EP1077848A1 - Procede permettant de determiner des parametres - Google Patents
Procede permettant de determiner des parametresInfo
- Publication number
- EP1077848A1 EP1077848A1 EP00914144A EP00914144A EP1077848A1 EP 1077848 A1 EP1077848 A1 EP 1077848A1 EP 00914144 A EP00914144 A EP 00914144A EP 00914144 A EP00914144 A EP 00914144A EP 1077848 A1 EP1077848 A1 EP 1077848A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- valve
- resistance
- pressure
- brake
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 230000001419 dependent effect Effects 0.000 claims abstract description 16
- 238000011156 evaluation Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 description 11
- 239000010949 copper Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 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
- 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
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
-
- 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
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
-
- 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
- B60T8/36—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
- B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units
- B60T8/368—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units combined with other mechanical components, e.g. pump units, master cylinders
-
- 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
- B60T8/404—Control of the pump unit
-
- 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
-
- 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
- B60T8/90—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 a simulated speed signal to test speed responsive control 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
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/10—ABS control systems
- B60T2270/14—ABS control systems hydraulic model
Definitions
- the invention relates to a method for determining parameters for the viscosity and / or temperature of a brake fluid of a vehicle.
- the viscosity of a brake fluid or hydraulic fluid is highly temperature-dependent.
- the high viscosity at low fluid temperature namely at low temperature, for example below -10 degrees C, in the starting phase of a motor vehicle, impairs the controllability of the brake pressure of a regulated hydraulic brake system.
- the object of the present invention is therefore to ensure the function of a hydraulic vehicle brake system with all its sub-functions, such as anti-lock function, traction slip function and driving stability function, with little effort, even at very low outside temperatures.
- a vehicle is a motor vehicle with four wheels, which is equipped with a hydraulic brake system.
- the driver can build up brake pressure in the hydraulic brake system using a pedal-operated master cylinder.
- Each wheel has a brake, which is assigned at least one inlet valve and one outlet valve.
- the wheel brakes are connected to the master cylinder via the inlet valves, while the outlet valves lead to an unpressurized container or low-pressure accumulator.
- an auxiliary pressure source usually a motor-pump unit, which can also build up pressure in the wheel brakes regardless of the position of the brake pedal.
- the inlet and outlet valves and the further valves arranged in the brake circuit can be actuated electromagnetically for controlling the pressure in the wheel brakes by actuating valve coils.
- actuating valve coils For the detection of dynamic driving conditions
- An electronic control system which usually forms a structural unit together with a hydraulic block that receives the valves and pump, and on one side of which the pump motor is arranged, regulates the driving dynamics of the vehicle during unstable driving.
- the function of the driving stability control therefore consists in giving the vehicle the vehicle behavior desired by the driver within the physical limits in critical (unstable) situations.
- ESP electronic stability program
- a yaw moment control ensures stable driving conditions when driving through a curved track.
- Different vehicle reference models can be used for yaw moment control, for example the single-track model.
- yaw rate difference is determined by means of a so-called yaw moment controller - or more precisely - a yaw moment Control law, converted into a yaw moment, which forms the input variable of a distribution logic.
- the distribution logic itself determines the brake pressure to be applied to the individual wheel brakes.
- the control of the intake and exhaust valves takes place via a pressure control, which converts pressure variables into valve switching signals depending on the real pressure build-up and pressure reduction characteristics in the wheel brakes, which are modeled in the pressure model.
- the pressure model receives the input variables required for this and, based on it and in accordance with system parameters, simulates the pressure prevailing in the brake.
- the pressure model can receive the control signals that influence the brake pressure on the brake under consideration, that is to say, for example, signals for the intake valves, the exhaust valves, for the hydraulic pump or the like. From these signals and from system parameters (e.g. line cross-sections, switching characteristics, etc.), the pressure model can simulate the pressure in the wheel brakes parallel to the build-up of the wheel pressure, so that the control loop can be closed by outputting the pressure determined in this way using the pressure model.
- system parameters e.g. line cross-sections, switching characteristics, etc.
- the design according to the invention therefore proposes a method for determining parameters for the viscosity and / or temperature of a brake fluid of a vehicle, which brake valves, which can be actuated via controllable coils, are fed to the wheel brakes, the parameters being determined via the temperature-dependent change in resistance of at least one coil.
- the temperature-dependent change in resistance of the valve coil can vary according to the relationships
- R 3 R 20 [l + ⁇ (5 - 20 ° C)]
- the parameters for the viscosity or temperature of the valve coil arranged in the controller are then determined in the evaluation unit.
- the evaluation unit can be designed as a microprocessor and can be part of the print model.
- the pump delivery capacity stored in the pressure model can be determined in the evaluation unit as a function of the temperature profile determined via the change in resistance of the valve coil or of a temperature threshold value, including correction factors.
- the temperature value is determined when the vehicle starts or immediately after the vehicle starts.
- this start temperature value is corrected as a function of the controller current consumption, in particular the valve current consumption, and the heating or cooling of the hydraulic block through which the brake fluid flows.
- This constant temperature difference value 3 ⁇ _ 0 f tset of a controller / hydraulic block unit is used to correct the 9 valve value determined by the change in resistance of the valve coil.
- the correction of the temperature $ can be followed by means of a correction factor k, which represents the course of the temperature difference between the measuring location (the controller), the temperature and the hydraulic block
- the temperature value 3 brake can be determined in the evaluation unit, including correction values or correction values that are stored, calculated or estimated in tables, characteristic curves or models and reflect the valve current consumption .
- the temperature value is a function of the hydraulic block through which the brake fluid flows according to the relationship
- the temperature values determined in this way reflect the temperature of the brake fluid with sufficient accuracy.
- Using a correction factor ki temperature deviations between the temperature of the hydraulic block and the brake fluid can be taken into account.
- the pressure build-up and / or pressure reduction characteristics of the pressure model are modified as a function of the parameters, in particular the temperature values.
- This modification via the parameters provided to the brake pressure model is carried out by means of a temperature-dependent determination of the pump delivery rate or variables derived therefrom.
- the pump delivery rate is modified by a predetermined amount when the temperature falls below a predetermined temperature, in particular when the temperature falls below -10 ° C., in particular increased or continuously modified depending on the temperature value.
- valve switching signals are calculated, via which the brake valves on the wheels are controlled and the pressure in the individual wheel brakes is individually regulated.
- Fig. 1 shows an inventive motor-pump unit with valves actuated by valve coils
- FIG. 2 shows the circuit according to the invention for temperature-dependent resistance measurement on the coil according to FIG. 1.
- Fig. 3 shows a valve block temperature model
- Fig. 4 shows the dependence of the pump delivery rate on the temperature of the brake fluid
- Fig. 1 shows a pressure control device which consists essentially of a hydraulic or valve block 24 or valve receiving body and a cover or housing 29. From this hydraulic block 24, the individual valve domes or valve housings 25, in which the valve parts (not shown) which are movable by magnetic force, protrude in a known manner.
- a valve block for an ABS with wheel-specific control generally contains 8
- a valve block for an ESP with wheel-specific control generally contains 12 such valves, namely four inlet and four outlet valves as well as two separating valves and two changeover valves.
- the valve actuation force is generated by a magnetic field, which acts from a valve coil 26 through the valve housing 25 on valve bodies (not shown) arranged inside the valve housing 25.
- valve coils 26 are arranged and held elastically in the cover or housing 29 such that they are in place when they are put on of the housing 29 come to rest on the valve block 24 on the associated valve housings 25 and on the base 30 of the valve receiving body 24. With the aid of flexible connecting wires 31, the valve coils 26 are connected to a power board 32 and a printed circuit board 33 carrying the control electronics.
- the individual valve coils 26 consist of a winding (not shown), in particular a copper winding, and a steel jacket which influences the course of the magnetic field lines.
- An element 21 connects the electronic control system 22 (the regulator), in which the electronic stability program (ESP) is stored, with the pump motor 23 arranged opposite the regulator on the hydraulic block 24.
- the connecting element 21 is designed as an electrically pluggable supply element which holds the pump motor 23 and / or the valves of the brake system are supplied with the electrical energy made available by the electronic control system. Motor-pump units are known and therefore do not need to be described in more detail.
- the connecting element 21 is, for example, cylindrical and has a plug-in contact element 27 for electrically conductive fastening, which is inserted into a terminal assigned to the pump motor.
- the connecting element 21 is arranged within an opening 28 of the hydraulic block 24 and contacts the through-hole 28 of the hydraulic block 24 via elastic elements 34 provided on the circumference.
- a device for controlling the valve coils is shown schematically, which essentially consists of a microprocessor 40 or corresponding signal processing unit or evaluation unit with an analog / digital converter 41, which NEN voltage regulator 42 is connected to the power supply 43 of the vehicle.
- the input 55 of the A / D converter 41 is connected to the supplier 43 via a parallel connection.
