CN101603469B - Regeneration device for exhaust gas sensor and gas control system using the regeneration device - Google Patents
Regeneration device for exhaust gas sensor and gas control system using the regeneration device Download PDFInfo
- Publication number
- CN101603469B CN101603469B CN2009101390812A CN200910139081A CN101603469B CN 101603469 B CN101603469 B CN 101603469B CN 2009101390812 A CN2009101390812 A CN 2009101390812A CN 200910139081 A CN200910139081 A CN 200910139081A CN 101603469 B CN101603469 B CN 101603469B
- Authority
- CN
- China
- Prior art keywords
- egt
- exhaust
- gas
- control unit
- abgassensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1474—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method by detecting the commutation time of the sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention provides a detection unit for detecting response time (CTP) of an exhaust gas sensor. When an estimation unit estimates that the CTP is not less than predetermined time, an exhaust gas temperature unit increases temperature (ET) of the exhaust gas, and a flow speed control unit increases flow speed of the exhaust gas. Therefore, a regeneration device may remove particle attached on the exhaust gas sensor, the exhaust gas sensor detects exhaust gas component in an exhaust gas channel of an internal combustion engine. The invention further relates to a regeneration device and an gas control system using the regeneration device.
Description
Technical field
The present invention relates to a kind of reclaimer that is used for Abgassensor, and a kind of gas control system that uses said reclaimer.
Background technique
JP-A-2006-505738 (corresponding with US 2007/0006576A1) discloses a kind of particulate cleaning device, for example diesel particulate filter (DPF).DPF collects (capture) and enters the particulate the exhaust steam passage (exhaust passage) from internal-combustion engine.Therefore, DPF prevents that the toxic component of particulate from entering air.Fuel is added in the waste gas, so that the EGT of waste gas is raise, like this, the particulate of being collected by DPF is burnt.Therefore, DPF can regenerate.
The toxic component that enters exhaust steam passage from internal-combustion engine needs further to reduce, and becomes strict because forbid the rules of discharging toxic component.Therefore, air inlet and exhaust need be based on accurately controlling the exhaust gas constituents in the said sensor exhaust steam passage from the signal of Abgassensor output.Abgassensor is air fuel ratio (A/F) sensor, oxygen sensor or nitrogen oxide (NOx) sensor.Gas control to the air inlet that imports internal-combustion engine and from exhaust gas of internal combustion engines one of them and carry out.Gas control can be directed against air inflow, exhaust gas recirculation (EGR) amount or turbosupercharger inflation pressure and carry out.
Abgassensor generally includes sensor element, and its tegmentum covers, and is dipped in the water to prevent sensor element.Waste gas is gone into Abgassensor through the orifice flow that is arranged in the said lid.
But the particulate that is included in the waste gas possibly adhere on the Abgassensor, because the Abgassensor that is arranged in the exhaust steam passage is exposed in the waste gas.If the hole of said lid is filled up by particulate, then waste gas can not flow around the sensor element of Abgassensor.Like this, just need long duration make the corresponding signal of exhaust gas constituents of Abgassensor output and contiguous Abgassensor.That is to say that Abgassensor may not accurately detect the exhaust gas constituents in the exhaust steam passage.So air inlet or exhaust may not accurately be controlled based on exhaust gas constituents to be detected.
Therefore, Abgassensor needs regeneration.Here, DPF is regenerated by the particulate that DPF collects through burning.The response time of Abgassensor need adhere to particulate and initialization on the Abgassensor through burning.
But the initialization of only carrying out the response time of Abgassensor through the rising EGT is difficult.Abgassensor can be regenerated through the frequent fuel that adds in waste gas, so that shorten the interval that promotes EGT.But the device that is arranged in the exhaust steam passage must bear the load that EGT raises continually.In addition, the mileage oil consumption also maybe be relatively poor.
Summary of the invention
Consider aforesaid problem with other, the purpose of this invention is to provide a kind of reclaimer that is used for Abgassensor.Another object of the present invention provides a kind of gas control system that uses said reclaimer.
According to first example of the present invention, a kind of reclaimer is removed the particulate that adheres on the Abgassensor that detects exhaust gas constituents in the engine exhaust gas passage.Said reclaimer comprises detection unit, identifying unit, EGT control unit and flow speed control unit.The response time of detection Abgassensor.Identifying unit judges whether response time equals or be longer than scheduled duration.When identifying unit judgement response time equaled or is longer than scheduled duration, EGT control unit control EGT raised portion was with the EGT in the rising exhaust steam passage.When identifying unit judgement response time equaled or is longer than scheduled duration, flow speed control unit controls flow velocity improved part, to improve the flow velocity of waste gas in the exhaust steam passage.
Therefore, the particulate that adheres on the Abgassensor is burnt, so that Abgassensor can be regenerated.
According to second example of the present invention, a kind of gas control system that is used to control air inlet or exhaust comprises Abgassensor, reclaimer and gas control unit.Exhaust gas constituents in the exhaust steam passage of Abgassensor detection internal-combustion engine.Reclaimer is removed and is adhered to the particulate on the Abgassensor.The gas control unit is based on air inlet of output SC sigmal control or exhaust from Abgassensor output.
Therefore, gas control system can be based on accurately controlling air inlet or exhaust from the output signal of Abgassensor output, and said Abgassensor is through reclaimer regeneration.
According to the 3rd example of the present invention, the gas control system of a kind of air inlet that is used for controlling combustion engine or exhaust comprises that Abgassensor, electronic control unit, EGT raised portion and flow velocity improve part.Exhaust gas constituents in the exhaust steam passage of Abgassensor detection internal-combustion engine.Electronic control unit detects the response time of Abgassensor, and judges whether said response time equals or be longer than scheduled duration.The EGT of waste gas in the EGT raised portion rising exhaust steam passage.Flow velocity improves the flow velocity that part improves waste gas in the exhaust steam passage.When electronic control unit judgement response time equaled or is longer than scheduled duration, said electronic control unit controls EGT raised portion was with the EGT of waste gas in the rising exhaust steam passage.When electronic control unit judgement response time equaled or is longer than scheduled duration, said electronic control unit controls flow velocity improved part, to improve the flow velocity of waste gas in the exhaust steam passage.
Therefore, Abgassensor can be regenerated, so that gas control system can be based on accurately controlling air inlet or exhaust from the output signal of Abgassensor output.
Description of drawings
Above-mentioned and other purposes, feature and advantage of the present invention will become more obvious through the detailed description of having done with reference to the accompanying drawings.In the accompanying drawings:
Figure 1A is the block diagram that illustrates according to the gas control system of the control air inlet of first mode of execution or exhaust, and Figure 1B is the sectional view that the Abgassensor of gas control system is shown;
Fig. 2 is the flow chart that the reproducer of Abgassensor is shown;
Fig. 3 is the flow chart that illustrates according to the reproducer of the Abgassensor of the gas control system of the control air inlet of second mode of execution or exhaust.
Embodiment
(first mode of execution)
The gas control system 10 of first mode of execution will be described with reference to Figure 1A below.
AFM 12 detects the air inflow that flows into DENG 2.EGR valve 20 is arranged in exhaust gas recirculation (EGR) passage 110, and said exhaust gas recirculation passage 110 connects the air inlet side and the exhaust gas side of DENG 2.The exhausted air quantity of EGR valve 20 controls from exhaust gas side to the recirculation of air inlet side.
It is the cellular structure of the oxidation catalyst of platinum for example that DOC 30 has support, and the fuel that the postinjection through Fuelinjection nozzle 4 is ejected in the exhaust steam passage 100 carries out oxidation.The EGT of exhaust steam passage 100 raises through the reaction heat of oxidation.
Exhaust gas temperature sensor 60 is positioned at the downstream side of electric fan 50, and is positioned at the upstream side of A/F sensor 70.Exhaust gas temperature sensor 60 detects the temperature of the waste gas of contiguous A/F sensor 70.
A/F sensor 70 is equivalent to Abgassensor.For example, A/F sensor 70 detects the air/fuel ratio based on limited current, and said limited current depends on the oxygen concentration in the waste gas.Alternatively, oxygen (O
2) sensor also can be used as Abgassensor.Said oxygen sensor produces electromotive force based on the oxygen density in the waste gas.
A/F sensor 70 is positioned at the downstream side of exhaust gas temperature sensor 60, and is positioned at the upstream side of DPF 40.The air/fuel ratio that A/F sensor 70 detects in the exhaust steam passage 100.Shown in Figure 1B, the sensor element 72 of cylindrical enclosing cover 74 and cylindrical inner cap 80 covering A/F sensors 70.For example, sensor element 72 be cup for example the columniform solid electrolyte in bottom arranged.Alternatively, sensor element 72 can be plate shape, and the solid electrolyte layered arrangement is in wherein.
ECU 90 is equivalent to be used for the reclaimer of Abgassensor, and comprises CPU, RAM, ROM, for example is the recordable memory of flash memory, I/O interface or the like (not shown).ECU 90 obtains engine operating state information according to the signal by outputs such as AFM 12, exhaust gas temperature sensor 60, A/F sensor 70, engine rotation sensor (not shown), accel sensor (not shown).
ECU 90 is based on the injection timing of the engine operating state information Control Fuelinjection nozzle that is obtained 4 injections and the emitted dose of Fuelinjection nozzle 4 injections.In addition, ECU 90 is based on the engine operating state information and executing multi-stage jet that is obtained.Multi-stage jet is made up of main injection, pre-spray, back injection, pilot injection, postinjection etc.Main injection produces the main torque that is used for motor 2.Pre-spray was carried out before main injection.After be injected in after the main injection and carry out.Pilot injection was carried out before pre-spray.Postinjection is carried out after spray the back.
Pilot injection is performed, so that be pre-mixed air and small amount of fuel before lighting of main injection.Pre-spray is performed, so that before main injection, make the fuel combustion in the firing chamber through spraying small amount of fuel.Like this, can avoid the rapid combustion of main injection.Therefore, can reduce burning sound and combustion vibration.
The back is sprayed and is performed, with purifying exhaust air.A spot of fuel is sprayed after main injection, and like this, particulate is burnt.Particulate is the not combustion composition that is produced by main injection in the firing chamber.When carrying out the back injection, from the EGT rising of motor 2 exhaust gas discharged through Fuelinjection nozzle 4.Postinjection is carried out through spraying small amount of fuel, so that the particulate that burning is collected by DPF 40.
Control program is stored in the storage of ROM or ECU 90.ECU 90 comprises the gas control unit, be used to detect the detection unit of response time, be used to judge identifying unit, flow speed control unit and the EGT control unit of said response time.
Below the gas control unit will be described.ECU 90 calculates the target air inflow according to the mapping chart based on engine revolution and engine loading.Air inflow changes according to the EGR gas flow.ECU 90 is through changing the aperture control EGR gas flow of EGR valve 20, so that obtain the target air inflow.In this case, ECU 90 is based on the actual air inflow of input from 70 outputs of A/F sensor.ECU 90 control EGR gas flows are so that actual air inflow roughly equates with the target air inflow.For example, when the actual air inflow that detects during greater than the target air inflow, ECU 90 reduces air inflow through increasing the EGR gas flow.On the contrary, when the actual air inflow that detects during less than the target air inflow, ECU 90 increases air inflow through reducing the EGR gas flow.Like this, ECU 90 is based on the output SC sigmal control EGR gas flow from 70 outputs of A/F sensor, so that control air inlet or exhaust.Alternatively, ECU 90 can be based on the aperture of the output SC sigmal control suction valve of exporting from Abgassensor or the inflation pressure of turbosupercharger, so that control air inlet or exhaust.
Below detection unit will be described.When accelerator was released owing to the driving of slowing down, ECU 90 stopped to spray from the fuel of Fuelinjection nozzle 4, so that exhaust steam passage 100 is substantially equal to atmospheric pressure.At this moment, ECU 90 detects the response time of A/F sensor 70, and it is restricted at ECU 90 and stops when the fuel of Fuelinjection nozzle 4 sprays, to start, and when the value of exporting from A/F sensor 70 that the output signal becomes with atmospheric pressure conforms to, stops.
If the ratio of the air/fuel in the exhaust steam passage 100 can be estimated based on engine operating state; The response time of A/F sensor 70 can be restricted to when engine operating state is changed into predetermined state and start so, and when the output signal from 70 outputs of A/F sensor becomes estimated ratio, stops.
Below identifying unit will be described.As stated, the opening 76 of enclosing cover 74 and the opening 82 of inner cap 80 offset with respect to each, and like this, the sensor element 72 of A/F sensor 70 promptly is difficult to soak in water.But waste gas possibly be difficult to around the sensor unit 72 of A/F sensor 70, flow.If waste gas can be through the opening 76,82 that offsets with respect to each, waste gas can flow around the sensor element 72 of A/F sensor 70 so.Like this, A/F sensor 70 can accurately detect the air/fuel ratio in the exhaust steam passage 100.
Here, the particulate of waste gas possibly adhere on enclosing cover 74 and the inner cap 80, because A/F sensor 70 is exposed in the waste gas.The opening 76,78 of enclosing cover 74 or the opening 82,84 of inner cap 80 possibly filled up by particulate.When waste gas was difficult to through opening 76,78,82,84, waste gas possibly be prevented from flowing to proximity sensor element 72.In this case, the response time of the A/F sensor 70 of the air/fuel ratio in the detection exhaust steam passage 100 is elongated.That is to say that the response time of A/F sensor 70 is owing to the particulate that adheres on the A/F sensor 70 postpones.
ECU 90 judges whether response times equal or be longer than scheduled duration.Response time is restricted to when engine operating state is changed into predetermined state and starts, and stops than the time and become estimated air/fuel at the output signal from 70 outputs of A/F sensor.When engine operating state was in predetermined state, the air/fuel ratio can be estimated based on engine operating state.When the response time of A/F sensor 70 equaled or is longer than scheduled duration, ECU 90 judged that the opening 76,78,82,84 of A/F sensors 70 is filled up by particulate.
Use description to control the flow speed control unit of waste gas flow velocity below.When the response time of A/F sensor 70 equaled or is longer than scheduled duration, ECU 90 judged that the particulate that adheres on the A/F sensor 70 need remove through burning.Therefore, spray the back or postinjection will be performed, so that the EGT of exhaust steam passage 100 is raise.In addition, the waste gas flow velocity possibly be higher than predetermined speed.When the flow velocity of waste gas was higher than predetermined speed, the particulate that adheres on the A/F sensor 70 can easily separate with A/F sensor 70.In addition, the particulate that adheres on the inner cap 80 of A/F sensor 70 can easily be burnt, because the opening 76,78 of the waste gas that temperature raises through enclosing cover 74 arrives inner caps 80.Therefore, when the flow velocity of waste gas was equal to or less than predetermined speed, ECU 90 power supplies were to start electric fan 50.Electric fan 50 is equivalent to be used to improve the flow velocity raising part of waste gas flow velocity.Therefore, the flow velocity of the waste gas in the exhaust steam passage 100 can be higher than predetermined speed.
