WO2023070635A1 - 一种制动系统、车辆及制动系统的控制方法 - Google Patents

一种制动系统、车辆及制动系统的控制方法 Download PDF

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Publication number
WO2023070635A1
WO2023070635A1 PCT/CN2021/127788 CN2021127788W WO2023070635A1 WO 2023070635 A1 WO2023070635 A1 WO 2023070635A1 CN 2021127788 W CN2021127788 W CN 2021127788W WO 2023070635 A1 WO2023070635 A1 WO 2023070635A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
parking
piston
brake
move
Prior art date
Application number
PCT/CN2021/127788
Other languages
English (en)
French (fr)
Inventor
凌铭泽
马文涛
朱飞白
周勇有
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2021/127788 priority Critical patent/WO2023070635A1/zh
Priority to EP21961986.3A priority patent/EP4410616A1/en
Priority to CN202180103709.2A priority patent/CN118201826A/zh
Publication of WO2023070635A1 publication Critical patent/WO2023070635A1/zh

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/74Transmitting 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/10Transmitting 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
    • B60T13/58Combined or convertible systems
    • B60T13/588Combined or convertible systems both fluid and mechanical assistance or drive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/10Transmitting 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
    • B60T13/66Electrical control in fluid-pressure brake systems
    • B60T13/662Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/74Transmitting 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
    • B60T13/741Transmitting 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/74Transmitting 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
    • B60T13/745Transmitting 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

Definitions

  • the present application relates to the technical field of vehicles, in particular to a braking system, a vehicle and a control method of the braking system.
  • Parking brake methods generally include hand brakes and electronic parking (electrical park brake, EPB).
  • the traditional handbrake is a cable type, and the user can transmit the parking force to the parking device by pulling the handbrake lever, and the pulling degree of the handbrake lever determines the magnitude of the parking force.
  • the electronic parking brake is operated by pressing the button switch. By pressing and lifting the button, an instruction is sent to the control unit of the electronic parking device, and the control unit controls the brake caliper to apply parking to the brake disc. force to realize the parking brake.
  • Some electronic parking devices are generally equipped with a deceleration mechanism.
  • the power output by the motor needs to be decelerated by the deceleration mechanism to increase the torque and then transmitted to the brake caliper, so that the brake caliper clamps the brake disc;
  • the power output by the motor in reverse will also be transmitted to the brake caliper through the deceleration mechanism, so that the brake caliper releases the brake disc.
  • the deceleration mechanism Due to the existence of the deceleration mechanism, the structure of the electronic parking device is more complicated, the size is larger, and the noise is more obvious during the process of parking or releasing the parking, which affects the noise, vibration and roughness (noise, vibration) of the vehicle. , harshness, NVH) performance.
  • the present application provides a braking system, a vehicle and a control method for the braking system, which simplifies the structure of the braking system and improves the NVH performance of the vehicle on the premise of realizing reliable parking.
  • the present application provides a braking system, which may include a brake cylinder, a braking device and a parking device.
  • the brake cylinder may include a piston
  • the piston is movably disposed in the cylinder
  • the first end of the piston may be located inside the brake cylinder
  • the second end of the piston may protrude to the outside of the brake cylinder.
  • the brake device is connected with the brake cylinder, and the brake device can drive the piston to move.
  • the parking device may include a motor and a transmission assembly, the output shaft of the motor may be directly connected to the transmission assembly, the transmission assembly is at least partly arranged in the brake cylinder, and the motor may be used to drive the transmission assembly to move in the brake cylinder, so that the transmission assembly can Contact or separation from the first end of the piston.
  • the brake system uses the power assist of the brake device during parking, so that the torque output by the motor of the parking device is small, so the power requirement for the motor is also small, so that on the one hand, the cost of the motor can be reduced.
  • the transmission assembly may include a screw and a nut
  • the output shaft of the motor may be directly connected to the screw
  • the screw may extend into the brake cylinder
  • the nut is located in the brake cylinder
  • the nut and the screw are screwed together.
  • the motor drives the screw to rotate
  • the screw can drive the nut to move, so that the nut contacts or separates from the first end of the piston.
  • the axial direction of the screw rod can be consistent with the length direction of the cylinder body, so that the moving direction of the nut in the cylinder body is also consistent with the moving direction of the piston, so that when the nut abuts against the first end of the piston, the nut will The force applied to the piston is directed in the same direction as the piston is moving, thereby reducing the risk of piston sticking.
  • the first end of the nut can be provided with an opening, the end of the screw can extend into the opening, and the nut is mounted on the end of the screw, so the nut is also located in the opening.
  • the motor drives the screw to rotate to drive the nut to move, the nut can abut against the bottom of the hole, so that the piston is applied with a force away from the direction of the motor.
  • the braking system may also include a brake caliper and a brake disc, the brake caliper is connected to the second end of the piston, and the brake disc may be arranged in the clamping space of the brake caliper, so that When the piston moves, it can drive the brake caliper to clamp or loosen the brake disc.
  • the brake caliper may include two friction blocks opposite to each other.
  • the two friction blocks may be respectively arranged on both sides of the brake disc. Move towards or away from each other under the action, thereby changing the size of the clamping space of the brake caliper.
  • the braking system may further include a control unit, which may be used to: acquire a parking signal, and control the brake device to drive the piston to move according to the parking signal; when the piston moves to the first position, control the motor The drive transmission assembly moves to a position where it abuts against the first end of the piston.
  • a control unit which may be used to: acquire a parking signal, and control the brake device to drive the piston to move according to the parking signal; when the piston moves to the first position, control the motor The drive transmission assembly moves to a position where it abuts against the first end of the piston.
  • control unit is further configured to: obtain the hydraulic pressure of the brake cylinder, and when the hydraulic pressure in the brake cylinder is not less than the target hydraulic pressure, the second end of the control piston moves to the first position. It can be understood that the first position is the position where the second end of the piston is when the brake caliper clamps the brake disc to stop the rotation of the brake disc.
  • the braking device may include a first hydraulic device and a second hydraulic device, and the first hydraulic device and the second hydraulic device may be respectively connected to the brake cylinder.
  • the control unit can also be used to: when the first hydraulic device fails, control the second hydraulic device to drive the piston to move; or, when the second hydraulic device fails, control the first hydraulic device to drive the piston to move; or, when the first hydraulic device fails, When neither the device nor the second hydraulic device fails, the first hydraulic device and the second hydraulic device are controlled to jointly drive the piston to move.
  • the first hydraulic device and the second hydraulic device can work together or be redundant with each other, so that even if one of the hydraulic devices fails, it can ensure that the braking device as a whole can continue to operate normally, thereby improving braking performance. device reliability.
  • control unit is further configured to: acquire the running state of the vehicle, determine the parking mode of the vehicle according to the running state of the vehicle, and determine the target hydraulic pressure according to the parking mode.
  • the target hydraulic pressure can be more accurately determined according to the operating state of the vehicle, thereby enabling the vehicle to reliably apply the parking brake.
  • the control unit can also be used to determine the first parking mode when there is no external request for the vehicle and the running state of the vehicle meets the parking conditions.
  • the first parking mode can be determined according to the vehicle parameters.
  • Vehicle force, the first parking force is the target hydraulic pressure; or, when there is an external request for the vehicle and the vehicle’s running state does not meet the parking conditions, the second parking mode can be determined, and the second parking mode can be determined according to the external request.
  • the second parking force is the target hydraulic pressure; or, when there is an external request for the vehicle and the operating conditions of the vehicle meet the parking conditions, the third parking mode is determined, and the first parking mode can be force is the target parking force, or the larger value of the first parking force and the second parking force is the target hydraulic pressure.
  • the external request of the vehicle includes, but is not limited to, that the vehicle is in an intelligent driving mode, an anti-lock brake mode, or a driving assistance mode, and the like.
  • the vehicle parameters may include one or more of the gradient of the road on which the vehicle is located, the mass of the vehicle, whether the vehicle is attached with a trailer, or the temperature of the brake disc.
  • the control unit can also be used to: when the vehicle receives the parking command, according to the vehicle speed is less than or equal to the parking speed threshold, the wheel speed of the vehicle is less than or equal to the parking wheel speed Threshold value, the opening degree of the accelerator pedal of the vehicle is less than or equal to the opening degree threshold value, and it is determined that the running state of the vehicle satisfies the parking condition.
  • control unit can also be used to: when the vehicle is in a rolling state, control the braking device to drive the piston to move, so that the vehicle can return to a stationary state from the rolling state;
  • the motor is controlled to drive the screw to rotate, and the screw drives the nut to move to the position abutting against the first end of the piston, so as to fix the position of the piston and realize the parking brake of the vehicle again.
  • the second position is located on a side of the first position away from the first end of the piston.
  • the present application also provides a method for controlling a brake system, wherein the brake system may include a brake cylinder, a brake device and a parking device.
  • the brake cylinder may include a piston
  • the piston is movably disposed in the cylinder
  • the first end of the piston may be located inside the brake cylinder
  • the second end of the piston may protrude to the outside of the brake cylinder.
  • the brake device is connected with the brake cylinder, and the brake device can drive the piston to move.
  • the parking device may include a motor and a transmission assembly, the output shaft of the motor may be directly connected to the transmission assembly, the transmission assembly is at least partly arranged in the brake cylinder, and the motor may be used to drive the transmission assembly to move in the brake cylinder, so that the transmission assembly can Contact or separation from the first end of the piston.
  • This control method can include:
  • control the brake device to drive the piston to move
  • control motor drives the transmission assembly to move to a position where it abuts against the first end of the piston.
  • the torque output by the motor of the parking device is relatively small through the power assist of the braking device, so the power requirement for the motor is also small.
  • the motor can be reduced.
  • the deceleration mechanism used for torque boosting can be omitted in the parking device, so that the structure of the parking device can be simplified, and the overall NVH performance of the vehicle can be improved.
  • control method may further include: obtaining the hydraulic pressure of the brake cylinder, and when the hydraulic pressure in the brake cylinder is not less than the target hydraulic pressure, the second end of the control piston moves to the first position. It can be understood that the first position is the position where the second end of the piston is when the brake caliper clamps the brake disc to stop the rotation of the brake disc.
  • the braking device may include a first hydraulic device and a second hydraulic device, and the first hydraulic device and the second hydraulic device may be respectively connected to the brake cylinder.
  • Controlling movement of the braking device to the drive piston may include:
  • the first hydraulic device fails, control the second hydraulic device to drive the piston to move; or, when the second hydraulic device fails, control the first hydraulic device to drive the piston to move; or, when the first hydraulic device and the second hydraulic device
  • the first hydraulic device and the second hydraulic device are controlled to jointly drive the piston to move. That is to say, the first hydraulic device and the second hydraulic device can work together or be redundant with each other, so that even if one of the hydraulic devices fails, it can ensure that the braking device as a whole can continue to operate normally, thereby improving braking performance. device reliability.
  • control method may also include:
  • the running state of the vehicle is acquired, the parking mode of the vehicle is determined according to the running state of the vehicle, and the target hydraulic pressure is determined according to the parking mode.
  • the target hydraulic pressure can be more accurately determined according to the operating state of the vehicle, thereby enabling the vehicle to reliably apply the parking brake.
  • the parking mode of the vehicle is determined according to the running state of the vehicle, and the target hydraulic pressure is determined according to the parking mode, which may specifically include:
  • the first parking mode determines the first parking force according to the vehicle parameters, and the first parking force is the target hydraulic pressure
  • the third parking mode is determined.
  • the first parking force can be used as the target hydraulic pressure, or the first parking force and the second parking force
  • the maximum value in is the target hydraulic pressure.
  • control method may also include:
  • the vehicle's running speed is determined according to the vehicle speed being less than or equal to the parking speed threshold, the vehicle's wheel speed being less than or equal to the parking wheel speed threshold, and the vehicle's accelerator pedal opening being less than or equal to the opening threshold.
  • control method may also include:
  • the braking device When the vehicle is in a rolling state, the braking device is controlled to drive the piston to move, so that the vehicle returns to a stationary state from the rolling state;
  • the control motor drives the transmission assembly to move to a position where it abuts against the first end of the piston, so as to fix the position of the piston and realize the parking brake of the vehicle again, wherein the first The second position is located on a side of the first position away from the first end of the piston.
  • the present application further provides a computing device, the computing device includes a processor, configured to implement the method described in the second aspect above.
  • the computing device may also include memory for storing program instructions and data.
  • the memory is coupled to the processor, and when the processor executes the program instructions stored in the memory, the method described in the second aspect above can be implemented.
  • the communication device may further include a communication interface, which is used for the device to communicate with other devices.
  • the communication interface may be a transceiver, a circuit, a bus, a module or other types of communication interfaces.
  • the embodiment of the present application also provides a computer-readable storage medium, where a computer program or instruction is stored in the computer-readable storage medium, and when the computer program or instruction is run on a computer, the The computer implements the method provided in the second aspect above.
  • the embodiment of the present application further provides a computer program, which enables the computer to implement the method provided in the above second aspect when the computer program is run on the computer.
  • the present application also provides a brake system control device, which may include an acquisition unit and a processing unit, wherein:
  • the acquiring unit is used to acquire a parking signal
  • the processing unit is used to control the brake device to drive the piston of the brake cylinder to move according to the parking signal, the piston has a first end located in the brake cylinder, and a first end extending out of the brake cylinder. second end; when the second end of the piston moves to the first position, the motor-driven transmission assembly that controls the parking device moves to a position where it abuts against the first end of the piston, wherein the transmission assembly At least partially within the brake cylinder.
  • the processing unit can also be used to:
  • the processing unit can be used specifically for:
  • the acquiring unit can also be used to acquire the running state of the vehicle
  • the processing unit is further configured to: determine a parking mode of the vehicle according to the running state of the vehicle, and determine the target hydraulic pressure according to the parking mode.
  • the processing unit can also be used to:
  • the vehicle When the vehicle does not have the external request, and the running state of the vehicle satisfies the parking condition, determine the first parking mode, determine the first parking force according to the vehicle parameters, and the first parking force is the specified the stated target hydraulic pressure; or,
  • determine a third parking mode determine that the first parking force is the target hydraulic pressure, or determine the The larger value of the first parking force and the second parking force is the target hydraulic pressure.
  • the processing unit can also be used to:
  • the vehicle speed of the vehicle is less than or equal to the parking speed threshold
  • the wheel speed of the vehicle is less than or equal to the parking wheel speed threshold
  • the accelerator pedal opening of the vehicle is less than or equal to The opening threshold is used to determine that the running state of the vehicle satisfies the parking condition.
  • the processing unit can also be used to:
  • the second position is located on a side of the first position away from the first end of the piston.
  • the present application also provides a vehicle.
  • the vehicle may include wheels and a braking system in any of the aforementioned possible technical solutions.
  • the braking system is connected to the wheels in transmission so as to apply braking force to the wheels so that the vehicle can achieve Parking brake or release brake.
  • the structure of the brake system of the vehicle is relatively simple, and the NVH performance of the vehicle is also improved.
  • FIG. 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application.
  • Fig. 2 is a partial structural schematic diagram of the braking system provided by the embodiment of the present application.
  • Fig. 3 is a schematic structural diagram of the brake device provided by the embodiment of the present application.
  • Fig. 4 is a schematic diagram of the working conditions of the braking system provided by the embodiment of the present application.
  • FIG. 5 is a flow chart of a control method of a braking system provided by an embodiment of the present application.
  • Fig. 6 is the specific flowchart of step 101 shown in Fig. 5;
  • FIG. 7 is a specific flowchart of step 102 shown in FIG. 5;
  • FIG. 8 is a specific flowchart of step 103 shown in FIG. 5;
  • FIG. 9 is a schematic structural diagram of a brake system control device provided by an embodiment of the present application.
  • 313-pedal feeling simulator 314-oil pot; 315-travel sensor; 321-second controller; 322-three-phase motor;
  • 323-electric cylinder 324-motor position sensor; 40-brake pedal; 1100-computing equipment; 1110-processor;
  • FIG. 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application.
  • a vehicle 1 may include a powertrain system 100 , a braking system 200 and wheels 300 .
  • the powertrain system 100 can be connected in transmission with the wheels 300 to provide driving force to the wheels 300 to drive the vehicle 1 to run.
  • the braking system 200 may include a braking device, a parking device and a brake, wherein the brakes may be provided in one-to-one correspondence with the wheels 300, and each brake may be provided on a corresponding wheel.
  • the braking device can be respectively connected with the brakes at each wheel 300 , and the brakes can provide braking force to the wheels 300 so as to stop the running vehicle 1 .
  • the parking devices can also be arranged in one-to-one correspondence with the wheels 300, and each parking device can be connected with the brake transmission at the corresponding wheel 300, and the brake 300 can provide a parking force to the wheels to avoid the vehicle 1 that is parked from slipping. Phenomenon.
  • the vehicle 1 can be a fuel vehicle.
  • the powertrain system 100 can specifically include components such as an engine, a speed reducer, and a transmission.
  • the driving force output by the engine can be transmitted to the speed reducer. After the torque acts, it is transmitted to the transmission, and then the transmission is shifted according to the gear setting of the vehicle 1 and then output to the wheels 300 to drive the vehicle 1 to travel.
  • the vehicle 1 can also be an electric vehicle.
  • the powertrain system 100 can specifically include a motor and a reducer, and the driving force output by the motor can be transmitted to the reducer. Then output to the wheel 300 to drive the vehicle 1 to travel.
  • FIG. 2 is a schematic diagram of a partial structure of a braking system provided by an embodiment of the present application.
  • the brake 10 may include a brake cylinder 11 , a brake caliper 12 and a brake disc (not shown in the figure).
  • the brake cylinder may include a cylinder body 111 and a piston 112 , the piston 112 is movably disposed in the cylinder body 111 , and the piston 112 is disposed in contact with the inner wall of the cylinder body 111 .
  • one end of the cylinder body 111 can be a closed end, and the other end can be an open end, and the first end 1121 of the piston 112 can be arranged toward the closed end of the cylinder body 111, and forms a gap with the closed end of the cylinder body 111.
  • the second end 1122 of the piston 112 can protrude to the outside of the brake cylinder 11 through the open end of the cylinder body 111 .
  • the brake caliper 12 is connected to the second end 1122 of the piston 112 , the brake disc can be disposed in the clamping space 121 of the brake caliper 12 , and the brake disc is fixedly connected to the wheel.
  • the second end 1122 of the piston 112 can drive the brake caliper 12 to clamp or loosen the brake disc, so that when the brake caliper 12 clamps the brake disc,
  • the brake disc applies braking force to realize braking or parking braking of the vehicle, and release the brake of the vehicle when the brake caliper 12 releases the brake disc.
  • the brake caliper 12 may include two friction blocks 122 arranged oppositely, and the two friction blocks 122 may be respectively arranged on two sides of the brake disc.
  • the two friction blocks 122 are connected by a connecting piece, and the two friction blocks 122 can move toward or away from each other under the action of an external force. It can be understood that the gap between the two friction blocks 122 is the brake caliper.
  • the clamping space 121 is the clamping space 121.
  • the relationship between the moving direction of the piston 112 and the working state of the brake caliper 12 can be specifically as follows: when the piston 112 moves away from the closed end of the cylinder 111, the two sides of the brake caliper 12 The friction blocks 122 move toward each other, that is, the clamping space 121 of the brake caliper 12 is reduced, so that the brake caliper 12 can clamp the brake disc when the piston 112 moves to a certain position; When the direction moves, the two friction blocks 122 of the brake caliper 12 move away from each other, that is, the clamping space 121 of the brake caliper 12 increases, and the brake caliper 12 can release the brake disc at this time.
  • the parking device 20 may include a motor 21 and a transmission assembly, the motor 21 is located outside the brake cylinder, the transmission assembly is directly connected to the output shaft of the motor 21, and the transmission assembly may be at least partially located in the brake cylinder 11 .
  • the transmission assembly can be a structure capable of changing rotational motion into linear motion, so that when the output shaft of the motor 21 rotates, it can drive the part of the transmission assembly located in the brake cylinder 11 to move.
  • the transmission assembly may include a screw 22 and a nut 23 , wherein one end of the screw 22 is directly connected to the output shaft of the motor 21 , and the other end can extend into the sealed chamber 1111 of the cylinder 111 .
  • the closed end of the cylinder body 111 may be provided with a through hole, and the screw rod 22 may extend into the sealed cavity 1111 through the through hole.
  • the nut 23 is disposed in the sealing cavity 1111 , and the nut 23 is mounted on the screw rod 22 , that is, the nut 23 and the screw rod 22 are screwed together.
  • the motor 21 drives the screw rod 22 to rotate
  • the nut 23 installed on the screw rod 22 can move along the axial direction of the screw rod 22 .
  • the axial direction of the screw rod 22 may be consistent with the length direction of the cylinder body 111 , so that the movement direction of the nut 23 in the cylinder body 111 is consistent with the movement direction of the piston 112 .
  • the moving direction of the nut 23 is determined by the direction of rotation of the motor 21, and the nut 23 can be moved to the right or left by controlling the forward and reverse rotation of the motor 21, and the rightward movement here means moving away from the cylinder body.
  • the direction of the closed end of the cylinder 111 moves, and the movement to the left is moving towards the direction close to the closed end of the cylinder 111 .
  • it can be set that when the motor 21 rotates forward, the nut 23 moves to the right, and when the motor 21 rotates reversely, the nut 23 moves to the left.
  • the nut 23 can be installed on the end of the screw rod 22.
  • the nut 23 can be a cap-shaped structure with one end closed, so that after the nut 23 is installed on the screw rod 22, the closed end of the nut 23 can be Always protrudes beyond the end of the screw 22 .
  • the first end 1121 of the piston 112 may be provided with an opening 1123 , and the end of the screw 22 may extend into the opening 1123 , and the nut 23 is also located in the opening 1123 .
  • the brake device may specifically control the action of the brake 10 in a hydraulically driven manner.
  • the braking device can be connected with the sealing chamber 1111 of the brake cylinder 11 , and the piston 112 is driven to move left and right by controlling the oil flow flowing into the sealing chamber 1111 , and the piston 112 controls the working state of the brake caliper 12 .
  • the hydraulic pressure in the sealing chamber 1111 increases, and the piston 112 can move to the right, thereby driving the brake caliper 12 to clamp the brake.
  • the hydraulic pressure in the sealing chamber 1111 decreases, and the piston 112 can move to the left, thereby releasing the braking force. Braking force applied by the disc.
  • Fig. 3 is a schematic structural diagram of a braking device provided by an embodiment of the present application.
  • the brake device 30 may include two sets of hydraulic devices, namely a first hydraulic device 31 and a second hydraulic device 32 .
  • the first hydraulic device 31 may specifically be an intelligent braking system (intelligent braking system, IBS), and the second hydraulic device 32 may specifically be a redundant brake unit (redundant brake unit, RBU).
  • the first hydraulic device 31 and the second hydraulic device 32 are respectively connected to the brake cylinders of the brakes, and the two can cooperate to control the work of the brakes to improve the control accuracy of the pressure in the brake cylinders, and the other two can also independently control the work of the brakes. That is, the first hydraulic device 31 and the second hydraulic device 32 can be redundant with each other, so that even if one of the hydraulic devices fails, the brake device 30 as a whole can continue to operate normally, thereby improving the reliability of the brake device 30 sex.
  • the first hydraulic device 31 may include a first controller 311, a master cylinder 312, a pedal feeling simulator 313, an oil pot 314, a stroke sensor 315, a liquid level sensor, a solenoid valve, a one-way valve and a brake pipeline etc.
  • the second hydraulic device 32 may include a second controller 321, a three-phase motor 322, an electric cylinder 323, a motor position sensor 324, a solenoid valve, a one-way valve, a pressure sensor, and a brake pipeline.
  • the braking device may at least include various solenoid valve drives, motor drives, and various signal processing and control output interfaces.
  • the first controller 311 and the second controller 321 can receive the measurement or detection signals of various sensors, such as environmental conditions, driver input, braking system status and other information, and control the braking of the braking device 30 through calculation and judgment. characteristic.
  • the first controller 311 can control solenoid valve a and solenoid valve b to open, and control solenoid valve c and solenoid valve d to close, and the brake pedal 40 pushes the master cylinder 312
  • the oil in the valve flows into the pedal feeling simulator 313 through the solenoid valve b, and the first controller 311 collects the signal of the stroke sensor 315, the signal of the pressure sensor at the master cylinder 312 and the liquid level signal of the oil pot 314, and transmits them to the second controller 321 .
  • the second controller 321 determines the driver's braking intention according to the stroke sensor 315 signal transmitted by the first controller 311 and the pressure sensor signal at the master cylinder 312, and controls the three-phase motor 322 to push the piston in the electric cylinder 323 to move to the right , and control solenoid valve e, solenoid valve f, solenoid valve g, solenoid valve h, solenoid valve i, solenoid valve j, solenoid valve k, solenoid valve l to open, a part of the oil in the right chamber of electric cylinder 323 is divided into two circuits, One way of oil flows into the brake cylinders at two of the wheels (ie, the front left (FL) wheel and the rear right (RR) wheel) through the opened solenoid valve e, solenoid valve f and solenoid valve g, and the other All the oil flows into the brake cylinders at the other two wheels (rear left (RL) wheel and front right (FR) wheel) through the opened solenoid valve h
  • the second controller 321 can control the solenoid valve connected to the electric cylinder and the master cylinder at the brake cylinder (that is, the above-mentioned solenoid valve f, One of solenoid valve g, solenoid valve i, solenoid valve j) is closed, and controls the solenoid valve connected to the oil pot 314 at the brake cylinder (solenoid valve m, solenoid valve n, solenoid valve o, solenoid valve p One of them) is opened, so that the oil in the brake cylinder flows into the oil pot 314 to realize decompression.
  • solenoid valve connected to the electric cylinder and the master cylinder at the brake cylinder that is, the above-mentioned valve f, One of solenoid valve g, solenoid valve i, solenoid valve j
  • solenoid valve connected to the oil pot 314 at the brake cylinder solenoid valve m, solenoid valve n, solenoid valve o, solenoid valve p One of them
  • the solenoid valve f can be closed, the oil passage between the right chamber of the electric cylinder 323 and the brake cylinder at the wheel FL can be cut off, and the solenoid valve m can be opened. , so that the oil in the brake cylinder at the wheel FL flows into the oil pot through the solenoid valve m.
  • the first controller 311 can control the solenoid valve a, solenoid valve b, solenoid valve c and solenoid valve d to open, and the oil in the master cylinder 312
  • One part flows into the brake cylinder at two wheels (ie, FL wheel and RR wheel) through the opened solenoid valve c, solenoid valve f and solenoid valve g, and the other part flows through the opened solenoid valve d, solenoid valve i and solenoid valve j It flows into the brake cylinders at the other two wheels (ie, RL wheels and FR wheels), thereby achieving braking of four wheels.
  • the first controller 311 can collect the signal of the travel sensor 315 and the liquid level signal of the oil pot 314, and transmit it to the second controller through the signal interface. device 312.
  • the second controller 312 controls the three-phase motor 322 to push the piston in the electric cylinder 323 to move to the right according to the stroke sensor 315 signal transmitted by the first controller 311, and controls the solenoid valve e, solenoid valve f, solenoid valve g, solenoid valve h.
  • Solenoid valve i, solenoid valve j, solenoid valve k, solenoid valve l are opened, a part of the oil in the right chamber of the electric cylinder 323 is divided into two paths, and one path of oil passes through the opened solenoid valve e, solenoid valve f and solenoid valve g It flows into the brake cylinders at two of the wheels (ie, FL wheels and RR wheels), and the other oil flows into the other two wheels (ie, RL wheels and FR wheels) through the opened solenoid valve h, solenoid valves i and solenoid valves j The brake cylinder at the place, so as to realize the braking of the four wheels; another part of the oil in the right chamber of the electric cylinder 323 flows into the left chamber of the electric cylinder 323 through the opened solenoid valve k and solenoid valve l.
  • the braking system 200 can also include a control unit, which can be electrically connected to the braking device 30 and the parking device 20 respectively.
  • the control unit can be used to obtain The parking signal of the vehicle, and then control the brake device 30 to drive the piston 112 to move according to the parking signal, so as to apply braking force to the brake disc, and when the second end 1122 of the piston 112 moves to the first position, control the motor 21 Drive the screw rod 22 to rotate to drive the nut 23 to move through the screw rod 22, so that the nut 23 abuts against the first end 1121 of the piston 112, that is, the closed end of the nut 23 abuts against the bottom of the opening of the piston 1123, thereby the piston 112 is fixed at the current position, and then the brake caliper 12 is kept in the working state of clamping the brake disc to realize the parking brake of the vehicle.
  • control unit can also be used to obtain the hydraulic pressure in the brake cylinder 11 (that is, the hydraulic pressure in the sealed cavity 1111), and when it is determined that the hydraulic pressure in the brake cylinder 11 is not less than the target hydraulic pressure, control the first position of the piston 112.
  • the two ends 1122 move to the first position. That is to say, when the braking system in the present application is performing parking braking, the braking device 30 is firstly used to generate a corresponding target hydraulic pressure to push the piston 112 to move, so that the brake caliper 12 clamps the brake disc, and then The motor 21 is controlled to drive the nut 23 to move, so that the nut 23 pushes to a position where it abuts against the piston 112 .
  • the torque output by the motor 21 of the parking device 20 is relatively small when parking, so the power requirement for the motor 21 is also small, so that the cost of the motor 21 can be reduced on the one hand, and on the other hand
  • the deceleration mechanism used for torque boosting can be omitted, so that the structure of the parking device 20 can be simplified, and the overall NVH performance of the vehicle can be improved.
  • the control unit can control the motor 21 to stop working, and then control the braking device 30 to stop applying the braking force to the brake disc. That is, the first hydraulic device 31 and the second hydraulic device 32 are controlled to withdraw from pressure build-up. At this time, the brake caliper 12 can clamp the brake disc completely by the abutment effect of the nut 23 .
  • control unit can also be used to: when it is determined that the first hydraulic device 31 fails, control the second hydraulic device 32 to drive the piston to move; similarly, when it is determined that the second hydraulic device 32 fails, control The first hydraulic device 31 drives the piston to move; and, when it is determined that neither the first hydraulic device 31 nor the second hydraulic device 32 fails, control the first hydraulic device 31 and the second hydraulic device 32 to jointly drive the piston to move .
  • the first hydraulic device 31 and the second hydraulic device 32 can be mutually redundant. When one of the hydraulic devices fails, the other can continue to work, thereby ensuring that the vehicle completes the entire parking action and meets the requirements of the vehicle operation. Functional safety requirements.
  • control unit can also be used to: acquire the running state of the vehicle, determine the parking mode of the vehicle according to the running state of the vehicle, and then determine the target hydraulic pressure according to the parking mode.
  • target hydraulic pressure of the vehicle determines the position of the second end of the piston, and further determines the force on the brake disc when the vehicle is kept in a parked state.
  • the target hydraulic pressure of the vehicle is related to the running state of the vehicle. For example, whether there is an external request for the vehicle, and information such as the vehicle speed and wheel speed directly affect the target parking force.
  • the control unit can also be used to: determine whether there is an external request for the vehicle; if it is determined that there is no external request for the vehicle and the running state of the vehicle meets the parking conditions, determine that the vehicle is in the first parking mode, At this time, the first parking force can be determined according to the vehicle parameters, and the first parking force is the target hydraulic pressure; or, if it is determined that the vehicle has an external request and the running state of the vehicle does not meet the parking conditions, it is determined that the vehicle is the first hydraulic pressure.
  • the second parking force can be determined according to the external request, and the second parking force is the target hydraulic pressure; or, if it is determined that the vehicle has an external request and the operating conditions of the vehicle meet the parking conditions, It is determined that the vehicle is in the third parking mode.
  • the first parking force may be used as the target hydraulic pressure, or the larger value of the first parking force and the second parking force may be used as the target hydraulic pressure.
  • the external request of the vehicle includes, but is not limited to, that the vehicle is in an intelligent driving mode, an anti-lock brake mode, or a driving assistance mode, and the like.
  • the parking conditions of the vehicle include whether the vehicle receives a parking command and whether the vehicle speed, wheel speed, and opening of the accelerator pedal meet the requirements.
  • the vehicle parameters may include one or more of the slope of the road where the vehicle is located, the mass of the vehicle, whether the vehicle is attached with a trailer, and whether the temperature of the brake disc is greater than or equal to a temperature threshold.
  • the control unit can also be used to: when it is determined that the vehicle has received a parking command, according to the vehicle speed of the vehicle is less than or equal to the parking speed threshold, the wheel speed of the vehicle is less than or equal to the parking wheel speed The speed threshold, the wheel speed of the vehicle is less than or equal to the parking wheel speed threshold, the accelerator pedal opening of the vehicle is less than or equal to the opening threshold, etc., to determine that the running state of the vehicle meets the parking conditions.
  • the parking command can be specifically issued by the driver, and the cockpit of the vehicle can be provided with a parking control button, which can be electrically connected to the control unit, and the driver can issue a parking command by activating the parking control button. Park command.
  • the vehicle speed and the wheel speed meet the threshold requirement.
  • the vehicle speed is equal to the wheel speed.
  • the wheel speed can also meet the corresponding threshold requirements. However, if the wheels move, The speed of the vehicle and the speed of the wheels are no longer equal.
  • parameter values such as the parking vehicle speed threshold, the parking wheel speed threshold, and the opening of the accelerator pedal can be determined through experiments, or can also be obtained through experience, which is not specifically limited in the present application.
  • control unit can also be used to identify whether the vehicle is in a rolling state based on information such as the vehicle's wheel speed and driving direction, and control the braking when it is determined that the vehicle is in a rolling state
  • the device 30 drives the piston to move to apply a braking force to the brake disc, so that the vehicle returns to a stationary state from a rolling state.
  • the control unit can control the motor 21 to drive the screw 22 to rotate, so that the nut 23 also moves to abut against the first end 1121 of the piston 112 again, so as to fix the piston 112 In the position after the shift, parking braking of the vehicle is effected again. It can be understood that, compared with the first parking brake, the position of the piston 112 will shift to the right to a certain extent, that is, the above-mentioned second position is located on the side of the first position away from the nut.
  • the control unit can control the brake device 30 to continue to drive the piston 112 to move, so that the second end 1122 of the piston 112 moves to the third position, and the third position is located at the distance from the nut 23 of the first position.
  • One side of the first position that is, the right side of the first position, so that a certain gap is formed between the nut 23 and the first end 1121 of the piston 112, thereby releasing the load of the motor 21, so that the motor 21 can rotate forward or reverse smoothly.
  • the control unit can control the reverse rotation of the motor 21, so that the nut 23 returns to the initial position, and finally control the brake device 30 to stop building pressure, so that the vehicle releases the parking brake.
  • the third position to which the second end of the piston 112 is moved by the brake device 30 should be located at the second position right side, to ensure that a gap can be formed between the nut 23 and the first end 1121 of the piston 112 .
  • Fig. 4 is a schematic diagram of working conditions of the braking system provided by the embodiment of the present application.
  • the braking device 30 drives the piston 112 to move to the right, and the piston 112 drives the brake caliper 12 to gradually clamp the brake. disc, the hydraulic pressure in the sealed cavity 1111 gradually increases, and the driver can activate the parking control button during this process.
  • the hydraulic pressure of the sealing chamber 1111 increases to equal to the target hydraulic pressure, the motor 21 starts, and the rotational speed of the motor 21 can first increase and then decrease to drive the nut 23 to move to the right.
  • the braking device 30 drives the piston 112 to move to the right again until the second end 1122 of the piston 112 moves to the second position, so that the vehicle returns to a stationary state from the rolling state. state.
  • the motor 21 is started to drive the nut 23 to move to the position abutting against the piston 112 again, so as to realize the parking brake of the vehicle again.
  • the motor 21 stops working, the braking device 30 withdraws from the pressure build-up, and the hydraulic pressure in the sealing chamber 1111 gradually decreases to zero.
  • the clamping force on the brake disc will increase correspondingly and finally maintain a constant value.
  • An embodiment of the present application also provides a method for controlling a braking system, wherein the structure of the braking system may refer to the description in the preceding embodiments, and details are not repeated here.
  • the control method may include the following steps:
  • the motor-driven transmission assembly that controls the parking device moves to a position where it abuts against the first end of the piston.
  • control method may also include:
  • the second end of the control piston moves to the first position. It can be understood that the first position is the position where the second end of the piston is when the brake caliper clamps the brake disc to stop the rotation of the brake disc.
  • the braking device when performing parking braking, the braking device is first used to generate a corresponding braking force, so that the brake caliper clamps the brake disc, and then the motor is controlled to drive the nut to move. Push the nut up against the piston.
  • the torque output by the motor of the parking device is small when parking, so the power requirement for the motor is also small.
  • the cost of the motor can be reduced, and on the other hand, it can also be used in the parking device.
  • the deceleration mechanism used for torque boosting is omitted, which not only simplifies the structure of the parking device, but also improves the overall NVH performance of the vehicle.
  • control method of the braking system may further include:
  • the first hydraulic device and the second hydraulic device are controlled to drive the piston to move.
  • the first hydraulic device and the second hydraulic device can be mutually redundant.
  • the other can continue to work, thereby ensuring that the vehicle completes the entire parking action and meets the functional safety of the vehicle operation. need.
  • the parking mode of the vehicle can be judged according to the running state of the vehicle, and then the target hydraulic pressure can be calculated according to the determined parking mode. And, after the vehicle completes the parking brake, it is still possible for the vehicle to roll under the influence of the external environment or the action of an external force.
  • the above control method may also include the step of a safety mode control strategy, so that the rolling occurs The car's vehicle is parked again. Based on this, please refer to FIG. 5 , the method for controlling the braking system provided by the embodiment of the present application may specifically include the following steps:
  • Step S101 judging the parking mode
  • Step S102 determining the target hydraulic pressure according to the parking mode of the vehicle
  • Step S103 normal control mode, including controlling the braking device to drive the piston to move, and controlling the motor to drive the transmission assembly to move;
  • Step S104 when the vehicle is in a rolling state, control the brake system to enter a control strategy of a safe mode.
  • FIG. 6 is a specific flowchart of step 101 shown in FIG. 5 .
  • step S101 may specifically include:
  • Step S1011 if it is determined that there is no external request for the vehicle and the running state of the vehicle satisfies the parking condition, determine that the vehicle is in the first parking mode;
  • Step S1012 if it is determined that the vehicle has an external request and the running state of the vehicle does not meet the parking condition, determine that the vehicle is in the second parking mode;
  • Step S1013 if it is determined that the vehicle has an external request, and the running state of the vehicle satisfies the parking condition, determine that the vehicle is in the third parking mode.
  • the external request of the vehicle includes, but is not limited to, that the vehicle is in an intelligent driving mode, an anti-lock brake mode, or a driving assistance mode, and the like.
  • the parking conditions of the vehicle include whether the vehicle receives a parking command and whether the vehicle speed, wheel speed, and opening of the accelerator pedal meet the requirements.
  • determining that the running state of the vehicle meets the parking condition may specifically include:
  • the vehicle's wheel speed is less than or equal to the parking wheel speed threshold
  • the vehicle's wheel speed is less than or equal to the parking wheel speed threshold
  • the vehicle's accelerator pedal The opening degree is less than or equal to the opening degree threshold and other information.
  • the parking condition is not met. For example, if the vehicle does not receive a parking command, the following three conditions (vehicle speed, wheel speed and accelerator pedal opening) do not need to be judged, that is, it is determined that the running state of the vehicle does not meet the parking condition. When it is determined that the vehicle has received a parking instruction, and the vehicle speed is not less than or equal to the parking speed threshold, then the other two conditions (wheel speed and accelerator pedal opening) do not need to be judged, that is, it is determined that the running state of the vehicle is not Meet the parking conditions, and so on.
  • vehicle speed wheel speed and accelerator pedal opening
  • FIG. 7 is a specific flowchart of step S102 shown in FIG. 5 .
  • step 102 may specifically include:
  • Step S1021 when the vehicle is in the first parking mode, determine the first parking force according to the vehicle parameters, and the first parking force is the target hydraulic pressure;
  • Step S1022 when the vehicle is in the second parking mode, determine the second parking force according to the external request, and the second parking force is the target hydraulic pressure;
  • Step S1023 when the vehicle is in the third parking mode, the first parking force may be determined as the target hydraulic pressure, or the larger of the first parking force or the second parking force may be determined as the target hydraulic pressure.
  • the vehicle parameters may include one or more of the slope of the road where the vehicle is located, the mass of the vehicle, whether the vehicle is attached with a trailer, and whether the temperature of the brake disc is greater than or equal to a temperature threshold.
  • FIG. 8 is a specific flowchart of step S103 shown in FIG. 5 .
  • step S103 may specifically include:
  • Step S1031 controlling the braking device to drive the piston to move
  • Step S1032 judging whether the second end of the piston has moved to the first position, if yes, execute step S1033, if not, return to execute step S1031;
  • Step S1033 controlling the motor to drive the transmission assembly to move in a direction close to the first end of the piston;
  • Step S1034 judging whether the transmission assembly is in contact with the first end of the piston, if yes, execute step S1035, if not, return to execute step 1033;
  • Step S1035 end control.
  • step S104 may specifically include:
  • control the brake device to drive the piston to move to the second position.
  • the second position is located at the first position away from the nut.
  • One side of the brake caliper will clamp the brake disc again under the push of the piston, and then the vehicle will return to a stationary state from a rolling state.
  • the motor is controlled to drive the screw to rotate, and the screw drives the nut to move to a position where it abuts against the first end of the piston, so as to realize parking braking of the vehicle again.
  • the embodiment of the present application also provides a computing device 1100 .
  • the computing device 1100 may be a chip or a system on a chip.
  • the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.
  • the computing device 1100 may include at least one processor 1110, and the processor 1110 is coupled with a memory.
  • the memory may be located within the device, the memory may be integrated with the processor, or the memory may be located outside the device.
  • Computing device 1100 may also include at least one memory 1120 , for example.
  • the memory 1120 stores necessary computer programs, configuration information, computer programs or instructions and/or data for implementing any of the above embodiments; the processor 1110 can execute the computer programs stored in the memory 1120 to complete the method in any of the above embodiments.
  • the computing device 1100 may further include a communication interface 1130, and the computing device 1100 may perform information exchange with other devices through the communication interface 1130.
  • the communication interface 1130 may be a transceiver, a circuit, a bus, a module, a pin or other types of communication interfaces.
  • the communication interface 1130 in the device 1100 can also be an input and output circuit, which can input information (or call, receive information) and output information (or call, send information)
  • the processor is an integrated processor or a microprocessor or an integrated circuit or a logic circuit, and the processor can determine output information according to input information.
  • the coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processor 1110 may cooperate with the memory 1120 and the communication interface 1130 .
  • a specific connection medium among the processor 1110, the memory 1120, and the communication interface 1130 is not limited.
  • the bus 1140 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus or the like.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 9 , but it does not mean that there is only one bus or one type of bus.
  • the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or Various methods, steps, and logic block diagrams for executing the application embodiments in the embodiments of the present application.
  • a general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method in the embodiments of the application in combination with the embodiments of the present application may be directly implemented by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the memory may be a non-volatile memory, such as a hard disk (hard disk drive, HDD) or a solid-state drive (solid-state drive, SSD), etc., and may also be a volatile memory (volatile memory), such as Random-access memory (RAM).
  • a memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • the memory in the embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, and is used for storing program instructions and/or data.
  • the computing device 1100 can be applied to the sending end, and the specific computing device 1100 can be the sending end, or can be a device capable of supporting the sending end and realizing the function of the sending end in any of the above-mentioned embodiments .
  • the memory 1120 stores necessary computer programs, computer programs or instructions and/or data for realizing the functions of the sending end in any of the above-mentioned embodiments.
  • the processor 1110 may execute the computer program stored in the memory 1120 to complete the method performed by the sending end in any of the foregoing embodiments.
  • the communication interface in the computing device 1100 can be used to interact with the receiving end, such as sending information to the receiving end.
  • the computing device 1100 can be applied to the receiving end, and the specific computing device 1100 can be the receiving end, or it can support the receiving end to realize the functions of the receiving end in any of the above-mentioned embodiments. device.
  • the memory 1120 stores necessary computer programs, computer programs or instructions and/or data for realizing the functions of the receiver in any of the above-mentioned embodiments.
  • the processor 1110 may execute the computer program stored in the memory 1120 to complete the method executed by the receiving end in any of the foregoing embodiments.
  • the communication interface in the computing device 1100 can be used to interact with the sending end, such as receiving information from the sending end.
  • the computing device 1100 provided in this embodiment can be applied to a sending end to complete the method executed by the sending end, or applied to a receiving end to complete the method executed by the receiving end. Therefore, the technical effects that can be obtained can refer to the above-mentioned method embodiments, and will not be repeated here.
  • an embodiment of the present application further provides a computer program that, when the computer program is run on a computer, enables the computer to implement the method provided in any one of the embodiments shown in FIG. 5 to FIG. 8 .
  • this embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a computer, the computer can realize the steps shown in FIG. 5 to FIG. 8 .
  • the storage medium may be any available medium that can be accessed by a computer.
  • Computer-readable media may include RAM, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), CD- ROM or other optical disk storage, magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • the technical solutions provided by the embodiments of the present application may be fully or partially implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer may be a general computer, a special computer, a computer network, an access network device, a terminal device or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD)), or a semiconductor medium.

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  • Mechanical Engineering (AREA)
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  • Regulating Braking Force (AREA)

Abstract

一种制动系统(200),包括制动缸(11)、制动装置(30)、驻车装置(20)及控制单元,其中:制动缸(11)包括活塞(112),活塞(112)的第一端(1121)位于制动缸(11)内,活塞(112)的第二端(1122)伸出制动缸(11);制动装置(30)与制动缸(11)连接,用于驱动活塞(112)移动;驻车装置(20)包括电机(21)和传动组件,电机(21)与传动组件直接连接,传动组件至少部分位于制动缸(11)内,电机(21)用于驱动传动组件在制动缸(11)内移动,以使传动组件与活塞(112)的第一端(1121)接触或分离。还公开了车辆(1)及制动系统(200)的控制方法,以简化制动系统(200)的结构,并提高车辆(1)的NVH性能。

Description

一种制动系统、车辆及制动系统的控制方法 技术领域
本申请涉及车辆技术领域,尤其涉及一种制动系统、车辆及制动系统的控制方法。
背景技术
车辆在停驶时,为了避免出现溜车的情况,通常会进行驻车制动。驻车制动的方式一般包括手刹和电子驻车(electrical park brake,EPB)。传统的手刹为拉索式,用户可通过拉动手刹杆向驻车装置传递驻车力,手刹杆的拉起程度决定驻车力的大小。电子驻车相较于传统手刹,操作方式变为按动按钮开关,通过按下、抬起按钮向电子驻车装置的控制单元发出指令,由控制单元控制制动钳向制动盘施加驻车力,实现驻车制动。
一些电子驻车装置一般都设置有减速机构,在执行驻车制动时,电机输出的动力需要经过减速机构进行减速增矩后再传递给制动钳,使制动钳夹紧制动盘;同样,在解除驻车制动时,电机反转输出的动力也要经过减速机构再传递给制动钳,使制动钳松开制动盘。由于减速机构的存在,导致电子驻车装置的结构较为复杂,尺寸较大,并且在驻车或者解除驻车的过程中噪声较为明显,影响车辆的噪声、振动与声振粗糙度(noise、vibration、harshness,NVH)性能。
发明内容
本申请提供了一种制动系统、车辆及制动系统的控制方法,在实现可靠驻车的前提下,简化了制动系统的结构,并提高了车辆的NVH性能。
第一方面,本申请提供了一种制动系统,该制动系统可包括制动缸、制动装置和驻车装置。其中,制动缸可包括活塞,活塞移动设置在缸体内,活塞的第一端可位于制动缸内部,活塞的第二端可伸出至制动缸的外部。制动装置与制动缸连接,制动装置可驱动活塞移动。驻车装置可包括电机和传动组件,电机的输出轴可与传动组件直接连接,传动组件至少部分设置于制动缸内,电机可用于驱动传动组件在制动缸内移动,以使传动组件能够与活塞的第一端接触或分离。
上述方案中,制动系统在进行驻车时通过制动装置的助力,使得驻车装置的电机输出的力矩较小,因此对电机的功率要求也较小,这样一方面可以降低电机的成本,另一方面也可以在驻车装置中省略掉用于增矩的减速机构,从而既可以简化驻车装置的结构,又可以提升车辆整体的NVH性能。
示例性地,传动组件可以包括螺杆和螺母,电机的输出轴可与螺杆直接连接,螺杆可伸入制动缸内,螺母则位于制动缸内,且螺母与螺杆之间螺纹联接。这样,当电机驱动螺杆转动,螺杆就可带动螺母移动,使螺母与活塞的第一端接触或分离。
具体设置时,螺杆的轴向可以与缸体的长度方向一致,从而使得螺母在缸体内的移动方向与活塞的移动方向也保持一致,这样螺母在抵接到活塞的第一端时,螺母施加给活塞的作用力的方向与活塞的移动方向同向,从而可以减小活塞卡滞的风险。
另外,螺母的第一端可以设置有开孔,螺杆的端部可伸入至开孔内,螺母安装于螺杆的端部,因此螺母也位于开孔内。当电机驱动螺杆转动,以带动螺母移动时,螺母可以抵 接到开孔的底部,以便于向活塞施加远离电机的方向的作用力。
在一些可能的实施方案中,制动系统还可以包括制动钳和制动盘,制动钳与活塞的第二端连接,制动盘则可设置于制动钳的夹持空间内,从而使活塞移动时能够带动制动钳夹紧或松开制动盘。
在一些可能的实施方案中,制动钳可包括相对设置的两个摩擦块,两个摩擦块可分别设置于制动盘的两侧,两个摩擦块之间传动连接,并且可以在外力的作用下相向或者相背移动,从而改变制动钳的夹持空间的大小。
在一些可能的实施方案中,制动系统还可以包括控制单元,控制单元可用于:获取驻车信号,根据驻车信号控制制动装置驱动活塞移动;在活塞移动至第一位置时,控制电机驱动传动组件移动至与活塞的第一端抵接的位置。
在一些可能的实施方案中,控制单元还可用于:获取制动缸的液压力,当制动缸内的液压力不小于目标液压力时,控制活塞的第二端移动至第一位置。可以理解的,该第一位置即为制动钳夹紧制动盘以使制动盘停止转动时,活塞的第二端所在的位置。
在一些可能的实施方案中,制动装置可以包括第一液压装置和第二液压装置,第一液压装置和第二液压装置可分别与制动缸连接。控制单元还可用于:在第一液压装置发生故障时,控制第二液压装置驱动活塞移动;或者,在第二液压装置发生故障时,控制第一液压装置驱动活塞移动;或者,在第一液压装置和第二液压装置均未发生故障时,控制第一液压装置和第二液压装置共同驱动活塞移动。也就是说,第一液压装置与第二液压装置既可以协同作业,也可以互为冗余,这样即使其中一个液压装置发生故障,也可以保证制动装置整体能够继续正常运行,从而提高制动装置的可靠性。
在一些可能的实施方案中,控制单元还可用于:获取车辆的运行状态,根据车辆的运行状态确定车辆的驻车模式,并根据驻车模式确定目标液压力。采用这种设计,根据车辆的运行状态可以更加准确地确定目标液压力,从而使车辆能够可靠地进行驻车制动。
在确定车辆的驻车模式时,控制单元还可用于:在车辆不存在外部请求,且车辆的运行状态满足驻车条件时,确定第一驻车模式,此时可根据车辆参数确定第一驻车力,该第一驻车力即为目标液压力;或者,在车辆存在外部请求,且车辆的运行状态不满足驻车条件时,确定第二驻车模式,此时可根据外部请求确定第二驻车力,该第二驻车力即为目标液压力;或者,在车辆存在外部请求,且车辆的运行条件满足驻车条件时,确定第三驻车模式,此时可以第一驻车力为目标驻车力,或者以第一驻车力与第二驻车力中的较大值为目标液压力。
其中,车辆的外部请求包括但不限于为车辆处于智能驾驶模式、制动防抱死模式或者驾驶辅助模式等等。车辆参数可包括车辆所处道路的坡度、车辆的质量、车辆是否挂有拖车或者制动盘的温度中的一项或多项。
在判断车辆的运行状态是否满足驻车条件时,控制单元还可用于:在车辆接收到驻车指令时,根据车辆的车速小于或者等于驻车车速阈值、车辆的轮速小于或者等于驻车轮速阈值、车辆的油门踏板开度小于或者等于开度阈值,确定车辆的运行状态满足驻车条件。
在一些可能的实施方案中,控制单元还可用于:在车辆处于溜车状态时,控制制动装置驱动所述活塞移动,以使车辆由溜车状态恢复为静止状态;在活塞的第二端移动至第二位置时,控制电机驱动螺杆转动,通过螺杆带动螺母移动至与活塞的第一端抵接的位置,以将活塞的位置固定,实现车辆的再次驻车制动,可以理解的,第二位置位于第一位置远 离活塞的第一端的一侧。
第二方面,本申请还提供了一种制动系统的控制方法,其中,制动系统可包括制动缸、制动装置和驻车装置。其中,制动缸可包括活塞,活塞移动设置在缸体内,活塞的第一端可位于制动缸内部,活塞的第二端可伸出至制动缸的外部。制动装置与制动缸连接,制动装置可驱动活塞移动。驻车装置可包括电机和传动组件,电机的输出轴可与传动组件直接连接,传动组件至少部分设置于制动缸内,电机可用于驱动传动组件在制动缸内移动,以使传送组件能够与活塞的第一端接触或分离。该控制方法可包括:
获取驻车信号;
根据驻车信号,控制制动装置驱动活塞移动;
在活塞的第二端移动至第一位置时,控制电机驱动传动组件移动置与活塞的第一端抵接的位置。
本申请实施例提供的制动系统的控制方法,通过制动装置的助力,在驻车时驻车装置的电机输出的力矩较小,因此对电机的功率要求也较小,一方面可以降低电机的成本,另一方面也可以在驻车装置中省略掉用于增矩作用的减速机构,从而既可以简化驻车装置的结构,又可以提升车辆整体的NVH性能。
在一些可能的实施方案中,控制方法还可包括:获取制动缸的液压力,当制动缸内的液压力不小于目标液压力时,控制活塞的第二端移动至第一位置。可以理解的,该第一位置即为制动钳夹紧制动盘以使制动盘停止转动时,活塞的第二端所在的位置。
在一些可能的实施方案中,制动装置可以包括第一液压装置和第二液压装置,第一液压装置和第二液压装置可分别与制动缸连接。控制制动装置向驱动活塞移动,具体可包括:
在第一液压装置发生故障时,控制第二液压装置驱动活塞移动;或者,在第二液压装置发生故障时,控制第一液压装置驱动活塞移动;或者,在第一液压装置和第二液压装置均未发生故障时,控制第一液压装置和第二液压装置共同驱动活塞移动。也就是说,第一液压装置与第二液压装置既可以协同作业,也可以互为冗余,这样即使其中一个液压装置发生故障,也可以保证制动装置整体能够继续正常运行,从而提高制动装置的可靠性。
在一些可能的实施方案中,上述控制方法还可以包括:
获取车辆的运行状态,根据车辆的运行状态确定车辆的驻车模式,并根据驻车模式确定目标液压力。采用这种设计,根据车辆的运行状态可以更加准确地确定目标液压力,从而使车辆能够可靠地进行驻车制动。
其中,根据车辆的运行状态确定车辆的驻车模式,并根据驻车模式确定目标液压力,具体可包括:
在车辆不存在外部请求,且车辆的运行状态满足驻车条件时,确定第一驻车模式,根据车辆参数确定第一驻车力,该第一驻车力即为目标液压力;或者,
在车辆存在外部请求,且车辆的运行状态不满足驻车条件时,确定第二驻车模式,根据外部请求确定第二驻车力,该第二驻车力即为目标液压车力;或者,
在车辆存在外部请求,且车辆的运行条件满足驻车条件时,确定第三驻车模式,此时可以第一驻车力为目标液压力,或者以第一驻车力与第二驻车力中的最大值为目标液压力。
在一些可能的实施方案中,上述控制方法还可包括:
在车辆接收到驻车指令时,根据车辆的车速小于或者等于驻车车速阈值、车辆的轮速小于或者等于驻车轮速阈值、车辆的油门踏板开度小于或者等于开度阈值,确定车辆的运 行状态满足驻车条件。
在一些可能的实施方案中,上述控制方法还可以包括:
在车辆处于溜车状态时,控制制动装置驱动所述活塞移动,以使车辆由溜车状态恢复为静止状态;
在活塞的第二端移动至第二位置时,控制电机驱动传动组件移动至与活塞的第一端抵接的位置,以将活塞的位置固定,实现车辆的再次驻车制动,其中,第二位置位于第一位置远离活塞的第一端的一侧。
第三方面,本申请还提供了一种计算设备,该计算设备括处理器,用于实现上述第二方面所描述的方法。所述计算设备还可以包括存储器,用于存储程序指令和数据。所述存储器与所述处理器耦合,所述处理器执行所述存储器中存储的程序指令时,可以实现上述第二方面描述的方法。所述通信装置还可以包括通信接口,所述通信接口用于该装置与其它设备进行通信,示例性的,通信接口可以是收发器、电路、总线、模块或其它类型的通信接口。
第四方面,本申请实施例还提供了一种计算机可读存储介质,所述计算机可读存储介质中存储有计算机程序或指令,当所述计算机程序或者指令在计算机上运行时,使得所述计算机实现上述第二方面中提供的方法。
第五方面,本申请实施例还提供了一种计算机程序,当所述计算机程序在计算机上运行时,使得所述计算机实现上述第二方面提供的方法。
第六方面,本申请还提供了一种制动系统控制装置,该制动系统控制装置可包括获取单元和处理单元,其中:
所述获取单元用于获取驻车信号;
所述处理单元用于根据所述驻车信号控制制动装置驱动制动缸的活塞移动,所述活塞具有位于所述制动缸内的第一端,以及伸出所述制动缸外的第二端;在所述活塞的第二端移动至第一位置时,控制驻车装置的电机驱动传动组件移动至与所述活塞的第一端抵接的位置,其中,所述传动组件的至少部分位于所述制动缸内。
在一些可能的实施方案中,处理单元还可用于:
获取所述制动缸内的液压力;当所述制动缸内的液压力大于或等于目标液压力时,确定所述活塞的第二端移动至所述第一位置。
在一些可能的实施方案中,处理单元具体可用于:
在第一液压装置发生故障时,控制第二液压装置驱动所述活塞移动;或者,在所述第二液压装置发生故障时,控制所述第一液压装置驱动所述活塞移动;或者,在所述第一液压装置与所述第二液压装置均未发生故障时,控制所述第一液压装置及所述第二液压装置共同驱动所述活塞移动。
在一些可能的实施方案中,获取单元还可用于获取车辆的运行状态;
处理单元还可用于:根据所述车辆的运行状态确定所述车辆的驻车模式,并根据所述驻车模式确定所述目标液压力。
在一些可能的实施方案中,处理单元还可用于:
在所述车辆不存在所述外部请求,且所述车辆的运行状态满足驻车条件时,确定第一驻车模式,根据车辆参数确定第一驻车力,所述第一驻车力为所述目标液压力;或者,
在所述车辆存在所述外部请求,且所述车辆的运行状态不满足所述驻车条件时,确定 第二驻车模式,根据所述外部请求确定第二驻车力,所述第二驻车力为所述目标液压力;或者,
在所述车辆存在所述外部请求,且所述车辆的运行条件满足所述驻车条件时,确定第三驻车模式,确定所述第一驻车力为所述目标液压力,或者确定所述第一驻车力与所述第二驻车力中的较大值为所述目标液压力。
在一些可能的实施方案中,处理单元还可用于:
在所述车辆接收到驻车指令时,根据所述车辆的车速小于或者等于驻车车速阈值、所述车辆的轮速小于或者等于驻车轮速阈值、所述车辆的油门踏板开度小于或者等于开度阈值,确定所述车辆的运行状态满足所述驻车条件。
在一些可能的实施方案中,处理单元还可用于:
在所述车辆处于溜车状态时,控制所述制动装置驱动所述活塞移动;
在所述活塞的第二端移动至所述第一位置时,控制所述传动组件移动至与所述活塞的第一端抵接的位置;
其中,所述第二位置位于所述第一位置远离所述活塞的第一端的一侧。
第七方面,本申请还提供了一种车辆,车辆可包括车轮以及前述任一可能的技术方案中的制动系统,制动系统与车轮传动连接,以便于向车轮施加制动力,使车辆实现驻车制动或解除制动。该车辆的制动系统的结构较为简单,车辆的NVH性能也得以提高。
附图说明
图1为本申请实施例提供的车辆的结构示意图;
图2为本申请实施例提供的制动系统的局部结构示意图;
图3为本申请实施例提供的制动装置的结构示意图;
图4为本申请实施例提供的制动系统的工况示意图;
图5为本申请实施例提供的制动系统的控制方法流程图;
图6为图5中所示的步骤101的具体流程图;
图7为图5中所示的步骤102的具体流程图;
图8为图5中所示的步骤103的具体流程图;
图9为本申请实施例提供的制动系统控制装置的结构示意图。
附图标记:
1-车辆;100-动力总成系统;200-制动系统;300-车轮;10-制动器;11-制动缸;
12-制动钳;111-缸体;112-活塞;1121-活塞的第一端;1122-活塞的第二端;
1111-密封腔;121-夹持空间;122-摩擦块;21-电机;22-螺杆;23-螺母;1123-开孔;
31-第一液压装置;32-第二液压装置;311-第一控制器;312-主缸;
313-踏板感觉模拟器;314-油壶;315-行程传感器;321-第二控制器;322-三相电机;
323-电缸;324-电机位置传感器;40-制动踏板;1100-计算设备;1110-处理器;
1120-存储器;1130-通信接口;1140-总线。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚,下面将结合附图对本申请作进一步 地详细描述。在本说明书中描述的参考“一个实施例”或“一些实施例”等意味着在本申请的一个或多个实施例中包括结合该实施例描述的特定特征、结构或特点。由此,在本说明书中的不同之处出现的语句“在一个实施例中”、“在一些实施例中”、“在其他一些实施例中”、“在另外一些实施例中”等不是必然都参考相同的实施例,而是意味着“一个或多个但不是所有的实施例”,除非是以其他方式另外特别强调。术语“包括”、“包含”、“具有”及它们的变形都意味着“包括但不限于”,除非是以其他方式另外特别强调。另外,本说明书中涉及的“第一”、“第二”等词汇,仅用于区分描述的目的,而不能理解为指示或暗示相对重要性,也不能理解为指示或暗示顺序。
以下实施例中所使用的术语只是为了描述特定实施例的目的,而并非旨在作为对本申请的限制。如在本申请的说明书和所附权利要求书中所使用的那样,单数表达形式“一个”、“一种”、“所述”、“上述”、“该”和“这一”旨在也包括例如“一个或多个”这种表达形式,除非其上下文中明确地有相反指示。
图1为本申请实施例提供的车辆的结构示意图。参考图1所示,车辆1可包括动力总成系统100、制动系统200以及车轮300。其中,动力总成系统100可与车轮300传动连接,以向车轮300提供驱动力,驱动车辆1行驶。制动系统200可包括制动装置、驻车装置和制动器,其中,制动器可与车轮300一一对应设置,每个制动器可设置于对应的车轮处。制动装置可分别与各个车轮300处的制动器传动连接,通过制动器向车轮300提供制动力,以使行驶中的车辆1停驶。驻车装置也可与车轮300一一对应设置,且每个驻车装置可与对应车轮300处的制动器传动连接,通过制动器300向车轮提供驻车力,以避免停驶的车辆1出现溜车现象。
在一些实施例中,车辆1可以为燃油汽车,此时,动力总成系统100具体可包括发动机、减速器以及变速器等部件,发动机输出的驱动力可传递至减速器,经过减速器的减速增矩作用后再传递至变速器,然后根据车辆1的档位设置由变速器变速后输出至车轮300,驱动车辆1行驶。
在另外一些实施例中,车辆1还可以为电动汽车,此时,动力总成系统100具体可以包括电机和减速器,电机输出的驱动力可传递至减速器,经过减速器的减速增矩作用后输出至车轮300,驱动车辆1行驶。
图2为本申请实施例提供的制动系统的局部结构示意图。参考图2所示,制动器10可以包括制动缸11、制动钳12和制动盘(图中未示出)。制动缸可包括缸体111和活塞112,活塞112可移动设置于缸体111内,且活塞112与缸体111的内壁之间接触设置。具体实施时,缸体111的一端可以为封闭端,另一端则可以为开口端,活塞112的第一端1121可朝向缸体111的封闭端设置,并与缸体111的封闭端之间形成密封腔1111,活塞112的第二端1122可通过缸体111的开口端伸出至制动缸11的外部。制动钳12与活塞112的第二端1122连接,制动盘可设置于制动钳12的夹持空间121内,且制动盘与车轮固定连接。这样,当活塞112在缸体111内移动时,活塞112的第二端1122就可带动制动钳12夹紧或者松开制动盘,从而在制动钳12夹紧制动盘时向制动盘施加制动力,以实现车辆的刹车或驻车制动,以及在制动钳12松开制动盘时使车辆解除制动。
其中,制动钳12可包括相对设置的两个摩擦块122,两个摩擦块122可分别设置于制动盘的两侧。两个摩擦块122之间通过连接件传动连接,且两个摩擦块122可在外力的作用下同时相向或者相背移动,可以理解的,两个摩擦块122之间的间隙即为制动钳的夹持 空间121。
另外,在本申请实施例中,活塞112的移动方向与制动钳12的工作状态的关系具体可以为,当活塞112朝向远离缸体111的封闭端的方向移动时,制动钳12的两个摩擦块122相向移动,也即制动钳12的夹持空间121缩小,使得制动钳12可在活塞112移动到一定位置时夹紧制动盘;当活塞112朝向靠近缸体111的封闭端的方向移动时,制动钳12的两个摩擦块122相背移动,也即制动钳12的夹持空间121增大,此时制动钳12可松开制动盘。
请继续参考图2,驻车装置20可包括电机21和传动组件,电机21位于制动缸的外部,传动组件与电机21的输出轴直接连接,且传动组件可至少部分位于制动缸11内。传动组件具体可以为能够将旋转运动变为直线运动的一种结构,这样,当电机21的输出轴转动时,即可驱动传动组件位于制动缸11内的部分移动。示例性地,传动组件可以包括螺杆22和螺母23,其中,螺杆22的一端与电机21的输出轴直接连接,另一端可伸入缸体111的密封腔1111内。具体实施时,缸体111的封闭端可设置有通孔,螺杆22具体可由通孔伸入至密封腔1111。螺母23设置于密封腔1111内,且螺母23安装于螺杆22上,也即,螺母23与螺杆22之间螺纹联接。这样,当电机21驱动螺杆22转动时,安装于螺杆22上的螺母23就可以沿螺杆22的轴向移动。在本申请实施例中,螺杆22的轴向可以与缸体111的长度方向一致,从而使得螺母23在缸体111内的移动方向与活塞112的移动方向一致。
应当理解的是,螺母23的移动方向由电机21的转动方向决定,通过控制电机21的正反转即可使螺母23向右或者向左移动,此处的向右移动即为朝向远离缸体111的封闭端的方向移动,向左移动即为朝向靠近缸体111的封闭端的方向移动。例如,可以设定当电机21正转时,螺母23向右移动,当电机21反转时,螺母23向左移动。
在一些实施例中,螺母23可以安装于螺杆22的端部,示例性地,螺母23可以为一端封闭的帽状结构,这样在将螺母23安装于螺杆22上后,螺母23的封闭端可以始终凸出于螺杆22的端部。另外,在本实施例中,活塞112的第一端1121可以设置有开孔1123,螺杆22的端部可以伸入至开孔1123内,这时螺母23也位于开孔1123内。当电机21正转并驱动螺杆22转动时,螺母23向右移动,螺母23的封闭端可以靠近或者抵接到开孔1123的底部,以便于向活塞112施加远离缸体111的封闭端的方向的作用力;当电机21反转并驱动螺杆22转动时,螺母23向左移动,螺母23的封闭端远离开孔1123的底部,以便于解除对活塞112施加的作用力。
在本申请实施例中,制动装置具体可采用液压驱动的方式控制制动器10的动作。制动装置可与制动缸11的密封腔1111连接,通过控制向密封腔1111内流入的油液流量来驱动活塞112左右移动,进而由活塞112控制制动钳12的工作状态。具体来说,当制动装置中的油液流入制动缸11的密封腔1111内时,密封腔1111内的液压力增大,活塞112可向右移动,从而带动制动钳12夹紧制动盘,实现车轮的制动;当制动装置中的油液流出制动缸11的密封腔1111时,密封腔1111内的液压力减小,活塞112可向左移动,从而解除对制动盘施加的制动力。
图3为本申请实施例提供的制动装置的结构示意图。参考图3所示,制动装置30可包括两套液压装置,分别为第一液压装置31和第二液压装置32。其中,第一液压装置31具体可以为智能制动系统(intelligent braking system,IBS),第二液压装置32具体可以为 冗余制动单元(redundant brake unit,RBU)。第一液压装置31和第二液压装置32分别与制动器的制动缸连接,二者可以协同控制制动器工作,以提高对制动缸内压力的控制精度,另外二者也可以单独控制制动器工作,也即,第一液压装置31与第二液压装置32可以互为冗余,这样即使其中一个液压装置发生故障,也可以保证制动装置30整体能够继续正常运行,从而提高制动装置30的可靠性。
具体实施时,第一液压装置31可包括第一控制器311、主缸312、踏板感觉模拟器313、油壶314、行程传感器315、液位传感器、电磁阀、单向阀以及制动管路等,第二液压装置32可包括第二控制器321、三相电机322、电缸323、电机位置传感器324、电磁阀、单向阀、压力传感器以及制动管路等。另外,制动装置至少还可以包括各种电磁阀驱动、电机驱动以及各种信号处理及控制输出接口。第一控制器311与第二控制器321可接收各种传感器的测量或检测信号,如环境条件、驾驶员输入、制动系统状态等信息,通过计算和判断来控制制动装置30的制动特性。
第一液压装置31与第二液压装置32协同工作时,第一控制器311可控制电磁阀a和电磁阀b打开,以及控制电磁阀c、电磁阀d关闭,制动踏板40推动主缸312中的油液经电磁阀b流入踏板感觉模拟器313,并且第一控制器311采集行程传感器315信号、主缸312处的压力传感器信号以及油壶314的液位信号,并通过信号接口传递给第二控制器321。第二控制器321根据第一控制器311传递的行程传感器315信号、主缸312处的压力传感器信号,确定驾驶员的制动意图,控制三相电机322推动电缸323内的活塞向右运动,并控制电磁阀e、电磁阀f、电磁阀g、电磁阀h、电磁阀i、电磁阀j、电磁阀k、电磁阀l打开,电缸323右腔内的一部分油液分两路,一路油液经过打开的电磁阀e以及电磁阀f和电磁阀g流入其中两个车轮(即左前(front left,FL)车轮与右后(rear right,RR)车轮)处的制动缸,另一路油液经过打开的电磁阀h以及电磁阀i和电磁阀j流入另外两个车轮(即左后(rear left,RL)车轮与右前(front right,FR)车轮)处的制动缸,从而实现四个车轮的制动;电缸323右腔内的另一部分油液经过打开的电磁阀k、电磁阀l流入电缸323左腔。
需要说明的是,当某一车轮处的制动缸内的压力过大时,第二控制器321可控制该制动缸处与电缸以及主缸连接的电磁阀(即上述电磁阀f、电磁阀g、电磁阀i、电磁阀j中的某一个)关闭,并控制该制动缸处与油壶314连接的电磁阀(电磁阀m、电磁阀n、电磁阀o、电磁阀p中的某一个)打开,使该制动缸内的油液流入油壶314,实现减压。例如,当左前车轮FL处的制动缸内的压力过大时,可关闭电磁阀f,切断电缸323右腔与车轮FL处的制动缸之间的油液通路,并打开电磁阀m,使车轮FL处的制动缸内的油液通过电磁阀m流入油壶。
当第二液压装置32出现故障,如电机322或者电缸323故障时,第一控制器311可控制电磁阀a、电磁阀b、电磁阀c和电磁阀d打开,主缸312内的油液一部分经过打开的电磁阀c以及电磁阀f和电磁阀g流入其中两个车轮(即FL车轮与RR车轮)处的制动缸,另一部分经过打开的电磁阀d以及电磁阀i和电磁阀j流入另外两个车轮(即RL车轮与FR车轮)处的制动缸,从而实现四个车轮的制动。
当第一液压装置出现故障,如主缸312或者踏板感觉模拟器313故障时,第一控制器311可采集行程传感器315信号以及油壶314的液位信号,并通过信号接口传递给第二控制器312。第二控制器312根据第一控制器311传递的行程传感器315信号,控制三相电 机322推动电缸323内的活塞向右运动,并控制电磁阀e、电磁阀f、电磁阀g、电磁阀h、电磁阀i、电磁阀j、电磁阀k、电磁阀l打开,电缸323右腔内的一部分油液分两路,一路油液经过打开的电磁阀e以及电磁阀f和电磁阀g流入其中两个车轮(即FL车轮与RR车轮)处的制动缸,另一路油液经过打开的电磁阀h以及电磁阀i和电磁阀j流入另外两个车轮(即RL车轮与FR车轮)处的制动缸,从而实现四个车轮的制动;电缸323右腔内的另一部分油液经过打开的电磁阀k、电磁阀l流入电缸323左腔。
请一并参考图2和图3,在本申请实施例中,制动系统200还可以包括控制单元,控制单元可分别与制动装置30和驻车装置20电性连接,控制单元可用于获取车辆的驻车信号,然后根据该驻车信号控制制动装置30驱动活塞112移动,以向制动盘施加制动力,并且在当活塞112的第二端1122移动至第一位置时,控制电机21驱动螺杆22转动,以通过螺杆22带动螺母23移动,使螺母23与活塞112的第一端1121抵接,也即使螺母23的封闭端与活塞1123的开孔的底部抵接,从而将活塞112固定在当前的位置,进而使制动钳12保持在夹紧制动盘的工作状态,实现车辆的驻车制动。另外,控制单元还可用于获取制动缸11内的液压力(即密封腔1111内的液压力),并在确定制动缸11内的液压力不小于目标液压力时,控制活塞112的第二端1122移动至第一位置。也就是说,本申请中的制动系统在进行驻车制动时,首先利用制动装置30产生相应的目标液压力以推动活塞112移动,使制动钳12夹紧制动盘,然后再控制电机21驱动螺母23移动,使螺母23顶到与活塞112抵接的位置。通过制动装置30的助力,在驻车时驻车装置20的电机21输出的力矩较小,因此对电机21的功率要求也较小,这样一方面可以降低电机21的成本,另一方面也可以在驻车装置20中省略掉用于增矩作用的减速机构,从而既可以简化驻车装置20的结构,又可以提升车辆整体的NVH性能。
需要说明的是,在螺母23移动至与活塞112的第一端1121抵接的位置之后,控制单元即可控制电机21停止工作,随后控制制动装置30停止对制动盘施加制动力,也即控制第一液压装置31与第二液压装置32退出建压,此时可完全依靠螺母23的抵接作用使制动钳12夹紧制动盘。
在一些实施例中,控制单元还可用于:当确定第一液压装置31发生故障时,控制第二液压装置32驱动所述活塞移动;类似地,当确定第二液压装置32发生故障时,控制第一液压装置31驱动所述活塞移动;以及,当确定第一液压装置31与第二液压装置32均未发生故障时,控制第一液压装置31及第二液压装置32共同驱动所述活塞移动。采用这种设计,第一液压装置31与第二液压装置32可以互为冗余,当其中一个液压装置失效后,另一个还可以继续工作,从而保障车辆完成整个驻车动作,满足车辆运行的功能安全需求。
本申请实施例中,控制单元还可用于:获取车辆的运行状态,根据车辆的运行状态确定车辆的驻车模式,然后根据驻车模式确定目标液压力。需要说明的是,车辆的目标液压力决定着活塞的第二端所在的位置,进而决定着车辆保持在驻车状态时制动盘所受到的作用力。车辆的目标液压力与车辆的运行状态相关,例如车辆是否存在外部请求,以及车辆的车速、轮速等信息都直接影响着目标驻车力。
在确定车辆的驻车模式时,控制单元还可用于:判断车辆是否存在外部请求;若确定车辆不存在外部请求,且车辆的运行状态满足驻车条件时,确定车辆为第一驻车模式,此时可根据车辆参数确定第一驻车力,该第一驻车力即为目标液压力;或者,若确定车辆存在外部请求,且车辆的运行状态不满足驻车条件时,确定车辆为第二驻车模式,此时可根 据外部请求确定第二驻车力,该第二驻车力即为目标液压力;或者,若确定车辆存在外部请求,且车辆的运行条件满足驻车条件时,确定车辆为第三驻车模式,此时可以第一驻车力为目标液压力,或者以第一驻车力与第二驻车力中的较大值为目标液压力。
其中,车辆的外部请求包括但不限于为车辆处于智能驾驶模式、制动防抱死模式或者驾驶辅助模式等等。车辆的驻车条件包括车辆是否收到驻车指令以及车辆的车速、轮速以及油门踏板的开度等是否符合要求。车辆参数可包括车辆所处道路的坡度、车辆的质量、车辆是否挂有拖车以及制动盘的温度是否大于等于温度阈值中的一项或多项。
在判断车辆的运行状态是否满足驻车条件时,控制单元还可用于:当确定车辆接收到驻车指令时,根据车辆的车速小于或者等于驻车车速阈值、车辆的轮速小于或者等于驻车轮速阈值、车辆的轮速小于或者等于驻车轮速阈值、车辆的油门踏板开度小于或者等于开度阈值等信息,确定车辆的运行状态满足驻车条件。
应当理解的是,驻车指令具体可由驾驶员发出,车辆的驾驶舱可设置有驻车控制按钮,该驻车控制按钮可与控制单元电性连接,驾驶员可通过激活该驻车控制按钮发出驻车指令。在确认接收到驻车指令后,先后确定车辆的车速以及轮速是否满足阈值要求。通常来讲,车轮在纯滚动的情况下,车速与轮速是相等的,这时只要车速满足设定的阈值要求,轮速也就能满足相应的阈值要求,但是若车轮出现移动的情况,车速与轮速就不再相等,因此通过分别判定车速与轮速是否满足要求可以更加准确地判断车辆是否满足驻车条件。另外,驻车车速阈值、驻车轮速阈值以及油门踏板开度等参数值可以通过试验确定,或者也可以通过经验得出,本申请对此不做具体限制。
此外,需要说明的是,在判断车辆的运行状态是否满足驻车条件时,若车辆未接收到驻车指令,则后续三个条件(车速、轮速以及油门踏板开度)无需再进行判断,直接返回开始继续判断车辆是否接收到驻车指令,直到确认接收到驻车指令之后,再继续对车速、轮速以及油门踏板开度进行判断,直到四个条件全部满足设定条件为止。
车辆在驻车状态时,在非驾驶员操作的情况下,受到外力的作用或者外界环境的影响下也可能会发生移动,从而存在一定的溜车风险。为了进一步降低这种风险,在本申请实施例中,控制单元还可用于根据车辆的轮速以及行驶方向等信息识别车辆是否处于溜车状态,并在确定车辆处于溜车状态时,控制制动装置30驱动活塞移动,以向制动盘施加制动力,使车辆由溜车状态恢复为静止状态。这时,在活塞的第二端移动至第二位置后,控制单元可控制电机21驱动螺杆22转动,使螺母23也移动至再次与活塞112的第一端1121抵接,以将活塞112固定在移动之后的位置,实现车辆的再次驻车制动。可以理解的,相较于第一次驻车制动,活塞112的位置会有一定的右移,也即,上述第二位置位于第一位置远离螺母的一侧。
另外,在解除驻车制动时,控制单元可控制制动装置30继续驱动活塞112移动,使活塞112的第二端1122移动至第三位置,该第三位置位于第一位置的远离螺母23的一侧,也即第一位置的右侧,从而使得螺母23与活塞112的第一端1121之间形成一定的间隙,从而解除电机21的负载,使电机21能够顺利正转或反转。之后控制单元可控制电机21反转,使得螺母23回退到起始位置,最后控制制动装置30停止建压,使车辆解除驻车制动。应当理解的是,若车辆在驻车过程中出现过溜车的情况,那么在解除驻车制动时,制动装置30使活塞112的第二端移动至的第三位置应当位于第二位置的右侧,以保证在螺母23与活塞112的第一端1121之间能够形成间隙。
图4为本申请实施例提供的制动系统的工况示意图。一并参考图2、图3和图4所示,车辆在由行驶状态开始驻车制动时,制动装置30驱动活塞112向右侧移动,活塞112带动制动钳12逐渐夹紧制动盘,密封腔1111的液压力逐渐增大,驾驶员可在此过程中激活驻车控制按钮。当密封腔1111的液压力增大至等于目标液压力时,电机21启动,电机21的转速可先增大后减小,以驱动螺母23向右侧移动,当螺母23顶到与活塞112抵接的位置时,电机21停止工作,制动装置30退出建压,密封腔1111的液压力逐渐减小至零,此时可完全依靠螺母23的抵接作用使制动钳12夹紧制动盘,实现车辆的驻车制动。车辆在驻车过程中,制动盘所受到的夹紧力逐渐增大,之后维持在一个定值。
当车辆在驻车过程中出现溜车现象时,制动装置30再次驱动活塞112向右侧移动,直至活塞112的第二端1122移动至第二位置,以使车辆由溜车状态恢复为静止状态。之后启动电机21,以驱动螺母23再次移动至与活塞112抵接的位置,实现车辆的再次驻车制动。然后电机21停止工作,制动装置30退出建压,密封腔1111的液压力逐渐减小至零。在车辆由溜车状态到再次驻车制动的过程,制动盘所受到的夹紧力也会相应地增大最后维持在一个定值。
本申请实施例还提供了一种制动系统的控制方法,其中制动系统的结构可参考前述实施例中的描述,此处不再进行赘述。该控制方法可包括以下步骤:
获取驻车信号;
根据驻车信号控制制动装置驱动制动缸的活塞移动;
在活塞移动至第一位置时,控制驻车装置的电机驱动传动组件移动至与活塞的第一端抵接的位置。
作为一种可能的实施例,上述控制方法还可包括:
获取制动缸内的液压力;
当制动缸内的液压力大于或等于目标液压力时,控制活塞的第二端移动至第一位置。可以理解的,该第一位置即为制动钳夹紧制动盘以使制动盘停止转动时,活塞的第二端所在的位置。
本申请实施例提供的制动系统的控制方法,在进行驻车制动时,首先利用制动装置产生相应的制动力,使制动钳夹紧制动盘,然后再控制电机驱动螺母移动,使螺母顶到与活塞抵接的位置。通过制动装置的助力,在驻车时驻车装置的电机输出的力矩较小,因此对电机的功率要求也较小,一方面可以降低电机的成本,另一方面也可以在驻车装置中省略掉用于增矩作用的减速机构,从而既可以简化驻车装置的结构,又可以提升车辆整体的NVH性能。
在一些实施例中,上述制动系统的控制方法还可以包括:
在第一液压装置发生故障时,控制第二液压装置驱动活塞移动;或者,
当确定第二液压装置发生故障时,控制第一液压装置驱动活塞移动;或者,
当确定第一液压装置与第二液压装置均未发生故障时,控制第一液压装置及第二液压装置驱动活塞移动。
采用这种设计,第一液压装置与第二液压装置可以互为冗余,当其中一个液压装置失效后,另一个还可以继续工作,从而保障车辆完成整个驻车动作,满足车辆运行的功能安全需求。
需要说明的是,在获取目标液压力之前,可先根据车辆的运行状态,对车辆的驻车模 式进行判断,然后根据确定的驻车模式计算目标液压力。以及,车辆在完成驻车制动之后,仍然有可能在外界环境的影响或者外力的作用下发生溜车,针对溜车状况,上述控制方法还可以包括安全模式控制策略的步骤,以使发生溜车的车辆再次驻车制动。基于此,请参考图5所示,本申请实施例提供的制动系统的控制方法具体可包括以下步骤:
步骤S101、判断驻车模式;
步骤S102、根据车辆所处的驻车模式,确定目标液压力;
步骤S103、常规控制模式,包括控制制动装置驱动活塞移动,以及控制电机驱动传动组件移动;
步骤S104、在车辆处于溜车状态时,控制制动系统进入安全模式控制策略。
图6为图5中所示的步骤101的具体流程图。参考图6所示,步骤S101具体可包括:
步骤S1011、若确定车辆不存在外部请求,且所述车辆的运行状态满足驻车条件时,确定车辆为第一驻车模式;
步骤S1012、若确定车辆存在外部请求,且所述车辆的运行状态不满足驻车条件时,确定车辆为第二驻车模式;
步骤S1013、若确定车辆存在外部请求,且所述车辆的运行状态满足驻车条件时,确定车辆为第三驻车模式。
其中,车辆的外部请求包括但不限于为车辆处于智能驾驶模式、制动防抱死模式或者驾驶辅助模式等等。车辆的驻车条件包括车辆是否收到驻车指令以及车辆的车速、轮速以及油门踏板的开度等是否符合要求。
其中,确定车辆的运行状态满足驻车条件具体可包括:
当确定车辆收到驻车指令时,根据车辆的车速小于或者等于驻车车速阈值、车辆的轮速小于或者等于驻车轮速阈值、车辆的轮速小于或者等于驻车轮速阈值、车辆的油门踏板开度小于或者等于开度阈值等信息。
可以理解的,在判断车辆的运行状态是否满足驻车条件时,只要未满足上述四个条件中的一个,即可以确定不满足驻车条件。例如,若车辆未接收到驻车指令,则后续三个条件(车速、轮速以及油门踏板开度)无需再进行判断,即确定车辆的运行状态不满足驻车条件。当确定车辆收到驻车指令,而车辆的车速不满足小于或者等于驻车车速阈值时,则其它两个条件(轮速以及油门踏板开度)也无需进行判断,即确定车辆的运行状态不满足驻车条件,以此类推。
图7为图5中所示的步骤S102的具体流程图。参考图7所示,步骤102具体可包括:
步骤S1021、在车辆为第一驻车模式时,根据车辆参数确定第一驻车力,该第一驻车力即为目标液压力;
步骤S1022、在车辆为第二驻车模式时,根据外部请求确定第二驻车力,此时第二驻车力即为目标液压力;
步骤S1023、在车辆为第三驻车模式时,可以确定第一驻车力为目标液压力,或者确定第一驻车力或者第二驻车力中的较大值为目标液压力。
其中,车辆参数可包括车辆所处道路的坡度、车辆的质量、车辆是否挂有拖车以及制动盘的温度是否大于等于温度阈值中的一项或多项。
图8为图5中所示的步骤S103的具体流程图。参考图8所示,步骤S103具体可包括:
步骤S1031、控制制动装置驱动活塞移动;
步骤S1032、判断活塞的第二端是否移动至第一位置,若是,执行步骤S1033,若否,返回执行步骤S1031;
步骤S1033、控制电机驱动传动组件向靠近活塞的第一端的方向移动;
步骤S1034、判断传动组件是否与活塞的第一端接触,若是,执行步骤S1035,若否,返回执行步骤1033;
步骤S1035、结束控制。
在本申请实施例中,步骤S104具体可包括:
根据车辆的轮速以及行驶方向等信息识别车辆是否处于溜车状态,当确定车辆处于溜车状态时,控制制动装驱动活塞移动至第二位置,该第二位置具体位于第一位置远离螺母的一侧,以使制动钳在活塞的推动下再次夹紧制动盘,进而使车辆由溜车状态恢复为静止状态。在确定车辆处于静止状态后,控制电机驱动螺杆转动,通过螺杆带动螺母移动至与活塞的第一端抵接的位置,以实现车辆的再次驻车制动。
基于相同的技术构思,本申请实施例还提供了一种计算设备1100。该计算设备1100可以是芯片或者芯片系统。可选的,在本申请实施例中芯片系统可以由芯片构成,也可以包含芯片和其他分立器件。
计算设备1100可以包括至少一个处理器1110,该处理器1110与存储器耦合,可选的,存储器可以位于该装置之内,存储器可以和处理器集成在一起,存储器也可以位于该装置之外。例如,计算设备1100还可以包括至少一个存储器1120。存储器1120保存实施上述任一实施例中必要计算机程序、配置信息、计算机程序或指令和/或数据;处理器1110可以执行存储器1120中存储的计算机程序,完成上述任一实施例中的方法。
计算设备1100中还可以包括通信接口1130,计算设备1100可以通过通信接口1130和其它设备进行信息交互。示例性的,所述通信接口1130可以是收发器、电路、总线、模块、管脚或其它类型的通信接口。当该计算设备1100为芯片类的装置或者电路时,该装置1100中的通信接口1130也可以是输入输出电路,可以输入信息(或称,接收信息)和输出信息(或称,发送信息),处理器为集成的处理器或者微处理器或者集成电路或则逻辑电路,处理器可以根据输入信息确定输出信息。
本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接,可以是电性,机械或其它的形式,用于装置、单元或模块之间的信息交互。处理器1110可能和存储器1120、通信接口1130协同操作。本申请实施例中不限定上述处理器1110、存储器1120以及通信接口1130之间的具体连接介质。
可选的,参见图9,所述处理器1110、所述存储器1120以及所述通信接口1130之间通过总线1140相互连接。所述总线1140可以是外设部件互连标准(peripheral component interconnect,PCI)总线或扩展工业标准结构(extended industry standard architecture,EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示,图9中仅用一条粗线表示,但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中,处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件,可以实现或者执行本申请实施例中的申请实施例的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所申请实施例的方法的步骤可以直接体现为硬件处理器执行完成,或者用处理器中的硬件及软件模块组合执行完成。
在本申请实施例中,存储器可以是非易失性存储器,比如硬盘(hard disk drive,HDD)或固态硬盘(solid-state drive,SSD)等,还可以是易失性存储器(volatile memory),例如随机存取存储器(random-access memory,RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质,但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置,用于存储程序指令和/或数据。
在一种可能的实施方式中,该计算设备1100可以应用于发送端,具体计算设备1100可以是发送端,也可以是能够支持发送端,实现上述涉及的任一实施例中发送端的功能的装置。存储器1120保存实现上述任一实施例中的发送端的功能的必要计算机程序、计算机程序或指令和/或数据。处理器1110可执行存储器1120存储的计算机程序,完成上述任一实施例中发送端执行的方法。应用于发送端,该计算设备1100中的通信接口可用于与接收端进行交互,如向接收端发送信息。
在另一种可能的实施方式中,该计算设备1100可以应用于接收端,具体计算设备1100可以是接收端,也可以是能够支持接收端,实现上述涉及的任一实施例中接收端的功能的装置。存储器1120保存实现上述任一实施例中的接收端的功能的必要计算机程序、计算机程序或指令和/或数据。处理器1110可执行存储器1120存储的计算机程序,完成上述任一实施例中接收端执行的方法。应用于接收端,该计算设备1100中的通信接口可用于与发送端进行交互,如接收来自发送端的信息。
由于本实施例提供的计算设备1100可应用于发送端,完成上述发送端执行的方法,或者应用于接收端,完成接收端执行的方法。因此其所能获得的技术效果可参考上述方法实施例,在此不再赘述。
基于以上实施例,本申请实施例还提供了一种计算机程序,当所述计算机程序在计算机上运行时,使得计算机实现图5至图8所示的任一实施例中所提供的方法。
基于以上实施例,本申请实施例还提供了一种计算机可读存储介质,该计算机可读存储介质中存储有计算机程序,所述计算机程序被计算机执行时,使得计算机实现图5至图8所示的任一实施例中所示的实施例中所提供的方法。其中,存储介质可以是计算机能够存取的任何可用介质。以此为例但不限于:计算机可读介质可以包括RAM、只读存储器(read-only memory,ROM)、电可擦可编程只读存储器(electrically erasable programmable read-only memory,EEPROM)、CD-ROM或其他光盘存储、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质。
本申请实施例提供的技术方案可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时,可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时,全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、接入网设备、终端设备或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中,或者从一个计算机可读存储介质向另一个计算机可读存储介质传输,例如,所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line,DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。 所述计算机可读存储介质可以是计算机可以存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如,软盘、硬盘、磁带)、光介质(例如,数字视频光盘(digital video disc,DVD))、或者半导体介质等。
以上所述,仅为本申请的具体实施方式,但本申请的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本申请揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本申请的保护范围之内。因此,本申请的保护范围应以所述权利要求的保护范围为准。

Claims (24)

  1. 一种制动系统,其特征在于,包括制动缸、制动装置和驻车装置,其中:
    所述制动缸包括活塞,所述活塞的第一端位于所述制动缸内,所述活塞的第二端伸出所述制动缸;
    所述制动装置与所述制动缸连接,用于驱动所述活塞移动;
    所述驻车装置包括电机和传动组件,所述电机与所述传动组件直接连接,所述传动组件至少部分位于所述制动缸内,所述电机用于驱动所述传动组件在所述制动缸内移动。
  2. 如权利要求1所述的制动系统,其特征在于,所述传动组件包括螺杆和螺母,所述电机的输出轴与所述螺杆直接连接,所述螺杆伸入所述制动缸内,所述螺母设置于所述制动缸且安装于所述螺杆上。
  3. 如权利要求1或2所述的制动系统,其特征在于,所述制动系统还包括制动钳和制动盘,制动钳与所述活塞的第二端连接,所述制动盘设置于所述制动钳的夹持空间内。
  4. 如权利要求3所述的制动系统,其特征在于,所述制动系统还包括控制单元,所述控制单元用于:
    获取驻车信号,根据所述驻车信号控制所述制动装置驱动所述活塞移动;
    在所述活塞的第二端移动至第一位置时,控制所述电机驱动所述传动组件移动至与所述活塞的第一端抵接的位置。
  5. 如权利要求4所述的制动系统,其特征在于,所述控制单元还用于:
    获取所述制动缸内的液压力;
    当所述制动缸内的液压力大于或等于目标液压力时,控制所述活塞的第二端移动至所述第一位置。
  6. 如权利要求4或5所述的制动系统,其特征在于,所述第一位置为所述制动钳夹紧所述制动盘时,所述活塞的第二端所在的位置。
  7. 如权利要求4~6任一项所述的制动系统,其特征在于,所述制动装置包括第一液压装置和第二液压装置,所述第一液压装置和所述第二液压装置分别与所述制动缸连接;
    所述控制单元还用于:
    在所述第一液压装置发生故障时,控制所述第二液压装置驱动所述活塞移动;或者,
    在所述第二液压装置发生故障时,控制所述第一液压装置驱动所述活塞移动;或者,
    在所述第一液压装置与所述第二液压装置均未发生故障时,控制所述第一液压装置及所述第二液压装置共同驱动所述活塞移动。
  8. 如权利要求4~7任一项所述的制动系统,其特征在于,所述控制单元还用于:
    获取车辆的运行状态,根据所述车辆的运行状态确定所述车辆的驻车模式,并根据所述驻车模式确定所述目标液压力。
  9. 如权利要求8所述的制动系统,其特征在于,所述控制单元还用于:
    在所述车辆不存在外部请求,且所述车辆的运行状态满足驻车条件时,确定第一驻车模式,根据车辆参数确定第一驻车力,所述第一驻车力为所述目标液压力;或者,
    在所述车辆存在所述外部请求,且所述车辆的运行状态不满足所述驻车条件时,确定第二驻车模式,根据所述外部请求确定第二驻车力,所述第二驻车力为所述目标液压力;或者,
    在所述车辆存在所述外部请求,且所述车辆的运行条件满足所述驻车条件时,确定第三驻车模式,确定所述第一驻车力为所述目标液压力,或者确定所述第一驻车力与所述第二驻车力中的较大值为所述目标液压力。
  10. 如权利要求9所述的制动系统,其特征在于,所述控制单元还用于:
    在所述车辆接收到驻车指令时,根据所述车辆的车速小于或者等于驻车车速阈值、所述车辆的轮速小于或者等于驻车轮速阈值、所述车辆的油门踏板开度小于或者等于开度阈值,确定所述车辆的运行状态满足所述驻车条件。
  11. 如权利要求9或10所述的制动系统,其特征在于,所述车辆参数包括所述车辆所处道路的坡度、所述车辆的质量、所述车辆是否挂有拖车或所述制动盘的温度中的一项或多项。
  12. 如权利要求4~11任一项所述的制动系统,其特征在于,所述控制单元还用于:
    在所述车辆处于溜车状态时,控制所述制动装置驱动所述活塞移动;
    在所述活塞的第二端移动至第二位置时,控制所述传动组件移动至与所述活塞的第一端抵接的位置;
    其中,所述第二位置位于所述第一位置远离所述活塞的第一端的一侧。
  13. 一种制动系统的控制方法,其特征在于,包括:
    获取驻车信号;
    根据所述驻车信号控制制动装置驱动制动缸的活塞移动;
    在所述活塞的第二端移动至第一位置时,控制驻车装置的电机驱动传动组件移动至与所述活塞的第一端抵接的位置。
  14. 如权利要求13所述的控制方法,其特征在于,所述控制方法还包括:
    获取所述制动缸内的液压力;
    当所述制动缸内的液压力大于或等于目标液压力时,控制所述活塞的第二端移动至所述第一位置。
  15. 如权利要求13或14所述的控制方法,其特征在于,所述第一位置为所述制动系统的制动钳夹紧制动盘时,所述活塞的第二端所在的位置。
  16. 如权利要求13~15任一项所述的控制方法,其特征在于,所述控制制动装置驱动制动缸的活塞移动,具体包括:
    在第一液压装置发生故障时,控制第二液压装置驱动所述活塞移动;或者,在所述第二液压装置发生故障时,控制所述第一液压装置驱动所述活塞移动;或者,在所述第一液压装置与所述第二液压装置均未发生故障时,控制所述第一液压装置及所述第二液压装置共同驱动所述活塞移动。
  17. 如权利要求13~16任一项所述的控制方法,其特征在于,所述控制方法还包括:
    获取车辆的运行状态,根据所述车辆的运行状态确定所述车辆的驻车模式,并根据所述驻车模式确定所述目标液压力。
  18. 如权利要求17所述的控制方法,其特征在于,所述控制方法还包括:
    在所述车辆不存在外部请求,且所述车辆的运行状态满足驻车条件时,确定第一驻车模式,根据车辆参数确定第一驻车力,所述第一驻车力为所述目标液压力;或者,
    在所述车辆存在所述外部请求,且所述车辆的运行状态不满足所述驻车条件时,确定第二驻车模式,根据所述外部请求确定第二驻车力,所述第二驻车力为所述目标液压力; 或者,
    在所述车辆存在所述外部请求,且所述车辆的运行条件满足所述驻车条件时,确定第三驻车模式,确定所述第一驻车力为所述目标液压力,或者确定所述第一驻车力与所述第二驻车力中的较大值为所述目标液压力。
  19. 如权利要求13~18任一项所述的控制方法,其特征在于,所述控制方法还包括:
    在所述车辆接收到驻车指令时,根据所述车辆的车速小于或者等于驻车车速阈值、所述车辆的轮速小于或者等于驻车轮速阈值、所述车辆的油门踏板开度小于或者等于开度阈值中的一项或多项,确定所述车辆的运行状态满足所述驻车条件。
  20. 如权利要求13~19任一项所述的控制方法,其特征在于,所述控制方法还包括:
    在所述车辆处于溜车状态时,控制所述制动装置驱动所述活塞移动;
    在所述活塞的第二端移动至所述第一位置时,控制所述传动组件移动至与所述活塞的第一端抵接的位置;
    其中,所述第二位置位于所述第一位置远离所述活塞的第一端的一侧。
  21. 一种计算设备,其特征在于,包括:
    处理器,所述处理器和存储器耦合,所述存储器存储有程序指令,所述处理器用于执行所述程序指令,以实现如权利要求13~20任一项所述的方法。
  22. 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质上存储有指令,当所述指令在计算机上运行时,使得所述计算机实现如权利要求13~20任一项所述的方法。
  23. 一种计算机程序,其特征在于,包括指令,当所述指令在计算机上运行时,使得所述计算机实现如权利要求13~20任一项所述的方法。
  24. 一种车辆,其特征在于,包括车轮以及如权利要求1~12任一项所述的制动系统,所述制动系统与所述车轮传动连接。
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