Method for detecting a blocked state of an ultrasonic sensor, ultrasonic sensor device, and motor vehicle
First Claim
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1. A method for detecting a blocked state of an ultrasonic sensor of a motor vehicle, the method comprising:
- sensing an actual value of at least one oscillation parameter of the ultrasonic sensor;
detecting a current temperature to which the ultrasonic sensor is exposed by a temperature detecting device, wherein the current temperature is detected by a temperature sensor of the temperature detection device disposed on and/or in the ultrasonic sensor;
determining, by the evaluation unit, a reference value as a function of the current temperature;
repeatedly comparing, by an evaluation unit, the actual value sensed with the reference value to generate a plurality of deviations of the actual value from the reference value;
determining, subsequent to generating the plurality of deviations, a mean value of the plurality of deviations;
detecting, based on the mean value of the plurality of deviations, the blocked state of the ultrasonic sensor; and
determining, based on the mean value of the plurality of deviations, an extent and/or a type of blockage of the ultrasonic sensor.
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Abstract
The invention relates to a method for detecting a blocked state of an ultrasonic sensor (3) of a motor vehicle (1), wherein an actual value of at least one oscillation parameter (fR) of the ultrasonic sensor (3) is sensed and is compared with a reference value by means of an evaluation unit (4) in order to detect a blocked state, wherein a current temperature (T) to which the ultrasonic sensor (3) is exposed is detected by means of a temperature detecting device (8), and the reference value is determined as a function of the current temperature (T) by means of the evaluation unit (4).
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Citations
9 Claims
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1. A method for detecting a blocked state of an ultrasonic sensor of a motor vehicle, the method comprising:
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sensing an actual value of at least one oscillation parameter of the ultrasonic sensor; detecting a current temperature to which the ultrasonic sensor is exposed by a temperature detecting device, wherein the current temperature is detected by a temperature sensor of the temperature detection device disposed on and/or in the ultrasonic sensor; determining, by the evaluation unit, a reference value as a function of the current temperature; repeatedly comparing, by an evaluation unit, the actual value sensed with the reference value to generate a plurality of deviations of the actual value from the reference value; determining, subsequent to generating the plurality of deviations, a mean value of the plurality of deviations; detecting, based on the mean value of the plurality of deviations, the blocked state of the ultrasonic sensor; and determining, based on the mean value of the plurality of deviations, an extent and/or a type of blockage of the ultrasonic sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An ultrasonic sensor device for a motor vehicle, comprising:
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at least one ultrasonic sensor; and an evaluation unit for; detecting an actual value of at least one oscillation parameter of the ultrasonic sensor, repeatedly comparing said actual value with a reference value to generate a plurality of deviations of the actual value from the reference value, determining, subsequent to generating the plurality of deviations, a mean value of the plurality of deviations, and detecting, based on the mean value of the plurality of deviations, a blocked state of the ultrasonic sensor, and determining, based on the mean value of the plurality of deviations, an extent and/or a type of blockage of the ultrasonic sensor, wherein the evaluation unit is designed for determining, during operation, the reference value as a function of a detected current temperature to which the ultrasonic sensor is exposed, wherein the detected current temperature is detected by a temperature sensor of a temperature detection device disposed on and/or in the ultrasonic sensor. - View Dependent Claims (9)
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Specification