CN112379193B - Method for testing system precision of simple transient working condition method - Google Patents
Method for testing system precision of simple transient working condition method Download PDFInfo
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- CN112379193B CN112379193B CN202011165936.1A CN202011165936A CN112379193B CN 112379193 B CN112379193 B CN 112379193B CN 202011165936 A CN202011165936 A CN 202011165936A CN 112379193 B CN112379193 B CN 112379193B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The invention relates to the technical field of detection, in particular to a method for testing the system precision of a simple transient working condition method. The method is characterized by taking a pure electric vehicle as a carrier for testing and used for testing the loading precision of the dynamometer resisting moment and the tail gas detection precision simultaneously. The method realizes that the difference between the actual output resisting moment and the target output resisting moment of the dynamometer can be obtained, meanwhile, the exhaust gas discharge data under the torque can also be obtained, whether the dynamometer is reasonably controlled is judged according to the magnitude of the torque input and output difference value, so that the detection precision of the VMAS system is accurately judged, and the accuracy of the overall measured data of the VMAS system is comprehensively checked.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a method for testing the system precision of a simple transient working condition method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
GB18285-2005 'limiting value and measuring method of automobile exhaust pollutants of spark ignition engine (double-idling method and simple operating mode method)' rule that automobile exhaust emission test by simple transient operating mode method is carried out on a chassis dynamometer, and a simple transient operating mode emission detection system (VMAS system) is a dynamic loading detection method and is used for collecting current Hydrocarbons (HC), nitrogen monoxide (NO), carbon monoxide (CO) and carbon dioxide (CO)2) Oxygen (O)2) And diluting the oxygen concentration and other data, calculating the exhaust tail gas, and further detecting whether the exhaust reaches the standard.
As shown in the following, the VMAS system comprises various working conditions such as acceleration, deceleration, idling, constant speed and the like in the detection process within 195s, and the detection result has better correlation with the actual condition. The VMAS system main equipment comprises: the device comprises a chassis dynamometer, an exhaust sampling system, a five-gas analyzer, a gas flowmeter and an automatic detection control system. The automobile chassis dynamometer mainly simulates various working conditions of road running by controlling a power absorption unit, and the Chinese standard adopts a light automobile chassis dynamometer with fixed reference inertia (900kg), so that the automobile chassis dynamometer has the advantages of simple structure and lower cost, and does not need to be operated by matching a flywheel. The exhaust sampling system comprises a water-gas separation system, a particle filtering device, a blower, a gas flow analyzer and the like; the five-gas analyzer directly samples and analyzes the discharged gas; the gas flow analyzer is mainly used for measuring the flow of the exhaust gas in real time, the gas flow analyzer compares the oxygen content of the measured and diluted gas with the oxygen content in the original exhaust gas to obtain a mass dilution ratio, and the exhaust volume per second is calculated through the dilution ratio and the flow measured by the gas flow analyzer. Then calculating the mass of the gas discharged by the automobile per second according to the discharge volume and the discharge concentration measured by the five-gas analyzer; the automatic detection control system automatically sets the loading load and selects the emission standard according to the input vehicle parameters.
Mass discharge (g/s) ═ exhaust concentration x exhaust density x exhaust flow (1)
Exhaust flow rate (diluted exhaust gas flow rate) x dilution ratio (2)
Dilution ratio (ambient air oxygen concentration-diluted gas oxygen concentration)/(ambient air oxygen concentration-original exhaust gas oxygen concentration) (3)
The chassis dynamometer loads a certain load according to vehicle information and the requirement of a cycle working condition, and the loading torque is obtained by calculation according to vehicle parameters and an automobile dynamics equation. Describing the real-time stress condition of the vehicle during road running based on the longitudinal dynamic equation of the vehicle during running of the vehicle, wherein the vehicle stress comprises rolling resistance FfAir resistance FwSlope resistance FiAnd acceleration resistance FjEstablishing a running equation of the vehicle stress and driving force FtIs represented as follows:
Ft＝Ff+Fw+Fi+Fj#(4)
in the formula (I), the compound is shown in the specification,
Ff＝Gfcosα#(6)
Fi＝Gsinα#(8)
in the formula, TtqIs the engine drive torque; i.e. igIs the transmission ratio of the gearbox; i.e. i0Is the rear axle transmission ratio; etatFor transmission efficiency; r is the wheel radius; g is the mass of the whole vehicle in unit kg; f is a rolling resistance coefficient; α is the ramp slope, which may not be considered in the Vmas system; cDSelecting the wind resistance coefficient according to the type of the vehicle; a is the windward area in m2(ii) a v is the speed of the vehicle, and the unit is km/h; δ is a rotating mass conversion factor.
The control of simulating the automobile road running resistance is realized by controlling the exciting current of the eddy current dynamometer by a computer, the control object of the system is the eddy current dynamometer, and the dynamic characteristic of the eddy current dynamometer refers to the response performance of the eddy current dynamometer to the step input voltage. The absorption torque of the eddy current dynamometer changes along with the increase and decrease of the exciting current of the exciting coil, and the control system realizes the loading of the dynamometer by adjusting the exciting current of the dynamometer. The lower graph shows the response characteristic of the eddy current dynamometer absorbing torque under a reference working condition, and because the eddy current dynamometer absorbs torque and has pure delay and slow response, a VMAS test working condition control system has high requirements on the dynamic tracking performance of the system, and the eddy current dynamometer has the problems of non-linear time variation, time lag, uncertainty and the like, the dynamometer is calibrated and tested only by static state, and the dynamometer system cannot be determined whether to apply the resistance torque required by the test working condition in real time according to the VMAS test working condition requirements.
Response characteristic of absorption torque of electric eddy current dynamometer
Meanwhile, in the exhaust emission process, the gas reaches the detection point and needs to pass through a long section of gas pipeline, so that the transient time consistency of the gas state of the measurement point and the actual gas state under the current engine operation condition is difficult to guarantee, and a certain hysteresis exists.
The inventors have discovered that existing methods for monitoring the accuracy of a VMAS system have focused primarily on the design of standard gas control devices to ensure that the flow requirements for accurately controlling standard gas are met. However, in the existing research work, whether the dynamometer can apply the required resistance torque according to the requirement in the formula (4) in the test process and the important influence of the synchronization of the engine working condition and the tail gas test result on the tail gas emission precision test are not realized, and how to test whether the VMAS system can achieve the national standard requirement, the correct application of the resistance torque on time and the guarantee of the synchronization of the engine working condition and the tail gas test result become the technical problems to be solved urgently.
Disclosure of Invention
In order to solve the defects of the prior art, the method aims to provide a method for testing the system precision of the simple transient working condition method, the method firstly realizes that the difference between the actual applied resisting moment of the dynamometer and the target resisting moment obtained by calculation according to the formula (4) is obtained, meanwhile, the actual tail gas emission data under the working condition can also be obtained, whether the dynamometer is properly controlled or not is judged according to the actually measured resisting moment and the target resisting difference, the detection precision of the VMAS system is accurately judged by combining the actual tail gas emission data, and the accuracy of the overall measured data of the VMAS system is comprehensively tested.
Specifically, the technical scheme of the present disclosure is as follows:
in the first aspect of the disclosure, a method for testing the system accuracy of a simple transient working condition method is used for testing, a pure electric vehicle is used as a carrier for testing, the pure electric vehicle is driven into a VMAS system, the loading torque of an accelerator pedal is controlled according to the testing working condition of the VMAS system so as to reach a set target rotating speed, a tail gas simulation system loaded on the electric vehicle is controlled, tail gas with known components and concentration is simulated and generated, and the output power, the vehicle speed and the simulated tail gas emission condition of the electric vehicle are calculated and recorded; and after the test cycle is finished, comparing the actual output power of the electric vehicle with the power absorbed by the dynamometer obtained by combining the roller rotating speed in a detection specification, and comparing the simulated tail gas component and the quality which are controlled and output according to the detection working condition with the gas component measured by the VMAS system, so as to simultaneously test the precision of the moment of resistance applied by the dynamometer and the tail gas detection precision.
In a second aspect of the disclosure, a detection system for testing system accuracy of a simple transient operating condition method comprises a pure electric vehicle, a standard gas simulation device and a dynamometer, wherein the standard gas simulation device and the pure electric vehicle realize data processing through a control line.
In a third aspect of the disclosure, an application of an inspection system for testing system accuracy of a simple transient operating condition method is provided.
One technical scheme in the disclosure has the following beneficial effects:
(1) the existing detection method completely ignores the important influence of the accuracy of the dynamically applied resisting moment of the dynamometer on the detection accuracy of the tail gas: if the dynamometer does not load the required resisting moment in real time according to time or the actually applied resisting moment is smaller than a set value calculated according to the vehicle type and the circulating working condition, the concentration of the tail gas detected by the VMAS system is far smaller than the concentration of the tail gas emission of the vehicle when the vehicle operates according to the standard, namely, the cheating phenomenon is caused due to the reduction of the detection precision of the VMAS system. However, the importance of the dynamics of the dynamometer applied resistive torque in verifying the accuracy of the VMAS system is not considered at all by the present research efforts. In order to solve the problems, the pure electric vehicle is used as a carrier to design a set of test system, the power and the rotating speed output by the electric vehicle can be detected in real time, the test system is used for verifying the accuracy of the exhaust emission data measured under the current vehicle running torque and the test accuracy of the test system, and the detection accuracy of the VMAS system is comprehensively and integrally evaluated.
(2) The system aims to generate simulated tail gas according to a circulation working condition, the simulated tail gas is used as standard gas for comparing test results, and the test precision and the data reliability of the system are evaluated by combining an actually measured torque value.
(3) The standard gas tank uses the simulation tail gas components which are configured in a certain proportion, the gas mixing proportion is controlled through the gas control system, the gas content is measured by using a five-gas analyzer, a gas flowmeter and the like of the VMAS system, and the standard gas is compared to obtain whether the measurement precision of the system measurement device meets the requirement or not.
(4) The current research work not only can not realize the inspection to dynamometer resistance moment dynamic loading precision and exhaust emissions measuring accuracy simultaneously, moreover, in order to accomplish above-mentioned a certain effect alone, all need carry out complicated testing process with the help of very complicated equipment, consume a large amount of manpower, material resources. In order to greatly improve the efficiency and reduce the cost, the effectiveness test of the VMAS system is simulated by the pure electric vehicle, the structure is very simple, in addition, a tester only needs to control an accelerator pedal according to a simple transient test working condition, the driving motor simulates the engine to output torque, and the current, the voltage and other data of the chassis dynamometer and the battery pack of the pure electric vehicle are recorded, so that the implementation is very convenient, and the manpower and the material resources are greatly saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Embodiments of the present disclosure are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic flow chart of a method for testing the system accuracy of the simple transient operating condition testing method in embodiment 1;
FIG. 2 is a schematic diagram of a system for testing the system accuracy of the simple transient operating condition method according to embodiment 1;
in the figure: the system comprises a gas storage tank 1, a blower 2, a gas filter 3, a pressure regulating valve 4, a storage buffer container 5, a high-precision electronic control proportional valve 6, a one-way valve 7, a gas pipeline 8, a heater 9, a humidifier 10, a mixed gas tank 11, a diluted gas tank 12, a VMAS system gas flowmeter 13, a tail gas post-processing device 14, a VMAS system five-gas analyzer 15, an electric automobile 16, a dynamometer 17, a control line 18 and a data processing terminal 19.
Detailed Description
The disclosure is further illustrated with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Any methods and materials similar or equivalent to those described herein can be used in the methods of the present disclosure. The preferred embodiments and materials described herein are intended to be exemplary only.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, the tail gas tested by the VMAS system has hysteresis, the testing precision cannot be guaranteed, and at present, there is no comprehensive method for detecting the precision of the VMAS system.
In one embodiment of the disclosure, a method for testing the system accuracy of a simple transient operating condition method comprises the steps of using a pure electric vehicle as a carrier for testing, driving the pure electric vehicle into a VMAS system, adjusting driving torque through an accelerator pedal according to the testing operating condition of the VMAS system, overcoming resistance torque to reach a set target rotating speed, controlling a tail gas simulation system loaded on the electric vehicle, simulating to generate tail gas with known components and concentration, and recording current, voltage, vehicle speed and simulated tail gas emission conditions output by a power battery of the electric vehicle; and after the test cycle is finished, calculating the power actually output by the electric vehicle according to the actually measured current and voltage, comparing the actual output power of the electric vehicle with the power which should be output by the electric vehicle according to the standard, and comparing the simulated tail gas component and quality which are controlled to be output with the gas component measured by the VMAS system, so as to simultaneously test the precision of the moment of resistance applied by the dynamometer and the tail gas detection precision.
In the VMAS detection system, the loading of the resisting moment of the dynamometer requires the quick response of the loading of the exciting current, but in practice, the exciting current has certain response delay, and whether the change process of the dynamic resistance can be simulated by system software is unknown, so that in order to verify whether the dynamometer is loaded with the resisting moment according to the formula (4) or whether the loading value meets the detection requirement, an electric automobile detection method is provided, and the loading condition of the dynamometer is contrastingly verified.
If the dynamometer does not load the required resisting moment in time according to the formula (4) or the actually applied resisting moment is smaller than a theoretical value, the concentration of the tail gas detected by the VMAS system is far smaller than the concentration of the actual automobile tail gas emission when the dynamometer is loaded according to the requirement, namely, the cheating phenomenon is caused due to the reduction of the detection precision of the VMAS system. However, existing research work does not consider at all the importance of the dynamic response and accuracy of dynamometer resistive torque loading in verifying accuracy of the VMAS system.
However, how to realize the overall accuracy test of the VMAS system has great difficulty in testing the loading accuracy of the dynamometer resistance moment and testing the exhaust emission accuracy. In the existing research, a method for singly calibrating a dynamometer by using complex equipment and a method for singly calibrating the detection precision of the exhaust gas by using the complex equipment are adopted, however, no research discloses the inventive concept of the present disclosure, and only from the present disclosure, the inventive breakthrough is made in the aspect of finding out the influence of the loading precision of the resistance moment of the dynamometer on the measurement precision of the exhaust emission. In addition, the present disclosure provides a very simple and efficient solution to the above-mentioned problems.
In one embodiment of the present disclosure, the inspection method includes: detecting the dynamic characteristic and precision of the applied resisting moment of the pure electric vehicle when the pure electric vehicle drives into the dynamometer; simulating tail gas components through standard gas in a gas tank, and controlling simulated tail gas emission by a controller according to the running state of the vehicle; and analyzing the tail gas test precision while analyzing the loading condition of the dynamometer.
And controlling the output torque of the electric vehicle by controlling an accelerator pedal by a driver according to the VMAS system test working condition.
Furthermore, the pure electric vehicle drives into the VMAS system, the driving wheels are arranged on the roller, the test is carried out according to the detection standard of the VMAS system, a driver operates an accelerator pedal of the pure electric vehicle according to the running condition of 195s, and the vehicle control unit sends the required torque to the motor controller through the calculation processing of the pedal information so as to control the output of the motor torque.
Specifically, according to a detection standard test of a VMAS system, a table is looked up in GB18352.5-2013 light automobile pollutant emission limit and measurement method to obtain relevant parameters such as relevant reference mass, equivalent inertia, road resistance coefficient and the like, the driving force required by the vehicle is obtained according to formula (4) and the change condition of the target vehicle speed, the driving moment is obtained according to the radius of wheels, and the loading running resistance of a dynamometer rack is controlled.
Further, the VMAS system collects the bus voltage and current signals of the battery pack and the motor rotating speed signals, then combines the motor efficiency and the transmission ratio of the speed reducer to calculate the actual output power of the vehicle, compares the actual output power with the loaded power of the dynamometer, verifies whether the dynamometer is loaded with a corresponding load or not, and simultaneously verifies the corresponding effect of the loading load of the dynamometer.
Furthermore, the high-precision electric control proportional valve is used for controlling the gas flow, controlling the standard gas to be mixed in the mixed gas tank according to a certain proportion, and heating, humidifying and stirring are carried out before the standard gas is mixed into the mixed gas tank, so that the tail gas state can be better simulated and the gas stratification can be prevented. Wherein the standard gas comprises Hydrocarbon (HC), nitrogen monoxide (NO), carbon monoxide (CO), and carbon dioxide (CO)2) Oxygen (O)2) Five gases and standard air.
Furthermore, the other side of the mixed gas tank is connected with a VMAS system five-gas analyzer and a dilution gas tank, and the VMAS system five-gas analyzer can realize CO2、CO、NO、O2And HC, directly measuring the components of the mixed gas by directly extending a sampling probe of a VMAS system five-gas analyzer into the container.
And taking the loaded power change rule and standard simulated tail gas obtained by control as reference, comparing the data measured in the VMAS system, verifying whether the dynamometer is loaded with a corresponding load, obtaining the dynamic characteristic and the loading value of the loading torque of the dynamometer system, simultaneously comparing the standard gas controlled under the current resisting torque and the gas state measured by the VMAS system, verifying the hysteresis effect of tail gas measurement, and evaluating the accuracy and the data reliability of the whole system.
In an embodiment of the disclosure, a detection system for testing system accuracy of a simple transient operating condition method comprises a pure electric vehicle, a standard gas simulation device and a dynamometer, wherein the standard gas simulation device and the pure electric vehicle realize data processing through a control line.
The dynamometer is arranged at the bottom of the pure electric vehicle, loads a certain load according to vehicle information and is used for simulating various working conditions of road running.
Further, the standard gas simulation device is formed by connecting a gas storage tank, a blower, a gas filter, a pressure regulating valve, a storage buffer container, a high-precision electric control proportional valve, a one-way valve, a gas pipeline, a heater, a humidifier, a mixed gas tank, a VMAS system five-gas analyzer, a dilution gas tank, a VMAS system gas flowmeter and a tail gas post-processing device in sequence, wherein the dilution gas tank and the VMAS system five-gas analyzer are connected with the mixed gas tank together, and the VMAS system gas flowmeter and the tail gas post-processing device are connected behind the dilution gas tank in sequence.
Further, the pure electric vehicle comprises a vehicle control unit, a battery, a motor and a control system thereof, and can monitor and store vehicle running state parameters in real time. The control system controls the standard gas simulation device to simulate a certain proportion of simulated tail gas components, collects and records gas release amount, and tests the gas release amount on the VMAS system.
The gas filter is a high-efficiency and easy-to-operate full-automatic filtering device, and the drift diameter of an inlet and an outlet of the gas filter is consistent with the caliber of a pipeline and is used for filtering standard gas impurities. Because the gas pressure in the gas tank is higher, the pressure reducer is used for reducing the pressure released in the gas tank, and simultaneously, a pressure sensor is arranged in the pressure reducer, so that the pressure sensor enters the gas storage container at a certain pressure, the pressure consistency of each standard gas is ensured, and the gas storage container is used as a buffer container for temporarily storing each standard gas.
The high-precision electric control proportional valve controls the opening proportion thereof through a control system, further controls the gas flow, and is installed for preventing gas backflow, the one-way valve controls the gas flow direction, respectively controls the flow of the five standard gases, so that the five standard gases are mixed in the mixed gas tank according to a certain proportion, and for simulating the tail gas state and preventing gas stratification, the mixed gas is heated, humidified and stirred before entering the mixed gas tank, the other side of the mixed gas tank is connected with the VMAS system five-gas analyzer and the dilution gas tank, and the VMAS system five-gas analyzer can realize CO analysis2、CO、NO、O2And HC, directly measuring the components of the mixed gas by directly extending a sampling probe of a VMAS system five-gas analyzer into the container.
The air blower sucks, compresses and discharges air to the system, the control system controls the air to be mixed with the mixed gas to obtain diluted gas, the diluted gas tank is used for storing the mixed gas simulating a certain dilution ratio, the other side of the dilution container is connected with a VMAS system gas flow analyzer, the VMAS system gas flow analyzer is used for measuring the flow of simulated exhaust gas, the mass of the simulated automobile per second emission is calculated by combining the dilution ratio and the measured content of each standard gas component, and the mass is compared with the accurately controlled data to obtain the precision of the simulated exhaust gas detection.
In one embodiment of the present disclosure, an application of a test system for testing system accuracy of a simple transient operating condition method is provided.
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific embodiments.
Example 1
As shown in fig. 1-2, the system accuracy of the simple transient operating condition method is tested, and the specific testing steps are as follows:
the electric automobile is driven into the VMAS detection system and connected with each detection instrument, a tester controls an accelerator pedal to output driving torque according to the target rotating speed of the VMAS system under the test working condition, meanwhile, the control system controls and simulates standard tail gas, an electric control proportional valve with a certain proportion is controlled and opened according to the emission mean value of a certain city single automobile, the amount of each released standard gas is further controlled, a corresponding test flow is completed within 195s, data in the system is collected, and the data are transmitted to a data center to be stored and processed.
The detection environment temperature is 25 ℃, the sampling frequency of the five-gas analyzer is 5Hz, the pressure of the flowmeter is 100.2KPa, the sampling frequency is 1Hz, the ambient oxygen concentration is 20.8%, the maximum bearing mass of the dynamometer is 10t, and the rated absorption power is 250 kw. Actual test value CO of single vehicle emission240.56g/km, 16.89g/km for CO, 1.26g/km for HC, NOXThe error is about 0.3%, 0.4%, 1.2% and 0.8% when the control data is compared and calculated, the curve of the dynamometer is compared and calculated with the voltage and the current of the electric automobile and the corresponding operation parameters of the motor, and the maximum error of the dynamometer in the circulation working condition is about 1.4%.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for testing the system precision of a simple transient working condition method is characterized by comprising the following steps: the method comprises the steps of taking a pure electric vehicle as a carrier for inspection, driving the pure electric vehicle into a VMAS system, controlling an accelerator pedal to enable a motor to output proper driving torque according to the VMAS system test condition so as to achieve a set target rotating speed, controlling a tail gas simulation system loaded on the electric vehicle, simulating and generating tail gas with known components and concentration, and recording the current, voltage, vehicle speed and simulated tail gas emission conditions output by a power battery of the electric vehicle; after the test cycle is finished, comparing the actual output power of the electric vehicle with the power which should be output by the electric vehicle according to the standard, and comparing the simulated tail gas component and the quality which are controlled to be output with the gas component measured by the VMAS system, and using the simulated tail gas component and the quality to simultaneously test the precision of the moment of resistance applied by the dynamometer and the tail gas detection precision;
the inspection method comprises the following steps: detecting the dynamic characteristic and precision of the applied resisting moment of the pure electric vehicle when the pure electric vehicle drives into the dynamometer; simulating tail gas components through standard gas in a gas tank, and controlling simulated tail gas emission by a controller according to the running state of the vehicle; analyzing the tail gas test precision while analyzing the loading condition of the dynamometer;
the VMAS system collects bus voltage and current signals of the battery pack and motor rotating speed and torque signals, then combines motor efficiency and reducer transmission ratio to calculate output power at a wheel, the output power is used as actual output power and is compared with the power loaded by the dynamometer to check whether the dynamometer is loaded with a corresponding load or not, and meanwhile, the corresponding effect of the loading load of the dynamometer is checked.
2. The method for testing the accuracy of the simple transient operating condition method system according to claim 1, wherein: the pure electric vehicle drives into the VMAS system, the driving wheels are arranged on the roller, the test is carried out according to the VMAS system detection standard, a driver operates the accelerator pedal of the pure electric vehicle according to the 195s driving working condition, the whole vehicle controller sends the required torque to the motor controller through the calculation processing of the pedal information, and then the motor torque output is controlled, and the target rotating speed is achieved.
3. The method for testing the accuracy of the simple transient operating condition method system according to claim 1, wherein: the high-precision electric control proportional valve is used for controlling the gas flow, controlling the standard gas to be mixed in the mixed gas tank according to a certain proportion, and heating, humidifying and stirring the mixed gas before the mixed gas enters the mixed gas tank so as to better simulate the tail gas state and prevent gas stratification.
4. The method for testing the accuracy of the simple transient operating condition method system according to claim 1, wherein: the other side of the mixed gas tank is connected with a VMAS system five-gas analyzer and a dilution gas tank, and the VMAS system five-gas analyzer can realize CO2、CO、NO、O2And HC, directly measuring the components of the mixed gas by directly extending a sampling probe of a VMAS system five-gas analyzer into the container.
5. A detection system for testing the accuracy of a simple transient operating condition method system, which implements the inspection method for testing the accuracy of a simple transient operating condition method system according to claims 1 to 4, characterized in that: the device comprises a pure electric vehicle, a standard gas simulation device and a dynamometer, wherein the standard gas simulation device and the pure electric vehicle realize data processing through a control line.
6. The system for testing the accuracy of the SIMS system according to claim 5, wherein: the standard gas simulation device is formed by connecting a gas storage tank, a blower, a gas filter, a pressure regulating valve, a storage buffer container, a high-precision electric control proportional valve, a one-way valve, a gas pipeline, a heater, a humidifier, a mixed gas tank, a VMAS system five-gas analyzer, a dilution gas tank, a VMAS system gas flowmeter and a tail gas post-processing device in sequence, wherein the dilution gas tank and the VMAS system five-gas analyzer are connected with the mixed gas tank together, and the VMAS system gas flowmeter and the tail gas post-processing device are connected behind the dilution gas tank in sequence.
7. The system for testing the accuracy of the SIMS system according to claim 5, wherein: the pure electric vehicle comprises a vehicle control unit, a battery, a motor and a control system of the motor, and can monitor and store vehicle running state parameters in real time, wherein the control system controls a standard gas simulation device to simulate a certain proportion of simulated tail gas components, collects and records gas release amount, and tests on a VMAS system.
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