US3790225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically actuated vehicle brake system
Assignee: Robert Bosch GmbH
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Filing: 1972-02-09
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Granted: 1974-02-05
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Expires: 1992-02-09
Abstract
Abstract A brake system for a vehicle has devices responsive to electrical signals for causing the wheel brake cylinders to respond. An electrical position generator which is actuated by a driver during braking produces electrical control signals to initiate brake actuation. Each wheel to be braked has an associated hydraulic unit which defines a variable brake fluid volume and is connected to the respective wheel brake cylinder, so that a change in the brake fluid volume of the hydraulic unit influences the brake pressure in the wheel brake cylinder. A separate measuring device is provided for determining the force exerted on the brake of each wheel to be braked and for producing a corresponding electrical output signal. A separate control signal producing device is operatively arranged to respond to both the signal from the position generator and to the output signal from the separate associated measuring device for producing a control signal. A separate brake actuation device is provided for each wheel to be braked, each of the brake actuation devices being responsive to the control signal from a separate one of the control signal producing devices. Each of the brake actuation devices is operatively arranged to change the brake fluid volume defined by an associated one of the hydraulic units.
Inventors
- 👤 H Wehde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:16
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/74; B60T13/745; B60T13/741; B60T8/00; F; F16; F16D; F16D66/00; F16D2066/005; F16D2121/00; F16D2121/18; F16D2121/24; F16D2125/00; F16D2125/02; F16D2125/10; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/40; Y; Y10; Y10S; Y10S303/00; Y10S303/02; Y10S303/03
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
254 words
In a brake system for a vehicle, the system including means responsive to electrical signals for causing brake means which include wheel brake cylinders to respond whenever electrical signals are applied and electrical position generator means actuatable by a driver during braking for producing electrical position signals to initiate brake actuation, the improvement wherein said means for causing the brake means to respond comprises in combination:a separate hydraulic means, including means defining a brake fluid volume, connected with the respective wheel brake cylinder of each wheel to be braked, so that changes in brake fluid volume of each means defining a brake fluid volume serves to influence the brake pressure in the respective one of said wheel brake cylinders; separate measuring means for determining the force exerted on the brake of each wheel to be braked and for producing a corresponding respective electrical output signal for each wheel to be braked; a separate control circuit means for each wheel to be braked, each said control circuit means being responsive to the output signals from a respective one of said measuring means and to the electrical signals from said position generator means for producing a respective control signal for each wheel to be braked; and separate brake acutation means individually responsive to a respective one of said control signals for individually changing the brake fluid volume defined by each of said means defining a brake fluid volume, whereby certain brake pressures at each of the brakes correspond to each position of the position generator means.
Claim 2
Dependent Claim
254 words
In a brake system for a vehicle, the system including means responsive to electrical signals for causing brake means which include wheel brake cylinders to respond whenever electrical signals are applied and electrical position generator means actuatable by a driver during braking for producing electrical position signals to initiate brake actuation, the improvement wherein said means for causing the brake means to respond comprises in combination:a separate hydraulic means, including means defining a brake fluid volume, connected with the respective wheel brake cylinder of each wheel to be braked, so that changes in brake fluid volume of each means defining a brake fluid volume serves to influence the brake pressure in the respective one of said wheel brake cylinders; separate measuring means for determining the force exerted on the brake of each wheel to be braked and for producing a corresponding respective electrical output signal for each wheel to be braked; a separate control circuit means for each wheel to be braked, each said control circuit means being responsive to the output signals from a respective one of said measuring means and to the electrical signals from said position generator means for producing a respective control signal for each wheel to be braked; and separate brake acutation means individually responsive to a respective one of said control signals for individually changing the brake fluid volume defined by each of said means defining a brake fluid volume, whereby certain brake pressures at each of the brakes correspond to each position of the position generator means.
Claim 3
Dependent Claim
51 words
An arrangement as defined in claim 1 wherein each of said hydraulic means comprises a cylinder with a piston on which a respective one of said actuation means acts and through which the brake fluid volume defined by a respective one of said means defining a brake fluid volume is changed.
Claim 4
Dependent Claim
26 words
An arrangement as defined in claim 1 wherein each of said hydraulic means comprises a bellows on which a respective one of said actuation means acts.
Claim 5
Dependent Claim
44 words
An arrangement as defined in claim 3 wherein said bellows comprises a plurality of cells one behind the other with each of said cells being formed of two discs connected together along their peripheries, and with adjacent cells being connected together by an opening.
Claim 6
Dependent Claim
24 words
An arrangement as defined in claim 4 wherein adjacent ones of said cells are sealed together at least in the vicinity of the opening.
Claim 7
Dependent Claim
15 words
An arrangement as defined in claim 4 wherein said discs are formed of fiber-reinforced plastic.
Claim 8
Dependent Claim
30 words
An arrangement as defined in claim 1 wherein each of said measuring means comprises a pressure gauge which measures the pressure in a respective one of said wheel brake cylinders.
Claim 9
Dependent Claim
40 words
An arrangement as defined in claim 1 wherein each of said actuation means includes a motor, each said motor being coupled to a respective one of said means defining a brake fluid volume and effects a change in the volume.
Claim 10
Dependent Claim
30 words
An arrangement as defined in claim 8 wherein each of said acutation means includes motion converting means, including threaded means, for converting the rotation of said motors to axial displacements.
Claim 11
Dependent Claim
52 words
An arrangement as defined in claim 9 wherein said threaded means comprises a mounted threaded member secured against rotation, said threaded member being in engagement with a portion of the rotor of the motor which is provided with threads so that rotation of the rotor effects axial movement of said threaded member.
Claim 12
Dependent Claim
49 words
An arrangement as defined in claim 9 wherein said threaded means comprises a stationary threaded member and a further threaded member which is in engagement with the thread of the stationary threaded member, is coupled to the rotor of the motor, is secured against rotation and is axially movable.
Claim 13
Dependent Claim
87 words
An arrangement as defined in claim 9 wherein said threaded means comprises at least two threaded spindles arranged parallel to one another, said spiNdles being in operative connection with the rotor of the motor in such a manner that during rotation of the motor they are rotated in the same direction of rotation, and a movable member, said threaded spindles being screwed into said movable member in such a manner that during rotation of the motor the movable member is caused to move in an axial direction.
Claim 14
Dependent Claim
16 words
An arrangement as defined in claim 9 wherein each of said motors is a stepping motor.
Claim 15
Dependent Claim
78 words
An arrangement as defined in claim 1 wherein each of said control circuit means includes a bridge circuit, one bridge circuit being provided for each wheel to be braked, the bridge branch resistances being varied at least in part by said position generator means and, on the other hand, by a respective one of said measuring means, the signals occurring in the bridge diagonal when the bridge is out of balance serving to control the associated actuation means.
Claim 16
Dependent Claim
35 words
An arrangement as defined in claim 1 wherein each of said means for causing the brake means to respond is a three-mode controller whereby the brake pressure can be raised, kept approximately constant and lowered.
Claim 17
Dependent Claim
100 words
An arrangement as defined in claim 15 wherein each of said control circuit means comprises voltage comparator means responsive to the electrical signals from said position generator means and the electrical signals from a respective one of said measuring means for producing a voltage difference signal, a threshold switching means responsive to the difference voltage signal for producing a control signal, and means connected between said threshold switching means and a respective one of said brake actuation means for feeding the control signal to the brake actuation means, whereby the brake pressure can be raised, kept approximately constant and lowered.
Claim 18
Dependent Claim
43 words
An arrangement as defined in claim 16 wherein each of said brake actuation means comprises a motor, each motor having a pair of terminals, and means for connecting said terminals together via a resistor whenever the respective motor is in its unfed state.
Claim 19
Dependent Claim
42 words
An arrangement as defined in claim 16 wherein each of said brake actuation means comprises a motor, each motor having a mechanical brake, and means for causing said brake to act on the respective motor whenever it is in its unfed state.
Claim 20
Dependent Claim
30 words
An arrangement as defined in claim 18 further comprising an electromagnet associated with each brake for making the associated brake ineffective whenever the respective motor is in its fed state.
Claim 21
Dependent Claim
50 words
An arrangement as defined in claim 16 further comprising an antilocking system for each wheel to be braked, each antilocking system comprising sensor means and an evaluation circuit responsive to output signals from said sensor means, said evaluation circuit producing signals for controlling a respective one of said actuation means.
Claim 22
Dependent Claim
93 words
An arrangement as defined in claim 16 further comprising an antilocking system for each wheel to be braked, each antilocking system comprising sensor means for sensing wheel slip or wheel deceleration and producing a control signal, and evaluation circuit means responsive to the control signal from said sensor means for producing an output signal, further comprising means responsive to the output signal from said evaluation circuit means for disconnecting said voltage comparator from said threshold switching means and for supplying the output signal from said evaluation circuit means to said threshold switching means.
Claim 23
Dependent Claim
95 words
An arrangement as defined in claim 15 further comprising an antilocking system for each wheel to be braked, each antilocking system comprising sensor means for sensing wheel slip or wheel deceleration and producing a control signal, and evaluation circuit means responsive to the control signal from said sensor means for producing an output signal, and further comprising means responsive to the output signal from said evaluation circuit means for disconnecting said control circuit means from said brake actuation means and for supplying the output signal from said evaluation circuit means to said brake actuation means.
Claim 24
Dependent Claim
67 words
An arrangement as defined in claim 1 further comprising a separate alarm means for each wheel to be braked, each alarm means comprising an actuation device provided for a contact of an electrical warning circuit which actuation device is displaced when the volume of brake fluid for a respective wheel is changed and which actuates the contact when the volume is reduced beyond a given minimum volume.
Claim 25
Dependent Claim
50 words
An arrangement as defined in claim 1 further comprising an antilocking system for each wheel to be braked, each antilocking system comprising sensor means and an evaluation circuit responsive to output signals from said sensor means, said evaluation circuit producing signals for controlling a respective one of said actuation means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |