Power supply system of new energy automobile train and new energy automobile train

Abstract

The utility model relates to a power supply system of a new energy automobile train and the new energy automobile train, and the system comprises a power battery which is used for providing a first DC voltage; the first electric energy converter and the power battery are arranged on one of the tractor and the trailer, and the first electric energy converter is used for conducting electric energy conversion on the first direct-current voltage to obtain second direct-current voltage used for transmission and first alternating current used for driving the motor to operate; the second electric energy converter is arranged on the other one of the tractor and the trailer and is used for converting the second direct current voltage into second alternating current for driving the motor to operate; and the wire harness fixing device is used for fixing the electric energy transmission line between the first electric energy converter and the second electric energy converter. The tractor and the trailer share the same set of power battery, so that the purchase cost and management difficulty of a power supply system are reduced, and the effective load of the vehicle is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of automobile trains, and specifically relates to a power supply system of a new energy automobile train and a new energy automobile train. Background Art

[0002] A car train usually consists of a tractor and a trailer, and is mainly used to transport large items, liquids, gases or concrete, etc.; the new energy car trains currently on the market are equipped with power batteries on the tractor and trailer respectively, which increases the purchase cost of the batteries; in addition, the two sets of power batteries need to be maintained and managed separately, which increases the maintenance cost and management difficulty.

[0003] It can be seen that the power supply system of new energy vehicle trains in the existing technology has the problems of high cost and difficult management. Utility Model Content

[0004] The present application provides a power supply system for a new energy vehicle train and a new energy vehicle train, which solves the problems of high cost and difficult management of the power supply system for the new energy vehicle train.

[0005] In a first aspect, the present application provides a power supply system for a new energy vehicle train, wherein the new energy vehicle train includes a tractor and a trailer, wherein the tractor includes a tractor motor, and the trailer includes a trailer motor. The power supply system includes: a power battery, which is arranged on one of the bodies of the tractor and the trailer, and is used to provide a first DC voltage; a first electric energy converter, which is arranged on the same body as the power battery, wherein the input end of the first electric energy converter is connected to the output end of the power battery, and the first output end of the first electric energy converter is connected to the motor of the corresponding body, and the second electric energy converter is used to convert the first DC voltage into electric energy to obtain a first DC voltage for transmission. a second DC voltage transmitted and a first AC power used to drive the motor to operate; a second power converter, which is arranged on the other body of the tractor and the trailer, the input end of the second power converter is connected to the second output end of the first power converter through a power transmission line, the output end of the second power converter is connected to the motor of the corresponding body, and the second power converter is used to convert the second DC voltage into a second AC power that drives the motor to operate; a wiring harness fixing device, which is arranged between the first power converter and the second power converter, and is used to fix the power transmission line between the first power converter and the second power converter.

[0006] Optionally, the wire harness fixing device includes: a first wire harness fixing assembly; the first wire harness fixing assembly includes: a support rod, a first end of the support rod being fixedly disposed on the trailer, and a second end of the support rod being suspended and extending toward the tractor; a first wire harness clamp, disposed near the first end of the support rod, for fixing the power transmission line led out from the trailer; and a second wire harness clamp, disposed near the second end of the support rod, for fixing the power transmission line led out from the tractor.

[0007] Optionally, the vertical height of the second harness clamp is higher than the vertical height of the second harness clamp.

[0008] Optionally, the support rod includes: a vertical rod, a first end of which is fixedly disposed on the trailer; and a transverse rod, a first end of which is intersecting with a second end of the vertical rod, and a second end of the transverse rod is suspended and extends toward the tractor.

[0009] Optionally, when the trailer is a concrete mixer body, the concrete mixer body includes a water tank and a water tank bracket that supports the water tank; the first wiring harness fixing assembly also includes: a support plate, the support plate is fixedly connected to the water tank bracket, and the first end of the support rod is fixedly arranged on the surface of the support plate; the support plate includes at least one through hole for the power transmission line to pass through.

