Patent US3167535A successfully refreshed from Google Patents.
US3729234A
Expired / Lapsed
US
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Brake control modulator
Assignee: Crane Co
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Filing: 1971-06-21
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Granted: 1973-04-24
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Expires: 1991-06-21
Abstract
Abstract A brake control is provided with a system for modifying the action of the brake application apparatus for the wheel of a vehicle. Information obtained from the rotation of the wheel is used to derive an analog signal indicating the braking condition. If the analog signal exceeds a predetermined threshold level, a modulating signal is produced. The modulating signal includes the time integral function of both the positive and negative variations of the analog signal from the threshold level. The circuitry for producing the modulating signal includes an integrating capacitor that is charged by said analog signal and that is discharged by current representing the predetermined threshold level.
Inventors
- 👤 E Hirzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:15
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1703; B60T8/32; B60T8/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
In a system for modifying the action of the brake application means for the wheel of a vehicle including electronic means responsive to rotation of said wheel for producing an analog error signal indicating a braking condition, the improvement comprising: means responsive to said analog error signal for producing a modulating brake control signal when said analog error signal exceeds a predetermined threshold level, said modulating brake control signal including a time integral function of both positive and negative variations of said analog error signal from said threshold level; and control means responsive to said modulating brake control signal for modifying the action of said brake application means in proportion to said modulatIng brake control signal.
Claim 2
Dependent Claim
116 words
In a system for modifying the action of the brake application means for the wheel of a vehicle including electronic means responsive to rotation of said wheel for producing an analog error signal indicating a braking condition, the improvement comprising: means responsive to said analog error signal for producing a modulating brake control signal when said analog error signal exceeds a predetermined threshold level, said modulating brake control signal including a time integral function of both positive and negative variations of said analog error signal from said threshold level; and control means responsive to said modulating brake control signal for modifying the action of said brake application means in proportion to said modulatIng brake control signal.
Claim 3
Dependent Claim
83 words
The invention defined in claim 1 wherein said means responsive to said analog error signal comprises: integrating energy storage means; means responsive to said analog error signal to produce a charging signal tending to charge said energy storage means; means for producing a predetermined discharge signal tending continuously to discharge said energy storage means and indicative of said predetermined threshold level; and means for producing said brake control signal as a function of the difference between said charging signal and said discharging signal.
Claim 4
Dependent Claim
80 words
The invention defined in claim 1 wherein said means responsive to said analog error signal comprises: integrating capacitor means; means responsive to said analog error signal to produce a charging current tending to charge said capacitor means; means for producing a predetermined discharge current tending continuously to discharge said capacitor means and indicative of said predetermined threshold level; and means for producing said brake control signal as a function of the difference between said charging current and said discharging current.
Claim 5
Dependent Claim
164 words
In a system for modifying the action of the brake application means for the wheel of a vehicle including electronic means utilizing information obtained from the rotation of said wheel for producing an error signal indicating a braking condition, the improvement comprising: modulation means responsive to said error signal for producing a modulating brake control signal when said error signal exceeds a predetermined threshold level, said modulation means including energy storage means, means responsive to said error signal to produce a charging signal tending to charge said energy storage means, means for producing a predetermined discharge signal tending continuously to discharge said energy storage means and indicative of said predetermined threshold level, means for producing said modulating brake control signal as a function of both positive and negative difference between said charging signal and said discharging signal; and control means responsive to said modulating brake control signal for modifying the action of said brake application means in proportion to said modulating brake control signal.
Claim 6
Dependent Claim
164 words
In a system for modifying the action of the brake application means for the wheel of a vehicle including electronic means utilizing information obtained from the rotation of said wheel for producing an error signal indicating a braking condition, the improvement comprising: modulation means responsive to said error signal for producing a modulating brake control signal when said error signal exceeds a predetermined threshold level, said modulation means including energy storage means, means responsive to said error signal to produce a charging signal tending to charge said energy storage means, means for producing a predetermined discharge signal tending continuously to discharge said energy storage means and indicative of said predetermined threshold level, means for producing said modulating brake control signal as a function of both positive and negative difference between said charging signal and said discharging signal; and control means responsive to said modulating brake control signal for modifying the action of said brake application means in proportion to said modulating brake control signal.
Claim 7
Dependent Claim
36 words
The invention defined in claim 4 wherein the rate of change of said modulating brake control signal is substantially a linear function of the magnitude of variation of said error signal from said predetermined threshold level.
Claim 8
Dependent Claim
28 words
The invention defined in claim 4 wherein said energy storage means comprises a capacitor means and wherein said charging signal and said discharge signal are each current signals.
Claim 9
Dependent Claim
218 words
In a system for modifying the action of the brake application means for the wheel of a vehicle including electronic means responsive to rotation of said wheel for producing a slip error signal, the improvement comprising: modulation means responsive to said slip error signal for producing a modulating brake control signal when said slip error signal exceeds a predetermined threshold level, said modulating brake control signal including a time integral function of both positive and negative variation of said slip error signal from said threshold level, said modulation means including energy storage means, means responsive to said slip error signal to produce a charging signal tending to charge said energy storage means, means for producing a predetermined discharge signal tending continuously to discharge said energy storage means and indicative of said predetermined threshold level, and means for producing said modulating brake control signal as a function of both positive and negative difference between said charging signal and said discharging signal, both positive and negative rates of change of said modulating brake control signal being substantially linear functions of the magnitude of variation of said error signal from said predetermined threshold level; and cOntrol means responsive to said modulating brake control signal for modifying the action of said brake application means in proportion to said modulating brake control signal.
Claim 10
Dependent Claim
218 words
In a system for modifying the action of the brake application means for the wheel of a vehicle including electronic means responsive to rotation of said wheel for producing a slip error signal, the improvement comprising: modulation means responsive to said slip error signal for producing a modulating brake control signal when said slip error signal exceeds a predetermined threshold level, said modulating brake control signal including a time integral function of both positive and negative variation of said slip error signal from said threshold level, said modulation means including energy storage means, means responsive to said slip error signal to produce a charging signal tending to charge said energy storage means, means for producing a predetermined discharge signal tending continuously to discharge said energy storage means and indicative of said predetermined threshold level, and means for producing said modulating brake control signal as a function of both positive and negative difference between said charging signal and said discharging signal, both positive and negative rates of change of said modulating brake control signal being substantially linear functions of the magnitude of variation of said error signal from said predetermined threshold level; and cOntrol means responsive to said modulating brake control signal for modifying the action of said brake application means in proportion to said modulating brake control signal.
Claim 11
Dependent Claim
28 words
The invention defined in claim 7 wherein said energy storage means comprises a capacitor means and wherein said charging signal and said discharge signal are each current signals.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |