Electric wheel mining dump truck electric transmission system and energy management control method

Abstract

The invention relates to the technical field of mining trucks, and discloses an electric transmission system and an energy management control method of an electric wheel mining dump truck, the electric transmission system comprises a power system, a rectification inversion system and a driving system, and further comprises a power battery, a bidirectional DC / DC module and an auxiliary system; the power system comprises an engine and an alternating-current generator. The output end of the engine is connected with the input end of the alternating-current generator. The rectification and inversion system comprises a rectifier and an inverter, the input end of the rectifier is connected with the output end of the alternating-current generator, and the output end of the rectifier is connected with the first end of the inverter; the driving system comprises an electric wheel, and the electric wheel is bidirectionally and electrically connected with the second end of the inverter; the first end of the bidirectional DC / DC module is bidirectionally and electrically connected with the first end of the inverter, the second end of the bidirectional DC / DC module is bidirectionally and electrically connected with the power battery, and the third end of the bidirectional DC / DC module is connected with the auxiliary system. The energy utilization rate can be increased, energy recovery is achieved, and emission of pollutants is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of mining vehicles, and in particular to an electric transmission system and an energy management control method for an electric wheel mining dump truck. Background Art

[0002] At present, with the continuous application of electric transmission technology, an electric wheel mining dump truck has appeared on the market. The electric transmission system of the electric wheel mining dump truck uses a diesel engine to drive an AC generator to generate electricity, and then sends the electricity to the electric wheels to drive the vehicle. Compared with diesel engine-driven vehicles, it can generate greater instantaneous explosive power and is more suitable for mining. Figure 1 It is a structural schematic diagram of an electric transmission system in the prior art, such as Figure 1 As shown, the electric transmission system includes a power system, a rectifier inverter system and a drive system, and the rectifier inverter system transmits power between the power system and the drive system. The power system includes a diesel engine and an AC generator, and the diesel engine and the AC generator are mechanically connected. The rectifier inverter system includes a rectifier and an inverter, and the AC generator, the rectifier and the inverter are connected in sequence. The drive system includes an electric wheel, and the inverter is connected to the electric wheel. The control method for energy conversion of the electric transmission system of the electric wheel mining dump truck mainly includes two links: one is the mechanical energy-electric energy conversion link, that is, the mechanical energy generated by the diesel engine burning fossil energy is converted into electrical energy through the AC generator; the second is the electrical energy-mechanical energy conversion link, that is, the electrical energy is sent to the electric wheel to drive the vehicle.

[0003] However, when the electric drive system of the electric wheel mining dump truck performs energy conversion, the conversion between different forms of mechanical energy and electrical energy will produce losses, and the rectifier inverter circuit will also produce losses in the process of transmitting energy. At the same time, the emission density of the diesel engine is large, especially when the power demand is large, resulting in a large amount of pollutant emissions. Therefore, the existing electric wheel mining dump truck has problems such as low energy utilization, non-recyclable energy, and high emission density.

[0004] Therefore, it is necessary to provide an improved technical solution to overcome the above technical problems existing in the prior art. Summary of the invention

[0005] The purpose of the present application is to provide an electric drive system and an energy management control method for an electric wheel mining dump truck, which can improve energy utilization, realize energy recovery, and reduce pollutant emissions.

[0006] To achieve the above-mentioned purpose, an embodiment of the present application provides an electric transmission system for an electric wheel mining dump truck, which includes a power system, a rectifier and inverter system, and a drive system, and also includes a power battery, a bidirectional DC / DC module, and an auxiliary system; the power system includes an engine and an AC generator, and the output end of the engine is connected to the input end of the AC generator; the rectifier and inverter system includes a rectifier and an inverter, the input end of the rectifier is connected to the output end of the AC generator, and the output end of the rectifier is connected to the first end of the inverter; the drive system includes an electric wheel, and the electric wheel is bidirectionally electrically connected to the second end of the inverter; the first end of the bidirectional DC / DC module is bidirectionally electrically connected to the first end of the inverter, the second end of the bidirectional DC / DC module is bidirectionally electrically connected to the power battery, and the third end of the bidirectional DC / DC module is connected to the auxiliary system.

[0007] In one embodiment, the electric transmission system of the electric wheel mining dump truck includes an electric control braking system, which includes a chopper and a braking resistor, the input end of the chopper is connected to the first end of the inverter, and the output end of the chopper is connected to the braking resistor.

[0008] In one embodiment, the bidirectional DC / DC module includes a first conversion circuit, a second conversion circuit and a third conversion circuit, the first conversion circuit is respectively connected to the first end and the second end of the bidirectional DC / DC module, the second conversion circuit is respectively connected to the second end and the third end of the bidirectional DC / DC module, and the third conversion circuit is respectively connected to the first end and the third end of the bidirectional DC / DC module.

[0009] In one embodiment, the auxiliary system includes a bidirectional controller, the third terminal of the bidirectional DC / DC module provides power to the bidirectional controller, and the bidirectional controller is used to control the working state of the bidirectional DC / DC module.

[0010] In one embodiment, the auxiliary system includes a heat sink, the third terminal of the bidirectional DC / DC module provides power to the heat sink, and the heat sink is used to dissipate heat for the bidirectional DC / DC module.

[0011] An embodiment of the present application also provides an energy management control method for an electric transmission system of an electric wheel mining dump truck, which is used for the above-mentioned electric transmission system of an electric wheel mining dump truck, including: if the strong electric excitation of the whole vehicle is effective, then judging whether the parking brake is effective; if the parking brake is effective, then performing parking brake energy management; if the parking brake is invalid, then judging whether the SOC of the power battery is lower than the lower limit; if the SOC of the power battery is lower than the lower limit, then performing forced charging energy management; if the SOC of the power battery is not lower than the lower limit, judging whether the whole vehicle is in a braking condition; if the whole vehicle is in a braking condition, then performing braking condition energy management; if the whole vehicle is not in a braking condition, judging whether the required power of the electric wheel is less than the engine output power; if the required power of the electric wheel is less than the engine output power, then the bidirectional DC / DC module is on standby; if the required power of the electric wheel is not less than the engine output power, then performing traction condition energy management. In one embodiment, the parking brake energy management includes: controlling the operation of the bidirectional DC / DC module and the charging of the power battery, and storing the energy output by the engine in the power battery.

[0012] In one embodiment, the forced charging energy management includes: controlling the operation of the bidirectional DC / DC module and the charging of the power battery, sending a portion of the energy output by the engine to the electric wheel, and storing another portion of the energy output by the engine in the power battery.

[0013] In one embodiment, the braking condition energy management includes: controlling the operation of the bidirectional DC / DC module and the charging of the power battery, and storing the energy fed back by the electric wheel in the power battery.

[0014] In one embodiment, the traction condition energy management includes: controlling the operation of the bidirectional DC / DC module and the discharge of the power battery, and sending the energy of the power battery to the electric wheel to supplement power.

[0015] The electric drive system and energy management control method of the electric wheel mining dump truck provided in the embodiment of the present application are newly provided with a power battery, a bidirectional DC / DC module and an auxiliary system. The power battery can be used as a supplementary and auxiliary power source, and the engine fuel-power battery hybrid power energy management control can be adopted to enable the engine to remain in an efficient operating range, thereby improving energy utilization, realizing energy recovery, and reducing pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a structural schematic diagram of an electric transmission system in the prior art.

[0017] Figure 2This is a schematic structural diagram of the electric transmission system of the electric wheel mining dump truck in the first embodiment of the present application.

[0018] Figure 3 This is a flow chart of the energy management control method of the electric transmission system of the electric wheel mining dump truck in the second embodiment of the present application.

[0019] Among them, 100-power system, 110-engine, 120-AC generator, 200-rectifier inverter system, 210-rectifier, 220-inverter, 300-drive system, 310-electric wheel, 410-power battery, 420-bidirectional DC / DC module, 430-auxiliary system, 500-electronic control braking system, 510-chopper, 520-brake resistor. DETAILED DESCRIPTION

[0020] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0021] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0022] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in this article, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of..." or "when..." or "in response to determination". Furthermore, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising", "including" indicate that there are described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, “A, B, or C” or “A, B and / or C” means “any of the following: A; B; C; A and B; A and C; B and C; A, B, and C.” An exception to this definition will occur only when a combination of elements, functions, steps, or operations are inherently mutually exclusive in some manner.

[0023] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0025] First embodiment See also Figure 2 , Figure 2It is a structural schematic diagram of the electric drive system of the electric wheel mining dump truck in the first embodiment of the present application. This embodiment provides an electric drive system for an electric wheel mining dump truck, which includes a power system 100, a rectifier inverter system 200 and a drive system 300, and also includes a power battery 410, a bidirectional DC / DC module 420 and an auxiliary system 430. The power system 100 includes an engine 110 and an AC generator 120, and the output end of the engine 110 is connected to the input end of the AC generator 120. The rectifier inverter system 200 includes a rectifier 210 and an inverter 220, the input end of the rectifier 210 is connected to the output end of the AC generator 120, and the output end of the rectifier 210 is connected to the first end of the inverter 220. The drive system 300 includes an electric wheel 310, and the electric wheel 310 is bidirectionally electrically connected to the second end of the inverter 220. A first end of the bidirectional DC / DC module 420 is bidirectionally electrically connected to a first end of the inverter 220 , a second end of the bidirectional DC / DC module 420 is bidirectionally electrically connected to the power battery 410 , and a third end of the bidirectional DC / DC module 420 is connected to the auxiliary system 430 .

[0026] Specifically, first, the power system 100 can convert fuel such as fossil energy into mechanical energy through the engine 110, and the engine 110 uses the mechanical energy to drive the AC generator 120 to generate electricity, thereby converting the mechanical energy into electrical energy. Then, the power system 100 is connected to the rectifier inverter system 200, and the power system 100 sends energy to the rectifier inverter system 200, and the rectifier inverter system 200 converts the AC power into DC power through the rectifier 210, and then converts the DC battery into AC power through the inverter 220. Finally, the rectifier inverter system 200 is connected to the drive system 300, and the rectifier inverter system 200 can send energy to the drive system 300, and the electric wheel 310 in the drive system 300 can obtain energy to drive the vehicle to move; the rectifier inverter system 200 can also be connected to the power battery 410 through the bidirectional DC / DC module 420, and can send energy to the power battery 410 through the bidirectional DC / DC module 420 for storage. Especially in working conditions such as braking, the engine 110 can be maintained in an efficient operating range, and the energy provided by the engine 110 can be stored in the power battery 410, thereby improving energy utilization and reducing the emission of pollutants caused by unstable combustion of the engine 110; the rectifier inverter system 200 can also be connected to the auxiliary system 430 through the bidirectional DC / DC module 420, and can send energy to the auxiliary system 430 through the bidirectional DC / DC module 420 to enable the auxiliary system 430 to work. At the same time, the drive system 300 can obtain feedback energy through the electric wheel 310, and transmit energy through the inverter 220 and the bidirectional DC / DC module 420 in the rectifier inverter system 200. The feedback energy can be used to charge the power battery 410, and can also be used to drive the auxiliary system 430 to achieve energy recovery. The power battery 410 is not only used to store energy, but also to provide energy for the drive system 300 and the auxiliary system 430 through the bidirectional DC / DC module 420. In particular, when the power demand of the electric wheel 310 is large, the engine 110 and the power battery 410 can provide energy together to achieve the high power demand of the electric wheel 310, which not only avoids the power shortage that may be caused by the engine 110 providing energy alone, but also avoids the excessive pollutant emissions caused by the engine 110 burning a large amount of fuel to meet the high power. In addition, the auxiliary system 430 is connected to the bidirectional DC / DC module 420, and the auxiliary system 430 can choose to take power from the power battery 410, the power system 100 or the drive system 300 through the bidirectional DC / DC module 420, and can be used to achieve control, heat dissipation and other functions.

[0027] In one embodiment, the energy management method that can be performed by the electric drive system of the electric wheel mining dump truck of the present application may include one or more of the following methods: Parking brake energy management: if a parking brake signal is detected, the bidirectional DC / DC module 420 is controlled to work and the power battery 410 is charged, and the energy output by the engine 110 is stored in the power battery 410. Therefore, under working conditions such as parking brake, the engine 110 can be kept in an efficient operating range, and the energy provided by the engine 110 can be stored in the power battery 410, thereby improving energy utilization and reducing the emission of pollutants caused by unstable combustion of the engine 110.

[0028] Forced charging energy management: including controlling the operation of the bidirectional DC / DC module 420 and the charging of the power battery 410, sending part of the energy output by the engine 110 to the electric wheel 310, and storing another part of the energy output by the engine 110 in the power battery 410. The charging power of the power battery 410 can be adjusted accordingly according to the speed of the engine 110. Thus, the power battery 410 can be forced to charge through the forced charging energy management; in particular, it can be determined whether to perform forced charging energy management according to the size of the SOC of the power battery 410 to ensure that the power battery 410 has reserved energy available at any time.

[0029] Braking condition energy management: including controlling the operation of the bidirectional DC / DC module 420 and the charging of the power battery 410, and storing the energy fed back by the electric wheel 310 in the power battery 410. Therefore, in braking conditions such as deceleration and downhill, the energy fed back by the electric wheel 310 can be stored in the power battery 410, which can realize energy recovery and improve energy utilization.

[0030] Bidirectional DC / DC module 420 is in standby mode: when the power demanded by the electric wheel 310 is less than the output power of the engine 110, only the engine 110 is required to provide energy, and the power battery 410 is not required to provide energy, and the bidirectional DC / DC module 420 is in standby mode. Thus, the engine 110 can be kept in an efficient operating range and provide energy to the electric wheel 310 alone, which can improve energy utilization, realize energy recovery, and reduce pollutant emissions.

[0031] Energy management of traction conditions: When the power demanded by the electric wheel 310 is greater than the output power of the engine 110, the bidirectional DC / DC module 420 is controlled to work and the power battery 410 is controlled to discharge, and the energy of the power battery 410 is sent to the electric wheel 310 to supplement the power. Thus, in traction conditions such as uphill and acceleration, the engine 110 can maintain energy in the efficient operating range, and the power battery 410 can provide additional energy. The engine 110 and the power battery 410 jointly provide energy to meet the high power demand of the electric wheel 310, which not only avoids the power shortage that may be caused by the engine 110 providing energy alone, but also avoids excessive pollutant emissions caused by the engine 110 burning a large amount of energy to meet the high power.

[0032] Therefore, the electric drive system of the electric wheel mining dump truck of the present application is newly provided with a power battery 410, a bidirectional DC / DC module 420 and an auxiliary system 430. The power battery 410 can be used as a supplementary and auxiliary power source, and the engine fuel-power battery hybrid power energy management control can be adopted, so that the engine 110 can be maintained in an efficient operating range, which can improve energy utilization, realize energy recovery, and reduce pollutant emissions.

[0033] In one embodiment, the electric drive system of the electric wheel mining dump truck further includes an electric control braking system 500, which includes a chopper 510 and a braking resistor 520, wherein the input end of the chopper 510 is connected to the first end of the inverter 220, and the output end of the chopper 510 is connected to the braking resistor 520. When braking, if the power battery 410 is fully charged or the braking feedback energy is too large, the electric control braking system 500 needs to consume energy, which can be converted into direct current through the chopper 510, and the electric energy is consumed as heat energy through the braking resistor 520, thereby effectively controlling the energy input to the electric wheel 310 and the energy when the power battery 410 is charged.

[0034] In one embodiment, the bidirectional DC / DC module 420 includes a first conversion circuit, a second conversion circuit, and a third conversion circuit. The first conversion circuit is connected to the first end and the second end of the bidirectional DC / DC module 420, respectively. The second conversion circuit is connected to the second end and the third end of the bidirectional DC / DC module 420, respectively. The third conversion circuit is connected to the first end and the third end of the bidirectional DC / DC module 420, respectively. The first conversion circuit can realize energy conversion between the power battery 410 and the rectifier inverter system 200, that is, the power battery 410 can output battery energy to the rectifier inverter system 200 through the first conversion circuit, which can be used to supplement power when the electric wheel 310 has a high power demand. The rectifier inverter system 200 can charge the power battery 410 through the first conversion circuit, which can be used for the engine 110 to provide energy to the power battery 410, and the electric wheel 310 to feed back energy to charge the power battery 410. The second conversion circuit can realize that the power battery 410 provides energy to the auxiliary system 430, that is, the power battery 410 can output battery energy to the auxiliary system 430 through the second conversion circuit, so that the auxiliary system 430 can work normally. The third conversion circuit can enable the rectifier inverter system 200 to provide energy to the auxiliary system 430, and can be used for the engine 110 to provide energy to the auxiliary system 430, and the electric wheel 310 to feed back energy to the auxiliary system 430, so as to prevent the auxiliary system 430 from stopping working due to the power battery 410 being unable to provide energy due to an accident.

[0035] In one embodiment, the auxiliary system 430 includes a bidirectional controller, and the third end of the bidirectional DC / DC module 420 provides power to the bidirectional controller. The bidirectional controller is used to control the working state of the bidirectional DC / DC module 420, and can be used to control the opening and closing timing of the power semiconductors in the bidirectional DC / DC module 420 to achieve voltage rise and fall and energy transfer. It can also be used for switching the power battery 410 for charging or discharging, and can also be used for protection control such as overcurrent protection, overvoltage protection and short circuit protection, and can communicate data with other system modules.

[0036] In one embodiment, the auxiliary system 430 includes a heat sink, and the third terminal of the bidirectional DC / DC module 420 provides power to the heat sink, and the heat sink is used to dissipate heat from the bidirectional DC / DC module 420. In other embodiments, the heat sink can be used to dissipate heat from devices such as the power battery 410 or the inverter 220. The heat dissipation of the heat sink can avoid performance degradation or failure caused by excessive internal temperature.

[0037] In one embodiment, the engine 110 may be a diesel engine, a gasoline engine, or an engine powered by natural gas or other fuels, which is not limited in the present application.

[0038] In one embodiment, the power battery 410 may be a lithium-ion battery. The lithium-ion battery has a small mass and good performance, and can improve the driving performance of the mining dump truck.

[0039] Second embodiment See also Figure 3 , Figure 3 This is a flow chart of an energy management control method for an electric drive system of an electric wheeled mining dump truck in the second embodiment of the present application. This embodiment provides an energy management control method for an electric drive system of an electric wheeled mining dump truck, comprising: Step S1: If the vehicle strong electric excitation is effective, determine whether the parking brake is effective; if the parking brake is effective, perform parking brake energy management; if the parking brake is invalid, determine whether the SOC of the power battery 410 is lower than the lower limit; In one embodiment, the parking brake energy management includes: controlling the bidirectional DC / DC module 420 to operate and the power battery 410 to charge, so as to store the energy output by the engine 110 in the power battery 410 .

[0040] Specifically, if the strong electric excitation of the whole vehicle is effective, the power system 100 can provide energy normally, and then judge whether the parking brake is effective, that is, whether the parking brake signal is detected, and judge whether to enter the parking brake energy management under the parking brake condition. If the parking brake signal is detected, the SOC of the power battery 410 can be detected. The parking brake energy management may include controlling the operation of the bidirectional DC / DC module 420 and the charging of the power battery 410 if the parking brake signal is detected, and storing the energy output by the engine 110 in the power battery 410. Therefore, under the working conditions such as parking brake, the engine 110 can be maintained in the efficient operation range, and the energy provided by the engine 110 can be stored in the power battery 410, so as to improve the energy utilization rate and reduce the emission of pollutants caused by the unstable combustion of the engine 110.

[0041] In one embodiment, before the vehicle strong electric excitation is effective, it also includes: after the vehicle is started, it is determined whether the vehicle strong electric excitation signal is effective, and if not, a fault is reported. Specifically, after the vehicle is started, if the vehicle strong electric excitation is invalid, the power system 100 and the like are abnormal and cannot provide energy normally, and a fault needs to be reported for fault processing.

[0042] Step S2: If the SOC of the power battery 410 is lower than the lower limit, compulsory charging energy management is performed; if the SOC of the power battery 410 is not lower than the lower limit, it is determined whether the vehicle is in a braking condition; In one embodiment, forced charging energy management includes: controlling the operation of the bidirectional DC / DC module 420 and the charging of the power battery 410 , sending a portion of the energy output by the engine 110 to the electric wheel 310 , and storing another portion of the energy output by the engine 110 in the power battery 410 .

