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EP0268440A2
Expired / Lapsed
EP
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Improvements in anti-lock braking systems for vehicles
Assignee: ZF International UK Ltd
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Filing: 1987-11-13
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Granted: —
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Expires: 2007-11-13
Abstract
Abstract A vehicle anti-lock braking system is disclosed in which a supply of fluid from a master cylinder (10) is modulated in accordance with signals from wheel speed sensors (41, 42, 43, 44) to affect brake release and re-application during an anti-lock mode. An electric motor (48) drives a first pump (26, 27) to provide a source of power during the anti-lock mode, and a second pump (45) to charge a hydraulic accumulator (17). The pressure stored in the accumulator (17) may be used to provide assistance when applying the brakes, and may also be used to apply a portion of the braking system.
Inventors
- 👤 Glyn Phillip Reginald Farr
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:53
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4275; B60T8/4283; B60T8/343; B60T8/344; B60T8/40; B60T8/4013
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
A vehicle anti-lock braking system in which a supply of operating fluid from a supply (10) to a vehicle brake (5-8) is modulated in accordance with signals from speed sensing means (41-44) to affect automatic brake release and re-application during an anti-lock control mode, and an hydraulic pump (26, 27, 45) driven by an electric motor (48) provides a source of power during the anti-lock mode, characterised in that the electric motor (48) is adapted to drive both a first pump (26, 27) to replenish brake fluid released from the brake to an expansion chamber during the anti-lock control mode, and a second pump (45) to charge an hydraulic accumulator (17).
Claim 2
Dependent Claim
111 words
A vehicle anti-lock braking system in which a supply of operating fluid from a supply (10) to a vehicle brake (5-8) is modulated in accordance with signals from speed sensing means (41-44) to affect automatic brake release and re-application during an anti-lock control mode, and an hydraulic pump (26, 27, 45) driven by an electric motor (48) provides a source of power during the anti-lock mode, characterised in that the electric motor (48) is adapted to drive both a first pump (26, 27) to replenish brake fluid released from the brake to an expansion chamber during the anti-lock control mode, and a second pump (45) to charge an hydraulic accumulator (17).
Claim 3
Dependent Claim
25 words
A braking system according to claim 1, characterised in that the pressure stored in the accumulator (17) provides assistance (16) when applying the brake (5-8).
Claim 4
Dependent Claim
35 words
A braking system according to claim 1 or claim 2, characterised in that the pressure stored in the accumulator (17) is used to apply a portion (7, 8; 7, 6; 6) of the braking system.
Claim 5
Dependent Claim
48 words
A braking system according to any preceding claim, characterised in that each pump (26, 27, 45) comprises a piston (28, 29, 46) working in a bore (30, 31, 47), and the electric motor (48) is adapted to drive at least two pistons, each working in a respective bore.
Claim 6
Dependent Claim
48 words
A braking system according to claim 4, characterised in that the electric motor (48) is adapted to drive two pistons (28, 46), one piston (28) being adapted to replenish fluid released during the anti-lock control mode, and the other piston (46) being adapted to pressurise the accumulator (17).
Claim 7
Dependent Claim
30 words
A braking system according to claim 5, characterised in that the two pistons (28, 46) are diametrically opposed, and the bores (30, 47) are provided in a common housing (32).
Claim 8
Dependent Claim
30 words
A braking system according to claim 4, characterised in that the electric motor (48) is adapted to drive a pair of opposed pistons (28, 29) and a third piston (46).
Claim 9
Dependent Claim
44 words
A braking system according to claim 7, characterised in that the two opposed pistons (28, 29) each act to replenish fluid from different braking circuits of the system during respective anti-lock modes, and the third piston (46) is adapted to pressurise the accumulator (17).
Claim 10
Dependent Claim
34 words
A braking system according to any preceding claim, in which the source comprises a pedal-operated master cylinder (10), characterised in that the accumulator (17) is utilised to provide assistance to the pedal during braking.
Claim 11
Dependent Claim
29 words
A braking system according to any of claims 1-8, characterised in that the accumulator (17) is used to apply the brakes (7, 8; 6) in an independent braking circuit
References Cited (Backward Citations)
No citation records indexed.
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