DE4340921B4 - Brake pressure control system - Google Patents
Brake pressure control system Download PDFInfo
- Publication number
- DE4340921B4 DE4340921B4 DE19934340921 DE4340921A DE4340921B4 DE 4340921 B4 DE4340921 B4 DE 4340921B4 DE 19934340921 DE19934340921 DE 19934340921 DE 4340921 A DE4340921 A DE 4340921A DE 4340921 B4 DE4340921 B4 DE 4340921B4
- Authority
- DE
- Germany
- Prior art keywords
- brake
- pressure
- estimated
- pressures
- brake circuit
- 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
- 230000004913 activation Effects 0.000 claims abstract description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 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
- B60T8/32—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
- B60T8/4881—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems having priming means
-
- 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
- B60T8/1755—Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve
-
- 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
- B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
-
- 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
- B60T2270/30—ESP control system
- B60T2270/308—ESP control system hydraulic model
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
Bremsdruckregelungssystem,
bei dem aufgrund von Meß-
und Schätzwerten,
wozu die Bremszylinderdrücke
PS gehören,
Sollbremsdrücke
PS für die
Radbremszylinder ermittelt werden, und bei dem aus den Solldrücken PS
mittels eines inversen Hydraulikmodells Ansteuerzeiten UK für eine Einlassventile
aufweisende Hydraulik ermittelt werden, wobei weiterhin der Istdruck aus
dem Bremskreisdruck und den Ansteuerzeiten der den einzelnen Bremsen
zugeordneten Einlass- und Auslassventile mittels eines Hydraulikmodells
abgeschätzt
wird, dadurch gekennzeichnet, dass zur Erzeugung des Bremskreisdrucks
eine Pumpe vorgesehen ist, die bei gefordertem Druckaufbau wirksam
gemacht wird und dann einen konstanten Volumenstrom liefert und
dass der Bremskreisdruck PK für
jeden Bremskreis
– bei
gefordertem Druckaufbau an wenigstens einer der beiden Radbremsen
unter Zuhilfenahme der gemessenen Ventilansteuerzeiten (UK1, UK2)
der zu einem Bremskreis gehörenden
Einlassventile, der geschätzten
Istdrücke (PS1,
PS2) in den zugehörigen
Radbremszylindern, des vom Fahrer gegebenenfalls vorgegebenen gemessenen Bremszylinderdrucks
(Pvor) sowie fahrzeugspezifischer Konstanten
(a1, a2, a3) in rekursiver Weise geschätzt wird...Brake pressure control system in which target brake pressures PS for the wheel brake cylinders are determined on the basis of measured and estimated values, which include the brake cylinder pressures PS, and in which control times UK for an intake valve hydraulic system are determined from the target pressures PS by means of an inverse hydraulic model, the actual pressure also continuing is estimated from the brake circuit pressure and the activation times of the intake and exhaust valves assigned to the individual brakes by means of a hydraulic model, characterized in that a pump is provided for generating the brake circuit pressure, which is activated when the pressure build-up is required and then delivers a constant volume flow and that Brake circuit pressure PK for each brake circuit
- If the pressure build-up is required on at least one of the two wheel brakes with the aid of the measured valve actuation times (UK1, UK2) of the inlet valves belonging to a brake circuit, the estimated actual pressures (PS1, PS2) in the associated wheel brake cylinders, and the measured brake cylinder pressure (P , if applicable) specified by the driver ) and vehicle-specific constants (a 1 , a 2 , a 3 ) are estimated recursively ...
Description
Aus
der
Dort wird aus dem gemessenen Vordruck (= Bremskreisdruck) und den Ventilansteuerzeiten der Bremsdruck im Radbremszylinder abgeschätzt. (Vordruck = Bremskreisdruck)There is calculated from the measured upstream pressure (= brake circuit pressure) and the valve actuation times the brake pressure in the wheel brake cylinder is estimated. (Form = brake circuit pressure)
Die Verwendung einer Pumpe ermöglicht es, höhere als vom Fahrer vorgegebene Bremsdrücke einzusteuern bzw. ohne Bremsbetätigung Druck einzusteuern. Bei der Erfindung muß trotzdem nur der Vordruck als Meßgröße vorliegen. Weitere Sensoren für die Druckmessung werden eingespart. Außerdem wird durch die erfindungsgemäße Schätzung der Bremskreisdrücke eine größere Schätzgenauigkeit als beim Stand der Technik erzielt, da die Rückwirkung der Druckänderungen in den Radbremszylindern auf den Bremskreisdruck durch das verwendete Modell erfaßt wird.The Allows use of a pump it, higher as the brake pressures specified by the driver or without brake Control pressure. In the invention, however, only the form has to be available as a measured variable. More sensors for the pressure measurement is saved. In addition, the estimation of the brake circuit pressures according to the invention greater estimation accuracy than achieved in the prior art because the reaction of the pressure changes in the wheel brake cylinders to the brake circuit pressure due to the model used detected becomes.
Anhand
der Zeichnung wird ein Ausführungsbeispiel
der Erfindung erläutert.
Es zeigen
In
Mittels
der EinlaB- und Auslaßventile
Ein
Block
Ein
weiterer Block
Beispielhaft wird im folgenden für die Hinterachse das Modell zur Berechnung des Kreisdrucks beschrieben. Für die Vorderachse wird das gleiche Modell jedoch mit anderen Parametern verwendet.exemplary is used for the rear axle describes the model for calculating the circular pressure. For the Front axle is the same model but with different parameters used.
Es
werden folgende Größen vereinbart:
ASV2=1:
Einschalten der hinteren Vorladepumpe und der selbstansaugenden
Rückförderpumpe
und das Rücklaufventil
und das Umschaltventil sind bestromt
ASV2=0: Abschalten der
hinteren Vorladepumpe und der selbstansaugenden Rückförderpumpe
und die beiden Ventile sind stromlos
PK2k:
Hinterer Kreisdruck zum Zeitpunkt k
Vp:
Volumenstrom, der von den Pumpen gefördert wird, eine rechnerische
Zwischengröße
V_Hl:
Volumenstrom in den Radbremszylinder hinten links, eine rechnerische
Zwischengröße
V_Hr:
Volumenstrom in den Radbremszylinder hinten rechts, eine rechnerische
Zwischengröße
PO2: Öffnungsdruck
des Druckbegrenzungsventils des Umschaltventils
Pvor: der vom Fahrer vorgegebene, gemessene Hauptbremszylinderdruck
(Vordruck).The following sizes are agreed:
ASV2 = 1: Switching on the rear precharge pump and the self-priming return pump and the return valve and the changeover valve are energized
ASV2 = 0: Switch off the rear precharge pump and the self-priming return pump and the two valves are de-energized
PK2 k : Rear circular pressure at time k
V p : Volume flow that is pumped, a calculated intermediate variable
V_Hl: Volume flow in the wheel brake cylinder at the rear left, an arithmetical intermediate variable
V_Hr: Volume flow in the wheel brake cylinder at the rear right, a calculated intermediate variable
PO2: Opening pressure of the pressure relief valve of the changeover valve
P before : the measured master brake cylinder pressure (pre-pressure) specified by the driver.
Die
Druckänderung
im hinteren Bremskreis wird durch die folgende Gleichung beschrieben:
Die
Volumenströme
in die Radbremszylinder können
wie folgt abgeschätzt
werden.
ki: Konstanten,
sie sind rechnerische Zwischengrößen
UK_Hx
: Ansteuerzeit der EV-Ventile
PM_Hx : gemessene Drücke in den
RadbremszylindernThe volume flows into the wheel brake cylinders can be estimated as follows.
k i : constants, they are arithmetic intermediate values
UK_Hx: activation time of the EV valves
PM_Hx: measured pressures in the wheel brake cylinders
Da
keine gemessenen Radbremszylinderdrücke vorliegen, werden die Schätzdrücke PS_x verwendet
(aus dem Block
Unter
der Annahme, daß der
Volumenstrom der Pumpen konstant ist, erhält man für die Schätzung des Kreisdrucks das in
den Parametern lineare Modell:
Der
geschätzte
Anteil ist dem Vordruck Pvor überlagert,
falls ein solcher Vordruck vorhanden ist (gebremst wird).
mit
Pvor ≤ PK2k+1 ≤ Pvor + PO2
mit a1 =
k1·Vp a1 > 0 z.B. 30.0
a2 = k2·k4 a2 > 0 z.B. 0.0125
a3 = k3·k5 a3 > 0 z.B. 0.0125The estimated rate is superimposed on the upstream pressure P before, if such form is present (is braked).
with P before ≤ PK2 k + 1 ≤ P before + PO2
with a 1 = k 1 · V p a 1 > 0 e.g. 30.0
a 2 = k 2 · k 4 a 2 > 0 e.g. 0.0125
a 3 = k 3 · k 5 a 3 > 0 e.g. 0.0125
Die Gleichung (2) wird nur verwendet wenn ASV2 den Wert 1 hat, d.h. wenn der Kreisdruck aktiv erhöht wird.The Equation (2) is only used if ASV2 has the value 1, i.e. when the circuit pressure is actively increasing becomes.
Wenn
die Pumpen abgeschaltet werden (ASV2 = 0), berechnet sich der Kreisdruck über die folgende
Beziehung:
mit
0 < a4 < 1 z.B. 0.3
a5 < 0 z.B. –0.1
mit
Pk2k > Pvor If the pumps are switched off (ASV2 = 0), the circuit pressure is calculated using the following relationship:
with 0 <a 4 <1 e.g. 0.3
a5 <0 eg –0.1
with Pk2 k> P before
Die Parameter ai können aus Messungen vorab mittels geeigneter Identifikationsverfahren bestimmt werden. In diesen Parametern werden alle Größen wie Abtastzeit, Pumpenleistung, Drossel- bzw. Leitungsquerschnitte usw. zusammengefaßt.The parameters a i can be determined in advance from measurements using suitable identification methods. All parameters such as sampling time, pump output, throttle or line cross sections, etc. are summarized in these parameters.
Die
Gleichungen (2) bzw. (3) können
in ihrer Ordnung erhöht
werden, um Nichtlinearitäten
im unteren Druckbereich besser beschreiben zu können. (z.B. Erweiterung von
Gleichung (2)
Beim Einschalten der Pumpen (ASV2=1) folgt der geschätzte Kreisdruck dem gemessenen. Sobald die Einlaßventile sperren (UK = 0), wird die Kreisdruckänderung nur noch durch das geförderte Volumen der Pumpen bestimmt, was sich im steileren Druckgradienten während des Kreisdruckaufbaus zeigt.At the When the pumps are switched on (ASV2 = 1), the estimated circuit pressure follows the measured one. As soon as the intake valves block (UK = 0), the change in circuit pressure is only affected by the delivered volume of the pumps determines what happens in the steeper pressure gradient during the Circular pressure build-up shows.
Der Druck steigt solange bis das Druckbegrenzungsventil bei einem vorgegebenen Druck öffnet, und dieser somit nicht überschritten werden kann.The Pressure rises until the pressure relief valve at a predetermined Pressure opens, and therefore not exceeded can be.
Wird nun aufgrund der Radregelung ein größerer Druckaufbau in den Radbremszylindern verlangt, fließt entsprechendes Volumen in diese ab, und der Kreisdruck fällt deutlich ab.Becomes now due to the wheel control, a greater pressure build-up in the wheel brake cylinders demands, flows appropriate volume in this, and the circular pressure drops significantly from.
Auch dieses Verhalten wird vom Modell gut beschrieben.Also this behavior is well described by the model.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934340921 DE4340921B4 (en) | 1993-12-01 | 1993-12-01 | Brake pressure control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934340921 DE4340921B4 (en) | 1993-12-01 | 1993-12-01 | Brake pressure control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE4340921A1 DE4340921A1 (en) | 1995-06-08 |
| DE4340921B4 true DE4340921B4 (en) | 2004-11-18 |
Family
ID=6503899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19934340921 Expired - Fee Related DE4340921B4 (en) | 1993-12-01 | 1993-12-01 | Brake pressure control system |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE4340921B4 (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5551770A (en) * | 1994-10-27 | 1996-09-03 | Ford Motor Company | Method for estimating pressure in a pressure actuated controller |
| US5671143A (en) * | 1994-11-25 | 1997-09-23 | Itt Automotive Europe Gmbh | Driving stability controller with coefficient of friction dependent limitation of the reference yaw rate |
| US5735584A (en) * | 1994-11-25 | 1998-04-07 | Itt Automotive Europe Gmbh | Process for driving stability control with control via pressure gradients |
| US5742507A (en) | 1994-11-25 | 1998-04-21 | Itt Automotive Europe Gmbh | Driving stability control circuit with speed-dependent change of the vehicle model |
| DE19515058A1 (en) * | 1994-11-25 | 1996-05-30 | Teves Gmbh Alfred | Yawing moment control appts. for four-wheeled motor vehicle on bend |
| US5694321A (en) | 1994-11-25 | 1997-12-02 | Itt Automotive Europe Gmbh | System for integrated driving stability control |
| US5774821A (en) | 1994-11-25 | 1998-06-30 | Itt Automotive Europe Gmbh | System for driving stability control |
| DE19511694A1 (en) * | 1995-03-30 | 1996-10-02 | Teves Gmbh Alfred | Brake system for motor vehicles |
| DE19521086A1 (en) * | 1995-06-09 | 1996-12-12 | Teves Gmbh Alfred | Method for adjusting a predetermined, variable brake pressure in the wheel brakes of a brake system |
| JP3050092B2 (en) * | 1995-06-30 | 2000-06-05 | 三菱自動車工業株式会社 | Vehicle turning control device |
| DE19525985A1 (en) * | 1995-07-17 | 1997-01-23 | Bayerische Motoren Werke Ag | Brake system for motor vehicles with a brake booster |
| JPH09156487A (en) * | 1995-12-13 | 1997-06-17 | Fuji Heavy Ind Ltd | Braking force control device |
| DE19640107A1 (en) * | 1996-09-28 | 1998-04-09 | Teves Gmbh Alfred | Monitoring device for vehicle brake systems with a brake booster |
| DE19654769A1 (en) * | 1996-12-30 | 1998-07-02 | Teves Gmbh Alfred | Method and device for vehicle control or regulation |
| DE19712889A1 (en) | 1997-03-27 | 1998-10-01 | Bosch Gmbh Robert | Method and device for determining a quantity describing the system pressure in a brake circuit |
| DE19729097B4 (en) * | 1997-07-08 | 2006-07-20 | Robert Bosch Gmbh | Method and device for controlling a brake system |
| DE19737779B4 (en) * | 1997-08-29 | 2013-03-07 | Continental Teves Ag & Co. Ohg | Method and device for determining the brake cylinder pressure |
| DE19814216A1 (en) | 1998-03-31 | 1999-10-07 | Bosch Gmbh Robert | Device and method for controlling at least one driving dynamics variable of a vehicle |
| DE19825113B4 (en) * | 1998-06-05 | 2014-08-07 | Robert Bosch Gmbh | A method and a microprocessor controller for determining a pressure change in a hydraulic system |
| DE19825139A1 (en) | 1998-06-05 | 1999-12-09 | Bosch Gmbh Robert | Method and device for modeling a hydraulic system and braking force control system |
| DE59913909D1 (en) | 1998-12-28 | 2006-11-23 | Bosch Gmbh Robert | METHOD AND DEVICE FOR PRINTING DETERMINATION IN BRAKING SYSTEMS |
| EP1250250A1 (en) * | 2000-01-13 | 2002-10-23 | Continental Teves AG & Co. oHG | Method for increasing the manoeuvrability and driving stability of a vehicle during cornering |
| US6974195B2 (en) | 2000-01-13 | 2005-12-13 | Continental Teves Ag & Co. Ohg | Method for increasing the maneuverability or driving stability of a vehicle during cornering |
| DE102004011518A1 (en) * | 2003-03-12 | 2004-10-14 | Continental Teves Ag & Co. Ohg | Method of regulating vehicle brake control systems with anti-lock braking system and electronic stability program, where during anti-lock braking the hydraulic volume includes that in the low pressure reservoir |
| DE102004011517A1 (en) * | 2003-03-12 | 2004-10-14 | Continental Teves Ag & Co. Ohg | Method of regulating vehicle brake control systems with anti-lock braking system and electronic stability program, where during anti-lock braking the hydraulic volume includes that in the low pressure reservoir |
| DE102012004894A1 (en) * | 2012-03-09 | 2013-09-12 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Braking force generator for brake system of rail vehicle, provides surface contact pressure to brake lining, such that surface contact pressure is modified by auxiliary power source connected to braking force generator or brake lining |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4030724A1 (en) * | 1990-09-28 | 1992-04-02 | Bosch Gmbh Robert | Vehicular antilock control system using inverse hydraulics model |
-
1993
- 1993-12-01 DE DE19934340921 patent/DE4340921B4/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4030724A1 (en) * | 1990-09-28 | 1992-04-02 | Bosch Gmbh Robert | Vehicular antilock control system using inverse hydraulics model |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4340921A1 (en) | 1995-06-08 |
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Legal Events
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|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| 8364 | No opposition during term of opposition | ||
| 8320 | Willingness to grant licenses declared (paragraph 23) | ||
| 8339 | Ceased/non-payment of the annual fee |