Vehicle working condition identification method and working condition identification device

Abstract

The invention provides a vehicle working condition recognition method and device, and the method comprises the steps: obtaining a plurality of feature parameters in a preset calculation period; for each characteristic parameter, determining a working condition corresponding to at least one characteristic parameter interval in which the characteristic parameter falls, and outputting a sub-score of the characteristic parameter under the working condition; for each working condition, according to the sub-scores of all the characteristic parameters under the working condition, the characteristic parameter score of the working condition of the vehicle in the preset calculation period is determined; and according to the characteristic parameter score, determining a target working condition of the vehicle in the preset calculation period and an engine start-stop strategy. According to the application, the target working condition of the vehicle is determined, and the corresponding engine start-stop strategy is determined according to the target working condition of the vehicle, so that the wear and failure rate of the engine are reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle operating condition identification method and an operating condition identification device. Background Art

[0002] At present, hybrid vehicles need to start the engine to charge the vehicle when the battery is low or the power consumption is high due to the SOC (State of Charge) power conservation requirement. The rules for hybrid vehicles' engine start-stop SOC conditions and the power generation after the engine is started are fixed.

[0003] However, fixed rules make it difficult to ensure that hybrid vehicles operate at optimal start-stop points and optimal power generation under all operating conditions. Therefore, problems may arise on congested roads and highways. For example, the engine is started frequently on congested roads and has poor NVH. On highways, the engine is started at a lower SOC and has insufficient power generation after starting (relative to power consumption under high-speed conditions), making it difficult to maintain power. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a vehicle operating condition identification method and an operating condition identification device to overcome at least one of the above-mentioned defects.

[0005] In a first aspect, an embodiment of the present application provides a vehicle operating condition identification method, the method comprising: acquiring multiple characteristic parameters within a preset calculation cycle; for each characteristic parameter, determining an operating condition corresponding to at least one characteristic parameter interval in which the characteristic parameter falls, and outputting a sub-score of the characteristic parameter under the operating condition; for each operating condition, determining a characteristic parameter score of the vehicle for the operating condition within the preset calculation cycle based on the sub-scores of all characteristic parameters under the operating condition; and determining a target operating condition of the vehicle in the preset calculation cycle and an engine start-stop strategy based on the characteristic parameter score.

[0006] In an optional embodiment of the present application, the sub-score under each operating condition is output in the following manner: determine at least one characteristic parameter interval into which each characteristic parameter falls; determine the operating condition in which the characteristic parameter interval is located based on the characteristic parameter interval into which each characteristic parameter falls; output the sub-score of each operating condition in each characteristic parameter interval, each operating condition corresponds to multiple characteristic parameter intervals, and each characteristic parameter interval under each operating condition corresponds to a sub-score.

[0007] In an optional embodiment of the present application, the characteristic parameter score of each operating condition within the preset calculation period is determined in the following manner: the score weight of each characteristic parameter interval under each operating condition is pre-set, and each operating condition corresponds to multiple characteristic parameter intervals, and the score weight of the characteristic parameters in the characteristic parameter interval corresponding to each operating condition is the same; for each operating condition, the characteristic parameter score of the operating condition within the preset calculation period is determined according to the product of the sub-score of each characteristic parameter interval under the operating condition and the score weight.

[0008] In an optional embodiment of the present application, the characteristic parameter interval corresponding to the target operating condition is determined in the following manner: multiple typical operating conditions in the history of the vehicle are obtained; the values ​​of multiple characteristic parameters in the multiple typical operating conditions in the history of the vehicle are classified to determine multiple operating conditions; characteristic statistics are performed based on the multiple operating conditions to determine a preset number of target operating conditions, and multiple characteristic parameters under each target operating condition are determined; based on the values ​​of the characteristic parameters under each target operating condition, the characteristic parameter interval corresponding to the target operating condition is determined.

[0009] In an optional embodiment of the present application, the target operating condition of the vehicle in the preset calculation cycle is determined in the following manner: the characteristic parameter scores corresponding to each operating condition are sorted, and the candidate operating condition corresponding to the target characteristic parameter score is output; it is determined whether the candidate operating condition is one; if the candidate operating condition is one, the candidate operating condition is determined as the target operating condition; if the candidate operating condition is not one, one of the candidate operating conditions is determined as the target operating condition based on the operating condition priority.

[0010] In an optional embodiment of the present application, the engine start-stop strategy corresponding to the target operating condition is determined in the following manner: for the target operating condition, when it is detected that the current battery remaining power of the vehicle is less than or equal to the first preset battery remaining power of the target operating condition, the engine is turned on to power the vehicle; for the target operating condition, when it is detected that the current battery remaining power of the vehicle is greater than or equal to the second preset battery remaining power of the target operating condition, the engine is turned off to stop powering the vehicle.

[0011] In an optional embodiment of the present application, the engine start-stop strategy corresponding to the target operating condition is also determined in the following manner: for the target operating condition, when it is detected that the current battery remaining power of the vehicle is less than or equal to the third preset battery remaining power of the target operating condition, and the current vehicle speed is greater than or equal to the first preset speed, the engine is turned on to power the vehicle; for the target operating condition, when it is detected that the current battery remaining power of the vehicle is greater than or equal to the fourth preset battery remaining power of the target operating condition, and the current vehicle speed is less than or equal to the second preset speed, the engine is turned on to power the vehicle.

[0012] In a second aspect, an embodiment of the present application further provides a vehicle operating condition identification device, the device comprising: a characteristic parameter acquisition module, used to acquire multiple characteristic parameters within a preset calculation cycle; a sub-score output module, used to determine, for each characteristic parameter, the operating condition corresponding to at least one characteristic parameter interval in which the characteristic parameter falls, and output the sub-score of the characteristic parameter under the operating condition; a characteristic parameter score output module, used to determine, for each operating condition, the characteristic parameter score of the vehicle in the preset calculation cycle based on the sub-scores of all characteristic parameters under the operating condition; a target operating condition determination module, used to determine the target operating condition of the vehicle in the preset calculation cycle and the engine start-stop strategy based on the characteristic parameter score.

[0013] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: 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 method described above are performed.

[0014] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method described above are executed.

[0015] The vehicle operating condition identification method and operating condition identification device provided in the embodiment of the present application obtain multiple characteristic parameters within a preset calculation cycle; for each characteristic parameter, determine the operating condition corresponding to at least one characteristic parameter interval in which the characteristic parameter falls, and output the sub-score of the characteristic parameter under the operating condition; for each operating condition, determine the characteristic parameter score of the vehicle in the operating condition within the preset calculation cycle based on the sub-scores of all characteristic parameters under the operating condition; and determine the target operating condition of the vehicle in the preset calculation cycle and the engine start-stop strategy based on the characteristic parameter score. Through the present application, the target operating condition of the vehicle is determined, and the corresponding engine start-stop strategy is determined based on the target operating condition of the vehicle, which can solve the problems of engine start-up power generation delay and insufficient power generation under high-speed conditions, as well as frequent engine start-stop and poor NVH under congested conditions, optimize the power generation control of the whole vehicle, optimize the fuel consumption of the whole hybrid vehicle, and reduce the wear and failure rate of the engine.

[0016] 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

[0017] 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.

[0018] Figure 1 A flow chart of a vehicle operating condition identification method provided in an embodiment of the present application;

[0019] Figure 2 A flowchart for determining a characteristic parameter interval corresponding to a target operating condition of a vehicle provided in an embodiment of the present application;

[0020] Figure 3 A flowchart for determining the sub-scores under each working condition provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the structure of a vehicle operating condition identification device provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] 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.

[0024] First, the application scenarios to which this application is applicable are introduced. This application can be applied to the XX field.

[0025] Research has found that hybrid vehicles need to start the engine to charge the vehicle when the battery is low or the power consumption is high due to the SOC (State of Charge) power conservation requirement. Starting the engine in congested or low-speed roads will cause poor NVH (Noise, Vibration, Harshness). Starting the engine when the battery power is low on high-speed roads may not meet the power conservation requirement.

[0026] Based on this, the embodiment of the present application provides a vehicle operating condition identification method and operating condition identification device, which obtains multiple characteristic parameters within a preset calculation cycle; for each characteristic parameter, determines the operating condition corresponding to at least one characteristic parameter interval in which the characteristic parameter falls, and outputs the sub-score of the characteristic parameter under the operating condition; for each operating condition, determines the characteristic parameter score of the vehicle in the operating condition within the preset calculation cycle based on the sub-scores of all characteristic parameters under the operating condition; and determines the target operating condition of the vehicle in the preset calculation cycle and the engine start-stop strategy based on the characteristic parameter score. Through the present application, the target operating condition of the vehicle is determined, and the corresponding engine start-stop strategy is determined based on the target operating condition of the vehicle, which can solve the problems of engine start-up power generation delay and insufficient power generation under high-speed conditions, as well as frequent engine start-stop and poor NVH under congested conditions, optimize the power generation control of the whole vehicle, optimize the fuel consumption of the whole hybrid vehicle, and reduce the wear and failure rate of the engine.

[0027] The vehicle of the present application is a hybrid vehicle, which has a SOC (State of Charge, remaining battery power) power conservation requirement. When the battery power is low or the power consumption is high, the engine needs to be started to charge the vehicle.

[0028] In an optional embodiment, the target operating conditions of the hybrid vehicle are as follows:

[0029] 1) High-speed working condition: The driving power required is large. If the engine outputs ultra-high power, the efficiency is low and a roaring sound is likely to occur;

[0030] 2) Suburban working conditions: The driving power required coincides with the engine's high efficiency zone, and road and tire noise can easily mask engine noise;

[0031] 3) Urban driving conditions: Road noise and tire noise are not easy to cover engine noise, and the engine start and stop can be easily perceived by the driver;

[0032] 4) Congested conditions: In congested road conditions, the vehicle speed is low and the noise of the range extender is noticeable, but the range extender has low power generation efficiency.

[0033] The present application also has normal operating conditions, which are when the vehicle is traveling on a normal road section and the engine start and stop can be controlled according to the vehicle's normal engine start and stop strategy.

[0034] See also Figure 1 , Figure 1 This is a flow chart of the vehicle operating condition identification method provided in the embodiment of the present application. Figure 1 As shown in , the vehicle operating condition identification method provided by the embodiment of the present application includes:

[0035] S101. Acquire multiple characteristic parameters within a preset calculation cycle.

[0036] Among them, multiple characteristic parameters are the maximum speed of the vehicle (V max ), average speed (V avg ), acceleration maximum acceleration (A acc_max )、Deceleration maximum acceleration (A dec_max ), average acceleration (A acc_avg ), deceleration average acceleration (A dec_avg ) and parking idling time ratio (P de_idl )7 characteristic parameters that can better reflect the working conditions.

[0037] The meaning of each feature parameter is as follows:

[0038] 1) Average vehicle speed: the average value of vehicle speed in a single calculation cycle;

[0039] 2) Maximum vehicle speed: the maximum value of the vehicle speed in a single calculation cycle;

[0040] 3) Maximum acceleration: the maximum acceleration of the acceleration segment within a single calculation cycle;

[0041] 4) Average acceleration of acceleration: average acceleration of the acceleration segment within a single calculation cycle;

[0042] 5) Maximum deceleration acceleration: the minimum acceleration of the deceleration stage within a single calculation cycle (the acceleration of the deceleration stage is negative);

[0043] 6) Acceleration average acceleration: the average acceleration of the deceleration section within a single calculation cycle;

[0044] 7) Parking and idling time ratio: the ratio of parking or idling time to calculation cycle time in a single calculation cycle.

[0045] Here, after the vehicle is powered on, every 60 seconds (which can be calibrated according to the actual vehicle conditions) is a single calculation cycle, the preset calculation cycle is the second calculation cycle, and the first calculation cycle is the default working condition.

[0046] S102: For each characteristic parameter, determine the operating condition corresponding to at least one characteristic parameter interval within which the characteristic parameter falls, and output a sub-score of the characteristic parameter under the operating condition.

[0047] Specifically, see Figure 2 , Figure 2 This is a flow chart of determining the characteristic parameter interval corresponding to the target operating condition of the vehicle provided in the embodiment of the present application. Figure 2 As shown in , the vehicle operating condition identification method provided by the embodiment of the present application includes:

[0048] The characteristic parameter range corresponding to the target working condition is determined by the following method:

[0049] S201, obtaining multiple historical typical operating conditions of vehicles;

[0050] First, obtain a large amount of vehicle operation data from the vehicle history database. These characteristic parameters may include speed, acceleration, deceleration, driving time, engine load, fuel consumption rate, etc. These data should cover a variety of operating conditions and time periods. Then, remove outliers and missing values ​​to ensure the accuracy and completeness of the data.

[0051] For example, 32 typical working conditions are collected and 7 characteristic parameters of the 32 working conditions are analyzed. The working conditions and corresponding characteristic parameters are as follows:

[0052] Table 1

[0053]

[0054]

[0055]

[0056] S202, classifying the values ​​of multiple characteristic parameters in multiple historical typical operating conditions of the vehicle to determine multiple operating conditions;

[0057] Here, the most valuable parameters for working condition identification are selected from numerous characteristic parameters, and clustering algorithms (such as K-means, hierarchical clustering, etc.) are used to group the characteristic parameters to form multiple working condition categories.

[0058] For each characteristic parameter, it is divided into several intervals according to its distribution in historical data. The division of these intervals should be able to reflect the operating characteristics of the vehicle under different working conditions.

[0059] According to the characteristic parameters, 32 working conditions are classified, and the working conditions that meet the high-speed working conditions, suburban working conditions, urban working conditions, and congested working conditions are selected, and the working conditions that are not typical enough are discarded. A total of 28 typical working conditions that meet the high-speed working conditions, suburban working conditions, urban working conditions, and congested working conditions are selected, as follows:

[0060] Table 2

[0061]

[0062]

[0063] S203, performing feature statistics according to multiple working conditions, determining a preset number of target working conditions, and determining multiple feature parameters under each target working condition;

[0064] Among them, the working conditions that meet the preset working condition categories (such as highway, suburbs, cities, and congestion) are screened out from the clustering results, and a set of characteristic parameters that best reflect its characteristics are determined for each target working condition.

[0065] S204. Determine a characteristic parameter interval corresponding to each target operating condition according to the value of the characteristic parameter under the target operating condition.

[0066] For each characteristic parameter, a reasonable interval range is determined based on its distribution in historical data. Through verification and adjustment, it is ensured that the interval division can accurately reflect the operating characteristics of the vehicle under different working conditions.

[0067] The characteristic parameters of typical operating conditions in Table 2, which belong to congestion conditions, urban conditions, suburban conditions, and high-speed conditions, are statistically analyzed to obtain the characteristic parameter ranges, as follows:

[0068] Table 3. Characteristic parameter intervals of driving condition categories

[0069]

[0070] Specifically, the sub-scores under each working condition can be output in the following way:

[0071] Specifically, see Figure 3 , Figure 3 The flowchart for determining the sub-scores under each working condition provided in the embodiment of the present application is as follows. Figure 3 As shown in , the vehicle operating condition identification method provided by the embodiment of the present application includes:

[0072] S301, determining at least one characteristic parameter interval into which each characteristic parameter falls;

[0073] For each characteristic parameter (such as maximum speed, average speed, maximum acceleration, maximum deceleration, average acceleration, average deceleration, and idle ratio, etc.), the characteristic parameter interval it falls into is determined based on its actual value. These intervals are determined in advance based on historical data and can reflect the operating characteristics of the vehicle under different working conditions.

[0074] Each characteristic parameter may fall into multiple intervals. If it is 0, it means that the vehicle is in a stationary condition.

[0075] S302, determining the working condition of each characteristic parameter interval according to the characteristic parameter interval into which the characteristic parameter falls;

[0076] Here, for each characteristic parameter value, the corresponding working condition of the interval is found. The working condition can be predefined, such as high-speed working condition, suburban working condition, urban working condition, congested working condition, etc. This step needs to ensure that the mapping relationship between the interval and the working condition is accurate.

[0077] S303, outputting a sub-score of each operating condition in each characteristic parameter interval, each operating condition corresponds to a plurality of characteristic parameter intervals, and each characteristic parameter interval in each operating condition corresponds to a sub-score.

[0078] Each characteristic parameter interval that meets the characteristic working condition is scored 100 points: if the interval that the characteristic parameter value falls into is consistent with the characteristics of the working condition, it will be scored 100 points. For example, in the high-speed working condition, if the maximum speed V max If you fall into the high-speed area, you will get 100 points.

[0079] If not met, 0 points will be awarded: If the interval into which the characteristic parameter value falls does not match the characteristics of the working condition, 0 points will be awarded.

[0080] Use specific symbols or variables to represent the sub-score of each characteristic parameter under each condition. For example, G_ Vmax Indicates the maximum speed V max The sub-score under the corresponding working condition, G_ Vavg Indicates the average speed V avg The sub-scores under the corresponding working conditions, and so on.

[0081] For each working condition, output its sub-scores in all characteristic parameter intervals. In this way, each working condition will have a characteristic parameter score composed of multiple sub-scores.

[0082] S103. For each operating condition, determine the characteristic parameter score of the operating condition for the vehicle within a preset calculation period according to the sub-scores of all characteristic parameters under the operating condition.

[0083] Specifically, the characteristic parameter score of each working condition within the preset calculation cycle is determined in the following way:

[0084] The score weight of each characteristic parameter interval under each working condition is preset.

[0085] Each working condition corresponds to multiple characteristic parameter intervals, and the characteristic parameters in the characteristic parameter interval corresponding to each working condition have the same score weight;

[0086] The feature parameter score weights are shown in the following table:

[0087] Table 4

[0088]

[0089] Here, the score weight is usually set based on the importance of the feature parameter to the evaluation target. In this example, the average speed (V avg) is assigned the highest score weight (0.3) because average speed is more reflective of the overall performance or energy efficiency of the vehicle, while other parameters, such as maximum speed, maximum acceleration, etc., although also important, may not be as critical as average speed in the overall evaluation.

[0090] For each operating condition, the characteristic parameter score of the operating condition within a preset calculation period is determined according to the product of the sub-score of each characteristic parameter interval under the operating condition and the score weight.

[0091] The first calculation cycle is the default working condition. Starting from the second calculation cycle, the 7 characteristic calculation values ​​are compared with the driving condition characteristic parameter database. Every 60 seconds (TBC, which can be calibrated according to the actual vehicle conditions) is a single calculation cycle.

[0092] The characteristic parameter score corresponding to the target working condition is calculated by the following formula:

[0093] Grade=0.2×G _Vmax +0.3×G _Vavg +0.1×G _Aacc_max +0.1×G _Adec_max +

[0094] 0.1×G _Aacc_avg +0.1×G _Adec_avg +0.1×G _Pde_idl

[0095] Among them, Grade represents the characteristic parameter score under the target working condition, G _Vmax Indicates the maximum speed of the vehicle under the target working condition, G _Vavg Indicates the average speed of the vehicle under the target working condition, G _Aacc_max Indicates the maximum acceleration of the vehicle under the target condition, G Adec max Indicates the maximum acceleration of the vehicle under the target condition, G _Aacc_avg Indicates the average acceleration of the vehicle under the target condition, G _Adec_avg Indicates the average acceleration of the vehicle under the target working condition, G _Pde_idl Indicates the parking idling time ratio of the vehicle under the target operating conditions.

[0096] This scoring system can be applied to a variety of scenarios, such as vehicle performance evaluation, energy efficiency analysis, driving behavior analysis, etc. By calculating the characteristic parameter scores under each working condition, a comprehensive and objective evaluation of the vehicle's performance, energy efficiency or driving behavior can be performed, thus providing strong support for vehicle design, optimization or the formulation of driving strategies.

[0097] For example, we have a condition with the following characteristic parameter values:

[0098] V max =120km / h; V avg =80km / h; A acc_max =2.5m / s 2 ; A dec_max =-4.0m / s 2 ;

[0099] A acc avg =1.0m / s 2 ; A dec avg =-1.5m / s 2 ;P de idl =0.05

[0100]

[0101] Congestion condition Grae=0.2×0+0.3×0+0.1×100+0.1×0+0.1×100+0.1×0+0.1×100=30;

[0102] Urban working condition Grae=0.2×0+0.3×0+0.1×100+0.1×100+0.1×0+0.1×0+0.1×0=20;

[0103] Suburban working condition Grae=0.2×100+0.3×0+0.1×100+0.1×100+0.1×0+0.1×0+0.1×100=50;

[0104] High-speed working condition Grae=0.2×100+0.3×100+0.1×100+0.1×100+0.1×0+0.1×100+0.1×100=90;

[0105] The scores under the four operating conditions are compared to evaluate the vehicle performance or energy efficiency under different operating conditions.

[0106] S104: Determine the target operating condition of the vehicle in a preset calculation cycle and the engine start-stop strategy according to the characteristic parameter score.

[0107] The target operating conditions of the vehicle in the preset calculation cycle are determined by:

[0108] Sort the characteristic parameter scores corresponding to each working condition, and output the candidate working conditions corresponding to the target characteristic parameter scores;

[0109] Here, the characteristic parameter scores corresponding to each working condition are sorted, and the candidate working conditions are listed from high to low.

[0110] Determine whether there is one candidate operating condition; if there is one candidate operating condition, determine the candidate operating condition as the target operating condition; if there is not one candidate operating condition (the four operating conditions have the same score), determine one of the candidate operating conditions as the target operating condition based on the operating condition priority.

[0111] Among them, the sorted candidate operating condition list is checked to determine whether there is only one candidate operating condition. If there is only one candidate operating condition, the operating condition is directly determined as the target operating condition. If there is more than one candidate operating condition, further judgment is required based on the operating condition priority.

[0112] According to the set working condition priority (high-speed working condition > congested working condition > urban working condition > suburban working condition), the working condition with the highest priority is selected as the target working condition. The priority here can be set according to the actual situation and is not specifically limited here.

[0113] If multiple conditions have the same score and the same priority (this situation is rare, but theoretically possible), other factors (such as historical data, vehicle status, driver preference, etc.) can be considered to make the final decision.

[0114] If the scores of the four main operating conditions (congestion, city, suburbs, and highway) are all 0, the default operating condition will be output, such as static state or unknown operating condition. During the calculation process, if the characteristic parameter value is found to be abnormal (such as exceeding a reasonable range), data verification or correction should be performed to avoid misleading decision-making.

[0115] After determining the target operating conditions, you can formulate corresponding engine start-stop strategies based on the characteristics of the target operating conditions. The following are some possible strategy examples:

[0116] High-speed operating conditions: Under high-speed operating conditions, the vehicle is usually in a continuous driving state, and the engine should keep running continuously to improve fuel economy and power performance.

[0117] Congested driving conditions: In congested driving conditions, the vehicle starts and stops frequently, and the engine should also start and stop frequently accordingly to save fuel and reduce emissions. At this time, the intelligent start-stop system can be enabled to optimize the engine's operating efficiency.

[0118] Urban driving conditions: In urban driving conditions, vehicles travel at a slow speed and stop frequently. The engine start-stop strategy should balance fuel economy and driving comfort. You can consider shutting down the engine when the vehicle is parked for a long time and preheating the engine in advance when the vehicle is about to start.

[0119] Suburban operating conditions: Under suburban operating conditions, the vehicle's driving speed is moderate and relatively continuous, and the engine should maintain a stable operating state to improve fuel efficiency.

[0120] Default operating conditions: At rest or under unknown operating conditions, the engine should remain off or in low-power mode to reduce energy consumption and emissions.

[0121] The determination of the target operating conditions and the formulation of the engine start-stop strategy of this application should be as real-time and accurate as possible to adapt to the rapid changes in the vehicle's driving state. When formulating the engine start-stop strategy, it should be ensured that the safety and stability of the vehicle are not affected. For example, in emergency braking or turning situations, the engine should remain running to ensure the power supply and stability of the vehicle. Taking into account the personalized needs of different drivers (such as driving style, preferences, etc.), the engine start-stop strategy can be set to an adjustable or customizable mode to meet the needs of different drivers.

[0122] In an optional embodiment, the engine start-stop strategy corresponding to the target operating condition may be determined in the following manner:

[0123] For a target operating condition, when it is detected that the current remaining battery power of the vehicle is less than or equal to a first preset remaining battery power of the target operating condition, starting the engine to power the vehicle;

[0124] Here, the first preset battery remaining power and engine start strategy are as follows:

[0125] For each target operating condition (such as congestion, city, suburbs, highway, etc.), a first preset battery remaining power threshold is set.

[0126] When the vehicle is traveling under the current target operating conditions and detects that the remaining battery power is less than or equal to the threshold, the engine is automatically started to power the vehicle to ensure the normal operation of the vehicle and the comfort of the driver.

[0127] For the target operating condition, when it is detected that the current remaining battery power of the vehicle is greater than or equal to a second preset remaining battery power of the target operating condition, the engine is turned off to stop powering the vehicle.

[0128] Likewise, a second preset battery remaining power threshold (usually higher than the first preset threshold) is set for each target operating condition.

[0129] When the vehicle is traveling under the current target operating conditions and detects that the remaining battery power is greater than or equal to the threshold, the engine is automatically shut down to stop directly powering the vehicle, thereby saving fuel and reducing emissions.

[0130] In actual applications, the first and second preset battery remaining power thresholds can be adjusted and optimized according to factors such as vehicle type, battery capacity, and operating conditions. Intelligent learning algorithms can be introduced to dynamically adjust these thresholds based on the vehicle's historical driving data and driver habits to improve the adaptability and accuracy of the strategy.

[0131] In another optional embodiment, the engine start-stop strategy corresponding to the target operating condition may also be determined in the following manner:

[0132] For the target operating condition, when it is detected that the current battery remaining power of the vehicle is less than or equal to a third preset battery remaining power of the target operating condition, and the current vehicle speed is greater than or equal to the first preset speed, starting the engine to power the vehicle;

[0133] Here, for each target operating condition, a third preset battery remaining power threshold and a first preset speed threshold are set.

[0134] When the vehicle is traveling under the current target operating condition and the remaining battery power is less than or equal to the third preset threshold and the current vehicle speed is greater than or equal to the first preset speed, the engine is turned on to power the vehicle. This strategy is suitable for situations where the vehicle needs to accelerate quickly or maintain high speed.

[0135] For the target operating condition, when it is detected that the current battery remaining power of the vehicle is greater than or equal to the fourth preset battery remaining power of the target operating condition, and the current vehicle speed is less than or equal to the second preset speed, the engine is started to power the vehicle.

[0136] Likewise, a fourth preset battery remaining power threshold and a second preset speed threshold (usually lower than the first preset speed) are set for each target operating condition.

[0137] However, it should be noted here that when the vehicle is traveling under the current target operating conditions and at the same time satisfies the remaining battery power greater than or equal to the fourth preset threshold and the current vehicle speed is less than or equal to the second preset speed, the engine does not need to be turned off directly, and it can be determined whether to turn on the engine based on the specific situation.

[0138] For example, when driving at low speeds and the battery is fully charged, the engine can be kept off to save fuel and reduce emissions; but in certain special circumstances (such as frequent starting and stopping, the need to maintain the temperature in the car, etc.), the engine may need to be turned on to provide additional power support.

[0139] When formulating this engine start-stop strategy that combines multiple parameters, it is necessary to fully consider the vehicle operating characteristics and driver needs under various working conditions. Intelligent control methods such as fuzzy logic or neural networks can be introduced to dynamically adjust strategy parameters based on real-time data to achieve more precise control and a better driving experience.

[0140] This application only describes the start-stop strategy under different working conditions in EV (pure electric priority) mode. This start-stop strategy is in parallel with other start-stop strategies. In addition, the engine start SOC is higher in REV (fuel priority) mode, so the start-stop strategy under the working conditions is not performed.

[0141] 1) Engine start-stop strategy under normal working conditions:

[0142] i: When the battery SOC is ≤8%, the engine is started; when the battery SOC is ≥10%, the engine is shut down;

[0143] ii: When the battery SOC is ≤25% and the vehicle speed is ≥40km / h, start the engine; when the battery SOC is ≥30% or the vehicle speed is ≤30km / h, shut down the engine;

[0144] Under normal working conditions, either condition i or condition ii can be satisfied.

[0145] 2) Engine start-stop strategy under congested conditions: Under congested conditions, the vehicle speed is low. Because the power generation is low and charging is slow when the vehicle speed is low, the engine needs to be started in advance and shut down later under congested conditions. In addition, when the vehicle speed is low, the engine NVH has a greater impact on the driver. Therefore, the strategy should be to reduce the engine start at very low speeds and try to reduce the starting speed to avoid causing the SOC to be too low, resulting in the engine starting at very low speeds. The relevant strategies are as follows:

[0146] i: When the battery SOC is ≤17%, start the engine; when the battery SOC is ≥21%, shut down the engine;

[0147] ii: When the battery SOC is ≤25% and the vehicle speed is ≥30km / h, start the engine; when the battery SOC is ≥30%, or the vehicle speed is ≤15km / h, shut down the engine;

[0148] Under congested conditions, either condition i or condition ii can be satisfied.

[0149] 3) Engine start-stop strategy under high-speed conditions: Under high-speed conditions, the vehicle consumes more energy. In order to avoid power battery depletion, the engine needs to be started in advance.

[0150] i: When the battery SOC is ≤20%, start the engine; when the battery SOC is ≥30%, shut down the engine;

[0151] ii: When the battery SOC is ≤40% and the vehicle speed is ≥40km / h, start the engine; when the battery SOC is ≥42%, or the vehicle speed is ≤30km / h, shut down the engine.

[0152] Under high-speed conditions, either condition i or condition ii can be met.

[0153] 4) Engine start-stop strategy in urban conditions:

[0154] Urban conditions refer to driving conditions within the city, where vehicle speeds are mainly concentrated in the medium and low speeds, and there are traffic lights and stops. Therefore, NVH and avoidance of frequent starts and stops need to be considered when formulating strategies.

[0155] i: When the battery SOC is ≤12%, start the engine; when the battery SOC is ≥15%, shut down the engine;

[0156] ii: When the battery SOC is ≤25% and the vehicle speed is ≥40km / h, start the engine; when the battery SOC is ≥30%, or the vehicle speed is ≤30km / h, shut down the engine.

[0157] Under urban conditions, either condition i or condition ii can be satisfied.

[0158] 5) Engine start-stop strategy in suburban conditions: Suburban conditions are ideal operating conditions for vehicles, and the main considerations for operation under these conditions are economy and power.

[0159] i: When the battery SOC is ≤12%, start the engine; when the battery SOC is ≥15%, shut down the engine;

[0160] ii: When the battery SOC is ≤25% and the vehicle speed is ≥40km / h, start the engine; when the battery SOC is ≥30%, or the vehicle speed is ≤35km / h, shut down the engine.

[0161] Under suburban conditions, either condition i or condition ii can be satisfied.

[0162] In summary, the battery SOC and vehicle speed under each of the above operating conditions are all embodiments, and can actually be set according to specific circumstances. The battery SOC and vehicle speed are not specifically limited here.

[0163] The vehicle operating condition identification method and operating condition identification device provided in the embodiments of the present application obtain multiple characteristic parameters within a preset calculation cycle; for each characteristic parameter, determine the operating condition corresponding to at least one characteristic parameter interval in which the characteristic parameter falls, and output the sub-score of the characteristic parameter under the operating condition; for each operating condition, determine the characteristic parameter score of the vehicle in the operating condition within the preset calculation cycle based on the sub-scores of all characteristic parameters under the operating condition; based on the characteristic parameter scores, determine the target operating condition of the vehicle in the preset calculation cycle and the engine start-stop strategy. Through the present application, the target operating condition of the vehicle is determined, and the corresponding engine start-stop strategy is determined based on the target operating condition of the vehicle, which can solve the problems of engine start-up power generation delay and insufficient power generation under high-speed conditions and frequent engine start-stop and poor NVH under congested conditions, optimize the power generation control of the whole vehicle, optimize the fuel consumption of hybrid vehicles, and reduce engine wear and failure rate.

[0164] The present application identifies the current operating condition of the hybrid vehicle and can implement independent control logic for the power generation strategies within the four operating conditions; accurate identification of the operating condition can solve the problems of engine start-up power generation delay and insufficient power generation under high-speed conditions; accurate identification of the operating condition can solve the problems of frequent engine start-stop and poor NVH under congested conditions; accurate identification of the operating condition can optimize the power generation control of the entire vehicle and optimize the fuel consumption of the hybrid vehicle; start-stop strategies are formulated according to different operating conditions to meet the optimal control of the start-stop of the hybrid vehicle engine.

[0165] The present application divides common operating conditions of hybrid vehicles into congested conditions, urban conditions, suburban conditions, and high-speed conditions; defines seven characteristic values: maximum speed, average speed, maximum acceleration during acceleration, maximum acceleration during deceleration, average acceleration during acceleration, average acceleration during deceleration, and parking idle time ratio; selects 28 operating conditions for classification, and calculates the numerical ranges of the seven characteristic values ​​of congested conditions, urban conditions, suburban conditions, and high-speed conditions in the classification; defines an algorithm for calculating characteristic values, which uses 60 seconds as a calculation cycle, and the calculation results continue until the next cycle, and replace the calculation results of the previous cycle after the next cycle is completed; defines an operating condition identification rule: uses seven characteristic values ​​and corresponding weights, and defines the one with the highest score as the current actual operating condition; formulates engine start-stop strategies under four operating conditions: formulates the optimal control strategy based on vehicle speed, SOC, and current operating conditions.

[0166] Based on the same inventive concept, a vehicle operating condition identification device corresponding to the vehicle operating condition identification method is also provided in the embodiment of the present application. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the above-mentioned vehicle operating condition identification method in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0167] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of the vehicle operating condition identification device provided in the embodiment of the present application. Figure 4 As shown in , the vehicle operating condition identification device 400 includes:

[0168] The characteristic parameter acquisition module 401 is used to acquire multiple characteristic parameters within a preset calculation period;

[0169] A sub-score output module 402 is used to determine, for each characteristic parameter, an operating condition corresponding to at least one characteristic parameter interval in which the characteristic parameter falls, and output a sub-score of the characteristic parameter under the operating condition;

[0170] The characteristic parameter score output module 403 is used to determine, for each operating condition, the characteristic parameter score of the vehicle in the operating condition within the preset calculation period according to the sub-scores of all characteristic parameters in the operating condition;

[0171] The target operating condition determination module 404 is used to determine the target operating condition of the vehicle and the engine start-stop strategy in the preset calculation cycle according to the characteristic parameter score.

[0172] See also Figure 5 , Figure 5 This is a schematic diagram of the structure of the electronic device provided in the embodiment of the present application. Figure 5 As shown in , the electronic device 500 includes a processor 510 , a memory 520 and a bus 530 .

[0173] The memory 520 stores machine-readable instructions executable by the processor 510. When the electronic device 500 is running, the processor 510 communicates with the memory 520 via the bus 530. When the machine-readable instructions are executed by the processor 510, the above-mentioned Figure 1 The specific implementation of the steps of the vehicle operating condition identification method in the method embodiment shown can be found in the method embodiment, and will not be repeated here.

[0174] 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 specific implementation of the steps of the vehicle operating condition identification method in the method embodiment shown can be found in the method embodiment, and will not be repeated here.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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 vehicle operating condition identification method, characterized in that: include: Obtaining multiple characteristic parameters within a preset calculation period; For each characteristic parameter, determine the operating condition corresponding to at least one characteristic parameter interval within which the characteristic parameter falls, and output a sub-score of the characteristic parameter under the operating condition; For each operating condition, determining a characteristic parameter score of the vehicle in the operating condition within the preset calculation period according to the sub-scores of all characteristic parameters in the operating condition; The target operating condition of the vehicle in the preset calculation cycle and the engine start-stop strategy are determined according to the characteristic parameter score.

2. The method according to claim 1, characterized in that The sub-scores for each load case are output as follows: determining at least one feature parameter interval within which each feature parameter falls; According to the characteristic parameter interval into which each characteristic parameter falls, determining the working condition of the characteristic parameter interval; Output the sub-score of each working condition in each characteristic parameter interval. Each working condition corresponds to multiple characteristic parameter intervals, and each characteristic parameter interval in each working condition corresponds to a sub-score.

3. The method according to claim 2, characterized in that The characteristic parameter score of each working condition in the preset calculation period is determined by: The score weight of each characteristic parameter interval under each working condition is preset, and each working condition corresponds to multiple characteristic parameter intervals, and the score weights of the characteristic parameters in the characteristic parameter interval corresponding to each working condition are the same; For each operating condition, the characteristic parameter score of the operating condition within a preset calculation period is determined according to the product of the sub-score of each characteristic parameter interval under the operating condition and the score weight.

4. The method according to claim 1, characterized in that: The characteristic parameter range corresponding to the target working condition is determined by the following method: Obtain historical typical operating conditions of multiple vehicles; Classifying the values ​​of multiple characteristic parameters in multiple historical typical operating conditions of the vehicles to determine multiple operating conditions; Performing feature statistics based on multiple working conditions, determining a preset number of target working conditions, and determining multiple feature parameters under each target working condition; According to the value of the characteristic parameter under each target operating condition, the characteristic parameter interval corresponding to the target operating condition is determined.

5. The method according to claim 3, characterized in that: The target operating condition of the vehicle in the preset calculation cycle is determined by: Sort the characteristic parameter scores corresponding to each working condition, and output the candidate working conditions corresponding to the target characteristic parameter scores; Determining whether the candidate operating condition is one; If there is one candidate operating condition, determining the candidate operating condition as the target operating condition; If there is more than one candidate operating condition, one of the candidate operating conditions is determined as the target operating condition according to the operating condition priority.

6. The method according to claim 5, characterized in that The engine start-stop strategy corresponding to the target operating condition is determined by the following method: For a target operating condition, when it is detected that the current remaining battery power of the vehicle is less than or equal to a first preset remaining battery power of the target operating condition, starting the engine to power the vehicle; For the target operating condition, when it is detected that the current remaining battery power of the vehicle is greater than or equal to a second preset remaining battery power of the target operating condition, the engine is turned off to stop powering the vehicle.

7. The method according to claim 6, characterized in that The engine start-stop strategy corresponding to the target operating condition is also determined in the following way: For the target operating condition, when it is detected that the current battery remaining power of the vehicle is less than or equal to a third preset battery remaining power of the target operating condition, and the current vehicle speed is greater than or equal to the first preset speed, starting the engine to power the vehicle; For the target operating condition, when it is detected that the current battery remaining power of the vehicle is greater than or equal to the fourth preset battery remaining power of the target operating condition, and the current vehicle speed is less than or equal to the second preset speed, the engine is started to power the vehicle.

8. A vehicle operating condition identification device, characterized in that: include: A characteristic parameter acquisition module is used to acquire multiple characteristic parameters within a preset calculation cycle; A sub-score output module, used to determine, for each characteristic parameter, an operating condition corresponding to at least one characteristic parameter interval within which the characteristic parameter falls, and output a sub-score of the characteristic parameter under the operating condition; A characteristic parameter score output module, for determining, for each operating condition, a characteristic parameter score of the vehicle in the operating condition within the preset calculation period according to the sub-scores of all characteristic parameters under the operating condition; The target operating condition determination module is used to determine the target operating condition of the vehicle and the engine start-stop strategy in the preset calculation cycle according to the characteristic parameter score.

9. 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 via the bus, and the processor executes the machine-readable instructions to perform the steps of any method as claimed in claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are executed.

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