US5333943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for anti-lock braking in automobile by measuring brake torque
Assignee: Hitachi Unisia Automotive Ltd
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Filing: 1993-10-14
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Granted: 1994-08-02
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Expires: 2013-10-14
Abstract
Abstract In an anti-lock braking apparatus, by detecting brake torque at a wheel and controlling the braking force of a wheel brake unit, a locked state of the wheel can be quickly detected to thus enable braking control with fast response characteristics. Also, based on direction of a variation of the brake torque on the wheel, the road friction coefficient is predicted to perform feedback control for the braking force and to adjust the brake torque to a target brake torque, whereby the braking performance can be optimized.
Inventors
- 👤 Masuo Kashiwabara
- 👤 Yoshikazu Tanaka
- 👤 Hideki Sekiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:23
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17636; B60T8/32; B60T8/52
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
115 words
An anti-lock braking method for an automotive vehicle for controlling a braking force of a wheel brake unit for restricting slippage of a wheel, comprising the steps of: brake operation detecting for detecting operation of said wheel brake unit; brake torque detecting for detecting a brake torque at said wheel; brake torque transmitting for transmitting said brake torque detected in said brake torque detecting step; brake torque receiving for receiving said brake torque transmitted in said transmitting step; and braking force controlling for controlling said braking force of said wheel brake unit depending upon a condition including said brake torque received in said receiving step, while said operation of said wheel brake unit is detected.
Claim 2
Dependent Claim
115 words
An anti-lock braking method for an automotive vehicle for controlling a braking force of a wheel brake unit for restricting slippage of a wheel, comprising the steps of: brake operation detecting for detecting operation of said wheel brake unit; brake torque detecting for detecting a brake torque at said wheel; brake torque transmitting for transmitting said brake torque detected in said brake torque detecting step; brake torque receiving for receiving said brake torque transmitted in said transmitting step; and braking force controlling for controlling said braking force of said wheel brake unit depending upon a condition including said brake torque received in said receiving step, while said operation of said wheel brake unit is detected.
Claim 3
Dependent Claim
43 words
An anti-lock braking method for an automotive vehicle as set forth in claim 1, wherein a position for detecting said brake torque in said brake torque detecting step is located between a wheel tread area of said wheel and said wheel brake unit.
Claim 4
Dependent Claim
42 words
An anti-lock braking method for an automotive vehicle as set forth in claim 1, wherein a position for detecting said brake torque in said brake torque detecting step is located between said wheel brake unit and a shaft for driving said wheel.
Claim 5
Dependent Claim
78 words
An anti-lock braking method for an automotive vehicle as set forth in claim 1, wherein said braking force controlling step includes controlling for increasing said braking force when said detected brake torque is a negative value having an absolute value greater than a predetermined torque set value T1 set at a negative value by detecting said brake torque in a direction where driving torque for driving said wheel is transmitted from a wheel driving axle to said wheel.
Claim 6
Dependent Claim
73 words
An anti-lock braking method for an automotive vehicle as set forth in claim 1, wherein said braking force controlling step includes controlling for reducing said braking force when said detected brake torque is greater than a torque set value T2 set at a positive value close to 0 by detecting said brake torque in a direction where driving torque for driving said wheel is transmitted from a wheel driving axle to said wheel.
Claim 7
Dependent Claim
82 words
An anti-lock braking method for an automotive vehicle as set forth in claim 1, wherein said braking force controlling step performs braking force controlling with characteristics depending upon a road friction coefficient which is predicted on the basis of said brake torque at said wheel at a time immediately before said brake torque decreases whenever said brake torque at said wheel detected in said brake torque detecting step is decreased while said braking force of said wheel brake unit is not decreased.
Claim 8
Dependent Claim
64 words
An anti-lock braking method for an automotive vehicle as set forth in claim 6, wherein said braking force controlling step sets a target brake torque for said wheel on the basis of said predicted road friction coefficient, and performs feedback control for said braking force on said wheel brake unit to bring said brake torque at said wheel close to said target brake torque.