- the supply voltage digitized in the A / D converter is fed to the microprocessor as a reference voltage via input 55.
- the supplier 43 is connected to the coil 26 via a supply line 44.
- the coil 26 is the valve coil mentioned in FIG. 1.
- Two electronic switches 46, 47 semiconductor switches
- valve coil If the valve coil is supplied with current due to a control process via the switches 46, 47, a voltage dependent on the current drops at the coil 26.
- the differential input voltage of the valve coil is tapped and the output voltage signal, which is dependent on the temperature-dependent resistance value of the coil 26, is fed to the A / D converter of the microprocessor.
- the supply voltage supplied via input 55 is correlated with the output signal of the operational amplifier 50 and a temperature 3 VeMi , which is dependent on the temperature-dependent change in resistance of the valve coil 26 , is formed.
- the temperature-dependent change in resistance of the valve coil can vary according to the relationships
- the parameters for the viscosity or temperature of the controller are arranged in the microprocessor 40
- the microprocessor can be part of the pressure model.
- the pump delivery rate stored in the pressure model can be modified in the microprocessor depending on the temperature curve determined by the change in resistance of the valve coil or on a temperature threshold value including correction factors.
- Figure 4 shows the relationship the pump delivery capacity, which is influenced by the temperature of the brake fluid and thus the viscosity. If the temperature of the brake fluid falls below -10 ° C, the performance of the pump decreases almost proportionally to the temperature.
- the temperature value is determined when the vehicle starts or immediately after the vehicle starts.
- This start temperature value is subsequently corrected as a function of the controller current consumption, in particular the valve current consumption, and the heating or cooling of the hydraulic block through which the brake fluid flows.
- This constant temperature difference value 3 ⁇ __ 0 ffset of a controller / hydraulic block unit is used to correct the temperature value 3 Vm ⁇ determined by the change in resistance of the valve coil .
- the correction of the temperature, 9 valve can be done by means of a correction factor k, the course the temperature difference between the measuring point (the controller), the temperature and the hydraulic block, in the microprocessor.
- the temperature value 3 brake can be determined in the microprocessor, including correction values or correction values which are stored, calculated or estimated in tables, characteristic curves or models and reflect the valve current consumption .
- the temperature value is a function of the hydraulic block through which the brake fluid flows according to the relationship
- the pump delivery rate stored in the pressure model is corrected and the pressure build-up and pressure reduction curves are modified, by means of which the actual wheel pressures are simulated.
- the valves of the brake system are activated for a longer time when the brake pressure builds up, for example, when the brake fluid has a higher viscosity, especially below a temperature of -10 ° C or -15 ° C.
- the actual wheel pressure thus reaches the brake pressure requested by the driving dynamics control earlier in time.
- a timer ensures that a cooling down period is available between the end of the old driving cycle and the resumption of a new driving cycle, within which the valve coil reaches ambient temperature.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Regulating Braking Force (AREA)
Abstract
L'invention concerne un procédé permettant de déterminer des paramètres relatifs à la viscosité ou à la température du liquide de frein d'un véhicule. Le liquide de frein est cédé aux freins de roues par des valves de freins qui sont actionnées par des bobines pouvant être commandées. Pour garantir une dynamique de réglage élevée même à basses températures, les paramètres peuvent être déterminés par la variation de résistance, en fonction de la température, d'au moins une bobine.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19911788 | 1999-03-17 | ||
DE19911788 | 1999-03-17 | ||
DE10012041A DE10012041B4 (de) | 1999-03-17 | 2000-03-14 | Verfahren zum Bestimmen von Kenngrößen |
DE10012041 | 2000-03-14 | ||
PCT/EP2000/002353 WO2000055022A1 (fr) | 1999-03-17 | 2000-03-16 | Procede permettant de determiner des parametres |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1077848A1 true EP1077848A1 (fr) | 2001-02-28 |
