Device for monitoring at least one parameter for a plurality of vehicle wheels
First Claim
1. A device for monitoring vehicle wheels, comprising:
- detector units disposed at the wheels, each detector unit having;
a sensor for registering at least one parameter of a wheel; and
a transmitter unit transmitting information regarding the at least one parameter, each of said detector units transmitting, with said transmitter unit, the information in a modulated signal over a wireless transmission path;
a central evaluation and control unit having a receiver unit receiving the information from said transmitter unit and demodulating the signal, said control unit evaluating the information from said detector units, and generating signals dependent thereon;
said control unit having a normal operating mode and an assignment mode and;
in said normal operating mode;
each detector unit transmitting, as the information, an information item relating to the registered parameter and a wheel identifier uniquely defined for each of the wheels; and
said control unit;
evaluating the wheel identifier and the information relating to the registered parameter-from the signal demodulated by said receiver unit; and
assigning a wheel position to each information item relating to the registered parameter from the identifier and from a stored assignment information item;
in said assignment mode;
each said transmitter unit transmitting, as the information, at least the wheel identifier;
said receiver unit generating a signature signal representing a measure for an average signal power of the received modulated signal;
a duration of the signal transmitted by said transmitter unit of said detector units being shorter in comparison with a time required for a complete revolution of a wheel at a maximum speed of the wheel;
said control unit registering said signature signal derived from each received signal and assigning an angle information item to the respective value of said signature signal;
said control unit acquiring the angle information item from one of;
a time interval between one of;
said signature signals; and
said signature signals and a fixed time; and
the group consisting of;
a velocity of the vehicle;
a parameter proportional to the velocity of the vehicle; and
an angle information item relating to an angular position of the respective wheel fed to said control unit; and
said control unit assigning to said wheel position said wheel identifier transmitted by each of said detector units by comparing one of registered values and an information item determined therefrom with a stored signature information characteristic of each said wheel position, and storing the angle information item as an assignment information item.
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Accused Products
Abstract
A device for monitoring at least one parameter for vehicle wheels includes, on each wheel, a detector unit having a transmitter unit that respectively transmits a phase-modulated or frequency-modulated signal to a central evaluation and control unit. Each detector unit transmits, at specific time intervals, a brief signal that contains a uniquely defined identifier. After a wheel is changed, a renewed assignment of the detector unit to the respective wheel positions can be carried out in an assignment mode of the detector unit and of the control unit, by registering a profile of the mean reception power for each detector unit as a function of the angular position of the respective wheel and comparing such signature profile with stored signature information. The comparison can be carried out by cross-correlating the two respectively decisive curves, or by comparing individual values or specific characteristic variables of the profiles.
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Citations
14 Claims
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1. A device for monitoring vehicle wheels, comprising:
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detector units disposed at the wheels, each detector unit having;
a sensor for registering at least one parameter of a wheel; and
a transmitter unit transmitting information regarding the at least one parameter, each of said detector units transmitting, with said transmitter unit, the information in a modulated signal over a wireless transmission path;
a central evaluation and control unit having a receiver unit receiving the information from said transmitter unit and demodulating the signal, said control unit evaluating the information from said detector units, and generating signals dependent thereon;
said control unit having a normal operating mode and an assignment mode and;
in said normal operating mode;
each detector unit transmitting, as the information, an information item relating to the registered parameter and a wheel identifier uniquely defined for each of the wheels; and
said control unit;
evaluating the wheel identifier and the information relating to the registered parameter-from the signal demodulated by said receiver unit; and
assigning a wheel position to each information item relating to the registered parameter from the identifier and from a stored assignment information item;
in said assignment mode;
each said transmitter unit transmitting, as the information, at least the wheel identifier;
said receiver unit generating a signature signal representing a measure for an average signal power of the received modulated signal;
a duration of the signal transmitted by said transmitter unit of said detector units being shorter in comparison with a time required for a complete revolution of a wheel at a maximum speed of the wheel;
said control unit registering said signature signal derived from each received signal and assigning an angle information item to the respective value of said signature signal;
said control unit acquiring the angle information item from one of;
a time interval between one of;
said signature signals; and
said signature signals and a fixed time; and
the group consisting of;
a velocity of the vehicle;
a parameter proportional to the velocity of the vehicle; and
an angle information item relating to an angular position of the respective wheel fed to said control unit; and
said control unit assigning to said wheel position said wheel identifier transmitted by each of said detector units by comparing one of registered values and an information item determined therefrom with a stored signature information characteristic of each said wheel position, and storing the angle information item as an assignment information item. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification