DE10238217B4 - Control of the brake pressure at steep pressure increase gradients - Google Patents
Control of the brake pressure at steep pressure increase gradients Download PDFInfo
- Publication number
- DE10238217B4 DE10238217B4 DE10238217A DE10238217A DE10238217B4 DE 10238217 B4 DE10238217 B4 DE 10238217B4 DE 10238217 A DE10238217 A DE 10238217A DE 10238217 A DE10238217 A DE 10238217A DE 10238217 B4 DE10238217 B4 DE 10238217B4
- Authority
- DE
- Germany
- Prior art keywords
- pressure
- brake
- threshold value
- relief valve
- gradient
- 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.)
- Expired - Fee Related
Links
Images
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
- B60T8/34—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 having a fluid pressure regulator responsive to a speed condition
- B60T8/36—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 having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
- B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
- B60T8/363—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems
- B60T8/365—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems combining a plurality of functions in one unit, e.g. pressure relief
-
- 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
- B60T8/34—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 having a fluid pressure regulator responsive to a speed condition
- B60T8/36—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 having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic 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
- 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
- B60T8/34—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 having a fluid pressure regulator responsive to a speed condition
- B60T8/48—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 having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
- B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
- B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
Verfahren zum Steuern des an einer Radbremse (9) wirkenden Bremsdrucks in einem Bremssystem mit einer Druckerzeugungseinrichtung (4) zum Erzeugen eines Bremsdrucks, einem Einlaßventil (5) zum Einlassen eines Bremsfluids in die Radbremse (9), und einem Druckbegrenzungsventil (3) zum Begrenzen des Bremsdrucks auf einen vorgebbaren Schwellenwert, dadurch gekennzeichnet, daß der am Druckbegrenzungsventil (3) einstellbare Schwellenwert in Abhangigkeit vom Druckaufbaugradienten eingestellt wird.Method for controlling the brake pressure acting on a wheel brake (9) in a brake system with a pressure generating device (4) for generating a brake pressure, an inlet valve (5) for admitting a brake fluid into the wheel brake (9), and a pressure limiting valve (3) for limiting of the brake pressure to a predeterminable threshold value, characterized in that the threshold value which can be set at the pressure limiting valve (3) is set as a function of the pressure build-up gradient.
Description
Die Erfindung betrifft ein Verfahren zum Steuern des an einer Radbremse wirkenden Bremsdrucks gemaß dem Oberbegriff des Patentanspruchs 1 sowie ein Bremssystem gemäß dem Oberbegriff des Patentanspruchs 4.The invention relates to a method for controlling the brake pressure acting on a wheel brake according to the preamble of patent claim 1 and a brake system according to the preamble of patent claim 4.
Beim Anfahren und Beschleunigen eines Fahrzeugs auf glatter Fahrbahn konnen die Antriebsräder schon bei Vorgabe eines geringen Antriebsmoments in starken Schlupf kommen, oder des Fahrzeug bei dynamischer Kurvenfahrt ins Schleudern geraten. Im Rahmen einer ASR- oder ESP-Regelung werden die entsprechenden Rader automatisch gebremst, um die Traktion des Fahrzeugs zu verbessern und die Stabilität des Fahrzeugs zu gewahrleisten. Dabei wird auf Anforderung der ASR- oder ESP der in der Radbremse herrschende Bremsdruck automatisch auf einen vorgegebenen Sollwert eingestellt.When starting and accelerating a vehicle on a slippery road surface, the drive wheels can already come in strong specification when a low drive torque, or get the vehicle in dynamic cornering skidding. As part of an ASR or ESP control, the corresponding wheels are automatically braked to improve the traction of the vehicle and to ensure the stability of the vehicle. At the request of the ASR or ESP, the brake pressure prevailing in the wheel brake is automatically set to a predetermined desired value.
Bei einem Bremsvorgang, bei dem der Fahrer das Bremspedal
Bei einem durch eine Regelung bewirkten Bremseneingriff wird der Bremsdruck von einer Hydraulikpumpe
Ein derartiges Bremssystem zum Durchführen automatischer Bremseingriffe, das mit zwei Bremskreisen und zudem mit Zusatzpumpen zum schnelleren Bremsdruckaufbau ausgestattet ist, ist aus der Druckschrift
Bei niedrigem Druckaufbaugradient folgt der in den Bremsen
Bei schnellem, dynamischem Druckaufbau, d. h. bei steilem Druckaufbaugradient, stellt sich der Bremsdruck in den Radbremsen
Es ist daher die Aufgabe der vorliegenden Erfindung, das Bremsverhalten der Radbremsen bei steilen Druckaufbaugradienten zu verbessern.It is therefore the object of the present invention to improve the braking behavior of the wheel brakes at steep pressure increase gradient.
Gelost wird diese Aufgabe gemaß der Erfindung durch die im Patentanspruch 1 sowie 4 angegebenen Merkmale. Weitere Ausgestaltungen der Erfindung sind Gegenstand von Unteransprüchen.Gelost is this object according to the invention by the features specified in claim 1 and 4 features. Further embodiments of the invention are the subject of dependent claims.
Der wesentliche Gedanke der Erfindung besteht darin, den Schwellenwert eines Druckbegrenzungsventils, mit dem der maximale Druck im Bremskreis eines Bremssystems eingestellt wird, in Abhängigkeit vom Druckaufbaugradienten einzustellen. Dadurch wird das Druckbegrenzungsventil bei kurzfristigen Drucküberhohungen im Bremskreis nicht überströmt und der in der Radbremse wirkende Bremsdruck baut sich schneller auf.The essential idea of the invention is to set the threshold value of a pressure relief valve, with which the maximum pressure in the brake circuit of a brake system is set, as a function of the pressure increase gradient. As a result, the pressure limiting valve is not overflowed with short-term pressure surges in the brake circuit and the brake pressure acting in the wheel brake builds up faster.
Gemäß einer bevorzugten Ausfuhrungsform der Erfindung wird mit zunehmendem Druckaufbaugradienten ein hoherer Schwellenwert am Druckbegrenzungsventil eingestellt. D. h., bei steileren Druckaufbaugradienten wird ein Schwellenwert eingestellt, der vergleichsweise hoher ist als bei gleichem Solldruck und flacheren Druckaufbaugradienten. Die Erhohung des Schwellenwertes kann kontinuierlich oder stufenweise erfolgen.According to a preferred embodiment of the invention, a higher threshold value is set at the pressure limiting valve as the pressure build-up gradient increases. That is, at steeper pressure buildup gradients, a threshold is set that is comparatively higher than at the same target pressure and flatter pressure buildup gradient. The increase of the threshold value can be continuous or stepwise.
Die Erhöhung des Schwellenwertes erfolgt vorzugsweise anhand von Kennlinien oder Tabellen, die im Regelsystem hinterlegt sind.The increase of the threshold value preferably takes place on the basis of characteristic curves or tables which are stored in the control system.
Die Erfindung wird nachstehend anhand der beigefügten Zeichnungen beispielhaft naher erläutert. Es zeigen:The invention will be explained in more detail by way of example with reference to the accompanying drawings. Show it:
Bezuglich der Erlauterung von
Wie erwahnt, kann in Phasen mit hohem dynamischen Druckaufbau im Bremskreis ein Druck entstehen, der hoher ist, als der am Druckbegrenzungsventil
Um ein ungewolltes Uberströmen des Druckbegrenzungsventils
Der Stromverlauf ohne Erhohung des Schwellenwerts ist durch das Bezugszeichen
Die Erhohung des Stellstroms erfolgt nur in Phasen
Die absolute Erhohung des Stellstroms wahrend der Phasen hohen dynamischen Druckanstiegs
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 11
- Bremspedalbrake pedal
- 22
- Hochdruckfestes SchaltventilHigh pressure resistant switching valve
- 33
- DruckbegrenzungsventilPressure relief valve
- 44
- DruckerzeugungsorgenPressurizing worries
- 55
- Einlaßventilintake valve
- 66
- Auslaßventiloutlet valve
- 77
- Leitungencables
- 88th
- RaderBikes
- 99
- Bremsenbrakes
- 1010
- HauptbremszylinderMaster Cylinder
- 1111
- Bereiche mit hohem DruckanstiegAreas with high pressure rise
- 1212
- StromüberhohungenStromüberhohungen
- 1313
- Stromverlauf im quasi stationären FallCurrent flow in quasi stationary case
- 1414
- Absolute StromuberhohungAbsolute power suppression
- 20–2120-21
- Verfahrensschrittesteps
Claims (5)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10238217A DE10238217B4 (en) | 2002-03-26 | 2002-08-21 | Control of the brake pressure at steep pressure increase gradients |
ITMI20030585 ITMI20030585A1 (en) | 2002-03-26 | 2003-03-25 | ADJUSTING THE BRAKING PRESSURE |
US10/400,779 US20040026990A1 (en) | 2002-03-26 | 2003-03-26 | Regulation of the brake pressure in the event of steep pressure buildup gradients |
JP2003084763A JP2003285726A (en) | 2002-03-26 | 2003-03-26 | Method of controlling braking pressure on wheel brake and brake device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10213388.3 | 2002-03-26 | ||
DE10213388 | 2002-03-26 | ||
DE10238217A DE10238217B4 (en) | 2002-03-26 | 2002-08-21 | Control of the brake pressure at steep pressure increase gradients |
Publications (2)
Publication Number | Publication Date |
---|---|
DE10238217A1 DE10238217A1 (en) | 2003-10-16 |
DE10238217B4 true DE10238217B4 (en) | 2012-01-26 |
Family
ID=28050842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10238217A Expired - Fee Related DE10238217B4 (en) | 2002-03-26 | 2002-08-21 | Control of the brake pressure at steep pressure increase gradients |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE10238217B4 (en) |
IT (1) | ITMI20030585A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006024361B4 (en) * | 2006-05-24 | 2021-02-25 | Robert Bosch Gmbh | Method for controlling the brake pressure acting on a wheel brake |
DE102009047335A1 (en) * | 2009-12-01 | 2011-06-09 | Robert Bosch Gmbh | Method for controlling a changeover valve in a hydraulic vehicle brake system |
DE102013007193A1 (en) * | 2013-02-02 | 2014-08-07 | Continental Teves Ag & Co. Ohg | Method for preventing pressure fluctuations in hydraulic vehicle brake system used in motor vehicle, involves deriving over control during pre-control fluid, when pressure oscillation maxima exceed regulating pressure value |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4437701A1 (en) * | 1994-10-21 | 1996-04-25 | Teves Gmbh Alfred | Vehicle hydraulic anti-slip braking system with isolating valve |
DE19644883A1 (en) * | 1996-10-29 | 1998-04-30 | Bosch Gmbh Robert | Vehicle brake system with a traction control and / or driving dynamics control device |
-
2002
- 2002-08-21 DE DE10238217A patent/DE10238217B4/en not_active Expired - Fee Related
-
2003
- 2003-03-25 IT ITMI20030585 patent/ITMI20030585A1/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4437701A1 (en) * | 1994-10-21 | 1996-04-25 | Teves Gmbh Alfred | Vehicle hydraulic anti-slip braking system with isolating valve |
DE19644883A1 (en) * | 1996-10-29 | 1998-04-30 | Bosch Gmbh Robert | Vehicle brake system with a traction control and / or driving dynamics control device |
Also Published As
Publication number | Publication date |
---|---|
DE10238217A1 (en) | 2003-10-16 |
ITMI20030585A1 (en) | 2003-09-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
R016 | Response to examination communication | ||
R018 | Grant decision by examination section/examining division | ||
R020 | Patent grant now final |
Effective date: 20120427 |
|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |