WO2020249290A1 - Verfahren und vorrichtung zum betreiben eines hydraulischen bremssystems, bremssystem und fahrzeug - Google Patents
Verfahren und vorrichtung zum betreiben eines hydraulischen bremssystems, bremssystem und fahrzeug Download PDFInfo
- Publication number
- WO2020249290A1 WO2020249290A1 PCT/EP2020/061128 EP2020061128W WO2020249290A1 WO 2020249290 A1 WO2020249290 A1 WO 2020249290A1 EP 2020061128 W EP2020061128 W EP 2020061128W WO 2020249290 A1 WO2020249290 A1 WO 2020249290A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- brake
- pressure generating
- generating unit
- switching valve
- master
- 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
- 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
- B60T13/74—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 electrical assistance or drive
- B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
-
- 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
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
-
- 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
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
-
- 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
- B60T2270/402—Back-up
-
- 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
- B60T2270/404—Brake-by-wire or X-by-wire failsafe
-
- 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
- B60T2270/82—Brake-by-Wire, EHB
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2400/00—Special features of vehicle units
- B60Y2400/81—Braking systems
Definitions
- the invention relates to a method for operating a hydraulic motor
- Brake system for a vehicle, in particular a motor vehicle, the brake system having a master brake cylinder that can be operated by a driver and at least one brake circuit connected to the master brake cylinder with at least one hydraulically operated wheel brake, the wheel brake being preceded by at least one controllable inlet valve for setting a braking force of the wheel brake, and with a
- Pressure generating unit which is designed to generate hydraulic pressure in the at least one brake circuit when a brake request occurs, also independently of an actuation of the master brake cylinder, and with an auxiliary pressure generating unit, which is designed to generate the hydraulic pressure in the at least one brake circuit as an alternative, with the pressure generating unit is monitored for malfunctions and when a malfunction is detected, the auxiliary pressure generating unit is activated, and the pressure generating unit is assigned a first switching valve in order to establish or connect to the auxiliary pressure generating unit
- auxiliary pressure generating unit a second controllable switching valve to interrupt or establish a connection to the master cylinder.
- the invention also relates to a device for operating the brake system described above and a correspondingly designed one
- the invention also relates to a vehicle, in particular a motor vehicle, which has such a braking system.
- a vehicle in particular a motor vehicle, which has such a braking system.
- brake systems are also being further developed that can perform a braking process independently of the actuation of the brake pedal.
- the driver has the option of actuating a brake master cylinder, which is connected to at least one brake circuit, by actuating a brake pedal and thereby generating a hydraulic pressure in the brake circuit that acts on one or more wheel brakes.
- a pressure control valve or inlet valve is connected upstream of the wheel brakes in order to set a braking force for each wheel.
- the master cylinder In brake systems that can perform a braking process autonomously, the master cylinder is decoupled or decoupled from the brake circuit, so that when the brake pedal is actuated, a hydraulic pressure set by the master cylinder is not in the brake circuit but in a so-called
- Pedal feeling simulator is pushed.
- the hydraulic pressure in the brake circuit is then driven in particular by an electric motor
- Pressure generating unit generated using one or more pumps. So-called brake-by-wire braking is carried out, in which the brake pedal is hydraulically decoupled from the respective wheel brake. In order to ensure that this function is always available, it is also known to have an auxiliary pressure generating device in the brake system
- Hydraulic pressure generating unit is assigned a first switching valve, through which the hydraulic pressure generating unit with the
- Auxiliary pressure generating unit can be connected, and the auxiliary pressure generating unit a second switching valve through which the auxiliary pressure generating unit and thus also the pressure generating unit can be connected to the master brake cylinder.
- the auxiliary pressure generating unit and the pressure generating unit are thus connected in series in particular. This ensures that if both pressure generating units should fail, the driver can still bring the motor vehicle to a standstill by actuating the brake pedal and hydraulically coupling the master cylinder to the brake circuit. In such a case, the switching valves are then actuated in such a way that the master brake cylinder is hydraulically coupled to the pressure generating units and thus also to the wheel brakes.
- the method according to the invention with the features of claim 1 has the advantage that a delay in the build-up of braking force is reliably avoided when switching from the pressure generating unit to the auxiliary pressure generating unit.
- the method ensures that when the first switching valve is actuated, the connection to the
- Auxiliary pressure generating unit or the master cylinder to produce that from the wheel brakes or the
- Hydraulic medium flowing back from the pressure generating unit does not lead to a pressure drop at the wheel brake.
- the brake system is monitored for the presence of a brake request, which is specified for example by a brake pedal or a control device, and that when a brake request is detected, the second switching valve, through which the auxiliary pressure generating unit with the
- Master cylinder is connected, is controlled to interrupt the connection to the master cylinder. This prevents the hydraulic medium that flows in the direction of the auxiliary pressure generating unit when the first switching valve is opened from flowing into the master brake cylinder and can lead to a pressure loss in the brake circuit. So as soon as one
- the second switching valve is closed to interrupt the connection, and the first is opened to ensure that the hydraulic pressure on the wheel brake can be provided by the auxiliary pressure generating unit.
- the second switching valve is triggered each time a pressure request is detected to interrupt the connection. This ensures that whenever there is a brake request, the brake system is preloaded by closing the second valve in such a way that there is a pressure loss in the
- the second switching valve prefferably activated for the duration of the respective detected braking request in order to interrupt the connection.
- the second switching valve is therefore closed for as long as the braking request is present. This ensures that the hydraulic pressure in the brake system or in the brake circuit does not experience any significant pressure loss for the entire period of the braking process.
- the first switching valve is actuated to establish the connection to the
- Wheel brake is acted upon by the hydraulic pressure provided by the auxiliary pressure generating device.
- the pressure generating unit has a bypass, which is activated when the first valve is opened; alternatively, the hydraulic medium is passed through the pressure generating device.
- a brake pedal assigned to the master brake cylinder and actuated by a driver is monitored for its actuation and / or a control device for an automated output of a brake request is monitored to detect the brake request.
- a brake pedal travel sensor is assigned to the brake pedal, which monitors the brake pedal for its actuation and its actuation state in order to generate a braking request depending on the detected brake pedal travel, which is to be met by the pressure generating unit or, if it fails, by the auxiliary pressure generating unit.
- the Brake request and the pressure request generated, for example, as a function of navigation data and / or data from an environment sensor system of the vehicle.
- the main brake cylinder is preferred in normal operation with a
- Auxiliary pressure generation unit controlled so that, as already mentioned, the driver can indeed press the accelerator pedal and feel a brake counterpressure, but the actual pressure build-up in the brake system takes place via the pressure generation device.
- the device according to the invention with the features of claim 8 is characterized by a control device which is specially designed for this purpose
- the brake system according to the invention with the features of claim 9 is characterized by the device according to the invention.
- the control device is connected to a brake pedal travel sensor and / or a control device of the brake system or is designed as a control device of the brake system, as already mentioned above, in order to detect a braking request and the
- control device is designed to control the pressure generating unit or the auxiliary pressure generating unit accordingly.
- control device is designed to control the pressure generating unit or the auxiliary pressure generating unit accordingly.
- the vehicle according to the invention in particular a motor vehicle, with the
- Figure 1 shows a motor vehicle with an advantageous braking system in a simplified representation
- Figure 2 is a simplified representation of the braking system
- FIG. 3 is a diagram to explain the functioning of the
- FIG. 1 shows a simplified plan view of a motor vehicle 1 with an advantageous brake system 2.
- a drive system of the motor vehicle 1 is not shown for reasons of clarity.
- the brake system 2 has a plurality of wheel brakes 3 which are each assigned to a wheel of the motor vehicle 1 in order to be able to generate a wheel-specific braking force if required.
- the wheel brakes 3 are for this purpose with a
- Pressure distributor 4 connected to the brake system, which distributes a hydraulic pressure provided to the wheel brakes 3. Either everyone is there
- Wheel brake 3 is assigned an inlet valve 5, by means of which the hydraulic pressure made available can be used individually for each wheel, or the pressure distributor 4 has a corresponding one for the respective wheel brake 3
- Inlet valve open.
- the brake system 2 also has a master brake cylinder 6.
- the master cylinder 6 is mechanically with a brake pedal 7, which in the
- the master brake cylinder 6 is designed as a simple brake cylinder or tandem brake cylinder in order to operate one or more brake circuits of the motor vehicle 1.
- the motor vehicle has a brake circuit 8 to which the wheel brakes 3 assigned.
- the master brake cylinder 6 is assigned a switching valve 9, by means of which the master brake cylinder is connected in a first switching position to the brake circuit 8 and in a second position to a pedal feeling simulator 10. If the switching valve 9 is in the second switching position, the hydraulic volume that is made available by the master brake cylinder 6 through the actuation of the brake pedal 7 is in the
- Brake pedal feel simulator 10 is pushed off and does not enter the brake circuit 8, so that the master brake cylinder 6 is hydraulically decoupled from the brake circuit 8.
- the switching valve 9 connects the master brake cylinder 6 to a pressure generating unit 11. This is designed to generate hydraulic pressure in the brake circuit 8 as required. This is the
- Pressure generation unit 11 is connected, for example, to a tank 12 for receiving and providing the hydraulic medium and has one or more hydraulic pumps, not shown in FIG. 1, with, for example, an electric motor, by means of which in the brake system 8 downstream of the pressure generation unit 11 a distributable to the wheel brakes 3
- Hydraulic pressure can be generated.
- the brake circuit 8 has an auxiliary pressure generation unit 13, which is also connected to the tank 12 and is designed to generate a hydraulic pressure in the brake circuit 8 as required, which hydraulic pressure can be distributed to the wheel brakes 3.
- the auxiliary pressure generation unit 13 is in particular the same as the pressure generation unit 11, so that the auxiliary pressure generation unit 13 also has one or more
- Hydraulic pumps which can be driven or driven by an electric motor, in particular.
- the brake system 2 also has a control unit 14, which with the
- Brake pedal travel sensor 15 is connected.
- brake circuit 11 is the brake circuit 11
- Pressure generating unit 11 connected downstream of the auxiliary pressure generating unit 13, a second switching valve 16 being interposed between the pressure generating units 11, 13, which in a first switching position the
- Pressure generating unit 11 connects to the auxiliary pressure generating unit 13 and in a second switching position it disconnects or interrupts the connection.
- the controller 14 is also with the two
- Switching valves 9 and 16 connected to control them.
- the named connections of the control device 14 are not shown in FIG. 1 for reasons of clarity.
- the brake system 2 works as a brake-by-wire brake system, that is to say as a mechanically or hydraulically decoupled brake system.
- the control unit 14 detects a brake pedal position and thus a
- Pressure control valves, or the pressure distributor 4 is distributed to the wheel brakes 3 individually for each wheel in order to carry out an optimal braking process.
- the switching valve 9 is activated in such a way that it connects the brake master cylinder 6 with the pedal travel feeling simulator 10.
- the switching valve 16 is switched in such a way that it interrupts the connection to the auxiliary pressure generating unit 13. This ensures that the hydraulic pressure that is generated by the pressure generating unit 11 is supplied to the wheel brakes 3 alone
- the control device 14 is also designed to monitor the functionality of the pressure generation unit 11. If the control unit 14 detects a braking request, it controls the switching valve 9 so that the connection between the pressure generating unit 13 and the master brake cylinder 6 is interrupted. If the control unit also detects a malfunction of the
- Pressure generating unit 11 or its failure, it controls the switching valve 16 so that the connection of the pressure generating unit 11 to the
- Auxiliary pressure generating unit 13 is produced.
- the brake request generated by the brake pedal actuation 7 is now passed by the control device 14 to the auxiliary pressure generation unit 13, so that it generates the desired hydraulic pressure in the brake system 8. Because the valve 16 is opened and the connection is established, hydraulic medium could flow back from the brake circuit 8 back in the direction of the master brake cylinder 6 or the pedal feel simulator 10 due to the pressure already generated in the brake circuit 8, so that the hydraulic pressure in the
- Brake circuit 8 has to be built up again, which results in a short period of time dT within which the pressure in brake circuit 8 or at wheel brakes 3 can decrease, as shown in FIG.
- FIG. 3 shows, plotted against time t, the hydraulic pressure p prevailing in brake circuit 8 using a characteristic curve K, which shows the pressure profile as a result of a braking request.
- the characteristic curve K shows the
- control unit 14 activates the switching valve 9 to interrupt the connection to the master brake cylinder 6 when the brake request is detected, however, ensures that the hydraulic medium cannot flow back to the master brake cylinder 6 or the tank 12, so that the
- Hydraulic pressure in brake circuit 8 is largely maintained, as shown by the solid line in section dT in FIG.
- control unit 14 thus ensures that a brief reduction in the hydraulic pressure in the brake circuit 8 is avoided when a change is made from the pressure generating unit 11 to the pressure generating unit 13.
- FIG. 2 shows a simplified representation of the brake system 2 according to a further embodiment. Elements already known from FIG. 1 are provided with the same reference numerals, so that in this respect the
- the brake system 2 now has two brake circuits 8 ‘and 8 ′′, which with the
- Pressure generating units 11 and 13 are connected and each a first Switching valve 16 'or 16 "and a second switching valve 9'
- the master cylinder 6 is as
- Tandem cylinder designed, which has two hydraulic pressure chambers, which are each connected to one of the brake circuits 8 ‘or 8 ′′.
- the brake system 2 is divided into a master unit 17 and a slave unit 18.
- the master unit 17 comprises the master brake cylinder 6, the switching valves 16 ′, 16 ′′, the pressure generating unit 11, the pressure distributor 4 and the wheel brakes 3.