When the flow velocity of waste gas was higher than predetermined speed, electric fan 50 was not activated.
Use description to control the EGT control unit of the EGT of waste gas below.When the response time of A/F sensor 70 equaled or is longer than scheduled duration, ECU 90 judged that the particulate that adheres on the A/F sensor 70 need be eliminated through burning.Therefore, the EGT of exhaust steam passage 100 needs to raise.Then, when EGT was equal to or less than predetermined temperature, ECU 90 order Fuelinjection nozzles 4 were carried out the postinjection in back injection and the postinjection.Like this, the EGT of exhaust steam passage 100 can be higher than predetermined temperature.
When EGT was higher than predetermined temperature, sprayed the back and postinjection is not performed.
Next, the regenerative process of A/F sensor 70 will be described with reference to the reproducer of Fig. 2.The reproducer of Fig. 2 is carried out continuously.ECU 90 is stored in control program and the reproducer of execution graph 2 in the storage of ROM or ECU 90 through execution.
In step S300, ECU 90 detects the air fuel ratio as sensor values based on the output signal of exporting from the A/F sensor 70 that is equivalent to Abgassensor.Then, calculate the response time of A/F sensor 70 based on air/fuel ratio to be detected with according to the estimative air/fuel ratio that the preset engine running state estimates.
In step S302, ECU 90 judges whether the response time CTP of A/F sensors 70 equals or be longer than scheduled duration R1.(S302: in the time of not), program stops when response time CTP is shorter than scheduled duration R1.
When the response time CTP of A/F sensor 70 equaled or is longer than scheduled duration R1 (S302: be), in step S304, ECU 90 judged whether the flow rate F R of the waste gas in the exhaust steam passage 100 is equal to or less than predetermined speed V1.ECU 90 detects flow rate F R based on engine revolution, because when engine revolution increases, flow rate F R improves.
When flow rate F R was equal to or less than predetermined speed V1 (S304: be), in step S306, ECU 90 supplied with to electric fan 50.Like this, flow rate F R improves.Then, program forwards S308 to.
(S304: in the time of not), in step S308, ECU 90 judges whether the EGT ET of waste gas in the exhaust steam passage 100 is equal to or less than predetermined temperature K1 when flow rate F R is higher than predetermined speed V1.ECU90 is based on the input EGT ET from exhaust gas temperature sensor 60 outputs.(S308: in the time of not), ECU 90 is with terminator when EGT ET is higher than predetermined temperature K1.
When EGT ET was equal to or less than predetermined temperature K1 (S308: be), in step S310, ECU 90 judged whether the EGT ET of waste gas in the exhaust steam passage 100 is equal to or less than predetermined temperature K2.Here, predetermined temperature K1 is higher than predetermined temperature K2.(S310: in the time of not), in step S312, ECU 90 order Fuelinjection nozzles 4 are carried out postinjection when EGT ET is higher than predetermined temperature K2.Because postinjection, the EGT ET of exhaust steam passage 100 raises, and program will stop.
When EGT ET was equal to or less than predetermined temperature K2 (S310: be), in step S314, ECU 90 order Fuelinjection nozzles 4 were carried out the back and are sprayed.And in step S312, ECU 90 order Fuelinjection nozzles 4 are carried out postinjection.Because spray and postinjection the back, the EGT ET of exhaust steam passage 100 raises, and program will stop.
According to first mode of execution, when the response time of A/F sensor 70 equals or is longer than scheduled duration R1, carry out at least the back spray with postinjection in postinjection so that the EGT rising.In addition, the flow velocity of waste gas improves through starting electric fan.Thus, the particulate on adhering to A/F sensor 70 is not when only the rising through EGT is eliminated, because the raising of waste gas flow velocity, the particulate that adheres on the A/F sensor 70 can be removed through burning.Therefore, the response time of A/F sensor 70 can be shortened, and like this, air inlet or exhaust can be based on accurately being controlled from the output signal of A/F sensor 70 outputs.
In addition, because the rising of the EGT of waste gas and the raising of waste gas flow velocity, the particulate that adheres on the A/F sensor 70 can be eliminated through single regenerative process effectively.Like this, A/F sensor 70 can be regenerated under the situation of the quantity that does not increase regenerative process.The rising that can reduce owing to EGT thus, is applied to the load on the device that is arranged in the exhaust steam passage 100.In addition, can reduce be used to make the A/F sensor 70 needed fuel of regeneration and.
(second mode of execution)
The structure of the gas control system 10 of second mode of execution is identical with first mode of execution basically.Control program is stored in the storage of ROM or ECU 90.The ECU 90 of second mode of execution also comprises the regeneration period estimation unit of the period that is used to estimate to regenerate.
Regeneration period estimation unit will be described below.Because the particulate that DPF 40 collects in the exhaust steam passage 100 is so particulate is accumulated among the DPF 40.When having accumulated the particulate of prearranging quatity, the collecting efficiency that DPF 40 collects particulate reduces.Therefore, DPF 40 need regenerate through making the particle burning that is collected.ECU 90 estimates to be accumulated in the particulate loading among the DPF 40 based on the historical record of the running state of motor 2.Then, ECU 90 estimates the regeneration period of the process before regenerative process, to remove the particulate of accumulating among the DPF 40 through burning.
