WO2001092075A1 - Verfahren und vorrichtung zur bestimmung des ansprechdrucks von fahrzeugbremsen - Google Patents
Verfahren und vorrichtung zur bestimmung des ansprechdrucks von fahrzeugbremsen Download PDFInfo
- Publication number
- WO2001092075A1 WO2001092075A1 PCT/EP2001/005641 EP0105641W WO0192075A1 WO 2001092075 A1 WO2001092075 A1 WO 2001092075A1 EP 0105641 W EP0105641 W EP 0105641W WO 0192075 A1 WO0192075 A1 WO 0192075A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- signal
- test pressure
- test
- vehicle
- 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
-
- 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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
-
- 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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
Definitions
- the present invention relates to a method for determining the response pressure of vehicle brakes according to the preamble of patent claim 1 and a device according to the preamble of patent claim 8.
- a vehicle brake system in order to generate a braking force, a certain minimum brake pressure must be exceeded, which is referred to as the response pressure.
- a vehicle brake system usually has a plurality of brakes which can have different response pressures, which leads to undesirably high wear on the brakes which respond first.
- the problem of wear is particularly important when a towing vehicle is coupled to different trailers, since the level of response pressure of individual vehicles depends on the individual restoring forces and the mechanical friction between individual brake components.
- the determination of the response pressure can e.g. done on a roller dynamometer, which is relatively cumbersome.
- a method is already known from EP 0 733 532 A2 mentioned at the outset in which the response pressure is determined while driving, by evaluating the vehicle acceleration.
- a possible vehicle deceleration is initially determined from wheel speed signals, which is referred to as the “basic vehicle deceleration” and is caused, for example, by wind resistance, frictional forces or slope.
- a test pressure is then applied to the brake to be checked or the group of brakes to be checked, which is then applied setting test vehicle deceleration determined. If the vehicle deceleration does not change from the basic vehicle deceleration, the test pressure is increased.
- the existing brake pressure is regarded as the response pressure of the brake.
- a certain "minimum test pressure” is required to achieve the detectable change in deceleration, which the driver perceives as a disturbing "jerk”.
- a vehicle deceleration due to a change in engine power cannot be distinguished from a vehicle deceleration due to the test brake pressure.
- DE 196 48 936 A1 describes a method which determines the application pressures of the brakes with a statistical evaluation of measurement data - by means of regression analysis. The measurements take place during service braking, which consequently leads to long identification times.
- the object of the invention is to provide an improved method and an improved device for determining the response pressure of vehicle brakes.
- the invention is based on the idea of applying a test pressure to the brakes to be examined, one before and after the generation of the test pressure Test pressure indicator signal is generated, which is a linear combination of an acceleration signal and a differential speed signal. If the two test pressure indicator signals match within a tolerance band, which is regarded as "failure of the brake", the test pressure is increased and a new test pressure indicator signal is generated. If the two test pressure indicator signals do not match, the existing brake pressure is regarded as the response pressure if the difference between the two test pressure indicator signals exceeds a predetermined limit value.
- the test pressure indicator signal used in the invention includes, in addition to the acceleration signal, a differential speed signal, which can also be referred to as a “slip signal” and which consists of wheel speed signals with the test pressure acted upon or an axle not loaded with test pressure or a wheel and a driven or non-driven vehicle axle is formed.
- a differential speed signal which can also be referred to as a “slip signal” and which consists of wheel speed signals with the test pressure acted upon or an axle not loaded with test pressure or a wheel and a driven or non-driven vehicle axle is formed.
- the response of the brake can be recognized even at lower test pressures.
- Another advantage of using the acceleration signal and the differential speed or slip signal is that a change in deceleration due to the test pressure is distinguishable from a change in deceleration which is due to a change in engine power, e.g. by accelerating or changing down to a lower gear. The change in vehicle deceleration (jerking) caused by the test pressure is also reduced.
- the vehicle deceleration is kept approximately constant by increasing the engine torque, which further improves driving comfort. Furthermore, a "combination" of a device according to the invention with a conventional "cruise control” can be provided so that the vehicle speed is kept constant. In this case too the test pressure indicator signal sufficiently large because its slip component increases due to the increased engine torque.
- Figure 1 is a schematic representation of the method according to the invention.
- Fig. 2 shows a brake system for using driving according to the invention.
- Fig. 1 shows schematically the process flow for determining a brake response pressure.
- the brake response pressure here means the response pressure of an individual wheel brake or the response pressure of a group of brakes, i.e. the response pressure of brakes on an axle or axle group.
- the brake pressure on the brake or brakes to be examined is determined in a step 2.
- the brake pressure p can e.g. can be measured by pressure sensors or can be determined in a known manner by calculating the opening and closing times of brake valves (ABS valves).
- ABS valves brake valves
- step 4 wheel speeds of individual vehicle wheels are measured, e.g. through wheel speed sensors.
- An acceleration signal a is formed from the wheel speed signals by differentiation in step 5.
- step 6 a differential speed signal s is formed from individual wheel speed signals, which will be discussed in more detail.
- a test pressure indicator signal x is formed from the acceleration signal a and the differential speed signal s.
- the test pressure indicator signal x is a linear combination of the acceleration signal a and the differential speed signal s, which e.g. through the equation
- step 8 it is checked whether a first test pressure indicator signal x1 has already been determined. If a test pressure indicator signal x1 has not yet been determined, the test pressure indicator signal x just determined is stored as signal x1 in step 9. A test pressure is then generated in step 10, which acts on the brake to be examined or the group of brakes to be examined.
- steps 2-8 are carried out again, i.e. the brake pressure is determined and stored, and a new test pressure indicator signal x is generated.
- test pressure indicator signal x1 When checking in step 8, it is now determined that a first test pressure indicator signal x1 is already present.
- the test pressure indicator signal x formed after the test pressure generation is thus stored in step 11 as the test pressure indicator signal x2.
- test pressure indicator signals x1, x2 match within a tolerance band. If the test pressure indicator signals x1 and x2 match, it is assumed that the test pressure generated is too low and the brakes to be checked have not yet responded.
- step 12 the previously used test print is released in step 12 and, after a certain pause, a new test print increased by a certain level is issued. Then steps 2-8 are repeated. In step 11 then the newly obtained test pressure indicator signal x2 is stored.
- the acceleration signal can e.g. by differentiating the wheel speed signals from the
- Front wheels i.e. non-driven wheels, the following are determined:
- the differential speed signal can e.g. be defined as a dimensionless quantity that depends on wheel speeds on the non-driven front axle and on the driven rear axle:
- test pressure is applied to the front wheel brakes, that takes away
- Acceleration signal a increases in amount and the differential speed signal s becomes smaller.
- b) Another example is the determination of the response pressure of the brakes of a trailer vehicle. For this purpose, a test pressure is applied to the trailer brakes to be examined, while the other brakes are not pressurized. In this case too, the acceleration signal a and the differential speed signal s can be derived from wheel speed signals of the towing vehicle. The acceleration signal a can be determined as indicated above.
- the differential speed signal can be defined by the following signals measured on the towing vehicle:
- a test pressure is supplied to the brake system of the trailer via the pneumatic coupling head, which leads to a reduction in the acceleration signal a without the differential signal s being disturbed.
- a possible change in the traction force leads to an opposite change in the differential speed signal s and the acceleration signal a.
- a suitable choice of the factor c can prevent these counter effects from appearing in the test pressure indicator signal x.
- wheel speed signals of the trailer can also be evaluated.
- the method for determining the brake response pressure can be supplemented by regulating the engine torque of the towing vehicle.
- a "deceleration pressure" when the test brake pressure is applied it can be provided, similar to a “cruise control", that an engine control increases the engine torque in such a way that the vehicle deceleration does not change or does not change noticeably for the driver.
- the test brake pressure can be built up according to a predetermined time function, for example a ramp function. Since in the test pressure indicator signal x both the vehicle deceleration a and the differential speed signal -s are received, the response of the brake can also be recognized by the change in the differential speed signal s when the vehicle deceleration a is kept constant (eg to zero).
- test brake pressure required to determine the response pressure of the brakes can be built up according to a predetermined time function.
- the Testdruckaufb 'au will not be perceived by the driver as disturbing and at the same fine control of the vehicle deceleration is possible. If the test pressure exceeds a predetermined pressure level, provision can be made for the engine torque to be increased in order to prevent the vehicle from decelerating further.
- the change in the test pressure indicator signal x then only depends on the change in the differential speed signal s.
- FIG. 2 shows a schematic representation of the braking system of a towing vehicle 14 and a trailer vehicle 15.
- the towing vehicle 14 has front wheels 16, 17 and rear wheels 18, 19.
- the trailer vehicle 15 also has front wheels 20, 21 and rear wheels 22, 23.
- a wheel speed sensor 24-31 and a brake cylinder 32-39 are assigned to each of the wheels 16-23.
- An ABS valve 40-43 is connected upstream of the brake cylinders 32-35 of the towing vehicle 14, the brake cylinders 32, 33 of the front axle being supplied with compressed air by a first supply pressure container 44 and the brake cylinders 34, 35 of the rear axle being supplied by a second supply pressure container 45 become.
- the ABS valves 40-43 are connected to a central control unit 47 via electrical lines.
- the wheel speed sensors 24-31 of the towing vehicle 14 and the trailer vehicle 15 are also connected to the control unit 47 via electrical lines (not shown).
- a trailer control valve 48 controlled by the control unit 47 is provided in the towing vehicle 14 and is supplied with reservoir pressure from a reservoir pressure container 49.
- Pneumatic lines 50, 51 lead from the supply pressure container 49 and from the trailer control valve 48 via a pneumatic coupling 52 to a trailer brake valve 53 provided on the trailer vehicle.
- the trailer brake valve 53 is operated by a supply Pressure tank 54 is supplied with pressure medium and acts on the brake cylinders 36, 37 of the front axle or the brake cylinders 38, 39 of the rear axle of the trailer vehicle 15.
- the control unit 47 is also connected via an electrical line 55 to an electronic engine control 56.
- a foot brake valve 57 is provided, via which the driver supplies the control unit 47 with a brake request signal.
- the acceleration signal a and the differential speed signal s are e.g. determined by the following equations:
- control unit 47 determines the response pressure of the brake cylinders 32, 33.
- the response pressure of the other brake cylinders 34-39 can be determined in an analogous manner. LIST OF REFERENCE NUMBERS
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Measuring Fluid Pressure (AREA)
- Braking Systems And Boosters (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT01933983T ATE257441T1 (de) | 2000-05-30 | 2001-05-17 | Verfahren und vorrichtung zur bestimmung des ansprechdrucks von fahrzeugbremsen |
AU2001260312A AU2001260312A1 (en) | 2000-05-30 | 2001-05-17 | Method and device for determining the response pressure of motor vehicle brakes |
DE50101302T DE50101302D1 (de) | 2000-05-30 | 2001-05-17 | Verfahren und vorrichtung zur bestimmung des ansprechdrucks von fahrzeugbremsen |
JP2001588061A JP2003534975A (ja) | 2000-05-30 | 2001-05-17 | 車両ブレーキの応答圧力の決定方法および装置 |
BR0111187-6A BR0111187A (pt) | 2000-05-30 | 2001-05-17 | Processo e dispositivo para determinação da pressão de resposta de freios de veìculos |
EP01933983A EP1289810B1 (de) | 2000-05-30 | 2001-05-17 | Verfahren und vorrichtung zur bestimmung des ansprechdrucks von fahrzeugbremsen |
US10/307,514 US6772625B2 (en) | 2000-05-30 | 2002-12-02 | Method for determining the response pressure of motor vehicle brakes using a test pressure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10026688.6 | 2000-05-30 | ||
DE10026688A DE10026688C1 (de) | 2000-05-30 | 2000-05-30 | Verfahren und Vorrichtung zur Bestimmung des Ansprechdrucks von Fahrzeugbremsen |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/307,514 Continuation US6772625B2 (en) | 2000-05-30 | 2002-12-02 | Method for determining the response pressure of motor vehicle brakes using a test pressure |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001092075A1 true WO2001092075A1 (de) | 2001-12-06 |
Family
ID=7644033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/005641 WO2001092075A1 (de) | 2000-05-30 | 2001-05-17 | Verfahren und vorrichtung zur bestimmung des ansprechdrucks von fahrzeugbremsen |
Country Status (8)
Country | Link |
---|---|
US (1) | US6772625B2 (de) |
EP (1) | EP1289810B1 (de) |
JP (1) | JP2003534975A (de) |
AT (1) | ATE257441T1 (de) |
AU (1) | AU2001260312A1 (de) |
BR (1) | BR0111187A (de) |
DE (2) | DE10026688C1 (de) |
WO (1) | WO2001092075A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018192737A1 (de) | 2017-04-20 | 2018-10-25 | Wabco Gmbh | Verfahren zum einlernen von schaltparametern eines magnetsteuerventils in einem bremssystem eines fahrzeuges sowie bremssystem |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10046036A1 (de) * | 2000-09-18 | 2002-03-28 | Knorr Bremse Systeme | Verfahren zum Abschätzen der Umkippgefahr eines Fahrzeugs |
DE10137148A1 (de) * | 2001-07-30 | 2003-02-13 | Knorr Bremse Systeme | Bremsanlage für Nutzfahrzeuganhänger |
DE10218682A1 (de) * | 2002-04-26 | 2003-11-13 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Ermittlung von charakteristischen Größen |
GB2454223B (en) * | 2007-11-01 | 2011-09-21 | Haldex Brake Products Ltd | Vehicle stability control method |
KR101562378B1 (ko) * | 2008-03-13 | 2015-10-22 | 코닌클리케 필립스 엔.브이. | 차량 안전을 위한 센서 시스템, 차량 제어 시스템 및 운전자 정보 시스템 |
DE102010026411A1 (de) * | 2010-07-07 | 2012-01-12 | Man Truck & Bus Ag | Verfahren und Vorrichtung zur Durchführung einer Bremsenprüfung an Anhänger- und/oder Aufliegerfahrzeugen |
DE102015013761A1 (de) * | 2015-10-23 | 2017-04-27 | Wabco Gmbh | Verfahren zur Ansteuerung von Bremsen |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0733532A2 (de) | 1995-03-24 | 1996-09-25 | WABCO GmbH | Verfahren zur Ermittlung des Ansprechdrucks einer durch Druck betätigten Bremse in einem Fahrzeugbremssystem |
DE19517708A1 (de) * | 1995-05-13 | 1996-11-14 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur elektronischen Steuerung der Bremsanlage eines Fahrzeugs |
DE19521872A1 (de) * | 1995-06-16 | 1996-12-19 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung der Bremsanlage eines Fahrzeugs |
DE19602879C1 (de) | 1996-01-29 | 1997-08-07 | Knorr Bremse Systeme | Verfahren zum Erfassen der Gefahr des Umkippens eines Fahrzeuges |
DE19648936A1 (de) | 1996-11-26 | 1998-05-28 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung der Bremsanlage eines Fahrzeugs |
-
2000
- 2000-05-30 DE DE10026688A patent/DE10026688C1/de not_active Expired - Fee Related
-
2001
- 2001-05-17 JP JP2001588061A patent/JP2003534975A/ja active Pending
- 2001-05-17 DE DE50101302T patent/DE50101302D1/de not_active Expired - Lifetime
- 2001-05-17 AU AU2001260312A patent/AU2001260312A1/en not_active Abandoned
- 2001-05-17 AT AT01933983T patent/ATE257441T1/de not_active IP Right Cessation
- 2001-05-17 EP EP01933983A patent/EP1289810B1/de not_active Expired - Lifetime
- 2001-05-17 WO PCT/EP2001/005641 patent/WO2001092075A1/de active IP Right Grant
- 2001-05-17 BR BR0111187-6A patent/BR0111187A/pt not_active Application Discontinuation
-
2002
- 2002-12-02 US US10/307,514 patent/US6772625B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0733532A2 (de) | 1995-03-24 | 1996-09-25 | WABCO GmbH | Verfahren zur Ermittlung des Ansprechdrucks einer durch Druck betätigten Bremse in einem Fahrzeugbremssystem |
DE19517708A1 (de) * | 1995-05-13 | 1996-11-14 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur elektronischen Steuerung der Bremsanlage eines Fahrzeugs |
DE19521872A1 (de) * | 1995-06-16 | 1996-12-19 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung der Bremsanlage eines Fahrzeugs |
DE19602879C1 (de) | 1996-01-29 | 1997-08-07 | Knorr Bremse Systeme | Verfahren zum Erfassen der Gefahr des Umkippens eines Fahrzeuges |
DE19648936A1 (de) | 1996-11-26 | 1998-05-28 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung der Bremsanlage eines Fahrzeugs |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018192737A1 (de) | 2017-04-20 | 2018-10-25 | Wabco Gmbh | Verfahren zum einlernen von schaltparametern eines magnetsteuerventils in einem bremssystem eines fahrzeuges sowie bremssystem |
DE102017003784A1 (de) | 2017-04-20 | 2018-10-25 | Wabco Gmbh | Verfahren zum Einlernen von Schaltparametern eines Magnetsteuerventils in einem Bremssystem eines Fahrzeuges sowie Bremssystem |
US11198417B2 (en) | 2017-04-20 | 2021-12-14 | Zf Cv Systems Europe Bv | Method for teaching switching parameters of a solenoid control valve in a braking system of a vehicle, and braking system |
Also Published As
Publication number | Publication date |
---|---|
EP1289810A1 (de) | 2003-03-12 |
US6772625B2 (en) | 2004-08-10 |
BR0111187A (pt) | 2003-06-10 |
DE50101302D1 (de) | 2004-02-12 |
EP1289810B1 (de) | 2004-01-07 |
ATE257441T1 (de) | 2004-01-15 |
JP2003534975A (ja) | 2003-11-25 |
DE10026688C1 (de) | 2001-09-13 |
US20030127910A1 (en) | 2003-07-10 |
AU2001260312A1 (en) | 2001-12-11 |
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