Auxiliary braking system and control method for electrically-driven pneumatic tyred roller

Abstract

The invention discloses an auxiliary braking system of an electrically-driven pneumatic tyred roller and a control method, the system is characterized in that an output shaft of a driving motor is connected to a first end of a brake disc through a transmission shaft, a second end of the brake disc is connected with an input end of a driving axle, and an output end of the driving axle is in driving connection with a driving wheel; the brake is connected with the air valve through a pipeline. The air valve has an inflation mode, a neutral position mode and a deflation mode. When the air valve is in an inflation mode, air of the air source is conveyed to the brake through the air valve, so that a brake caliper of the brake clamps a brake disc, and auxiliary braking force is output to the brake disc; when the air valve is in the neutral position mode, the current auxiliary braking force is kept; when the air valve is in a deflation mode, air in the brake is exhausted through the air valve, and the auxiliary braking force output to the brake disc by the brake caliper of the brake is reduced or disappears; the driving motor and the air valve are in signal connection with the controller, the working mode of the air valve is controlled through the controller, and therefore the auxiliary braking force is adjusted.

Description

Technical Field

[0001] The invention belongs to the technical field of tire rollers and relates to an auxiliary braking system and a control method for an electric-driven tire roller. Background Art

[0002] Tire rollers are mainly used for compacting asphalt concrete and other surface layers, and are also suitable for compacting cement stabilized soil, infrastructure foundations, and roadbeds. They are indispensable compaction machinery for building airports and highways. Asphalt surface construction requires the joint operation of multiple equipment such as pavers, asphalt transfer vehicles, double steel wheel rollers, and tire rollers, the environment around the rollers is relatively complex during the construction process, and there are many auxiliary construction personnel on the road surface, which poses certain safety risks.

[0003] Therefore, the reliability of the braking system, the braking distance of the entire machine, and the braking stability have a great impact on the safety of roller construction and the smoothness of the road surface. Summary of the invention

[0004] Purpose: In view of at least one of the above technical problems, the present invention provides an auxiliary braking system and control method for an electric-driven tire roller, which can serve as auxiliary braking in the event of motor brake failure and can also make vehicle braking smoother by controlling the braking force.

[0005] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is: In a first aspect, an auxiliary braking system for an electrically driven tire roller is provided, comprising a driving motor, a transmission shaft, a brake, a brake disc, a driving axle, a driving wheel, a controller and an air valve; The output shaft of the driving motor is connected to the first end of the brake disc through the transmission shaft, the second end of the brake disc is connected to the input end of the driving axle, and the output end of the driving axle is drivingly connected to the driving wheel; The brake is connected to the air valve through a pipeline, and the air valve has at least an inflation mode, a neutral mode and a deflation mode; when the air valve is in the inflation mode, the gas of the air source is transmitted to the brake through the air valve, so that the brake caliper of the brake clamps the brake disc and outputs an auxiliary braking force to the brake disc; when the air valve is in the neutral mode, the current auxiliary braking force is maintained; when the air valve is in the deflation mode, the gas in the brake is discharged through the air valve, and the auxiliary braking force output by the brake caliper of the brake to the brake disc is reduced or disappears; The driving motor and the air valve are respectively connected to the controller signal.

[0006] In a second aspect, a method for controlling auxiliary braking of an electric-driven tire roller is provided, the control method comprising: When the driving motor fails to brake and stops outputting braking torque, or the braking torque output by the driving motor is insufficient; The controller obtains the target speed of the drive motor and the actual speed of the drive motor, calculates the actual reverse acceleration according to the actual speed of the drive motor, calculates the target reverse acceleration according to the target speed of the drive motor and the actual speed of the drive motor, and determines the target reverse acceleration range according to the error; In response to the actual reverse acceleration being less than the lower limit of the target reverse acceleration, the controller sends a command to control the air valve to open to the inflation mode to inflate the brake. The brake caliper of the brake clamps the brake disc and outputs auxiliary braking force to the brake disc. The brake disc converts the braking force into braking torque and transmits it to the drive wheel through the drive axle, causing the roller to slow down and brake.

[0007] In some embodiments, the electric tire roller auxiliary braking control method further includes: during the auxiliary braking process, in response to the actual reverse acceleration being within the target reverse acceleration range, the controller issues an instruction to control the air valve to switch to a neutral mode, neither inflating nor deflating, thereby maintaining the current auxiliary braking force.

[0008] In some embodiments, the auxiliary braking control method of the electric tire roller also includes: during the auxiliary braking process, in response to the actual reverse acceleration being greater than the upper limit value of the target reverse acceleration, the controller issues an instruction to control the air valve to switch to the deflation mode, discharges the gas in the brake, reduces or eliminates the force of the brake caliper clamping the brake disc, reduces or eliminates the auxiliary braking force output to the brake disc, reduces or eliminates the braking torque transmitted to the drive wheel through the drive axle, and reduces or eliminates the braking force of the roller.

[0009] In a third aspect, an auxiliary braking system for an electric-driven tire roller is provided, wherein the controller comprises a memory and a processor, the memory being used to store instructions, the instructions being used to control the processor to operate so as to execute the auxiliary braking control method for the electric-driven tire roller described above.

[0010] In a fourth aspect, an electric-driven tire roller is provided, comprising the above-mentioned auxiliary braking system for the electric-driven tire roller.

[0011] Beneficial effects: The electric-driven tire roller auxiliary braking system and control method provided by the present invention can be used as auxiliary braking in the event of motor brake failure, and can also control the braking force to make the vehicle brake more stable and avoid damage to the road surface during compaction. By adding a brake at the output end of the drive motor, the whole machine controller adjusts the braking force in real time, thereby increasing the reliability of the braking system, ensuring construction safety, and making the braking force more stable and improving the compaction flatness of the road surface. It has the following advantages: 1. When the motor fails and the motor brake fails, the brake can replace the motor brake to ensure the braking of the entire machine and improve the safety of operation. At the same time, it avoids the use and damage of the parking brake and increases the service life of the drive axle and parking brake; 2. When the roller brakes downhill, when the speed drops to a certain value, the motor braking torque decreases, the controller outputs a command to open the air valve at an appropriate opening, and the brake outputs appropriate braking force to stop the roller, thereby improving the safety of the roller operating on a slope; 3. When the roller brakes at high speed or on a steep slope, if the controller detects that the braking torque of the drive motor is insufficient, the brake can be used as a supplement to provide additional braking force that can be adjusted in real time, so that the roller can obtain a constant and appropriate braking force, smooth the braking process, ensure that the road surface is not damaged, and improve the road surface smoothness. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the structure of a driving system according to an embodiment of the present invention; Figure 2 FIG. 1 is a schematic diagram of a driving system according to an embodiment of the present invention.

[0013] In the figure: 1. driving motor, 2. transmission shaft, 3. brake, 4. brake disc, 5. brake bracket, 6. driving axle, 7. driving wheel, 8. controller, 9. air valve. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0015] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0016] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0017] In the existing technical solution, the transmission system of the road roller is as follows: the drive motor is directly fixed to the drive axle housing, and the output shaft of the drive motor and the input shaft of the drive axle are connected by splines to transmit torque. The whole machine controller communicates with the drive motor (motor controller) to detect and control the speed of the drive motor in real time. When the whole machine needs to brake, the whole machine controller reads the information of the whole machine speed control handle, calculates the target speed of the whole machine, and converts it into the target speed of the motor; the whole machine controller communicates with the drive motor (motor controller), adjusts the speed of the drive motor, and achieves the purpose of braking the whole machine through motor braking.

[0018] There is a parking brake inside the drive axle. When the roller stops, the parking brake button can be used to control the parking brake to close and the entire machine to brake.

[0019] In an emergency, the parking brake can be used as an emergency brake. When the drive motor fails, the whole machine cannot be braked by the drive motor. At this time, press the parking brake button, the parking brake in the drive axle is closed, and the whole machine is braked urgently.

[0020] The above technical solution has the following deficiencies: 1. If the motor fails and the motor brake fails, the driver needs to react quickly and press the emergency brake button, which delays time and increases the braking distance of the entire machine. In addition, the parking brake is generally only used for braking when the vehicle speed is zero, and is not suitable for dynamic friction braking. The number of times it can be used for emergency braking is limited, and its life and reliability will be greatly reduced. The parking brake is generally normally closed, and emergency braking has a great impact on the transmission system, which may affect the life of the transmission system and bring a bad driving experience to the driver.

[0021] 2. When the whole machine is going downhill, the motor brake can slow down the roller. However, as the motor speed decreases, the motor braking force will decrease, making it impossible to brake the roller at a low speed, or the braking distance will be long. At this time, emergency braking intervention is still required to help the roller stop, and the life of the parking brake is still affected.

[0022] 3. Due to the limited braking capacity of the motor determined by the motor characteristics, the roller may not be able to obtain a constant and appropriate deceleration under conditions such as high speed or large slopes. The roller cannot achieve smooth braking, which affects the flatness of the asphalt pavement.

[0023] To this end, the present invention proposes an auxiliary braking system and control method for an electric-driven tire roller, which adds air valves, brakes, and brake discs to the original route for auxiliary braking, which can be used as auxiliary braking in the event of motor brake failure, and can also control the braking force to make the vehicle brake more stable, thereby avoiding damage to the road surface during compaction. By adding a brake at the output end of the drive motor, the whole machine controller adjusts the braking force in real time, thereby achieving the purpose of increasing the reliability of the braking system, ensuring construction safety, making the braking force control more stable, and improving the compaction flatness of the road surface.

[0024] Embodiment 1: This embodiment provides an auxiliary braking system for an electrically driven tire roller, comprising a driving motor 1, a transmission shaft 2, a brake 3, a brake disc 4, a driving axle 6, a driving wheel 7, a controller 8 and an air valve 9; The output shaft of the driving motor 1 is connected to the first end of the brake disc 4 through the transmission shaft 2, the second end of the brake disc 4 is connected to the input end of the driving axle 6, and the output end of the driving axle 6 is drivingly connected to the driving wheel 7; The brake 3 is connected to the air valve 9 through a pipeline, and the air valve has at least an inflation mode, a neutral mode and a deflation mode; when the air valve is in the inflation mode, the gas of the air source is transmitted to the brake 3 through the air valve 9, so that the brake caliper of the brake 3 clamps the brake disc and outputs an auxiliary braking force to the brake disc; when the air valve is in the neutral mode, the current auxiliary braking force is maintained; when the air valve is in the deflation mode, the gas in the brake 3 is discharged through the air valve 9, and the auxiliary braking force output by the brake caliper of the brake 3 to the brake disc is reduced or disappears; The driving motor 1 and the air valve 9 are respectively connected to the controller 8 by signals. In the present application, the working mode of the air valve 9 is controlled by the controller 8, so as to achieve the adjustment of the auxiliary braking force.

[0025] In this embodiment, the control method of the electric-driven tire roller further includes a brake bracket 5 , and the brake bracket 5 is fixed on the driving axle 6 . Furthermore, the brake disc 4 is mounted on the brake bracket 5 .

[0026] In this embodiment, the brake 3 is of normally open type.

[0027] In this embodiment, the braking force output by the brake to the brake disc is in a certain proportion to the gas in the brake 3 .

[0028] In this embodiment, the transmission shaft 2 , the brake disc 4 , the drive axle 6 and the output shaft of the drive motor 1 are installed coaxially.

[0029] It should be noted that the drive motor 1 is fixed on the machine body, connected to the battery (or generator) power supply through a high-voltage line, receives electrical energy from the whole machine, converts it into mechanical energy, outputs driving torque, and drives the wheels to travel. The electrical energy of the whole machine may come from a battery or a generator, etc. At the same time, the drive motor 1 is connected to and communicates with the controller 8 and is controlled by the controller 8.

[0030] When braking is required, the drive motor 1 outputs reverse torque to brake the roller. At this time, the drive motor is transformed into a generator, absorbing the kinetic energy from the whole machine (the inertia torque of the wheels) and converting it into electrical energy, and outputting the electrical energy to a battery or other power storage device.

[0031] The transmission shaft 2 is connected to the drive motor 1 at one end and the brake disc 4 at the other end, receives the torque of the drive motor and transmits it to the brake disc. At the same time, the transmission shaft can compensate for the position deviation between the drive motor and the drive axle caused by the manufacturing error of the structural parts.

[0032] The brake 3 is mounted on the brake bracket 5 and connected to the air valve 9 through a pipeline to receive high-pressure air from the air valve. When the high-pressure air from the air valve is injected into the brake, the brake clamp can output a clamping force to the brake disc, and the clamping force is proportional to the gas pressure. When the air valve is in the deflation mode, the high-pressure air in the brake can be discharged to the atmosphere through the air valve, and the brake clamp is released.

[0033] The brake disc 4 is respectively connected to the transmission shaft 2 and the input flange of the drive axle 6 at both ends to transmit torque thereto. At the same time, it can receive the clamping force from the brake 3, convert it into braking torque, and output it to the drive axle 6.

[0034] The driving axle 6 is connected to the fuselage to support the weight of the whole machine, and is also connected to the brake disc 4 to receive the torque from the brake disc and transmit it to the wheels, so that the whole machine can be driven or braked to stop.

[0035] The driving wheel 7, generally composed of a plurality of tires, is connected to the driving axle 6 to support the driving axle and receives the torque from the driving axle to drive or brake the roller.

[0036] The controller 8 is installed inside the whole machine, such as an electrical cabinet, etc. It is connected to the drive motor 1 (drive motor controller) and the gas valve 9 through electrical lines, and communicates in real time to monitor and control the drive motor torque, speed, voltage, current and other parameters. At the same time, the controller is connected and communicated with electrical components such as the speed control handle and the gas valve through electrical lines.

[0037] The air valve 9 is installed inside the fuselage and connected to and communicates with the controller through an electrical line. It is connected to the air source (air pump or air storage cylinder) and the brake 3 through air pipes to transmit high-pressure air. The air valve can have three states according to the instructions of the controller. In the inflation state, the air valve receives the high-pressure gas from the air source and transmits it to the brake to brake the brake; in the deflation mode, the air valve discharges the high-pressure gas in the brake to the atmosphere; in the neutral state, the air valve is in the middle position, neither inflating nor deflation. At the same time, the air valve can be connected to an external air pressure sensor to measure the air pressure value at the output end of the brake and transmit the air pressure value to the controller. According to the air pressure value received from the air valve, the controller determines which state the air valve should be in, namely, inflation, deflation, or neutral, and adjusts the brake air pressure, thereby adjusting the braking force output by the brake.

[0038] Under normal circumstances, when the roller is traveling at a certain speed, the driver adjusts the speed control handle to a specified position.

[0039] At this time, the controller 8 reads the handle information, obtains the driving speed requested by the handle, and converts it into a target speed of the drive motor.

[0040] The drive motor 1 runs at a certain speed, receives current from a power source (battery or generator), converts electrical energy into mechanical energy, and outputs torque to drive the transmission shaft and drive axle to make the whole machine move.

[0041] At the same time, the controller 8 reads the operation information of the drive motor, obtains the actual speed of the drive motor, and compares it with the target speed of the drive motor.

[0042] When there is a deviation in the comparison result, for example, the actual speed of the drive motor is lower than the target speed, the controller issues a command to increase the current of the drive motor, thereby increasing the output torque or speed of the drive motor, and vice versa.

[0043] The drive motor is controlled by the controller to obtain the appropriate voltage and current and maintain the specified speed. The whole machine runs at the specified speed under the drive motor.

[0044] When the roller needs to brake, the driver returns the speed control handle to the center or adjusts it to a low speed position.

[0045] At this time, the controller 8 reads the handle information, obtains the driving speed requested by the handle, and converts it into the target speed of the drive motor, sends a deceleration instruction to the drive motor, and executes motor braking.

[0046] At this time, the drive motor is transformed into a generator, absorbing the kinetic energy from the whole machine (the inertia torque of the wheels) and converting it into electrical energy, outputting reverse current, and outputting the electrical energy to a battery or other power storage device. The reverse current causes the drive motor to output reverse torque, which is transmitted to the drive axle 6 through the transmission shaft 2 and the brake disc 4 to brake the roller. The reverse torque value of the drive motor can be adjusted by changing the current, so that the roller can obtain reasonable braking force and reverse acceleration.

[0047] However, when the motor fails, the drive motor stops outputting the braking torque; or due to the low speed of the drive motor, the motor efficiency decreases and the braking torque decreases; or when the roller is braking on a steep slope or when the roller is braking at high speed on flat ground, the motor braking torque may be insufficient.

[0048] Embodiment 2: This embodiment provides an auxiliary braking control method for an electric-driven tire roller, the control method comprising: When the driving motor fails to brake and stops outputting braking torque, or the braking torque output by the driving motor is insufficient; The controller 8 obtains the target speed of the drive motor and the actual speed of the drive motor, calculates the actual reverse acceleration according to the actual speed of the drive motor, calculates the target reverse acceleration according to the target speed of the drive motor and the actual speed of the drive motor, and determines the target reverse acceleration range according to the error; In response to the actual reverse acceleration being less than the lower limit of the target reverse acceleration, the controller sends a command to control the air valve 9 to open to the inflation mode to inflate the brake. The brake caliper of the brake clamps the brake disc and outputs auxiliary braking force to the brake disc. The brake disc converts the braking force into braking torque and transmits it to the drive wheel 7 through the drive axle, causing the roller to slow down and brake.

[0049] During the auxiliary braking process, in response to the actual reverse acceleration being within the target reverse acceleration range, the controller issues an instruction to control the air valve to switch to the neutral mode, neither inflating nor deflating, thereby maintaining the current auxiliary braking force.

[0050] During the auxiliary braking process, in response to the actual reverse acceleration being greater than the upper limit of the target reverse acceleration, the controller sends an instruction to control the air valve to switch to the bleed mode, discharges the gas in the brake, reduces or eliminates the force of the brake caliper clamping the brake disc, reduces or eliminates the auxiliary braking force output to the brake disc, and reduces or eliminates the braking torque transmitted to the drive wheel 7 through the drive axle, thereby reducing the braking force of the road roller.

[0051] In this embodiment, when the motor fails, the motor stops outputting the braking torque; or due to the low motor speed, the motor efficiency decreases and the braking torque decreases; or the braking condition of the roller when driving on a large slope, or the braking condition of the roller when driving at high speed on flat ground, the motor braking torque may be insufficient. At this time, the controller 8 reads the handle information, obtains the driving speed requested by the handle, and calculates that the roller does not obtain a reasonable reverse acceleration through the monitored motor speed. The controller sends a command to the air valve to control the air valve to open to the inflation mode. The air valve 9 is opened to the inflation mode, and the high-pressure air of the whole machine air source is output to the brake. The brake 3 receives the high-pressure air from the air valve, and the brake caliper clamps the brake disc and outputs the braking force to the brake disc. The brake disc 4 is subjected to the clamping force of the brake, which is converted into the braking torque and output to the drive axle. The drive axle 6 receives the braking torque transmitted by the brake disc, which is transmitted to the tire and converted into the braking force of the whole machine, so that the roller decelerates and brakes.

[0052] Controller 8 reads the motor speed and the vehicle speed requested by the handle in real time. When the reverse acceleration of the whole machine is too large, it means that the braking force exceeds the required range. The controller sends a command to the air valve to control the air valve to open to the bleed mode. Air valve 9 opens to the bleed mode to discharge the high-pressure air in the brake to the atmosphere. The high-pressure air in the brake 3 is discharged to the air valve, the force of the brake caliper clamping the brake disc is reduced or disappears, and the braking force output to the brake disc is reduced or disappears. The output torque received by the drive axle from the brake disc is reduced or disappears, and the braking force of the whole machine is reduced.

[0053] In some embodiments, the controller can also read the air pressure value of the air pressure sensor at the air valve to determine whether the air valve is in inflation, deflation or neutral mode, which serves as feedback information for air valve control to ensure the accuracy of control.

[0054] Embodiment 3: This embodiment provides an auxiliary braking system for an electric-driven tire roller, wherein the controller comprises a memory and a processor, wherein the memory is used to store instructions, and the instructions are used to control the processor to operate so as to execute the auxiliary braking control method for the electric-driven tire roller according to Embodiment 2.

[0055] The auxiliary braking system provided in the present application serves as a supplement to the motor braking, so that the whole machine can obtain a stable and ideal braking force.

[0056] Embodiment 4: This embodiment provides an electric-driven tire roller, comprising the electric-driven tire roller auxiliary braking system described in the first aspect or the third aspect.

[0057] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0058] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An auxiliary braking system for an electric-driven tire roller, characterized in that: It includes a drive motor, a transmission shaft, a brake, a brake disc, a drive axle, a drive wheel, a controller and an air valve; The output shaft of the driving motor is connected to the first end of the brake disc through the transmission shaft, the second end of the brake disc is connected to the input end of the driving axle, and the output end of the driving axle is drivingly connected to the driving wheel; The brake is connected to the air valve through a pipeline, and the air valve has an inflation mode, a neutral mode and a deflation mode; when the air valve is in the inflation mode, the gas of the air source is transmitted to the brake through the air valve, so that the brake caliper of the brake clamps the brake disc and outputs auxiliary braking force to the brake disc; when the air valve is in the neutral mode, the current auxiliary braking force is maintained; when the air valve is in the deflation mode, the gas in the brake is discharged through the air valve, and the auxiliary braking force output by the brake caliper to the brake disc is reduced or disappears; The driving motor and the air valve are respectively connected to the controller signal.

2. The electric-driven tire roller auxiliary braking system according to claim 1, characterized in that: Also included is a brake bracket, which is fixed on the drive axle.

3. The electric-driven tire roller auxiliary braking system according to claim 2, characterized in that: The brake disc is mounted on the brake support.

4. The electric-driven tire roller auxiliary braking system according to claim 1, characterized in that: The brake is normally open.

5. The electric-driven tire roller auxiliary braking system according to claim 1, characterized in that: The braking force output by the brake to the brake disc is in a certain proportion to the gas in the brake.

6. An auxiliary braking control method for an electric-driven tire roller, characterized in that: The control method comprises: When the driving motor fails to brake and stops outputting braking torque, or the braking torque output by the driving motor is insufficient; The controller obtains the target speed of the drive motor and the actual speed of the drive motor, calculates the actual reverse acceleration according to the actual speed of the drive motor, calculates the target reverse acceleration according to the target speed of the drive motor and the actual speed of the drive motor, and determines the target reverse acceleration range according to the error; In response to the actual reverse acceleration being less than the lower limit of the target reverse acceleration, the controller sends a command to control the air valve to open to the inflation mode to inflate the brake. The brake caliper of the brake clamps the brake disc and outputs auxiliary braking force to the brake disc. The brake disc converts the braking force into braking torque and transmits it to the drive wheel through the drive axle, causing the roller to slow down and brake.

7. The auxiliary braking control method of an electric-driven tire roller according to claim 6, characterized in that: Also includes: During the auxiliary braking process, in response to the actual reverse acceleration being within the target reverse acceleration range, the controller issues an instruction to control the air valve to switch to the neutral mode, neither inflating nor deflating, thereby maintaining the current auxiliary braking force.

8. The auxiliary braking control method of an electric-driven tire roller according to claim 6, characterized in that: Also includes: During the auxiliary braking process, in response to the actual reverse acceleration being greater than the upper limit of the target reverse acceleration, the controller sends an instruction to control the air valve to switch to the bleeding mode, discharges the gas in the brake, reduces or eliminates the force of the brake caliper clamping the brake disc, reduces or eliminates the auxiliary braking force output to the brake disc, and reduces or eliminates the braking torque transmitted to the drive wheel through the drive axle, thereby reducing the braking force of the road roller.

9. An auxiliary braking system for an electric-driven tire roller, characterized in that: The controller includes a memory and a processor, the memory is used to store instructions, and the instructions are used to control the processor to operate so as to execute the auxiliary braking control method of the electric-driven tire roller according to any one of claims 6 to 8.

10. An electrically driven tire roller, characterized in that: It comprises the auxiliary braking system of an electrically driven tire roller as described in any one of claims 1 to 5 and 9.

Images