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Patent US4370561A successfully refreshed from Google Patents.
US4370561A
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Vehicle multiplex system
Assignee: Intersil Corp
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Filing: 1980-11-28
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Granted: 1983-01-25
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Expires: 2000-11-28
Abstract
Abstract A vehicle multiplex system includes a power conductor for conveying electrical power to power-operated units on the vehicle, and a single signal conductor for controlling the connections of power to power-operated units. A multiplex timing unit applys a tri-state timing waveform to the signal conductor. Each of a plurality of control signal transmitters is operative in response to a physical command to apply a corresponding control signal to the signal conductor during a control time period in a channel interval assigned to the particular transmitter. And, each of a plurality of control signal receivers is operative to control the connection of electrical power from the power conductor to a power-operated unit in response to a control signal received from the signal conductor during a control time period in a channel interval assigned to the particulate receiver.
Inventors
- 👤 George R. Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:20
CPC Classifications
G; G08; G08C; G08C15/00; G08C15/06; G08C15/12; B; B60; B60R; B60R16/00; B60R16/02; B60R16/03; B60R16/0315
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
157 words
A vehicle multiplex system, comprising a power conductor for conveying electrical power to power-operated units on the vehicle, a signal conductor, a multiplex timing unit for applying a tri-state timing waveform to said signal conductor, said waveform including a master timing interval followed by a plurality of sequential channel intervals, each channel interval including a control time period during which the timing unit allows the voltage on the signal conductor to float, a plurality of control signal transmitters each operative in response to a physical command to apply a corresponding control signal to the signal conductor during a control time period in a channel interval assigned to the transmitter, and a plurality of control signal receivers each operative to control the connection of electrical power from the power conductor to a power-operated unit in response to a control signal received from the signal conductor during a control time period in a channel interval assigned to the receiver.
Claim 2
Dependent Claim
157 words
A vehicle multiplex system, comprising a power conductor for conveying electrical power to power-operated units on the vehicle, a signal conductor, a multiplex timing unit for applying a tri-state timing waveform to said signal conductor, said waveform including a master timing interval followed by a plurality of sequential channel intervals, each channel interval including a control time period during which the timing unit allows the voltage on the signal conductor to float, a plurality of control signal transmitters each operative in response to a physical command to apply a corresponding control signal to the signal conductor during a control time period in a channel interval assigned to the transmitter, and a plurality of control signal receivers each operative to control the connection of electrical power from the power conductor to a power-operated unit in response to a control signal received from the signal conductor during a control time period in a channel interval assigned to the receiver.
Claim 3
Dependent Claim
56 words
A vehicle multiplex system according to claim 1 wherein said multiplex timing unit includes an oscillator, a sub-interval counter and logic operated from said oscillator to generate said timing waveform during each channel interval, and a channel interval counter and logic operated from said first counter to generate said timing waveform during each master timing interval.
Claim 4
Dependent Claim
92 words
A vehicle multiplex system according to either claim 1 or 2 wherein each of said control signal transmitters includes a gated oscillator which is turned on by transitions of one polarity in said timing waveform, channel sub-interval counter means responsive to the output of said oscillator to define a transmit interval during each channel interval, and channel interval counter means responsive to an output of said sub-interval counter to enable the transmittal of a control signal to the signal conductor during a predetermined channel interval assigned to the respective control signal transmitter.
Claim 5
Dependent Claim
92 words
A vehicle multiplex system according to either claim 1 or 2 wherein each of said control signal receivers includes a gated oscillator which is turned on by transitions of one polarity in said timing waveform, channel sub-interval counter means responsive to the output of said oscillator to define a receive interval during each channel interval, and channel interval counter means responsive to an output of said sub-interval counter to enable the reception of a control signal from the signal conductor during a predetermined channel interval assigned to the respective control signal receiver.
Claim 6
Dependent Claim
35 words
A vehicle multiplex system according to claim 3 wherein a control signal transmitter and a control signal receiver share a single gated oscillator, a single sub-interval counter means and a single channel interval counter means.
Claim 7
Dependent Claim
45 words
A vehicle multiplex system according to claim 1, and in addition the inclusion of low-pass filters between said multiplex timing unit and said signal conductor, and between said transmit unit and said signal conductor, to prevent the application of radio-frequency components to said signal line.
Claim 8
Dependent Claim
36 words
A vehicle multiplex system according to claim 1, wherein the multiplex timing unit couples said timing waveform to said signal conductor at a low impedance which suppresses the induction of noise voltages on the signal conductor.
Claim 9
Dependent Claim
41 words
A vehicle multiplex system according to claim 1 wherein each of said control signal receivers includes a low-pass filter, and a Schmitt trigger which is responsive to a received control signal and is relatively unresponsive to noise on the signal conductor.
Claim 10
Dependent Claim
50 words
A vehicle multiplex system according to claim 1 wherein at least one of said control signal transmitters includes a tri-state driver for applying control signals to the signal conductor, and includes fail-safe diode and capacitor means to prevent a short circuit in said driver from disabling the entire multiplex system.
Claim 11
Dependent Claim
35 words
A vehicle multiplex system according to claim 4 wherein a control signal transmitter and a control signal receiver share a single gated oscillator, a single sub-interval counter means and a single channel interval counter means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |