Control method and control device for hybrid electric vehicle in high altitude area

Abstract

The invention provides a control method and device for a hybrid electric vehicle in a high-altitude area. The control method comprises the steps that whether current power output in the high-altitude area is insufficient or not is determined according to running parameters, obtained in real time, of the hybrid electric vehicle; if it is determined that the current power output is insufficient, at least one target power dimension is selected from power dimensions related to the power output of the hybrid electric vehicle; wherein the power dimension comprises a power battery guarantee electric quantity threshold value, a power battery power distribution mode, a whole vehicle torque distribution mode, a driving mode and a gear shifting point corresponding speed in the downhill process; and under each target power dimension, the hybrid electric vehicle is controlled through a preset control strategy corresponding to the target power dimension in the high-altitude area power mode, so that the power output of the hybrid electric vehicle is improved. In this way, control strategy optimization can be conducted aiming at insufficient power of the hybrid electric vehicle in the high-altitude area, and the problem that the insufficient power of the whole vehicle is affected due to the fact that engine power is limited is solved.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid vehicle, and in particular to a control method and a control device for a hybrid vehicle in high altitude areas. Background Art

[0002] In plateau areas, especially above 3,500 meters above sea level, the engine's air intake is insufficient due to thin air, fuel combustion is incomplete, and power output is weakened. When climbing a slope or getting out of trouble on an unpaved road or starting the vehicle, the power is obviously insufficient. At the same time, the engine's carbon load (i.e. carbon deposits) increases, which easily triggers the regeneration mechanism, further affecting the car's power output and driving experience.

[0003] For hybrid vehicles, although they are assisted by electric motors, the power of the power battery will drop rapidly when climbing a slope or getting out of trouble for a long time, so that the power of the whole vehicle can only be maintained at a good level for a short time. After that, the high power of the whole vehicle can only be maintained by the hybrid engine. Therefore, the power of the engine is limited and cannot meet the power needs of the driver, and even affect the safety of the whole vehicle and driving. Summary of the invention

[0004] In view of this, the purpose of this application is to provide a control method and control device for hybrid vehicles in high-altitude areas, which can optimize the control strategy for the insufficient power of hybrid vehicles in high-altitude areas, make up for the problem of insufficient power of the whole vehicle due to limited engine power, and improve the safety of the whole vehicle and driving experience.

[0005] The present application embodiment provides a control method for a hybrid electric vehicle in a high altitude area, the control method comprising:

[0006] Obtain the operating parameters of hybrid vehicles in real time;

[0007] determining, based on the operating parameters, whether a current power output of the hybrid vehicle is insufficient in a high altitude area;

[0008] If it is determined that the current power output of the hybrid vehicle is insufficient, at least one target power dimension is selected from power dimensions related to the power output of the hybrid vehicle; wherein the power dimensions include: a power battery power conservation threshold, a power battery power distribution method, a vehicle torque distribution method, a driving mode, and a speed corresponding to a shift point during downhill driving;

[0009] Under each target power dimension, the hybrid vehicle is controlled by a control strategy corresponding to the target power dimension in a preset high-altitude power mode to improve the power output of the hybrid vehicle.

[0010] Furthermore, the control method further includes:

[0011] Acquiring a navigation destination of the hybrid electric vehicle;

[0012] When it is determined according to the navigation destination and the operating parameters that the hybrid vehicle meets a preset condition, the hybrid vehicle is controlled to exit the high altitude power mode and preferentially use the pure electric driving mode to travel to the navigation destination;

[0013] Among them, the operating parameters include: the current carbon load and the current road type; the preset conditions include: the altitude of the navigation destination is lower than a preset threshold, the current carbon load is lower than the carbon load threshold that triggers regeneration, the current road type is a paved road, and the predicted remaining power of the hybrid vehicle when traveling from the current position to the navigation destination in pure electric driving mode is greater than the power battery power conservation threshold in non-high altitude areas.

[0014] Further, when the target power dimension is the power battery power conservation threshold, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a pre-set high altitude power mode includes:

[0015] Determining a reference value of the power battery power reserve according to the current altitude of the hybrid vehicle; wherein the reference value of the power battery power reserve is positively correlated with the altitude;

[0016] determining a driving condition of the hybrid vehicle according to the operating parameters;

[0017] Determining a compensation value of the power battery power conservation amount according to the driving condition and the current altitude; wherein the compensation value of the power battery power conservation amount is positively correlated with the intensity of the driving condition and / or the altitude;

[0018] The power battery power conservation capacity threshold is determined according to the sum of the reference value and the compensation value of the power battery power conservation capacity.

[0019] Further, when the target power dimension is the power battery power distribution mode, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a preset high altitude power mode includes:

[0020] Limit high-voltage electricity use that is not related to vehicle power output;

[0021] The power difference between the maximum power of the power battery and the DCDC power is determined, and the power battery thermal management power is determined as a smaller value between the required power and the power difference to ensure the DCDC power.

[0022] Further, when the target power dimension is the vehicle torque distribution mode, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a preset high altitude power mode includes:

[0023] determining a driving condition of the hybrid vehicle according to the operating parameters;

[0024] When the driving condition is of the first intensity, the vehicle torque is preferentially allocated to the motor, and the remaining torque is allocated to the engine; until the motor reaches the base speed point, the allocation slope is determined according to the current torque of the motor, and the current torque of the motor is allocated to the engine according to the allocation slope.

[0025] Furthermore, the controlling of the hybrid vehicle by the control strategy corresponding to the target power dimension in the preset high altitude power mode also includes:

[0026] When the driving condition is at the second intensity, or when the driver's instantaneous power increase intention is detected when the driving condition is at the first intensity, the vehicle torque is preferentially allocated to the engine; wherein the second intensity is greater than the first intensity.

[0027] Further, when the target power dimension is the driving mode, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a preset high altitude power mode includes:

[0028] When the carbon load is greater than the first threshold and less than or equal to the second threshold, and the power of the power battery is greater than the difference between the power battery power conservation threshold and the preset power value, the engine direct drive driving mode is used preferentially;

[0029] When the carbon load is greater than the first threshold and less than or equal to the second threshold, and the power of the power battery is less than or equal to the difference between the power reserve power threshold of the power battery and the preset power value, the series or parallel mode is used;

[0030] When the carbon load is greater than a second threshold value and the power battery power is greater than a preset power threshold value, the engine direct drive driving mode is forced to be used;

[0031] When the carbon load is greater than the second threshold and the power of the power battery is less than or equal to a preset power threshold, the parallel mode is forced to be used.

[0032] Further, when the target power dimension is the speed corresponding to the shift point during the downhill process, the hybrid vehicle is controlled by a control strategy corresponding to the target power dimension in a preset high altitude power mode, including:

[0033] Determining a speed compensation value corresponding to a shift point according to a current altitude of the hybrid vehicle;

[0034] Determining the speed corresponding to the shift point during downhill in a high altitude area according to the sum of the speed compensation value corresponding to the shift point and the original speed corresponding to the shift point;

[0035] When it is detected that the hybrid vehicle triggers the downhill mode in the high altitude area, the gear is switched according to the speed corresponding to the shift point during the downhill process in the high altitude area.

[0036] The embodiment of the present application also provides a control device for a hybrid electric vehicle in a high altitude area, the control device comprising:

[0037] An acquisition module, used for acquiring the operating parameters of the hybrid electric vehicle in real time;

[0038] a determination module, configured to determine whether the current power output of the hybrid vehicle is insufficient in a high altitude area according to the operating parameters;

[0039] A selection module is configured to select at least one target power dimension from power dimensions related to the power output of the hybrid vehicle if it is determined that the current power output of the hybrid vehicle is insufficient; wherein the power dimensions include: a power battery power conservation threshold, a power battery power distribution method, a vehicle torque distribution method, a driving mode, and a speed corresponding to a shift point during a downhill slope;

[0040] The control module is used to control the hybrid vehicle under each target power dimension through a control strategy corresponding to the target power dimension in a preset high-altitude power mode to improve the power output of the hybrid vehicle.

[0041] An embodiment of the present application also provides an electronic device, including: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of the control method for hybrid vehicles in high altitude areas as described above are performed.

[0042] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the control method for a hybrid electric vehicle in a high altitude area as described above are executed.

[0043] The embodiment of the present application provides a control method and control device for a hybrid vehicle in high altitude areas. When it is determined that the current power output of the hybrid vehicle in high altitude areas is insufficient, the power of the hybrid vehicle can be increased from at least one power dimension, and the power dimension includes the power battery power conservation threshold, the power battery power distribution method, the vehicle torque distribution method, the driving mode, and the speed corresponding to the shift point during the downhill process. In this way, the control strategy can be optimized in a variety of ways for the lack of power of the hybrid vehicle in high altitude areas, which is suitable for different driving scenarios, comprehensively compensates for the problem of insufficient power of the whole vehicle due to limited engine power, and improves the safety of the whole vehicle and the driving experience.

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A flow chart showing a control method for a hybrid electric vehicle in a high altitude area provided by an embodiment of the present application is shown;

[0047] Figure 2 A schematic diagram of the structure of a control device for a hybrid vehicle in a high altitude area provided by an embodiment of the present application is shown;

[0048] Figure 3 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0049] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0050] Research has found that in plateau areas, especially above 3,500 meters above sea level, the engine's air intake is insufficient, fuel combustion is incomplete, and power output is weakened due to thin air. When climbing a slope or getting out of trouble on an unpaved road or starting the vehicle, the power is obviously insufficient. At the same time, the engine's carbon load (i.e. carbon deposits) increases, which easily triggers the regeneration mechanism, further affecting the car's power output and driving experience.

[0051] For hybrid vehicles, although they are assisted by electric motors, the power of the power battery will drop rapidly when climbing a slope or getting out of trouble for a long time, so that the power of the whole vehicle can only be maintained at a good level for a short time. After that, the high power of the whole vehicle can only be maintained by the hybrid engine. Therefore, the power of the engine is limited and cannot meet the power needs of the driver, and even affect the safety of the whole vehicle and driving.

[0052] Based on this, an embodiment of the present application provides a control method for a hybrid vehicle in high altitude areas, so as to optimize the control strategy for the insufficient power of the hybrid vehicle in high altitude areas, make up for the problem of insufficient power of the whole vehicle due to limited engine power, and improve the safety of the whole vehicle and driving experience.

[0053] It should be noted that as the altitude increases, the insufficient air intake of the engine affects the fuel combustion efficiency, which in turn affects the power output of the engine. Therefore, the high altitude areas in the embodiments of the present application mainly refer to areas above 3500m above sea level. The altitude of the vehicle can be determined in the following ways: determined by the GPS positioning signal sent by the BCM or converted into the altitude based on the atmospheric pressure signal of the engine. When it is determined that the hybrid vehicle is in a high altitude area based on the altitude, the control method of the hybrid vehicle in a high altitude area in the embodiments of the present application can be executed. It can be specifically executed by a controller in the vehicle, such as a hybrid control unit HCU.

[0054] See below Figure 1 , Figure 1 This is a flow chart of a control method for a hybrid vehicle in high altitude areas provided by an embodiment of the present application. Figure 1 As shown in, the control method provided by the embodiment of the present application includes:

[0055] S101. Acquire operating parameters of the hybrid electric vehicle in real time.

[0056] Here, the operating parameters include various parameters involved in the operation of the hybrid vehicle, which are collected, measured and generated by various components in the vehicle and obtained by the controller through in-vehicle communication.

[0057] S102: Determine whether the current power output of the hybrid vehicle is insufficient in a high altitude area according to the operating parameters.

[0058] In this step, first, the current driving condition of the hybrid vehicle in a high altitude area can be determined according to the operating parameters to determine whether the current driving condition belongs to a preset specific driving condition. Exemplarily, the specific driving condition may include a condition of continuous escape from trouble for the whole vehicle, a condition of starting from a hill, etc. At this time, the operating parameters may include the throttle opening, the vehicle speed, the tire status, etc. Specifically, if it is detected that the throttle opening is greater than the preset opening threshold, and the vehicle speed is less than the preset vehicle speed threshold; or, after the accelerator is pressed (there is a certain throttle opening), the vehicle speed is less than the preset vehicle speed threshold within a predetermined time; or, it is detected that the wheel is in a slipping state for more than a preset time; then it can be determined that the current driving condition belongs to a preset specific driving condition.

[0059] Afterwards, it can be determined whether the current power output is insufficient based on specific driving conditions; for example, if multiple specific driving conditions are recognized within the predetermined time window, more than 5 times within 60 seconds, and the current SOC is reduced by more than 10% of the original during this stage, it can be determined that the current power output is insufficient.

[0060] In addition, if the carbon load (carbon deposits) increases, it may trigger frequent regeneration of the hybrid vehicle and affect the driving experience. Therefore, it can also be determined that the current power output of the hybrid vehicle is insufficient based on the carbon load exceeding the preset threshold.

[0061] S103: If it is determined that the current power output of the hybrid vehicle is insufficient, selecting at least one target power dimension from power dimensions related to the power output of the hybrid vehicle.

[0062] Among them, the power dimension includes: power battery power conservation threshold, power battery power distribution method, vehicle torque distribution method, driving mode and the corresponding speed of the shift point during downhill.

[0063] In this step, if it is determined that the current power output of the hybrid vehicle is insufficient, at least one target power dimension can be selected, so that the control strategy for power shortage can be optimized from multiple dimensions, which is suitable for different models and different driving scenarios to meet more diverse power improvement needs. Furthermore, the target power dimension can be selected according to the degree of power shortage, that is, when the power output is seriously insufficient, a larger number of target power dimensions can be selected to achieve a more significant power improvement.

[0064] S104. Under each target power dimension, the hybrid vehicle is controlled by a control strategy corresponding to the target power dimension in a preset high-altitude power mode to improve the power output of the hybrid vehicle.

[0065] Here, the control method provided in the embodiment of the present application pre-sets a high-altitude power mode, and when it is determined that the hybrid vehicle is in a high-altitude area, the high-altitude power mode can be activated. The high-altitude power mode includes a control strategy corresponding to each power dimension related to the power output of the hybrid vehicle, and the hybrid vehicle is controlled according to the control strategy to achieve the effect of improving the power output.

[0066] The following will specifically introduce how the control strategy corresponding to each power dimension can improve power output.

[0067] In a first possible implementation manner, when the target power dimension is the power battery power conservation threshold, controlling the hybrid vehicle by using a control strategy corresponding to the target power dimension in a pre-set high altitude power mode in step S104 may include:

[0068] Step a1: determining a reference value of the power reserve capacity of the power battery according to the current altitude of the hybrid vehicle.

[0069] Among them, the reference value of the power battery power reserve is positively correlated with the altitude.

[0070] Since the power performance of the current engine becomes weaker as the altitude increases, in order to ensure the continuous power output of the vehicle when driving, a certain power value can be added to the power conservation threshold of the original strategy and used as a reference value to ensure the driver's power performance of driving the vehicle out of trouble and climbing in high altitude areas. For example, the relationship between the altitude and the reference value of the power conservation power of the power battery can be referred to in the following Table 1.

[0071] Table 1 Correspondence between altitude and reference value of power battery power reserve

[0072]

[0073] When the battery power is higher than the power conservation threshold, the hybrid vehicle can be driven in pure electric mode. When the battery power is lower than the power conservation threshold, the hybrid vehicle enters hybrid mode to charge the battery. Therefore, within a certain altitude range, the higher the altitude, the higher the power conservation threshold is set. In this way, hybrid vehicles can use the engine and motor to drive together more times, thereby improving power and alleviating the problem of limited engine power in plateaus.

[0074] In specific implementation, if the power battery power conservation threshold value set by the driver through the instrument is lower than the benchmark value corresponding to different altitudes, the driver can be prompted through text "Due to the high altitude, please set the power battery power conservation threshold value to no less than xx" to prevent the power battery power conservation threshold value in the high altitude mode from being changed due to the driver's settings.

[0075] Step a2: determining the driving condition of the hybrid vehicle according to the operating parameters.

[0076] For example, when the driver's throttle opening is greater than 90%, and the vehicle speed is less than 5 km / h or wheel slip is detected for more than 10,000 ms, if it is recognized more than 5 times in total within 60 seconds, and the current SOC is reduced by more than 10% of the original during this stage, it is determined that a specific intense driving condition has occurred and the power battery power conservation capacity needs to be further compensated.

[0077] Step a3: Determine a compensation value for the power battery power conservation amount according to the driving condition and the current altitude.

[0078] Step a4: determining the power battery power conservation capacity threshold value according to the sum of the reference value and the compensation value of the power battery power conservation capacity.

[0079] Among them, the compensation value of the power battery power reserve is positively correlated with the intensity of the driving condition and / or the altitude. That is to say, the more intense the driving condition (i.e., the more serious the degree of power shortage) and / or the higher the current altitude, the greater the compensation value, and the sum of the baseline value and the compensation value of the power battery power reserve, i.e., the power battery power reserve threshold value is also higher. Among them, the intensity of the driving condition can be determined by determining the value of the operating parameters of the driving condition. Exemplarily, the relationship between the altitude and the compensation value of the power battery power reserve can be referred to the following Table 2.

[0080] Table 2 Corresponding relationship between altitude and compensation value of power battery power reserve

[0081]

[0082] The intense driving condition recognition in the embodiment of the present application is mainly aimed at the needs of the current driving condition. When the vehicle is currently on a road with poor road conditions and insufficient power output, the maximum power battery power conservation threshold based on altitude compensation is saved in RAM to ensure that there is enough power to deal with emergencies. When the intense driving condition is not triggered in multiple consecutive driving cycles, the compensation value of the power battery power conservation is cleared, that is, the reference value of the power battery power conservation is determined as the power battery power conservation threshold.

[0083] In a second possible implementation, when the target power dimension is the power battery power distribution mode, controlling the hybrid vehicle by using a control strategy corresponding to the target power dimension in a preset high altitude power mode in step S104 may include:

[0084] Step b1: limit high-voltage electricity consumption that is not related to the power output of the vehicle.

[0085] For example, high-voltage electricity that is not related to the power output of the entire vehicle may include cooling or heating power for the cab.

[0086] Step b2: determine the power difference between the maximum power of the power battery and the DCDC power, and determine the power battery thermal management power as the smaller value between the required power and the power difference to ensure the DCDC power.

[0087] In this step, since DCDC mainly supplies power to low voltage, if this power is limited, it will affect the power supply of all controllers of the whole vehicle. Therefore, there is no limit on the DCDC power to ensure the DCDC power. Specifically, the required power and (maximum discharge power of the power battery - DCDC power) can be minimized and output to the thermal management power of the power battery. In this way, non-essential high-voltage power consumption can be limited to ensure the power output power.

[0088] In a third possible implementation, when the target power dimension is the vehicle torque distribution mode, controlling the hybrid vehicle by using a control strategy corresponding to the target power dimension in a preset high altitude power mode in step S104 may include:

[0089] Step c1, determining the driving condition of the hybrid vehicle according to the operating parameters.

[0090] For example, when the throttle is greater than 90%, the current vehicle speed is less than 3 km / h or the vehicle speed has been less than 5 km / h for 3 consecutive seconds after the driver steps on the accelerator, and the power battery SOC is greater than 20%, it can be judged that the current driving condition is a continuous escape and hill-climbing start condition for the vehicle. This indicates that the power output of the vehicle is insufficient on the plateau, the driving condition is the first intense level, and a strategy to improve the vehicle's power is needed.

[0091] Step c2: when the driving condition is of the first intensity, the vehicle torque is preferentially allocated to the motor, and the remaining torque is allocated to the engine; until the motor reaches the base speed point, the allocation slope is determined according to the current torque of the motor, and the current torque of the motor is allocated to the engine according to the allocation slope.

[0092] It should be noted that before the base speed point, the motor can output at a constant torque with maximum torque, but after reaching the base speed point, the torque of the motor will gradually decrease and the speed will gradually increase to maintain constant power output.

[0093] Therefore, under the first intense driving condition, the driver continues to output power with a large throttle, and the carbon load of the engine is more likely to increase. If the torque distribution of the engine is reduced, the carbon load output of the engine is low at this time. In order to prevent the danger of the vehicle being unable to drive due to engine failure caused by the increase in carbon load during subsequent driving, combined with the motor torque response characteristics, when it is detected that the power battery is greater than 20%, the vehicle torque distribution is prioritized by the motor torque distribution, and the remaining torque is distributed to the engine. When the motor base speed point is reached, the torque distributed from the motor is gradually distributed to the engine according to a certain slope, and the descending slope is looked up in the table according to the current motor torque, or the specific torque distribution is distributed according to the original distribution strategy when the high-altitude power mode is not activated. At this time, it can ensure that the driver can respond quickly to torque when there is a large torque demand. For example, the relationship between the current motor torque and the distribution slope can be referred to in Table 3 below.

[0094] Table 3 Correspondence between current motor torque and distribution slope

[0095]

[0096] Furthermore, in step S104, controlling the hybrid vehicle by using a control strategy corresponding to the target power dimension in a preset high altitude power mode may also include:

[0097] When the driving condition is at the second intensity, or when the driver's instantaneous power increase intention is detected when the driving condition is at the first intensity, the vehicle torque is preferentially allocated to the engine; wherein the second intensity is greater than the first intensity.

[0098] In specific implementation, if it is detected that the driver has the intention of instantaneous power increase under the first intense driving condition, or if it is detected that the driving condition is the more intense second intense level; the current motor-priority torque distribution strategy is canceled and the vehicle torque is preferentially distributed to the engine.

[0099] Among them, the instantaneous power boost intention can be a launch start intention, which can be triggered by the driver by pressing the brake and accelerator at the same time, or by pressing a preset button on the vehicle. This is because if the accelerator and brake are pressed at the same time, if the vehicle's required torque is allocated to the motor first, the motor is more likely to generate heat, stall, etc., which can easily cause damage to high-voltage electrical components or reduce durability. Therefore, although the torque is allocated to the engine first, the response is slow, but during the time the driver is preparing for the launch start, the engine's response torque time fully meets the driver's power needs, which can improve power output and ensure vehicle safety.

[0100] Among them, the intensity of the driving condition can be determined according to the operating parameters. Corresponding to the example in step c1, when the throttle is greater than 90%, the vehicle speed remains at 0 km / h for 10 seconds, which means that the vehicle is seriously stuck. The vehicle speed is always 0, and the driver almost demands full throttle. The power output is seriously insufficient, and the intensity of the driving condition is further upgraded to the second intensity. At this time, maintaining this condition for a long time will have an adverse effect on the heat generation and stalling of the motor, and cannot maintain the driver's torque demand well, and it is easy to cause the loss of parts. At this time, the vehicle torque can also be allocated to the engine first.

[0101] In a fourth possible implementation, when the target power dimension is the driving mode, controlling the hybrid vehicle by using a control strategy corresponding to the target power dimension in a preset high altitude power mode in step S104 may include:

[0102] Step d1: when the carbon load is greater than a first threshold value and less than or equal to a second threshold value, and the power of the power battery is greater than the difference between the power battery power conservation power threshold value and a preset power value, the engine direct drive driving mode is preferentially used;

[0103] Step d2: when the carbon load is greater than the first threshold and less than or equal to the second threshold, and the power of the power battery is less than or equal to the difference between the power reserve power threshold of the power battery and the preset power value, use the series or parallel mode;

[0104] Step d3: when the carbon load is greater than the second threshold value and the power battery power is greater than the preset power threshold value, the engine direct drive driving mode is forced to be used;

[0105] Step d4: When the carbon load is greater than the second threshold and the power of the power battery is less than or equal to the preset power threshold, the parallel mode is forced to be used.

[0106] It should be noted that the existing hybrid driving mode does not take into account the operating conditions where the engine is insufficiently powered at high altitudes and is more likely to increase carbon load, and is more likely to trigger a regeneration strategy. Even a significant increase in carbon load will limit the engine torque, affecting the normal driving of the entire vehicle. The embodiment of the present application adjusts the hybrid driving mode under the power mode in high-altitude areas, increases the engine's operating power and speed, promptly increases the temperature of the engine's post-processing, and increases the chance of engine regeneration to reduce carbon load.

[0107] Exemplarily, when the carbon load is less than or equal to the first threshold (eg, 15 g), the carbon load is not very large, and based on the current driving mode, the engine will not enter a torque limiting or fault mode, and no special treatment is performed.

[0108] When the carbon load is greater than or equal to the first threshold (15g), and the power battery SOC is greater than the power battery power conservation threshold - preset power value (for example, 10%), the engine direct drive mode has the highest priority, unless the driver forces the switch to pure electric or other modes. If the power battery SOC is less than or equal to the power battery power conservation threshold - preset power value (for example, 10%), the series mode is used for power generation for the dual motor coupler, which can not only charge the power battery to ensure that the power battery SOC is sufficient, but also increase the engine's operating speed to improve the engine's regeneration efficiency. The power generation power can be determined by looking up the table according to different altitudes and current engine power. The specific power generation power in the table is determined according to different models and actual engine capabilities until the power battery SOC is greater than the power conservation threshold; for the P2 hybrid system, the parallel mode can be used for power generation, and part of the engine power is used to drive the whole vehicle, and part is used for motor power generation. The specific power generation power can also be determined by looking up the table, and the specific power generation power is determined according to different models and actual engine capabilities. For example, the relationship between power generation power, altitude and engine power can be referred to Table 4 below.

[0109] Table 4 Correspondence between power generation, altitude and engine power

[0110] Altitude(m) 3500 4000 4300 4700 5000 5500 Engine power(Kw) 10 1 1 1 1 1.2 1.5 20 1.2 1.2 1.2 1.2 1.5 1.7 30 1.5 1.7 1.7 2.0 2.0 2.2 40 1.7 1.9 1.9 2.1 2.3 2.5 50 2.0 2.2 2.5 2.5 2.7 3 70 2.5 2.5 2.7 3.0 3.0 3.3 90 2.5 2.7 2.9 3.1 3.3 3.5 120 3 3 3.2 3.4 3.6 3.8 150 3 3.5 3.5 3.7 3.9 4.2 180 4 4 4.2 4.5 4.7 5 200 5 5.2 5.4 5.6 5.8 6

[0111] When the carbon load is greater than the second threshold (for example, 30g) and the power battery SOC is greater than the preset power threshold (for example, 90%), the engine direct drive mode is forced to be used. Even if the driver switches the driving mode, it will not be switched, and the driver will be prompted that "the engine is regenerating and the driving mode cannot be switched temporarily."

[0112] When the power battery SOC is less than the preset power threshold, the parallel mode is forced to be used. Even if the driver switches the driving mode, it will not switch, and the driver will be prompted that "the engine is regenerating and the driving mode cannot be switched temporarily". In this way, part of the engine power is used to drive the entire vehicle, and the other part of the power drives the generator to charge. Furthermore, at this time, the control method also includes: when the driver's required power is less than a certain proportion of the engine's optimal power (for example, 0.7 times the engine's optimal power), the engine runs at the current power; when the driver's required power is greater than 0.7 times the engine's optimal power, then the current driver's required power point is +7kw as the engine's operating power, where 7kw is the engine's power generation power, but the engine's operating power cannot be higher than the engine's maximum power point. The purpose is to prevent the carbon load from continuing to increase, and the engine's continuous operation and post-processing temperature continue to increase, which helps the engine to regenerate.

[0113] In a fifth possible implementation, when the target power dimension is the speed corresponding to the shift point during the downhill process, controlling the hybrid vehicle by using a control strategy corresponding to the target power dimension in a preset high altitude power mode in step S104 may include:

[0114] Step e1: determining a speed compensation value corresponding to a shift point according to the current altitude of the hybrid vehicle.

[0115] Step e2: determining the speed corresponding to the shift point during the downhill process in the high altitude area according to the sum of the speed compensation value corresponding to the shift point and the original speed corresponding to the shift point.

[0116] Step e3: when it is detected that the hybrid vehicle triggers the downhill mode in the high altitude area, the gear is switched according to the speed corresponding to the shift point during the downhill process in the high altitude area.

[0117] Research has found that because the air in plateau areas is thin, incomplete fuel combustion can easily cause an increase in the carbon load of the engine, which in turn triggers the engine torque limit. At this time, if you are in a driving condition of climbing or getting out of trouble, the carbon load is more likely to increase under high-throttle driving conditions. According to actual tests, under the above conditions, sometimes engine regeneration cannot maintain a low carbon load, and the carbon load may continue to increase. In order to further solve the problem of increased carbon load, the embodiment of the present application also considers optimizing the shift point.

[0118] Specifically, after the downhill mode is triggered in high-altitude areas, the shift point is raised as much as possible so that the transmission is kept in a low gear as much as possible. This is because the speed in a low gear is relatively large, the engine speed is relatively high at the same vehicle speed, and the carbon load is less under the condition of engine drag without stepping on the accelerator. Therefore, this strategy optimization will avoid the problem that the engine drag force is small when the high gear is high, the vehicle speed may be faster and faster, the engine injection amount is small, and regeneration cannot be performed in time to reduce the carbon load. By optimizing the shift point according to the control strategy provided in the embodiment of the present application, it is possible to keep it in a low gear and maintain a high engine speed. Even if it is regenerating at this time, the engine's driving regeneration effect will be better.

[0119] In specific implementation, the speed compensation value corresponding to the shift point can be determined by a similar table lookup method based on the current altitude of the hybrid vehicle, and the sum of the speed compensation value and the original speed corresponding to the shift point can be determined as the speed corresponding to the shift point during downhill driving in high altitude areas, thereby improving the shift point.

[0120] In addition, for four-wheel drive vehicles, when it is determined that the current power output of the hybrid vehicle is insufficient, the control method provided in the embodiment of the present application can also prompt the driver to engage the four-wheel drive mode to enhance the vehicle's passability.

[0121] Furthermore, the control method in the embodiment of the present application also includes:

[0122] S105: Acquire the navigation destination of the hybrid electric vehicle.

[0123] In this step, for in-vehicle navigation, the controller can obtain the navigation destination from the vehicle system; for mobile device navigation, the controller can obtain the navigation destination by establishing a communication connection with the mobile device, or by user input.

[0124] S106: When it is determined according to the navigation destination and the operating parameters that the hybrid vehicle meets a preset condition, the hybrid vehicle is controlled to exit the high altitude power mode and preferentially use the pure electric driving mode to travel to the navigation destination.

[0125] Among them, the operating parameters include: the current carbon load and the current road type; the preset conditions include: the altitude of the navigation destination is lower than a preset threshold, the current carbon load is lower than the carbon load threshold that triggers regeneration, the current road type is a paved road, and the predicted remaining power of the hybrid vehicle when traveling from the current position to the navigation destination in pure electric driving mode is greater than the power battery power conservation threshold in non-high altitude areas.

[0126] Here, if the pure electric mode is used to drive the vehicle to the navigation destination, the target power conservation value (about 25%) in the non-plateau mode can be left after arriving at the destination, and the altitude of the destination is lower than 3500m, the current carbon load has not reached the limit for triggering regeneration, and the current road type is determined to be paved according to the navigation, and the above conditions are met for a certain time (for example, 5s), then the high-altitude power mode can be exited and restored to the normal driving mode, and the pure electric mode can be used as much as possible. The vehicle demand torque obtained according to the current driver's throttle opening and the power conservation SOC set by the driver can be lower than the actual SOC of the current power battery. In this way, it can be ensured that the engine carbon load is no longer continuously generated in the current plateau driving scenario, reducing the impact of fuel consumption caused by the thin air in the plateau, and ensuring fuel economy.

[0127] The embodiment of the present application provides a control method for a hybrid vehicle in high altitude areas. When it is determined that the current power output of the hybrid vehicle in high altitude areas is insufficient, the power of the hybrid vehicle can be increased from at least one power dimension, and the power dimension includes the power battery power conservation threshold, the power battery power distribution method, the vehicle torque distribution method, the driving mode, and the speed corresponding to the shift point during the downhill process. In this way, the control strategy can be optimized in a variety of ways for the lack of power of the hybrid vehicle in high altitude areas, which is suitable for different driving scenarios, comprehensively compensates for the problem of insufficient power of the whole vehicle due to limited engine power, and improves the safety of the whole vehicle and the driving experience.

[0128] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of a control device for a hybrid vehicle in a high altitude area provided by an embodiment of the present application. Figure 2 As shown in , the control device 200 includes:

[0129] An acquisition module 210 is used to acquire the operating parameters of the hybrid electric vehicle in real time;

[0130] A determination module 220, configured to determine whether the current power output of the hybrid vehicle is insufficient in a high altitude area according to the operating parameters;

[0131] A selection module 230 is configured to select at least one target power dimension from power dimensions related to the power output of the hybrid vehicle if it is determined that the current power output of the hybrid vehicle is insufficient; wherein the power dimensions include: a power battery power conservation threshold, a power battery power distribution method, a vehicle torque distribution method, a driving mode, and a speed corresponding to a shift point during a downhill slope;

[0132] The control module 240 is used to control the hybrid vehicle under each target power dimension by using a control strategy corresponding to the target power dimension in a preset high-altitude power mode to improve the power output of the hybrid vehicle.

[0133] Furthermore, the control module 240 is also used for:

[0134] Acquiring a navigation destination of the hybrid electric vehicle;

[0135] When it is determined according to the navigation destination and the operating parameters that the hybrid vehicle meets a preset condition, the hybrid vehicle is controlled to exit the high altitude power mode and preferentially use the pure electric driving mode to travel to the navigation destination;

[0136] Among them, the operating parameters include: the current carbon load and the current road type; the preset conditions include: the altitude of the navigation destination is lower than a preset threshold, the current carbon load is lower than the carbon load threshold that triggers regeneration, the current road type is a paved road, and the predicted remaining power of the hybrid vehicle when traveling from the current position to the navigation destination in pure electric driving mode is greater than the power battery power conservation threshold in non-high altitude areas.

[0137] Further, when the target power dimension is the power battery power conservation threshold, the control module 240 is used to control the hybrid vehicle through the control strategy corresponding to the target power dimension in the preset high altitude power mode, and the control module 240 is specifically used to:

[0138] Determining a reference value of the power battery power reserve according to the current altitude of the hybrid vehicle; wherein the reference value of the power battery power reserve is positively correlated with the altitude;

[0139] determining a driving condition of the hybrid vehicle according to the operating parameters;

[0140] Determining a compensation value of the power battery power conservation amount according to the driving condition and the current altitude; wherein the compensation value of the power battery power conservation amount is positively correlated with the intensity of the driving condition and / or the altitude;

[0141] The power battery power conservation capacity threshold is determined according to the sum of the reference value and the compensation value of the power battery power conservation capacity.

[0142] Further, when the target power dimension is the power battery power distribution mode, the control module 240 is used to control the hybrid vehicle through the control strategy corresponding to the target power dimension in the preset high-altitude power mode, and the control module 240 is specifically used to:

[0143] Limit high-voltage electricity use that is not related to vehicle power output;

[0144] The power difference between the maximum power of the power battery and the DCDC power is determined, and the power battery thermal management power is determined as a smaller value between the required power and the power difference to ensure the DCDC power.

[0145] Further, when the target power dimension is the vehicle torque distribution mode, the control module 240 is used to control the hybrid vehicle through the control strategy corresponding to the target power dimension in the preset high-altitude power mode, and the control module 240 is specifically used to:

[0146] determining a driving condition of the hybrid vehicle according to the operating parameters;

[0147] When the driving condition is of the first intensity, the vehicle torque is preferentially allocated to the motor, and the remaining torque is allocated to the engine; until the motor reaches the base speed point, the allocation slope is determined according to the current torque of the motor, and the current torque of the motor is allocated to the engine according to the allocation slope.

[0148] Furthermore, when the control module 240 is used to control the hybrid vehicle through the control strategy corresponding to the target power dimension in the preset high altitude power mode, the control module 240 is also used to:

[0149] When the driving condition is at the second intensity, or when the driver's instantaneous power increase intention is detected when the driving condition is at the first intensity, the vehicle torque is preferentially allocated to the engine; wherein the second intensity is greater than the first intensity.

[0150] Further, when the target power dimension is the driving mode, the control module 240 is used to control the hybrid vehicle through the control strategy corresponding to the target power dimension in the preset high-altitude power mode, and the control module 240 is specifically used to:

[0151] When the carbon load is greater than the first threshold and less than or equal to the second threshold, and the power of the power battery is greater than the difference between the power battery power conservation threshold and the preset power value, the engine direct drive driving mode is used preferentially;

[0152] When the carbon load is greater than the first threshold and less than or equal to the second threshold, and the power of the power battery is less than or equal to the difference between the power reserve power threshold of the power battery and the preset power value, the series or parallel mode is used;

[0153] When the carbon load is greater than a second threshold value and the power battery power is greater than a preset power threshold value, the engine direct drive driving mode is forced to be used;

[0154] When the carbon load is greater than the second threshold and the power of the power battery is less than or equal to a preset power threshold, the parallel mode is forced to be used.

[0155] Further, when the target power dimension is the speed corresponding to the shift point during the downhill process, the control module 240 is used to control the hybrid vehicle through the control strategy corresponding to the target power dimension in the preset high altitude power mode, and the control module 240 is specifically used to:

[0156] Determining a speed compensation value corresponding to a shift point according to a current altitude of the hybrid vehicle;

[0157] Determining the speed corresponding to the shift point during downhill in a high altitude area according to the sum of the speed compensation value corresponding to the shift point and the original speed corresponding to the shift point;

[0158] When it is detected that the hybrid vehicle triggers the downhill mode in the high altitude area, the gear is switched according to the speed corresponding to the shift point during the downhill process in the high altitude area.

[0159] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 3 As shown in , the electronic device 300 includes a processor 310 , a memory 320 and a bus 330 .

[0160] The memory 320 stores machine-readable instructions executable by the processor 310. When the electronic device 300 is running, the processor 310 communicates with the memory 320 via the bus 330. When the machine-readable instructions are executed by the processor 310, the above-mentioned Figure 1 The steps of the control method of the hybrid electric vehicle in high altitude areas in the method embodiment shown in the figure, and the specific implementation manner can be referred to the method embodiment, which will not be repeated here.

[0161] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the computer program can execute the above-mentioned Figure 1 The steps of the control method of the hybrid electric vehicle in high altitude areas in the method embodiment shown in the figure, and the specific implementation manner can be referred to the method embodiment, which will not be repeated here.

[0162] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0163] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0164] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0165] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0166] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0167] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A control method for a hybrid electric vehicle in a high altitude area, characterized in that: The control method comprises: Obtain the operating parameters of hybrid vehicles in real time; determining, based on the operating parameters, whether a current power output of the hybrid vehicle is insufficient in a high altitude area; If it is determined that the current power output of the hybrid vehicle is insufficient, at least one target power dimension is selected from power dimensions related to the power output of the hybrid vehicle; wherein the power dimensions include: a power battery power conservation threshold, a power battery power distribution method, a vehicle torque distribution method, a driving mode, and a speed corresponding to a shift point during downhill driving; Under each target power dimension, the hybrid vehicle is controlled by a control strategy corresponding to the target power dimension in a preset high-altitude power mode to improve the power output of the hybrid vehicle.

2. The control method according to claim 1, characterized in that: The control method further comprises: Acquiring a navigation destination of the hybrid electric vehicle; When it is determined according to the navigation destination and the operating parameters that the hybrid vehicle meets a preset condition, the hybrid vehicle is controlled to exit the high altitude power mode and preferentially use the pure electric driving mode to travel to the navigation destination; Among them, the operating parameters include: the current carbon load and the current road type; the preset conditions include: the altitude of the navigation destination is lower than a preset threshold, the current carbon load is lower than the carbon load threshold that triggers regeneration, the current road type is a paved road, and the predicted remaining power of the hybrid vehicle when traveling from the current position to the navigation destination in pure electric driving mode is greater than the power battery power conservation threshold in non-high altitude areas.

3. The control method according to claim 1 or 2, characterized in that: When the target power dimension is the power battery power conservation threshold, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a pre-set high altitude power mode includes: Determining a reference value of the power battery power reserve according to the current altitude of the hybrid vehicle; wherein the reference value of the power battery power reserve is positively correlated with the altitude; determining a driving condition of the hybrid vehicle according to the operating parameters; Determining a compensation value of the power battery power conservation amount according to the driving condition and the current altitude; wherein the compensation value of the power battery power conservation amount is positively correlated with the intensity of the driving condition and / or the altitude; The power battery power conservation capacity threshold is determined according to the sum of the reference value and the compensation value of the power battery power conservation capacity.

4. The control method according to claim 3, characterized in that: When the target power dimension is the power battery power distribution mode, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a preset high altitude power mode includes: Limit high-voltage electricity use that is not related to vehicle power output; The power difference between the maximum power of the power battery and the DCDC power is determined, and the power battery thermal management power is determined as a smaller value between the required power and the power difference to ensure the DCDC power.

5. The control method according to claim 1, characterized in that: When the target power dimension is the vehicle torque distribution mode, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a preset high altitude power mode includes: determining a driving condition of the hybrid vehicle according to the operating parameters; When the driving condition is of the first intensity, the vehicle torque is preferentially allocated to the motor, and the remaining torque is allocated to the engine; until the motor reaches the base speed point, the allocation slope is determined according to the current torque of the motor, and the current torque of the motor is allocated to the engine according to the allocation slope.

6. The control method according to claim 5, characterized in that: The controlling of the hybrid vehicle by a control strategy corresponding to the target power dimension in a preset high altitude power mode also includes: When the driving condition is at the second intensity, or when the driver's instantaneous power increase intention is detected when the driving condition is at the first intensity, the vehicle torque is preferentially allocated to the engine; wherein the second intensity is greater than the first intensity.

7. The control method according to claim 1, characterized in that: When the target power dimension is the driving mode, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a preset high altitude power mode includes: When the carbon load is greater than the first threshold and less than or equal to the second threshold, and the power of the power battery is greater than the difference between the power battery power conservation threshold and the preset power value, the engine direct drive driving mode is used preferentially; When the carbon load is greater than the first threshold and less than or equal to the second threshold, and the power of the power battery is less than or equal to the difference between the power reserve power threshold of the power battery and the preset power value, the series or parallel mode is used; When the carbon load is greater than a second threshold value and the power battery power is greater than a preset power threshold value, the engine direct drive driving mode is forced to be used; When the carbon load is greater than the second threshold and the power of the power battery is less than or equal to a preset power threshold, the parallel mode is forced to be used.

8. The control method according to claim 1, characterized in that: When the target power dimension is the speed corresponding to the shift point during the downhill process, controlling the hybrid vehicle by a control strategy corresponding to the target power dimension in a preset high altitude power mode includes: Determining a speed compensation value corresponding to a shift point according to a current altitude of the hybrid vehicle; Determining the speed corresponding to the shift point during downhill in a high altitude area according to the sum of the speed compensation value corresponding to the shift point and the original speed corresponding to the shift point; When it is detected that the hybrid vehicle triggers the downhill mode in the high altitude area, the gear is switched according to the speed corresponding to the shift point during the downhill process in the high altitude area.

9. A control device for a hybrid vehicle in a high altitude area, characterized in that: The control device comprises: An acquisition module, used for acquiring the operating parameters of the hybrid electric vehicle in real time; a determination module, configured to determine whether the current power output of the hybrid vehicle is insufficient in a high altitude area according to the operating parameters; A selection module is configured to select at least one target power dimension from power dimensions related to the power output of the hybrid vehicle if it is determined that the current power output of the hybrid vehicle is insufficient; wherein the power dimensions include: a power battery power conservation threshold, a power battery power distribution method, a vehicle torque distribution method, a driving mode, and a speed corresponding to a shift point during a downhill slope; The control module is used to control the hybrid vehicle under each target power dimension through a control strategy corresponding to the target power dimension in a preset high-altitude power mode to improve the power output of the hybrid vehicle.

10. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method for a high-altitude hybrid vehicle as described in any one of claims 1 to 8.

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