US3782783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmed oscillator circuit and fixed threshold variable duty cycle pulse generator
Assignee: Texas Instruments Inc
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Filing: 1972-07-27
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Granted: 1974-01-01
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Expires: 1992-07-27
Abstract
Abstract Disclosed is a signal generator in a vehicle skid control braking system for selectively actuating a brake control means in a repetitious or pulsing mode which selectively controls the engagement and disengagement of the braking system of a vehicle in accordance with selected braking conditions and velocity conditions of the wheels of the vehicle. The signal generator comprises a programmable oscillator circuit having a programmable rate of oscillation responsive to a first input signal representing acceleration conditions of the wheels, and a pulse generator responsive to the programmable oscillator circuit for selectively generating an oscillatory output signal comprising a series of pulses. The oscillatory output signal exhibits a programmable duty cycle responsive to the acceleration condition and is effective to selectively actuate the brake control means in a repetitive pulsing manner to thereby decrease vehicle velocity.
Inventors
- 👤 J Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:48
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/172
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
In a vehicle skid control braking system having a brake control means that selectively controls the engagement and disengagement of the braking system of a vehicle in accordance with selected braking conditions, a signal generator for selectively actuating said brake control means comprising in combination: a. programmable oscillator circuit means having a programmable rate of oscillation responsive to a first input signal representing a first condition of the vehicle wheels for generating a first oscillating signal exhibiting a rate of oscillation representative of said first condition; and b. pulse generator circuit means responsive to said first oscillating signal for selectively generating a second oscillatory signal comprising a series of pulses and exhibiting a programmable duty cycle representing said first condition; said second oscillatory signal effective to selectively actuate said brake control means in a repetiTive pulsing manner to thereby decrease vehicle wheel velocity.
Claim 2
Dependent Claim
143 words
In a vehicle skid control braking system having a brake control means that selectively controls the engagement and disengagement of the braking system of a vehicle in accordance with selected braking conditions, a signal generator for selectively actuating said brake control means comprising in combination: a. programmable oscillator circuit means having a programmable rate of oscillation responsive to a first input signal representing a first condition of the vehicle wheels for generating a first oscillating signal exhibiting a rate of oscillation representative of said first condition; and b. pulse generator circuit means responsive to said first oscillating signal for selectively generating a second oscillatory signal comprising a series of pulses and exhibiting a programmable duty cycle representing said first condition; said second oscillatory signal effective to selectively actuate said brake control means in a repetiTive pulsing manner to thereby decrease vehicle wheel velocity.
Claim 3
Dependent Claim
47 words
The signal generator of claim 1 wherein said oscillator circuit means is further responsive to a second input signal representing a second condition of the vehicle wheels for selectively inhibiting said oscillator circuit means to thereby provide a substantially zero rate of oscillation during said second condition.
Claim 4
Dependent Claim
26 words
The signal generator of claim 2 wherein said first condition is rate of acceleration and said second condition is rate of deceleration exceeding a predetermined value.
Claim 5
Dependent Claim
66 words
The signal generator of claim 3 wherein said oscillating circuit means comprises: a. an oscillation rate programmer circuit responsive to said first and second input signals for selectively providing a varying bias signal; and b. a rate dependent oscillator circuit having a rate of oscillation responsive to said bias signal for providing said first oscillatory signal indicative of rate of acceleration of the vehicle wheel speed.
Claim 6
Dependent Claim
109 words
The signal generator of claim 4 wherein said pulse generator circuit means comprises: a. a voltage level detector responsive to said first oscillatory signal for selectively providing a detector signal when said first oscillatory signal exceeds a preselected threshold level; and b. a latch circuit responsive to said detector signal for providing said second oscillatory signal comprising a series of pulses indicative of acceleration, wherein said latch circuit provides said second oscillatory signal in a first logic state when said first oscillatory signal is less than said preselected level, and provides said second oscillatory signal in a second logic state when said first oscillatory signal exceeds said preselected level.
Claim 7
Dependent Claim
82 words
The signal generator of claim 2 and further including a logic circuit means responsive to said second oscillatory signal, said second input signal, and a third signal indicative of a zero wheel velocity, to provide a third oscillatory signal proportional to said second oscillatory signal in the absence of actuation by said second input signal or by said third signal, said third oscillatory signal effective to selectively activate said brake control means in a pulsing manner to thereby decrease vehicle wheel velocity.
Claim 8
Dependent Claim
34 words
The signal generator of claim 6 wherein said third oscillatory signal selectively comprises: a. said second oscillatory signal having pulses; and b. an additional pulse responsive to said second condition of the vehicle wheels.
Claim 9
Dependent Claim
27 words
The signal generator of claim 5 wherein said oscillation rate programmer comprises first and second transistors having commonly connected base terminals coupled to said first input signal.
Claim 10
Dependent Claim
38 words
The signal generator of claim 8 wherein said rate dependent oscillator comprises a third transistor coupled to said oscillation rate programmer having an output terminal for providing said first oscillatory signal which is capacitively coupled to circuit ground.
Claim 11
Dependent Claim
34 words
The signal generator of claim 9 wherein said level detector comprises fourth and fifth transistors having commonly connected emitter terminals, and the base of said fourth transistor coupled to receive said first oscillatory signal.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |