CN-121996921-A - Light vehicle carbon dioxide emission evaluation method and system integrating multiple working conditions

CN121996921ACN 121996921 ACN121996921 ACN 121996921ACN-121996921-A

Abstract

The invention provides a method and a system for evaluating carbon dioxide emission of a light vehicle under comprehensive multiple working conditions, wherein the method comprises the steps of obtaining light vehicle basic information under WLTC working conditions, CLTC working conditions and RDE working conditions, wherein the basic information comprises vehicle speed, gradient and corresponding carbon dioxide emission, preprocessing the basic information, calculating dynamic specific power based on preprocessed data, calculating weight of the carbon dioxide emission corresponding to the dynamic specific power by adopting an improved principal component analysis method, and comprehensively evaluating the carbon dioxide emission of the light vehicle based on the weight. The invention accurately reflects the relation between the running state and the emission of the vehicle by calculating the dynamic specific power, determines the weight by using a principal component analysis method, scientifically and comprehensively combines the multi-station data, realizes the advantage complementation by combining the multi-station data, can comprehensively consider the emission of the vehicle under different scenes, and provides a more accurate and reliable method for evaluating the carbon dioxide emission of the light vehicle, and the assisting, emission reduction and emission control are realized.

Inventors

LIU MING
MA YI
HU JUN
XU HUALONG
Xie Siyou
CHEN XINGXIAN
Xiang zhuang
CHEN SHENG
GONG BAOLI
WANG KUN

Assignees

中国汽车工程研究院股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250530

Claims (10)

1. The method for evaluating the carbon dioxide emission of the light vehicle under the comprehensive multiple working conditions is characterized by comprising the following steps of: Acquiring basic information of a light vehicle under a WLTC working condition, a CLTC working condition and an RDE working condition, wherein the basic information comprises vehicle speed, gradient and corresponding carbon dioxide emission; Preprocessing the basic information, and calculating dynamic specific power based on the preprocessed data; And calculating the weight of the carbon dioxide emission amount corresponding to the dynamic specific power by adopting an improved principal component analysis method, and comprehensively evaluating the carbon dioxide emission of the light vehicle based on the weight.
2. The method for evaluating carbon dioxide emission of a light vehicle under multiple comprehensive working conditions according to claim 1, wherein the WLTC working conditions and the CLTC working conditions are laboratory working conditions, and the RDE working conditions are actual road working conditions; The basic information of the WLTC working conditions comprises 4 speed sections of a middle-low speed section, a middle speed section, a high speed section and an ultra-high speed section and corresponding average emission amounts of CO 2 ; the basic information of the CLTC working condition comprises 3 speed sections of a low speed section, a medium speed section and a high speed section and corresponding average emission of CO 2 ; The basic information of the RDE working condition comprises 3 speed sections of a middle speed section, a low speed section and a high speed section, gradient information and corresponding average emission of CO 2 .
3. The method for evaluating carbon dioxide emission of a light vehicle under multiple comprehensive working conditions according to claim 1, wherein the preprocessing comprises the steps of performing correction, abnormal data rejection and missing data interpolation processing on basic information data.
4. The method for evaluating carbon dioxide emissions of a light vehicle under multiple comprehensive operating conditions according to claim 1, wherein the dynamic specific power is specifically as for the RDE operating conditions: Wherein v is the vehicle speed, a is the acceleration, θ is the gradient, a is the windward area, ρ is the air density, C d is the air resistance coefficient, C r is the rolling resistance coefficient, and m is the vehicle mass; for WLTC and CLTC conditions: VSP 2 ＝v[1.1a+0.132]+0.000302v 3 Where v is the vehicle speed and a is the acceleration.
5. The method for evaluating carbon dioxide emissions of a light vehicle under multiple comprehensive operating conditions according to claim 1, wherein the improved principal component analysis method specifically comprises: carrying out standardized processing on data subjected to pretreatment under WLTC, CLTC, RDE working conditions corresponding to dynamic specific power; Measuring the partial correlation among the variables through KMO test, judging whether the correlation coefficient matrix is an identity matrix or not by utilizing Bartlett sphericity test, and if the test correlation is larger than a preset threshold, carrying out principal component analysis; calculating correlation coefficients among the standardized data variables to obtain a correlation coefficient matrix; Performing eigenvalue decomposition on the correlation coefficient matrix to obtain eigenvalues and corresponding eigenvectors, wherein the eigenvalues represent the contribution degree of the principal component to the variance; determining the number of principal components according to the magnitude of the characteristic value and the accumulated variance contribution rate; Calculating the variance contribution rate and the accumulated variance contribution rate of each principal component, and generating a variance interpretation rate table; And taking the variance contribution rate of each main component as a weight, and calculating the weight of the original variable in the comprehensive evaluation by combining the coefficient of the original variable on each main component to obtain a linear combination coefficient and a weight result.
6. A light vehicle carbon dioxide emissions evaluation system integrating multiple operating conditions, comprising: The basic information acquisition module is configured to acquire basic information of the light vehicle under a WLTC working condition, a CLTC working condition and an RDE working condition, wherein the basic information comprises vehicle speed, gradient and corresponding carbon dioxide emission; the specific power calculation module is configured to preprocess the basic information and calculate dynamic specific power based on preprocessed data; And the comprehensive evaluation module is configured to calculate the weight of the dynamic specific power corresponding to the carbon dioxide emission amount by adopting an improved principal component analysis method, and comprehensively evaluate the carbon dioxide emission of the light vehicle based on the weight.
7. The integrated multi-condition light vehicle carbon dioxide emission assessment system of claim 6, wherein said WLTC conditions and CLTC conditions are laboratory conditions and RDE conditions are actual road conditions; The basic information of the WLTC working conditions comprises 4 speed sections of a middle-low speed section, a middle speed section, a high speed section and an ultra-high speed section and corresponding average emission amounts of CO 2 ; the basic information of the CLTC working condition comprises 3 speed sections of a low speed section, a medium speed section and a high speed section and corresponding average emission of CO 2 ; The basic information of the RDE working condition comprises 3 speed sections of a middle speed section, a low speed section and a high speed section, gradient information and corresponding average emission of CO 2 .
8. The integrated multi-regime light vehicle carbon dioxide emissions assessment system of claim 6, wherein the dynamic specific power is specific to RDE regime: Wherein v is the vehicle speed, a is the acceleration, θ is the gradient, a is the windward area, ρ is the air density, C d is the air resistance coefficient, C r is the rolling resistance coefficient, and m is the vehicle mass; for WLTC and CLTC conditions: VSP 2 ＝v[1.1a+0.132]+0.000302v 3 Where v is the vehicle speed and a is the acceleration.
9. A computer readable storage medium having stored thereon a computer program, wherein the program when executed by a processor performs the steps of a method for evaluating carbon dioxide emissions of a light vehicle under integrated multiple operating conditions according to any one of claims 1-5.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the program, performs the steps of a method for evaluating carbon dioxide emissions of a light vehicle integrating multiple operating conditions as claimed in any one of claims 1 to 5.

Description

Light vehicle carbon dioxide emission evaluation method and system integrating multiple working conditions Technical Field The invention relates to the technical field of carbon emission evaluation, in particular to a method and a system for evaluating carbon dioxide emission of a light vehicle under comprehensive multiple working conditions. Background At present, in the aspect of evaluation of carbon dioxide emission of light vehicles, the problems of comprehensive utilization and accurate evaluation of multi-station data are mainly faced. In the prior art, the global unified light vehicle test cycle (WLTC) is widely applied to light vehicle chassis dynamometer experiments, but the WLTC is used for setting working conditions based on certain general standards. The currently developed Chinese light vehicle test cycle (CLTC) is more suitable for the actual domestic situation, is the same as WLTC as a laboratory working condition, has the advantages of controllable environment and traffic conditions and acceptable repeated test deviation, but is difficult to comprehensively reflect the emission condition of the light vehicle in actual running by only depending on the two laboratory working conditions. Actual road emission testing (RDE) can cover conditions in real environments, but its environment, traffic and road conditions are not controllable, resulting in very poor test repeatability. Meanwhile, the existing emission evaluation method lacks an effective pretreatment means when multi-working-condition data such as WLTC, CLTC, RDE are fused, abnormal data are difficult to remove accurately and missing data are difficult to process, and when the influence weight of each factor on the carbon dioxide emission under different working conditions is determined, the traditional method has limitations, the comprehensive effects of complex factors such as dynamic specific power and the like under the multi-working conditions cannot be fully considered, the accurate comprehensive evaluation on the carbon dioxide emission of the light vehicle is difficult to realize, and the increasingly strict environmental protection and industry development requirements cannot be met. Disclosure of Invention In order to solve the problems, the invention provides a comprehensive multi-working-condition light vehicle carbon dioxide emission evaluation method and system, which accurately reflect the vehicle running state and emission association by calculating dynamic specific power, and scientifically integrate multi-working-condition data by determining weights through a principal component analysis method. The method has the advantages that complementary advantages are realized by combining multiple working conditions, the emission of the vehicle in different scenes can be comprehensively considered, a more accurate and reliable method is provided for evaluating the carbon dioxide emission of the light vehicle, and the assistance and emission reduction control are realized. In order to achieve the above purpose, the present invention adopts the following technical scheme: In a first aspect, the present invention provides a method for evaluating carbon dioxide emissions of a light vehicle under multiple operating conditions, comprising: Acquiring basic information of a light vehicle under a WLTC working condition, a CLTC working condition and an RDE working condition, wherein the basic information comprises vehicle speed, gradient and corresponding carbon dioxide emission; Preprocessing the basic information, and calculating dynamic specific power based on the preprocessed data; And calculating the weight of the carbon dioxide emission amount corresponding to the dynamic specific power by adopting an improved principal component analysis method, and comprehensively evaluating the carbon dioxide emission of the light vehicle based on the weight. Preferably, the WLTC working condition and the CLTC working condition are laboratory working conditions, and the RDE working condition is an actual road working condition; The basic information of the WLTC working conditions comprises 4 speed sections of a middle-low speed section, a middle speed section, a high speed section and an ultra-high speed section and corresponding average emission amounts of CO 2; the basic information of the CLTC working condition comprises 3 speed sections of a low speed section, a medium speed section and a high speed section and corresponding average emission of CO 2; The basic information of the RDE working condition comprises 3 speed sections of a middle speed section, a low speed section and a high speed section, gradient information and corresponding average emission of CO 2. Preferably, the preprocessing comprises the steps of performing correction, abnormal data rejection and missing data interpolation processing on basic information data. Preferably, the dynamic specific power is specifically, for RDE working conditions: Wherein v is the vehicle speed,