CN100416054C - Engine controller and engine operating method - Google Patents
Engine controller and engine operating method Download PDFInfo
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- CN100416054C CN100416054C CNB2004800314215A CN200480031421A CN100416054C CN 100416054 C CN100416054 C CN 100416054C CN B2004800314215 A CNB2004800314215 A CN B2004800314215A CN 200480031421 A CN200480031421 A CN 200480031421A CN 100416054 C CN100416054 C CN 100416054C
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- Y02T10/24—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
[PROBLEMS] To prompt personnel to repair an SCR device if an abnormality occurs in the SCR device so as to appropriately manage the SCR device. [MEANS FOR SOLVING PROBLEMS] If an abnormality having occurred in an SCR device is detected, the output of an engine is limited. In an example, for this limitation, the map used to calculate the injected amount of fuel is changed from the one for the normal operation if an abnormality occurs (S407). Abnormalities to be detected include clogging of an injection nozzle and dilution of the urea water held in a tank.
Description
Technical field
The present invention relates to a kind of engine controlling unit and engine operating method, relate in particular to a kind of technology of using ammonia to purify the nitrogen oxide that discharges from motor car engine as reducing agent.
Background technique
As using secondary treatment (secondary treatment) to purify from motor institute air discharged pollutant, spy is that nitrogen oxide the exhaust (exhaust gas) (is designated hereinafter simply as NO in addition
X) equipment, known following SCR (Selective CatalyticReduction, selective catalytic reduction) equipment.This SCR equipment is installed in the exhaust passage of motor, and is provided with the nozzle of the aqueous solution that sprays ammonia or its precursor (precursor).From the ammonia of nozzle ejection (or the ammonia that obtains from this precursor) as reducing agent, its under the effect of catalyzer with exhaust in NO
XReact and purify this NO with reduction
XAs the SCR equipment of considering to store onboard easily ammonia, known a kind of SCR equipment as described below.This SCR equipment is provided with the storage tank (tank) of storage as the urea of the precursor of the ammonia that is in aqueous solution state, and in practical operation, the urea water injection that will provide from this storage tank is to the exhaust passage, so that use the hydrolysis next life ammonification (patent documentation 1) of exhaust gas heat from urea.
Patent documentation 1: TOHKEMY 2000-027627 communique
Summary of the invention
The problem to be solved in the present invention
Yet aforesaid this SCR equipment has following problem.As the setting relevant, the special situation that reduces the setting of discharge quantity of particulate matter that adopts is arranged with engine running.In this set, common NO
XDischarge amount can increase.If SCR equipment runs well, then can purify the NO that is discharged by using ammonia to carry out reduction reaction
XAt a certain amount of NO of this permission
XThe setting of discharging down supposes following situation: in SCR equipment, take place unusually, make the emitted dose of urea water be changed or urea water in ammonia content (that is urea concentration) be changed.In this case, because change has taken place in the ammonia adding quantity in the exhaust, so NO
XAnd the ratio between the ammonia departed from suitable value, so that reduction reaction can not carry out smoothly, and NO
XEliminating rate do not reach requirement.Especially under the situation that the ammonia adding quantity descends, NO
XJust be not discharged in the atmosphere through purifying.In addition, under the water except that urea water or the dissimilar aqueous solution are stored in situation in the storage tank, perhaps under storage tank is empty situation, cause and above-mentioned the same result.This when unusual when in SCR equipment, taking place, in order to limit NO
XDischarging need in time be repaired SCR equipment.Yet, not unusual can not the showing in the action of automobile of in SCR equipment, taking place, therefore, the driver notes less than this unusual.In addition, make measures such as emergency warning lamp or alarm buzzer work, also can think driver's place under repair in time even adopt.
The objective of the invention is to impel the driver in early days the stage just to the place under repair of SCR equipment, so that can access suitable maintenance to SCR equipment.
The method that addresses this problem
Therefore, according to the present invention, be provided with NO
XReducing agent adds in the motor of the interpolation equipment in the exhaust, and this unusual time of origin when detecting take place unusual in this interpolation equipment limits the output of this motor.Preferably, different with respect to the output characteristics of the output characteristics of the motor of driver's accelerator operation and normal time except that this unusual time of origin when unusual the generation, perhaps forbid after engine running stops, resetting this engine running.
Effect of the present invention
According to the present invention, when interpolation equipment take place unusual feasible can not be with the NO of accurate quantity
XWhen reducing agent adds in the exhaust of motor, the output of limiting engine for example, changes with respect to the output characteristics of the motor of driver's accelerator operation, and under identical accelerator operation amount, fuel injection amount is compared with the fuel injection amount of normal time and has been reduced.Therefore, can be at NO
XThe motion of restricting vehicle under the state that is not effectively purified can also impel the driver to repair this interpolation equipment.In addition, except the restriction that the change owing to output characteristics produces or replace this restriction, can constrained motion, and can impel adding the equipment place under repair by after engine running stops, forbidding resetting.
Below by the explanation of with reference to the accompanying drawings embodiment being carried out, other purposes of the present invention, feature and advantage are conspicuous.
Here comprise as a reference as the full content of TOHKEMY 2003-362411 number of the prior claims basis and 2004-026056 communique.
Description of drawings
Fig. 1 illustrates the overall structure according to the motor of first embodiment of the invention;
Fig. 2 illustrates the structure of urea sensor;
The urea sensor that Fig. 3 illustrates by Fig. 2 carries out the principle that concentration detects;
Fig. 4 illustrates the flow chart of abnormality detection program;
Fig. 5 illustrates the flow chart of concentration trace routine;
Fig. 6 illustrates the flow chart of urea water injection control program;
Fig. 7 illustrates the flow chart of fuel injection amount setting program;
Fig. 8 illustrates the flow chart of fuel cut-off program;
Fig. 9 illustrates the flow chart according to the fuel injection amount setting program of second embodiment of the invention;
Figure 10 illustrates the flow chart according to the starting control program of third embodiment of the invention;
Figure 11 illustrates the flow chart according to the fuel injection amount setting program of fourth embodiment of the invention;
Figure 12 illustrates the table that is used to be provided with according to the 4th embodiment's variance ratio;
Figure 13 illustrates the notion according to the 4th embodiment's export-restriction.
Description of reference numerals
1: motor; 11: gas-entered passageway; 12: turbosupercharger; 13: knock out drum; 21: sparger; 22: be total to rail; 31: the exhaust passage; 32: oxidation catalyst; 33:NO
XCleaning catalyst; 34: the ammonia cleaning catalyst; The 35:EGR pipe; The 36:EGR valve; 41: storage tank; 42: the urea water supply tube; 43: nozzle; 44: feed pump; 45: filter; 46: the urea water reflow pipe; 47: pressure controlled valve; 48: the air supply pipe; 51: motor C/U; 61:SCR-C/U; 71,72: exhaust gas temperature sensor; 73:NO
XSensor; 74: urea sensor; 75: air pressure probe; 76: the urea water pressure transducer; 77: the componentry voltage transducer.
Embodiment
The present invention will be described below with reference to the accompanying drawings.
Fig. 1 illustrates the overall structure of the motor car engine (being designated hereinafter simply as motor) according to first embodiment of the invention.In the present embodiment, as motor 1, adopt direct injection type diesel engine.
At the intake section of gas-entered passageway 11 the air-strainer (not shown) has been installed, and has removed by this air-strainer and to enter dust in air.In gas-entered passageway 11, be provided with the compressor 12a of variable nozzle-type turbocharger 12 so that by compressor 12a to entering air and compress and it being sent.The air that enters after compression flows in the knock out drum (surge tank) 13, and by manifold (manifold) part it is distributed to each cylinder.
In engine block, the cylinder head of each cylinder is provided with sparger 21.Sparger 21 carries out work according to the signal from control unit of engine (being designated hereinafter simply as motor C/U) 51.The fuel that to be sent by the petrolift (not shown) offer sparger 21 by rail (common rail) 22 altogether, and by sparger 21 it directly be sprayed in the firing chamber.
In exhaust passage 31, the turbine 12b of turbosupercharger 12 is set at the downstream of manifold part.Turbine 12b makes compressor 12a be rotated by exhaust gas drive.The angle of the removable blade 121 of turbine 12b is by actuator 122 controls.The rotational velocity of turbine 12b and compressor 12a changes according to the angle of removable blade 121.
In the downstream of turbine 12b, oxidation catalyst 32, NO are set in order from upstream side
XCleaning catalyst 33 and ammonia cleaning catalyst 34.Hydrocarbon and carbon monoxide in 32 pairs of exhausts of oxidation catalyst carry out oxidation, and with the nitrous oxide in the exhaust (below abbreviate NO as) be converted into consist predominantly of nitrogen dioxide (below abbreviate NO as
2) NO
XThereby, carry out NO and the NO that will be included in the exhaust
2Ratio be adjusted into NO
XThe operation of the ratio that reduction reaction (describing after a while) is optimum.NO
XCleaning catalyst 33 reduction purify NO
XIn the present embodiment, in order to promote NO
XThe reduction of cleaning catalyst 33 is at NO
XNO has been added in the upstream of cleaning catalyst 33 in exhaust
XThe ammonia of reducing agent effect.
In the present embodiment, consider and store ammonia easily onboard, with the urea of aqueous solution state storage as the precursor of ammonia.By ammonia is stored as urea, can guarantee safety.
Urea water supply tube 42 is connected to the storage tank 41 of storing urea water, and the nozzle 43 of urea water is installed on the front end of urea water supply tube 42.From upstream side feed pump 44 and filter 45 are arranged on the urea water supply tube 42 in order.Feed pump 44 is driven by motor 441.441 pairs of discharge amounts from feed pump 44 of motor are adjusted, wherein based on the rotational velocity of controlling motor 441 from the signal of SCR control unit (being designated hereinafter simply as SCR-C/U) 61.In addition, in the downstream of filter 45, urea water reflow pipe 46 is connected to urea water supply tube 42.In urea water reflow pipe 46, pressure controlled valve 47 has been installed, be back to storage tank 41 so that will exceed the residue urea water of the amount of specified pressure.
Nozzle 43 is air boosting type nozzles, and comprises main body 431 and nozzle segment 432.Urea water supply tube 42 is connected to main body 431, and the air supply pipe 48 that is provided for the air (being designated hereinafter simply as the boosting air) of boosting also is connected to main body 431.Air supply pipe 48 is connected to the gas tank (not shown), and provides this boosting air from this gas tank.Nozzle segment 432 is set at NO
XThe upstream of cleaning catalyst 33 is so that pass through NO from the side
XThe tank body of cleaning catalyst 33 and ammonia cleaning catalyst 34 (housing).The injection direction of nozzle segment 432 is configured to towards NO
XThe end face of cleaning catalyst 33, the direction parallel with the mobile phase of exhaust.
When spraying urea water, the urea in the urea water of being sprayed is owing to hydrolysis takes place in exhaust gas heat, thus generation ammonia.The ammonia that is generated is at NO
XPlay NO on the cleaning catalyst 33
XThe effect of reducing agent, thereby quicken NO
XReduction.Ammonia cleaning catalyst 34 is to be used for purifying through NO
XThe ammonia that slips over (slip-ammonia) of cleaning catalyst 33 and not to NO
XThe catalyzer that reduction is worked.Because ammonia has penetrating odor, therefore preferably preferably do not discharge ammonia without purifying.The oxidation reaction of NO on the oxidation catalyst 32, the hydrolysis reaction of urea, NO
XNO on the cleaning catalyst 33
XReduction reaction and the oxidation reaction of the ammonia that slips on the ammonia cleaning catalyst 34 represent by following formula (1) to (4) respectively.In the present embodiment, NO
XCleaning catalyst 33 and ammonia cleaning catalyst 34 are contained in the single tank body by collection.Yet, each catalyzer 33 and 34 fens openers can be contained in the independent tank body.
NO+1/2O
2→NO
2 (1)
(NH
2)
2CO+H
2O→2NH
3+CO
2 (2)
NO+NO
2+2NH
3→2N
2+3H
2O (3)
4NH
3+3O
2→2N
2+6H
2O (4)
In addition, exhaust passage 31 is connected to gas-entered passageway 11 via EGR pipe 35.Exhaust is recycled to gas-entered passageway 11 via EGR pipe 35.In EGR pipe 35, EGR valve 36 is installed, and the flow velocity of the exhaust of recirculation is controlled by EGR valve 36.The opening of EGR valve 36 is controlled by actuator 361.
