WO1998002339A1 - Double circuit braking system equipped with a device for recognising a front axle braking system breakdown - Google Patents
Double circuit braking system equipped with a device for recognising a front axle braking system breakdown Download PDFInfo
- Publication number
- WO1998002339A1 WO1998002339A1 PCT/EP1997/003403 EP9703403W WO9802339A1 WO 1998002339 A1 WO1998002339 A1 WO 1998002339A1 EP 9703403 W EP9703403 W EP 9703403W WO 9802339 A1 WO9802339 A1 WO 9802339A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- brake
- front axle
- axle
- wheel
- 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
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/88—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
- B60T8/885—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry
-
- 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
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/403—Brake circuit failure
Definitions
- the present invention relates to a brake system according to the preamble of claim 1.
- brake systems are used, for example, for electronic brake force distribution.
- Electronic brake force distribution lowers the rear axle brake pressure during pedal-operated braking when the brake slip on the rear axle is excessive in order to prevent the rear wheels from locking in front of the front wheels.
- optimal slip is set, but only a reduced brake pressure. This can mean that the possible braking force on the rear axle may not be optimally used.
- With an intact brake system in which the greatest braking torque is applied anyway by the front axle brakes, this is not critical. However, if the front axle brake circuit fails, the optimum vehicle deceleration must be achieved on the rear axle in order to comply with legal standards.
- the present invention has for its object to provide a brake system of the type mentioned, in which the effort to detect a front axle brake circuit failure is reduced.
- the invention can therefore completely dispense with a pressure switch. Instead of monitoring a pressure switch, the brake circuit is now monitored directly on the software side.
- the invention makes use of the fact that when driving straight ahead, the speed of the rear wheels during braking with the front axle brake circuit intact differs only slightly from that of the front wheels. However, if the slip on the rear wheels exceeds a certain value over a long period of time, even though the independent wheel deceleration of the front wheels essentially corresponds to the vehicle deceleration, this is usually because the front wheels are not braked at all. The front axle brake circuit has therefore failed.
- a simple criterion which can be detected solely on the basis of the wheel sensor signals, is represented by the speed differences between the left and right wheels of an axle. If these speed differences on the front and on the rear axle are rectified and they exceed a certain threshold, then there is a cornering .
- Interventions in the wheel turning behavior that do not make the aforementioned plausibility criteria applicable are also carried out in the case of brake slip control.
- an anti-lock braking system in the brake system has the option of taking action to block the rear wheels in good time.
- the brake pressure can be built up immediately. This means that an immediate exit from the electronic brake force distribution can take place. This is based on the consideration that in the event of a vehicle deceleration, which can also be achieved by the rear axle brake circuit alone, with a maximum brake pressure of around 30 bar, provided the front axle brake circuit is not defective. If, however, a sudden pressure build-up on the rear axle is erroneously carried out in such pressure ranges, no vehicle instabilities are to be expected due to the low brake pressure.
- the first situation is as follows: The vehicle is driving straight ahead and is currently being subjected to pedal-operated braking, the slip values not yet being so critical that brake slip control would be necessary. If the independent wheel deceleration of the front wheels moves within a certain range around the vehicle deceleration, the slip sum of the rear wheels is formed. If this slip sum is greater than 1%, for example, i.e. that the rear axle wheels run deeper in the slip than the front axle wheels, a counter is started to record the time of this state.
- the counter is stopped or not started at all if the amount of vehicle deceleration exceeds 0.5 g. Such a vehicle deceleration can usually only be achieved with two intact brake circuits. The counter only continues counting when this vehicle deceleration threshold is again undershot.
- a front axle brake circuit failure is assumed. If an electronic brake force distribution is currently running, it is switched to phase 3. tet, that is, a quick pressure build-up grid is started in order to adapt the rear axle brake pressure to the uncontrolled brake pressure coming from the master cylinder. This switchover to phase 3 is independent of which phase of the electronic brake force distribution is taking place at the time a front axle brake circuit failure is detected.
- the pressure build-up pulse grid is used to give a device for anti-lock control the possibility of timely intervention when the back pressure is high due to the build-up of brake pressure at high admission pressure, i.e. high unregulated brake pressure.
- a cornering can be detected, for example, by determining the difference in the individual wheel speeds between the left and right wheels for the front axle and the rear axle. If both speed differences are rectified and if both speed differences are, for example, greater than a threshold value of 1 km / h, it can be assumed that a curve is being driven through. In such a case, the criteria for driving straight ahead are not applicable due to the influence of geometry and the rolling movement of a vehicle. For example, 1% slip is often present on the inside rear wheel due to the influence of geometry. Wheel vibrations on the inside of the front wheel are also possible due to the relief on the inside of the vehicle.
- the speed differences on the front and rear axles are compared with each other when cornering. If the front axle brake circuit fails, it can be seen on the rear axle that the rear wheel on the inside of the curve runs in higher slip than the other vehicle wheels. This means that the speed difference of the rear axle is significantly larger than that of the front axle. In this case, the criterion for starting a counter for time recording can be determined with the same speed differences ⁇ v h behind and
- the start of the time counter should be linked to the condition that the vehicle is decelerated more than 0.3 g. If the vehicle deceleration exceeds 0.3 g, the fulfillment of the speed difference criterion cannot be interpreted as a front axle brake circuit failure, since such high delays during cornering usually lead to entry into the brake slip control if a brake circuit has failed. So if the brake system is not in a brake slip control, but the vehicle deceleration is large, it can be concluded that the front axle brake circuit is intact.
- a front axle brake circuit failure is also assumed during cornering. If an electronic brake force distribution is currently running, no pressure build-up pulse grid has to be started but the electronic brake force distribution can be left immediately. The pressure in the rear axle brakes is therefore immediately adapted to the unregulated upstream pressure. This increases the comfort in the driver's pedal feel. This measure is not critical, because if the front axle brake circuit failure is detected incorrectly, the small deceleration, which is a prerequisite for the detection, can be achieved with a low brake pressure. This is around 30 bar. If a brake circuit failure is detected incorrectly, an immediate pressure build-up on the rear axle is harmless to the driving behavior, since such low brake pressures are unable to cause the rear wheels to slip excessively.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97930446A EP0910527A1 (en) | 1996-07-12 | 1997-06-30 | Double circuit braking system equipped with a device for recognising a front axle braking system breakdown |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19628217.9 | 1996-07-12 | ||
DE1996128217 DE19628217B4 (en) | 1996-07-12 | 1996-07-12 | Dual-circuit brake system with a device for detecting a front-axle brake circuit failure |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998002339A1 true WO1998002339A1 (en) | 1998-01-22 |
Family
ID=7799709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/003403 WO1998002339A1 (en) | 1996-07-12 | 1997-06-30 | Double circuit braking system equipped with a device for recognising a front axle braking system breakdown |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0910527A1 (en) |
DE (1) | DE19628217B4 (en) |
WO (1) | WO1998002339A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006029349A1 (en) * | 2006-06-27 | 2008-01-03 | Continental Teves Ag & Co. Ohg | Anti-lock brake system regulation improving method for use in electronic brake system of passenger motor vehicle, involves determining loss or defect of brake circuit based on driving dynamics information of additional sensors of vehicle |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19638280B4 (en) * | 1996-09-19 | 2008-04-03 | Robert Bosch Gmbh | Method and device for generating an error signal in a motor vehicle |
US6167354A (en) * | 1998-10-19 | 2000-12-26 | Alliedsignal Truck Brake Systems Company | Method and apparatus for monitoring brake operation in an anti-lock or electronic braking system |
JP3872242B2 (en) | 1999-09-21 | 2007-01-24 | トヨタ自動車株式会社 | Brake control device |
US20060043790A1 (en) * | 2004-08-27 | 2006-03-02 | Spieker Arnold H | Method for detecting brake circuit failure |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2523055A1 (en) * | 1982-03-08 | 1983-09-16 | Honda Motor Co Ltd | ANTI-LOCK BRAKING SYSTEM COMPRISING SEPARATE SAFETY DEVICES FOR FRONT WHEELS AND REAR WHEELS |
DE3813316A1 (en) * | 1987-04-21 | 1988-11-10 | Toyota Motor Co Ltd | Hydraulic dual-circuit antilock brake system |
DE3941409C1 (en) * | 1989-12-15 | 1991-04-18 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | Hydraulic dual circuit brake installation for motor vehicle - has electronic control stage for pressure modulator with drive pressure chamber for automatic braking force distribution approaching ideal |
DE4401995C1 (en) * | 1994-01-25 | 1995-04-06 | Daimler Benz Ag | Brake pressure control device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4224971A1 (en) * | 1992-07-29 | 1994-02-03 | Teves Gmbh Alfred | Method for increasing the functional reliability of a brake system with electronic control of the brake force distribution |
DE4309243C2 (en) * | 1993-03-23 | 2003-07-03 | Continental Teves Ag & Co Ohg | Brake system with electronic control of the brake force distribution |
DE4414980A1 (en) * | 1994-04-29 | 1995-11-02 | Teves Gmbh Alfred | Circuit arrangement for a brake system with EBV |
-
1996
- 1996-07-12 DE DE1996128217 patent/DE19628217B4/en not_active Expired - Fee Related
-
1997
- 1997-06-30 EP EP97930446A patent/EP0910527A1/en not_active Ceased
- 1997-06-30 WO PCT/EP1997/003403 patent/WO1998002339A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2523055A1 (en) * | 1982-03-08 | 1983-09-16 | Honda Motor Co Ltd | ANTI-LOCK BRAKING SYSTEM COMPRISING SEPARATE SAFETY DEVICES FOR FRONT WHEELS AND REAR WHEELS |
DE3813316A1 (en) * | 1987-04-21 | 1988-11-10 | Toyota Motor Co Ltd | Hydraulic dual-circuit antilock brake system |
DE3941409C1 (en) * | 1989-12-15 | 1991-04-18 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | Hydraulic dual circuit brake installation for motor vehicle - has electronic control stage for pressure modulator with drive pressure chamber for automatic braking force distribution approaching ideal |
DE4401995C1 (en) * | 1994-01-25 | 1995-04-06 | Daimler Benz Ag | Brake pressure control device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006029349A1 (en) * | 2006-06-27 | 2008-01-03 | Continental Teves Ag & Co. Ohg | Anti-lock brake system regulation improving method for use in electronic brake system of passenger motor vehicle, involves determining loss or defect of brake circuit based on driving dynamics information of additional sensors of vehicle |
DE102006029349B4 (en) | 2006-06-27 | 2019-10-17 | Continental Teves Ag & Co. Ohg | Method for improving an ABS control |
Also Published As
Publication number | Publication date |
---|---|
DE19628217A1 (en) | 1998-01-15 |
DE19628217B4 (en) | 2005-03-03 |
EP0910527A1 (en) | 1999-04-28 |
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