EP0844956A2 - Verfahren zur verbesserung des regelverhaltens eines abs - Google Patents
Verfahren zur verbesserung des regelverhaltens eines absInfo
- Publication number
- EP0844956A2 EP0844956A2 EP96924884A EP96924884A EP0844956A2 EP 0844956 A2 EP0844956 A2 EP 0844956A2 EP 96924884 A EP96924884 A EP 96924884A EP 96924884 A EP96924884 A EP 96924884A EP 0844956 A2 EP0844956 A2 EP 0844956A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wheel
- control
- fault
- brake pressure
- abs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 27
- 230000001133 acceleration Effects 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000001960 triggered effect Effects 0.000 abstract description 3
- 230000006399 behavior Effects 0.000 description 5
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000028838 turning behavior Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
- B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
- B60T8/17616—Microprocessor-based systems
Definitions
- the invention relates to a method of the type mentioned in the preamble of claim 1.
- ABS Electronically controlled anti-lock braking systems
- the most important or exclusive input variable for regulating the brake pressure is the turning behavior of the individual vehicle wheels, which is measured with the aid of wheel sensors.
- a vehicle reference speed is formed which, instead of the actual vehicle speed, serves as a reference variable for determining wheel slip and other control variables and thus as a reference variable for brake pressure control during an anti-lock control process.
- ABS anti-lock braking system
- the invention is therefore based on the object of improving the control behavior of an ABS and, in particular, of suppressing the undesired effects of an individual roadway fault.
- the invention is based on the knowledge that certain criteria and information that can be obtained from the wheel turning behavior can be used to infer the existence of a single lane disturbance and that the "individual" disturbance can be counteracted by "additional" pressure build-up.
- a quotient of the maximum brake slip of the wheel and the duration of the pressure reduction is consequent when a blockage protection control process follows partial braking and the occurrence of an acceleration or re-acceleration of the controlled wheel that is above a predetermined limit value this brake slip is formed until the wheel is re-accelerated, and exceeding a predetermined limit value of this quotient is evaluated as detection of an individual fault.
- the brake pressure on the wheel on which the individual fault has occurred is built up with a steeper brake pressure gradient in comparison with a normal control until the acceleration falls below a predefined limit value.
- the method according to the invention is used in particular for front wheel control. A certain minimum deceleration due to the partial braking process is assumed. If the control system has an influence on the yaw moment, this disabled during the "correction" of the individual fault.
- FIG. 1 shows the essential electrical and electronic components of an anti-lock brake system or an anti-lock brake system (ABS). This figure serves to explain the operation of an ABS and the operation of the method according to the invention.
- ABS anti-lock brake system
- each vehicle wheel is equipped with a wheel sensor S1 to S4 which emits a signal which reflects the rotational behavior of the respective wheel.
- Corresponding wheel speed signals Vi to v 4 are obtained in a processing circuit 2, specifically in the form of purely electrical signals or in the form of data if the further processing in the ABS with the aid of program-controlled circuits, such as Processors, microprocessors, microcontrollers and the like. for the explanation of the principle As far as the invention is concerned, this is of no importance.
- the derived signals v, to v 4 , v, to v 4 , and slip signals ⁇ _ to ⁇ 4 are obtained from the wheel speeds v t to v 4 .
- the vehicle speed or a vehicle reference speed v r is required, which is formed by logically linking the prepared wheel speeds v to v 4 with the aid of the logic circuit 4.
- Valve control signals are calculated in an ABS logic circuit 5 from the signals and data ascertained in the circuit 3, if necessary with the addition of further information, which are transmitted via a valve control 6 to a valve block 7, the actuators, such as electromagnetically actuatable hydraulic valves, which modulate the pressure in the individual wheel brakes in the desired manner.
- an additional circuit 8 is present in the exemplary embodiment shown, in which the calculations provided for improving the control behavior of the ABS are carried out.
