Understanding the Concept of Negative Electric Vehicle Driving Range and Fuel Consumption on NEDC Introduction The NEDC or New European Driving Cycle is an important testing procedure that measures fuel consumption and carbon dioxide emissions from motor vehicles, including electric vehicles. The test simulates real-life driving conditions, which include urban driving and extra-urban driving modes. However, one issue affecting the accuracy and reliability of NEDC results is the phenomenon of negative electric vehicle driving range and fuel consumption. This article will explore the meaning of negative electric vehicle driving range and fuel consumption on NEDC and its implications. What is Negative Electric Vehicle Driving Range? Negative electric vehicle driving range occurs when a vehicle’s battery is not entirely charged, and the vehicle continues to run on its internal combustion engine in hybrid mode. In this case, the battery releases energy to power the electric motor for a short time, and the combustion engine takes over when the battery is empty. The result is that the electric range of the vehicle is negative, meaning it has exceeded zero and the vehicle is using more fuel than it theoretically could. Why Does Negative Electric Vehicle Driving Range Occur? There are several reasons for negative electric vehicle driving range. One reason is that the test is short, and the cars do not have time to recharge their batteries fully. Therefore, the battery is discharged sooner than it is expected to be, and the combustion engine comes online early in the test. Moreover, hybrid-electric cars are designed with several operating modes, including electric-only mode, hybrid mode, and engine-only mode. In hybrid mode, the car can use both the electric motor and combustion engine to power the car. If the battery reaches discharge sooner than it is supposed to, the car switches to engine-only operation to power the car. What Are the Implications of Negative Electric Vehicle Driving Range on NEDC? Negative electric vehicle driving range can affect the accuracy and reliability of the NEDC test results because it could lead to an overestimation of the vehicle's fuel efficiency and carbon dioxide emissions. Therefore, it presents a challenge for manufacturers of hybrid-electric vehicles who have to balance the fuel consumption and electric driving range to pass the NEDC test. For example, in NEDC tests, manufacturers can calibrate their vehicles to use the electric motor to power the car primarily to achieve a higher electric driving range, which could lead to negative electric vehicle driving range in real-world scenarios. Conclusion Negative electric vehicle driving range and fuel consumption on NEDC are one of the challenges facing manufacturers of hybrid-electric vehicles. The phenomenon occurs when the car’s battery does not charge fully during the test, causing the combustion engine to take over before it was expected. This, in turn, affects the fuel consumption and electric driving range of the vehicle, leading to overestimation of the vehicle's fuel efficiency and carbon dioxide emissions. Manufacturers have to balance the electric driving range and fuel consumption to ensure that their vehicles pass the NEDC test without compromising their real-world performance.摘要：Understanding the Concept of Negative Electric Vehicle Driving Range and Fuel Consumption on NEDC Introduction The NEDC or New European Driving Cycle is an impo
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