Family
ID=26004809
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00914144A Withdrawn EP1077848A1 (fr) | 1999-03-17 | 2000-03-16 | Procede permettant de determiner des parametres |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1077848A1 (fr) |
WO (1) | WO2000055022A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19923689A1 (de) * | 1999-05-22 | 2000-11-23 | Bosch Gmbh Robert | Elektrohydraulisches Bremssystem und Verfahren zu seiner Steuerung |
EP1363818B1 (fr) * | 2001-02-21 | 2007-03-14 | Continental Teves AG & Co. oHG | Procede de commande d'un dispositif de freinage dans un vehicule automobile et dispositif de freinage |
DE202009002581U1 (de) * | 2009-02-24 | 2010-07-15 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg | Kraftfahrzeugsitz |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3709189A1 (de) * | 1987-03-20 | 1988-09-29 | Teves Gmbh Alfred | Hydraulische bremsanlage mit blockierschutz- und/oder antriebsschlupfregelung |
DE4344440A1 (de) * | 1993-12-24 | 1995-06-29 | Teves Gmbh Alfred | Elektromagnetventil, insbesondere für schlupfgeregelte Kraftfahrzeugbremsanlagen |
DE19534227A1 (de) * | 1995-09-15 | 1997-04-10 | Teves Gmbh Alfred | Elektromagnetventil, insbesondere für schlupfgeregelte Kraftfahrzeugbremsanlagen |
DE19642192A1 (de) * | 1996-10-12 | 1998-04-16 | Teves Gmbh Alfred | Verfahren und Bremsensystem zur Verbesserung des Regelverhaltens bei tiefen Außentemperaturen |
US5971503A (en) * | 1998-02-03 | 1999-10-26 | Ford Global Technologies, Inc. | Hydraulic control unit with ambient temperature compensation during fluid pressure delivery |
-
2000
- 2000-03-16 EP EP00914144A patent/EP1077848A1/fr not_active Withdrawn
- 2000-03-16 WO PCT/EP2000/002353 patent/WO2000055022A1/fr not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0055022A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000055022A1 (fr) | 2000-09-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1478557B1 (fr) | Procede pour regler une pression de freinage donnee variable | |
WO1994007717A1 (fr) | Procede et circuit pour reguler le debit d'une pompe hydraulique | |
WO2009065709A1 (fr) | Unité de commande de frein | |
DE4312404A1 (de) | Fremdkraftbremssystem für Kraftfahrzeuge | |
EP1296865B1 (fr) | Procede et systeme asservi de commande d'un systeme de freinage a regulation electronique | |
EP2238001B1 (fr) | Procédé de conditionnement d'une soupape de régulation | |
DE19858815A1 (de) | Verfahren und Bremsanlage zur Regelung der Fahrstabilität eines Kraftfahrzeuges | |
EP0827469A1 (fr) | Procede et dispositif permettant de commander le systeme de freinage d'un vehicule | |
DE102012222489A1 (de) | Verfahren zur Regelung der Fahrdynamik | |
EP1163134A1 (fr) | Procede permettant de determiner des parametres | |
WO2000018625A1 (fr) | Procede et systeme de commande et/ou de reglage de sequences de fonctionnement d'un vehicule automobile | |
WO2000055023A1 (fr) | Procede permettant de determiner des parametres | |
EP0985586B1 (fr) | Système d'antiblocage pour un système de freinage électromécanique de véhicule basé sur un régulateur de logique floue | |
DE10012041B4 (de) | Verfahren zum Bestimmen von Kenngrößen | |
WO2000055022A1 (fr) | Procede permettant de determiner des parametres | |
EP2170667B1 (fr) | Procédé pour mesurer la pression d'alimentation au niveau d'une soupape hydraulique analoguée, à commande électromagnétique | |
DE102007018515B4 (de) | Vorrichtung zur Bremsdruckregelung mit Blockierschutzfunktion und weiteren Regelungen | |
US6588263B2 (en) | Arrangement and method for determining the temperature of valves | |
DE102019209396A1 (de) | Verfahren zur Überprüfung der Funktionstüchtigkeit eines hydraulischen Bremssystems | |
DE102014215297A1 (de) | Regelschaltung zur Regelung sowie Schaltungsanordnung zur Steuerung einer Bremsanlage für Kraftfahrzeuge | |
DE102005015101B4 (de) | Verfahren zur Bestimmung der Anschaltzeit eines Magnetventils in einem hydraulischen System | |
DE102015010293A1 (de) | Verfahren zum temperaturabhängigen Ansteuern eines Drucksteuerventils sowie Steuereinrichtung hierzu | |
DE102007015265B4 (de) | Verfahren zur Ermittlung der Öffnungsstrom-Charakteristik von analog angesteuerten Ventilen | |
WO2004020261A1 (fr) | Procede et dispositif de freinage de deux roues d'un vehicule | |
DE102006003389A1 (de) | Verfahren und Vorrichtung zum Regeln einer Radbremse |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
17P | Request for examination filed |
Effective date: 20010321 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Effective date: 20021210 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR IT |