Climbing control method of hybrid electric vehicle, medium and vehicle

Abstract

The invention provides a climbing control method of a hybrid electric vehicle, a medium and the vehicle, and relates to the technical field of hybrid electric vehicles. The method comprises the steps that first working condition information of the vehicle is obtained under the condition that the vehicle is in a pure electric climbing state, then second working condition information of the vehicle is obtained under the condition that it is determined that the first working condition information meets the engine forbidden enabling condition, and finally starting of an engine is forbidden under the condition that the second working condition information meets the engine forbidden enabling condition. Therefore, according to the various vehicle condition information, starting of the engine is reasonably controlled, the phenomenon that the climbing performance of the hybrid vehicle is reduced and even the phenomenon of slope sliding caused by unreasonable starting of the engine in the climbing process of the hybrid vehicle is avoided, the climbing ability of the hybrid vehicle in various climbing scenes is guaranteed, and then the user experience is improved.

Description

Technical Field

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

[0002] A hybrid vehicle is a vehicle whose driving system is composed of two or more single driving systems that can operate simultaneously. The driving power of the vehicle is provided by the single driving system alone or together according to the actual driving state of the vehicle. Hybrid vehicles achieve more efficient energy utilization and lower fuel consumption by combining the advantages of engines and electric motors.

[0003] When hybrid vehicles use the pure electric four-wheel drive power mode to climb a slope, if the slope is large, the engine will usually start to provide assistance. However, since the vehicle speed is often relatively low when climbing a slope, the engine often cannot enter direct drive after starting. This not only fails to improve the vehicle's climbing ability, but also reduces the vehicle's climbing ability. Even after starting the engine during the climbing process, the vehicle may slip. Therefore, how to reasonably control the engine of a hybrid vehicle during the climbing process has become an urgent problem to be solved. Summary of the invention

[0004] The present application provides a hybrid vehicle climbing control method, medium and vehicle, which can reasonably control the start of the engine in combination with vehicle conditions and environmental factors to ensure the vehicle's climbing ability.

[0005] A first aspect of an embodiment of the present application provides a hill climbing control method for a hybrid vehicle, the method comprising: When the vehicle is in a pure electric climbing state, obtaining first operating condition information of the vehicle; When it is determined that the first operating condition information satisfies the engine disabling enabling condition, obtaining second operating condition information of the vehicle; When the second operating condition information satisfies the engine disabling condition, starting the engine is prohibited.

[0006] Optionally, the first operating condition information includes the current vehicle speed or the torque output capacity of the vehicle; the torque output capacity of the vehicle includes the first driving capacity of the engine and the second driving capacity of the front drive motor; When the current vehicle speed is less than a vehicle speed threshold, or the first driving capability is less than the second driving capability, it is determined that the first operating condition information satisfies the engine disabling enabling condition.

[0007] Optionally, the second operating condition information includes an actual slope value, a current remaining power of the power battery, and a current maximum discharge power; the method further includes: When the current remaining power is greater than the power threshold, the current maximum discharge power is greater than the power threshold, and the actual slope value is greater than the slope threshold, it is determined that the second operating condition information satisfies the engine disabling condition.

[0008] Optionally, the method further comprises: Acquire a temperature power meter, where the temperature power meter is used to characterize a corresponding relationship between a battery temperature and a battery power threshold; A battery charge threshold of the battery is determined based on the battery temperature and the temperature charge gauge.

[0009] Optionally, the method further comprises: Acquire a climbing power meter, where the climbing power meter is used to characterize the corresponding relationship between the vehicle speed, the actual slope value, and the power threshold of the battery; A power threshold of the battery is determined based on the vehicle speed, the actual slope value and the hill climbing power table.

[0010] Optionally, the method further comprises: Obtaining a first limit slope value corresponding to a pure electric rear-wheel drive mode and a second limit slope value corresponding to a pure electric four-wheel drive mode; The gradient threshold is determined based on the first limiting gradient value and the second limiting gradient value.

[0011] Optionally, when the second operating condition information satisfies a preset engine disabling condition, prohibiting starting the engine includes: When the second operating condition information satisfies a preset engine disabling condition, activating an engine start prohibition flag; When the activation time of the engine start prohibition flag exceeds a time threshold, starting the engine is prohibited.

[0012] Optionally, the method further comprises: When the current remaining power is less than or equal to the power threshold, or the current maximum discharge power is less than or equal to the power threshold, or the actual slope value is less than or equal to the slope threshold, or the vehicle has a driving fault, it is determined that the second operating condition information does not meet the engine disabling condition.

[0013] Based on the same inventive concept, a second aspect of an embodiment of the present application provides a hill climbing control device for a hybrid vehicle, the device comprising: A first judgment module, used for obtaining first operating condition information of the vehicle when the vehicle is in a pure electric climbing state; A second judgment module is used to obtain second operating condition information of the vehicle when it is determined that the first operating condition information meets the engine disabling enabling condition; The start prohibition module is used to prohibit starting the engine when the second operating condition information meets the engine prohibition condition.

[0014] Based on the same inventive concept, the third aspect of an embodiment of the present application provides a storage medium, in which machine executable instructions are stored. When the machine executable instructions are executed by a processor, the hybrid vehicle climbing control method proposed in the first aspect of the present application is implemented.

[0015] Based on the same inventive concept, the fourth aspect of an embodiment of the present application provides a vehicle, including a processor and a memory; the memory stores machine executable instructions that can be executed by the processor, and the processor is used to execute the machine executable instructions to implement the hill climbing control method for a hybrid vehicle proposed in the first aspect of the present application.

[0016] Compared with the prior art, this application has the following advantages: The embodiment of the present application provides a method for controlling the climbing of a hybrid vehicle. First, when the vehicle is in a pure electric climbing state, the first operating condition information of the vehicle is obtained. Then, when it is determined that the first operating condition information meets the engine disabling enabling condition, the second operating condition information of the vehicle is obtained. Finally, when the second operating condition information meets the engine disabling condition, the engine is prohibited from starting. Thus, by reasonably controlling the start of the engine according to a variety of vehicle condition information, it is avoided that the hybrid vehicle's climbing performance is reduced or even the phenomenon of sliding down the slope is avoided due to unreasonable engine start during the climbing process, thereby ensuring the climbing ability of the hybrid vehicle in various climbing scenarios, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0018] Figure 1 is a flow chart of a hill climbing control method for a hybrid vehicle in one embodiment of the present application; Figure 2 is a flow chart of a hill climbing control method for a hybrid vehicle proposed in another embodiment of the present application; Figure 3 It is a functional module schematic diagram of a hill climbing control device for a hybrid vehicle in one embodiment of the present application; Figure 4It is a structural schematic diagram of a vehicle in one embodiment of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] When hybrid vehicles use the pure electric four-wheel drive power mode to climb a slope, if they encounter a large slope, they usually start the engine to provide assistance. In this process, if the torque provided by the engine is greater than the torque provided by the front motor, and the engine can be driven directly after starting the engine, the vehicle's climbing ability can be smoothly improved. However, since the vehicle speed is often relatively low when climbing a slope, the engine often cannot enter direct drive after starting, but generates electricity, such as switching from pure electric four-wheel drive mode to series mode or power split mode. In series mode, the engine drives the generator to charge the power battery, and the generated electricity is provided to the rear drive motor to drive the vehicle; in power split mode, part of the engine's output power will be used to drive the generator to charge the power battery, and the other part of the output power will be used to directly drive the vehicle. Since the engine's output power cannot be fully used to drive the vehicle, its driving ability may be relatively small compared to the driving ability of the front drive motor. This will not only fail to improve the vehicle's climbing ability, but will also reduce the vehicle's climbing ability, and even after starting the engine during the climbing process, the vehicle may slip.

[0021] In view of this, the present application provides a hill climbing control method for a hybrid vehicle. When the hybrid vehicle climbs a hill using a pure electric drive power mode, the engine start is reasonably controlled according to a variety of vehicle condition information to avoid the hybrid vehicle's climbing performance being reduced or even rolling down the hill due to unreasonable engine start during the climbing process, thereby ensuring the hybrid vehicle's climbing ability in various climbing scenarios and improving the user experience.

[0022] Please refer to Figure 1 , Figure 1 1 is a flow chart of a method for controlling a hill climb of a hybrid vehicle according to an embodiment of the present application. Figure 1 As shown, the method comprises the following steps: S101: When the vehicle is in a pure electric climbing state, obtaining first operating condition information of the vehicle.

[0023] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, or an electronic device with the above functions such as a driving computer, an on-board computer, etc., such as ECU (Electronic Control Unit), BCM (Body Control Module), VCU (Vehicle Control Unit), etc. This implementation will be described with VCU as the execution subject. It should be noted that this implementation does not make specific restrictions on the execution subject.

[0024] In this embodiment, the vehicle being in a pure electric climbing state means that the vehicle is in a pure electric drive power mode and is in a climbing state at the same time. The pure electric drive power mode includes a pure electric rear-wheel drive and a pure electric four-wheel drive drive mode.

[0025] In specific implementations, the control system of the automatic transmission is usually equipped with tilt sensors, which can capture tiny changes in slope. By detecting the front and rear tilt angles of the vehicle and other information, the sensors feed back to the VCU, allowing the VCU to determine whether the vehicle is climbing a slope based on these key information. For example, when it is detected that the current slope of the vehicle's position is greater than a preset slope threshold, it can be determined that the vehicle is in a climbing state.

[0026] In addition, considering that when the vehicle is climbing a slope, the driver usually steps on the accelerator to get more power. Therefore, the VCU can also capture this change by monitoring the accelerator position and the response speed of the accelerator pedal, so as to determine whether the driver is trying to cope with the climbing situation. When it is detected that the driver has the intention to climb a slope, it is determined that the vehicle is in a climbing state.

[0027] It is easy to understand that when the vehicle is in pure electric climbing state, the gear lever position of the vehicle is in D gear (forward gear) or R gear (reverse gear), that is, the vehicle is in a non-parking state.

[0028] In this embodiment, when the VCU of the hybrid vehicle detects that the vehicle is in a pure electric climbing state, the first operating condition information of the vehicle is obtained to determine whether the vehicle can use the engine to drive the vehicle to climb the hill.

[0029] S102: When it is determined that the first operating condition information satisfies the engine disabling enabling condition, obtaining second operating condition information of the vehicle.

[0030] It should be noted that the engine disabling enabling condition is used to determine whether there is a risk of reducing the driving force of the entire vehicle after the engine is started.

[0031] Specifically, if the VCU detects that the first operating condition information does not meet the engine disabling enable conditions, it means that there is no risk of reducing the driving force of the whole vehicle after the engine is started. At this time, there is no need to disable the engine, and the engine can be started directly to drive the vehicle to improve the vehicle's climbing ability; if the VCU detects that the first operating condition information meets the engine disabling enable conditions, it means that there is a risk of reducing the driving force of the whole vehicle when starting the engine at this time. At this time, it is necessary to further combine the second operating condition information to accurately determine whether the engine needs to be disabled.

[0032] Specifically, this embodiment further obtains the second operating condition information of the vehicle to make a comprehensive judgment on whether to prohibit starting the engine according to the second operating condition information. The second operating condition information is different from the first operating condition information. The second operating condition information is mainly used to reflect the current pure electric climbing ability of the vehicle and the climbing difficulty faced. For example, the second operating condition information may include the current remaining power of the power battery and / or the current maximum discharge power and / or the actual slope value.

[0033] S103: When the second operating condition information satisfies the engine disabling condition, starting the engine is prohibited.

[0034] In this embodiment, by obtaining the second operating condition information, the current pure electric climbing ability of the vehicle and the climbing difficulty faced can be understood, and by comparing the second operating condition information with the engine disabling condition, it is finally decided whether to prohibit starting the engine. Among them, the engine disabling condition is different from the engine disabling enabling condition. The engine disabling condition is used to characterize the real-time operating condition requirements required to prohibit starting the engine, including the current remaining power of the battery and / or the current maximum discharge power and / or the actual slope value, etc.

[0035] Specifically, if the VCU detects that the second operating condition information meets the engine disabling condition, it means that the current operating condition of the vehicle meets the real-time operating condition requirements required to prohibit starting the engine. Then the VCU issues a control instruction to prohibit starting the engine to avoid unreasonable starting of the engine and reduce the vehicle's climbing ability.

[0036] On the other hand, if the VCU detects that the second operating condition information does not meet the engine disabling condition, it means that the current operating condition of the vehicle does not meet the real-time operating condition requirement for disabling the engine start, that is, the engine can be properly started at this time, and there is no need to prohibit the start. In this case, the VCU will not issue a control instruction to prohibit the engine start.

[0037] This application designs an engine disabling strategy for the situation where starting the engine may affect the climbing performance of the vehicle when the hybrid vehicle climbs a hill in pure electric drive mode. By detecting a variety of vehicle condition information, it is determined whether the engine should be prohibited from starting, so as to reasonably control the engine starting, avoid the hybrid vehicle's climbing performance being reduced or even rolling down the hill due to unreasonable engine starting during the climbing process, ensure the hybrid vehicle's climbing ability in various climbing scenarios, and thus improve the user experience.

[0038] Please refer to Figure 2 , Figure 2 FIG. 1 is a flow chart of a method for controlling a hill climb of a hybrid vehicle according to another embodiment of the present application. Figure 2 As shown, the process mainly includes: S201: When the vehicle is in a pure electric climbing state, when the current vehicle speed is less than a vehicle speed threshold, or when the first driving capability is less than the second driving capability, determining that the first operating condition information satisfies an engine disabling enabling condition.

[0039] It should be noted that when a hybrid vehicle is climbing a hill in pure electric drive mode, if the engine can enter the direct drive mode after starting the engine, and the torque provided by the engine is greater than the torque provided by the front motor, the vehicle's climbing ability can be smoothly improved. However, for the engine to enter the direct drive mode, a certain matching relationship between the vehicle speed and the engine speed is usually required. When climbing a hill at low speed, the engine speed may not match the wheel speed, so the engine may not enter the direct drive mode, and the engine cannot directly drive the vehicle at this time. Moreover, for a series hybrid vehicle in which the engine and the front drive motor are connected in series, the torque output of the engine at low speed may be relatively small compared to the torque output of the front motor, and it cannot quickly respond to the power demand required when climbing a hill. At this time, starting the engine may cause the vehicle's climbing ability to decrease. At the same time, the engine speed range is limited. If it is directly connected to the drive system at low speed, it may cause the power output to be uneven or unable to meet the climbing requirements. When the engine is started when climbing a hill at low speed, the engine may not provide enough torque to overcome gravity, but instead cause the vehicle's climbing performance to decrease.

[0040] In this embodiment, in order to accurately determine whether there is a risk of reducing the driving force of the entire vehicle after the engine is started, the first operating condition information may include the current vehicle speed or the torque output capacity of the vehicle. The torque output capacity of the vehicle includes the first driving capacity of the engine and the second driving capacity of the front drive motor.

[0041] Specifically, when the VCU detects that the current vehicle speed is less than the vehicle speed threshold, or when the first driving capacity of the engine is less than the second driving capacity of the front drive motor, it is considered that the first operating condition information meets the engine disabling enabling condition. In other words, the current operating condition of the vehicle is not suitable for starting the engine, because even if the engine is turned on at this time, the vehicle's climbing ability cannot be smoothly improved, and may even slip, so the engine should be disabled.

[0042] On the other hand, if the current vehicle speed is greater than or equal to the vehicle speed threshold, and the first driving capability of the engine is greater than or equal to the second driving capability of the front drive motor, it is considered that the first operating condition information does not meet the engine disabling enabling condition. In other words, the current operating condition of the vehicle can support timely starting of the engine to achieve the purpose of improving the vehicle's climbing performance, so there is no need to disable the engine.

[0043] Furthermore, the setting of the speed threshold depends on the vehicle model, and the speed thresholds of different vehicle models may be different. For example, the speed thresholds of some vehicle models are 40 kilometers per hour, and some are 60 kilometers per hour.

[0044] Secondly, based on the vehicle speed threshold, slope and the maximum driving power that the vehicle can provide in pure electric state, the vehicle speed map table (a table used to find data mapping relationships) formed by the three can be used to determine a vehicle speed threshold that meets the current actual situation by looking up the table according to the current slope and maximum driving power. Among them, the greater the slope and the maximum driving power, the greater the corresponding vehicle speed threshold.

[0045] It should be noted that the speed threshold in the speed map should be lower than the engine direct drive enable value (the minimum speed at which the vehicle starts the engine and can enter engine direct drive). Therefore, during the climbing process, if the current vehicle speed is less than the speed threshold, it means that the current vehicle speed is less than the minimum speed required for the vehicle to start the engine and enter engine direct drive. In other words, if the engine is started at this time, the engine cannot enter direct drive, and may even cause the vehicle's climbing performance to decrease. Therefore, the engine needs to be disabled at this time.

[0046] The driving capacity of the engine and the front-drive motor also depends on the vehicle type. In a specific implementation, the first basic driving capacity of the engine and the second basic driving capacity of the front-drive motor can be determined based on the vehicle type. Then, based on the first correction factor of the engine, the first basic driving capacity is corrected to obtain the first driving capacity of the engine. Based on the second correction factor of the front-drive motor, the second basic driving capacity is corrected to obtain the second driving capacity of the front-drive motor.

[0047] In this embodiment, the first correction factor represents the factors that affect the driving performance of the engine, which may specifically include atmospheric pressure and engine coolant temperature. Specifically, if the air pressure is insufficient, the air is thin, and the oxygen supply is insufficient, it will lead to incomplete combustion, affecting the output power and horsepower of the engine. At the same time, insufficient air pressure means that the engine needs to run at a higher speed to obtain sufficient power output, which will bring a greater load to the engine. In addition, excessively high engine coolant temperature may cause a reduction in the internal mixture of the engine or a change in performance, thereby affecting combustion efficiency and power output. In extreme cases, it may also cause permanent damage to the engine. When the coolant temperature is too high, it may cause the engine to intensify knock and even tend to pre-ignite.

[0048] Therefore, in this embodiment, the first driving capacity of the engine can be determined in combination with dynamic parameters such as atmospheric pressure and engine coolant temperature. Compared with the method of determining it based on fixed parameters such as vehicle model, it can achieve more accurate judgment of the first driving capacity of the engine.

[0049] In this embodiment, the second correction factor represents the factors that affect the driving performance of the front-drive motor, which may specifically include battery operating condition information and / or motor environment information, wherein the battery operating condition information may include battery voltage, battery temperature and operating frequency. Specifically, the stability of the battery operating condition information has an important impact on the performance of the motor. Unstable power supply voltage and operating frequency may cause motor performance fluctuations and affect its driving ability. At the same time, the temperature and humidity in the motor environment information, the size and type of load, and the change characteristics will also affect the driving ability of the motor. Therefore, in this embodiment, the accurate judgment of the second driving ability of the front-drive motor can be achieved by combining dynamic parameters such as battery operating condition information and / or motor environment information.

[0050] In this embodiment, when the VCU detects that the vehicle is in a pure electric climbing state, by acquiring the first operating condition information of the vehicle, it can understand the current vehicle speed and / or torque output capacity of the vehicle, and by comparing the first operating condition information with the engine disabling enabling condition, it can achieve a comprehensive and accurate judgment of the engine disabling enabling condition from the two dimensions of vehicle speed and torque output capacity.

[0051] If the first operating condition information meets the engine disabling enabling condition, it means that the current vehicle speed and / or torque output capacity may not meet the basic operating condition requirements for starting the engine to improve the climbing ability, that is, the vehicle may not be able to support the engine to enter the direct drive mode after starting and provide a large torque output. Therefore, when the first operating condition information meets the engine disabling enabling condition, if the engine is started, there is a risk of reducing the driving force of the whole vehicle, so the second operating condition information is further obtained, and combined with the second operating condition information, it is accurately determined whether the engine needs to be disabled.

[0052] S202: Obtain second operating condition information of the vehicle, and determine that the second operating condition information satisfies the engine disabling condition when the current remaining power is greater than the power threshold, the current maximum discharge power is greater than the power threshold, and the actual slope value is greater than the slope threshold.

[0053] The second operating condition information includes the actual slope value, the current remaining power of the power battery, and the current maximum discharge power. The power threshold, power threshold, and slope threshold can be calibrated through actual climbing tests. Please refer to the following for details. The engine disable condition is used to determine whether the engine should be disabled.

[0054] In this embodiment, when the first operating condition information satisfies the engine disabling enabling condition, the second operating condition information of the vehicle is further obtained to combine the current remaining power of the battery, the current maximum discharge power and the actual slope value to finally decide whether to disable the engine, thereby improving the accuracy of the decision. Among them, the current remaining power of the battery and the current maximum discharge power reflect the climbing ability of the vehicle in the pure electric drive mode, while the actual slope value reflects the climbing difficulty currently faced by the vehicle.

[0055] Specifically, by comparing the current remaining power of the battery, the current maximum discharge power and the actual slope value with the engine disabling condition, if the VCU detects that the current remaining power is greater than the power threshold and the current maximum discharge power is greater than the power threshold, it means that the battery is sufficient and the motor can provide greater power to the vehicle. Starting the engine at this time may break the original power balance, so there is no need to start the engine. If the actual slope value is greater than the slope threshold, it means that the maximum power that the pure electric drive mode can provide to the vehicle is not enough to meet the current climbing needs of the vehicle. Starting the engine at this time may cause the power system to bear too much load. This overload may cause damage to the engine, motor and transmission system, shortening their service life. In addition, starting the engine at this time may cause a sudden increase in the power output of the vehicle, resulting in dangerous situations such as loss of control of the vehicle or skidding. Therefore, in order to ensure driving safety, starting the engine should be prohibited.

[0056] Therefore, when the current remaining power of the battery is greater than the power threshold, the current maximum discharge power is greater than the power threshold, and the actual slope value is greater than the slope threshold, it means that although the pure electric drive mode of the vehicle can provide greater power for the vehicle, the power provided by the pure electric drive mode is still insufficient to overcome the slope due to the great difficulty of climbing the slope currently faced by the vehicle. Therefore, it is determined that the second operating condition information meets the engine disabling condition, so as to prohibit starting the engine under this operating condition to ensure driving safety.

[0057] Furthermore, when the current remaining power is less than or equal to the power threshold, or the current maximum discharge power is less than or equal to the power threshold, or the actual slope value is less than or equal to the slope threshold, or the vehicle has a driving fault, it is determined that the second operating condition information does not meet the engine disabling condition.

[0058] In this embodiment, if the VCU detects that the current remaining power of the battery is less than or equal to the power threshold, or the current maximum discharge power is less than or equal to the power threshold, it means that the motor cannot provide sufficient power for the vehicle. At this time, if other conditions permit, the engine should be started to charge the motor to improve the vehicle's climbing ability. If the actual slope value is less than or equal to the slope threshold, it means that the vehicle as a whole has the ability to overcome the slope, so the engine should be started in a timely manner according to the normal engine start strategy to ensure that the vehicle can exert its maximum climbing ability. Therefore, when the current remaining power is less than or equal to the power threshold, or the current maximum discharge power is less than or equal to the power threshold, or the actual slope value is less than or equal to the slope threshold, the engine should not be prohibited from starting, so it is determined that the second operating condition information does not meet the engine disabling condition, and the engine start is not restricted.

[0059] In addition, in the case of a driving fault in the vehicle, such as a battery failure that causes power to be unable to be output, a rear axle failure that causes the rear drive motor to be unable to drive, etc., it is also determined that the second operating condition information does not meet the engine disabling condition, that is, the engine can be started normally. This is because the driving fault may involve multiple systems, such as the fuel system, intake system, transmission system, or internal engine sensors, etc. Therefore, in some cases, the driving fault may only be an abnormal operation of a certain sensor or actuator, and will not affect the basic operation of the engine. Therefore, at this time, you can try to start the engine to further determine the specific location and severity of the fault, and keep the vehicle at least a certain driving ability, so that the vehicle can be driven to a repair shop for further inspection and repair.

[0060] In this embodiment, when the first operating condition information satisfies the engine disabling enabling condition and the second operating condition information satisfies the engine disabling condition, it is determined that the engine should be disabled to avoid turning on the engine and reducing the vehicle's climbing ability while ensuring driving safety.

[0061] That is, when the current vehicle speed is less than the vehicle speed threshold, the current remaining power is greater than the power threshold, the current maximum discharge power is greater than the power threshold, and the actual slope value is greater than the slope threshold, the engine is prohibited from starting to avoid the inability to enter the direct drive mode after the engine is started, which leads to a decrease in the vehicle's climbing performance. It should be noted that there is no limit on the vehicle's torque output capacity at this time, and the first driving capacity of the engine can be greater than the second driving capacity of the front drive motor, or it can be less than the second driving capacity of the front drive motor.

[0062] In addition, when the first driving capacity of the engine is less than the second driving capacity of the front drive motor, the current remaining power is greater than the power threshold, the current maximum discharge power is greater than the power threshold, and the actual slope value is greater than the slope threshold, the engine is also prohibited from starting to ensure driving safety. It should be noted that there is no limit on the current speed of the vehicle at this time, and the current speed can be less than the speed threshold or greater than the speed threshold.

[0063] S203: Activate the engine start prohibition flag, and prohibit starting the engine when the activation time of the engine start prohibition flag exceeds a time threshold.

[0064] In this embodiment, when the first operating condition information satisfies the engine disable enabling condition and the second operating condition information satisfies the engine disable condition, the engine start prohibition flag is activated and timing is started to record the activation duration of the engine start prohibition flag, providing a data basis for subsequent engine start prohibition control. Once the engine start prohibition flag is activated, the engine is in a locked state, and it is necessary to ultimately decide whether to issue a control instruction to prohibit starting the engine based on the activation duration of the engine start prohibition flag, and then control the engine accordingly.

[0065] Specifically, if the VCU detects that the activation time of the engine start prohibition flag exceeds the time threshold, it means that the current vehicle operating condition is stable in a state where the engine should be disabled, so a control instruction to prohibit starting the engine is issued to avoid starting the engine and affecting the vehicle's climbing performance. Conversely, if the activation time does not exceed the time threshold, the engine is not prohibited.

[0066] The duration threshold can be set according to the stability of the vehicle's operating conditions during the climbing process, for example, 1000ms. Thus, by setting the duration threshold, the VCU is ensured to have enough time to confirm whether the engine should really be prohibited from starting, avoiding misjudgment caused by occasional operating conditions, and improving the stability and reliability of vehicle control.

[0067] This embodiment designs an engine disabling strategy for hybrid vehicles that cannot enter the direct drive mode when the engine is started at a low speed, or the driving capacity of the engine is less than the driving capacity of the front drive motor. It determines whether to activate the engine start prohibition flag according to the current operating condition of the vehicle, and determines whether to issue a control instruction to prohibit starting the engine according to the activation duration of the engine start prohibition flag. Based on the current operating condition of the vehicle and the stability of the operating condition, the engine disabling control is accurately judged, thereby promoting reasonable control of the engine start, avoiding the hybrid vehicle's climbing performance being reduced or even rolling down the slope due to unreasonable engine starting during the climbing process, ensuring the hybrid vehicle's climbing ability in various climbing scenarios, and thus improving the user experience.

[0068] In a feasible implementation manner, in order to determine a suitable power threshold, the hill climbing control method of a hybrid vehicle may further include the following steps: S301: Acquire a temperature and power meter, where the temperature and power meter is used to represent a corresponding relationship between a battery temperature and a battery power threshold.

[0069] S302: Determine a battery power threshold based on the battery temperature and the temperature power meter.

[0070] In this embodiment, the battery power threshold refers to a condition triggered when the battery reaches a certain power level during charging or discharging. For example, it can be set to start charging when the remaining battery power is less than 30%, and stop charging when the battery is charged to 80%, so as to ensure that the power battery has enough power to support the energy required for the vehicle to climb the slope.

[0071] There is a mutual influence between the battery power threshold and battery temperature. Temperature affects the performance and health of the battery, while the setting of the power threshold affects the battery's usage frequency and charge and discharge depth, which in turn affects the battery temperature. For example, in a high temperature environment, the internal chemical reaction of the battery is accelerated, which may cause the battery power to be consumed faster, while a low temperature may cause the electrolyte inside the battery to solidify, affecting the normal charge and discharge of the battery, which is also detrimental to the health of the battery. Therefore, it is necessary to appropriately adjust the power threshold to meet the needs of different environments.

[0072] Exemplarily, the corresponding relationship between the battery temperature and the battery power threshold is shown in Table 1 below: Table 1 Temperature and electricity meter

[0073] When applied, based on the battery temperature and the temperature meter, a suitable power threshold can be determined by looking up the table. For example, when the current battery temperature is 15°C, by looking up the temperature meter, it can be known that the corresponding power threshold is 30%. On this basis, if the current remaining power of the battery is greater than 30%, it means that the power battery has enough power to support the vehicle climbing, so there is no need to start the engine.

[0074] This embodiment constructs a temperature power meter to quantify the correspondence between the battery temperature and the battery power threshold, and obtains the battery power threshold at different temperatures. When applied, the appropriate power threshold can be directly obtained by looking up the table according to the current battery temperature, which is not only convenient and fast, but also can more effectively manage the battery charging and discharging process, avoiding damage to battery performance caused by overcharging or over-discharging of the battery. In addition, the determined power threshold will be used in the subsequent judgment process of prohibiting the start of the engine, thereby controlling the start of the engine more reasonably and effectively.

[0075] Optionally, in a feasible implementation manner, in order to determine a suitable power threshold, the hill climbing control method for a hybrid vehicle may further include the following steps: S401: Acquire a hill climbing power meter, where the hill climbing power meter is used to represent the corresponding relationship between the vehicle speed, the actual slope value, and the battery power threshold.

[0076] S402: Determine a battery power threshold based on the vehicle speed, the actual slope value and the climbing power table.

[0077] In this embodiment, the power threshold of the battery refers to the maximum discharge power of the battery. The vehicle speed and slope are both important factors affecting the maximum discharge power of the battery. Specifically, the higher the speed, the higher the discharge rate or power density that the battery needs to provide. This is because when driving at high speed, the vehicle needs more energy to maintain its motion state. Under the condition of a constant slope, as the speed increases, the power required by the vehicle also increases, which means that the maximum discharge power that the battery needs to provide must also be increased accordingly. For example, when the maximum speed of some micro electric vehicles is 40km / h, the required rated power is 2kW; when the maximum speed is 60km / h, the required rated power increases to 5kW. Secondly, slope resistance is one of the main reasons for the significant increase in power consumption of the vehicle when climbing a slope. At the same speed, as the slope increases, the component of gravity that the vehicle needs to overcome along the slope direction increases, so the maximum discharge power that the battery needs to provide also increases accordingly. Therefore, it is necessary to appropriately adjust the power threshold of the battery to adapt to the needs of different vehicle speeds and slopes to ensure that the power battery can provide sufficient power to support the vehicle at a certain speed and slope.

[0078] For example, taking a vehicle with a front-drive configuration of: 1.5L turbocharged gasoline engine (i.e., engine, with a maximum power of 100kW) + a front-drive motor with a maximum power of 130Kw as an example, the climbing power table constructed for it is shown in Table 2 below: Table 2 Climbing power table

[0079] Among them, X represents the slope in %, and Y represents the vehicle speed in kph. When applied, according to the vehicle speed and the actual slope value, a suitable power threshold can be determined by looking up the table. For example, when the current vehicle speed is 15kph and the actual slope value is 30%, by looking up the climbing power table, it can be known that the corresponding power threshold is 90%. On this basis, if the current maximum discharge power of the battery is greater than 90%, it means that the power battery has enough power to support the vehicle climbing, so there is no need to start the engine.

[0080] This embodiment constructs a climbing power table to quantify the correspondence between the vehicle speed, the actual slope value and the battery power threshold, and obtains the battery power threshold at different vehicle speeds and slopes. On the one hand, it can accurately understand the maximum discharge power of the battery at different vehicle speeds and slopes, thereby optimizing the vehicle's climbing ability and helping to ensure that the vehicle maintains good power performance in complex terrain. On the other hand, it can improve energy utilization efficiency and make the battery more efficient during the discharge process by adjusting the vehicle's power system. This can not only extend the battery life, but also improve the vehicle's endurance.

[0081] When applied, the appropriate power threshold can be directly looked up in the table according to the current vehicle speed and actual slope value. This is not only convenient and quick, but the determined power threshold will be used in the subsequent judgment process of the conditions for prohibiting the start of the engine, thereby achieving more reasonable and effective control over the start of the engine.

[0082] Optionally, in a feasible implementation manner, in order to determine a suitable slope threshold, the hill climbing control method for a hybrid vehicle may further include the following steps: S501: Obtain a first limit slope value corresponding to the pure electric rear-wheel drive mode and a second limit slope value corresponding to the pure electric four-wheel drive mode.

[0083] S502: Determine a slope threshold based on the first limit slope value and the second limit slope value.

[0084] In this embodiment, the first limit slope value refers to the maximum slope that the vehicle can stably climb in the pure electric rear-wheel drive mode. The second limit slope value refers to the maximum slope that the vehicle can stably climb in the pure electric four-wheel drive mode.

[0085] In the specific implementation, the first limit slope value corresponding to the pure electric rear-wheel drive mode and the second limit slope value corresponding to the pure electric four-wheel drive mode can be obtained through simulation. For example, using automobile simulation software such as Cruise (AVL Cruise, a whole vehicle and powertrain simulation analysis software), Matlab (matrix&laboratory, matrix laboratory) or Simulink (a visual simulation tool in Matlab), according to the actual parameters of the vehicle, such as curb weight, motor parameters, transmission system parameters, etc., an accurate vehicle model is established in the simulation software. The model includes two drive modes, pure electric rear-wheel drive and pure electric four-wheel drive, for comparative analysis. Then, define the climbing condition, such as setting the vehicle to climb at a certain speed (such as low speed or medium speed) on a good road surface. At the same time, set the simulation parameters, such as inputting the vehicle's motor torque, transmission efficiency, rolling friction resistance and other parameters, and set different slope values ​​to simulate different climbing conditions. Finally, run the simulation task of vehicle climbing in the simulation software, observe and record the vehicle's driving status on different slopes, including vehicle speed, motor output power, etc., and analyze the simulation results to find out the maximum speed that the vehicle can maintain on different slopes. Then, based on the maximum speed and the corresponding slope, draw the climbing ability curve under pure electric rear-wheel drive and pure electric four-wheel drive modes.

[0086] In this embodiment, after the first limit slope value corresponding to the pure electric rear-wheel drive mode and the second limit slope value corresponding to the pure electric four-wheel drive mode are obtained through simulation, generally speaking, since the four-wheel drive system can provide better traction and stability, the second limit slope value (the maximum slope in the pure electric four-wheel drive mode) is usually greater than or equal to the first limit slope value (the maximum slope in the pure electric rear-wheel drive mode). For example, the first limit slope value corresponding to the pure electric rear-wheel drive mode obtained by simulation is 40%, and the second limit slope value corresponding to the pure electric four-wheel drive mode is 100%.

[0087] Therefore, the actual maximum gradeability of the vehicle, that is, the maximum slope that the vehicle can actually overcome, should be between the first limit slope value of the pure electric rear-wheel drive mode and the second limit slope value of the pure electric four-wheel drive mode. Secondly, considering that the maximum slope in the pure electric four-wheel drive mode obtained by simulation is biased towards the theoretical value, and the maximum slope that the actual vehicle can overcome during the climbing process is often smaller than the simulation value due to the influence of the road surface, wind speed, etc., when determining the slope threshold value based on the first limit slope value of the pure electric rear-wheel drive mode and the second limit slope value of the pure electric four-wheel drive mode, the product between the second limit slope value of the pure electric four-wheel drive mode and the preset ratio can be determined as the maximum slope that the vehicle can actually overcome, that is, the slope threshold value.

[0088] Specifically, by calculating the product between the second limit slope value and the preset ratio, when the product is greater than the first limit slope value, the product result is determined as the slope threshold value, and when the product result is less than or equal to the first limit slope value, the first limit slope value is determined as the slope threshold value. For example, based on the simulation result that the first limit slope value corresponding to the pure electric rear-wheel drive mode is 40%, and the second limit slope value corresponding to the pure electric four-wheel drive mode is 90%, assuming that the preset ratio is 0.9, the product between the second limit slope value and the preset ratio is 90%×0.9=81%, and the product result is greater than the first limit slope value of 40%, so the slope threshold value is finally determined to be 81%.

[0089] This embodiment obtains the first limit slope value corresponding to the pure electric rear-wheel drive mode and the second limit slope value corresponding to the pure electric four-wheel drive mode through simulation, so as to more comprehensively understand the climbing performance of the vehicle under different driving modes, and determine the maximum climbing ability of the vehicle by comparing the limit slope values ​​under the pure electric rear-wheel drive and pure electric four-wheel drive modes, which helps to eliminate the one-sidedness that may be caused by the evaluation of a single driving mode, improve the accuracy and comprehensiveness of the vehicle climbing performance evaluation, and finally obtain a more accurate slope threshold. In addition, the determined slope threshold will be used in the subsequent judgment process of the conditions for prohibiting the start of the engine, thereby controlling the start of the engine more reasonably and effectively.

[0090] Please refer to Figure 3 Based on the same inventive concept, a second aspect of an embodiment of the present application provides a hill climbing control device for a hybrid vehicle. The hill climbing control device 300 for a hybrid vehicle includes: The first judgment module 301 is used to obtain the first operating condition information of the vehicle when the vehicle is in a pure electric climbing state; The second judgment module 302 is used to obtain the second operating condition information of the vehicle when it is determined that the first operating condition information meets the engine disabling enabling condition; The start prohibition module 303 is used to prohibit starting the engine when the second operating condition information meets the engine prohibition condition.

[0091] Optionally, the first operating condition information includes the current vehicle speed or the torque output capacity of the vehicle; the torque output capacity of the vehicle includes the first driving capacity of the engine and the second driving capacity of the front drive motor; the device further includes: The enabling condition judgment module is used to determine whether the first operating condition information satisfies the engine disabling enabling condition when the current vehicle speed is less than the vehicle speed threshold or the first driving capability is less than the second driving capability.

[0092] Optionally, the second operating condition information includes an actual slope value, a current remaining power of the power battery, and a current maximum discharge power; and the device further includes: The disabling condition judgment module is used to determine that the second operating condition information meets the engine disabling condition when the current remaining power is greater than the power threshold, the current maximum discharge power is greater than the power threshold and the actual slope value is greater than the slope threshold.

[0093] Optionally, the device further comprises: A temperature power meter acquisition module is used to acquire a temperature power meter, where the temperature power meter is used to characterize the corresponding relationship between the battery temperature and the battery power threshold; The power threshold determination module is used to determine the power threshold of the battery based on the battery temperature and the temperature power meter.

[0094] Optionally, the device further comprises: A climbing power meter acquisition module is used to acquire a climbing power meter, where the climbing power meter is used to characterize the corresponding relationship between the vehicle speed, the actual slope value and the power threshold of the battery; The power threshold determination module is used to determine the power threshold of the battery based on the vehicle speed, the actual slope value and the climbing power table.

[0095] Optionally, the device further comprises: A limit slope value acquisition module, used to acquire a first limit slope value corresponding to the pure electric rear-wheel drive mode and a second limit slope value corresponding to the pure electric four-wheel drive mode; The slope threshold determination module is used to determine the slope threshold based on the first limit slope value and the second limit slope value.

[0096] Optionally, the startup prohibition module 303 includes: A prohibition sign activation submodule, used to activate the engine start prohibition sign when the second operating condition information meets the preset engine prohibition condition; The start prohibition judgment submodule is used to prohibit starting the engine when the activation time of the engine start prohibition flag exceeds a time threshold.

[0097] Optionally, the disabling condition judgment module is further used to: When the current remaining power is less than or equal to the power threshold, or the current maximum discharge power is less than or equal to the power threshold, or the actual slope value is less than or equal to the slope threshold, or the vehicle has a driving fault, it is determined that the second operating condition information does not meet the engine disabling condition.

[0098] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0099] On the third aspect, based on the same inventive concept, an embodiment of the present application provides a storage medium, in which machine executable instructions are stored. When the machine executable instructions are executed by a processor, the hybrid vehicle climbing control method proposed in the first aspect of the present application is implemented.

[0100] It should be noted that the specific implementation of the storage medium in the embodiment of the present application refers to the specific implementation of the hybrid vehicle climbing control method proposed in the first aspect of the embodiment of the present application, and will not be repeated here.

[0101] In the fourth aspect, based on the same inventive concept, refer to Figure 4 An embodiment of the present application provides a vehicle 400, including a processor 401 and a memory 402; the memory 402 stores machine executable instructions that can be executed by the processor 401, and the processor 401 is used to execute the machine executable instructions to implement the hybrid vehicle climbing control method proposed in the first aspect of the present application.

[0102] It should be noted that the specific implementation of the vehicle 400 in the embodiment of the present application refers to the specific implementation of the hybrid vehicle climbing control method proposed in the first aspect of the embodiment of the present application, and will not be repeated here.

[0103] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0104] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, devices, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0105] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0106] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0107] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable terminal device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0108] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0109] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0110] The above is a detailed introduction to the hill climbing control method, medium and vehicle of a hybrid vehicle provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for controlling hill climbing of a hybrid vehicle, characterized in that: The method comprises: When the vehicle is in a pure electric climbing state, obtaining first operating condition information of the vehicle; When it is determined that the first operating condition information satisfies the engine disabling enabling condition, obtaining second operating condition information of the vehicle; When the second operating condition information satisfies the engine disabling condition, starting the engine is prohibited.

2. The method according to claim 1, characterized in that The first operating condition information includes the current vehicle speed or the torque output capacity of the vehicle, and the torque output capacity of the vehicle includes the first driving capacity of the engine and the second driving capacity of the front drive motor; The method further comprises: When the current vehicle speed is less than a vehicle speed threshold, or the first driving capability is less than the second driving capability, it is determined that the first operating condition information satisfies the engine disabling enabling condition.

3. The method according to claim 1, characterized in that The second operating condition information includes an actual slope value, a current remaining power of the power battery, and a current maximum discharge power; the method further includes: When the current remaining power is greater than the power threshold, the current maximum discharge power is greater than the power threshold, and the actual slope value is greater than the slope threshold, it is determined that the second operating condition information satisfies the engine disabling condition.

4. The method according to claim 3, characterized in that The method further comprises: Acquire a temperature power meter, where the temperature power meter is used to characterize a corresponding relationship between a battery temperature and a battery power threshold; A battery charge threshold of the battery is determined based on the battery temperature and the temperature charge gauge.

5. The method according to claim 3, characterized in that: The method further comprises: Acquire a climbing power meter, where the climbing power meter is used to characterize the corresponding relationship between the vehicle speed, the actual slope value, and the power threshold of the battery; A power threshold of the battery is determined based on the vehicle speed, the actual slope value and the hill climbing power table.

6. The method according to claim 3, characterized in that The method further comprises: Obtaining a first limit slope value corresponding to a pure electric rear-wheel drive mode and a second limit slope value corresponding to a pure electric four-wheel drive mode; The gradient threshold is determined based on the first limiting gradient value and the second limiting gradient value.

7. The method according to claim 1, characterized in that When the second operating condition information satisfies a preset engine disabling condition, prohibiting starting the engine includes: When the second operating condition information satisfies a preset engine disabling condition, activating an engine start prohibition flag; When the activation time of the engine start prohibition flag exceeds a time threshold, starting the engine is prohibited.

8. The method according to claim 3, characterized in that The method further comprises: When the current remaining power is less than or equal to the power threshold, or the current maximum discharge power is less than or equal to the power threshold, or the actual slope value is less than or equal to the slope threshold, or the vehicle has a driving fault, it is determined that the second operating condition information does not meet the engine disabling condition.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the hill climbing control method for a hybrid vehicle as claimed in any one of claims 1 to 8 is implemented.

10. A vehicle, characterized in that: It comprises a processor and a memory; the memory stores machine executable instructions that can be executed by the processor, and the processor is used to execute the machine executable instructions to implement the hill climbing control method for a hybrid vehicle as described in any one of claims 1 to 8.

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