US3754797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skid control system
Assignee: Robert Bosch GmbH
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Filing: 1971-11-12
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Granted: 1973-08-28
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Expires: 1991-11-12
Abstract
Abstract An antilocking control system for controlling brake pressure in a vehicle. A first reference signal generator and a second reference signal generator are provided. The two reference signal generators each develops a separate reference signal which approximates in its time sequence the speed of the vehicle. The second reference signal is lower in value than the first reference signal. A wheel speed sensor is provided for supplying a signal which corresponds to wheel speed. The signal which corresponds to wheel speed is compared alternatingly with the two reference signals in a comparison circuit which develops, as its output, a control signal. A valve arrangement responsive to the control signal controls fluid pressure.
Inventors
- 👤 A Rodi
- 👤 W Korasiak
- 👤 H Leiber
- 👤 W Jonner
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; B60T8/173
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
255 words
In an antilocking control system having a first means for developing a first electrical reference signal which corresponds in its time sequence to the speed of a vehicle, means for developing an electrical Signal which is an electrical representation of the rotational speed of a braked wheel of said vehicle, and signal-responsive means for controlling brake pressure, the improvement comprising: a. second means for developing a second electrical reference signal which corresponds in its time sequence to the speed of such vehicle and is lower in value than said first electrical reference signal; b. comparison means having 1. first input means for receiving said electrical signal which is an electrical representation of the rotational speed of the braked wheel, 2. second input means for receiving said electrical reference signals, and 3. output means for putting out signals for controlling said brake pressure control means; and c. switching and circuit means interconnecting said two input means of said comparison means with said three signal developing means and said output means of said comparison means with said brake pressure control means such that there are applied to the brake pressure control means signals which result from the alternating comparison of the signal which is an electrical representation of the rotational speed of the braked wheel with the two reference signals, whereby said brake pressure control means may be actuated when said rotational speed of said wheel is lower than respective reference values corresponding alternatingly to said first electrical reference signal and to said second electrical reference signal.
Claim 2
Dependent Claim
255 words
In an antilocking control system having a first means for developing a first electrical reference signal which corresponds in its time sequence to the speed of a vehicle, means for developing an electrical Signal which is an electrical representation of the rotational speed of a braked wheel of said vehicle, and signal-responsive means for controlling brake pressure, the improvement comprising: a. second means for developing a second electrical reference signal which corresponds in its time sequence to the speed of such vehicle and is lower in value than said first electrical reference signal; b. comparison means having 1. first input means for receiving said electrical signal which is an electrical representation of the rotational speed of the braked wheel, 2. second input means for receiving said electrical reference signals, and 3. output means for putting out signals for controlling said brake pressure control means; and c. switching and circuit means interconnecting said two input means of said comparison means with said three signal developing means and said output means of said comparison means with said brake pressure control means such that there are applied to the brake pressure control means signals which result from the alternating comparison of the signal which is an electrical representation of the rotational speed of the braked wheel with the two reference signals, whereby said brake pressure control means may be actuated when said rotational speed of said wheel is lower than respective reference values corresponding alternatingly to said first electrical reference signal and to said second electrical reference signal.
Claim 3
Dependent Claim
10 words
second input means for receiving said electrical reference signals, and
Claim 4
Dependent Claim
10 words
second input means for receiving said electrical reference signals, and
Claim 5
Dependent Claim
60 words
The improved antilocking control system as defined in claim 1 wherein two input means of the switching means are connected to the two said means for developing the electrical reference signals, and the output means of the switching means is connected to the second input means of the comparison means for alternatingly coupling one reference signal to the comparison means.
Claim 6
Dependent Claim
50 words
The improved antilocking control system as defined in claim 2 wherein said switching means has a control input means, and further comprising a free-running pulse generator means having an output means, said control input means of said switching means being coupled to said output means of said pulse generator means.
Claim 7
Dependent Claim
124 words
output means for putting out signals for controlling said brake pressure control means; and c. switching and circuit means interconnecting said two input means of said comparison means with said three signal developing means and said output means of said comparison means with said brake pressure control means such that there are applied to the brake pressure control means signals which result from the alternating comparison of the signal which is an electrical representation of the rotational speed of the braked wheel with the two reference signals, whereby said brake pressure control means may be actuated when said rotational speed of said wheel is lower than respective reference values corresponding alternatingly to said first electrical reference signal and to said second electrical reference signal.
