"2.9L fuel consumption" is controversial! BYD's vice president responded: NEDC evaluation is closer to the actual working conditions in China, Geely does not evaluate

National Business Daily

2024-05-30 19:37Published on the official account of Sichuan Daily Economic News

Reporter: Dong Tianyi Intern reporter: Liu Xi Editor: Pei Jianru

On May 28, the BYD Qin L DM-i was officially launched. According to the official introduction, thanks to the fifth-generation DM technology platform engine equipped with the highest thermal efficiency of 46.06% on the new car, the Qin L DM-i has a fuel consumption of only 2.9L per 100 kilometers NEDC and a comprehensive cruising range of more than 2,100 kilometers.

Since then, some netizens have questioned that BYD's fuel consumption data does not adopt the WLTC test standard. In this regard, Yang Dongsheng, senior vice president of BYD Group and chief designer of DM technology, publicly responded: "NEDC (that is, the European endurance test standard) is relatively more scientific to evaluate fuel consumption, and it is a working condition that is closer to the people. ”

Geely Automobile said in an interview with the reporter of "Daily Economic News": "We do not make any comments on netizens' reports of BYD (2.9L fuel consumption). But for Geely, it's about sticking to the right things and the real things. ”

According to the information published by the Ministry of Industry and Information Technology, among the different versions of the Qin L DM-i model, the 60-kilometer pure electric range model has a fuel consumption of 3.8L per 100 kilometers, the 90-kilometer pure electric range model has a fuel consumption of 3.98L per 100 kilometers, and the 116-kilometer pure electric range model has a fuel consumption of 4.17L per 100 kilometers. According to BYD's introduction, the fuel consumption of the Qin L DM-i model is 2.9L per 100 kilometers NEDC loss, which is different from the WLTC test result of the Ministry of Industry and Information Technology.

Image source: Courtesy of the company

In this regard, Yang Dongsheng told the "Daily Economic News" reporter that the average speed of NEDC is 33km/h, and when the Ministry of Industry and Information Technology requires the working conditions to be upgraded to WLTC, the average speed is 47km/h. However, BYD found that the average speed in major first-tier cities is 25km/h, or even 23km/h, and in second-tier cities, it is also above 30km/h. In China, the normal driving speed is less than 30km. "Fuel consumption is important when judging a car's performance, but the driving experience and vehicle configuration should not be overlooked." Yang Dongsheng thinks.

In response to this matter, Yang Xueliang, senior vice president of Geely Holdings, also expressed his views on social media. He reposted a blogger's question about BYD and commented: "I feel really good, I guess the older generation of scientists will think the same way if they are alive." ”

Fuel efficiency has always been one of the important metrics to measure vehicle performance. The main question of netizens about BYD this time is that between the two fuel consumption measurement methods of WLTC and NEDC, the former should be used.

NEDC is the European endurance test standard, the latest version is the 1997 version, which is divided into two parts: urban and suburban conditions. The urban operating conditions consisted of four ECE cycle units, with a maximum speed of 50 km/h and an average speed of 19 km/h during the test, each cycle time of 195 seconds, with a total distance of 4.052 km. The suburban test has a total of one EUDC cycle, with an average speed of 62.6km/h, an effective driving time of 400s, and a total distance of 6.955km.

The NEDC condition is in a constant driving condition most of the time, and even in the process of acceleration and deceleration, the acceleration is constant, and the "speed-time" curve is very regular, which belongs to the category of steady-state conditions.

WLTC is the global unified light vehicle test cycle, which is mainly based on the actual driving conditions of vehicles in Europe, the United States, Japan, South Korea and India, and involves a large amount of data of M1, M2 and N1 vehicles in different road types and different driving conditions, so its driving cycle is closer to the actual driving conditions.

Compared with the NEDC standard, the simulation scenarios of the WLTP standard are more complex, and are divided into four speeds: low-speed, medium-speed, high-speed, and ultra-high-speed, with maximum speeds of 56.5km/h, 76.6km/h, 97.4km/h, and 131.3km/h, respectively. The four speeds correspond to three scenarios: urban, high-speed, and rural, which can cover a more realistic driving environment.

According to public information, from July 1, 2021, the mandatory national standard (GB19578-2021) of the "Fuel Consumption Limits for Passenger Cars" approved and issued by the State Administration for Market Regulation and the Standardization Administration of the People's Republic of China, and formulated by the Ministry of Industry and Information Technology, has been officially implemented. It is mentioned that by 2025, the test conditions of traditional energy passenger cars and plug-in hybrid electric passenger cars in mainland China will be switched from NEDC to WLTC.

Image source: Ministry of Industry and Information Technology website

To this end, the mandatory national standard of "Fuel Consumption Limits for Passenger Cars" (GB19578-2021) carried out the collection of comparative data on fuel consumption under two working conditions, preliminarily analyzed the increase in fuel consumption after the switching of working conditions, and finally converted the fuel consumption limit of the model with the same intensity according to the impact of the switching of working conditions.

Regarding the controversy between the two fuel consumption measurement methods, Cui Dongshu, secretary general of the National Passenger Car Market Information Association, said in an interview with reporters: "Domestic consumers do not trust the fuel consumption marked by the company, because the vehicle fuel consumption provided by the car company under NEDC working conditions has a large deviation from the actual use of the data. The fuel consumption marked under the WLTC mode is closer to the real-life road conditions, thus enhancing the consumer experience. ”

In this regard, Wang Yao, assistant secretary general of the China Association of Automobile Manufacturers, believes that "the impact of the switch of test conditions is two-sided. From the consumer's point of view, the consumer has the right to know the fuel consumption standard that is closer to the facts. However, from the perspective of the automotive industry, consumers will feel that fuel consumption is relatively high, and they may choose more energy-efficient cars, which may have some impact on the sales of certain models."

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