System for monitoring the tire pressure in vehicles
First Claim
1. System for monitoring the tire pressure in vehicles, comprisingtire pressure monitoring devices, which are each to be arranged in one of the pneumatic tires of the vehicle and comprise a pressure sensor, a roll sensor, a control unit, a power source and a transmitter,an evaluation unit for installing in the vehicle in a stationary manner comprising a receiver for evaluating data telegrams transmitted by the tire pressure monitoring devices, said data telegrams containing a pressure information and a characteristic identifier of the tire pressure monitoring device, wherebythe tire pressure monitoring devices transmit the data telegrams in first time intervals in a normal mode of operation, switch from the normal mode of operation to a pressure drop mode if an evaluation of pressure signals shows a pressure drop having a pressure drop speed exceeding a pre-defined threshold value and transmit data telegrams in the pressure drop mode in second time intervals, which are smaller than the first time intervals,the evaluation unit assigns the characteristic identifiers to the respective wheel positions at the beginning of the travel by means of a statistic evaluation of the reception level of data telegrams, andan activation of the roll sensor at the beginning of a travel causes the corresponding tire pressure monitoring devices to switch to a travel starting mode, in which data telegrams are sent in third time intervals, which are shorter than the first time intervals of the normal mode of operation,whereinthe tire pressure monitoring devices begin with the process of transmitting a data packet comprising several data telegrams after switching to the travel starting mode,it is checked, after the transmission of a first part of the data packet, if the roll sensor is still detecting a turning of the wheel, and if not, the process of transmission of the data packet is interrupted, wherebythe process of transmitting the data packet is continued further if the roll sensor is re-activated within a pre-defined time span, and the process of transmitting the data packet is started all over again if the roll sensor is re-activated only after the lapse of the pre-defined time span,and whereby the tire pressure monitoring devices switch to the normal mode of operation after complete transmission of a data packet.
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Accused Products
Abstract
Described is a procedure for controlling the transmission operation of a tire pressure monitoring device (1) arranged in a pneumatic tire of a vehicle, whereby data telegrams are transmitted in a normal mode of operation (13) in first time intervals, and there is a changeover from the normal mode of operation (13) to a pressure drop mode, if an inspection of the pressure signals indicates a drop in the pressure of a drop speed exceeding a pre-defined threshold value, and data telegrams are transmitted in the pressure drop mode in second time intervals, which are shorter than the first time intervals, and the tire pressure monitoring devices (1) are put into a travel starting mode (10, 11, 12) at the beginning of the travel by activation a roll sensor. Data telegrams are transmitted in the travel starting mode in shorter third time intervals as compared to the normal mode of operation.
According to the invention, after the changeover into the travel starting mode (10), the process of transmitting a data packet consisting of several data telegrams will start, and a check will be conducted at least once after transmitting the first part of a data packet to determine whether the roll sensor (1b) continues detecting a turning of the wheel (11), and if not, the process of transmission of the data packet will be interrupted (14), whereby the process of transmission of the data packet shall be resumed (12) if the roll sensor (1b) is re-activated within a pre-defined time span (tC1) and the process of transmission of the data packet shall be started all over again (10) if the roll sensor (1b) is re-activated only after the lapse of the pre-defined time span (tC1) and there is a changeover to the normal mode of operation (13) after the complete transmission of the data packet.
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Citations
12 Claims
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1. System for monitoring the tire pressure in vehicles, comprising
tire pressure monitoring devices, which are each to be arranged in one of the pneumatic tires of the vehicle and comprise a pressure sensor, a roll sensor, a control unit, a power source and a transmitter, an evaluation unit for installing in the vehicle in a stationary manner comprising a receiver for evaluating data telegrams transmitted by the tire pressure monitoring devices, said data telegrams containing a pressure information and a characteristic identifier of the tire pressure monitoring device, whereby the tire pressure monitoring devices transmit the data telegrams in first time intervals in a normal mode of operation, switch from the normal mode of operation to a pressure drop mode if an evaluation of pressure signals shows a pressure drop having a pressure drop speed exceeding a pre-defined threshold value and transmit data telegrams in the pressure drop mode in second time intervals, which are smaller than the first time intervals, the evaluation unit assigns the characteristic identifiers to the respective wheel positions at the beginning of the travel by means of a statistic evaluation of the reception level of data telegrams, and an activation of the roll sensor at the beginning of a travel causes the corresponding tire pressure monitoring devices to switch to a travel starting mode, in which data telegrams are sent in third time intervals, which are shorter than the first time intervals of the normal mode of operation, wherein the tire pressure monitoring devices begin with the process of transmitting a data packet comprising several data telegrams after switching to the travel starting mode, it is checked, after the transmission of a first part of the data packet, if the roll sensor is still detecting a turning of the wheel, and if not, the process of transmission of the data packet is interrupted, whereby the process of transmitting the data packet is continued further if the roll sensor is re-activated within a pre-defined time span, and the process of transmitting the data packet is started all over again if the roll sensor is re-activated only after the lapse of the pre-defined time span, and whereby the tire pressure monitoring devices switch to the normal mode of operation after complete transmission of a data packet.
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12. Method for controlling the transmission operation of a tire pressure monitoring device arranged in a pneumatic tire of a vehicle, whereby
data telegrams are transmitted in first time intervals in a normal mode of operation, the tire pressure monitoring device is switched from the normal mode of operation to a pressure drop mode, if an evaluation of pressure signals indicates a drop in pressure having a pressure drop speed exceeding a pre-defined threshold value, and data telegrams are transmitted in the pressure drop mode in second time intervals, which are shorter than the first, the tire pressure monitoring device is switched into a travel starting mode at the beginning of a travel by activation of a roll sensor, wherein data telegrams are sent in the travel starting mode in third time intervals that are shorter than the first time intervals, wherein the process of transmitting a data packet comprising several data telegrams is initiated by switching to the travel starting mode; -
it is checked at least once, after the transmission of a first part of the data packet, if the roll sensor continues detecting a turning of the wheel, and if not, the process of transmission of the data packet is interrupted, whereby the process of transmitting the data packet is continued further if the roll sensor is re-activated within a pre-defined time span, and the process of transmitting the data packet is started all over again if the roll sensor is re-activated only after the lapse of the pre-defined time span, and the tire pressure monitoring device switches to the normal mode of operation after the data packet has been completely sent.
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Specification