Multi-source hybrid drive system and vehicle

Abstract

The present invention provides a multi-source hybrid power drive system and vehicle, which includes a fuel generator set, a hydrogen fuel engine, a wire network power input device, a power battery and a traction converter; the fuel generator set is connected to the DC bus through a first rectifier; the power output end of the hydrogen fuel engine is connected to the DC bus through a first DC / DC device; the wire network power input device is connected to the overhead contact network through a pantograph, and the output end of the wire network power input device is connected to the DC bus; the output end of the power battery is connected to the DC bus; the DC bus is connected to the input end of the power battery through a second DC / DC device; and the DC bus is connected to the load through an inverter. A variety of different forms of power are mixed and matched, and different power units are converted into DC power supply through different power change devices, so that the drive system can adjust the power output in real time according to the road conditions and working environment, can better adapt to different complex road conditions, and effectively reduce energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid vehicles, and in particular to a multi-source hybrid driving system and a vehicle. Background Art

[0002] The application scenarios of large vehicles and large construction machinery are generally closed and fixed scenarios such as ports, mines, and construction sites. The daily operating conditions and road conditions are relatively fixed, and they are generally cyclic operation modes. The above-mentioned vehicles generally have large loads and are used in harsh environments, such as ice, snow, mud, and slippery roads. At the same time, large vehicles and large construction machinery currently mostly use electric drive systems with a single power source. Electric drive systems with a single power source have poor adaptability to different complex environments due to their relatively single power source. For complex road conditions, there is a possibility that the driving power cannot be met, and the power input cannot be adjusted according to the environment, resulting in high energy consumption.

[0003] In order to adapt to different complex environments and working conditions, large engineering vehicles currently use hybrid power for driving. Hybrid power uses fuel engines and hydrogen fuel engines as power sources. Fuel engines and hydrogen fuel engines can directly drive wheels, or drive generators to generate electricity, and drive motors through electricity to drive wheels. In some large engineering vehicles, the power input sources of hybrid power include not only fuel engines and hydrogen fuel engines, but also power batteries and overhead wire networks. In this way, various power input sources are connected to the DC bus, which will cause more pulse currents, harmonic voltages, and voltage fluctuations, which is not conducive to the stable operation of the hybrid power system. Summary of the invention

[0004] Based on this, it is necessary to provide a multi-source hybrid drive system and vehicle to address the above technical issues.

[0005] A multi-source hybrid power drive system, comprising: a fuel generator set, a hydrogen fuel engine, a wireline network power input device, a power battery, a traction converter and a control module;

[0006] The traction converter includes a first rectifier, a first DC / DC device, a second DC / DC device, an inverter and a DC bus, and the control module is connected to the first rectifier, the first DC / DC device, the second DC / DC device and the inverter respectively;

[0007] The power output end of the fuel generator set is connected to the input end of the first rectifier, and the output end of the first rectifier is connected to the DC bus;

[0008] The electric energy output end of the hydrogen fuel engine is connected to the input end of the first DC / DC device, and the output end of the first DC / DC device is connected to the DC bus;

[0009] The input end of the overhead wire network power input device has a pantograph, and the pantograph is used to connect to the overhead wire network. The output end of the overhead wire network power input device is connected to the DC bus.

[0010] The output end of the power battery is connected to the DC bus;

[0011] The input end of the second DC / DC device is connected to the DC bus, and the output end of the second DC / DC device is connected to the input end of the power battery;

[0012] The input end of the inverter is connected to the DC bus, and the output end of the inverter is used to be connected to a load;

[0013] The control module is used to control the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device to output voltage according to a preset given voltage value, and when the actual voltage values ​​of the output voltages of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device are not within a preset fluctuation range of the preset given voltage value, and the actual voltage values ​​are less than the preset given voltage value, the preset given voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device are increased;

[0014] When the actual voltage value is greater than the preset given voltage value, reducing the preset given voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device;

[0015] By continuously adjusting the preset given voltage value in multiple cycles, voltage fluctuations can be reduced.

[0016] In one of the embodiments, the greater the magnitude of the actual voltage value being less than the preset given voltage value, the greater the magnitude of the increase in the preset given voltage value; the greater the magnitude of the actual voltage value being greater than the preset given voltage value, the greater the magnitude of the decrease in the preset given voltage value.

[0017] In one embodiment, the control module is used to adjust the preset given voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device according to the voltage deviation value when the voltage deviation value outputted by the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device is greater than the preset deviation value, wherein the voltage deviation value is the difference between the largest and the smallest of the output voltages of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device.

[0018] In one of the embodiments, the control module is used to obtain the increase amplitude and decrease amplitude corresponding to the voltage deviation value in the relationship between the preset voltage deviation value and the adjustment amplitude, and adjust the preset given voltage value when the voltage deviation value outputted by the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device is greater than the preset deviation value.

[0019] In one embodiment, the overhead line network electric energy input device includes a voltage conversion device, and the voltage conversion device includes an overhead line network converter and an overhead line network transformer. The input end of the overhead line network converter is connected to the pantograph, the output end of the overhead line network converter is connected to the input end of the overhead line network transformer, and the output end of the overhead line network transformer is connected to the DC bus.

[0020] In one embodiment, the control module is connected to the fuel generator set, the hydrogen fuel engine, the overhead wire network power input device, the power battery and the traction converter respectively;

[0021] The control module is used to obtain road parameters and vehicle parameters, calculate a single operation energy consumption according to the road parameters and the vehicle parameters, and control the fuel generator set, the hydrogen fuel engine, the overhead wire network power input device and the power battery to supply power to the load according to the operation energy consumption.

[0022] In one embodiment, the control module is used to obtain the output energy of the fuel generator set and the hydrogen fuel engine in a single operation. When the output energy of the fuel generator set and the hydrogen fuel engine in a single operation is greater than or equal to the energy consumption of the single operation, the fuel generator set and the hydrogen fuel engine are controlled to supply power to the load, and the overhead wire network power input device and the power battery are controlled to stop supplying power to the load.

[0023] A multi-source hybrid vehicle comprises the multi-source hybrid drive system described in any one of the above embodiments and a load, wherein the load comprises a traction motor.

[0024] In one embodiment, the fuel generator set includes a fuel engine and a first generator, the power output end of the fuel engine is connected to the power input end of the first generator, and the power output end of the first generator is connected to the input end of the first rectifier.

[0025] In the above-mentioned multi-source hybrid drive system and vehicle, when the actual voltage values ​​at the output end of the first rectifier, the output end of the first DC / DC device and the output end of the second DC / DC device are not within the preset fluctuation range of the preset given voltage value, it indicates that there is a large fluctuation and the actual voltage value deviates from the preset given voltage value by a large amount. Therefore, the preset given voltage value is adjusted. By continuously adjusting the preset given voltage value in multiple cycles, the fluctuation is reduced, thereby effectively reducing the impact of pulse current and harmonic voltage, and reducing voltage fluctuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a process flow of a multi-source hybrid power driving system in one embodiment;

[0027] Figure 2 It is a schematic diagram of flat road conditions, uphill road conditions, and downhill road conditions in a road condition model of a vehicle of a multi-source hybrid power driving system in an embodiment. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. 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.

[0029] Embodiment 1

[0030] In this embodiment, Figure 1As shown, a multi-source hybrid power drive system is provided, which includes: a fuel generator set 110, a hydrogen fuel engine 120, a wire network power input device 130, a power battery 140, a traction converter 200 and a control module; the traction converter 200 includes a first rectifier 210, a first DC / DC device 220, a second DC / DC device 230, an inverter 240 and a DC bus 250, and the control module is respectively connected to the first rectifier, the first DC / DC device, the second DC / DC device and the inverter; the power output end of the fuel generator set 110 is connected to the input end of the first rectifier 210, and the output end of the first rectifier 210 is connected to the DC bus 250; the power output end of the hydrogen fuel engine 120 is connected to the DC bus 250; The output end of the power input device 130 is connected to the input end of the first DC / DC device 220, and the output end of the first DC / DC device 220 is connected to the DC bus 250; the input end of the overhead line network power input device 130 has a pantograph, and the pantograph is used to be connected to the contact network, and the output end of the overhead line network power input device 130 is connected to the DC bus 250; the output end of the power battery 140 is connected to the DC bus 250; the input end of the second DC / DC device 230 is connected to the DC bus 250, and the output end of the second DC / DC device 230 is connected to the input end of the power battery 140; the input end of the inverter 240 is connected to the DC bus 250, and the output end of the inverter 240 is used to be connected to a load.

[0031] The control module is used to control the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device to output voltage according to a preset given voltage value. When the actual voltage value of the output voltage of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device is not within the preset fluctuation range of the preset given voltage value, the preset given voltage value of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device is adjusted according to the actual voltage value. In this embodiment, the first DC / DC device 220 and the second DC / DC device 230 are respectively used for DC transformation to convert the input voltage into a voltage suitable for the DC bus. Both the fuel engine 110 and the hydrogen engine 120 can provide power for the vehicle and generate electricity during the working process. The alternating current generated by the fuel engine 110 is rectified by the first rectifier 210, converted into direct current, and transmitted to the DC bus 250; the direct current generated by the hydrogen engine 120 is transformed by the first DC / DC device 220, converted into a DC voltage adapted to the DC bus 250, and transmitted to the DC bus 250.

[0032] The overhead line network power input device 130 is connected to the overhead line via a pantograph, receives power from the overhead line, and transmits the power to the DC bus 250 .

[0033] The output end of the power battery 140 is connected to the DC bus 250 through the third transformer, and the input end of the power battery 140 is connected to the DC bus 250 through the second DC / DC device 230. In this way, when the power and electric energy provided by the fuel generator set 110 and the hydrogen fuel engine 120 are insufficient, the power battery 140 can output electric energy to the DC bus 250 to supply power to the load. When the fuel generator set 110 and the hydrogen fuel engine 120 generate more electric energy, the electric energy generated by the fuel generator set 110 and the hydrogen fuel engine 120 can also charge the power battery 140 through the DC bus 250.

[0034] The inverter 240 is used to obtain electric energy from the DC bus 250, and invert the DC power of the DC bus 250 into three-phase AC power with adjustable voltage amplitude and frequency to supply the load. In one embodiment, the load is a traction motor. In this embodiment, the inverter 240 is used to obtain electric energy from the DC bus 250, and invert the DC power of the DC bus 250 into three-phase AC power with adjustable voltage amplitude and frequency to drive the load traction motor, and the traction motor drives the driving wheels of the vehicle to rotate, thereby driving the vehicle to move. In some other embodiments, the load also includes a cooling fan and a water pump.

[0035] In the present embodiment, a variety of different forms of power, such as a fuel-fired generator set 110, a hydrogen fuel engine 120, a cable network power input device 130, and a power battery 140, are mixed and matched. Different power units are converted into DC power supply through different power conversion devices. Different power units use a common DC bus 250 to power the load, so that the drive system can adjust the power output and input in real time according to the road conditions and working environment, can better adapt to different complex road conditions, and effectively reduce energy consumption.

[0036] It should be understood that the voltage and current output by the matrix-type rectifier unit and the DC / DC unit are connected in series and in parallel, which will cause more pulse currents and harmonic voltages and voltage fluctuations. In this embodiment, the output end of the first rectifier, the output end of the first DC / DC device and the output end of the second DC / DC device are controlled by the control module to output voltage according to the preset given voltage value. When the actual voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device and the output end of the second DC / DC device are not within the preset fluctuation range of the preset given voltage value, it indicates that there is a large fluctuation, and the actual voltage value deviates from the preset given voltage value by a large amount. Therefore, the preset given voltage value is adjusted. By continuously adjusting the preset given voltage value in multiple cycles, the fluctuation is reduced, thereby effectively reducing the impact of the pulse current and harmonic voltage, and reducing the voltage fluctuation.

[0037] In one embodiment, the control module is used to increase the preset given voltage value of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device when the actual voltage value of the output voltage of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device is not within the preset fluctuation range of the preset given voltage value, and the actual voltage value is less than the preset given voltage value;

[0038] When the actual voltage values ​​of the output voltages at the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device are not within the preset fluctuation range of the preset given voltage value, and the actual voltage values ​​are greater than the preset given voltage value, the preset given voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device are reduced.

[0039] In this embodiment, an idea for adjusting the preset given voltage value is provided. Specifically, when the actual voltage value is not within the preset fluctuation range of the preset given voltage value, it indicates that the fluctuation is large. At this time, the preset given voltage value needs to be adjusted according to the size relationship between the actual voltage value and the preset given voltage value. When the actual voltage value is less than the preset given voltage value, the preset given voltage value is increased. When the actual voltage value is greater than the preset given voltage value, the preset given voltage value is reduced. In this way, by increasing the preset given voltage value to increase the actual voltage value, or reducing the preset given voltage value to reduce the actual voltage value, the difference between the actual voltage value and the preset given voltage value is reduced, thereby reducing the fluctuation.

[0040] In one embodiment, the greater the amplitude by which the actual voltage value is less than the preset given voltage value, the greater the amplitude by which the preset given voltage value is increased; the greater the amplitude by which the actual voltage value is greater than the preset given voltage value, the greater the amplitude by which the preset given voltage value is decreased.

[0041] In this embodiment, the greater the absolute value of the difference between the actual voltage value and the preset given voltage value, the greater the amplitude of adjustment of the preset given voltage value. In this way, the difference between the actual voltage value and the preset given voltage value can be further reduced, thereby reducing fluctuations.

[0042] In one embodiment, the control module is used to adjust the preset given voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device according to the voltage deviation value when the voltage deviation value outputted by the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device is greater than the preset deviation value, wherein the voltage deviation value is the difference between the largest and the smallest of the output voltages of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device.

[0043] In this embodiment, the voltage deviation value reflects the fluctuation of the output voltage of each unit. The preset given voltage value is adjusted based on the difference between the maximum voltage value and the minimum voltage value output by each unit. In this way, the preset given voltage value can be adjusted gradually according to the difference, thereby reducing the fluctuation of the output voltage of each unit.

[0044] In one embodiment, the control module is used to obtain an increase amplitude and a decrease amplitude corresponding to the voltage deviation value in a relationship between a preset voltage deviation value and an adjustment amplitude, and adjust the preset given voltage value when the voltage deviation value outputted by the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device is greater than a preset deviation value.

[0045] In this embodiment, the increase or decrease amplitude corresponding to different voltage deviation values ​​is recorded in the relationship between the preset bias value and the adjustment amplitude. In this way, when the output voltage deviation value of each unit is greater than the preset bias value, it indicates that the deviation is large and the output voltage fluctuates greatly, and the preset given voltage value needs to be adjusted. At this time, the database is read to obtain the increase or decrease amplitude corresponding to the voltage deviation value in the relationship between the preset bias value and the adjustment amplitude, and the preset given voltage value is adjusted according to the increase or decrease amplitude, so that the preset given voltage value can be accurately adjusted, thereby achieving accurate regulation of voltage fluctuations.

[0046] Specifically, if the actual output voltage of the voltage output by the multi-unit rectifier unit and DC / DC unit is U 1 ~U N (actual voltage), given the voltage of each control unit is (Preset given voltage value), if there is a difference between the given voltage and the actual voltage, each unit in each control cycle is given an increased voltage according to the following method , to ensure the output voltage consistency between different units:

[0047]

[0048] For example, when the actual voltage U N With the preset given voltage value U D The difference between them is less than the preset given voltage value U D 10% and the actual voltage U N Less than the preset voltage value U D , then according to the preset voltage value U D The preset voltage value U is increased by 10% D When the actual voltage U N With the preset given voltage value U D The difference between them is less than the preset given voltage value U D 30% and the actual voltage U N Greater than the preset voltage value U D , then according to the preset voltage value U D The preset voltage value U is reduced by 30% D Therefore, when the absolute value of the difference between the actual voltage value and the preset given voltage value is larger, the amplitude of adjustment of the preset given voltage value is larger, and when the absolute value of the difference between the actual voltage value and the preset given voltage value is smaller, the amplitude of adjustment of the preset given voltage value is smaller, so that the difference between the actual voltage value and the preset given voltage value can be further reduced, thereby reducing fluctuations.

[0049] In one embodiment, the fuel engine unit includes a fuel engine and a first generator, the power output end of the fuel engine is connected to the power input end of the first generator, and the power output end of the first generator is connected to the input end of the first rectifier. In one embodiment, the power output end of the fuel engine is also used to connect to the drive wheel.

[0050] In this embodiment, the fuel engine uses fuel as fuel to perform work, and the fuel includes diesel and / or gasoline. The fuel engine performs work on the first generator, so that the first generator performs work to generate electrical energy. The alternating current generated by the first generator is converted into direct current through a first rectifier and transmitted to the DC bus to power the load or charge the power battery.

[0051] In one embodiment, the fuel generator set includes a diesel generator set and / or a gasoline generator set. In this embodiment, the fuel includes diesel and gasoline, the fuel generator set includes at least one diesel generator set and at least one gasoline generator set, the first generator includes a second generator and a third generator, and the first rectifier includes a second rectifier and a third rectifier, wherein the diesel generator set includes a diesel engine and a second generator, the power output end of the diesel engine is connected to the power input end of the second generator, the electric energy output end of the second generator is connected to the input end of the second rectifier, and the power output end of the diesel engine is also used to connect to the drive wheel; the gasoline generator set includes a gasoline engine and a third generator, the power output end of the gasoline engine is connected to the power input end of the third generator, the electric energy output end of the third generator is connected to the input end of the third rectifier, and the power output end of the gasoline engine is also used to connect to the drive wheel.

[0052] In this embodiment, both the diesel engine and the gasoline engine can provide electricity for the drive wheels. For example, the diesel engine and the gasoline engine are respectively connected to the drive wheels through a gearbox. In this way, the diesel engine and the gasoline engine can provide power for the drive wheels when doing work. In addition, the diesel engine and the gasoline engine can also work on the second generator and the third generator respectively, so that the second generator and the third generator generate electricity. The generated electric energy is converted into direct current through the second rectifier and the third rectifier, and transmitted to the DC bus to power the load or charge the power battery.

[0053] In one embodiment, the number of the fuel engine units is multiple. In this embodiment, multiple fuel engine units can be set to increase the total driving power, and some or all of the fuel engine units can be turned on according to the road conditions, thereby improving driving flexibility and improving fuel utilization.

[0054] In one of the embodiments, the overhead line network electric energy input device comprises a voltage transformer and a current transformer, the input end of the voltage transformer and the current transformer is connected to the pantograph, and the output end of the voltage transformer and the current transformer is connected to the DC bus.

[0055] In this embodiment, the overhead line network power input device transforms the voltage and current of the overhead line network (contact network) through the voltage and current conversion device to adapt to the input voltage and current of the DC bus.

[0056] In one embodiment, the voltage conversion and current conversion device includes a cable network converter and a cable network transformer, the input end of the cable network converter is connected to the pantograph, the output end of the cable network converter is connected to the input end of the cable network transformer, and the output end of the cable network transformer is connected to the DC bus.

[0057] In this embodiment, the overhead line network converter and the overhead line network transformer are used to transform the electric energy provided by the overhead line network so that the electric energy meets the electric energy demand of the DC bus. In this embodiment, the overhead line network is a contact network, which is used to provide overhead cables, and the overhead cables provide electric energy. The pantograph is connected to the contact network, and the pantograph receives the electric energy from the contact network and transmits it to the DC bus to supply power to the load or charge the power battery.

[0058] In some complex working conditions, when diesel and gasoline are insufficient, or when the diesel engine and gasoline engine provide insufficient power, the overhead wire network power input device can be used as a power supplement to provide supplementary power for the power battery and the load. In other words, in some working conditions or on some roads where overhead wire networks are not set up, the pantograph can be disconnected from the overhead wire network, that is, the pantograph can be disassembled, making the vehicle's driving more flexible and not limited by the scope of the overhead wire network (overhead wire network).

[0059] In one embodiment, the control module is respectively connected to the fuel generator set, the hydrogen fuel engine, the overhead wire network power input device, the power battery and the traction converter;

[0060] The control module is used to obtain road parameters and vehicle parameters, calculate a single operation energy consumption according to the road parameters and the vehicle parameters, and control the fuel generator set, the hydrogen fuel engine, the overhead wire network power input device and the power battery to supply power to the load according to the operation energy consumption.

[0061] In this embodiment, the control module is used to control each power unit to output electric energy to the DC bus to adapt to the road conditions, so that the output of electric energy can adapt to the road conditions, which plays a role in saving energy consumption. Specifically, the traction power of the rear wheel traction motor is related to the weight of the vehicle and the slope of the road. The application scenarios of large vehicles, heavy vehicles, large engineering machinery, etc. are generally closed and fixed scenarios such as ports, mines, and construction sites. The daily operating conditions and road conditions are relatively fixed, and are generally cyclic operation modes, such as Figure 2 As shown, the road condition model of the above vehicle mainly includes three road conditions: flat road condition, uphill road condition and downhill road condition. A completed operation cycle mainly includes: A flat road condition, Uphill conditions, The energy consumed by the vehicle during one operation cycle is the energy consumption of a single operation. The calculation is as follows:

[0062] ;

[0063] in, The electric drive efficiency of the vehicle; is the rolling resistance coefficient; is the air resistance coefficient; is the vehicle mass, g is the gravity coefficient (gravitational acceleration), is the frontal area of ​​the vehicle, θ is the uphill ramp angle, is the downhill slope angle, S is the flat road distance, is the uphill distance, is the downhill distance, is the flat road speed, is the uphill speed, The electric drive efficiency, rolling resistance coefficient, vehicle mass and windward area are vehicle parameters, and the ramp angle, flat road distance, uphill road distance and downhill road distance are road parameters. According to the above parameters, the energy consumption of a single operation can be calculated. The control module controls the fuel generator set, the hydrogen fuel engine, the overhead wire network power input device and the power battery to supply power to the load according to the energy consumption of the single operation, so as to meet the minimum power requirement of the energy consumption of a single operation, thereby saving energy consumption, and improving the driving efficiency on the basis of reducing energy consumption, thereby improving the operation efficiency.

[0064] In one embodiment, the control module is used to obtain the output energy of the fuel generator set and the hydrogen fuel engine in a single operation. When the output energy of the fuel generator set and the hydrogen fuel engine in a single operation is greater than or equal to the energy consumption of the single operation, the fuel generator set and the hydrogen fuel engine are controlled to supply power to the load, and the overhead wire network power input device and the power battery are controlled to stop supplying power to the load.

[0065] In this embodiment, the diesel engine power and battery output change as the diesel engine speed increases, where the diesel engine output power is The power battery system has stable voltage and power output characteristics. The power battery output power is , the output power and voltage response of the hydrogen fuel engine are slow, and the output power of the hydrogen fuel engine is , the power provided by the overhead power supply network is The total power provided by the multi-power source system is : + ;

[0066] The output energy in a single operation is the total energy provided for a single road cycle, which is: = + x( );

[0067] Large-scale construction machinery and vehicles operate according to the above road conditions every day, and cycle N working conditions every day. The control module of the multi-source hybrid drive system monitors the power output and load power of each power source in real time, and the real-time control system controls the power in each road condition cycle as follows:

[0068] - x( ));

[0069] From the above formula, we can know that the output energy of the multi-power source system in a single operation is Greater than the energy consumption of a vehicle in a single operation , and the output energy in a single operation Energy consumption of a vehicle in a single operation The difference is equal to the sum of the energy output by the power battery and the energy provided by the overhead power grid. In this way, the control system is based on the single power Output can ensure that in a single operating condition, only the fuel generator set and the hydrogen fuel engine supply power to the traction electrodes, and the battery system and the wiring system do not provide energy to maintain the SOC stability of the battery system.

[0070] - x( )) / N;

[0071] From the above formula, we can know that the output energy of the multi-power source system in a single operation is Greater than the energy consumption of a vehicle in a single operation , and the control system is based on single power Output. It can ensure N operating conditions a day, with only the fuel generator set and hydrogen fuel engine supplying power to the traction electrodes, and the battery system and the wiring system not providing energy to maintain the SOC stability of the battery system.

[0072] In one embodiment, the control module is used to obtain the output energy of the fuel generator set and the hydrogen fuel engine in a single operation. When the output energy of the fuel generator set and the hydrogen fuel engine in a single operation is greater than or equal to the energy consumption of the single operation, the power output curve is obtained, and the fuel generator set and the hydrogen fuel engine are controlled to operate according to the power output curve to supply power to the load, and the overhead wire network power input device and the power battery are controlled to stop supplying power to the load.

[0073] In this embodiment, the power output curve is a power characteristic curve that matches the road conditions of the operation, which is used to characterize the power output of the fuel engine and the hydrogen fuel engine. The power output curve can match different road conditions during the operation, for example, different powers are output in downhill sections, uphill sections, and flat sections. For example, in downhill sections, the output power is different due to different slope angles. Therefore, by obtaining the power output curve, the fuel engine and the hydrogen fuel engine can output power that matches the road conditions of the operation, thereby improving driving efficiency and reducing energy consumption.

[0074] In order to match the power output curve of the working road condition, in one embodiment, sample road parameters and sample vehicle parameters are obtained; the road condition energy consumption corresponding to the sample road parameters and the sample vehicle parameters on the preset road condition is obtained, and the correlation between the sample road parameters and the sample vehicle parameters and the road condition energy consumption is calculated to obtain the road condition energy consumption factor; the power spectrum of the total output of each power unit on the preset road condition is obtained, wherein each power unit includes a fuel generator set, a hydrogen fuel engine, a power battery and a wire network power input device; the influence of the road condition energy consumption factor on the power spectrum of the total output of each power unit in time series is calculated to obtain the factor time spectrum sequence; based on the vehicle in the preset road condition, the road condition energy consumption factor is used to calculate the influence of the road condition energy consumption factor on the power spectrum of the total output of each power unit in time series ... The driving speed of the preset road condition is used to convert the time position of the factor time spectrum sequence to obtain a factor position spectrum sequence; the output power to be corrected of the fuel generator set and the hydrogen fuel engine under the working condition is obtained, wherein the output power to be corrected is the output power of the fuel generator set and the hydrogen fuel engine based on the distance distribution on the working condition when the vehicle is driving on the working condition and the power battery and the overhead wire network power input device stop inputting power to the DC bus; the output power to be corrected of the fuel generator set and the hydrogen fuel engine under the working condition is corrected based on the factor distance spectrum sequence to obtain the power output curve based on the distance distribution.

[0075] In this embodiment, the sample road parameters include uphill distance, downhill distance, flat road distance, ramp angle, and rolling resistance coefficient, wherein the rolling resistance coefficient is related to the road quality of the road surface, for example, the rolling resistance coefficient of a gravel road is greater than that of a dirt road, and the rolling resistance coefficient of a dirt road is greater than that of a dusty road. The sample vehicle parameters include air resistance coefficient, windward area, and vehicle mass, wherein the windward area is related to the front windward area of ​​the vehicle, and the vehicle mass is the weight of the vehicle under different load conditions. The corresponding energy consumption of various road conditions can be calculated by the weight of different loads. The calculation process of the road condition energy consumption can be calculated in the manner of single operation energy consumption in the above embodiment. After calculating the road condition energy consumption, the sample road parameters and the sample vehicle parameters are subjected to correlation impact assessment calculation with the road condition energy consumption to obtain multiple road condition energy consumption factors, which are used to reflect the degree of influence of different parameters on energy consumption. Subsequently, the influence of the road condition energy consumption factor on the power spectrum of the total output of each power unit in the time series is calculated, that is, the influence of each road condition energy consumption factor on the total output power of each power unit on the time axis, and the factor time spectrum sequence is obtained. Subsequently, according to the driving speed of the vehicle on the preset road condition, the position of the vehicle at different times is calculated, so as to convert the factor time spectrum sequence into a factor position spectrum sequence, so that the influence of each factor on the total output power of each power unit on different sections and ramps with different inclination angles can be reflected, wherein the factor position spectrum sequence also records the ramp inclination angle and ramp distance corresponding to the position, and the output power to be corrected of the fuel engine and the hydrogen fuel engine in the working road condition is corrected by using the factor distance spectrum sequence to obtain the power output curve, so as to obtain the power output curve matching the working road condition. Based on the power output curve, the power output of the fuel engine and the hydrogen fuel engine in the working road condition can be controlled, so that the fuel engine and the hydrogen fuel engine can output power matching the working road condition, thereby improving the driving efficiency and reducing energy consumption.

[0076] In one embodiment, a multi-source hybrid vehicle is provided, comprising the multi-source hybrid driving system described in any one of the above embodiments and a load, wherein the load comprises a traction motor.

[0077] In one embodiment, the fuel engine unit includes a fuel engine and a first generator, the power output end of the fuel engine is connected to the power input end of the first generator, and the power output end of the first generator is connected to the input end of the first rectifier. In one embodiment, the power output end of the fuel engine is connected to the driving wheel of the vehicle.

[0078] In this embodiment, the fuel engine of the fuel engine unit can not only drive the driving wheels of the vehicle, but also work on the first generator, so that the first generator works to generate electrical energy. The alternating current generated by the first generator is converted into direct current through the first rectifier and transmitted to the DC bus to power the traction motor or charge the power battery.

[0079] In one embodiment, a multi-source hybrid vehicle is provided, which uses a plurality of small different power sources in parallel as power input sources, and the different power sources include diesel engines (plus generators), gasoline engines (plus generators), power batteries, hydrogen fuel engines, and overhead power supply networks, and the diesel engines, gasoline engines, power batteries, hydrogen fuel engines, and overhead power supply networks are mixed and matched to achieve input modularization and miniaturization of different power units, and at the same time, different power units are converted into DC power supply through different power conversion devices, and different power units use a common DC bus to power the load, wherein the load includes electric wheels, cooling fans, water pumps, etc., wherein the electric wheels include traction motors and reducers. In this embodiment, the control module supplies power to the load through the DC bus, and controls the power supply to the traction motor by controlling the inverter.

[0080] The traction power of the rear-end electric wheel (motor and reducer) is related to the weight and slope. The application scenarios of large vehicles, heavy vehicles, large engineering machinery, etc. are generally closed and fixed scenarios such as ports, mines, and construction sites. The daily operating conditions and road conditions are relatively fixed, generally in a cyclic operation mode. The road condition model of the above vehicles can be divided into the following: The road conditions mainly include flat road conditions, uphill road conditions, and downhill road conditions. A completed operation cycle mainly includes: A flat road condition, Uphill conditions, The energy consumed by the vehicle during a working cycle as follows:

[0081] ;

[0082] The electric drive efficiency of the vehicle; is the rolling resistance coefficient; is the air resistance coefficient; is the mass of the pure electric vehicle, g is the gravity coefficient (gravitational acceleration), is the frontal area of ​​the vehicle, θ is the uphill ramp angle, is the downhill slope angle, S is the flat road distance, is the uphill distance, is the downhill distance, is the flat road speed, is the uphill speed, is the downhill speed.

[0083] Energy provided by the multi-source power system:

[0084] For the drive system with multiple power unit input, the diesel generator set power and battery output change as the diesel engine speed increases (diesel generator set output power is ), the power battery system has stable voltage and power output characteristics (the power battery output power is ), the hydrogen fuel engine output power and voltage response are slow (the hydrogen fuel engine output power is ), the power provided by the overhead wire power supply network is The total power that multiple power sources can provide is : + ;

[0085] A single road cycle provides total energy = + x( );

[0086] Energy management of multi-source electric drive system based on road and working conditions:

[0087] The present invention adopts multiple small different power sources in parallel as the power input source. The different power sources can be diesel engines (plus generators), gasoline engines (plus generators), power batteries, hydrogen fuel engines, and overhead power supply networks. The diesel engines, gasoline engines, power batteries, hydrogen fuel engines, and overhead power supply networks can be mixed and matched. The battery system and overhead power supply network can be used as energy storage and feedback energy systems. Engines and hydrogen fuel engines can only be used as power sources, not as feedback energy storage systems.

[0088] Large-scale construction machinery and vehicles operate in the above-mentioned road conditions every day, with N working conditions cycled every day. The multi-source hybrid electric drive control system monitors the power output and load power of each power source in real time, and the power control method of the real-time control system under each road condition cycle is as follows:

[0089] - x( ));

[0090] From the above formula, we can see that the energy provided by the multi-power source is greater than the system energy consumed by the actual vehicle drive end, and the control system is based on the single power Output. It can ensure that the battery system and the wiring system do not provide energy in a single operating condition, maintaining the SOC stability of the battery system.

[0091] - x( )) / N;

[0092] It can be seen from the above formula that the energy provided by the multi-power source system is greater than the system energy consumed by the actual vehicle drive end, and the control system is based on the single power Output. It can ensure that the battery system and the wiring system do not consume energy in N operating conditions a day, and maintain the SOC stability of the battery system.

[0093] x( )) / N< - < x( ));

[0094] It can be seen from the above formula that the energy provided by the multi-power source system is greater than the system energy consumed by the actual vehicle drive end, and the control system is based on the single power Output. It can ensure that in N operating conditions a day, the battery system and the wiring system do not consume energy, and the battery system SOC is maintained to increase.

[0095] - x( )) / N;

[0096] It can be seen from the above formula that the energy provided by the multi-power source system is greater than the system energy consumed by the actual vehicle drive end, and the control system is based on the single power Output. It can ensure that N operating conditions are met in one day, and the battery system consumes the corresponding energy, and energy needs to be provided to the battery system.

[0097] The control system controls the output of multiple power sources. According to the battery system SOC and road conditions, it controls the actual output of the multi-source power system to provide power. , and also select the vehicle's power battery charging and discharging strategy.

[0098] This embodiment provides an electric drive system topology that is compatible with multiple power sources (multiple diesel generator sets, multiple power battery systems, overhead line power supply, hydrogen energy power and multiple hybrid power modes), including diesel generator sets, power battery systems, traction inverters, traction motors, and auxiliary load motors, and is suitable for high-power hybrid applications above megawatt level.

[0099] Based on the application conditions and road conditions of electric drive systems for large vehicles and large projects, the power source of the multi-source hybrid electric drive system consists of a diesel engine unit, a power battery system, a hydrogen energy engine, overhead lines and a mixture thereof. The energy management and control method of the diesel engine unit, the power battery system, the hydrogen energy engine and the overhead lines determines the energy efficiency of the hybrid electric drive system. At the same time, the random diversity of road conditions for large vehicles and engineering machinery is significantly different from the highway conditions of traditional vehicles. This patent proposes a management method based on a new multi-source hybrid electric drive energy and power pair, which effectively improves the energy saving rate of the hybrid system.

[0100] Its beneficial effects: it constructs a multi-source electric drive system topology architecture. Compared with other hybrid power systems, the power system has a wider compatibility range and solves the problem of large power units with high power and heavy pollution; it constructs an energy management method based on actual road conditions and operating cycles, and can select corresponding power control and management methods according to actual working conditions, utilize braking energy, and select energy replenishment strategies for large vehicles and construction machinery power sources according to actual working conditions.

[0101] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0102] 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.

[0103] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A multi-source hybrid power drive system, characterized in that: include: Fuel-fired generator sets, hydrogen-fueled engines, overhead wire network power input devices, power batteries, traction converters and control modules; The traction converter includes a first rectifier, a first DC / DC device, a second DC / DC device, an inverter and a DC bus, and the control module is connected to the first rectifier, the first DC / DC device, the second DC / DC device and the inverter respectively; The power output end of the fuel generator set is connected to the input end of the first rectifier, and the output end of the first rectifier is connected to the DC bus, wherein the fuel generator set includes a fuel engine and a generator; The electric energy output end of the hydrogen fuel engine is connected to the input end of the first DC / DC device, and the output end of the first DC / DC device is connected to the DC bus; The input end of the overhead wire network power input device has a pantograph, and the pantograph is used to connect to the overhead wire network. The output end of the overhead wire network power input device is connected to the DC bus. The output end of the power battery is connected to the DC bus; The input end of the second DC / DC device is connected to the DC bus, and the output end of the second DC / DC device is connected to the input end of the power battery; The input end of the inverter is connected to the DC bus, and the output end of the inverter is used to be connected to a load; The control module is used to control the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device to output voltage according to a preset given voltage value, and when the actual voltage values ​​of the output voltages of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device are not within a preset fluctuation range of the preset given voltage value, and the actual voltage values ​​are less than the preset given voltage value, the preset given voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device are increased; When the actual voltage value is greater than the preset given voltage value, reducing the preset given voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device; By continuously adjusting the preset given voltage value in multiple cycles, voltage fluctuations can be reduced.

2. The multi-source hybrid power drive system according to claim 1, characterized in that: The greater the amplitude by which the actual voltage value is less than the preset given voltage value, the greater the amplitude by which the preset given voltage value is increased; the greater the amplitude by which the actual voltage value is greater than the preset given voltage value, the greater the amplitude by which the preset given voltage value is decreased.

3. The multi-source hybrid power drive system according to claim 1, characterized in that: The control module is used for adjusting preset given voltage values ​​of the output end of the first rectifier, the output end of the first DC / DC device and the output end of the second DC / DC device according to the voltage deviation value when the voltage deviation value outputted by the output end of the first rectifier, the output end of the first DC / DC device and the output end of the second DC / DC device is greater than the preset deviation value, wherein the voltage deviation value is the difference between the largest and the smallest of the output voltages of the output end of the first rectifier, the output end of the first DC / DC device and the output end of the second DC / DC device.

4. The multi-source hybrid power drive system according to claim 3, characterized in that: The control module is used to obtain an increase amplitude and a decrease amplitude corresponding to the voltage deviation value in a preset relationship between the voltage deviation value and the adjustment amplitude, and adjust the preset given voltage value when the voltage deviation value outputted by the output end of the first rectifier, the output end of the first DC / DC device, and the output end of the second DC / DC device is greater than a preset deviation value.

5. The multi-source hybrid power drive system according to claim 4, characterized in that: The overhead wire network electric energy input device includes a voltage conversion device, and the voltage conversion device includes an overhead wire network converter and an overhead wire network transformer. The input end of the overhead wire network converter is connected to the pantograph, the output end of the overhead wire network converter is connected to the input end of the overhead wire network transformer, and the output end of the overhead wire network transformer is connected to the DC bus.

6. The multi-source hybrid power drive system according to any one of claims 1 to 5, characterized in that: The control module is respectively connected to the fuel-fired generator set, the hydrogen fuel engine, the overhead wire network power input device, the power battery and the traction converter; The control module is used to obtain road parameters and vehicle parameters, calculate a single operation energy consumption according to the road parameters and the vehicle parameters, and control the fuel generator set, the hydrogen fuel engine, the overhead wire network power input device and the power battery to supply power to the load according to the operation energy consumption.

7. The multi-source hybrid power driving system according to claim 6, characterized in that: The control module is used to obtain the output energy of the fuel generator set and the hydrogen fuel engine in a single operation. When the output energy of the fuel generator set and the hydrogen fuel engine in a single operation is greater than or equal to the energy consumption of the single operation, the fuel generator set and the hydrogen fuel engine are controlled to supply power to the load, and the overhead wire network power input device and the power battery are controlled to stop supplying power to the load.

8. A multi-source hybrid vehicle, characterized in that: The invention comprises the multi-source hybrid driving system as claimed in any one of claims 1 to 7 and a load, wherein the load comprises a traction motor.

9. The multi-source hybrid vehicle according to claim 8, characterized in that: The fuel engine unit comprises a fuel engine and a first generator, the power output end of the fuel engine is connected to the power input end of the first generator, and the power output end of the first generator is connected to the input end of the first rectifier.

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