US3781605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dc signal processing circuit
Assignee: Verizon Laboratories Inc
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Filing: 1972-12-04
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Granted: 1973-12-25
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Expires: 1992-12-04
Abstract
Abstract A dc signal processing circuit suitable for use in electronic control module for an automatic anti-skid braking system for vehicles such as automobiles. The processing circuit includes a differentiator-amplifier and comparator subcircuits. The differentiator subcircuit has applied an amplitude-varying dc ''''voltage'''' in direct proportion to the rotational velocity of the rear wheels. Instantaneous increases and decreases in the voltage level of the dc ''''velocity'''' voltage signal are detected by the differentiator-amplifier subcircuit to produce positivegoing and negative-going pulses, respectively, amplified, and inverted thereby. These signals are applied to the comparator subcircuit where the positive-going pulses are compared with a dc ''''deceleration'''' reference voltage level having a value corresponding to a predetermined value of wheel deceleration. If the amplitude of a positive-going pulse exceeds the value of the constant dc ''''deceleration'''' reference voltage level, an output pulse is produced by the comparator subcircuit to effect operation of the brake-control mechanism of the vehicle to release the brakes and allow the wheels to spin up.
Inventors
- 👤 L Emerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:50
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/16; G01P15/165; B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; Y; Y10; Y10S; Y10S188/00; Y10S188/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
711 words
A signal processing circuit for an automotive anti-skid braking system comprising: a source of reference potential providing a voltage signal at ground potential; voltage supply means having a first terminal and a second terminal and operative to supply a voltage signal to the first terminal, said second terminal being connected to the source of reference potential, said supply means includes an automotive storage battery; first differential amplifier circuit means having a first input terminal, a second input terminal, a first bias terminal, a second bias terminal, a common-point terminal, and an output terminal; means for coupling the first bias terminal of the first differential amplifier circuit meanS to the source of reference potential; means for coupling the second bias terminal of the first differential amplifier circuit means to the first terminal of the voltage supply means; first and second resistors connected in series between the first terminal of the voltage supply means and the source of reference potential and coupled at the juncture therebetween to the first input terminal of the first differential amplifier circuit means, said first and second resistors being operative to couple a voltage signal to the first input terminal of the first differential amplifier circuit means having a value less than the value of the voltage signal supplied by the voltage supply means at its first terminal; the common-point terminal of the first differential amplifier circuit means coupled to the juncture of the first and second resistors; an input signal terminal for receiving an amplitude-varying input signal; third means which includes a capacitance coupled to the input signal terminal and to the second input terminal of the first differential amplifier circuit means and operative in response to an amplitude-varying input signal received at the input signal terminal to produce and apply to the second input terminal of the first differential amplifier circuit means voltage signals corresponding to changes in a first direction in the value of the amplitude-varying input signal; said first differential amplifier circuit means being operative in response to the voltage signal at its first input terminal and each voltage signal at its second input terminal to produce an amplified output voltage signal at its output terminal having a value related to the difference between the value of the voltage signal at its first input terminal and the value of the voltage signal at its second input terminal; second differential amplifier circuit means having a first input terminal, a second input terminal, a first bias terminal, a second bias terminal, a common-point terminal, and an output terminal; means for coupling the first bias terminal of the second differential amplifier means to the source of reference potential; means for coupling the second bias terminal of the second differential amplifier circuit means to the first terminal of the voltage supply means; the common-point terminal of the second differential amplifier circuit means coupled to the juncture of the first and second resistors; reference means operative to supply a reference voltage signal to the second input terminal of the second differential amplifier circuit means; and fourth means operative to couple a voltage signal to the first input terminal of the second differential amplifier circuit means having a value related to the value of the output signal produced at the output terminal of the first differential amplifier circuit means; said fourth means includes a resistance connected in series between the output terminal of the first differential amplifier circuit means and the first input terminal of the second differential amplifier circuit means, and a resistance connected between the first input terminal of the second differential amplifier circuit means and the source of reference potential, said resistances coupling a voltage signal to the first input terminal of the second differential amplifier circuit means having a value less than the value of the output signal produced at the output terminal of the first differential amplifier circuit means; said second differential amplifier circuit means being operative to compare the value of the voltage signal applied to its first and second input terminals and to produce an output voltage signal at its output terminal in response to the value of the voltage signal at its first input terminal bearing a predetermined relationship to the value of the reference voltage signal at its second input terminal.
