CN111907500A - Novel electro-hydraulic combined braking system and braking method thereof - Google Patents
Novel electro-hydraulic combined braking system and braking method thereof Download PDFInfo
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- CN111907500A CN111907500A CN202010787641.1A CN202010787641A CN111907500A CN 111907500 A CN111907500 A CN 111907500A CN 202010787641 A CN202010787641 A CN 202010787641A CN 111907500 A CN111907500 A CN 111907500A
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- 101150063504 CAN2 gene Proteins 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 3
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- 238000004891 communication Methods 0.000 description 2
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- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229920006351 engineering plastic Polymers 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- 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
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
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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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
- B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
Abstract
The invention discloses a novel electro-hydraulic combined braking system, relates to the technical field of automobile braking systems, and solves the problems of poor pedal feeling experience, no mechanical braking as a backup and low safety caused by the fact that a traditional vehicle braking system recovers braking energy. The brake comprises two hydraulic brake calipers arranged on a front/rear shaft of a vehicle and two electronic brake calipers arranged on the rear/front shaft of the vehicle; the hydraulic brake caliper is connected with a hydraulic pump for providing hydraulic pressure, and the hydraulic pump is connected with a power assisting motor for providing power assisting; the electronic brake caliper comprises an electronic brake motor for providing power; the power-assisted motor and the electronic brake motor are both connected to a controller BCU, and the controller BCU controls the power-assisted motor and the brake motor to run. The effects of facilitating braking energy recovery and safe backup braking are achieved.
Description
Technical Field
The invention relates to the technical field of automobile braking systems, in particular to a novel electro-hydraulic combined braking system and a braking method thereof.
Background
The conventional vehicle brake system is generally hydraulic brake, namely a front shaft and a rear shaft are both hydraulic brake calipers or brake drums, a brake main cylinder is required to be configured during working, the brake main cylinder is in a double-cavity form, vacuum boosting is generally adopted as a brake boosting source on the conventional vehicle, and the boosting form can cause insufficient vacuum degree when the plateau or the engine rotates at a low speed, so that the brake force is reduced. On new energy vehicle, not having the engine to provide the vacuum source, need additionally to dispose the vacuum pump and provide the vacuum for the booster, this kind of electron vacuum pump still need be equipped with a vacuum tank at the during operation, and the vacuum pump can produce certain noise at the during operation moreover, and is relatively poor for driver's actual experience, increases vacuum pump and pipeline and must also can increase certain cost.
In order to solve the problems of insufficient vacuum degree and braking assistance on new energy vehicles, a scheme of canceling a vacuum booster is designed by many manufacturers at present, and a motor is used as the assistance instead, so that the problem of braking assistance is solved, however, the vehicles cannot be safely stopped when the assistance motor fails, and even if mechanical braking is used as backup braking in the design scheme, the braking force which can be generated by braking only by the foot force of a driver is insufficient, and the response time is long due to the fact that the sum of the liquid amounts required by four wheels is large because the braking liquid pressures of the four vehicles are all from the same brake master pump.
At present, when a new energy vehicle is braked, certain braking energy recovery needs to be carried out, so that the cruising range of the vehicle can be increased, in order to provide the target of formulating the energy recovery, a manufacturer of an electronic booster usually realizes decoupling of a brake pedal and a master cylinder through designing certain idle stroke on a boosting structure, and because decoupling gaps exist between a push rod of the pedal and an ejector rod of the master cylinder, when the brake pedal is stepped on, pedal force cannot be directly transmitted to the master cylinder, when a braking request is received, firstly, reverse torque braking of a vehicle power motor is taken as a main braking force source, and hydraulic braking is taken as supplement of insufficient braking force. For example, in patent No. 201711059529.0, "an electric brake booster for automobile" the electric booster of decoupling structure is because of the existence of idle stroke, so driver's pedal feel experience is not very good when braking, and in order to solve the problem of pedal feel, the producer will install the simulation spring again in brake pedal push rod position, for example, in patent No. 201910769731.5, "a pedal simulator" the decoupling of simulation is although can improve certain pedal feel, nevertheless because the spring rigidity can not be adjusted according to the operating mode of vehicle in a product.
When the four wheels are all provided with the electronic brake calipers, when the electronic control system fails and no mechanical brake is used as a backup, the vehicle can lose the braking capability and is in an unsafe state. In a traditional four-wheel full hydraulic system, a parking mechanism is additionally added for parking braking.
Disclosure of Invention
The invention aims to provide a novel electro-hydraulic combined braking system which is convenient for braking energy recovery and safe backup braking.
The technical purpose of the invention is realized by the following technical scheme:
a novel electro-hydraulic combined braking system comprises two hydraulic braking calipers arranged on a front/rear shaft of a vehicle and two electronic braking calipers arranged on the rear/front shaft of the vehicle;
the hydraulic brake caliper is connected with a hydraulic pump for providing hydraulic pressure, and the hydraulic pump is connected with a power assisting motor for providing power assisting;
the electronic brake caliper comprises an electronic brake motor for providing power;
the power-assisted motor and the electronic brake motor are both connected to a controller BCU, and the controller BCU controls the power-assisted motor and the brake motor to run.
Furthermore, the controller BCU comprises a first MCU, a second MCU and a third MCU which are communicated with each other, and the first MCU controls the power-assisted motor to operate;
the second MCU and the third MCU respectively control the two electronic brake motors to operate, and the electronic brake motors provide power for the corresponding electronic brake calipers.
Furthermore, the hydraulic brake caliper system and the electronic brake caliper system adopt a double CAN control loop and comprise independent CAN1 and CAN2, the CAN1 is connected with the first MCU, and the CAN2 is connected with the second MCU and the third MCU.
Further, the electronic caliper is mounted to the drive shaft and the hydraulic caliper is mounted to another shaft.
Furthermore, the two hydraulic brake calipers have the same size specification, and the two electronic brake calipers have the same size specification and power; the electronic brake caliper comprises an electronic brake motor, a gear transmission mechanism and a ball screw mechanism used for pushing a caliper piston under the action of the electronic brake motor; after receiving a control instruction of the controller BCU, the electronic brake motor decelerates and increases torque through the gear transmission mechanism, and finally the ball screw mechanism pushes out force on the caliper piston to generate friction braking.
Further, the electronic brake caliper comprises a parking locking mechanism, and the locking mechanism is a wedge-shaped structure; when in work, the gear is directly locked into the gear groove part; when the vehicle needs to drive away, the locking mechanism is controlled by the controller BCU, and can be unlocked automatically.
The invention also aims to provide a braking method based on the novel electro-hydraulic combined braking system in claim 1, which comprises the following steps:
s10: when a driver has a braking request to step on a brake pedal, a pedal displacement sensor senses the depth of the step on the brake pedal, and a BCU calculates to obtain the magnitude of the braking force request; the front axle hydraulic brake caliper controls the power assistance of the power-assisted motor according to the controller BCU to control the braking torque of the front axle, and the control principle of the hydraulic braking force is that wheels are not locked;
s20: when the reverse torque which can be provided by the vehicle driving motor is larger than the braking request torque, the rear axle electronic brake caliper does not act, and the vehicle driving motor generates power by the reverse torque to generate braking torque, so that the braking energy recovery of the vehicle is realized;
s30: when the required braking torque is larger than the braking of the driving motor, the hydraulic brake caliper, the electronic brake caliper and the driving motor are used for braking to distribute braking force according to the command of the controller, and meanwhile, the requirements of vehicle braking and speed reduction and energy recovery are met.
Further, in step S10, while the hydraulic brake is performed;
if the wheel slip rate is smaller than the locking threshold value, the step S20 is carried out, feedback braking is carried out, and energy is recovered;
and if the braking torque is smaller than the braking request, performing braking by the electronic brake caliper and performing anti-lock control.
Further, the anti-lock control includes:
when the vehicle brakes, the controller BCU collects wheel speed signals of the left and right rear wheels;
when a certain rear wheel is locked or tends to be locked, the controller BCU controls the torque output size and the corner position of the motor of the electronic brake caliper so as to realize the regulation and control of the braking force size;
when one wheel has a locking tendency, the motor on the side is output with small torque, and the braking force is reduced, thereby realizing the anti-lock control of the rear wheel.
Furthermore, when the power-assisted motor or the control circuit fails, backup braking in a non-power-assisted state is realized, and the thrust generated by directly stepping on the brake pedal by a driver acts on the piston of the hydraulic pump to generate brake hydraulic pressure so as to safely decelerate or stop the vehicle;
when the hydraulic circuit fails, braking is carried out through an electronic brake caliper;
when no driver operates the brake pedal, the hydraulic brake caliper realizes active pressurization braking through an assisting motor of a brake pump, and the electronic brake caliper realizes active braking through the action of an electronic brake motor.
In conclusion, the invention has the following beneficial effects:
through the arrangement mode of a rear axle electronic brake caliper (or a front axle electronic brake caliper and a rear axle hydraulic brake caliper) of the front axle hydraulic brake caliper, when an electric control system fails, mechanical braking can be used as backup, a vehicle cannot lose braking capacity, safety is improved, and the parking brake caliper is an integrated caliper of service braking and parking braking, and a mechanical structure is adopted as a parking locking mechanism, so that the position of the electronic brake caliper can be completely locked after the electronic brake caliper is powered off, and the parking state of the vehicle is kept;
can improve the efficiency of energy recovery to the maximum extent, can meet the requirement of vehicle braking and deceleration and exert the energy recovery capability to the maximum extent,
the 3 MCUs can respectively realize independent action and non-action of each motor, wherein any one or two motors fail, and the rest motors can completely and normally play a role, so that multi-level safety redundancy is formed, and the safety of the vehicle is ensured;
when the power-assisted motor or the control circuit fails, backup braking in a non-power-assisted state can be realized, the thrust generated by the driver stepping on the brake pedal directly acts on a brake pump piston to generate brake hydraulic pressure, so that the vehicle is safely decelerated or stopped, multi-stage backup braking is realized, and when a hydraulic circuit fails, the electronic brake caliper can also brake, so that the safety performance is higher;
the anti-lock function of the rear wheels of the vehicle can be realized, so that the anti-lock control of the rear wheels can be realized, and the function of the ABS of the automobile can be basically realized;
two CAN control loops are adopted, and two power supplies are configured at the same time; the hydraulic brake caliper system and the electronic brake caliper system respectively use independent CAN networks (CAN 1 and CAN 2), any path of failure and the other path of failure CAN also realize the communication between the brake system and the whole vehicle, for example, when only CAN1 fails, the front axle hydraulic pump power-assisted brake system CAN not realize motor control, and at the moment, the rear axle electronic brake caliper system CAN completely realize brake; the two independent power supplies are configured, so that safe redundant control of the power supplies in power failure can be prevented.
Drawings
FIG. 1 is a schematic diagram of an electro-hydraulic combination brake system layout circuit of the present invention;
FIG. 2 is a schematic diagram of a system connection circuit in the present invention;
fig. 3 is a flowchart of a system control method in the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings, and the present embodiment is not to be construed as limiting the invention.
A novel electro-hydraulic combined braking system is shown in figure 1 and comprises two hydraulic brake calipers arranged on a front/rear axle of a vehicle and two electronic brake calipers arranged on a rear/front axle of the vehicle. Specifically, in order to cooperate with braking energy recovery, an electronic brake caliper is mounted on a driving shaft, and a hydraulic brake caliper is mounted on the other shaft;
as shown in fig. 1, i.e., when the vehicle power motor is mounted on the front axle, i.e., the front drive of the vehicle, the electronic brake caliper is mounted on the front axle and the hydraulic brake caliper is mounted on the rear axle;
when a vehicle power motor is arranged on a rear axle, namely vehicle rear drive, an electronic brake caliper is arranged on a rear axle, and a hydraulic brake caliper is arranged on a front axle, so that when braking energy recovery is needed, the electronic brake caliper does not act, and the driving motor generates power by reverse torque;
in the present embodiment, for example, a rear-drive vehicle, a hydraulic brake caliper is mounted on the front axle, and an electronic brake caliper is mounted on the rear axle.
As shown in fig. 1, the hydraulic brake caliper is connected to a hydraulic pump for providing hydraulic pressure through a hydraulic pipeline, and the hydraulic pump is connected with a power-assisted motor for providing power assistance; the electronic brake caliper comprises an electronic brake motor for providing power; the power-assisted motor and the electronic brake motor are both connected to the controller BCU, and the controller BCU controls the operation of the power-assisted motor and the brake motor. The power-assisted motor unit provides power assistance for a brake pedal operator when building pressure for the hydraulic pump, so that the brake pressure and the corresponding speed can be improved, and the brake distance is shortened.
As shown in fig. 1, the motor assisting unit includes an assisting motor and a pedal position sensor, the pedal position sensor is mounted on a pedal push rod and can sense the depth and speed of a driver stepping on a brake pedal, so that different control strategy bases can be provided for a controller and used for controlling the action of the assisting motor and the work of a rear axle electronic brake caliper, the pedal displacement is large, namely the braking torque request of the driver is large, the clamping force output of the hydraulic brake caliper and the electronic brake caliper is also large, and a vehicle can obtain a large braking deceleration.
As shown in fig. 1 and 2, the controller BCU includes a first MCU, a second MCU, and a third MCU, which communicate with each other, and the first MCU controls the operation of the power-assisted motor; the second MCU and the third MCU respectively control the two electronic brake motors to operate, and the electronic brake motors provide power for the corresponding electronic brake calipers. Controller BCU installs on vehicle chassis and or in the cockpit, but is not limited to above two kinds of positions, and controller shell design has waterproof dustproof sealing washer, and three motor work of this controller simultaneous control, and calorific capacity is more, and the outside design of casing has still has the heat dissipation muscle piece.
As shown in fig. 2, the controller BCU controls the brake pump booster motor and the left and right rear wheel electric brake motors individually through the internal 3-way circuit and the microcomputer MCU, so that each motor can act and not act individually, and when any one or two of the motors fail, the remaining motors can fully function normally, thus ensuring safety of the vehicle with multi-level safety redundancy.
As shown in FIG. 2, the hydraulic brake caliper system and the electronic brake caliper system adopt a double CAN control loop, and comprise independent CAN1 and CAN2, wherein the CAN1 is connected with the first MCU, and the CAN2 is connected with the second MCU and the third MCU. Through the double CAN control loops, two power supplies are simultaneously configured, the hydraulic brake caliper system and the electronic brake caliper system respectively use independent CAN networks (CAN 1 and CAN 2), any failure way and the other failure way CAN also realize the communication of the brake system and the whole vehicle, for example, when only CAN1 fails, the front axle hydraulic pump power-assisted brake system CAN not realize motor control, and at the moment, the rear axle electronic brake caliper system CAN completely realize brake; the two independent power supplies are configured, so that safe redundant control of the power supplies in power failure can be prevented.
As shown in fig. 1, a hydraulic caliper is mounted on a front axle of a vehicle, respectively disposed at left and right front wheels. The two hydraulic brake calipers are of the same size and specification, hydraulic pressure required by the work of the two hydraulic brake calipers is from the same hydraulic pump, the hydraulic brake calipers are the same as the traditional hydraulic brake calipers in structure and principle, the pistons of the brake calipers are pushed by hydraulic pressure, the friction plates are pushed by the pistons to clamp the brake disc, and the hydraulic brake calipers can be single pistons or double pistons.
The invention emphasizes that the hydraulic brake caliper can directly use the traditional brake caliper without new development, shortens the development period of a system and reduces the cost, and the diameter of a piston of the hydraulic brake caliper can be flexibly designed according to the matching of the braking force of a vehicle.
As shown in figure 1, the hydraulic pump is a single-cavity hydraulic pump and is provided with motor power, the liquid outlets of the hydraulic pump are respectively connected to two hydraulic brake calipers, the cost is simpler than that of a traditional double-cavity brake pump, the cost is low, when a driver needs to brake, the motor power assisting unit provides power for the hydraulic pump, the driver is labor-saving when stepping on a brake pedal, and meanwhile, the brake response rate can be improved.
As shown in fig. 1, the electronic caliper is mounted on a rear axle of a vehicle, respectively disposed at left and right rear wheels. The two electronic brake calipers have the same size and power so as to ensure that the left wheel and the right wheel output the same braking torque under the same current; the electronic brake caliper comprises an electronic brake motor, a gear transmission mechanism and a ball screw mechanism used for pushing a caliper piston under the action of the electronic brake motor;
the gear transmission mechanism adopts planetary gear transmission, in order to prolong the service life, powder metallurgy materials are used for replacing engineering plastics, a piston push-out structure of the caliper adopts a ball screw structure, an electronic brake caliper motor can be a brush motor or a brushless motor, the brushless motor is preferentially adopted to prolong the service life, the ball screw structure can be a single-head screw or a multi-head screw, and the electronic brake caliper does not need to be filled with liquid during working;
as shown in fig. 1, after receiving a control instruction of the controller BCU, the electric brake motor decelerates and increases torque through the gear transmission mechanism, and finally, the ball screw mechanism applies pushing force to the caliper piston to generate friction braking.
The electronic brake caliper comprises a parking locking mechanism, and is a service brake and parking brake integrated caliper, and the locking mechanism is of a wedge-shaped structure; when in work, the gear is directly locked into the gear groove part; when the vehicle needs to drive away, the locking mechanism is controlled by the controller BCU, and can be unlocked automatically. The parking locking mechanism adopts a mechanical structure, so that the position of the electronic caliper can be completely locked after the electronic caliper is powered off, and the parking state of the vehicle is kept.
When the power-assisted motor or the control circuit fails, backup braking in a non-power-assisted state is realized, and the thrust generated by directly stepping on a brake pedal by a driver acts on a piston of the hydraulic pump to generate brake hydraulic pressure so as to safely decelerate or stop the vehicle;
when the hydraulic circuit fails, braking is carried out through an electronic brake caliper;
the brake device is popularized and applied to unmanned vehicles to realize braking of front and rear shafts, namely when no driver operates a brake pedal, the hydraulic brake caliper realizes active pressurized braking through a power-assisted motor of a brake pump, and the electronic brake caliper realizes active braking through the action of an electronic brake motor. The controller CAN receive the commands of the vehicle VCU to respectively control the work of the three motors, and the control commands are generally transmitted through a CAN line.
As shown in fig. 3, the braking method of the novel electro-hydraulic combined braking system provided by the invention can cooperate with a new energy vehicle driving motor to perform reverse drag braking torque braking, so as to realize braking energy recovery of the vehicle, and store electric energy generated by the driving motor into a battery through a vehicle battery management system, and comprises the following steps:
s10: when a driver has a braking request to tread a brake pedal, a pedal displacement sensor senses the depth of the tread of the brake pedal, the magnitude of the pedal displacement directly indicates the depth of the brake pedal treaded by the driver, the magnitude of the braking force request indirectly indicates the magnitude of the braking force request, and the magnitude of the braking force request is calculated through a controller BCU; the front axle hydraulic brake caliper controls the power assistance of the power-assisted motor according to the controller BCU to control the braking torque of the front axle, and the control principle of the hydraulic braking force is that wheels are not locked;
s11: when hydraulic braking is carried out, if the wheel slip rate is smaller than the locking threshold value, the step S20 is carried out, feedback braking is carried out, and energy is recovered;
if the braking torque is smaller than the braking request, performing braking by the electronic brake caliper, and executing step S12 to perform anti-lock control;
s12: the anti-lock control includes: when the vehicle brakes, the controller BCU collects wheel speed signals of the left and right rear wheels;
when a certain rear wheel is locked or tends to be locked, the controller BCU controls the torque output size and the corner position of the electronic brake motor, so that the regulation and control of the braking force size are realized;
when one side of the wheels has a locking tendency, the electronic brake motor on the side is output with small torque, the braking force is reduced, and the anti-lock control of the rear wheels is realized.
S20: when the reverse torque which can be provided by the vehicle driving motor is larger than the braking request torque, the rear axle electronic brake caliper does not act and does not generate friction braking, and the vehicle driving motor generates power by the reverse torque to generate braking torque so as to realize the recovery of the braking energy of the vehicle; the front axle hydraulic brake caliper controls the magnitude of the front axle braking torque through the controller BCU, so that the driving motor can exert the maximum braking effect, and the efficiency of energy recovery is improved to the maximum extent;
s30: when the required braking torque is larger than the braking of the driving motor, the hydraulic brake caliper, the electronic brake caliper and the driving motor are used for braking to distribute braking force according to the command of the controller, and meanwhile, the requirements of vehicle braking and speed reduction and energy recovery are met.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a novel electricity liquid combination braking system which characterized in that: the brake comprises two hydraulic brake calipers arranged on a front/rear shaft of a vehicle and two electronic brake calipers arranged on the rear/front shaft of the vehicle;
the hydraulic brake caliper is connected with a hydraulic pump for providing hydraulic pressure, and the hydraulic pump is connected with a power assisting motor for providing power assisting;
the electronic brake caliper comprises an electronic brake motor for providing power;
the power-assisted motor and the electronic brake motor are both connected to a controller BCU, and the controller BCU controls the power-assisted motor and the brake motor to run.
2. The novel electro-hydraulic combined brake system according to claim 1, characterized in that: the controller BCU comprises a first MCU, a second MCU and a third MCU which are communicated with each other, and the first MCU controls the power-assisted motor to operate;
the second MCU and the third MCU respectively control the two electronic brake motors to operate, and the electronic brake motors provide power for the corresponding electronic brake calipers.
3. The novel electro-hydraulic combined brake system according to claim 2, characterized in that:
the hydraulic brake caliper system and the electronic brake caliper system adopt double CAN control loops and comprise independent CAN1 and CAN2, the CAN1 is connected with the first MCU, and the CAN2 is connected with the second MCU and the third MCU.
4. A novel electro-hydraulic combination brake system according to claim 1 or 3, characterized in that: an electronic caliper is mounted to the drive shaft and a hydraulic caliper is mounted to the other shaft.
5. The novel electro-hydraulic combined brake system according to claim 1, characterized in that: the two hydraulic brake calipers are in the same size specification, and the two electronic brake calipers are in the same size specification and power; the electronic brake caliper comprises an electronic brake motor, a gear transmission mechanism and a ball screw mechanism used for pushing a caliper piston under the action of the electronic brake motor; after receiving a control instruction of the controller BCU, the electronic brake motor decelerates and increases torque through the gear transmission mechanism, and finally the ball screw mechanism pushes out force on the caliper piston to generate friction braking.
6. The novel electro-hydraulic combination brake system according to claim 1 or 5, characterized in that: the electronic brake caliper comprises a parking locking mechanism, and the locking mechanism is a wedge-shaped structure; when in work, the gear is directly locked into the gear groove part; when the vehicle needs to drive away, the locking mechanism is controlled by the controller BCU, and can be unlocked automatically.
7. A braking method based on the novel electro-hydraulic combined braking system as claimed in claim 1, characterized in that:
the method comprises the following steps:
s10: when a driver has a braking request to step on a brake pedal, a pedal displacement sensor senses the depth of the step on the brake pedal, and a BCU calculates to obtain the magnitude of the braking force request; the front axle hydraulic brake caliper controls the power assistance of the power-assisted motor according to the controller BCU to control the braking torque of the front axle, and the control principle of the hydraulic braking force is that wheels are not locked;
s20: when the reverse torque which can be provided by the vehicle driving motor is larger than the braking request torque, the rear axle electronic brake caliper does not act, and the vehicle driving motor generates power by the reverse torque to generate braking torque, so that the braking energy recovery of the vehicle is realized;
s30: when the required braking torque is larger than the braking of the driving motor, the hydraulic brake caliper, the electronic brake caliper and the driving motor are used for braking to distribute braking force according to the command of the controller, and meanwhile, the requirements of vehicle braking and speed reduction and energy recovery are met.
8. The novel electro-hydraulic combined braking method according to claim 7, characterized in that: in step S10, hydraulic braking is performed;
if the wheel slip rate is smaller than the locking threshold value, the step S20 is carried out, feedback braking is carried out, and energy is recovered;
and if the braking torque is smaller than the braking request, performing braking by the electronic brake caliper and performing anti-lock control.
9. The novel electro-hydraulic combined braking method according to claim 8, characterized in that: the anti-lock control includes:
when the vehicle brakes, the controller BCU collects wheel speed signals of the left and right rear wheels;
when a certain rear wheel is locked or tends to be locked, the controller BCU controls the torque output size and the corner position of the motor of the electronic brake caliper so as to realize the regulation and control of the braking force size;
when one wheel has a locking tendency, the motor on the side is output with small torque, and the braking force is reduced, thereby realizing the anti-lock control of the rear wheel.
10. The novel electro-hydraulic combined braking method according to claim 7, characterized in that:
when the power-assisted motor or the control circuit fails, backup braking in a non-power-assisted state is realized, and the thrust generated by directly stepping on a brake pedal by a driver acts on a piston of the hydraulic pump to generate brake hydraulic pressure so as to safely decelerate or stop the vehicle;
when the hydraulic circuit fails, braking is carried out through an electronic brake caliper;
when no driver operates the brake pedal, the hydraulic brake caliper realizes active pressurization braking through an assisting motor of a brake pump, and the electronic brake caliper realizes active braking through the action of an electronic brake motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010787641.1A CN111907500A (en) | 2020-08-07 | 2020-08-07 | Novel electro-hydraulic combined braking system and braking method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010787641.1A CN111907500A (en) | 2020-08-07 | 2020-08-07 | Novel electro-hydraulic combined braking system and braking method thereof |
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| CN112622848A (en) * | 2020-12-24 | 2021-04-09 | 奇瑞汽车股份有限公司 | Brake-by-wire system and car |
| CN113933069A (en) * | 2021-11-22 | 2022-01-14 | 中国第一汽车股份有限公司 | Method and system for testing liquid amount required by brake caliper |
| CN114872668A (en) * | 2022-05-31 | 2022-08-09 | 中国第一汽车股份有限公司 | Vehicle control method, device, electronic device and storage medium |
| CN115195485A (en) * | 2022-09-13 | 2022-10-18 | 达芬骑动力科技(北京)有限公司 | Vehicle power recovery method and system and vehicle |
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