Patent US5539388A successfully refreshed from Google Patents.
US5539388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telemetry and control system
Assignee: National Digital Electronics Inc
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Filing: 1995-06-07
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Granted: 1996-07-23
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Expires: 2015-06-07
Abstract
Abstract A telemetry and control system is disclosed for use in direct current power wiring applications, such as those used in automobiles or other vehicles. The system includes a master transmitter which encodes data as a train of current pulses which modulate the d.c. supply voltage. A slave receiver at another location, connected to the same power source through pre-existing wiring, amplifies the supply voltage modulation, recovers the data waveform, and decodes it, to effect an action or display a measurement or status indication. A second transmitter combined with the slave receiver may transmit data similarly for reception by a second receiver combined with the master transmitter, to enable two-way communication therebetween. Applications of the system include an emergency battery booster, an anti-theft battery disconnection device, a distress alert system, activation and reception of data from outboard devices, and remote measurement of fluid levels, temperatures and pressures.
Inventors
- 👤 O. S. Modgil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:03
CPC Classifications
B; B60; B60R; B60R16/00; B60R16/02; B60R16/03; B60R16/0315; H; H04; H04B; H04B3/00; H04B3/54; H04B3/548; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/5416; H04B2203/5429; H04B2203/5441; H04B2203/5445; H04B2203/5458; H04B2203/5462; H04B2203/547; H04B2203/5495
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
166 words
An apparatus for transmitting and receiving telemetry and control signals via an existing direct current power circuit, comprising: a transmitter circuit connected to said power circuit at a first location for generating a pulsed signal coded according to a desired telemetry or control function and for imposing said pulsed signal on said power circuit, said pulsed signal being similar to a noise induced by existing electrical activity caused by other devices connected to said power circuit, but having a more regular and controlled periodicity, whereby said pulsed signal is prevented from interfering with other devices connected to said power circuit by existing precautions in said other devices directed to said noise, but is discernable from said noise based on said more regular and controlled periodicity; and a receiver circuit at a second location connected to said power circuit for determining the presence of said pulsed signal in said power circuit and for regenerating and decoding said pulsed signal to perform said desired telemetry or control function.
Claim 2
Independent Claim
166 words
An apparatus for transmitting and receiving telemetry and control signals via an existing direct current power circuit, comprising: a transmitter circuit connected to said power circuit at a first location for generating a pulsed signal coded according to a desired telemetry or control function and for imposing said pulsed signal on said power circuit, said pulsed signal being similar to a noise induced by existing electrical activity caused by other devices connected to said power circuit, but having a more regular and controlled periodicity, whereby said pulsed signal is prevented from interfering with other devices connected to said power circuit by existing precautions in said other devices directed to said noise, but is discernable from said noise based on said more regular and controlled periodicity; and a receiver circuit at a second location connected to said power circuit for determining the presence of said pulsed signal in said power circuit and for regenerating and decoding said pulsed signal to perform said desired telemetry or control function.
Claim 3
Dependent Claim
85 words
The apparatus of claim 1 further comprising: a second transmitter circuit connected to said power circuit at said second location for transmitting a second pulsed signal coded according to a second desired telemetry or control function on said power circuit; and a second receiver circuit connected to said power circuit at said first location for determining the presence of said second pulsed signal in said power circuit and for regenerating and decoding said second pulsed signal to perform said second desired telemetry or control function.
Claim 4
Dependent Claim
29 words
The apparatus of claim 1, said transmitter generating said pulsed signal as a train of pulses modulated according to a predetermined code representing said desired telemetry or control function.
Claim 5
Dependent Claim
56 words
The apparatus of claim 1, said transmitter circuit comprising: an electrical transducer for converting a desired measured quantity or user input into an electrical signal; a signal encoding circuit for converting said electrical signal into said pulsed signal; and a circuit for creating a signal in said power circuit as a function of said pulsed signal.
Claim 6
Dependent Claim
17 words
The apparatus of claim 4, said signal encoding circuit comprising a crystal-controlled oscillator and a frequency divider.
