Tire pressure monitoring device
First Claim
1. A tire pressure monitoring device for a vehicle having several wheels, wherein each wheel is provided with a pneumatic tire, comprising:
- a signal generating device at each wheel sensing the air pressure within the pneumatic tire and providing corresponding electric pressure signals;
a receiving antenna per wheel arranged stationarily at the vehicle structure adjacent to the wheel, and being connected via a distinctive connecting line with a single receiver;
a switch being inserted into each connecting line;
a transmitter at each wheel generating a radiogram comprising at least a synchronizing signal and control signals corresponding at least to the electric pressure signals for telemetric transmission of said radiogram to said receiving antennas;
said single receiver;
sensing a field strength of the synchronizing signal of each specific radiogram,selecting said specific receiving antenna having the highest field strength of a received radiogram during a specific time interval, andattributing the specific radiogram to said specific wheel being arranged adjacent to said receiving antenna comprising the highest field strength of the received radiogram during said specific time interval;
a central evaluation means coupled with said single receiver for obtaining the radiograms and evaluating the control signals thereof in order to provide a vehicle driver with information regarding the condition of different tires; and
a multiplexer circuit communicating with said single receiver and actuating said switch according to a time-controlled multiplex method,whereinsaid multiplexer circuittransfers a number of switches into the ON state before a radiogram has been received;
continuously transfers one switch after the other into the OFF state after the arrival of a radiogram and during the evaluation of its synchronizing signal until the receiving antenna comprising the strongest RF signal has been determined; and
then transfers a number of switches into the ON state during the subsequent reception of the control signal of this same radiogram in order to provide a multi-path reception of this control signal by the receiving antennas at the single receiver.
1 Assignment
0 Petitions
Accused Products
Abstract
A tire pressure monitoring device for a vehicle having several wheels comprises a central receiving and evaluation device at the vehicle. Each a receiving antenna (A, B, C, . . . N) is arranged stationarily at the vehicle structure adjacent to at least each active wheel and thus attributed to said specific wheel. All said receiving antennas (A, B, C, . . . N) being connected via each a distinctive connecting line (a, b, c, . . . n) with a single receiver means. Said receiver means comprises a multiplexer-circuit connecting per time interval only one single selected receiving antenna or several selected receiving antennas with said receiving means. Further, said receiver means sensing a field strength of each specific radiogram and thus selecting said specific receiving antenna comprising the highest field strength of a received radiogram during said specific time interval. Thus, central evaluation means may attribute a specific radiogram to said specific wheel being arranged adjacent to said receiving antenna comprising the highest field strength of a received radiogram during said specific time interval.
75 Citations
40 Claims
-
1. A tire pressure monitoring device for a vehicle having several wheels, wherein each wheel is provided with a pneumatic tire, comprising:
-
a signal generating device at each wheel sensing the air pressure within the pneumatic tire and providing corresponding electric pressure signals; a receiving antenna per wheel arranged stationarily at the vehicle structure adjacent to the wheel, and being connected via a distinctive connecting line with a single receiver; a switch being inserted into each connecting line; a transmitter at each wheel generating a radiogram comprising at least a synchronizing signal and control signals corresponding at least to the electric pressure signals for telemetric transmission of said radiogram to said receiving antennas; said single receiver; sensing a field strength of the synchronizing signal of each specific radiogram, selecting said specific receiving antenna having the highest field strength of a received radiogram during a specific time interval, and attributing the specific radiogram to said specific wheel being arranged adjacent to said receiving antenna comprising the highest field strength of the received radiogram during said specific time interval; a central evaluation means coupled with said single receiver for obtaining the radiograms and evaluating the control signals thereof in order to provide a vehicle driver with information regarding the condition of different tires; and a multiplexer circuit communicating with said single receiver and actuating said switch according to a time-controlled multiplex method, wherein said multiplexer circuit transfers a number of switches into the ON state before a radiogram has been received; continuously transfers one switch after the other into the OFF state after the arrival of a radiogram and during the evaluation of its synchronizing signal until the receiving antenna comprising the strongest RF signal has been determined; and then transfers a number of switches into the ON state during the subsequent reception of the control signal of this same radiogram in order to provide a multi-path reception of this control signal by the receiving antennas at the single receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 39)
-
-
10. A tire pressure monitoring device for a vehicle having several wheels wherein each wheel is provided with a pneumatic tire, comprising:
-
a signal generating device at each wheel sensing the air pressure within the pneumatic tire and providing corresponding electric pressure signals; a receiving antenna per wheel arranged stationarily at the vehicle structure adjacent to the wheel, and each being connected via a distinctive connecting line with a single receiver; a switch being inserted into each connecting line; a transmitter at each wheel generating a radiogram comprising at least a synchronizing signal and control signals corresponding at least to the electric pressure signals for telemetric transmission of said radiogram to said receiving antennas; said single receiver; sensing a field strength of the synchronizing signal of each radiogram, selecting a specific receiving antenna comprising the highest field strength of a received radiogram during a specific time interval, and attributing a specific radiogram to said wheel being arranged adjacent to said specific receiving antenna comprising the highest field strength of the received radiogram during said specific time interval; a central evaluation means coupled with said single receiver for obtaining the radiograms and evaluating the control signals thereof in order to provide a vehicle driver with information regarding the condition of the tires; and a multiplexer circuit integrated within said single receiver and actuating said switch according to a time-controlled multiplex method, wherein said multiplexer circuit transfers one after the other only one single switch into the ON state during the reception of a synchronizing signal of the radiogram until the receiving antenna comprising the strongest RF signal has been determined; and transfers several switch means into the ON state during reception of the control signal of this radiogram in order to provide a multi-path reception of the control signal by the receiving antennas, at the single receiver. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 40)
-
-
20. A multi-path receiver for use with a tire pressure monitoring device comprising:
-
a number of receiving antennas for receiving telemetrically transmitted radiograms comprising at least a synchronizing signal and at least control signals related to the tire pressure wherein each receiving antennas is arranged stationarily at the vehicle structure adjacent to at least each active wheel; all said receiving antennas being connected via a distinctive connecting line with a single receiver; a switch being inserted into each connecting line; a multiplexer circuit integrated within said single receiver and actuating said switch according to a time-controlled multiplex method, wherein said multiplexer circuit transfers a number of switches into the ON state before the radiogram has been received; continuously transfers one switch after the other into the OFF state after the arrival of the radiogram and during the evaluation of its synchronizing signal until the receiving antennas comprising the strongest RF signal has been determined; and transfers a number of switches into the ON state during the subsequent reception of the control signal of this radiogram in order to provide a multi-path reception of the control signal by the receiving antennas at a single receiver. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A multi-path receiver for use with a tire pressure monitoring device comprising:
-
a number of receiving antennas for receiving telemetrically transmitted radiograms comprising at least a synchronizing signal and at least control signals related to the tire pressure wherein each receiving antenna is arranged stationarily at the vehicle structure adjacent an active wheel and thus attributed to said specific wheel; all said receiving antennas being connected via each a distinctive connecting line with a single receiver; a switch being inserted into each connecting line; a multiplexer circuit integrated within said single receiver and actuating said switch according to a time-controlled multiplex method, wherein the multiplexer circuit transfers one after the other only one single switch into the ON state during reception of a synchronizing signal of the radiogram until the receiving antenna comprising the strongest RF signal has been determined; and then transfers a number of switches into the ON state during the subsequent reception of the control signal of this same radiogram in order to provide a multi-path reception of this control signal by the receiving antennas at the single receiver. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
-
Specification