发明授权
US07861586B2 Hot-film air mass meter having frequency-modulated signal detection
有权
具有调频信号检测的热膜空气质量计
- 专利标题: Hot-film air mass meter having frequency-modulated signal detection
- 专利标题(中): 具有调频信号检测的热膜空气质量计
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申请号: US11990573申请日: 2006-06-13
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公开(公告)号: US07861586B2公开(公告)日: 2011-01-04
- 发明人: Bernard Opitz , Ulrich Wagner , Axel Franke , Carsten Raudzis
- 申请人: Bernard Opitz , Ulrich Wagner , Axel Franke , Carsten Raudzis
- 申请人地址: DE Stuttgart
- 专利权人: Robert Bosch GmbH
- 当前专利权人: Robert Bosch GmbH
- 当前专利权人地址: DE Stuttgart
- 代理机构: Kenyon & Kenyon LLP
- 优先权: DE102005038597 20050816
- 国际申请: PCT/EP2006/063120 WO 20060613
- 国际公布: WO2007/020115 WO 20070222
- 主分类号: G01F1/68
- IPC分类号: G01F1/68
摘要:
A method for measuring an air mass flow flowing in a main flow direction, and a hot-film air mass meter by which the method is able to be realized. The method and the hot-film air mass meter are especially suitable for use in the induction tract of an internal combustion engine. The hot-film air mass meter includes a sensor chip having a chip surface across which an air mass flow is able to flow. The chip surface in turn has a measuring surface, the measuring surface including a central hot-film air mass meter circuit having at least one central heating element and at least two temperature sensors. The method is implemented so that the at least one central heating element is periodically heated using a frequency ω. With the aid of at least two temperature sensors, at least two measuring signals are detected. The measuring signals and/or at least one differential signal of the at least two measuring signals are modulated using the frequency ω.