Claim 7
Dependent Claim
91 words
The apparatus of claim 5, said circuit for creating said signal comprising: an electronic switch having a switched current path controlled by said pulsed signal applied to a control terminal of said electronic switch; and impedance means connected in series with the switched current path of said electronic switch; said impedance means and said switch current path being connected between a power supply conductor and ground of said power circuit so as to cause said pulsed signal to be created in said power circuit whenever said switched current path is conductive.
Claim 8
Dependent Claim
12 words
The apparatus of claim 6, said electronic switch comprising a bipolar transistor.
Claim 9
Dependent Claim
12 words
The apparatus of claim 6, said electronic switch comprising a field-effect transistor.
Claim 10
Dependent Claim
16 words
The apparatus of claim 6, said impedance means comprising a resistor and an inductor in series.
Claim 11
Dependent Claim
28 words
The apparatus of claim 6, wherein said impedance means comprising a resistor in series with an inductor, and a capacitor in parallel with said resistor and said inductor.
Claim 12
Dependent Claim
32 words
The apparatus of claim 4, wherein said transmitter generate said pulsed signal as a train of pulses modulated according to a predetermined code indicative of said desired measured quantity or user input.
Claim 13
Dependent Claim
21 words
The apparatus of claim 4, wherein said transmitter generate said pulsed signal as a train of pulses at a predetermined frequency.
Claim 14
Dependent Claim
15 words
The apparatus of claim 4, said electrical transducer comprising a switch operable by a user.
Claim 15
Dependent Claim
72 words
The apparatus of claim 4, said electrical transducer comprising a circuit for generating a unique identification code, said receiver circuit being responsive to said unique identification code to identify and compare said identification code with a predetermined code stored in said receiver circuit, said receiver circuit providing said desired telemetry or control function only when said identification code generated by said transmitter circuit matches said predetermined code stored in said receiver circuit.
Claim 16
Dependent Claim
20 words
The apparatus of claim 4, said electrical transducer being sensitive to one or more of fluid level, pressure, or temperature.
Claim 17
Dependent Claim
14 words
The apparatus of claim 4, said electrical transducer being sensitive to engine oil pressure.
Claim 18
Dependent Claim
16 words
The apparatus of claim 4, said electrical transducer being sensitive to engine oil level and temperature.
Claim 19
Dependent Claim
16 words
The apparatus of claim 4, said electrical transducer being sensitive to transmission fluid level and temperature.
Claim 20
Dependent Claim
14 words
The apparatus of claim 4, said electrical transducer being sensitive to battery acid level.
Claim 21
Dependent Claim
12 words
The apparatus of claim 4, said electrical transducer being a radar detector.
Claim 22
Dependent Claim
20 words
The apparatus of claim 4, said electrical transducer being sensitive to a distance of an object from said electrical transducer.
Claim 23
Dependent Claim
79 words
The apparatus of claim 1, said receiver circuit comprising: amplifier circuitry for monitoring and amplifying voltage fluctuations on said power circuit due to said pulsed signal; pulse recovery circuitry for determining, from said voltage fluctuations, transition times of said pulsed signal, and for reconstituting therefrom a coded signal indicative of said desired telemetry or control function; and decoder circuitry for determining from said pulsed signal a measured quantity or user input represented thereby and for outputting a decoded signal.
Claim 24
Dependent Claim
34 words
The apparatus of claim 22, further comprising display and actuator means for displaying said measured quantity or user input and for performing a desired function as determined by said measured quantity or user input.
Claim 25
Dependent Claim
20 words
The apparatus of claim 22, said amplifier circuitry comprising an operational amplifier coupled to said power circuit through a capacitor.
Claim 26
Dependent Claim
39 words
The apparatus of claim 22, said pulse recovery circuitry comprising circuitry for detecting voltage spikes occurring at transition times of said pulsed signal and for generating a rectangular pulse of predetermined length each time said voltage spike is detected.
