Air/fuel ratio controller for internal combustion engine
This invention relates to a device for detecting and correcting fluctuations in the output characteristics of an air/fuel ratio sensor for an internal combustion engine. A catalyst which has an oxygen storage function is provided in the exhaust gas pipe of an engine The oxygen storage amount is esti...
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| creator | Kobayashi, Hideaki Kakizaki, Shigeaki |
| description | This invention relates to a device for detecting and correcting fluctuations in the output characteristics of an air/fuel ratio sensor for an internal combustion engine.
A catalyst which has an oxygen storage function is provided in the exhaust gas pipe of an engine The oxygen storage amount is estimated based on the output of the air/fuel ratio sensor upstream of the catalyst The air/fuel ratio is controlled so that the oxygen storage amount coincides with the target value. When the output of the downstream air/fuel ratio sensor continuously displays a rich or a lean value for more than a determination time which is varied continuously with respect to operating conditions, deterioration in the upstream air/fuel ratio sensor is detected. Thus the output of the upstream air/fuel ratio sensor is corrected based on the output of the downstream air/fuel ratio sensor In this manner, output fluctuations are corrected based on the deterioration of the air/fuel ratio sensor upstream of the catalyst. |
| format | Patent |
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A catalyst which has an oxygen storage function is provided in the exhaust gas pipe of an engine The oxygen storage amount is estimated based on the output of the air/fuel ratio sensor upstream of the catalyst The air/fuel ratio is controlled so that the oxygen storage amount coincides with the target value. When the output of the downstream air/fuel ratio sensor continuously displays a rich or a lean value for more than a determination time which is varied continuously with respect to operating conditions, deterioration in the upstream air/fuel ratio sensor is detected. Thus the output of the upstream air/fuel ratio sensor is corrected based on the output of the downstream air/fuel ratio sensor In this manner, output fluctuations are corrected based on the deterioration of the air/fuel ratio sensor upstream of the catalyst.</description><language>eng</language><creationdate>2003</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6622477$$EPDF$$P50$$Guspatents$$Hfree_for_read</linktopdf><link.rule.ids>230,308,780,802,885,64038</link.rule.ids><linktorsrc>$$Uhttps://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6622477$$EView_record_in_USPTO$$FView_record_in_$$GUSPTO$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Kobayashi, Hideaki</creatorcontrib><creatorcontrib>Kakizaki, Shigeaki</creatorcontrib><creatorcontrib>Nissan Motor Co., Ltd</creatorcontrib><title>Air/fuel ratio controller for internal combustion engine</title><description>This invention relates to a device for detecting and correcting fluctuations in the output characteristics of an air/fuel ratio sensor for an internal combustion engine.
A catalyst which has an oxygen storage function is provided in the exhaust gas pipe of an engine The oxygen storage amount is estimated based on the output of the air/fuel ratio sensor upstream of the catalyst The air/fuel ratio is controlled so that the oxygen storage amount coincides with the target value. When the output of the downstream air/fuel ratio sensor continuously displays a rich or a lean value for more than a determination time which is varied continuously with respect to operating conditions, deterioration in the upstream air/fuel ratio sensor is detected. Thus the output of the upstream air/fuel ratio sensor is corrected based on the output of the downstream air/fuel ratio sensor In this manner, output fluctuations are corrected based on the deterioration of the air/fuel ratio sensor upstream of the catalyst.</description><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2003</creationdate><recordtype>patent</recordtype><sourceid>EFH</sourceid><recordid>eNrjZLBwzCzSTytNzVEoSizJzFdIzs8rKcrPyUktUkjLL1LIzCtJLcpLzAGK5yaVFgNV5Cmk5qVn5qXyMLCmJeYUp_JCaW4GBTfXEGcP3dLigsSS1LyS4vj0okQQZWBmZmRkYm5uTIQSAPVuL4g</recordid><startdate>20030923</startdate><enddate>20030923</enddate><creator>Kobayashi, Hideaki</creator><creator>Kakizaki, Shigeaki</creator><scope>EFH</scope></search><sort><creationdate>20030923</creationdate><title>Air/fuel ratio controller for internal combustion engine</title><author>Kobayashi, Hideaki ; Kakizaki, Shigeaki</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-uspatents_grants_066224773</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2003</creationdate><toplevel>online_resources</toplevel><creatorcontrib>Kobayashi, Hideaki</creatorcontrib><creatorcontrib>Kakizaki, Shigeaki</creatorcontrib><creatorcontrib>Nissan Motor Co., Ltd</creatorcontrib><collection>USPTO Issued Patents</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Kobayashi, Hideaki</au><au>Kakizaki, Shigeaki</au><aucorp>Nissan Motor Co., Ltd</aucorp><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Air/fuel ratio controller for internal combustion engine</title><date>2003-09-23</date><risdate>2003</risdate><abstract>This invention relates to a device for detecting and correcting fluctuations in the output characteristics of an air/fuel ratio sensor for an internal combustion engine.
A catalyst which has an oxygen storage function is provided in the exhaust gas pipe of an engine The oxygen storage amount is estimated based on the output of the air/fuel ratio sensor upstream of the catalyst The air/fuel ratio is controlled so that the oxygen storage amount coincides with the target value. When the output of the downstream air/fuel ratio sensor continuously displays a rich or a lean value for more than a determination time which is varied continuously with respect to operating conditions, deterioration in the upstream air/fuel ratio sensor is detected. Thus the output of the upstream air/fuel ratio sensor is corrected based on the output of the downstream air/fuel ratio sensor In this manner, output fluctuations are corrected based on the deterioration of the air/fuel ratio sensor upstream of the catalyst.</abstract><oa>free_for_read</oa></addata></record> |
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| title | Air/fuel ratio controller for internal combustion engine |
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