A power system and control method for a pure electric sanitation vehicle; sanitation vehicle

Abstract

This application discloses a power system and control method for a pure electric sanitation vehicle, as well as the sanitation vehicle itself. The power system includes: a drive motor; a normally closed clutch, one end of which is driven and connected to the output shaft of the drive motor, and the other end of which is connected to the vehicle's drive shaft; a normally open clutch, one end of which is driven and connected to the output shaft of the drive motor, and the other end of which is driven and connected to the superstructure power unit; and a control system, connected to the drive motor, the normally closed clutch, and the normally open clutch, for controlling the engagement and disengagement states of the normally closed clutch and the normally open clutch based on the vehicle's current status information and the superstructure's operating status information, and controlling the drive motor to ensure that the sanitation vehicle is currently only in superstructure operating mode or chassis operating mode via the normally closed clutch and the normally open clutch. This application uses only one motor and two mutually exclusive normally closed and normally open clutches, reducing costs, simplifying the structure, increasing transmission efficiency, and ensuring safety and reliability.

Description

Technical Field

[0001] This application relates to the field of sanitation equipment technology, and in particular, to a control method for a pure electric sanitation vehicle power system and the sanitation vehicle itself. Background Technology

[0002] Existing pure electric sanitation vehicles, such as garbage dump trucks and compactor trucks, have two power drive methods. The first method uses an electric motor to directly drive the vehicle's movement, while the superstructure motor drives the oil pump to operate the superstructure's working mechanism during superstructure operations. In other words, vehicle movement and superstructure operations are completed by two separate motors, and their operation does not interfere with each other. The second method uses a drive motor connected to a gearbox to drive the vehicle's movement, while the gearbox carries a power take-off (PTO). The PTO drives the oil pump to operate the superstructure's working mechanism, meaning that vehicle movement and superstructure operations are completed by the same motor.

[0003] However, the first type of power drive has the following drawbacks:

[0004] 1) The upper structure is driven by a separate motor and controller, which increases the cost of a separate motor and controller;

[0005] 2) The superstructure motor and controller need to draw power from the chassis battery to operate. The high-voltage power distribution of the chassis needs to be designed to draw power from the superstructure, and at the same time, the corresponding pre-charge, fuse and control circuits need to be matched, which increases the system complexity and cost.

[0006] 3) The motor and controller occupy space in the upper structure, reducing the actual load-bearing volume of the upper structure.

[0007] However, the second type of power drive has the following disadvantages:

[0008] 1) It must include a gearbox, which increases costs and limits the drive type, making it impossible to implement an electric motor;

[0009] 2) The gearbox will result in a loss of transmission efficiency;

[0010] 3) The transmission requires regular oil changes, which incurs maintenance costs. Summary of the Invention

[0011] This application provides a power system for a pure electric sanitation vehicle to solve the technical problems of complex structure, high cost, low transmission efficiency, and high maintenance cost of existing pure electric sanitation vehicles.

[0012] The technical solution adopted in this application is as follows:

[0013] A power system for a pure electric sanitation vehicle, comprising:

[0014] Drive motor;

[0015] A normally closed clutch device, one end of which is driven and connected to the output shaft of the drive motor, and the other end is connected to the vehicle drive shaft;

[0016] A normally open clutch device, one end of which is driven and connected to the output shaft of the drive motor, and the other end of which is driven and connected to the upper power device.

[0017] The control system is connected to the drive motor, normally closed clutch, and normally open clutch. It is used to control the clutch state of the normally closed clutch and normally open clutch according to the current vehicle status information and the upper structure operation status information, and to control the drive motor to ensure that the sanitation vehicle is currently only in the upper structure operation mode or the chassis operation mode through the normally closed clutch and normally open clutch.

[0018] Furthermore, the normally closed clutch device and the normally open clutch device are hydraulic clutches, electronic clutches, or manual clutches with mechanically mutually exclusive structures.

[0019] Furthermore, both the normally closed clutch and the normally open clutch employ a bushing spline that can be axially slidable to achieve connection and disconnection.

[0020] Furthermore, the superstructure power unit includes an oil pump for converting the mechanical power of the drive motor into hydraulic power.

[0021] Furthermore, the drive motor is a through-shaft motor with two output ends.

[0022] This application also provides a control method for the power system of the pure electric sanitation vehicle as described above, including the following steps:

[0023] Obtain the current vehicle status information and the superstructure operation status information;

[0024] Based on the vehicle's current status information and the superstructure operation status information, the system controls the clutch states of the normally closed clutch and normally open clutch, and controls the drive motor to ensure that the sanitation vehicle is currently only in superstructure operation mode or chassis operation mode through the normally closed clutch and normally open clutch.

[0025] Furthermore, the vehicle's current status information includes the current vehicle speed, P gear signal, and motor status signal, while the superstructure operation status information includes the power take-off signal and the superstructure working signal.

[0026] Furthermore, based on the vehicle's current status information and the superstructure's operating status information, the clutch states of the normally closed clutch and normally open clutch are controlled, and the drive motor is controlled to ensure that the sanitation vehicle is currently only in superstructure operating mode or chassis operating mode via the normally closed clutch and normally open clutch. Specific steps include:

[0027] Determine if the current vehicle speed is 0. If not, block the power take-off signal and prohibit switching between the normally closed and normally open clutch states to keep the sanitation vehicle in chassis working mode; if yes, proceed to the next step.

[0028] Determine if a P gear signal is received. If not, disable the power take-off signal and prohibit switching between normally closed and normally open clutch states. If yes, proceed to the next step.

[0029] Determine if a power take-off signal is received. If not, prohibit switching between the normally closed and normally open clutch states. If yes, switch between the normally closed and normally open clutch states, engaging the normally open clutch and disengaging the normally closed clutch, and proceed to the next step.

[0030] If a working signal for the superstructure is received, the drive motor is started to respond to the working signal and drive the superstructure power unit to enter the superstructure working mode; otherwise, the drive motor is in standby mode.

[0031] Furthermore, based on the vehicle's current status information and the superstructure's operating status information, the clutch states of the normally closed clutch and normally open clutch are controlled, and the drive motor is controlled to ensure that the sanitation vehicle is currently only in superstructure operating mode or chassis operating mode via the normally closed clutch and normally open clutch. Specific steps include:

[0032] Determine if the drive motor is working. If yes, maintain the power take-off signal and prohibit switching between the normally closed and normally open clutch states. If no, proceed to the next step.

[0033] Determine if there is an upper-mounted working signal. If yes, do not switch the normally closed clutch or normally open clutch status. If no, proceed to the next step.

[0034] Determine if there is a P gear signal. If not, prohibit switching between normally closed and normally open clutch states. If yes, proceed to the next step.

[0035] Determine if there is a power take-off signal. If there is, prohibit entering the chassis working mode. If not, switch the normally closed clutch and normally open clutch states, disengaging the normally open clutch and engaging the normally closed clutch to enter the chassis working mode.

[0036] This application also provides a sanitation vehicle, characterized in that the sanitation vehicle includes the pure electric sanitation vehicle power system as described above.

[0037] Compared with the prior art, this application has the following advantages:

[0038] This application provides a power system for a pure electric sanitation vehicle, comprising: a drive motor; a normally closed clutch device, one end of which is drivenly connected to the output shaft of the drive motor, and the other end of which is connected to the vehicle's drive shaft; a normally open clutch device, one end of which is drivenly connected to the output shaft of the drive motor, and the other end of which is drivenly connected to the superstructure power unit; and a control system, which is controlled and connected to the drive motor, the normally closed clutch device, and the normally open clutch device, for controlling the clutch states of the normally closed clutch device and the normally open clutch device according to the vehicle's current status information and the superstructure operation status information, and controlling the drive motor to ensure that the sanitation vehicle is currently only in the superstructure working mode or the chassis working mode through the normally closed clutch device and the normally open clutch device. Compared to existing technologies, this application uses only one motor and two mutually exclusive normally closed and normally open clutches, thus reducing the number of motors and controllers and lowering costs. The normally open and normally closed clutches are mutually exclusive; if one clutch engages, the other must disengage, preventing simultaneous engagement or disengagement and ensuring the vehicle does not operate while driving and does not drive while operating. This saves space in the superstructure, allowing for increased superstructure volume. It also reduces the complexity of high-voltage power distribution in the chassis, further lowering costs. Finally, this application reduces the number of high-voltage wiring harnesses from the chassis to the superstructure motor, further reducing costs. This application eliminates the risk of EMC interference and improves reliability. Simultaneously, it enables direct drive of the motor, eliminating the need to change transmission fluid, thus improving vehicle comfort and achieving maintenance-free operation. The clutch device of this application achieves 100% transmission efficiency when fully engaged, with no transmission efficiency loss. The clutch device's disengagement and engagement are completed at 0 vehicle speed, with no dynamic disengagement or engagement, and no semi-clutch state, preventing wear on the clutch friction plates and eliminating the jerking sensation during dynamic engagement. When a vehicle malfunctions and requires towing, the power take-off switch can be opened to separate the drive motor and transmission shaft, preventing back electromotive force generated during towing from damaging the IGBT.

[0039] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. The application will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0040] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0041] Figure 1 This is a schematic diagram of the power system of a pure electric sanitation vehicle according to a preferred embodiment of this application.

[0042] Figure 2 This is a schematic flowchart of the control method according to a preferred embodiment of this application.

[0043] Figure 3 This is a flowchart illustrating a sub-step of step S2 in a preferred embodiment of this application.

[0044] Figure 4 This is a flowchart illustrating a sub-step of step S2 in another preferred embodiment of this application.

[0045] In the diagram: 1. Upper structure power unit; 2. Normally open clutch device; 3. Drive motor; 4. Normally closed clutch device; 5. Vehicle drive shaft; 6. Main reducer; 7. Wheels. Detailed Implementation

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] like Figure 1 As shown, a preferred embodiment of this application provides a power system for a pure electric sanitation vehicle, including a drive motor 3, a normally closed clutch device 4, a normally open clutch device 2, and a control system.

[0048] The drive motor is a through-shaft motor with two output ends;

[0049] One end of the normally closed clutch device 4 is driven by the output shaft of the drive motor 3, and the other end is connected to the vehicle drive shaft 5. The vehicle drive shaft 5 drives the wheels 7 through the main reducer 6.

[0050] One end of the normally open clutch device 2 is driven and connected to the output shaft of the drive motor 3, and the other end is driven and connected to the upper structure power device 1. The upper structure power device 1 is an oil pump, which is a conventional vehicle oil pump, used to convert the mechanical power of the drive motor 3 into hydraulic power, and then use the hydraulic power to drive the upper structure operation, such as telescopic boom, crane boom, etc.

[0051] The control system is connected to the drive motor 3, the normally closed clutch device 4, and the normally open clutch device 2. It is used to control the clutch state of the normally closed clutch device 4 and the normally open clutch device 2 according to the current vehicle status information and the upper structure operation status information, and to control the drive motor 3 to make the sanitation vehicle currently only in the upper structure operation mode or the chassis operation mode through the normally closed clutch device 4 and the normally open clutch device 2.

[0052] This embodiment provides a pure electric sanitation vehicle power system, including a drive motor 3, a normally closed clutch device 4, a normally open clutch device 2, and a control system. The drive motor is a through-shaft motor with two output ends. One end of the normally closed clutch device 4 is driven and connected to the output shaft of the drive motor 3, and the other end is connected to the vehicle drive shaft 5. One end of the normally open clutch device 2 is driven and connected to the output shaft of the drive motor 3, and the other end is driven and connected to the superstructure power unit 1. The control system is connected to the drive motor 3, the normally closed clutch device 4, and the normally open clutch device 2, and is used to control the clutch states of the normally closed clutch device 4 and the normally open clutch device 2 according to the current vehicle status information and the superstructure operation status information, and to control the drive motor 3 to achieve vehicle driving or superstructure operation through the normally closed clutch device 4 and the normally open clutch device 2. Compared to existing technologies, this application uses only one motor and two mutually exclusive normally closed and normally open clutch devices, thus reducing one set of motors and motor controllers, lowering costs; saving space in the superstructure, which can be used to increase the superstructure volume; reducing the complexity of chassis high-voltage power distribution, further reducing costs; reducing the high-wire harness from the chassis to the superstructure motor, lowering costs, reducing the risk of EMC interference, and improving reliability; simultaneously, this application can also achieve direct drive of the motor, eliminating the need to change transmission fluid, improving vehicle comfort and achieving maintenance-free operation; the transmission efficiency of the clutch device in this application is 100% when fully engaged, with no efficiency loss from the transmission; the clutch device's disengagement and engagement are both completed at vehicle speed of 0, with no dynamic disengagement or engagement, no half-clutch state, preventing wear of the clutch friction plates, and eliminating the jerking sensation during dynamic engagement; when the vehicle needs to be towed due to a breakdown, the power take-off switch can be opened to separate the drive motor and drive shaft, preventing the back electromotive force generated during towing from damaging the IGBT.

[0053] In a preferred embodiment of this application, the normally closed clutch device and the normally open clutch device are hydraulic clutches, electronic clutches, or manual clutches with mechanical mutual exclusion structures. This embodiment uses an electronic clutch, which has a simple structure and is convenient and reliable to control.

[0054] In a preferred embodiment of this application, both the normally closed clutch and the normally open clutch employ a bushing spline that allows for axial sliding connection and disconnection, featuring a simple structure and low cost. In this embodiment, the bushing spline connects to the output shaft of the drive motor 3, the oil pump drive shaft, and the vehicle transmission shaft 5. Similarly, the bushing connections at both ends of the output shaft of the drive motor 3 are mutually exclusive; that is, when connected to the vehicle transmission shaft 5, the bushing connected to the oil pump drive shaft is disengaged; and when the bushing connected to the oil pump drive shaft is in the connected state, the bushing connected to the vehicle transmission shaft 5 is in the disengaged state.

[0055] like Figure 2As shown, another preferred embodiment of this application also provides a control method for the power system of the pure electric sanitation vehicle as described above, including the following steps:

[0056] S1. Obtain the current vehicle status information and the upper structure operation status information;

[0057] S2. Based on the current vehicle status information and the upper structure operation status information, control the clutch status of the normally closed clutch and normally open clutch, and control the drive motor to ensure that the sanitation vehicle is currently only in the upper structure working mode or the chassis working mode through the normally closed clutch and normally open clutch.

[0058] In this embodiment, the normally open clutch and the normally closed clutch are mutually exclusive, meaning that if one clutch device engages, the other clutch device will necessarily disengage. There will be no situation where both clutch devices engage or disengage simultaneously, ensuring that the vehicle does not operate while driving and does not drive while operating, thus guaranteeing the safety and reliability of the single-motor driven sanitation vehicle.

[0059] The vehicle's current status information includes the current vehicle speed, P gear signal, and motor status signal, while the superstructure operation status information includes the power take-off signal and superstructure operation signal.

[0060] like Figure 3 As shown, in a preferred embodiment of this application, the clutch states of the normally closed clutch and normally open clutch are controlled according to the vehicle's current status information and the superstructure operation status information. The drive motor is also controlled to ensure that the sanitation vehicle is currently only in superstructure operation mode or chassis operation mode via the normally closed clutch and normally open clutch. Specifically, the steps include:

[0061] S201. Determine if the current vehicle speed is 0. If not, block the power take-off signal and prohibit switching between the normally closed clutch and the normally open clutch, so that the sanitation vehicle maintains the chassis working mode; if yes, proceed to step S202.

[0062] S202. Determine whether a P gear signal has been received. If not, block the power take-off signal and prohibit switching between the normally closed clutch and normally open clutch states. If yes, proceed to step S203.

[0063] S203. Determine whether a power take-off signal has been received. If not, prohibit switching between the normally closed clutch and the normally open clutch. If yes, switch between the normally closed clutch and the normally open clutch, so that the normally open clutch is engaged and the normally closed clutch is disengaged, and proceed to step S204.

[0064] S204. If a working signal for the superstructure is received, the drive motor is started to respond to the working signal and drive the superstructure power unit to enter the superstructure working mode; otherwise, the drive motor is in standby mode.

[0065] This embodiment provides the process for the power system of the aforementioned pure electric sanitation vehicle to enter the superstructure working mode. In this embodiment, to prevent interference between the superstructure working mode and the chassis working mode, before entering the superstructure working mode, preset conditions must be met for the current vehicle speed, P gear signal, power take-off signal, and superstructure working signal to proceed from the chassis working mode to the superstructure working mode. For example, if the current vehicle speed is 0, a P gear signal is present, a power take-off signal is present, and a superstructure working signal is present, the drive motor will be activated to respond to the working signal and drive the superstructure power unit to enter the superstructure working mode. If any one of these conditions is missing... Neither vehicle will enter the superstructure working mode; instead, it will maintain the existing working mode. In order to carry out superstructure operations, the vehicle must be parked and in a parking state, with a power take-off signal and a superstructure working signal. At this time, the vehicle is in a stationary and stable state, and the power take-off signal and superstructure working signal indicate a clear superstructure operation requirement. Activating the superstructure working mode at this time can effectively prevent safety issues caused by incorrect operation and ensure that the sanitation vehicle is only in one working mode at any given time. That is, the current working mode is either the superstructure working mode or the chassis working mode, so that the drive motor 3 will only provide power to the superstructure power unit at the current time to drive the superstructure operation.

[0066] like Figure 4 As shown, in a preferred embodiment of this application, the clutch states of the normally closed clutch and normally open clutch are controlled according to the vehicle's current status information and the superstructure operation status information. The drive motor is also controlled to ensure that the sanitation vehicle is currently only in superstructure operation mode or chassis operation mode via the normally closed clutch and normally open clutch. Specifically, the steps include:

[0067] S211. Determine if the drive motor is working. If yes, maintain the power take-off signal and prohibit switching the normally closed clutch device 4 and normally open clutch device 2. If no, proceed to S212.

[0068] S212. Determine if there is an upper-mounted working signal. If yes, prohibit switching the state of normally closed clutch device 4 and normally open clutch device 2. If no, proceed to S213.

[0069] S213. Determine if there is a P gear signal. If not, prohibit switching of the normally closed clutch device. 4. Normally open clutch device 2 state. If yes, proceed to S214.

[0070] S214. Determine if there is a power take-off signal. If there is, prohibit entering the chassis working mode. If not, switch the state of normally closed clutch device 4 and normally open clutch device 2, so that normally open clutch device 2 is disengaged and normally closed clutch device 4 is engaged, and enter the chassis working mode.

[0071] This embodiment provides the process for the power system of the aforementioned pure electric sanitation vehicle to enter the chassis working mode. In this embodiment, to prevent interference between the superstructure working mode and the chassis working mode, before entering the chassis working mode, the motor working signal, superstructure working signal, P gear signal, and power take-off signal must all meet preset conditions before the transition from the superstructure working mode to the chassis working mode can occur. For example, when the motor working signal, superstructure working signal, P gear signal, and power take-off signal are all satisfied, the normally closed clutch and normally open clutch will be switched, causing the normally open clutch to disengage and the normally closed clutch to engage (in the superstructure working mode, the normally open clutch engages and the normally closed clutch disengages), thus entering the chassis working mode. If any one of these conditions is missing, the vehicle will not enter the chassis working mode and will instead maintain the existing working mode. For the chassis to work (vehicle movement), the motor must not be working, there must be no superstructure working signal, there must be a P gear signal, and there must be no power take-off signal. At this time, the vehicle is in a stationary and stable state, the motor is off, and there is no clear superstructure operation requirement such as a power take-off signal or a superstructure working signal. Only by activating the chassis working mode at this time can the safety problem of erroneous operation be effectively prevented. This ensures that the sanitation vehicle is only in one working mode at any given time, that is, the current working mode is either the superstructure working mode or the chassis working mode. As a result, the drive motor 3 will only provide power to the vehicle's drive shaft 5 at the current time to drive the vehicle.

[0072] Another embodiment of this application also provides a sanitation vehicle, which includes the pure electric sanitation vehicle power system described above. The sanitation vehicle includes pure electric road sweepers, washing and sweeping vehicles, cleaning vehicles, multi-functional dust suppression vehicles, hedge trimmers, garbage dump trucks, and garbage compactors, etc., for urban road cleaning vehicles.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power system for a pure electric sanitation vehicle, characterized in that, include: The drive motor is a through-shaft motor with two output ends; A normally closed clutch device, one end of which is driven and connected to the output shaft of the drive motor, and the other end is connected to the vehicle drive shaft; A normally open clutch device, one end of which is driven and connected to the output shaft of the drive motor, and the other end of which is driven and connected to the upper power device. The control system is connected to the drive motor, normally closed clutch, and normally open clutch. It is used to mutually exclusively control the engagement and disengagement states of the normally closed clutch and normally open clutch based on the current vehicle status information and the superstructure operation status information. It also controls the drive motor to ensure that the sanitation vehicle is currently only in the superstructure operation mode or the chassis operation mode through the normally closed clutch and normally open clutch. The disengagement and engagement of the normally closed clutch and normally open clutch are both completed when the vehicle speed is 0.

2. The power system for a pure electric sanitation vehicle according to claim 1, characterized in that, The normally closed clutch device and normally open clutch device adopt a hydraulic clutch, an electronic clutch, or a manual clutch with a mechanical mutual exclusion structure.

3. The power system for a pure electric sanitation vehicle according to claim 1, characterized in that, Both the normally closed clutch and the normally open clutch employ a bushing spline that allows for axial sliding to connect and disconnect.

4. The power system for a pure electric sanitation vehicle according to claim 1, characterized in that, The superstructure power unit includes an oil pump, which converts the mechanical power of the drive motor into hydraulic power.

5. A control method for the power system of a pure electric sanitation vehicle as described in any one of claims 1 to 4, characterized in that, Including the following steps: Obtain the current vehicle status information and the superstructure operation status information; Based on the vehicle's current status information and the superstructure operation status information, the normally closed clutch and normally open clutch are mutually exclusively controlled, and the drive motor is controlled to ensure that the sanitation vehicle is currently only in the superstructure operation mode or the chassis operation mode through the normally closed clutch and normally open clutch. The separation and engagement of the normally closed clutch and normally open clutch are both completed when the vehicle speed is 0.

6. The control method according to claim 5, characterized in that, The vehicle's current status information includes the current vehicle speed, P gear signal, and motor status signal; the superstructure operation status information includes the power take-off signal and superstructure operation signal.

7. The control method according to claim 6, characterized in that, Based on the vehicle's current status information and the superstructure's operating status information, the system controls the engagement / disengagement states of the normally closed and normally open clutches, and controls the drive motor to ensure that the sanitation vehicle is currently only in superstructure operating mode or chassis operating mode via the normally closed and normally open clutches. Specific steps include: Determine if the current vehicle speed is 0. If not, block the power take-off signal and prohibit switching between normally closed and normally open clutch states, so that the sanitation vehicle maintains the chassis working mode. If so, proceed to the next step; Determine if a P gear signal is received. If not, disable the power take-off signal and prohibit switching between normally closed and normally open clutch states. If so, proceed to the next step; Determine if a power take-off signal is received. If not, prohibit switching between the normally closed and normally open clutch states. If yes, switch between the normally closed and normally open clutch states, engaging the normally open clutch and disengaging the normally closed clutch, and proceed to the next step. If a working signal for the superstructure is received, the drive motor is started to respond to the working signal and drive the superstructure power unit to enter the superstructure working mode; otherwise, the drive motor is in standby mode.

8. The control method according to claim 6, characterized in that, Based on the vehicle's current status information and the superstructure's operating status information, the system controls the engagement / disengagement states of the normally closed and normally open clutches, and controls the drive motor to ensure that the sanitation vehicle is currently only in superstructure operating mode or chassis operating mode via the normally closed and normally open clutches. Specific steps include: Determine if the drive motor is working. If yes, maintain the power take-off signal and prohibit switching between the normally closed and normally open clutch states. If no, proceed to the next step. Determine if there is an upper-mounted working signal. If yes, do not switch the normally closed clutch or normally open clutch status. If no, proceed to the next step. Determine if there is a P gear signal. If not, prohibit switching between normally closed and normally open clutch states. If yes, proceed to the next step. Determine if there is a power take-off signal. If there is, prohibit entering the chassis working mode. If not, switch the normally closed clutch and normally open clutch states, disengaging the normally open clutch and engaging the normally closed clutch to enter the chassis working mode.

9. A sanitation vehicle, characterized in that, The sanitation vehicle includes a pure electric sanitation vehicle power system as described in any one of claims 1 to 4.

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