公开(公告)号：US06903822B2

公开(公告)日：2005-06-07

申请号：US10175228

申请日：2002-06-20

申请人： Akihiko Kakuho ,  Teruyuki Itoh ,  Yutaka Hashidume

发明人： Akihiko Kakuho ,  Teruyuki Itoh ,  Yutaka Hashidume

IPC分类号： F02D45/00 ,  G01M15/04 ,  G01N21/35 ,  G01N21/3504 ,  F01N3/00 ,  G01N21/61

CPC分类号： G01N21/3577

摘要： A measuring light of specific wavelength, which is selectively absorbed by fuel, is transmitted through a measuring passage in a combustion chamber of an engine, to be received by a light receiving element, and intensity of the measuring light of specific wavelength received by the light receiving element is detected. Intensity of the measuring light having transmitted through the measuring passage is calculated, correcting the intensity of the light of specific wavelength detected when transmitting the measuring light through the measuring passage, with the intensity of the light of specific wavelength detected when intercepting the measuring light from transmitting through the measuring passage, while switching between the transmission of the measuring light through the measuring passage and the interception of the measuring light, and transmittance of the measuring light is calculated, based on the intensity of the measuring light before transmitting through the measuring passage and the intensity of the measuring light having transmitted through the measuring passage, so that fuel density in air-fuel mixture in the measuring passage is calculated based on the transmittance. Hereby, the fuel density can be accurately measured by removing an influence by the thermal radiation in the interior of the combustion chamber.

摘要翻译： 被燃料选择性地吸收的特定波长的测量光通过发动机的燃烧室中的测量通道传输，被光接收元件接收，并且由光接收的特定波长的测量光的强度 检测到接收元件。 计算通过测量通道的测量光的强度，校正当通过测量通道传输测量光时检测到的特定波长的光的强度，其中当截取来自测量光的测量光时检测到特定波长的光的强度 通过测量通道传输，同时在通过测量通道的测量光的透射与测量光的截取之间切换，并且基于在通过测量通道传送之前的测量光的强度来计算测量光的透射率 以及透过测量通道的测量光的强度，从而基于透射率计算测量通道中的空气 - 燃料混合物中的燃料密度。 因此，可以通过消除燃烧室内部的热辐射的影响来精确地测量燃料密度。