Claim 2
Dependent Claim
711 words
A signal processing circuit for an automotive anti-skid braking system comprising: a source of reference potential providing a voltage signal at ground potential; voltage supply means having a first terminal and a second terminal and operative to supply a voltage signal to the first terminal, said second terminal being connected to the source of reference potential, said supply means includes an automotive storage battery; first differential amplifier circuit means having a first input terminal, a second input terminal, a first bias terminal, a second bias terminal, a common-point terminal, and an output terminal; means for coupling the first bias terminal of the first differential amplifier circuit meanS to the source of reference potential; means for coupling the second bias terminal of the first differential amplifier circuit means to the first terminal of the voltage supply means; first and second resistors connected in series between the first terminal of the voltage supply means and the source of reference potential and coupled at the juncture therebetween to the first input terminal of the first differential amplifier circuit means, said first and second resistors being operative to couple a voltage signal to the first input terminal of the first differential amplifier circuit means having a value less than the value of the voltage signal supplied by the voltage supply means at its first terminal; the common-point terminal of the first differential amplifier circuit means coupled to the juncture of the first and second resistors; an input signal terminal for receiving an amplitude-varying input signal; third means which includes a capacitance coupled to the input signal terminal and to the second input terminal of the first differential amplifier circuit means and operative in response to an amplitude-varying input signal received at the input signal terminal to produce and apply to the second input terminal of the first differential amplifier circuit means voltage signals corresponding to changes in a first direction in the value of the amplitude-varying input signal; said first differential amplifier circuit means being operative in response to the voltage signal at its first input terminal and each voltage signal at its second input terminal to produce an amplified output voltage signal at its output terminal having a value related to the difference between the value of the voltage signal at its first input terminal and the value of the voltage signal at its second input terminal; second differential amplifier circuit means having a first input terminal, a second input terminal, a first bias terminal, a second bias terminal, a common-point terminal, and an output terminal; means for coupling the first bias terminal of the second differential amplifier means to the source of reference potential; means for coupling the second bias terminal of the second differential amplifier circuit means to the first terminal of the voltage supply means; the common-point terminal of the second differential amplifier circuit means coupled to the juncture of the first and second resistors; reference means operative to supply a reference voltage signal to the second input terminal of the second differential amplifier circuit means; and fourth means operative to couple a voltage signal to the first input terminal of the second differential amplifier circuit means having a value related to the value of the output signal produced at the output terminal of the first differential amplifier circuit means; said fourth means includes a resistance connected in series between the output terminal of the first differential amplifier circuit means and the first input terminal of the second differential amplifier circuit means, and a resistance connected between the first input terminal of the second differential amplifier circuit means and the source of reference potential, said resistances coupling a voltage signal to the first input terminal of the second differential amplifier circuit means having a value less than the value of the output signal produced at the output terminal of the first differential amplifier circuit means; said second differential amplifier circuit means being operative to compare the value of the voltage signal applied to its first and second input terminals and to produce an output voltage signal at its output terminal in response to the value of the voltage signal at its first input terminal bearing a predetermined relationship to the value of the reference voltage signal at its second input terminal.
Claim 3
Dependent Claim
46 words
A signal processing circuit in accordance with claim 1 wherein: the reference means includes a variable resistance coupled between the source of reference potential and the first terminal of the voltage supply means and to the second input terminal of the second differential amplifier circuit means.
Claim 4
Dependent Claim
55 words
A signal processing circuit in accordance with claim 1 wherein: the second differential amplifier circuit means is operative to produce an output voltage signal at its output terminal in response to the value of the voltage signal at its first input terminal exceeding the value of the reference voltage signal at its second input terminal.
Claim 5
Dependent Claim
99 words
A signal processing circuit in accordance with claim 3 wherein: the first input terminal of the first differential amplifier circuit means is a non-inverting input terminal, the second input terminal is an inverting input terminal, the first bias terminal is an inverting bias terminal, and the second bias terminal is a non-inverting bias terminal; and the first input terminal of the second differential amplifier circuit means is a non-inverting input terminal, the second input terminal is an inverting input terminal, the first bias terminal is an inverting bias terminal, and the second bias terminal is a non-inverting bias terminal.
Claim 6
Dependent Claim
44 words
A signal processing circuit in accordance with claim 4 further comprising: feedback means coupled between the output terminal and the inverting input terminal of the first differential amplifier circuit means for achieving a particular value of gain for the first differential amplifier circuit means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |