A road-based high and low temperature driving range test method and device for electric vehicles

Abstract

A road-based high- and low-temperature driving range test method and device for electric vehicles. The method includes: determining the maximum discharge capacity E, the air conditioning initial setup phase power consumption test E1, the constant speed power consumption EC1, and the variable speed power consumption EC2 based on the vehicle's maximum discharge capacity during driving at high and low temperatures, the air conditioning initial setup phase power consumption test, the constant speed power consumption test, and the variable speed power consumption test; determining the vehicle's driving range at a constant speed under high and low temperatures based on E, E1, and EC1; and determining the vehicle's driving range under variable speed under high and low temperatures based on E, E1, and EC2. This application improves the consistency and comparability of high and low temperature road driving range test results and more accurately represents the vehicle's true driving range.

Description

Technical Field

[0001] The present application relates to the field of vehicle testing technology, and in particular to a road-based high and low temperature driving range testing method, device, equipment and computer-readable storage medium for electric vehicles. Background Art

[0002] Compared with the simulation test method based on chassis dynamometer and environmental chamber, conducting new energy vehicle range test on the road can more realistically reflect the vehicle's driving resistance and the energy transfer and loss of the entire vehicle.

[0003] However, actual road driving range is affected by multiple factors, including driving speed, altitude, temperature, wind speed, road slope / adhesion, vehicle load, driving mode, air conditioning settings, SOC, and battery health. This results in significant variability in test results, making them unable to fully reflect a vehicle's true range and preventing horizontal comparison. Summary of the Invention

[0004] The present application provides a road-based electric vehicle high and low temperature driving range test method, device, equipment and computer-readable storage medium, which can solve the technical problems existing in the prior art such as poor consistency and comparability of test results, inability to conduct horizontal comparison and characterize the vehicle's actual driving range level.

[0005] In a first aspect, an embodiment of the present application provides a road-based high and low temperature driving range test method for electric vehicles, the road-based high and low temperature driving range test method for electric vehicles comprising:

[0006] Based on the maximum discharge capacity test of the vehicle under test at high and low temperatures and the power consumption test during the initial setting of the air conditioner, the maximum discharge capacity E of the power battery of the vehicle under test at high and low temperatures and the power consumption E1 during the initial setting of the air conditioner are determined;

[0007] Based on the constant speed operating condition power consumption test of the vehicle to be tested at high and low temperatures, the constant speed operating condition power consumption EC1 of the vehicle to be tested is determined;

[0008] Determine the speed-shifting power consumption EC2 of the vehicle under test based on speed-shifting power consumption tests conducted on the vehicle under test at high and low temperatures;

[0009] Substitute E, E1, and EC1 into the first formula to determine the range of the vehicle under test when traveling at a constant speed under high and low temperatures. The first formula is:

[0010]

[0011] Substitute E, E1, and EC2 into the second formula to determine the driving range of the vehicle under test when driving at variable speeds under high and low temperatures. The second formula is:

[0012]

[0013] R const_speed R is the driving range of the vehicle under test when it is running at a constant speed under high and low temperature conditions. cycle_speed It is the driving range of the vehicle under test when driving at variable speeds under high and low temperatures.

[0014] In conjunction with the first aspect, in one embodiment, the step of determining the speed-shifting operating condition power consumption EC2 of the vehicle to be tested based on the speed-shifting operating condition power consumption test performed on the vehicle to be tested at high and low temperatures includes:

[0015] Based on the power consumption test of the vehicle under test under the speed change condition at high and low temperatures, sampling data at each sampling moment during the power consumption test under the speed change condition is obtained, and the sampling data includes speed value, acceleration value and power battery power;

[0016] If the speed and acceleration included in the sampled data are within the effective speed-acceleration subinterval of the CLTC-P standard operating condition, the sampled data are placed in a data set corresponding to the effective speed-acceleration subinterval of the CLTC-P standard operating condition until the number of sampled data in the data sets corresponding to the effective speed-acceleration subintervals of all CLTC-P standard operating conditions is greater than a preset value, wherein the effective speed-acceleration subinterval of the CLTC-P standard operating condition corresponds to a speed range and an acceleration range;

[0017] For each data set, the speed values ​​contained in the data set are summed to obtain the total mileage, and the power battery power values ​​contained in the data set are summed to obtain the total power battery energy consumption;

[0018] Based on the total mileage and total battery energy consumption corresponding to each data set, the power consumption corresponding to each data set is obtained;

[0019] The power consumption corresponding to all data sets is integrated to obtain the power consumption EC2 of the speed change condition of the vehicle under test.

[0020] In conjunction with the first aspect, in one embodiment, the sampled data further includes low-voltage accessory power, high-voltage accessory power, and motor controller power. Before the steps of integrally summing the speed values ​​contained in each data set to obtain the total mileage, and integrally summing the power battery power contained in the data set to obtain the total power battery energy consumption, the steps further include:

[0021] For each data set, delete the sampled data corresponding to the maximum and minimum values ​​of the low-voltage accessory power, delete the sampled data corresponding to the maximum and minimum values ​​of the high-voltage accessory power, and delete the sampled data corresponding to the maximum and minimum values ​​of the motor controller power.

[0022] In conjunction with the first aspect, in one embodiment, the step of synthesizing the power consumption corresponding to all data sets to obtain the power consumption EC2 of the vehicle under test in the gear shifting condition includes:

[0023] The power consumption corresponding to all data sets is weightedly summed to obtain the power consumption EC2 of the power battery of the vehicle under test under the speed change condition.

[0024] In combination with the first aspect, in one embodiment, for any dataset D i , dataset D i The corresponding weight R i Determined by the weight calculation formula, the weight calculation formula is:

[0025]

[0026] Where C is the total number of landing points under CLTC-P standard working condition, 1800, m i The second-by-second speed-acceleration of the CLTC-P standard working condition in the data set D i The number of landing points in the effective speed-acceleration sub-interval of the corresponding CLTC-P standard working condition.

[0027] In a second aspect, an embodiment of the present application provides a road-based high and low temperature driving range test device for electric vehicles, the road-based high and low temperature driving range test device for electric vehicles comprising:

[0028] A first determination module is configured to determine a maximum discharge capacity E of the power battery of the vehicle under test during driving at high and low temperatures and a power consumption E1 during the initial setting of the air conditioner based on a maximum discharge capacity test of the vehicle under test during driving at high and low temperatures and a power consumption test during the initial setting of the air conditioner.

[0029] The second determining module is configured to determine the constant speed operating condition power consumption EC1 of the vehicle to be tested based on a constant speed operating condition power consumption test of the vehicle to be tested at high and low temperatures;

[0030] A third determining module is configured to determine a speed-shifting operating condition power consumption EC2 of the vehicle under test based on a speed-shifting operating condition power consumption test conducted on the vehicle under test at high and low temperatures;

[0031] The fourth determination module is used to substitute E, E1, and EC1 into the first formula to determine the driving range of the vehicle under test when traveling at a constant speed under high and low temperatures. The first formula is:

[0032]

[0033] The fifth determination module is used to substitute E, E1, and EC2 into the second formula to determine the driving range of the vehicle under test when the vehicle is driving at variable speeds under high and low temperatures. The second formula is:

[0034]

[0035] R const_speed R is the driving range of the vehicle under test when it is running at a constant speed under high and low temperature conditions. cycle_speed It is the driving range of the vehicle under test when driving at variable speeds under high and low temperatures.

[0036] In conjunction with the second aspect, in one implementation, the third determining module is configured to:

[0037] Based on the power consumption test of the vehicle under test under the speed change condition at high and low temperatures, sampling data at each sampling moment during the power consumption test under the speed change condition is obtained, and the sampling data includes speed value, acceleration value and power battery power;

[0038] If the speed and acceleration included in the sampled data are within the effective speed-acceleration subinterval of the CLTC-P standard operating condition, the sampled data are placed in a data set corresponding to the effective speed-acceleration subinterval of the CLTC-P standard operating condition until the number of sampled data in the data sets corresponding to the effective speed-acceleration subintervals of all CLTC-P standard operating conditions is greater than a preset value, wherein the effective speed-acceleration subinterval of the CLTC-P standard operating condition corresponds to a speed range and an acceleration range;

[0039] For each data set, the speed values ​​contained in the data set are summed to obtain the total mileage, and the power battery power values ​​contained in the data set are summed to obtain the total power battery energy consumption;

[0040] Based on the total mileage and total battery energy consumption corresponding to each data set, the power consumption corresponding to each data set is obtained;

[0041] The power consumption corresponding to all data sets is integrated to obtain the power consumption EC2 of the speed change condition of the vehicle under test.

[0042] In conjunction with the second aspect, in one embodiment, the sampled data further includes low-voltage accessory power, high-voltage accessory power, and motor controller power, and the road-based electric vehicle high and low temperature driving range test device further includes a deletion module for:

[0043] For each data set, delete the sampled data corresponding to the maximum and minimum values ​​of the low-voltage accessory power, delete the sampled data corresponding to the maximum and minimum values ​​of the high-voltage accessory power, and delete the sampled data corresponding to the maximum and minimum values ​​of the motor controller power.

[0044] In a third aspect, an embodiment of the present application provides a road-based electric vehicle high- and low-temperature driving range test device, wherein the road-based electric vehicle high- and low-temperature driving range test device includes a processor, a memory, and a road-based electric vehicle high- and low-temperature driving range test program stored on the memory and executable by the processor, wherein when the road-based electric vehicle high- and low-temperature driving range test program is executed by the processor, the steps of the road-based electric vehicle high- and low-temperature driving range test method as described in the first aspect are implemented.

[0045] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a road-based electric vehicle high and low temperature driving range test program is stored. When the road-based electric vehicle high and low temperature driving range test program is executed by a processor, the steps of the road-based electric vehicle high and low temperature driving range test method as described in the first aspect are implemented.

[0046] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0047] In the embodiment of the present application, based on the maximum discharge capacity test and the power consumption test of the air conditioning initial setting stage conducted on the vehicle under test at high and low temperatures, the maximum discharge capacity E of the power battery of the vehicle under test under high and low temperature conditions and the power consumption E1 of the air conditioning initial setting stage are determined; based on the constant speed working condition power consumption test conducted on the vehicle under test under high and low temperatures, the constant speed working condition power consumption EC1 of the vehicle under test is determined; based on the variable speed working condition power consumption test conducted on the vehicle under test under high and low temperatures, the variable speed working condition power consumption EC2 of the vehicle under test is determined; E, E1, and EC1 are substituted into the first formula to determine the driving range of the vehicle under test under high and low temperature conditions when driving at a constant speed; E, E1, and EC2 are substituted into the second formula to determine the driving range of the vehicle under test under variable speed conditions. Through the embodiment of the present application, the test conditions and boundaries are unified and constrained, the consistency and comparability of the road driving range test results are improved, and the vehicle driving range obtained through the test is more consistent with the vehicle's actual driving range level. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a flow chart of an embodiment of a road-based high and low temperature driving range test method for electric vehicles of the present application;

[0049] Figure 2 For this application Figure 1 Detailed flow chart of step S30;

[0050] Figure 3 This is a functional module diagram of an embodiment of a road-based high and low temperature driving range test device for electric vehicles of the present application;

[0051] Figure 4 This is a schematic diagram of the hardware structure of the road-based electric vehicle high and low temperature driving range test equipment involved in the embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0054] In a first aspect, an embodiment of the present application provides a road-based high and low temperature driving range test method for electric vehicles.

[0055] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of a road-based electric vehicle high and low temperature driving range test method. Figure 1 As shown in the figure, the road-based high and low temperature driving range test method for electric vehicles includes:

[0056] Step S10, determining the maximum discharge capacity E of the power battery of the vehicle under test during driving at high and low temperatures and the power consumption E1 during the initial setting of the air conditioner based on the maximum discharge capacity test during driving at high and low temperatures and the power consumption test during the initial setting of the air conditioner performed on the vehicle under test;

[0057] In this embodiment, before performing the maximum discharge capacity test, the constant speed condition power consumption test, and the variable speed condition power consumption test on the vehicle under test at high and low temperatures, the vehicle under test must meet the following requirements:

[0058] The mileage of the vehicle to be tested is greater than 500km;

[0059] The power battery of the vehicle under test has completed at least one complete charge and discharge;

[0060] The state of available energy (SOCE) of the power battery of the vehicle under test is greater than 98%;

[0061] The air conditioning system of the vehicle to be tested has been maintained and is working properly.

[0062] Secondly, during the test of the maximum discharge capacity of the vehicle under test, the constant speed power consumption test, and the variable speed power consumption test at high and low temperatures, the following requirements are placed on the test environment and site:

[0063] Among them, high and low temperature are divided into high temperature and low temperature. If it is low temperature, the ambient temperature during the test is between (-7±3)℃; if it is high temperature, the ambient temperature during the test is between (35±3)℃, the relative humidity is between 40% and 60%, and the light intensity is between (850±100)w / m^2;

[0064] During the entire test, the average wind speed over 5 seconds was less than 2 m / s, and the peak wind speed over 2 seconds was less than 4 m / s;

[0065] The altitude of the test site shall not exceed 500m;

[0066] The test site's roads should be flat, clean, and dry, and their geological composition should be representative of typical urban and highway pavement. The longitudinal slope of the road should not exceed ±1%, and the slope difference within any 3m section of the test road should not exceed 0.5%.

[0067] Secondly, before conducting the maximum discharge capacity test, constant speed power consumption test, and variable speed power consumption test on the vehicle under test at high and low temperatures, the following preparations must be made:

[0068] Current sensors and voltage sensors are placed on the power battery busbar, electric machine controller, DCDC output terminal, electric compressor EAC, and electric heater PTC of the vehicle under test. A GPS speed sensor and acceleration sensor are installed on the top of the vehicle under test. Temperature sensors are installed at the driver and co-driver head positions in the passenger compartment of the vehicle under test. These sensors are connected to data acquisition equipment to synchronize the data collected by each sensor during the test with the relevant data on the vehicle CAN.

[0069] Adjust the vehicle's tire pressure in accordance with relevant requirements and load the vehicle. The difference between the loaded vehicle mass (including test equipment and personnel) and the test mass required by the standard is within 25kg.

[0070] Arrange an ambient temperature and wind speed test weather station at a certain height beside the test road.

[0071] The maximum discharge capacity and power consumption during the initial air conditioning setting phase of the vehicle under test were tested at high and low temperatures as follows:

[0072] Fully charge the vehicle in accordance with relevant requirements;

[0073] Vehicle immersion: When the high and low temperature is low, immerse the vehicle to be tested in the vehicle environmental chamber for 12 to 36 hours, and the temperature in the vehicle environmental chamber is between (-7±3)℃; when the high and low temperature is high, immerse the vehicle to be tested in the vehicle environmental chamber for 1 hour, and the temperature in the vehicle environmental chamber is between (35±3)℃, the relative humidity is between 40% and 60%, and the light intensity is between (850±100)w / m^2.

[0074] After meeting the above requirements, first conduct the power consumption test during the initial setting phase of the air conditioner:

[0075] First, turn on the air conditioning of the vehicle under test. When the high and low temperatures are low, turn on the air conditioning heating mode, set the air conditioning mode to external circulation and blowing feet, and set the initial air conditioning temperature to the highest setting, so that the temperature of the driver and co-driver heads in the passenger compartment quickly reaches 20°C. Then adjust the air conditioning temperature setting so that the temperature of the driver and co-driver heads in the range of (19-23)°C is maintained stable for 5 minutes. When the high and low temperatures are high, turn on the air conditioning cooling mode, set the air conditioning mode to internal circulation and blowing faces, and set the initial air conditioning temperature to the lowest setting, so that the temperature of the driver and co-driver heads in the passenger compartment quickly reaches 25°C. Then adjust the air conditioning temperature setting so that the temperature of the driver and co-driver heads in the range of (22-26)°C is maintained stable for 5 minutes before stopping the test. During the initial air conditioning setting stage, real-time data such as the current and voltage of the power battery busbar are collected and integrated to obtain the power consumption E1 corresponding to the initial air conditioning setting stage.

[0076] Then move to the test site, the vehicle to be tested is first accelerated to 100km / h, and then driven on the test site road at a constant speed of 100±2km / h until the speed can no longer be maintained at 90km / h, at which time the test is stopped.

[0077] The test starts with the vehicle under test turning on the air conditioner in the vehicle environmental chamber and ends with the maximum discharge capacity test. The current I and voltage U of the power battery bus are collected in real time, and the maximum discharge capacity E of the power battery of the vehicle under test under high and low temperature conditions is calculated according to the following formula:

[0078]

[0079] Among them, t0 is the time when the air conditioner of the vehicle under test is turned on in the vehicle environment chamber, t end This is the end time of the maximum discharge capacity test conducted on the vehicle under test at high and low temperatures.

[0080] It is easy to understand that the specific numerical values ​​listed in the above and following descriptions are only illustrative descriptions, intended to enable readers to more clearly understand the embodiments of the present application, and do not constitute a limitation on the embodiments of the present application.

[0081] Step S20, determining the constant speed operating condition power consumption EC1 of the vehicle to be tested based on the constant speed operating condition power consumption test performed on the vehicle to be tested at high and low temperatures;

[0082] In this embodiment, the constant speed power consumption test of the vehicle to be tested is carried out at high and low temperatures as follows:

[0083] First, perform the initial settings of the air conditioner in the parking state according to the setting method of the air conditioner in the initial setting stage of the air conditioner mentioned above. Then move the vehicle to the test site to start the constant speed power consumption test. Then complete the power consumption test under each constant speed working condition according to the set constant speed and time requirements. For example, first accelerate to a constant speed of 60km / h, and drive on the road of the test site at a constant speed of 60±2km / h. After maintaining the constant speed for 30 minutes, stop the test. During the low-temperature constant-speed power consumption test, the temperature of the driver and co-driver's heads is within the range of (19-23)℃. During the high-temperature constant-speed power consumption test, the temperature of the driver and co-driver's heads is within the range of (22-26)℃.

[0084] During the constant speed power consumption test phase, the current, voltage and other data of the power battery busbar are collected in real time, and the constant speed power consumption EC1 of the power battery of the vehicle to be tested is calculated according to the following formula:

[0085]

[0086] Among them, based on the constant speed working condition power consumption test phase, the current and voltage of the power battery busbar are collected in real time, and E is calculated by referring to the formula for calculating E. const_speed ;D const_speed It is the total mileage of the vehicle under test in the constant speed power consumption test.

[0087] Step S30, determining the speed-shifting power consumption EC2 of the vehicle to be tested based on the speed-shifting power consumption test performed on the vehicle to be tested at high and low temperatures;

[0088] In this embodiment, the power consumption test of the vehicle under test under the gear shifting condition at high and low temperatures is as follows:

[0089] Adjust the power level of the vehicle under test to be able to complete the entire speed-shifting power consumption test, but not to exceed 90% of the total SOC; set the driving mode and brake energy recovery mode of the vehicle under test in accordance with relevant standards. First, perform the initial settings of the air conditioner in the parking state according to the setting method of the air conditioner initial setting stage. This part refers to the above description and is not repeated here. Then, control the vehicle to change speeds on the test site road, and determine the speed-shifting power consumption EC2 of the power battery of the vehicle under test based on the data collected in real time by the sensors during the test. During the low-temperature speed-shifting power consumption test, the head temperature of the driver and co-driver is kept within the range of (19-23)°C. During the high-temperature speed-shifting power consumption test, the head temperature of the driver and co-driver is kept within the range of (22-26)°C.

[0090] Furthermore, in one embodiment, the step of determining the speed-shifting operating condition power consumption EC2 of the vehicle to be tested based on the speed-shifting operating condition power consumption test performed on the vehicle to be tested at high and low temperatures includes:

[0091] Step S301, based on a speed-changing power consumption test conducted on the vehicle under test at high and low temperatures, obtaining sampling data at each sampling moment during the speed-changing power consumption test, the sampling data including speed value, acceleration value, and power battery power;

[0092] In this embodiment, during the power consumption test under the speed-changing condition, the speed value, acceleration value and power battery power of the vehicle to be tested are sampled in real time, so that the sampling data at each sampling moment can be obtained.

[0093] Step S302: If the speed and acceleration included in the sampled data are within the effective speed-acceleration subinterval of the CLTC-P standard operating condition, the sampled data is placed into a data set corresponding to the effective speed-acceleration subinterval of the CLTC-P standard operating condition until the number of sampled data in the data sets corresponding to the effective speed-acceleration subintervals of all CLTC-P standard operating conditions exceeds a preset value, wherein the effective speed-acceleration subinterval of the CLTC-P standard operating condition corresponds to a speed range and an acceleration range.

[0094] In this embodiment, the effective speed-acceleration sub-intervals of the CLTC-P standard operating condition are determined as follows: the speed sub-intervals are divided into intervals of 2 km / h in the speed range of 0-116 km / h, and the acceleration sub-intervals are divided into intervals of 0.1 m / s^2 in the speed range of -2.0-2.0 m / s^2. Each speed sub-interval and acceleration sub-interval constitutes a preliminary sub-interval of the VA distribution, and the preliminary sub-interval of the VA distribution is defined as ([v1, v2], [a1, a2]).

[0095] The VA of the CLTC-P standard working condition is counted second by second. When the VA meets the following requirements:

[0096] v1≤v<v2 and a1≤a<a2, then ([v1, v2], [a1, a2]) is a valid velocity-acceleration sub-interval of the CLTC-P standard working condition.

[0097] Based on this, the sampled data can be placed into the data set corresponding to the effective speed-acceleration sub-interval of the corresponding CLTC-P standard working condition.

[0098] Assuming there are 100 valid speed-acceleration subranges for the CLTC-P standard operating condition, subsequent actions are performed only when the number of sampled data in the 100 data sets corresponding to all 100 valid speed-acceleration subranges exceeds a preset value, thereby ensuring consistency and comparability of road driving range test results. The preset value is set according to actual needs, for example, 12.

[0099] Step S303 , for each data set, summing the integrals of the speed values ​​contained in the data set to obtain a total mileage, and summing the integrals of the power battery power contained in the data set to obtain a total power battery energy consumption;

[0100] In this embodiment, referring to the above description, for a data set, if 15 sampled data are put into the data set, then the data set contains 15 speed values ​​and 15 power battery powers. Then, the 15 speed values ​​are integrated and summed to obtain the total mileage; the 15 power battery powers are summed to obtain the total power battery power. Similarly, the total mileage and total power battery power corresponding to each data set can be obtained. Specifically, the total mileage d of data set k can be calculated using the following formula: array , k And the total energy consumption of the power battery E array , k :

[0101]

[0102] The data set k contains j mileages, i.e. d1 to d j , 1 / 1000 is used for unit conversion.

[0103]

[0104] Among them, the data set k contains j power batteries, that is, P hv,1 To P hv,j , 1 / 3600 is used for unit conversion.

[0105] Mileage i And the power battery power P hv , i Calculated by the following formula:

[0106]

[0107] Among them, v i is the speed at sampling time i, v i-1 is the velocity at the previous sampling moment, v i is the timestamp of sampling time i, t i-1 The timestamp of the previous sampling moment.

[0108] P hv , i =U hv , i ×I hv , i

[0109] Among them, U hv , i is the voltage of the power battery bus corresponding to the sampling time i, in V, I hv , i is the current of the power battery bus corresponding to the sampling time i, in A.

[0110] Furthermore, in one embodiment, the sampled data also includes low-voltage accessory power, high-voltage accessory power, and motor controller power. Before step S303, the following is also included:

[0111] For each data set, delete the sampled data corresponding to the maximum and minimum values ​​of the low-voltage accessory power, delete the sampled data corresponding to the maximum and minimum values ​​of the high-voltage accessory power, and delete the sampled data corresponding to the maximum and minimum values ​​of the motor controller power.

[0112] In this embodiment, the low-voltage accessory power P at sampling time i during the power consumption test under variable speed condition is lv,i , high voltage accessory power P hv,i And the motor controller power P dm,i Calculated by the following formula:

[0113] P lv,i =U lv,i ×I lv,i

[0114] Among them, U lv,i The voltage of the low-voltage accessory corresponding to the sampling time i, generally the voltage output by the DCDC, unit V; I lv,i The total current consumed by the low-voltage accessories corresponding to the sampling time i, generally the current output by the DC-DC converter, in A.

[0115] P hv,i =U PTC,i ×I PTC,i +U EAC,i ×IEAC,i

[0116] Among them, U PTC,i is the voltage of the electric heater corresponding to the sampling time i, in V; I PTC,i is the current of the electric heater corresponding to the sampling time i, unit is A; U EAC,i is the voltage of the electric compressor corresponding to the sampling time i, in V; I EAC,i is the current of the electric compressor corresponding to the sampling time i, in A.

[0117] P dm,i =U dm,i ×I dm,i

[0118] Among them, U dm,i is the voltage of the motor controller bus corresponding to the sampling time i, in V; I dm,i is the current of the motor controller bus corresponding to the sampling time i, in A.

[0119] For each data set, by deleting the sampling data corresponding to the maximum value of low-voltage accessory power, the sampling data corresponding to the minimum value of low-voltage accessory power, the sampling data corresponding to the maximum value of high-voltage accessory power, the sampling data corresponding to the minimum value of high-voltage accessory power, the sampling data corresponding to the maximum value of motor controller power, and the sampling data corresponding to the minimum value of motor controller power in the data set, the interference of these sampling data on the final result can be reduced.

[0120] Step S304, obtaining the power consumption corresponding to each data set based on the total mileage and the total power battery energy consumption corresponding to each data set;

[0121] In this embodiment, the power consumption EC corresponding to the data set k is array,k Calculated by the following formula:

[0122]

[0123] By analogy, the power consumption corresponding to each data set can be obtained.

[0124] Step S305 , combining the power consumption corresponding to all data sets to obtain the power consumption EC2 of the speed change condition of the vehicle to be tested.

[0125] In this embodiment, based on the power consumption corresponding to all data sets, the power consumption EC2 of the power battery of the vehicle to be tested under the speed change condition can be obtained through a specific calculation method (such as averaging).

[0126] Furthermore, in one embodiment, step S305 includes:

[0127] The power consumption corresponding to all data sets is weightedly summed to obtain the power consumption EC2 of the power battery of the vehicle under test under the speed change condition.

[0128] In this embodiment, the weighted sum of the power consumption corresponding to all data sets is calculated according to the following formula:

[0129]

[0130] Where n is the number of data sets, R array,k is the weight of the dataset k.

[0131] It should be noted that any data set k corresponds to a va interval. Therefore, the weight corresponding to each va interval can be set in advance based on the specific value of each va interval and used as the weight of the corresponding data set k.

[0132] Furthermore, in one embodiment, for any data set D i , dataset D i The corresponding weight R i Determined by the weight calculation formula, the weight calculation formula is:

[0133]

[0134] Where C is the total number of landing points under CLTC-P standard working condition, 1800, m i The second-by-second speed-acceleration of the CLTC-P standard working condition in the data set D i The number of landing points in the effective speed-acceleration sub-interval of the corresponding CLTC-P standard working condition.

[0135] In this embodiment, under the CLTC-P standard operating condition, a set of speeds and accelerations falls within a valid speed-acceleration sub-interval, that is, each valid speed-acceleration sub-interval has a corresponding landing point number, and the sum of the landing point numbers corresponding to all valid speed-acceleration sub-intervals is the total landing point number C of the CLTC-P standard operating condition.

[0136] For example, the second-by-second speed-acceleration of the CLTC-P standard condition is in the dataset D i The number of points in the corresponding effective velocity-acceleration subinterval is 18, so the data set D i The corresponding weight R i is 0.01.

[0137] By analogy, the weight corresponding to each data set can be determined.

[0138] Step S40: Substitute E, E1, and EC1 into the first formula to determine the driving range of the vehicle under test when traveling at a constant speed under high and low temperatures. The first formula is:

[0139]

[0140] Step S50: Substitute E, E1, and EC2 into a second formula to determine the mileage of the vehicle under test when driving at variable speeds under high and low temperatures. The second formula is:

[0141]

[0142] R const_speed R is the driving range of the vehicle under test when it is running at a constant speed under high and low temperature conditions. cycle_speed It is the driving range of the vehicle under test when driving at variable speeds under high and low temperatures.

[0143] In the embodiment of the present application, based on the maximum discharge capacity test and the power consumption test during the initial setting phase of the air conditioner conducted on the vehicle under test at high and low temperatures, the maximum discharge capacity E of the power battery of the vehicle under test under high and low temperature conditions and the power consumption E1 during the initial setting phase of the air conditioner are determined; based on the power consumption test under constant speed conditions conducted on the vehicle under test under high and low temperatures, the power consumption EC1 of the vehicle under test under constant speed conditions is determined; based on the power consumption test under variable speed conditions conducted on the vehicle under test under high and low temperatures, the power consumption EC2 of the vehicle under test under variable speed conditions is determined; E, E1, and EC1 are substituted into the first formula to determine the driving range of the vehicle under test under constant speed conditions at high and low temperatures; E, E1, and EC2 are substituted into the second formula to determine the driving range of the vehicle under test under variable speed conditions at high and low temperatures. Through the embodiment of the present application, the test conditions and boundaries are unified and constrained, the consistency and comparability of the road driving range test results are improved, and based on the VA distribution and power consumption weight of the CLTC-P standard operating condition, the vehicle driving range obtained through the test is more consistent with the vehicle's actual driving range level.

[0144] In a second aspect, an embodiment of the present application also provides a road-based high and low temperature driving range testing device for electric vehicles.

[0145] In one embodiment, referring to Figure 3 , Figure 3 This is a functional module diagram of an embodiment of a road-based electric vehicle high and low temperature driving range test device. Figure 3 As shown in the figure, the road-based high and low temperature driving range test device for electric vehicles includes:

[0146] A first determining module 10 is configured to determine a maximum discharge capacity E of the power battery of the vehicle under test during driving at high and low temperatures and a power consumption E1 during the initial setting of the air conditioner based on a maximum discharge capacity test of the vehicle under test during driving at high and low temperatures and a power consumption test during the initial setting of the air conditioner.

[0147] The second determining module 20 is configured to determine the constant speed operating condition power consumption EC1 of the vehicle under test based on the constant speed operating condition power consumption test of the vehicle under test at high and low temperatures;

[0148] A third determining module 30 is configured to determine a speed-shifting operating condition power consumption EC2 of the vehicle under test based on a speed-shifting operating condition power consumption test of the vehicle under test at high and low temperatures;

[0149] The fourth determination module 40 is used to substitute E, E1, and EC1 into the first formula to determine the driving range of the vehicle under test when traveling at a constant speed under high and low temperatures. The first formula is:

[0150]

[0151] The fifth determination module 50 is used to substitute E, E1, and EC2 into a second formula to determine the driving range of the vehicle under test when the vehicle is driving at variable speeds under high and low temperatures. The second formula is:

[0152]

[0153] R const_speed R is the driving range of the vehicle under test when it is running at a constant speed under high and low temperature conditions. cycle_speed It is the driving range of the vehicle under test when driving at variable speeds under high and low temperatures.

[0154] Furthermore, in one embodiment, the third determining module 30 is configured to:

[0155] Based on the power consumption test of the vehicle under test under the speed change condition at high and low temperatures, sampling data at each sampling moment during the power consumption test under the speed change condition is obtained, and the sampling data includes speed value, acceleration value and power battery power;

[0156] If the speed and acceleration included in the sampled data are within the effective speed-acceleration subinterval of the CLTC-P standard operating condition, the sampled data are placed in a data set corresponding to the effective speed-acceleration subinterval of the CLTC-P standard operating condition until the number of sampled data in the data sets corresponding to the effective speed-acceleration subintervals of all CLTC-P standard operating conditions is greater than a preset value, wherein the effective speed-acceleration subinterval of the CLTC-P standard operating condition corresponds to a speed range and an acceleration range;

[0157] For each data set, the speed values ​​contained in the data set are summed to obtain the total mileage, and the power battery power values ​​contained in the data set are summed to obtain the total power battery energy consumption;

[0158] Based on the total mileage and total battery energy consumption corresponding to each data set, the power consumption corresponding to each data set is obtained;

[0159] The power consumption corresponding to all data sets is integrated to obtain the power consumption EC2 of the speed change condition of the vehicle under test.

[0160] Furthermore, in one embodiment, the sampled data also includes low-voltage accessory power, high-voltage accessory power, and motor controller power. The road-based electric vehicle high and low temperature driving range test device also includes a deletion module for:

[0161] For each data set, delete the sampled data corresponding to the maximum and minimum values ​​of the low-voltage accessory power, delete the sampled data corresponding to the maximum and minimum values ​​of the high-voltage accessory power, and delete the sampled data corresponding to the maximum and minimum values ​​of the motor controller power.

[0162] Furthermore, in one embodiment, the third determining module 30 is configured to:

[0163] The power consumption corresponding to all data sets is weightedly summed to obtain the power consumption EC2 of the power battery of the vehicle under test under the speed change condition.

[0164] Furthermore, in one embodiment, for any data set D i , dataset D i The corresponding weight R i Determined by the weight calculation formula, the weight calculation formula is:

[0165]

[0166] Where C is the total number of landing points under CLTC-P standard working condition, 1800, m i The second-by-second speed-acceleration of the CLTC-P standard working condition in the data set D i The number of landing points in the effective speed-acceleration sub-interval of the corresponding CLTC-P standard working condition.

[0167] Among them, the functional implementation of each module in the above-mentioned road-based electric vehicle high and low temperature driving range test device corresponds to the various steps in the above-mentioned road-based electric vehicle high and low temperature driving range test method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0168] On the third aspect, an embodiment of the present application provides a road-based electric vehicle high and low temperature driving range test device. The road-based electric vehicle high and low temperature driving range test device can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0169] Reference Figure 4 , Figure 4 This is a hardware structure diagram of the road-based electric vehicle high and low temperature driving range test equipment involved in the embodiment of the present application. In the embodiment of the present application, the road-based electric vehicle high and low temperature driving range test equipment may include a processor, a memory, a communication interface, and a communication bus.

[0170] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0171] Communication interfaces include input / output (I / O) interfaces, physical interfaces, and logical interfaces, used to interconnect components within the road-based electric vehicle high- and low-temperature driving range test equipment, as well as interfaces used to interconnect the road-based electric vehicle high- and low-temperature driving range test equipment with other devices (such as other computing devices or user devices). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user devices can be displays, keyboards, etc.

[0172] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0173] The processor may be a general-purpose processor that can call a road-based electric vehicle high- and low-temperature driving range test program stored in a memory and execute the road-based electric vehicle high- and low-temperature driving range test method provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the road-based electric vehicle high- and low-temperature driving range test program is called can refer to the various embodiments of the road-based electric vehicle high- and low-temperature driving range test method of the present application, and will not be repeated here.

[0174] Those skilled in the art will understand that Figure 4 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0175] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0176] The computer-readable storage medium of the present application stores a road-based electric vehicle high and low temperature driving range test program, wherein when the road-based electric vehicle high and low temperature driving range test program is executed by a processor, the steps of the road-based electric vehicle high and low temperature driving range test method as described above are implemented.

[0177] Among them, the method implemented when the road-based electric vehicle high and low temperature driving range test program is executed can refer to the various embodiments of the road-based electric vehicle high and low temperature driving range test method of this application, and will not be repeated here.

[0178] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0179] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0180] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0181] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0182] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0183] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0184] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A road-based high and low temperature driving range test method for electric vehicles, characterized in that: The road-based high and low temperature driving range test method for electric vehicles includes: Based on the maximum discharge capacity test of the vehicle under test at high and low temperatures and the power consumption test during the initial setting of the air conditioner, the maximum discharge capacity of the power battery of the vehicle under test at high and low temperatures is determined. And the power consumption during the initial setting phase of the air conditioner ; Based on the constant speed power consumption test of the vehicle under test at high and low temperatures, the constant speed power consumption of the vehicle under test is determined ; Based on the speed change power consumption test of the vehicle under test at high and low temperatures, the speed change power consumption of the vehicle under test is determined. ; Will 、 as well as Substitute into the first formula to determine the driving range of the vehicle under test when driving at a constant speed in high and low temperatures. The first formula is: Will 、 as well as Substitute into the second formula to determine the driving range of the vehicle under test when driving at variable speeds under high and low temperatures. The second formula is: is the driving range of the vehicle under test when driving at a constant speed under high and low temperature conditions, The driving range of the vehicle under test when driving at variable speeds under high and low temperatures; The power consumption test of the speed change working condition of the vehicle to be tested is carried out at high and low temperatures to determine the power consumption of the speed change working condition of the vehicle to be tested. The steps include: Based on the power consumption test of the vehicle under test under the speed change condition at high and low temperatures, sampling data at each sampling moment during the power consumption test under the speed change condition is obtained, and the sampling data includes speed value, acceleration value and power battery power; If the speed and acceleration included in the sampled data are within the effective speed-acceleration subinterval of the CLTC-P standard operating condition, the sampled data are placed in a data set corresponding to the effective speed-acceleration subinterval of the CLTC-P standard operating condition until the number of sampled data in the data sets corresponding to the effective speed-acceleration subintervals of all CLTC-P standard operating conditions is greater than a preset value, wherein the effective speed-acceleration subinterval of the CLTC-P standard operating condition corresponds to a speed range and an acceleration range; For each data set, the speed values ​​contained in the data set are summed to obtain the total mileage, and the power battery power values ​​contained in the data set are summed to obtain the total power battery energy consumption; Based on the total mileage and total battery energy consumption corresponding to each data set, the power consumption corresponding to each data set is obtained; The power consumption of all data sets is combined to obtain the power consumption of the vehicle under test under the speed change condition. .

2. The road-based high and low temperature driving range test method for electric vehicles according to claim 1, characterized in that: The sampled data also includes low-voltage accessory power, high-voltage accessory power, and motor controller power. Before the steps of integrally summing the speed values ​​contained in each data set to obtain the total mileage, and integrally summing the power battery power contained in the data set to obtain the total power battery energy consumption, the steps further include: For each data set, delete the sampled data corresponding to the maximum and minimum values ​​of the low-voltage accessory power, delete the sampled data corresponding to the maximum and minimum values ​​of the high-voltage accessory power, and delete the sampled data corresponding to the maximum and minimum values ​​of the motor controller power.

3. The high and low temperature driving range test method for electric vehicles based on roads according to claim 1, characterized in that: The power consumption corresponding to all data sets is integrated to obtain the power consumption of the vehicle under test under the speed change condition. The steps include: Perform weighted summation of the power consumption corresponding to all data sets to obtain the power consumption of the power battery of the vehicle under test under variable speed conditions. .

4. The road-based high and low temperature driving range test method for electric vehicles according to claim 3, characterized in that: For any dataset , dataset The corresponding weight Determined by the weight calculation formula, the weight calculation formula is: in, The total number of landing points for CLTC-P standard working conditions is 1800. The second-by-second speed-acceleration of the CLTC-P standard working condition in the data set The number of landing points in the effective speed-acceleration sub-interval of the corresponding CLTC-P standard working condition.

5. A road-based high and low temperature driving range test device for electric vehicles, characterized in that: The road-based electric vehicle high and low temperature driving range test device includes: The first determination module is used to determine the maximum discharge capacity of the power battery of the vehicle to be tested under high and low temperature conditions based on the maximum discharge capacity test of the vehicle to be tested under high and low temperature conditions and the power consumption test during the initial setting of the air conditioner. And the power consumption during the initial setting phase of the air conditioner ; The second determination module is used to determine the constant speed power consumption of the vehicle to be tested based on the constant speed power consumption test of the vehicle to be tested at high and low temperatures. ; The third determination module is used to obtain sampling data at each sampling moment during the speed-changing condition power consumption test based on the speed-changing condition power consumption test conducted on the vehicle to be tested at high and low temperatures, and the sampling data includes speed value, acceleration value and power battery power; if the speed value and acceleration included in the sampling data are in the effective speed-acceleration sub-interval of the CLTC-P standard condition, the sampling data are placed in the data set corresponding to the effective speed-acceleration sub-interval of the CLTC-P standard condition, until the number of sampling data in the data set corresponding to the effective speed-acceleration sub-interval of all CLTC-P standard conditions is greater than the preset value, wherein the effective speed-acceleration sub-interval of the CLTC-P standard condition corresponds to a speed range and an acceleration range; for each data set, the speed values ​​contained in the data set are integrated and summed to obtain the total mileage, and the power battery power contained in the data set is integrated and summed to obtain the total power battery energy consumption; based on the total mileage and the total power battery energy consumption corresponding to each data set, the power consumption corresponding to each data set is obtained; and the power consumption corresponding to all data sets is combined to obtain the speed-changing condition power consumption of the vehicle to be tested. ; The fourth determining module is used to 、 as well as Substitute into the first formula to determine the driving range of the vehicle under test when driving at a constant speed in high and low temperatures. The first formula is: The fifth determining module is used to 、 as well as Substitute into the second formula to determine the driving range of the vehicle under test when driving at variable speeds under high and low temperatures. The second formula is: is the driving range of the vehicle under test when driving at a constant speed under high and low temperature conditions, It is the driving range of the vehicle under test when driving at variable speeds under high and low temperatures.

6. The high and low temperature driving range test device for electric vehicles based on roads according to claim 5, characterized in that: The sampled data also includes low-voltage accessory power, high-voltage accessory power, and motor controller power. The road-based electric vehicle high and low temperature driving range test device also includes a deletion module for: For each data set, delete the sampled data corresponding to the maximum and minimum values ​​of the low-voltage accessory power, delete the sampled data corresponding to the maximum and minimum values ​​of the high-voltage accessory power, and delete the sampled data corresponding to the maximum and minimum values ​​of the motor controller power.

7. A road-based high and low temperature driving range test equipment for electric vehicles, characterized in that: The road-based electric vehicle high and low temperature driving range test equipment includes a processor, a memory, and a road-based electric vehicle high and low temperature driving range test program stored on the memory and executable by the processor. When the road-based electric vehicle high and low temperature driving range test program is executed by the processor, the steps of the road-based electric vehicle high and low temperature driving range test method as described in any one of claims 1 to 4 are implemented.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a road-based electric vehicle high and low temperature driving range test program, wherein when the road-based electric vehicle high and low temperature driving range test program is executed by a processor, the steps of the road-based electric vehicle high and low temperature driving range test method as described in any one of claims 1 to 4 are implemented.

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