Process and circuit for monitoring tire pressure
First Claim
1. Process for monitoring tire pressure by measuring, comparing and evaluating the rotating speeds of the individual wheels of the vehicle, wherein speed correction factors are formed for the individual wheels of the vehicle in a learning phase according to a learning process, characterized in thatthe speed correction factors are values which, multiplied by the respective wheel speed, yield a basic speed,correlations between the correction factors for typical travel situations are determined, andtolerances as a function of the respective travel situation are determined for the correction factors;
- the deviations of the correction factors from the learned values are determined and evaluated in an identification phase, taking into account the travel situation-dependent tolerances and the progression of the learning process, andloss of tire pressure is signaled when the current correction factor for a wheel becomes smaller, taking into account the current deviation, than the speed correction factor already determined for the wheel in question for the current travel situation during the learning phase, taking into account the tolerance already determined for the current travel situation during the learning phase.
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Accused Products
Abstract
A process for monitoring tire pressure by comparing and evaluating the rotating speeds of the individual wheels of the vehicle which is based on the formation of speed correction factors. The values of the individual correction factors, correlations between the correction factors for typical travel situations, and tolerances for the correction factors, which depend on the actual travel situation, are determined during a learning phase (i.e. phase 1). The deviations of the correction factors from the learned values are determined and evaluated during a subsequent identification phase (i.e. phase 2), taking into account the travel situation-dependent tolerances and the progression of the learning process. Loss of tire pressure is signaled when the current speed correction factor determined for a wheel during the identification phase becomes smaller, taking into account the current deviation, than the speed correction factor already learned, taking into account the tolerance already determined for the current travel situation.
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Citations
14 Claims
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1. Process for monitoring tire pressure by measuring, comparing and evaluating the rotating speeds of the individual wheels of the vehicle, wherein speed correction factors are formed for the individual wheels of the vehicle in a learning phase according to a learning process, characterized in that
the speed correction factors are values which, multiplied by the respective wheel speed, yield a basic speed, correlations between the correction factors for typical travel situations are determined, and tolerances as a function of the respective travel situation are determined for the correction factors; -
the deviations of the correction factors from the learned values are determined and evaluated in an identification phase, taking into account the travel situation-dependent tolerances and the progression of the learning process, and loss of tire pressure is signaled when the current correction factor for a wheel becomes smaller, taking into account the current deviation, than the speed correction factor already determined for the wheel in question for the current travel situation during the learning phase, taking into account the tolerance already determined for the current travel situation during the learning phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A circuit for monitoring the tire pressure of the wheels of a vehicle comprising:
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means for developing indications of the wheel speed of the individual wheels of the vehicle; a travel situation recognition circuit for developing an indication of the travel situation of the vehicle; a low-pass filter circuit responsive to said wheel speed indications and said travel situation indication for forming speed correction factors, said low-pass filter having an attenuation characteristic which is variable as a function of said travel situation indication; means responsive to said travel situation indication for determining travel situation-dependent tolerances; and means for determining travel situation-dependent deviations of said speed correction factors.
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Specification