Test Technologies Contributing to Electrification - 5. Test Technology for Thermal Management System Achieving Both Low Electricity Cost and High ComfortFig. 6 Low-temperature solar radiation test room with all-weather environmental chassis dynamometerFig. 7 Rainfall and snowfall test room with all-weather environmental chassis dynamometerFig. 8 Rainfall and snowfall test room with all-weather environmental chassis dynamometer 4. Summarytemperature environment of the vehicle is determined by external factors, such as ambient air temperature, humidity, and solar radiation, as well as internal factors derived from driving self-heating sources, such as the powertrain and temperature environments affect one another. For example, the self-heating of a vehicle increases the outside air temperature; this change makes it impossible to conduct tests in a constant-temperature environment. Therefore, an test facility that is not affected by the self-heating of the vehicle is required. An additional facility is required to evaluate the noise from the operating HVAC and cooling components. the battery. These An all-weather environmental chassis dynamometer responds to four-wheeled vehicles. This system can reproduce not only cold-to-hot temperature environments, humidity, and solar radiation, but also rainfall and snowfall environments. These facilities have sufficient refrigeration capacity to absorb the effects of heat from the vehicles, such as ICE vehicles. Furthermore, the noise from the chassis dynamometer and wind tunnel equipment is reduced to enable noise evaluation (Fig. 8).The environmental test room is equipped with a rapid charger. With this charger, it is possible to measure the charging behavior immediately after driving in cold and hot environments, the accompanying effects on interior comfort, and even electricity costs.The EVs are spreading rapidly and expanding their markets. However, the thermal environment of EVs can significantly affect their performance, reliability, and battery life. Therefore, thermal management technology and its supporting test technologies were created to optimize the thermal environments using electrical energy without wasting it. The comfortable and reliable EVs produced are expected to contribute to improved product appeal and market expansion.chassis dynamometer environmental can accurately reproduce a temperature environment. EV-specific thermal management tests with complex transitions over driving modes are conducted at both low and high temperatures to investigate the performance limit.59
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