Claim 27
Dependent Claim
168 words
The apparatus of claim 22, said pulse recovery circuitry comprising: an input and an output terminal; a capacitor, having an ungrounded terminal and a grounded terminal; a diode having a cathode connected to the input terminal and an anode connected to the ungrounded terminal of said capacitor; a resistor having a first end connected to a power source and a second end connected to the junction of said diode and said capacitor; and an amplifier having an amplifier input connected to the junction of said diode and said capacitor, and an amplifier output connected to the output terminal; said pulse recovery circuitry being operative to discharge said capacitor whenever a voltage spike of sufficient size and appropriate polarity is presented to the input terminal, causing the amplifier output to change state for a period of time until said capacitor is substantially recharged by said resistor, thereby generating a train of rectangular pulses of predetermined length at the repetition frequency of the voltage spikes presented at the input terminal.
Claim 28
Dependent Claim
56 words
The apparatus of claim 22, said decoder circuitry comprising a comparator, operative to compare a received pulse repetition frequency of a train of rectangular pulses generated by said pulse recovery circuitry with a signal of predetermined frequency, and for providing an output signal whenever the received pulse repetition frequency substantially equals the signal of predetermined frequency.
Claim 29
Dependent Claim
36 words
The apparatus of claim 27, further comprising a crystal controlled oscillator and a frequency divider together generating said signal of predetermined frequency, said predetermined frequency being substantially equal to a frequency generated in the transmitter circuit.
Claim 30
Dependent Claim
46 words
The apparatus of claim 28, said crystal controlled oscillator comprising means for locking the signal of predetermined frequency into synchronization with said train of rectangular pulses generated by said pulse recovery circuitry, whenever the frequency of the train of rectangular pulses approximately equals the predetermined frequency.
Claim 31
Dependent Claim
30 words
The apparatus of claim 22, further comprising means for monitoring a voltage of a battery and for displaying an indication when the voltage of the battery exceeds a predetermined voltage.
Claim 32
Dependent Claim
30 words
The apparatus of claim 22, said transmitter generating said pulsed signal as a train of pulses modulated according to a predetermined code to represent the desired telemetry or control function.
Claim 33
Dependent Claim
57 words
The apparatus of claim 22, said decoder circuitry determining from said pulsed signal a unique identification code and comparing said unique identification code with a predetermined code stored in said receiver circuit, and providing a signal for operating a display and actuator means whenever said unique identification code matches said predetermined code stored in said receiver circuit.
Claim 34
Dependent Claim
74 words
The apparatus of claim 23, said display and actuator means comprising: means for connecting to the terminals of a main battery, said main battery providing direct current power to said power circuit; and a spare battery for recharging said main battery, when said transmitter circuit provides pulses at a frequency substantially equal to the frequency of the internally generated signal and when said main battery voltage has a voltage lower than a predetermined voltage.
Claim 35
Dependent Claim
66 words
The apparatus of claim 23, said display and actuator means comprising: current determining means for determining whether a large current is flowing, indicative of engine start; and means for disconnecting from said power circuit said main battery providing power to said power circuit whenever said current determining means determines that said large current is flowing, and said decoded signal from said decoder means is not present.
Claim 36
Dependent Claim
21 words
The apparatus of claim 23, said display and actuator means comprising means for conveying a message upon activation of a switch.
Claim 37
Dependent Claim
21 words
The apparatus of claim 23, said display and actuator means comprising one or more of a digital display and sound transducer.
Claim 38
Dependent Claim
62 words
The apparatus of claim 36, further comprising: at least one user operable switch; a second transmitter circuit at said second location for transmission of coded signals representing a status of said at least one switch; and a second receiver circuit at said first location for activating or deactivating the transmitter circuit in response to the status of said at least one switch.
Claim 39
Dependent Claim
40 words
The apparatus of claim 36, said display and actuator means displaying a measurement corresponding to an encoded signal from an electrical transducer at said first location, said electrical transducer measuring one or more of a fluid temperature, or pressure level.
Claim 40
Independent Claim
156 words
A method for transmitting and receiving telemetry and control signals via an existing direct current power circuit, comprising: generating at a first location connected to said power circuit a pulsed signal coded according to a desired telemetry or control function, said pulsed signal being similar to a noise induced by existing electrical activity caused by other devices connected to said power circuit, but having a more regular and controlled periodicity, whereby said pulsed signal is prevented from interfering with other devices by existing precautions in said other devices directed to said noise but is discernable from said noise based on said more regular and controlled periodicity; imposing said pulsed signal on said power circuit; monitoring at a second location connected to said power circuit the presence of said pulsed signal in said power circuit; detecting said pulsed signal at said second location; and performing said desired telemetry or control function as a result of said detection.
