WO1997008030A2 - Method of improving the control characteristics of an antilocking system (abs) - Google Patents
Method of improving the control characteristics of an antilocking system (abs) Download PDFInfo
- Publication number
- WO1997008030A2 WO1997008030A2 PCT/EP1996/002950 EP9602950W WO9708030A2 WO 1997008030 A2 WO1997008030 A2 WO 1997008030A2 EP 9602950 W EP9602950 W EP 9602950W WO 9708030 A2 WO9708030 A2 WO 9708030A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wheel
- control
- fault
- brake pressure
- abs
- Prior art date
Links
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
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/011,824 US6041277A (en) | 1996-07-04 | 1996-04-07 | Method of improving the control characteristics of an antilocking system (ABS) |
EP96924884A EP0844956A2 (en) | 1995-08-23 | 1996-07-04 | Method of improving the control characteristics of an antilocking system (abs) |
JP9509744A JPH11511412A (en) | 1995-08-23 | 1996-07-04 | Method for improving control operation of an ABS system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19530901 | 1995-08-23 | ||
DE19536105.9 | 1995-09-28 | ||
DE19536105A DE19536105B4 (en) | 1995-08-23 | 1995-09-28 | Method for improving the control behavior of an ABS |
DE19530901.4 | 1995-09-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997008030A2 true WO1997008030A2 (en) | 1997-03-06 |
WO1997008030A3 WO1997008030A3 (en) | 1997-04-10 |
Family
ID=26017908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1996/002950 WO1997008030A2 (en) | 1995-08-23 | 1996-07-04 | Method of improving the control characteristics of an antilocking system (abs) |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0844956A2 (en) |
JP (1) | JPH11511412A (en) |
WO (1) | WO1997008030A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7703179B2 (en) | 2001-11-09 | 2010-04-27 | 3M Innovative Properties Company | Microreplicated surface |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3610186A1 (en) * | 1986-03-26 | 1987-10-01 | Bosch Gmbh Robert | ANTI-BLOCKING CONTROL SYSTEM |
DE3715103A1 (en) * | 1986-05-09 | 1987-11-12 | Akebono Brake Ind | ANTI-BLOCKING CONTROL SYSTEM FOR MOTOR VEHICLES |
EP0341866A2 (en) * | 1988-05-07 | 1989-11-15 | LUCAS INDUSTRIES public limited company | Vehicle anti-lock braking system |
DE4025045A1 (en) * | 1989-08-08 | 1991-02-14 | Akebono Brake Ind | ANTI-BLOCKING CONTROL SYSTEM FOR MOTOR VEHICLES |
-
1996
- 1996-07-04 JP JP9509744A patent/JPH11511412A/en active Pending
- 1996-07-04 EP EP96924884A patent/EP0844956A2/en not_active Withdrawn
- 1996-07-04 WO PCT/EP1996/002950 patent/WO1997008030A2/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3610186A1 (en) * | 1986-03-26 | 1987-10-01 | Bosch Gmbh Robert | ANTI-BLOCKING CONTROL SYSTEM |
DE3715103A1 (en) * | 1986-05-09 | 1987-11-12 | Akebono Brake Ind | ANTI-BLOCKING CONTROL SYSTEM FOR MOTOR VEHICLES |
EP0341866A2 (en) * | 1988-05-07 | 1989-11-15 | LUCAS INDUSTRIES public limited company | Vehicle anti-lock braking system |
DE4025045A1 (en) * | 1989-08-08 | 1991-02-14 | Akebono Brake Ind | ANTI-BLOCKING CONTROL SYSTEM FOR MOTOR VEHICLES |
Also Published As
Publication number | Publication date |
---|---|
WO1997008030A3 (en) | 1997-04-10 |
EP0844956A2 (en) | 1998-06-03 |
JPH11511412A (en) | 1999-10-05 |
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