor, and
- determining a travel completed by the actuating unit by integrating the motor speed over a period of time and multiplying it by a proportionality factor.
Dependencies are inferred from the claim text.