CN211918640U - Integrated electronic hydraulic brake system - Google Patents
Integrated electronic hydraulic brake system Download PDFInfo
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- CN211918640U CN211918640U CN202020632822.2U CN202020632822U CN211918640U CN 211918640 U CN211918640 U CN 211918640U CN 202020632822 U CN202020632822 U CN 202020632822U CN 211918640 U CN211918640 U CN 211918640U
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Abstract
The utility model discloses an integrated form electronic hydraulic braking system, including the liquid storage pot, the brake master cylinder, electronic pressure jar of building, footboard sensation simulator, hydraulic control unit and electrical control unit, wherein the liquid storage pot, the brake master cylinder, electronic pressure jar of building, footboard sensation simulator, hydraulic control unit and electrical control unit integration are an overall structure, the liquid storage pot is close to the installation of brake master cylinder and is linked together with the brake master cylinder, the assembly of brake master cylinder is in hydraulic control unit, electrical control unit establishes the upper portion at hydraulic control unit, electronic pressure jar of building passes electrical control unit and also assembles the upper portion at hydraulic control unit, footboard sensation simulator sets up the one side at hydraulic control unit, the liquid storage pot assembles the opposite side at hydraulic control unit. Has the advantages that: a sufficient brake pressure can be established in a short time. The brake system has the functions of active braking, failure backup, braking energy recovery and the like.
Description
Technical Field
The utility model relates to a hydraulic braking system, in particular to integrated form electron hydraulic braking system.
Background
At present, with the continuous development of automobile intellectualization and electromotion technology, the traditional vacuum boosting brake system is difficult to meet the requirements of intelligent automobiles and electric automobiles on the brake system. The intelligent automobile requires a brake system to have more accurate brake pressure control capability, faster response speed and enough active brake capability, and the intelligent automobile can be used as a bottom-layer actuator of the intelligent driving auxiliary system only under the conditions. The electric automobile requires that the brake system has certain decoupling capacity, namely decoupling of brake pedal force and motor assistance, so that the brake system can be matched with regenerative braking, the brake energy is recovered to the maximum extent, the endurance mileage of the electric automobile is improved, and the automobile is ensured to have good pedal feeling while the brake energy is recovered.
However, at present, many electronic hydraulic brake systems still adopt a structure of a high-pressure energy accumulator and a motor pump to control hydraulic braking force, but the high-pressure energy accumulator has a complex structure and long response time, and is afraid of vibration, so that the high-pressure energy accumulator has the hidden trouble of liquid leakage, large volume, high cost and expensive maintenance cost; the common electric power-assisted braking system generally adopts a scheme of decoupling or partial decoupling, the decoupling capability is limited, the regenerative braking capability of the electric automobile cannot be fully exerted, and the braking energy is recovered to the maximum extent; the pedal force of a driver and the electric power assistance are usually coupled by adopting a reaction disc, and the problems of deformation of the inner ring and the outer ring of the reaction disc and the like need to be considered when a control algorithm is designed, so that the control algorithm is complicated; in addition, some electronic hydraulic brake systems adopting a complete decoupling scheme are generally designed into a split structure, including a motor and transmission mechanism assembly, a master cylinder assembly, a pedal feel simulator assembly, a hydraulic control unit HCU and the like, and the split structure causes the system to be complex, hydraulic pipelines to be difficult to arrange and the system to be inconvenient to install on a real vehicle.
Disclosure of Invention
The utility model aims at solving the problem that the system that present electronic hydraulic braking system adopts the components of a whole that can function independently structure to lead to is complicated, hydraulic line arranges the difficulty and installs inconvenience on the real car, and the integrated form electronic hydraulic braking system who provides.
The utility model provides an integrated form electronic hydraulic braking system is including the liquid storage pot, the brake master cylinder, electronic pressure jar of building, footboard sensation simulator, hydraulic control unit and electrical control unit, wherein the liquid storage pot, the brake master cylinder, electronic pressure jar of building, footboard sensation simulator, hydraulic control unit and electrical control unit integration are an overall structure, the liquid storage pot is close to the installation of brake master cylinder and is linked together with the brake master cylinder, the assembly of brake master cylinder is in hydraulic control unit, electrical control unit establishes the upper portion at hydraulic control unit, electronic pressure jar of building passes electrical control unit also and assembles the upper portion at hydraulic control unit, footboard sensation simulator sets up the one side at hydraulic control unit, the liquid storage pot assembles the opposite side at hydraulic control unit.
A first piston and a second piston are arranged in the brake master cylinder, a first working chamber is formed between the first piston and the second piston, a second working chamber is formed at the bottom of the inner chamber of the brake master cylinder and the second piston, a first return spring is arranged in the first working chamber, a second return spring is arranged in the second working chamber, the first working chamber and the second working chamber are both communicated with a liquid storage tank, hydraulic oil is filled in the first working chamber and the second working chamber, the outer end of the first piston is connected with a pedal push rod, the outer end of the pedal push rod is hinged with a brake pedal, a stroke sensor is arranged on the pedal push rod and is connected with an electric control unit, the stroke sensor can transmit displacement data of the pedal push rod to the electric control unit in real time, the first working chamber is connected with a first infusion pipeline and a second infusion pipeline, and is communicated with the inner chamber of the pedal feeling simulator through the first infusion pipeline, the first infusion pipeline is connected with a first electromagnetic valve, the first infusion pipeline is further connected with two branches, a throttle valve is arranged on one branch, a first check valve is arranged on the other branch, a second electromagnetic valve is connected on the second infusion pipeline, the second working cavity is connected with a third infusion pipeline, a hydraulic sensor and a third electromagnetic valve are sequentially connected on the third infusion pipeline, the hydraulic sensor is connected with an electric control unit, the hydraulic sensor can transmit collected data to the electric control unit in real time, and the first electromagnetic valve, the throttle valve, the first check valve, the second electromagnetic valve and the third electromagnetic valve are all connected with the electric control unit and controlled to work by the electric control unit.
The first electromagnetic valve is a linear valve, the second electromagnetic valve and the third electromagnetic valve are two-position three-way electromagnetic valves, wherein the front end opening of the second electromagnetic valve is communicated with the outlet of the second liquid conveying pipeline, and the front end opening of the third electromagnetic valve is communicated with the outlet of the third liquid conveying pipeline.
The pedal feel simulator comprises a pedal feel simulator and is characterized in that a third piston is arranged in an inner cavity of the pedal feel simulator, a simulator front cavity is arranged on the left side of the third piston, a simulator rear cavity is arranged on the right side of the third piston, the simulator front cavity and the simulator rear cavity are filled with hydraulic oil, the simulator front cavity is communicated with a first working cavity in a brake master cylinder through a first liquid conveying pipeline, a third return spring is assembled in the simulator rear cavity, the simulator rear cavity is further connected with a first liquid return pipeline, a liquid outlet of the first liquid return pipeline is communicated with the first working cavity in the brake master cylinder, a fourth electromagnetic valve is connected onto the first liquid return pipeline and is a switch valve, and the fourth electromagnetic valve is connected with an electric control unit and works under the control of the electric control unit.
One end of the electric pressure building cylinder is provided with a motor, a fourth piston is arranged in an inner cavity of the electric pressure building cylinder, an output shaft of the motor is a lead screw, the lead screw is inserted in the fourth piston and forms a ball screw structure with the fourth piston, the fourth piston can be driven to move in the inner cavity of the electric pressure building cylinder by the rotation of the motor, a rotor of the motor is provided with a corner sensor, the corner sensor is connected with an electric control unit, the collected data can be transmitted to the electric control unit in real time by the corner sensor, the motor is connected with the electric control unit and is controlled by the electric control unit to work, a third working cavity is formed at the free end of the fourth piston and the bottom of the electric pressure building cylinder, the third working cavity is filled with hydraulic oil, the third working cavity is connected with a fourth infusion pipeline, the fourth infusion pipeline is connected with two branches, one branch is provided with a fifth electromagnetic, the fifth electromagnetic valve is a switch valve, the sixth electromagnetic valve is a linear valve, the sixth electromagnetic valve is in a normally open position in a power-off state, the fifth electromagnetic valve is in a normally closed position, the fifth electromagnetic valve and the sixth electromagnetic valve are both connected with the electric control unit and controlled by the electric control unit to work, a liquid outlet of the fourth infusion pipeline is divided into two outlets, the first outlet is connected with a front end closed port of the second electromagnetic valve, and the second outlet is connected with a front end closed port of the third electromagnetic valve.
A liquid outlet of the second electromagnetic valve is connected with a fifth liquid conveying pipeline, the fifth liquid conveying pipeline is connected with two branch pipes, one branch pipe is sequentially provided with a first liquid inlet valve and a first liquid outlet valve, a pipeline between the first liquid inlet valve and the first liquid outlet valve is connected with a first brake wheel cylinder, the other branch pipe is sequentially provided with a second liquid inlet valve and a second liquid outlet valve, a pipeline between the second liquid inlet valve and the second liquid outlet valve is connected with a second brake wheel cylinder, a liquid outlet of the third electromagnetic valve is connected with a sixth liquid conveying pipeline, the sixth liquid conveying pipeline is connected with two branch pipes, one branch pipe is sequentially provided with a third liquid inlet valve and a third liquid outlet valve, a pipeline between the third liquid inlet valve and the third liquid outlet valve is connected with a third brake wheel cylinder, the other branch pipe is sequentially provided with a fourth liquid inlet valve and a fourth liquid outlet valve, and a pipeline between the fourth liquid inlet valve and the fourth liquid outlet valve is connected with a fourth brake wheel cylinder, the fifth transfusion pipeline and the sixth transfusion pipeline are connected with a second liquid return pipeline after being converged, a liquid outlet of the second liquid return pipeline is communicated with a third working cavity in the electric pressure building cylinder, a second one-way valve is arranged on the second liquid return pipeline, and the first liquid inlet valve, the first liquid outlet valve, the second liquid inlet valve, the second liquid outlet valve, the third liquid inlet valve, the third liquid outlet valve, the fourth liquid inlet valve, the fourth liquid outlet valve and the second one-way valve are all connected with the electric control unit and controlled by the electric control unit to work.
The electric control unit is an ECU.
The hydraulic control unit consists of a first electromagnetic valve, a throttle valve, a first one-way valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve, a first liquid inlet valve, a first liquid outlet valve, a second liquid inlet valve, a second liquid outlet valve, a third liquid inlet valve, a third liquid outlet valve, a fourth liquid inlet valve, a fourth liquid outlet valve and a second one-way valve, wherein the first electromagnetic valve, the throttle valve, the first one-way valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the first liquid inlet valve, the first liquid outlet valve, the second liquid inlet valve, the second liquid outlet valve, the third liquid inlet valve, the third liquid outlet valve, the fourth liquid outlet valve and the second one-way valve are all integrated in the hydraulic control unit, and the first infusion pipeline, the second infusion pipeline, the third infusion pipeline, the fourth infusion pipeline, the fifth infusion pipeline, the sixth infusion pipeline and the third liquid return pipeline, The second liquid return pipelines are integrated in the hydraulic control unit, and the brake master cylinder is also integrated in the hydraulic control unit.
The electric control unit, the stroke sensor, the hydraulic sensor, the motor, the first electromagnetic valve, the throttle valve, the first check valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the first liquid inlet valve, the first liquid outlet valve, the second liquid inlet valve, the second liquid outlet valve, the third liquid inlet valve, the third liquid outlet valve, the fourth liquid inlet valve, the fourth liquid outlet valve and the second check valve are all the equipment of the existing equipment, therefore, specific models and specifications are not repeated.
The utility model discloses a theory of operation:
the utility model provides a complete decoupling zero's of integrated form electron hydraulic braking system, including conventional braking, initiative braking and three kinds of mode of backup failure, the particular case is as follows:
first case, normal braking mode:
when the system is in a conventional braking mode, a driver steps on a brake pedal, a first piston is pushed through a pedal push rod, hydraulic oil in a first working cavity is pressed into a simulator front cavity of a pedal feel simulator through a first liquid conveying pipeline and a first electromagnetic valve, a third piston is pushed to overcome the resistance of a third return spring, the third return spring simulates pedal feel, and the hydraulic oil flows out through a pore channel in the outer wall of the pedal feel simulator and then flows back to the first working cavity in the inner cavity of the brake master cylinder through a first liquid return pipeline and a fourth electromagnetic valve. The pedal feeling is simulated mainly by the first return spring and the third return spring in the process.
Meanwhile, a stroke sensor arranged on a pedal push rod detects a pedal displacement signal and transmits the pedal displacement signal to an electric control unit in real time, the electric control unit controls a motor rotor to operate according to a control algorithm, a motor output shaft converts rotation into translation of a fourth piston through a ball screw structure, and the fourth piston extrudes hydraulic oil in a third working cavity to build pressure for a fourth brake wheel cylinder and a third brake wheel cylinder through a fourth fluid conveying pipeline, a sixth electromagnetic valve, a third electromagnetic valve, a sixth fluid conveying pipeline, a fourth fluid inlet valve and a third fluid inlet valve; and the other route builds pressure for the second brake wheel cylinder and the first brake wheel cylinder through a fourth liquid conveying pipeline, a fifth electromagnetic valve, a second electromagnetic valve, a fifth liquid conveying pipeline, a second liquid inlet valve and a first liquid inlet valve.
When a driver looses the brake pedal, the first piston returns through the first return spring, the third piston returns through the third return spring, and the fourth piston returns in a reverse direction through the motor.
Under a conventional braking mode, the braking system is in a complete decoupling state, at the moment, the braking pedal force applied by a driver is completely decoupled with the motor assistance, the driver only provides information such as required pedal travel and the like and does not participate in an actual braking process, the actual braking force is completely provided by regenerative braking and an electric pressure building cylinder, the regenerative braking force of a vehicle can be fully exerted, and the braking energy is recovered to the maximum extent.
Second case, active braking mode:
when a driver does not step on a brake pedal, if a vehicle-mounted environment sensing sensor (such as a speed measuring sensor, a distance measuring sensor, a camera, a radar and the like) measures that the distance between the vehicle and a front obstacle is too short, an electronic control unit receives information and judges that braking measures are needed to be taken to prevent collision or other dangerous working conditions, and an electronic hydraulic system enters an active braking mode.
In the active braking mode, the electric control unit analyzes signals transmitted by other vehicle-mounted sensors, judges the active braking force required by the vehicle and controls the motor to operate through the control circuit. An output shaft of the motor drives the ball screw mechanism to rotate, the rotation of the motor is converted into the translation of a fourth piston through the ball screw mechanism, and the fourth piston extrudes hydraulic oil in a third working cavity to build pressure for a fourth brake wheel cylinder and a third brake wheel cylinder through a fourth liquid conveying pipeline, a sixth electromagnetic valve, a third electromagnetic valve, a sixth liquid conveying pipeline, a fourth liquid inlet valve and a third liquid inlet valve; and the other route builds pressure for the second brake wheel cylinder and the first brake wheel cylinder through a fourth liquid conveying pipeline, a fifth electromagnetic valve, a second electromagnetic valve, a fifth liquid conveying pipeline, a second liquid inlet valve and a first liquid inlet valve, so that the drive-by-wire active braking is realized.
Third case, failure backup mode:
according to relevant regulations, when a brake system fails or some brake components are in failure, the brake system still needs to ensure that a certain brake strength can be generated so as to ensure safety and reliability.
The utility model provides an electronic hydraulic braking system of complete decoupling zero of integrated form when motor or certain driving medium break down, all solenoid valves are in the outage state, as shown in the figure, and first solenoid valve is in normally closed state. A driver steps on a brake pedal to build pressure for the first working cavity and the second working cavity, and hydraulic oil in the first working cavity builds pressure for the second brake wheel cylinder and the first brake wheel cylinder through the second infusion pipeline, the second electromagnetic valve, the fifth infusion pipeline, the second liquid inlet valve and the first liquid inlet valve; and hydraulic oil in the second working cavity builds pressure for the fourth brake wheel cylinder and the third brake wheel cylinder through the third infusion pipeline, the third electromagnetic valve, the sixth infusion pipeline, the fourth liquid inlet valve and the third liquid inlet valve so as to realize the failure backup function.
The utility model has the advantages that:
the utility model provides an integrated electronic hydraulic brake system, which integrates a motor and a transmission mechanism assembly, a main cylinder assembly, a pedal feeling simulator assembly, a hydraulic control unit and the like into an integrated structure, and reduces the complexity of the system; the pedal force of a driver and the assistance of the motor are completely decoupled, and the regenerative braking capacity of the electric automobile can be fully exerted. In a conventional braking mode, a pedal feeling simulator is adopted to simulate pedal feeling, so that a driver is ensured to have pedal feeling similar to that of a traditional vacuum power-assisted braking system; the motor drive and the ball screw transmission are adopted to convert the rotation output of the motor into translation output, the transmission ratio is large, the transmission efficiency is high, and the structure is compact; the installation is convenient, and the space in the vehicle is saved; the utility model discloses an integrated form electron hydraulic braking system can realize the accurate control of pressure, and the response is rapid, can establish sufficient brake pressure in the short time. The intelligent control system has the functions of active braking, failure backup, braking energy recovery and the like, and can effectively integrate active control technologies such as an Electronic Stability Program (ESP), Adaptive Cruise Control (ACC) and the like, so as to realize intelligent control of the vehicle.
Drawings
Fig. 1 is a front view of the overall structure of the braking system of the present invention.
Fig. 2 is a rear view of the overall structure of the braking system of the present invention.
Fig. 3 is an exploded view of the internal structure of the braking system of the present invention.
The labels in the above figures are as follows:
1. liquid storage tank 2, brake master cylinder 3, electric pressure building cylinder 4 and pedal feel simulator
5. Hydraulic control unit 6, electric control unit 10, first piston 11, second piston
12. A first working chamber 13, a second working chamber 14, a first return spring 15 and a second return spring
16. Pedal push rod 17, brake pedal 18, stroke sensor 19 and first liquid conveying pipeline
20. A second infusion pipeline 21, a first electromagnetic valve 22, a throttle valve 23 and a first one-way valve
24. A second solenoid valve 25, a third liquid delivery pipeline 26, a hydraulic pressure sensor 27, and a third solenoid valve
30. Third piston 31, simulator front chamber 32, simulator rear chamber 33, third return spring
34. A first liquid return pipeline 35, a fourth electromagnetic valve 40, a motor 41 and a fourth piston
42. Corner sensor 43, third working chamber 44, fourth transfusion pipeline 45 and fifth electromagnetic valve
46. A sixth electromagnetic valve 50, a fifth transfusion pipeline 51, a first liquid inlet valve 52 and a first liquid outlet valve
53. First brake wheel cylinder 54, second liquid inlet valve 55, second liquid outlet valve 56 and second brake wheel cylinder
57. A sixth liquid conveying pipeline 58, a third liquid inlet valve 59, a third liquid outlet valve 60 and a third brake wheel cylinder
61. A fourth liquid inlet valve 62, a fourth liquid outlet valve 63, a fourth brake wheel cylinder 64 and a second liquid return pipeline
65. A second one-way valve.
Detailed Description
Please refer to fig. 1 to 3:
the utility model provides an integrated form electronic hydraulic braking system is including liquid storage pot 1, brake master cylinder 2, electronic pressure jar 3 of building, footboard sensation simulator 4, hydraulic control unit 5 and electrical unit 6, wherein liquid storage pot 1, brake master cylinder 2, electronic pressure jar 3 of building, footboard sensation simulator 4, hydraulic control unit 5 and electrical unit 6 integration are an overall structure, liquid storage pot 1 is close to brake master cylinder 2 installation and is linked together with brake master cylinder 2, brake master cylinder 2 assembles in hydraulic control unit 5, electrical unit 6 establishes the upper portion at hydraulic control unit 5, electronic pressure jar 3 of building passes electrical unit 6 and also assembles the upper portion at hydraulic control unit 5, footboard sensation simulator 4 sets up the one side at hydraulic control unit 5, liquid storage pot 1 assembles the opposite side at hydraulic control unit 5.
A first piston 10 and a second piston 11 are arranged in a brake master cylinder 2, a first working chamber 12 is formed between the first piston 10 and the second piston 11, a second working chamber 13 is formed at the bottom of the inner chamber of the brake master cylinder 2 and the second piston 11, a first return spring 14 is arranged in the first working chamber 12, a second return spring 15 is arranged in the second working chamber 13, the first working chamber 12 and the second working chamber 13 are both communicated with a liquid storage tank 1, the first working chamber 12 and the second working chamber 13 are filled with hydraulic oil, the outer end of the first piston 10 is connected with a pedal push rod 16, the outer end of the pedal push rod 16 is hinged with a brake pedal 17, the pedal push rod 16 is provided with a stroke sensor 18, the stroke sensor 18 is connected with an electronic control unit 6, the stroke sensor 18 can transmit displacement data of the pedal push rod 16 to the electronic control unit 6 in real time, the first working chamber 12 is connected with a first transfusion pipeline 19 and a second transfusion pipeline 20, the first working chamber 12 is communicated with an inner cavity of the pedal sensation simulator 4 through a first infusion pipeline 19, the first infusion pipeline 19 is connected with a first electromagnetic valve 21, the first infusion pipeline 19 is further connected with two branches, one branch is provided with a throttle valve 22, the other branch is provided with a first one-way valve 23, the second infusion pipeline 20 is connected with a second electromagnetic valve 24, the second working chamber 13 is connected with a third infusion pipeline 25, the third infusion pipeline 25 is sequentially connected with a hydraulic sensor 26 and a third electromagnetic valve 27, the hydraulic sensor 26 is connected with the electronic control unit 6, the hydraulic sensor 26 can transmit collected data to the electronic control unit 6 in real time, and the first electromagnetic valve 21, the throttle valve 22, the first one-way valve 23, the second electromagnetic valve 24 and the third electromagnetic valve 27 are all connected with the electronic control unit 6 and work is controlled by the electronic control unit 6.
The first solenoid valve 21 is a linear valve, and the second solenoid valve 24 and the third solenoid valve 27 are two-position three-way solenoid valves, wherein the front end opening of the second solenoid valve 24 is communicated with the outlet of the second infusion pipeline 20, and the front end opening of the third solenoid valve 27 is communicated with the outlet of the third infusion pipeline 25.
A third piston 30 is arranged in an inner cavity of the pedal feel simulator 4, wherein a simulator front cavity 31 is arranged on the left side of the third piston 30, a simulator rear cavity 32 is arranged on the right side of the third piston 30, the simulator front cavity 31 and the simulator rear cavity 32 are filled with hydraulic oil, the simulator front cavity 31 is communicated with the first working cavity 12 in the master cylinder 2 through a first liquid conveying pipeline 19, a third return spring 33 is assembled in the simulator rear cavity 32, the simulator rear cavity 32 is further connected with a first liquid return pipeline 34, a liquid outlet of the first liquid return pipeline 34 is communicated with the first working cavity 12 in the master cylinder 2, a fourth electromagnetic valve 35 is connected to the first liquid return pipeline 34, the fourth electromagnetic valve 35 is a switch valve, and the fourth electromagnetic valve 35 is connected with the electronic control unit 6 and is controlled to work by the electronic control unit 6.
One end of the electric pressure building cylinder 3 is provided with a motor 40, a fourth piston 41 is arranged in an inner cavity of the electric pressure building cylinder 3, an output shaft of the motor 40 is a lead screw, the lead screw is inserted in the fourth piston 41 and forms a ball screw structure with the fourth piston 41, the rotation of the motor 40 can drive the fourth piston 41 to move in the inner cavity of the electric pressure building cylinder 3, a rotor of the motor 40 is provided with a rotation angle sensor 42, the rotation angle sensor 42 is connected with the electric control unit 6, the rotation angle sensor 42 can transmit collected data to the electric control unit 6 in real time, the motor 40 is connected with the electric control unit 6 and is controlled by the electric control unit 6 to work, a third working cavity 43 is formed at the free end of the fourth piston 41 and the bottom of the electric pressure building cylinder 3, the third working cavity 43 is filled with hydraulic oil, the third working cavity 43 is connected with a fourth infusion pipeline 44, and the fourth infusion pipeline 44 is, a fifth electromagnetic valve 45 is arranged on one branch, a sixth electromagnetic valve 46 is arranged on the other branch, wherein the fifth electromagnetic valve 45 is a switch valve, the sixth electromagnetic valve 46 is a linear valve, in a power-off state, the sixth electromagnetic valve 46 is in a normally open position, the fifth electromagnetic valve 45 is in a normally closed position, the fifth electromagnetic valve 45 and the sixth electromagnetic valve 46 are both connected with the electric control unit 6 and controlled by the electric control unit 6 to work, a liquid outlet of the fourth infusion pipeline 44 is divided into two outlets, the first outlet is connected with a front end closed port of the second electromagnetic valve 24, and the second outlet is connected with a front end closed port of the third electromagnetic valve 27.
A liquid outlet of the second electromagnetic valve 24 is connected with a fifth liquid conveying pipeline 50, the fifth liquid conveying pipeline 50 is connected with two branch pipes, one branch pipe is sequentially provided with a first liquid inlet valve 51 and a first liquid outlet valve 52, a pipeline between the first liquid inlet valve 51 and the first liquid outlet valve 52 is connected with a first brake wheel cylinder 53, the other branch pipe is sequentially provided with a second liquid inlet valve 54 and a second liquid outlet valve 55, a pipeline between the second liquid inlet valve 54 and the second liquid outlet valve 55 is connected with a second brake wheel cylinder 56, a liquid outlet of the third electromagnetic valve 27 is connected with a sixth liquid conveying pipeline 57, the sixth liquid conveying pipeline 57 is connected with two branch pipes, one branch pipe is sequentially provided with a third liquid inlet valve 58 and a third liquid outlet valve 59, a pipeline between the third liquid inlet valve 58 and the third liquid outlet valve 59 is connected with a third brake wheel cylinder 60, the other branch pipe is sequentially provided with a fourth liquid inlet valve 61 and a fourth liquid outlet valve 62, a fourth brake wheel cylinder 63 is connected to a pipeline between the fourth liquid inlet valve 61 and the fourth liquid outlet valve 62, the fifth liquid conveying pipeline 50 and the sixth liquid conveying pipeline 57 are connected to a second liquid return pipeline 64 after being merged, a liquid outlet of the second liquid return pipeline 64 is communicated with the third working cavity 43 in the electric pressure building cylinder 3, a second one-way valve 65 is arranged on the second liquid return pipeline 64, and the first liquid inlet valve 51, the first liquid outlet valve 52, the second liquid inlet valve 54, the second liquid outlet valve 55, the third liquid inlet valve 58, the third liquid outlet valve 59, the fourth liquid inlet valve 61, the fourth liquid outlet valve 62 and the second one-way valve 65 are all connected to the electric control unit 6 and controlled by the electric control unit 6 to operate.
The electronic control unit 6 is an ECU.
The hydraulic control unit 5 is composed of a first electromagnetic valve 21, a throttle valve 22, a first one-way valve 23, a second electromagnetic valve 24, a third electromagnetic valve 27, a fourth electromagnetic valve 35, a fifth electromagnetic valve 45, a sixth electromagnetic valve 46, a first liquid inlet valve 51, a first liquid outlet valve 52, a second liquid inlet valve 54, a second liquid outlet valve 55, a third liquid inlet valve 58, a third liquid outlet valve 59, a fourth liquid inlet valve 61, a fourth liquid outlet valve 62 and a second one-way valve 65, the first electromagnetic valve 21, the throttle valve 22, the first check valve 23, the second electromagnetic valve 24, the third electromagnetic valve 27, the fourth electromagnetic valve 35, the fifth electromagnetic valve 45, the sixth electromagnetic valve 46, the first liquid inlet valve 51, the first liquid outlet valve 52, the second liquid inlet valve 54, the second liquid outlet valve 55, the third liquid inlet valve 58, the third liquid outlet valve 59, the fourth liquid inlet valve 61, the fourth liquid outlet valve 62 and the second check valve 65 are all integrated in the hydraulic control unit 5. The first infusion pipeline 19, the second infusion pipeline 20, the third infusion pipeline 25, the fourth infusion pipeline 44, the fifth infusion pipeline 50, the sixth infusion pipeline 57, the first liquid return pipeline 34 and the second liquid return pipeline 64 are all integrated in the hydraulic control unit 5. The master cylinder 2 is also integrated in the hydraulic control unit 5.
The electronic control unit 6, the stroke sensor 18, the hydraulic sensor 26, the motor 40, the first electromagnetic valve 21, the throttle valve 22, the first check valve 23, the second electromagnetic valve 24, the third electromagnetic valve 27, the fourth electromagnetic valve 35, the fifth electromagnetic valve 45, the sixth electromagnetic valve 46, the first liquid inlet valve 51, the first liquid outlet valve 52, the second liquid inlet valve 54, the second liquid outlet valve 55, the third liquid inlet valve 58, the third liquid outlet valve 59, the fourth liquid inlet valve 61, the fourth liquid outlet valve 62, and the second check valve 65 are all assembled in the existing equipment, and therefore specific models and specifications are not described in detail.
The utility model discloses a theory of operation:
the utility model provides a complete decoupling zero's of integrated form electron hydraulic braking system, including conventional braking, initiative braking and three kinds of mode of backup failure, the particular case is as follows:
first case, normal braking mode:
when the system is in a normal braking mode, a driver steps on a brake pedal 17, pushes a first piston 10 through a pedal push rod 16, hydraulic oil in a first working chamber 12 is pressed into a simulator front cavity 31 of a pedal feel simulator 4 through a first liquid conveying pipeline 19 and a first electromagnetic valve 21, pushes a third piston 30 to overcome the resistance of a third return spring 33, the third return spring 33 simulates pedal feel, and the hydraulic oil flows out through a pore passage on the outer wall of the pedal feel simulator 4 and then flows back to the first working chamber 12 in the inner cavity of the brake master cylinder 2 through a first liquid return pipeline 34 and a fourth electromagnetic valve 35. This process simulates pedal feel primarily through the first and third return springs 14, 33.
Meanwhile, a stroke sensor 18 arranged on the pedal push rod 16 detects a pedal displacement signal and transmits the pedal displacement signal to the electronic control unit 6 in real time, the electronic control unit 6 controls the rotor of the motor 40 to operate according to a control algorithm, the rotation of the output shaft of the motor 40 is converted into the translation of the fourth piston 41 through a ball screw structure, the fourth piston 41 extrudes hydraulic oil in the third working chamber 43 to build pressure for the fourth brake wheel cylinder 63 and the third brake wheel cylinder 60 through the fourth fluid-delivery pipeline 44, the sixth electromagnetic valve 46, the third electromagnetic valve 27, the sixth fluid-delivery pipeline 57, the fourth fluid-intake valve 61 and the third fluid-intake valve 58; the other route builds pressure for a second brake wheel cylinder 56 and a first brake wheel cylinder 53 through a fourth infusion pipeline 44, a fifth electromagnetic valve 45, a second electromagnetic valve 24, a fifth infusion pipeline 50, a second liquid inlet valve 54 and a first liquid inlet valve 51.
When the driver releases the brake pedal 17, the first piston 10 is returned by the first return spring 14, the third piston 30 is returned by the third return spring 33, and the fourth piston 41 is reversely returned by the motor 40.
In a conventional braking mode, the braking system is in a complete decoupling state, at the moment, the force of the brake pedal 17 applied by a driver is completely decoupled from the power assisting of the motor 40, the driver only provides information such as required pedal travel and the like and does not participate in the actual braking process, the actual braking force is completely provided by the regenerative braking and electric pressure building cylinder 3, the regenerative braking force of a vehicle can be fully exerted, and the braking energy is recovered to the maximum extent.
Second case, active braking mode:
when the driver does not step on the brake pedal 17, if the vehicle-mounted environment sensing sensor (such as a speed measuring sensor, a distance measuring sensor, a camera, a radar and the like) measures that the distance between the vehicle and the front obstacle is too short, the electronic control unit 6 receives the information and judges that braking measures must be taken to prevent collision or other dangerous working conditions, and the electronic hydraulic system enters an active braking mode.
In the active braking mode, the electronic control unit 6 analyzes signals transmitted by other vehicle-mounted sensors, determines the active braking force required by the vehicle, and controls the motor 40 to operate through the control circuit. An output shaft of the motor 40 drives the ball screw mechanism to rotate, the rotation of the motor 40 is converted into the translation of the fourth piston 41 through the ball screw mechanism, and the fourth piston 41 extrudes hydraulic oil in the third working chamber 43 to build pressure for the fourth brake wheel cylinder 63 and the third brake wheel cylinder 60 through the fourth infusion pipeline 44, the sixth electromagnetic valve 46, the third electromagnetic valve 27, the sixth infusion pipeline 57, the fourth liquid inlet valve 61 and the third liquid inlet valve 58; the other route builds pressure for a second brake wheel cylinder 56 and a first brake wheel cylinder 53 through a fourth infusion pipeline 44, a fifth electromagnetic valve 45, a second electromagnetic valve 24, a fifth infusion pipeline 50, a second liquid inlet valve 54 and a first liquid inlet valve 51, and the drive-by-wire active braking is realized.
Third case, failure backup mode:
according to relevant regulations, when a brake system fails or some brake components are in failure, the brake system still needs to ensure that a certain brake strength can be generated so as to ensure safety and reliability.
The utility model provides an electronic hydraulic braking system of complete decoupling zero of integrated form when motor 40 or certain driving medium break down, all solenoid valves are in the outage state, as shown in the figure, and first solenoid valve 21 is in normally closed state. A driver steps on a brake pedal 17 to build pressure for the first working chamber 12 and the second working chamber 13, and hydraulic oil in the first working chamber 12 builds pressure for a second brake wheel cylinder 56 and a first brake wheel cylinder 53 through a second infusion pipeline 20, a second electromagnetic valve 24, a fifth infusion pipeline 50, a second liquid inlet valve 54 and a first liquid inlet valve 51; and the hydraulic oil in the second working cavity 13 builds pressure for the fourth brake wheel cylinder 63 and the third brake wheel cylinder 60 through the third infusion pipeline 25, the third electromagnetic valve 27, the sixth infusion pipeline 57, the fourth liquid inlet valve 61 and the third liquid inlet valve 58 so as to realize the failure backup function.
Claims (8)
1. An integrated electro-hydraulic brake system, characterized by: the hydraulic control system comprises a liquid storage tank, a master cylinder, an electric pressure building cylinder, a pedal feel simulator, a hydraulic control unit and an electric control unit, wherein the liquid storage tank, the master cylinder, the electric pressure building cylinder, the pedal feel simulator, the hydraulic control unit and the electric control unit are integrated into a whole structure, the liquid storage tank is installed close to the master cylinder and communicated with the master cylinder, the master cylinder is assembled in the hydraulic control unit, the electric control unit is arranged at the upper part of the hydraulic control unit, the electric pressure building cylinder penetrates through the electric control unit and is also assembled at the upper part of the hydraulic control unit, the pedal feel simulator is arranged at one side of the hydraulic control unit, and the liquid storage tank is assembled at.
2. An integrated electro-hydraulic brake system according to claim 1, wherein: the brake master cylinder is internally provided with a first piston and a second piston, a first working cavity is formed between the first piston and the second piston, a second working cavity is formed at the bottom of the inner cavity of the brake master cylinder and the second piston, a first return spring is arranged in the first working cavity, a second return spring is arranged in the second working cavity, the first working cavity and the second working cavity are both communicated with a liquid storage tank, hydraulic oil is filled in the first working cavity and the second working cavity, the outer end of the first piston is connected with a pedal push rod, the outer end of the pedal push rod is hinged with a brake pedal, a stroke sensor is arranged on the pedal push rod and is connected with an electric control unit, the stroke sensor can transmit displacement data of the pedal push rod to the electric control unit in real time, the first working cavity is connected with a first infusion pipeline and a second infusion pipeline, and is communicated with the inner cavity of the pedal feel simulator through the first infusion pipeline, the first infusion pipeline is connected with a first electromagnetic valve, the first infusion pipeline is further connected with two branches, a throttle valve is arranged on one branch, a first check valve is arranged on the other branch, a second electromagnetic valve is connected on the second infusion pipeline, the second working cavity is connected with a third infusion pipeline, a hydraulic sensor and a third electromagnetic valve are sequentially connected on the third infusion pipeline, the hydraulic sensor is connected with an electric control unit, the hydraulic sensor can transmit collected data to the electric control unit in real time, and the first electromagnetic valve, the throttle valve, the first check valve, the second electromagnetic valve and the third electromagnetic valve are all connected with the electric control unit and controlled to work by the electric control unit.
3. An integrated electro-hydraulic brake system as claimed in claim 2, wherein: the first electromagnetic valve is a linear valve, the second electromagnetic valve and the third electromagnetic valve are two-position three-way electromagnetic valves, wherein the front end opening of the second electromagnetic valve is communicated with the outlet of the second infusion pipeline, and the front end opening of the third electromagnetic valve is communicated with the outlet of the third infusion pipeline.
4. An integrated electro-hydraulic brake system according to claim 1 or 2, wherein: the pedal feeling simulator comprises a pedal feeling simulator and is characterized in that a third piston is arranged in an inner cavity of the pedal feeling simulator, a simulator front cavity is arranged on the left side of the third piston, a simulator rear cavity is arranged on the right side of the third piston, hydraulic oil is filled in the simulator front cavity and the simulator rear cavity, the simulator front cavity is communicated with a first working cavity in a brake main cylinder through a first liquid conveying pipeline, a third return spring is assembled in the simulator rear cavity, the simulator rear cavity is further connected with a first liquid return pipeline, a liquid outlet of the first liquid return pipeline is communicated with the first working cavity in the brake main cylinder, a fourth electromagnetic valve is connected to the first liquid return pipeline and is a switch valve, and the fourth electromagnetic valve is connected with an electric control unit and works under the control of the electric control unit.
5. An integrated electro-hydraulic brake system according to claim 1, wherein: one end of the electric pressure building cylinder is provided with a motor, a fourth piston is arranged in an inner cavity of the electric pressure building cylinder, an output shaft of the motor is a lead screw, the lead screw is inserted in the fourth piston and forms a ball screw structure with the fourth piston, the fourth piston can be driven to move in the inner cavity of the electric pressure building cylinder by the rotation of the motor, a rotor of the motor is provided with a corner sensor, the corner sensor is connected with an electric control unit, the collected data can be transmitted to the electric control unit in real time by the corner sensor, the motor is connected with the electric control unit and is controlled by the electric control unit to work, a third working cavity is formed at the free end of the fourth piston and the bottom of the electric pressure building cylinder, the third working cavity is filled with hydraulic oil, the third working cavity is connected with a fourth infusion pipeline, two branch pipelines are connected on the fourth infusion pipeline, a fifth electromagnetic valve is arranged on one branch, the fifth electromagnetic valve is a switch valve, the sixth electromagnetic valve is a linear valve, the sixth electromagnetic valve is in a normally open position in a power-off state, the fifth electromagnetic valve is in a normally closed position, the fifth electromagnetic valve and the sixth electromagnetic valve are both connected with the electric control unit and controlled by the electric control unit to work, a liquid outlet of the fourth infusion pipeline is divided into two outlets, the first outlet is connected with a front end closed port of the second electromagnetic valve, and the second outlet is connected with a front end closed port of the third electromagnetic valve.
6. An integrated electro-hydraulic brake system according to claim 2 or 3, wherein: the liquid outlet of the second electromagnetic valve is connected with a fifth liquid conveying pipeline, the fifth liquid conveying pipeline is connected with two branch pipes, one branch pipe is sequentially provided with a first liquid inlet valve and a first liquid outlet valve, a pipeline between the first liquid inlet valve and the first liquid outlet valve is connected with a first brake wheel cylinder, the other branch pipe is sequentially provided with a second liquid inlet valve and a second liquid outlet valve, a pipeline between the second liquid inlet valve and the second liquid outlet valve is connected with a second brake wheel cylinder, the liquid outlet of the third electromagnetic valve is connected with a sixth liquid conveying pipeline, the sixth liquid conveying pipeline is connected with two branch pipes, one branch pipe is sequentially provided with a third liquid inlet valve and a third liquid outlet valve, a pipeline between the third liquid inlet valve and the third liquid outlet valve is connected with a third brake wheel cylinder, the other branch pipe is sequentially provided with a fourth liquid inlet valve and a fourth liquid outlet valve, and a pipeline between the fourth liquid inlet valve and the fourth liquid outlet valve is connected with a fourth brake wheel cylinder, the fifth transfusion pipeline and the sixth transfusion pipeline are connected with a second liquid return pipeline after being converged, a liquid outlet of the second liquid return pipeline is communicated with a third working cavity in the electric pressure building cylinder, a second one-way valve is arranged on the second liquid return pipeline, and the first liquid inlet valve, the first liquid outlet valve, the second liquid inlet valve, the second liquid outlet valve, the third liquid inlet valve, the third liquid outlet valve, the fourth liquid inlet valve, the fourth liquid outlet valve and the second one-way valve are all connected with the electric control unit and controlled by the electric control unit to work.
7. An integrated electro-hydraulic brake system according to claim 1, wherein: the electric control unit is an ECU.
8. An integrated electro-hydraulic brake system according to claim 6, wherein: the hydraulic control unit consists of a first electromagnetic valve, a throttle valve, a first check valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve, a first liquid inlet valve, a first liquid outlet valve, a second liquid inlet valve, a second liquid outlet valve, a third liquid inlet valve, a third liquid outlet valve, a fourth liquid inlet valve, a fourth liquid outlet valve and a second check valve, wherein the first electromagnetic valve, the throttle valve, the first check valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the first liquid inlet valve, the first liquid outlet valve, the second liquid inlet valve, the second liquid outlet valve, the third liquid inlet valve, the third liquid outlet valve, the fourth liquid outlet valve and the second check valve are all integrated in the hydraulic control unit, and the first transfusion pipeline, the second transfusion pipeline, the third transfusion pipeline, the fourth transfusion pipeline, the fifth transfusion pipeline, the fourth solenoid valve, the fifth solenoid valve, the, The sixth infusion pipeline, the first liquid return pipeline and the second liquid return pipeline are integrated in the hydraulic control unit, and the brake master cylinder is also integrated in the hydraulic control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020632822.2U CN211918640U (en) | 2020-04-24 | 2020-04-24 | Integrated electronic hydraulic brake system |
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| CN202020632822.2U CN211918640U (en) | 2020-04-24 | 2020-04-24 | Integrated electronic hydraulic brake system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112356817A (en) * | 2020-11-25 | 2021-02-12 | 吉林大学 | Unmanned automobile braking system with backup mode and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112356817A (en) * | 2020-11-25 | 2021-02-12 | 吉林大学 | Unmanned automobile braking system with backup mode and control method thereof |
| CN112356817B (en) * | 2020-11-25 | 2021-07-23 | 吉林大学 | Unmanned automobile braking system with backup mode and control method thereof |
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