MALFUNCTION DIAGNOSING DEVICE FOR AIR/FUEL RATIO SENSOR
PROBLEM TO BE SOLVED: To improve the accuracy of diagnosing the malfunction of an air/fuel ratio sensor by distinguishing the influence of time constant deterioration of the air-fuel ratio sensor from that of waste time deterioration when diagnosing the malfunction. SOLUTION: PI control (malfunction...
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| creator | YAMASHITA YUKIHIRO NAGASHIMA KO YOSHIUME NAOKI |
| description | PROBLEM TO BE SOLVED: To improve the accuracy of diagnosing the malfunction of an air/fuel ratio sensor by distinguishing the influence of time constant deterioration of the air-fuel ratio sensor from that of waste time deterioration when diagnosing the malfunction. SOLUTION: PI control (malfunction diagnosing air-fuel ratio control) is executed to periodically change an air-fuel ratio detected by the air-fuel ratio sensor 25. A time when the air-fuel ratio detected by the air-fuel ratio sensor 25 passes through a predetermined rich-direction section during PI control is detected as a rich-direction time constant, and a time when it passes through a predetermined lean-direction section is detected as a lean-direction time constant. A time from the air-fuel ratio being corrected to be much greater to the detected air-fuel ratio exceeding a rich-direction threshold value is detected as a rich-direction waste time, and a time from the air-fuel ratio being corrected to be much smaller to the detected air-fuel ratio exceeding a lean-direction threshold value is detected as a lean-direction waste time. The rich-direction time constant, the lean-direction time constant, the rich-direction waste time and the lean-direction waste time are each compared with a malfunction determined value to diagnose the presence or not of the malfunction. COPYRIGHT: (C)2006,JPO&NCIPI |
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SOLUTION: PI control (malfunction diagnosing air-fuel ratio control) is executed to periodically change an air-fuel ratio detected by the air-fuel ratio sensor 25. A time when the air-fuel ratio detected by the air-fuel ratio sensor 25 passes through a predetermined rich-direction section during PI control is detected as a rich-direction time constant, and a time when it passes through a predetermined lean-direction section is detected as a lean-direction time constant. A time from the air-fuel ratio being corrected to be much greater to the detected air-fuel ratio exceeding a rich-direction threshold value is detected as a rich-direction waste time, and a time from the air-fuel ratio being corrected to be much smaller to the detected air-fuel ratio exceeding a lean-direction threshold value is detected as a lean-direction waste time. The rich-direction time constant, the lean-direction time constant, the rich-direction waste time and the lean-direction waste time are each compared with a malfunction determined value to diagnose the presence or not of the malfunction. 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The rich-direction time constant, the lean-direction time constant, the rich-direction waste time and the lean-direction waste time are each compared with a malfunction determined value to diagnose the presence or not of the malfunction. 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SOLUTION: PI control (malfunction diagnosing air-fuel ratio control) is executed to periodically change an air-fuel ratio detected by the air-fuel ratio sensor 25. A time when the air-fuel ratio detected by the air-fuel ratio sensor 25 passes through a predetermined rich-direction section during PI control is detected as a rich-direction time constant, and a time when it passes through a predetermined lean-direction section is detected as a lean-direction time constant. A time from the air-fuel ratio being corrected to be much greater to the detected air-fuel ratio exceeding a rich-direction threshold value is detected as a rich-direction waste time, and a time from the air-fuel ratio being corrected to be much smaller to the detected air-fuel ratio exceeding a lean-direction threshold value is detected as a lean-direction waste time. The rich-direction time constant, the lean-direction time constant, the rich-direction waste time and the lean-direction waste time are each compared with a malfunction determined value to diagnose the presence or not of the malfunction. COPYRIGHT: (C)2006,JPO&NCIPI</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| subjects | BLASTING COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MEASURING MECHANICAL ENGINEERING PHYSICS TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR WEAPONS |
| title | MALFUNCTION DIAGNOSING DEVICE FOR AIR/FUEL RATIO SENSOR |
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