Hybrid car can improve fuel efficiency using a power of motor that is generated during constant-speed or deceleration driving. The motor is located between engine and transmission. But, when voltage of main battery is low, fuel efficiency is low because the voltage can't run the motor. In this situation, this study observed fuel efficiency when using solar cell for assistance power. In order to verify a fuel consumption of hybrid car equipped solar cell for assistance power, the car was tested downtown driving. As hybrid car was equipped solar cell for assistance, fuel consumption was reduced 8.35 % at running air conditioner. And, at air conditioner doesn't work, fuel consumption was reduced 6.88 %. This point of view, CO2 is expected to reduce in similar proportion.

Abstract
 1. 서론
 2. 시스템 분석 및 실험 방법
  2.1 보조 전원 시스템
  2.2 시스템 구성
  2.3. 실험방법
 3. 실험결과 및 고찰
 4. 결론
 참고문헌

• 김규성(서일대학 자동차과) | G. S. Kim
• 박성천(서울과학기술대학교 자동차공학과 내연기관/연소 실험실) | S. C. Park