CN105143624B - 尿素水供给***的诊断装置 - Google Patents
尿素水供给***的诊断装置 Download PDFInfo
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- CN105143624B CN105143624B CN201480023396.XA CN201480023396A CN105143624B CN 105143624 B CN105143624 B CN 105143624B CN 201480023396 A CN201480023396 A CN 201480023396A CN 105143624 B CN105143624 B CN 105143624B
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- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000003054 catalyst Substances 0.000 claims abstract description 27
- 230000009467 reduction Effects 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 230000005856 abnormality Effects 0.000 claims abstract description 3
- 230000002159 abnormal effect Effects 0.000 claims description 15
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001868 water Inorganic materials 0.000 claims description 7
- 210000002700 urine Anatomy 0.000 claims description 4
- 238000002405 diagnostic procedure Methods 0.000 description 16
- 238000006722 reduction reaction Methods 0.000 description 14
- 230000003647 oxidation Effects 0.000 description 12
- 238000007254 oxidation reaction Methods 0.000 description 12
- 101150074884 CNX1 gene Proteins 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910021536 Zeolite Inorganic materials 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000010457 zeolite Substances 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 241000256844 Apis mellifera Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 238000005915 ammonolysis reaction Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
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- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
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- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
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- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
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- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
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- F01N2900/1621—Catalyst conversion efficiency
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Abstract
一种具有对尿素水的浓度进行检测的传感器的尿素水供给***的诊断装置,其具备:取得部,取得传感器的检测值;算出部,算出基于选择还原型催化器的NOx的净化率;和诊断部,对尿素水供给***的状态进行诊断。当满足由算出部算出的净化率大于等于标准净化率的第1条件和由取得部取得的检测值大于等于标准浓度的第2条件中的任一条件时,诊断部诊断为传感器异常。
Description
技术领域
本发明涉及一种对尿素水供给***的状态进行诊断的尿素水供给***的诊断装置,该尿素水供给***具有对尿素水的浓度进行检测的传感器。
背景技术
以往,已知有对排气中的氮氧化物(以下,称为NOx。)进行净化的排气净化装置。该排气净化装置具备:尿素水供给***,向排气供给尿素水;和选择还原型催化器,已被供给了尿素水的排气流入该选择还原型催化器。例如,在尿素水的水分过量地蒸发、或者不符合标准的液体被补充到箱体中的情况下,尿素水的品质发生异常。若尿素水的品质不同,则为了在排气净化装置中获得所希望的净化性能所需的尿素水的量就会发生变化。为此,在专利文献1中提出了以下技术,在该技术中,由传感器对箱体中的尿素水的浓度进行检测,并根据该检测值来判断尿素水是否合适,在尿素水的品质发生异常的情况下警告驾驶者。
现有技术文献
专利文献
专利文献1:日本特开2002-371831号公报
另一方面,在根据上述传感器的检测值判断尿素水是否合适时,需以该传感器正常工作而输出有效的检测值、即该传感器的检测值为有效作为前提条件。当传感器的检测值无效时,正常的尿素水被判断成异常,或者异常的尿素水被判断成正常。其结果,由于仅仅根据1个传感器的检测值来诊断包含尿素水及传感器等的尿素水供给***的状态,所以会导致在尿素水供给***的状态的诊断结果中包含错误的判断。
发明内容
本发明的目的在于提供一种尿素水供给***的诊断装置,该诊断装置能够提高尿素水供给***的状态的诊断结果的精度。
在本发明的一个方式中,提供一种具有对尿素水的浓度进行检测的传感器的尿素水供给***的诊断装置。该诊断装置具备:取得部,取得所述传感器的检测值;算出部,算出基于选择还原型催化器的NOx的净化率;和诊断部,对所述尿素水供给***的状态进行诊断。所述诊断部构成为,当满足由所述算出部算出的所述净化率大于等于标准净化率的第1条件和由所述取得部取得的所述检测值大于等于标准浓度的第2条件中的任一条件时,诊断为所述传感器异常。
附图说明
图1是概略地表示具备本发明的技术的一个实施方式中的尿素水供给***的诊断装置的排气净化装置的图。
图2是表示图1的诊断装置的诊断处理的流程图。
具体实施方式
以下,参照图1以及图2,对本发明的尿素水供给***的诊断装置的一个实施方式加以说明。
如图1所示,在柴油发动机10(以下,简称为“发动机10”。)的排气通道12上配设有净化排气的排气净化装置20。流入到排气净化装置20中的排气流入前级氧化催化器22。
前级氧化催化器22为DOC(Diesel Oxidation Catalyst:柴油氧化催化器),将排气中所含的碳化氢(HC)、一氧化碳(CO)、一氧化氮(NO)氧化而转换成水、二氧化碳、二氧化氮等。前级氧化催化器22例如由载体和在该载体上担载的白金、钯等金属、或金属氧化物等形成,该载体由氧化铝、二氧化硅、沸石(zeolite)等形成。
通过了前级氧化催化器22的排气流入DPF(Diesel Particulate Filter:柴油颗粒过滤器)24。DPF24由陶瓷或者金属多孔体构成,并捕集排气中的颗粒物质(PM:Particulate Matter)。在DPF24的再生处理中,为使流入DPF24的排气的温度升高,例如,对在比前级氧化催化器22更靠上游的排气通道12的部分,从未予图示的燃烧器供给燃烧气体、或者从未予图示的燃料喷射阀喷射燃料。
在DPF24的下游、且后述的选择还原型催化器36的上游配设有作为第1NOx传感器的上游NOx传感器28。上游NOx传感器28按预定的控制周期对通过了DPF24的排气的NOx浓度Cnx1进行检测,并将表示该检测值、即NOx浓度Cnx1的信号输出至ECU44。
在上游NOx传感器28的下游配设有向排气通道12供给尿素水的电子控制式的喷射器30。贮留在箱体32内的尿素水被压送泵34压送至喷射器30。压送泵34内设有未予图示的安全阀,并将箱体32内的尿素水按预定的压力向喷射器30压送。喷射器30的开闭由ECU44控制。被供给到排气中的尿素水通过排气的热量被水解成氨。
在箱体32上配设有尿素水品质传感器35(以下,简称为“传感器35”。)。传感器35根据尿素水中的超声波的传播速度及尿素水的温度来检测尿素水的浓度,并将表示该检测值、即尿素水浓度Cur的信号输出至ECU44。喷射器30、箱体32、压送泵34、传感器35、以及尿素水构成尿素水供给***。
在喷射器30的下游配设有选择还原型催化器36。选择还原型催化器36进行用氨来还原NOx的选择性催化还原法(Selective Catalytic Reduction)。选择还原型催化器36例如由载体和保持吸附在该载体上的吸附性高的沸石或氧化锆(zirconia)形成,该载体由蜂窝状的陶瓷形成。排气中的NOx在选择还原型催化器36的催化作用下,与氨发生反应,还原成氮和水。
在选择还原型催化器36上配设有催化器温度传感器38。催化器温度传感器38按预定的控制周期对选择还原型催化器36的温度、即催化器温度Ts进行检测,并将表示该检测值、即催化器温度Ts的信号输出至ECU44。
通过了选择还原型催化器36的排气流入后级氧化催化器40。后级氧化催化器40为ASC(Ammonia Slip Catalyst:氨分解催化器),对在选择还原型催化器36的还原反应中未被消耗的氨进行分解。后级氧化催化器40例如由载体和保持吸附在该载体上的白金及钯等金属、或金属氧化物等形成,该载体由氧化铝、二氧化硅、沸石等形成。
在后级氧化催化器40的下游配设有作为第2NOx传感器的下游NOx传感器42。下游NOx传感器42按预定的控制周期对通过了后级氧化催化器40的排气的NOx浓度Cnx2进行检测,并将表示该检测值、即NOx浓度Cnx2的信号输出至ECU44。
ECU44为具备CPU、RAM、ROM等的微型计算机。如上所述,表示催化器温度Ts、尿素水浓度Cur、NOx浓度Cnx1、及NOx浓度Cnx2的信号被输入至ECU44。除此之外,ECU44按预定的控制周期从空气流量计46输入表示吸入空气量Ga的信号。ECU44将吸入空气量Ga当作排气通道12中的排气的流量、即排气流量来使用。也就是说,ECU44起到取得部的功能,该取得部取得催化器温度Ts、尿素水浓度Cur、NOx浓度Cnx1、NOx浓度Cnx2、及吸入空气量Ga。
ECU44根据从上述各种传感器输入的信息和预先存储于ROM的控制程序及各种数据来执行各种计算以及处理。ECU44通过控制喷射器30的开闭来执行尿素水的供给处理。作为诊断部的ECU44执行对尿素水供给***的状态进行诊断的诊断处理,判断传感器35是否合适、及箱体32内的尿素水是否合适。在诊断处理中判断成传感器35为“异常”、或尿素水为“异常”的情况下,ECU44使警报装置50工作,并将传感器35以及尿素水中被判断成“异常”的一方通知给驾驶者。
在供给处理中,ECU44按照每个预定的控制周期算出尿素水的供给量。ECU44基于以贮留在箱体32内的尿素水的浓度为所需浓度(例如,32.5%wt)作为前提条件,来算出尿素水的供给量。详细地讲,ECU44根据吸入空气量Ga、NOx浓度Cnx1、及催化器温度Ts来算出净化排气中的NOx所需的尿素水的基本供给量。ECU44通过基于根据上游NOx传感器28的NOx浓度Cnx1和下游NOx传感器42的NOx浓度Cnx2所算出的NOx的净化率η(=Cnx1/Cnx2)对基本供给量进行补正,来算出尿素水的补正供给量。ECU44向喷射器30输出控制信号,以便向排气供给与算出的补正供给量相对应的量的尿素水。
参照图2,对ECU44所执行的诊断处理加以说明。该诊断处理被重复执行。
如图2所示,在最初的步骤S11,ECU44取得各种信息(NOx浓度Cnx1、NOx浓度Cnx2、尿素水浓度Cur)。接着,ECU44起到算出部的功能,根据在步骤S11取得的NOx浓度Cnx1和NOx浓度Cnx2来算出NOx的净化率η(步骤S12)。
在下一步骤S13,ECU44判断净化率η是否大于等于标准净化率ηst。标准净化率ηst为上述各种数据中预先规定的值、即判断为排气中的NOx已被净化的净化率。另外,将净化率η大于等于标准净化率ηst称为第1条件。
在净化率η大于等于标准净化率ηst、即满足了第1条件的情况下(步骤S13:是),ECU44判断在步骤S11取得的尿素水浓度Cur是否大于等于标准浓度Cst(步骤S14)。标准浓度Cst为上述各种数据中预先规定的值,是通过向排气供给与在供给处理中算出的供给量相对应的量的尿素水而至少能获得标准净化率ηst的尿素水的浓度。另外,将尿素水浓度Cur大于等于标准浓度Cst称为第2条件。
在尿素水浓度Cur大于等于标准浓度Cst、即满足了第2条件的情况下(步骤S14:是),ECU44将传感器35以及尿素水两者均判断为“正常”,获得称为“正常”的诊断结果(步骤S15),并结束这次诊断处理。相反地,在步骤S14中尿素水浓度Cur小于标准浓度Cst、即没有满足第2条件的情况下(步骤S14:否),ECU44将尿素水判断为“正常”、且将传感器35判断为“异常”,获得称为“传感器35异常”的诊断结果(步骤S17),并结束这次诊断处理。
另一方面,在步骤S13中净化率η小于标准净化率ηst、即没有满足第1条件的情况下(步骤S13:否),与步骤S14相同,ECU44判断在步骤S11取得的尿素水浓度Cur是否大于等于标准浓度Cst(步骤S16)。
在尿素水浓度Cur大于等于标准浓度Cst、即满足了第2条件的情况下(步骤S16:是),ECU44转移到步骤S17的处理。ECU44将尿素水判断为“正常”、且将传感器35判断为“异常”,获得称为“传感器35异常”的诊断结果,并结束这次诊断处理。相反地,在尿素水浓度Cur小于标准浓度Cst、即没有满足第2条件的情况下(步骤S16:否),ECU44将尿素水判断为“异常”、且将传感器35判断为“正常”,获得称为“尿素水异常”的诊断结果(步骤S18),并结束这次诊断处理。在诊断处理结束之后,ECU44根据诊断处理的诊断结果使警报装置50工作,并将传感器35以及尿素水中被判断为“异常”的一方通知给驾驶者。
接着,对上述的诊断处理的作用加以说明。
在净化率η大于等于标准净化率ηst的第1条件、和尿素水浓度Cur大于等于标准浓度Cst的第2条件中的其中一个条件满足时,ECU44将传感器35判断为“异常”。
在没有满足第1条件而满足第2条件的情况下,虽然尿素水浓度Cur大于等于标准浓度Cst,但净化率η小于标准净化率ηst。因此,传感器35的尿素水浓度Cur会显示出比实际浓度要高的数值。另一方面,在满足第1条件而没有满足第2条件的情况下,虽然尿素水的浓度小于标准浓度Cst,但净化率η大于等于标准净化率ηst。因此,传感器35的尿素水浓度Cur会显示出比实际浓度要低的数值。通过按以上的形式对第1条件以及第2条件进行设定,能够判断传感器35是否合适。
根据上述实施方式的尿素水供给***的诊断装置,可以获得以下所列举的优点。
(1)由于通过诊断处理来判断传感器35是否合适,所以与不判断传感器35是否合适而判断尿素水是否合适的情况相比较,可提高尿素水供给***的状态的诊断结果的精度。
(2)在第1条件以及第2条件两者均未满足的情况下,净化率η小于标准净化率ηst、且尿素水浓度Cur小于标准浓度Cst。在这种情况下,并非传感器35为异常,而是尿素水的品质为异常。也就是说,通过按以上的形式设定第1条件以及第2条件,不仅能将传感器35是否合适作为诊断结果来获得,还能将尿素水是否合适作为诊断结果来获得。
(3)根据上游NOx传感器的检测值、即NOx浓度Cnx1和下游NOx传感器的检测值、即NOx浓度Cnx2来算出NOx的净化率η。也就是说,净化率η基于与NOx直接相关的实际检测值来算出。因此,与使用基于例如发动机的运转状态所推算的值来算出净化率η的情况相比较,提高了对于净化率η的信赖性。其结果,还提高了对于诊断处理的诊断结果的信赖性。
另外,上述实施方式也可以适当变更为以下的形式并加以实施。
·净化率η也可以使用基于例如发动机10的运转状态所推算的值来算出。
·在诊断处理中,也可以不判断尿素水是否合适。也就是说,也可以只判断传感器35是否合适。此时,尿素水是否合适也可以作为与诊断处理不同的处理来执行。
·将传感器35判断为“异常”的条件只要包含满足第1条件以及第2条件中的任一条件即可。另外,也可以进一步包含与第1条件以及第2条件不同的条件,例如尿素水浓度Cur小于比标准浓度要高的上限浓度的条件等。
·在第1条件以及第2条件两者均满足的情况下、以及两者均未满足的情况下,判断部也可以不判断传感器35是否合适。
·在供给处理中,也可以使用尿素水浓度Cur来作为尿素水的供给量被算出时的尿素水的浓度。
·发动机并不仅限于柴油发动机,也可以为汽油发动机或者天然气发动机。
Claims (5)
1.一种尿素水供给***的诊断装置,该尿素水供给***具有对尿素水的浓度进行检测的传感器,
所述诊断装置的特征在于,具备:
取得部,取得所述传感器的检测值;
算出部,算出基于选择还原型催化器的NOx的净化率;和
诊断部,对所述尿素水供给***的状态进行诊断,
所述诊断部构成为,当只满足由所述算出部算出的所述净化率大于等于标准净化率的第1条件和由所述取得部取得的所述检测值大于等于标准浓度的第2条件中的任一条件时,诊断为所述传感器异常。
2.根据权利要求1所述的尿素水供给***的诊断装置,其特征在于,
所述诊断部进一步构成为,当所述第1条件和所述第2条件均满足时,诊断为所述传感器正常。
3.根据权利要求1所述的尿素水供给***的诊断装置,其特征在于,
所述诊断部进一步构成为,当所述第1条件和所述第2条件均未满足时,诊断为所述传感器正常。
4.根据权利要求1所述的尿素水供给***的诊断装置,其特征在于,
所述诊断部进一步构成为,当所述第1条件和所述第2条件均未满足时,诊断为所述尿素水异常。
5.根据权利要求1~4中任意一项所述的尿素水供给***的诊断装置,其特征在于,
所述取得部取得对位于所述选择还原型催化器上游的排气的NOx浓度进行检测的第1NOx传感器的检测值、和对位于所述选择还原型催化器下游的排气的NOx浓度进行检测的第2NOx传感器的检测值,
所述算出部根据所述第1NOx传感器的检测值和所述第2NOx传感器的检测值来算出所述净化率。
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Citations (2)
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US8505371B2 (en) * | 2011-11-30 | 2013-08-13 | Ford Global Technologies, Llc | Methods for an exhaust fluid sensor |
KR20140087369A (ko) * | 2012-12-28 | 2014-07-09 | 현대자동차주식회사 | 요소 레벨 센서의 고장 진단 방법 및 장치 |
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