Method and device for the calibration or diagnosis of a motor vehicle brake system having a cyclically operated pump
First Claim
1. A method for the calibration or diagnosis of a motor vehicle brake system having an operating pump operating in a pulsed fashion during which a pulse period for applying voltage to the operating pump and an interpulse period for not applying voltage to the operating pump are alternated, the method comprising:
- repeatedly determining, by a reference processor, during operation of a reference pump separate from the motor vehicle, under defined stipulations, at least a voltage (URPoff) generated by the reference pump during the interpulse period and representing the electromotive force of the reference pump;
deriving, by the reference processor, a statistical characteristic variable (URPOff) from the voltage (URPoff);
determining, by an operating processor, during operation of the operating pump in the motor vehicle, a voltage (UBPOff) generated by the operating pump during the interpulse period and representing the electromotive force of the operating pump under corresponding stipulations;
deriving, by the operating processor, a corresponding statistical characteristic variable (UBPOff) from the voltage (UBPOff);
calculating, by the operating processor, at least one ratio as a measure of the deviation of the operating behavior of the operating pump from the operating behavior of the reference pump from the characteristic variable (URPOff) and the characteristic variable (UBPOff); and
determining, by the operating processor, if the operating pump in the motor vehicle is defective by comparing the at least one ratio to a tolerance range.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for the calibration or diagnosis of a motor vehicle brake system having a cyclically operated pump. At least one parameter (URPOff), representing the electromotor force of the reference pump, is repeatedly ascertained during operation of a reference pump under defined guidelines. A statistical characteristic variable (URPOff) is derived from the values of parameter (URPOff) ascertained for the reference pump. Parameter (UBPOff) is ascertained under a corresponding guideline during operation of an operating pump. Corresponding statistical characteristic variable (UBPOff) is derived from the values of parameter (UBPOff) ascertained for the operating pump. At least one ratio number is calculated as a measure of the deviation of the operating behavior of the operating pump from the operating behavior of the reference pump from the characteristic variable (URPOff) calculated for the reference pump and the characteristic variable (UBPOff) calculated for the operating pump.
42 Citations
14 Claims
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1. A method for the calibration or diagnosis of a motor vehicle brake system having an operating pump operating in a pulsed fashion during which a pulse period for applying voltage to the operating pump and an interpulse period for not applying voltage to the operating pump are alternated, the method comprising:
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repeatedly determining, by a reference processor, during operation of a reference pump separate from the motor vehicle, under defined stipulations, at least a voltage (URPoff) generated by the reference pump during the interpulse period and representing the electromotive force of the reference pump; deriving, by the reference processor, a statistical characteristic variable (URPOff) from the voltage (URPoff); determining, by an operating processor, during operation of the operating pump in the motor vehicle, a voltage (UBPOff) generated by the operating pump during the interpulse period and representing the electromotive force of the operating pump under corresponding stipulations; deriving, by the operating processor, a corresponding statistical characteristic variable (UBPOff) from the voltage (UBPOff); calculating, by the operating processor, at least one ratio as a measure of the deviation of the operating behavior of the operating pump from the operating behavior of the reference pump from the characteristic variable (URPOff) and the characteristic variable (UBPOff); and determining, by the operating processor, if the operating pump in the motor vehicle is defective by comparing the at least one ratio to a tolerance range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for the calibration or diagnosis of a motor vehicle brake system having an operating pump operating in a pulsed fashion during which a pulse period for applying voltage to the operating pump and an interpulse period for not applying voltage to the operating pump are alternated, the device comprising:
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a reference processor configured to; repeatedly determine during operation of a reference pump separate from the motor vehicle, under defined stipulations, at least a voltage (URPOff) generated by the reference pump during the interpulse period and representing the electromotive force of the reference pump; derive a statistical characteristic variable (URPOff) from the voltage (URPOff); an operating processor configured to; determine during operation of the operating pump in the motor vehicle, a voltage (UBPOff) generated by the operating pump during the interpulse period and representing the electromotive force of the operating pump under corresponding stipulations; derive a corresponding statistical characteristic variable (UBPOff) from the voltage (UBPOff); calculate at least one ratio as a measure of the deviation of the operating behavior of the operating pump from the operating behavior of the reference pump from the characteristic variable (URPOff) and the characteristic variable (UBPOff); and determine if the operating pump in the motor vehicle is defective by comparing the at least one ratio to a tolerance range.
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Specification