Control method of a hybrid electric system, hybrid electric system and cold chain transport vehicle

Abstract

The application discloses a control method of an oil-electric hybrid system, the oil-electric hybrid system and a cold-chain transport vehicle, the oil-electric hybrid system is applied to the cold-chain transport vehicle, the oil-electric hybrid system comprises a fuel generator set and an energy storage device connected with the fuel generator set, and the fuel generator set and the energy storage device are connected with a refrigerating unit assembled on the cold-chain transport vehicle, and the control method comprises the following steps: in the case that the fuel generator set supplies power to the energy storage device and the refrigerating unit, the power consumption of the refrigerating unit is acquired; and the charging power provided by the fuel generator set to the energy storage device is adjusted according to the power consumption of the refrigerating unit and a target power interval, so that the actual output power of the fuel generator set is maintained in the target power interval, wherein the target power interval is set according to a preset fuel consumption threshold of the fuel generator set. Through the application, the fuel consumption of the oil-electric hybrid system of the cold-chain transport vehicle is reduced.

Description

Technical Field

[0001] This invention relates to the field of cold chain transport vehicles, and more particularly to a control method for a hybrid electric system, a hybrid electric system, and a cold chain transport vehicle. Background Technology

[0002] The power consumption of the refrigeration units in railway cold chain transport vehicles changes with the ambient temperature. When the temperature inside the refrigerated container reaches the set temperature, the refrigeration unit stops refrigeration. At this time, the power consumption of the refrigeration unit is extremely low, only enough to power the monitoring system of the refrigeration unit.

[0003] The hybrid electric system equipped on railway refrigerated transport vehicles supplies power to the refrigeration unit. This system consists of a fuel-powered generator set and a battery pack. When the battery pack needs charging, the fuel-powered generator set charges it and supplies power to the refrigeration unit. In this case, the power consumption of the refrigeration unit is superimposed on the power consumption of the fuel-powered generator set. To enable the fuel-powered generator set to handle the maximum power consumption of the refrigeration unit, its rated power needs to be increased, which contradicts the original design intent of the hybrid electric system. Summary of the Invention

[0004] This invention provides a control method for a hybrid electric system, a hybrid electric system, and a cold chain transport vehicle, in order to reduce the fuel consumption of the hybrid electric system in the cold chain transport vehicle.

[0005] In a first aspect of the invention, a control method for a hybrid electric vehicle system is provided. The hybrid electric vehicle system is applied to a cold chain transport vehicle. The hybrid electric vehicle system includes a fuel generator set and an energy storage device connected to the fuel generator set. Both the fuel generator set and the energy storage device are connected to a refrigeration unit installed on the cold chain transport vehicle. The control method includes: when the fuel generator set supplies power to the energy storage device and the refrigeration unit, acquiring the power consumption of the refrigeration unit; and adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and a target power range, so that the actual output power of the fuel generator set is maintained within the target power range, wherein the target power range is set according to a preset fuel consumption threshold of the fuel generator set.

[0006] In conjunction with the first aspect, in some embodiments, adjusting the charging power provided by the fuel generator set to the energy storage device based on the power consumption and the target power range includes: determining a reference power based on the target power range; determining the actual output power of the fuel generator set based on the power consumption; determining the power difference between the reference power and the actual output power; and adjusting the charging power provided by the fuel generator set to the energy storage device based on the power difference.

[0007] In conjunction with the first aspect, in some embodiments, adjusting the charging power provided by the fuel generator set to the energy storage device according to the power difference includes: obtaining the required power limit of the energy storage device; determining a target power value based on the power difference; if the target power value is less than or equal to the required power limit, adjusting the charging power provided by the fuel generator set to the energy storage device to the target power value; if the target power value is greater than the required power limit, adjusting the charging power provided by the fuel generator set to the energy storage device to the required power limit.

[0008] In conjunction with the first aspect, in some embodiments, determining the reference power based on the target power range includes: using the minimum power value within the target power range as the reference power, wherein the target power range is 70% to 90% of the rated power of the fuel generator set.

[0009] In conjunction with the first aspect, in some embodiments, the preset fuel consumption threshold is the fuel consumption rate corresponding to the optimal fuel consumption point of the fuel generator set; the target power range is the power demand of the fuel generator set at the optimal fuel consumption point determined according to the universal characteristic curve of the fuel generator set.

[0010] In conjunction with the first aspect, in some embodiments, adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range of the fuel generator set includes: increasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range after the power consumption of the refrigeration unit decreases; predicting the time when the power consumption of the refrigeration unit will increase next during the operation of the fuel generator set; and decreasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range before the time when the power consumption of the refrigeration unit will increase next.

[0011] In conjunction with the first aspect, in some embodiments, adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range includes: determining a reference power according to the target power range; using the difference between the reference power and the power consumption of the refrigeration unit as a target power value; and adjusting the charging power provided by the fuel generator set to the energy storage device to the target power value.

[0012] In conjunction with the first aspect, in some embodiments, determining the reference power based on the target power range includes: using the minimum power value within the target power range as the reference power, wherein the target power range is 70% to 90% of the rated power of the fuel generator set.

[0013] In conjunction with the first aspect, in some embodiments, the preset fuel consumption threshold is the fuel consumption rate at the optimal fuel consumption point of the fuel generator set; the target power range is the power demand of the fuel generator set at the optimal fuel consumption point determined according to the universal characteristic curve of the fuel generator set.

[0014] In conjunction with the first aspect, in some embodiments, adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range includes: increasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range after the power consumption of the refrigeration unit decreases; predicting the time when the power consumption of the refrigeration unit will increase next during the operation of the fuel generator set; and decreasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range before the time when the power consumption of the refrigeration unit will increase next.

[0015] In conjunction with the first aspect, in some embodiments, predicting the time when the next power consumption of the refrigeration unit will increase includes: predicting the time when the next power consumption of the refrigeration unit will increase by using a pre-established prediction model.

[0016] In conjunction with the first aspect, in some embodiments, predicting the time when the power consumption of the refrigeration unit will increase next by using a pre-established prediction model includes: predicting the time when the power consumption of the refrigeration unit will increase next by using a pre-established prediction model based on the power consumption variation pattern of the prototype during the first usage period of the refrigeration unit.

[0017] In conjunction with the first aspect, in some embodiments, the control method further includes: acquiring historical operating data of the refrigeration unit and optimizing the first prediction model based on the historical operating data; the step of predicting the time when the power consumption of the refrigeration unit will increase next by using the pre-established prediction model includes: predicting the time when the power consumption of the refrigeration unit will increase next by using the optimized first prediction model after the first usage period.

[0018] In conjunction with the first aspect, in some embodiments, the control method further includes: recording the power supply variation pattern of the energy storage device supplying power to the refrigeration unit during the first usage period of the refrigeration unit; establishing a second prediction model based on the power supply variation pattern of the energy storage device; and predicting the time when the power consumption of the refrigeration unit will increase next by using the pre-established prediction model, including: predicting the time when the power consumption of the refrigeration unit will increase next by using the second prediction model after the first usage period.

[0019] In a second aspect of the invention, a control device for a hybrid electric system is provided. The hybrid electric system is applied to a cold chain transport vehicle. The hybrid electric system includes a fuel generator set and an energy storage device connected to the fuel generator set. Both the fuel generator set and the energy storage device are connected to a refrigeration unit installed on the cold chain transport vehicle. The control device includes: an acquisition unit for acquiring the power consumption of the refrigeration unit when the fuel generator set supplies power to the energy storage device and the refrigeration unit; and an adjustment unit for adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and a target power range, so that the actual output power of the fuel generator set is maintained within the target power range, wherein the target power range is set according to a preset fuel consumption threshold of the fuel generator set.

[0020] In a third aspect of the invention, a hybrid electric vehicle system is provided for use in a cold chain transport vehicle. The hybrid electric vehicle system includes: a fuel generator set connected to a refrigeration unit of the cold chain transport vehicle; an energy storage device connected to the fuel generator set and the refrigeration unit; and a charging control device connected to the fuel generator set, the energy storage device, and the refrigeration unit. The charging control device includes: a processor; and a memory for storing processor-executable instructions, wherein the processor is configured to execute the instructions to implement the control method of the hybrid electric vehicle system according to any embodiment of the first aspect.

[0021] In a fourth aspect of the invention, a cold chain transport vehicle is provided, including the hybrid electric system described in any embodiment of the third aspect.

[0022] In a fifth aspect of the invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the control method for a hybrid electric system as described in any embodiment of the first aspect.

[0023] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0024] When a fuel-powered generator set supplies power to an energy storage device and a refrigeration unit, the power consumption of the refrigeration unit is obtained. Based on the power consumption and the target power range of the fuel-powered generator set, the charging power provided by the fuel-powered generator set to the energy storage device is adjusted so that the actual output power of the fuel-powered generator set is maintained within the target power range. This target power range ensures that the fuel consumption of the fuel-powered generator set meets a preset fuel consumption threshold. Therefore, the charging power provided by the fuel-powered generator set to the energy storage device can be dynamically adjusted according to changes in the power consumption of the refrigeration unit, so that the actual output power of the fuel-powered generator set is maintained within a power range with a lower fuel consumption rate most of the time. This reduces the fuel consumption of the hybrid system in cold chain transport vehicles, saves energy, and ultimately improves the economic efficiency of the hybrid system.

[0025] Since the actual output power of the fuel generator set is maintained in the power range with a low fuel consumption rate most of the time, the failure rate of the fuel generator set can also be reduced. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram showing the connection between a hybrid electric system and a refrigeration unit according to some embodiments of the present invention is shown;

[0028] Figure 2 It shows Figure 1 The power supply logic of the Sinopec electric hybrid system supplying power to the refrigeration unit;

[0029] Figure 3 A flowchart of a control method for a hybrid electric system according to some embodiments of the present invention is shown;

[0030] Figure 4 A schematic diagram of data acquisition for the charging control device is shown.

[0031] Figure 5 A schematic diagram of a hybrid electric vehicle system according to some embodiments of the present invention is shown. Detailed Implementation

[0032] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0033] First, it should be clarified that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0034] This invention provides a control method for a hybrid electric vehicle (HEV) system applied to cold chain transport vehicles. In other words, the HEV system is designed for installation on cold chain transport vehicles, such as railway cold chain transport vehicles. It is understood that cold chain transport vehicles include refrigerated containers, refrigeration units, and the HEV system.

[0035] Figure 1 A schematic diagram showing the connection between a hybrid electric system and a refrigeration unit according to some embodiments of the present invention is shown. For example... Figure 1 As shown, the hybrid electric system 10 includes a fuel generator set 110 and an energy storage device 120 connected to the fuel generator set 110. Both the fuel generator set 110 and the energy storage device 120 are connected to a refrigeration unit 30 installed on a cold chain transport vehicle. The energy storage device 120 includes a battery pack 121 (which can be a lithium battery pack) and a charging device 122. When the fuel generator set 110 is running, it supplies power to the energy storage device 120 and the refrigeration unit 20. When the fuel generator set 110 is not running, the battery pack 121 provides DC power to the refrigeration unit 30. When the fuel generator set 110 charges the energy storage device 120, it outputs AC power to the charging device 122, which converts the AC power into DC power to charge the battery pack 121. The fuel generator set 110 also provides AC power to the refrigeration unit 30, and the energy storage device 120 provides DC power to the refrigeration unit 30.

[0036] Figure 2 It shows Figure 1 The power supply logic of the Sinopec electric hybrid system supplying power to the refrigeration unit. For example... Figure 2 As shown, the power supply logic of the hybrid electric system to the refrigeration unit is achieved through a cyclical process of steps S1 to S5. Normally, the energy storage device and the fuel generator set do not simultaneously supply power to the refrigeration unit.

[0037] Step S1: Receive a power supply command instructing the refrigeration unit to supply power;

[0038] Step S2: Determine whether the remaining power of the energy storage device is lower than the low power threshold (e.g., 20%). If yes, proceed to step S3; otherwise, proceed to step S5. The remaining power can be represented by SOC (State of Charge).

[0039] Step S3: Power is supplied to the refrigeration unit and the energy storage device from the fuel generator set, then proceed to step S4;

[0040] Step S4: Determine whether the remaining power of the energy storage device is greater than or equal to the high power threshold (e.g., 90%). If yes, proceed to step S5; otherwise, return to step S3.

[0041] Step S5: The fuel generator set stops, and the energy storage device discharges to supply power to the refrigeration unit, then return to step S2.

[0042] The present invention provides a control method for a hybrid electric system, which is used in step S4 above when the fuel generator set supplies power to the refrigeration unit and the energy storage device, and dynamically adjusts the charging power provided by the fuel generator set to charge the energy storage device according to the change in the power consumption of the refrigeration unit. Figure 3 A flowchart illustrating a control method for a hybrid electric system according to some embodiments of the present invention is shown. For example... Figure 3 As shown, the control method of the hybrid electric system includes the following steps S301 to S302.

[0043] In step S301: When the fuel generator set supplies power to the energy storage device and the refrigeration unit, the power consumption of the refrigeration unit is obtained.

[0044] It should be understood that the power consumption of the refrigeration unit changes with the temperature inside the refrigerated container, and when the temperature inside the refrigerated container reaches the set temperature, the refrigeration unit will stop refrigeration, resulting in very low power consumption. Therefore, it is necessary to obtain the power consumption of the refrigeration unit in real time at a certain frequency, and execute step S302 after each acquisition of the power consumption.

[0045] In step S302: Adjust the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range, so that the actual output power of the fuel generator set is maintained within the target power range, wherein the target power range is set according to the preset fuel consumption threshold of the fuel generator set.

[0046] It should be noted that the actual output power of the fuel-fired generator set is the sum of the electrical power supplied by the refrigeration unit and the charging power supplied by the fuel-fired generator set to the energy storage device.

[0047] In some embodiments, the target power range is the power range corresponding to 70% to 90% of the rated power of the fuel generator set, which can make the fuel consumption rate of the fuel generator set lower than a preset fuel consumption threshold, wherein the preset fuel consumption threshold is an upper limit set for the fuel consumption rate of the fuel generator set.

[0048] In some embodiments, the target power range is the required power that brings the fuel consumption rate of the fuel generator set to the optimal fuel consumption point, where the optimal fuel consumption point is the lowest fuel consumption rate of the fuel generator set determined based on its universal characteristic curve. In other words, the target power range is the required power at the optimal fuel consumption point determined based on the universal characteristic curve of the fuel generator set, and the required power of the fuel generator set at the optimal fuel consumption point is 70% to 90% of its rated power. That is, maintaining the actual output power of the fuel generator set at 70% to 90% of its rated power minimizes the fuel consumption rate of the fuel generator set.

[0049] In some embodiments, the universal characteristic curve of the fuel generator set is obtained, and the power demand of the fuel generator set at the optimal fuel consumption point is calculated based on the universal characteristic curve to obtain the target power range.

[0050] In some embodiments, step S301, adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption of the refrigeration unit and the target power range, may include: determining a reference power according to the target power range; determining the actual output power of the fuel generator set according to the power consumption of the refrigeration unit; determining the power difference between the reference power and the actual output power; and adjusting the charging power provided by the fuel generator set to the energy storage device according to the power difference.

[0051] In some embodiments, adjusting the charging power provided by the fuel generator set to the energy storage device according to the power difference may include: using the difference between the reference power and the actual output power as the power difference, using the sum of the charging power provided by the fuel generator set to the energy storage device and the power difference as the target power value, and adjusting the actual charging power provided by the fuel generator set to the energy storage device from the charging power to the target power value.

[0052] Below, taking a reference power of 14kW as an example, the power consumption of the refrigeration unit is 8kW, and the charging power provided to the energy storage device is 6kW, so that the actual output power of the fuel generator set meets 14kW. As the temperature inside the refrigerated container changes, the power consumption of the refrigeration unit may rise to 10kW. However, if the charging power provided by the fuel generator set to the energy storage device cannot change in time, the actual output power of the fuel generator set will be 16kW, which is -2kW power difference from the reference power of 14kW. The sum of the charging power provided by the fuel generator set to the energy storage device of 6kW and the power difference of -2kW is 4kW. The charging power provided by the fuel generator set to the energy storage device is adjusted to 4kW, thereby maintaining the actual output power of the fuel generator set at 14kW.

[0053] In other embodiments, adjusting the charging power provided by the fuel generator set to the energy storage device based on the power difference may include: using the absolute value of the difference between the reference power and the actual output power of the fuel generator set as the power difference; if the power consumption of the refrigeration unit increases, the charging power provided by the fuel generator set to the energy storage device is increased, and the amount of the increase is the power difference; if the power consumption of the refrigeration unit decreases, the charging power provided by the fuel generator set to the energy storage device is decreased, and the amount of the decrease is the power difference.

[0054] Taking a reference power of 14kW as an example, the refrigeration unit consumes 8kW of electricity and provides 6kW of charging power to the energy storage device, ensuring that the actual output power of the fuel generator set meets the 14kW requirement. As the temperature inside the refrigerated container changes, the power consumption of the refrigeration unit may drop to 6kW, but the charging power provided to the energy storage device may not have time to change. In this case, the actual output power of the fuel generator set is 12kW, which is 2kW lower than the reference power of 14kW. The sum of the 6kW charging power provided by the fuel generator set to the energy storage device and the 2kW power difference is 8kW. By increasing the charging power provided by the fuel generator set to the energy storage device by 2kW to reach 8kW, the actual output power of the fuel generator set is maintained at 14kW.

[0055] To charge the energy storage device within a safe range and protect the device, in some embodiments, the step of adjusting the charging power provided by the fuel generator set to the energy storage device based on the power difference may include: obtaining a power demand limit for the energy storage device; determining a target power value based on the power difference; if the target power value is less than or equal to the power demand limit, adjusting the charging power provided by the fuel generator set to the energy storage device to the target power value; if the target power value is greater than the power demand limit, adjusting the charging power provided by the fuel generator set to the energy storage device to the power demand limit.

[0056] It should be noted that the demand power limit is the maximum allowable charging power set to protect the energy storage device. The above embodiments can ensure that the charging power provided by the fuel generator set to the energy storage device does not exceed the demand power threshold, thereby protecting the energy storage device.

[0057] In some embodiments, step S301, adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range, may include: determining a reference power according to the target power range; using the difference between the reference power and the power consumption of the refrigeration unit as the target power value; and adjusting the charging power provided by the fuel generator set to the energy storage device to the target power value.

[0058] Taking a reference power of 14kW as an example, the power consumption of the refrigeration unit is 8kW, and the charging power provided to the energy storage device is 6kW, so that the actual output power of the fuel generator set meets 14kW. As the temperature inside the refrigerated container changes, the power consumption of the refrigeration unit may drop to 7kW. Before the charging power provided by the fuel generator set to the energy storage device can change, the difference between the reference power and the power consumption of the refrigeration unit changes to 7kW. Then the charging power provided by the fuel generator set to the energy storage device is adjusted to 7kW, thereby maintaining the actual output power of the fuel generator set at 14kW.

[0059] In any of the above embodiments, determining the reference power based on the target power range may include using the minimum power value within the target power range as the reference power. For example, if the target power range is 14–18 kW, then 14 kW will be used as the reference power.

[0060] It should be noted that when the power consumption of the refrigeration unit increases, the charging power provided by the fuel generator to the energy storage device is adjusted according to the power consumption and the target power range, thus reducing the charging power provided by the fuel generator to the energy storage device. Conversely, when the power consumption of the refrigeration unit decreases, the charging power provided by the fuel generator to the energy storage device is adjusted according to the power consumption and the target power range, thus increasing the charging power provided by the fuel generator to the energy storage device. This maintains the actual output power of the fuel generator within the target power range. Therefore, by adjusting the charging power of the energy storage device, the fuel generator can operate within its optimal fuel consumption range most of the time, increasing fuel efficiency and reducing the failure rate of the fuel generator.

[0061] In some embodiments, the power consumption of the refrigeration unit in step S301 can be the actual power consumption of the refrigeration unit currently collected by the detection circuit.

[0062] Because the actual power consumption of the chiller unit, collected by the detection circuit, lags behind the power supplied by the fuel generator set to the chiller unit, that is, it lags behind the actual change in the chiller unit's power consumption. In other words, when a certain power value of the chiller unit's power consumption is collected, the fuel generator set has already been carrying that power value for a certain period of time. To avoid the total power required by the chiller unit and the energy storage device exceeding the rated power of the fuel generator set: If the chiller unit's power consumption increases, the charging power supplied by the fuel generator set to the energy storage device can be reduced before the chiller unit's power consumption increases; if the chiller unit's power consumption decreases, the charging power supplied by the fuel generator set to the energy storage device can be increased after the chiller unit's power consumption decreases.

[0063] Therefore, in some embodiments, obtaining the power consumption of the refrigeration unit in step S301 may include: acquiring the current actual power consumption of the refrigeration unit through a detection circuit, and predicting the future power consumption of the refrigeration unit through a prediction model, wherein the future power consumption is the power value of the refrigeration unit after its power consumption increases next time. For the case where the power consumption of the refrigeration unit decreases, the power consumption of the refrigeration unit used in step S302 is the current actual power consumption of the refrigeration unit acquired by the detection circuit; for the case where the power consumption of the refrigeration unit increases, the power consumption of the refrigeration unit used in step S302 is the future power consumption of the refrigeration unit predicted by the prediction model.

[0064] In some embodiments, adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range of the fuel generator set includes: increasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption of the refrigeration unit and the target power range after the power consumption of the refrigeration unit decreases; predicting the time when the power consumption of the refrigeration unit will increase next during the operation of the fuel generator set; and decreasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range before the time when the power consumption of the refrigeration unit will increase next. It should be understood that this only limits the timing of increasing and decreasing the charging power, and the adjustment amount of increasing and decreasing the charging power is as described in any of the preceding embodiments, which will not be repeated here for the sake of brevity.

[0065] In some embodiments, during the first usage period of the refrigeration unit, the time when the next power consumption of the refrigeration unit will increase is predicted according to the first prediction model, wherein the first prediction model is pre-established based on the power consumption variation law of a prototype of the same model as the refrigeration unit, and the first usage period is a period of time starting from the start time of the first use of the refrigeration unit.

[0066] In some embodiments, the control method for the hybrid electric system further includes: acquiring historical operating data of the chiller unit, wherein the historical operating data includes historical ambient temperature, historical power consumption of the chiller unit, and historical start-up and shutdown times; optimizing a first prediction model based on the historical operating data, so that the first prediction model can more accurately predict the time point when the power of the chiller unit increases and the future power consumption, thereby correcting the adjustment logic of the charging power provided to the energy storage device to maximize economic efficiency.

[0067] In some embodiments, historical operating data of the chiller unit within the current time window is obtained according to a preset update frequency and time window, and the first prediction model is optimized based on the historical operating data within the current time window.

[0068] In other embodiments, the power supply variation patterns of the energy storage device to the chiller are recorded during the first usage period of the chiller; a second prediction model is established based on the power supply variation patterns of the energy storage device; after the first usage period, the second prediction model is used to predict the time when the chiller's next power consumption will increase and the future power consumption. This allows the adjustment logic of the charging power supplied to the energy storage device to be corrected based on the actual power consumption of the chiller, maximizing economic efficiency.

[0069] Based on the same inventive concept, this invention also provides a hybrid electric system for use in cold chain transport vehicles. Figure 4 A schematic diagram of data acquisition for the charging control device is shown. For example... Figure 1 and Figure 4 As shown, the hybrid electric system 10 includes: a fuel generator set 110 connected to the refrigeration unit 20 of the cold chain transport vehicle; and an energy storage device 120 connected to the fuel generator set 110 and the refrigeration unit 20. It also includes a charging control device 130 connected to the fuel generator set 110, the refrigeration unit 20, and the energy storage device 120.

[0070] Figure 5 A schematic diagram of a hybrid electric vehicle system according to some embodiments of the present invention is shown. For example... Figure 5 As shown, the charging control device 130 includes: one or more memories 404, one or more processors 402, and at least one computer program (computer execution instructions) stored in the memory 404 and executable on the processor 402. When the processor 402 executes the computer program, it implements the control method of the hybrid electric system described in any of the above embodiments.

[0071] Among them, Figure 5 In this document, a bus architecture (represented by bus 400) is used. Bus 400 may include any number of interconnected buses and bridges, connecting various circuits including one or more processors represented by processor 402 and memory represented by memory 404. Bus 400 may also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 405 provides an interface between bus 400 and receiver 401 and transmitter 403. Receiver 401 and transmitter 403 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 402 is responsible for managing bus 400 and general processing, while memory 404 can be used to store data used by processor 402 during operation.

[0072] like Figure 4As shown, in order to control the charging power provided by the fuel generator set 110 to the energy storage device 120, the charging control device 130 needs to obtain the power consumption of the refrigeration unit 20 in real time, as well as the power demand limit of the energy storage device 120 in real time, and also needs to obtain the universal characteristic curve of the fuel generator set 110.

[0073] Based on the same inventive concept, embodiments of the present invention also provide a cold chain transport vehicle, including a refrigerated container, a refrigeration unit, and a hybrid electric system of any of the above embodiments.

[0074] Based on the same inventive concept, this invention also provides a control device for a hybrid electric vehicle (HEV) system. The HEV system is applied to a cold chain transport vehicle. The HEV system includes a fuel generator set and an energy storage device connected to the fuel generator set. Both the fuel generator set and the energy storage device are connected to a refrigeration unit installed on the cold chain transport vehicle. The control device includes: an acquisition unit for acquiring the power consumption of the refrigeration unit when the fuel generator set supplies power to the energy storage unit and the refrigeration unit; and an adjustment unit for adjusting the charging power provided by the fuel generator set to the energy storage unit according to the power consumption and a target power range, so that the actual output power of the fuel generator set is maintained within the target power range. The target power range is set according to a preset fuel consumption threshold of the fuel generator set. It is understood that further implementation details of the control device for the HEV system can be found in the control method for the aforementioned HEV system, and will not be repeated here for the sake of brevity.

[0075] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the control method of the above-described hybrid electric system.

[0076] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0077] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0078] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0079] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0080] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0081] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A control method for a hybrid electric vehicle system, characterized in that, The hybrid electric system is applied to cold chain transport vehicles. The hybrid electric system includes a fuel generator set and an energy storage device connected to the fuel generator set. Both the fuel generator set and the energy storage device are connected to a refrigeration unit installed on the cold chain transport vehicle. The control method includes: When the fuel generator set supplies power to the energy storage device and the refrigeration unit, the power consumption of the refrigeration unit is obtained; Adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range includes: increasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range after the power consumption of the refrigeration unit decreases; predicting the time when the power consumption of the refrigeration unit will increase next during the operation of the fuel generator set; and decreasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range before the time when the power consumption of the refrigeration unit increases next, so that the actual output power of the fuel generator set is maintained within the target power range, wherein the target power range is set according to the preset fuel consumption threshold of the fuel generator set.

2. The control method for a hybrid electric system as described in claim 1, characterized in that, The step of adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range includes: Determine the reference power based on the target power range; The actual output power of the fuel generator set is determined based on the power consumption. Determine the power difference between the reference power and the actual output power; The charging power supplied by the fuel generator set to the energy storage device is adjusted according to the power difference.

3. The control method for a hybrid electric system as described in claim 2, characterized in that, The step of adjusting the charging power provided by the fuel generator set to the energy storage device according to the power difference includes: Obtain the required power limit of the energy storage device; The target power value is determined based on the power difference. If the target power value is less than or equal to the required power limit, the charging power provided by the fuel generator set to the energy storage device shall be adjusted to the target power value. If the target power value is greater than the required power limit, the charging power provided by the fuel generator set to the energy storage device shall be adjusted to the required power limit.

4. The control method for a hybrid electric system as described in claim 1, characterized in that, The step of adjusting the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range includes: Determine the reference power based on the target power range; The difference between the reference power and the power consumption of the refrigeration unit is taken as the target power value; The charging power supplied by the fuel generator set to the energy storage device is adjusted to the target power value.

5. The control method for a hybrid electric system as described in claim 2 or 4, characterized in that, Determining the reference power based on the target power range includes: The minimum power value within the target power range is used as the reference power, wherein the target power range is 70% to 90% of the rated power of the fuel generator set.

6. The control method for a hybrid electric system as described in claim 5, characterized in that, The preset fuel consumption threshold is the fuel consumption rate at the optimal fuel consumption point of the fuel generator set; the target power range is the power demand of the fuel generator set at the optimal fuel consumption point, determined according to the universal characteristic curve of the fuel generator set.

7. The control method for a hybrid electric system as described in claim 1, characterized in that, Predicting the time when the next power consumption of the refrigeration unit will increase includes: The timing of the next increase in power consumption of the refrigeration unit is predicted using a pre-established predictive model.

8. The control method for a hybrid electric system as described in claim 7, characterized in that, The prediction of the next time the power consumption of the refrigeration unit will increase using a pre-established prediction model includes: During the first usage period of the refrigeration unit, a first prediction model, pre-established based on the power consumption variation pattern of a prototype of the same model as the refrigeration unit, predicts the time when the power consumption of the refrigeration unit will increase next.

9. The control method for a hybrid electric system as described in claim 8, characterized in that, Also includes: Obtain historical operating data of the refrigeration unit, and optimize the first prediction model based on the historical operating data; The prediction of the next time the power consumption of the refrigeration unit will increase using a pre-established prediction model includes: After the first usage period, the time when the power consumption of the refrigeration unit will increase next is predicted based on the optimized first prediction model.

10. The control method for a hybrid electric system as described in claim 7, characterized in that, Also includes: Record the power supply variation pattern of the energy storage device supplying power to the refrigeration unit during the first usage period of the refrigeration unit; A second prediction model is established based on the power supply variation pattern of the energy storage device; The timing of the next increase in power consumption of the refrigeration unit is predicted using a pre-established prediction model, including: After the first usage period, the second prediction model predicts the time when the next power consumption of the refrigeration unit will increase.

11. A control device for a hybrid electric vehicle system, characterized in that, The hybrid electric system is applied to cold chain transport vehicles. The hybrid electric system includes a fuel generator set and an energy storage device connected to the fuel generator set. Both the fuel generator set and the energy storage device are connected to a refrigeration unit installed on the cold chain transport vehicle. The control device includes: The acquisition unit is used to acquire the power consumption of the refrigeration unit when the fuel generator set supplies power to the energy storage device and the refrigeration unit. An adjustment unit is configured to adjust the charging power provided by the fuel generator set to the energy storage device according to the power consumption and a target power range, including: increasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range after the power consumption of the refrigeration unit decreases; predicting the time when the power consumption of the refrigeration unit will increase next during the operation of the fuel generator set; and decreasing the charging power provided by the fuel generator set to the energy storage device according to the power consumption and the target power range before the time when the power consumption of the refrigeration unit will increase next, so that the actual output power of the fuel generator set is maintained within the target power range, wherein the target power range is set according to a preset fuel consumption threshold of the fuel generator set.

12. A hybrid electric system for use in cold chain transport vehicles, the hybrid electric system comprising: A fuel-powered generator set is connected to the refrigeration unit of the cold chain transport vehicle; An energy storage device, wherein the fuel generator set and the refrigeration unit are connected; A charging control device is connected to the fuel generator set, the energy storage device, and the refrigeration unit, wherein the charging control device includes: a processor; and a memory for storing processor-executable instructions, wherein the processor is configured to execute the instructions to implement the control method of the hybrid electric system as described in any one of claims 1 to 10.

13. A cold chain transport vehicle, characterized in that, Includes the hybrid electric system as described in claim 12.

14. A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of any one of claims 1-10 for a hybrid electric vehicle system.

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