CN110562227B - Electro-hydraulic coupling braking system and vehicle - Google Patents
Electro-hydraulic coupling braking system and vehicle Download PDFInfo
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- CN110562227B CN110562227B CN201910779370.2A CN201910779370A CN110562227B CN 110562227 B CN110562227 B CN 110562227B CN 201910779370 A CN201910779370 A CN 201910779370A CN 110562227 B CN110562227 B CN 110562227B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/58—Combined or convertible systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
Abstract
The invention relates to the technical field of vehicle braking systems, and discloses an electro-hydraulic coupling braking system and a vehicle. The hydraulic brake device comprises a hydraulic circuit, a brake wheel cylinder, a pressure plate and a brake disc, wherein the brake disc is configured to be arranged on a wheel, hydraulic oil in a brake master cylinder can be injected into the brake wheel cylinder through the hydraulic circuit by stepping on a brake pedal, so that the pressure plate is pressed on the brake disc, and hydraulic braking is realized. The electric control brake device comprises a brake driver and a transmission assembly which are connected, the transmission assembly is connected with the pressure plate, and the brake driver can drive the pressure plate to be pressed on the brake disc through the transmission assembly to realize electric control brake. The detection control module can control the electric control brake device to start or stop working, so that hydraulic brake and electric control brake can be mutually backed up, and the brake safety is ensured.
Description
Technical Field
The invention relates to the technical field of vehicle braking systems, in particular to an electro-hydraulic coupling braking system and a vehicle.
Background
The braking system is one of the important components of the automobile, is directly related to the comprehensive performance and life and property safety of the automobile, and generally adopts a drum type or disc type friction braking mode to convert the kinetic energy and potential energy of the automobile into heat energy through friction so as to realize the aim of decelerating or braking the automobile. Although the traditional hydraulic and pneumatic service brake can meet various requirements of the existing brake laws and regulations, the traditional hydraulic and pneumatic service brake has the defects of low response speed, incapability of being actively regulated, difficulty in integrated control and the like, and is not suitable for the development requirements of the current automobile.
The brake-by-wire is extended from the vacuum booster and a motor is used to push the master cylinder piston instead of the vacuum booster. However, since the space of the chassis of the automobile is narrow, the size of the motor must be small, and a set of efficient speed reducer needs to be arranged at the same time, so that the torque of the motor can be converted into strong linear thrust. An Electro-Mechanical Braking System (EMB) has the advantages of small size, function integration, high reliability and the like, and more automobile Braking systems adopt the EMB. However, EMB has the following problems: 1) the failure of the brake-by-wire system can be caused by insufficient electric quantity of a system power supply; 2) a large amount of heat generated in the high-speed braking process has higher requirement on the stability of the motor.
Therefore, there is a need for an electro-hydraulic coupling brake system to solve the above problems.
Disclosure of Invention
An object of the present invention is to provide an electro-hydraulic coupling brake system, which can provide a backup brake system, provide braking force, and ensure braking safety.
Another object of the present invention is to provide a vehicle, which can provide a backup braking system by applying the above electro-hydraulic coupling braking system, provide braking force, and ensure braking safety.
In order to realize the purpose, the following technical scheme is provided:
an electricity-liquid coupling braking system, includes brake pedal and the master cylinder that links, electricity-liquid coupling braking system still includes:
the electro-hydraulic coupling brake module comprises a hydraulic brake device and an electric control brake device, wherein the hydraulic brake device comprises a hydraulic circuit, a brake wheel cylinder, a pressure plate and a brake disc, the brake disc is configured to be arranged on a wheel, the brake wheel cylinder is connected with a brake master cylinder through the hydraulic circuit, and hydraulic oil in the brake master cylinder can enter the brake wheel cylinder through the hydraulic circuit so as to enable the pressure plate to be pressed on the brake disc; the electric control brake device comprises a brake driver and a transmission assembly which are connected, the transmission assembly is connected with the pressure plate, and the brake driver can drive the pressure plate to be pressed on the brake disc through the transmission assembly;
the detection control module is in communication connection with the electro-hydraulic coupling brake module and can detect the movement stroke of the brake pedal and/or the pressure of the hydraulic circuit and/or the wheel speed of the brake disc and enable the electric control brake device to start working or stop working according to the detected stroke signal and/or pressure signal and/or wheel speed signal.
Furthermore, the hydraulic braking device also comprises a wheel cylinder piston and a wheel cylinder spring, the wheel cylinder piston, the wheel cylinder spring and the pressure plate are sequentially connected, the transmission assembly is connected with the wheel cylinder piston, and the brake driver can drive the wheel cylinder piston to move so as to enable the pressure plate to be pressed on the brake disc.
Further, the transmission assembly comprises a screw rod, a first transmission wheel, a second transmission wheel and a transmission belt, one end of the screw rod is fixedly connected with the wheel cylinder piston, the first transmission wheel is connected with the output end of the brake driver, the second transmission wheel is in threaded connection with the screw rod, the transmission belt is wound on the first transmission wheel and the second transmission wheel, and the brake driver can drive the screw rod to drive the wheel cylinder piston to move so as to enable the pressure plate to move.
Further, the hydraulic braking device further comprises an oil return cylinder and an oil return piston which are matched, the volume of the oil return cylinder is larger than that of the brake wheel cylinder, the oil return cylinder is connected with the brake master cylinder through the hydraulic circuit, and the oil return piston and the wheel cylinder piston are respectively fixedly connected with the two ends of the lead screw.
Further, the detection control module comprises a central controller and a first sensor, the central controller is in communication connection with the brake driver, the first sensor can detect the travel signal and transmit the travel signal to the central controller, and the central controller can enable the brake driver to start or stop working according to the travel signal.
Further, the detection control module further comprises a brake controller and a second sensor, the brake controller is in communication connection with the brake driver, the second sensor can detect the wheel speed signal and transmit the wheel speed signal to the brake controller, and the brake controller can enable the brake driver to start or stop working according to the wheel speed signal.
Further, the detection control module further comprises a third sensor, the third sensor can detect the pressure signal and transmit the pressure signal to the central controller, and the central controller can start or stop the brake driver according to the pressure signal.
Further, the central controller is in communication connection with the brake controller and can transmit the stroke signal and/or the pressure signal to the brake controller, and the brake controller can enable the brake driver to start or stop working according to the stroke signal and/or the pressure signal.
Further, the number of the electro-hydraulic coupling brake modules is four, and the four electro-hydraulic coupling brake modules are configured to be matched with four wheels respectively.
A vehicle comprising an electro-hydraulic coupled braking system as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an electro-hydraulic coupling brake system which comprises a brake pedal, a brake master cylinder, an electro-hydraulic coupling brake module and a detection control module, wherein the electro-hydraulic coupling brake module comprises a hydraulic brake device and an electric control brake device. The hydraulic brake device comprises a hydraulic circuit, a brake wheel cylinder, a pressure plate and a brake disc, wherein the brake disc is configured to be arranged on a wheel, hydraulic oil in a brake master cylinder can be injected into the brake wheel cylinder through the hydraulic circuit by stepping on a brake pedal, so that the pressure plate is pressed on the brake disc, and hydraulic braking is realized. The electric control brake device comprises a brake driver and a transmission assembly which are connected, the transmission assembly is connected with the pressure plate, and the brake driver can drive the pressure plate to be pressed on the brake disc through the transmission assembly to realize electric control brake. The detection control module is in communication connection with the electro-hydraulic coupling brake module, can detect the movement stroke of a brake pedal and/or the pressure of a hydraulic circuit and/or the wheel speed of a brake disc, and enables the electric control brake device to start or stop working according to the detected stroke signal and/or pressure signal and/or wheel speed signal. The electro-hydraulic coupling brake system provided by the invention has the advantages that the hydraulic brake and the electric control brake are mutually backups, both can provide braking force, and can work simultaneously or independently, so that the braking safety is ensured.
According to the vehicle provided by the invention, by applying the electro-hydraulic coupling brake system, a standby brake system can be provided, braking force is provided, and braking safety is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an electro-hydraulic coupling brake module provided by the present invention;
FIG. 2 is a schematic flow chart of the working mode of the electro-hydraulic coupling brake system provided by the invention;
FIG. 3 is a schematic flow chart of a detection control module according to the present invention;
fig. 4 is a schematic flow chart of the electro-hydraulic coupling brake system provided by the invention.
Reference numerals:
11-brake wheel cylinders; 12-a platen; 13-a brake disc; 14-wheel cylinder piston; 15-wheel cylinder spring; 16-a brake caliper body;
21-returning the oil cylinder; 22-a scavenge piston;
31-a brake actuator; 32-a lead screw; 33-a first drive wheel; 34-a second transmission wheel; 35-a transmission belt.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when the product is used, and are only for convenience of description of the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", and the like are used for descriptive purposes only or to distinguish between different structures or components and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the embodiment provides an electro-hydraulic coupling brake system, which includes a brake pedal, a brake master cylinder, an electro-hydraulic coupling brake module, and a detection control module, where the electro-hydraulic coupling brake module includes a hydraulic brake device and an electric control brake device. The hydraulic brake device includes a hydraulic circuit, a brake cylinder 11, a pressure plate 12, and a brake disc 13, the brake disc 13 is configured to be disposed on a wheel, and hydraulic oil in a brake master cylinder can be injected into the brake cylinder 11 through the hydraulic circuit by stepping on a brake pedal to press the pressure plate 12 against the brake disc 13, thereby achieving hydraulic braking. The electric control brake device comprises a brake driver 31 and a transmission assembly which are connected, the transmission assembly is connected with the pressure plate 12, and the brake driver 31 can drive the pressure plate 12 to press the brake disc 13 through the transmission assembly to realize electric control brake. The detection control module is in communication connection with the electro-hydraulic coupling brake module and can detect the movement stroke of a brake pedal and/or the pressure of a hydraulic circuit and/or the wheel speed of the brake disc 13 and enable the electric control brake device to start or stop working according to the detected stroke signal and/or pressure signal and/or wheel speed signal. The electro-hydraulic coupling braking system provided by the embodiment has the advantages that the hydraulic braking and the electric control braking are mutually backups, both can provide braking force, and can work simultaneously or independently, so that the braking safety is ensured.
In short, during hydraulic braking: the brake pedal is connected with a master cylinder piston of the brake master cylinder, when the brake pedal is stepped on, the brake master cylinder converts the mechanical movement of the brake pedal into hydraulic flow in a hydraulic circuit and enters the brake wheel cylinder 11, the hydraulic flow is converted into the movement of the pressure plate 12 through the brake wheel cylinder 11, so that the pressure plate 12 is pressed on the brake disc 13 to form the friction force for rotating the brake disc 13, and the wheel is decelerated or stopped.
In the electrically controlled braking process: when a brake pedal is stepped, the detection control module detects the movement stroke of the brake pedal, then the electric control brake device is controlled to start working, and the brake driver 31 drives the pressure plate 12 to move and press the brake disc 13 through the transmission assembly so as to decelerate or stop the wheel; or, when the brake pedal is stepped on, the detection module detects that the pressure of the hydraulic circuit is increased, then the electronic control brake device is controlled to start working, and the brake driver 31 drives the pressure plate 12 to move and press the brake disc 13 through the transmission assembly so as to enable the wheel to realize speed reduction or stop; or, when the brake pedal is stepped on, the detection module detects that the wheel speed of the brake disc 13 is reduced, then the electronic control brake device is controlled to start working, and the brake driver 31 drives the pressure disc 12 to move and press the brake disc 13 through the transmission assembly so as to enable the wheel to realize speed reduction or stop; the three signal controls can work simultaneously, can work independently, and can work simultaneously by any two signals, which are not described one by one. Preferably, the brake actuator 31 is an electric motor.
As shown in fig. 2, it should be noted that the hydraulic brake and the electric control brake may work simultaneously or separately, so that the hydraulic brake and the electric control brake are backup to each other, and may work independently to perform a braking task when any one of the brakes fails. For example, hydraulic braking without electrically controlled brake assistance may be achieved in the event of a failure of the electrically controlled brake, for example, a failure of the brake actuator 31 or a failure of the communication link. In the event of a hydraulic Brake failure, for example, a hydraulic circuit leaks oil, and at this time, all braking force is achieved by the Brake actuator 31 pushing the pressure plate 12, a pure Brake-by-wire mode is established, and the Brake mode can be triggered by a Brake pedal or an Electronic Parking Brake (EPB) button.
As shown in fig. 1, the hydraulic brake device further includes a wheel cylinder piston 14 and a wheel cylinder spring 15, the wheel cylinder piston 14, the wheel cylinder spring 15 and the pressure plate 12 are connected in sequence, the transmission assembly is connected with the wheel cylinder piston 14, and the brake actuator 31 can drive the wheel cylinder piston 14 to move so as to press the pressure plate 12 against the brake disk 13. Specifically, brake actuator 31 can drive wheel cylinder piston 14 to move through the transmission assembly, and wheel cylinder piston 14 drives pressure plate 12 to move and press against brake plate 13 through wheel cylinder spring 15. In short, the wheel cylinder spring 15 is used to connect the wheel cylinder piston 14 and the pressure plate 12, and converts the displacement of the wheel cylinder piston 14 into the pressing force of the pressure plate 12.
Further, the hydraulic brake device further comprises a brake caliper body 16, the brake caliper body 16 is arranged opposite to the pressure plate 12 and located on two sides of the brake disc 13, and the pressure plate 12 and the brake caliper body 16 are matched to press the brake disc 13, so that the wheel is decelerated or stopped.
Preferably, the transmission assembly includes a lead screw 32, a first transmission wheel 33, a second transmission wheel 34 and a transmission belt 35, one end of the lead screw 32 is fixedly connected with the wheel cylinder piston 14, the first transmission wheel 33 is connected with the output end of the brake driver 31, the second transmission wheel 34 is in threaded connection with the lead screw 32, the transmission belt 35 is wound on the first transmission wheel 33 and the second transmission wheel 34, and the brake driver 31 can drive the lead screw 32 to drive the wheel cylinder piston 14 to move through the transmission assembly so as to move the pressure plate 12. Specifically, the screw 32 is a ball screw, so that when the brake actuator 31 drives the first transmission wheel 33 to rotate, the second transmission wheel 34 is driven to rotate by the transmission belt 35, and the second transmission wheel 34 is in threaded connection with the ball screw to realize linear movement of the ball screw.
It should be noted that the brake actuator 31 has a self-locking device, and when the brake actuator 31 rotates to a target angle, it can be locked at a current position, and no extra capability needs to be provided to maintain the braking force. In other words, the screw 32 can only be driven by the rotation of the second transmission wheel 34, but the screw 32 cannot be driven to rotate the second transmission wheel 34.
Preferably, the hydraulic braking device further comprises a return oil cylinder 21 and a return oil piston 22 which are matched, the volume of the return oil cylinder 21 is larger than that of the brake wheel cylinder 11, the return oil cylinder 21 is connected with the brake master cylinder through a hydraulic circuit, and the return oil piston 22 and the wheel cylinder piston 14 are respectively and fixedly connected with two ends of the screw rod 32. The volume of the oil return cylinder 21 is larger than that of the brake wheel cylinder 11, so that on one hand, the oil return cylinder 21 can be used for storing hydraulic oil, and when the electric control power is increased, the oil return cylinder 21 absorbs the hydraulic oil from the brake master cylinder to reduce the hydraulic braking force; when the electric control power is reduced, the oil return cylinder 21 returns oil to the brake master cylinder, so that the hydraulic braking force is increased, and the total braking force is kept unchanged.
Illustratively, in the present embodiment, the cross-sectional area of the return cylinder 21 is larger than the cross-sectional area of the brake wheel cylinder 11 to reduce the length of the return cylinder 21. In addition, the oil return function during single-wheel force unloading is realized through the volume difference between the oil return cylinder 21 and the brake wheel cylinder 11, the wheel braking force triggered by the ABS is transferred to other wheels, the total braking strength is kept unchanged, and the feedback is provided for a driver.
Further, a return cylinder 21 is provided on the caliper body 16, and specifically, the return cylinder 21 is fixedly provided on an end of the caliper body 16 away from the pressure plate 12.
Preferably, the detection control module comprises a central controller in communication with the brake actuator 31 and a first sensor capable of detecting and transmitting a travel signal to the central controller, the central controller being capable of activating or deactivating the brake actuator 31 according to the travel signal. Specifically, when the brake pedal is stepped on, the first sensor can detect the movement stroke of the depression of the brake pedal and transmit the stroke signal to the central controller, and the central controller controls the brake driver 31 to start working; when the brake pedal returns to the original position, the first sensor can detect the movement stroke of the brake pedal returning to the original position, and transmits a stroke signal to the central controller, and the central controller controls the brake driver 31 to stop working.
Optionally, the detection control module further includes a brake controller in communication with the brake driver 31, and a second sensor capable of detecting a wheel speed signal and transmitting it to the brake controller, and the brake controller is capable of starting or stopping the brake driver 31 according to the wheel speed signal. Specifically, when the brake pedal is depressed, the brake disc 13 is decelerated through hydraulic braking, the second sensor can detect a wheel speed signal of the deceleration of the brake disc 13 and transmit the wheel speed signal to the brake controller, and the brake controller controls the brake driver 31 to start operating; when the brake pedal is returned to the original position, the hydraulic brake is stopped, the second sensor can detect the non-decelerated wheel speed signal of the brake disc 13 and transmit the wheel speed signal to the brake controller, and the brake controller controls the brake driver 31 to stop working.
Further, the detection control module further includes a third sensor capable of detecting a pressure signal and transmitting the pressure signal to the central controller, and the central controller is capable of starting or stopping the operation of the brake actuator 31 according to the pressure signal. Specifically, when the brake pedal is stepped on, the hydraulic brake device operates, the pressure of the hydraulic circuit increases, the third sensor can detect a pressure signal of the pressure increase of the hydraulic circuit and transmit the pressure signal to the central controller, and the central controller controls the brake driver 31 to start operating; when the brake pedal returns to the original position, the hydraulic brake stops working, the pressure of the hydraulic circuit returns to normal, the third sensor can detect the pressure signal of the pressure recovery of the hydraulic circuit and transmit the pressure signal to the central controller, and the central controller controls the brake driver 31 to stop working.
Preferably, the central controller is in communication with the brake controller and is capable of transmitting a stroke signal and/or a pressure signal to the brake controller, which is capable of activating or deactivating the brake actuator 31 in response to the stroke signal and/or the pressure signal. In other words, the stroke signal and the pressure signal are fed back to the central controller, and then transmitted to the brake controller by the central controller, and the brake controller directly gives a command to the brake actuator 31.
Illustratively, as shown in fig. 3, the central controller can receive various sensor signals such as pressure signals, travel signals, steering wheel angle, longitudinal acceleration, lateral acceleration, vertical acceleration, yaw rate, EPB switches, external requests (ACC/APA), power assist mode, etc., and forward to the brake actuators 31 via bus communication. The central controller controls the braking force of each wheel according to an external request and a bus communication signal, and realizes the functions of brake boosting, braking force distribution, line control mode, distribution control, brake anti-skid, sideslip inhibition and the like.
Preferably, as shown in fig. 4, in the present embodiment, the number of the electro-hydraulic coupling brake modules is four, and four electro-hydraulic coupling brake modules are configured to be respectively matched with four wheels. The detection control module, the brake pedal and the brake master cylinder are used for realizing the combined work or the independent work of the four electro-hydraulic coupling brake modules.
As shown in fig. 4, the central controller can analyze the state of each wheel according to the dynamics of the entire vehicle and allocate the work tasks of each brake actuator 31. The brake controller can receive wheel speed signals and transmit the wheel speed signals to the central controller, and the central controller controls the braking force of each wheel according to external requests and bus communication signals simultaneously, so that the functions of brake boosting, line control mode, distribution control, brake anti-skidding, sideslip inhibition and the like are realized.
Specifically, the brake boosting function means that the hydraulic brake and the electronically controlled brake are simultaneously operated so that the actual braking force is higher than the hydraulic braking force. The braking force distribution function means that the braking force of each wheel can be independently controlled, the braking force of each wheel can be distributed according to the current longitudinal acceleration and lateral acceleration of the vehicle, the phenomenon of brake locking is avoided or delayed, and the limit value of the braking strength is increased. The brake anti-skid function means that the brake intensity of a single wheel can be adjusted, when the brake is slipped, the brake force of the slipped wheel is reduced, and other wheels compensate the corresponding brake force to maintain the current brake intensity and pedal force feedback. The sideslip inhibiting function means that when the central controller detects that sideslip occurs, a wheel needing braking is analyzed, a sideslip inhibiting task is distributed to the wheel, and the wheel adds extra braking force to maintain the stability of a vehicle body. The active braking function means that when a driver does not step on a brake pedal and receives a braking request (cruise, parking and dynamic parking braking), the brake driver 31 pushes the wheel cylinder spring 15 to generate braking force, and simultaneously, oil is sucked from the oil tank. After the driver steps on the brake pedal, the oil tank channel is blocked, the oil tank channel exits in response to the request state, and the auxiliary brake transition state is entered. After the pedal is lifted, the sucked oil is discharged and returns to a normal state. The parking brake function is that the EPB switch is pulled up, the brake driver 31 pushes the wheel cylinder spring 15 to generate brake force, and meanwhile, oil is sucked from the oil tank through the one-way valve to fill the cavity, and the vehicle enters a parking brake state. In the parking brake state, the brake pedal is pressed down and the EPB switch is released, so that the auxiliary brake transition state is entered. After the pedal is lifted, the sucked oil is discharged and returns to a normal state. The mode switching function means that the boosting intensity can be adjusted, different braking intensities can be realized under the condition of the same pedal force, and different driver characteristic requirements can be met. For the braking energy recovery function of the new energy automobile, higher pedal force can be fed back in time, and the limitation of energy recovery and the driving performance are improved.
The central controller distributes the state and control task of each brake actuator 31, and different wheel electro-hydraulic coupling brake modules have different control targets under different working states. And analyzing the current states of the whole vehicle and each wheel by the central controller, and distributing the control targets of the electrohydraulic coupling brake modules of each wheel.
The embodiment also provides a vehicle, through applying above-mentioned electricity liquid coupling braking system, can realize four-wheel parking braking, and hydraulic braking and automatically controlled braking are each other for the backup, guarantee safety braking.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. The electro-hydraulic coupling brake system comprises a brake pedal and a brake master cylinder which are connected, and is characterized by further comprising:
the electro-hydraulic coupling brake module comprises a hydraulic brake device and an electric control brake device, wherein the hydraulic brake device comprises a hydraulic circuit, a brake wheel cylinder (11), a pressure plate (12) and a brake disc (13), the brake disc (13) is configured to be arranged on a wheel, the brake wheel cylinder (11) is connected with a brake master cylinder through the hydraulic circuit, and hydraulic oil in the brake master cylinder can enter the brake wheel cylinder (11) through the hydraulic circuit so as to enable the pressure plate (12) to be pressed on the brake disc (13); the electronic control brake device comprises a brake driver (31) and a transmission assembly which are connected, the transmission assembly is connected with the pressure plate (12), and the brake driver (31) can drive the pressure plate (12) to be pressed on the brake disc (13) through the transmission assembly;
the detection control module is in communication connection with the electro-hydraulic coupling brake module and can detect the movement stroke of the brake pedal, the pressure of the hydraulic circuit and the wheel speed of the brake disc (13) and enable the electric control brake device to start or stop working according to the detected stroke signal and wheel speed signal, or pressure signal and wheel speed signal, or stroke signal, pressure signal and wheel speed signal;
the hydraulic brake device further comprises a wheel cylinder piston (14) and a wheel cylinder spring (15), the wheel cylinder piston (14), the wheel cylinder spring (15) and the pressure plate (12) are sequentially connected, the transmission assembly is connected with the wheel cylinder piston (14), and the brake driver (31) can drive the wheel cylinder piston (14) to move so as to enable the pressure plate (12) to be pressed on the brake disc (13);
the transmission assembly comprises a lead screw (32), a first transmission wheel (33), a second transmission wheel (34) and a transmission belt (35), one end of the lead screw (32) is fixedly connected with the wheel cylinder piston (14), the first transmission wheel (33) is connected with the output end of the brake driver (31), the second transmission wheel (34) is in threaded connection with the lead screw (32), the transmission belt (35) is wound on the first transmission wheel (33) and the second transmission wheel (34), and the brake driver (31) can drive the lead screw (32) to drive the wheel cylinder piston (14) to move through the transmission assembly so as to enable the pressure plate (12) to move; the brake actuator (31) has a self-locking device;
the hydraulic braking device further comprises a return oil cylinder (21) and a return oil piston (22) which are matched with each other, the volume of the return oil cylinder (21) is larger than that of the brake wheel cylinder (11), the return oil cylinder (21) is connected with the brake master cylinder through the hydraulic circuit, and the return oil piston (22) and the wheel cylinder piston (14) are respectively fixedly connected with two ends of the lead screw (32).
2. The electro-hydraulic coupled brake system of claim 1, wherein the detection control module comprises a central controller in communication with the brake actuator (31) and a first sensor capable of detecting and transmitting the travel signal to the central controller, the central controller being capable of activating or deactivating the brake actuator (31) in accordance with the travel signal.
3. The electro-hydraulic coupled brake system of claim 2, wherein the detection control module further comprises a brake controller in communication with the brake driver (31) and a second sensor capable of detecting the wheel speed signal and transmitting it to the brake controller, the brake controller being capable of activating or deactivating the brake driver (31) in response to the wheel speed signal.
4. The electro-hydraulic coupled brake system of claim 3, wherein the detection control module further comprises a third sensor capable of detecting the pressure signal and transmitting it to the central controller, the central controller being capable of activating or deactivating the brake actuator (31) as a function of the pressure signal.
5. The electrohydraulic coupling brake system according to claim 4, characterized in that the central controller is connected in communication with the brake controller and can transmit the stroke signal and/or the pressure signal to the brake controller, and the brake controller can start or stop the brake actuator (31) according to the stroke signal and/or the pressure signal.
6. The electro-hydraulic coupled brake system of claim 1, wherein the number of electro-hydraulic coupled brake modules is four, the four electro-hydraulic coupled brake modules being configured to mate with four wheels, respectively.
7. A vehicle comprising an electro-hydraulic coupled brake system according to any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910779370.2A CN110562227B (en) | 2019-08-22 | 2019-08-22 | Electro-hydraulic coupling braking system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910779370.2A CN110562227B (en) | 2019-08-22 | 2019-08-22 | Electro-hydraulic coupling braking system and vehicle |
Publications (2)
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