WO2024115501A1 - Système de freinage comportant un dispositif de freinage de parking a sécurité de fonctionnement augmentée - Google Patents
Système de freinage comportant un dispositif de freinage de parking a sécurité de fonctionnement augmentée Download PDFInfo
- Publication number
- WO2024115501A1 WO2024115501A1 PCT/EP2023/083391 EP2023083391W WO2024115501A1 WO 2024115501 A1 WO2024115501 A1 WO 2024115501A1 EP 2023083391 W EP2023083391 W EP 2023083391W WO 2024115501 A1 WO2024115501 A1 WO 2024115501A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- parking
- brake
- parking brake
- control unit
- brakes
- 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.)
- Ceased
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
- 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
- B60T7/045—Brake-action initiating means for personal initiation foot actuated with locking and release means, e.g. providing parking brake application
-
- 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
- B60T13/741—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 an ultimate actuator
-
- 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
- B60T7/08—Brake-action initiating means for personal initiation hand actuated
- B60T7/10—Disposition of hand control
- B60T7/107—Disposition of hand control with electrical power assistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/88—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
- B60T8/885—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry
-
- 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
- B60T2270/413—Plausibility monitoring, cross check, redundancy
Definitions
- the present invention relates to a braking system comprising a parking braking device for a motor vehicle and to a method of operating such a braking system.
- Motor vehicles are equipped with a braking system comprising a brake on each wheel.
- the braking system provides service braking, which slows the vehicle down and stops it.
- Service braking is generally obtained by pressing a brake pedal.
- Service braking can be managed automatically by a control unit, for example in the case where automatic speed regulation is desired.
- the braking system also provides parking braking or parking braking which aims to immobilize the vehicle when it is parked.
- the parking brake can also be used as an emergency brake. According to the ECE R 13-H regulation, the parking brake system must keep the loaded vehicle stationary on an 8% slope.
- the braking system includes a parking brake on each rear wheel.
- the parking brake is integrated into the service brake.
- the parking brake was activated by the driver pulling on a brake lever connected directly to the rear wheel brakes by a cable; the greater the traction, the greater the level of parking braking. .
- activation of the parking brake is obtained by pressing a button which sends a signal to the control unit which activates electric motors located at the rear wheels.
- the electric motor ensures that the brake pads are pressed against a brake disc in the case of a disc brake, or that the brake linings are pressed against a drum in the case of a drum brake.
- a parking braking system comprising at least two electric parking brakes, one being intended to equip one of the rear wheels, and the other being intended to equip the other wheel rear, a control unit for the electric parking brakes, a status sensor for each of the electric parking brakes, the control unit being configured to compare the operating state of each of the electric parking brakes during a parking braking phase and adapt the operation of one of the electric parking brakes according to the operation of the other electric parking brake, so that the vehicle is kept stationary.
- the other electric parking brake is controlled to compensate at least in part for the failure of the electric parking brake. For this the braking level on the functional electric parking brake is increased.
- This braking system can then make it possible to comply with the ECE R 13-H regulation.
- the failure appears while the other electric parking brake is about to be activated or is being activated, in this case the activation orders are modified during activation so that the braking level takes into account of the failure.
- the failure appears while the other electric parking brake is already in the engaged state, in this case a new phase of activation of the other electric parking brake is launched to take account of the failure .
- each parking brake can be activated separately while taking into account the operating state of the other parking brake(s), which makes it possible to ensure the function immobilization of the motor vehicle despite the failure of the other parking brake(s).
- An object of the present invention is then a braking system comprising a parking braking device for a motor vehicle comprising at least a first electrically actuated parking brake intended to be positioned at the level of a first wheel, a second parking brake with electrical actuation intended to be positioned at the level of a second wheel, a control unit configured to generate an order to the first and second parking brakes to apply a given parking braking force, means for determining the operating state of each of the first and second electric parking brakes, the control unit also being configured, during a malfunction of the first parking brake, to generate an order to the second parking brake to apply at least said force parking braking given to ensure immobilization of the motor vehicle.
- control unit is configured, during a malfunction of the first parking brake, to generate an order to the second parking brake to apply an additional parking braking force compared to the force parking brake given
- control unit can be configured, during a malfunction of the first parking brake, during a power supply phase of the second brake to extend the power supply of the second parking brake by so that it applies an additional parking braking force compared to the given parking braking force
- control unit is configured, during a malfunction of the first parking brake after the end of a power supply phase of the second brake, to power the second parking brake again, so that it applies an additional parking braking force compared to the given parking braking force.
- the means for determining the operating state of each of the first and second electric parking brakes comprise means for measuring the supply current of the electric motor and/or a position sensor of a mobile element linked to a gear motor for each of the first and second electric parking brakes.
- Another object of the present invention is a braking system comprising a parking braking system according to the invention and at least two service brakes, the parking brakes being integrated into the service brakes.
- Another object of the present invention is a method of operating a parking braking system comprising at least a first electrically actuated parking brake intended to be positioned at the level of a first wheel, a second actuated parking brake electric intended to be positioned at the level of a second wheel and a control unit connected to the parking brakes and to means for determining the operating state of each of the first and second electric parking brakes, said method comprising the steps : a) generation by the control unit of an order to each of the parking brakes to apply a braking force capable of ensuring immobilization of the vehicle, b) detection of the malfunction of the first parking brake, c) generation by the control unit an order to the second parking brake to apply a parking braking force.
- the second parking brake is commanded to increase the braking force that it exerts on the wheel up to a determined value.
- the operating method can advantageously include a step of determining the immobilization value by the control unit on the basis of information on the parking state of the motor vehicle.
- the determination step may include taking into account the braking force applied by the first parking brake in a malfunctioning state.
- the operating method can advantageously include the generation by the control unit to the driver of a message informing him of the malfunction of the first parking brake.
- FIG. 1 is a representation of a braking system according to an exemplary embodiment
- FIGS. 2A and 2B are graphic representations of the variation in the supply current of the electric parking brake and the variation in the clamping force which results for the two parking brakes in a first operating configuration
- FIGS. 3A and 3B are graphical representations of the variation in the supply current of the electric parking brake and the variation in the clamping force which results for the two parking brakes in a second operating configuration.
- Hydraulic brakes generally provide service braking.
- the braking system also includes a parking braking device comprising a first parking brake FP1 at the right rear wheel and a second parking brake FP2 at the left rear wheel.
- the FP1 and FP2 parking brakes are electric parking brakes. Generally the parking brake is integrated into the service brake.
- a gear motor is integrated into the brake and ensures the movement of the piston, for example by means of a screw-nut system.
- a gear motor fixed on the plate ensures the application of the linings against the drum, for example by means of a screw-nut system.
- the parking braking system When the parking braking system includes two parking brakes, these are generally arranged to act on the two wheels of the same axle.
- a braking system with four parking brakes and/or an electric service braking system is not outside the scope of this application.
- the braking system also includes a control unit UC intended to control in particular the actuation of the electric parking brakes FP1 and FP2.
- the actuation of the electric parking brakes is obtained either by a command from the driver by pressing a button, generally in the form of a small lever, or any other means of control, for example a voice command, or by automatic for example when the engine stops.
- This signal is detected by the control unit which sends an order to the gear motors of each of the parking brakes FP1 and FP2 to apply a braking force.
- the intensity of the brake force commanded depends on the slope on which the vehicle is parked.
- the braking system receives information on the parking state of the vehicle, in particular on the inclination of the vehicle.
- the braking system comprises means DI and D2 for detecting the operating state of each of the parking brakes FP1 and FP2 respectively.
- these means measure the level of tightening of the brake on the disc or on the drum.
- the operating state is for example determined through knowledge of the braking level, which can be obtained by measuring the supply current of the electric motor which increases when the force of braking increases.
- the determination means comprise a position sensor of a mobile element linked to the geared motor, for example a position sensor of the screw on the nut.
- control unit is further configured to be able to take into account the operating state of one of the parking brakes FP1, FP2 to control the other parking brake FP2, FP1 respectively and ensure the immobilization of the vehicle.
- the control unit is informed of the failure of one of the parking brakes FP1 and FP2 and sends orders to the other parking brake so that it at least partially compensates for this failure.
- the term "failing parking brake” means a parking brake which cannot apply any braking force to the wheel it equips, or a braking force which is less than the force required for the vehicle parking status.
- the failure may be mechanical and/or electrical and/or electronic.
- Each of the graphs shows the braking force to be achieved calculated in normal operation, designated FT1, FT2 for brake FP1 and brake FP2 respectively.
- This braking force to be achieved was determined by the unit of UC control depending on the parking situation.
- FT1 is equal to FT2.
- the control unit sends an instruction to apply parking braking to the two brakes FP1, FP2, which are then supplied with current.
- the current supply to brake FP2 begins at tl prior to that of brake FP1 which begins at t2.
- the first current peak corresponds to a peak for starting the electric motor and taking up clearance, in particular between the gears of the electric motor, the screw-nut system and the brake pad.
- the current supply 12 causes the generation of a clamping force represented by the appearance of a second current peak which corresponds to a phase of force creation by the contact between the brake pad and the disk.
- the control unit detects the malfunction of the brake FP1 and simultaneously modifies the instructions to the brake FP2 so that the braking force it applies takes into account the malfunction of the brake FP1, and at least partially compensates for this malfunction.
- the electric motor of brake FP2 is then supplied with current 12 longer so that the clamping force reaches a value FS2, ensuring the immobilization of the vehicle as if the two parking brakes were functional.
- the FS2 value is calculated by the control unit UC depending on the parking state of the vehicle or is collected in a previously established database.
- the parking brakes can be sized to each individually ensure immobilization of the loaded vehicle on a slope of up to 8%.
- the failure of brake FP1 is simultaneous with the activation phase of brake FP2, which is followed by the correction of its activation order.
- the control unit is capable of sending two different successive orders to the same parking brake.
- the vehicle is immobilized as it would be if all the parking brakes were functioning correctly.
- it is then planned to send information to the driver about the malfunction of the parking braking system, and so that he can have the parking braking system checked.
- This information is for example in the form of a display of a message or a warning light on the dashboard and/or the emission of a message or sound signal.
- the vehicle is immobilized following the detection of the failure of the brake FP1.
- the FP2 parking brake remains activated.
- the only possibility of deactivating the parking brake is, for example, the intervention of a professional who informs the control unit.
- This braking force Fil is detected at time t4, after time t3.
- the control unit then generates a new control order to brake FP2 so that it adjusts its braking level to the failure of brake FP1.
- This new order triggers a second phase of PHASE2 operation.
- the electric motor of the FP2 brake is again supplied with current 12.
- control unit does not take Fil into account, considering that the brake FP1 having failed, it is no longer reliable, which offers maximum security.
- the braking force to be applied takes into account the residual force Fil applied by the brake FP1.
- the electric motor of brake FP2 is activated again and the braking force applied by brake FP2 reaches the value FS2 ensuring the vehicle is immobilized safely.
- the control unit sends information to the driver on the faulty state of the parking braking system, for example by displaying a message or a warning light on the dashboard and/or the emission of a message or sound signal.
- a message may be sent to an organization providing motor vehicle repair and/or maintenance services.
- the functional parking brake is controlled so that it compensates for the malfunction of the other parking brake.
- a braking system in which the functional parking brake is controlled to ensure safe immobilization of the vehicle and enable its repair is within the scope of the present invention.
- the control unit controls the functional parking brake so that it provides braking identical to that which it would have provided if the other brake had been functional.
- the parking braking system nevertheless ensures the immobilization of the vehicle, unlike parking braking systems of the state of the art.
- control unit is configured to control the parking brakes so as to at least partially compensate for the malfunction of one or more parking brakes.
- control unit carries out checks on the braking situation of each of the parking brakes in order to check if one does not present a malfunction, and act on the other parking brake accordingly.
- the present invention offers the advantage of significantly increasing the level of safety of the parking braking system by integrating the risk of failure of one of the electric parking brakes.
- DI means of determining the operating state of the first parking brake
- D2 means for determining the operating state of the first parking brake
- FT1 braking force to be achieved in normal operation by the first parking brake
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (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 |
|---|---|---|---|
| CN202380074629.8A CN120091941A (zh) | 2022-11-30 | 2023-11-28 | 包括具有增加的操作可靠性的驻车制动装置的制动系统 |
| EP23810417.8A EP4626758A1 (fr) | 2022-11-30 | 2023-11-28 | Système de freinage comportant un dispositif de freinage de parking a sécurité de fonctionnement augmentée |
| JP2025525801A JP2025538146A (ja) | 2022-11-30 | 2023-11-28 | 作動信頼性を高めたパーキングブレーキ装置を含むブレーキシステム |
| DE23810417.8T DE23810417T1 (de) | 2022-11-30 | 2023-11-28 | Bremssystem mit einer feststellbremsvorrichtung mit erhöhter betriebssicherheit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2212590A FR3142420A1 (fr) | 2022-11-30 | 2022-11-30 | Système de freinage comportant un dispositif de freinage de parking a sécurité de fonctionnement augmentée |
| FRFR2212590 | 2022-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024115501A1 true WO2024115501A1 (fr) | 2024-06-06 |
Family
ID=85018316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2023/083391 Ceased WO2024115501A1 (fr) | 2022-11-30 | 2023-11-28 | Système de freinage comportant un dispositif de freinage de parking a sécurité de fonctionnement augmentée |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4626758A1 (fr) |
| JP (1) | JP2025538146A (fr) |
| CN (1) | CN120091941A (fr) |
| DE (1) | DE23810417T1 (fr) |
| FR (1) | FR3142420A1 (fr) |
| WO (1) | WO2024115501A1 (fr) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9428159B2 (en) * | 2010-10-18 | 2016-08-30 | Continental Teves Ag & Co. Ohg | Fail-safe parking brake for motor vehicles |
| US10351110B2 (en) * | 2014-05-15 | 2019-07-16 | Continental Teves Ag & Co. Ohg | Brake system for motor vehicles |
| US20190344762A1 (en) * | 2016-12-27 | 2019-11-14 | Lucas Automotive Gmbh | Motor vehicle control unit for an electric parking brake |
| CN114248741A (zh) * | 2020-09-21 | 2022-03-29 | 长城汽车股份有限公司 | 车辆控制方法、系统及车辆 |
-
2022
- 2022-11-30 FR FR2212590A patent/FR3142420A1/fr active Pending
-
2023
- 2023-11-28 JP JP2025525801A patent/JP2025538146A/ja active Pending
- 2023-11-28 CN CN202380074629.8A patent/CN120091941A/zh active Pending
- 2023-11-28 DE DE23810417.8T patent/DE23810417T1/de active Pending
- 2023-11-28 EP EP23810417.8A patent/EP4626758A1/fr active Pending
- 2023-11-28 WO PCT/EP2023/083391 patent/WO2024115501A1/fr not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9428159B2 (en) * | 2010-10-18 | 2016-08-30 | Continental Teves Ag & Co. Ohg | Fail-safe parking brake for motor vehicles |
| US10351110B2 (en) * | 2014-05-15 | 2019-07-16 | Continental Teves Ag & Co. Ohg | Brake system for motor vehicles |
| US20190344762A1 (en) * | 2016-12-27 | 2019-11-14 | Lucas Automotive Gmbh | Motor vehicle control unit for an electric parking brake |
| CN114248741A (zh) * | 2020-09-21 | 2022-03-29 | 长城汽车股份有限公司 | 车辆控制方法、系统及车辆 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3142420A1 (fr) | 2024-05-31 |
| DE23810417T1 (de) | 2026-04-23 |
| CN120091941A (zh) | 2025-06-03 |
| JP2025538146A (ja) | 2025-11-26 |
| EP4626758A1 (fr) | 2025-10-08 |
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