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US4703650A
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Circuit for the coding of the value of two variables measured in a tire, and device for monitoring tires employing such a circuit
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1986-06-24
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Granted: 1987-11-03
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Expires: 2006-06-24
Abstract
Abstract A coding circuit comprises an astable multivibrator which transforms the measurement of the variables in question, for instance pressure and temperature, into a time measurement. The astable multivibrator delivers a pulse signal whose pulse width is a function of the temperature and the cyclic ratio of which is a function of the pressure.
Inventors
- 👤 Andre Dosjoub
- 👤 David Myatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:30
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/0427
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
140 words
A circuit for coding the value of two variables measured in a tire, which permits the transmission of the values to the chassis bearing the tire without galvanic contact, characterized by the fact that the circuit comprises: (a) a first unit the transfer function of which is a function of the first of the variables measured; (b) means for alternately connecting to the input of the first unit either a reference voltage or a voltage which is a function of the second of the variables measured to provide an output signal representing either said first variable or said second variable, respectively; and (c) a second unit controlled by the output signal of the first unit and delivering a pulse signal having parameters representing the values of the measured variables, said connecting means being actuated in response to said pulse signal.
Claim 2
Dependent Claim
140 words
A circuit for coding the value of two variables measured in a tire, which permits the transmission of the values to the chassis bearing the tire without galvanic contact, characterized by the fact that the circuit comprises: (a) a first unit the transfer function of which is a function of the first of the variables measured; (b) means for alternately connecting to the input of the first unit either a reference voltage or a voltage which is a function of the second of the variables measured to provide an output signal representing either said first variable or said second variable, respectively; and (c) a second unit controlled by the output signal of the first unit and delivering a pulse signal having parameters representing the values of the measured variables, said connecting means being actuated in response to said pulse signal.
Claim 3
Dependent Claim
38 words
A circuit according to claim 1, characterized by the fact that the first unit comprises essentially an integrator and by the fact that the time constant of the first unit is a function of the first measured variable.
Claim 4
Dependent Claim
33 words
A circuit according to claim 1 or 2, characterized by the fact that the second unit comprises essentially means permitting the referencing of two thresholds for the output signal of the first unit.
Claim 5
Dependent Claim
22 words
A circuit according to claim 3, characterized by the fact that the means permitting the referencing comprise two comparators and a flipflop.
Claim 6
Dependent Claim
25 words
A circuit according to claim 3, characterized by the fact that the means permitting the referencing comprise a single comparator provided with a feedback loop.
Claim 7
Dependent Claim
51 words
A circuit according to claim 1 or 2, characterized by the fact that the voltage which is a function of the second of the variables measured is applied to the input of the first unit via an operational amplifier receiving a voltage delivered by a detector responsive to the second variable.
Claim 8
Dependent Claim
32 words
A circuit according to claim 6, characterized by the fact that said second variable is the pressure prevailing in the tire and by the fact that the detector is a piezoresistive gauge.
Claim 9
Dependent Claim
53 words
A circuit according to claim 1 or 2, characterized by the fact that the connecting means are formed of a transistor mounted as a common emitter the base of which is controlled by the output of the second unit and the collector of which is joined to the input of the first unit.
Claim 10
Dependent Claim
26 words
A circuit according to claim 1 or 2, characterized by the fact that it is essentially in the form of a hybrid circuit or integrated circuit.
Claim 11
Dependent Claim
71 words
A circuit according to claim 2, characterized by the fact that the integrator is formed of a connection which comprises at least one operational amplifier, a resistor being connected to the inverting input and a condenser being inserted in the feedback circuit, a voltage being applied to the non-inverting input of the operational amplifier by a resistance divider bridge permitting calibration of the the circuit relative to the second measured variable.
Claim 12
Dependent Claim
61 words
A circuit according to claim 10, characterized by the fact that the first variable is the temperature prevailing in the tire and by the fact that a temperature detector is used in the form of a silicon resistor mounted in the feedback loop of an additional operational amplifier, the output of which acts on said one operational amplifier in the integrator.
Claim 13
Dependent Claim
50 words
A circuit according to claim 10, characterized by the fact that the first variable is the temperature prevailing in the tire and by the fact that a temperature detector is used in the form of a silicon resistor mounted at the output of said one operational amplifier in the integrator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |