A pure electric vehicle driving range estimation method and device and a pure electric vehicle

Abstract

The application belongs to the technical field of new energy vehicles, and particularly relates to a pure electric vehicle driving range estimation method and device and a pure electric vehicle, the method comprising: determining first average power consumption of necessary electrical equipment according to historical power consumption information or first preset power consumption of the necessary electrical equipment; determining second average power consumption of an air conditioning system according to historical power consumption information or second preset power consumption of the air conditioning system; obtaining current residual available power of a battery pack; and determining residual driving range according to the first average power consumption, the second average power consumption and the residual available power. In the application, the power consumption of driving, air conditioning and battery pack heating is decoupled when calculating vehicle power consumption, the residual driving range is dynamically displayed, and the reliability of the driving range estimation result is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of new energy vehicles, and particularly relates to a pure electric vehicle driving range estimation method and device and a pure electric vehicle. BACKGROUND

[0002] The driving range estimation method of the pure electric vehicle still has many defects at present. For example, the NEDC (New European Driving Cycle) range is linearly related to the SOC (State of charge) and SOH (State of health) to estimate the driving range. With the deterioration of the battery health, it is difficult for the vehicle owner to grasp how much the actual driving range of the vehicle is. For another example, the average power consumption is used to calculate the remaining driving range. In special working conditions, the calculated driving range will decrease significantly. For example, in winter in the north, frequent interval short-distance driving, high-voltage battery pack heating and air conditioning heating will cause the power consumption to increase sharply. At this time, the driving range of the vehicle will decrease significantly, but in fact, the average power consumption of the vehicle will not be so high when driving for a long distance. The above two estimation methods are easy to mislead the vehicle owner and reduce the driving experience. SUMMARY

[0003] In view of the above-mentioned defects of the prior art, the purpose of the present application is to provide a pure electric vehicle driving range estimation method and device and a pure electric vehicle which can improve the estimation accuracy of the driving range.

[0004] To achieve the above-mentioned purpose and other related purposes, the present application provides a pure electric vehicle driving range estimation method, comprising the following steps:

[0005] According to the historical power consumption information of the necessary electric equipment or the first preset power consumption, the first average power consumption of the necessary electric equipment is determined, and the necessary electric equipment at least includes a driving motor;

[0006] According to the historical power consumption information of the air conditioning system or the second preset power consumption, the second average power consumption of the air conditioning system is determined;

[0007] The current remaining available power of the battery pack is obtained;

[0008] According to the first average power consumption, the second average power consumption and the remaining available power, the remaining driving range is determined.

[0009] In an optional embodiment of the present application, the following steps are further included:

[0010] According to the current environmental temperature, the estimated power consumption of the battery heating system is determined;

[0011] determining a remaining driving range of the vehicle according to the first average power consumption, the second average power consumption, and the remaining available power.

[0012] In an optional embodiment of the present application, the method further comprises the following steps:

[0013] determining an increased driving range of the vehicle by turning off the air conditioning system according to the first average power consumption, the second average power consumption, and the remaining available power.

[0014] In an optional embodiment of the present application, the method further comprises the following steps:

[0015] sending the remaining driving range, the driving range consumed by the battery heating system, and the increased driving range by turning off the air conditioning system to a visual interactive interface.

[0016] In an optional embodiment of the present application, the step of determining the first average power consumption of the necessary power-consuming device according to historical power consumption information of the necessary power-consuming device comprises:

[0017] extracting a first target driving range of a first preset length from historical driving ranges as the first target driving range, and obtaining first historical current data of the necessary power-consuming device corresponding to the first target driving range;

[0018] determining a first interval power consumption of the necessary power-consuming device within the first target driving range according to the first historical current data;

[0019] determining the first average power consumption of the necessary power-consuming device according to the first target driving range and the first interval power consumption.

[0020] In an optional embodiment of the present application, the step of extracting a first target driving range of a first preset length from historical driving ranges as the first target driving range, and obtaining first historical current data of the necessary power-consuming device corresponding to the first target driving range comprises:

[0021] marking the historical driving ranges according to historical positioning data to determine urban historical driving ranges and highway historical driving ranges;

[0022] extracting a target urban driving range of the first preset length from the urban historical driving ranges as the target urban driving range, and obtaining urban historical current data of the necessary power-consuming device corresponding to the target urban driving range;

[0023] extracting a target highway driving range of the first preset length from the highway historical driving ranges as the target highway driving range, and obtaining highway historical current data of the necessary power-consuming device corresponding to the target highway driving range.

[0024] In an optional embodiment of the present application, the step of determining the first interval power consumption of the necessary electrical equipment in the first target driving range according to the first historical current data comprises:

[0025] determining the urban interval power consumption of the necessary electrical equipment in the urban target driving range according to the urban historical current data;

[0026] determining the high-speed interval power consumption of the necessary electrical equipment in the high-speed target driving range according to the high-speed historical current data.

[0027] In an optional embodiment of the present application, the step of determining the first average power consumption of the necessary electrical equipment according to the first target driving range and the first interval power consumption comprises:

[0028] determining the urban average power consumption of the necessary electrical equipment according to the urban target driving range and the urban interval power consumption;

[0029] determining the high-speed average power consumption of the necessary electrical equipment according to the high-speed target driving range and the high-speed interval power consumption.

[0030] In an optional embodiment of the present application, the step of determining the remaining driving range according to the first average power consumption, the second average power consumption and the remaining available power comprises:

[0031] determining that the current is in an urban working condition or a high-speed working condition according to current positioning information;

[0032] when the current is in the urban working condition, determining the remaining driving range according to the urban average power consumption, the second average power consumption and the remaining available power;

[0033] when the current is in the high-speed working condition, determining the remaining driving range according to the high-speed average power consumption, the second average power consumption and the remaining available power.

[0034] In an optional embodiment of the present application, the step of determining the second average power consumption of the air conditioning system according to historical power consumption information of the air conditioning system comprises:

[0035] cutting a second preset length of historical driving range in the on state of the air conditioning system as a second target driving range, and obtaining second historical current data of the air conditioning system corresponding to the second target driving range;

[0036] determining a second interval power consumption of the air conditioning system in the second target driving range according to the second historical current data;

[0037] determine the second average power consumption according to the second interval power consumption and the second target driving range.

[0038] In an optional embodiment of the present application, the step of intercepting the second preset length of historical driving range in the on state of the air conditioning system as the second target driving range and obtaining the second historical current data of the air conditioning system corresponding to the second target driving range comprises:

[0039] intercepting the latest second preset length of historical driving range in the heating state of the air conditioning system as a heating target driving range and obtaining historical heating current data of the air conditioning system corresponding to the heating target driving range;

[0040] intercepting the latest second preset length of historical driving range in the refrigeration state of the air conditioning system as a refrigeration target driving range and obtaining historical refrigeration current data of the air conditioning system corresponding to the refrigeration target driving range.

[0041] In an optional embodiment of the present application, the step of determining the second interval power consumption of the air conditioning system in the second target driving range according to the second historical current data comprises:

[0042] determining a heating interval power consumption of the air conditioning system in the heating target driving range according to the historical heating current data;

[0043] determining a refrigeration interval power consumption of the air conditioning system in the refrigeration target driving range according to the historical refrigeration current data.

[0044] In an optional embodiment of the present application, the step of determining the second average power consumption according to the second interval power consumption and the second target driving range comprises:

[0045] determining a heating average power consumption according to the heating interval power consumption and the heating target driving range;

[0046] determining a refrigeration average power consumption according to the heating interval power consumption and the heating target driving range.

[0047] In an optional embodiment of the present application, the step of determining the remaining driving range according to the first average power consumption, the second average power consumption and the remaining available power consumption comprises:

[0048] when the air conditioning system is in the heating state, determining the remaining driving range according to the first average power consumption, the heating average power consumption and the remaining available power consumption;

[0049] When the air conditioning system is in the cooling state currently, the remaining driving range is determined according to the first average power consumption, the average power consumption in cooling and the remaining available power.

[0050] In an optional embodiment of the present application, the method further comprises the following steps:

[0051] The first average temperature in the vehicle, the second average temperature in the vehicle and the current temperature in the vehicle are obtained;

[0052] When the air conditioning system is in the heating state currently, if the difference between the current temperature in the vehicle and the first average temperature in the vehicle is greater than a first preset value, the second average power consumption of the air conditioning system is determined according to a preset heating power consumption.

[0053] When the air conditioning system is in the cooling state currently, if the difference between the current temperature in the vehicle and the second average temperature in the vehicle is greater than a second preset value, the second average power consumption of the air conditioning system is determined according to a preset cooling power consumption.

[0054] In an optional embodiment of the present application, the step of determining the estimated power consumption of the battery heating system according to the current ambient temperature comprises:

[0055] The heat required for heating the battery pack is calculated according to the target heating temperature of the battery pack, the average temperature of the current single battery cell, the average specific heat capacity of the battery pack material and the mass of the battery pack.

[0056] The heat required for heating the heating circuit is calculated according to the target condensate water temperature of the heating circuit, the actual temperature of the current condensate water, the specific heat capacity of the condensate water and the mass of the condensate water.

[0057] The estimated power consumption of the battery heating system is calculated according to the heat required for heating the battery pack, the heat required for heating the heating circuit, the operating voltage of the battery heating system and the energy efficiency conversion ratio.

[0058] To achieve the above object and other related objects, the present application further provides a pure electric vehicle driving range estimation device, comprising:

[0059] The necessary power consumption acquisition module is configured to determine the first average power consumption of the necessary power consumption device according to historical power consumption information of the necessary power consumption device or a first preset power consumption, wherein the necessary power consumption device at least includes a driving motor.

[0060] The air conditioning power consumption acquisition module is configured to determine the second average power consumption of the air conditioning system according to historical power consumption information of the air conditioning system or a second preset power consumption.

[0061] The battery power acquisition module is configured to obtain the remaining available power of the battery pack currently.

[0062] A driving range estimation module is configured to determine a remaining driving range based on the first average power consumption, the second average power consumption, and the remaining available power.

[0063] To achieve the above object and other related objects, the present application further provides a pure electric vehicle comprising the pure electric vehicle driving range estimation device.

[0064] The present application has the technical effect that, in calculating the power consumption of the vehicle, the power consumption of driving, air conditioning, and battery pack heating is decoupled, and the remaining driving range is dynamically displayed. Each time the vehicle is used, the amount of power required to heat the battery pack to the target temperature is estimated in advance according to the current temperature of the battery pack and the ambient temperature, the remaining power is used for driving and air conditioning, and the increased driving range that can be obtained by turning off the air conditioner is calculated in real time and visually fed back to the vehicle owner, thereby improving the reliability of the driving range estimation result. BRIEF DESCRIPTION OF DRAWINGS

[0065] Figure 1 is a structure block diagram of the application environment of the pure electric vehicle driving range estimation method provided by the embodiment of the present application;

[0066] Figure 2 is a flowchart of the pure electric vehicle driving range estimation method provided by the embodiment of the present application;

[0067] Figure 3 is a flowchart of the first average power consumption determination method provided by the embodiment of the present application;

[0068] Figure 4 is a flowchart of the first average power consumption determination and application method in different scenarios provided by the embodiment of the present application;

[0069] Figure 5 is a flowchart of the second average power consumption determination method provided by the embodiment of the present application;

[0070] Figure 6 is a flowchart of the second average power consumption determination and application method in different scenarios provided by the embodiment of the present application;

[0071] Figure 7 is a flowchart of the second average power consumption determination method provided by the supplementary embodiment of the present application;

[0072] Figure 8 is a flowchart of the battery heating system estimated power consumption calculation method provided by the embodiment of the present application;

[0073] Figure 9 is a functional module block diagram of the pure electric vehicle driving range estimation device provided by the embodiment of the present application;

[0074] Figure 10 is a display effect diagram of the remaining range, the range consumed by the battery heating system, and the range that can be increased by turning off the air conditioning system on the visual interactive interface provided by the embodiment of the present application; wherein the uppermost layer represents the range that can be increased by turning off the air conditioning system, the middle layer represents the remaining range of the vehicle, and the lowermost layer represents the range predicted to be consumed by the battery preheating. DETAILED DESCRIPTION

[0075] The advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present specification. The present application can also be implemented or applied by different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0076] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be a random change, and the component layout pattern may be more complex.

[0077] The display of the driving range of an electric vehicle is generally achieved through a series of sensors and computing systems mounted on the vehicle. These sensors can monitor the battery power, motor power output, vehicle speed, driving behavior, and other information. Then, through algorithms, these data are analyzed and calculated to obtain the remaining driving range of the electric vehicle, and displayed on the vehicle's instrument panel or center screen. Displaying the driving range can help the driver understand the distance the electric vehicle can travel, so as to better plan the journey and charging plan, and improve the convenience and comfort of driving. For long-distance driving or areas without charging stations, displaying the driving range can help the driver make decisions in real time during driving, avoiding the trouble caused by insufficient power. Knowing the remaining driving range in a timely manner can avoid the vehicle stalling on the road due to insufficient power, thereby improving driving safety. Accurate display of the driving range can increase users' confidence in electric vehicles and acceptance, promoting the promotion and popularization of electric vehicles.

[0078] However, there are still many defects in the current estimation method of the pure electric vehicle range, for example, the NEDC (New European Driving Cycle) range is associated with the SOC (State of charge) and SOH (State of health) in a linear manner to estimate the driving range, and with the deterioration of the battery health, it is difficult for the owner to grasp the actual remaining range of the vehicle; for example, the average power consumption is used to calculate the remaining driving range, and in special working conditions, the calculated driving range will decrease significantly, for example, in winter in the north, frequent interval short distance driving, high voltage battery pack heating and air conditioning heating will cause the power consumption to increase sharply, at this time the driving range of the vehicle will decrease significantly, but in fact the average power consumption of the vehicle will not be so high. The above two estimation methods are easy to mislead the owner and reduce the driving experience. Therefore, the present application calculates the average power consumption of the vehicle according to the real historical power consumption data of the vehicle, and estimates the driving range of the vehicle according to the average power consumption, which improves the reliability of the driving range estimation result. At the same time, the present application subdivides the historical power consumption data according to the driving scene, and gives the historical average power consumption in different scenes, and the vehicle calls the historical power consumption data of the same driving scene according to the current working condition to estimate the driving range, which further improves the reliability of the estimation result.

[0079] Referring to Figures 1-10 The technical solutions of the present application will be described in detail below in combination with specific embodiments:

[0080] Referring to Figure 2 The pure electric vehicle driving range estimation method provided by the embodiments of the present application comprises:

[0081] S10: determining the first average power consumption of the necessary power consumption equipment according to the historical power consumption information or the first preset power consumption of the necessary power consumption equipment, the necessary power consumption equipment at least including a driving motor, and in specific embodiments, the necessary power consumption equipment also includes small power functional accessories necessary for vehicle driving, such as central control, radar, camera, sensor, lighting device, etc.

[0082] Referring to Figure 3 In an optional embodiment of the present application, step S10 comprises:

[0083] S11: intercepting a first preset length of the historical driving range from the historical driving range as a first target driving range, and obtaining the first historical current data of the necessary power consumption equipment corresponding to the first target driving range.

[0084] Referring to Figure 4As shown in an optional embodiment of the present application, step S11 comprises:

[0085] S110: Marking the historical driving mileage according to historical positioning data, determining urban historical driving mileage and highway historical driving mileage.

[0086] S111: Taking a latest segment of the first preset length of the urban historical driving mileage as urban target driving mileage, and obtaining urban historical current data of the necessary electrical equipment corresponding to the urban target driving mileage.

[0087] S112: Taking a latest segment of the first preset length of the highway historical driving mileage as highway target driving mileage, and obtaining highway historical current data of the necessary electrical equipment corresponding to the highway target driving mileage.

[0088] Please refer to Figure 3 As shown in an optional embodiment of the present application, step S10 further comprises:

[0089] S12: Determining a first interval power consumption of the necessary electrical equipment within the first target driving mileage according to the first historical current data.

[0090] Please refer to Figure 4 As shown in an optional embodiment of the present application, step S12 comprises:

[0091] S121: Determining urban interval power consumption of the necessary electrical equipment within the urban target driving mileage according to the urban historical current data.

[0092] S122: Determining highway interval power consumption of the necessary electrical equipment within the highway target driving mileage according to the highway historical current data.

[0093] Please refer to Figure 3 As shown in an optional embodiment of the present application, step S10 further comprises:

[0094] S13: Determining a first average power consumption of the necessary electrical equipment according to the first target driving mileage and the first interval power consumption.

[0095] Please refer to Figure 4 As shown in an optional embodiment of the present application, step S13 comprises:

[0096] S131: Determining urban average power consumption of the necessary electrical equipment according to the urban target driving mileage and the urban interval power consumption.

[0097] S132: determining the high-speed average power consumption of the necessary power consumption device according to the high-speed target driving distance and the high-speed section power consumption.

[0098] The calculation method of the first average power consumption is described in detail below in combination with specific embodiments:

[0099] First, the vehicle speed is obtained by the rotation speed of the driving motor:

[0100] V=π*d*n;

[0101] V represents the vehicle speed, unit: m / s; d represents the tire diameter, unit: m; n represents the driving motor rotation speed, unit: r / s, provided by the motor controller DU, and then the vehicle speed is integrated to obtain the driving distance of the vehicle:

[0102] L=∫(V)dt=∫(π*d*n)dt;

[0103] L represents the driving distance of the vehicle, unit: m. It should be understood that in other embodiments, the historical driving distance can also be obtained by other ways, for example, the historical driving distance is calculated according to the detection data of the wheel speed sensor, or the historical driving distance is directly obtained according to the vehicle positioning data.

[0104] The power consumption calculation formula of the vehicle driving and low-power functional accessories (i.e. the necessary power consumption device) is as follows, that is, the direct current bus current at the input end of the driving motor is summed up:

[0105] P=∫(I)dt;

[0106] I is the current of the vehicle driving and low-power functional accessories, unit: A, which is calculated by the actual current I B of the high-voltage battery pack, the current I AC consumed by the air conditioning system, and the input current I P of PackPTC (battery pack electric heating device):

[0107] I=I B –I P –I AC；

[0108] Thus, the power consumption P of the driving system and related functional accessories is obtained, unit: As; and the average power consumption DE of the vehicle driving and low-power functional accessories is:

[0109] DE=L / P=(∫(π*d*n)dt) / (∫(I)dt).

[0110] The hardware environment of the application is as follows: Figure 1As shown, since the vehicle power consumption is quite different between high-speed and urban driving conditions, the VCU (electric vehicle controller) needs to obtain the vehicle location information from the T-box (vehicle communication terminal) side to switch the mode of the average power consumption calculation of the vehicle driving and low-power functional accessories, and distinguish the remaining range between the urban and high-speed driving conditions. Considering that the vehicle mileage history data is continuously accumulated, the first target mileage can be calculated by the driving distance of the last 50km, and the average power consumption of the vehicle driving and low-power functional accessories needs to be stored in the RAM (random access memory) that will not be lost in the power-off hibernation, so as to be used in the next power-on cycle; the VCU needs to set the initial value of the average power consumption of the vehicle driving and low-power functional accessories (i.e. the first preset power consumption), which is used in the condition of factory or RAM being cleared, and the initial value needs to be obtained through experiments.

[0111] Referring to Figure 2 As shown, the pure electric vehicle driving range estimation method provided by the embodiment of the present application further comprises:

[0112] S20: determining the second average power consumption of the air conditioning system according to the historical power consumption information of the AC (air conditioning system) or the second preset power consumption.

[0113] Referring to Figure 5 As shown, in an optional embodiment of the present application, step S20 comprises:

[0114] S21: intercepting a second preset length of historical driving mileage in the on state of the air conditioning system as a second target driving mileage, and obtaining the second historical current data of the air conditioning system corresponding to the second target driving mileage.

[0115] Referring to Figure 6 As shown, in an optional embodiment of the present application, step S21 comprises:

[0116] S211: intercepting the last second preset length of historical driving mileage in the heating state of the air conditioning system as a heating target driving mileage, and obtaining the historical heating current data of the air conditioning system corresponding to the heating target driving mileage.

[0117] S212: intercepting the last second preset length of historical driving mileage in the refrigeration state of the air conditioning system as a refrigeration target driving mileage, and obtaining the historical refrigeration current data of the air conditioning system corresponding to the refrigeration target driving mileage.

[0118] Referring to Figure 5 As shown, in an optional embodiment of the present application, step S20 further comprises:

[0119] S22: determining a second interval power consumption of the air conditioning system in the second target driving mileage according to the second historical current data.

[0120] As shown in FIG. 2, in an optional embodiment of the present application, step S22 comprises: Figure 6

[0121] S221: determining a heating interval power consumption of the air conditioning system in the heating target driving mileage according to the historical heating current data.

[0122] S222: determining a refrigeration interval power consumption of the air conditioning system in the refrigeration target driving mileage according to the historical refrigeration current data.

[0123] As shown in FIG. 2, in an optional embodiment of the present application, step S20 further comprises: Figure 5

[0124] S23: determining the second average power consumption according to the second interval power consumption and the second target driving mileage.

[0125] As shown in FIG. 2, in an optional embodiment of the present application, step S23 comprises: Figure 6

[0126] S231: determining a heating average power consumption according to the heating interval power consumption and the heating target driving mileage.

[0127] S232: determining a refrigeration average power consumption according to the heating interval power consumption and the heating target driving mileage.

[0128] As shown in FIG. 2, in an optional embodiment of the present application, further comprises the following steps: Figure 7

[0129] S24: obtaining a first average temperature in vehicle, a second average temperature in vehicle and a current temperature in vehicle.

[0130] S241: when the air conditioning system is in a heating state, if a difference between the current temperature in vehicle and the first average temperature in vehicle is greater than a first preset value, determining a second average power consumption of the air conditioning system according to a preset heating power consumption.

[0131] S242: when the air conditioning system is in a refrigeration state, if a difference between the current temperature in vehicle and the second average temperature in vehicle is greater than a second preset value, determining a second average power consumption of the air conditioning system according to a preset refrigeration power consumption.

[0132] The calculation method of the second average power consumption is described in detail as follows in combination with specific embodiments. ​​​​

[0133] The calculation method of the consumed range value of the air conditioning system is similar to the driving system, and the consumed current I of the air conditioning system is AC The integral is performed when the air conditioning is turned on and the vehicle is not in a stationary state, so as to avoid interference of the calculation result caused by the working condition of parking and turning on the air conditioning. Meanwhile, whether the refrigeration or heating is considered when the vehicle owner turns on the air conditioning should be considered, and the processing is classified. Meanwhile, the VCU should identify the working condition of a long-term non-use of the vehicle, etc., which causes a large outdoor temperature difference. At this time, the average power consumption of the air conditioning should be corrected to an initial value, and the initial value is obtained by experiment calibration under different ambient temperatures. The calculation method of the consumed power of the air conditioning system is as follows:

[0134] P AC =∫(I AC )dt;

[0135] P AC is the consumed power of the air conditioning system, and the unit is As. The driving range L is calculated by using the method mentioned in the foregoing description when the air conditioning is turned on AC , and the continuously accumulated historical data should be considered, and the driving range of the last 50 km is used for calculation. Then, the average power consumption AE of the air conditioning system is:

[0136] AE=P AC / L AC ;

[0137] The VCU can store the average power consumption of the air conditioning system in the refrigeration and heating working conditions into the RAM which will not be lost after power-off hibernation, and synchronously record the average outdoor temperature, so as to be used in the next power-on cycle.

[0138] It should be noted that the consumed power of the air conditioning system calculated by the above method is the average power consumption based on the driving range, and the target temperature of the air conditioning system working in the vehicle driving process is not much different from the actual temperature in the vehicle, so the average power consumption of the air conditioning system calculated by the above method is not suitable for the case that the temperature in the vehicle is greatly different from the target temperature when the vehicle is just started. Therefore, the application further provides a supplementary scheme for estimating the power consumption of the air conditioning system when the temperature in the vehicle is greatly different from the target temperature. Specifically, before starting to estimate the power consumption of the air conditioning system, the VCU judges the temperature difference between the recent average temperature stored in the RAM and the actual temperature in the vehicle environment. When the temperature difference is too large, it is considered that the recent average temperature stored in the RAM has no reference value, and the initial value (i.e., the second preset power consumption) is used to estimate the power consumption of the air conditioning system. When the air conditioning system is running and the vehicle is not in a stationary state, the power consumption of the air conditioning system and the driving range of the vehicle are synchronously calculated.

[0139] Please refer to Figure 2 , the pure electric vehicle range estimation method provided by the embodiment of the application further includes:

[0140] S30: obtaining the current remaining available power of the battery pack.

[0141] S40: determining the remaining driving range according to the first average power consumption, the second average power consumption and the remaining available power.

[0142] Referring to Figure 4 in an optional embodiment of the present application, step S40 comprises:

[0143] S41: determining whether the current driving condition is an urban driving condition or a highway driving condition according to the current positioning information.

[0144] S42: when the current driving condition is the urban driving condition, determining the remaining driving range according to the urban average power consumption, the second average power consumption and the remaining available power.

[0145] S43: when the current driving condition is the highway driving condition, determining the remaining driving range according to the highway average power consumption, the second average power consumption and the remaining available power.

[0146] Referring to Figure 6 in an optional embodiment of the present application, step S40 further comprises:

[0147] S44: when the air conditioning system is in the heating state, determining the remaining driving range according to the first average power consumption, the heating average power consumption and the remaining available power.

[0148] S45: when the air conditioning system is in the refrigeration state, determining the remaining driving range according to the first average power consumption, the refrigeration average power consumption and the remaining available power.

[0149] Referring to Figure 2 in an embodiment of the present application, the method for estimating the driving range of the pure electric vehicle further comprises:

[0150] S50: determining the estimated power consumption of the battery heating system according to the current ambient temperature.

[0151] Referring to Figure 8 in an optional embodiment of the present application, step S50 comprises:

[0152] S51: calculating the heat required for heating the battery pack according to the heating target temperature of the battery pack, the average temperature of the current single battery cell, the average specific heat capacity of the battery pack material and the mass of the battery pack.

[0153] S52: calculating the heat required for heating the heating loop according to the condensate target temperature of the heating loop, the actual temperature of the current condensate, the specific heat capacity of the condensate and the mass of the condensate.

[0154] S53: calculating the estimated power consumption of the battery heating system according to the heat required for heating the battery pack, the heat required for heating the heating loop, and the working voltage and energy efficiency conversion ratio of the battery heating system.

[0155] It should be understood that in order to maintain the electronic activity of the high-voltage battery pack, the battery pack is heated and kept warm during winter driving, so that it works in a suitable temperature range. Due to the effect of battery insulation material and battery internal resistance, the energy consumption of the insulation process is not large, so only the power consumption during the heating process needs to be estimated.

[0156] In specific embodiments, the heating target temperature of the high-voltage battery pack is T, the average temperature of the current single cell is T1, the average specific heat capacity of the battery pack material is C1, and the mass is M1; The target temperature of the condensate water of the heating loop is T2, the actual temperature of the current condensate water is T3, the specific heat capacity of the condensate water is C2, and the mass is M2; The unit of the above temperature is ℃, the unit of the specific heat capacity is [J / (kg·℃)], and the unit of the mass is Kg. Then the heat required by the high-voltage battery pack Q1 is, the unit is J:

[0157] Q1=C1*M1*(T-T1);

[0158] The heat required for heating the condensate water of the heating loop Q2, the unit is J:

[0159] Q2=C2*M2*(T2-T3);

[0160] The working voltage of the PackPTC is U, the unit is V, and the predicted power consumption of the high-voltage battery pack heating is P BH , the unit is As, and the energy efficiency conversion ratio is η:

[0161] P BH =(Q1+Q2) / (U*η).

[0162] Please refer to Figure 2 The pure electric vehicle driving range estimation method provided by the embodiments of the present application further comprises:

[0163] S60: determining the driving range consumed by the battery heating system according to the first average power consumption, the second average power consumption, and the estimated power consumption.

[0164] S70: determining the driving range that can be increased by closing the air conditioning system according to the first average power consumption, the second average power consumption, and the remaining available power.

[0165] In specific embodiments, the BMS feedbacks the remaining available power of the high-voltage battery pack as P S , the unit is As; for example, when the battery pack needs to be heated and the air conditioner is turned on:

[0166] The battery preheating predicted consumption mileage F1, unit: m:

[0167] F1=P BH / (DE+AE);

[0168] The remaining driving range F of the vehicle, unit: m:

[0169] F=Ps / (DE +AE);

[0170] The driving range F2 that can be increased by turning off the air conditioner, unit: m:

[0171] F2=(Ps / DE)–F;

[0172] S80: send the remaining driving range, the driving range consumed by the battery heating system, and the driving range that can be increased by turning off the air conditioner system to a visual interactive interface, and the display effect is as shown in Figure 10

[0173] It should be understood that the functions with large vehicle electric energy consumption are driving, air conditioning, and battery pack heating respectively. The present application decouples the three when calculating the vehicle electric consumption, dynamically displays the remaining driving range, estimates the amount of electricity required to heat the battery pack to the target temperature according to the current temperature of the battery pack and the ambient temperature before each use, uses the remaining electricity for driving and air conditioning, and calculates the driving range that can be increased by turning off the air conditioner in real time and visually feeds back to the vehicle owner.

[0174] It should be noted that the step division of the above methods is only for the purpose of clear description, and can be combined into one step or split into multiple steps when implemented, as long as the same logical relationship is included, all within the protection scope of the present patent; adding insignificant modifications or introducing insignificant designs in the algorithm or process, but not changing the core design of the algorithm and process, are within the protection scope of the present application.

[0175] Please refer to Figure 9 ​To achieve the above object and other related objects, the present application also provides a pure electric vehicle driving range estimation device, which comprises a necessary power consumption obtaining module 100, an air conditioner power consumption obtaining module 200, a battery power obtaining module 300 and a driving range estimation module 400. The module mentioned in the present application refers to a series of computer program segments which can be executed by a processor and can complete a fixed function, and is stored in a memory. It should be noted that the pure electric vehicle driving range estimation device of the present embodiment corresponds to the pure electric vehicle driving range estimation method described above, and the functional modules in the pure electric vehicle driving range estimation device correspond to the corresponding steps in the pure electric vehicle driving range estimation method. The pure electric vehicle driving range estimation device of the present embodiment can be implemented in cooperation with the pure electric vehicle driving range estimation method. Accordingly, the related technical details mentioned in the pure electric vehicle driving range estimation device of the present embodiment can also be applied to the pure electric vehicle driving range estimation method described above.

[0176] It should be noted that the above-mentioned functional modules can be integrated into one physical entity or physically separated when actually implemented. These modules can all be implemented in the form of software called by a processing element; they can all be implemented in the form of hardware; or some modules can be implemented in the form of software called by a processing element, and some modules can be implemented in the form of hardware. In addition, these modules can be integrated together or implemented independently. The processing element mentioned herein can be an integrated circuit with signal processing capability. In the implementation process, some or all steps of the above method, or the above functional modules can be completed by the integrated logic circuit of hardware or the instructions of software in the processing element.

