US5719769A
Expired / Lapsed
US
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Method for determining a trigger threshold value for an automatic braking operation
Assignee: Mercedes Benz Group AG
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Filing: 1995-11-13
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Granted: 1998-02-17
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Expires: 2015-11-13
Abstract
Abstract The invention relates to a method for setting a trigger threshold value for an automatic braking operation. When the actuating speed of the brake pedal exceeds a threshold value, automatic braking operation is initiated, and a brake pressure is increased relative to the brake pressure corresponding to the position of the brake pedal. During each brake actuation a relation is formed between the pedal travel of the brake pedal and the derivative of the vehicle deceleration with respect to the pedal travel. A correcting value is defined from this relationship and the threshold value for automatic braking is determined as a function of a preset threshold value and the correcting value.
Inventors
- 👤 Franz Brugger
- 👤 Bernd Knoff
- 👤 Albrecht Eckl
- 👤 Hans-Georg Riedel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:23
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/321; B60T8/3255; B60T8/3275; B60T13/00; B60T13/10; B60T13/66; B60T13/662; B60T7/00; B60T7/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
Method for triggering a vehicle automatic braking operation in which a brake pressure is increased relative to a brake pressure that corresponds to position of the brake pedal, when the actuating speed of the brake pedal exceeds the trigger threshold value, said method comprising the steps of: measuring pedal travel of a vehicle brake pedal and determining vehicle deceleration during actuation of vehicle brakes; determining a derivative of vehicle deceleration with respect to brake pedal travel, based on measured values of pedal travel and deceleration; determining a vehicle specific correction value as a function of a relationship between said pedal travel and said derivative of vehicle deceleration; determining a triggering threshold value for automatic braking based on a preset threshold and said vehicle specific correction value; and triggering automatic braking whenever actuation speed of said brake pedal exceeds said threshold value.
Claim 2
Dependent Claim
141 words
Method for triggering a vehicle automatic braking operation in which a brake pressure is increased relative to a brake pressure that corresponds to position of the brake pedal, when the actuating speed of the brake pedal exceeds the trigger threshold value, said method comprising the steps of: measuring pedal travel of a vehicle brake pedal and determining vehicle deceleration during actuation of vehicle brakes; determining a derivative of vehicle deceleration with respect to brake pedal travel, based on measured values of pedal travel and deceleration; determining a vehicle specific correction value as a function of a relationship between said pedal travel and said derivative of vehicle deceleration; determining a triggering threshold value for automatic braking based on a preset threshold and said vehicle specific correction value; and triggering automatic braking whenever actuation speed of said brake pedal exceeds said threshold value.
Claim 3
Dependent Claim
22 words
Method according to claim 1, wherein the vehicle deceleration resulting from actuation of the brake is determined from measured wheel rotational speeds.
Claim 4
Dependent Claim
54 words
Method according to claim 2, wherein said step of determining the deceleration resulting from actuation of the brake comprises the further steps of: measuring actual vehicle deceleration based on measured wheel rotational speeds; determining deceleration components attributable forces other than actuation of the vehicle brake; and subtracting said deceleration components from said actual deceleration.
Claim 5
Dependent Claim
22 words
Method according to claim 3, wherein at least vehicle deceleration resulting from air resistance is taken into account in the deceleration components.
Claim 6
Dependent Claim
25 words
Method according to claim 3, wherein at least vehicle deceleration resulting from drag torque of the engine is taken into account in the deceleration components.
Claim 7
Dependent Claim
48 words
Method according to claim 3, further comprising the steps of: comparing said curve of the derivative of vehicle deceleration with a predetermined desired curve; and determining said correcting value as a function of a deviation of said curve of the derivative of vehicle deceleration from said desired curve.
Claim 8
Dependent Claim
16 words
Method according to claim 6, wherein a new correcting value is determined after each braking operation.
Claim 9
Dependent Claim
16 words
Method according to claim 1, wherein a new correcting value is determined after each braking operation.
Claim 10
Dependent Claim
62 words
Method according to claim 1, wherein said step of determining a vehicle specific correction value comprises the further steps of: storing determined values of said derivative of vehicle deceleration in a memory for a plurality of consecutive braking operations; and determining a curve of the derivative of vehicle deceleration as a function of pedal travel based on values stored in said memory.
Claim 11
Dependent Claim
36 words
Method according to claim 1, wherein: the trigger threshold value is determined by multiplying the preset threshold value by the correcting value; and the correcting value is limited to an interval of between 0.8 and 1.5.
References Cited (Backward Citations)
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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) | 2001-02-16 | 2001-08-18 | 2002-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-16 | 2005-08-18 | 2006-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-16 | 2009-08-18 | 2010-02-17 | $7700.00 | Window Closed / Lapsed |