A control method and control device for a hybrid vehicle in a high-altitude region

Abstract

The application provides a control method and control device for a hybrid vehicle in a high-altitude area, comprising: determining whether the current power output is insufficient in the high-altitude area according to the real-time obtained operation parameters of the hybrid vehicle; if it is determined that the current power output is insufficient, selecting at least one target power dimension from the power dimensions related to the power output of the hybrid vehicle; wherein the power dimensions comprise: a power battery power preservation power threshold, a power battery power distribution mode, a vehicle torque distribution mode, a driving mode and a speed corresponding to a shift point in a downhill process; under each target power dimension, the hybrid vehicle is controlled by a control strategy corresponding to the target power dimension in the pre-set power mode in the high-altitude area, so as to improve the power output of the hybrid vehicle. In this way, the control strategy optimization can be performed for the insufficient power of the hybrid vehicle in the high-altitude area, and the problem of insufficient vehicle power caused by the limited engine power can be solved.

Description

TECHNICAL FIELD

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

[0002] In high-altitude areas, especially above 3500 meters, due to the thin air, the engine intake is insufficient, the fuel combustion is insufficient, and the power output is weakened. When climbing or getting unstuck on unpaved roads, the power is obviously insufficient, and at the same time, the engine carbon load (i.e. carbon deposition) increases, which easily triggers the regeneration mechanism, further affecting the power output and driving experience of the vehicle.

[0003] For a hybrid vehicle, although there is motor assistance, when climbing for a long time or getting unstuck, the power battery power will quickly decrease, so that the power of the whole vehicle can only be maintained at a good level for a short time, and then only rely on the hybrid engine to maintain the high power of the whole vehicle, so the power of the engine is also limited and cannot meet the power demand of the driver, which even affects the safety of the whole vehicle and driving. SUMMARY

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

[0005] The embodiment of the present application provides a control method for a hybrid vehicle in high-altitude areas, which comprises:

[0006] real-time acquisition of the running parameters of the hybrid vehicle;

[0007] determining whether the current power output of the hybrid vehicle in the high-altitude area is insufficient according to the running parameters;

[0008] if it is determined that the current power output of the hybrid vehicle is insufficient, selecting at least one target power dimension from the power dimensions related to the power output of the hybrid vehicle; wherein the power dimensions include: power battery power saving power threshold, power battery power distribution mode, whole vehicle torque distribution mode, driving mode and speed corresponding to the shift point in the downhill process;

[0009] under each target power dimension, controlling the hybrid vehicle through the control strategy corresponding to the target power dimension in the pre-set high-altitude area power mode to improve the power output of the hybrid vehicle.

[0010] Further, the control method further comprises:

[0011] obtaining a navigation destination of the hybrid vehicle;

[0012] when it is determined that the hybrid vehicle meets a preset condition according to the navigation destination and the operation parameter, controlling the hybrid vehicle to exit the high-altitude area power mode and preferentially use a pure electric driving mode to travel to the navigation destination;

[0013] The operation parameter includes a current carbon load and a current road surface type, and the preset condition includes that the altitude of the navigation destination is lower than a preset threshold, the current carbon load is lower than a carbon load threshold triggering regeneration, the current road surface type is a paved road surface, and a predicted remaining electric quantity of the hybrid vehicle when traveling from a current position to the navigation destination in the pure electric driving mode is greater than a power battery power preservation electric quantity threshold in a non-high-altitude area.

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

[0015] determining a reference value of the power battery power preservation electric quantity according to a current altitude of the hybrid vehicle; wherein the reference value of the power battery power preservation electric quantity and the altitude are positively correlated;

[0016] determining a driving condition of the hybrid vehicle according to the operation parameter;

[0017] determining a compensation value of the power battery power preservation electric quantity according to the driving condition and the current altitude; wherein the compensation value of the power battery power preservation electric quantity and the intensity of the driving condition and / or the altitude are positively correlated;

[0018] determining the power battery power preservation electric quantity threshold according to a sum of the reference value and the compensation value of the power battery power preservation electric quantity.

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

[0020] limiting high-voltage power consumption irrelevant to vehicle power output;

[0021] determining a power difference between a maximum power of the power battery and a DCDC power, and determining a power of power battery thermal management as a smaller value between a demand power and the power difference, to ensure the DCDC power.

[0022] Further, when the target power dimension is the whole vehicle torque distribution mode, the hybrid electric vehicle is controlled by the control strategy corresponding to the target power dimension in the high-altitude region power mode pre-set, comprising:

[0023] determining the driving condition of the hybrid electric vehicle according to the operating parameter;

[0024] when the driving condition is a first intense degree, the whole vehicle torque is preferentially distributed to the motor, and the remaining torque is distributed to the engine; until the motor reaches the base speed point, the distribution slope is determined according to the current torque of the motor, and the current torque of the motor is distributed to the engine according to the distribution slope.

[0025] Further, the hybrid electric vehicle is controlled by the control strategy corresponding to the target power dimension in the high-altitude region power mode pre-set, further comprising:

[0026] when the driving condition is a second intense degree, or when the driving condition is the first intense degree and the instantaneous power increasing intention of the driver is detected, the whole vehicle torque is preferentially distributed to the engine; wherein the second intense degree is greater than the first intense degree.

[0027] Further, when the target power dimension is the driving mode, the hybrid electric vehicle is controlled by the control strategy corresponding to the target power dimension in the high-altitude region power mode pre-set, comprising:

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

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

[0030] 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;

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

[0032] Further, when the target power dimension is the speed corresponding to the shift point in the downhill process, the hybrid electric vehicle is controlled by the control strategy corresponding to the target power dimension in the high-altitude region power mode pre-set, comprising:

[0033] According to the current altitude of the hybrid vehicle, a shift point corresponding speed compensation value is determined;

[0034] According to the sum of the shift point corresponding speed compensation value and an original shift point corresponding speed, a shift point corresponding speed in a high altitude downhill process is determined.

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

[0036] The embodiment of the application further provides a control device of a hybrid vehicle in a high altitude area, and the control device comprises:

[0037] An acquisition module is configured to acquire running parameters of the hybrid vehicle in real time.

[0038] A determination module is configured to determine whether the current power output of the hybrid vehicle in a high altitude area is insufficient according to the running 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 comprise a power battery power saving power threshold, a power battery power distribution mode, a vehicle torque distribution mode, a driving mode and a shift point corresponding speed in a downhill process.

[0040] A control module is configured to control the hybrid vehicle by using a control strategy corresponding to each target power dimension in a high altitude power mode pre-set for the target power dimension, so as to improve the power output of the hybrid vehicle.

[0041] The embodiment of the application further provides an electronic device, which comprises a processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, the processor and the memory communicate through the bus when the electronic device is running, and the machine readable instructions are executed by the processor to perform the steps of the control method of the hybrid vehicle in a high altitude area.

[0042] The embodiment of the application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by the processor to perform the steps of the control method of the hybrid vehicle in a high altitude area.

[0043] The control method and control device for a hybrid electric vehicle in a high-altitude area provided by the embodiment of the present application can improve the power of the hybrid electric vehicle from at least one power dimension when it is determined that the current power output of the hybrid electric vehicle in the high-altitude area is insufficient, the power dimension including a power battery power reserve power threshold, a power battery power distribution mode, a vehicle torque distribution mode, a driving mode and a speed corresponding to a gear shift point in a downhill process. In this way, the control strategy optimization can be performed in multiple ways for the power deficiency of the hybrid electric vehicle in the high-altitude area, which is suitable for different driving scenarios, fully compensates for the problem of insufficient vehicle power caused by the limited engine power, and improves the vehicle safety and driving experience.

[0044] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

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

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

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

[0049] In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein 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 claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, every other embodiment obtained by those skilled in the art without creative labor belongs to the scope of the present application.

[0050] It is found through research that in plateau areas, especially above an altitude of 3500 meters, due to the thin air, the engine intake is insufficient, the fuel combustion is insufficient, and the power output is weakened. When climbing or getting unstuck on unpaved roads, the power is obviously insufficient, and at the same time, the engine carbon load (i.e. carbon deposit) increases, which easily triggers the regeneration mechanism, further affecting the power output of the vehicle and the driving experience.

[0051] For a hybrid vehicle, although there is motor assistance, when climbing for a long time or getting unstuck, the power battery power will quickly decrease, so that the power of the whole vehicle can only be maintained at a good level for a short time, and then only the hybrid engine can be relied on to maintain the high power of the whole vehicle, so the power of the engine is also limited and cannot meet the power demand of the driver, and even affects the safety of the whole vehicle and driving.

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

[0053] It should be noted that as the altitude increases, the insufficient intake of the engine affects the fuel combustion efficiency, and thus the power output of the engine. Therefore, the high-altitude area in the embodiment of the application mainly refers to above an altitude of 3500m. The altitude of the vehicle can be determined by the GPS positioning signal sent by the BCM or converted from the atmospheric pressure signal of the engine. When it is determined that the hybrid vehicle is in a high-altitude area according to the altitude, the control method for the hybrid vehicle in a high-altitude area in the embodiment of the application can be executed. Specifically, the controller in the vehicle, such as the hybrid control unit HCU, can execute it.

[0054] Please refer to Figure 1 , Figure 1 The flowchart of the control method for a hybrid vehicle in a high-altitude area provided by the embodiment of the application. As Figure 1 indicated in the embodiment of the application, the control method provided by the embodiment of the application comprises:

[0055] S101, acquiring the running parameters of the hybrid vehicle in real time.

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

[0057] S102, determining whether the current power output of the hybrid vehicle in the high-altitude area is insufficient according to the running parameters.

[0058] In this step, first, the current driving condition of the hybrid vehicle in the high-altitude area can be determined according to the operating parameters, and it is judged whether the current driving condition belongs to a preset specific driving condition. Exemplarily, the specific driving condition can include a whole vehicle continuous escape condition, a climbing start condition, etc. At this time, the operating parameters can include the throttle opening, the vehicle speed, the tire state, etc. Specifically, if it is detected that the throttle opening is greater than a preset opening threshold, and the vehicle speed is less than a preset vehicle speed threshold; or, the vehicle speed is less than the preset vehicle speed threshold within a predetermined time period after the throttle is stepped on (there is a certain throttle opening); or, the condition of detecting that the wheels appear to be slipping lasts more than a preset time period; it can be judged that the current driving condition belongs to the preset specific driving condition.

[0059] Then, it can be judged whether the current power output is insufficient according to the specific driving condition; for example, if the specific driving condition is identified multiple times within a predetermined time window, more than 5 times within 60s, and the current SOC decreases by more than 10% in this stage, it can be judged that the current power output is insufficient.

[0060] In addition, if the carbon load (carbon deposition) increases, it may trigger frequent regeneration of the hybrid vehicle, affecting the driving experience, so the current power output of the hybrid vehicle can also be determined to be insufficient according to whether the carbon load exceeds a preset threshold.

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

[0062] Among them, the power dimensions include: power battery power saving power threshold, power battery power distribution mode, whole vehicle torque distribution mode, driving mode and speed corresponding to shift point in downhill process.

[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 therefrom, so that the power shortage can be controlled and optimized from multiple dimensions, which is suitable for different vehicle models, different driving scenes, and meets more diverse power improvement needs. Further, the target power dimension can also be selected according to the degree of power output shortage, that is, a larger number of target power dimensions are selected when the power output is severely insufficient, so as to achieve 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 the pre-set high-altitude area power mode, so as to improve the power output of the hybrid vehicle.

[0065] Here, the control method provided by the embodiment of the application is provided with a high-altitude region power mode, and when it is determined that the hybrid vehicle is in a high-altitude region, the high-altitude region power mode is activated. The high-altitude region 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, so that the effect of improving the power output can be achieved.

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

[0067] In the first possible implementation, when the target power dimension is the power battery power preservation threshold, the control of the hybrid vehicle in step S104 through the control strategy corresponding to the target power dimension in the pre-set high-altitude region power mode can include:

[0068] Step a1, determining a reference value of the power battery power preservation amount according to the current altitude of the hybrid vehicle.

[0069] The reference value of the power battery power preservation amount and the altitude are positively correlated.

[0070] Since the engine performance becomes weaker with the increase of the altitude, in order to ensure the continuous power output of the vehicle during driving, a certain amount of power value can be added to the original strategy power preservation threshold as a reference value to ensure the power performance of the driver driving the vehicle in the high-altitude region, such as getting out of trouble and climbing. For example, the relationship between the altitude and the reference value of the power battery power preservation amount can refer to Table 1 below.

[0071] Table 1: Corresponding relationship table of altitude and reference value of power battery power preservation amount

[0072]

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

[0074] In specific implementation, if the driver sets the power battery power preservation threshold to be less than the reference value corresponding to different altitudes through the instrument, etc., the driver can be prompted in words to “please set the power battery power preservation threshold to be not less than xx due to high altitude”, so as to prevent the driver's setting from changing the power battery power preservation threshold in the high-altitude mode.

[0075] Step a2: Determine the driving conditions of the hybrid vehicle based on the operating parameters.

[0076] For example, if the driver's throttle opening is greater than 90% and the vehicle speed is less than 5 km / h, or if wheel slippage is detected for more than 10,000 ms, and if this is detected more than 5 times within 60 seconds, and the current SOC decreases by more than 10% during this period, then it is determined that a specific intense driving condition has occurred, and further compensation of the power battery's charge level is required.

[0077] Step a3: Determine the compensation value of the power battery's charge reserve based on the driving conditions and the current altitude.

[0078] Step a4: Determine the power battery power reserve threshold based on the sum of the baseline value and the compensation value of the power battery power reserve capacity.

[0079] The compensation value for the power battery's reserve charge is positively correlated with the intensity of the driving condition and / or altitude. That is, the more intense the driving condition (i.e., the more severe the power shortage) and / or the higher the current altitude, the greater the compensation value, and consequently, the higher the sum of the baseline and compensation values ​​for the power battery's reserve charge, i.e., the power battery's reserve charge threshold. The intensity of the driving condition can be determined by analyzing the values ​​of the operating parameters of that condition. For example, the relationship between altitude and the compensation value for the power battery's reserve charge can be seen in Table 2 below.

[0080] Table 2. Correspondence between altitude and compensation value of power battery charge.

[0081]

[0082] The aggressive driving condition recognition in this embodiment is mainly based on the needs of the current driving condition. When the road conditions are poor and the power output is insufficient, the maximum power battery charge threshold based on altitude compensation is saved to RAM to ensure sufficient power to cope with emergencies. If this aggressive driving condition is not triggered within several consecutive driving cycles, the compensation value of the power battery charge is cleared, and the baseline value of the power battery charge is determined as the power battery charge threshold.

[0083] In a second possible implementation, when the target power dimension is the power distribution mode of the power battery, step S104, which controls the hybrid vehicle using a control strategy corresponding to the target power dimension in a pre-set high-altitude region power mode, may include:

[0084] Step b1, limit high-voltage power consumption irrelevant to the whole vehicle power output.

[0085] Exemplarily, the high-voltage power consumption irrelevant to the whole vehicle power output can include refrigeration or heating power of 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 of the power battery thermal management as the smaller value between the demand power and the power difference, to ensure the DCDC power.

[0087] In this step, since the DCDC mainly supplies power to the low-voltage, if the power is limited, it will affect the power supply of all controllers of the whole vehicle, therefore, the DCDC power is not limited, and the DCDC power is ensured. Specifically, the minimum value of the demand power and (the maximum discharging power of the power battery-DCDC power) can be taken, and the power of the thermal management of the power battery is output. In this way, unnecessary high-voltage power consumption can be limited, and the power of the power output is ensured.

[0088] In a third possible implementation, when the target power dimension is the whole vehicle torque distribution mode, the step S104 of controlling the hybrid electric vehicle by the control strategy corresponding to the target power dimension in the high-altitude region power mode pre-set can include:

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

[0090] Exemplarily, when the accelerator is greater than 90%, the current vehicle speed is lower than 3km / h or the vehicle speed is continuously lower than 5km / h within 3s 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 the whole vehicle continuous escape and climbing start condition, which indicates that the power output of the whole vehicle is insufficient at high altitude, the driving condition is the first intense degree, and the strategy of improving the power performance of the whole vehicle is needed.

[0091] Step c2, when the driving condition is the first intense degree, the whole vehicle torque is preferentially distributed to the motor, and the remaining torque is distributed to the engine; until the motor reaches the base speed point, the distribution slope is determined according to the current torque of the motor, and the current torque of the motor is distributed to the engine according to the distribution slope.

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

[0093] Therefore, in the first driving condition, the driver's sustained power output of the large throttle, the engine carbon load is more likely to increase, and if the engine torque distribution is reduced, the engine carbon load output is lower at this time. To prevent the risk of engine failure and vehicle unable to drive during subsequent driving due to the increase of carbon load, therefore, in combination with the motor torque response characteristics, when the detection of the power battery is greater than 20%, the vehicle torque distribution is prioritized to 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 according to the current motor torque, or the specific torque distribution is distributed according to the original distribution strategy without activating the high-altitude power mode. At this time, it can ensure that the driver's torque demand is quickly responded.

[0094] Table 3 Corresponding relationship table of current motor torque and distribution slope

[0095]

[0096] Further, the control strategy corresponding to the target power dimension in the high-altitude power mode in step S104 of the hybrid vehicle controlled by the pre-set control strategy can also include:

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

[0098] In specific implementation, if the driver has an instantaneous power boost intention in the first driving condition, or if the driving condition is detected to be the second intensity which is more intense; the current motor priority torque distribution strategy is cancelled, and the vehicle torque is preferentially distributed to the engine.

[0099] Wherein, the instantaneous power boost intention can be a launch intention, and the driver can trigger it by simultaneously pressing the brake and the throttle, or pressing the pre-set button on the vehicle, etc. Because the throttle and the brake are pressed at the same time, if the vehicle demand torque is preferentially distributed to the motor, the motor is more likely to generate heat, stall, etc., which can easily cause damage to high-voltage electrical components or reduce durability. Therefore, the torque is preferentially distributed to the engine, although the response is slow, but the engine response torque time fully meets the driver's power demand during the preparation of the launch, which can improve the power output and ensure the safety of the vehicle.

[0100] Wherein, the intensity of the driving condition can be determined according to the operating parameters. Corresponding to the example in step c1, when the accelerator is greater than 90%, the vehicle speed is kept at 0 km / h, and the condition lasts for 10 seconds, it indicates that a serious situation of getting stuck in the car is encountered, the vehicle speed is always 0, the driver almost needs full throttle, and the power output is seriously insufficient, so the intensity of the driving condition is further upgraded to the second intensity, at this time, long-time maintenance of this condition causes adverse effects on the heat production and locked-rotor of the motor, and cannot well maintain the torque demand of the driver, and is easy to cause the loss of parts. At this time, the vehicle torque can also be preferentially allocated to the engine.

[0101] In a fourth possible implementation, when the target power dimension is the driving mode, the control of the hybrid electric vehicle in step S104 by the control strategy corresponding to the target power dimension in the high-altitude region power mode pre-set can include:

[0102] Step d1, when the carbon load is greater than the first threshold value and less than or equal to the second threshold value, and the power battery power is greater than the difference between the power battery power preservation threshold value and the 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 value and less than or equal to the second threshold value, and the power battery power is less than or equal to the difference between the power battery power preservation threshold value and the preset power value, the series or parallel mode is used;

[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 value, and the power battery power is less than or equal to the preset power threshold value, the parallel mode is forced to be used.

[0106] It should be noted that the existing hybrid driving mode does not consider the working condition of insufficient power of the engine at high altitude and more easily increasing the generation of carbon load, more easily triggering the regenerative strategy, and even limiting the engine torque after the carbon load increases greatly, affecting the normal driving of the vehicle. The hybrid driving mode in the high-altitude region power mode is adjusted in the embodiment of the application, the operating power and speed of the engine are increased, the temperature of the engine aftertreatment is increased in time, the opportunity of engine regeneration to reduce carbon load is increased.

[0107] For example, when the carbon load is less than or equal to the first threshold value (for example, 15g), the carbon load is not very large, based on the current driving mode, the engine does not enter the torque limiting or fault mode, and no special treatment is needed.

[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 preservation threshold - a preset power value (for example, 10%), the engine direct drive mode has the highest priority, unless the driver forces the use of pure electric or other modes. If the power battery SOC is less than or equal to the power battery power preservation threshold - a preset power value (for example, 10%), the series mode is used for power generation for the double-motor coupler, which can both charge the power battery to ensure sufficient power battery SOC and increase the engine operating speed to improve engine 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 vehicle models and actual engine capacity, until the power battery SOC is greater than the power preservation threshold. For the P2 hybrid system, the parallel mode can be used for power generation, and part of the engine power is used for vehicle driving and part of the engine power 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 vehicle models and actual engine capacity. For example, the relationship between power generation power and altitude and engine power can refer to Table 4 below.

[0109] Table 4 Corresponding relationship table of power generation power, 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, and even if the driver switches the driving mode, it will not be switched, and the driver is prompted that "engine regeneration, temporarily unable to switch driving mode".

[0112] When the power battery SOC is less than the preset power threshold, the parallel mode is forced to be used, and even if the driver switches the driving mode, it will not be switched, and the driver is prompted that "engine regeneration, temporarily unable to switch driving mode". In this way, part of the engine power meets the vehicle driving, and the other part of the engine power drives the generator to charge. Further, the control method further includes: when the driver demand power is less than a certain proportion of the engine optimal power (for example, 0.7 times the engine optimal power), the engine operates according to the current power; when the driver demand power is greater than 0.7 times the engine optimal power, the engine operates at the current driver demand power point + 7kw as the working power of the engine, wherein 7kw is the power generation power of the engine, but the working power of the engine cannot be higher than the maximum power point of the engine. The purpose is to prevent the carbon load from continuously increasing and the engine working temperature from continuously rising after the engine works, 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 in the downhill process, the step S104 of controlling the hybrid vehicle by the control strategy corresponding to the target power dimension in the high-altitude region power mode pre-set in the step S103 can include:

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

[0115] Step e2, determining a shift point corresponding speed in a high-altitude region downhill process according to the sum of the shift point corresponding speed compensation value and the original shift point corresponding speed.

[0116] Step e3, when it is detected that the hybrid vehicle triggers the downhill mode in the high-altitude region, performing gear shifting according to the shift point corresponding speed in the high-altitude region downhill process.

[0117] It is found through research that because the air in the plateau region is thin, the fuel combustion is insufficient, which easily causes the increase of the engine carbon load, and further triggers the engine torque limiting. At this time, if the vehicle is in the driving working condition of climbing or getting out of trouble, the carbon load is more likely to increase under the driving condition of large throttle. According to the actual test, sometimes the engine regeneration cannot maintain a low carbon load under the above working condition, and the carbon load may continue to increase. In order to further solve the problem of the increase of the carbon load, the embodiments of the present application also consider optimizing the shift point.

[0118] Specifically, after the hybrid vehicle triggers the downhill mode in the high-altitude region, the shift point is as high as possible, so that the transmission is kept in the low gear as much as possible. This is because the speed under the low gear is large, the engine speed is relatively high under the same vehicle speed, and the carbon load is small under the working condition of engine dragging without stepping on the throttle. Therefore, this strategy optimization can avoid the problem that the engine dragging force is small when the vehicle is in the high gear, the vehicle speed may become faster, the engine fuel injection amount is small at this time, and the engine cannot regenerate in time to reduce the carbon load. According to the control strategy provided by the embodiments of the present application for shift point optimization, the engine can be kept in the low gear and maintained at a high speed, and even if the engine is regenerating at this time, the driving regeneration effect of the engine will be better.

[0119] In specific implementation, the shift point corresponding speed compensation value can be determined by a similar table lookup method according to the current altitude of the hybrid vehicle, and the sum of the speed compensation value and the original shift point corresponding speed is determined as the shift point corresponding speed in the high-altitude region downhill process, so as to improve the shift point.

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

[0121] Further, the control method in the embodiments of the present application further comprises:

[0122] S105, obtaining a navigation destination of the hybrid vehicle.

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

[0124] S106, when it is determined that the hybrid vehicle meets the preset condition according to the navigation destination and the running parameter, the hybrid vehicle is controlled to exit the high-altitude area power mode and preferentially use the pure electric driving mode to travel to the navigation destination.

[0125] The running parameter includes: current carbon load and current road surface type; the preset condition includes: the altitude of the navigation destination is lower than a preset threshold, the current carbon load is lower than a carbon load threshold triggering regeneration, the current road surface type is paved road surface, and the predicted remaining power of the hybrid vehicle when traveling from the current position to the navigation destination in the pure electric driving mode is greater than the power preservation power threshold of the power battery in the non-high-altitude area.

[0126] Here, if the distance to the navigation destination is driven in pure electric mode, the remaining power preservation power target value (about 25%) in the non-high-altitude mode can be left after reaching the destination, the altitude of the destination is lower than 3500m, the current carbon load has not reached the limit value triggering regeneration, and the current road surface type is determined to be paved road surface according to the navigation, and the above conditions are met for a certain time (for example, 5s), the high-altitude area power mode can be exited, and the normal driving mode is restored, and the pure electric mode is used as much as possible. The vehicle demand torque obtained according to the current driver throttle opening, and the power preservation 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 does not continue to generate in the current high-altitude driving scenario, the influence of the fuel consumption caused by the thin air in the high-altitude area is reduced, and the fuel economy is ensured.

[0127] The control method for the hybrid electric vehicle in the high-altitude area provided by the embodiment of the present application can improve the power of the hybrid electric vehicle from at least one power dimension when it is determined that the current power output of the hybrid electric vehicle in the high-altitude area is insufficient, and the power dimension includes the power battery power reserve threshold, the power battery power distribution mode, the vehicle torque distribution mode, the driving mode and the speed corresponding to the shift point in the downhill process. In this way, the control strategy optimization can be performed on the insufficient power of the hybrid electric vehicle in the high-altitude area through various ways, which is suitable for different driving scenarios, fully compensates for the problem of insufficient vehicle power caused by the limited engine power, and improves the vehicle safety and driving experience.

[0128] Please refer to Figure 2 , Figure 2 The structure diagram of the control device for the hybrid electric vehicle in the high-altitude area provided by the embodiment of the present application is shown in FIG. 2. Figure 2 As shown in FIG. 2, the control device 200 includes:

[0129] The acquisition module 210 is configured to acquire the running parameters of the hybrid electric vehicle in real time.

[0130] The determination module 220 is configured to determine whether the current power output of the hybrid electric vehicle in the high-altitude area is insufficient according to the running parameters.

[0131] The selection module 230 is configured to select at least one target power dimension from the power dimensions related to the power output of the hybrid electric vehicle if it is determined that the current power output of the hybrid electric vehicle is insufficient, and the power dimensions include the power battery power reserve threshold, the power battery power distribution mode, the vehicle torque distribution mode, the driving mode and the speed corresponding to the shift point in the downhill process.

[0132] The control module 240 is configured to control the hybrid electric vehicle through the control strategy corresponding to the target power dimension in the pre-set high-altitude area power mode under each target power dimension, so as to improve the power output of the hybrid electric vehicle.

[0133] Further, the control module 240 is further configured to:

[0134] Acquire the navigation destination of the hybrid electric vehicle.

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

[0136] The operation parameter includes: current carbon load and current road type; the preset condition includes: altitude of the navigation destination is lower than a preset threshold, current carbon load is lower than a carbon load threshold triggering regeneration, current road type is paved road, and predicted remaining power when the hybrid vehicle travels from the current position to the navigation destination in the pure electric driving mode is greater than a power battery power preservation threshold in a non-high altitude area.

[0137] Further, when the target power dimension is the power battery power preservation threshold, the control module 240 is specifically configured to, when the hybrid vehicle is controlled by a control strategy corresponding to the target power dimension in the high altitude area power mode preset in advance:

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

[0139] determine a driving condition of the hybrid vehicle according to the operation parameter;

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

[0141] determine the power battery power preservation threshold according to a sum of the reference value and the compensation value of the power battery power preservation.

[0142] Further, when the target power dimension is the power battery power distribution mode, the control module 240 is specifically configured to, when the hybrid vehicle is controlled by a control strategy corresponding to the target power dimension in the high altitude area power mode preset in advance:

[0143] limit high-voltage power consumption irrelevant to vehicle power output;

[0144] determine a power difference between the maximum power of the power battery and the DCDC power, and determine the power battery thermal management power 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 specifically configured to, when the hybrid vehicle is controlled by a control strategy corresponding to the target power dimension in the high altitude area power mode preset in advance:

[0146] determine a driving condition of the hybrid vehicle according to the operating parameter;

[0147] when the driving condition is a first intensity, preferentially allocating a vehicle torque to the motor, and allocating a remaining torque to the engine; until the motor reaches a base speed point, determining a distribution slope according to a current torque of the motor, and allocating the current torque of the motor to the engine according to the distribution slope.

[0148] Further, when the control module 240 is used to control the hybrid vehicle by a control strategy corresponding to the target power dimension in a pre-set high-altitude region power mode, the control module 240 is further used to:

[0149] when the driving condition is a second intensity, or when the driving condition is the first intensity and an instantaneous power increasing intention of the driver is detected, preferentially allocating the vehicle torque 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 by a control strategy corresponding to the target power dimension in a pre-set high-altitude region power mode, and the control module 240 is specifically used to:

[0151] when the carbon load is greater than a first threshold value and less than or equal to a second threshold value, and the power battery power is greater than a difference between the power battery power preservation threshold value and a pre-set power value, preferentially using the engine direct drive driving mode;

[0152] when the carbon load is greater than the first threshold value and less than or equal to the second threshold value, and the power battery power is less than or equal to the difference between the power battery power preservation threshold value and the pre-set power value, using the series or parallel mode;

[0153] when the carbon load is greater than the second threshold value, and the power battery power is greater than a pre-set power threshold value, forcibly using the engine direct drive driving mode;

[0154] when the carbon load is greater than the second threshold value, and the power battery power is less than or equal to the pre-set power threshold value, forcibly using the parallel mode.

[0155] Further, when the target power dimension is a shift point corresponding speed in the downhill process, the control module 240 is used to control the hybrid vehicle by a control strategy corresponding to the target power dimension in a pre-set high-altitude region power mode, and the control module 240 is specifically used to:

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

[0157] determining the shift point corresponding speed in the high-altitude downhill process according to the sum of the shift point corresponding speed compensation value and the original shift point corresponding speed;

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

[0159] Referring to Figure 3 , Figure 3 is a structural schematic diagram of an electronic device provided by an embodiment of the present application. As shown in Figure 3 , 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 and the memory 320 communicate through the bus 330. When the machine readable instructions are executed by the processor 310, the steps of the control method of the high-altitude hybrid vehicle in the method embodiment shown in Figure 1 may be performed. The specific implementation can be referred to the method embodiment, which will not be described here.

[0161] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program. When the computer program is run by a processor, the steps of the control method of the high-altitude hybrid vehicle in the method embodiment shown in Figure 1 may be performed. The specific implementation can be referred to the method embodiment, which will not be described here.

[0162] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be described here.

[0163] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented by other ways. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there can be another division in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interfaces, devices or units, and can be electrical, mechanical or other forms.

[0164] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

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

[0166] If the functions are realized 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 executable by a processor. Based on this understanding, the technical solutions of the present application or the part of the present application that essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

[0167] Finally, it should be noted that: the above-described embodiments are only specific embodiments of the present application, used to illustrate the technical solutions of the present application, and not to limit them. The protection scope of the present application is not limited thereto, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any skilled person familiar with the technical field can modify or easily think of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present application, or make equivalent replacements to some technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A control method for a hybrid electric vehicle in high-altitude areas, characterized in that, The control method includes: Real-time acquisition of operating parameters of hybrid vehicles; Determine whether the current power output of the hybrid vehicle is insufficient in high-altitude areas based on the operating parameters. If it is determined that the current power output of the hybrid vehicle is insufficient, then at least one target power dimension is selected from the power dimensions related to the power output of the hybrid vehicle; wherein, the power dimensions include: power battery charge threshold, power battery power distribution method, vehicle torque distribution method, driving mode, and the speed corresponding to the shift point during downhill driving. Under each target power dimension, the hybrid vehicle is controlled by a control strategy corresponding to that target power dimension in a pre-set high-altitude region power mode, so as to improve the power output of the hybrid vehicle. The control method further includes: Obtain the navigation destination of the hybrid vehicle; When the hybrid vehicle meets the preset conditions based on the navigation destination and the operating parameters, the hybrid vehicle is controlled to exit the high-altitude power mode and use the pure electric driving mode to drive towards the navigation destination. The operating parameters include: current carbon load and current road surface 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 for triggering regeneration, the current road surface type is paved road, and the predicted remaining power of the hybrid vehicle when it travels from the current location to the navigation destination in pure electric driving mode is greater than the power battery power reserve threshold for non-high altitude areas.

2. The control method according to claim 1, characterized in that, When the target power dimension is equal to the battery charge retention threshold, controlling the hybrid vehicle using a control strategy corresponding to the target power dimension in a pre-set high-altitude region power mode includes: Based on the current altitude of the hybrid vehicle, a baseline value for the reserve capacity of the power battery is determined; wherein, the baseline value for the reserve capacity of the power battery is positively correlated with the altitude; The driving conditions of the hybrid vehicle are determined based on the operating parameters. Based on the driving conditions and the current altitude, a compensation value for the power battery's reserve charge is determined; wherein, the compensation value for the power battery's reserve charge is positively correlated with the intensity of the driving conditions and / or the altitude. The power battery power reserve threshold is determined based on the sum of the baseline value and the compensation value of the power battery power reserve capacity.

3. The control method according to claim 2, characterized in that, When the target power dimension is the power distribution mode of the power battery, controlling the hybrid vehicle through the control strategy corresponding to the target power dimension in the pre-set high-altitude region power mode includes: Restrict high-voltage electricity use that is unrelated to the vehicle's power output; Determine the power difference between the maximum power of the power battery and the power of the DC-DC converter, and determine the thermal management power of the power battery as the smaller value between the required power and the power difference to ensure the DC-DC power.

4. 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 through the control strategy corresponding to the target power dimension in the pre-set high-altitude region power mode includes: The driving conditions of the hybrid vehicle are determined based on the operating parameters. When the driving condition is at the first level of intensity, the total torque of the vehicle is preferentially distributed to the motor, and the remaining torque is distributed to the engine. After the motor reaches the base speed point, the distribution slope is determined according to the current torque of the motor, and the current torque of the motor is distributed to the engine according to the distribution slope.

5. The control method according to claim 4, characterized in that, The method of controlling the hybrid vehicle through a control strategy corresponding to the target power dimension in a pre-set high-altitude region power mode further includes: When the driving condition is at the second level of intensity, or when the driver's instantaneous intention to increase power is detected when the driving condition is at the first level of intensity, the vehicle torque is preferentially distributed to the engine; wherein the second level of intensity is greater than the first level of intensity.

6. The control method according to claim 1, characterized in that, When the target power dimension is the driving mode, controlling the hybrid vehicle using a control strategy corresponding to the target power dimension in a pre-set high-altitude region 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 battery charge is greater than the difference between the power battery charge retention threshold and the preset charge value, the engine direct drive driving mode is used first. When the carbon load is greater than the first threshold and less than or equal to the second threshold, and the power battery capacity is less than or equal to the difference between the power battery capacity retention threshold and the preset capacity value, a series or parallel connection mode is used. When the carbon load is greater than the second threshold and the power battery charge is greater than the preset charge threshold, the engine direct drive driving mode is forcibly used. When the carbon load is greater than the second threshold and the power battery charge is less than or equal to the preset charge threshold, the parallel mode is forcibly used.

7. The control method according to claim 1, characterized in that, When the target power dimension is the speed corresponding to the gear shift point during the downhill process, controlling the hybrid vehicle through the control strategy corresponding to the target power dimension in the pre-set high-altitude region power mode includes: Determine the speed compensation value corresponding to the shift point based on the current altitude of the hybrid vehicle; Based on the sum of the speed compensation value corresponding to the shift point and the original speed corresponding to the shift point, the speed corresponding to the shift point during downhill driving in high-altitude areas is determined. When the hybrid vehicle is detected to have triggered downhill mode in a 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.

8. A control device for a hybrid electric vehicle operating in high-altitude areas, characterized in that, The control device includes: The acquisition module is used to acquire the operating parameters of hybrid vehicles in real time. The determination module is used to determine whether the current power output of the hybrid vehicle is insufficient in high-altitude areas based on the operating parameters. The selection module is used to select at least one target power dimension from the 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: power battery charge threshold, power battery power distribution method, vehicle torque distribution method, driving mode and the speed corresponding to the shift point during downhill driving. The control module is used to control the hybrid vehicle under each target power dimension by means of a control strategy corresponding to the target power dimension in the high-altitude region power mode, so as to improve the power output of the hybrid vehicle. The control module is also used for: Obtain the navigation destination of the hybrid vehicle; When the hybrid vehicle meets the preset conditions based on the navigation destination and the operating parameters, the hybrid vehicle is controlled to exit the high-altitude power mode and use the pure electric driving mode to drive towards the navigation destination. The operating parameters include: current carbon load and current road surface 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 for triggering regeneration, the current road surface type is paved road, and the predicted remaining power of the hybrid vehicle when it travels from the current location to the navigation destination in pure electric driving mode is greater than the power battery power reserve threshold for non-high altitude areas.

9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. The machine-readable instructions are executed by the processor to perform the steps of the control method for a hybrid electric vehicle in high-altitude areas as described in any one of claims 1 to 7.

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