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    • 5. 发明授权
    • Thermal-type air flow measuring instrument with fluid-direction judging
capability
    • 具有流体方向判断能力的热式气流测量仪
    • US5696321A
    • 1997-12-09
    • US544648
    • 1995-10-18
    • Shinya IgarashiChihiro KobayashiYasunori MouriHitoshi IshikawaKaoru Uchiyama
    • Shinya IgarashiChihiro KobayashiYasunori MouriHitoshi IshikawaKaoru Uchiyama
    • G01F1/68F02D35/00G01F1/684G01F1/69G01F5/00G01M15/00
    • G01F5/00G01F1/684G01F1/6842
    • There is disclosed a thermal-type air flow measuring instrument which judges whether the direction of flow of a fluid, ranging from a static flow to a pulsating flow involving a reverse flow, is forward or reverse, and outputs a signal corresponding to the flow rate of the fluid, thereby measuring the flow rate with high precision. An auxiliary passage is provided in a fluid passage, and is constituted by first, second and third passageways. Two temperature sensing resistors are mounted respectively at an upstream side and a downstream side within the first passageway in close proximity to each other. Most of the fluid, flowed into the first passageway in a forward direction, flows through the second passageway. The third passageway serves to direct a reverse flow of the fluid toward the temperature sensing resistors. Results of measurement of the flow rate of intake air in an internal combustion engine indicate that a minus error due to a pulsating flow, experienced in the conventional construction, is eliminated almost completely, and that a plus error due to a reverse flow is reduced to about 1/10.
    • 公开了一种热式空气流量测量装置,其判断从静止流到涉及逆流的脉动流的流体的流动方向是向前还是反向,并输出与流量对应的信号 的流体,从而以高精度测量流量。 辅助通道设置在流体通道中,并且由第一,第二和第三通道构成。 两个温度感测电阻分别安装在彼此靠近的第一通道内的上游侧和下游侧。 大多数流体沿向前的方向流入第一通道,流过第二通道。 第三通道用于将流体的反向流动引向温度感测电阻器。 内燃机中的进气流量的测定结果表明,传统结构中经历的脉动流量产生的负误差几乎完全消除,由于反向流动引起的正误差减小到 约+ E,fra 1/10 + EE。