Study on the Test Procedure of Fuel Economy and CO2 Emissions for Vehicles with Adaptive Cruise Control System

Nowadays, a lot of vehicles install the autonomous technologies. However, we cannot evaluate the fuel economy and the emissions of these vehicles, which is working the autonomous technologies. The reason is that it is difficult to estimate it of these vehicles by using the chassis dynamometer. Therefore, we studied the new test procedure of the fuel economy and the emissions for these vehicles, which is working the Adaptive Cruise Control (ACC) function. To be specific, we use two vehicles and execute the real driving test. The leading vehicle operates by the driving robot. This vehicle drives the WLTC (Worldwide Harmonized Transient Cycle) and RDE (Real Driving Emission) mode with accuracy. And the following vehicle drives by operating the ACC function, which is the Level 2 of the autonomous technologies. In this report, firstly, we produced the driving robot for the RDE test. Next, by using this driving robot, we verified the fuel economy and the emissions of the test vehicle, which installed the ACC function. As a result, the driving behavior of the accelerator pedal and brake pedal for the following vehicle by using the ACC function was delayed compared to that of the leading vehicle by using the driving robot. The CO2 emission of the gasoline engine vehicle with the ACC function increased compared to this same vehicle, which doesn't work the ACC function.