Claim 8
Dependent Claim
124 words
output means for putting out signals for controlling said brake pressure control means; and c. switching and circuit means interconnecting said two input means of said comparison means with said three signal developing means and said output means of said comparison means with said brake pressure control means such that there are applied to the brake pressure control means signals which result from the alternating comparison of the signal which is an electrical representation of the rotational speed of the braked wheel with the two reference signals, whereby said brake pressure control means may be actuated when said rotational speed of said wheel is lower than respective reference values corresponding alternatingly to said first electrical reference signal and to said second electrical reference signal.
Claim 9
Dependent Claim
151 words
The improved antilocking control system as defined in claim 2 wherein said switching means has a control input means and in a rest position couples said first electrical reference signal to said second input means of said comparison circuit means, and further comprising a pulse producing timing circuit means having an input means and an output means, said input means of said timing circuit means being coupled to said output means of said comparison circuit means and said control input means of said switching means being coupled to said output means of said timing circuit means, whereby said switching circuit means alternatingly couples said first electrical reference signal and said second electrical reference signal to said one input means of said comparison circuit means whenever said comparison circuit means produces a signal indicating said braked wheel speed is less than an upper reference value corresponding to said first electrical reference signal.
Claim 10
Dependent Claim
78 words
The antilocking control system as defined in claim 2 wherein said switching means has control input means and in a rest position couples said second electrical reference signal to said second input means of said comparison circuit means, and further comprising means responsive to output from said comparison circuit means for producing switching signal pulses for a limited period of time and means for coupling said switching signal pulses to said control input means of said switching means.
Claim 11
Dependent Claim
36 words
The antilocking control system as defined in claim 5 wherein said means for producing switching signal pulses comprise means for producing switching signal pulses having a pulse duration/pulse interval ratio which varies in dependence on time.
Claim 12
Dependent Claim
51 words
The antilocking control system as defined in claim 5 further comprising means for developing signals directly relatEd to rate of change in velocity of said braked wheel, and means for coupling said signals directly related to given rate of change in velocity to said control input means of said switching means.
Claim 13
Dependent Claim
60 words
The antilocking control system as defined in claim 7 wherein said means for developing signals directly related to rate of change in velocity of said braked wheel comprises means for developing a deceleration signal indicating rotational deceleration is greater than a certain threshold value and for developing an acceleration signal indicating rotational acceleration is greater than a given threshold value.
Claim 14
Dependent Claim
53 words
The antilocking control system as defined in claim 8 wherein said means for developing signals directly related to rate of change in velocity includes means for developing an additional acceleration signal indicating rotational acceleration is greater than a given second acceleration threshold value which is greater than the first said given threshold value.
Claim 15
Dependent Claim
45 words
The antilocking control system as defined in claim 7 further comprising logic circuit means responsive to said signals directly related to said rate of change in velocity for developing control signals, and means for coupling said control signals to said means for controlling brake pressure.
Claim 16
Dependent Claim
218 words
An antilocking control system for controlling brake pressure in a vehicle comprising, in combination: a. means for producing a first electrical reference signal which approximates in its time sequence the speed of said vehicle; b. means for producing a second electrical reference signal which approximates in its time sequence the speed of such vehicle and which is lower than said first reference signal; c. sensing means responsive to the rotational speed of a braked wheel of such vehicle for producing an electrical signal directly corresponding to said rotational speed; d. comparison means having an output means and two input means for developing an output signal on said output means whenever an input signal applied to one of its input means falls below an input signal applied to the other of its input means, said electrical signal directly corresponding to said rotational speed being coupled to said one input means; e. signal controlled switching means coupled between each of said means for producing reference signals and said other input means of said comparison means for alternatingly supplying said first reference signal and said second reference signal to said comparison means; and f. pressure control means responsive to said output signal from said output means of said comparison means for reducing brake pressure upon the occurrence of said output signal.
