Patent US6470231B1 successfully refreshed from Google Patents.
US3887239A
Expired / Lapsed
US
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Method and apparatus for controlling the speed of a vehicle
Assignee: Knorr Brake Holding Corp
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Filing: 1973-03-05
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Granted: 1975-06-03
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Expires: 1993-03-05
Abstract
Abstract Apparatus is provided for controlling the speed of a vehicle, especially vehicles of a railway train, wherein accelerationimparting mechanisms associated with the wheels are adjusted on an individual basis by comparison of tangential speed and desired speed sensors to maintain tangential speeds of the wheels equal to each other, and equal to a predetermined value. The technique may be employed in either the braking or the propulsion mode of operation, or in both modes, and allows commanded rates of vehicle acceleration to be realized to the greatest possible extent.
Inventors
- 👤 Thomas H Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:00
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/72; F16D65/74; B; B60; B60T; B60T8/00; B60T8/18; B60T8/1893; B60T8/32; B60T8/321; B60T8/3235; B60T8/34; B60T8/48; B60T8/4809; B61; B61C; B61C15/00; B61C15/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
132 words
A vehicle control system having brakes for controlling the several wheels of a vehicle and control apparatus governing braking in accordance with sensing desired and actual vehicle speeds wherein the improvement comprises; a. first means for sensing a desired speed for the vehicle, b. second sensing means for sensing actual tangential tread speed for one wheel of the vehicle and for generating a feedback signal characteristic of the speed of the wheel, c. frequency generating means governed jointly by the first sensing means and the feedback signal of the second sensing means for generating a master frequency signal, d. adhesion control means for selectively governing braking torque on said one wheel in accordance with a comparsion of the master frequency signal and the tangential tread speed sensed by the second sensing means.
Claim 2
Dependent Claim
132 words
A vehicle control system having brakes for controlling the several wheels of a vehicle and control apparatus governing braking in accordance with sensing desired and actual vehicle speeds wherein the improvement comprises; a. first means for sensing a desired speed for the vehicle, b. second sensing means for sensing actual tangential tread speed for one wheel of the vehicle and for generating a feedback signal characteristic of the speed of the wheel, c. frequency generating means governed jointly by the first sensing means and the feedback signal of the second sensing means for generating a master frequency signal, d. adhesion control means for selectively governing braking torque on said one wheel in accordance with a comparsion of the master frequency signal and the tangential tread speed sensed by the second sensing means.
Claim 3
Dependent Claim
132 words
A vehicle control system having brakes for controlling the several wheels of a vehicle and control apparatus governing braking in accordance with sensing desired and actual vehicle speeds wherein the improvement comprises; a. first means for sensing a desired speed for the vehicle, b. second sensing means for sensing actual tangential tread speed for one wheel of the vehicle and for generating a feedback signal characteristic of the speed of the wheel, c. frequency generating means governed jointly by the first sensing means and the feedback signal of the second sensing means for generating a master frequency signal, d. adhesion control means for selectively governing braking torque on said one wheel in accordance with a comparsion of the master frequency signal and the tangential tread speed sensed by the second sensing means.
Claim 4
Dependent Claim
132 words
A vehicle control system having brakes for controlling the several wheels of a vehicle and control apparatus governing braking in accordance with sensing desired and actual vehicle speeds wherein the improvement comprises; a. first means for sensing a desired speed for the vehicle, b. second sensing means for sensing actual tangential tread speed for one wheel of the vehicle and for generating a feedback signal characteristic of the speed of the wheel, c. frequency generating means governed jointly by the first sensing means and the feedback signal of the second sensing means for generating a master frequency signal, d. adhesion control means for selectively governing braking torque on said one wheel in accordance with a comparsion of the master frequency signal and the tangential tread speed sensed by the second sensing means.
Claim 5
Dependent Claim
47 words
A vehicle control system according to claim 1 wherein the adhesion control means comprises a pressure control valve for governing braking pressure on said one wheel in accordance with a comparison of the master frequency signal and the tangential tread speed sensed by the second sensing means.
Claim 6
Dependent Claim
61 words
A vehicle control system according to claim 2 wherein means is provided for converting the master signal to a torsional force which is compared with a torsional output of the second sensing means to develop a variable pressure in the control valve in accordance with a difference between the master frequency signal and the torsional output of the second sensing means.
Claim 7
Dependent Claim
47 words
A vehicle control system according to claim 3 wherein the control valve has a reciprocating spool that is axially operable to supply, lap and exhaust positions selectively in response to a phase difference in comparison of torsional inputs characteristic of master frequency and actual speed signals, respectively.
Claim 8
Dependent Claim
41 words
A vehicle control system according to claim 4 wherein the control valve has a reciprocating sleeve operable in accordance with relative positions of the reciprocating spool to deliver a braking control pressure variable in accordance with axial movement of the spool.
Claim 9
Dependent Claim
53 words
A vehicle control system according to claim 1 wherein the first sensing means comprises; a. a master signal generator for generating an output signal having a frequency characteristic of a selected desired speed for the vehicle and b. means for translating the frequency signal into a torsional output characteristic of instantaneous desired speed.
Claim 10
Dependent Claim
62 words
A vehicle control system according to claim 6 wherein the second sensing means comprises; a. means for generating a torsional output proportional to the actual speed of said one wheel, and b. means for generating a feedback signal proportional to the actual speed of said one wheel for governing the rate of change of the frequency characteristic of said one sensing meAns.
Claim 11
Dependent Claim
60 words
A vehicle control system according to claim 7 wherein the master signal generator has a. means for comparing a designated speed signal with the feedback signal, b. means for modifying the designated speed signal by output of the comparing means, and c. means for converting output of the modifying means into a frequency signal for translation into the torsional output.
Claim 12
Dependent Claim
54 words
A vehicle control system according to claim 1 wherein an auxiliary brake pressure control system is provided for response to emergency brake designating means and a two way check valve is provided for governing the brakes selectively by the auxiliary brake pressure or by pressure from the adhesion control means, whichever is the greater.
Claim 13
Dependent Claim
49 words
A vehicle control system according to claim 1 wherein the vehicle comprises; a. a propulsion motor for driving at least said one wheel, and b. speed control means for modulating power applied by the motor to said one wheel in accordance with the condition of the adhesion control means.
Claim 14
Dependent Claim
52 words
A vehicle control system according to claim 10 wherein the adhesion control means delivers an output selectively to the speed control means for the motor or to the brakes in accordance with whether a signal from the first sensing means is greater or less than a signal of the second sensing means.
Claim 15
Dependent Claim
40 words
A vehicle control system according to claim 11 wherein the signals from the first and second sensing means are torsional and the adhesion control means adjusts a control pressure output for governing power applied by the motor and brakes selectively.
Claim 16
Dependent Claim
34 words
A vehicle control system according to claim 12 wherein the control pressure output of the adhesion control means is proportional to phase displacement between a torsional signal of the first and second sensing means.
Claim 17
Dependent Claim
34 words
A vehicle control system according to claim 13 wherein the torsional signals of the first and second sensing means are respectively proportional to the desired speed and the actual speed of said one wheel.
Claim 18
Dependent Claim
82 words
A vehicle control system according to claim 14 wherein the adhesion control means comprises a control valve having; a. a spool operable axially selectively to supply and exhaust positions in accordance with a phase difference between the first and second sensing means, b. a sleeve coaxial with the spool and cooperating therewith to govern the output control pressure, and c. means including biasing springs at the ends of the sleeve is provided for governing the maximum pressure output of the control valve.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |