US4840436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-lock brake system with traction slip control
Assignee: Continental Teves AG and Co OHG
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Filing: 1987-10-22
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Granted: 1989-06-20
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Expires: 2007-10-22
Abstract
Abstract An anti-lock brake system with traction slip control includes a pedal-actuated, auxiliary-force-assisted braking pressure generator having a master cylinder to which the wheel brakes are connected by main brake lines, auxiliary-pressure hydraulic pumps, wheel sensors and electronic circuits for determining the wheel rotational behavior and for generating electric braking-pressure control signals which, for the purpose of brake slip control, serve to control electromagnetically actuatable pressure-fluid inlet valves and outlet valves provided in the pressure-fluid lines. Pistons of the master cylinder include central control valves which, in the brake's release position, open pressure-fluid connections between the pressure-fluid supply reservior and the pressure chambers and which, in the braking position, close the pressure-fluid connections. The brake lines communicate through supply lines with the pumps. Valves are provided in the pressure-fluid lines connecting the master cylinder to the pressure-fluid supply reservoir and prevent return flow of the pressure fluid out of the pressure chambers of the master cylinder when traction slip control is performed.
Inventors
- 👤 Jochen Burgdorf
- 👤 Hans-Dieter Reinartz
- 👤 Lutz Weise
- 👤 Norbert Ocvirk
- 👤 Horst P. Becker
- 👤 Otto Determann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:50
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/48; B60T8/4809; B60T8/4827; B60T8/44; B60T8/445; Y; Y10; Y10S; Y10S303/00; Y10S303/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
199 words
An anti-lock brake system with traction slip control of the type including a pedal-actuated, auxiliary-force-assisted braking pressure generator having a master cylinder to which two brake circuits each including a pair of wheel brakes are connected by two main brake lines, at least one auxiliary-pressure hydraulic pump, wheel sensor means and electronic circuit means for determining rotational behavior of the wheels and for generating electric braking-pressure control signals which, for the purpose of slip control, control an electromagnetically actuatable pressure-fluid inlet valve and outlet valve provided in the pressure-fluid lines, pistons of the master cylinder being provided with central control valves which, in a brake release position, open pressure-fluid connections between a pressure-fluid supply reservoir and pressure chambers of the master cylinder and which, in a braking position, close said pressure-fluid connections, said at least one hydraulic pump connected to the supply reservoir and to the main brake lines, and comprising at least one valve provided in a pressure-fluid conduit leading from the pressure-fluid supply reservoir to the master cylinder, said at least one valve adapted to shut off pressure-fluid flow in said conduit in the event of traction control, whereby auxiliary pressure develops in said two brake circuits.
Claim 2
Dependent Claim
199 words
An anti-lock brake system with traction slip control of the type including a pedal-actuated, auxiliary-force-assisted braking pressure generator having a master cylinder to which two brake circuits each including a pair of wheel brakes are connected by two main brake lines, at least one auxiliary-pressure hydraulic pump, wheel sensor means and electronic circuit means for determining rotational behavior of the wheels and for generating electric braking-pressure control signals which, for the purpose of slip control, control an electromagnetically actuatable pressure-fluid inlet valve and outlet valve provided in the pressure-fluid lines, pistons of the master cylinder being provided with central control valves which, in a brake release position, open pressure-fluid connections between a pressure-fluid supply reservoir and pressure chambers of the master cylinder and which, in a braking position, close said pressure-fluid connections, said at least one hydraulic pump connected to the supply reservoir and to the main brake lines, and comprising at least one valve provided in a pressure-fluid conduit leading from the pressure-fluid supply reservoir to the master cylinder, said at least one valve adapted to shut off pressure-fluid flow in said conduit in the event of traction control, whereby auxiliary pressure develops in said two brake circuits.
Claim 3
Dependent Claim
39 words
The brake system as claimed in claim 1 wherein each of said two brake circuits includes a separate hydraulic pump and a hydraulic pressure line connecting each pump directly to one of said pressure chambers of the master cylinder.
Claim 4
Dependent Claim
51 words
The brake system as claimed in claim 1 including bypass lines in each main brake line, bypassing each inlet valve, and a non-return valve provided in each bypass line, each said non-return valve adapted to permit return flow of pressure fluid from each wheel brake into the respective main brake line.
Claim 5
Dependent Claim
67 words
The brake system as claimed in claim 1 wherein each central control valve in each piston of the master cylinder includes a valve member longitudinally slidable in a recess in said piston, said valve member cooperating with a tappet such that the tappet moves the valve member into an opened position when the piston is in the release position, said tappet taking support on a stationary stop.
Claim 6
Dependent Claim
58 words
The brake system as claimed in claim 4 wherein each said valve member of each said central control valves is acted upon by a spring in a closing direction, said valve member cooperating with a valve seat arranged in the piston of the master cylinder and having a longitudinal bore in the piston extending from said valve seat.
Claim 7
Dependent Claim
23 words
The brake system as claimed in claim 5 including a transverse pressure-fluid passage in said piston intersecting the longitudinal bore in the piston.
Claim 8
Dependent Claim
30 words
The brake system as claimed in claim 4 wherein said stop member is stationarily supported in a wall of the master cylinder and extends through a recess in the piston.
Claim 9
Dependent Claim
32 words
The brake system as claimed in claim 1 including at least one branch line bypassing at least one valve and at least one non-return valve in said at least one branch line.
Claim 10
Dependent Claim
246 words
An anti-lock brake system with traction slip control of the type including a pedal-actuated, auxiliary-force-assisted braking pressure generator having a master cylinder to which two brake circuits each including a pair of wheel brakes are connected by two main brake lines, at least one auxiliary-pressure hydraulic pump, wheel sensor means and electronic circuit means for determining rotational behavior of the wheels and for generating electric braking-pressure control signals which, for the purpose of slip control, control an electromagnetically actuatable pressure-fluid inlet valve and outlet valve provided in the pressure-fluid lines, pistons of the master cylinder being provided with central control valve which in a brake release position, open pressure-fluid connections between a pressure-fluid supply reservoir and pressure chambers of the master cylinder and which, in a braking position, close said pressure-fluid connections, said at least one hydraulic pump connected to the supply reservoir and to the main brake lines, and comprising at least one valve provided in a pressure-fluid conduit leading from the pressure-fluid supply reservoir to the master cylinder, said at least one valve adapted to shut off pressure-fluid flow in said conduit in the event of traction control, whereby auxiliary pressure develops in said two brake circuits, including a throttling valve in one of the main brake lines which is connected to one of said pressure chambers of the master cylinder which includes a floating piston, said throttling valve adapted to preclude displacement of said floating piston in an actuating direction during traction control.
Claim 11
Dependent Claim
246 words
An anti-lock brake system with traction slip control of the type including a pedal-actuated, auxiliary-force-assisted braking pressure generator having a master cylinder to which two brake circuits each including a pair of wheel brakes are connected by two main brake lines, at least one auxiliary-pressure hydraulic pump, wheel sensor means and electronic circuit means for determining rotational behavior of the wheels and for generating electric braking-pressure control signals which, for the purpose of slip control, control an electromagnetically actuatable pressure-fluid inlet valve and outlet valve provided in the pressure-fluid lines, pistons of the master cylinder being provided with central control valve which in a brake release position, open pressure-fluid connections between a pressure-fluid supply reservoir and pressure chambers of the master cylinder and which, in a braking position, close said pressure-fluid connections, said at least one hydraulic pump connected to the supply reservoir and to the main brake lines, and comprising at least one valve provided in a pressure-fluid conduit leading from the pressure-fluid supply reservoir to the master cylinder, said at least one valve adapted to shut off pressure-fluid flow in said conduit in the event of traction control, whereby auxiliary pressure develops in said two brake circuits, including a throttling valve in one of the main brake lines which is connected to one of said pressure chambers of the master cylinder which includes a floating piston, said throttling valve adapted to preclude displacement of said floating piston in an actuating direction during traction control.
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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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |