自動二輪車のエンジンブレーキ性能と交通事故解析への応用

抄録

 The motorcycle has a high running stability. Therefore, the motorcycle can keep running without the rider before and after a traffic accident. For Traffic accident reconstruction which involves an unmanned motorcycle, we needed the deceleration value of the motorcycle during running without a rider. Running without a rider is in much the same state as running with the engine brake on. Therefore, we investigated performance of motorcycle engine brake to use for analysis of traffic accident.
 Engine displacement of the motorcycles with manual transmission (MT) we used was from 250 cc to 1200 cc. And that with automatic transmission (AT) was 50 cc and 250 cc. We examined coasting tests in various speeds and various gears.
 In the result, we found that the motorcycle with MT speed bear a direct proportionate relationship to deceleration of engine brake running. And then, we found that speed change per unit distance doesn't depend on the motorcycle speed in case of high speed running. However, speed change per unit distance decreased in the case of low speed running by the motorcycle with MT. Simultaneously, the motorcycle with AT increased the value of speed change.