WO2022262911A1 - Vermeidung der hydraulischen rückfallebene - Google Patents
Vermeidung der hydraulischen rückfallebene Download PDFInfo
- Publication number
- WO2022262911A1 WO2022262911A1 PCT/DE2022/200108 DE2022200108W WO2022262911A1 WO 2022262911 A1 WO2022262911 A1 WO 2022262911A1 DE 2022200108 W DE2022200108 W DE 2022200108W WO 2022262911 A1 WO2022262911 A1 WO 2022262911A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- mode
- linear actuator
- hydraulic
- brake
- Prior art date
Links
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000007704 transition Effects 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
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- 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
- 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
- B60T13/12—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 the fluid being liquid
- B60T13/16—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 the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
- B60T13/20—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 the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs with control of pump driving 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
- 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
- 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
- B60T13/74—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
- B60T17/18—Safety devices; Monitoring
-
- 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
-
- 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
- B60T17/226—Devices for monitoring or checking brake systems; Signal devices using devices being responsive to the difference between the fluid pressions in conduits of multiple braking 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
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
- B60T7/122—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger for locking of reverse movement
-
- 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
- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
- B60T8/4081—Systems with stroke simulating devices for driver input
-
- 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
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/06—Hill holder; Start aid systems on inclined road
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/403—Brake circuit failure
-
- 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
- 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 controlling a hydraulic brake system of a motor vehicle, having a linear actuator as a driver-independent pressure supply device, and a hydraulic valve arrangement between the linear actuator and wheel brakes of the hydraulic brake system.
- a motor of the linear actuator has mechanical and, in particular, thermal limits that stand in the way of continuous loading. If an overload is detected and the availability is limited as a result, the linear actuator must therefore be degraded, up to and including complete shutdown, in order to prevent irreversible damage.
- the braking system is switched to a hydraulic fallback level, in which the driver has to apply braking force solely using muscle power.
- the object is achieved by a method for controlling a hydraulic brake system of a motor vehicle, having a linear actuator as a driver-independent pressure supply device, and a hydraulic valve arrangement between the linear actuator and wheel brakes of the hydraulic brake system, with reduced availability of the linear actuator being carried out in a holding mode in which the hydraulic Pressure in the wheel brakes is locked in by means of the valve arrangement and a performance of the linear actuator is reduced, in particular to zero.
- the system pressure profile ie the hydraulic pressure in an area that is connected to the wheel brakes and therefore indicates information about the braking force, is in hold mode measured and carried out a transition from the hold mode to a backup mode based on the system pressure curve.
- the linear actuator indicates reduced availability, for example a thermal overload
- the vehicle is stationary and a detected driver braking request corresponds to a pressure requirement greater than 5 to 10 bar.
- a termination condition for the holding mode it can be provided that the vehicle is rolling, ie has a speed greater than zero, the driver's request drops by a predetermined absolute or percentage amount, or the driver presses the brake pedal with more than 500N.
- transition to replacement mode avoids the brake system having to be downgraded directly to a full hydraulic fallback life.
- the threshold value can be selected as a percentage of the original value at the start of the hold mode.
- the system pressure curve can also be analyzed in another way, for example it can be checked how quickly the system pressure drops.
- the threshold value is established based on the gradient of the roadway. Only smaller deviations from the original value are allowed on a steep slope than on the flat. For example, two threshold values can be provided. If the vehicle inclination is less than an inclination limit a and the system pressure measured during the holding mode drops by a first percentage threshold value, then the standstill protection is transferred to the backup mode. If, on the other hand, the vehicle inclination is greater than or equal to the inclination limit a, the standstill protection is already transferred to the backup mode when the measured System pressure decreases during hold mode by a second percentage threshold that is less than the first threshold.
- the reduced availability of the linear actuator is recognized when a temperature assigned to the linear actuator exceeds a threshold value.
- the temperature can be determined on the linear actuator using a temperature sensor or calculated from variables such as the electrical resistance of motor coils. Alternatively or additionally, the temperature can be determined using temperature models. The temperature models assume a starting temperature of components. This starting temperature can be determined, for example, by a sensed ambient temperature. Then the electrical energy input of the motor, i.e. the level and duration of the current supply, is added. This energy input is added to the starting temperature of the components and thus the new actual temperature is determined.
- a post-pumping mode is carried out, in which the locked-in pressure is increased by the linear actuator and subsequently switched back to the hold mode.
- the post-pumping mode can be carried out as soon as the system pressure falls below a second threshold value which is above the first threshold value.
- the linear actuator must enable at least brief re-pumping.
- a second temperature threshold value can be provided for this purpose, for example. The repumping can greatly increase the total time for which a brake pressure can be maintained, since the linear actuator is only actuated electrically for a short time to build up pressure and can cool down again while the pressure is being maintained.
- the holding mode is carried out when the motor vehicle is at a standstill. are at a standstill the safety requirements are lower, so that maintaining a pressure is sufficient for the operation of the braking system.
- the replacement mode is not the hydraulic fallback level in which the driver alone can exert a braking force.
- the replacement mode is a parking brake mode in which an electromechanical parking brake of the motor vehicle is applied and the hydraulic brake system is deactivated, as a result of which the vehicle is held by the parking brake.
- the electrohydraulic valves can also be switched to a currentless state by allowing them to cool down.
- the hydraulic braking system can also be only partially switched off as required.
- the backup mode is a cooperative mode, in which an additional hydraulic pressure supply device is controlled to increase the locked-in pressure and subsequently switched back to the hold mode.
- the linear actuator can thus be relieved through the use of the additional pressure supply device.
- the backup mode is a half mode in which the valve arrangement is actuated to openly connect the wheel brakes of a first axle to a master brake cylinder which can be actuated by the driver and to lock in the hydraulic pressure of the wheel brakes of a second axle.
- the two circuits are thus separated by a circuit separating valve.
- the pressure of the wheel brakes is adjusted to the pressure of the master brake cylinder before the valve arrangement establishes a flow-open connection.
- These can, for example, briefly exhaust valves are opened. This prevents pressure pulses from being transmitted to the brake pedal and thus to the driver.
- a linear actuator builds up a pressure which is greater than the required pressure and locks in the greater pressure. It is therefore already calculated with a certain drop in pressure over time, which can be determined, for example, via known leakage values of the individual valves. Due to the excessive original value at the beginning of the holding mode, the threshold value can be selected as a lower percentage and a minimum pressure for holding the vehicle at a standstill can be maintained for longer.
- a hydraulic brake system for a motor vehicle having a linear actuator as a driver-independent pressure supply device, a hydraulic valve arrangement between the linear actuator and wheel brakes of the hydraulic brake system, and a control device which is set up to carry out the above method.
- Fig. 1 shows schematically a brake system according to the invention of a first embodiment
- Fig. 2 shows schematically a brake system according to the invention of a second embodiment
- Fig. 3 shows a timing of handover to hold mode
- the braking system shown in Fig. 1 for a motor vehicle includes four hydraulically actuated wheel brakes 8a-8d.
- the brake system comprises a master brake cylinder 2 that can be actuated by means of an actuating or brake pedal 1, a travel simulator or a simulation device 3 that interacts with the master brake cylinder 2, a pressure medium reservoir 4 that is at atmospheric pressure, an electrically controllable pressure supply device 5, and a valve arrangement comprising wheel-specific brake pressure modulation valves, which for example, are designed as inlet valves 6a-6d and outlet valves 7a-7d.
- the brake system includes at least one electronic control and regulation unit 12 for controlling the electrically actuable components of the brake system.
- the wheel brake 8a is assigned to the left front wheel (FL), the wheel brake 8b to the right front wheel (FR), the wheel brake 8c to the left rear wheel (RL) and the wheel brake 8d to the right rear wheel (RR).
- the master brake cylinder 2 has a master brake cylinder piston 15 in a housing 16, which delimits a hydraulic pressure chamber 17, and represents a single-circuit master brake cylinder 2.
- the pressure chamber 17 accommodates a return spring 9, which positions the piston 15 in an initial position when the master brake cylinder 2 is not actuated.
- the pressure chamber 17 is connected to the pressure medium reservoir 4 via radial bores formed in the piston 15 and a corresponding pressure compensation line 41 , which can be shut off by a relative movement of the piston 15 in the housing 16 .
- the pressure chamber 17 is on the other hand connected by means of a hydraulic line section (also referred to as the first supply line) 22 to a brake supply line 13 to which the input ports of the inlet valves 6a-6d are connected.
- the pressure chamber 17 of the master brake cylinder 2 is connected to all inlet valves 6a-6d.
- no hydraulic valve in particular no electrically or hydraulically actuated valve and no check valve, is arranged.
- a diagnostic valve in particular one that is normally open, can be contained in the pressure compensation line 41 or between the master brake cylinder 2 and the pressure medium reservoir 4, preferably a parallel connection of a normally open diagnostic valve with a check valve that closes toward the pressure medium reservoir 4.
- the valve arrangement can also include other hydraulic valves.
- a separating valve 23 is arranged between the supply line 22 connected to the pressure chamber 17 and the brake supply line 13 or the pressure chamber 17 is connected to the brake supply line 13 via the first supply line 22 with a separating valve 23 .
- the isolating valve 23 is designed as an electrically actuable, preferably normally open (SO), 2/2-way valve. The hydraulic connection between the pressure chamber 17 and the brake supply line 13 can be shut off by the isolating valve 23 .
- a piston rod 24 couples the pivoting movement of the brake pedal 1 as a result of a pedal actuation with the translational movement of the master brake cylinder piston 15, the actuation path of which is detected by a displacement sensor 25, which is preferably designed redundantly.
- the corresponding piston travel signal is a measure of the brake pedal actuation angle.
- a pressure sensor 20 connected to the first supply line 22 detects the pressure built up in the pressure chamber 17 by a displacement of the piston 15 . This pressure value can also be evaluated to characterize or determine the driver's braking request. As an alternative to a pressure sensor 20, a force sensor 20 can also be used to determine the driver's braking request.
- the simulation device 3 is designed hydraulically and is hydraulically coupled to the master brake cylinder 2 .
- the simulation device 3 essentially has, for example, a simulator chamber 29, a simulator rear chamber 30 and a simulator piston 31 separating the two chambers 29, 30 from one another.
- the simulator piston 31 is supported on a housing by an elastic element 33 (eg simulator spring) arranged in the (for example dry) simulator rear chamber 30 .
- the hydraulic simulator chamber 29 is connected to the pressure chamber 17 of the master brake cylinder 2 by means of a simulator release valve 32 that can preferably be actuated electrically and is preferably closed when de-energized.
- the braking system or the braking system comprises an inlet valve 6a-6d and an outlet valve 7a-7d for each hydraulically actuated wheel brake 8a-8d, which are hydraulically interconnected in pairs via central connections and connected to the wheel brake 8a-8d.
- the inlet valves 6a-6d are each connected in parallel with a non-return valve, which opens towards the brake supply line 13.
- the outlet connections of the outlet valves 7a-7d are connected to the pressure medium reservoir 4 via a common return line 14.
- the electrically controllable pressure supply device 5 is designed as a hydraulic cylinder-piston arrangement (or a single-circuit, electrohydraulic actuator) or linear actuator, the piston 36 of which can be actuated by a schematically indicated electric motor 35 with the interposition of a rotation-translation gear 39, also shown schematically.
- the piston 36 delimits the single pressure chamber 37 of the pressure supply device 5.
- a rotor position sensor, indicated only schematically, which serves to detect the rotor position of the electric motor 35 is denoted by the reference number 44.
- a line section (also referred to as the second supply line) 38 is connected to the pressure chamber 37 of the electrically controllable pressure supply device 5 .
- the supply line 38 is connected to the brake supply line 13 via an electrically actuable, preferably normally closed, sequence valve 26 as part of the valve arrangement.
- the hydraulic connection between the pressure chamber 37 of the electrically controllable pressure supply device 5 and the brake supply line 13 (and thus the input connections of the inlet valves 6a-6d) can be opened and shut off in a controlled manner by the switching valve 26 .
- the actuator pressure generated by the force of the piston 36 on the pressure medium enclosed in the pressure chamber 37 is fed into the second supply line 38 .
- the supply line 38 is connected to the brake supply line 13 via the switching valve 26 . In this way, during normal braking, wheel brake pressure is built up and reduced for all wheel brakes 8a-8d by moving the piston 36 forwards and backwards.
- wheel brake pressures can be adjusted individually for each wheel simply by means of the inlet and outlet valves 6a-6d, 7a-7d. With a corresponding reduction in pressure, the proportion of pressure medium released via the outlet valves 7a-7d flows via the return line 14 into the pressure medium reservoir 4.
- Pressure medium can be sucked back into the pressure chamber 37 by moving the piston 36 back when the sequence valve 26 is closed, in that pressure medium can flow from the container 4 via the line 42 with a check valve 53 opening in the direction of flow to the actuator 5 into the actuator pressure chamber or pressure chamber 37 .
- pressure chamber 37 is also in one unactuated state of the piston 36 via one or more snifting holes with the pressure medium reservoir 4. This connection between the pressure chamber 37 and the pressure medium reservoir 4 is separated when the piston 36 is actuated (sufficiently) in the direction of actuation 27 .
- an electrically actuable, normally open circuit separating valve 40 is arranged, through which the brake system is divided into two hydraulic sub-circuits.
- Brake supply line 13 is divided into a first line section 13a, which is connected to master brake cylinder 2 (via separating valve 23), and a second line section 13b in the second hydraulic sub-circuit, which is connected to pressure supply device 5 (via switching valve 26).
- the first line section 13a is connected to the inlet valves 6a, 6b of the wheel brakes 8a, 8b and the second line section 13b is connected to the inlet valves 6c, 6d of the wheel brakes 8c, 8d.
- the brake system When the circuit separating valve 40 is open, the brake system is designed as a single circuit. By closing the circuit separating valve 40, the brake system can be separated or divided into two hydraulic sub-circuits, brake circuits I and II, in particular controlled according to the situation.
- the master brake cylinder 2 via the separating valve 23
- the pressure supply device 5 (with the connection valve 26 open) is only connected to the inlet valves 6a, 6b connected to the wheel brakes 8c and 8d of the rear axle HA.
- the input connections of all inlet valves 6a-6d can be supplied with a pressure by means of the brake supply line 13 which, in a first operating mode (e.g. “brake-by-wire” operating mode), corresponds to the brake pressure generated by the Pressure supply device 5 is provided.
- the brake supply line 13 can be acted upon by the pressure of the pressure chamber 17 of the master brake cylinder 2 in a second operating mode (eg in a de-energized fallback operating mode).
- the brake system advantageously includes a level measuring device 50 for determining a pressure medium level/level in the pressure medium reservoir 4.
- the hydraulic components namely the master brake cylinder 2, the simulation device 3, the pressure supply device 5, the valve arrangement with the hydraulic valves 6a-6d, 7a-7d, 23, 26, 40 and 32 and the hydraulic connections including the brake supply line 13 together located in a hydraulic control unit 60 (HCU).
- the electronic control and regulation unit (ECU) 12 is assigned to the hydraulic control and regulation unit 60 .
- Hydraulic and electronic control and regulation units 60, 12 are preferably designed as one unit (HECU).
- the brake system includes a pressure sensor 19 or system pressure sensor for detecting the pressure provided by the pressure supply device 5 .
- the pressure sensor 19 is arranged behind the sequence valve 26 as viewed from the pressure chamber 37 of the pressure supply device 5 .
- the two rear wheel brakes 8c, 8d are each equipped with an integrated parking brake 48c, 48d, which are designed as electromechanical parking brakes.
- FIG. 2 now shows a further embodiment of a brake system.
- the connection to the front wheel brakes 8a, 8b is routed through a further brake unit 54, each with a switching valve 59a, 59b, which is open during normal operation.
- the further brake unit comprises a further pressurization device 57, which is designed as two hydraulic pumps 57a, 57b with a common motor.
- the hydraulic pumps 57a, 57b are connected on the suction side via a normally closed pump isolating valve 58a, 58b to an associated low-pressure accumulator 55a, 55b, which in turn has a connection to the brake fluid reservoir 4.
- the low-pressure accumulators 55a, 55b are also connected to the associated wheel brakes 8a, 8b via a further valve 56a, 56b.
- the hydraulic pump 57 and the linear actuator 5 can be controlled by two separate control units.
- FIG 3 shows a corresponding sequence with the system pressure 70 and the valve current 60 of the sequence valve 26.
- the valve current 60 of the sequence valve 26 is briefly increased to the opening current 61, as a result of which the sequence valve 26 opens. Thereafter, the valve current 60 is reduced to a holding current 62, which keeps the sequence valve 26 open. While the sequence valve 26 is open, a hydraulic pressure is built up by the linear actuator 5 and the system pressure 70 increases accordingly.
- the switching valve 26 is now closed, as a result of which the hydraulic pressure in the wheel brakes 8a to 8d is locked.
- the valve current 60 of the sequence valve 26 is reduced from the holding current 62 to a closing current 63 .
- the electrical current of the linear actuator 5 can be switched off accordingly, so that the linear actuator can cool down.
- the trapped hydraulic pressure does not remain unchanged at the initial level because all the hydraulic units, in particular the hydraulic valves of the valve arrangement have a certain leakage flow.
- the system pressure 70 is therefore monitored. At a point in time 71, the system pressure 70 falls below a threshold value 73, which is set at 90% of the original value 74 when the transition to hold mode takes place. According to the invention, a switch is made to a backup mode.
- a switch is made to a parking brake mode as a backup mode.
- the electromechanical parking brakes 48c, 48d are applied, as a result of which the vehicle is held at a standstill.
- the hydraulic brake system can therefore be switched off or at least switched over in such a way that all components can cool down in order to be fully operational again at a later point in time.
- a cooperative mode is switched to as a backup mode.
- the brake system of FIG. 2 which has a further pressure supply device 57 in addition to the linear actuator 5.
- the electric pumps 57a and 57b are controlled to increase the brake pressure in the wheel brakes 8a and 8b. Once a target pressure is reached, the pressure can be locked in again.
- the cooperative mode can also be combined with the parking brake mode by simultaneously activating the electromechanical parking brakes 48c, 48d on the rear axle.
- the half mode is switched to as a backup mode.
- a circuit separating valve 40 is closed in order to separate the brake system into two partial circuits.
- the wheel brakes 8c and 8d of the rear axle then remain in a state in which the hydraulic pressure is locked.
- the wheel pressure of the wheel brakes 8a and 8b is adjusted to the hydraulic pressure in the master brake cylinder 2 by briefly opening the outlet valves.
- the separating valve 23 is opened, as a result of which the master brake cylinder 2 is connected to the wheel brakes 8a, 8b in an open-flow manner. The driver thus gains direct control over the front brakes.
- the driver can depress the brake pedal to increase the braking force.
- the use of the replacement modes according to the invention thus prevents the brake system from having to switch directly to a hydraulic fallback level, in which only the driver has to build up the required brake pressure via the auxiliary brake cylinder.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Regulating Braking Force (AREA)
- Braking Systems And Boosters (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023574207A JP2024520611A (ja) | 2021-06-17 | 2022-06-02 | 油圧フォールバックレベルの回避 |
CN202280035652.1A CN117320933A (zh) | 2021-06-17 | 2022-06-02 | 避免液压后备级 |
KR1020237038401A KR20230167110A (ko) | 2021-06-17 | 2022-06-02 | 유압 폴백 레벨 방지 |
US18/571,422 US20240278758A1 (en) | 2021-06-17 | 2022-06-02 | Method of avoiding the hydraulic fallback level in a brake system of a motor vehicle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021206232.6A DE102021206232A1 (de) | 2021-06-17 | 2021-06-17 | Vermeidung der hydraulischen Rückfallebene |
DE102021206232.6 | 2021-06-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022262911A1 true WO2022262911A1 (de) | 2022-12-22 |
Family
ID=82156403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2022/200108 WO2022262911A1 (de) | 2021-06-17 | 2022-06-02 | Vermeidung der hydraulischen rückfallebene |
Country Status (6)
Country | Link |
---|---|
US (1) | US20240278758A1 (de) |
JP (1) | JP2024520611A (de) |
KR (1) | KR20230167110A (de) |
CN (1) | CN117320933A (de) |
DE (1) | DE102021206232A1 (de) |
WO (1) | WO2022262911A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022212111A1 (de) | 2022-11-15 | 2024-05-16 | Continental Automotive Technologies GmbH | Druckhalten in redundanten Bremssystemen |
Citations (8)
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DE102011083171A1 (de) * | 2010-09-23 | 2012-03-29 | Continental Teves Ag & Co. Ohg | Haltefunktion für ein Kraftfahrzeug |
DE102012219390A1 (de) * | 2012-10-24 | 2014-04-24 | Continental Teves Ag & Co. Ohg | Bremsanlage für Kraftfahrzeuge |
DE102016202224A1 (de) * | 2016-02-15 | 2017-08-17 | Continental Teves Ag & Co. Ohg | Verfahren zum Betreiben einer Bremsanlage eines Fahrzeuges und Bremsanlage |
DE102016220752A1 (de) * | 2016-10-21 | 2018-04-26 | Continental Teves Ag & Co. Ohg | Verfahren zum Betreiben eines Bremssystems und Bremssystem |
WO2019011679A1 (de) * | 2017-07-14 | 2019-01-17 | Lucas Automotive Gmbh | Technik zum betreiben einer kraftfahrzeugbremsanlage |
DE102018002990A1 (de) * | 2018-04-12 | 2019-10-17 | Lucas Automotive Gmbh | Hydraulische Kraftfahrzeug-Bremsanlage und Verfahren zum Betreiben derselben |
WO2020020517A1 (de) * | 2018-07-24 | 2020-01-30 | Robert Bosch Gmbh | Verfahren zum betreiben eines bremssystems sowie bremssystem |
CN111002966A (zh) * | 2019-12-24 | 2020-04-14 | 精诚工科汽车系统有限公司 | 车辆制动控制方法、装置及线控助力制动系统 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018221757A1 (de) | 2018-12-14 | 2020-06-18 | Mando Corporation | Bremssystem, enthaltend einen Hauptzylinder mit einem elastischenPedalgefühlelement |
DE102019215422A1 (de) | 2019-04-09 | 2020-10-15 | Continental Teves Ag & Co. Ohg | Verfahren zum Betrieb einer Bremsanlage eines Fahrzeugs und Bremsanlage |
-
2021
- 2021-06-17 DE DE102021206232.6A patent/DE102021206232A1/de active Pending
-
2022
- 2022-06-02 CN CN202280035652.1A patent/CN117320933A/zh active Pending
- 2022-06-02 KR KR1020237038401A patent/KR20230167110A/ko unknown
- 2022-06-02 JP JP2023574207A patent/JP2024520611A/ja active Pending
- 2022-06-02 US US18/571,422 patent/US20240278758A1/en active Pending
- 2022-06-02 WO PCT/DE2022/200108 patent/WO2022262911A1/de active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011083171A1 (de) * | 2010-09-23 | 2012-03-29 | Continental Teves Ag & Co. Ohg | Haltefunktion für ein Kraftfahrzeug |
DE102012219390A1 (de) * | 2012-10-24 | 2014-04-24 | Continental Teves Ag & Co. Ohg | Bremsanlage für Kraftfahrzeuge |
DE102016202224A1 (de) * | 2016-02-15 | 2017-08-17 | Continental Teves Ag & Co. Ohg | Verfahren zum Betreiben einer Bremsanlage eines Fahrzeuges und Bremsanlage |
DE102016220752A1 (de) * | 2016-10-21 | 2018-04-26 | Continental Teves Ag & Co. Ohg | Verfahren zum Betreiben eines Bremssystems und Bremssystem |
WO2019011679A1 (de) * | 2017-07-14 | 2019-01-17 | Lucas Automotive Gmbh | Technik zum betreiben einer kraftfahrzeugbremsanlage |
DE102018002990A1 (de) * | 2018-04-12 | 2019-10-17 | Lucas Automotive Gmbh | Hydraulische Kraftfahrzeug-Bremsanlage und Verfahren zum Betreiben derselben |
WO2020020517A1 (de) * | 2018-07-24 | 2020-01-30 | Robert Bosch Gmbh | Verfahren zum betreiben eines bremssystems sowie bremssystem |
CN111002966A (zh) * | 2019-12-24 | 2020-04-14 | 精诚工科汽车系统有限公司 | 车辆制动控制方法、装置及线控助力制动系统 |
Also Published As
Publication number | Publication date |
---|---|
US20240278758A1 (en) | 2024-08-22 |
CN117320933A (zh) | 2023-12-29 |
DE102021206232A1 (de) | 2022-12-22 |
JP2024520611A (ja) | 2024-05-24 |
KR20230167110A (ko) | 2023-12-07 |
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