CN111873966A - Electro-hydraulic composite brake optimization control system and method - Google Patents
Electro-hydraulic composite brake optimization control system and method Download PDFInfo
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- CN111873966A CN111873966A CN202010780124.1A CN202010780124A CN111873966A CN 111873966 A CN111873966 A CN 111873966A CN 202010780124 A CN202010780124 A CN 202010780124A CN 111873966 A CN111873966 A CN 111873966A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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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
- B60T13/12—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 the fluid being liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
-
- 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
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses an electro-hydraulic composite brake optimization control system and method, wherein the optimization control system comprises a sensor group, a sensing signal acquisition unit, an ABS control unit, a CPU processor, an anti-lock system, a motor brake unit, a hydraulic brake unit and an energy recovery system, the sensor group is connected with the ABS control unit through the sensing signal acquisition unit, the ABS control unit is connected with the CPU processor, and the CPU processor is respectively connected with the anti-lock system, the motor brake unit, the hydraulic brake unit and the energy recovery system.
Description
Technical Field
The invention relates to the technical field of electro-hydraulic compound control, in particular to an electro-hydraulic compound brake optimization control system and method.
Background
Compared with a traditional hydraulic braking system, the electro-hydraulic composite braking system has the advantages of good braking stability, certain energy recovery rate and the like, and because the system can recover a part of braking energy in the braking process, the ECU can increase the proportion of the regenerative braking force of the motor and increase the energy recovery rate during light braking. On the contrary, in the case of high-intensity braking, the braking force can be completely provided by the hydraulic braking force, and the braking efficiency is ensured.
The existing electro-hydraulic composite brake system can only realize brake operation, and cannot effectively improve brake safety and energy-saving effect, so that improvement is needed.
Disclosure of Invention
The invention aims to provide an electro-hydraulic composite brake optimization control system and method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an electricity liquid composite braking optimal control system, optimal control system includes sensor group, sensing signal acquisition unit, ABS the control unit, CPU treater, anti-lock system, motor braking unit, hydraulic braking unit and energy recuperation system, sensor group passes through sensing signal acquisition unit and connects ABS the control unit, ABS the control unit connects the CPU treater, CPU treater connects anti-lock system, motor braking unit, hydraulic braking unit and energy recuperation system respectively, motor braking unit connects wheel hub motor, hydraulic drive unit connects the pneumatic cylinder.
Preferably, the sensor group comprises a brake pedal displacement sensor, a vehicle speed sensor, a steering wheel angle sensor and a torque sensor, the brake pedal displacement sensor is mounted on a brake pedal and used for acquiring the braking distance of the brake pedal, and the vehicle speed sensor is mounted on a wheel shaft and used for acquiring the vehicle running speed; the steering wheel corner sensor is mounted on an automobile steering wheel and used for collecting steering angles of the steering wheel, and the torque sensor is used for collecting wheel shaft torque.
Preferably, the anti-lock system comprises a circuit switching valve, and an output end of the circuit switching valve is used for being connected with an electric anti-lock device or a pneumatic anti-lock device according to the actual running condition of the automobile; the pneumatic anti-lock device is used for reducing the input brake air pressure to a preset air pressure so as to prevent the locking of the automobile wheels; and the electric anti-lock device is used for performing anti-lock processing on the brake air pressure according to the received brake control signal so as to prevent the automobile wheels from being locked.
Preferably, the energy recovery system comprises an energy recovery unit and an energy storage unit, the energy recovery unit comprises an energy conversion unit and an inversion unit, the energy conversion unit is used for converting mechanical energy during braking into electric energy and converting the electric energy into mechanical energy for driving a vehicle during driving; the inversion unit is connected with the energy conversion unit and is used for converting alternating current and direct current; the energy storage unit comprises an SOC acquisition unit, a battery management system, an energy storage battery and a DC/DC conversion module, wherein the energy storage battery is respectively connected with the battery management system and the SOC acquisition unit, the input end of the DC/DC conversion module is connected with the inversion unit, and the output end of the DC/DC conversion module is connected with the battery management system.
Preferably, the optimization control method comprises the following steps:
A. in the running process of an automobile, a vehicle speed sensor acquires the speed of the automobile in real time, once an emergency state occurs and braking is needed, a driver steps on a brake pedal and controls a steering wheel at the same time, a brake pedal displacement sensor acquires the displacement distance of the brake pedal, if the steering wheel rotates, a steering wheel corner sensor acquires a steering wheel corner signal, and a torque sensor acquires an axle torque signal;
B. the sensing signal is acquired by the sensing signal acquisition unit and then sent to the ABS control unit, and then is transmitted to the CPU for processing;
C. the CPU processor processes and judges a braking mode according to the received signals, and if the vehicle speed is greater than a preset value, the motor and the hydraulic double braking are carried out, and meanwhile, a control command is sent to an anti-lock system to carry out anti-lock operation, so that wheels with overlarge braking force are prevented from being locked;
D. in the braking process, the energy recovery unit converts mechanical energy during braking into electric energy and sends the electric energy to the energy storage unit for storing energy;
E. if the braking speed is smaller than the preset value, the motor or the hydraulic pressure is controlled to perform single braking, the anti-lock system is not started, and the energy recovery unit continues to collect braking energy and converts the braking energy into electric energy for storing energy.
Compared with the prior art, the invention has the beneficial effects that: the invention has simple working principle, can ensure braking safety and energy-saving control through multi-objective optimization of the electro-hydraulic composite braking system, and is convenient for popularization and use; the adopted anti-lock system has excellent anti-lock performance, and the safety of the vehicle is improved; the energy recovery system can recover motor braking energy and hydraulic braking energy, converts braking mechanical energy into electric energy to be recovered, and meanwhile, the battery management system can monitor the state of the energy storage battery in real time, so that the battery is ensured to be in the best working state, and the service life of the automobile battery is prolonged.
Drawings
FIG. 1 is a schematic block diagram of the system of the present invention;
FIG. 2 is a schematic block diagram of an anti-lock braking system according to the present invention;
FIG. 3 is a schematic block diagram of the energy recovery system of the present invention;
FIG. 4 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-4, the present invention provides a technical solution: an electro-hydraulic composite brake optimization control system comprises a sensor group, a sensing signal acquisition unit 1, an ABS control unit 2, a CPU (central processing unit) processor 3, an anti-lock system 4, a motor brake unit 5, a hydraulic brake unit 6 and an energy recovery system 7, wherein the sensor group is connected with the ABS control unit 2 through the sensing signal acquisition unit 1, the ABS control unit 2 is connected with the CPU processor 3, the CPU processor 3 is respectively connected with the anti-lock system 4, the motor brake unit 5, the hydraulic brake unit 6 and the energy recovery system 7, the motor brake unit 5 is connected with a hub motor 8, and the hydraulic drive unit 6 is connected with a hydraulic cylinder 9; the sensor group comprises a brake pedal displacement sensor 10, a vehicle speed sensor 11, a steering wheel corner sensor 12 and a torque sensor 13, wherein the brake pedal displacement sensor is mounted on a brake pedal and used for acquiring the braking distance of the brake pedal, and the vehicle speed sensor is mounted on a wheel shaft and used for acquiring the running speed of a vehicle; the steering wheel corner sensor is mounted on an automobile steering wheel and used for collecting steering angles of the steering wheel, and the torque sensor is used for collecting wheel shaft torque.
In the invention, the anti-lock system 4 comprises a loop switching valve 14, and the output end of the loop switching valve 14 is used for being connected with an electric anti-lock device 15 or a pneumatic anti-lock device 16 according to the actual running condition of the automobile; the pneumatic anti-lock device is used for reducing the input brake air pressure to a preset air pressure so as to prevent the locking of the automobile wheels; and the electric anti-lock device is used for performing anti-lock processing on the brake air pressure according to the received brake control signal so as to prevent the automobile wheels from being locked.
In addition, in the present invention, the energy recovery system 7 includes an energy recovery unit 17 and an energy storage unit 18, the energy recovery unit 17 includes an energy conversion unit 19 and an inverter unit 20, the energy conversion unit 19 is configured to convert mechanical energy during braking into electric energy, and convert electric energy during driving into mechanical energy for driving the vehicle; the inverter unit 20 is connected to the energy conversion unit 19, and is configured to convert alternating current and direct current; the energy storage unit 18 comprises an SOC acquisition unit 21, a battery management system 22, an energy storage battery 23 and a DC/DC conversion module 24, wherein the energy storage battery 23 is respectively connected with the battery management system 22 and the SOC acquisition unit 21, the input end of the DC/DC conversion module 24 is connected with the inverter unit 20, and the output end of the DC/DC conversion module is connected with the battery management system 22.
The working principle is as follows: the optimization control method comprises the following steps:
A. in the running process of an automobile, a vehicle speed sensor acquires the speed of the automobile in real time, once an emergency state occurs and braking is needed, a driver steps on a brake pedal and controls a steering wheel at the same time, a brake pedal displacement sensor acquires the displacement distance of the brake pedal, if the steering wheel rotates, a steering wheel corner sensor acquires a steering wheel corner signal, and a torque sensor acquires an axle torque signal;
B. the sensing signal is acquired by the sensing signal acquisition unit and then sent to the ABS control unit, and then is transmitted to the CPU for processing;
C. the CPU processor processes and judges a braking mode according to the received signals, and if the vehicle speed is greater than a preset value, the motor and the hydraulic double braking are carried out, and meanwhile, a control command is sent to an anti-lock system to carry out anti-lock operation, so that wheels with overlarge braking force are prevented from being locked;
D. in the braking process, the energy recovery unit converts mechanical energy during braking into electric energy and sends the electric energy to the energy storage unit for storing energy;
E. if the braking speed is smaller than the preset value, the motor or the hydraulic pressure is controlled to perform single braking, the anti-lock system is not started, and the energy recovery unit continues to collect braking energy and converts the braking energy into electric energy for storing energy.
In conclusion, the working principle of the invention is simple, braking safety and energy-saving control can be ensured through multi-objective optimization of the electro-hydraulic composite braking system, and the invention is convenient for popularization and use; the adopted anti-lock system has excellent anti-lock performance, and the safety of the vehicle is improved; the energy recovery system can recover motor braking energy and hydraulic braking energy, converts braking mechanical energy into electric energy to be recovered, and meanwhile, the battery management system can monitor the state of the energy storage battery in real time, so that the battery is ensured to be in the best working state, and the service life of the automobile battery is prolonged.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. An electro-hydraulic compound brake optimization control system is characterized in that: the optimization control system comprises a sensor group, a sensing signal acquisition unit (1), an ABS control unit (2), a CPU processor (3), an anti-lock system (4), a motor braking unit (5), a hydraulic braking unit (6) and an energy recovery system (7), wherein the sensor group is connected with the ABS control unit (2) through the sensing signal acquisition unit (1), the ABS control unit (2) is connected with the CPU processor (3), the CPU processor (3) is respectively connected with the anti-lock system (4), the motor braking unit (5), the hydraulic braking unit (6) and the energy recovery system (7), the motor braking unit (5) is connected with a hub motor (8), and the hydraulic driving unit (6) is connected with a hydraulic cylinder (9).
2. The electro-hydraulic compound brake optimization control system according to claim 1, characterized in that: the sensor group comprises a brake pedal displacement sensor (10), a vehicle speed sensor (11), a steering wheel corner sensor (12) and a torque sensor (13), wherein the brake pedal displacement sensor is mounted on a brake pedal and used for acquiring the braking distance of the brake pedal, and the vehicle speed sensor is mounted on a wheel shaft and used for acquiring the vehicle running speed; the steering wheel corner sensor is mounted on an automobile steering wheel and used for collecting steering angles of the steering wheel, and the torque sensor is used for collecting wheel shaft torque.
3. The electro-hydraulic compound brake optimization control system according to claim 1, characterized in that: the anti-lock system (4) comprises a loop switching valve (14), and the output end of the loop switching valve (14) is used for being connected with an electric anti-lock device (15) or a pneumatic anti-lock device (16) according to the actual running condition of the automobile; the pneumatic anti-lock device is used for reducing the input brake air pressure to a preset air pressure so as to prevent the locking of the automobile wheels; and the electric anti-lock device is used for performing anti-lock processing on the brake air pressure according to the received brake control signal so as to prevent the automobile wheels from being locked.
4. The electro-hydraulic compound brake optimization control system according to claim 1, characterized in that: the energy recovery system (7) comprises an energy recovery unit (17) and an energy storage unit (18), the energy recovery unit (17) comprises an energy conversion unit (19) and an inverter unit (20), the energy conversion unit (19) is used for converting mechanical energy during braking into electric energy, and the electric energy during driving is converted into mechanical energy for driving a vehicle; the inversion unit (20) is connected with the energy conversion unit (19) and is used for converting alternating current and direct current; the energy storage unit (18) comprises an SOC acquisition unit (21), a battery management system (22), an energy storage battery (23) and a DC/DC conversion module (24), the energy storage battery (23) is respectively connected with the battery management system (22) and the SOC acquisition unit (21), the input end of the DC/DC conversion module (24) is connected with the inversion unit (20), and the output end of the DC/DC conversion module is connected with the battery management system (22).
5. The optimal control method for realizing the electro-hydraulic compound brake optimal control system of claim 1 is characterized by comprising the following steps of: the optimization control method comprises the following steps:
A. in the running process of an automobile, a vehicle speed sensor acquires the speed of the automobile in real time, once an emergency state occurs and braking is needed, a driver steps on a brake pedal and controls a steering wheel at the same time, a brake pedal displacement sensor acquires the displacement distance of the brake pedal, if the steering wheel rotates, a steering wheel corner sensor acquires a steering wheel corner signal, and a torque sensor acquires an axle torque signal;
B. the sensing signal is acquired by the sensing signal acquisition unit and then sent to the ABS control unit, and then is transmitted to the CPU for processing;
C. the CPU processor processes and judges a braking mode according to the received signals, and if the vehicle speed is greater than a preset value, the motor and the hydraulic double braking are carried out, and meanwhile, a control command is sent to an anti-lock system to carry out anti-lock operation, so that wheels with overlarge braking force are prevented from being locked;
D. in the braking process, the energy recovery unit converts mechanical energy during braking into electric energy and sends the electric energy to the energy storage unit for storing energy;
E. if the braking speed is smaller than the preset value, the motor or the hydraulic pressure is controlled to perform single braking, the anti-lock system is not started, and the energy recovery unit continues to collect braking energy and converts the braking energy into electric energy for storing energy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010780124.1A CN111873966A (en) | 2020-08-05 | 2020-08-05 | Electro-hydraulic composite brake optimization control system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010780124.1A CN111873966A (en) | 2020-08-05 | 2020-08-05 | Electro-hydraulic composite brake optimization control system and method |
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Application publication date: 20201103 |