[0177] The present application also provides a pure electric vehicle comprising the pure electric vehicle driving range estimation device described above.

[0178] In summary, in the present application, the power consumption of driving, air conditioning and battery pack heating is decoupled when calculating the power consumption of the vehicle, and the remaining driving range is dynamically displayed. Before each use, the amount of power required to heat the battery pack to the target temperature is estimated according to the current temperature of the battery pack and the ambient temperature, the remaining power is used for driving and air conditioning, and the increased driving range when the air conditioner is turned off is calculated in real time and visually fed back to the owner, thereby improving the reliability of the driving range estimation result.

[0179] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

[0180] In the description herein, numerous specific details are provided, such as examples of components and / or methods, to provide a thorough understanding of embodiments of the present application. One skilled in the relevant art will recognize, however, that the application can be practiced without one or more of the specific details, or with other devices, systems, assemblies, methods, components, materials, parts, and / or the like. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail in order to avoid obscuring aspects of embodiments of the present application.

Claims

1. A method for estimating the driving range of a pure electric vehicle, characterized in that, Includes the following steps: Based on the historical power consumption information or the first preset power consumption of the necessary electrical equipment, the first average power consumption of the necessary electrical equipment is determined, wherein the necessary electrical equipment includes at least a drive motor; The second average power consumption of the air conditioning system is determined based on the historical power consumption information of the air conditioning system or the second preset power consumption. Get the current remaining available power of the battery pack; The remaining driving range is determined based on the first average power consumption, the second average power consumption, and the remaining available power. It also includes the following steps: Determine the estimated power consumption of the battery heating system based on the current ambient temperature; The driving range consumed by the battery heating system is determined based on the first average power consumption, the second average power consumption, and the estimated power consumption. The step of determining the estimated power consumption of the battery heating system based on the current ambient temperature includes: Calculate the heat required to raise the temperature of the battery pack based on the target heating temperature of the battery pack, the current average temperature of the individual cells, the average specific heat capacity of the battery pack materials, and the mass of the battery pack. Calculate the heat required to raise the temperature of the heating circuit based on the target temperature of the condensate, the current actual temperature of the condensate, the specific heat capacity of the condensate, and the mass of the condensate. The estimated power consumption of the battery heating system is calculated based on the heat required to heat up the battery pack, the heat required to heat up the heating circuit, and the operating voltage and energy conversion ratio of the battery heating system.

2. The method for estimating the driving range of a pure electric vehicle according to claim 1, characterized in that, It also includes the following steps: Based on the first average power consumption, the second average power consumption, and the remaining available power, determine the additional driving range that can be increased by turning off the air conditioning system.

3. The method for estimating the driving range of a pure electric vehicle according to claim 2, characterized in that, It also includes the following steps: The remaining driving range, the driving range consumed by the battery heating system, and the driving range that can be increased by turning off the air conditioning system are sent to the visual interactive interface.

4. The method for estimating the driving range of a pure electric vehicle according to claim 1, characterized in that, The step of determining the first average power consumption of the necessary electrical equipment based on its historical power consumption information includes: Extract a first preset length of the historical driving mileage from the historical driving mileage as the first target driving mileage, and obtain the first historical current data of the necessary electrical equipment corresponding to the first target driving mileage; Based on the first historical current data, determine the power consumption of the necessary electrical equipment in the first interval within the first target driving mileage; Based on the first target driving mileage and the first interval power consumption, the first average power consumption of the necessary electrical equipment is determined.

5. The method for estimating the driving range of a pure electric vehicle according to claim 4, characterized in that, The step of extracting a first preset length of the historical mileage from the historical mileage as the first target mileage, and obtaining the first historical current data of the necessary electrical equipment corresponding to the first target mileage includes: The historical mileage is marked based on historical location data to determine the historical mileage in urban areas and the historical mileage on highways; The most recent segment of the historical urban driving mileage of the first preset length is extracted as the target urban driving mileage, and the historical urban current data of the necessary electrical equipment corresponding to the target urban driving mileage is obtained. The most recent segment of the high-speed historical driving mileage of the first preset length is extracted as the high-speed target driving mileage, and the high-speed historical current data of the necessary electrical equipment corresponding to the high-speed target driving mileage is obtained.

6. The method for estimating the driving range of a pure electric vehicle according to claim 5, characterized in that, The step of determining the power consumption of the necessary electrical equipment in the first interval within the first target driving mileage based on the first historical current data includes: Based on the historical current data of the urban area, determine the power consumption of the necessary electrical equipment in the urban area within the target driving distance of the urban area; Based on the high-speed historical current data, the power consumption of the necessary electrical equipment in the high-speed section within the target high-speed driving mileage is determined.

7. The method for estimating the driving range of a pure electric vehicle according to claim 6, characterized in that, The step of determining the first average power consumption of the necessary electrical equipment based on the first target driving mileage and the first interval power consumption includes: The average urban power consumption of the necessary electrical equipment is determined based on the target driving mileage in the urban area and the power consumption in the urban area. The average high-speed power consumption of the necessary electrical equipment is determined based on the target high-speed driving mileage and the power consumption in the high-speed section.

8. The method for estimating the driving range of a pure electric vehicle according to claim 7, characterized in that, The step of determining the remaining driving range based on the first average power consumption, the second average power consumption, and the remaining available power includes: Based on the current location information, determine whether the current operating conditions are urban or highway. When the current driving condition is urban, the remaining driving range is determined based on the average urban power consumption, the second average power consumption, and the remaining available power. When the current operating condition is high speed, the remaining driving range is determined based on the high speed average power consumption, the second average power consumption, and the remaining available power.

9. The method for estimating the driving range of a pure electric vehicle according to claim 1, characterized in that, The step of determining the second average power consumption of the air conditioning system based on its historical power consumption information includes: Extract a second preset length of historical mileage from the historical mileage with the air conditioning system in the on state as the second target mileage, and obtain the second historical current data of the air conditioning system corresponding to the second target mileage; Based on the second historical current data, determine the power consumption of the air conditioning system in the second interval within the second target driving mileage; The second average energy consumption is determined based on the energy consumption in the second interval and the second target driving mileage.

10. The method for estimating the driving range of a pure electric vehicle according to claim 9, characterized in that, The step of extracting a second preset length of historical mileage from the historical mileage with the air conditioning system on as the second target mileage, and obtaining the second historical current data of the air conditioning system corresponding to the second target mileage, includes: The most recent historical driving mileage of the air conditioning system in heating state is extracted as the heating target driving mileage, and the historical heating current data of the air conditioning system corresponding to the heating target driving mileage is obtained. The most recent historical driving mileage of the air conditioning system in cooling mode is extracted as the target driving mileage for cooling, and the historical cooling current data of the air conditioning system corresponding to the target driving mileage for cooling is obtained.

11. The method for estimating the driving range of a pure electric vehicle according to claim 10, characterized in that, The step of determining the power consumption of the air conditioning system in the second interval within the second target driving mileage based on the second historical current data includes: Based on the historical heating current data, the power consumption of the air conditioning system within the heating range of the target driving mileage is determined; Based on the historical cooling current data, the power consumption of the air conditioning system within the cooling range of the target mileage is determined.

12. The method for estimating the driving range of a pure electric vehicle according to claim 11, characterized in that, The step of determining the second average energy consumption based on the second interval energy consumption and the second target driving mileage includes: The average heating power consumption is determined based on the power consumption of the heating zone and the target driving mileage for heating. The average power consumption for cooling is determined based on the power consumption of the heating zone and the target driving mileage for heating.

13. The method for estimating the driving range of a pure electric vehicle according to claim 12, characterized in that, The step of determining the remaining driving range based on the first average power consumption, the second average power consumption, and the remaining available power includes: When the air conditioning system is in heating mode, the remaining driving range is determined based on the first average power consumption, the average heating power consumption, and the remaining available power. When the air conditioning system is currently in cooling mode, the remaining driving range is determined based on the first average power consumption, the average cooling power consumption, and the remaining available power.

14. The method for estimating the driving range of a pure electric vehicle according to claim 10, characterized in that, It also includes the following steps: The first average interior temperature within the target heating mileage, the second average interior temperature within the target cooling mileage, and the current interior temperature are obtained. When the air conditioning system is in heating mode, if the difference between the current vehicle interior temperature and the first average vehicle interior temperature is greater than a first preset value, then the second average power consumption of the air conditioning system is determined based on the preset heating power consumption. When the air conditioning system is in cooling mode, if the difference between the current vehicle interior temperature and the second average vehicle interior temperature is greater than a second preset value, then the second average power consumption of the air conditioning system is determined based on the preset cooling power consumption.

15. A device for predicting the driving range of a pure electric vehicle, characterized in that, include: The necessary power consumption acquisition module is used to determine the first average power consumption of the necessary power equipment based on the historical power consumption information or the first preset power consumption of the necessary power equipment, wherein the necessary power equipment includes at least a drive motor. An air conditioning power consumption acquisition module is used to determine the second average power consumption of the air conditioning system based on the historical power consumption information of the air conditioning system or a second preset power consumption. The battery power acquisition module is used to obtain the current remaining available power of the battery pack; The driving range estimation module is used to determine the remaining driving range based on the first average power consumption, the second average power consumption, and the remaining available power. The pure electric vehicle range estimation device is also configured to perform the following steps: Determine the estimated power consumption of the battery heating system based on the current ambient temperature; The driving range consumed by the battery heating system is determined based on the first average power consumption, the second average power consumption, and the estimated power consumption. The step of determining the estimated power consumption of the battery heating system based on the current ambient temperature includes: Calculate the heat required to raise the temperature of the battery pack based on the target heating temperature of the battery pack, the current average temperature of the individual cells, the average specific heat capacity of the battery pack materials, and the mass of the battery pack. Calculate the heat required to raise the temperature of the heating circuit based on the target temperature of the condensate, the current actual temperature of the condensate, the specific heat capacity of the condensate, and the mass of the condensate. The estimated power consumption of the battery heating system is calculated based on the heat required to heat up the battery pack, the heat required to heat up the heating circuit, and the operating voltage and energy conversion ratio of the battery heating system.

16. A pure electric vehicle, characterized in that, Includes the pure electric vehicle range estimation device as described in claim 15.

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