US3622973A
Expired / Lapsed
US
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Wheel slip detection device
Assignee: Robert Bosch GmbH
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Filing: 1969-11-24
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Granted: 1971-11-23
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Expires: 1989-11-24
Abstract
Abstract To detect transition from rolling to sliding of a wheel over a surface, a transducer coupled to the wheel provides output pulses having a repetition rate representative of wheel speed. The pulses are applied to a logic circuit including a bistable and a monostable multivibrator. An integrating circuit controls the unstable time of the monostable multivibrator in dependence on pulse repetition rate; sudden change in pulse rate itself is sensed by applying the pulses from the bistable and monostable multivibrators to a coincidence gate which activates a wheel slip detector (and, if desired, an override control to a brake, or accelerating arrangement for the wheel).
Inventors
- 👤 Helmut H Domann
- 👤 Klaus H Christ
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:33
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/72; B60L; B60L3/00; B60L3/10; B60T8/17; B60T8/172; B60T8/321; B60T8/329; G; G01; G01P; G01P15/00; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/50; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
168 words
Slip detection device to detect transition from rolling to slipping of a wheel (11) over a surface (12) upon acceleration, or deceleration of the wheel, comprising transducer means (18) coupled to the wheel and providing output pulses (118) having a repetition rate representative of wheel speed; a bistable multivibrator circuit (26) connected to said transducer means and triggered thereby, said bistable circuit (26) changing state upon occurrence of each pulse; circuit means (28, 31, 32) connected to the output of said bistable multivibrator circuit whereby said circuit means will have pulses having a repetition rate proportional to said repetition rate representative of wheel speed applied thereto, said circuit means sensing elapsed time between pulses; means (29) sensing change of elapsed time between pulses exceeding a predetermined amount of change, said sensing means having its input connected to the output of said bistable multivibrator circuit and to said circuit means (28, 31, 32) sensing elapsed time between pulses; and means (33) deriving an output signal from said sensing means.
Claim 2
Dependent Claim
168 words
Slip detection device to detect transition from rolling to slipping of a wheel (11) over a surface (12) upon acceleration, or deceleration of the wheel, comprising transducer means (18) coupled to the wheel and providing output pulses (118) having a repetition rate representative of wheel speed; a bistable multivibrator circuit (26) connected to said transducer means and triggered thereby, said bistable circuit (26) changing state upon occurrence of each pulse; circuit means (28, 31, 32) connected to the output of said bistable multivibrator circuit whereby said circuit means will have pulses having a repetition rate proportional to said repetition rate representative of wheel speed applied thereto, said circuit means sensing elapsed time between pulses; means (29) sensing change of elapsed time between pulses exceeding a predetermined amount of change, said sensing means having its input connected to the output of said bistable multivibrator circuit and to said circuit means (28, 31, 32) sensing elapsed time between pulses; and means (33) deriving an output signal from said sensing means.
Claim 3
Dependent Claim
112 words
Device according to claim 1, wherein said means sensing the change of elapsed time includes a coincidence gate (29); and said circuit means includes a first monostable multivibrator (28), and a second monostable multivibrator (31); the pulses (126) from said bistable multivibrator (26) being connected to said first monostable multivibrator (28) and to said second monostable multivibrator (31), the output of said bistable multivibrator being further applied to said coincidence gate (29); the output of said second multivibrator (31) being applied to a second input of said coincidence gate (29); and said second multivibrator (31) has an unstable time representative of elapsed time between pulses applied thereto by said bistable multivibrator (26).
Claim 4
Dependent Claim
26 words
Device according to claim 2, wherein the pulses applied to the input of said second monostable multivibrator (31) are connected through said first monostable multivibrator (28).
Claim 5
Dependent Claim
34 words
Device according to claim 2, including an integrating network having the pulses representative of the pulses from said bistable multivibrator (26) applied thereto and controlling the unstable period of said second monostable multivibrator (31).
Claim 6
Dependent Claim
47 words
Device according to claim 1, in combination with a vehicle braking system, said means (33) deriving an output signal being connected to the vehicle braking system and supplying a control signal thereto upon detection of change of elapsed time between pulses in excess of a predetermined value.
Claim 7
Dependent Claim
62 words
Device according to claim 1, wherein said transducer means includes a magnetic transducer wheel mechanically coupled to said wheel (11), said transducer wheel having intermittently magnetic material located along its circumference; and a yoke cooperating with said intermittent magnetic material, and a coil associated therewith, said coil having pulses induced therein upon rotatiOn of said transducer wheel with respect to said yoke.
Claim 8
Dependent Claim
33 words
Device according to claim 6, wherein said transducer wheel comprises a plurality of magnets located at the circumference thereof, and of adjacent opposite polarity, and located in a magnetic circuit with said yoke.
Claim 9
Dependent Claim
29 words
Device according to claim 6, wherein said transducer wheel comprises a plurality of salient poles of ferromagnetic material and said coil is connected to a source of direct current.
Claim 10
Dependent Claim
49 words
Device according to claim 1, wherein said transducer means includes an optical transducer having a source of light and a light-sensitive element, and a movable reflector secured to rotate with said wheel (11) and reflecting light from said source to said photosensitive element, intermittently, upon rotation of said wheel.
Claim 11
Dependent Claim
84 words
Device according to claim 1, wherein said circuit means includes an integrating circuit (32) having pulses with a repetition rate proportional to the repetition rate of the pulses from said bistable multivibrator applied thereto and providing an electrical representation of average elapsed time between said pulses; and said means sensing change of elapsed time between pulses includes a coincidence circuit connected to and comparing the elapsed time between adjacent pulses (126) from said bistable multivibrator (26) with said electrical representation of averaged elapsed time.
Claim 12
Dependent Claim
77 words
Device according to claim 10, wherein said circuit means includes a monostable flip-flop circuit (31), said integrating circuit (32) controlling the duration of unstable state of said flip-flop circuit (31) in accordance with an integrated value of elapsed time between a plurality of pulses; and said coincidence circuit compares the timing of the output (131) of said monostable flip-flop circuit (31) with the occurrence, in time, of the output pulses (126) from said bistable multivibrator circuit (26).
Claim 13
Dependent Claim
48 words
Device according to claim 1, in combination with a vehicle-driving system (15'', 16'', 17''), said means (33'') deriving an output signal being connected to the vehicle-driving system and supplying a control signal thereto upon detection of increase of repetition rate of pulses in excess of a predetermined value.
Claim 14
Dependent Claim
95 words
Device according to claim 5, further in combination with a vehicle driving system, a pair of integrating circuits (32, 32'') having pulses with a repetition rate proportional to the repetition rate of said output pulses applied thereto, each said integrating circuits providing an electrical representation of average elapsed time between pulses; and said means sensing change of elapsed time between pulses including first coincidence circuit comparing elapsed time between adjacent pulses with said electrical representation of average elapsed time and a second coincidence circuit comparing repetition rate with said electrical representation of average elapsed time.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |