Patent US4609905A successfully refreshed from Google Patents.
US4609905A
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Tire condition monitoring system
Assignee: Eaton Corp
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Filing: 1984-05-11
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Granted: 1986-09-02
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Expires: 2004-05-11
Abstract
Abstract Tire pressure monitors (10) are incorporated in vehicles (12) having pneumatic tires (15) to continuously or periodically measure air pressure within each tire and to alert the driver should the pressure in any of the tires fall below a predetermined value. A passive transponder (22) is affixed within the drop center (41) of each wheel (17) and includes a pressure sensing switch (36). An RF transmitter (46) centrally located within the vehicle body interrogates each transponder, either serially or simultaneously. Each transponder, in turn, reflects a predetermined harmonic of the RF signal back to a receiver (48) as a function of the state (open or closed) of its associated pressure switch. The receiver then outputs a signal to a processor/display unit (50) to activate an alarm or indicating device (58).
Inventors
- 👤 Anthony P. Uzzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:10
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/0433; B60C23/0435; B60C23/0444; B60C23/0491; B60C23/0498; B60C23/04985; G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/077; G06K19/07749; G06K19/07758; G06K19/07764
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
121 words
A tire condition monitoring system comprising: transmitter means operative to generate an RF signal having a characteristic frequency f; a wheel-mounted passive transponder including, (i) first antenna means for receiving said RF signal, (ii) a nonlinear element in circuit with said first antenna means to effect a distortion of said RF signal characterized by a harmonic signal of a frequency nf, where n is a real number other than 1, (iii) second antenna means in circuit with said nonlinear element to radiate said harmonic signal, and (iv) sensor means operative to disable generation of said harmonic signal in response to variation in a monitored tire condition; and receiver means for providing a sensible condition signal in response to said harmonic signal.
Claim 2
Dependent Claim
121 words
A tire condition monitoring system comprising: transmitter means operative to generate an RF signal having a characteristic frequency f; a wheel-mounted passive transponder including, (i) first antenna means for receiving said RF signal, (ii) a nonlinear element in circuit with said first antenna means to effect a distortion of said RF signal characterized by a harmonic signal of a frequency nf, where n is a real number other than 1, (iii) second antenna means in circuit with said nonlinear element to radiate said harmonic signal, and (iv) sensor means operative to disable generation of said harmonic signal in response to variation in a monitored tire condition; and receiver means for providing a sensible condition signal in response to said harmonic signal.
Claim 3
Dependent Claim
13 words
The tire condition monitoring system of claim 1 wherein n is an integer.
Claim 4
Dependent Claim
14 words
The tire conditioning monitoring system of claim 1 wherein n is equal to 3.
Claim 5
Dependent Claim
35 words
The tire condition monitoring system of claim 1 wherein said first and second antenna means are distributed about the outer periphery of the wheel associated therewith to effect system operation independent of wheel rotational orientation.
Claim 6
Dependent Claim
40 words
The tire condition monitoring system of claim 1 wherein said sensor means comprises a tire fluid pressure sensor operative to disable generation of said harmonic signal when sensed fluid pressure in an associated wheel-tire assembly falls below a predetermined level.
Claim 7
Dependent Claim
25 words
The tire condition monitoring system of claim 1 wherein said transmitter means and receiver means comprise vehicle body antenna, means disposed adjacent an associated wheel.
Claim 8
Dependent Claim
59 words
The tire condition monitoring system of claim 6 wherein said vehicle body antenna means comprises a transmitting antenna associated with said transmitter means and a receiving antenna associated with said receiver means, said transmitting antenna being closely electrically coupled with said transponder first antenna means and said receiving antenna being closely electrically coupled with said transponder second antenna means.
Claim 9
Dependent Claim
15 words
The tire condition monitoring system of claim 1 wherein said nonlinear element comprises a diode.
Claim 10
Dependent Claim
127 words
A wheel-mounted passive transponder for use in a tire condition monitoring system of the type including a transmitter for generating an RF signal having a characteristic frequency f and a receiver for providing a sensible condition signal in response to variation in a monitored tire condition, said transponder comprising: first antenna means for receiving said RF signal; a nonlinear element in circuit with said first antenna means to effect a distortion of said RF signal characterized by a harmonic signal of a frequency nf, where n is a real number other than 1; second antenna means in circuit with said nonlinear element to radiate said harmonic signal; and sensor means operative to disable generation of said harmonic signal in response to variation in a monitored tire condition.
Claim 11
Dependent Claim
127 words
A wheel-mounted passive transponder for use in a tire condition monitoring system of the type including a transmitter for generating an RF signal having a characteristic frequency f and a receiver for providing a sensible condition signal in response to variation in a monitored tire condition, said transponder comprising: first antenna means for receiving said RF signal; a nonlinear element in circuit with said first antenna means to effect a distortion of said RF signal characterized by a harmonic signal of a frequency nf, where n is a real number other than 1; second antenna means in circuit with said nonlinear element to radiate said harmonic signal; and sensor means operative to disable generation of said harmonic signal in response to variation in a monitored tire condition.
Claim 12
Dependent Claim
149 words
A tire pressure monitoring system for use with a vehicle having at least one pneumatic tire and associated mating wheel, said system comprising: transmitter means operative to generate an RF signal having a characteristic frequency f; a passive transponder mounted on said wheel and including, (i) a first antenna for receiving said RF signal, (ii) a nonlinear element in circuit with said first antenna to effect a distortion of said RF signal characterized by a harmonic signal of a frequency nf, where n is a real number other than 1, (iii) a second antenna in circuit with said nonlinear element to radiate said harmonic signal, and (iv) a tire pressure sensor operative to disable generation of said harmonic signal in response to variation in tire pressure from a predetermined set point; and receiver means for providing a sensible abnormal tire pressure condition signal in response to said harmonic signal.
Claim 13
Dependent Claim
149 words
A tire pressure monitoring system for use with a vehicle having at least one pneumatic tire and associated mating wheel, said system comprising: transmitter means operative to generate an RF signal having a characteristic frequency f; a passive transponder mounted on said wheel and including, (i) a first antenna for receiving said RF signal, (ii) a nonlinear element in circuit with said first antenna to effect a distortion of said RF signal characterized by a harmonic signal of a frequency nf, where n is a real number other than 1, (iii) a second antenna in circuit with said nonlinear element to radiate said harmonic signal, and (iv) a tire pressure sensor operative to disable generation of said harmonic signal in response to variation in tire pressure from a predetermined set point; and receiver means for providing a sensible abnormal tire pressure condition signal in response to said harmonic signal.
Claim 14
Dependent Claim
44 words
The tire condition monitoring system of claim 10 wherein said transmitter means comprises a transmitter and an RF signal transmitting antenna, said transmitting antenna disposed on a relatively stationary portion of said vehicle adjacent said tire and closely electrically coupled with said first antenna.
Claim 15
Dependent Claim
44 words
The tire condition monitoring system of claim 10 wherein said receiver means comprises a receiver and a harmonic signal receiving antenna, said receiving antenna disposed on a relatively stationary portion of said vehicle adjacent said tire and closely electrically coupled with said second antenna.
Claim 16
Dependent Claim
30 words
The tire condition monitoring system of claim 10 wherein said first and second antennas are carried by an elongated flexible insulative substrate disposed within the drop center of said wheel.
Claim 17
Dependent Claim
15 words
The tire condition monitor system of claim 13 wherein said nonlinear element comprises a diode.
Claim 18
Dependent Claim
18 words
The tire condition monitoring system of claim 14 wherein said diode and sensor are carried by said substrate.
Claim 19
Dependent Claim
36 words
The tire condition monitoring system of claim 10 wherein said first and second antennas are distributed about the outer periphery of said wheel within said pneumatic tire to effect system operation independent of wheel rotation orientation.
Claim 20
Dependent Claim
19 words
The tire condition monitoring system of claim 10 wherein said pressure sensor is electrically parallel with said nonlinear element.
Claim 21
Dependent Claim
20 words
The tire condition monitoring system of claim 10 wherein said pressure sensor is electrically in series with said nonlinear element.
References Cited (Backward Citations)
US2274557A
Cited
US2894246A
Cited
US3155938A
Cited
US3092806A
Cited
US3662335A
Cited
US3663387A
Cited
US3723966A
Cited
US3694803A
Cited
US3806905A
Cited
US3786413A
Cited
US3881170A
Cited
US3831161A
Cited
US3858174A
Cited
US3780373A
Cited
US4131878A
Cited
US3898615A
Cited
US3974477A
Cited
US4074227A
Cited
US4130817A
Cited
US4017826A
Cited
US4082960A
Cited
US4064482A
Cited
US4052696A
Cited
US4308520A
Cited
US4180795A
Cited
US4072927A
Cited
US4110732A
Cited
US4242671A
Cited
US4267546A
Cited
US4237445A
Cited
US4507956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |