CN115675422A - Electromechanical brake system with backup and method of braking - Google Patents

Electromechanical brake system with backup and method of braking Download PDF

Info

Publication number
CN115675422A
CN115675422A CN202210908180.8A CN202210908180A CN115675422A CN 115675422 A CN115675422 A CN 115675422A CN 202210908180 A CN202210908180 A CN 202210908180A CN 115675422 A CN115675422 A CN 115675422A
Authority
CN
China
Prior art keywords
electromechanical
actuator
brake
brake system
electromechanical actuator
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.)
Pending
Application number
CN202210908180.8A
Other languages
Chinese (zh)
Inventor
D·盖斯-埃塞尔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Original Assignee
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH filed Critical Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Publication of CN115675422A publication Critical patent/CN115675422A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • 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
    • B60T13/58—Combined or convertible systems
    • B60T13/588—Combined or convertible systems both fluid and mechanical assistance or drive
    • 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
    • B60T13/24—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 gaseous
    • B60T13/26—Compressed-air systems
    • B60T13/261—Compressed-air systems systems with both indirect application and application by springs or weights and released by compressed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • 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
    • B60T2270/414—Power supply failure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/14—Mechanical
    • F16D2121/16—Mechanical for releasing a normally applied brake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Systems And Boosters (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

An electromechanical braking system (10) for a vehicle, the electromechanical braking system having: at least one brake system (14, 16, 30, 32) having an electromechanical actuator (20) and a brake device (18, 36) which can be actuated by the electromechanical actuator; an energy supply device (26) for supplying an electromechanical actuator (20) with electrical current, wherein the electromechanical actuator (20) is connected to the energy supply device (26) by means of an energy distribution device (28), wherein the brake system (10) has at least one activatable pneumatic actuator (22) for actuating one of the brake devices (18, 36). A method for operating an electromechanical brake system (10).

Description

Electromechanical brake system with backup and method of braking
Technical Field
The invention relates to an electromechanical brake system for a vehicle, comprising at least one brake system, which has an electromechanical actuator and a brake device that can be actuated by the electromechanical actuator, and further comprising an energy supply device for supplying the electromechanical actuator with an electric current. The invention further relates to a method for operating the electromechanical brake system.
Background
In order to still generate a sufficient residual braking action in the event of a malfunction, a plurality of energy supply devices, for example batteries, and a plurality of energy distribution devices, for example the on-board system, are often provided, so that a failure of a braking device does not occur automatically in the event of a failure of an energy supply device and/or an energy distribution device.
It is also known to connect different braking devices to different energy distribution devices. Even if one of these energy distribution devices is unable to supply sufficient energy to the brake device connected thereto, for example due to a failure of itself or due to a failure of a functional device connected thereto, a sufficient braking action can be achieved with a further, still functional brake device.
Nevertheless, current aging in a plurality of vehicle electrical systems can still result in an insufficient number of brake devices being available or only an insufficient braking force or even no braking force being generated.
Disclosure of Invention
Against this background, the object is to further develop a brake system of the type mentioned at the outset in such a way that its fail safety is further improved.
To solve this task, an electromechanical braking system according to a preferred embodiment and a method according to a preferred embodiment are proposed. Advantageous configurations are the subject of alternative embodiments.
The object is achieved by an electromechanical brake system for a vehicle, having: at least one brake system having an electromechanical actuator and a brake device that can be actuated by the electromechanical actuator. An energy supply device is provided for supplying an electric current to the electromechanical actuator, wherein the electromechanical actuator is connected to the energy supply device by means of an energy distribution device, wherein the brake system has at least one activatable pneumatic actuator for actuating one of the brake devices.
Such a pneumatic actuator can still actuate the brake device when the electrical energy for operating the electromechanical actuator is no longer available. The fail-safe of the brake system is thereby improved.
In one embodiment of the invention, the brake system is provided for activating the pneumatic actuator when the electromechanical actuator does not have full capability.
In this way, the pneumatic actuator is automatically activated when sufficient braking action is no longer ensured by the electromechanical actuator, so that the vehicle can still be braked.
In one embodiment of the invention, for activation, the pneumatic actuator has an electric valve device for controlling the pneumatic pressure, wherein the valve device is operated by supplying an electric current by the energy supply device and/or the energy distribution device and is provided for activating the pneumatic actuator.
Such a valve device can be used reliably to activate the pneumatic actuator.
In one embodiment of the invention, the electromechanical actuator and the pneumatic actuator are arranged on a brake device of the same axle of the vehicle.
In this way, the braking force which is missing in the event of a failure of the electromechanical actuator is at least partially compensated for by the pneumatic actuator on the same shaft on which the braking force is missing as a result of the failure.
In one embodiment of the invention, the electromechanical actuator with the brake device is arranged on an axle of the vehicle, wherein the pneumatic actuator with the brake device is arranged on another axle of the vehicle.
In the event of failure of several axles, it can be useful to generate an additional braking action on the other axle by means of a friction brake.
In one embodiment of the invention, at least one of the electromechanical actuators and one of the pneumatic actuators is provided for actuating a common brake device.
This results in a particularly compact design.
The object is also achieved by a method for operating such an electromechanical brake system, having the following steps: recognizing that the electromechanical actuator can only operate to a limited extent at most; the pneumatic actuator is activated when the electromechanical actuator is at most only capable of limited operation.
By automatically activating the pneumatic actuator in the event of failure or limited operation of the electromechanical actuator, the fail-safe of the brake system is increased.
In one embodiment of the invention, in order to recognize that the electromechanical actuator is only able to operate to a limited extent, one of the following conditions is satisfied: the energy supply device of the electromechanical actuator can provide at most at least reduced power relative to the rated power; the energy distribution device has a fault, whereby the power provided to the electromechanical actuator is at least reduced; the electromechanical actuator has a fault.
These conditions are checked by simple measurements and give a reliable indication: the electromechanical actuator is malfunctioning. By activating the pneumatic actuator upon recognition of one of the conditions, the fail-safety of the brake system is further increased.
In one embodiment of the invention, the invention relates to a brake system having a brake device with a spring energy store, the method having the following steps: identifying that the electromechanical actuator does not have operational capability; if the electromechanical actuator does not have a capability, the brake device is actuated by means of the spring energy store.
As a result, the vehicle is stopped by means of the spring-loaded brake in the event of a failure of the electromechanical actuator, which further increases the fail-safe of the brake system.
Drawings
The invention is explained in detail below with the aid of examples, which are only illustrated schematically in the figures. The drawings show, in detail:
FIG. 1 shows a schematic view of a braking system according to an embodiment of the invention;
FIG. 2 shows a schematic view of a braking system according to an embodiment of the invention; and
fig. 3 shows a schematic view of a brake system according to an embodiment of the invention with a spring-loaded brake.
Detailed Description
The electromechanical brake system 10 shown in fig. 1 has a first brake system 14 and a second brake system 16, which are arranged on a shaft 12. The brake systems 14, 16 each have a brake device 18 and an electromechanical actuator 20 and a pneumatic actuator 22 for actuating the brake device 18. The pneumatic actuator 22 can be activated by means of a valve device 24. The electromechanical actuator 20 and the valve device 24 require electrical energy, in particular in the form of an electric current, which is supplied by an energy supply device 26. For the sake of simplicity, the pneumatic infrastructure required for operating the pneumatic actuators 22 is not shown.
The energy supply device 18 is connected to the electromechanical actuator 20 and/or the valve device 24 by means of an energy distribution device, for example a distribution network 28. Thereby, an electric current may flow from the energy supply device 18 to the electromechanical actuator 20.
In a further embodiment, the brake system 10 has a second energy supply device. This second energy supply device can be connected to the electromechanical actuator 20 and/or the valve device 24, for example directly or by means of a distribution network.
The valve device 24 is configured as an NO valve, for example. This means that the valve device 24 is open in the currentless state (normally open, NO). The valve arrangement 24 controls the supply of pressurized air to the pneumatic actuator 22. The pneumatic actuator 22 is activated only when it has obtained a sufficient supply of air under pressure. Since the valve device 24 can interrupt the supply of pressure air, the pneumatic actuator 22 can be activated or deactivated by means of the control of the valve device 24. In particular, the valve device 24 remains closed as long as the valve device is supplied with current via the distribution network 18.
A fault may occur in the energy supply device 26 and/or the distribution network 28, which fault may result, for example, in the electromechanical actuator 20 no longer achieving a sufficient braking effect, for example, because it is supplied with too little current. In this case, the current available for the valve device 24 is no longer sufficient to keep the valve device 24 closed. As a result, the valve device 24 opens and supplies the pneumatic actuator 22 with pressurized air, thereby activating the pneumatic actuator. The pneumatic actuator 22 can then actuate the brake device 18, for example, in order to ensure the function of a service brake. For this purpose, the pneumatic actuators 22 can be connected to an operating device for operation by the driver, so that the driver can control the braking force.
That is, the valve device 24 recognizes that the electromechanical actuator 20 is only operating to a limited extent or even not operating due to a lack of current.
In a further embodiment, the valve device 24 is controlled, for example, by a control device, which is provided to detect that at least one of the electromechanical actuators 20 is at most only capable of limited operation and to activate the associated pneumatic actuator 22 when one of the electromechanical actuators 20 is not capable of operation or is only capable of limited operation. This activation can be achieved, for example, by the valve device 24 being opened.
In a further embodiment, the control device can be configured, for example, as a reference value for measuring an operating parameter of the distribution network 28 and/or the energy supply device 26. The control device may, for example, measure the voltage provided by the distribution network 28. The control device can compare the measured voltage, for example, with a predetermined threshold value, wherein the control device activates the pneumatic actuator 22 when the measured voltage drops below the threshold value. The control device can thus also react to voltage fluctuations which, if necessary, would close the valve device 24, but would no longer be sufficient to achieve a reliable function of the electromechanical actuator 20.
In order to recognize that at least one of the electromechanical actuators 20 is at most only capable of limited operation, various conditions can be checked and evaluated. In particular, if the energy supply device 26 can only supply a power which is reduced in relation to its nominal power, the electromechanical actuator 20 is considered to be at most only capable of a limited operation. Furthermore, the valve device may also have a fault, as a result of which the power supplied to the electromechanical actuator 20 is at least reduced. Furthermore, the electromechanical actuator 20 can be checked for faults.
Under certain conditions, for example in the event of a failure of the energy supply device 26: electromechanical actuator 20 the electromechanical actuator 20 is not, i.e. is not, functioning without limitation.
In further embodiments (one of these further embodiments is shown by way of example in fig. 2), the electromechanical brake system additionally has a third brake system 30 and a fourth brake system 32. Each actuator 20, 22 is arranged in its own brake device 14, 16. In a further embodiment, these brake systems 14, 16, 30, 32 are each arranged together with their actuators 20, 22 on different axles 12 of the vehicle.
In a further embodiment, the brake devices 36 of the third brake system 30 and the fourth brake system 32 (which are each provided with a pneumatic actuator 22) are designed as spring-loaded brakes 36. In the rest state, the spring-loaded brake 36 is designed to exert its full braking action. The spring-loaded brake is released by filling it with pressurized air. The vehicle can only be started when the spring-loaded brake is released by building up pneumatic pressure. The valve arrangement 24 remains closed as long as the electromechanical actuator 20 is operable. If a failure (e.g., a power failure) is identified, the valve arrangement 24 opens and allows pressurized air to escape from the pneumatic actuator 22 of the spring-loaded brake 36. Thereby, the vehicle mounted with the brake apparatus 10 is automatically braked at the time of failure of the power supply. That is, the valve arrangement 24 is provided, for example, for activating the pneumatic actuator 22 in the event of an insufficient and/or missing supply of electric current.
In a further embodiment shown in fig. 3, the valve devices 24 are each provided with a flow restriction device, for example in the form of a nozzle. If it is now recognized that the electromechanical actuator 22 is only activated to a limited extent or is not activated and the pneumatic actuator 22 of the spring-loaded brake 36 is vented, the braking action of the spring-loaded brake 36 is not suddenly and immediately fully performed. This can lead to stability problems for the vehicle. Instead, the braking action develops slowly and gradually, so that firstly a slight braking action occurs and then a stronger and stronger braking action occurs over time. This gives the driver of the vehicle, for example, time to take a subsequent braking action.
In its simplest form, the distribution network 28 and the energy distribution devices are connected directly to each other by cables.
The electromechanical actuator 20 can only operate to a limited extent if it is not supplied with the current or the power required for normal operation, but rather with a reduced current or reduced power compared to this. The braking force that can be achieved with the electromechanical actuator 20 and the braking device 18 is then reduced. The required current and the required power are generally known.
When the electric actuator no longer obtains current or power (which may cause a braking force related to the required braking force), for example when the power or current drops below 25% of the nominal power or nominal current, the electric actuator 20 no longer has operational capacity.
The present invention improves the fail-safe of the electromechanical braking system 10.
List of reference numerals
10. Electromechanical braking system
12. Shaft
14. First brake device
16. Second brake device
18. Brake device
20. Electromechanical actuator
22. Pneumatic actuator
24. Valve device
26. Energy supply device
28. Distribution network (energy distribution device)
30. Third brake device
32. Fourth brake device
36. Spring energy storage brake (brake device)
38. Nozzles (flow restriction devices).