[0043] Specifically, the SOC of the power battery 410 is monitored. If the SOC of the power battery 410 is lower than the lower limit, it means that the energy of the auxiliary power of the power battery 410 is insufficient, and forced charging energy management is required. If the SOC of the power battery 410 is not lower than the lower limit, it can be determined whether to enter the braking state. Forced charging energy management may include controlling the operation of the bidirectional DC / DC module 420 and the charging of the power battery 410, sending a part of the energy output by the engine 110 to the electric wheel 310, and storing another part of the energy output by the engine 110 in the power battery 410. The charging power of the power battery 410 can be adjusted accordingly according to the speed of the engine 110. Thus, the power battery 410 can be forcedly charged through forced charging energy management; in particular, it can be determined whether to perform forced charging energy management according to the SOC of the power battery 410 to ensure that the power battery 410 has reserved energy available at any time.

[0044] Step S3: If the vehicle is in a braking condition, then perform braking condition energy management; if the vehicle is not in a braking condition, determine whether the power required by the electric wheel 310 is less than the output power of the engine 110; In one embodiment, the braking condition energy management includes: controlling the operation of the bidirectional DC / DC module 420 and the charging of the power battery 410 , and storing the energy fed back by the electric wheel 310 in the power battery 410 .

[0045] Specifically, if a brake pedal signal is detected, it is determined to perform braking condition energy management, and if no brake pedal signal is detected, a determination can be made between the power required by the electric wheel 310 and the power of the engine 110. Braking condition energy management may include controlling the operation of the bidirectional DC / DC module 420 and the charging of the power battery 410, and storing the energy fed back by the electric wheel 310 in the power battery 410. Thus, in braking conditions such as deceleration and downhill, the energy fed back by the electric wheel 310 can be stored in the power battery 410, which can achieve energy recovery and improve energy utilization.

[0046] Step S4: If the power required by the electric wheel 310 is less than the output power of the engine 110, the bidirectional DC / DC module 420 is in standby mode; if the power required by the electric wheel 310 is not less than the output power of the engine 110, traction condition energy management is performed.

[0047] In one embodiment, the traction condition energy management includes: controlling the operation of the bidirectional DC / DC module 420 and the discharge of the power battery 410 , and sending the energy of the power battery 410 to the electric wheels 310 to supplement the power.

[0048] Specifically, when the power demanded by the electric wheel 310 is less than the output power of the engine 110, only the engine 110 needs to provide energy alone, and the power battery 410 does not need to provide energy, and the bidirectional DC / DC module 420 is on standby. Thus, the engine 110 can be kept in an efficient operating range and provide energy to the electric wheel 310 alone, which can improve energy utilization, achieve energy recovery, and reduce pollutant emissions. When the power demanded by the electric wheel 310 is greater than the output power of the engine 110, the traction condition energy management is entered, and the bidirectional DC / DC module 420 can be controlled to work and the power battery 410 can be discharged, and the energy of the power battery 410 is sent to the electric wheel 310 to supplement the power. Thus, in traction conditions such as going uphill and accelerating, the engine 110 can maintain providing energy in an efficient operating range, while the power battery 410 can provide additional energy. The engine 110 and the power battery 410 jointly provide energy to meet the high power requirements of the electric wheel 310, which not only avoids the power shortage that may be caused by the engine 110 providing energy alone, but also avoids excessive pollutant emissions caused by the engine 110 performing large-scale combustion to meet the high power.

[0049] In summary, the electric transmission system of the electric wheel mining dump truck in the above example has the following beneficial effects: the electric transmission system and energy management control method of the electric wheel mining dump truck provided in the embodiment of the present application are newly provided with a power battery 410, a bidirectional DC / DC module 420 and an auxiliary system 430. The power battery 410 can be used as a supplementary and auxiliary power source, and the engine fuel-power battery hybrid power energy management control can be adopted, so that the engine 110 can be maintained in an efficient operating range, which can improve energy utilization, realize energy recovery, and reduce pollutant emissions.

[0050] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0052] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An electric drive system for an electric wheel mining dump truck, characterized in that: It includes a power system (100), a rectifier and inverter system (200) and a drive system (300), and also includes a power battery (410), a bidirectional DC / DC module (420) and an auxiliary system (430); The power system (100) comprises an engine (110) and an AC generator (120), wherein an output end of the engine (110) is connected to an input end of the AC generator (120); The rectifier-inverter system (200) comprises a rectifier (210) and an inverter (220), wherein an input end of the rectifier (210) is connected to an output end of the AC generator (120), and an output end of the rectifier (210) is connected to a first end of the inverter (220); The driving system (300) comprises an electric wheel (310), and the electric wheel (310) is bidirectionally electrically connected to the second end of the inverter (220); A first end of the bidirectional DC / DC module (420) is bidirectionally electrically connected to a first end of the inverter (220), a second end of the bidirectional DC / DC module (420) is bidirectionally electrically connected to the power battery (410), and a third end of the bidirectional DC / DC module (420) is connected to the auxiliary system (430).

2. The electric drive system of the electric wheel mining dump truck according to claim 1 is characterized in that: The invention also includes an electric control braking system (500), wherein the electric control braking system (500) includes a chopper (510) and a braking resistor (520), wherein an input end of the chopper (510) is connected to a first end of the inverter (220), and an output end of the chopper (510) is connected to the braking resistor (520).

3. The electric drive system of the electric wheel mining dump truck according to claim 1 is characterized in that: The bidirectional DC / DC module (420) comprises a first conversion circuit, a second conversion circuit and a third conversion circuit, wherein the first conversion circuit is respectively connected to a first end and a second end of the bidirectional DC / DC module (420), the second conversion circuit is respectively connected to a second end and a third end of the bidirectional DC / DC module (420), and the third conversion circuit is respectively connected to a first end and a third end of the bidirectional DC / DC module (420).

4. The electric drive system of the electric wheel mining dump truck according to claim 1 is characterized in that: The auxiliary system (430) comprises a bidirectional controller, a third end of the bidirectional DC / DC module (420) provides power to the bidirectional controller, and the bidirectional controller is used to control the working state of the bidirectional DC / DC module (420).

5. The electric drive system of the electric wheel mining dump truck according to claim 1, characterized in that: The auxiliary system (430) comprises a heat sink, and a third end of the bidirectional DC / DC module (420) provides power to the heat sink, and the heat sink is used for heat dissipation of the bidirectional DC / DC module (420).

6. An energy management control method for an electric drive system of an electric wheel mining dump truck, characterized in that: Used to drive the electric drive system of the electric wheel mining dump truck according to any one of claims 1 to 5, the energy management control method comprises: If the strong electric excitation of the whole vehicle is effective, then determining whether the parking brake is effective; if the parking brake is effective, then performing parking brake energy management; if the parking brake is ineffective, then determining whether the SOC of the power battery (410) is lower than a lower limit value; If the SOC of the power battery (410) is lower than a lower limit value, compulsory charging energy management is performed; if the SOC of the power battery (410) is not lower than the lower limit value, it is determined whether the vehicle is in a braking condition; If the vehicle is in a braking condition, braking condition energy management is performed; if the vehicle is not in a braking condition, it is determined whether the power required by the electric wheel (310) is less than the output power of the engine (110); If the power required by the electric wheel (310) is less than the output power of the engine (110), the bidirectional DC / DC module (420) is in standby mode; if the power required by the electric wheel (310) is not less than the output power of the engine (110), traction condition energy management is performed.

7. The energy management control method according to claim 6, characterized in that: The parking brake energy management includes: The bidirectional DC / DC module (420) is controlled to operate and the power battery (410) is charged, so that the energy output by the engine (110) is stored in the power battery (410).

8. The energy management control method according to claim 6, characterized in that: The mandatory charging energy management includes: The bidirectional DC / DC module (420) is controlled to operate and the power battery (410) is charged, a portion of the energy output by the engine (110) is sent to the electric wheel (310), and another portion of the energy output by the engine (110) is stored in the power battery (410).

9. The energy management control method according to claim 6, characterized in that: The braking condition energy management includes: The bidirectional DC / DC module (420) is controlled to operate and the power battery (410) is charged, so that the energy fed back by the electric wheel (310) is stored in the power battery (410).

10. The energy management control method according to claim 6, characterized in that: The traction condition energy management includes: The bidirectional DC / DC module (420) is controlled to operate and the power battery (410) to discharge, and the energy of the power battery (410) is sent to the electric wheel (310) to supplement power.

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