Driving control method and driving control device for hybrid vehicle in series mode

Abstract

The present disclosure relates to a hybrid vehicle driving control method in series mode, a hybrid vehicle driving control device in series mode, a storage medium and a control system. The hybrid vehicle driving control method in series mode comprises determining a driving demand power interval corresponding to driving the vehicle in a target speed range according to the target speed range when the vehicle is driving in series mode; determining a plurality of engine speed values corresponding to the overall efficiency of the engine and the generator exceeding a predetermined threshold based on a plurality of different driving demand powers in the driving demand power interval according to the overall efficiency distribution of the engine and the generator; selecting an engine speed value as a target engine speed value from the plurality of engine speed values according to the target speed of the vehicle driving in the target speed range; and controlling the engine to work at the target engine speed value to output power to drive the vehicle, which can reduce the adjustment frequency of the engine speed and reduce fuel consumption.

Description

Hybrid vehicle driving control method and driving control device in series mode Technical Field

[0001] This disclosure relates to the field of vehicle technology, and in particular to a driving control method, a driving control device, a storage medium, and a control system for a hybrid vehicle in series mode. Background Technology

[0002] With the release of the new dual-credit policy and corporate average fuel consumption limits, companies are facing increasing pressure to reduce fuel consumption. The cost of reducing fuel consumption in traditional gasoline vehicles is rising, leading companies to invest more heavily in new energy vehicles. Energy-saving vehicles, new energy vehicles, and fuel cell vehicles will be the main trends over the next five years, making energy management for new energy vehicles increasingly important. Meanwhile, with continued fluctuations in crude oil prices, users are becoming more sensitive to fuel consumption. To improve customer satisfaction, further reductions in the fuel consumption of new energy vehicles are necessary. Summary of the Invention

[0003] In view of this, the present disclosure aims to provide a driving control method, a driving control device, a storage medium, and a control system for a hybrid vehicle in series mode.

[0004] The technical solution disclosed herein is implemented as follows:

[0005] In one aspect, this disclosure provides a driving control method for a hybrid vehicle in series mode.

[0006] The driving control method for hybrid vehicles in series mode provided in this disclosure is applied to a control system and includes:

[0007] Based on the target speed range of the vehicle when driving in series mode, determine the corresponding drive power range required to drive the vehicle when driving within the target speed range.

[0008] Based on the overall efficiency distribution of the engine and generator, and according to multiple different drive demand power within the drive demand power range, multiple engine speed values ​​corresponding to the overall efficiency of the engine and generator exceeding a predetermined threshold are determined; wherein, one drive demand power corresponds to one engine speed value.

[0009] Based on the target vehicle speed when the vehicle is traveling within the target speed range, select one engine speed value from the plurality of engine speed values ​​as the target engine speed value;

[0010] The engine is controlled to operate at the target engine speed to output power and drive the vehicle.

[0011] In some embodiments, determining multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding a predetermined threshold based on the combined efficiency distribution of the engine and generator, according to multiple different drive demand power within the drive demand power range, includes:

[0012] Obtain the test results obtained by driving the vehicle within the target speed range with the goal of minimizing fuel consumption.

[0013] Based on the test results, the engine speed value corresponding to the minimum fuel consumption is determined within the plurality of engine speed values;

[0014] The engine speed value corresponding to the minimum fuel consumption is taken as the engine speed value used by the engine to output power generation when the vehicle is driving within the target speed range.

[0015] In some embodiments, selecting an engine speed value from the plurality of engine speed values ​​as the target engine speed value based on the target vehicle speed when the vehicle is traveling within the target speed range includes:

[0016] Based on the target vehicle speed when the vehicle is traveling within the target speed range, select the engine speed value among the plurality of engine speed values ​​whose output power generation is closest to the drive demand power corresponding to the target vehicle speed;

[0017] The engine speed value whose output power is closest to the driving power required at the target vehicle speed is taken as the target engine speed value for driving the vehicle at the target vehicle speed.

[0018] In some embodiments, determining multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding a predetermined threshold based on the combined efficiency distribution of the engine and generator, according to multiple different drive demand power within the drive demand power range, includes:

[0019] The driving power demand range is divided into multiple power range segments;

[0020] Determine a drive demand power within one of the power ranges;

[0021] Based on the multiple different drive demand power, and according to the overall efficiency distribution of the engine and generator, multiple engine speed values ​​corresponding to the overall efficiency of the engine and generator exceeding the predetermined threshold are determined.

[0022] Secondly, this disclosure provides a driving control device for a hybrid vehicle in series mode, comprising:

[0023] The power range determination module is used to determine the driving power range corresponding to driving the vehicle within the target speed range based on the target speed range of the vehicle when driving in series mode.

[0024] An engine speed value determination module is used to determine multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding a predetermined threshold based on the overall efficiency distribution of the engine and generator and multiple different drive demand power within the drive demand power range; wherein, one drive demand power corresponds to one engine speed value;

[0025] The target engine speed value determination module is used to select one engine speed value as the target engine speed value from the plurality of engine speed values ​​based on the target vehicle speed when the vehicle is driving within the target vehicle speed range.

[0026] An engine control module is used to control the engine to operate at the target engine speed and output power to drive the vehicle.

[0027] In some embodiments, the engine speed value determination module is used for

[0028] Obtain the test results obtained by driving the vehicle within the target speed range with the goal of minimizing fuel consumption.

[0029] Based on the test results, the engine speed value corresponding to the minimum fuel consumption is determined within the plurality of engine speed values;

[0030] The engine speed value corresponding to the minimum fuel consumption is taken as the engine speed value used by the engine to output power generation when the vehicle is driving within the target speed range.

[0031] In some embodiments, the target engine speed value determination module is used for

[0032] Based on the target vehicle speed when the vehicle is traveling within the target speed range, select the engine speed value among the plurality of engine speed values ​​whose output power generation is closest to the drive demand power corresponding to the target vehicle speed;

[0033] The engine speed value whose output power is closest to the driving power required at the target vehicle speed is taken as the target engine speed value for driving the vehicle at the target vehicle speed.

[0034] In some embodiments, the engine speed value determination module is used for

[0035] The driving power demand range is divided into multiple power range segments;

[0036] Determine a drive demand power within one of the power ranges;

[0037] Based on the multiple different drive demand power, and according to the overall efficiency distribution of the engine and generator, multiple engine speed values ​​corresponding to the overall efficiency of the engine and generator exceeding the predetermined threshold are determined.

[0038] Thirdly, this disclosure provides a computer-readable storage medium storing a driving control program for a hybrid vehicle in series mode. When the driving control program for a hybrid vehicle in series mode is executed by a processor, it implements the driving control method for a hybrid vehicle in series mode described in the first aspect.

[0039] Fourthly, this disclosure provides a control system, including a memory, a processor, and a driving control program for a hybrid vehicle in series mode stored in the memory and executable on the processor. When the processor executes the driving control program for the hybrid vehicle in series mode, it implements the driving control method for the hybrid vehicle in series mode described in the first aspect above.

[0040] The driving control method for a hybrid vehicle in series mode according to an embodiment of this disclosure includes: determining a driving power demand range corresponding to the vehicle's driving speed within the target speed range based on the target speed range of the vehicle in series mode; determining multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding a predetermined threshold based on multiple different driving power demands within the driving power demand range, according to the combined efficiency distribution of the engine and generator; wherein one driving power demand corresponds to one engine speed value; selecting one engine speed value from the multiple engine speed values ​​as the target engine speed value based on the target vehicle speed within the target speed range; and controlling the engine to operate at the target engine speed value to output power generation to drive the vehicle. This application determines multiple high-efficiency zone engine speed values ​​based on the combined efficiency distribution of the engine and generator. These values ​​can be selected as target engine speed values ​​when the vehicle is driving within the target speed range. This allows the vehicle to select from the high-efficiency zone engine speed values ​​according to changes in the target speed, enabling the engine to output power and improve fuel efficiency. It also reduces the frequency of engine speed adjustments caused by changes in vehicle speed, thereby reducing fuel consumption caused by frequent engine speed adjustments due to vehicle speed changes.

[0041] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0042] Figure 1 is a flowchart illustrating a driving control method for a hybrid vehicle in series mode according to an exemplary embodiment;

[0043] Figure 2 is a schematic diagram of a hybrid vehicle in series mode according to an exemplary embodiment;

[0044] Figure 3 is a schematic diagram illustrating the combined efficiency distribution of the engine and generator according to an exemplary embodiment;

[0045] Figure 4 is a flowchart illustrating the optimal economy calibration of a hybrid vehicle in series mode according to an exemplary embodiment.

[0046] Figure 5 is a schematic diagram of the driving control device structure of a hybrid vehicle in series mode according to an exemplary embodiment. Detailed Implementation

[0047] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0048] With the release of the new dual-credit policy and corporate average fuel consumption limits, companies are facing increasing pressure to reduce fuel consumption. The cost of reducing fuel consumption in traditional gasoline vehicles is rising, leading companies to invest more heavily in new energy vehicles. Energy-saving vehicles, new energy vehicles, and fuel cell vehicles will be the main trends over the next five years, making energy management for new energy vehicles increasingly important. Meanwhile, with continued fluctuations in crude oil prices, users are becoming more sensitive to fuel consumption. To improve customer satisfaction, further reductions in the fuel consumption of new energy vehicles are necessary.

[0049] Existing control schemes match engine power and speed to demand power. As demand power changes continuously, engine power also changes continuously. Consequently, engine speed and torque also change continuously, resulting in a continuously fluctuating engine. This leads to higher fuel consumption due to the constantly changing engine speed and torque. When engine speed and torque are constantly changing, transient compensation, high-load enrichment, and fuel cut-off compensation occur. Transient compensation refers to the increased intake air when the accelerator is pressed suddenly. Due to wall adhesion and evaporation effects, the actual fuel injection quantity is much higher than the theoretical air-fuel ratio, increasing fuel consumption. High-load enrichment refers to fuel injection enrichment under high load based on exhaust temperature control, increasing fuel consumption. Fuel cut-off compensation refers to fuel cut-off during coasting followed by accelerator pressing again when the combustion chamber walls are dry; to maintain power, more fuel is injected, increasing fuel consumption.

[0050] To address the above issues, this disclosure provides a driving control method for a hybrid vehicle in series mode. Figure 1 is a flowchart illustrating a driving control method for a hybrid vehicle in series mode according to an exemplary embodiment. As shown in Figure 1, the driving control method for a hybrid vehicle in series mode includes:

[0051] Step 10: Based on the target speed range of the vehicle when driving in series mode, determine the driving power range corresponding to driving the vehicle within the target speed range.

[0052] Step 11: Based on the overall efficiency distribution of the engine and generator, determine multiple engine speed values ​​corresponding to the overall efficiency of the engine and generator exceeding a predetermined threshold according to multiple different drive demand power within the drive demand power range; wherein, one drive demand power corresponds to one engine speed value.

[0053] Step 12: Based on the target vehicle speed when the vehicle is traveling within the target speed range, select one engine speed value from the plurality of engine speed values ​​as the target engine speed value;

[0054] Step 13: Control the engine to operate at the target engine speed and output power to drive the vehicle.

[0055] In this exemplary embodiment, Figure 2 is a schematic diagram of a hybrid vehicle in series mode according to an exemplary embodiment. As shown in Figure 2, a hybrid vehicle equipped with a DHT (Dedicated Hybrid Transmission) enters series mode when the engine cannot drive the vehicle directly at low speeds (in series mode, the engine drives a generator (usually the motor at position P1) to generate electricity, which is then transmitted to the drive motor through the controller (inverter), and the drive motor provides power to drive the vehicle; the engine does not drive the vehicle directly throughout the process). However, the vehicle's operating condition will not always be in a steady-state condition at engine speed. At this time, the engine operating condition is reasonably set through calibration, so that the engine operates in the high-efficiency range and steady-state condition for as long as possible, while taking into account generator efficiency and charging and discharging losses, thereby achieving fuel saving.

[0056] In this exemplary embodiment, FIG3 is a schematic diagram illustrating the combined efficiency distribution of an engine and a generator according to an exemplary embodiment. As shown in FIG3, the combined efficiency distribution of the engine and generator can be obtained from the combined efficiency distribution MAP of the engine and generator. The combined efficiency distribution MAP of the engine and generator is determined by the efficiency of the engine and generator at the time of manufacture. In FIG3, the horizontal axis represents the engine speed value, the vertical axis represents the drive demand power, and the curves are labeled with the combined efficiency of the engine and generator. For example, l, m, n, etc., all represent the combined efficiency of the engine and generator.

[0057] In this exemplary embodiment, a target vehicle speed when the vehicle is driving in series mode corresponds to a driving power demand range. Therefore, the target vehicle speed range when the vehicle is driving in series mode corresponds to the driving power demand range when driving the vehicle within the target vehicle speed range.

[0058] In this exemplary embodiment, the predetermined threshold is determined as the high-efficiency zone threshold. If the combined efficiency of the engine and generator exceeds the predetermined threshold, it indicates that the combined efficiency of the engine and generator is within the high-efficiency zone.

[0059] In this exemplary embodiment, when the vehicle is driving in series mode, multiple engine speed values ​​distributed in the high-efficiency zone are determined within the target vehicle speed range as target engine speed values ​​for driving at the target vehicle speed. These multiple engine speed values ​​distributed in the high-efficiency zone can be determined based on the combined efficiency distribution of the engine and generator, and on multiple different drive demand power within the drive demand power range. This allows the engine to be controlled to operate at the determined engine speed values ​​distributed in the high-efficiency zone when the vehicle is driving in series mode within the target vehicle speed range, outputting generator power. This reduces the frequency of frequent engine speed adjustments due to vehicle speed changes, thereby reducing fuel consumption caused by frequent engine speed adjustments due to vehicle speed changes. Simultaneously, the vehicle can select from the engine speed values ​​distributed in the high-efficiency zone according to changes in the target vehicle speed to enable the engine to operate and output generator power, which helps improve engine fuel efficiency. Furthermore, the driving control method for hybrid vehicles in series mode of this application does not involve transient compensation, high-load enrichment, or fuel cut-off compensation.

[0060] In some embodiments, determining multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding a predetermined threshold based on the combined efficiency distribution of the engine and generator, according to multiple different drive demand power within the drive demand power range, includes:

[0061] Obtain the test results obtained by driving the vehicle within the target speed range with the goal of minimizing fuel consumption.

[0062] Based on the test results, the engine speed value corresponding to the minimum fuel consumption is determined within the plurality of engine speed values;

[0063] The engine speed value corresponding to the minimum fuel consumption is taken as the engine speed value used by the engine to output power generation when the vehicle is driving within the target speed range.

[0064] In this exemplary embodiment, based on the multiple engine speed values, and with the minimum fuel consumption as the test objective, when conducting a driving test on the vehicle within the target speed range, according to the law of conservation of energy, the power equation can be derived: P(engine power generation) = P(battery charging or discharging power) + P(driving demand power) + P(electrical and accessory power). During the test, a comprehensive vehicle NVH assessment can be incorporated, considering the impact of selected engine speeds on overall vehicle NVH. For example, minimizing the impact on NVH is preferred.

[0065] Each power P is analyzed as follows:

[0066] P (engine power generation) should be used to stabilize the engine speed as much as possible to suppress engine efficiency loss; in particular, the engine and generator speeds should be kept in the high-efficiency range as much as possible.

[0067] P (battery charging or discharging power) should minimize the amount of charging or discharging the battery to reduce charging and discharging efficiency loss.

[0068] P (drive power demand) is related to user usage and will not be analyzed.

[0069] P (power of electrical appliances and accessories) is related to the vehicle's configuration and functions, and will not be analyzed.

[0070] In this application, P (battery charging or discharging power) should minimize battery charging or discharging to reduce charging and discharging efficiency loss. To ensure that P (battery charging or discharging power) minimizes battery charging or discharging, a higher number of selected engine speeds brings the battery closer to zero charging and discharging. However, this contradicts the goal of reducing the number of selected engine speeds for fixed-point power generation. Therefore, the number of selected engine speeds needs to be considered: with fewer selected speeds, to prevent battery depletion, the power generation at most vehicle speeds is too high, resulting in charging and discharging efficiency loss. With more selected speeds, the rapid changes in engine speed and the resulting engine efficiency loss must be considered. These two factors need to be calculated and balanced, with the specific results based on experimental comparisons. Additionally, the overall vehicle NVH evaluation at the selected speeds needs to be considered. For example, within the target vehicle speed range, one set of nine engine speed values ​​can be selected for fuel consumption evaluation, and another set of six engine speed values ​​can be selected for fuel consumption evaluation. If the fuel consumption of the six engine speed values ​​is less than that of the nine engine speed values, then these six engine speed values ​​are suitable as the engine speed values ​​for outputting power generation.

[0071] This application starts from the relationship between engine fuel consumption and transient and steady-state speed, and through calibration strategy, aims to keep the engine in steady-state speed condition as much as possible, thereby achieving fuel economy in series mode of hybrid vehicles.

[0072] In some embodiments, selecting an engine speed value from the plurality of engine speed values ​​as the target engine speed value based on the target vehicle speed when the vehicle is traveling within the target speed range includes:

[0073] Based on the target vehicle speed when the vehicle is traveling within the target speed range, select the engine speed value among the plurality of engine speed values ​​whose output power generation is closest to the drive demand power corresponding to the target vehicle speed;

[0074] The engine speed value whose output power is closest to the driving power required at the target vehicle speed is taken as the target engine speed value for driving the vehicle at the target vehicle speed.

[0075] In this exemplary embodiment, Table 1 is a table of engine speed values. As shown in Table 1, one engine speed corresponds to one power output and one target vehicle speed. When the target vehicle speed is between D and E, the corresponding engine speed can be the second speed. That is, when the target vehicle speed is D, the output power output corresponding to the second engine speed is closest to the drive demand power corresponding to the target vehicle speed D, and at this time, the target engine speed value is determined to be the second speed.

[0076] Table 1 Engine Speed ​​Values

[0077]

[0078] In some embodiments, determining multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding a predetermined threshold based on the combined efficiency distribution of the engine and generator, according to multiple different drive demand power within the drive demand power range, includes:

[0079] The driving power demand range is divided into multiple power range segments;

[0080] Determine a drive demand power within one of the power ranges;

[0081] Based on the multiple different drive demand power, and according to the overall efficiency distribution of the engine and generator, multiple engine speed values ​​corresponding to the overall efficiency of the engine and generator exceeding the predetermined threshold are determined.

[0082] In this exemplary embodiment, the engine speed corresponding to the required power is segmented, and a fixed speed is assigned to each power segment. The engine speed is stable within each power segment, thereby reducing fuel consumption accordingly.

[0083] Figure 4 is a flowchart illustrating the optimal economy calibration process for a hybrid vehicle in series mode according to an exemplary embodiment. As shown in Figure 4, the optimal economy calibration process for a hybrid vehicle in series mode includes:

[0084] Step 40: Begin;

[0085] Step 41: Confirm the speed range in series mode;

[0086] Step 42: Obtain the overall efficiency diagram of engine * P1 generator and confirm the power range of series mode;

[0087] Step 43: Select the most efficient RPM point corresponding to different vehicle speeds;

[0088] Step 44: Based on the vehicle NVH evaluation at the selected speed, select different number of speed points to conduct real vehicle fuel consumption tests;

[0089] Step 45: Confirm and calibrate the engine speed values ​​and number of speeds at different vehicle speeds;

[0090] Step 46, End.

[0091] This application selects a different number of engine speeds for real-vehicle fuel consumption testing, while also considering the impact of the selected engine speeds on the overall vehicle NVH. Guided by the goal of achieving optimal fuel consumption, the application ultimately selects the number of engine speeds and the corresponding engine speed values ​​for different vehicle speed ranges, and calibrates and assigns these values. Through this calibration method, it can be ensured that the hybrid vehicle operates in a relatively steady-state condition (constant engine speed) in series mode and operates at the optimal engine speed, thereby guaranteeing optimal economy in series mode.

[0092] This disclosure provides a driving control device for a hybrid vehicle in series mode. Figure 5 is a schematic diagram illustrating the structure of the driving control device for a hybrid vehicle in series mode according to an exemplary embodiment. As shown in Figure 5, the driving control device for a hybrid vehicle in series mode includes:

[0093] The power range determination module 51 is used to determine the driving power range corresponding to driving the vehicle within the target speed range based on the target speed range of the vehicle when driving in series mode.

[0094] The engine speed value determination module 52 is used to determine multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding a predetermined threshold based on the overall efficiency distribution of the engine and generator and multiple different drive demand power within the drive demand power range; wherein, one drive demand power corresponds to one engine speed value.

[0095] The target engine speed value determination module 53 is used to select one engine speed value as the target engine speed value from the plurality of engine speed values ​​based on the target vehicle speed when the vehicle is driving within the target vehicle speed range.

[0096] The engine control module 54 is used to control the engine to operate at the target engine speed and output power to drive the vehicle.

[0097] In this exemplary embodiment, a hybrid vehicle equipped with a DHT (Dedicated Hybrid Transmission) enters a series mode when the engine cannot drive the vehicle directly at low speeds (in series mode, the engine drives a generator (usually the motor in position P1) to generate electricity, which is then transmitted to the drive motor via a controller (inverter), and the drive motor provides power to drive the vehicle; the engine does not drive the vehicle directly throughout the process). However, the vehicle's operating condition will not always be in a steady-state condition at engine speed. Therefore, calibration is used to reasonably set the engine's operating conditions, allowing the engine to operate in the high-efficiency range and steady-state condition for as long as possible, while also considering generator efficiency and charging / discharging losses, thereby achieving fuel savings.

[0098] In this exemplary embodiment, the combined efficiency distribution of the engine and generator can be obtained based on the combined efficiency distribution MAP of the engine and generator. The combined efficiency distribution MAP of the engine and generator is determined by the efficiency of the engine and generator at the time of manufacture.

[0099] In this exemplary embodiment, a target vehicle speed when the vehicle is driving in series mode corresponds to a driving power demand range. Therefore, the target vehicle speed range when the vehicle is driving in series mode corresponds to the driving power demand range when driving the vehicle within the target vehicle speed range.

[0100] In this exemplary embodiment, the predetermined threshold is determined as the high-efficiency zone threshold. If the combined efficiency of the engine and generator exceeds the predetermined threshold, it indicates that the combined efficiency of the engine and generator is within the high-efficiency zone.

[0101] In this exemplary embodiment, when the vehicle is driving in series mode, multiple engine speed values ​​distributed in the high-efficiency zone are determined within the target vehicle speed range as target engine speed values ​​for driving at the target vehicle speed. These multiple engine speed values ​​distributed in the high-efficiency zone can be determined based on the combined efficiency distribution of the engine and generator, and on multiple different drive demand power within the drive demand power range. This allows the engine to be controlled to operate at the determined engine speed values ​​distributed in the high-efficiency zone when the vehicle is driving in series mode within the target vehicle speed range, outputting generator power. This reduces the frequency of frequent engine speed adjustments due to vehicle speed changes, thereby reducing fuel consumption caused by frequent engine speed adjustments due to vehicle speed changes. Simultaneously, the vehicle can select from the engine speed values ​​distributed in the high-efficiency zone according to changes in the target vehicle speed to enable the engine to operate and output generator power, which helps improve engine fuel efficiency. Furthermore, the driving control method for hybrid vehicles in series mode of this application does not involve transient compensation, high-load enrichment, or fuel cut-off compensation.

[0102] In some embodiments, the engine speed value determination module is used for

[0103] Obtain the test results obtained by driving the vehicle within the target speed range with the goal of minimizing fuel consumption.

[0104] Based on the test results, the engine speed value corresponding to the minimum fuel consumption is determined within the plurality of engine speed values;

[0105] The engine speed value corresponding to the minimum fuel consumption is taken as the engine speed value used by the engine to output power generation when the vehicle is driving within the target speed range.

[0106] In this exemplary embodiment, based on the multiple engine speed values, and with the minimum fuel consumption as the test objective, when conducting a driving test on the vehicle within the target speed range, according to the law of conservation of energy, the power equation can be derived: P(engine power generation) = P(battery charging or discharging power) + P(driving demand power) + P(electrical and accessory power). During the test, a comprehensive vehicle NVH assessment can be incorporated, considering the impact of selected engine speeds on overall vehicle NVH. For example, minimizing the impact on NVH is preferred.

[0107] Each power P is analyzed as follows:

[0108] P (engine power generation) should be used to stabilize the engine speed as much as possible to suppress engine efficiency loss; in particular, the engine and generator speeds should be kept in the high-efficiency range as much as possible.

[0109] P (battery charging or discharging power) should minimize the amount of charging or discharging the battery to reduce charging and discharging efficiency loss.

[0110] P (drive power demand) is related to user usage and will not be analyzed.

[0111] P (power of electrical appliances and accessories) is related to the vehicle's configuration and functions, and will not be analyzed.

[0112] In this application, P (battery charging or discharging power) should minimize battery charging or discharging to reduce charging and discharging efficiency loss. To ensure that P (battery charging or discharging power) minimizes battery charging or discharging, more speed points are selected to get closer to zero charging and zero discharging. However, this contradicts the goal of reducing the number of speed points for fixed-point power generation. Therefore, the number of speed points to select must be considered: when there are few speed points, to ensure that the battery is not depleted, the power generation at most vehicle speeds is too high, resulting in charging and discharging efficiency loss. When there are many speed points, the rapid change in speed and the efficiency loss of the engine must be considered. These two factors need to be calculated and balanced, and the specific results should be based on experimental comparisons. In addition, the overall vehicle NVH evaluation at the selected speeds also needs to be considered.

[0113] This application starts from the relationship between engine fuel consumption and transient and steady-state speed, and through calibration strategy, aims to keep the engine in steady-state speed condition as much as possible, thereby achieving fuel economy in series mode of hybrid vehicles.

[0114] In some embodiments, the target engine speed value determination module is used for

[0115] Based on the target vehicle speed when the vehicle is traveling within the target speed range, select the engine speed value among the plurality of engine speed values ​​whose output power generation is closest to the drive demand power corresponding to the target vehicle speed;

[0116] The engine speed value whose output power is closest to the driving power required at the target vehicle speed is taken as the target engine speed value for driving the vehicle at the target vehicle speed.

[0117] In this exemplary embodiment, Table 1 is a table of engine speed values. As shown in Table 1, one engine speed corresponds to one power output and one target vehicle speed. When the target vehicle speed is between D and E, the corresponding engine speed can be the second speed. That is, when the target vehicle speed is D, the output power output corresponding to the second engine speed is closest to the drive demand power corresponding to the target vehicle speed D, and at this time, the target engine speed value is determined to be the second speed.

[0118] In some embodiments, the engine speed value determination module is used for

[0119] The driving power demand range is divided into multiple power range segments;

[0120] Determine a drive demand power within one of the power ranges;

[0121] Based on the multiple different drive demand power, and according to the overall efficiency distribution of the engine and generator, multiple engine speed values ​​corresponding to the overall efficiency of the engine and generator exceeding the predetermined threshold are determined.

[0122] In this exemplary embodiment, the engine speed corresponding to the required power is segmented, and a fixed speed is assigned to each power segment. The engine speed is stable within each power segment, thereby reducing fuel consumption accordingly.

[0123] This disclosure provides a computer-readable storage medium storing a driving control program for a hybrid vehicle in series mode. When the driving control program for a hybrid vehicle in series mode is executed by a processor, it implements the driving control method for a hybrid vehicle in series mode described in the above embodiments.

[0124] This disclosure provides a control system including a memory, a processor, and a driving control program for a hybrid vehicle in series mode stored in the memory and executable on the processor. When the processor executes the driving control program for the hybrid vehicle in series mode, it implements the driving control method for the hybrid vehicle in series mode described in the above embodiments.

[0125] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0126] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0127] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0129] Furthermore, the terms "first," "second," etc., used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this disclosure can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this disclosure, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0130] In this disclosure, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing," etc., appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific implementation.

[0131] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0132] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A driving control method for a hybrid vehicle in series mode, characterized in that, include: Based on the target speed range of the vehicle when driving in series mode, determine the corresponding drive power range required to drive the vehicle when driving within the target speed range. Based on the overall efficiency distribution of the engine and generator, and according to multiple different drive demand power within the drive demand power range, multiple engine speed values ​​corresponding to the overall efficiency of the engine and generator exceeding a predetermined threshold are determined; wherein, one drive demand power corresponds to one engine speed value; based on the target vehicle speed when the vehicle is driving within the target speed range, one engine speed value is selected from the multiple engine speed values ​​as the target engine speed value; the engine is controlled to operate at the target engine speed value to output power generation and drive the vehicle; the determination of multiple engine speed values ​​corresponding to the overall efficiency of the engine and generator exceeding a predetermined threshold based on the overall efficiency distribution of the engine and generator and according to multiple different drive demand power within the drive demand power range includes: obtaining test results obtained by driving the vehicle within the target speed range with the minimum fuel consumption as the test objective; based on the test results, determining the engine speed value corresponding to the minimum fuel consumption within the multiple engine speed values; and using the engine speed value corresponding to the minimum fuel consumption as the engine speed value used by the engine to output power generation when the vehicle is driving within the target speed range.

2. The driving control method for hybrid vehicles in series mode according to claim 1, characterized in that, The step of selecting an engine speed value as the target engine speed value from among the plurality of engine speed values ​​based on the target vehicle speed when the vehicle is traveling within the target speed range includes: selecting the engine speed value from among the plurality of engine speed values ​​whose output power generation is closest to the drive demand power corresponding to the target vehicle speed based on the target vehicle speed when the vehicle is traveling within the target speed range; and using the engine speed value whose output power generation is closest to the drive demand power corresponding to the target vehicle speed as the target engine speed value for the engine to drive the vehicle at the target vehicle speed.

3. A driving control device for a hybrid vehicle in series mode, implementing the driving control method for a hybrid vehicle in series mode as described in any one of claims 1-2, characterized in that, include: The power range determination module is used to determine the driving power demand range corresponding to driving the vehicle within the target speed range based on the target speed range when the vehicle is driving in series mode; the engine speed value determination module is used to determine multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding a predetermined threshold based on the combined efficiency distribution of the engine and generator and multiple different driving power demands within the driving power demand range; wherein, one driving power demand corresponds to one engine speed value; the target engine speed value determination module is used to select one engine speed value as the target engine speed value from the multiple engine speed values ​​based on the target speed of the vehicle when driving within the target speed range; An engine control module is used to control the engine to operate at the target engine speed and output power to drive the vehicle.

4. The driving control device for hybrid vehicles in series mode according to claim 3, characterized in that, The engine speed determination module is used to obtain test results obtained by driving the vehicle within the target speed range with the minimum fuel consumption as the test objective; based on the test results, determine the engine speed value corresponding to the minimum fuel consumption within the multiple engine speed values; and use the engine speed value corresponding to the minimum fuel consumption as the engine speed value used by the engine to output power generation when the vehicle is driving within the target speed range.

5. The driving control device for a hybrid vehicle in series mode according to claim 3, characterized in that, The target engine speed value determination module is used to select, from the plurality of engine speed values, the engine speed value whose output power generation is closest to the drive demand power corresponding to the target vehicle speed, based on the target vehicle speed when the vehicle is driving within the target vehicle speed range. The engine speed value whose output power is closest to the driving power required at the target vehicle speed is taken as the target engine speed value for driving the vehicle at the target vehicle speed.

6. The driving control device for a hybrid vehicle in series mode according to claim 3, characterized in that, The engine speed value determination module is used to divide the drive demand power range into multiple power range segments; determine a drive demand power within a power range segment; and, based on the multiple different drive demand powers, determine multiple engine speed values ​​corresponding to the combined efficiency of the engine and generator exceeding the predetermined threshold according to the combined efficiency distribution of the engine and generator.

7. A computer-readable storage medium, characterized in that, It stores a driving control program for a hybrid vehicle in series mode. When the processor executes the driving control program for a hybrid vehicle in series mode, it implements the driving control method for a hybrid vehicle in series mode as described in any one of claims 1-2.

8. A control system, characterized in that, The system includes a memory, a processor, and a driving control program for a hybrid vehicle in series mode stored in the memory and executable on the processor. When the processor executes the driving control program for the hybrid vehicle in series mode, it implements the driving control method for a hybrid vehicle in series mode as described in any one of claims 1-2.

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