Because regeneration period estimation unit; The flow speed control unit that is used to control the waste gas flow velocity of second mode of execution can have another operation, and the EGT control unit of EGT that is used to control the waste gas of second mode of execution can have another operation.
Use description to control the flow speed control unit of waste gas flow velocity below.When postinjection is performed so that during the particulate of accumulating among the DPF 40 that burns, the EGT in the exhaust steam passage 100 raises.At this moment, the particulate that adheres on the A/F sensor 70 also can burn in the regenerative process of DPF 40.Therefore, when the estimated regeneration period of process before the regenerative process startup at DPF 40 equaled or is shorter than scheduled time slot, even the response time of A/F sensor 70 equals or is longer than scheduled duration, ECU 90 can not start electric fan 50 yet.That is to say that if the regenerative process of DPF 40 starts relatively shortly, the flow velocity of waste gas can not be enhanced so.
Use description to control the EGT control unit of the EGT of waste gas below.As stated, the particulate that adheres on the A/F sensor 70 also can burn in the regenerative process of DPF 40.Therefore; When the estimated regeneration period of process before the regenerative process startup at DPF 40 equals or is shorter than scheduled time slot; Even the response time of A/F sensor 70 equals or is longer than scheduled duration, ECU 90 can not order Fuelinjection nozzle 4 to carry out postinjection yet.That is to say that if the regenerative process of DPF 40 starts relatively shortly, the EGT of waste gas can not raise so before DPF 40 regeneration.
Being used to estimate to regenerate the scheduled time slot of period will be as the Requirements of the EGT that is used to judge the flow velocity that whether improves waste gas or rising waste gas.Confirm scheduled time slot based on the amount of electricity that A/F sensor 70 regeneration is consumed or fuel.In addition, the deterioration degree that equals or be longer than institute's exhaust gas discharged that the state continuance of scheduled duration causes based on the response time owing to A/F sensor 70 is confirmed scheduled time slot.
Use description to stop the gas control of gas control to stop the unit below.When the response time of A/F sensor 70 equals or is longer than scheduled duration; And when the regeneration period of process before the regenerative process startup at DPF 40 equaled or is shorter than scheduled time slot, ECU 90 stopped gas control based on the output signal from 70 outputs of A/F sensor.But gas control is based on carrying out from the output signal of AFM 12 outputs.The gas control based on the output signal of exporting from AFM 12, the amount of EGR is controlled, and like this, actual air inflow becomes the target air inflow.
Next, the regenerative process of the A/F sensor 70 of second mode of execution will be described with reference to the reproducer of Fig. 3.The reproducer of Fig. 3 is carried out continuously.ECU 90 is stored in control program and the reproducer of execution graph 3 in the storage of ROM or ECU 90 through execution.Because the process S328-S338 of Fig. 3 and the process S304-S314 of Fig. 2 are similar, with the description of the process S328-S338 that omits Fig. 3.
In the step S320 of Fig. 3, ECU 90 judges whether gas control is performed based on the output signal of exporting from the A/F sensor 70 that is equivalent to Abgassensor.(S320: in the time of not), ECU 90 is with terminator when gas control is not performed based on the output signal of exporting from A/F sensor 70.In this case, ECU 90 is based on carrying out gas control from the output signal of AFM 12 outputs.
When gas control was performed (S320: be) based on the output signal of exporting from A/F sensor 70, in step S322, ECU 90 was based on the air/fuel ratio of the output input of exporting from A/F sensor 70 as sensor values.Then, compare based on detected air/fuel and compare and the response time of calculating A/F sensor 70 by the estimative air/fuel that predetermined engine operating state estimates.
In step S324, ECU 90 judges whether the response time CTP of A/F sensors 70 equals or be longer than scheduled duration R1.(S324: in the time of not), program will stop when response time CTP is shorter than scheduled duration R1.
When the response time CTP of A/F sensor 70 equaled or is longer than scheduled duration R1 (S324: be), in step S326, ECU 90 judged whether the regeneration period RP of process before the regeneration of DPF 40 equals or be shorter than scheduled time slot T1.When regeneration period RP is longer than predetermined value T1 (S326: deny), ECU 90 implementation S328-S338, it is similar with the process S304-S314 of Fig. 2 basically.Then, program stops.
When regeneration period RP equals or when being shorter than predetermined value T1 (S326: be), in step S340, ECU does not improve the waste gas flow velocity in 90 control flow speed control unit, even the response time CTP of A/F sensor 70 equals or is longer than scheduled duration R1 (S324: be).And, in step S340, the do not raise EGT of waste gas of ECU 90 control EGT control units.This is to be judged as relatively shortly in the regenerative process of the DPF that starts 40 and to burn because adhere to particulate on the A/F sensor 70.
When the response time CTP of A/F sensor 70 equaled or is longer than scheduled duration R1 (S324: be), ECU 90 judged that gas control can not accurately be performed based on the output signal from 70 outputs of A/F sensor.Then, in step S340, stop based on the gas control from the output signal of A/F sensor 70 output, program stops.
According to second mode of execution, even the response time CTP of A/F sensor 70 equals or is longer than scheduled duration R1, when regeneration period RP equaled or is shorter than scheduled time slot T1, the flow velocity of waste gas can not be enhanced through the flow speed control unit yet.In addition, the EGT of waste gas can not be raised through the EGT control unit.The particulate that adheres on the A/F sensor 70 will be eliminated in the regenerative process of DPF 40.
Thus, spray and the less execution of postinjection quilt the back.Spray the back and the number of executions of postinjection is reduced, because spray the back and postinjection mainly is performed when DPF 40 regeneration.Like this, can improve the mileage oil consumption.In addition, can reduce the oil dilution that when the fuel of postinjection adheres on the cylinder wall, produces.In addition, because can reduce to be applied to the load on the device that is arranged in the exhaust steam passage 100, therefore can reduce the infringement of device owing to the rising of EGT.
In addition, electric fan 50 is by less starting, because the flow velocity of waste gas has reduced.Like this, can reduce electric consumption.
In the above-described embodiment, Abgassensor is A/F sensor 70 or O
2Sensor.Alternatively, the Abgassensor of the exhaust gas constituents in the detection exhaust steam passage 100 can be nitrogen oxide (NOx) sensor.When various sensor's response durations were elongated owing to the adhesion of exhaust gas particle, reclaimer can be used to said various sensor.
In the above-described embodiment, it is electric fan 50 that the flow velocity that is used for improving the flow velocity of exhaust steam passage 100 waste gas improves part.Alternatively, it can be solenoid valve that flow velocity improves part, and it changes the circulation area of exhaust steam passage 100.The flow velocity of waste gas can be enhanced through the circulation area that is reduced exhaust steam passage 100 by solenoid valve in the exhaust steam passage 100.
In the above-described embodiment, carry out the postinjection in back injection and the postinjection at least, so that the EGT of waste gas in the rising exhaust steam passage 100.Alternatively, the EGT of waste gas can raise through the fuel addition valve that is arranged in exhaust gas temperature sensor 60 upstream sides in the exhaust steam passage 100, and said fuel addition valve directs injection of fuel in the exhaust steam passage 100.In this case, can be used to make DPF 40 regeneration through the fuel addition valve injected fuel.
Such change and modification will be understood that to be included in the scope of the present invention that is limited by the accompanying claims.
In addition, when Abgassensor was suitably regenerated, the gas control unit can accurately be controlled the amount of EGR based on the output signal of exporting from Abgassensor.Therefore, with the toxic component in reducing from the engine exhaust to the exhaust steam passage.
Unit in the top mode of execution is realized through the hardware resource with structure and/or program.In addition, said unit is not limited to the unit realized through physically independent hardware resource.
Claims (9)
1. the reclaimer (90) of Abgassensor (70) regeneration of an exhaust gas constituents that is used for making the exhaust steam passage (100) that detects internal-combustion engine (2), said reclaimer (90) comprising:
Be used to detect the detection unit (S300, S322) of the response time of Abgassensor (70);
Be used to judge whether said response time equals or be longer than the identifying unit of scheduled duration (R1) (S302, S324);
EGT control unit (S312, S336); It is used for judging that said response time (CTP) equals or when being longer than said scheduled duration (R1) at said identifying unit (S302, S324); Control EGT raised portion (4); With the EGT (ET) of waste gas in the rising exhaust steam passage (100), adhere to the particulate on the said Abgassensor (70) so that remove;
Flow speed control unit (S306, S330); It is used for judging that said response time (CTP) equals or when being longer than said scheduled duration (R1) at said identifying unit (S302, S324); The control flow velocity improves part (50); To improve the flow velocity (FR) of waste gas in the exhaust steam passage (100), adhere to the particulate on the Abgassensor (70) so that remove.
2. reclaimer as claimed in claim 1 (90) is characterized in that,
When said response time (CTP) equals or is longer than said scheduled duration (R1) and when said flow velocity (FR) is equal to or less than predetermined speed (V1); Said flow speed control unit (S306, S330) the said flow velocity of control improves part (50); With the flow velocity (FR) of waste gas in the raising exhaust steam passage (100), and
When said response time (CTP) equals or is longer than said scheduled duration (R1) and when said flow velocity (FR) is higher than said predetermined speed (V1); Said flow speed control unit (S306, S330) the said flow velocity of control improves part (50), to forbid improving the flow velocity (FR) of waste gas in the exhaust steam passage (100).
3. reclaimer as claimed in claim 1 (90) is characterized in that,
When said response time (CTP) equals or is longer than said scheduled duration (R1) and when said EGT (ET) is equal to or less than predetermined temperature (K1); Said EGT control unit (S312, S336) control said EGT raised portion (4); With the EGT (ET) of waste gas in the rising exhaust steam passage (100), and
When said response time (CTP) equals or is longer than said scheduled duration (R1) and when said EGT (ET) is higher than said predetermined temperature (K1); Said EGT control unit (S312, S336) control said EGT raised portion (4) is with the EGT (ET) of waste gas in the exhaust steam passage (100) of forbidding raising.
4. like the described reclaimer (90) among the claim 1-3, it is characterized in that, also comprise:
Regeneration period estimation unit (S326), its be used for estimating before the regeneration of the particulate filter that is used to collect the waste gas particulate (40) starts regeneration period (RP) of process, wherein
When said response time (CTP) equals or is longer than said scheduled duration (R1) and when the said regeneration period (RP) equals or be shorter than scheduled time slot (T1); Said flow speed control unit (S306, S330) the said flow velocity of control improves part (50); Forbidding improving the flow velocity (FR) of waste gas in the exhaust steam passage (100), and
When said response time (CTP) equals or is longer than said scheduled duration (R1) and when the said regeneration period (RP) equals or be shorter than said scheduled time slot (T1); Said EGT control unit (S312, S336) control said EGT raised portion (4) is with the EGT (ET) of waste gas in the exhaust steam passage (100) of forbidding raising.
5. reclaimer as claimed in claim 4 (90) is characterized in that, also comprises:
Be used for controlling the gas control unit (S320) of air inlet or exhaust based on the output signal of exporting from Abgassensor (70); With
Gas control stops unit (S340); It is used for equaling or being longer than said scheduled duration (R1) and when the said regeneration period (RP) equals or be shorter than said scheduled time slot (T1) at said response time (CTP), stops said gas control unit (S320) based on air inlet of output SC sigmal control or exhaust from Abgassensor (70) output.
6. reclaimer as claimed in claim 5 (90) is characterized in that,
When said gas control stoped unit (S340) to stop gas control unit (S320) based on output SC sigmal control air inlet of exporting from Abgassensor (70) or exhaust, said gas control unit (S320) was based on the air inlet of output SC sigmal control or the exhaust of exporting from the Air flow meter (12) that is used to detect air inflow.
7. like claim 5 or 6 described reclaimers (90), it is characterized in that,
The amount of said gas control unit (320) control exhaust gas recirculation (EGR), thereby control air inlet or exhaust.
8. gas control system (10) that is used to control air inlet or exhaust, said gas control system (10) comprises like the described reclaimer (90) among the claim 1-3, also comprises:
The Abgassensor (70) of the exhaust gas constituents in the exhaust steam passage (100) of detection internal-combustion engine (2); With
Be used for based on the output SC sigmal control air inlet of exporting or the gas control unit (S320) of exhaust from said Abgassensor (70).
9. gas control system (10) that is used for the air inlet or the exhaust of controlling combustion engine (2), said gas control system (10) comprising:
The Abgassensor (70) of the exhaust gas constituents in the exhaust steam passage (100) of detection internal-combustion engine (2),
Detect the response time (CTP) of said Abgassensor (70) and judge whether said response time (CTP) equals or be longer than the electronic control unit (90) of scheduled duration (R1),
Be used for raising exhaust steam passage (100) waste gas EGT (ET) EGT raised portion (4) and
The flow velocity that is used for improving the flow velocity (FR) of exhaust steam passage (100) waste gas improves part (50), wherein
When said electronic control unit (90) judges that said response time (CTP) equals or when being longer than said scheduled duration (R1); Said electronic control unit (90) control said EGT raised portion (4); EGT (ET) with waste gas in the rising exhaust steam passage (100); Thereby make said Abgassensor (70) regeneration, and
When said electronic control unit (90) judges that said response time (CTP) equals or when being longer than said scheduled duration (R1); The said flow velocity of said electronic control unit (90) control improves part (50); With the waste gas flow velocity (FR) of waste gas in the raising exhaust steam passage (100), thereby make said Abgassensor (70) regeneration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP151670/2008 | 2008-06-10 | ||
| JP2008151670A JP4561879B2 (en) | 2008-06-10 | 2008-06-10 | Exhaust sensor regeneration device and intake / exhaust control system using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101603469A CN101603469A (en) | 2009-12-16 |
| CN101603469B true CN101603469B (en) | 2012-12-26 |
Family
ID=41317910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101390812A Expired - Fee Related CN101603469B (en) | 2008-06-10 | 2009-05-15 | Regeneration device for exhaust gas sensor and gas control system using the regeneration device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4561879B2 (en) |
| CN (1) | CN101603469B (en) |
| DE (1) | DE102009002602B4 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2482012B (en) * | 2010-07-15 | 2017-12-20 | Gm Global Tech Operations Llc | Method to operate a diesel particulate filter |
| US8783015B2 (en) * | 2011-12-15 | 2014-07-22 | Ecomotors, Inc. | Shared EGR system and method for a dual-module engine |
| US20150135679A1 (en) * | 2013-11-21 | 2015-05-21 | General Electric Company | Emissions control in diesel engines |
