发明授权
- 专利标题： Atmospheric pressure detection device of four-stroke engine and method of detecting atmospheric pressure
- 专利标题（中）： 四冲程发动机大气压检测装置及大气压力检测方法
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申请号： US10493722申请日： 2002-10-22
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公开(公告)号： US06983646B2公开(公告)日： 2006-01-10
- 发明人: Yuichiro Sawada , Michiyasu Takahashi
- 申请人： Yuichiro Sawada , Michiyasu Takahashi
- 申请人地址： JP Iwata
- 专利权人： Yamaha Hatsudoki Kabushiki Kaisha
- 当前专利权人： Yamaha Hatsudoki Kabushiki Kaisha
- 当前专利权人地址： JP Iwata
- 代理机构： Hogan & Hartson, LLP
- 优先权： JP2001-335477 20011031
- 国际申请： PCT/JP02/10946 WO 20021022
- 国际公布： WO03/038262 WO 20030508
- 主分类号： G01M15/00
- IPC分类号： G01M15/00
摘要：
The atmospheric pressure is detected accurately without using an atmospheric pressure sensor.The atmospheric pressure is obtained from an intake air pressure just before an inlet valve opens by detecting an intake air pressure. Since the intake air pressure just before the inlet valve opens becomes unstable when the engine load is large, the atmospheric pressure is calculated from an intake air pressure just before the inlet valve opens when the engine load is small. In addition, since the intake air pressure just before the inlet valve opens depending upon engine rotational speeds, the atmospheric pressure is calculated from an intake air pressure just before the inlet valve opens when the engine rotational speed resides in a predetermined rotational speed area.
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