Vehicle long downhill braking system and vehicle long downhill braking method

Abstract

This invention discloses a vehicle braking system and method for long downhill driving, used to reduce the braking distance required when a heavy transport vehicle is braking on a long downhill slope. It includes a friction sensor mounted on the brake pads to sense changes in the friction force acting on the heavy transport vehicle; a shear-thickening liquid storage tank containing shear-thickening liquid; a spray device mounted above the wheels, connected to the shear-thickening liquid storage tank and used to spray the shear-thickening liquid onto the wheels; and a control device containing a control circuit connected to the friction sensor and used to trigger the spray device by adjusting the current. This invention can reduce the braking distance during long downhill braking.

Description

Technical Field

[0001] This invention relates to the field of transportation, and specifically discloses a vehicle braking system and method for long downhill driving. Background Technology

[0002] Oversized transport vehicles are a common type of transportation in road transport, characterized by their large size, weight, and load capacity. When these vehicles are descending a long slope, it is often necessary to keep the brakes on at all times to prevent them from speeding up and losing control.

[0003] However, during long-distance braking, heavy transport vehicles often generate a lot of heat due to the friction between their wheels and the road surface, which can cause significant wear on the tires.

[0004] In view of this, there is an urgent need for a system and method suitable for braking heavy transport vehicles on long downhill slopes, in order to reduce their braking distance under long downhill braking conditions. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a system and method for braking heavy transport vehicles on long downhill slopes, so as to reduce their braking distance under long downhill braking conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] Based on the above-mentioned technical problems, the purpose of this invention is to provide a vehicle long downhill braking system and a vehicle long downhill braking method, which can reduce the required braking distance when a heavy transport vehicle is braking on a long downhill slope.

[0008] In a first aspect, the present invention provides a vehicle braking system for long downhill slopes, characterized in that it is applied to heavy-duty transport vehicles and includes:

[0009] A friction sensor mounted on the brake pads is used to sense changes in the friction force experienced by the heavy transport vehicle.

[0010] A shear-thickening liquid storage tank, wherein the shear-thickening liquid storage tank is filled with shear-thickening liquid;

[0011] A spraying device installed above the wheel is connected to the shear-thickening liquid storage tank and is used to spray the shear-thickening liquid onto the wheel.

[0012] A control device, wherein a control circuit is provided within the control device, the control circuit being connected to the friction sensor and used to trigger the spraying device by adjusting the current.

[0013] In one specific embodiment, shear springs are respectively provided on three sides of the shear thickening liquid storage tank. The shear springs are arranged vertically along the bottom surface of the shear thickening liquid storage tank, along the front direction of the heavy transport vehicle, and along the rear direction of the heavy transport vehicle, and are used to release the shear force of the shear thickening liquid in the shear thickening liquid storage tank.

[0014] In one specific embodiment, the shear-thickening liquid uses nano-silica as the dispersed phase and a polar solvent as the dispersion medium; the spraying device is installed 20cm above the wheel.

[0015] In one specific embodiment, the friction sensor is a sliding rheostat sensor with a range of 0~100kN and a sliding resistance range of 0~100Ω.

[0016] In one specific embodiment, a polarized electrolytic capacitor is connected in parallel with the sliding rheostat sensor in the control circuit. When the resistance value of the sliding resistor in the sliding rheostat sensor increases with the braking time, the current in the polarized electrolytic capacitor increases accordingly.

[0017] In one specific embodiment, the power supply of the control circuit is the on-board power supply of the heavy transport vehicle, and the voltage of the on-board power supply is 24V.

[0018] In one specific embodiment, the spraying device is provided with multiple liquid transport pipes arranged along the vertical direction of the vehicle, wherein the orifice diameter of each liquid transport pipe is not less than 10 times the diameter of the dispersion phase of the shear-thickening liquid.

[0019] Secondly, this application provides a method for braking a vehicle on a long downhill slope, the method being applied to a control device in a vehicle long downhill braking system as described in any of the first aspects above, comprising:

[0020] The friction sensor is used to obtain the braking friction force of the heavy transport vehicle during the braking period.

[0021] Calculate the total resistance change in the control circuit based on the braking friction force;

[0022] Until the total resistance change reaches a preset resistance threshold, the spraying device is triggered to spray shear-thickening liquid onto the wheels of the heavy transport vehicle to increase the viscosity between the wheels and the road surface.

[0023] In one specific embodiment, calculating the total resistance change in the control circuit based on the braking friction force includes:

[0024] During the braking time period, the friction force value obtained by the friction force sensor at each moment is used to determine the corresponding change in resistance value in the control circuit, and the resistance values ​​are superimposed to obtain the total resistance change value of the control circuit at each moment.

[0025] In one specific embodiment, after triggering the spraying device to spray the shear-thickening liquid onto the wheels of the heavy transport vehicle, the method further includes:

[0026] The friction sensor is used to monitor the subsequent friction force of the heavy transport vehicle in real time.

[0027] In response to the total resistance change corresponding to the subsequent friction force being less than the preset resistance threshold again, the spray device is triggered to shut down.

[0028] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0029] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0030] Figure 1 This is a schematic diagram of the vehicle braking system for long downhill slopes according to the present invention;

[0031] Figure 2 This is a schematic diagram of the system spraying shear-thickening liquid in this invention;

[0032] Figure 3 This is a schematic diagram of a shear-thickening liquid storage tank;

[0033] Figure 4 This is a schematic diagram of a friction sensor and a capacitive switch connected in parallel;

[0034] Figure 5 This is a flowchart of the steps of the vehicle braking method for long downhill slopes according to the present invention. Detailed Implementation

[0035] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the present invention provides a vehicle long downhill braking system 10, which is applied to a heavy-duty transport vehicle and includes:

[0037] Friction sensor 1 is installed on the brake pads, and the friction sensor is used to sense the change in friction force on the heavy transport vehicle.

[0038] Shear-thickening liquid storage tank 2, wherein shear-thickening liquid is provided inside shear-thickening liquid;

[0039] A spraying device 3 is installed above the wheel, the spraying device 3 is connected to the shear thickening liquid storage tank 2, and is used to spray the shear thickening liquid onto the wheel;

[0040] The control device 4 is equipped with a control circuit, which is connected to the friction sensor 1 and is used to trigger the spray device 3 by adjusting the current.

[0041] In one specific embodiment, the shear-thickening liquid uses nano-silica as the dispersed phase and a polar solvent as the dispersion medium; the spraying device is installed 20cm above the wheel.

[0042] In one specific embodiment, the friction sensor is a sliding rheostat sensor with a range of 0~100kN and a sliding resistance range of 0~100Ω.

[0043] In one specific embodiment, the spraying device is provided with multiple liquid transport pipes arranged along the vertical direction of the vehicle, wherein the orifice diameter of each liquid transport pipe is not less than 10 times the diameter of the dispersion phase of the shear-thickening liquid.

[0044] Based on the above method, the vehicle long downhill actuation system can spray a shear-thickening liquid onto the heavy-duty transport vehicle, such as... Figure 2 As shown, see details. Figure 2 In the diagram, 21 is a shear-thickening liquid storage tank, 22 is a spraying device, 23 is the shear-thickening liquid, 24 is a liquid transport pipe connected to the shear-thickening liquid storage tank, 25 is the shear-thickening liquid outlet, 26 is the wheel, and 27 is the axle. In this way, the shear-thickening liquid is sprayed above the wheel, thereby increasing the viscosity between the wheel and the ground and avoiding problems such as severe tire damage caused by excessive braking distance of heavy transport vehicles.

[0045] like Figure 3 As shown, in one specific embodiment, shear springs are respectively provided on three sides of the shear thickening liquid storage tank. The shear springs are arranged vertically along the bottom surface of the shear thickening liquid storage tank, along the front direction of the heavy transport vehicle, and along the rear direction of the heavy transport vehicle, and are used to release the shear force of the shear thickening liquid in the shear thickening liquid storage tank.

[0046] For details, please see Figure 3 In the diagram, 31 is a shear spring, 32 is a vertical baffle between the shear spring and the shearing thickening liquid, 33 is a horizontal baffle between the shear spring and the shearing thickening liquid, 34 is a vertical baffle fixing device, 35 is a vertical baffle supporting spring, and 36 is a movable baffle.

[0047] Optionally, a rectangular hole is drilled within the vertical movement range of the horizontal baffle. To ensure the area formed by the horizontal and vertical baffles is airtight, for the vertical baffle, a movable baffle is installed above and below the horizontal baffle. The width of this movable baffle is slightly larger than the width of the horizontal baffle and is arranged close to the vertical baffle. For the upper baffle, its upper edge is supported by a spring, and its lower edge contacts the horizontal baffle. For the lower baffle, its upper edge contacts the horizontal baffle, and its lower edge is supported by a spring.

[0048] Furthermore, in one specific embodiment, a polarized electrolytic capacitor is connected in parallel with the sliding rheostat sensor in the control circuit. When the resistance value of the sliding resistor in the sliding rheostat sensor increases with the braking time, the current in the polarized electrolytic capacitor increases accordingly.

[0049] Optionally, the polarized electrolytic capacitor is manufactured by stacking two aluminum sheets and two insulating films, bundling them, and then immersing them in an electrolyte to obtain the polarized electrolytic capacitor.

[0050] In one specific embodiment, the power supply of the control circuit is the on-board power supply of the heavy transport vehicle, and the voltage of the on-board power supply is 24V.

[0051] Specifically, the control circuit described in this application can be as follows: Figure 4 As shown, see details. Figure 4 41 is a friction sensor, 42 is a polarized electrolytic capacitor, and 43 is a power supply.

[0052] Based on the aforementioned vehicle long downhill braking system, this application provides a vehicle long downhill braking method. This method is applied to the control device in the aforementioned vehicle long downhill braking system, such as... Figure 5 As shown, it includes:

[0053] The friction sensor is used to obtain the braking friction force of the heavy transport vehicle during the braking period.

[0054] Calculate the total resistance change in the control circuit based on the braking friction force;

[0055] Until the total resistance change reaches a preset resistance threshold, the spraying device is triggered to spray shear-thickening liquid onto the wheels of the heavy transport vehicle to increase the viscosity between the wheels and the road surface.

[0056] Optionally, the spraying device can be triggered to spray shear-thickening liquid based on the braking time and the total resistance change. For example, if the braking time of the heavy transport vehicle exceeds 30 seconds and the total resistance change in the control circuit is large, the spraying device can be triggered to spray shear-thickening liquid onto the wheels of the heavy transport vehicle. After that, since the current in the control circuit has reached the corresponding threshold, even if the braking friction of the heavy transport vehicle continues to increase, the so-called total resistance change will not change.

[0057] In one specific embodiment, calculating the total resistance change in the control circuit based on the braking friction force includes:

[0058] During the braking time period, the friction force value obtained by the friction force sensor at each moment is used to determine the corresponding change in resistance value in the control circuit, and the resistance values ​​are superimposed to obtain the total resistance change value of the control circuit at each moment.

[0059] In one specific embodiment, after triggering the spraying device to spray the shear-thickening liquid onto the wheels of the heavy transport vehicle, the method further includes:

[0060] The friction sensor is used to monitor the subsequent friction force of the heavy transport vehicle in real time.

[0061] In response to the total resistance change corresponding to the subsequent friction force being less than the preset resistance threshold again, the spray device is triggered to shut down.

[0062] That is, when the braking friction of the heavy transport vehicle gradually decreases and the total change in resistance in the control circuit is again less than the preset resistance threshold, the corresponding current decreases to below the current threshold required to trigger the spray device, and the spray device is turned off. After that, the brake pads of the heavy transport vehicle and the resistors in the control circuit return to their initial state.

[0063] Based on the above, the present invention provides a vehicle long downhill braking system and a vehicle long downhill braking device suitable for braking of heavy transport vehicles on long downhill slopes. Specifically, when the heavy transport vehicle brakes on a long downhill slope, a shear thickening liquid is sprayed onto its wheels to increase the adhesion between the wheels and the ground, preventing the braking distance of the heavy transport vehicle from being too long on a long downhill slope, thereby avoiding adverse effects such as serious tire damage caused by overheating of the wheels.

[0064] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A vehicle braking system for long downhill slopes, characterized in that, Applied to heavy transport vehicles, including: A friction sensor mounted on the brake pads is used to sense changes in the friction force experienced by the heavy transport vehicle. A shear-thickening liquid storage tank, wherein the shear-thickening liquid storage tank is filled with shear-thickening liquid; A spraying device installed above the wheel is connected to the shear-thickening liquid storage tank and is used to spray the shear-thickening liquid onto the wheel. A control device, wherein a control circuit is provided within the control device, the control circuit being connected to the friction sensor and used to trigger the spraying device by adjusting the current; Shear springs are provided on three sides of the shear thickening liquid storage tank. The shear springs are arranged vertically along the bottom surface of the shear thickening liquid storage tank, along the front direction of the heavy transport vehicle, and along the rear direction of the heavy transport vehicle, and are used to release the shear force of the shear thickening liquid in the shear thickening liquid storage tank. The shear-thickening liquid uses nano-silica as the dispersed phase and a polar solvent as the dispersion medium; the spraying device is installed 20cm above the wheel. The friction sensor is a sliding rheostat sensor with a range of 0~100kN and a sliding resistance range of 0~100Ω. The control circuit has a polarized electrolytic capacitor connected in parallel with the sliding rheostat sensor. When the resistance of the sliding resistor in the sliding rheostat sensor increases with the braking time, the current in the polarized electrolytic capacitor increases accordingly. The friction sensor is used to obtain the braking friction force of the heavy transport vehicle during the braking period. Calculate the total resistance change in the control circuit based on the braking friction force; Until the total resistance change reaches a preset resistance threshold, the spraying device is triggered to spray shear-thickening liquid onto the wheels of the heavy transport vehicle to increase the viscosity between the wheels and the road surface. The calculation of the total resistance change in the control circuit based on the braking friction includes: During the braking time period, the friction force value obtained by the friction force sensor at each moment is used to determine the corresponding change in resistance value in the control circuit, and the resistance values ​​are superimposed to obtain the total resistance change value of the control circuit at each moment.

2. The system as described in claim 1, characterized in that, The power supply for the control circuit is the on-board power supply of the heavy transport vehicle, and the voltage of the on-board power supply is 24V.

3. The system as described in claim 1, characterized in that, The spraying device is equipped with multiple liquid transport pipes, which are arranged along the vertical direction of the vehicle. The diameter of each liquid transport pipe is not less than 10 times the diameter of the dispersion phase of the shear-thickening liquid.

4. The system as described in claim 1, characterized in that, After triggering the spraying device to spray shear-thickening liquid onto the wheels of the heavy transport vehicle, the method further includes: The friction sensor is used to monitor the subsequent friction force of the heavy transport vehicle in real time. In response to the total resistance change corresponding to the subsequent friction force being less than the preset resistance threshold again, the spray device is triggered to shut down.

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