상용차량용 리타더 제동 토크에 대한 성능 모델링

Unlike passenger vehicles, heavy-duty vehicles vary greatly in overall mass depending on the load. When braking while driving a heavy-duty vehicle at high speed using friction brakes, significantly large braking power is generated. If there is no energy release system with sufficient power capacity, the brake system will overheat and lose braking power or even cause a fire. Therefore, in order to secure the braking stability of heavy-duty vehicles, a stable auxiliary braking system that assists the friction brake system is essential. As an auxiliary braking system, a retarder is a device that obtains braking force by using fluid flow resistance, and offers the advantages of being compact and having excellent operating durability. Since the internal flow field of the retarder rotates at high speed in a state where air and fluid are mixed, it is very difficult to measure flow characteristics and predict performance using performance tests. To overcome this difficulty, this study proposes an equivalent performance model that can represent the retarder output performance by analyzing the retarder shape factor and applying the transient state analysis results of the internal flow field.