Method for determining a filling level of a fluid tank in a motor vehicle
First Claim
1. A method for determining a filling level of a fluid tank in a motor vehicle, the method comprising:
- performing a first calculation of a fluid volume of the fluid tank with a first process, the first process including;
detecting an ascent or a descent of the motor vehicle with multiple pieces of position data ascertained in succession via a position determination system,ascertaining a grade of an associated route section in each case for the ascertained position data,selecting at least two route sections having different grades, ascertaining a measuring value of a filling level sensor to be expected for each of them, and obtaining a measured measuring value for each of them from the filling level sensor situated in the fluid tank, andperforming a plausibility check of the measured measuring values of the filling level sensor via a comparison of the measuring values to be expected with the measured measuring values of the filling level sensor, wherein the first calculation of the fluid volume is based on the plausibility check;
displaying on a display device an indication of the filling level to a driver of the motor vehicle based on the calculated fluid volume of the fluid tank; and
preventing a restarting of the motor vehicle based on the calculated fluid volume of the fluid tank;
wherein the fluid tank is a urea-water solution tank.
1 Assignment
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Accused Products
Abstract
A method for determining a filling level of a fluid tank in a motor vehicle, enables both a detection of an ascent or a descent of the motor vehicle with the aid of multiple pieces of position data ascertained in succession via a position determination system, and a plausibility check of the measuring value of the filling level sensor, in that a grade of an associated route section is ascertained for the ascertained position data, a selection of at least two route sections having different grades is carried out, and a measuring value of the filling level sensor to be expected is ascertained for each of them, and a comparison of the measuring values to be expected with the measured measuring values is carried out.
10 Citations
16 Claims
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1. A method for determining a filling level of a fluid tank in a motor vehicle, the method comprising:
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performing a first calculation of a fluid volume of the fluid tank with a first process, the first process including; detecting an ascent or a descent of the motor vehicle with multiple pieces of position data ascertained in succession via a position determination system, ascertaining a grade of an associated route section in each case for the ascertained position data, selecting at least two route sections having different grades, ascertaining a measuring value of a filling level sensor to be expected for each of them, and obtaining a measured measuring value for each of them from the filling level sensor situated in the fluid tank, and performing a plausibility check of the measured measuring values of the filling level sensor via a comparison of the measuring values to be expected with the measured measuring values of the filling level sensor, wherein the first calculation of the fluid volume is based on the plausibility check; displaying on a display device an indication of the filling level to a driver of the motor vehicle based on the calculated fluid volume of the fluid tank; and preventing a restarting of the motor vehicle based on the calculated fluid volume of the fluid tank; wherein the fluid tank is a urea-water solution tank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A non-transitory computer readable medium having a computer program, which is executable by a processor, comprising:
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a program code arrangement having program code for determining a filling level of a fluid tank in a motor vehicle, by performing the following; performing a first calculation of a fluid volume of the fluid tank with a first process, the first process including; detecting an ascent or a descent of the motor vehicle with multiple pieces of position data ascertained in succession via a position determination system, ascertaining a grade of an associated route section in each case for the ascertained position data, selecting at least two route sections having different grades, ascertaining a measuring value of a filling level sensor to be expected for each of them, and obtaining a measured measuring value for each of them from the filling level sensor situated in the fluid tank, and performing a plausibility check of the measured measuring values of the filling level sensor via a comparison of the measuring values to be expected with the measured measuring values of the filling level sensor, wherein the first calculation of the fluid volume is based on the plausibility check; displaying on a display device an indication of the filling level to a driver of the motor vehicle based on the calculated fluid volume of the fuel tank; and preventing a restarting of the motor vehicle based on the calculated fluid volume of the fluid tank; wherein the fluid tank is a urea-water solution tank. - View Dependent Claims (13, 14)
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15. An electronic control unit, comprising:
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a processor configured to determine a filling level of a fluid tank in a motor vehicle, by performing the following; performing a first calculation of a fluid volume of the fluid tank with a first process, the first process including; detecting an ascent or a descent of the motor vehicle with multiple pieces of position data ascertained in succession via a position determination system, ascertaining a grade of an associated route section in each case for the ascertained position data, selecting at least two route sections having different grades, and ascertaining a measuring value of a filling level sensor to be expected for each of them, and obtaining a measured measuring value for each of them from the filling level sensor situated in the fluid tank, and performing a plausibility check of the measured measuring values of the filling level sensor via a comparison of the measuring values to be expected with the measured measuring values of the filling sensor, wherein the first calculation of the fluid volume is based on the plausibility check; displaying on a display device an indication of the filling level to a driver of the motor vehicle based on the calculated fluid volume of the fluid tank; and preventing a restarting of the motor vehicle based on the calculated fluid volume of the fluid tank; wherein the fluid tank is a urea-water solution tank. - View Dependent Claims (16)
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Specification