Method for measuring ultrasonically the fill level of a liquid
First Claim
1. A method for measuring a fill level of a liquid additive in a tank using an ultrasonic sensor, the method comprising the following steps:
- a) measuring a first propagation time of an ultrasonic signal from the ultrasonic sensor to a liquid level of the liquid additive;
b) cleaning at least one reference surface in the liquid additive by using at least one ultrasonic pulse;
c) measuring at least one second propagation time of an ultrasonic signal from the ultrasonic sensor to the at least one reference surface; and
d) calculating the fill level from the first propagation time and the second propagation time.
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Accused Products
Abstract
A method for measuring the fill level of a liquid additive in a tank using an ultrasonic sensor includes initially carrying out a measurement of a first propagation time of an ultrasonic signal from the ultrasonic sensor to a liquid level of the liquid additive. This is followed by cleaning of at least one reference surface in the liquid additive with the aid of at least one ultrasonic pulse. Then at least one second propagation time of an ultrasonic signal from the ultrasonic sensor to the at least one reference surface is measured and the fill level is calculated from the first propagation time and the second propagation time. A delivery unit having at least one ultrasonic sensor for installation in a liquid additive tank is also provided.
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Citations
11 Claims
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1. A method for measuring a fill level of a liquid additive in a tank using an ultrasonic sensor, the method comprising the following steps:
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a) measuring a first propagation time of an ultrasonic signal from the ultrasonic sensor to a liquid level of the liquid additive; b) cleaning at least one reference surface in the liquid additive by using at least one ultrasonic pulse; c) measuring at least one second propagation time of an ultrasonic signal from the ultrasonic sensor to the at least one reference surface; and d) calculating the fill level from the first propagation time and the second propagation time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring a fill level of a liquid additive in a tank using an ultrasonic sensor, the method comprising the following steps:
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a) measuring a first propagation time of an ultrasonic signal from the ultrasonic sensor to a liquid level of the liquid additive; b) cleaning at least one reference surface in the liquid additive by using at least one ultrasonic pulse; c) measuring at least one second propagation time of an ultrasonic signal from the ultrasonic sensor to the at least one reference surface; and d) calculating the fill level from the first propagation time and the second propagation time; after the at least one reference surface has been cleaned; carrying out a test measurement in step b) using an ultrasonic signal from the ultrasonic sensor in order to check if the cleaning was successful, and emitting another ultrasonic pulse for cleaning the at least one reference surface if the cleaning was unsuccessful.
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11. A delivery unit for installation in a tank for a liquid additive, the delivery unit comprising:
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at least one reference surface in the liquid additive; at least one ultrasonic sensor; and an electronics module for measuring a fill level of the liquid additive in the tank by using said at least one ultrasonic sensor, said electronics module being programmed to carry out the following steps; a) measuring a first propagation time of an ultrasonic signal from said at least one ultrasonic sensor to a liquid level of the liquid additive; b) cleaning said at least one reference surface by using at least one ultrasonic pulse; c) measuring at least one second propagation time of an ultrasonic signal from said at least one ultrasonic sensor to said at least one reference surface; and d) calculating the fill level from the first propagation time and the second propagation time.
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Specification