CN118625039B - Method and device for testing energy consumption and energy saving of air conditioner at low temperature applied to pure electric passenger car - Google Patents

Abstract

The present invention provides a method and device for testing the energy consumption saving of air conditioners at low temperatures for pure electric passenger vehicles, and relates to the technical field of air conditioner energy consumption testing. The method comprises: using the data acquisition system and the power measurement device to test the vehicle's whole vehicle power consumption and driving range under the conditions of turning on and turning off the air conditioner, respectively, to obtain the first power consumption and low-temperature driving range when the air conditioner is turned on, and the second power consumption when the air conditioner is turned off; according to the difference between the first power consumption and the second power consumption and the influencing factor, the energy saving of the air conditioner at low temperatures compared to the industry average is obtained. The present invention provides a set of standardized devices and methods for testing the energy consumption performance of vehicle air conditioners.

Description

A test method and device for measuring the energy saving of air conditioning at low temperature for pure electric passenger vehicles

Technical Field

The present invention relates to the technical field of air conditioning energy consumption testing, and in particular to a method and device for testing the energy consumption saving of air conditioning at low temperature for a pure electric passenger car.

Background Art

The air conditioning performance of pure electric vehicles is a highly perceived performance that passenger car users pay attention to. With the development of the economy and changes in the natural environment, the frequency and scenarios of users' use of car air conditioners are constantly changing, and the performance requirements for car air conditioners are getting higher and higher. For the temperature sensing performance of air conditioners, the conventional evaluation dimensions are mainly cooling and heating. Cooling includes cooling effect, cooling rate, and uniformity of temperature distribution in the car.

The existing technology generally tests the cooling and heating effects of air conditioners, as well as the power consumption per 100 kilometers of air conditioners in the whole vehicle. However, on the one hand, due to the special energy consumption characteristics of pure electric vehicles and power batteries, the air conditioning energy consumption at low temperatures accounts for a relatively high proportion of the energy consumption of the whole vehicle. For this reason, the air conditioning performance of pure electric vehicles at low temperatures has received more extensive attention from the industry; on the other hand, compared with the existing technology, only the power consumption value of the air conditioner can be tested, but it is impossible to test how much energy is saved relative to the industry average. Based on this, there is an urgent need for a test method for the energy saving of air conditioners at low temperatures to determine the relative performance of the air conditioner in the industry.

Summary of the invention

In view of the above problems, the present invention proposes a test method and device for the air conditioning energy saving at low temperatures applied to pure electric passenger vehicles, so as to test the energy consumption performance of vehicle air conditioning in the industry through a set of standardized devices and methods.

In a first aspect, the present invention provides a method for testing the energy saving of air conditioning at low temperature for a pure electric passenger car, comprising:

S110, performing pre-test preparation of the vehicle to be tested, placing the vehicle on a chassis dynamometer, and connecting a data acquisition system, an electric quantity measuring device, and a temperature measuring device;

S120, performing vehicle immersion in a prescribed low-temperature environment based on the temperature measuring device;

S130, using the data acquisition system and the power measurement device, respectively testing the vehicle power consumption and driving range of the vehicle with the air conditioner turned on and turned off, to obtain a first power consumption and low-temperature driving range when the air conditioner is turned on, and a second power consumption when the air conditioner is turned off;

S140, obtaining the amount of energy saving of air conditioning at low temperature compared with the industry average level according to the difference between the first power consumption and the second power consumption and the influencing factor;

Among them, the influencing factors include the frequency coefficient of use of the air conditioner, the performance evaluation value of the low-temperature driving range compared to the industry average level, and the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range.

Optionally, the method for calculating the usage frequency coefficient of the air conditioner includes:

The ratio of the duration of the vehicle air conditioner turning on the heating function to the total travel duration is counted as the usage frequency coefficient.

Optionally, the calculation method of the performance evaluation value of the low-temperature driving mileage compared to the industry average level includes:

Obtaining a normal temperature driving range of the vehicle at a normal temperature;

Determine the target driving range of the vehicle at low temperatures based on the industry-set ratio of normal temperature driving range to low temperature driving range;

A performance evaluation value of the low-temperature driving mileage compared to an industry average level is calculated based on the low-temperature driving mileage and the target driving mileage.

Optionally, the method for calculating the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range includes:

The power analyzer is used to test the energy difference at the air conditioning input end at low temperature and normal temperature under the CLTC condition of Chinese light-duty vehicle driving conditions;

Calculate the increase in low-temperature power of the air conditioner and the corresponding sub-attenuation rate of the low-temperature driving distance according to the energy difference and the low-temperature driving duration;

The influence coefficient is calculated according to the sub-attenuation rate and the total attenuation rate of the vehicle.

Optionally, obtaining the amount of energy saving of air conditioning at low temperature compared with the industry average level according to the difference between the first power consumption and the second power consumption and the influencing factor includes:

The difference between the first electric energy consumption and the second electric energy consumption is multiplied by various influencing factors to obtain the energy saving of air conditioning at low temperature compared with the industry average level.

Optionally, in S130, the data acquisition system and the power measurement device are used to test the vehicle power consumption and driving range of the vehicle under the conditions of turning on the air conditioner and turning off the air conditioner, respectively, including:

Set the ambient temperature of the test room as required;

Monitor the temperature at the vehicle cooling fan outlet during the test as the ambient temperature;

Pre-processing the vehicle in at least one cycle condition to put the vehicle in a hot engine state;

Using the data acquisition system and the power measurement device to determine whether the vehicle has entered the power balance mode and has the conditions to start the CS mode operation;

According to the passenger car test condition CLTC-P, the vehicle's complete energy consumption and driving range are tested with the air conditioner turned on and off respectively.

Optionally, the vehicle's entire electric energy consumption and driving range are tested, including:

A set of tests consists of a continuous test of turning the air conditioner on and off;

Perform at least 3 sets of tests, and each test meets the power balance requirements;

During the test, if the vehicle cannot manually shut down the air conditioner, it will be forced to shut down through the OBD port of the vehicle automatic diagnostic system.

In a second aspect, the present invention provides a test device for measuring the energy saving of air conditioning at low temperature for a pure electric passenger car, comprising:

Chassis dynamometer, data acquisition system, power measurement equipment, temperature measurement equipment and controller;

The chassis dynamometer is used to simulate the operating conditions of the vehicle;

The temperature measuring device is used to perform vehicle immersion in a specified low temperature environment;

The data acquisition system and the power measurement device are used to test the vehicle's power consumption and driving range under the conditions of turning on the air conditioner and turning off the air conditioner respectively;

The controller is used to turn on and off the air conditioner during the test to obtain a first power consumption and a low-temperature driving range when the air conditioner is turned on, and a second power consumption when the air conditioner is turned off; based on the difference between the first power consumption and the second power consumption and the influencing factor, the energy consumption saving of the air conditioner at low temperature compared with the industry average level is obtained;

Among them, the influencing factors include the frequency coefficient of use of the air conditioner, the performance evaluation value of the low-temperature driving range compared to the industry average level, and the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range.

Optionally, the temperature measuring device is used to collect the temperature at the air outlet of the vehicle cooling fan;

The controller adjusts the ambient temperature of the vehicle according to the temperature at the air outlet.

The present invention has the following technical effects:

(1) The current mainstream testing methods at home and abroad are to measure the heating performance, cooling performance and specific energy consumption value of the vehicle air conditioner, but cannot test how much energy it saves compared with the industry average. The present invention fills the gap in the energy-saving effect test of the air conditioner after installation, which is of pioneering significance.

(2) The test method and device provided by the present invention are based on a chassis dynamometer, a data acquisition system, a temperature measurement device and an electric quantity measurement device, and have low cost, simple test and strong universality.

(3) The present invention takes into account that the power consumption obtained through chassis dynamometer testing deviates from the actual power consumption. The power consumption obtained through testing is corrected by using the air conditioner usage frequency coefficient, the performance evaluation value of the low-temperature driving range compared to the industry average level, and the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range, thereby obtaining the air conditioner energy saving compared to the industry average level.

The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above description and other purposes, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments are specifically cited and described in detail as follows.

BRIEF DESCRIPTION OF THE DRAWINGS

Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

FIG1 is a flow chart of a method for testing air conditioning energy saving at low temperatures for a pure electric passenger vehicle provided by an embodiment of the present invention.

DETAILED DESCRIPTION

The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Example 1

The present invention proposes a test method for the energy saving of air conditioning at low temperature for pure electric passenger vehicles, which is suitable for testing the energy saving of a certain vehicle model after installing air conditioning compared with the industry average level. The present invention mainly selects a vehicle to be tested and uses the performance of the vehicle on a chassis dynamometer to obtain the test value of the energy saving. Referring to Figure 1, the method specifically includes the following steps:

S110, performing pre-test preparation of the vehicle to be tested, placing the vehicle on a chassis dynamometer, and connecting a data acquisition system, an electric quantity measuring device, and a temperature measuring device.

The vehicle to be tested may be any vehicle equipped with a vehicle air conditioner. The vehicle in this embodiment is a pure electric passenger car.

S110 mainly completes the steps of pre-test preparation and device installation. Specifically, it performs the following operations:

S111. The environmental requirements and parameters of the test room should comply with the regulations. For example, the average temperature of the environment should be within the range of (-7±3)°C, which is the low temperature environment of the present invention.

S112. Perform chassis dynamometer settings as required. The resistance setting of the chassis dynamometer shall be adjusted to simulate the vehicle's running condition on the road at -7°C. The adjustment may be based on the change in the road driving resistance determined at -7°C; or the resistance obtained by reducing the coasting time according to the driving resistance by 10% may be used as the alternative road driving resistance for setting.

S113. Discharge the rechargeable energy storage system (REESS) as required. During the REESS discharge, the test room temperature should remain relatively stable and should not be higher than 28°C.

S114, after the discharge is completed, the REESS is charged for the first time as required.

S115. Move the vehicle into the test room, place it on the chassis dynamometer, and connect the data acquisition system and the power measurement device. The power measurement device includes a voltage sensor and a current sensor. The power measurement device is connected to the vehicle battery and transmits the discharge voltage and current, as well as the charging voltage and current of the battery to the data acquisition system. The data acquisition system transmits the voltage and current to the controller.

S120: Based on the temperature measuring device, immerse the vehicle in a prescribed low-temperature environment.

Specifically, within 12 hours after the initial charging of REESS, the vehicle shall be immersed as required. Move the vehicle to the immersion room. If it passes through other temperature zones during the period, the duration should not exceed 10 minutes. The vehicle should be immersed in the specified environmental conditions for 12 hours to 15 hours with all windows closed. During the immersion period, the average ambient temperature per hour should be maintained within the range of (-7±3)℃, the instantaneous temperature should be maintained within the range of (-7±6)℃, and should not be outside (-7+3)℃ for 3 consecutive minutes. If the immersion room and the test room are not the same facility, the vehicle should be moved to the test room as soon as possible after the immersion. If it passes through other temperature zones during the period, the duration should not exceed 10 minutes.

S130. Using the data acquisition system and the power measurement device, test the vehicle's power consumption and driving range with the air conditioner turned on and off, respectively, to obtain a first power consumption and low-temperature driving range when the air conditioner is turned on, and a second power consumption when the air conditioner is turned off.

S130 includes the following operations:

S131. Set the ambient temperature of the test room as required and keep it within the range of (-7±3)℃.

S132. During the test, monitor the temperature at the vehicle cooling fan outlet as the ambient temperature. The ambient temperature should be the arithmetic mean of the test chamber temperature measured at fixed intervals of no more than 1 minute.

S133, pre-processing the vehicle for at least one cycle condition to put the vehicle in a hot engine state.

S134, using the data acquisition system and power measurement equipment to determine whether the vehicle has entered the power balance mode and is ready to start the CS mode. During pre-processing, the REESS current and voltage are measured synchronously, and the power balance state is calculated. When the relative power change REECC is less than 0.04, the vehicle enters the power balance mode and is ready to start the CS (power retention) mode.

S135. According to the passenger car test condition CLTC-P, the vehicle's whole vehicle power consumption and driving range are tested with the air conditioner turned on and off respectively. The test is specifically conducted in accordance with the Chinese Passenger Car Driving Condition (CLTC-P) specified in 4.3 of GB/T19233-2020.

A set of tests consists of a continuous test of turning the air conditioner on and off; perform at least 3 sets of tests, and each test meets the power balance requirements specified in GB/T 18386.1; during the test, if the vehicle's air conditioner cannot be manually turned off, it is forced to be turned off through the OBD port of the vehicle's automatic diagnostic system.

During the test, the first power consumption when the vehicle's air conditioning is turned on is recorded, and the second power consumption when the vehicle's air conditioning is turned off is recorded. The vehicle's driving range at low temperatures when the air conditioning is turned on (called low-temperature driving range) and the time t required for the vehicle's interior temperature to reach 23 degrees Celsius are recorded.

The test results of the air conditioner on and off shall be tested for repeatability according to GB/T 18386.1. If the repeatability test is passed, the average of the three test results shall be calculated as the first/second power consumption when the vehicle air conditioner is on and off. If the first power consumption test in the on state fails to pass the repeatability test, the average of the two test results with the higher first power consumption shall be used as the first power consumption when the vehicle air conditioner is turned on.

S140. Obtain the amount of energy saved by air conditioning at low temperature compared to the industry average level based on the difference between the first power consumption and the second power consumption and the influencing factor.

The influencing factors include the frequency coefficient of the air conditioner, the performance evaluation value of the low-temperature driving range compared to the industry average level, and the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range. Referring to formula (1), the difference between the first power consumption and the second power consumption is multiplied by each influencing factor to obtain the energy saving of the air conditioner at low temperature compared to the industry average level.

; (1)

Among them, ECt is the electricity consumption per 100 kilometers saved by the vehicle's air conditioning energy consumption at low temperatures compared to the industry average, in kWh/100km. EC _off is the electricity consumption per 100 kilometers when the vehicle's air conditioning is turned off at low temperatures, in kWh/100km, that is, the second electric energy consumption. EC _on is the electricity consumption per 100 kilometers when the vehicle's air conditioning is turned on at low temperatures, in kWh/100km, that is, the first electric energy consumption.

_K1 is the frequency coefficient of air conditioning, which represents the daily frequency of use of this configuration function. The higher the frequency of use, the higher the energy saving. Optionally, the ratio of the duration of the vehicle air conditioning turning on the heating function to the total travel time is counted as the frequency coefficient. The frequency coefficient has a value range of 0~1, and it is assumed that the vehicle takes a value of 0.3. Then, (EC _on -EC _off )× _K1 is the power consumption per 100 kilometers of the vehicle air conditioning at low temperature after correction based on the consumer's frequency of use.

Due to the special energy consumption characteristics of pure electric vehicles and power batteries, the air conditioning energy consumption at low temperatures accounts for a high proportion of the energy consumption of the whole vehicle. In cold environments, traditional heating elements (such as PTC heaters) cause the endurance of electric vehicles to drop significantly due to high energy consumption. In order to solve this problem, the industry has begun to use heat pump systems as more efficient heat sources to achieve high-efficiency thermal management under low temperature conditions. Heat pump air conditioners are closely integrated with the thermal management system of the whole vehicle, and the air conditioning system will also provide energy for battery heating at low temperatures. Therefore, when evaluating the energy consumption performance of a pure electric passenger car air conditioner, it is especially necessary to reflect the attenuation rate of the low-temperature driving range relative to the normal temperature driving range, which is clearly perceived by consumers. The better the air conditioning performance of a pure electric vehicle at low temperatures, the higher the driving range, and the lower the energy consumption required for heating in low-temperature environments. Therefore, when the industry average level of air conditioning energy consumption cannot be obtained, the present invention creatively introduces the performance evaluation value of the driving range compared to the industry average level into the test of the energy saving of the air conditioner compared to the industry average level.

is the vehicle's low-temperature driving range, and BER is the vehicle's normal-temperature driving range. In the performance evaluation value of the low-temperature driving range compared to the industry average, the industry average refers to the average level that the low-temperature driving range should reach. The contribution to the achievement of low-temperature driving range is based on the provisions of GB 22757.1-2023 "Light Vehicle Energy Consumption Labeling Part 2: Externally Rechargeable Hybrid Electric Vehicles and Pure Electric Vehicles", and proposes to use the current average decrease rate of driving range under low temperatures (the proportion of the decrease in low-temperature driving range relative to the normal-temperature driving range) industry level of 40% as a benchmark, that is, 0.6× BER represents the average level of low-temperature driving range that should be achieved, and the low-temperature driving range actually measured for the whole vehicle is By comparing with the target driving range of 0.6× BER , the performance evaluation value of the vehicle's air conditioning energy consumption compared with the industry average is obtained.

In the specific calculation, the normal temperature driving range BER of the vehicle at normal temperature is first obtained, which can be obtained by querying the parameters of the automobile product certification announcement published by the national regulatory authorities. Then, based on the industry-set ratio of normal temperature driving range to low temperature driving range of 0.6, the target driving range of the vehicle at low temperature is determined to be 0.6× BER ; finally, based on the low temperature driving range and the target driving range, the performance evaluation value of the low temperature driving range compared to the industry average is calculated. , when the performance evaluation value is greater than 1, it means that the vehicle model's low temperature mileage performance is better than the industry average. To measure the performance of the vehicle's low-temperature mileage compared to the industry average.

_K2 is the influence coefficient of air conditioning on low-temperature driving range attenuation. In other words, it is the weight/contribution of the vehicle air conditioning on the low-temperature driving range attenuation rate relative to the normal-temperature driving range attenuation rate. Based on the battery energy flow analysis, the key indicators that affect the low-temperature driving range attenuation rate include air conditioning energy consumption, driving resistance, battery available power change, and energy recovery. In low-temperature environments, air conditioning energy consumption will increase (for heating and heating the battery), which becomes an important factor affecting the low-temperature attenuation of driving range, and _K2 measures the degree of influence of air conditioning on the low-temperature driving range attenuation.

When calculating K ₂ , the energy difference △ _EDCDC (unit: kWh) at the air conditioner input terminal (i.e., the input terminal of the DC converter DCDC to the air conditioner) at low temperature and normal temperature is first tested by a power analyzer under the Chinese light vehicle driving condition CLTC. Then, according to the energy difference and the low-temperature cruising time, the increase in low-temperature power of the air conditioner and the corresponding sub-attenuation rate of the low-temperature driving range are calculated; wherein, the energy difference △ _EDCDC (kWh) is divided by the low-temperature cruising time _TLT (h), and the increase in low-temperature power of the air conditioner _PLV (kW) = △ _EDCDC / _TLT is calculated, and the corresponding mileage attenuation rate (%) = △ _EDCDC / _E1BCN ×14.48/R1×100. For example, it is calculated through test data that the power of the vehicle's air conditioner at low temperature is increased by 0.39kW compared to normal temperature, and the corresponding driving range attenuation rate (called sub-attenuation rate) is 12.9%. Among them, the constant 14.48 is the total mileage of a single CLTC cycle, in km. The normal temperature driving range R1 test refers to the pure electric vehicle driving range and economy test specification "GBT18386.1-2021 Electric Vehicle Energy Consumption and Driving Range Test Method", and is tested on a rotating hub test bench. The test conditions are 23°C, the air conditioner is not turned on, and the vehicle's normal temperature driving range R1 is obtained by the test. The net discharge of a single CLTC cycle battery at normal temperature is measured to be E _1BCN (unit: kWh).

Finally, the influence coefficient is calculated according to the sub-attenuation rate and the total attenuation rate of the vehicle. The total attenuation rate here is obtained by (normal temperature driving mileage - low temperature driving mileage) / normal temperature driving mileage of the vehicle. The sub-attenuation rate is divided by the total attenuation rate to obtain the influence coefficient.

According to current industry research results, air conditioning energy consumption includes two parts: the high-pressure load of the heat pump compressor and the low-pressure load of the air conditioning. Based on the whole vehicle test of ordinary heat pump automobile air conditioners, it is evaluated that the influence coefficient of automobile air conditioning energy consumption on the low-temperature endurance attenuation rate is between 30% and 35%, which can be taken as 0.3 in the present invention. The weight of the contribution of automotive air conditioning to the improvement of low-temperature driving range performance compared to the industry average (i.e., the low-temperature driving range attenuation rate is 40%).

The embodiments of the present invention have the following technical effects:

(1) The current mainstream testing methods at home and abroad are to measure the heating performance, cooling performance and specific energy consumption value of the vehicle air conditioner, but cannot test how much energy it saves compared with the industry average. The present invention fills the gap in the energy-saving effect test of the air conditioner after installation, which is of pioneering significance.

(2) The test method and device provided by the present invention are based on a chassis dynamometer, a data acquisition system, a temperature measurement device and an electric quantity measurement device, and have low cost, simple test and strong universality.

(3) The present invention takes into account that the power consumption obtained through chassis dynamometer testing deviates from the actual power consumption. The power consumption obtained through testing is corrected by using the air conditioner usage frequency coefficient, the performance evaluation value of the low-temperature driving range compared to the industry average level, and the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range, thereby obtaining the air conditioner energy saving compared to the industry average level.

Example 2

The present invention also provides a test device for the energy saving of air conditioning at low temperature for pure electric passenger vehicles, comprising: a chassis dynamometer, a data acquisition system, an electric quantity measuring device, a temperature measuring device and a controller;

The chassis dynamometer is used to simulate the operating conditions of the vehicle;

The temperature measuring device is used to perform vehicle immersion in a specified low temperature environment;

The data acquisition system and the power measurement device are used to test the vehicle's power consumption and driving range under the conditions of turning on the air conditioner and turning off the air conditioner respectively;

The controller is used to turn on and off the air conditioner during the test to obtain a first power consumption and a low-temperature driving range when the air conditioner is turned on, and a second power consumption when the air conditioner is turned off; based on the difference between the first power consumption and the second power consumption and the influencing factor, the energy consumption saving of the air conditioner at low temperature compared with the industry average level is obtained;

Among them, the influencing factors include the frequency coefficient of use of the air conditioner, the performance evaluation value of the low-temperature driving range compared to the industry average level, and the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range.

Optionally, the device also includes: a temperature measuring device for collecting the temperature at the air outlet of the vehicle cooling fan; a controller for adjusting the ambient temperature of the vehicle according to the temperature at the air outlet to keep the ambient temperature within the range of (-7±3)°C.

The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims (9)

1. The method for testing the energy consumption conservation quantity of the air conditioner at low temperature applied to the pure electric passenger car is characterized by comprising the following steps of:

S110, preparing the vehicle to be tested before testing, placing the vehicle on a chassis dynamometer, and connecting a data acquisition system, an electric quantity measuring device and a temperature measuring device;

s120, performing vehicle dipping of the vehicle in a specified low-temperature environment based on the temperature measuring equipment;

s130, testing the whole vehicle electric energy consumption and the driving range of the vehicle under the conditions of opening and closing the air conditioner by utilizing the data acquisition system and the electric quantity measuring equipment so as to obtain a first electric energy consumption and a low-temperature driving range when the air conditioner is opened and a second electric energy consumption when the air conditioner is closed;

s140, obtaining the energy consumption of the air conditioner at low temperature to be compared with the average energy consumption of the industry according to the difference value of the first energy consumption and the second energy consumption and the influence factor;

The influence factors comprise the use frequency coefficient of the air conditioner, a performance evaluation value of the low-temperature driving range compared with the average industry level and the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range.

2. The method for testing the energy consumption conservation amount of the air conditioner at the low temperature applied to the pure electric passenger car according to claim 1, wherein the method for calculating the use frequency coefficient of the air conditioner comprises the following steps:

And counting the proportion of the time length of the vehicle air conditioner starting the heating function relative to the total travel time length, and taking the proportion as a use frequency coefficient.

3. The method for testing the energy consumption conservation amount of the air conditioner at the low temperature applied to the pure electric passenger car according to claim 1, wherein the method for calculating the performance evaluation value of the low-temperature driving range compared with the industry average level comprises the following steps:

acquiring a normal-temperature driving range of the vehicle in a normal-temperature state;

Determining a target driving range reached by the vehicle at low temperature according to an industry set proportion value of normal-temperature driving range and low-temperature driving range;

and calculating a performance evaluation value of the low-temperature driving range compared with the industry average level according to the low-temperature driving range and the target driving range.

4. The method for testing the energy consumption conservation quantity of the air conditioner at the low temperature applied to the pure electric passenger car according to claim 1, wherein the method for calculating the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range comprises the following steps:

The energy difference value of the air conditioner input end at low temperature and normal temperature under the CLTC working condition of the driving working condition of the Chinese light automobile is tested by a power analyzer;

Calculating the low-temperature power increment of the air conditioner and the sub attenuation rate of the corresponding low-temperature driving range according to the energy difference and the low Wen Xuhang time length;

And calculating the influence coefficient according to the sub attenuation rate and the total attenuation rate of the vehicle.

5. The method for testing the energy consumption conservation amount of the air conditioner at the low temperature applied to the pure electric passenger car according to claim 1, wherein the step of obtaining the energy consumption conservation amount of the air conditioner at the low temperature compared with the industry average level according to the difference value between the first energy consumption amount and the second energy consumption amount and the influence factor comprises the following steps:

And multiplying the difference value of the first electric energy consumption and the second electric energy consumption by each influence factor to obtain the energy consumption of the air conditioner at low temperature, which is compared with the average energy consumption of the industry.

6. The method for testing the energy consumption conservation amount of the air conditioner at the low temperature applied to the pure electric passenger car according to claim 1, wherein the step S130 is characterized in that the data acquisition system and the electric quantity measurement device are used for testing the electric energy consumption amount and the driving range of the whole car under the condition of opening the air conditioner and closing the air conditioner respectively, and the method comprises the following steps:

setting the environmental temperature of a laboratory according to requirements;

monitoring the temperature at the vehicle cooling fan outlet during the test as an ambient temperature;

Preprocessing at least one circulation working condition of the vehicle to enable the vehicle to be in a heat engine state;

judging that the vehicle enters an electric quantity balance mode by using the data acquisition system and the electric quantity measurement equipment, and having the condition of starting CS mode operation;

And testing the whole vehicle electric energy consumption and the driving mileage of the vehicle under the conditions of opening and closing the air conditioner according to the test working condition CLTC-P of the passenger vehicle.

7. The method for testing the energy consumption conservation amount of the air conditioner at the low temperature applied to the pure electric passenger car according to claim 6, wherein the method for testing the whole car energy consumption amount and the driving range of the car comprises the following steps:

A group of tests consists of one continuous test of opening and closing the air conditioner;

performing at least 3 sets of tests, each test meeting the power balance requirement;

In the testing process, if the vehicle cannot manually close the air conditioner, the vehicle is connected to the OBD port of the on-board automatic diagnosis system to be closed forcibly.

8. Be applied to test device of air conditioner energy consumption festival volume under pure electric passenger car's low temperature, characterized in that includes: chassis dynamometer, data acquisition system, electric quantity measuring equipment, temperature measuring equipment and controller;

the chassis dynamometer is used for simulating the running condition of a vehicle;

The temperature measuring device is used for executing the vehicle dipping of the vehicle in a specified low-temperature environment;

The data acquisition system and the electric quantity measuring device are used for testing the whole vehicle electric energy consumption and the driving range of the vehicle under the conditions of opening and closing the air conditioner respectively;

The controller is used for starting the air conditioner and closing the air conditioner in the test process so as to obtain a first electric energy consumption and a low-temperature driving range when the air conditioner is started and a second electric energy consumption when the air conditioner is closed; according to the difference value of the first electric energy consumption and the second electric energy consumption and the influence factor, obtaining the energy consumption of the air conditioner at low temperature, which is compared with the average energy consumption of the industry;

The influence factors comprise the use frequency coefficient of the air conditioner, a performance evaluation value of the low-temperature driving range compared with the average industry level and the influence coefficient of the air conditioner on the attenuation of the low-temperature driving range.

9. The apparatus of claim 8, wherein the temperature measurement device is configured to collect a temperature at an outlet of a cooling fan of the vehicle;

And the controller adjusts the environment temperature of the vehicle according to the temperature of the air outlet.