Coding of the value of several quantities measured in a tire
First Claim
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1. Device for coding the value of n quantities measured on a tire, making possible the transmission of said values to the frame carrying said tire, comprising:
- means to mark a start of a measuring cycle by providing an output;
a generator delivering a reference signal in ramp form, said signal in ramp form being initiated by said output of said means to mark;
n means each sensitive to one of said quantities, each constantly delivering an output signal as a function of the value of said quantity to which it is sensitive;
an element delivering a reference value selected in advance to correspond to the end of the measuring cycle;
n+1 coincidence detectors receiving, at one of their two inputs, said signal in ramp form, and delivering a high signal when the signals at their two inputs are identical, and a low signal at any other time;
said other input receiving;
for first coincidence detector, the output signal of one of the means sensitive to said quantities,for last coincidence detector, said reference value,for remaining n-1 coincidence detectors, an output value of a summation device providing the sum of the value of said other input of the preceding coincidence detector and the output signal of one of n means sensitive to said quantities.
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Abstract
Coding of the value of any number of quantities measured in a tire, for example its pressure and its temperature, is carried out using a ratio of time intervals TP/Tr, Tt/Tr. This frees the device from the effect of the time shift of the modulation system, the time shift affecting simultaneously the numerator and the denominator of said ratio.
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4 Claims
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1. Device for coding the value of n quantities measured on a tire, making possible the transmission of said values to the frame carrying said tire, comprising:
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means to mark a start of a measuring cycle by providing an output; a generator delivering a reference signal in ramp form, said signal in ramp form being initiated by said output of said means to mark; n means each sensitive to one of said quantities, each constantly delivering an output signal as a function of the value of said quantity to which it is sensitive; an element delivering a reference value selected in advance to correspond to the end of the measuring cycle; n+1 coincidence detectors receiving, at one of their two inputs, said signal in ramp form, and delivering a high signal when the signals at their two inputs are identical, and a low signal at any other time; said other input receiving; for first coincidence detector, the output signal of one of the means sensitive to said quantities, for last coincidence detector, said reference value, for remaining n-1 coincidence detectors, an output value of a summation device providing the sum of the value of said other input of the preceding coincidence detector and the output signal of one of n means sensitive to said quantities. - View Dependent Claims (2, 3, 4)
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Specification