- partial braking i.e. normal "braking without intervention of the ABS control takes place if the vehicle deceleration for this partial braking is above a predetermined minimum value of, for example, 0.1 to 0.2 g (" g "means the gravitational attraction constant ) and if an anti-lock control process starts in this situation, the quotient calculation becomes important for this particular front wheel, namely if the re-acceleration of the observed wheel is unusually high or above a limit value in the order of 3 g and 6 g lies - in the example according to FIG.
- the brake pressure on this front wheel is included in the subsequent stable phase in comparison to a normal control, a much steeper brake pressure build-up gradient, that is to say built up faster than "normal". This pressure build-up takes place, for example, over a period of 30 to 100 ms.
- FIG. 2 shows in the flow chart the flow of information and decision-making process on which the method according to the invention is based.
- FIG. 3 shows a typical driving situation over a roadway with a road "single fault". Shown over time are the wheel deceleration a, the speed v R of the front wheel, which is detected by the individual fault, the pressure curve p R in the wheel brake of the corresponding wheel and finally symbolically the occurrence of the individual fault over time.
- the course of the Radver is shown in each case
- a front wheel of the vehicle under consideration gets into a pothole or onto a roadway with a single fault.
- the vehicle is in a partial braking situation.
- the speed v R of the front wheel under consideration is greatly reduced.
- a high wheel deceleration a occurs.
- the brake pressure p R in the wheel brake is reduced by the use of the ABS control up to the time t 2 .
- the brake pressure p R in the front wheel brake concerned is rapidly increased again.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19530901 | 1995-08-23 | ||
DE19530901 | 1995-08-23 | ||
DE19536105A DE19536105B4 (de) | 1995-08-23 | 1995-09-28 | Verfahren zur Verbesserung des Regelverhaltens eines ABS |
DE19536105 | 1995-09-28 | ||
PCT/EP1996/002950 WO1997008030A2 (de) | 1995-08-23 | 1996-07-04 | Verfahren zur verbesserung des regelverhaltens eines abs |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0844956A2 true EP0844956A2 (de) | 1998-06-03 |
Family
ID=26017908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96924884A Withdrawn EP0844956A2 (de) | 1995-08-23 | 1996-07-04 | Verfahren zur verbesserung des regelverhaltens eines abs |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0844956A2 (de) |
JP (1) | JPH11511412A (de) |
WO (1) | WO1997008030A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7703179B2 (en) | 2001-11-09 | 2010-04-27 | 3M Innovative Properties Company | Microreplicated surface |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3610186A1 (de) * | 1986-03-26 | 1987-10-01 | Bosch Gmbh Robert | Antiblockierregelsystem |
JP2544911B2 (ja) * | 1986-05-09 | 1996-10-16 | 曙ブレーキ工業株式会社 | アンチスキツド制御方法 |
GB8810861D0 (en) * | 1988-05-07 | 1988-06-08 | Lucas Ind Plc | Vehicle anti-lock braking system |
JPH0367771A (ja) * | 1989-08-08 | 1991-03-22 | Akebono Brake Res & Dev Center Ltd | 車両のアンチロック制御方法 |
-
1996
- 1996-07-04 JP JP9509744A patent/JPH11511412A/ja active Pending
- 1996-07-04 EP EP96924884A patent/EP0844956A2/de not_active Withdrawn
- 1996-07-04 WO PCT/EP1996/002950 patent/WO1997008030A2/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9708030A3 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7703179B2 (en) | 2001-11-09 | 2010-04-27 | 3M Innovative Properties Company | Microreplicated surface |
Also Published As
Publication number | Publication date |
---|---|
WO1997008030A3 (de) | 1997-04-10 |
WO1997008030A2 (de) | 1997-03-06 |
JPH11511412A (ja) | 1999-10-05 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19980323 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CONTINENTAL TEVES AG & CO. OHG |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19990601 |
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GRAG | Despatch of communication of intention to grant |
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GRAH | Despatch of communication of intention to grant a patent |
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GRAH | Despatch of communication of intention to grant a patent |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20000127 |