Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1990-07-12
1991-07-09
Woodiel, Donald O.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
340448, B60C 2304
Patent
active
050294687
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the monitoring of the wheels of a vehicle, particularly the tires. In particular, it relates to the elements installed on the vehicle, i.e., in the stationary space or more precisely in the space not moving in rotation.
It relates to those monitoring systems comprising modules installed on each wheel to be monitored, connections between wheel and stationary space, for example, by antennas coupled inductively and, on the vehicle, elements assuring the overall operating of the system to provide a signal usable by the driver or by any alarm system, centralized or not.
Patent application No. W087/00127 proposes a coding making it possible to transmit the value of the pressure and the temperature of a tire from the wheel carrying said tire to the vehicle (stationary space). The coding described lends itself to the production of a transmission by inductive coupling. Patent application No. W087/00129 describes a way of accumulating and using the electric energy transmitted by an alternating current transmitted by inductive coupling. A device thus designed operates according to the following cycle: excitation of the module installed on the wheel by transmittal, from the vehicle, of an excitation, in which said wheel module will draw the energy necessary to its operating, then monitoring, on the vehicle, of the signal received in response to the excitation. This received signal comprises, by coding, the values of the parameters measured on the wheel. According to the design proposed by publication No. W087/00129, said signal is produced by the wheel module as soon as the excitation stops.
This invention has as its object to propose elements for excitation and monitoring of wheel modules which make it possible to reach as high a scanning speed as possible.
Another object of the invention is to propose a device as insensitive to the electromagnetic environment and radio frequency as possible, and which does not cause noise able to interfere with the electric equipment on board the vehicle.
Another object of the invention is to propose a device able to monitor the wheel module as quickly as possible after the end of the excitation.
To produce an excitation device whose performance data remain constant whatever the supply voltage of the battery of the vehicle may be is also another object of the invention.
The excitation and monitoring device according to the invention, usable for monitoring of the wheels of a vehicle, said device comprising for each wheel a module able to accumulate electric energy thanks to the transmission of a current by inductive coupling from the vehicle to said wheel, able to code the values of the parameters observed on a wheel, and able to transmit, by inductive coupling, the signal thus coded, an antenna attached coaxially to the wheel being connected to said module, said device being provided to be connected to one inspection antenna per wheel, said inspection antenna being attached to a part of the vehicle not moving in rotation so that the inductive coupling with the wheel antenna is approximately constant, is characterized in that it comprises
per wheel, a unit assuring the production of the exciting current and the shaping of the signal received in response to the excitation,
means of controlling the cycle of "excitation of wheel modules and monitoring of the latter" assuring the successive monitoring of each wheel and, simultaneously with said monitoring of a wheel, the excitation of at least one other wheel module which will be monitored in the following phase of the cycle,
means assuring the processing of the received signal to extract from it said values.
The following figures illustrate the invention and make it possible to understand it well:
FIG. 1 is a general diagram of a device according to the invention.
FIG. 2 shows in more detail a unit included in a device according to the invention.
FIG. 3 is a timing diagram of a current determined in said unit.
FIGS. 4a, 4b, 4c show the control of the excitation.
In Fig. 1, an inspection antenna 1, intended to b
REFERENCES:
patent: 4467641 (1984-08-01), Abraham
patent: 4567459, Folger et al.
patent: 4703650 (1987-11-01), Dosjoub et al.
patent: 4737761 (1988-04-01), Dosjoub et al.
patent: 4749993 (1988-01-01), Szabo et al.
Compagnie Generale des Etablissements Michelin - Michelin & Cie
Woodiel Donald O.
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