Electric vehicle and electrified power system thereof

Abstract

An electrified power system (3) for an electric vehicle comprises a travel unit (31) for driving the electric vehicle to move forward and backward and an operation unit (32) for performing various operations, wherein the travel unit (31) comprises a first motor (311), a power transmission mechanism (312), a differential (313) and a driving wheel (314), and the operation unit (32) comprises a second motor (321), an operation drive system (322) and an operation device (323), and further comprises a power combining device for combining the output power of the first motor (311) and the second motor (321) and providing the combined output power to the power transmission mechanism (312); and a switch device (33) respectively connected to the power output end of the second motor (321), the input end of the power combining device and the input end of the operation drive system (322). In the driving mode, the switch device (33) is in the first working state so that the output power of the second motor (321) is transmitted only to the power combination device through the switch device (33), so that the output power from the first motor (311) and the second motor (321) is combined through the power combination device and then output to the differential (313). In the working mode, the switch device (33) is in the second working state so that the output power of the second motor (321) is transmitted only to the working drive system (322).

Description

Technical Field

[0001] The present invention relates to an electric vehicle and a power system included therein, and more particularly to an electric vehicle such as a street sweeper and an electrified power system included therein. Background Art

[0002] A street sweeper is a municipal vehicle used to clean streets. The power system of a street sweeper includes a travel unit and an operating unit. The travel unit is used to push the vehicle forward and backward by driving wheels, while the operating unit is used to clean streets through cleaning equipment including exhaust fans, brushes, etc. Accordingly, a street sweeper has two basic operating modes: travel mode and operating mode. In the travel mode, the street sweeper drives like other vehicles on the street without cleaning the street, and the operating unit is in an inoperative state; in the operating mode, the street sweeper drives at a low speed and cleans the street, and the operating unit is in an operating state.

[0003] Figure 1 The structure layout of a conventional fuel power system 1 of a street sweeper in the prior art is shown. Figure 1 As shown, the conventional fuel power system 1 of the street sweeper in the prior art includes a travel unit 11 and an operation unit 12. The travel unit 11 includes a chassis engine 111; a clutch 112, one end of which is connected to the power output end of the chassis engine 111; a power transmission mechanism 113 with a speed change function, Figure 1 In the example shown, for simplicity and clarity of the illustration, the power transmission mechanism 113 is shown to be composed of a group of gear pairs (depending on the specific application, one or more groups of gear pairs can be selected, and the transmission ratio of each group of gear pairs can be set accordingly as needed), the group of gear pairs includes an input end 1131 connected to the other end of the clutch 112, a first gear 1133 connected to the input end 1131, a second gear 1134 meshing with the first gear 1133, and an output end 1132 connected to the second gear 1134, wherein the gear ratio of the first gear 1133 to the second gear 1134 is set according to the required transmission ratio; a differential 114, whose input end is connected to the output end 1132 of the power transmission mechanism 113; and a drive wheel 115, which is connected to the output end of the differential 114. The working unit 12 includes an auxiliary engine 121; a clutch 122, one end of which is connected to the power output end of the auxiliary engine 121; an operating drive system (hydraulic system) 123, an input end of which is connected to the other end of the clutch 122; and a cleaning device 124, which is connected to the output end of the operating drive system (hydraulic system) 123. The cleaning device 124 includes an exhaust fan 1241, a brush 1242 and other devices, which are driven by the output power of the operating drive system (hydraulic system) 123 to perform street cleaning operations.

[0004] In the driving mode, the clutch 112 connected to the chassis engine 111 and the power transmission mechanism 113 is in a coupled state, so as to transmit the power outputted by the chassis engine 111 to the power transmission mechanism 113, and then transmit the power to the driving wheels 115 through the power transmission mechanism 113 (speed change processing) and the differential 114 connected to the power transmission mechanism 113 (speed reduction and differential processing), so that the driving wheels 115 are driven, and the street sweeper is in a driving state. At the same time, in the driving mode, the clutch 122 in the working unit 12 is in a disengaged state, so that the power generated by the auxiliary engine 121 cannot be transmitted to the working drive system (hydraulic system) 123 through the clutch 122, and then the cleaning equipment 124 connected to the working drive system (hydraulic system) 123 is not driven to work.

[0005] In the operation mode, the clutches 112 and 122 are both in the engaged state, so that the power output by the chassis engine 111 is transmitted to the driving wheels 115, so that the street sweeper is in the driving state. At the same time, the power output by the auxiliary engine 121 is also transmitted to the cleaning device 124, so that the cleaning device 124 is driven, and the exhaust fan 1241, brush 1242 and other devices included in the cleaning device 124 are in the operating state to clean the street.

[0006] Due to the growing demand for environmental protection and energy conservation, electrified powertrains for street sweepers are becoming more and more popular in the market.

[0007] Figure 2 The structure layout of the electrified power system 2 of the street sweeper in the prior art is shown. Figure 2 The electrified powertrain 2 shown is Figure 1 The structural differences of the conventional fuel power system 1 shown are: (1) the chassis engine 111 included in the travel unit 11 in the conventional power system 1 is replaced by the first motor 211 included in the travel unit 21 in the electrified power system 2; the auxiliary engine 121 included in the working unit 12 in the conventional power system 1 is replaced by the second motor 221 included in the working unit 22 in the electrified power system 2; (2) in the electrified power system 2, the clutches 112 and 122 in the conventional power system 1 are not included, and the power output end of the first motor 211 is directly connected to the power transmission mechanism 113, and the power output end of the second motor 221 is directly connected to the working drive system (hydraulic system) 123.

[0008] Figure 2 The electrified powertrain 2 shown is Figure 1The working principle of the conventional fuel power system 1 shown is basically similar, and the power requirements of the electric motor are different when the street sweeper is in different operating modes. Figures 3 (a) and (b) respectively show the driving mode and the working mode of the electrified power system 2.

[0009] As shown in Fig. 3(a), in the driving mode, the street sweeper is in a driving state. The motor 211 in the driving unit 21 needs to output high power to drive the street sweeper, while the motor 221 in the operating unit 22 does not need to output power.

[0010] As shown in FIG3(b), in the operation mode, the street sweeper travels at a low speed and the operation unit 12 is in operation to clean the street through the cleaning device 124. Therefore, the motor 211 in the travel unit 21 only needs to provide relatively low power (compared with the output power of the motor 211 in the driving mode shown in FIG3(a)), while the motor 221 in the operation unit 22 must provide sufficient power to keep the exhaust fan 1241, brush 1242 and other devices included in the cleaning device 124 in the operation state to clean the street.

[0011] It can be seen that in Figure 2 In the prior art electrified power system 2 shown, in the driving mode, the motor 221 in the working unit 22 does not need to output power, so its working capacity is completely wasted; and in the working mode, the motor 211 in the driving unit 21 only needs to output relatively low power, so it cannot work efficiently. In other words, the prior art electrified power system cannot effectively use the output power of each motor when the street sweeper is in different operating modes. Figure 2 The structure of the electrified power system 2 shown in the figure is irrational, and there is room for significant optimization and improvement in many aspects, such as improving the efficiency of the use of the electric motor, simplifying the structure of the electrified power system, and reducing the cost of the electrified power system. Summary of the invention

[0012] The object of the present invention is to provide an electric vehicle and an electrified power system included therein, which can effectively improve the use efficiency of the electric motor in the electrified power system, simplify the structure of the electrified power system, and reduce the cost of the electrified power system.

[0013] According to a first aspect of the present invention, there is provided an electrified power system for an electric vehicle, the electrified power system comprising a travel unit for driving the electric vehicle to move forward and backward and a work unit for performing various operations, the travel unit comprising a first motor; a power transmission mechanism, an input end of which is connected to a power output end of the first motor; a differential, an input end of which is connected to an output end of the power transmission mechanism; and a drive wheel connected to an output end of the differential for driving the electric vehicle to move forward and backward, the work unit comprising a second motor; a work drive system, an input end of which is connected to a power output end of the second motor; and a work device connected to an output end of the work drive system for performing various operations, characterized in that:

[0014] The electrified power system further includes a power combining device for combining the output power of the first motor and the second motor and providing the combined output power to the power transmission mechanism; and

[0015] The switch device is respectively connected to the power output end of the second motor, the input end of the power combination device and the input end of the operation drive system,

[0016] Wherein, in the driving mode, the switch device is in the first working state so that the output power of the second motor is transmitted only to the power combination device through the switch device but not to the working drive system, so that the output power from the first motor and the second motor is combined through the power combination device, and then the combined power is output to the power transmission mechanism,

[0017] Wherein, in the operation mode, the output power of the first motor is transmitted to the power combination device, and the switch device is in the second working state so that the output power of the second motor is only transmitted to the operation drive system but not to the power combination device.

[0018] In a preferred embodiment, the power combining device is a torque coupling device, wherein in the driving mode, the switching device is in a first working state so that the output power of the second motor is transmitted to the torque coupling device, so that the torque from the output power of the first motor and the second motor is coupled through the torque coupling device and then output to the power transmission mechanism.

[0019] In a preferred embodiment, the torque coupling device is composed of a first input shaft, a first group of gear pairs, a second input shaft, a second group of gear pairs and an output shaft, wherein the first group of gear pairs is composed of a first gear and a second gear that are meshed with each other; the second group of gear pairs is composed of a second gear and a third gear that are meshed with each other; one end of the first input shaft is connected to the power output end of the first motor as the first torque input end of the torque coupling device, and the other end is connected to the first gear; one end of the second input shaft is connected to the power output end of the second motor as the second torque input end of the torque coupling device, and the other end is connected to the third gear; and one end of the output shaft is connected to the second gear, and the other end is connected to the input end of the power transmission mechanism as a coupling torque output end, wherein the mathematical relationship between the two input torques transmitted by the first torque input end and the second torque input end and the output torque transmitted by the coupling torque output end is determined by the transmission ratio of the first group of gear pairs and the transmission ratio of the second group of gear pairs.

[0020] In a preferred embodiment, the torque coupling device and the power transmission mechanism are integrated into one body, and a common output end of the torque coupling device and the power transmission mechanism is connected to an input end of the differential.

[0021] In a preferred embodiment, the switching device includes a first clutch and a second clutch, the second motor is connected to the power combination device through the first clutch, and is connected to the working drive system through the second clutch, wherein in the driving mode, the switching device is in a first working state, the first clutch is engaged and the second clutch is disengaged, so that the output power of the second motor is only transmitted to the power combination device but not to the working drive system, wherein in the working mode, the switching device is in a second working state, the first clutch is disengaged and the second clutch is engaged, so that the output power of the second motor is only transmitted to the working drive system but not to the power combination device.

[0022] In a preferred embodiment, the electrified power system also includes a control unit connected to the switching device, wherein, in driving mode, the control unit puts the switching device in a first working state; in working mode, the control unit puts the switching device in a second working state.

[0023] In a preferred embodiment, the second clutch is a bevel gear clutch capable of changing the rotation direction.

[0024] In a preferred embodiment, the first motor and the second motor are arranged non-coaxially.

[0025] In a preferred embodiment, the electric vehicle is a street sweeper, the operating drive system is a hydraulic system, and the operating equipment is a cleaning equipment including devices such as an exhaust fan and a brush.

[0026] According to a second aspect of the present invention, there is provided an electrified power system for an electric vehicle, the electrified power system comprising a travel unit for driving the electric vehicle forward and backward and an operating unit for performing various operations, the travel unit comprising a first electric motor; a power transmission mechanism, an input end of which is connected to a power output end of the first electric motor; a differential, an input end of which is connected to an output end of the power transmission mechanism; and a drive wheel, which is connected to an output end of the differential and is used to drive the electric vehicle forward and backward, the operating unit comprising a second electric motor; an operating drive system, an input end of which is connected to an output end of the power transmission mechanism; and a drive wheel. connected to the power output end of the second motor; and an operating device, which is connected to the output end of the operating drive system and is used to perform various operations, characterized in that: the electrified power system also includes a power combination device, which is used to combine the output power of the first motor and the second motor and provide it to the power transmission mechanism, wherein the power combination device is a torque coupling device, which consists of a first input shaft, a first group of gear pairs, a second input shaft, a second group of gear pairs and an output shaft, wherein the first group of gear pairs consists of a first gear and a second gear that are meshed with each other, and the second group of gear pairs consists of a first gear and a second gear that are meshed with each other. The first input shaft is composed of the second gear and the third gear, one end of the first input shaft is connected to the power output end of the first motor as the first torque input end of the torque coupling device, and the other end is connected to the first gear, one end of the second input shaft is connected to the power output end of the second motor as the second torque input end of the torque coupling device, and the other end is connected to the third gear, one end of the output shaft is connected to the second gear, and the other end is connected to the input end of the power transmission mechanism as the coupling torque output end; and a switch device is respectively connected to the power output end of the second motor, the input end of the power combination device and the input end of the working drive system, wherein in the driving mode, the switch device is in a first working state so that the output power of the second motor is transmitted only to the power combination device through the switch device but not to the working drive system, so that the output power from the first motor and the second motor is combined through the power combination device, and then the combined power is output to the power transmission mechanism, wherein in the working mode, the switch device is in a second working state so that the output power of the second motor is transmitted only to the working drive system but not to the power combination device.

[0027] According to a third aspect of the present invention, there is provided an electric vehicle comprising the above-mentioned electrified power system.

[0028] According to the electric vehicle and the electrified power system included therein of the present invention, when the electric vehicle is a street sweeper, the operation drive device is a hydraulic system, and the operation device is a cleaning device including devices such as an exhaust fan and a brush. In the driving mode, the street sweeper travels like other vehicles on the street, and the switch device is in the first working state so that the output power of the second motor is transmitted only to the power combination device (torque coupling device) through the switch device but not to the hydraulic system (operation drive system), so that the output power (torque) from the first motor and the second motor is combined (combined) through the power combination device (torque coupling device), and then the combined power (combined torque) is output to the differential, so that the driving wheels of the street sweeper are driven by the combined output power (combined torque), so that the street sweeper can move forward and backward at a higher speed.

[0029] In the operation mode, the street sweeper travels at a low speed while sweeping the streets. The switch device is in the second working state so that the output power of the second motor is transmitted only to the hydraulic system (operation drive system) but not to the power combination device (torque coupling device), and the output power of the second motor is provided to the cleaning device (operation device) through the hydraulic system (operation drive system), thereby driving the cleaning device (operation device) to operate to clean the streets. At the same time, the output power of the first motor is provided to the drive wheel alone through the power transmission mechanism. Thereby driving the street sweeper to move forward and backward at a low speed.

[0030] Obviously, the electric vehicle and the electrified power system included therein according to the present invention solve the defect of inefficient use of electric motors in the electrified power systems of electric vehicles in the prior art, effectively improve the use efficiency of electric motors in the electrified power systems, and can use smaller electric motors as the first motor, thereby reducing the cost of the electrified power system and saving space.

[0031] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The figure is a schematic diagram of the structure of a conventional fuel power system of a street sweeper in the prior art.

[0033] Figure 2 The figure is a schematic diagram of the structure of the electrified power system of the street sweeper in the prior art.

[0034] Figure 3(a) shows Figure 2 Schematic diagram of the driving mode of the electrified powertrain shown.

[0035] Figure 3(b) shows Figure 2 Schematic diagram of the operating mode of the electrified power system shown.

[0036] Figure 4 The figure is a schematic structural diagram of an electrified power system for a street sweeper according to an embodiment of the present invention.

[0037] Figure 5(a) shows Figure 4 Schematic diagram of the driving mode of the electrified powertrain shown.

[0038] Figure 5(b) shows Figure 4 Schematic diagram of the operating mode of the electrified power system shown.

[0039] Reference numerals:

[0040] 1: Conventional fuel power system of street sweeper in the prior art

[0041] 2: Electrified power system of street sweeper in the prior art

[0042] 3: The electrified power system of the street sweeper of the present invention

[0043] 11, 21, 31: Travel unit

[0044] 12, 22, 32: Operation unit

[0045] 33: Switchgear

[0046] 111: Chassis Engine

[0047] 112, 122, 331, 332: Clutch

[0048] 113: Power transmission mechanism

[0049] 312: Power transmission mechanism (torque coupling device)

[0050] 114, 313: Differential

[0051] 115, 314: driving wheels

[0052] 121: Auxiliary engine

[0053] 123, 322: Operation drive system

[0054] 124, 323: Cleaning equipment

[0055] 1241, 3231: exhaust fan

[0056] 1242, 3232: Brush

[0057] 211, 311: First motor

[0058] 221, 321: Second motor

[0059] 333: Bevel gear DETAILED DESCRIPTION

[0060] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. In other words, the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0061] The term "connection" used in the entire specification of this application (including the claims) may refer to any direct or indirect means of connection. For example, if the text describes that a first device is connected to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be indirectly connected to the second device through other devices or some means of connection. The terms "first", "second", etc. mentioned in the specification and claims of this application are used to name the names of the devices, or to distinguish different embodiments or scopes, or to facilitate the corresponding elements of the specification and claims, and are not used to limit the upper or lower limits of the number of devices, nor to limit the order of the devices. In addition, wherever possible, the elements / components / steps with the same numbers in the drawings and specific embodiments represent the same or similar parts. Elements / components / steps using the same numbers or the same terms in different embodiments can refer to the relevant descriptions with each other.

[0062] Figure 4 An electrified power system 3 for a street sweeper according to a non-limiting embodiment of the present invention is shown. In this embodiment, the electric vehicle is a street sweeper. The electrified power system 3 includes a travel unit 31 for driving the street sweeper forward and backward, an operation unit 32 for cleaning streets, and a switch device 33.

[0063] The travel unit 31 includes a first motor 311; a power transmission mechanism 312, one input end of which is connected to the power output end of the first motor 311, and the other input end of which is connected to the power output end of the second motor 321 through the switch device 33; a differential 313, an input end of which is connected to the output end of the power transmission mechanism 312; and a driving wheel 314, which is connected to the output end of the differential 313, and is used to drive the street sweeper to travel.

[0064] The operating unit 32 includes a second motor 321; a hydraulic system 322 as an operating drive system, whose input end is connected to the power output end of the second motor 321 through the switch device 33; and a cleaning device 323 for cleaning streets as an operating device, which is connected to the output end of the hydraulic system 322 and includes an exhaust fan 3231 and a brush 3232.

[0065] The first motor 311 and the second motor 321 are non-coaxially arranged.

[0066] The switch device 33 includes a first clutch 331 and a second clutch (332, 333), wherein the power output end of the second motor 321 is connected to the other input end of the power transmission mechanism 312 through the first clutch 331; the second clutch (332, 333) is a bevel gear clutch that can change the rotation direction (as shown in the figure, it is composed of a clutch 332 and a bevel gear 333 connected), and the power output end of the second motor 321 is connected to the input end of the hydraulic system 322 through the bevel gear clutch (332, 333). Of course, those skilled in the art can understand that according to different application situations, the switch device 33 can adopt other suitable forms or structures.

[0067] The power transmission mechanism 312 is a torque coupling device (i.e., the power transmission mechanism and the torque coupling device are integrated) and as a power combination device, it can simultaneously realize the speed change function of the traditional power transmission mechanism and the power combination function of the power combination device of the present invention. The torque coupling device 312 includes a first input shaft 3121, a first group of gear pairs (3123, 3124), a second input shaft 3122, a second group of gear pairs (3124, 3125) and an output shaft 3126. The first group of gear pairs is composed of a first gear 3123 and a second gear 3124 that mesh with each other. The second group of gear pairs is composed of a second gear 3124 and a third gear 3125 that mesh with each other. One end of the first input shaft 3121 is connected to the power output end of the first motor 311 as the first torque input end of the torque coupling device, and the other end is connected to the first gear 3123. One end of the second input shaft 3122 is connected to the power output end of the second motor 321 as the second torque input end of the torque coupling device, and the other end is connected to the third gear 3125. One end of the output shaft 3126 is connected to the second gear 3124, and the other end is connected to the input end of the differential 313 as a coupling torque output end. The input torque of the first motor 311 from the first torque input end and the input torque of the second motor 321 from the second torque input end are coupled through the first group of gear pairs and the second group of gear pairs, and the coupled torque is output to the differential 313. The transmission ratio of the first group of gear pairs and the transmission ratio of the second group of gear pairs can be set according to specific application conditions, and the mathematical relationship between the two input torques transmitted by the first torque input end and the second torque input end and the output torque transmitted by the coupling torque output end is determined by the transmission ratio of the first group of gear pairs and the transmission ratio of the second group of gear pairs.

[0068] exist Figure 4 In the embodiment shown, the power combination device of the present invention is a torque coupling device 312, and the torque coupling device 312 also realizes the speed change function of the conventional power transmission mechanism. However, this embodiment is non-restrictive, and the power combination device of the present invention can adopt any other suitable form of structure and configuration to realize the combination of the output power of the first motor and the output power of the second motor to be directly or indirectly transmitted to the differential through the power transmission mechanism, for example, it can be realized in the form of a speed coupling device, a torque and speed mixed coupling device, etc. Of course, according to the needs of the space setting, the power combination device of the present invention can be set separately from the power transmission mechanism and connected to each other.

[0069] exist Figure 4In the embodiment shown, the torque coupling device 312 includes two sets of gear pairs connected to each other. However, this embodiment is not limiting, and the torque coupling device suitable for use as the power combination device of the present invention may include multiple sets of gear pairs connected to each other according to specific application conditions, so as to achieve coupling of the input torque of the first motor from the first torque input end and the input torque of the second motor from the second torque input end, and then output to the differential.

[0070] exist Figure 4 In the illustrated embodiment, the torque coupling device 312 is implemented by means of gear coupling. However, this embodiment is non-restrictive, and the torque coupling device suitable for use as the power combination device of the present invention can be implemented by various means such as magnetic field coupling, chain or belt coupling, etc.

[0071] According to another preferred embodiment of the present invention (not shown), the other preferred embodiment is Figure 4 The difference between the illustrated embodiments is that the electrified power system 3 further includes a control unit connected to the switch device 33, wherein in the driving mode, the control unit puts the switch device 33 in the first working state (i.e., the first clutch 331 is in the engaged state, and the second clutch (332, 333) is in the disengaged state); in the working mode, the control unit puts the switch device 33 in the second working state (i.e., the first clutch 331 is in the disengaged state, and the second clutch (332, 333) is in the engaged state). It is obvious that those skilled in the art can easily think of various applicable structures and configurations for implementing the control unit, which will not be elaborated here.

[0072] Figure 5(a) illustrates Figure 4 The driving mode of the electrified power system 3 of the illustrated embodiment. In the driving mode, the switch device 33 is in the first working state, that is, the first clutch 331 is in the engaged state, and the second clutch (332, 333) is in the disengaged state, so that the output power of the second motor 321 is transmitted to the torque coupling device (power combining device) 312 through the first clutch 331, so that the torque from the output power of the first motor 311 and the second motor 321 is coupled through the torque coupling device 312, and then the combined power after the torque coupling is output to the differential 313, and then provided to the drive wheels 314, so that in the driving mode, since the drive wheels 314 are provided with the combined power after the torque coupling, the street sweeper can move forward and backward at a higher speed.

[0073] Figure 5(b) illustrates Figure 4The operation mode of the electrified power system 3 of the illustrated embodiment. In the operation mode, the switch device 33 is in the second working state, that is, the first clutch 331 is in the disengaged state, and the second clutch (332, 333) is in the engaged state, so that the output power of the second motor 321 cannot be transmitted to the torque coupling device (power combination device) 312 through the first clutch 331, but is provided to the hydraulic system 322 through the second clutch (332, 333), and then the brush 3231 and the fan 3232 in the cleaning device 323 are driven by the hydraulic system 322 to clean the streets. In this way, in the operation mode, only the output power of the first motor 311 is transmitted to the torque coupling device 312, and then provided to the driving wheel 314, so that the street sweeper travels at a lower speed than in the driving mode. At the same time, the output power of the second motor 321 is provided to the hydraulic system 322, thereby driving the brush 3231 and the fan 3232 in the cleaning device 323 to clean the streets.

[0074] According to another embodiment of the present invention (not shown), a street sweeper is provided, which includes the above-mentioned electrified power system 3.

[0075] and Figure 2 Compared with the prior art electrified power system 2 shown in FIG. 1 , in the electrified power system 3 according to the present invention, the designed maximum power of the first motor 311 can be much lower. Therefore, a smaller motor can be used as the first motor 311, thereby reducing costs and saving space. In addition, due to the adoption of appropriate design and energy management strategies, Figure 4 The layout shown can achieve higher energy efficiency.

[0076] Obviously, the electric vehicle according to the present invention and the electrified power system it includes solve the defect of inefficient use of electric motors in the electrified power systems of the prior art, and effectively improve the use efficiency of electric motors in the electrified power systems; a smaller electric motor can be used as the first motor, thereby reducing the cost of the electrified power system and saving installation space.

[0077] The above-mentioned embodiments are described for street sweepers. Obviously, the technical solution of the present invention is not limited to street sweepers, but can be applied to other types of electric vehicles including a traveling unit and an operating unit, including but not limited to various municipal vehicles or construction vehicles.

[0078] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0079] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An electrified power system for an electric vehicle, the electrified power system comprising a travel unit for driving the electric vehicle to move forward and backward and an operation unit for performing various operations, the travel unit comprising a first electric motor; a power transmission mechanism, whose input end is connected to the power output end of the first motor; a differential, whose input end is connected to the output end of the power transmission mechanism; and a driving wheel, which is connected to the output end of the differential and is used to drive the electric vehicle to move forward and backward, and the working unit includes a second motor; A working drive system, whose input end is connected to the power output end of the second motor; and a working device, which is connected to the output end of the working drive system and is used to perform various operations, characterized in that: The electrified power system further includes a power combining device for combining the output power of the first motor and the second motor and providing the combined output power to the power transmission mechanism; and a switch device, connected to the power output terminal of the second motor, the input terminal of the power combination device and the input terminal of the operation drive system respectively; Wherein, in the driving mode, the switch device is in the first working state so that the output power of the second motor is transmitted only to the power combination device through the switch device but not to the working drive system, so that the output power from the first motor and the second motor is combined through the power combination device, and then the combined power is output to the power transmission mechanism, Wherein, in the operation mode, the output power of the first motor is transmitted to the power combination device, and the switch device is in the second working state so that the output power of the second motor is only transmitted to the operation drive system but not to the power combination device.

2. The electrified power system according to claim 1, wherein: The power combination device is a torque coupling device, In the driving mode, the switching device is in a first working state so that the output power of the second motor is transmitted to the torque coupling device, so that the torque from the output power of the first motor and the second motor is coupled through the torque coupling device and then output to the power transmission mechanism.

3. The electrified power system according to claim 2, wherein: The torque coupling device is composed of a first input shaft, a first set of gear pairs, a second input shaft, a second set of gear pairs and an output shaft. Wherein, the first gear pair is composed of a first gear and a second gear meshing with each other; Wherein, the second gear pair is composed of the second gear and the third gear meshing with each other; Wherein, one end of the first input shaft is connected to the power output end of the first motor as the first torque input end of the torque coupling device, and the other end is connected to the first gear; Wherein, one end of the second input shaft is connected to the power output end of the second motor as the second torque input end of the torque coupling device, and the other end is connected to the third gear; and One end of the output shaft is connected to the second gear, and the other end is connected to the input end of the power transmission mechanism as a coupling torque output end.

4. The electrified power system according to claim 2 or 3, wherein: The torque coupling device and the power transmission mechanism are integrated, and a common output end of the torque coupling device and the power transmission mechanism is connected to an input end of the differential.

5. The electrified power system according to any one of claims 1 to 3, wherein: The switch device includes a first clutch and a second clutch, the power output end of the second motor is connected to the power combination device through the first clutch, and is connected to the operation drive system through the second clutch. In the driving mode, the switch device is in the first working state, the first clutch is engaged and the second clutch is disengaged, so that the output power of the second motor is transmitted only to the power combination device but not to the working drive system. In the working mode, the switch device is in the second working state, the first clutch is disengaged and the second clutch is engaged, so that the output power of the second motor is only transmitted to the working drive system but not to the power combination device.

6. The electrified power system according to any one of claims 1 to 3, wherein: The electrified power system also includes a control unit connected to the switch device, wherein in the driving mode, the control unit puts the switch device in a first working state; in the working mode, the control unit puts the switch device in a second working state.

7. The electrified power system according to claim 5, wherein: The second clutch is a bevel gear clutch capable of changing the rotation direction.

