CN113777513A

CN113777513A - Electric vehicle testing method, method and device for determining remaining mileage and vehicle

Info

Publication number: CN113777513A
Application number: CN202111063810.8A
Authority: CN
Inventors: 张立庆; 刘忠华; 王磊; 张向鑫; 范晓雨; 孙明
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2021-12-10

Abstract

The invention relates to a method for testing an electric vehicle, a method for determining remaining mileage, a device and a vehicle, relating to the technical field of vehicle testing, wherein the method comprises the following steps: acquiring a first effective power and a second effective power of each energy consumption system in a plurality of energy consumption systems, and a third effective power and a fourth effective power of a battery system; determining a first power variation of each energy consumption system according to the first effective power and the second effective power of each energy consumption system; determining a second power variation of the battery system according to the third effective power and the fourth effective power; determining a third power variation of a target system according to the first power variation and the second power variation of each energy consumption system, wherein the target system is composed of a plurality of energy consumption systems and a battery system; and determining the first power variation ratio of each energy consumption system and the second power variation ratio of the battery system according to the first power variation, the second power variation and the third power variation.

Description

Electric vehicle testing method, method and device for determining remaining mileage and vehicle

Technical Field

The disclosure relates to the technical field of vehicle testing, in particular to a method for testing an electric vehicle, a method and a device for determining remaining mileage and a vehicle.

Background

With the rapid development of electric vehicle technology and the continuous increase of user application scenes, on the premise that the capacity of a matched battery of a whole vehicle is certain, how to further increase the driving range in a low-temperature environment becomes a key point concerned by manufacturers and users.

At present, the low-temperature driving range of the electric vehicle is evaluated by using an attenuation rate, namely the ratio of the attenuation of the low-temperature driving range relative to the normal-temperature driving range under a specific working condition. The low-temperature cruising attenuation rate of the electric vehicle in the market is generally 30-50%, the reason for reducing the attenuation rate is various due to the great reduction of cruising of the electric vehicle in a low-temperature scene, but manufacturers generally attribute the main reason to the heating energy consumption of an air conditioner in a passenger compartment, neglect the influence of other system components and cause the optimization direction of the vehicle to be over-subjectively judged. The occupation ratios of various reasons causing great attenuation of endurance in a low-temperature scene cannot be accurately determined, and the vehicle can be accurately optimized according to the occupation ratios of the various reasons.

Disclosure of Invention

In order to solve the above problems, the present disclosure provides a method for testing an electric vehicle, a method and an apparatus for determining a remaining mileage, and a vehicle.

In a first aspect, the present disclosure provides a method of electric vehicle testing, the method comprising: acquiring first effective power and second effective power of each energy consumption system in a plurality of energy consumption systems of an electric vehicle, wherein the first effective power is the effective power of each energy consumption system in a normal temperature state, and the second effective power is the effective power of each energy consumption system in a low temperature state; acquiring a third effective power and a fourth effective power of a battery system of the electric vehicle, wherein the third effective power is the effective power of the battery system in a normal temperature state, and the fourth effective power is the effective power of the battery system in a low temperature state; determining a first power variation of each energy consumption system according to the first effective power and the second effective power of each energy consumption system; and determining a second power variation of the battery system according to the third effective power and the fourth effective power of the battery system; determining a third power variation of a target system according to the first power variation and the second power variation of each energy consumption system, wherein the target system is composed of the plurality of energy consumption systems and the battery system; determining a first power variation ratio of each energy consumption system in a target system or a second power variation ratio of the battery system in the target system according to the first power variation, the second power variation and the third power variation of each energy consumption system; the first power variation ratio is used for representing the influence degree of the energy consumption system on the endurance capacity attenuation of the electric vehicle in a low-temperature state; and the second power variation ratio is used for representing the influence degree of the battery system on the endurance capacity attenuation of the electric vehicle in the low-temperature state.

Optionally, the obtaining the first effective power and the second effective power of each of a plurality of energy consumption systems of the electric vehicle comprises: determining a plurality of preset SOC ranges to be tested of the electric vehicle, and determining a plurality of preset test working conditions corresponding to each preset SOC range in the plurality of preset SOC ranges; acquiring a first average power and a second average power of each energy consumption system in the plurality of energy consumption systems under the current preset test condition aiming at each preset test condition, wherein the first average power is the average power of each energy consumption system under a normal temperature state, and the second average power is the average power of each energy consumption system under a low temperature state; determining a first effective power of each energy consumption system in a normal temperature state according to the first average power under each preset test condition; determining a second effective power of each energy consumption system in a low-temperature state according to the second average power under each preset test condition; the obtaining of the third effective power and the fourth effective power of the battery system of the electric vehicle includes: acquiring first discharge information and second discharge information of a battery system of the electric vehicle, wherein the first discharge information is discharge information of the battery system in a normal temperature state, and the second discharge information is discharge information of the battery system in a low temperature state; determining third effective power of the battery system in a normal temperature state according to the first discharge information of the battery system; and determining fourth effective power of the battery system in a low-temperature state according to the second discharge information of the battery system.

Optionally, the determining, according to the first average power under each preset test condition, a first effective power of each energy consumption system at a normal temperature state includes: determining a first weight coefficient of each energy consumption system under the current preset test working condition according to the first average power under the current preset test working condition aiming at each preset test working condition; determining a first effective power of each energy consumption system in a normal temperature state according to the first average power and the first weight coefficient under each preset test condition; determining a second effective power of each energy consumption system in a low-temperature state according to the second average power under each preset test condition comprises: determining a second weight coefficient of each energy consumption system under the current preset test working condition according to the second average power under the current preset test working condition aiming at each preset test working condition; and determining a second effective power of each energy consumption system in a low-temperature state according to the second average power and the second weight coefficient under each preset test working condition.

Optionally, the determining, for each preset test condition, a first weight coefficient of each energy consumption system under the current preset test condition according to the first average power under the current preset test condition includes: for each preset test working condition, taking the ratio of the first average power to the third average power as a first weight coefficient of each energy consumption system under the current preset test working condition; the third average power is the sum of the first average power of each energy consumption system under each preset test working condition at a normal temperature state; the determining, for each preset test condition, a second weight coefficient of each energy consumption system under the current preset test condition according to the second average power under the current test condition includes: for each preset test working condition, taking the ratio of the second average power to the fourth average power as a second weight coefficient of each energy consumption system under the current preset test working condition; the fourth average power is the sum of the second average power of each energy consumption system under each preset test working condition in a low-temperature state.

Optionally, the determining, according to the first average power and the first weight coefficient under each preset test condition, a first effective power of each energy consumption system at a normal temperature state includes: regarding each preset test working condition, taking a product of the first average power and the first weight coefficient as a first product, and taking a sum of the first products under each preset test working condition as a first effective power of each energy consumption system under a normal temperature state; determining a second effective power of each energy consumption system in a low-temperature state according to the second average power and the second weight coefficient under each preset test condition comprises: and regarding each preset test working condition, taking the product of the second average power and the second weight coefficient as a second product, and taking the sum of the second products under each preset test working condition as a second effective power of each energy consumption system under a low-temperature state.

Optionally, the first discharge information includes a first discharge amount and a first duration, the second discharge information includes a second discharge amount and a second duration, and the determining, according to the first discharge information, a third effective power of the battery system in the normal temperature state includes: taking the ratio of the first discharge capacity to the first endurance time as a third effective power of the battery system in a normal temperature state; the determining, according to the second discharge information, fourth effective power of the battery system in a low-temperature state includes: and taking the ratio of the second discharge capacity to the second endurance time as the fourth effective power of the battery system in a low-temperature state.

In a second aspect, the present disclosure provides a method of determining remaining range, the method comprising: under the condition that the temperature of the environment where the electric vehicle is located is smaller than or equal to a preset temperature threshold value, acquiring the instantaneous power of each energy consumption system in a plurality of energy consumption systems of the electric vehicle; acquiring the speed of the electric vehicle at the current moment and the expected remaining mileage corresponding to the SOC of the electric vehicle at the current moment; the expected remaining mileage is the remaining mileage corresponding to the SOC of the electric vehicle at the normal temperature; determining the remaining mileage of the electric vehicle in a low temperature state according to the instantaneous power, the vehicle speed, the expected remaining mileage, a second effective power, a first power variation proportion and a second power variation proportion of each energy consumption system; wherein the second effective power, the first power variation ratio, and the second power variation ratio are predetermined by the method for testing an electric vehicle.

In a third aspect, the present disclosure provides an apparatus for electric vehicle testing, the apparatus comprising: the energy consumption control system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring first effective power and second effective power of each energy consumption system in a plurality of energy consumption systems of an electric vehicle, the first effective power is effective power of each energy consumption system in a normal temperature state, and the second effective power is effective power of each energy consumption system in a low temperature state; acquiring a third effective power and a fourth effective power of a battery system of the electric vehicle, wherein the third effective power is the effective power of the battery system in a normal temperature state, and the fourth effective power is the effective power of the battery system in a low temperature state; a first determining module, configured to determine a first power variation of each energy consumption system according to the first effective power and the second effective power of each energy consumption system; and determining a second power variation of the battery system according to the third effective power and the fourth effective power of the battery system; a second determining module, configured to determine a third power variation of a target system according to the first power variation and the second power variation of each energy consumption system, where the target system is composed of the plurality of energy consumption systems and the battery system; the proportion determining module is used for determining a first power variation proportion of each energy consumption system in a target system or a second power variation proportion of the battery system in the target system according to the first power variation, the second power variation and the third power variation of each energy consumption system; the first power variation ratio is used for representing the influence degree of the energy consumption system on the endurance capacity attenuation of the electric vehicle in a low-temperature state; and the second power variation ratio is used for representing the influence degree of the battery system on the endurance capacity attenuation of the electric vehicle in the low-temperature state.

Optionally, the obtaining module includes: the first determining submodule is used for determining a plurality of preset SOC ranges to be tested of the electric vehicle and determining a plurality of preset testing working conditions corresponding to each preset SOC range in the preset SOC ranges; the first obtaining submodule is used for obtaining a first average power and a second average power of each energy consumption system in the plurality of energy consumption systems under the current preset test working condition aiming at each preset test working condition, wherein the first average power is the average power of each energy consumption system under a normal temperature state, and the second average power is the average power of each energy consumption system under a low temperature state; the second determining submodule is used for determining first effective power of each energy consumption system in a normal temperature state according to the first average power under each preset test working condition; determining a second effective power of each energy consumption system in a low-temperature state according to the second average power under each preset test condition; the acquisition module further comprises: the second obtaining submodule is used for obtaining first discharging information and second discharging information of a battery system of the electric vehicle, wherein the first discharging information is discharging information of the battery system in a normal temperature state, and the second discharging information is discharging information of the battery system in a low temperature state; the third determining submodule is used for determining third effective power of the battery system in a normal temperature state according to the first discharging information of the battery system; and determining fourth effective power of the battery system in a low-temperature state according to the second discharge information of the battery system.

Optionally, the second determining submodule is configured to determine, for each preset test condition, a first weight coefficient of each energy consumption system under the current preset test condition according to the first average power under the current preset test condition; determining a first effective power of each energy consumption system in a normal temperature state according to the first average power and the first weight coefficient under each preset test condition; the second determining submodule is used for determining a second weight coefficient of each energy consumption system under the current preset test working condition according to the second average power under the current preset test working condition aiming at each preset test working condition; and determining a second effective power of each energy consumption system in a low-temperature state according to the second average power and the second weight coefficient under each preset test working condition.

Optionally, the second determining submodule is configured to, for each preset test condition, use a ratio of the first average power to the third average power as a first weight coefficient of each energy consumption system under the current preset test condition; the third average power is the sum of the first average power of each energy consumption system under each preset test working condition at a normal temperature state; the second determining submodule is configured to, for each preset test condition, use a ratio of the second average power to the fourth average power as a second weight coefficient of each energy consumption system under the current preset test condition; the fourth average power is the sum of the second average power of each energy consumption system under each preset test working condition in a low-temperature state.

Optionally, the second determining submodule is configured to, for each preset test condition, use a product of the first average power and the first weight coefficient as a first product, and use a sum of the first products under each preset test condition as a first effective power of each energy consumption system in a normal temperature state; and the second determining submodule is used for taking the product of the second average power and the second weight coefficient as a second product according to each preset test working condition, and taking the sum of the second products under each preset test working condition as the second effective power of each energy consumption system under the low-temperature state.

Optionally, the first discharge information includes a first discharge amount and a first duration, the second discharge information includes a second discharge amount and a second duration, and the third determining submodule is configured to use a ratio of the first discharge amount to the first duration as a third effective power of the battery system in a normal temperature state; the third determining submodule is used for taking the ratio of the second discharge capacity to the second endurance time as a fourth effective power of the battery system in a low-temperature state.

In a fourth aspect, the present disclosure provides an apparatus for determining remaining mileage, the apparatus comprising: the first acquisition module is used for acquiring the instantaneous power of each energy consumption system in a plurality of energy consumption systems of the electric vehicle under the condition that the temperature of the environment where the electric vehicle is located is less than or equal to a preset temperature threshold value; the second acquisition module is used for acquiring the speed of the electric vehicle at the current moment and the expected remaining mileage corresponding to the SOC at the current moment; the expected remaining mileage is the remaining mileage corresponding to the SOC of the electric vehicle at the normal temperature; the mileage determining module is used for determining the remaining mileage of the electric vehicle in a low-temperature state according to the instantaneous power, the vehicle speed, the expected remaining mileage, the second effective power, the first power variation proportion and the second power variation proportion of each energy consumption system; wherein the second effective power, the first power variation ratio, and the second power variation ratio are predetermined by the method for testing an electric vehicle.

In a fifth aspect, the present disclosure provides a vehicle comprising the above-mentioned electric vehicle testing apparatus; or, the device for determining the remaining mileage is included.

According to the technical scheme, the first effective power and the second effective power of each energy consumption system in the plurality of energy consumption systems of the electric vehicle are obtained, wherein the first effective power is the effective power of each energy consumption system in a normal temperature state, and the second effective power is the effective power of each energy consumption system in a low temperature state; acquiring a third effective power and a fourth effective power of a battery system of the electric vehicle, wherein the third effective power is the effective power of the battery system in a normal temperature state, and the fourth effective power is the effective power of the battery system in a low temperature state; determining a first power variation of each energy consumption system according to the first effective power and the second effective power of each energy consumption system; determining a second power variation of the battery system according to the third effective power and the fourth effective power of the battery system; determining a third power variation of a target system according to the first power variation and the second power variation of each energy consumption system, wherein the target system is composed of a plurality of energy consumption systems and a battery system; and determining the first power variation ratio of each energy consumption system in the target system or the second power variation ratio of the battery system in the target system according to the first power variation, the second power variation and the third power variation of each energy consumption system. Therefore, the power variation ratio of each energy consumption system and the battery system in the target system can be accurately determined according to the first effective power of each energy consumption system in the normal-temperature state and the second effective power of each energy consumption system in the low-temperature state, the third effective power of the battery system in the normal-temperature state and the fourth effective power of the battery system in the low-temperature state, a clear direction is provided for optimizing the energy consumption of the vehicle, and the driving experience of a user is further improved.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic flow chart illustrating a method for testing an electric vehicle according to an embodiment of the present disclosure;

FIG. 2 is a schematic flow chart illustrating another method for testing an electric vehicle provided by the disclosed embodiment;

FIG. 3 is a schematic flow chart illustrating another method for testing an electric vehicle provided by the disclosed embodiments;

fig. 4 is a flowchart illustrating a method for determining remaining mileage according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of an apparatus for testing an electric vehicle according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of another device for testing an electric vehicle according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another device for testing an electric vehicle according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an apparatus for determining remaining mileage according to an embodiment of the present disclosure;

FIG. 9 is a block diagram of a vehicle provided by an embodiment of the present disclosure;

FIG. 10 is a block diagram of another vehicle provided by embodiments of the present disclosure.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the description that follows, the terms "first," "second," and the like are used for descriptive purposes only and are not intended to indicate or imply relative importance nor order to be construed.

First, an application scenario of the present disclosure will be described, in which the electric vehicle is at a low temperature, and the driving range of the electric vehicle is affected by various reasons. Currently, the driving range of an electric vehicle in a low-temperature environment is evaluated by adopting an attenuation rate, namely, the ratio of the attenuation of the low-temperature driving range relative to the normal-temperature driving range under a specific working condition. The low-temperature endurance decay rate of the electric vehicle is generally 30-50% in the market, the endurance of the electric vehicle is greatly reduced in a low-temperature scene, and manufacturers generally attribute the main reason of the low-temperature endurance to heating energy consumption of an air conditioner in a passenger compartment and ignore the influence of other system components. However, the inventor finds that a standard calculation and analysis method does not exist at present for further decomposing the proportion of the attenuation rate in the low-temperature endurance attenuation of the system component. At present, manufacturers only use the attenuation rate as a performance index of vehicle type energy consumption optimization, so that the vehicle type optimization direction is over-subjectively judged, and when the attenuation rate difference of different vehicles under low-temperature endurance is small, the vehicle type energy consumption optimization is lack of clear guiding significance only according to the attenuation rate.

In order to solve the above problems, the present disclosure provides a method for testing an electric vehicle, a method and an apparatus for determining a remaining mileage, and a vehicle. The power variation ratio of each energy consumption system and the battery system in the target system can be accurately determined according to the first effective power of each energy consumption system in the normal-temperature state and the second effective power of each energy consumption system in the low-temperature state, the third effective power of the battery system in the normal-temperature state and the fourth effective power of the battery system in the low-temperature state, a clear direction is provided for optimizing the energy consumption of the vehicle, and the driving experience of a user is further improved.

The present disclosure is described below with reference to specific examples.

Fig. 1 is a method for testing an electric vehicle according to an embodiment of the present disclosure, the method including the following steps:

s101, acquiring a first effective power and a second effective power of each energy consumption system in a plurality of energy consumption systems of the electric vehicle, and acquiring a third effective power and a fourth effective power of a battery system of the electric vehicle.

The first effective power is the effective power of each energy consumption system in a normal temperature state, and the second effective power is the effective power of each energy consumption system in a low temperature state; the third effective power is the effective power of the battery system in a normal temperature state, and the fourth effective power is the effective power of the battery system in a low temperature state.

In this embodiment, the plurality of energy consumption systems may include an electric drive system, an air conditioning high voltage system, a low voltage system, and an energy recovery system, and of course, the systems included herein are only examples, and the embodiment is not limited thereto, and other systems that may affect the attenuation rate change of the vehicle in the low temperature state are also included in the energy consumption system of the embodiment.

The electric drive system may include, among other things, an electric bridge and wheel assemblies that may affect the drive resistance and tire rolling resistance of the vehicle at cold temperatures. The high-pressure air conditioning system may include a high-pressure PTC (Positive Temperature Coefficient) and a compressor, which may affect the passenger compartment Temperature and the liquid-heated battery Temperature of the vehicle in a low Temperature state. The low-voltage electric system may include a blower, a water pump, and a low-voltage PTC, which may affect the normal operation of the air conditioner in a low temperature state of the vehicle, and recovers a part of mechanical energy recovered from braking and deceleration coasting of the vehicle and converts it into electric energy by the motor.

S102, determining a first power variation of each energy consumption system according to the first effective power and the second effective power of each energy consumption system; and determining a second power variation of the battery system according to the third effective power and the fourth effective power of the battery system.

The effective power of the electric drive system, the effective power of the air-conditioning high-voltage system and the effective power of the low-voltage system in the low-temperature state are larger than the effective power of the energy recovery system and the battery system in the low-temperature state, so that the difference value of the first effective power and the second effective power of the electric drive system, the air-conditioning high-voltage system and the low-voltage system can be used as the first power variation of the electric drive system, the air-conditioning high-voltage system and the low-voltage system, the difference value of the second effective power and the first effective power of the energy recovery system can be used as the second power variation, and the difference value of the third effective power and the fourth effective power of the battery system can be used as the second power variation of the battery system.

S103, determining a third power variation of the target system according to the first power variation and the second power variation of each energy consumption system.

Wherein the target system is composed of the plurality of energy consumption systems and the battery system.

The third power variation amount of the target system may be a sum of the first power variation amount and the second power variation amount of each energy consumption system.

And S104, determining a first power variation ratio of each energy consumption system in the target system or a second power variation ratio of the battery system in the target system according to the first power variation, the second power variation and the third power variation of each energy consumption system.

The first power variation ratio is used for representing the influence degree of each energy consumption system on the endurance capacity attenuation of the electric vehicle in a low-temperature state; the second power variation ratio is used for representing the influence degree of the battery system on the endurance capacity attenuation of the electric vehicle in a low-temperature state.

The ratio of the first power variation to the third power variation of each energy consumption system may be used as the first power variation of each energy consumption system, and the ratio of the second power variation to the third power variation of the battery system may be used as the second power variation of the battery system.

By adopting the method, the power variation ratio of each energy consumption system and the battery system in the target system can be accurately determined according to the first effective power of each energy consumption system in the normal-temperature state and the second effective power of each energy consumption system in the low-temperature state, the third effective power of the battery system in the normal-temperature state and the fourth effective power of the battery system in the low-temperature state, a clear direction is provided for optimizing the energy consumption of the vehicle, and the driving experience of a user is further improved.

Fig. 2 is a schematic flowchart of another method for detecting an electric vehicle according to an embodiment of the present disclosure, and as shown in fig. 2, step S101 includes the following steps:

s1011, determining a plurality of preset SOC ranges to be tested of the electric vehicle, and determining a plurality of preset test working conditions corresponding to each preset SOC range in the plurality of preset SOC ranges.

The test working conditions comprise running parameters of the vehicle running in the test environment, the running parameters can comprise parameters such as a preset speed range, running acceleration and speed period time, and different preset test working conditions correspond to different running parameters. For example, the test condition may be a CLTC-P cycle condition. The plurality of preset SOC (State of charge) ranges are obtained by dividing all SOC ranges or partial SOC ranges of the vehicle in the whole cruising process, the plurality of preset test working conditions can be partial preset test working conditions or all preset test working conditions in the preset SOC ranges, and in each preset SOC range, the obtained plurality of preset test working conditions are continuously generated test working conditions.

For example, as shown in table 1, a partial SOC range of the vehicle during the whole cruising process is selected and divided.

TABLE 1

As shown in Table 1, the predetermined SOC ranges include 100% -80%, 60% -40%, and 20% -0%. For convenience of further explanation, the SOC range of 100% to 80% is taken as the high SOC range, the SOC range of 60% to 40% is taken as the medium SOC range, and the SOC range of 20% to 0% is taken as the low SOC range. The test condition 1, the test condition 2 and the test condition 3 (i.e. 1,2 and 3 in the table under the range of 100% -80%) corresponding to the high SOC range are partial continuous test conditions in the high SOC range, the test condition 4, the test condition 5 and the test condition 6 (i.e. 4, 5 and 6 in the table under the range of 60% -40%) corresponding to the medium SOC range are partial continuous test conditions in the medium SOC range, and the test condition 7, the test condition 8 and the test condition 9 (i.e. 7,8 and 9 in the table under the range of 20% -0%) corresponding to the low SOC range are partial continuous test conditions in the low SOC range.

It should be noted that, considering that the power of each system under the first test condition is changed greatly when the SOC of the entire vehicle battery is fully charged. Therefore, the test condition 1 in the high SOC range can be the first test condition of the vehicle when the SOC of the battery of the whole vehicle is fully charged, so that the average power of each system in the high SOC range can be more accurately determined, and the power variation of each system can be further determined.

S1012, aiming at each preset test working condition, acquiring a first average power and a second average power of each energy consumption system in the plurality of energy consumption systems under the current preset test working condition.

The first average power is an average power of the energy consumption system in a normal temperature state, the second average power is an average power of the energy consumption system in a low temperature state, the first discharging information is discharging information of the battery system in the normal temperature state, and the second discharging information is discharging information of the battery system in the low temperature state. The normal temperature means a temperature range of the vehicle in a room temperature environment, for example, the normal temperature range may be 20 ℃ to 25 ℃, and the low temperature means a temperature range of the vehicle in a low temperature environment, for example, the low temperature range may be-10 ℃ to-4 ℃, and each preset test condition includes 9 test conditions, for example, 1 to 9 test conditions.

In addition, the first average power and the second average power are obtained by voltage and current sensors or power analyzers installed in the respective systems. The third average power and the fourth average power are obtained from voltage and current sensors or bus signals mounted on the battery system.

And S1013, determining a first effective power of each energy consumption system in a normal temperature state according to the first average power under each preset test condition.

Further, according to each preset test working condition, determining a first weight coefficient of each energy consumption system under the current preset test working condition according to the first average power under the current preset test working condition; and determining the first effective power of each energy consumption system in the normal temperature state according to the first average power and the first weight coefficient under each preset test working condition.

According to each preset test working condition, taking the ratio of the first average power to the third average power as a first weight coefficient of each energy consumption system under the current preset test working condition; the third average power is the sum of the first average power of each energy consumption system under each preset test working condition at the normal temperature state. According to each preset test working condition, taking the product of the first average power and the first weight coefficient as a first product, and taking the sum of the first products under each preset test working condition as the first effective power of each energy consumption system under the normal temperature state

In this step, the manner of determining the first effective power according to the first average power under each preset test condition may be different or the same for different energy consumption systems, and for convenience of description, the following description will be given by taking as an example that the energy consumption systems include an electric drive system, an air-conditioning high-voltage system, a low-voltage electric system and an energy recovery system, and the manner of determining the first effective power according to the first average power under each preset test condition for different energy consumption systems is different, for example,

for the electric drive system, the air-conditioning high-voltage system and the low-voltage system, the average value of the plurality of first average powers can be used as the first effective power of each energy consumption system in the normal temperature state.

For the energy recovery system, a first weight coefficient of each energy consumption system under each preset test condition can be determined according to the acquired first average power, and a first effective power of each energy consumption system under the normal temperature state can be determined according to the first average power and the first weight coefficient.

For example, for each preset test condition, a ratio of the obtained average power under the preset test condition to a sum of average powers under each preset test condition in the energy consumption system is used as a first weight coefficient under the preset test condition.

For each preset test condition, a product of the first average power and the first weight coefficient corresponding to the first average power may be used as a first product, and a sum of a plurality of the first products may be used as a second effective power of each energy consumption system in the low temperature state.

For convenience of explanation, the calculation of the first effective power may be explained by the following table 2, as shown in table 2:

TABLE 2

In table 2, the preset SOC ranges including the high SOC range, the medium SOC range and the low SOC range are described as examples, and each SOC range corresponds to three test conditions, where 1,2 and 3 in the table under the high SOC range are three test conditions corresponding to the high SOC range, 4, 5 and 6 in the table under the medium SOC range are three test conditions corresponding to the medium SOC range, 7,8 and 9 in the table under the low SOC range are three test conditions corresponding to the low SOC range, and P is the maximum value of the test conditions_iNamely the first average power, K, of each energy consumption system under each test working condition at normal temperature_iNamely, the first weight coefficient under each test condition when the energy consumption system comprises the energy recovery system under the normal temperature state. P_{At room temperature A}、P_{Normal temperature B}、P_{Normal temperature C}And P_{Normal temperature D}Namely the first effective power of the energy consumption systems in the normal temperature state. For an electric drive system, the average power P corresponding to each test condition in the high SOC range, the middle SOC range and the low SOC range of the electric drive system can be determined₁～P₉The first effective power of the electric drive system under the normal temperature condition can be determined by the average value of (A), and the first effective power can be obtained by P in the table 2_{At room temperature A}To determine the first available power of the electric drive system at the ambient temperature. By analogy with thatThe first effective power of the high-voltage system and the low-voltage system of the air conditioner at normal temperature can also be according to P in Table 2_{Normal temperature B}And P_{Normal temperature C}Is determined by the calculation formula (c). For an energy recovery system, it is possible to use a first weighting factor K_iAnd P₁～P₉The first effective power of the energy recovery system at the normal temperature state is determined by the weighted average value of (a), which can be represented by P in table 2_{Normal temperature D}The first effective power of the energy recovery system in the normal temperature state is determined by the calculation formula.

Under normal atmospheric temperature state, the change of electric drive system, air conditioner high pressure system and low-voltage electricity system power under each test condition is comparatively steady, consequently, under normal atmospheric temperature state, the first effective power of electric drive system, air conditioner high pressure system and low-voltage electricity system is the average value of a plurality of first average power of this system under each test condition. Since the energy recovery system is in the high SOC range and the low SOC range, the energy recovery power is limited, and the energy recovery power is substantially the same in the middle SOC range. Thus, in the medium SOC range, the first weight coefficient of the energy recovery system is K_b。

Wherein, K_i(i ═ 1,2,3,7,8,9) can be obtained by equation 1:

accordingly, K_bThis can be obtained by equation 2:

in addition, K is_iAnd K_bThe setting can also be carried out according to the power change conditions of different systems in each SOC range, and the method is not limited to the method, and the K corresponding to different systems_iAnd K_bMay be the same or different.

And S1014, determining a second effective power of each energy consumption system in a low-temperature state according to the second average power under each preset test working condition.

Further, according to each preset test working condition, determining a second weight coefficient of each energy consumption system under the current preset test working condition according to a second average power under the current preset test working condition; and determining a second effective power of each energy consumption system in a low-temperature state according to the second average power and the second weight coefficient under each preset test working condition.

According to each preset test working condition, taking the ratio of the second average power to the fourth average power as a second weight coefficient of each energy consumption system under the current preset test working condition; the fourth average power is the sum of the second average power of each energy consumption system under each preset test working condition in the low-temperature state.

And aiming at each preset test working condition, taking the product of the second average power and the second weight coefficient as a second product, and taking the sum of the second products under each preset test working condition as a second effective power of each energy consumption system under a low-temperature state.

In this step, the manner of determining the second effective power according to the second average power under each preset test condition may be different or the same for different energy consumption systems, and for convenience of description, the following description will be given by taking as an example that the energy consumption systems include an electric drive system, an air-conditioning high-voltage system, a low-voltage electric system and an energy recovery system, and the manner of determining the second effective power according to the second average power under each preset test condition for different energy consumption systems is the same, for example,

in the step, for the electric drive system, the air conditioner high-voltage system and the low-voltage system, a second weight coefficient of each energy consumption system under a plurality of preset test working conditions can be determined according to the obtained second average power; and determining a second effective power of each energy consumption system in the low-temperature state according to the second average power and the second weight coefficient.

And for each preset test working condition, taking the ratio of the average power obtained under the preset test working condition to the sum of the average power under each preset test working condition in the energy consumption system as a second weight coefficient under the preset test working condition.

For the energy recovery system, determining a second weight coefficient of each energy consumption system under each preset test condition according to the obtained second average power; and determining a second effective power of each energy consumption system in the low-temperature state according to the second average power and the second weight coefficient.

And for each preset test working condition in each energy consumption system, taking the ratio of the average power obtained under the preset test working condition to the sum of the average powers under a plurality of preset test working conditions in the energy consumption system as a second weight coefficient under the preset test working condition.

Further, for each preset test condition, taking a product of the second average power and the second weight coefficient corresponding to the second average power as a third product, and taking a sum of a plurality of the third products as a second effective power of each energy consumption system in the low-temperature state.

For convenience of explanation, the calculation of the second effective power may be described by the following table 3, as shown in table 3:

TABLE 3

In table 3, the explanation continues by taking as an example that the preset SOC ranges include a high SOC range, a medium SOC range and a low SOC range, and each SOC range corresponds to three test conditions, where 1,2 and 3 in the table under the high SOC range are three test conditions corresponding to the high SOC range, 4, 5 and 6 in the table under the medium SOC range are three test conditions corresponding to the medium SOC range, 7,8 and 9 in the table under the low SOC range are three test conditions corresponding to the low SOC range, and P is_iI.e. the second average power, K, of each energy consumption system in each test condition at low temperature_iNamely, the second weight coefficient K under each test condition when the energy consumption system comprises an electric drive system, an air conditioner high-voltage system and a low-voltage system under the low-temperature state_jI.e. at low temperatureThe energy consumption system comprises an energy recovery system and is a second weight coefficient under each test working condition. P_{Low temperature A}、P_{Low temperature B}、P_{Low temperature C}And P_{Low temperature D}I.e. the second effective power, P, of the plurality of energy consumption systems in the low temperature state_{Low temperature E}Namely, the fourth effective power of the battery system in the low temperature state. For electric drive systems, it is possible to determine the second weighting factor K_iAnd P₁～P₉To determine the second effective power of the electric drive system at low temperature, which can be represented by P in Table 3_{Low temperature A}To determine a second available power of the electric drive system at the low temperature state. By analogy, the second effective powers of the air-conditioning high-voltage system, the low-voltage electric system and the energy recovery system in the low-temperature state can be according to P in Table 3_{Low temperature B}、P_{Low temperature C}And P_{Low temperature D}Is determined by the calculation formula (c).

Under the low temperature state, the electric drive system is in a high SOC range, the temperature of the vehicle transmission lubrication system and the temperature of the tires are lower, so that the internal resistance and the running resistance of the whole vehicle are larger, the temperature of the whole vehicle lubrication system and the temperature of the tires tend to be stable in a middle SOC range and a low SOC range, and the internal resistance and the running resistance are relatively reduced, so that the second weight coefficients are K in the middle SOC range and the low SOC range_a. The air-conditioning high-pressure system needs to balance the whole vehicle dynamic property and the heating of the passenger compartment in a high SOC range, namely a high power demand and a low SOC range in the initial stage of the test, and the temperature of the passenger compartment of the vehicle tends to be stable in a middle SOC range, so that the second weight coefficient is K in the middle SOC range_c. The energy consumption of the low-voltage system is changed relative to the heating of the air conditioner, so that in the middle SOC range, the second weight coefficient is K_d. In the energy recovery system, the energy recovery power is limited in a high SOC range and a low SOC range, and the energy recovery power is substantially the same in a middle SOC range. Thus, in the middle SOC range, the second weight coefficient of the energy recovery system is K_e。

Wherein, K_iAnd K_jAll can be obtained by the formula 1, K_c、K_dAnd K_eAll can be obtained by the formula 2, K_aObtained by equation 3：

Note that, K is_i、K_j、K_a、K_c、K_dAnd K_eThe method can also be set according to the power change conditions of different systems in each SOC range, and is not limited to the method, and the K corresponding to different systems_iAnd K_jMay be the same or different.

Fig. 3 is another method for detecting an electric vehicle according to an embodiment of the present disclosure, where step S101 further includes the following steps:

and S1015, acquiring first discharge information and second discharge information of a battery system of the electric vehicle.

The first discharging information is discharging information of the battery system in a normal temperature state, and the second discharging information is discharging information of the battery system in a low temperature state.

And S1016, determining third effective power of the battery system in a normal temperature state according to the first discharge information of the battery system.

In a possible implementation manner of this step, a ratio of the first discharge amount to the first duration may be used as a third effective power of the battery system in the normal temperature state.

And taking the ratio of the first discharge capacity to the first endurance time as the third effective power of the battery system in the normal temperature state.

For example, the third effective power can be calculated by the following equation 4:

P_{ambient temperature E}＝Q_{At normal temperature}/t_{At normal temperature}(formula 4)

Wherein, P_{Ambient temperature E}For the third effective power, Q_{At normal temperature}Is a first discharge amount, t_{At normal temperature}Is the first endurance time.

S1017, determining fourth effective power of the battery system in a low-temperature state according to the second discharging information of the battery system.

And taking the ratio of the second discharge capacity to the second endurance time as the fourth effective power of the battery system in the low-temperature state.

In a possible implementation manner of this step, a ratio of the second discharge amount to the second endurance time may be used as the fourth effective power of the battery system in the low temperature state.

For example, the fourth effective power can be calculated by the following equation 5:

P_{low temperature E}＝Q_{Low temperature}/t_{Low temperature}(formula 5)

Wherein, P_{Low temperature E}Is the fourth effective power, Q_{Low temperature}Is the second discharge amount, t_{Low temperature}The second endurance time.

