Hydraulic brake control system for reducing turning radius of vehicle and vehicle

Abstract

The utility model discloses a hydraulic brake control system capable of reducing the turning radius of a vehicle and the vehicle, and belongs to the technical field of vehicle control, the control system comprises a control element and a control switch, a first oil port of the control element is connected to a brake master pump of the vehicle and used for receiving pressure oil of the brake master pump, and a second oil port of the control element is connected to the control switch; the second oil port is connected to a left brake of the vehicle and used for conveying the pressure oil liquid to the left brake under a specific working condition to brake wheels on the left side, and the third oil port is connected to a right brake of the vehicle and used for conveying the pressure oil liquid to the right brake under the specific working condition to brake wheels on the right side; the control switch is connected with a controller of the vehicle, the controller reads the steering angle of a steering wheel of the vehicle after the control switch is turned on, and the controller controls the control element to be powered on and powered off according to the steering angle, so that a valve element of the control element is located at different working positions. Through the system, the turning radius can be reduced when the vehicle turns, and the passing performance of the vehicle in a narrow space is improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle control technology, and in particular to a hydraulic braking control system and vehicle for reducing the turning radius of a vehicle. Background Technology

[0002] Forklifts are industrial vehicles widely used in logistics, warehousing, and manufacturing. In existing forklift braking systems, when the driver presses the brake pedal, hydraulic fluid in the tank is pressurized through the master cylinder and flows through hoses to the left and right brakes, achieving service braking. For the steering system, the driver steers the rear axle by operating the steering wheel. The turning radius is affected by the vehicle's wheelbase and the rear wheel steering angle. In densely stacked warehouses and narrow storage aisles, the forklift's path is often obstructed. Furthermore, due to the limited turning radius, repeated adjustments to the vehicle are necessary, sometimes even requiring frequent detours to complete the turn, increasing wasted work time. Utility Model Content

[0003] To address some or all of the technical problems existing in the prior art, this utility model provides a hydraulic braking control system and vehicle for reducing the turning radius of a vehicle, which enables the vehicle to reduce its turning radius and improve its passability in narrow spaces without changing its overall layout and size.

[0004] The technical solution of this utility model is as follows:

[0005] In a first aspect, a hydraulic braking control system for reducing the turning radius of a vehicle is provided, comprising:

[0006] The control element has a first port connected to the vehicle's master brake cylinder for receiving pressurized hydraulic fluid from the master brake cylinder, a second port connected to the vehicle's left brake for delivering pressurized hydraulic fluid to the left brake under specific operating conditions to brake the left wheel of the vehicle, and a third port connected to the vehicle's right brake for delivering pressurized hydraulic fluid to the right brake under specific operating conditions to brake the right wheel of the vehicle.

[0007] A control switch is connected to the vehicle's controller. When the control switch is turned on, the controller reads the steering angle of the vehicle's steering wheel and, based on the steering angle, controls the energization and de-energization of the control element, so that the valve core of the control element is in different working positions.

[0008] In some alternative implementations, the control element includes a solenoid directional valve.

[0009] In some alternative implementations, the control element includes a three-position four-way solenoid valve.

[0010] Furthermore, the hydraulic braking control system for reducing the turning radius of a vehicle also includes an oil tank, which is connected to the master brake cylinder.

[0011] Secondly, a vehicle is provided, on which the aforementioned hydraulic braking control system for reducing the turning radius of the vehicle is installed.

[0012] The main advantages of this utility model's technical solution are as follows:

[0013] This utility model discloses a hydraulic braking control system and vehicle for reducing vehicle turning radius. Through the structure of the control element and control switch, by positioning the valve core of the control element in different working positions, a wheel speed difference is created between the left and right wheels of the front axle during braking. This causes the wheel speed on the braking side to be lower than that on the non-braking side, resulting in an additional steering tendency when the vehicle turns, causing the steering center to shift inward along the front axle axis. Specifically, when the control switch is on, the controller reads the steering angle of the vehicle's steering wheel and controls the energization state of the corresponding coil of the control element according to the steering angle, switching the valve core of the control element to the corresponding working position. When the control switch is off, the control element is de-energized, its valve core is in the neutral position, and pressurized hydraulic fluid is simultaneously delivered to the left and right brakes through the control element to achieve conventional braking. Thus, without changing the vehicle's wheelbase, steering angle, or other hardware parameters, the turning radius is effectively reduced, improving the vehicle's ability to pass through narrow spaces. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0015] Figure 1 A schematic diagram of a hydraulic braking control system for reducing the turning radius of a vehicle, provided as an embodiment of this utility model;

[0016] Figure 2 A schematic diagram of a control element in a hydraulic braking control system for reducing the turning radius of a vehicle, provided as an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of a hydraulic braking control system for reducing the turning radius of a vehicle, provided as an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Control element; 2. Control switch; 3. Master cylinder; 4. Left brake; 5. Right brake; 6. Controller; 7. Oil tank; 8. Pedal. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] The following is combined with Figure 1 -Appendix Figure 3 This document provides a detailed description of the technical solutions provided in the embodiments of this utility model.

[0022] As attached Figure 1 -Appendix Figure 3 As shown, to improve a vehicle's maneuverability in confined spaces, the turning radius is typically reduced by decreasing the wheelbase and increasing the steering axle angle. However, due to the limitations imposed by the vehicle's lifting capacity and spatial layout, it is difficult to further improve steering performance using existing methods. Therefore, this utility model provides a hydraulic braking control system for reducing the vehicle's turning radius. By reducing the vehicle's turning radius, the system effectively improves its maneuverability and simultaneously increases its operational efficiency. The system includes: a control element 1 and a control switch 2, wherein:

[0023] The first port of control element 1 is connected to the vehicle's master brake cylinder 3 to receive pressurized hydraulic fluid from the master brake cylinder 3. The second port of control element 1 is connected to the vehicle's left brake 4 to deliver pressurized hydraulic fluid to the left brake 4 under specific operating conditions for braking the left wheel of the vehicle. The third port of control element 1 is connected to the vehicle's right brake 5 to deliver pressurized hydraulic fluid to the right brake 5 under specific operating conditions for braking the right wheel of the vehicle. Control switch 2 is connected to the vehicle's controller 6. After control switch 2 is turned on, controller 6 reads the steering angle of the vehicle's steering wheel and controls the energization and de-energization of control element 1 according to the steering angle, so that the valve core of control element 1 is in different working positions.

[0024] Specifically, when the control switch 2 is turned on, the controller 6 reads the steering angle of the vehicle's steering wheel and controls the energization state of the control element 1 according to the steering angle, so that the valve core of the control element 1 switches to the corresponding working position; when the control switch 2 is turned off, the control element 1 is in a de-energized state, its valve core is in the neutral position, and the pressure oil is simultaneously delivered to the left brake 4 and the right brake 5 through the control element 1 to achieve normal braking.

[0025] Specifically, in this embodiment of the invention, a specific working condition includes when the driver maneuvers the vehicle through a narrow space where normal steering mode is insufficient. In this case, the driver presses the small turn mode switch to switch to the small turn steering mode and maneuvers the vehicle to complete the turn.

[0026] In some optional implementations of this embodiment, the control element 1 includes a solenoid directional valve, preferably a three-position four-way solenoid directional valve.

[0027] In some alternative implementations of this embodiment, an oil tank 7 is also included, and the oil tank 7 is connected to the master brake cylinder 3.

[0028] With this configuration, by connecting the oil tank 7 to the brake master cylinder 3, the oil tank 7 can provide oil reserves for the brake master cylinder 3. When the driver presses the brake pedal 8, the oil in the oil tank 7 can generate pressure under the action of the brake master cylinder 3, thereby providing a source of oil for the subsequent delivery of pressurized oil to the brake through the control element 1.

[0029] Specifically, the first port of the electromagnetic directional valve is connected to the master cylinder 3 via an oil pipe, receiving pressurized hydraulic fluid from the master cylinder 3. When the driver depresses the brake pedal 8, the hydraulic fluid in the tank 7 is pressurized by the master cylinder 3 and enters the electromagnetic directional valve through this port. The second port of the electromagnetic directional valve is connected to the left brake 4 via an oil pipe, used to deliver pressurized hydraulic fluid to the left brake 4 under specific operating conditions to brake the left wheel. For example, when the driver operates the forklift to turn left and is in a tight turn mode, the electromagnetic directional valve YA1 is energized, the valve core is in the left position, and pressurized hydraulic fluid enters the left brake 4 through this port. The third port of the electromagnetic directional valve is connected to the right brake 5 via an oil pipe, used to deliver pressurized hydraulic fluid to the right brake 5 under specific operating conditions to brake the right wheel. For example, when the driver operates the forklift to turn right and is in a tight turn mode, the electromagnetic directional valve YA2 is energized, the valve core is in the right position, and pressurized hydraulic fluid enters the right brake 5 through this port.

[0030] By selectively braking using the different braking methods described above, a wheel speed difference is created between the left and right wheels of the vehicle's front axle. This causes the wheel speed on the braking side to be lower than that on the non-braking side, resulting in an additional steering tendency when the vehicle is turning. This causes the steering center to shift inward along the front axle axis, thereby effectively reducing the turning radius and improving the vehicle's ability to pass through narrow spaces without changing the vehicle's wheelbase, steering angle, or other hardware parameters.

[0031] In summary, taking forklift operation as an example and combining practical applications, the principle of this utility model's hydraulic braking control system for reducing vehicle turning radius includes:

[0032] When the driver operates the forklift in a spacious working environment, there is no need to press the small turn mode button switch. At this time, the solenoid valve is de-energized and the valve core is in the neutral position. When the driver presses the brake pedal 8, the oil in the oil tank 7 generates a certain pressure through the brake master cylinder 3, and flows into the left brake 4 and right brake 5 through the oil pipes respectively to realize the service braking of the forklift.

[0033] When the driver operates the forklift through a narrow space, pressing the small turn mode button switch will cause the controller 6 to control the position of the valve core in the solenoid valve by reading the steering wheel angle. For example, if the steering wheel is turned to the left with an angle of "+", the solenoid valve YA1 will be energized and the valve core will be in the left position; if the steering wheel is turned to the right with an angle of "-", the solenoid valve YA2 will be energized and the valve core will be in the right position.

[0034] like Figure 2 and Figure 3 As shown, taking the driver manipulating the forklift to turn left as an example, when the steering wheel is turned to the left at an angle of "+", the solenoid valve YA1 is energized. When the driver presses the brake pedal 8, the oil in the oil tank 7 generates a certain pressure through the brake master cylinder 3. The controller 6 controls the YA1 in the control element 1 to be energized. Figure 2 When the P port and A port of the three-position four-way solenoid directional valve shown are connected, hydraulic fluid enters the left brake, causing the vehicle's left wheel to brake and decelerate. Figure 2 When the B and T ports of the three-position four-way solenoid directional valve shown are connected, the oil in the right brake 5 is discharged back to the oil tank, allowing the right wheel of the vehicle to roll freely. This results in a wheel speed difference between the left and right wheels of the front axle, with the right wheel having a higher wheel speed than the left. This causes the vehicle to tend to turn to the left, causing the vehicle body to veer to the left. At this time, the vehicle's steering center shifts inward along the front axle axis from the Ackermann theoretical steering center point, effectively reducing the forklift's turning radius.

[0035] Secondly, this utility model embodiment also provides a vehicle equipped with the aforementioned hydraulic braking control system for reducing the turning radius of the vehicle.

[0036] Therefore, the vehicle provided in this embodiment can reduce the turning radius of the vehicle without changing the overall layout and size, improve the vehicle's ability to pass through narrow spaces, improve operating or work efficiency, and ensure the safety of the vehicle when turning.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, the terms "front," "back," "left," "right," "upper," and "lower" in this document refer to the placement shown in the accompanying drawings.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hydraulic braking control system for reducing the turning radius of a vehicle, characterized in that, include: The control element has a first port connected to the vehicle's master brake cylinder for receiving pressurized hydraulic fluid from the master brake cylinder, a second port connected to the vehicle's left brake for delivering pressurized hydraulic fluid to the left brake under specific operating conditions to brake the left wheel of the vehicle, and a third port connected to the vehicle's right brake for delivering pressurized hydraulic fluid to the right brake under specific operating conditions to brake the right wheel of the vehicle. A control switch is connected to the vehicle's controller. When the control switch is turned on, the controller reads the steering angle of the vehicle's steering wheel and, based on the steering angle, controls the energization and de-energization of the control element, so that the valve core of the control element is in different working positions.

2. The hydraulic braking control system for reducing the turning radius of a vehicle according to claim 1, characterized in that, The control element includes a solenoid directional valve.

3. A hydraulic braking control system for reducing the turning radius of a vehicle according to claim 1, characterized in that, The control element includes a three-position four-way solenoid valve.

4. A hydraulic braking control system for reducing the turning radius of a vehicle according to claim 1, characterized in that, It also includes an oil tank, which is connected to the master cylinder.

5. A vehicle, characterized in that, The vehicle is equipped with a hydraulic braking control system for reducing the turning radius of the vehicle as described in any one of claims 1-4.

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