Claim 9
Dependent Claim
40 words
An anti-lock braking method for an automotive vehicle as set forth in claim 7, wherein said braking force controlling step updates said target brake torque with a value which is gradually increased until a new road friction coefficient is predicted.
Claim 10
Dependent Claim
114 words
An anti-lock braking apparatus for an automotive vehicle for controlling a braking force of a wheel brake unit for restricting slippage of a wheel, comprising: brake operation detecting means for detecting operation of said wheel brake unit; brake torque detecting means for detecting brake torque at said wheel; brake torque transmitter means for transmitting said brake torque detected by the brake torque detecting means; brake torque receiver means for receiving said brake torque transmitted from said transmitter; and braking force controlling means for controlling said braking force of said wheel brake unit depending upon a condition including said brake torque received at said receiver, while said operation of said wheel brake unit is detected.
Claim 11
Dependent Claim
114 words
An anti-lock braking apparatus for an automotive vehicle for controlling a braking force of a wheel brake unit for restricting slippage of a wheel, comprising: brake operation detecting means for detecting operation of said wheel brake unit; brake torque detecting means for detecting brake torque at said wheel; brake torque transmitter means for transmitting said brake torque detected by the brake torque detecting means; brake torque receiver means for receiving said brake torque transmitted from said transmitter; and braking force controlling means for controlling said braking force of said wheel brake unit depending upon a condition including said brake torque received at said receiver, while said operation of said wheel brake unit is detected.
Claim 12
Dependent Claim
43 words
An anti-lock braking apparatus for an automotive vehicle as set forth in claim 9, wherein a position for detecting said brake torque in said brake torque detecting means is located between a wheel tread area of said wheel and said wheel brake unit.
Claim 13
Dependent Claim
42 words
An anti-lock braking apparatus for an automotive vehicle as set forth in claim 9, wherein a position for detecting said brake torque in said brake torque detecting means is located between said wheel brake unit and a shaft for driving said wheel.
Claim 14
Dependent Claim
79 words
An anti-lock braking apparatus for an automotive vehicle as set forth in claim 9, wherein said braking force controlling means includes control means for increasing said braking force when said detected brake torque is a negative value having an absolute value greater than a predetermined torque set value T1 set at a negative value by detecting said brake torque in a direction where driving torque for driving said wheel is transmitted from a wheel driving axle to said wheel.
Claim 15
Dependent Claim
74 words
An anti-lock braking apparatus for an automotive vehicle as set forth in claim 9, wherein said braking force controlling means includes control means for reducing said braking force when said detected brake torque is greater than a torque set value T2 set at a positive value close to 0 by detecting said brake torque in a direction where driving torque for driving said wheel is transmitted from a wheel driving axle to said wheel.
Claim 16
Dependent Claim
82 words
An anti-lock braking apparatus for an automotive vehicle as set forth in claim 9, wherein said braking force controlling means performs braking force control with characteristics depending upon a road friction coefficient which is predicted on the basis of said brake torque at said wheel at a time immediately before said brake torque decreases whenever said brake torque on said wheel detected by said brake torque detecting means is decreased while said braking force of said wheel brake unit is not decreased.
Claim 17
Dependent Claim
64 words
An anti-lock braking apparatus for an automotive vehicle as set forth in claim 14, wherein said braking force controlling means sets a target brake torque at said wheel on the basis of said predicted road friction coefficient, and performs feedback control for said braking force at said wheel brake unit to bring said brake torque on said wheel close to said target brake torque.
Claim 18
Dependent Claim
40 words
An anti-lock braking apparatus for an automotive vehicle as set forth in claim 15, wherein said braking force controlling means updates said target brake torque with a value that is gradually increased until a new road friction coefficient is predicted.
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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) | 1997-08-01 | 1998-01-31 | 1998-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-01 | 2002-01-31 | 2002-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-01 | 2006-01-31 | 2006-08-02 | $7700.00 | Window Closed / Lapsed |