In exhaust passage 31, be used to detect the temperature transducer 71 that adds urea water delivery temperature before and be set at oxidation catalyst 32 and NO
XBetween the cleaning catalyst 33.In the downstream of ammonia cleaning catalyst 34, the NO that is included in exhaust after being provided with the temperature transducer 72 that is used for detecting the delivery temperature after the reduction and being used to detect reduction
XThe NO of concentration
XSensor 73.In addition, in storage tank 41, be provided with the urea sensor 74 of concentration (following when only using " concentration " speech, this speech means " the urea concentration ") Dn that is used for detecting the urea that is included in the urea water of being stored.In the present embodiment, urea sensor 74 also has the function of judging the amount of staying the urea water in the storage tank 41.
From temperature transducer 71 and 72, NO
XThe testing signal of sensor 73 and urea sensor 74 is output to SCR-C/U 61.SCR-C/U 61 calculates and is provided with optimum urea water injection amount based on the signal of being imported, outputing to nozzle 43 according to the command signal of set urea water injection amount.In addition, SCR-C/U 61 is connected to motor C/U 51, so that can carry out both-way communication.Except the testing signal from the sensor 71～74, SCR-C/U 61 also receives boosting air pressure Pa, urea water pressure P u and urea sensor voltage Vs.Boosting air pressure Pa is the pressure in the air supply pipe 48, and by the pressure transducer 75 that is arranged in the air supply pipe 48 it is detected.Urea water pressure P u is the pressure in the urea water supply tube 42, and by the pressure transducer in the urea water supply tube 42 that is arranged on feed pump 44 downstreams 76 it is detected.Urea sensor voltage Vs is according to the voltage of being exported by urea sensor 74 detected concentration, and by voltage transducer 77 to its detection.SCR-C/U 61 detects unusual in the urea water injection system that occurs in as hereinafter described based on the judged result of the residual capacity of boosting air pressure Pa, urea water pressure P u, urea sensor voltage Vs and concentration Dn and urea water, and will represent that the signal of unusual generation outputs to motor C/U 51.
In motor 1, ignition switch, switch starter, crank angle sensor, vehicle speed sensor, accelerator sensor etc. have been installed, and its testing signal has been input to motor C/U 51.Motor C/U 51 comes calculation engine rotational velocity Ne based on the signal from the crank angle sensor input.Motor C/U 51 is based on coming computing fuel emitted dose Qf as operating conditions such as engine rotational speed Ne, and will output to SCR-C/U 61 as the required information of injection control of the urea water such as Qf that calculate.
In the present embodiment, motor C/U 51 is corresponding to first control unit, and SCR-C/U 61 is corresponding to second control unit.
Fig. 2 illustrates the structure of urea sensor 74.
The structure of urea sensor 74 is identical with the structure of disclosed flowmeter (flow meter) in TOHKEMY 2001-228004 communique, and detects urea concentration based on the electric properties value of two temperature-sensing elements.
Second sensor element that disclosed flowmeter is provided with the first sensor element with heater function and does not have the heater function in above-mentioned communique.The former first sensor element comprises heater layer and is being in the resistance temperature sensing layer (abbreviating the first resistance temperature sensing layer as) as temperature-sensing element that forms on this heater layer of state of insulation.The latter's second sensor element comprises the resistance temperature sensing layer (abbreviating the second resistance temperature sensing layer as) as temperature-sensing element, but does not comprise heater layer.Each sensor element is integrated in the resin tank body, and is connected to the end as the fin-shaped plate of thermal conductor.
In the urea sensor 74 according to present embodiment, sensor element part 741 is configured to comprise first and second sensor elements.When detectable concentration, sensor element part 741 is immersed in the urea water of use, and it is arranged near the bottom of storage tank 41.In addition, each fin- shaped plate 7414 and 7415 is through tank body 7413, to be exposed to the inside of storage tank 41.
Fig. 3 illustrates the principle that concentration detects and residual capacity is judged.
By the heater-driven current i h of predetermined amount of time Δ t01 is provided to heater layer, carry out the heating of heater layer.Stopping when heater layer provides electric current, circuit part 742 detects the resistance value Rn1 and the Rn2 of each resistance temperature sensing layer, and the temperature difference Δ Tmp12 between the calculated resistance temperature sensing layer (=Tn1-Tn2).It is the heat-transfer character of media that temperature difference between the resistance temperature sensing layer depends on the urea water, and this heat-transfer character depends on urea concentration.Therefore, can convert the temperature difference Δ Tmp12 that calculates to concentration Dn.In addition, can judge whether storage tank 41 is empty based on the temperature difference Δ Tmp12 that is calculated.
In the present embodiment, sensor element part 741 is configured to make that in first sensor element 7,411 the first resistance temperature sensing layer contacts with urea water by fin-shaped plate 7414.Yet, sensor element part 741 can be configured to have measuring chamber, this measuring chamber is used for importing the urea water of the storage tank 41 in the sensor element part 741, so that heat the first resistance temperature sensing layer by the urea water in this measuring chamber by heater.In this case, the first resistance temperature sensing layer directly contacts mutually with urea water.
Next, reference flow sheet illustrates the running of motor C/U 51 and SCR-C/U 61.
The running of SCR-C/U 61 at first, is described.
Fig. 4 illustrates the flow chart of abnormality detection program.When connecting ignition switch, start this program, afterwards, repeat this program in each scheduled time.According to this program, detect in the urea water injection system, take place unusual.
At S101, read in boosting air pressure Pa, urea water pressure P u and urea sensor voltage Vs.
At S102, judge boosting air pressure Pa whether with predetermined value Pa2 be the upper limit and with predetermined value Pa1 (＜Pa2) be in the prespecified range of lower limit.When boosting air pressure Pa was in this scope, program entered S103, and when boosting air pressure Pa was not in this scope, program entered S108.When the boosting air pressure that detects less than value Pa1, can judge the boosting leakage of air has taken place in air supply pipe 42.When the boosting air pressure that detects greater than value Pa2, can judge in nozzle 43 obstruction has taken place.Under the situation that urea that passage condenses in by nozzle segment 432 etc. stops up, nozzle 43 stops up.
At S103, judge whether urea water pressure P u is equal to or greater than predetermined value Pu1.When the urea water pressure P u value of being equal to or greater than Pu1, program enters S104, and when urea water pressure P u less than value during Pu1, program enters S108.When the urea hydraulic pressure that detects less than value Pu1, can judge feed pump 44 and break down, thereby can not provide enough pressure to urea water.
At S104, judge whether urea sensor voltage Vs is equal to or less than predetermined value Vs1.When the urea sensor voltage Vs value of being equal to or less than Vs1, program enters S105, and when urea sensor voltage Vs greater than value during Vs1, program enters S108.When the urea sensor voltage that detects greater than value Vs1, can judge in sensor element part 741 disconnection has taken place.
At S105, read in residual capacity judgement symbol Femp, and judge whether the sign Femp that is read is 0.When sign Femp was 0, program entered S106, and when sign Femp was not 0, program entered S108.Residual capacity judgement symbol Femp is set to 0 usually, and when the storage tank 41 judged as described below when empty, it is switched to 1.
At S106, read in dilution judgement symbol Fdil, and judge whether the sign Fdil that is read is 0.When sign Fdil was 0, program entered S107, and when sign Fdil was not 0, program entered S108.Dilution judgement symbol Fdil is set to 0 usually, and when judging urea water in the storage tank 41 by excess dilution, it is switched to 1 when as described below.
At S107, judge in the urea water injection system take place to be supposed unusual, and unusual judgement symbol Fscr is set to 0.Here, as the boosting leakage of air that is detected in the above described manner, the obstruction of nozzle 43, the fault of feed pump 44, the disconnection of sensor element part 741, the shortage of urea water residual capacity and the dilution of urea water, all be relevant with present embodiment detected unusual.
At S108, judge and in the urea water injection system, taken place any unusually, and unusual judgement symbol Fscr is set to 1, and makes emergency warning lamp work, thereby notifies the driver that unusual generation is arranged.
Fig. 5 illustrates the flow chart of concentration trace routine.When connecting ignition switch, start this program, afterwards, repeat this program in each scheduled time.According to this program, detectable concentration Dn, and the residual capacity of judgement urea water.
At S201, read in switch starter signal SWstr, and judge whether the signal SWstr that is read indicates 1.When signal SWstr indicates 1, judge and connected switch starter, and program enters S204, at S204, as described belowly come calculating concentration Dn.
At S202, assay intervals counter INT adds 1 (INT=INT+1).
At S203, judge whether the value that increases progressively counting counter INT afterwards reaches predetermined value INT1.When the value of counter INT reaches value INT 1, judge and guaranteed the required assay intervals of detectable concentration Dn, and program enters S204, and when the value of counter INT does not reach value INT1, judge and do not guarantee this assay intervals, and return information.
At S204, assay intervals counter INT is set to 0.
At S205, for the energising of the heater layer of urea sensor 74, with the direct heating first resistance temperature sensing layer, and with urea water as the media indirect heating second resistance temperature sensing layer.
At S206, calculating concentration Dn.By converting the calculating that concentration Dn carries out concentration Dn to according to the resistance value Rn1 of each resistance temperature sensing layer and the temperature difference Δ Tmp12 between the poor calculated resistance temperature sensing layer between the Rn2 and with the temperature difference Δ Tmp12 that calculates.
At S207, judge whether the temperature difference Δ Tmp12 that calculates is equal to or greater than predetermined value SL1.When the temperature difference Δ Tmp12 value of being equal to or greater than SL1, program enters S208, and when temperature difference Δ Tmp12 less than value during SL1, program enters S210.Value SL1 is set to the temperature difference Δ Tmp12 that obtains and is in intermediate value between the temperature difference Δ Tmp12 that obtains under the airborne state at urea sensor 74 under urea sensor 74 is in state in the urea water.
At S208, judge whether concentration Dn is equal to or greater than predetermined value D1.When the concentration Dn value of being equal to or greater than D1, program enters S209, and when concentration Dn less than value during D1, program enters S211.As be in water state in urea water or approach under the situation of diluted state of water state or will dewater or urea water beyond the dissimilar aqueous solution be stored in the concentration that can be detected under the situation in the storage tank 41, value D1 be set to 0 or intimate be 0 little value.
At S209, concentration Dn is used as concentration storing value D and stores.
At S210, it is empty judging storage tank 41, and residual capacity judgement symbol Femp is set to 1.
At S211, it is too rare and can not reach desired NO to judge the urea water that is stored in the storage tank 41
XPurification efficiency, and dilute judgement symbol Fdil and be set to 1.
Fig. 6 illustrates the flow chart of urea water injection control program.When connecting ignition switch, start this program, afterwards, repeat this program in each scheduled time.According to this program, urea water injection amount Qu is set.
At S301, read in unusual judgement symbol Fscr, and judge whether the sign Fscr that is read is 0.When sign Fscr was 0, program entered S302, and when sign Fscr is not 0, judged and taken place in the urea water injection system unusually, and program enters S305.
At S302, read in fuel injection amount Qf, NO
XConcentration NOX is (or from NO
XThe output of sensor 73) and concentration storing value D.
At S303, calculate urea water injection amount Qu.By based on fuel emitted dose Qf and N0
XConcentration NOX calculates basic emitted dose and utilizes concentration storing value D to proofread and correct the basic emitted dose that is calculated, and carries out the calculating of urea water injection amount Qu.When concentration storing value D was higher than the urea content in big and the per unit emitted dose, basic emitted dose reduced after overcorrect.On the other hand, when the urea content as concentration storing value D in the less and per unit emitted dose was low, basic emitted dose increased after overcorrect.
At S304, be output to nozzle 43 according to the CRANK PULSES of the urea water injection amount Qu that is calculated.
At S305, because take place in the urea water injection system under the unusual state can not be with respect to N0
XThe amount accurately of discharge amount is sprayed urea water, so the injection of urea water is stopped.When urea water injection amount during less than suitable value, might NO
XJust be not discharged in the atmosphere through purifying.On the contrary,, might not only unnecessarily consume urea water, and the ammonia of excessive generation is not decomposed fully by ammonia cleaning catalyst 34 and is discharged in the atmosphere when urea water injection amount during greater than this suitable value.In addition, not only when storage tank 41 when being empty, and when urea water during by excess dilution or when not being urea water but water etc. when being stored in the storage tank 41, can not interpolation NO
XPurify the ammonia of required amount.
Next, the running of motor C/U 51 is described.
Fig. 7 illustrates the flow chart of fuel injection amount setting program.When connecting ignition switch, start this program, afterwards, repeat this program in each scheduled time.According to this program, fuel injection amount Qf is set.
At S401, read in operating condition as motors 1 such as the accelerator operation amount in engine rotational speed Ne and accelerator opening or the present embodiment, APO.
At S402, read in unusual judgement symbol Fscr, and judge whether the sign Fscr that is read is 0.When sign Fscr was 0, program entered S403, and when sign Fscr is not 0, judged and taken place in the urea water injection system unusually, and program enters S404.
At S403, select the mapping table (map) of normal operation, and retrieve selected mapping table, thereby fuel injection amount Qf is set based on operating condition Ne that is read and APO.
At S404, disconnect starter and this starter as the connection between the power subsystems such as alternator, battery so that starter next starting time after the running of motor 1 stops not work, to forbid resetting of engine running.
At S405, read in car speed VSP.Can directly detect car speed VSP by the rotational velocity of detected transmission output shaft.Yet, also can detect car speed VSP indirectly by gear ratio (gear ratio) conversion engine rotational velocity Ne with transmission.
At S406, judge whether the car speed VSP that is read is equal to or greater than predetermined value VSP1.When the car speed VSP value of being equal to or greater than VSP1, program enters S407, and when car speed VSP less than value during VSP1, program enters S403.
At S407, select to be used for the mapping table of export-restriction running, and retrieve selected mapping table, thereby fuel injection amount Qf is set based on operating condition Ne that is read and APO.Under identical Ne and APO, use the set fuel injection amount Qf of this mapping table less than using the set fuel injection amount Qf of mapping table that runs well, therefore, limited the output (that is output torque) of motor 1.In the present embodiment, make the moment of torsion that when export-restriction is turned round, generates be the required minimal torque of speed steady motion on level road, make that restriction is to surpass the speed motion of predetermined value VSP1 in the time period till eliminating taken place unusual with predetermined value VSP1.When in the urea water injection system, taking place when unusual, owing to stop the injection (S305) of urea water as mentioned above, thereby avoided the instability of urea water to spray, therefore the comprehensive engine control of the setting by comprising fuel injection amount Qf suppresses NO as much as possible
XGeneration itself.
At S408, read in fuel cut-off sign Fcut, and judge whether the sign Fcut that is read is 0.When sign Fcut was 0, program entered S409, and when sign Fcut was not 0, program entered S410.Fuel cut-off sign Fcut is set to 0 usually, and is as described below, and when judging will stop supply of fuel the time, sign Fcut is switched to 1.
At S409, the fuel injection amount Qf of She Zhiing is set to export emitted dose Qfset in the above described manner, and will output to sparger 21 according to the CRANK PULSES of output emitted dose Qfset.
In S410, fuel injection amount Qf is set to 0, sprays thereby stop fuel.
Fig. 8 illustrates the flow chart of fuel cut-off program.When connecting ignition switch, start this program, afterwards, repeat this program in each scheduled time.According to this program, fuel cut-off sign Fcut is set.
At S501, read in accelerator opening APO.
At S502, judge whether the accelerator opening APO that is read is equal to or less than predetermined value APO1.When the accelerator opening APO value of being equal to or less than APO1, program enters S503, and when accelerator opening APO greater than value during APO1, program enters S504.
At S503, fuel cut-off sign Fcut is set to 1, sprays to stop fuel.
At S504, read in unusual judgement symbol Fscr, and judge whether the Fscr that is read is 0.When sign Fscr was 0, program entered S505, and when sign Fscr was not 0, program entered S507.
At S505, counter cnt adds 1 (CNT=CNT+1).This counter cnt is corresponding to passing the time of beginning of time when unusual of taking place from the urea water injection system.
At S506, whether the counter cnt that judgement increases progressively behind the counting reaches predetermined value CNT1.When counter cnt reached predetermined value CNT1, program entered S503, and when counter cnt did not reach value CNT1, program entered S508.
At S507, counter cnt is set to 0.
At S508, fuel cut-off sign Fcut is set to 0, sprays thereby carry out fuel.
In the present embodiment, storage tank 41, urea water supply tube 42, nozzle 43, feed pump 44 and air supply pipe 48 have constituted the interpolation equipment of reducing agent.Urea sensor 74 has two functions: as the first sensor that is used to detect urea concentration with as second sensor of the residual capacity that is used to judge urea water.In addition, outside the function of SCR-C/U 61, the function of whole flow chart shown in Figure 4 is corresponding to the abnormality detection parts in the present embodiment, and the function of the S504～S507 in whole flow chart shown in Figure 7 and the flow chart shown in Figure 8 is corresponding to the controlling component in the present embodiment.
According to present embodiment, can realize following effect.
At first, when generation is unusual in the urea water injection system, switch the mapping table that is used to be provided with fuel injection amount, make under identical accelerator opening APO, fuel injection amount Qf descends to some extent than the fuel injection amount in normal time, and the output of limiting engine 1.Therefore, when unusual the generation, motion that can restricting vehicle, and impel the driver to repair the urea water injection system, thus can realize suitable maintenance to the urea water injection system.
The second, have only when car speed VSP surpasses predetermined value VSP1, the just output of limiting engine 1, thus can guarantee minimal function as automobile.Therefore, can in traffic disturbance that the excessive restriction of avoiding owing to motor output causes etc., impel this repairing effectively.
The 3rd, when in the urea water injection system, taking place to forbid resetting engine running when unusual, in addition, in the past after the scheduled time, stop fuel and spray, thus the shutting engine down running.Therefore, can impel the driver in time to go the service station place under repair.In the present embodiment, owing to when detecting unusual generation, make emergency warning lamp work, so the driver can in time discover unusual generation so that go to the service station.By the way, in the present embodiment, when after detecting unusual generation, having pass by the scheduled time, stop supply of fuel (S410) immediately.Yet this structure also can be that fuel injection amount Qf is reduced gradually, thereby supply of fuel is stopped gradually.
The 4th, unusual as what in the urea water injection system, take place, detect the shortage of residual capacity of urea water or the dilution of urea water, thereby can promote the suitable management of urea water.Especially, detect the latter's dilution, therefore, can prevent the inappropriate use or wrong use of excess dilution urea water, the dissimilar aqueous solution except urea water etc.
Other embodiments of the present invention are described below.
Fig. 9 illustrates the flow chart according to second embodiment's fuel injection amount setting program.When connecting ignition switch, also start this program, afterwards, repeat this program in each scheduled time.Wherein handling each step identical with the processing in the flow chart shown in Figure 7 represents with identical reference character.
In this program,,, fuel injection amount Qf is set based on the operating condition that is read at S601 reading in afterwards as various operating conditions (S401) such as accelerator opening APO.When judging unusual judgement symbol Fscr is 1 and when correspondingly unusual (S402) taking place in the urea water injection system, disconnects the connection (S404) between starter and the power subsystem.Reading in car speed VSP (S405) afterwards, judge the car speed VSP that is read and be equal to, or greater than predetermined value VSP1, program enters S602, at S602, the Qf that sets in advance multiply by coefficient x1, and (=Qf * x1) replaces fuel injection amount Qf with resulting value.This coefficient x1 be used for limiting engine 1 output coefficient and be set to larger than 0 and less than 1 value.When judging fuel cut-off sign Fcut and be not 0 (S408), fuel injection amount Qf is set to 0 (S410), sprays thereby stop fuel.The fuel injection amount Qf of She Zhiing is set to export emitted dose Qfset (S409) in the above described manner, thereby makes sparger 21 work.
In the present embodiment, (function of and the S504 in the flow chart shown in Figure 8～S507) is corresponding to controlling component for whole flow chart shown in Figure 9.
According to present embodiment, except above-mentioned first to fourth effect, mapping table is not set owing to do not need to prepare to be used for separately the fuel injection amount of normal time and unusual time of origin, therefore can reduce the storage capacity of motor C/U 51.
Figure 10 illustrates the flow chart according to the 3rd embodiment's starting control program.When switching starting, start this program.With respect to first embodiment, present embodiment provides the modification that is used for forbidding resetting the control of engine running when unusual the generation.Provide the program that the fuel injection amount setting program is handled as the S404 in the program (Fig. 7) of wherein having omitted first embodiment.
At S701, read in switch starter signal SWstr, and judge whether the signal SWstr that is read is 1.When signal SWstr was 1, program entered S702, at S702, carried out starting control as described below.
At S702, read in unusual judgement symbol Fscr, and judge whether the sign Fscr that is read is 0.As sign Fscr when being 0, program enters S703, and when sign Fscr is not 0, judges to have taken place in the urea water injection system unusually and program enters S704.
At S703, be provided for starting the normal fuel injection amount Qfstr (below abbreviate the starting time emitted dose as) of control.Be set to value according to starting time emitted dose Qfstr such as coolant water temperature Tw greater than the fuel injection amount suitable with stoichiometric air-fuel ratio.
At S704, in order to forbid the running of piloting engine, the starting time, emitted dose Qfstr was set to 0.
At S705, judge that whether burning is finished, and when the starting of judging engine running is finished, stops this program, to transfer to the fuel injection amount setting program.Here, carry out burning based on engine rotational speed Ne and finish judgement, when the variance ratio of time per unit engine rotational speed Ne reaches predetermined value, judge and started engine running.
In the present embodiment, (function of and the S504 in whole flow chart shown in Figure 7 (not comprising S404) and the flow chart shown in Figure 8～S507) is corresponding to controlling component for S702 in the flow chart shown in Figure 10 and S704.
According to present embodiment, when unusual the generation, forbid resetting of engine running by supply of fuel is stopped, and can carry out the self-starting of starter.Therefore, in the urgent moment, for example when engine running when junction railway etc. stops, can carrying out withdrawing from this place.
Figure 11 illustrates the flow chart according to the 4th embodiment's fuel injection amount setting program.When connecting ignition switch, start this program, afterwards, repeat this program in each scheduled time.
In this program, read in as various operating conditions (S401) such as accelerator opening APO and car speed VSP, and, fuel injection amount (corresponding to second fuel duty) Qf (S601) is set based on the operating condition that is read.When judging unusual judgement symbol Fscr is 1 and when correspondingly unusual (S402) taking place in the urea water injection system, disconnect the connection (S404) between starter and the power subsystem, in addition, at S801, limit injection amount (corresponding to first fuel duty) Qflmt is set.The emitted dose of the output of the motor 1 when limit injection amount Qflmt is set to be used to limit unusual the generation, and in the present embodiment,, calculate limit injection amount Qflmt according to following formula based on actual vehicle speed VSP.In following formula, Qfvsp is set to be used for when detecting unusual generation with the required fuel injection amount of car speed VSP steady motion on level road, and calculates Qfvsp by the table that retrieval is stored in each car speed among the motor C/U 51 in advance.In addition, Qfdlt is that (=VSP-VSP1) correcting value, and suppose that the variance ratio of each execution cycle of this program is DQ, DQ calculates Qfdlt by the accumulative total variance ratio according to the difference DLT of car speed VSP and predetermined value VSP1.Speed difference DLT is big more, and variance ratio DQ is calculated as big more value (Figure 12), and as car speed VSP during less than predetermined value VSP1, DQ is calculated as negative value.
Qflmt＝Qfvsp-Qfdlt (5a)
Qfdlt＝Qfdlt+DQ (5b)
In S802, judge that whether fuel injection amount Qf is greater than limit injection amount Qflmt.When fuel injection amount Qf is big, replace fuel injection amount Qf with limit injection amount Qflmt, thus the fuel limitation emitted dose, afterwards, program enters S408.In the time except that above-mentioned, program directly enters S408.Processing subsequently is identical with above-mentioned processing.When judging fuel cut-off sign Fcut and be not 0 (S408), fuel injection amount Qf is set to 0 (S410), stops thereby fuel is sprayed.The fuel injection amount Qf of She Zhiing is set to export emitted dose Qfset (S409) in the above described manner, thereby makes sparger 21 work.
In the present embodiment, (function of and the S504 in the flow chart shown in Figure 8～S507) is corresponding to controlling component for whole flow chart shown in Figure 11.
In the present embodiment, in being provided with of limit injection amount Qflmt, fed back car speed VSP, thereby carried out adjustment limit injection amount Qflmt based on car speed VSP.Therefore, when unusual the generation, can accurately control car speed VSP, to suppress NO with predetermined value VSP1
XDischarging is till the urea water injection system obtains repairing.In addition, speed difference DLT is big more, and the variance ratio DQ of correcting value Qfdlt (being limit injection amount Qflmt) is calculated as big more value.Therefore, can be fast and make car speed VSP converge to predetermined value VSP1 smoothly.
Figure 13 illustrates unusual accelerator opening APO, the car speed VSP of front and back and the sequential chart of fuel injection amount (that is output emitted dose Qfset) Qf of taking place.At t1 constantly, when being in prison down accelerator pedal, the fuel injection amount Qf according to accelerator opening APO etc. is set, and car speed VSP increases.In the moment 2, when generation is unusual in the urea water injection system, so that (that is, variance ratio DQ) speed reduces output emitted dose Qfset, and car speed VSP is restricted to predetermined value VSP1 according to speed difference DLT.Constantly 3, when accelerator pedal is returned, and fuel injection amount Qf is when being lower than limit injection amount Qflmt, and fuel injection amount Qf is set to export emitted dose Qfset, thereby realizes slowing down.Afterwards, constantly 4, when giving as security down accelerator pedal once more, if also do not eliminate take place unusual in the urea water injection system, then limit injection amount Qflmt is set to export emitted dose Qfset, and the output of limiting engine 1.
In the present embodiment, car speed VSP is fed and is used for calculating limit injection amount Qflmt, makes car speed VSP consistent with predetermined value VSP1.Yet, also can forbid to surpass the speed motion of predetermined value VSP1 by limit injection amount Qflmt being carried out following the setting.That is to say, be stored among the motor C/U 51 as limit injection amount Qflmt in advance with the predetermined value VSP1 required fuel injection amount that on level road, moves.When unusual the generation, based among the fuel injection amount Qf of calculating such as accelerator opening APO and the limit injection amount Qflmt that is stored less one be set to export emitted dose Qfset.Preferably during running at high speed, can not reduce Engine torque suddenly.Therefore, by unconditionally selecting fuel injection amount Qf, up to after unusual the generation, having pass by till the predetermined amount of time, can postpone this predetermined amount of time with switch to limit injection amount Qflmt from fuel injection amount Qf, perhaps, can utilize the predetermined delay in the change of head for target value that limit injection amount Qflmt is set by using the limit injection amount of being stored as desired value.
In the above description, ammonia produces by hydrolysis of urea, but does not specify the catalyzer that is used for this hydrolysis.In order to improve hydrolysis efficiency, hydrolyst can be set at NO
XThe upstream of cleaning catalyst 33.
In addition, in the above description, illustrated to be used for wherein adopting ammonia as NO
XThe example of the situation of reducing agent.Yet, also can adopt hydrocarbon to replace ammonia.
As motor, can adopt diesel generator or gasoline engine generator except that the direct injection type.
Although according to several preferred embodiments the present invention has been described, scope of the present invention is not limited to this explanation, can be based on judging according to the disclosure in the scope of claims of using clause.
Claims (15)
1. engine controlling unit, it is configured to cooperate with motor, and this motor is installed on the vehicle, and comprises that the exhaust that is used for to this motor adds NO
xThe interpolation equipment of reducing agent, this engine controlling unit comprises the control unit that is used to control this motor, this engine controlling unit is characterised in that:
This control unit detects and has occurred in unusual in this interpolation equipment, and at this unusual time of origin when detecting unusual the generation, making in fuel duty of giving motor under driver's the same accelerator operation amount and the normal time unusual time of origin except that this gives the fuel duty of motor different, limiting the output of this motor, and
When unusual the generation, this control unit calculates first fuel duty that is used for car speed is controlled at predetermined value, also calculate second fuel duty according to accelerator operation amount, and with in this first fuel duty and this second fuel duty less one be set to final fuel duty.
2. engine controlling unit, it is configured to cooperate with motor, and this motor is installed on the vehicle, and comprises that the exhaust that is used for to this motor adds NO
xThe interpolation equipment of reducing agent, this engine controlling unit comprises the control unit that is used to control this motor, this engine controlling unit is characterised in that:
This control unit detects and has occurred in unusual in this interpolation equipment, and at this unusual time of origin when detecting unusual the generation, making in fuel duty of giving motor under driver's the same accelerator operation amount and the normal time unusual time of origin except that this gives the fuel duty of motor different, limiting the output of this motor, and
First fuel duty that the storage of this control unit is provided with as being used for car speed remained on the fuel duty of predetermined value in advance, and when unusual the generation, calculate second fuel duty according to accelerator operation amount, and with in this first fuel duty and this second fuel duty less one be set to final fuel duty.
3. engine controlling unit according to claim 1 and 2 is characterized in that, this control unit forbids resetting this engine running after this engine running stops.
4. engine controlling unit according to claim 3 is characterized in that, this control unit disconnects the connection between the power subsystem of the starter that is used to start this motor and this starter, thereby forbids resetting this engine running.
5. engine controlling unit according to claim 3 is characterized in that, this control unit is forbidden providing fuel to this motor, thereby forbids resetting this engine running.
6. engine controlling unit according to claim 1 and 2 is characterized in that, this control unit is stopping this engine running after beginning to have passed through predetermined amount of time unusually from detecting.
7. engine controlling unit according to claim 1 and 2 is characterized in that,
This motor comprises storage tank, and this storage tank is used for storing the NO that adds this exhaust by this interpolation equipment to
xThe aqueous solution of reducing agent or its precursor, and
Wherein, this control unit comprises first sensor, and this first sensor is used for detecting this NO that is included in the aqueous solution that this storage tank stores
xThe concentration of reducing agent or this precursor, and when being in beyond the prespecified range by the detected concentration value of this first sensor, detect in this interpolation equipment, take place unusual.
8. engine controlling unit according to claim 7 is characterized in that, this first sensor comprises the sensor element part that is arranged in this storage tank, and the circuit part that is connected to this sensor element part, wherein
This sensor element partly comprises heater and temperature-sensing element, this temperature-sensing element be configured to this storage tank in the aqueous solution contact directly or indirectly, and this temperature-sensing element is heated by this heater, this temperature-sensing element has the attribute that its electric properties value changes according to its temperature, and
This circuit part drives this heater and detects the electric properties value of this temperature-sensing element after heating, and detects this NO based on detected electric properties value
xThe concentration of reducing agent or this precursor.
9. engine controlling unit according to claim 1 and 2 is characterized in that,
This motor comprises storage tank, and this storage tank is used for storing the NO that adds this exhaust by this interpolation equipment to
xThe aqueous solution of reducing agent or its precursor, and
Wherein, this control unit comprises second sensor, this second sensor is used for detecting the aqueous solution residual capacity that is stored in this storage tank, and when by this second sensor to the value of residual capacity during less than predetermined value, detect in this interpolation equipment, take place unusual.
10. engine controlling unit according to claim 1 and 2 is characterized in that, this NO
xReducing agent is an ammonia.
11. engine controlling unit according to claim 10 is characterized in that, this interpolation equipment adds the precursor of urea as ammonia in this exhaust to, thereby has added NO
xReducing agent.
12. engine controlling unit according to claim 1 and 2 is characterized in that, when unusual generation, this control unit is used in the apartment warning work of notifying the driver that unusual generation is arranged.
13. engine controlling unit according to claim 1 and 2 is characterized in that, comprising: first control unit is used to control this motor; And second control unit, be used to control this interpolation equipment, wherein
This second control unit is all controlled this interpolation equipment normal time unusual time of origin when unusual the generation and except that this, and
This second control unit makes this interpolation equipment work in normal time, to add the NO according to the amount of engine operating status
xReducing agent, and when unusual the generation, stop to add NO by this interpolation equipment
xReducing agent.
14. one kind is used for this unusual time of origin when unusual taking place when interpolation equipment and making the method for engine running except that this normal time the unusual time of origin, this interpolation equipment is set in this motor, with NO
xReducing agent adds in the exhaust of this motor, the method is characterized in that may further comprise the steps:
In normal time, make this engine running with first characteristic, the output of acquisition and driver's corresponding this motor of accelerator operation amount in this first characteristic, wherein, detect the operating condition of this motor, and by the NO of this interpolation equipment interpolation with the corresponding amount of detected operating condition
xReducing agent; And
At unusual time of origin, make this engine running with second characteristic, in this second characteristic, make the fuel duty of under identical accelerator operation amount, giving motor different to the fuel duty of motor with normal time, wherein, calculating is used for car speed is controlled at first fuel duty of predetermined value, also calculates second fuel duty according to accelerator operation amount, and with in this first fuel duty and this second fuel duty less one be set to final fuel duty.
15. one kind is used for this unusual time of origin when unusual taking place when interpolation equipment and making the method for engine running except that this normal time the unusual time of origin, this interpolation equipment is set in this motor, with NO
xReducing agent adds in the exhaust of this motor, the method is characterized in that may further comprise the steps:
In normal time, make this engine running with first characteristic, the output of acquisition and driver's corresponding this motor of accelerator operation amount in this first characteristic, wherein, detect the operating condition of this motor, and by the NO of this interpolation equipment interpolation with the corresponding amount of detected operating condition
xReducing agent; And
At unusual time of origin, make this engine running with second characteristic, in this second characteristic, make the fuel duty of under identical accelerator operation amount, giving motor different to the fuel duty of motor with normal time, wherein, first fuel duty is set in advance to being used for car speed is remained on the fuel duty of predetermined value, calculate second fuel duty according to accelerator operation amount, and with in this first fuel duty and this second fuel duty less one be set to final fuel duty.
Applications Claiming Priority (3)
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| JP362411/2003 | 2003-10-22 | ||
| JP2003362411 | 2003-10-22 | ||
| JP026056/2004 | 2004-02-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103814212A (en) * | 2011-08-22 | 2014-05-21 | 康明斯排放处理公司 | Urea solution pumps having leakage bypass |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7992377B2 (en) * | 2006-12-14 | 2011-08-09 | GM Global Technology Operations LLC | Diesel exhaust control during limp-home mode |
| US7946109B2 (en) * | 2006-12-14 | 2011-05-24 | GM Global Technology Operations LLC | Emissions conformance for an exhaust after-treatment system having a dosing agent supply |
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| CN101793186A (en) * | 2010-03-11 | 2010-08-04 | 北汽福田汽车股份有限公司 | Reactant alarm control device and method for an SCR system |
| JP5617348B2 (en) * | 2010-05-17 | 2014-11-05 | いすゞ自動車株式会社 | SCR system |
| US8813723B2 (en) * | 2011-05-20 | 2014-08-26 | GM Global Technology Operations LLC | System and method for detecting a stuck fuel injector |
| US9010087B1 (en) * | 2013-11-13 | 2015-04-21 | Ford Global Technologies, Llc | Method and system for NOx sensor degradation |
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| US10690079B2 (en) * | 2017-12-12 | 2020-06-23 | GM Global Technology Operations LLC | Method for diagnosing and controlling ammonia oxidation in selective catalytic reduction devices |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071852A (en) * | 1991-10-14 | 1993-05-12 | 株式会社荏原制作所 | Exhaust gas denitration method and device thereof |
| JP2002242780A (en) * | 2001-02-16 | 2002-08-28 | Toyota Motor Corp | Fuel supply unit for internal combustion engine |
| JP2002371831A (en) * | 2001-06-13 | 2002-12-26 | Nissan Diesel Motor Co Ltd | Exhaust emission control device of automobile |
| JP2003214223A (en) * | 2002-01-22 | 2003-07-30 | Fuji Heavy Ind Ltd | Start control device for electronic-controlled throttle type engine |
| JP2003254048A (en) * | 2002-02-26 | 2003-09-10 | Denso Corp | Control device for internal combustion engine |
| JP2003529011A (en) * | 1999-06-09 | 2003-09-30 | クリーン ディーゼル テクノロジーズ インコーポレーテッド | Method and composition for ensuring reduction of NOx emissions from an engine by selective catalytic reduction |
-
2004
- 2004-09-13 CN CNB2004800314215A patent/CN100416054C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071852A (en) * | 1991-10-14 | 1993-05-12 | 株式会社荏原制作所 | Exhaust gas denitration method and device thereof |
| JP2003529011A (en) * | 1999-06-09 | 2003-09-30 | クリーン ディーゼル テクノロジーズ インコーポレーテッド | Method and composition for ensuring reduction of NOx emissions from an engine by selective catalytic reduction |
| JP2002242780A (en) * | 2001-02-16 | 2002-08-28 | Toyota Motor Corp | Fuel supply unit for internal combustion engine |
| JP2002371831A (en) * | 2001-06-13 | 2002-12-26 | Nissan Diesel Motor Co Ltd | Exhaust emission control device of automobile |
| JP2003214223A (en) * | 2002-01-22 | 2003-07-30 | Fuji Heavy Ind Ltd | Start control device for electronic-controlled throttle type engine |
| JP2003254048A (en) * | 2002-02-26 | 2003-09-10 | Denso Corp | Control device for internal combustion engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103814212A (en) * | 2011-08-22 | 2014-05-21 | 康明斯排放处理公司 | Urea solution pumps having leakage bypass |
| CN103814212B (en) * | 2011-08-22 | 2016-04-20 | 康明斯排放处理公司 | There is the urea solution pump leaking bypass |
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