Pure electric cleaning vehicle

Abstract

This application provides a pure electric cleaning vehicle. According to the pure electric cleaning vehicle provided by this application, when the pure electric cleaning vehicle is underpowered on a slope, the torque distribution controller can control the front drive component to start, so as to improve the overall driving force, reduce the workload of the rear drive component, make the rear drive component work at a suitable temperature, and improve the operational stability by matching the appropriate power output through axle load.

Description

Technical Field

[0001] This application relates to the field of pure electric environmental sanitation cleaning equipment technology, and in particular to a pure electric cleaning vehicle. Background Technology

[0002] With increasingly stringent environmental protection requirements and the continuous decline in the cost of new energy vehicles, the development of electric vehicles is attracting more and more attention. As an important type of sanitation equipment, the market demand for pure electric cleaning vehicles is also constantly increasing. However, due to the special nature of their operation in mountainous areas, pure electric cleaning vehicles require precise control of their power performance to ensure both power and safety.

[0003] In existing technologies, a central drive is typically used ( Figure 2 ) or rear axle drive axle ( Figure 3 However, this type of drive often ignores the actual working conditions of pure electric cleaning vehicles, which has an adverse effect on the performance and lifespan of the cleaning vehicles. Summary of the Invention

[0004] In view of this, this application provides a pure electric cleaning vehicle, which aims to solve the above-mentioned technical problems to a certain extent.

[0005] According to this application, a pure electric cleaning vehicle is provided, the pure electric cleaning vehicle comprising: First front wheel and second front wheel, A front-wheel drive assembly, which is drive-connected to the first front wheel and the second front wheel, and is used to provide power to the first front wheel and the second front wheel; First rear wheel and second rear wheel A rear-drive assembly, which is drive-connected to the first rear wheel and the second rear wheel, and is used to provide power to the first rear wheel and the second rear wheel; A torque distribution controller, which is communicatively connected to the front drive assembly and the rear drive assembly. The torque distribution controller controls the rear-drive assembly to drive the first and second rear wheels, thereby driving the pure electric cleaning vehicle. The torque distribution controller is further configured to control the front drive assembly to drive the first front wheel and the second front wheel when the rear drive assembly is operating at a power greater than the rated power of the rear drive assembly, so as to jointly drive the pure electric cleaning vehicle with the first rear wheel and the second rear wheel.

[0006] Based on the technical solutions described above, optionally, the front drive assembly includes a first drive structure and a second drive structure, the first drive structure being connected to the first front wheel drive, the second drive structure being connected to the second front wheel drive, and both the first drive structure and the second drive structure being communicatively connected to the torque distribution controller to drive the first front wheel and the second front wheel respectively.

[0007] Based on the technical solutions described above, optionally, the first drive structure is a first hub motor, and the second drive structure is a second hub motor.

[0008] Based on the technical solutions described above, optionally, the rear drive assembly is an electric drive axle. Here, the electric drive axle includes a motor for driving the first rear wheel and the second rear wheel.

[0009] Based on the technical solutions described above, optionally, the rear drive assembly is an electric drive axle, which simultaneously drives the first rear wheel and the second rear wheel.

[0010] Based on the technical solutions described above, optionally, the front drive assembly is a front drive axle, which simultaneously drives the first front wheel and the second front wheel.

[0011] Based on the technical solutions described above, optionally, the rear drive assembly is an electric drive axle, which simultaneously drives the first rear wheel and the second rear wheel.

[0012] Based on the technical solutions described above, the pure electric cleaning vehicle may optionally include a sensing element, which is disposed on at least one of the first rear wheel and the second rear wheel, and the sensing element is used to sense the working state of the first rear wheel and the second rear wheel; The sensing element is communicatively connected to the torque distribution controller, and the torque distribution controller controls the front drive assembly and the rear drive assembly in response to the operating state detected by the sensing element.

[0013] Based on the technical solutions described above, optionally, the torque distribution controller is further configured to control the front drive assembly to stop working when the rear drive assembly is operating at a power less than or equal to the rated power of the rear drive assembly.

[0014] Based on the technical solutions described above, optionally, when the rear-drive assembly operates at a power level less than or equal to the rated power of the rear-drive assembly, the pure electric cleaning vehicle performs regenerative braking.

[0015] Thus, according to the pure electric cleaning vehicle provided in this application, when the pure electric cleaning vehicle is underpowered on a slope, the torque distribution controller can control the front drive component to start, thereby increasing the overall driving force, reducing the workload of the rear drive component, and ensuring that the rear drive component operates at a suitable temperature. By matching the axle load with the appropriate power output, the operational stability is improved.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic cross-sectional view of the hub motor used in the pure electric cleaning vehicle provided according to an embodiment of this application is shown.

[0019] Figure 2 This illustrates one driving method used in the prior art.

[0020] Figure 3 This illustrates another driving method used in the prior art.

[0021] Figure 4 A schematic diagram of the driving principle of a pure electric cleaning vehicle according to an embodiment of this application is shown.

[0022] Figure 5 A control logic flowchart of a pure electric cleaning vehicle provided according to an embodiment of this application is shown. Detailed Implementation

[0023] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0027] Prior to this application, as described in the background section, existing pure electric cleaning vehicles typically employed... Figure 2 The central drive and shown in the image Figure 3 The rear axle is driven by either of these two methods.

[0028] This is because existing pure electric cleaning vehicles are typically designed for urban applications, and the operating conditions they operate in are primarily urban road conditions. In these conditions, flat surfaces are predominantly present, with fewer and generally shorter slopes. Therefore, urban road conditions can be considered primarily level surfaces. When using these conditions as a design reference for pure electric cleaning vehicles, the design approach is basically... Figure 2 and Figure 3 As given in the text.

[0029] The mass production and application of existing pure electric cleaning vehicles have led to the coverage of common working conditions for uncommon working conditions. That is, even when dealing with sanitation and cleaning work on mountain roads with mainly slopes, pure electric cleaning vehicles designed for urban road conditions are still used.

[0030] In practical applications in this field, technicians can naturally consider changes in working conditions, which may have adverse effects on traditional pure electric cleaning vehicles designed for urban roads. However, the way pure electric cleaning vehicles operate reduces the weight that technicians place on such adverse effects.

[0031] Pure electric cleaning vehicles combine cleaning and sweeping functions. Besides carrying various linked sweeping mechanisms, they also carry cleaning fluids such as water. Combined with the sweeping mechanism, they clean the road surface. Therefore, pure electric cleaning vehicles are often quite heavy; currently, widely used pure electric cleaning vehicles typically weigh around 18 tons. Consequently, considering the time required for road cleaning and the high weight of the pure electric cleaning vehicle, its operating speed on the road is much slower than that of other passenger vehicles.

[0032] Therefore, for mountain roads with many slopes and sharp bends, the application of vehicles should prioritize safety performance. However, due to the low-speed operation of pure electric cleaning vehicles, there is less need to consider the threats posed by vehicle speed in terms of safety performance. This weakens the opportunity for technicians to explore the adverse effects of changes in operating conditions.

[0033] However, the inventors of this application have discovered that although the operating speed of the pure electric cleaning vehicle is slow, changes in operating conditions directly affect its drive. This is manifested in the fact that as the weight of the ramp increases, the axle load shifts to the rear of the vehicle, leading to an increase in the load on the rear axle, i.e., increased rear axle weight. Consequently, the power and torque requirements of the motor corresponding to the rear axle of the pure electric cleaning vehicle also increase. Since pure electric cleaning vehicles often need to travel on ramps for a longer time compared to passenger cars, the increased power and torque requirements of the motor often lead to overheating of the motor and motor controller.

[0034] In addition, the rearward shift of axle load is accompanied by a lighter front axle load, which reduces the friction between the front wheels of the pure electric cleaning vehicle and the ground, making it easy to lose directional control performance, which also brings higher safety risks on mountain roads.

[0035] In view of the above, this application is hereby submitted. An embodiment of this application provides a pure electric cleaning vehicle, which will be described below in conjunction with... Figures 1 to 5 Describe in detail the structure and working principle of the pure electric cleaning vehicle.

[0036] The pure electric cleaning vehicle provided in the embodiments of this application introduces front axle power in its power output, and at the same time, uses a reasonable power distribution method to enable the pure electric cleaning vehicle to adapt to the working conditions of frequent slopes in mountainous areas. The following will combine Figure 1 , Figure 4 as well as Figure 5 Describe the structure of the pure electric cleaning vehicle in detail.

[0037] In an embodiment, Figure 1 The diagram shows a hub motor, which is used to power the wheels of a pure electric cleaning vehicle. In this embodiment, the hub motor is an existing structure, and this type of drive structure provides customized power output to the corresponding installed wheels.

[0038] See Figure 4 , Figure 4 This diagram illustrates the simplified principle of the chassis drive structure of a pure electric cleaning vehicle. The vehicle's forward direction is from... Figure 4 The right side of the axle points to the left; therefore, the paired wheels on the left are the front axle, and the paired wheels on the right are the rear axle. Here, the front axle side is referred to as axle 1, and the rear axle side is referred to as axle 2.

[0039] In this embodiment, a set of hub motors is added to each of the two front wheels corresponding to the front axle, and an electric drive axle is used at the rear axle. Under flat road conditions, i.e., when the pure electric cleaning vehicle is driving normally on flat roads, the front axle power is not engaged, and the electric drive axle of the rear axle is used preferentially for driving operations. However, under continuous uphill conditions, when the torque required by the rear axle exceeds its rated torque, the two hub motors on axle 1 (the front axle) intervene to drive the vehicle, ensuring that the total torque of axles 1 and 2 equals the required torque, thereby reducing the torque of the motor on axle 2 and keeping the motor on axle 2 operating within a reasonable temperature range.

[0040] In the embodiments, regarding control, the pure electric cleaning vehicle provided according to the embodiments of this application has a dual hub motor on the first axle as described above, and an electric drive axle on the second axle. The electronic control of the hub motor on the first axle and the electronic control of the electric drive axle on the second axle are integrated into a multi-in-one torque distribution controller. According to the road conditions where the pure electric cleaning vehicle is located, the torque is regulated and distributed through the multi-in-one torque distribution controller. In addition, the dual hub motor on the first axle can also allow the multi-in-one torque distribution controller to adopt differentiated torque distribution strategies for the two wheels, thereby adapting to some long curves.

[0041] Based on the technical features described above, the following will describe the structure of the pure electric cleaning vehicle provided according to the embodiments of this application, with reference to... Figure 5 The specific working process is described below.

[0042] When a pure electric cleaning vehicle is running stably on a flat road, the presence of rolling friction and wind resistance leads to running resistance, resulting in the following force relationship: Ft = FW + Ff (Ft is the driving force of the pure electric cleaning vehicle, FW is the wind resistance, and Ff is the rolling resistance). In other words, the sum of the driving force, wind resistance, and friction resistance is balanced. Then, the electric drive axle of the two shafts outputs the required power to ensure the balance of vehicle force and power. This required power is significantly less than the rated power of the motor.

[0043] When driving on flat roads in rainy or snowy weather, insufficient tire traction can cause tire slippage. This is because the force (Ff) decreases, and the driving force (Ft) exceeds the sum of wind resistance and rolling resistance, leading to tire slippage. The powertrain may misinterpret this as insufficient vehicle power and continue to increase torque output, causing the motor or electronic control system to overheat. According to the pure electric cleaning vehicle provided in this application embodiment, when the rear wheel sensors (such as torque sensors, hereinafter the same) detect tire slippage, the torque distribution controller executes a torque reduction command on the rear axle and simultaneously activates the hub motors on the first axle, achieving four-wheel drive mode. This four-wheel drive solution achieves balanced traction and power by activating two motors on the first axle, which helps eliminate tire slippage and avoids overheating of the motors or electronic control systems on the second axle.

[0044] When the pure electric cleaning vehicle provided in the embodiments of this application needs to climb a slope, the sensor detects that the tire power is insufficient (the direct manifestation is that the rear axle, that is, the motor of the 2-axis is working above the rated power) or the tire slips. At this time, the torque distribution controller starts the two hub motors of the 1-axis. All three motors output as required. At this time, Ft=F11+F12+F2=FW+Ff (F11-hub motor 1 of the 1-axis, F12-hub motor 2 of the 1-axis). The vehicle reaches force balance and the vehicle climbs the slope at a stable speed.

[0045] When the pure electric cleaning vehicle provided according to the embodiments of this application is performing water spraying operations while climbing a slope, the axle load of the second axle decreases as the operation progresses. When the power torque of the second axle is sufficient to meet the vehicle's climbing needs, the torque distribution controller performs the operation of cutting off the two motors of the first axle. In addition, when going downhill or on flat roads, the hub motor of the first axle disengages, and only the drive motor of the second axle operates, saving the vehicle's electrical energy and simultaneously performing regenerative braking.

[0046] The above are merely preferred embodiments of this application and do not limit the scope of protection of this application. Any equivalent structural transformations made based on the innovative concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A pure electric cleaning vehicle, characterized in that, The pure electric cleaning vehicle includes: First front wheel and second front wheel, A front-wheel drive assembly, which is drive-connected to the first front wheel and the second front wheel, and is used to provide power to the first front wheel and the second front wheel; First rear wheel and second rear wheel A rear-drive assembly, which is drive-connected to the first rear wheel and the second rear wheel, and is used to provide power to the first rear wheel and the second rear wheel; A torque distribution controller, which is communicatively connected to the front drive assembly and the rear drive assembly. The torque distribution controller controls the rear-drive assembly to drive the first and second rear wheels, thereby driving the pure electric cleaning vehicle. The torque distribution controller is further configured to control the front drive assembly to drive the first front wheel and the second front wheel when the rear drive assembly is operating at a power greater than the rated power of the rear drive assembly, so as to jointly drive the pure electric cleaning vehicle with the first rear wheel and the second rear wheel.

2. The pure electric cleaning vehicle according to claim 1, characterized in that, The front drive assembly includes a first drive structure and a second drive structure. The first drive structure is connected to the first front wheel drive, and the second drive structure is connected to the second front wheel drive. Both the first drive structure and the second drive structure are communicatively connected to the torque distribution controller to drive the first front wheel and the second front wheel, respectively.

3. The pure electric cleaning vehicle according to claim 2, characterized in that, The first drive structure is a first hub motor, and the second drive structure is a second hub motor.

4. The pure electric cleaning vehicle according to claim 2, characterized in that, The rear drive assembly is an electric drive bridge.

5. The pure electric cleaning vehicle according to claim 1, characterized in that, The rear drive assembly is an electric drive axle, which simultaneously drives the first rear wheel and the second rear wheel.

6. The pure electric cleaning vehicle according to claim 1, characterized in that, The front drive assembly is a front drive axle, which drives both the first front wheel and the second front wheel.

7. The pure electric cleaning vehicle according to claim 6, characterized in that, The rear drive assembly is an electric drive axle, which simultaneously drives the first rear wheel and the second rear wheel.

8. The pure electric cleaning vehicle according to any one of claims 1 to 7, characterized in that, The pure electric cleaning vehicle also includes a sensing element, which is disposed on at least one of the first rear wheel and the second rear wheel, and the sensing element is used to sense the working state of the first rear wheel and the second rear wheel. The sensing element is communicatively connected to the torque distribution controller, and the torque distribution controller controls the front drive assembly and the rear drive assembly in response to the operating state detected by the sensing element.

9. The pure electric cleaning vehicle according to any one of claims 1 to 7, characterized in that, The torque distribution controller is also configured to control the front drive assembly to stop operating when the rear drive assembly is operating at a power level less than or equal to the rated power of the rear drive assembly.

10. The pure electric cleaning vehicle according to claim 9, characterized in that, When the rear-drive assembly operates at a power level less than or equal to the rated power of the rear-drive assembly, the pure electric cleaning vehicle performs regenerative braking.

Images