Claims (9)

1. An electromechanical braking system (10) for a vehicle, the electromechanical braking system having: at least one brake system (14, 16, 30, 32) having an electromechanical actuator (20) and a brake device (18, 36) which can be actuated by the electromechanical actuator; energy supply device (26) for supplying an electromechanical actuator (20) with electrical current, wherein the electromechanical actuator (20) is connected to the energy supply device (26) by means of an energy distribution device (28), characterized in that the brake system (10) has at least one activatable pneumatic actuator (22) for actuating one of the brake devices (18, 36).
2. The electromechanical brake system according to claim 1, characterized in that the brake system (10) is provided for activating the pneumatic actuator (22) when the electromechanical actuator (20) does not have full working capacity.
3. Electromechanical brake system according to claim 1 or 2, characterized in that for activation the pneumatic actuator (22) has an electrovalve device (24) controlling the pneumatic pressure, wherein the valve device (24) is operated by supplying current by the energy supply device (26) and/or the energy distribution device (28) and is provided for activating the pneumatic actuator (22).
4. Electromechanical brake system according to one of the preceding claims, characterized in that the electromechanical actuator (20) and the pneumatic actuator (22) are arranged on a brake device (18, 36) of the same axle (12) of the vehicle.
5. Electromechanical brake system according to one of claims 1 to 3, characterized in that the electromechanical actuator (20) with the brake device (18) is arranged on an axle (12) of the vehicle, wherein the pneumatic actuator (22) with the brake device (18, 36) is arranged on another axle (12) of the vehicle.
6. Electromechanical brake system according to one of the claims 1 to 4, characterized in that at least one of the electromechanical actuators (20) and one of the pneumatic actuators (22) is provided for operating a common brake device (18).
7. Method for operating an electromechanical braking system according to one of the preceding claims, characterized by the following steps:
identifying that the electromechanical actuator (20) can only operate at most in a limited manner;
when the electromechanical actuator (20) can only be operated to a limited extent at most, the pneumatic actuator (22) is activated.
8. A method for operating an electromechanical brake system according to claim 7,
in order to recognize that the electromechanical actuator (20) can only operate in a limited manner, one of the following conditions is satisfied:
the energy supply device (26) of the electromechanical actuator (20) is capable of supplying at most at least a reduced power in relation to the nominal power;
the energy distribution device (24) has a fault, whereby the power supplied to the electromechanical actuator (20) is at least reduced;
the electromechanical actuator (20) has a fault.
9. Method for operating an electromechanical brake system according to claim 7 or 8, wherein the brake device (36) operable by the pneumatic actuator (22) has a spring accumulator, characterized by the steps of:
identifying that the electromechanical actuator (20) does not have operational capability;
if the electromechanical actuator (20) has no operating capability, a brake device (36) is actuated by means of the spring energy store.
CN202210908180.8A 2021-07-30 2022-07-29 Electromechanical brake system with backup and method of braking Pending CN115675422A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021119940.9 2021-07-30
DE102021119940.9A DE102021119940A1 (en) 2021-07-30 2021-07-30 Electromechanical braking system with backup and braking procedures

Publications (1)

Publication Number Publication Date
CN115675422A true CN115675422A (en) 2023-02-03

Family

ID=84890118

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210908180.8A Pending CN115675422A (en) 2021-07-30 2022-07-29 Electromechanical brake system with backup and method of braking

Country Status (2)

Country Link
CN (1) CN115675422A (en)
DE (1) DE102021119940A1 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021099307A1 (en) 2019-11-18 2021-05-27 Zf Cv Systems Global Gmbh Failsafe vale unit, electronically controllable pneumatic brake system, method for operating a brake system

Also Published As

Publication number Publication date
DE102021119940A1 (en) 2023-02-02

Similar Documents

Publication Publication Date Title
CN107921941B (en) Electric parking brake device with additional energy supply
CN111801254B (en) Electric equipment for vehicle
CN105015530B (en) Electric parking brake for vehicle
US9545907B2 (en) Control valve device for a rail vehicle brake
CN114616147B (en) Fail-safe valve unit, electronically controllable pneumatic brake system, method for operating a brake system
EP2567872B1 (en) Systems and methods for emergency braking system
CN108116393B (en) Method and device for operating a hydraulic brake system, brake system
CN111108029B (en) Electronic pneumatic brake system with test mode for pneumatic backup brake circuit
CN110650875A (en) Braking device and method for performing emergency braking of a rail vehicle
CN112672935B (en) Brake control valve system
CN112829733B (en) Emergency braking control device, emergency braking system and railway vehicle
KR20230053638A (en) Method for checking availability of hydraulic fallback level in electronic slip controlled power brake system, electronic control device for electronic slip controlled power brake system and electronic slip controlled power brake system having electronic control device
WO2009140091A2 (en) Braking system
CN108137024B (en) Pneumatic brake system with electromagnetic brake release valve for railway vehicles
CN115675422A (en) Electromechanical brake system with backup and method of braking
US11691608B2 (en) By-pass of air supply protection for electronic parking brake system and vehicle comprising such system
JPH1068401A (en) Pressure medium device
CN117396383A (en) Electro-pneumatic device for a vehicle with an autonomous brake circuit that is supplied prophylactically with a standby pressure
KR20160100372A (en) Motor vehicle
JP7041526B2 (en) Electronic control unit and braking control device
CN112572392B (en) Vehicle braking system and vehicle braking system control method
CN112703137B (en) Brake control valve device
CN116438103A (en) Fail-safe valve unit, electronically controllable pneumatic brake system, vehicle, method
JP7546511B2 (en) Brake control device, and inspection method and program for brake control device
US11498542B2 (en) Method and control unit for operating a brake system of a vehicle

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination