CN111873966A - Electro-hydraulic composite brake optimization control system and method - Google Patents

Abstract

The invention discloses an electro-hydraulic compound braking optimization control system and method. The optimization control system includes a sensor group, a sensor signal acquisition unit, an ABS control unit, a CPU processor, an anti-lock braking system, a motor braking unit, a hydraulic brake The sensor group is connected to the ABS control unit through the sensor signal acquisition unit, the ABS control unit is connected to the CPU processor, and the CPU processor is respectively connected to the anti-lock braking system, the motor braking unit, the hydraulic braking unit and the energy recovery system. The invention has a simple working principle, can ensure braking safety and energy-saving control through multi-objective optimization of the electro-hydraulic compound braking system, and is convenient for popularization and use.

Description

An electro-hydraulic composite braking optimization control system and method

technical field

The invention relates to the technical field of electro-hydraulic composite control, in particular to an electro-hydraulic composite braking optimization control system and method.

Background technique

Compared with the traditional hydraulic braking system, the electro-hydraulic composite braking system has the advantages of good braking stability and a certain energy recovery rate. When braking, the ECU can increase the proportion of the motor regenerative braking force to increase the energy recovery rate. On the contrary, during high-intensity braking, the braking force can be completely provided by the hydraulic braking force to ensure the braking efficiency.

The current electro-hydraulic composite braking system can only realize braking operation, and cannot effectively improve braking safety and energy-saving effect. Therefore, it is necessary to improve it.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an electro-hydraulic composite braking optimization control system and method to solve the problems raised in the above background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: an electro-hydraulic composite braking optimal control system, the optimal control system includes a sensor group, a sensor signal acquisition unit, an ABS control unit, a CPU processor, an anti-lock braking system, and a motor. Braking unit, hydraulic braking unit and energy recovery system, the sensor group is connected to the ABS control unit through the sensing signal acquisition unit, the ABS control unit is connected to the CPU processor, and the CPU processor is respectively connected to the anti-lock braking system, A motor braking unit, a hydraulic braking unit and an energy recovery system, the motor braking unit is connected to a wheel hub motor, and the hydraulic drive unit is connected to a hydraulic cylinder.

Preferably, the sensor group includes a brake pedal displacement sensor, a vehicle speed sensor, a steering wheel angle sensor and a torque sensor, the brake pedal displacement sensor is installed on the brake pedal for collecting the braking distance of the brake pedal, the vehicle speed The sensor is installed on the wheel axle to collect the speed of the vehicle; the steering wheel angle sensor is installed on the steering wheel of the car to collect the steering angle of the steering wheel, and the torque sensor is used to collect the wheel axle torque.

Preferably, the anti-lock braking system includes a circuit switching valve, and the output end of the circuit switching valve is used to connect with an electric anti-lock braking device or a pneumatic anti-lock braking device according to the actual operating condition of the vehicle; the pneumatic anti-lock braking device It is used to reduce the input brake air pressure to a preset air pressure to prevent the wheels of the automobile from locking; the electric anti-lock brake device is used to perform anti-lock brake processing on the brake air pressure according to the received brake control signal, so as to prevent the vehicle from locking. Prevent the car wheels from locking up.

Preferably, the energy recovery system includes an energy recovery unit and an energy storage unit, the energy recovery unit includes an energy conversion unit and an inverter unit, the energy conversion unit is used for converting mechanical energy during braking into electrical energy, and when driving Converting electrical energy into mechanical energy for driving a vehicle; the inverter unit is connected to the energy conversion unit for converting between alternating current and direct current; the energy storage unit includes an SOC acquisition unit, a battery management system, and an energy storage battery and a DC/DC conversion module, the energy storage battery is respectively connected to the battery management system and the SOC acquisition unit, the input end of the DC/DC conversion module is connected to the inverter unit, and the output end is connected to the battery management system.

Preferably, the optimal control method includes the following steps:

A. During the driving process of the car, the vehicle speed sensor collects the vehicle speed in real time. Once an emergency occurs and needs to be braked, the driver depresses the brake pedal and controls the steering wheel at the same time. The brake pedal displacement sensor collects the displacement distance of the brake pedal. Turn, the steering wheel angle sensor collects the steering wheel angle signal, and the torque sensor collects the axle torque signal;

B. The sensor signal is collected by the sensor signal acquisition unit and sent to the ABS control unit, and then transmitted to the CPU processor for processing;

C. The CPU processor processes and judges the braking mode according to the received signal. If the vehicle speed is greater than the preset value, the motor and hydraulic pressure are used for double braking, and at the same time, a control command is sent to the anti-lock braking system to perform anti-lock braking operation to prevent If the braking force is too large, the wheel locks up;

D. During the braking process, the energy recovery unit converts the mechanical energy during braking into electrical energy, and sends it to the energy storage unit for energy storage;

E. If the braking speed is less than the preset value, the motor or hydraulic pressure will be controlled to perform single braking, the anti-lock braking system will not be activated, and the energy recovery unit will continue to collect braking energy and convert it into electrical energy for energy storage.

Compared with the prior art, the beneficial effects of the present invention are as follows: the working principle of the present invention is simple, and the multi-objective optimization of the electro-hydraulic compound braking system can ensure braking safety and energy-saving control, and is convenient for popularization and application; The anti-lock braking performance of the dead system is superior, which improves the safety of the vehicle; the energy recovery system can recover the braking energy of the motor and the hydraulic braking energy, and convert the braking mechanical energy into electrical energy for recovery. At the same time, the battery management system can realize real-time Monitor the status of the energy storage battery to ensure that the battery is in the best working condition and prolong the service life of the car battery.

Description of drawings

Fig. 1 is the system principle block diagram of the present invention;

Fig. 2 is the principle block diagram of the anti-lock braking system of the present invention;

Fig. 3 is the principle block diagram of the energy recovery system of the present invention;

Figure 4 is a flow chart of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts 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 end", "rear end", "two ends", "one end" and "the other end" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, with a specific orientation. The orientation configuration and operation are therefore not to be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense, for example, "connected" may be a fixed connection It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

1-4, the present invention provides a technical solution: an electro-hydraulic composite braking optimization control system, the optimal control system includes a sensor group, a sensor signal acquisition unit 1, an ABS control unit 2, a CPU processor 3, Anti-lock braking system 4, motor braking unit 5, hydraulic braking unit 6 and energy recovery system 7, the sensor group is connected to the ABS control unit 2 through the sensing signal acquisition unit 1, and the ABS control unit 2 is connected to the CPU processor 3. The CPU processor 3 is respectively connected to the anti-lock braking 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 to the wheel hub motor 8, and the hydraulic drive unit 6. Connect the hydraulic cylinder 9; wherein, the sensor group includes a brake pedal displacement sensor 10, a vehicle speed sensor 11, a steering wheel angle sensor 12 and a torque sensor 13, and the brake pedal displacement sensor is installed on the brake pedal for collecting the brake pedal. Braking distance, the vehicle speed sensor is installed on the wheel axle to collect the speed of the vehicle; the steering wheel angle sensor is installed on the car steering wheel to collect the steering angle of the steering wheel, and the torque sensor is used to collect the wheel axle torque.

In the present invention, the anti-lock braking system 4 includes a circuit switching valve 14, and the output end of the circuit switching valve 14 is used to connect with the electric anti-lock braking device 15 or the pneumatic anti-lock braking device 16 according to the actual operating condition of the automobile; the pneumatic The anti-lock device is used to reduce the input brake air pressure to a preset air pressure to prevent the wheels of the car from locking; the electric anti-lock device is used to anti-lock the brake air pressure according to the received brake control signal dead handling to prevent the car wheels from locking up.

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, and the energy conversion unit 19 is used for braking The mechanical energy of the inverter is converted into electrical energy, and the electrical energy is converted into mechanical energy for driving the vehicle during driving; the inverter unit 20 is connected to the energy conversion unit 19 for converting between alternating current and direct current; the energy storage unit 18 includes The SOC acquisition unit 21, the battery management system 22, the energy storage battery 23 and the DC/DC conversion module 24, the energy storage battery 23 is respectively connected to the battery management system 22 and the SOC acquisition unit 21, the input end of the DC/DC conversion module 24 It is connected to the inverter unit 20 , and the output end is connected to the battery management system 22 .

Working principle: the optimal control method of the present invention comprises the following steps:

A. During the driving process of the car, the vehicle speed sensor collects the vehicle speed in real time. Once an emergency occurs and needs to be braked, the driver depresses the brake pedal and controls the steering wheel at the same time. The brake pedal displacement sensor collects the displacement distance of the brake pedal. Turn, the steering wheel angle sensor collects the steering wheel angle signal, and the torque sensor collects the axle torque signal;

B. The sensor signal is collected by the sensor signal acquisition unit and sent to the ABS control unit, and then transmitted to the CPU processor for processing;

C. The CPU processor processes and judges the braking mode according to the received signal. If the vehicle speed is greater than the preset value, the motor and hydraulic pressure are used for double braking, and at the same time, a control command is sent to the anti-lock braking system to perform anti-lock braking operation to prevent If the braking force is too large, the wheel locks up;

D. During the braking process, the energy recovery unit converts the mechanical energy during braking into electrical energy, and sends it to the energy storage unit for energy storage;

E. If the braking speed is less than the preset value, the motor or hydraulic pressure will be controlled to perform single braking, the anti-lock braking system will not be activated, and the energy recovery unit will continue to collect braking energy and convert it into electrical energy for energy storage.

To sum up, the working principle of the present invention is simple, and the multi-objective optimization of the electro-hydraulic composite braking system can ensure braking safety and energy-saving control, and is convenient for popularization and application; Vehicle safety; the adopted energy recovery system can recover motor braking energy and hydraulic braking energy, and convert braking mechanical energy into electrical energy for recovery. At the same time, the battery management system can monitor the status of the energy storage battery in real time to ensure that the battery The best working condition, prolong the service life of the car battery.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (5)

1. An optimal control system for electro-hydraulic composite braking, characterized in that: the optimal control system comprises a sensor group, a sensor signal acquisition unit (1), an ABS control unit (2), a CPU processor (3), an anti-lock brake system (4), motor braking unit (5), hydraulic braking unit (6) and energy recovery system (7), the sensor group is connected to the ABS control unit (2) through the sensing signal acquisition unit (1), so The ABS control unit (2) is connected to the CPU processor (3), and the CPU processor (3) is respectively connected to the anti-lock braking system (4), the motor braking unit (5), the hydraulic braking unit (6) and the energy In the recovery system (7), the motor braking unit (5) is connected to a wheel hub motor (8), and the hydraulic drive unit (6) is connected to a hydraulic cylinder (9). 2. An electro-hydraulic composite braking 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 angle sensor (12) and a torque sensor (13), the brake pedal displacement sensor is installed on the brake pedal for collecting the braking distance of the brake pedal, the vehicle speed sensor is installed on the wheel axle for collecting the vehicle speed; the steering wheel angle sensor It is installed on the steering wheel of the car to collect the steering angle of the steering wheel, and the torque sensor is used to collect the torque of the wheel axle. 3. An electro-hydraulic compound braking optimization control system according to claim 1, characterized in that: the anti-lock braking system (4) comprises a circuit switching valve (14), and the circuit switching valve (14) outputs The terminal is used to connect with an electric anti-lock braking device (15) or a pneumatic anti-lock braking device (16) according to the actual operating conditions of the car; the pneumatic anti-lock braking device is used to reduce the input brake air pressure to a preset air pressure to Prevent automobile wheels from locking; the electric anti-lock device is used to perform anti-lock processing on the brake air pressure according to the received brake control signal, so as to prevent the automobile wheels from locking. 4. An electro-hydraulic composite braking 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 (18) The recovery unit (17) includes an energy conversion unit (19) and an inverter unit (20), the energy conversion unit (19) is used for converting mechanical energy during braking into electrical energy, and during driving, converting electrical energy into mechanical energy for driving the vehicle the inverter unit (20) is connected to the energy conversion unit (19) for converting between alternating current and direct current; the energy storage unit (18) includes 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 to the battery management system (22) and the SOC acquisition unit (21), the DC/DC conversion module (21) The input end of the module (24) is connected to the inverter unit (20), and the output end is connected to the battery management system (22). 5. The optimal control method for realizing a kind of electro-hydraulic compound braking optimal control system according to claim 1, characterized in that: the optimal control method comprises the following steps: A. During the driving process of the car, the vehicle speed sensor collects the vehicle speed in real time. Once an emergency occurs and needs to be braked, the driver depresses the brake pedal and controls the steering wheel at the same time. The brake pedal displacement sensor collects the displacement distance of the brake pedal. Turn, the steering wheel angle sensor collects the steering wheel angle signal, and the torque sensor collects the axle torque signal; B. The sensor signal is collected by the sensor signal acquisition unit and sent to the ABS control unit, and then transmitted to the CPU processor for processing; C. The CPU processor processes and judges the braking mode according to the received signal. If the vehicle speed is greater than the preset value, the motor and hydraulic pressure are used for double braking, and at the same time, a control command is sent to the anti-lock braking system to perform anti-lock braking operation to prevent If the braking force is too large, the wheel locks up; D. During the braking process, the energy recovery unit converts the mechanical energy during braking into electrical energy, and sends it to the energy storage unit for energy storage; E. If the braking speed is less than the preset value, the motor or hydraulic pressure will be controlled to perform single braking, the anti-lock braking system will not be activated, and the energy recovery unit will continue to collect braking energy and convert it into electrical energy for energy storage.

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