시내버스 변속 패턴에 따른 연비 특성 분석

다국어 초록 (Multilingual Abstract)

A shift pattern is a very important factor on a vehicle fuel economy. Especially for manual transmission vehicles, a fuel economy varies according to a driver's tendency. If an indicator put a driver on notice of gear shift on pertinent point of time, the fuel economy can be improved. This paper focuses on fuel economy improvement through change of gear shifting engine speed and presents a gear shift algorithm considering a traction force, an APS, a vehicle acceleration and a BSFC(Brake Specific Fuel Consumption).
The bigger portion of high gear stage is, the better the engine efficiency and lower total cycle there will be. So the fuel economy of the vehicle becomes better. The specification of test vehicle is 6000㏄ diesel engines and the test condition is two cases, shift on high engine speed and shift on low engine speed. In the case of real experiment on the road, when the shift the gears at the normal condition, it was showed a preponderance of 25% at the shift on low engine speed in the average of twice experiments but the result of only 9% at the shift on high engine speed. That is, the lower engine speed is, the better fuel economy is presented. There are similar result at the simulation. However, if the engine speed is low in a gear shift, the vehicle can not be sufficient traction force. So, vehicle speed will be low or the section that can not follow required vehicle speed is occurred. In order to improve these problems, presented a gear shift algorithms that is considering a traction force. Our team got a shift profile to algorithm and applied it to the simulation. As a result, 13.7% of vehicle fuel economy improvement can be achieved comparing to normal condition.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 시내버스 실도로 운행 실험
• 3. 차량 시뮬레이션
• 4. 결론
• References