| JP6380022B2 (en) * | 2014-11-07 | 2018-08-29 | 株式会社デンソー | Sensor control device |
| JP6984356B2 (en) * | 2017-11-29 | 2021-12-17 | 株式会社デンソー | Sensor device |
| JP7209501B2 (en) * | 2018-09-20 | 2023-01-20 | 株式会社Subaru | Exhaust system |
| CN110925109B (en) * | 2019-12-13 | 2022-06-28 | 潍柴动力股份有限公司 | Method and system for controlling fan in vehicle regeneration mode |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005315190A (en) * | 2004-04-30 | 2005-11-10 | Isuzu Motors Ltd | Exhaust gas after-treatment system of diesel engine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0416757A (en) * | 1990-05-10 | 1992-01-21 | Japan Electron Control Syst Co Ltd | Apparatus for diagnosing deterioration of oxygen sensor |
| JP3560263B2 (en) * | 1995-12-20 | 2004-09-02 | 富士重工業株式会社 | Deterioration diagnosis device for oxygen sensor downstream of engine catalyst |
| JP4164640B2 (en) * | 2002-04-16 | 2008-10-15 | 三菱ふそうトラック・バス株式会社 | Exhaust gas purification device for internal combustion engine |
| SE524181C2 (en) * | 2002-11-05 | 2004-07-06 | Volvo Lastvagnar Ab | Method for regenerating a particle filter and vehicles in which such a method is utilized |
| DE102004033958A1 (en) * | 2004-07-14 | 2006-02-09 | Robert Bosch Gmbh | probe |
| DE102004046638A1 (en) * | 2004-09-25 | 2006-03-30 | Robert Bosch Gmbh | Method for operating particle filter in exhaust of internal combustion engine involves blowing secondary air stream into exhaust area upstream of filter in dependence on particle burn-off speed |
| JP4487979B2 (en) * | 2006-06-28 | 2010-06-23 | 株式会社デンソー | Electronic control unit |
| DE102006056100A1 (en) * | 2006-11-28 | 2008-05-29 | Robert Bosch Gmbh | Exhaust gas after-treatment system operating method for use in exhaust duct of internal combustion engine i.e. diesel engine, involves implementing regulation of temperature of exhaust gas before particle filter |
-
2008
- 2008-06-10 JP JP2008151670A patent/JP4561879B2/en not_active Expired - Fee Related
-
2009
- 2009-04-23 DE DE102009002602A patent/DE102009002602B4/en not_active Expired - Fee Related
- 2009-05-15 CN CN2009101390812A patent/CN101603469B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005315190A (en) * | 2004-04-30 | 2005-11-10 | Isuzu Motors Ltd | Exhaust gas after-treatment system of diesel engine |
Non-Patent Citations (3)
| Title |
|---|
| JP特开2006-505738A 2006.02.16 |
| JP特开2008-8174A 2008.01.17 |
| JP特开平9-170966A 1997.06.30 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009299486A (en) | 2009-12-24 |
| DE102009002602A1 (en) | 2009-12-17 |
| DE102009002602B4 (en) | 2012-11-22 |
| JP4561879B2 (en) | 2010-10-13 |
| CN101603469A (en) | 2009-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101603469B (en) | Regeneration device for exhaust gas sensor and gas control system using the regeneration device | |
| CN101896699B (en) | Exhaust gas post-processing device | |
| CN101223347B (en) | Control method of exhaust gas purification system and exhaust gas purification system | |
| CN101223348B (en) | Method of controlling exhaust gas purification system, and exhaust gas purification system | |
| CN101932802B (en) | Internal combustion engine exhaust gas cleaning apparatus and exhaust gas cleaning method | |
| CN100427739C (en) | Exhaust gas cleaning system | |
| US20070144152A1 (en) | Procedure and control unit to operate an integrated SCR/DPF system | |
| CN1930383B (en) | Regeneration controller for exhaust purification apparatus of internal combustion engine | |
| US7631490B2 (en) | System for assisting regeneration of pollution management means | |
| WO2006092946A1 (en) | Exhaust emission control device and internal combustion engine equipped with the exhaust emission control device and particulate filter regenerating method | |
| CN108071511A (en) | For mitigating the method for overtemperature during the particulate filter arrangements of exhaust system regenerate | |
| CN1981915A (en) | Exhaust gas purification device | |
| KR101665134B1 (en) | Exhaust-gas processing device for a diesel engine | |
| CN101208505B (en) | Exhaust gas purification system in internal combustion engine | |
| US20090193791A1 (en) | System for assisting regeneration of pollution management means associated with catalyst forming means | |
| JP2009185659A (en) | Exhaust emission control device for internal combustion engine | |
| JP2011236874A (en) | Emission control device | |
| US7634906B2 (en) | Exhaust gas after-treatment apparatus | |
| JP2006274906A (en) | Exhaust emission control device | |
| WO2013061860A1 (en) | Exhaust gas purification device of internal combustion engine | |
| US20070261389A1 (en) | System for Assisting the Regeneration of Depollution Means for a Motor Vehicle Engine | |
| JP2005307746A (en) | Exhaust emission control device | |
| JP2004285947A (en) | Exhaust emission control device for internal combustion engine | |
| US7765796B2 (en) | System for assisting the regeneration of depollution means for a motor vehicle engine | |
| JP2002332822A (en) | Exhaust emission control device, and exhaust emission control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20190515 |