Claim 17
Dependent Claim
218 words
An antilocking control system for controlling brake pressure in a vehicle comprising, in combination: a. means for producing a first electrical reference signal which approximates in its time sequence the speed of said vehicle; b. means for producing a second electrical reference signal which approximates in its time sequence the speed of such vehicle and which is lower than said first reference signal; c. sensing means responsive to the rotational speed of a braked wheel of such vehicle for producing an electrical signal directly corresponding to said rotational speed; d. comparison means having an output means and two input means for developing an output signal on said output means whenever an input signal applied to one of its input means falls below an input signal applied to the other of its input means, said electrical signal directly corresponding to said rotational speed being coupled to said one input means; e. signal controlled switching means coupled between each of said means for producing reference signals and said other input means of said comparison means for alternatingly supplying said first reference signal and said second reference signal to said comparison means; and f. pressure control means responsive to said output signal from said output means of said comparison means for reducing brake pressure upon the occurrence of said output signal.
Claim 18
Dependent Claim
38 words
The antilocking control system as defined in claim 11 wherein said signal controlled switching means includes a switching signal input means, and further comprising a pulse generator means for supplying switching signals to said switching signal input means.
Claim 19
Dependent Claim
30 words
The antilocking control system as defined in claim 12 wherein said pulse generator means comprises a pulse generator means for producing pulse signals having a variable pulse duration/pulse interval characteristic.
Claim 20
Dependent Claim
78 words
The antilocking control system as defined in claim 11 wherein said switching means includes a switching signal input means and in a rest state couples said first reference signal to said other input means of said comparison means, and further comprising a delayed action timing circuit means responsive to said output signal from said output means of said comparison means for supplying switching signals to said switching signal input means to effect switching to said second reference signal.
Claim 21
Dependent Claim
108 words
The antilocking control system as defined in claim 11 wherein said switching means includes a switching signal input means an in its rest state couples said second reference signal to said other input means of said comparison means, and further comprising means for sensing rate of change in velocity of said braked wheel for producing signals directIng said rate of change in velocity exceeds threshold, and means for coupling said signals indicating said rate of change exceeds threshold to said switching signal input means whereby a switching to said first reference signal is effected when rotational deceleration and/or rotational acceleration of said braked wheel exceed corresponding threshold values.
Claim 22
Dependent Claim
72 words
The antilocking control system as defined in claim 15, further including a timing circuit means, and a pulse generator; and wherein said means for sensing rate of change includes means for producing a deceleration signal, said deceleration signal being coupled to said switching signal input means via said timing circuit means and said pulse generator for actuating said switching circuit for a given period beginning upon the occurrence of said deceleration signal.
Claim 23
Dependent Claim
89 words
The antilocking control system according to claim 16 wherein said pressure control means include a normally closed outlet valve and a normally open inlet valve and further comprising logic circuit means coupled between said comparison means and said inlet valve,between said pulse generator and said inlet valve and between said means for sensing rate of change and said inlet valve for closing said inlet valve selectively upon the occurrence of a deceleration signal, an acceleration signal, an output from said comparison means and pulse intervals of the pulse generator.
Claim 24
Dependent Claim
69 words
The antilocking control system according to claim 17, further comprising additional logic circuit means coupled between said comparison means and said outlet valve and between said means for sensing rate of change and said outlet valve for opening said outlet valve selectively upon the occurrence of an output signal from the comparison circuit in the absence of an acceleration signal and of a deceleration signal after one control cycle.
Claim 25
Dependent Claim
59 words
The antilocking control system according to claim 18 wherein said means for sensing rate of change in velocity produces a second acceleration signal in response to said braked wheel acceleration exceeding a second higher threshold value, and further including means for coupling said second acceleration signal to said inlet valve for opening said inlet valve on a priority basis.
Claim 26
Dependent Claim
61 words
The antilocking system as defined in claim 19 wherein said timing circuit means comprises a capacitive means which is coupled to said pulse generator for providing that said first referece signal is supplied to said comparison means for intervals which increase as said capacitor means discharges in relation to the intervals said second reference signal is supplied to said comparison means.
References Cited (Backward Citations)
US3556610A
Cited
US3582152A
Cited
US3652135A
Cited
US3635530A
Cited
US3637264A
Cited
US3650575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |