Wheeled excavator and brake control system and control method thereof

Abstract

The present invention discloses a wheeled excavator and its brake control system and control method. The system includes: a brake control element and a plurality of controls, wherein: the brake control element is arranged between the brake pedal valve and the central rotating body of the wheeled excavator, connected with the front axle brake and the rear axle brake through the central rotating body oil circuit, and the control end of the brake control element is electrically connected with the controller of the wheeled excavator; the plurality of controls are arranged on the instrument in the wheeled excavator cab and connected with the controller of the wheeled excavator, and one or more of the plurality of controls are operated to enable the controller to control the brake control element to realize the switching of the wheeled excavator axle braking, mixed braking and motor braking, and the stepless adjustment of the sliding resistance from the minimum to the maximum when the wheeled excavator motor is braked. The present invention can solve the problem of brake failure caused by overheating of the friction plate, make the wheeled excavator braking safer and more reliable, and improve the service life of the brake system.

Description

Technical Field

[0001] The present invention relates to the technical field of excavators, and in particular to a wheeled excavator and a braking control system and a control method thereof. Background Art

[0002] At present, the driving brakes of wheeled excavators mostly use wet disc brakes. When the brake pedal is pressed, the brake pressure is transmitted to the front and rear axle brake devices. The friction plates and metal plates inside the brake devices are close to each other, and the friction between the friction plates and metal plates generates braking force to reduce the vehicle speed; the friction between the friction plates and metal plates will generate heat energy, heating the lubricating oil and the bridge housing; if the brakes are pressed for a long time, such as long downhill conditions, it is easy to cause high temperature of the axle, leading to problems such as seal failure; when the wheeled excavator is driven to a certain speed and the accelerator is released to glide, the hydraulic braking force will be generated under the action of the travel motor balance valve, and the vehicle will gradually slow down. However, different users have different requirements for sliding resistance or sliding distance, and the sliding distances of products from various OEMs are also different.

[0003] At present, the brake pedal valve of wheeled excavators is usually a double pressure reducing valve. The filling valve and accumulator provide a stable oil source for the brake pedal valve. The outlet of the brake pedal valve is connected to the front and rear axles through the oil circuit. By detecting the secondary pressure of the brake pedal valve, the front and rear brake pressures can be displayed on the instrument and the brake light signal can be obtained. The fault judgment of the brake system is limited to the detection of the filling pressure and the abnormal pressure alarm. The pressure after the brake pedal valve cannot be alarmed, which poses a certain risk. Summary of the invention

[0004] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a wheeled excavator and its braking control system and control method, which can solve the problem of brake failure caused by overheating of friction plates, make the braking of the wheeled excavator safer and more reliable, and improve the service life of the braking system.

[0005] The technical solution of the present invention is as follows:

[0006] In a first aspect, the present invention provides a wheel excavator braking control system, comprising:

[0007] A brake control element, which is disposed between a brake pedal valve and a central rotary body of the wheeled excavator, and is connected to a front axle brake and a rear axle brake through an oil circuit of the central rotary body, and a control end of the brake control element is electrically connected to a controller of the wheeled excavator;

[0008] Multiple controls, multiple of which are arranged on the instrument panel of the wheeled excavator cab and connected to the controller of the wheeled excavator. Operating one or more of the multiple controls enables the controller to control the brake control element to switch between the wheeled excavator bridge brake, mixed brake and motor brake, and control the displacement of the electric proportional travel motor to achieve stepless adjustment of the sliding resistance from minimum to maximum during the wheeled excavator motor braking.

[0009] Further, in the above-mentioned wheel excavator brake control system, the brake control element includes a brake control valve, and the brake control valve includes:

[0010] A first solenoid valve and a second solenoid valve, wherein

[0011] The first interface, the second interface, the third interface and the fourth interface of the first solenoid valve are correspondingly connected to the first interface, the second interface, the third interface and the fourth interface of the second solenoid valve through connecting lines;

[0012] The first interface of the first solenoid valve and the first interface connection line of the second solenoid valve are combined to form a first input end of the brake control element, and the first input end is connected to the output end of the brake foot valve of the wheel excavator;

[0013] The second interface of the first solenoid valve and the second interface connection line of the second solenoid valve are combined to form a second input end of the brake control element, and the second input end is connected to the output end of the brake foot valve of the wheel excavator;

[0014] The third interface of the first solenoid valve and the third interface connection line of the second solenoid valve are combined to form a first output end of the brake control element, and the first output end is connected to the front axle brake of the wheeled excavator;

[0015] The fourth interface of the first solenoid valve and the fourth interface connection line of the second solenoid valve are combined to form a second output end of the brake control element, and the second output end is connected to the rear axle brake of the wheeled excavator;

[0016] The electromagnetic control end of the first electromagnetic valve and the electromagnetic control end of the second electromagnetic valve are electrically connected to the wheel excavator controller.

[0017] Furthermore, in the above-mentioned wheel excavator braking control system, the plurality of controls include a braking mode control control and a sliding resistance control control, wherein:

[0018] The brake mode control component is used for switching between axle braking, mixed braking and motor braking of a wheeled excavator;

[0019] The sliding resistance control component is used for steplessly adjusting the sliding resistance from minimum to maximum during motor braking of a wheel excavator.

[0020] Furthermore, the above-mentioned wheeled excavator braking control system also includes a detection device, which is arranged on the wheeled excavator braking foot valve, and is electrically connected to the controller of the wheeled excavator for collecting and detecting the depression amount or pedaling angle of the brake pedal.

[0021] Furthermore, in the above-mentioned wheel excavator braking control system, the detection device includes an angle sensor.

[0022] Furthermore, in the above-mentioned wheel excavator braking control system, a speed sensor is also included. The speed sensor is arranged at the output end of the wheel excavator gearbox, and is used to detect the speed of the gearbox and transmit the detected speed data to the controller of the wheel excavator.

[0023] Furthermore, the above-mentioned wheeled excavator braking control system further includes a travel control valve, which is electrically connected to the controller and is used to control the on-off of the oil circuit to enable the wheeled excavator to brake in different braking modes.

[0024] Furthermore, in the above-mentioned wheel excavator braking control system, the travel motor includes an electric proportional travel motor.

[0025] Furthermore, in the above-mentioned wheel excavator braking control system, a travel pressure sensor is also included. The travel pressure sensor is arranged on the travel control valve. The travel pressure sensor is connected to the controller of the wheel excavator and is used to detect the travel pressure of the wheel excavator.

[0026] In a second aspect, the present invention provides a wheeled excavator, on which the wheeled excavator braking control system as described above is provided.

[0027] In a third aspect, the present invention provides a wheel excavator braking control method, comprising:

[0028] Enter the wheeled excavator to switch between different braking modes;

[0029] Operate one or more of the plurality of controls to control the brake control element at different control positions;

[0030] Wheeled excavators correspond to bridge braking, mixed braking and motor braking, as well as different sliding resistance levels according to different control positions of control elements.

[0031] The main advantages of the technical solution of the present invention are as follows:

[0032] The wheeled excavator braking control system of the present invention, through the structure of the braking control element and multiple controls, enables the braking control system of the present invention to realize the switching of the wheeled excavator bridge braking, mixed braking and motor braking by operating one or more of the multiple controls, and the stepless adjustment of the sliding resistance from minimum to maximum during the wheeled excavator motor braking, which can solve the problem of brake failure caused by overheating of the friction plate, make the braking of the wheeled excavator safer and more reliable, and improve the service life of the braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0034] Figure 1 A schematic diagram of a wheel excavator braking control system according to an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the structure of a brake control element in a brake control system for a wheeled excavator provided by an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the control principle of sliding resistance and sliding distance in a wheeled excavator braking control system provided by one embodiment of the present invention;

[0037] Figure 4 A schematic diagram of fault determination of a brake system in a brake control system of a wheeled excavator provided by an embodiment of the present invention;

[0038] Figure 5 A schematic flow chart of a braking control method for a wheeled excavator provided in accordance with an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Engine; 2. Main pump; 3. Main valve; 4. Accumulator; 5. Brake mode control component; 6. Rear brake pressure sensor; 7. Brake foot valve; 8. Angle sensor; 9. Front brake pressure sensor; 10. Brake control element; 10.1. First solenoid valve; 10.2. Second solenoid valve; 11. Travel control valve; 12. Center rotary body; 13. Electric proportional travel motor; 14. Speed ​​sensor; 15. Gearbox; 16. Controller; 17. Rear axle brake; 18. Front axle brake; 19. Travel pressure sensor; 20. Filling pressure sensor; 21. Sliding resistance control component; 22. Filling valve; 23. Brake pump; 24. Hydraulic oil tank. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] The following is combined with Figure 1-2 The embodiment of the present invention provides a wheel excavator brake control system, the system comprising: a brake control element 10 and a plurality of controls, wherein:

[0043] The brake control element 10 is arranged between the brake foot valve 7 and the center rotating body 12 of the wheeled excavator, and is connected to the front axle brake 18 and the rear axle brake 17 through the oil circuit of the center rotating body 12. The control end of the brake control element 10 is electrically connected to the controller 16 of the wheeled excavator; multiple controls are arranged on the instrument in the wheeled excavator cab and are connected to the controller 16 of the wheeled excavator. Operating one or more of the multiple controls enables the controller 16 to control the brake control element 10 to realize the switching of the wheeled excavator axle braking, mixed braking and motor braking, and control the displacement of the electric proportional travel motor 13, so as to realize the stepless adjustment of the sliding resistance from minimum to maximum during the wheeled excavator motor braking.

[0044] As an example, the stepless adjustment of the sliding resistance from minimum to maximum during motor braking of the above-mentioned wheeled excavator includes: motor braking torque = motor displacement × pressure. By adjusting the motor proportional valve through the sliding resistance control control unit, the motor displacement can be proportionally adjusted, that is, the motor braking torque can be proportionally adjusted, that is, the sliding resistance can be proportionally adjusted.

[0045] Therefore, the wheeled excavator braking control system of the present invention, through the structure of the braking control element 10 and multiple controls, enables the braking control system of the present invention to control the braking control element 10 by operating one or more of the multiple controls to achieve the switching of the wheeled excavator bridge braking, mixed braking and motor braking, and control the displacement of the electric proportional travel motor 13 during braking, thereby achieving stepless adjustment of the sliding resistance from minimum to maximum during wheeled excavator motor braking, and can solve the problem of brake failure caused by overheating of the friction plate, making the braking of the wheeled excavator safer and more reliable, and improving the service life of the braking system.

[0046] The multiple controls provided on the above-mentioned wheeled excavator cab instrument include but are not limited to buttons, knobs, touch keys, keys and push rods.

[0047] In some optional implementations of this embodiment, in order to facilitate operation and avoid confusion during operation, the above-mentioned controls can be set to one or more types. At the same time, in order to make the control panel simple, beautiful, small in space, and more ergonomically designed, the above-mentioned controls are set to two types, such as knobs and push rods.

[0048] Preferably, the motor is configured as an electric proportional travel motor 13 .

[0049] In this way, the travel motor adopts an electric proportional motor, so that the current size and the motor displacement change proportionally. The current of the travel motor can be adjusted accordingly according to the above-mentioned different control methods or different braking methods, so that the adjusted current size matches the motor displacement.

[0050] In addition, the above-mentioned method of using electric proportional motor braking can also avoid the problem of friction plate overheating.

[0051] Specifically, in the wheel excavator brake control system of the present invention, the brake control element 10 includes a brake control valve, and the brake control valve includes: a first solenoid valve 10.1 and a second solenoid valve 10.2, wherein:

[0052] The first interface, the second interface, the third interface and the fourth interface of the first solenoid valve 10.1 are connected to the first interface, the second interface, the third interface and the fourth interface of the second solenoid valve 10.2 through connecting lines; the first interface of the first solenoid valve 10.1 and the first interface connecting line of the second solenoid valve 10.2 are combined to form the first input end Q1 of the brake control element 10, and the first input end Q1 is connected to the output end Q of the brake foot valve 7 of the wheeled excavator; the second interface of the first solenoid valve 10.1 and the second interface connecting line of the second solenoid valve 10.2 are combined to form the second input end H1 of the brake control element 10, and the second input end H1 is connected to the output end Q of the brake foot valve 7 of the wheeled excavator. The output end H of the brake foot valve 7 of the wheeled excavator is connected; the third interface of the first solenoid valve 10.1 and the third interface connection line of the second solenoid valve 10.2 are combined to form the first output end Q2 of the brake control element 10, and the first output end Q2 is connected to the front axle brake 18 of the wheeled excavator; the fourth interface of the first solenoid valve 10.1 and the fourth interface connection line of the second solenoid valve 10.2 are combined to form the second output end H2 of the brake control element 10, and the second output end H2 is connected to the rear axle brake 17 of the wheeled excavator; the electromagnetic control end of the first solenoid valve 10.1 and the electromagnetic control end of the second solenoid valve 10.2 are electrically connected to the wheeled excavator controller 16.

[0053] In some optional implementations of this embodiment, the above-mentioned multiple controls include but are not limited to the braking mode control control 5 and the sliding resistance control control 21, wherein:

[0054] The braking mode control unit 5 is used for switching among axle braking, mixed braking and motor braking of the wheeled excavator; the sliding resistance control unit 21 is used for stepless adjustment of the sliding resistance from minimum to maximum during motor braking of the wheeled excavator.

[0055] As an example, the above-mentioned controls are set to be a braking mode control knob and a sliding resistance control knob.

[0056] Specifically, in the embodiment of the present invention, how to operate one or more of the multiple controls to enable the controller 16 to control the brake control element 10 to achieve the switching of the wheel excavator bridge brake, mixed brake and motor brake is described below in combination with Figure 1 and Figure 2 , for detailed description:

[0057] The driver operates the brake mode control knob to the axle brake and enters the axle brake mode. At this time, the solenoid valves Y1 and Y2 of the brake control valve are both de-energized, and the axle brake takes effect;

[0058] The driver operates the brake mode control knob to mixed braking, then enters mixed braking mode, the solenoid valve Y1 in the brake control valve is energized, Y2 is de-energized, and the bridge brake and motor brake take effect at the same time;

[0059] When the driver operates the brake mode control knob to motor braking, the motor braking mode is entered, and the solenoid valves Y1 and Y2 in the brake control valve are energized at the same time, cutting off the oil circuits of the brake foot valve 7 and the front and rear axle brake devices; at the same time, the front brake pressure sensor 9 and the rear brake pressure sensor 6 transmit the average pressure to the controller 16, and the controller 16 outputs the current signal to the proportional travel motor 13, and the motor displacement changes; the pedal angle of the brake foot valve 7 changes proportionally to the motor displacement.

[0060] It can be understood that, the greater the angle at which the driver controls the brake pedal valve 7, the greater the displacement of the travel motor and the greater the motor braking force.

[0061] In another optional implementation of the present embodiment, the wheeled excavator braking control system of the present invention further includes a detection device, which is arranged on the wheeled excavator braking foot valve 7. The detection device is electrically connected to the controller 16 of the wheeled excavator and is used to collect and detect the depression amount or pedaling angle of the brake pedal.

[0062] Preferably, the above-mentioned detection device includes an angle sensor 8 .

[0063] With such an arrangement, the angle of the driver's brake pedaling can be collected through the angle sensor 8 and connected to the control program to perform fault diagnosis of the brake system.

[0064] In another optional implementation of the present embodiment, the wheel excavator braking control system of the present invention further includes a speed sensor 14, which is arranged at the output end of the wheel excavator gearbox 15, for detecting the speed of the gearbox 15 and transmitting the detected speed data to the controller 16 of the wheel excavator.

[0065] With such an arrangement, the rotation speed of the gearbox 15 can be detected by the rotation speed sensor 14, and the detected rotation speed can be transmitted to the controller 16 for adjusting the brake control, so that the adjustment of the brake control is more accurate and reliable.

[0066] In another optional implementation of the present embodiment, the wheel excavator braking control system of the present invention further includes a travel control valve 11, which is electrically connected to the controller 16 and is used to control the on-off of the oil circuit to determine which braking mode the wheel excavator adopts.

[0067] In addition, the wheel excavator braking control system of the present invention can also realize the control of the sliding resistance and sliding distance of the wheel excavator.

[0068] Specifically, Figure 3 As shown, when the sliding resistance control knob is turned to a certain angle, an electrical signal is generated and transmitted to the controller 16. When the accelerator is released during driving, the front brake pressure sensor 9 and the rear brake pressure sensor 6 detect that the pressure is lower than the first preset pressure threshold, and the travel pressure sensor 19 detects that the travel pressure is lower than the second preset pressure threshold, and the transmission 15 speed sensor 14 detects that the speed is higher than the preset speed threshold, then the controller 16 will output an electrical signal to the electric proportional travel motor 13, and the travel motor will start braking at a certain displacement.

[0069] Such an arrangement can control the sliding resistance and sliding distance generated during the braking process of the wheeled excavator, making the braking of the wheeled excavator safer and more reliable and prolonging the service life of the braking system.

[0070] In addition, the wheel excavator brake control system of the present invention can also realize the fault diagnosis of the wheel excavator brake system.

[0071] Specifically, Figure 4 As shown, when the driver steps on the brake pedal valve 7, if the angle sensor 8 detects that the angle is greater than the preset angle threshold, and at the same time the front brake pressure sensor 9 and the rear brake pressure sensor 6 detect that the pressure is lower than or higher than the preset pressure value, the controller 16 outputs a signal to make an abnormal brake pressure alarm, and at the same time cuts off the power to the walking control valve 11 to limit the walking function, and at the same time makes a walking function restriction alarm; if the filling pressure sensor 20 detects that the pressure is lower than or higher than the preset pressure value, the controller 16 outputs a signal to make an abnormal filling pressure alarm.

[0072] Such an arrangement can detect whether there is a fault during the braking process of the wheel excavator, making the braking of the wheel excavator safer and more reliable, increasing the service life of the braking system, and ensuring braking safety.

[0073] In addition, in order to enable the wheeled excavator braking control system of the present invention to implement the above-mentioned technical scheme of the present invention more accurately, effectively and reliably, a front brake pressure sensor 9 and a rear brake pressure sensor 6 are also arranged on the brake pedal valve 7 of the wheeled excavator, which are respectively used to detect the brake pressures of the front axle brake 18 and the rear axle brake 17 of the wheeled excavator, wherein the front brake pressure sensor 9 is also connected to the first input end Q1 of the brake control element 10 and the output end Q of the brake pedal valve 7 of the wheeled excavator, and the rear brake pressure sensor 6 is also connected to the second input end H1 of the brake control element 10 and the output end H of the brake pedal valve 7 of the wheeled excavator. A travel pressure sensor 19 is also arranged on the travel control valve 11 of the wheeled excavator, and a filling pressure sensor 20 is arranged on the filling valve 22.

[0074] The present invention also includes an engine 1, a main pump 2, a main valve 3, an accumulator 4, a rear brake pressure sensor 6, a brake pedal valve 7, a front brake pressure sensor 9, a central rotary body 12, an electric proportional travel motor 13, a gearbox 15, a controller 16, a rear axle brake 17, a front axle brake 18, a filling pressure sensor 20, a filling valve 22, a brake pump 23 and a hydraulic oil tank 24, and their positional relationship and connection relationship are as shown in FIG. Figure 1-Figure 2 shown.

[0075] Therefore, the wheel excavator braking control system of the present invention, by setting the braking mode control control 5, the sliding resistance control control 21, the gearbox 15 speed sensor 14, the braking control element 10, etc., and using the electric proportional travel motor 13, plus the front brake pressure sensor 9, the rear brake pressure sensor 6, the travel pressure sensor 19, plus the appropriate control algorithm (the control algorithm is a general control algorithm well known to those skilled in the art, and the specific algorithm is determined according to the actual application), allows the user to control the displacement of the travel motor when stepping on the brake pedal, and rely on the hydraulic pressure to decelerate the vehicle. The kinetic energy of the vehicle will be converted into the heat energy of the hydraulic oil, and then the heat will be dissipated into the air through the oil flow and the heat dissipation system, thereby avoiding the problem of overheating of the axle caused by long-term braking and causing brake failure. By adopting the electric proportional motor braking method, the problem of friction plate overheating can be avoided, making the wheel excavator braking safer and more reliable; by detecting the front and rear brake pressures, the travel pressure, and the speed of the gearbox 15, the vehicle can achieve the corresponding sliding resistance and sliding distance according to the set sliding resistance gear when sliding, so as to meet different usage requirements and different customer needs. At the same time, in order to obtain a complete brake system fault diagnosis in the system of the present invention, a pedal sensing element, namely, an angle sensor 8, is added to the brake pedal valve 7. By detecting the working state of the angle sensor 8 and the front and rear brake pressures, and then processing the data through the controller 16, the working condition of the brake system can be judged, so as to make a fault alarm in time and remind the user to perform maintenance, thereby further ensuring the reliability of the wheel excavator braking and improving the service life of the brake system.

[0076] In a second aspect, the present invention provides a wheeled excavator, on which the wheeled excavator braking control system as described above is provided.

[0077] Such arrangement enables the wheeled excavator to operate one or more of the multiple controls, enabling the controller to control the brake control element to realize the switching of the wheeled excavator bridge braking, mixed braking and motor braking, as well as the stepless adjustment of the sliding resistance from minimum to maximum during the wheeled excavator motor braking, thereby solving the problem of brake failure caused by overheating of the friction plate, making the braking of the wheeled excavator safer and more reliable, and improving the service life of the braking system.

[0078] Thirdly, Figure 5 As shown, the present invention provides a wheel excavator braking control method, which includes the following steps S1-S3:

[0079] Step S1: entering the wheeled excavator to switch to different braking modes;

[0080] As an example, in the wheel excavator braking control method of the present invention, entering the wheel excavator to switch to different braking modes is achieved through a braking mode control knob, and the wheel excavator can be switched to different braking modes by turning the braking mode control knob.

[0081] Step S2: operating one or more of the plurality of controls to control the brake control element 10 to be in different control positions;

[0082] As an example, the control in the embodiment of the present invention includes at least a braking mode control control 5 and a sliding resistance control control 21, wherein the braking mode control control 5 is used for switching between axle braking, mixed braking and motor braking of the wheeled excavator; the sliding resistance control control 21 is used for stepless adjustment of the sliding resistance from minimum to maximum during motor braking of the wheeled excavator. By operating the above controls, the electromagnet of the braking control element 10 can be placed in different on-off states, and the proportional valve of the electric proportional travel motor 13 can be placed in different working positions, so that the wheeled excavator can be placed in different braking modes or sliding resistance sizes by operating one or more of the above controls.

[0083] Step S3: The wheeled excavator corresponds to bridge braking, mixed braking and motor braking according to different control positions of the control elements, as well as different sliding resistances.

[0084] Specifically, the bridge brake of a wheeled excavator includes:

[0085] The driver operates the brake mode control knob to the axle brake and enters the axle brake mode. At this time, the solenoid valves Y1 and Y2 of the brake control valve are both de-energized, and the axle brake takes effect;

[0086] Specifically, the hybrid braking of wheeled excavators includes:

[0087] The driver operates the brake mode control knob to mixed braking, then enters mixed braking mode, the solenoid valve Y1 in the brake control valve is energized, Y2 is de-energized, and the bridge brake and motor brake take effect at the same time;

[0088] Specifically, the motor brake of a wheeled excavator includes:

[0089] When the driver operates the brake mode control knob to motor braking, the motor braking mode is entered, and the solenoid valves Y1 and Y2 in the brake control valve are energized at the same time, cutting off the oil circuit between the brake foot valve 7 and the front and rear axle brake devices; at the same time, the front brake pressure sensor 9 and the rear brake pressure sensor 6 transmit the average pressure to the controller 16, and the controller 16 outputs the current signal to the proportional travel motor 13, and the motor displacement changes; the pedal angle of the brake foot valve 7 changes proportionally to the motor displacement; the larger the angle of the brake foot valve 7 controlled by the driver, the larger the travel motor displacement and the greater the motor braking force.

[0090] In summary, through the wheeled excavator braking control method of the present invention, it is possible to achieve switching among wheeled excavator bridge braking, mixed braking and motor braking, as well as stepless adjustment of the sliding resistance from minimum to maximum during wheeled excavator motor braking, thereby solving the problem of brake failure caused by overheating of the friction plate, making the braking of the wheeled excavator safer and more reliable and increasing the service life of the braking system.

[0091] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wheel excavator braking control system, characterized in that: include: A brake control element, which is disposed between a brake pedal valve and a central rotary body of the wheeled excavator, and is connected to a front axle brake and a rear axle brake through an oil circuit of the central rotary body, and a control end of the brake control element is electrically connected to a controller of the wheeled excavator; A plurality of controls are arranged on the instrument panel of the wheeled excavator cab and connected to the controller of the wheeled excavator. Operating one or more of the plurality of controls enables the controller to control the brake control element to realize the switching of the wheeled excavator bridge braking, mixed braking and motor braking, and control the displacement of the excavator travel motor to realize the stepless adjustment of the sliding resistance from minimum to maximum when the wheeled excavator motor is braked.

2. The wheel excavator braking control system according to claim 1, characterized in that: The brake control element comprises a brake control valve, and the brake control valve comprises: A first solenoid valve and a second solenoid valve, wherein The first interface, the second interface, the third interface and the fourth interface of the first solenoid valve are correspondingly connected to the first interface, the second interface, the third interface and the fourth interface of the second solenoid valve through connecting lines; The first interface of the first solenoid valve and the first interface connection line of the second solenoid valve are combined to form a first input end of the brake control element, and the first input end is connected to the output end of the brake foot valve of the wheel excavator; The second interface of the first solenoid valve and the second interface connection line of the second solenoid valve are combined to form a second input end of the brake control element, and the second input end is connected to the output end of the brake foot valve of the wheel excavator; The third interface of the first solenoid valve and the third interface connection line of the second solenoid valve are combined to form a first output end of the brake control element, and the first output end is connected to the front axle brake of the wheeled excavator; The fourth interface of the first solenoid valve and the fourth interface connection line of the second solenoid valve are combined to form a second output end of the brake control element, and the second output end is connected to the rear axle brake of the wheeled excavator; The electromagnetic control end of the first electromagnetic valve and the electromagnetic control end of the second electromagnetic valve are electrically connected to the wheel excavator controller.

3. The wheel excavator braking control system according to claim 1, characterized in that: The plurality of controls include a braking mode control control and a sliding resistance control control, wherein: The brake mode control component is used for switching between axle braking, mixed braking and motor braking of a wheeled excavator; The sliding resistance control component is used for steplessly adjusting the sliding resistance from minimum to maximum during motor braking of a wheel excavator.

4. The wheel excavator braking control system according to claim 1, characterized in that: It also includes a detection device, which is arranged on the brake pedal valve of the wheeled excavator. The detection device is electrically connected to the controller of the wheeled excavator and is used to collect and detect the depression amount or pedal angle of the brake pedal.

5. The wheel excavator braking control system according to claim 4, characterized in that: It also includes a travel control valve, which is electrically connected to the controller and is used to control the on-off of the oil circuit of the wheeled excavator so as to enable the wheeled excavator to brake in different braking modes.

6. The wheel excavator braking control system according to claim 1, characterized in that: It also includes a rotation speed sensor, which is arranged at the output end of the gearbox of the wheeled excavator and is used to detect the rotation speed of the gearbox and transmit the detected rotation speed data to the controller of the wheeled excavator.

7. The wheel excavator braking control system according to claim 1, characterized in that: The travel motor comprises an electric proportional travel motor.

8. The wheel excavator braking control system according to claim 1, characterized in that: It also includes a travel pressure sensor, which is arranged on the travel control valve and connected to the controller of the wheeled excavator to detect the travel pressure of the wheeled excavator.

9. A wheeled excavator, characterized in that: The wheeled excavator is provided with a wheeled excavator braking control system as described in any one of claims 1 to 8.

10. A wheel excavator braking control method, characterized in that: include: Enter the wheeled excavator to switch between different braking modes; Operate one or more of the plurality of controls to control the brake control element at different control positions; Wheeled excavators correspond to bridge braking, mixed braking and motor braking, as well as different sliding resistance levels according to different control positions of control elements.

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