A hybrid vehicle forced power generation control method

Abstract

The application discloses a hybrid vehicle forced power generation control method, comprising: judging whether the condition of triggering the forced power generation function is met; if yes, determining the pre-output selected power generation power according to the size relationship between the battery allowed charging power and the first power generation power or the second power generation power, wherein the first power generation power is greater than the second power generation power; and determining the final output power generation power according to the size relationship between the sum of the battery allowed charging power and the accessory consumption power and the pre-output selected power generation power. The hybrid vehicle forced power generation control method can select different levels of power generation power according to the accelerator pedal depth, and the user can freely select according to the actual situation; the battery charging power capacity is considered, when the battery allowed charging power is low and the accessory consumption power is low, the power generation power is reduced to prevent the battery from being overcharged and damaged; and when the battery allowed charging power is particularly low, the forced power generation is not selected, and the battery is protected.

Description

Technical Field

[0001] This invention relates to the field of hybrid electric vehicle technology, and in particular to a forced power generation control method for hybrid vehicle models. Background Technology

[0002] Hybrid electric vehicles (HEVs) are cars with two or more power sources, typically an engine and a battery. Because electricity is cheaper and more environmentally friendly than gasoline, hybrid vehicles are designed with an electric-first principle. When the battery is fully charged, it is used to power the vehicle; when the battery is low, the engine generates electricity, which can be used to drive the vehicle or to recharge the battery, thus achieving fuel savings.

[0003] Since hybrid vehicles offer a driving experience closer to that of pure electric vehicles, battery charge has a significant impact on the user's driving experience. When the battery charge is too low, the vehicle's pure electric range decreases, resulting in a poorer driving experience. In certain special circumstances, the battery charge may drop, such as when the vehicle is stored in low temperatures, left unattended for extended periods, used for a long time without being switched off, or in remote / special environments where charging stations are unavailable. In these situations, the vehicle's user experience will also deteriorate.

[0004] Therefore, there is an urgent need for a forced power generation control method for hybrid vehicles, which uses the engine to quickly charge the battery to improve the driving experience. Summary of the Invention

[0005] The purpose of this invention is to provide a forced power generation control method for hybrid vehicles to solve the problems in the prior art. This method can achieve different levels of power generation while taking into account the battery charging power capability. When the battery's allowable charging power is low and the accessory power consumption is low, the method selects to reduce power generation to prevent overcharging of the battery and damage to the battery.

[0006] This invention provides a forced power generation control method for hybrid vehicles, comprising:

[0007] Determine whether the conditions for triggering the forced power generation function are met;

[0008] If satisfied, the pre-output power is determined based at least on the relationship between the battery's allowable charging power and the first or second power generation, wherein the first power generation is greater than the second power generation.

[0009] The final output power is determined based on the relationship between the sum of the battery's allowed charging power and the power consumed by the accessories and the power generated by the pre-selected output power.

[0010] In the hybrid vehicle forced power generation control method described above, preferably, the determination of whether the conditions for triggering the forced power generation function are met specifically includes:

[0011] The system determines whether the conditions for triggering the forced power generation function are met based on the gear position, state of charge (SOC), accelerator pedal depth, and holding time.

[0012] The hybrid vehicle forced power generation control method described above, preferably, includes determining whether the conditions for triggering the forced power generation function are met based on gear position, battery SOC, accelerator pedal depth, and holding time, specifically including:

[0013] The vehicle controller obtains gear position, battery SOC, and accelerator pedal depth from the CAN bus.

[0014] Determine if the following conditions are met simultaneously: the current gear is P, the battery SOC is less than the preset SOC threshold, the accelerator pedal depth is 100% and the holding time is greater than or equal to the preset time threshold. If so, the forced power generation function is triggered; otherwise, the forced power generation function cannot be triggered.

[0015] In the hybrid vehicle forced power generation control method described above, preferably, the preset SOC threshold is 80% and the preset time threshold is 1 second.

[0016] In the hybrid vehicle forced power generation control method described above, preferably, the pre-output selected power generation power includes a first power generation power, a second power generation power, or 0 kW.

[0017] The hybrid vehicle forced power generation control method described above, preferably, when the conditions for triggering the forced power generation function are met, the step of determining the pre-output selected power generation power based at least on the relationship between the battery's allowable charging power and a first power generation power or a second power generation power, wherein the first power generation power is greater than the second power generation power, specifically includes:

[0018] If the throttle opening is greater than the preset throttle opening threshold, and the battery's allowable charging power is greater than the first power generation power plus the first power, then the power generation power selected for pre-output is determined to be the first power generation power.

[0019] If the throttle opening is less than the preset throttle opening threshold, and the battery's allowable charging power is greater than the first power generation power plus the first power, then the pre-output selected power generation power is determined to be the second power generation power.

[0020] If the battery's allowed charging power is less than the second power generation power plus the second power, then power generation is not allowed, and the pre-output selected power generation power is determined to be 0 kW.

[0021] If the second power generation + the second power < the battery's allowed charging power < the first power generation + the first power, then the power generation selected for pre-output is determined to be the second power generation.

[0022] In the hybrid vehicle forced power generation control method described above, preferably, the preset throttle opening threshold is 50%, the first power is 0.8kW-1.5kW, and the second power is 0.3kW-0.7kW.

[0023] The hybrid vehicle forced power generation control method described above, preferably, involves determining the final output power generation based on the relationship between the sum of the battery's allowable charging power and the accessory's power consumption and the pre-selected power generation output, specifically including:

[0024] The smaller value between the sum of the battery's allowed charging power and the power consumed by the accessory and the pre-selected power generation power is used as the final selected power generation power for output.

[0025] This invention provides a forced power generation control method for hybrid vehicles. The method determines the pre-selected power generation power based on the relationship between the battery's allowable charging power and a first or second power generation power. The final output power is determined based on the relationship between the sum of the battery's allowable charging power and the power consumed by accessories and the pre-selected power generation power. On one hand, different levels of power generation are selected based on the accelerator pedal depth, allowing the user to choose freely according to actual conditions. On the other hand, considering the battery's charging capacity, when the battery's allowable charging power and accessory power consumption are low, reduced power generation is selected to prevent overcharging and battery damage. When the battery's allowable charging power is particularly low, forced power generation is discontinued to protect the battery. Attached Figure Description

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0027] Figure 1 A flowchart illustrating an embodiment of the forced power generation control method for hybrid vehicles provided by the present invention;

[0028] Figure 2 This is a logic diagram of an embodiment of the forced power generation control method for hybrid vehicles provided by the present invention. Detailed Implementation

[0029] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0030] The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as “including” or “contains” mean that the element preceding the term encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as “above” and “below” are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0031] In this disclosure, when a specific component is described as being located between a first component and a second component, an intermediary component may or may not be present between the specific component and the first or second component. When a specific component is described as connecting to other components, the specific component may be directly connected to the other components without having an intermediary component, or it may not be directly connected to the other components but may have an intermediary component.

[0032] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0033] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0034] Currently, the forced power generation control strategy for using the engine to quickly charge the battery forces the power generation to be set to a constant power output, with only one power output setting. In special environments, such as when the battery charging power is low at low temperatures, prolonged forced charging at high power will cause the battery charging power to decrease, leading to repeated engine shutdowns and even battery overcharging failures, resulting in a poor user experience.

[0035] like Figure 1 and Figure 2 As shown, the forced power generation control method for hybrid vehicles provided in this embodiment includes the following steps in actual implementation:

[0036] Step S1: Determine whether the conditions for triggering the forced power generation function are met.

[0037] Specifically, based on gear position, SOC, accelerator pedal depth, and holding time, it is determined whether the conditions for triggering the forced power generation function are met. In one embodiment of the forced power generation control method for hybrid vehicles of the present invention, step S1 may specifically include:

[0038] Step S11: The vehicle controller obtains the gear position, battery SOC, and accelerator pedal depth from the CAN bus.

[0039] Step S12: Determine whether the following conditions are met simultaneously: the current gear is P, the battery SOC is less than the preset SOC threshold, the accelerator pedal depth is 100% and the holding time is greater than or equal to the preset time threshold. If yes, the forced power generation function is triggered; otherwise, the forced power generation function cannot be triggered.

[0040] In some embodiments of the present invention, the preset SOC threshold is 80%, and the preset time threshold is 1 second. If the following conditions cannot be met simultaneously: the current gear is P (Park), the battery SOC is <80%, the accelerator pedal depth is 100%, and the holding time is greater than or equal to 1 second, then the forced power generation function cannot be triggered. This ensures that the function can only be triggered when the vehicle is stationary and the SOC is not full, while also ensuring that the user actively uses the function to prevent accidental triggering.

[0041] Step S2: If satisfied, then determine the pre-output power generation based at least on the relationship between the battery's allowable charging power and the first power generation power (A kW) or the second power generation power (B kW), wherein the first power generation power (A kW) is greater than the second power generation power (B kW).

[0042] Step S2 selects high or low power generation based on the throttle opening and the battery's allowable charging power. The pre-selected power output includes a first power output (A kW), a second power output (B kW), or 0 kW. In one embodiment of the hybrid vehicle forced power generation control method of the present invention, when the conditions for triggering the forced power generation function are met, step S2 may specifically include:

[0043] Step S21: If the throttle opening is greater than the preset throttle opening threshold and the battery's allowed charging power is greater than the first power generation power plus the first power, then the pre-output selected power generation power is determined to be the first power generation power.

[0044] The preset throttle opening threshold is 50%, and the first power is 0.8kW-1.5kW, for example, 1kW. Furthermore, the vehicle controller obtains the battery's allowed charging power from the CAN bus.

[0045] Step S22: If the throttle opening is less than the preset throttle opening threshold and the battery's allowed charging power is greater than the first power generation power plus the first power, then the pre-output selected power generation power is determined to be the second power generation power.

[0046] Step S23: If the battery's allowed charging power is less than the second power generation power + the second power, then power generation is not allowed, and the pre-output selected power generation power is determined to be 0 kW.

[0047] The second power is 0.3kW-0.7kW, for example, 0.5kW.

[0048] Step S24: If the second power generation + the second power < the battery's allowed charging power < the first power generation + the first power, then determine the pre-output selected power generation as the second power generation.

[0049] Step S3: Determine the final output power based on the relationship between the sum of the battery's allowed charging power and the accessory's power consumption and the power generation selected for pre-output.

[0050] The vehicle controller obtains the battery's allowable charging power and the accessory's power consumption from the CAN bus. Specifically, it outputs the smaller value between the sum of the battery's allowable charging power and the accessory's power consumption and the pre-selected power generation power as the final selected power generation power.

[0051] As mentioned earlier, considering the impact of different power generation on vehicle noise, when the sum of the battery's allowable charging power and the power consumed by accessories exceeds the pre-selected power generation, the pre-selected power generation becomes the final selected power generation. This forced power generation strategy is designed as constant power generation, with two levels: high-power generation (AkW) and low-power generation (BkW). When the sum of the battery's allowable charging power and the power consumed by accessories is less than the pre-selected power generation, the final output power is the sum of the battery's allowable charging power and the power consumed by accessories. This forced power generation strategy is designed as variable power generation, where the power generation can be adjusted according to the battery's allowable charging power and the power consumed by accessories. Through these two control methods—constant power generation and variable power generation—it is possible to ensure rapid power generation when the vehicle needs power, and slow charging when the battery's allowable charging capacity weakens, protecting the battery and preventing damage such as overcharging.

[0052] It should be noted that the hybrid vehicle forced power generation control method of the present invention is used in the field of hybrid electric vehicle power system control and is suitable for different types of hybrid control systems, such as the currently mainstream range-extended hybrid or PHEV plug-in hybrid. The present invention does not make any specific limitation on this.

[0053] The hybrid vehicle forced power generation control method provided in this invention determines the pre-selected power generation power based on the relationship between the battery's allowable charging power and a first or second power generation power; and determines the final output power based on the relationship between the sum of the battery's allowable charging power and the accessory's power consumption and the pre-selected power generation power. On one hand, different levels of power generation are selected based on the accelerator pedal depth, allowing the user to choose freely according to actual conditions. On the other hand, considering the battery's charging power capability, when the battery's allowable charging power and the accessory's power consumption are low, power generation is reduced to prevent overcharging and battery damage; when the battery's allowable charging power is particularly low, forced power generation is discontinued to protect the battery.

[0054] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0055] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A forced power generation control method for hybrid vehicle models, characterized in that, include: Determine whether the conditions for triggering the forced power generation function are met; If satisfied, the pre-output power is determined based at least on the relationship between the battery's allowable charging power and the first or second power generation, wherein the first power generation is greater than the second power generation. Based on the relationship between the sum of the battery's allowed charging power and the power consumed by the accessories and the pre-selected power output, the final output power is determined: the smaller value between the sum of the battery's allowed charging power and the power consumed by the accessories and the pre-selected power output is used as the final selected output power. The pre-selected power output includes a first power output, a second power output, or 0 kW. When the conditions for triggering the forced power generation function are met, the step of determining the pre-output selected power generation power based at least on the relationship between the battery's allowable charging power and the first power generation power or the second power generation power, wherein the first power generation power is greater than the second power generation power, specifically includes: If the throttle opening is greater than the preset throttle opening threshold, and the battery's allowable charging power is greater than the first power generation power plus the first power, then the power generation power selected for pre-output is determined to be the first power generation power. If the throttle opening is less than the preset throttle opening threshold, and the battery's allowable charging power is greater than the first power generation power plus the first power, then the pre-output selected power generation power is determined to be the second power generation power. If the battery's allowed charging power is less than the second power generation power plus the second power, then power generation is not allowed, and the pre-output selected power generation power is determined to be 0 kW. If the second power generation + the second power < the battery's allowed charging power < the first power generation + the first power, then the power generation selected for pre-output is determined to be the second power generation.

2. The forced power generation control method for hybrid vehicles according to claim 1, characterized in that, The determination of whether the conditions for triggering the forced power generation function are met specifically includes: The system determines whether the conditions for triggering the forced power generation function are met based on the gear position, state of charge (SOC), accelerator pedal depth, and holding time.

3. The forced power generation control method for hybrid vehicles according to claim 2, characterized in that, The determination of whether the conditions for triggering the forced power generation function are met based on gear position, battery SOC, accelerator pedal depth, and holding time specifically includes: The vehicle controller obtains gear position, battery SOC, and accelerator pedal depth from the CAN bus. Determine if the following conditions are met simultaneously: the current gear is P, the battery SOC is less than the preset SOC threshold, the accelerator pedal depth is 100% and the holding time is greater than or equal to the preset time threshold. If so, the forced power generation function is triggered; otherwise, the forced power generation function cannot be triggered.

4. The forced power generation control method for hybrid vehicles according to claim 3, characterized in that, The preset SOC threshold is 80%, and the preset time threshold is 1 second.

5. The forced power generation control method for hybrid vehicles according to claim 1, characterized in that, The preset throttle opening threshold is 50%, the first power is 0.8kw-1.5kw, and the second power is 0.3kw-0.7kw.

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