The following describes steps S102 to S104 in detail.

Different energy consumption systems, based on the first effective power, the second effective power, the third effective power and the fourth effective power, determine the ratio of the first power variation and the first power variation of each energy consumption system, and the ratio of the second power variation and the second power variation of the battery system, which may be the same or different, for example,

for the electric drive system, the air conditioning high-voltage system and the low-voltage system, the difference between the second available power and the first available power may be used as a first difference (corresponding to a first power variation).

For the energy recovery system, the difference between the first effective power and the second effective power can be used as a second difference (corresponding to the first power variation).

For the battery system, a difference between the third effective power and the fourth effective power may be used as a third difference (corresponding to a second power variation).

Further, for the electric drive system, the air conditioning high voltage system, and the low voltage system, a ratio of the first difference to a plurality of first differences, second differences, and third differences and (corresponding to a third power variation) may be used as a ratio of the first power variation in the plurality of energy consumption systems and the battery system for each energy consumption system.

For the energy recovery system, a ratio of the second difference to a plurality of first differences, second differences, and third differences may be used as a first power variation ratio of each energy consumption system in a plurality of the energy consumption systems and the battery system.

For the battery system, a ratio of the third difference to a plurality of first differences, second differences, and third differences may be used as a second power variation ratio of the battery system in a plurality of the energy consumption systems and the battery system.

For convenience of explanation, the calculation of the first power variation ratio and the second power variation ratio may be described by the following table 4, as shown in table 4:

TABLE 4

Wherein, in Table 4, Δ P_A、△P_B、△P_CAnd Δ P_DRespectively, a first power variation, DeltaP, of a plurality of energy consuming systems_EA, B, C and D are the first power variation ratios of each energy consumption system in a plurality of energy consumption systems and the battery system respectively, and E is the second power variation ratios of the battery system in a plurality of energy consumption systems and the battery system respectively. For an electric drive system, the first useful power P at room temperature can be determined from tables 2 and 3_{At room temperature A}And a second effective power P in a low temperature state_{Low temperature A}To determine the first power variation ratio of the electric drive system among the plurality of energy consuming systems and the battery system, the first power variation ratio of the electric drive system among the plurality of energy consuming systems and the battery system may be determined according to the calculation formula of a in table 4. By analogy, the air-conditioning high-voltage system, the low-voltage electric system, the energy recovery system and the battery system can be measured according to the meterB, C, D and E in 4 to determine the corresponding power change ratio.

For electric drive systems, air conditioning high voltage systems and low voltage systems, the effective power at low temperatures is higher than at normal temperatures. For energy recovery systems and battery systems, the available power at normal temperature conditions is generally higher than the available power at low temperature conditions.

If the variation of the effective power is less than or equal to zero, it means that the system has no influence on the variation of the attenuation rate in a low-temperature environment, and the power variation ratio of the system is zero.

Fig. 4 is a method for determining remaining mileage according to an embodiment of the present disclosure, as shown in fig. 4, the method includes the following steps:

s401, under the condition that the temperature of the environment where the electric vehicle is located is smaller than or equal to a preset temperature threshold value, acquiring the instantaneous power of each energy consumption system in a plurality of energy consumption systems of the electric vehicle.

Illustratively, the instantaneous power may include electric drive system instantaneous power P'_AAnd instantaneous power P 'of air-conditioning high-voltage system'_BAnd instantaneous power P 'of low-voltage electric system'_CInstantaneous power P 'of energy recovery system'_DAnd battery system instantaneous work P'_E。

S402, obtaining the speed of the electric vehicle at the current moment and the expected remaining mileage corresponding to the SOC at the current moment.

The expected remaining mileage is a remaining mileage corresponding to the SOC of the electric vehicle at the current time in the normal temperature state, and the specific calculation method may refer to a related calculation method in the prior art, which is not described herein again.

And S403, determining the remaining mileage of the electric vehicle in the low-temperature state according to the instantaneous power, the vehicle speed, the expected remaining mileage, the second effective power, the first power variation ratio and the second power variation ratio of each energy consumption system.

The second effective power, the first power variation ratio and the second power variation ratio are predetermined by the electric vehicle detection method.

As further explained with respect to step S303, the attenuation ratios of the plurality of energy consumption systems and the battery system of the electric vehicle at the current moment are determined according to the plurality of instantaneous powers, the second effective power and the effective power variation.

For convenience of explanation, the above calculation of the attenuation ratio can be illustrated by the following table 5, for example

Shown in Table 5:

instantaneous power (W)	time t(s) decay Rate (%)
		Electric drive system instantaneous power P'_A	A′＝A(P′_A-P_{Low temperature A})/△P_A
Instantaneous power P 'of air-conditioning high-pressure system'_B	B′＝B(P′_B-P_{Low temperature B})/△P_B
		Instantaneous power P 'of low-voltage electric system'_C	C′＝C(P′_C-P_{Low temperature C})/△P_C
Energy recovery system instantaneous power P'_D	D′＝D(P′_D-P_{Low temperature D})/△P_D
		Instantaneous power P 'of battery system'_E	E′＝E

TABLE 5

Wherein, a ', B ', C ', D ' and E ' are attenuation ratios of the plurality of energy consumption systems and the battery system at time t, A, B, C and D are first power variation ratios of the plurality of energy consumption systems in the plurality of energy consumption systems and the battery system, respectively, E is a second power variation ratio of the battery system in the plurality of energy consumption systems and the battery system, and P is_{Low temperature A}、P_{Low temperature B}、P_{Low temperature C}And P_{Low temperature D}Respectively the second effective power, delta P, of the plurality of energy consumption systems in the low temperature state_A、△P_B、△P_C、△P_DAnd Δ P_EThe effective power variation of each energy consumption system and battery system respectively.

Further, the remaining mileage of the electric vehicle in the low-temperature state is determined according to the attenuation proportion, the vehicle speed and the expected remaining mileage of the plurality of energy consumption systems and the battery system at the current moment.

The remaining mileage of the electric vehicle in the low temperature state can be determined by equation 6:

wherein, S'_tIs the remaining mileage at time t in the low temperature state (unit: km), n is the attenuation factor in the low temperature state, and n ═ A ' + B ' + C ' + D ' + E ', S_{At normal temperature}Expected remaining range at ordinary temperature condition (Unit: km), V is the vehicle speed at time t (unit: m/s)

When n is less than zero, n is 0.

By adopting the method, the remaining mileage of the electric vehicle in the low-temperature state can be determined according to the instantaneous power, the vehicle speed, the expected remaining mileage, the second effective power, the first power variation proportion and the second power variation proportion of each energy consumption system in the low-temperature environment of the electric vehicle, so that more accurate remaining mileage can be displayed for a user, the driving state of the user can be adjusted according to the remaining mileage in time, and the user experience is improved.

Fig. 5 is a device for testing an electric vehicle, according to an embodiment of the present disclosure, where the device 500 includes:

the acquiring module 501 is configured to acquire a first effective power and a second effective power of each energy consumption system of a plurality of energy consumption systems of an electric vehicle, where the first effective power is an effective power of each energy consumption system in a normal temperature state, and the second effective power is an effective power of each energy consumption system in a low temperature state; acquiring a third effective power and a fourth effective power of a battery system of the electric vehicle, wherein the third effective power is the effective power of the battery system in a normal temperature state, and the fourth effective power is the effective power of the battery system in a low temperature state;

a first determining module 502, configured to determine a first power variation of each energy consumption system according to the first effective power and the second effective power of each energy consumption system; determining a second power variation of the battery system according to the third effective power and the fourth effective power of the battery system;

a second determining module 503, configured to determine a third power variation of a target system according to the first power variation and the second power variation of each energy consumption system, where the target system is composed of multiple energy consumption systems and a battery system;

a ratio determining module 504, configured to determine a ratio of a first power variation of each energy consumption system in the target system or a ratio of a second power variation of the battery system in the target system according to the first power variation, the second power variation, and the third power variation of each energy consumption system; the first power variation ratio is used for representing the influence degree of the energy consumption system on the endurance capacity attenuation of the electric vehicle in a low-temperature state; and the second power variation ratio is used for representing the influence degree of the battery system on the endurance capacity attenuation of the electric vehicle in the low-temperature state.

Optionally, as shown in fig. 6, the obtaining module 501 includes:

the first determining submodule 5011 is used for determining a plurality of preset SOC ranges to be tested of the electric vehicle and determining a plurality of preset testing working conditions corresponding to each preset SOC range in the plurality of preset SOC ranges;

the first obtaining submodule 5012 is configured to obtain, for each preset test condition, a first average power and a second average power of each energy consumption system in the plurality of energy consumption systems under the current preset test condition, where the first average power is an average power of each energy consumption system at a normal temperature state, and the second average power is an average power of each energy consumption system at a low temperature state;

the second determining submodule 5013 is configured to determine, according to the first average power under each preset test condition, a first effective power of each energy consumption system at a normal temperature state; determining a second effective power of each energy consumption system in a low-temperature state according to the second average power under each preset test condition;

as shown in fig. 7, the obtaining module 501 further includes:

the second obtaining submodule 5014 is configured to obtain first discharge information and second discharge information of a battery system of the electric vehicle, where the first discharge information is discharge information of the battery system in a normal temperature state, and the second discharge information is discharge information of the battery system in a low temperature state;

the third determining submodule 5015 is configured to determine, according to the first discharge information of the battery system, a third effective power of the battery system in a normal temperature state; and determining fourth effective power of the battery system in a low-temperature state according to the second discharge information of the battery system.

Optionally, the second determining submodule 5013 is configured to determine, for each preset test condition, a first weight coefficient of each energy consumption system under the current preset test condition according to the first average power under the current preset test condition; determining a first effective power of each energy consumption system in a normal temperature state according to the first average power and the first weight coefficient under each preset test condition;

the second determining submodule 5013 is configured to determine, for each preset test condition, a second weight coefficient of each energy consumption system under the current preset test condition according to the second average power under the current preset test condition; and determining a second effective power of each energy consumption system in a low-temperature state according to the second average power and the second weight coefficient under each preset test working condition.

Optionally, the second determining submodule 5013 is configured to, for each preset test condition, use a ratio of the first average power to the third average power as a first weight coefficient of each energy consumption system under the current preset test condition; the third average power is the sum of the first average power of each energy consumption system under each preset test working condition at the normal temperature;

the second determining submodule 5013 is configured to, for each preset test condition, use a ratio of the second average power to the fourth average power as a second weight coefficient of each energy consumption system under the current preset test condition; the fourth average power is the sum of the second average power of each energy consumption system under each preset test working condition in the low-temperature state.

Optionally, the second determining submodule 5013 is configured to, for each preset test condition, use a product of the first average power and the first weight coefficient as a first product, and use a sum of the first products under each preset test condition as a first effective power of each energy consumption system in a normal temperature state;

the second determining submodule 5013 is configured to, for each preset test condition, use a product of the second average power and the second weight coefficient as a second product, and use a sum of the second products under each preset test condition as a second effective power of each energy consumption system in the low temperature state.

Optionally, the first discharging information includes a first discharging amount and a first duration, and the second discharging information includes a second discharging amount and a second duration.

The third determining submodule 5015 is configured to use a ratio of the first discharge amount to the first endurance time as a third effective power of the battery system at the normal temperature;

the third determination submodule 5015 is configured to use a ratio of the second discharge amount to the second endurance time as a fourth effective power of the battery system in the low temperature state.

By adopting the device, the power variation ratio of each energy consumption system and the battery system in the target system can be accurately determined according to the first effective power of each energy consumption system in the normal-temperature state and the second effective power of each energy consumption system in the low-temperature state, the third effective power of the battery system in the normal-temperature state and the fourth effective power of the battery system in the low-temperature state, a clear direction is provided for optimizing the energy consumption of the vehicle, and the driving experience of a user is further improved.

Fig. 8 is a device for determining remaining mileage according to an embodiment of the present disclosure, where the device 800 includes:

the first obtaining module 801 is configured to obtain instantaneous power of each energy consumption system of multiple energy consumption systems of an electric vehicle when a temperature of an environment where the electric vehicle is located is less than or equal to a preset temperature threshold;

a second obtaining module 802, configured to obtain a speed of the electric vehicle at a current time and an expected remaining mileage corresponding to the SOC at the current time; the expected remaining mileage is the remaining mileage corresponding to the SOC of the electric vehicle at the normal temperature;

the mileage determining module 803 is configured to determine a remaining mileage of the electric vehicle in a low temperature state according to an instantaneous power, a vehicle speed, an expected remaining mileage, a second effective power, a first power variation duty ratio, and a second power variation duty ratio of each energy consumption system;

the second effective power, the first power variation ratio and the second power variation ratio are predetermined by the electric vehicle testing method.

By adopting the device, the remaining mileage of the electric vehicle in the low-temperature state can be determined according to the instantaneous power, the vehicle speed, the expected remaining mileage, the second effective power, the first power variation ratio and the second power variation ratio of each energy consumption system in the low-temperature environment of the electric vehicle, so that more accurate remaining mileage can be displayed for a user, the user can adjust the driving state according to the remaining mileage in time, and the user experience is improved.

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

Fig. 9 is a schematic diagram of a vehicle 900 including the device 500 for electric vehicle testing described above according to an embodiment of the present disclosure.

Fig. 10 is another vehicle 900 provided by the disclosed embodiment, which includes the device 800 for determining remaining mileage.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A method of electric vehicle testing, the method comprising:

acquiring first effective power and second effective power of each energy consumption system in a plurality of energy consumption systems of an electric vehicle, wherein the first effective power is the effective power of each energy consumption system in a normal temperature state, and the second effective power is the effective power of each energy consumption system in a low temperature state; acquiring a third effective power and a fourth effective power of a battery system of the electric vehicle, wherein the third effective power is the effective power of the battery system in a normal temperature state, and the fourth effective power is the effective power of the battery system in a low temperature state;

determining a first power variation of each energy consumption system according to the first effective power and the second effective power of each energy consumption system; and determining a second power variation of the battery system according to the third effective power and the fourth effective power of the battery system;

determining a third power variation of a target system according to the first power variation and the second power variation of each energy consumption system, wherein the target system is composed of the plurality of energy consumption systems and the battery system;

determining a first power variation ratio of each energy consumption system in a target system or a second power variation ratio of the battery system in the target system according to the first power variation, the second power variation and the third power variation of each energy consumption system; the first power variation ratio is used for representing the influence degree of the energy consumption system on the endurance capacity attenuation of the electric vehicle in a low-temperature state; and the second power variation ratio is used for representing the influence degree of the battery system on the endurance capacity attenuation of the electric vehicle in the low-temperature state.

2. The method of claim 1, wherein the obtaining the first available power and the second available power for each of a plurality of energy consuming systems of the electric vehicle comprises:

determining a plurality of preset SOC ranges to be tested of the electric vehicle, and determining a plurality of preset test working conditions corresponding to each preset SOC range in the plurality of preset SOC ranges;

acquiring a first average power and a second average power of each energy consumption system in the plurality of energy consumption systems under the current preset test condition aiming at each preset test condition, wherein the first average power is the average power of each energy consumption system under a normal temperature state, and the second average power is the average power of each energy consumption system under a low temperature state;

determining a first effective power of each energy consumption system in a normal temperature state according to the first average power under each preset test condition;

determining a second effective power of each energy consumption system in a low-temperature state according to the second average power under each preset test condition;

the obtaining of the third effective power and the fourth effective power of the battery system of the electric vehicle includes:

acquiring first discharge information and second discharge information of a battery system of the electric vehicle, wherein the first discharge information is discharge information of the battery system in a normal temperature state, and the second discharge information is discharge information of the battery system in a low temperature state;

determining third effective power of the battery system in a normal temperature state according to the first discharge information of the battery system;

and determining fourth effective power of the battery system in a low-temperature state according to the second discharge information of the battery system.

3. The method of claim 2, wherein the determining the first effective power of each energy consumption system at the normal temperature according to the first average power under each preset test condition comprises:

determining a first weight coefficient of each energy consumption system under the current preset test working condition according to the first average power under the current preset test working condition aiming at each preset test working condition;

determining a first effective power of each energy consumption system in a normal temperature state according to the first average power and the first weight coefficient under each preset test condition;

determining a second effective power of each energy consumption system in a low-temperature state according to the second average power under each preset test condition comprises:

determining a second weight coefficient of each energy consumption system under the current preset test working condition according to the second average power under the current preset test working condition aiming at each preset test working condition;

and determining a second effective power of each energy consumption system in a low-temperature state according to the second average power and the second weight coefficient under each preset test working condition.

4. The method of claim 3, wherein the determining, for each of the preset test conditions, a first weight coefficient of each of the energy consumption systems under the current preset test condition according to the first average power under the current preset test condition comprises:

for each preset test working condition, taking the ratio of the first average power to the third average power as a first weight coefficient of each energy consumption system under the current preset test working condition; the third average power is the sum of the first average power of each energy consumption system under each preset test working condition at a normal temperature state;

the determining, for each preset test condition, a second weight coefficient of each energy consumption system under the current preset test condition according to the second average power under the current test condition includes:

for each preset test working condition, taking the ratio of the second average power to the fourth average power as a second weight coefficient of each energy consumption system under the current preset test working condition; the fourth average power is the sum of the second average power of each energy consumption system under each preset test working condition in a low-temperature state.

5. The method according to claim 3, wherein the determining the first effective power of each energy consumption system at the normal temperature according to the first average power and the first weight coefficient under each preset test condition comprises:

regarding each preset test working condition, taking a product of the first average power and the first weight coefficient as a first product, and taking a sum of the first products under each preset test working condition as a first effective power of each energy consumption system under a normal temperature state;

determining a second effective power of each energy consumption system in a low-temperature state according to the second average power and the second weight coefficient under each preset test condition comprises:

and regarding each preset test working condition, taking the product of the second average power and the second weight coefficient as a second product, and taking the sum of the second products under each preset test working condition as a second effective power of each energy consumption system under a low-temperature state.

6. The method of claim 2, wherein the first discharge information comprises a first discharge amount and a first duration, the second discharge information comprises a second discharge amount and a second duration, and the determining the third effective power of the battery system in the normal temperature state according to the first discharge information comprises:

taking the ratio of the first discharge capacity to the first endurance time as a third effective power of the battery system in a normal temperature state;

the determining, according to the second discharge information, fourth effective power of the battery system in a low-temperature state includes:

and taking the ratio of the second discharge capacity to the second endurance time as the fourth effective power of the battery system in a low-temperature state.

7. A method of determining remaining range, the method comprising:

under the condition that the temperature of the environment where the electric vehicle is located is smaller than or equal to a preset temperature threshold value, acquiring the instantaneous power of each energy consumption system in a plurality of energy consumption systems of the electric vehicle;

acquiring the speed of the electric vehicle at the current moment and the expected remaining mileage corresponding to the SOC of the electric vehicle at the current moment; the expected remaining mileage is the remaining mileage corresponding to the SOC of the electric vehicle at the normal temperature;

determining the remaining mileage of the electric vehicle in a low temperature state according to the instantaneous power, the vehicle speed, the expected remaining mileage, a second effective power, a first power variation proportion and a second power variation proportion of each energy consumption system; wherein the content of the first and second substances,

the second effective power, the first power variation ratio and the second power variation ratio are predetermined by the method of any one of claims 1 to 6.

8. An apparatus for testing an electric vehicle, the apparatus comprising:

the energy consumption control system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring first effective power and second effective power of each energy consumption system in a plurality of energy consumption systems of an electric vehicle, the first effective power is effective power of each energy consumption system in a normal temperature state, and the second effective power is effective power of each energy consumption system in a low temperature state; acquiring a third effective power and a fourth effective power of a battery system of the electric vehicle, wherein the third effective power is the effective power of the battery system in a normal temperature state, and the fourth effective power is the effective power of the battery system in a low temperature state;

a first determining module, configured to determine a first power variation of each energy consumption system according to the first effective power and the second effective power of each energy consumption system; and determining a second power variation of the battery system according to the third effective power and the fourth effective power of the battery system;

a second determining module, configured to determine a third power variation of a target system according to the first power variation and the second power variation of each energy consumption system, where the target system is composed of the plurality of energy consumption systems and the battery system;

the proportion determining module is used for determining a first power variation proportion of each energy consumption system in a target system or a second power variation proportion of the battery system in the target system according to the first power variation, the second power variation and the third power variation of each energy consumption system; the first power variation ratio is used for representing the influence degree of the energy consumption system on the endurance capacity attenuation of the electric vehicle in a low-temperature state; and the second power variation ratio is used for representing the influence degree of the battery system on the endurance capacity attenuation of the electric vehicle in the low-temperature state.

9. An apparatus for determining remaining mileage, the apparatus comprising:

the first acquisition module is used for acquiring the instantaneous power of each energy consumption system in a plurality of energy consumption systems of the electric vehicle under the condition that the temperature of the environment where the electric vehicle is located is less than or equal to a preset temperature threshold value;

the second acquisition module is used for acquiring the speed of the electric vehicle at the current moment and the expected remaining mileage corresponding to the SOC at the current moment; the expected remaining mileage is the remaining mileage corresponding to the SOC of the electric vehicle at the normal temperature;

the mileage determining module is used for determining the remaining mileage of the electric vehicle in a low-temperature state according to the instantaneous power, the vehicle speed, the expected remaining mileage, the second effective power, the first power variation proportion and the second power variation proportion of each energy consumption system; wherein the content of the first and second substances,

10. A vehicle comprising the device for electric vehicle testing of claim 8; alternatively, a device for determining remaining range as claimed in claim 9 above is included.