8. The electrified power system according to any one of claims 1 to 3, wherein: The first motor and the second motor are arranged non-coaxially.

9. The electrified power system according to any one of claims 1 to 3, wherein: The electric vehicle is a street sweeper, the operation drive system is a hydraulic system, and the operation equipment is a cleaning equipment including an exhaust fan and a brush.

10. An electric vehicle comprising an electrified power system according to any one of claims 1 to 9.

11. An electrified power system for an electric vehicle, the electrified power system comprising a travel unit for driving the electric vehicle to move forward and backward and an operation unit for performing various operations, the travel unit comprising a first electric motor; a power transmission mechanism, whose input end is connected to the power output end of the first motor; a differential, whose input end is connected to the output end of the power transmission mechanism; and a driving wheel, which is connected to the output end of the differential and is used to drive the electric vehicle to move forward and backward, and the working unit includes a second motor; A working drive system, whose input end is connected to the power output end of the second motor; and a working device, which is connected to the output end of the working drive system and is used to perform various operations, characterized in that: The electrified power system also includes a power combining device for combining the output power of the first motor and the second motor and providing them to the power transmission mechanism, wherein the power combining device is a torque coupling device, which is composed of a first input shaft, a first group of gear pairs, a second input shaft, a second group of gear pairs and an output shaft, wherein the first group of gear pairs is composed of a first gear and a second gear meshing with each other, and the second group of gear pairs is composed of a second gear and a third gear meshing with each other, one end of the first input shaft is connected to the power output end of the first motor as the first torque input end of the torque coupling device, and the other end is connected to the first gear, one end of the second input shaft is connected to the power output end of the second motor as the second torque input end of the torque coupling device, and the other end is connected to the third gear, one end of the output shaft is connected to the second gear, and the other end is connected to the input end of the power transmission mechanism as a coupled torque output end; and a switch device, connected to the power output terminal of the second motor, the input terminal of the power combination device and the input terminal of the operation drive system respectively; Wherein, in the driving mode, the switch device is in the first working state so that the output power of the second motor is transmitted only to the power combination device through the switch device but not to the working drive system, so that the output power from the first motor and the second motor is combined through the power combination device, and then the combined power is output to the power transmission mechanism, Wherein, in the operation mode, the switch device is in the second working state so that the output power of the second motor is only transmitted to the operation drive system but not to the power combination device.

12. The electrified power system according to claim 11, wherein: In the driving mode, the switching device is in the first working state to transmit the output power of the second motor to the torque coupling device, so that the torque from the output power of the first motor and the second motor is coupled through the torque coupling device and then output to the power transmission mechanism.

13. The electrified power system according to claim 12, wherein: The torque coupling device and the power transmission mechanism are integrated, and a common output end of the torque coupling device and the power transmission mechanism is connected to an input end of the differential.

14. The electrified power system according to any one of claims 11 to 13, wherein: The switch device includes a first clutch and a second clutch, the power output end of the second motor is connected to the power combination device through the first clutch, and is connected to the operation drive system through the second clutch. In the driving mode, the switch device is in the first working state, the first clutch is engaged and the second clutch is disengaged, so that the output power of the second motor is transmitted only to the power combination device but not to the working drive system. In the working mode, the switch device is in the second working state, the first clutch is disengaged and the second clutch is engaged, so that the output power of the second motor is only transmitted to the working drive system but not to the power combination device.

15. The electrified power system according to any one of claims 11 to 13, wherein: The electrified power system also includes a control unit connected to the switch device, wherein in the driving mode, the control unit puts the switch device in a first working state; in the working mode, the control unit puts the switch device in a second working state.

16. The electrified power system of claim 14, wherein: The second clutch is a bevel gear clutch capable of changing the rotation direction.

17. The electrified power system according to any one of claims 11 to 13, wherein: The first motor and the second motor are arranged non-coaxially.

18. The electrified power system according to any one of claims 11 to 13, wherein: The electric vehicle is a street sweeper, the operation drive system is a hydraulic system, and the operation equipment is a cleaning equipment including an exhaust fan and a brush.

19. An electric vehicle comprising an electrified power system according to any one of claims 11 to 18.

Images