- the fact that the pressure generating units 11, 13 are connected in series means that when the pressure generating unit 13 generates the hydraulic pressure, this is supplied by the pressure generating unit 11 through the wheel brakes 3. If the pressure generating unit 11 fails, the
- the switching valve 9 or 9, 9 ′′ is activated or closed by the control unit 14 every time the control unit 14 detects a pressure request or a braking request. This is
- control device 14 monitors on the one hand the brake pedal position of the brake pedal 7 and an optionally available autonomous brake system for the occurrence of a brake request. As soon as such is recognized, the control device 14 controls the switching valve 9 or 9 ', 9 ′′ accordingly to control it to close, to interrupt the connection from the auxiliary pressure generating unit 13 to the master brake cylinder 6.
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/603,089 US20220176932A1 (en) | 2019-06-08 | 2020-04-22 | Method and device for operating a hydraulic braking system, braking system and vehicle |
JP2021571647A JP7297941B2 (ja) | 2019-06-08 | 2020-04-22 | 液圧ブレーキシステムを動作させる方法、及び装置、ブレーキシステム、ならびに車両 |
KR1020227000303A KR20220017483A (ko) | 2019-06-08 | 2020-04-22 | 유압 브레이크 시스템의 작동 방법 및 장치, 브레이크 시스템 및 차량 |
CN202080042009.2A CN113905935A (zh) | 2019-06-08 | 2020-04-22 | 用来运行液压的制动系统的方法和装置、制动系统和车辆 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019208404.4 | 2019-06-08 | ||
DE102019208404.4A DE102019208404A1 (de) | 2019-06-08 | 2019-06-08 | Verfahren und Vorrichtung zum Betreiben eines hydraulischen Bremssystems, Bremssystem und Fahrzeug |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020249290A1 true WO2020249290A1 (de) | 2020-12-17 |
Family
ID=70391131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2020/061128 WO2020249290A1 (de) | 2019-06-08 | 2020-04-22 | Verfahren und vorrichtung zum betreiben eines hydraulischen bremssystems, bremssystem und fahrzeug |
Country Status (6)
Country | Link |
---|---|
US (1) | US20220176932A1 (de) |
JP (1) | JP7297941B2 (de) |
KR (1) | KR20220017483A (de) |
CN (1) | CN113905935A (de) |
DE (1) | DE102019208404A1 (de) |
WO (1) | WO2020249290A1 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013226401A1 (de) * | 2013-12-18 | 2015-06-18 | Robert Bosch Gmbh | Bremssystem |
DE102014211661A1 (de) * | 2014-06-18 | 2015-12-24 | Robert Bosch Gmbh | Bremsvorrichtung mit einem Antiblockiersystem für ein Kraftfahrzeug |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10304144B4 (de) * | 2003-02-03 | 2015-03-12 | Robert Bosch Gmbh | Fahrzeugbremsanlage |
DE102009028770A1 (de) * | 2009-08-21 | 2011-02-24 | Robert Bosch Gmbh | Verfahren zur Betätigung einer hydraulischen Fahrzeugbremsanlage |
DE102010040854A1 (de) * | 2010-09-16 | 2012-03-22 | Robert Bosch Gmbh | Hydraulisches Bremssystem sowie Verfahren zu dessen Betrieb |
JP6432942B2 (ja) | 2015-06-23 | 2018-12-05 | 日立オートモティブシステムズ株式会社 | ブレーキ装置 |
-
2019
- 2019-06-08 DE DE102019208404.4A patent/DE102019208404A1/de active Pending
-
2020
- 2020-04-22 KR KR1020227000303A patent/KR20220017483A/ko unknown
- 2020-04-22 CN CN202080042009.2A patent/CN113905935A/zh active Pending
- 2020-04-22 US US17/603,089 patent/US20220176932A1/en active Pending
- 2020-04-22 WO PCT/EP2020/061128 patent/WO2020249290A1/de active Application Filing
- 2020-04-22 JP JP2021571647A patent/JP7297941B2/ja active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013226401A1 (de) * | 2013-12-18 | 2015-06-18 | Robert Bosch Gmbh | Bremssystem |
DE102014211661A1 (de) * | 2014-06-18 | 2015-12-24 | Robert Bosch Gmbh | Bremsvorrichtung mit einem Antiblockiersystem für ein Kraftfahrzeug |
Also Published As
Publication number | Publication date |
---|---|
JP7297941B2 (ja) | 2023-06-26 |
US20220176932A1 (en) | 2022-06-09 |
CN113905935A (zh) | 2022-01-07 |
DE102019208404A1 (de) | 2020-12-10 |
KR20220017483A (ko) | 2022-02-11 |
JP2022536618A (ja) | 2022-08-18 |
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