Range extender control method, device and hybrid electric vehicle

Abstract

The present application discloses a range extender control method, device and hybrid vehicle, and relates to the technical field of hybrid vehicle manufacturing. The range extender control method includes obtaining road driving conditions; determining the expected parking time according to the road driving conditions; if the expected parking time is not less than a first preset time threshold, obtaining the real-time driving motor speed of the vehicle; if the driving motor speed is 0, obtaining the current first power value of the vehicle battery; if the first power value is lower than the preset power threshold, controlling the range extender to generate electricity according to preset parameters. This method solves the problem in the prior art that the NVH performance of the vehicle decreases when it is in a frequent start-stop condition, resulting in a poor user experience.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid vehicle manufacturing, and in particular to a range extender control method, device and hybrid vehicle. Background Art

[0002] With the continuous development of society, people's demand for cars is increasing. Due to the increasingly serious energy shortage and environmental pollution caused by traditional cars, electric vehicles powered by electricity have come into being. Hybrid vehicles can solve the mileage anxiety problem of electric vehicles through the use of range extenders.

[0003] At present, due to safety considerations, the number of traffic lights in various cities is also increasing rapidly, and many red lights last too long. Cars may have to start and stop for a long time, and when the red light turns green and the speed needs to be increased quickly, the speed of the range extender will also increase rapidly in a short time. This will cause the car's NVH (Noise, Vibration, Harshness) performance to decline, resulting in a poor user experience.

[0004] Therefore, the above problems need to be solved urgently. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a range extender control method, device and hybrid vehicle to solve the problem in the prior art that NVH performance decreases when the vehicle is in a frequent start-stop condition, resulting in a poor user experience.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of the present application provides a range extender control method, the method comprising:

[0008] Obtain road driving conditions;

[0009] Determine the expected parking time based on road driving conditions;

[0010] If the expected parking time is not less than the first preset time threshold, obtaining the real-time driving motor speed of the vehicle;

[0011] If the driving motor speed is 0, obtain the current first power value of the vehicle battery;

[0012] If the first power value is lower than the preset power threshold, the range extender is controlled to generate electricity according to preset parameters.

[0013] In some embodiments, the aforementioned range extender control method, wherein if the first power value is lower than a preset power threshold, the range extender is controlled to generate power according to preset parameters, the method includes: if the first power value is lower than the preset power threshold, the range extender is controlled to generate power according to the preset parameters so that the power generation time is greater than or equal to the minimum operating time of the range extender.

[0014] In some embodiments, the aforementioned range extender control method, wherein the power generation duration of the range extender is controlled according to preset parameters to be greater than or equal to the minimum operating time of the range extender, the method further includes obtaining a real-time second power value of the vehicle battery when the real-time drive motor speed of the vehicle is greater than 0; and controlling the range extender to generate power according to the preset parameters until the second power value is equal to the first power value.

[0015] In some embodiments, the aforementioned range extender control method, wherein if the drive motor speed is 0, the current first power value of the vehicle battery is obtained, the method includes: if the drive motor speed is 0, obtaining the parking time of the vehicle when the drive motor speed is 0, if the parking time is not less than the second preset time threshold, obtaining the current first power value of the vehicle battery.

[0016] In some embodiments, the aforementioned range extender control method, wherein the range extender is controlled to generate electricity according to preset parameters, includes controlling the speed of the engine of the range extender according to the maximum speed limit of the engine.

[0017] In some embodiments, the aforementioned range extender control method, wherein the range extender is controlled to generate electricity according to preset parameters, further includes controlling the power generation power of the generator of the range extender according to the maximum power generation power of the generator.

[0018] In some embodiments, the aforementioned range extender control method, in which the range extender is controlled to generate electricity according to preset parameters until the second power value is equal to the first power value, the method also includes adjusting the power generation power of the range extender according to the power demand of the whole vehicle so that the power generation power of the range extender follows the power demand of the whole vehicle.

[0019] In some embodiments, the aforementioned range extender control method, before obtaining the current first power value of the vehicle battery and the real-time driving motor speed of the vehicle, the method also includes adjusting the power generation power of the range extender according to the power demand of the entire vehicle.

[0020] A second aspect of the present application provides a range extender control device, comprising:

[0021] A first acquisition module, used for acquiring road driving conditions;

[0022] A determination module, used to determine the expected parking time according to the road driving conditions;

[0023] A second acquisition module is used to acquire a real-time driving motor speed of the vehicle if the expected parking time is not less than a first preset time threshold;

[0024] A third acquisition module is used to acquire a current first power value of the vehicle battery if the speed of the driving motor is 0;

[0025] The control module is used to control the range extender to generate electricity according to preset parameters if the first power value is lower than a preset power threshold.

[0026] A third aspect of the present application provides a hybrid vehicle, comprising the above-mentioned range extender control device.

[0027] By means of the above technical solution, the range extender control method, device and hybrid vehicle of the present application have at least the following advantages:

[0028] The first aspect of the present application provides a range extender control method, the method comprising obtaining road driving conditions; determining the expected parking time according to the road driving conditions; if the expected parking time is not less than a first preset time threshold, obtaining the real-time driving motor speed of the vehicle; if the driving motor speed is 0, obtaining the current first power value of the vehicle battery; if the first power value is lower than the preset power threshold, controlling the range extender to generate electricity according to preset parameters. The present application obtains the road driving conditions during the driving of the vehicle, so as to determine the expected parking time that the vehicle needs to stop and wait at the next traffic light intersection to be reached according to different road driving conditions. The present application is provided with a first preset time threshold, so as to compare and judge the expected parking time with the first preset time threshold, so as to avoid the frequent start and stop of the range extender in a short period of time affecting the NVH performance of the vehicle, and at the same time improve the economy of the range extender's power generation. When the expected parking time reaches not less than the first preset time threshold, the present application monitors the driving state of the car by acquiring the real-time driving motor speed of the car. When the driving motor speed is 0, it can be judged that the car has arrived at the traffic light intersection and stopped. At this time, the current first power value of the car battery at the moment when the driving motor speed is 0 is acquired. When the first power value is lower than the preset power threshold, it can be judged that the car battery needs to be charged. The present application controls the car range extender under the parking condition by preset parameters, so that the range extender can generate electricity in a fixed condition with good NVH performance to ensure the driving experience of the car, and the control intervention of the preset parameters enables the range extender to avoid the rapid change of the range extender speed when the car stops at a red light and accelerates quickly at a green light, thereby effectively improving the NVH performance of the car under the traffic light condition. Through the application of the present application, the problem of poor experience caused by the decline of NVH performance of the car under the condition of frequent start-stop in the prior art is solved.

[0029] The range extender control device provided in the second aspect of the present application and the hybrid vehicle provided in the third aspect have the same or similar technical effects as the range extender control method provided in the first aspect of the present application.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0032] Figure 1 A schematic diagram of a flow chart of a range extender control method provided in an embodiment of the present application is schematically shown;

[0033] Figure 2 A schematic diagram of a flow chart of another range extender control method provided in an embodiment of the present application is schematically shown;

[0034] Figure 3 A schematic diagram of a flow chart of another range extender control method provided in an embodiment of the present application is schematically shown;

[0035] Figure 4 The structural diagram of a range extender control device provided in an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0036] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0037] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0038] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0039] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. All terms used in this application have the same meaning as understood by ordinary technicians in the field to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined here.

[0040] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0041] Embodiment 1

[0042] like Figure 1 As shown, the first aspect of the present application provides a range extender control method, the method comprising:

[0043] S1. Obtaining road driving conditions;

[0044] Specifically, the range extender control method provided in the present application first obtains the road driving conditions to ensure that the control strategy is executed under economically feasible conditions. The road driving conditions may include traffic information at the traffic light intersection ahead, the distribution of traffic light countdown time at the traffic light intersection ahead, the current traffic light countdown number at the traffic light intersection ahead, the congestion situation of the road section before reaching the traffic light intersection ahead or whether an accident has occurred, the driving distance and estimated driving time to reach the traffic light intersection ahead, and other information. The road driving conditions can be comprehensively acquired through on-board sensors that can integrate and collect environmental information, map data, GPS (Global Positioning System) and the like within a certain range, or through a vehicle networking system that communicates between the car and the Internet, or an integrated automatic driving system as mentioned above.

[0045] S2. Determine the expected parking time according to the road driving conditions;

[0046] Specifically, in order to avoid the frequent start and stop of the range extender in a short period of time affecting the NVH performance of the vehicle, and to improve the economy of the range extender's power generation, the control strategy of this application needs to determine the expected parking time based on the acquired road driving conditions. The expected parking time of the car when it faces the next traffic light intersection can be estimated through the built-in analysis and processing calculation module through the above-mentioned vehicle-mounted sensors, vehicle networking systems, automatic driving systems, etc. that acquire the road driving conditions. In the calculation process of the expected parking time, the traffic light countdown time distribution duration, the current indicator light color and the current countdown time of the next traffic light intersection can be first obtained according to the road driving conditions, and the remaining driving time of the car from the current position to the next traffic light intersection can be estimated according to the road driving conditions. Here, it can be divided into four situations: the first is that if the next traffic light intersection is a red light, and the current countdown time minus the remaining driving time is a positive number, it is the expected parking time; the second is that if the next traffic light intersection is a red light, and the current If the countdown time minus the remaining driving time is a negative number, the car can pass through the green light when it arrives at the intersection, and there is no need to generate electricity according to the control strategy of this application; the third type is that if the light at the next traffic light intersection is green, and the current countdown time minus the remaining driving time is a positive number, the car can pass through the green light when it arrives at the intersection, and there is no need to generate electricity according to the control strategy of this application; the fourth type is that if the light at the next traffic light intersection is green, and the current countdown time minus the remaining driving time is a negative number, then the negative number is added to the number of red light times in the countdown time distribution of the traffic light intersection, which is the expected parking time.

[0047] In order to have a clearer explanation of the above four situations, the data is assumed here for example. For example, the next traffic light intersection faced by the car during driving becomes the target intersection, and the traffic light countdown time distribution of the target intersection is 30s for red light and 45s for green light. According to the road driving conditions, the remaining driving time of the car from the current position to the target intersection is estimated to be 20s. In the first case, the target intersection is a red light and the reading is 28s, then the expected parking time is 28s minus 20s, that is, 8s; in the second case, the target intersection is a red light and the reading is 16s, then the car arrives at the target intersection with a green light of 41s, and there is no need to generate electricity according to the control strategy of this application; in the third case, the target intersection is a green light and the reading is 30s, then the car arrives at the target intersection with a green light of 10s, and there is no need to generate electricity according to the control strategy of this application; in the fourth case, the target intersection is a green light and the reading is 13s, then the car arrives at the target intersection with a red light of 23s, that is, the expected parking time is 23s. The above embodiments are merely examples for clearly explaining how to determine the expected parking duration.

[0048] S3. If the expected parking time is not less than the first preset time threshold, obtaining the real-time driving motor speed of the vehicle;

[0049] Specifically, the present application is provided with a first preset time threshold value, so as to compare and judge the expected parking time with the first preset time threshold value. The specific value of the first preset time threshold value is set according to actual needs, and the present application is not limited. For example, in one embodiment, the first preset time threshold value is 10 seconds, and the expected parking time is determined to be 6 seconds based on the road driving conditions. If the expected parking time is less than the first preset time threshold value, it can be judged that the parking time of the car is too short when facing the next traffic light intersection, and the subsequent control strategy of the present application is not performed to avoid frequent starting and stopping of the range extender in a short time. In another embodiment, the first preset time threshold value is 9 seconds, and the expected parking time is determined to be 12 seconds based on the road driving conditions. If the expected parking time is greater than the first preset time threshold value, it can be judged that the car has a longer parking time when facing the next traffic light intersection, and the subsequent control strategy of the present application can be performed.

[0050] When the expected parking time determined by obtaining the road driving conditions meets the condition of being not less than the first preset time threshold, the control method of the present application monitors the state of the car during driving in real time to obtain the real-time driving motor speed of the car, so as to obtain the information that the car arrives at the traffic light intersection ahead and stops based on the data information of the driving motor speed, so as to perform subsequent judgment and control.

[0051] S4. If the speed of the driving motor is 0, obtain the current first power value of the vehicle battery;

[0052] Specifically, when the driving motor speed is 0, it can be determined that the car has reached the traffic light intersection and stopped. In order to determine whether the car battery needs to be charged in the current state, the present application obtains the current first power value of the car battery when the driving motor speed is 0.

[0053] S5. If the first power value is lower than a preset power threshold, control the range extender to generate power according to preset parameters.

[0054] Specifically, if the first power value is lower than the preset power threshold, it can be known that the car battery has a charging demand, and at this time the car is in a stable parking state under a red light and has a charging demand. In order to enable the range extender to generate electricity in a fixed condition with good NVH performance and ensure the driving experience of the car, the present application controls the range extender to generate electricity according to preset parameters. The range extender is composed of an engine and a generator. The generator converts the mechanical energy output by the engine into electrical energy to charge the car battery. The preset parameters in the present application may include the speed of the generator, or both the speed of the generator and the power generation of the generator. The specific values ​​in the preset parameters are the corresponding parameter values ​​obtained after tuning based on the corresponding vehicle model that can make the car NVH perform well. And the present application enables the range extender to avoid the rapid change of the range extender speed when the car stops at a red light and accelerates quickly at a green light through the control intervention of the preset parameters, thereby effectively improving the NVH performance of the car under traffic light conditions.

[0055] It should be noted that before and after executing the control method provided in this application, the control strategy of the range extender of the car can be returned to the control strategy in the conventional driving scene, including but not limited to the rule-based fixed-point power generation control strategy, the power following control strategy or the combination of the above two. Under the fixed-point power generation control strategy, different working modes can be divided for different types of hybrid vehicles, such as pure electric working mode, power balance power generation mode, power compensation power generation mode and forced charging mode. In the process of the battery power of the car battery from high to low, the above four modes are respectively operated, wherein the pure electric operation mode means that the range extender does not work and the wheels are driven only by the battery; the power balance power generation mode means that when the battery power is high, the range extender provides a smaller power generation to keep the battery power within a certain range; the power compensation mode means that when the battery power is low, the range extender provides a higher power generation to increase the battery power; the forced charging mode means that when the battery power is very low, the range extender uses the highest power generation to quickly increase the battery power. Under the power following strategy, the range extender can dynamically adjust the power generation power of the range extender according to the current power request of the car, that is, the situation of the driver stepping on the accelerator pedal, the state of charge of the battery pack, and the current vehicle speed. When the car needs more power, the range extender increases its output accordingly. Conversely, when the car's power demand is lower, the range extender reduces its output to save fuel energy.

[0056] The first aspect of the present application provides a range extender control method, the method comprising obtaining road driving conditions; determining the expected parking time according to the road driving conditions; if the expected parking time is not less than a first preset time threshold, obtaining the real-time driving motor speed of the vehicle; if the driving motor speed is 0, obtaining the current first power value of the vehicle battery; if the first power value is lower than the preset power threshold, controlling the range extender to generate electricity according to preset parameters. The present application obtains the road driving conditions during the driving of the vehicle, so as to determine the expected parking time that the vehicle needs to stop and wait at the next traffic light intersection to be reached according to different road driving conditions. The present application is provided with a first preset time threshold, so as to compare and judge the expected parking time with the first preset time threshold, so as to avoid the frequent start and stop of the range extender in a short period of time affecting the NVH performance of the vehicle, and at the same time improve the economy of the range extender's power generation. When the expected parking time reaches not less than the first preset time threshold, the present application monitors the driving state of the car by acquiring the real-time driving motor speed of the car. When the driving motor speed is 0, it can be judged that the car has arrived at the traffic light intersection and stopped. At this time, the current first power value of the car battery at the moment when the driving motor speed is 0 is acquired. When the first power value is lower than the preset power threshold, it can be judged that the car battery needs to be charged. The present application controls the car range extender under the parking condition by preset parameters, so that the range extender can generate electricity in a fixed condition with good NVH performance to ensure the driving experience of the car, and the control intervention of the preset parameters enables the range extender to avoid the rapid change of the range extender speed when the car stops at a red light and accelerates quickly at a green light, thereby effectively improving the NVH performance of the car under the traffic light condition. Through the application of the present application, the problem of poor experience caused by the decline of NVH performance of the car under the condition of frequent start-stop in the prior art is solved.

[0057] like Figure 2 As shown, in some embodiments, if the first power value is lower than a preset power threshold, the range extender is controlled to generate power according to preset parameters. The method includes: if the first power value is lower than the preset power threshold, the range extender is controlled to generate power according to the preset parameters so that the power generation time is greater than or equal to the minimum operating time of the range extender.

[0058] Specifically, in order to further avoid frequent starting and stopping of the range extender in a short period of time and improve the economy of the range extender in power generation under red light conditions under the control strategy of this application, the range extender of this application is provided with a minimum operating time, and the minimum operating time of the range extender is set based on the standard that enables the automobile NVH performance to be good after tuning the corresponding vehicle model, and is not limited to the specific conditions, as long as it can ensure that the control of this application satisfies the expected parking time not less than the first preset time threshold, the drive motor speed is 0, and the first power value is lower than the preset power threshold, so that the power generation of the range extender under the control strategy of this application has good economy and NVH performance.

[0059] like Figure 3 As shown, in some embodiments, after the power generation time of the range extender is controlled to be greater than or equal to the minimum operating time of the range extender according to the preset parameters, the method further includes:

[0060] S6. When the real-time driving motor speed of the vehicle is greater than 0, obtaining a real-time second power value of the vehicle battery;

[0061] Specifically, in order to increase the time that the range extender can generate electricity in a fixed operating condition with good NVH performance, in the range extender control method of the present application, when the real-time drive motor speed of the vehicle is greater than 0, that is, when the vehicle switches from a red light operating condition to a green light operating condition, the real-time second power value of the vehicle battery is obtained, that is, the second power value that the vehicle increases to after charging on the basis of the first power value during the red light time is obtained, and the vehicle starts to gradually start driving.

[0062] S7. Control the range extender to generate electricity according to preset parameters until the second power value is equal to the first power value.

[0063] Specifically, in order to increase the time that the range extender can generate electricity in a fixed working condition with good NVH performance, in the range extender control method of the present application, the present application controls the range extender to generate electricity until the second power value is equal to the first power value according to preset parameters. This design enables the range extender to generate electricity in a fixed working condition with good NVH performance for a longer time under the control intervention of the preset parameters, and also avoids rapid changes in the range extender speed under the green light starting and acceleration conditions of the vehicle, thereby effectively improving the NVH performance of the vehicle under traffic light conditions. In one embodiment, a first power value of the vehicle battery is obtained when the vehicle stops at a red light, which is 25%. After a period of time, the range extender is controlled to generate electricity according to preset parameters. When the traffic light turns from red to green, the real-time second power value of the vehicle battery after the red light ends is obtained to be 30%. The vehicle starts to start and accelerate at the green light. At this time, the range extender is still controlled to generate electricity according to the preset parameters until the second power value is equal to 25%. At this time, the range extender can generate electricity in a fixed condition with good NVH performance, avoiding rapid changes in the range extender speed. When the second power value of the range extender is equal to 25%, the control intervention of the preset parameters is exited, and the vehicle can use control strategies such as fixed-point power generation control strategy and power following control strategy to control the subsequent range extender during driving, without limitation.

[0064] In some embodiments, if the driving motor speed is 0, the current first power value of the vehicle battery is obtained. The method includes: if the driving motor speed is 0, obtaining the parking time of the vehicle when the driving motor speed is 0; if the parking time is not less than a second preset time threshold, obtaining the current first power value of the vehicle battery.

[0065] Specifically, in order to ensure the economy of the range extender to generate electricity according to the control strategy of this application, considering that the driving scene may face a short parking time, if the frequent start and stop of the range extender at this time affects the NVH performance of the vehicle and the economy of the range extender power generation, if the driving motor speed is 0, the method for obtaining the current first power value of the vehicle battery in this application also needs to obtain the parking time of the vehicle when the driving motor speed is 0, and a second preset time threshold is set. As long as the driving motor speed is 0, the car is in a parking or parking state, and the parking time is not less than the second preset time threshold, the preset parameters are intervened to control the range extender to generate electricity. The second preset time threshold and the first preset time threshold jointly ensure that the car can generate electricity with the range extender at an appropriate time, providing dual judgment and guarantee for the control strategy of this application. The specific value of the second preset time threshold is set according to actual needs, and this application is not limited. In one embodiment, the second preset time threshold is 3s. According to the current parking time of the car obtained, only when the parking time is not less than 3s, the preset parameters are intervened to control the range extender to generate electricity, thereby improving the economy of the range extender power generation.

[0066] In some embodiments, controlling the range extender to generate electricity according to preset parameters includes controlling the speed of the engine of the range extender according to a maximum speed limit of the engine.

[0067] Specifically, in order to enable the range extender to generate electricity in a fixed condition with good NVH performance and ensure the driving experience of the car, the present application uses the control intervention of preset parameters to enable the range extender to avoid the rapid change of the range extender speed when the car stops at a red light and accelerates quickly at a green light, thereby effectively improving the NVH performance of the car under traffic light conditions. Controlling the range extender to generate electricity according to preset parameters includes controlling the speed of the engine of the range extender according to the maximum speed limit of the engine, so that the first power value is lower than the preset power threshold, and when the speed of the drive motor is 0, the present application controls the engine speed through the preset maximum speed limit of the engine, so that the engine works in a high-efficiency range, and at the same time, it works under conditions with good NVH performance, reducing noise and vibration during operation.

[0068] In some embodiments, controlling the range extender to generate electricity according to preset parameters further includes controlling the power generation of the generator of the range extender according to the maximum power generation power of the generator.

[0069] Specifically, on the basis of controlling the engine speed of the range extender, in order to enable the range extender to generate electricity in a fixed working condition with good NVH performance and ensure the driving experience of the car, the control of the range extender power generation according to preset parameters in this application also includes controlling the power generation power of the range extender generator according to the maximum power generation power of the generator, so that the generator works within its high-efficiency range, so that it can efficiently charge the car battery and maximize the energy conversion efficiency. It should be noted that the power generation power of the generator can be controlled to match the engine speed to ensure that the range extender is in an efficient state to improve the conversion efficiency of mechanical energy to electrical energy.

[0070] In some embodiments, after controlling the range extender to generate electricity according to preset parameters until the second power value is equal to the first power value, the method also includes adjusting the power generation power of the range extender according to the power demand of the entire vehicle so that the power generation power of the range extender follows the power demand of the entire vehicle.

[0071] Specifically, in the range extender control method of the present application, after the range extender is controlled to generate electricity according to preset parameters until the second power value is equal to the first power value, the power generation power of the range extender is adjusted according to the power demand of the whole vehicle, so that the power generation power of the range extender follows the power demand of the whole vehicle. That is, after the second power value is equal to the first power value, and the power value generated by the range extender under the preset parameters is completely consumed, the present application adopts a power following control strategy, which aims to dynamically adjust the power generation power of the range extender so that it follows the actual power demand changes of the vehicle, so as to improve the energy utilization rate of the vehicle and ensure that the range extender operates in a high-efficiency area.

[0072] Under the power following strategy, the range extender can dynamically adjust the power generation of the range extender according to the current power request of the car, that is, the situation of the driver stepping on the accelerator pedal, the charge state of the battery pack, and the current vehicle speed. When the car needs more power, the range extender increases the output accordingly. Conversely, when the car's power demand is low, the range extender reduces the output to save fuel energy. Furthermore, in order to improve the economy of the range extender process, the operating point of the range extender can be controlled within a preset high-efficiency range. In this embodiment, even if the power demand is low, the range extender still operates within the high-efficiency range to improve work efficiency.

[0073] In some embodiments, before obtaining the current first power value of the vehicle battery and the real-time driving motor speed of the vehicle, the method further includes adjusting the power generation power of the range extender according to the power demand of the entire vehicle.

[0074] Specifically, in the range extender control method of the present application, before obtaining the current first power value of the vehicle battery and the real-time driving motor speed of the vehicle, the power generation power of the range extender is adjusted according to the power demand of the vehicle. That is, when the first power value is lower than the preset power threshold and the driving motor speed is 0, before controlling the range extender to generate power according to the preset parameters, the present application adopts a power following control strategy, which aims to dynamically adjust the power generation power of the range extender so that it follows the actual power demand changes of the vehicle, so as to improve the energy utilization rate of the vehicle and ensure that the range extender works in the high-efficiency area.

[0075] Embodiment 2

[0076] like Figure 4 As shown, the second aspect of the present application provides a range extender control device, comprising:

[0077] The first acquisition module 101 is used to acquire road driving conditions.

[0078] Specifically, in one embodiment of the present application, the first acquisition module 101 includes but is not limited to vehicle-mounted sensors that can integrate and collect environmental information, map data, GPS (Global Positioning System) and the like within a certain range, or a vehicle networking system that communicates with the Internet through a car, or an automatic driving system integrated with the above-mentioned system, etc., to acquire road driving conditions including traffic information at the traffic light intersection ahead, the distribution of traffic light countdown time at the traffic light intersection ahead, the current traffic light countdown number at the traffic light intersection ahead, congestion in the road section before reaching the traffic light intersection ahead or whether an accident has occurred, the driving distance to the traffic light intersection ahead and the estimated driving time, so as to ensure the economic feasibility of the control strategy.

[0079] The determination module 102 is used to determine the expected parking time according to the road driving conditions.

[0080] Specifically, the determination module 102 can determine the expected parking time according to the road driving conditions. The determination module 102 can be a built-in analysis and processing calculation module of the above-mentioned vehicle-mounted sensors, vehicle networking systems, automatic driving systems, etc., which estimates the expected parking time when the car faces the next traffic light intersection. In the process of calculating the expected parking time, the traffic light countdown time distribution duration, the current indicator light color and the current countdown time of the next traffic light intersection can be first obtained according to the road driving conditions, and the remaining driving time from the current position to the next traffic light intersection is estimated according to the road driving conditions. Here, it can be divided into four situations: the first is that if the next traffic light intersection is a red light, and the current countdown time minus the remaining driving time is a positive number, which is the expected parking time; the second is that if the next traffic light intersection is a red light, and the current If the countdown time minus the remaining travel time is a negative number, the car can pass through the intersection with a green light, and there is no need to generate electricity according to the control strategy of this application; the third type is that if the next traffic light intersection is green, and the current countdown time minus the remaining travel time is a positive number, the car can pass through the intersection with a green light, and there is no need to generate electricity according to the control strategy of this application; the fourth type is that if the next traffic light intersection is green, and the current countdown time minus the remaining travel time is a negative number, then the negative number is added to the number of red light times in the countdown time distribution of the traffic light intersection, which is the expected parking time. The analysis and processing calculation module can calculate the expected parking time based on the above four situations.

[0081] The second acquisition module 103 is used to acquire the real-time driving motor speed of the vehicle if the expected parking time is not less than the first preset time threshold.

[0082] Specifically, in order to avoid frequent start and stop of the range extender in a short period of time, the expected parking time is compared with the first preset time threshold value. When the expected parking time determined by obtaining the road driving condition satisfies the condition of not less than the first preset time threshold value, the second acquisition module 103 can obtain the speed of the driving motor of the car in real time, so as to obtain the information that the car arrives at the traffic light intersection ahead and stops according to the data information of the driving motor speed. The second acquisition module 103 can be an MCU (Motor Control Unit) mounted on the car, etc.

[0083] The third acquisition module 104 is used to acquire a current first power value of the vehicle battery if the speed of the driving motor is 0.

[0084] Specifically, when the driving motor speed is 0, it can be determined that the car has arrived at the traffic light intersection and stopped. In order to determine whether the car battery needs to be charged in the current state, the present application is provided with a third acquisition module 104. The third acquisition module 104 can be a BMS (Battery Management System) installed on the car, etc., which can obtain the current first power value of the car battery at the moment when the driving motor speed is 0.

[0085] The control module 105 is configured to control the range extender to generate electricity according to preset parameters if the first power value is lower than a preset power threshold.

[0086] Specifically, in order to enable the range extender to generate electricity in a fixed working condition with good NVH performance and ensure the driving experience of the car, the present application is provided with a control module 105 to control the range extender to generate electricity according to preset parameters. The control module 105 includes but is not limited to VCU (Vehicle Control Unit), EMS (Engine Management System) and GCU (Generator Control Unit), etc. In one embodiment, the VCU determines the maximum speed limit of the engine, and the EMS controls the engine speed of the range extender according to the preset maximum speed limit of the engine; in another embodiment, the VCU simultaneously determines the maximum speed limit of the engine and the maximum power generation power of the generator, the EMS controls the engine speed of the range extender according to the preset maximum speed limit of the engine, and the GCU controls the power generation power of the generator of the range extender according to the preset maximum power generation power of the generator, so that the range extender can generate electricity in a fixed condition with good NVH performance to ensure the driving experience of the car, and the control intervention of the preset parameters enables the range extender to avoid the rapid change of the range extender speed when the car stops at a red light and accelerates quickly at a green light, thereby effectively improving the NVH performance of the car under traffic light conditions.

[0087] The second aspect of the present application provides a range extender control device, the device includes a first acquisition module 101, a determination module 102, a second acquisition module 103, a third acquisition module 104 and a control module 105, the first acquisition module 101 is used to acquire road driving conditions; the determination module 102 is used to determine the expected parking time according to the road driving conditions; the second acquisition module 103 is used to acquire the real-time driving motor speed of the car if the expected parking time is not less than the first preset time threshold; the third acquisition module 104 is used to acquire the current first power value of the car battery if the driving motor speed is 0; the control module 105 is used to control the range extender to generate electricity according to preset parameters if the first power value is lower than the preset power threshold. The present application acquires the road driving conditions during the driving of the car, so as to determine the expected parking time that the car needs to stop and wait at the next traffic light intersection to be reached according to different road driving conditions. The present application is provided with a first preset time threshold, so as to compare and judge the expected parking time with the first preset time threshold, so as to avoid the frequent start and stop of the range extender in a short time to affect the NVH performance of the vehicle, and at the same time improve the economy of the range extender power generation. When the expected parking time reaches not less than the first preset time threshold, the present application monitors the driving state of the car by acquiring the real-time driving motor speed of the car. When the driving motor speed is 0, it can be judged that the car has arrived at the traffic light intersection and stopped. At this time, the current first power value of the car battery at the moment when the driving motor speed is 0 is acquired. When the first power value is lower than the preset power threshold, it can be judged that the car battery needs to be charged. The present application controls the car range extender under the parking condition by preset parameters, so that the range extender can generate electricity in a fixed condition with good NVH performance to ensure the driving experience of the car, and the control intervention of the preset parameters enables the range extender to avoid the rapid change of the range extender speed when the car stops at a red light and accelerates quickly at a green light, thereby effectively improving the NVH performance of the car under the traffic light condition. Through the application of the present application, the problem of poor experience caused by the decline of NVH performance of the car under the condition of frequent start-stop in the prior art is solved.

[0088] Embodiment 3

[0089] A third aspect of the present application provides a hybrid electric vehicle, preferably a plug-in hybrid electric vehicle, comprising the above-mentioned range extender control device.

[0090] Specifically, please refer to the second embodiment for the specific structure of the range extender control device, which will not be described in detail here.

[0091] The range extender control method and range extender control device provided in the present application are applicable to different types of plug-in hybrid electric vehicles (PHEV), specifically, they can be applicable to parallel PHEVs in which the range extender can directly drive the wheels, they can also be applicable to extended-range vehicles in which the range extender only charges the battery, and they can also be hybrid PHEVs. As long as the range extender control method and device provided in the present application can be used for the above-mentioned different types of PHEVs, the NVH performance of the vehicle under traffic light conditions can be improved, and the driving experience can be improved.

[0092] A third aspect of the present application provides a hybrid electric vehicle, including a range extender control device, the range extender control device including a first acquisition module 101, a determination module 102, a second acquisition module 103, a third acquisition module 104 and a control module 105, the first acquisition module 101 is used to acquire road driving conditions; the determination module 102 is used to determine the expected parking time according to the road driving conditions; the second acquisition module 103 is used to acquire the real-time driving motor speed of the vehicle if the expected parking time is not less than a first preset time threshold; the third acquisition module 104 is used to acquire the current first power value of the vehicle battery if the driving motor speed is 0; the control module 105 is used to control the range extender to generate electricity according to preset parameters if the first power value is lower than the preset power threshold. The present application obtains road driving conditions during the driving of the car, so as to determine the expected parking time that the car needs to stop and wait at the next traffic light intersection to be arrived at according to different road driving conditions. The present application is provided with a first preset time threshold, so as to compare and judge the expected parking time with the first preset time threshold, so as to avoid the frequent starting and stopping of the range extender in a short period of time affecting the NVH performance of the vehicle, and at the same time improve the economy of the range extender's power generation. When the expected parking time reaches not less than the first preset time threshold, the present application monitors the driving state of the car by acquiring the real-time driving motor speed of the car. When the driving motor speed is 0, it can be judged that the car has arrived at the traffic light intersection and stopped. At this time, the current first power value of the car battery at the moment when the driving motor speed is 0 is acquired. When the first power value is lower than the preset power threshold, it can be judged that the car battery needs to be charged. The present application controls the car range extender under the parking condition by preset parameters, so that the range extender can generate electricity in a fixed condition with good NVH performance to ensure the driving experience of the car, and the control intervention of the preset parameters enables the range extender to avoid the rapid change of the range extender speed when the car stops at a red light and accelerates quickly at a green light, thereby effectively improving the NVH performance of the car under the traffic light condition. Through the application of the present application, the problem of poor experience caused by the decline of NVH performance of the car under the condition of frequent start-stop in the prior art is solved.

[0093] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A range extender control method, characterized in that: The method comprises: Obtain road driving conditions; Determining an expected parking duration according to the road driving conditions; If the expected parking time is not less than the first preset time threshold, obtaining the real-time driving motor speed of the vehicle; If the speed of the driving motor is 0, obtaining a current first power value of the vehicle battery; If the first power value is lower than a preset power threshold, the range extender is controlled to generate power according to preset parameters, and the power generation time of the range extender is controlled according to the preset parameters to be greater than or equal to the minimum operating time of the range extender; After controlling the power generation time of the range extender to be greater than or equal to the minimum operation time of the range extender according to the preset parameters, if the real-time speed of the driving motor of the vehicle is greater than 0, obtaining the real-time second power value of the vehicle battery; The range extender is controlled to generate electricity according to the preset parameters until the second power value is equal to the first power value.

2. The range extender control method according to claim 1, characterized in that: If the speed of the driving motor is 0, obtaining the current first power value of the vehicle battery, the method includes: If the speed of the driving motor is 0, the parking time of the car when the speed of the driving motor is 0 is obtained; if the parking time is not less than a second preset time threshold, the current first power value of the car battery is obtained.

3. The range extender control method according to claim 2, characterized in that: Control the range extender to generate electricity according to preset parameters, including: The speed of the engine of the range extender is controlled according to the maximum speed limit of the engine.

4. The range extender control method according to claim 3, characterized in that: Controlling the range extender to generate electricity according to preset parameters, and also including: The power generation power of the generator of the range extender is controlled according to the maximum power generation power of the generator.

5. The range extender control method according to any one of claims 1 to 4, characterized in that: After controlling the range extender to generate electricity according to the preset parameters until the second power value is equal to the first power value, the method further includes: The power generation power of the range extender is adjusted according to the power requirement of the whole vehicle, so that the power generation power of the range extender follows the power requirement of the whole vehicle.

6. The range extender control method according to claim 5, characterized in that: Before obtaining the current first power value of the vehicle battery and the real-time driving motor speed of the vehicle, the method further includes: The power generation power of the range extender is adjusted according to the power demand of the entire vehicle.

7. A range extender control device, characterized in that: include: A first acquisition module, used for acquiring road driving conditions; A determination module, used to determine the expected parking time according to the road driving condition; A second acquisition module is used to acquire a real-time driving motor speed of the vehicle if the expected parking time is not less than a first preset time threshold; A third acquisition module, configured to acquire a current first power value of the vehicle battery if the speed of the driving motor is 0; A control module, for controlling the range extender to generate electricity according to preset parameters if the first power value is lower than a preset power threshold, controlling the power generation time of the range extender to be greater than or equal to the minimum operating time of the range extender according to the preset parameters, and after controlling the power generation time of the range extender to be greater than or equal to the minimum operating time of the range extender according to the preset parameters, if the real-time driving motor speed of the vehicle is greater than 0, obtaining the real-time second power value of the vehicle battery, and controlling the range extender to generate electricity according to the preset parameters until the second power value is equal to the first power value.

8. A hybrid vehicle, characterized in that: include: The range extender control device as claimed in claim 7.

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