[0010] Optionally, the wire harness fixing device also includes: a second wire harness fixing assembly, which is arranged on the first power converter or the second power converter on the tractor, and the vertical height of the setting position of the second wire harness fixing assembly is smaller than the vertical height of the setting position of the second wire harness clamp, and is used to fix the power transmission line led out from the tractor.

[0011] Optionally, the first power converter includes a first shell, the bottom surface of the first shell has a first opening, and the power transmission line passes through the first opening to be electrically connected to the second output terminal of the first power converter; the second power converter includes a second shell, the side of the second shell away from the first power converter has a second opening, and the power transmission line passes through the second opening to be electrically connected to the input terminal of the second power converter.

[0012] Optionally, the second wire harness fixing assembly is arranged on a side of the first shell or the second shell close to the trailer.

[0013] In a second aspect, the present application provides a new energy vehicle train, which includes: a tractor, the tractor includes a tractor motor, and the tractor motor includes a tractor electric drive axle for driving the wheels of the tractor to rotate; a trailer, connected to the tractor, the trailer includes a trailer motor, and the trailer motor includes a trailer electric drive axle for driving the wheels of the trailer to rotate; a power supply system of the new energy vehicle train, which is electrically connected to the tractor motor and the trailer electric drive axle, respectively, for providing electrical energy to the tractor motor and the trailer electric drive axle.

[0014] Optionally, the trailer motor also includes a mounted motor; the power supply system is also electrically connected to the mounted motor to provide electrical energy to the mounted motor.

[0015] The technical solution provided by this application has at least the following beneficial effects:

[0016] 1. The present application arranges a power battery and a first power converter on one of the tractor or trailer of a new energy vehicle train, arranges a second power converter on the other, and transmits power between the first power converter and the second power converter so that the tractor and the trailer share the same power battery, which not only reduces the purchase cost and management difficulty of the power supply system, but also reduces the vehicle's own weight and increases the effective load of the trailer.

[0017] 2. The present application fixes the power transmission line between the first power converter and the second power converter through a wiring harness fixing device to prevent the new energy vehicle train from causing entanglement and wear on the power transmission line when turning or bumping, thereby improving the safety and stability of power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0019] Figure 1 Shown is a structural schematic diagram of a power supply system for a new energy vehicle train provided in an embodiment of the present application.

[0020] Figure 2 Shown is a schematic structural diagram of another power supply system for a new energy vehicle train provided in an embodiment of the present application.

[0021] Figure 3 Shown is a schematic structural diagram of a wire harness fixing device provided in an embodiment of the present application.

[0022] Figure 4 Shown is a schematic diagram of an application scenario of a wire harness fixing device provided in an embodiment of the present application.

[0023] Figure 5 Shown is a schematic diagram of the electrical structure of a new energy vehicle train provided in an embodiment of the present application.

[0024] Figure 6 Shown is a schematic diagram of the electrical structure of another new energy vehicle train provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 100. Power supply system of new energy vehicle train; 110. Power battery; 120. First power converter; 130. Second power converter; 140. Wire harness fixing device; 150. Power transmission line;

[0027] 141, first wire harness fixing assembly; 1411, support rod; 1412, first wire harness clamp; 1413, second wire harness clamp; 1414, support plate; 142, second wire harness fixing assembly;

[0028] 200, tractor motor; 300, trailer motor; 400, battery bracket; 500, water tank; 600, water tank bracket. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0030] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0031] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0032] In a first aspect, the present application provides a power supply system for a new energy vehicle train, which specifically includes the following embodiments:

[0033] Figure 1 The figure shows a structural block diagram of a power supply system for a new energy vehicle train provided in an embodiment of the present application; Figure 2 FIG. 1 is a structural block diagram of another power supply system for a new energy vehicle train provided in an embodiment of the present application; Figure 1 and Figure 2 As shown, the new energy vehicle train includes a tractor and a trailer connected to the tractor, the tractor includes a tractor motor 200 for driving the wheels of the tractor to rotate, and the trailer includes a trailer motor 300 for driving the wheels of the trailer to rotate.

[0034] It should be noted that the trailer may be a semitrailer, a center axle trailer, a drawbar trailer or a rigid bar trailer.

[0035] In this embodiment, the power supply system 100 of the new energy vehicle train includes: a power battery 110, which is arranged on one of the tractor and the trailer, and is used to provide a first DC voltage; the power battery 110 can be arranged on the tractor, such as Figure 1 As shown; the power battery 110 can also be set on the trailer, such as Figure 2 As shown; the first DC voltage is a high voltage DC voltage of 200 to 800 volts; since the larger the capacity of the power battery 110, the greater its own weight, the arrangement of power batteries on both the tractor and the trailer will increase the weight of the new energy vehicle train; therefore, by sharing a power battery 110 between the tractor and the trailer, the dead weight of the new energy vehicle train can be reduced, especially when the power battery 110 is arranged on the tractor, the weight of the trailer can be reduced, thereby increasing the effective load of the trailer.

[0036] In this embodiment, the power supply system 100 of the new energy vehicle train also includes: a first power converter 120, which is arranged on the same vehicle as the power battery 110, and the input end of the first power converter 120 is connected to the output end of the power battery 110, and the first power converter 120 has a first output end and a second output end, wherein the first output end of the first power converter is connected to the corresponding motor, and the first power converter is used to convert the first DC voltage into power to obtain a second DC voltage for transmission and a first AC power for driving the motor to operate; wherein the motor corresponding to the first power converter 120 is the motor on the vehicle where the first power converter 120 is located.

[0037] It should be noted that the first power converter 120 is arranged along with the power battery 110, that is, when the power battery 110 is arranged on the tractor, the first power converter 120 is also arranged on the tractor. Figure 1As shown; when the power battery 110 is arranged on the trailer, the first power converter 120 is also arranged on the trailer. The first power converter 120 is mainly used to convert the first DC voltage output by the power battery 110 into three-phase AC power, so that the three-phase AC power drives the motor on the vehicle where the first power converter 120 is located to operate. For example, when the first power converter 120 is on the tractor, the AC power output by the first power converter 120 drives the tractor motor 200 to operate. When the first power converter 120 is on the trailer, the AC power output by the first power converter 120 drives the trailer motor 300 to operate. In addition, the first power converter 120 is also used to convert the first DC voltage output by the power battery 110 into a second DC voltage, and the second DC voltage is mainly used for power transmission. The first DC voltage and the second DC voltage may be the same or different. When the first DC voltage and the second DC voltage are the same, it indicates that the first power converter 120 directly transfers the first DC voltage output by the power battery 110. When the first DC voltage and the second DC voltage are different, it indicates that the first power converter 120 steps down or steps up the first DC voltage output by the power battery 110 for transmission.

[0038] In this embodiment, the power supply system 100 of the new energy vehicle train also includes: a second power converter 130, which is arranged on the other of the tractor and the trailer, and the input end of the second power converter 130 is connected to the second output end of the first power converter 120 through the power transmission line 150, and the output end of the second power converter 130 is connected to the corresponding motor, which is used to convert the second DC voltage into a second AC power for driving the motor; wherein the motor corresponding to the second power converter 130 is the motor on the vehicle where the second power converter 130 is located.

[0039] It should be noted that the second power converter 130 is arranged in the opposite position to the first power converter 120, that is, when the first power converter 120 is arranged on the tractor, the second power converter 130 is arranged on the trailer; when the first power converter 120 is arranged on the trailer, the second power converter 130 is arranged on the tractor; the second power converter 130 is mainly used to convert the second DC voltage output by the first power converter 120 into three-phase AC power, so that the three-phase AC power drives the motor on the vehicle where the second power converter 130 is located to operate, when the second power converter 130 is on the tractor, the motor on the vehicle where the second power converter 130 is located is the tractor motor 200, and when the second power converter 130 is on the trailer, the motor on the vehicle where the second power converter 130 is located is the trailer motor 300; in addition, by connecting the second power converter 130 to the first power converter 120, the output interface of the power battery 110 can be expanded.

[0040] In this embodiment, the power supply system 100 of the new energy vehicle train further includes: a wire harness fixing device 140 for fixing the power transmission line 150 between the first power converter 120 and the second power converter 130 .

[0041] It should be noted that the power transmission line between the first power converter 120 and the second power converter 130 is fixed by the wire harness fixing device 140 to prevent the new energy vehicle train from causing entanglement and wear on the power transmission line when turning or bumping, thereby improving the safety and stability of power transmission.

[0042] The technical solution provided by this embodiment has at least the following beneficial effects:

[0043] 1. The present application arranges a power battery and a first power converter on one of the tractor and the trailer, arranges a second power converter on the other of the tractor and the trailer, and transmits power between the first power converter and the second power converter so that the tractor and the trailer share the same power battery, which not only reduces the purchase cost and management difficulty of the power supply system, but also reduces the vehicle's own weight and increases the effective load of the trailer.

[0044] 2. The present application fixes the power transmission line between the first power converter and the second power converter through a wiring harness fixing device to prevent the new energy vehicle train from causing entanglement and wear on the power transmission line when turning or bumping, thereby improving the safety and stability of power transmission.

[0045] In one embodiment, if Figure 3 As shown, the wire harness fixing device 140 includes: a first wire harness fixing assembly 141; the first wire harness fixing assembly 141 includes: a support rod 1411, a first end of the support rod 1411 is set on the trailer, and a second end of the support rod 1411 is suspended and extends toward the tractor.

[0046] In one embodiment, the vertical height of the second end of the support rod 1411 is higher than the vertical height of the first end of the support rod 1411, so that the vertical height of the second wire harness clamp is higher than the vertical height of the second wire harness clamp.

[0047] It should be noted that the support rod 1411 has the function of pulling the power transmission line upward, thereby increasing the length of the power transmission line 150 between the first power converter 120 and the second power converter 130, so that the length of the power transmission line between the first power converter 120 and the second power converter 130 is greater than the straight-line distance between the first power converter 120 and the second power converter 130, thereby preventing the new energy vehicle train from entangled in the power transmission line during the movement; in addition, the second end of the support rod 1411 is higher than the first end of the support rod 1411, so that the power transmission line passing through the support rod 1411 is vacated to prevent friction with other components.

[0048] In one embodiment, the support rod 1411 may be an L-shaped support rod 1411 or an arc-shaped support rod 1411; wherein, the L-shaped support rod 1411 or the arc-shaped support rod 1411 can increase the vertical height distance difference between the two ends of the support rod 1411, and can also increase the supporting force on the power transmission line.

[0049] In one embodiment, the support rod includes: a vertical rod, a first end of which is fixedly disposed on the trailer; and a transverse rod, a first end of which is intersecting with a second end of the vertical rod, and a second end of the transverse rod is suspended and extends toward the tractor.

[0050] In one embodiment, the first harness fixing assembly 141 includes a first harness clamp 1412 disposed near the first end of the support rod 1411, and a second harness clamp 1413 disposed near the second end of the support rod 1411. The first harness clamp 1412 is used to fix the power transmission line led out from the trailer, such as Figure 3 As shown, the power transmission line led out from the second power converter 130 is fixed near the first end of the support rod 1411 by the first wiring harness clamp 1412, which can reduce the tension applied by the wiring harness of the ab segment to the point a and ensure a stable connection between the power transmission line and the second power converter 130.

[0051] In addition, the second harness clamp 1413 is used to fix the power transmission line led out from the tractor; Figure 3 As shown, the power transmission line led out from the first power converter 120 is fixed to the second end of the support rod 1411 through the second wiring harness clamp 1413. Since the second end of the support rod 1411 is higher than the first end, the wiring harness of the CD segment is pulled to prevent friction between the power transmission line and the trailer, thereby avoiding damage to the transmission line.

[0052] In one embodiment, if Figure 4As shown in 4a and 4b, the trailer can be a concrete mixer trailer, which includes a water tank 500 and a water tank bracket 600 that supports the water tank 500; the first wiring harness fixing assembly also includes: a support plate 1414, the support plate 1414 is fixedly connected to the water tank bracket 600, and the first end of the support rod 1411 is fixedly set on the surface of the support plate 1414; the support plate 1414 includes at least one through hole for the power transmission line to pass through.

[0053] It should be noted that the support plate 1414 is used to achieve a fixed connection between the support rod 1411 and the water tank bracket 600, thereby improving the stability of the connection; since the setting position of the water tank bracket 600 is higher than the setting position of the first power converter 120 or the second power converter 130 on the trailer, a through hole is set on the support plate 1414, and the power transmission line led out from the first power converter 120 or the second power converter 130 can be pulled to the first wiring harness clamp 1412 through the through hole, thereby reducing the wiring harness length of the ab segment and simplifying the wiring of the power transmission line.

[0054] In addition, the support rod 1411 is arranged on the water tank bracket 600, which increases the vertical height of the CD segment harness, thereby increasing the length of the power transmission line between the tractor and the trailer, so that the new energy vehicle train will not cause entanglement to the power transmission line when turning.

[0055] In one embodiment, if Figure 3 As shown, the wire harness fixing device 140 also includes: a second wire harness fixing component 142, which is arranged on the first power converter 120 or the second power converter 130 on the tractor, and the vertical height of the setting position of the second wire harness fixing component 142 is smaller than the vertical height of the setting position of the second wire harness clamp 1413, and is used to fix the power transmission line led out from the tractor.

[0056] It should be noted that the second wiring harness fixing component 142 is specifically a third wiring harness clamp, which is used to fix the power transmission line led out from the first power converter 120 or the second power converter 130, and can simultaneously reduce the pulling force of the power transmission line on points c and e; in addition, the installation position of the third wiring harness clamp is lower than the installation position of the second wiring harness clamp 1413, so that the power transmission line of the cd section can hang down naturally, and can also prevent the drooping power transmission line from touching the crossbeam of the tractor. In this way, on the one hand, it can avoid the distance between the tractor and the trailer changing when the vehicle turns, causing the power transmission line to be pulled, and on the other hand, it can avoid the friction between the wiring harness and the crossbeam of the tractor to damage the wiring harness.

[0057] In this embodiment, the second power converter 130 on the trailer is installed on the battery bracket 400 of the trailer close to the tractor, considering that the installation location should be convenient for connecting and disconnecting the interface; the high and low voltage wire harnesses connected to the tractor and the wire harnesses inside the trailer should be arranged in a reasonable space and channel, and consideration should be given to preventing the wire harnesses from being pulled or rubbed during driving. Figure 4 As shown in 4b, the wire harness is led out from point e to prevent rainwater from flowing along the high-voltage line after the hole in the upper cover is opened. A second wire harness fixing assembly 142 ( Figure 4 (not shown in the figure), the downward pulling force exerted by the ed part of the harness on the point c can be reduced. By installing the first harness fixing component 141 at the position of the water tank 500, the downward pulling force exerted by the ab part of the harness on the point c can be reduced. The first harness fixing component 141 and the second harness fixing component 142 fix the power transmission line. While fixing the harness to avoid friction, the force on the point c is also reduced, which can better protect the harness. In addition, the straight-line distance between the dc part of the harness is longer than that between the new energy vehicle train and the dc in a straight-line driving state. The extended harness is shown in 4b, and it droops naturally, and the droop will not touch the tractor beam. In this way, on the one hand, it can avoid the change of the dc distance when the vehicle train turns, causing the harness to be pulled, and on the other hand, it can avoid the friction between the harness and the tractor beam to damage the harness.

[0058] In one embodiment, the first power converter 120 includes a first housing, the bottom surface of the first housing has a first opening, and the power transmission line passes through the first opening and is electrically connected to the second output terminal of the first power converter 120;

[0059] Optionally, the second power converter 130 includes a second shell having a second opening on a side of the second shell away from the first power converter, and the power transmission line passes through the second opening and is electrically connected to an input end of the second power converter 130 .

[0060] Optionally, the third harness clamp is arranged on a side of the first housing or the second housing close to the trailer.

[0061] It should be noted that the first shell is provided to protect the first power converter 120 from being damaged by external forces; in addition, a first opening is provided on the bottom surface of the first shell so that the power transmission line passes through the first opening and is connected to the first power converter 120 to prevent rainwater from flowing into the first power converter 120 and causing a safety accident; optionally, the second shell is provided to protect the second power converter 130 from being damaged by external forces.

[0062] In addition, a second opening is provided on the side of the second shell away from the first power converter, so that the power transmission line passes through the second opening and is electrically connected to the input end of the second power converter 130. In addition, the power line at the output end of the first power converter is also connected to the corresponding motor through the second opening, which can optimize the wiring method of the transmission line of the second power converter.

[0063] In a second aspect, the present application provides a new energy vehicle train, which specifically includes the following embodiments:

[0064] In one embodiment, a new energy vehicle train includes: a tractor, a trailer and a power supply system provided in the above embodiments; wherein the tractor includes a tractor motor, and the tractor motor includes a tractor electric drive axle for driving the wheels of the tractor to rotate; the trailer is connected to the tractor, and the trailer includes a trailer motor, and the trailer motor includes a trailer electric drive axle for driving the wheels of the trailer to rotate; the power supply system of the new energy vehicle train is electrically connected to the tractor motor and the trailer electric drive axle respectively, for providing electrical energy to the tractor motor and the trailer electric drive axle.

[0065] In one embodiment, the trailer motor also includes a body motor; the power supply system is also electrically connected to the body motor to provide electrical energy to the body motor.

[0066] like Figure 5 As shown, the tractor carries a power battery, and the main controller on the tractor includes a first power converter. The output of the first power converter has two paths, one of which is to provide three-phase AC power to the tractor motor on the tractor, and the other is to provide high-voltage DC power to the slave controller on the trailer, so that the slave controller distributes power to the trailer motor, wherein the trailer motor includes Figure 5 The trailer electric drive axle and the upper motor; Figure 6 As shown, if the trailer carries a power battery, the controller on the trailer is used as the main controller, which includes a first power converter, and the output of the first power converter has two paths, one is to provide three-phase AC power to the trailer motor on the trailer, and the other is to provide high-voltage DC power to the slave controller on the tractor, so that the slave controller distributes power to the tractor motor. Figure 5 and Figure 6 The main controller can be the first power converter, or it can be an all-in-one controller having the functions of the first power converter and other control functions; similarly, the slave controller can be the second power converter, or it can be an all-in-one controller having the functions of the second power converter and other control functions.

[0067] It should be noted that the trailer motor may also only include the trailer electric drive axle, in which case the trailer may be a container transport trailer, a flatbed trailer, a fence trailer, a plate trailer or a fence trailer, etc., which are not equipped with electric upper parts;

[0068] The upper mounted motor can be a refrigeration machine, in which case the trailer is a refrigerated trailer; the upper mounted motor can also be a motor that drives a concrete mixing drum, in which case the trailer is a concrete mixing trailer; the upper mounted motor can also be a motor that drives a lifting device, in which case the trailer is a dump trailer; the upper mounted motor can also be a motor that drives other electric upper mounted motors.

[0069] In one embodiment, the new energy vehicle train further includes an engine, a clutch and a transmission arranged on a tractor, wherein the clutch is arranged between the engine and the tractor motor.

[0070] In one embodiment, the new energy vehicle train further includes a battery management system (BMS), which is electrically connected to the power battery and is used to monitor the remaining power value of the power battery and to control the charging and discharging of the power battery.

[0071] In one embodiment, the new energy vehicle train also includes a power control system, which includes a tractor control unit, a trailer control unit, an engine electronic control unit (engine ECU), a transmission control unit, a tractor electronic braking system (EBS), a trailer electronic braking system (TEBS), and an on-board terminal (T-BOX); wherein the engine ECU is respectively communicated with the tractor control unit and the engine, the transmission control unit is respectively communicated with the tractor control unit and the transmission, and CAN communication is realized between the battery management system (BMS), the tractor control unit, the tractor electronic braking system, the trailer electronic braking system, and the on-board terminal. In addition, in addition to communicating with the corresponding tractor control unit and trailer control unit, the tractor electronic braking system and the trailer electronic braking system also have a separate CAN communication between the two to avoid communication line failures affecting the normal communication of the power control system.

[0072] It should be noted that the energy recovery and power distribution of the power supply system are controlled by the power control system: after the high voltage between the first power converter and the second power converter is connected, the driving force distribution and energy recovery between the tractor and the trailer are received through the CAN communication module (not shown in the figure) The current maximum allowable power of the upper motor and the trailer electric drive axle sent by the trailer control unit is received, and the power is uniformly distributed in the tractor control unit, so that when braking, the trailer gives priority to using the energy recovery of the tractor and trailer for electric braking, and the insufficient part is supplemented by mechanical braking.

[0073] In terms of energy recovery, if the trailer power battery is eliminated, all recovered electrical energy can be provided to the power battery on the tractor during braking. The specific strategy is that when the trailer brakes, it gives priority to using the energy recovery of the tractor and trailer for electric braking, and the insufficient part is supplemented by mechanical braking.

[0074] In terms of driving force distribution, the tractor control unit distributes driving force according to the maximum power allowed by the trailer electric drive axle fed back by the semi-trailer control unit and the energy management strategy of the current power battery SOC value; the specific energy management strategy is as follows:

[0075] (1) When the battery SOC value is between 100% and 95%, the tractor is in pure electric mode, allowing all modules to request power and prohibiting the tractor's electric drive axle ( Figure 5 , 6 Energy recovery for the tractor motor, trailer electric drive axle and bodywork motor;

[0076] (2) When the battery SOC value is between 95% and 30%, the tractor is in pure electric mode, allowing power requests from all modules and energy recovery from the tractor electric drive axle, trailer electric drive axle, and superstructure;

[0077] (3) When the battery SOC value is between 30% and 10%, the tractor is in pure electric mode, allowing the tractor's electric drive axle to drive normally, allowing the trailer's mounted motor to drive normally, prohibiting the trailer's electric drive axle from driving, and allowing energy recovery for the tractor's electric drive axle, trailer's electric drive axle and mounted motor.

[0078] (4) When the battery SOC value is lower than 10%, the tractor switches to fuel mode, prohibiting the tractor electric drive axle from driving, prohibiting the trailer electric drive axle from driving, allowing the trailer mounted motor to drive, and allowing energy recovery of the tractor body electric drive axle, trailer electric drive axle and mounted motor.

[0079] It can be seen that since there is only one power battery system in the new energy vehicle train in this embodiment, the overall mass can be effectively reduced and the carrying capacity can be improved; in addition, since the power batteries are concentrated on the tractor or trailer, the battery management and maintenance become simple and convenient, the failure rate caused by multiple battery systems is reduced, and the reliability of the vehicle is improved; and by using the power batteries of the tractor or trailer, it is easy to achieve the optimal distribution and recovery of electricity, thereby improving the energy efficiency of the entire system.

[0080] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third" may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0081] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent of this application.

Claims

1. A power supply system for a new energy vehicle train, the new energy vehicle train comprising a tractor and a trailer, the tractor comprising a tractor motor, the trailer comprising a trailer motor, characterized in that: The power supply system comprises: a power battery, arranged on one of the tractor and the trailer, and configured to provide a first DC voltage; a first electric energy converter, which is arranged on the same vehicle as the power battery, wherein an input end of the first electric energy converter is connected to an output end of the power battery, a first output end of the first electric energy converter is connected to a motor of a corresponding vehicle, and the first electric energy converter is used to convert the first DC voltage into electric energy to obtain a second DC voltage for transmission and a first AC power for driving the motor; a second electric energy converter, arranged on the other of the tractor and the trailer, wherein the input end of the second electric energy converter is connected to the second output end of the first electric energy converter via an electric energy transmission line, the output end of the second electric energy converter is connected to the motor of the corresponding vehicle, and the second electric energy converter is used to convert the second DC voltage into a second AC power for driving the motor; The wire harness fixing device is arranged between the first power converter and the second power converter, and is used for fixing the power transmission line between the first power converter and the second power converter.

2. The power supply system for the new energy vehicle train according to claim 1 is characterized in that: The wire harness fixing device comprises: a first wire harness fixing component; the first wire harness fixing component comprises: A support rod, wherein a first end of the support rod is fixedly disposed on the trailer, and a second end of the support rod is suspended and extends toward the tractor; a first harness clamp, disposed near the first end of the support rod, for fixing the power transmission line led out from the trailer; The second harness clamp is arranged near the second end of the support rod and is used for fixing the electric energy transmission line led out from the tractor.

3. The power supply system for the new energy vehicle train according to claim 2 is characterized in that: The vertical height of the second harness clamp is higher than the vertical height of the second harness clamp.

4. The power supply system for the new energy vehicle train according to claim 3 is characterized in that: The support rod comprises: A vertical rod, a first end of which is fixedly disposed on the trailer; A transverse rod, wherein a first end of the transverse rod is arranged to intersect with a second end of the vertical rod, and a second end of the transverse rod is arranged to be suspended and extends toward the direction of the tractor.

5. The power supply system for the new energy vehicle train according to claim 2, characterized in that: When the trailer is a concrete mixer trailer, the concrete mixer trailer includes a water tank and a water tank bracket carrying the water tank; the first wiring harness fixing assembly also includes: A support plate, wherein the support plate is fixedly connected to the water tank bracket, and the first end of the support rod is fixedly arranged on the surface of the support plate; the support plate includes at least one through hole for the electric energy transmission line to pass through.

6. The power supply system for the new energy vehicle train according to any one of claims 2 to 5, characterized in that: The wiring harness fixing device also includes: The second wire harness fixing assembly is arranged on the first power converter or the second power converter on the tractor, and the vertical height of the setting position of the second wire harness fixing assembly is smaller than the vertical height of the setting position of the second wire harness clamp, and is used to fix the power transmission line led out from the tractor.

7. The power supply system for the new energy vehicle train according to claim 6, characterized in that: The first power converter comprises a first housing, the bottom surface of the first housing has a first opening, the power transmission line passes through the first opening and is electrically connected to the second output end of the first power converter; The second power converter comprises a second shell, and a second opening is provided on a side of the second shell away from the first power converter. The power transmission line passes through the second opening and is electrically connected to an input end of the second power converter.

8. The power supply system for the new energy vehicle train according to claim 7, characterized in that: The second wire harness fixing assembly is arranged on a side of the first housing or the second housing close to the trailer.

9. A new energy vehicle train, characterized in that: The new energy vehicle train comprises: A tractor, the tractor comprising a tractor motor, the tractor motor comprising a tractor electric drive axle for driving the wheels of the tractor to rotate; A trailer connected to the tractor, the trailer comprising a trailer motor, the trailer motor comprising a trailer electric drive axle for driving the wheels of the trailer to rotate; The power supply system of the new energy vehicle train according to any one of claims 1 to 8 is electrically connected to the tractor motor and the trailer electric drive axle, respectively, and is used to provide electrical energy to the tractor motor and the trailer electric drive axle.

10. The new energy vehicle train according to claim 9, characterized in that: The trailer motor also includes a top-mounted motor; The power supply system is also electrically connected to the upper motor and is used to provide electrical energy to the upper motor.

Images