Claim 41
Independent Claim
156 words
A method for transmitting and receiving telemetry and control signals via an existing direct current power circuit, comprising: generating at a first location connected to said power circuit a pulsed signal coded according to a desired telemetry or control function, said pulsed signal being similar to a noise induced by existing electrical activity caused by other devices connected to said power circuit, but having a more regular and controlled periodicity, whereby said pulsed signal is prevented from interfering with other devices by existing precautions in said other devices directed to said noise but is discernable from said noise based on said more regular and controlled periodicity; imposing said pulsed signal on said power circuit; monitoring at a second location connected to said power circuit the presence of said pulsed signal in said power circuit; detecting said pulsed signal at said second location; and performing said desired telemetry or control function as a result of said detection.
Claim 42
Dependent Claim
132 words
The method of claim 39, further comprising: generating at said second location a second pulsed signal representing a desired second telemetry or control function, said second pulsed signal being similar to said noise, but having a more regular and controlled periodicity, whereby said second pulsed signal is prevented from interfering with other devices by existing precautions in said other devices directed to said noise but is discernable from said noise based on said more regular and controlled periodicity; imposing said second pulsed signal on the said power circuit; monitoring at said first location the presence of said second pulsed signal in said power circuit; detecting said second pulsed signal at said first location; and performing said desired second telemetry or control function, as a result of said detection of said second signal.
References Cited (Backward Citations)
US1654450A
Cited
US2729750A
Cited
US2888611A
Cited
US3209326A
Cited
US3467835A
Cited
US3500119A
Cited
US3553472A
Cited
US3525875A
Cited
US3500120A
Cited
US3763415A
Cited
US3519837A
Cited
US3600596A
Cited
US3651454A
Cited
US3591845A
Cited
US3628085A
Cited
US3740713A
Cited
US3706005A
Cited
US3689886A
Cited
US3692965A
Cited
US4093945A
Cited
US3729710A
Cited
US3784839A
Cited
US3790806A
Cited
US3879617A
Cited
US3886534A
Cited
US3944981A
Cited
US3975708A
Cited
US3944742A
Cited
US3971010A
Cited
US3949289A
Cited
US3997870A
Cited
US4023138A
Cited
US4093946A
Cited
US4057742A
Cited
US4090089A
Cited
US4180043A
Cited
US4123748A
Cited
US4099157A
Cited
US4139801A
Cited
US4174517A
Cited
US4159467A
Cited
US4143368A
Cited
US4288778A
Cited
US4236594A
Cited
US4209709A
Cited
US4275440A
Cited
US4222034A
Cited
US4383242A
Cited
US4321681A
Cited
US4379284A
Cited
US4354268A
Cited
US4330716A
Cited
US4464765A
Cited
US4463341A
Cited
US4400761A
Cited
US4463340A
Cited
US4514719A
Cited
US4523178A
Cited
US4540875A
Cited
US4540890A
Cited
US4611274A
Cited
US4556866A
Cited
US4558260A
Cited
US4553127A
Cited
US4607246A
Cited
US4641322A
Cited
US4533889A
Cited
US4958084A
Cited
US4613791A
Cited
US4602127A
Cited
US4639714A
Cited
US4908498A
Cited
US4835533A
Cited
US4831560A
Cited
US4694408A
Cited
US4686423A
Cited
US4912553A
Cited
US4788542A
Cited
US5196823A
Cited
US4835514A
Cited
US4847782A
Cited
US4835764A
Cited
US4884055A
Cited
US4759050A
Cited
US4714912A
Cited
US4888575A
Cited
US4838377A
Cited
US4785195A
Cited
US4925750A
Cited
US5033112A
Cited
US4791311A
Cited
US4975847A
Cited
US4962456A
Cited
US4841199A
Cited
US4813443A
Cited
US4878173A
Cited
US5029124A
Cited
US4956580A
Cited
US4907222A
Cited
US5003476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |