RU2016122174A - Способ (варианты) и система для выполнения самодиагностической проверки датчика оксидов азота - Google Patents
Способ (варианты) и система для выполнения самодиагностической проверки датчика оксидов азота Download PDFInfo
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- RU2016122174A RU2016122174A RU2016122174A RU2016122174A RU2016122174A RU 2016122174 A RU2016122174 A RU 2016122174A RU 2016122174 A RU2016122174 A RU 2016122174A RU 2016122174 A RU2016122174 A RU 2016122174A RU 2016122174 A RU2016122174 A RU 2016122174A
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- sensor
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- 238000000034 method Methods 0.000 title claims 19
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims 6
- 238000002405 diagnostic procedure Methods 0.000 title 1
- 238000012360 testing method Methods 0.000 claims 18
- 239000007789 gas Substances 0.000 claims 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 8
- 239000001301 oxygen Substances 0.000 claims 8
- 229910052760 oxygen Inorganic materials 0.000 claims 8
- 230000006866 deterioration Effects 0.000 claims 3
- 230000015556 catabolic process Effects 0.000 claims 2
- 230000003197 catalytic effect Effects 0.000 claims 2
- 238000006731 degradation reaction Methods 0.000 claims 2
- 238000002485 combustion reaction Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 claims 1
- 238000012937 correction Methods 0.000 claims 1
- 239000000446 fuel Substances 0.000 claims 1
- 230000001771 impaired effect Effects 0.000 claims 1
- 238000007689 inspection Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000012795 verification Methods 0.000 claims 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
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- G01N33/0037—NOx
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- Combined Controls Of Internal Combustion Engines (AREA)
Claims (32)
1. Способ, содержащий шаги, на которых:
определяют, что произошло ухудшение характеристик датчика оксидов азота (OA), по показаниям, полученным от датчика во время самодиагностической (СД) проверки, выполняемой после первой завершенной СД-проверки после события выключения зажигания, только в том случае, если показания были сформированы в следующих условиях: температура на датчике ниже пороговой и концентрация кислорода в пределах порогового диапазона.
2. Способ по п. 1, отличающийся тем, что ухудшение характеристик датчика OA также определяют по показаниям, полученным от датчика, только в том случае, если показания были сформированы в условиях, при которых концентрация OA ниже пороговой.
3. Способ по п. 1, отличающийся тем, что событие выключения зажигания включает в себя прекращение цикла сжигания топлива в двигателе в ответ на управляющее воздействие, совершенное водителем транспортного средства через устройство ввода.
4. Способ по п. 1, отличающийся тем, что показания от датчика OA получают по шине сети локальных контроллеров (СЛК) от модуля управления датчика OA, причем модуль управления датчика OA выполнен с возможностью электрической связи с датчиком OA.
5. Способ по п. 1, отличающийся тем, что концентрацию OA и концентрацию кислорода оценивают по показаниям датчика OA во время СД-проверки.
6. Способ по п. 1, отличающийся тем, что температуру на указанном датчике определяют по показаниям датчика температуры, расположенного на одной оси с датчиком OA относительно потока отработавших газов, текущих мимо датчика OA.
7. Способ по п. 1, дополнительно содержащий шаг, на котором ухудшение характеристик датчика OA определяют на основании того, что полученные показания СД-проверки выходят за пределы порогового диапазона.
8. Способ по п. 6, отличающийся тем, что указанный пороговый диапазон определяют на основе положения датчика OA относительно избирательно-восстановительного каталитического (ИВК) нейтрализатора.
9. Способ по п. 1, отличающийся тем, что показания от датчика OA представляют собой результаты СД-проверки, соответствующие указанной СД-проверке, причем результаты СД-проверки представляют собой соотношение между одним или несколькими токами накачки, генерируемыми датчиком OA, и сохраненными значениями.
10. Способ по п. 1, отличающийся тем, что дополнительно оповещают водителя транспортного средства, если определено, что характеристики датчика OA ухудшены.
11. Способ по п. 1, отличающийся тем, что завершенная СД-проверка включает в себя эксплуатацию датчика OA и в первом режиме, и во втором режиме, при этом второй режим предшествует первому режиму, причем первый режим включает в себя регулирование концентрации кислорода в полости датчика OA до первого уровня и измерение концентрации OA в этой полости, причем второй режим включает в себя регулирование концентрации кислорода в указанной полости датчика OA до второго уровня и отсутствие измерения концентрации OA в этой полости.
12. Способ, содержащий шаги, на которых:
исключают результаты первой завершенной самодиагностической (СД) проверки датчика OA после события выключения зажигания двигателя;
исключают результаты завершенной СД-проверки, если выполнено одно или более из следующих условий: температура отработавших газов превышает пороговую и
концентрация кислорода в отработавших газах выходит за пределы порогового диапазона;
в иных случаях не исключают результаты завершенной СД-проверки; и
определяют, что произошло ухудшение характеристик датчика, только в том случае, если неисключенные результаты проверки отличаются от опорного значения более чем на пороговую величину.
13. Способ по п. 12, дополнительно содержащий шаг, на котором определяют, что СД-проверка завершена, по показаниям, полученным от модуля управления датчика OA по шине СЛК, причем модуль управления датчика OA выполнен с возможностью электрической связи с датчиком OA.
14. Способ по п. 10, отличающийся тем, что температура отработавших газов представляет собой температуру отработавших газов, текущих мимо датчика OA во время СД-проверки, причем указанную температуру оценивают по показаниям датчика температуры, расположенного рядом с датчиком OA.
15. Способ по п. 10, отличающийся тем, что концентрацию кислорода в отработавших газах оценивают по показаниям датчика OA во время СД-проверки.
16. Способ по п. 12, дополнительно содержащий шаг, на котором результаты проверки корректируют на поправочный коэффициент, в основе которого лежит среднее значение концентрации OA в отработавших газах, причем среднее значение концентрации OA рассчитывают по концентрации OA в отработавших газах, оцениваемой в течение некоего срока, причем указанный срок представляет собой часть СД-проверки.
17. Способ по п. 10, дополнительно содержащий шаг, на котором подают электропитание на датчик OA от модуля управления запальной свечой после события выключения зажигания двигателя.
18. Способ по п. 10, дополнительно содержащий шаг, на котором показания датчика OA получают через модуль управления датчика OA, причем указанные показания включают в себя одно или более из следующего: состояние СД-проверки, причем состояние СД-проверки указывает на то, была ли СД-проверка завершена или нет, результат СД-проверки, концентрацию кислорода и концентрацию OA.
19. Система, содержащая:
первый датчик OA, расположенный в выпускной системе двигателя выше по потоку от избирательно-восстановительного каталитического (ИВК) нейтрализатора;
второй датчик OA, расположенный ниже по потоку от ИВК-нейтрализатора;
первый датчик температуры, расположенный на одной оси с первым датчиком OA относительно потока отработавших газов в выпускной системе, для измерения температуры отработавших газов, текущих мимо первого датчика OA;
второй датчик температуры, расположенный на одной оси со вторым датчиком OA относительно потока отработавших газов в выпускной системе, для измерения температуры отработавших газов, текущих мимо второго датчика OA;
контроллер с возможностью электрической связи по шине СЛК с первым и вторым датчиками OA, причем контроллер содержит машиночитаемые команды для:
определения факта ухудшения характеристик первого датчика OA и (или) второго датчика OA по показаниям от первого датчика OA и первого датчика температуры и второго датчика OA и второго датчика температуры соответственно, причем указанные показания сформированы во время самодиагностической проверки после выключения зажигания транспортного средства.
20. Система по п. 19, отличающаяся тем, что результат проверки, состояние проверки, а также концентрации OA и (или) концентрации кислорода в отработавших газах, отобранных датчиками OA, оценивают по показаниям, полученным от первого и второго датчиков OA, и при этом температуру отработавших газов оценивают по показаниям, полученным от датчиков температуры.
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