CN204225965U - DPF automatic regeneration system - Google Patents
DPF automatic regeneration system Download PDFInfo
- Publication number
- CN204225965U CN204225965U CN201320890617.6U CN201320890617U CN204225965U CN 204225965 U CN204225965 U CN 204225965U CN 201320890617 U CN201320890617 U CN 201320890617U CN 204225965 U CN204225965 U CN 204225965U
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- Prior art keywords
- dpf
- diesel engine
- pipe
- heat riser
- thermocouple
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- 238000011069 regeneration method Methods 0.000 title claims abstract description 65
- 230000008929 regeneration Effects 0.000 title claims abstract description 64
- 238000002347 injection Methods 0.000 claims abstract description 32
- 239000007924 injection Substances 0.000 claims abstract description 32
- 238000012958 reprocessing Methods 0.000 claims abstract description 29
- 230000008676 import Effects 0.000 claims abstract description 8
- 239000000523 sample Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000010304 firing Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 5
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 239000000446 fuel Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 125000004122 cyclic group Chemical group 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000000654 additive Substances 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- 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
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The utility model relates to a kind of DPF automatic regeneration system, comprise outlet pipe, DOC, DPF and power circuit, described outlet pipe is made up of air intake-exhaust pipe and outlet pipe of giving vent to anger, be positioned at air intake-exhaust pipe after DOC and DPF is connected in series and give vent to anger between outlet pipe, diesel engine exhaust reprocessing heat riser is built in air intake-exhaust pipe, two probes of differential pressure pickup are separately positioned on DPF inlet end and outlet side and differential pressure pickup signal output part connects the signal input part of ARTECU, thermocouple K1 and thermocouple K2 is separately positioned on DOC and DPF and is connected in series portion and DPF outlet side and thermocouple K1 and thermocouple K2 signal output part connect the signal input part of ARTECU respectively, Injection Pump import takes back oil pipe, Injection Pump exports the transport pipe connect in diesel engine exhaust reprocessing heat riser, the signal output part of Injection Pump SC sigmal control termination ARTECU, air valve import connects air pump, air valve outlet is communicated with the steam line in diesel engine exhaust reprocessing heat riser.
Description
Technical field
The utility model relates to a kind of heating stick at the composite regenerated middle employing diesel engine exhaust reprocessing heat riser of DPF for ignition, and the DPF automatic regeneration system of automatic monitoring, initiatively automatically controlled, fuzzy regeneration can be realized, belong to DPF automatic regeneration system and manufacture field.
Background technique
CN1517526A, title " waste gas cleaning system ", there is the regenerating control device of cyclic regeneration type diesel particulate filter and cyclic regeneration type diesel particulate filter in the exhaust passage of the diesel engine with glow plug, it is characterized in that: described regenerating control device, sprayed by the fuel controlled in countercylinder and carry out delayed injection or secondary injection, and, carry out with the control in glow plug heating cylinder, to regenerate above-mentioned cyclic regeneration type diesel particulate filter.
CN102933803A, title " Exhaust gas purifying device for diesel engine ", described diesel engine is implemented idle stop when meeting predetermined idling-stopping condition and automatically stops described diesel engine, described Exhaust gas purifying device comprises: diesel particulate filter (DPF), and it is arranged in the vent systems of described diesel engine to trap from the particulate matter the exhaust that described diesel engine is discharged; Dpf regeneration portion, when meeting predetermined dpf regeneration condition, described dpf regeneration portion performs dpf regeneration by making the temperature of described DPF raise; Dpf regeneration interrupts restarting portion, and it interrupts described dpf regeneration, performs idle stop, automatically restarts described diesel engine, then restart described dpf regeneration; And idle stop delay portion, when transferring idling operation to during described dpf regeneration, even if when meeting described predetermined idling-stopping condition, described idle stop delay portion also postpones the execution of described idle stop, until the temperature of described DPF when described idle stop starts becomes the temperature of the described DPF be not less than when transferring described idling operation to.
CN1676891A, title " controlling method of waste gas cleaning system ", this waste gas cleaning system, the exhaust passageway being equipped on the internal-combustion engine on vehicle has cyclic regeneration diesel engine particulate filter device and exhaust shutter, and there is diesel particulate filter control mechanism, this diesel particulate filter control mechanism has: the recovery time decision mechanism judging the regeneration elapsed time of described cyclic regeneration diesel engine particulate filter device, rise and the regeneration sector that the shot-like particle forced burning of trapping is regenerated to make described cyclic regeneration diesel engine particulate filter device with making delivery temperature, it is characterized in that, by described regeneration sector, when carrying out the Regeneration control of described cyclic regeneration diesel engine particulate filter device, when detecting the halted state of vehicle, interrupt this Regeneration control, carry out multi-stage jet control, and close described exhaust shutter.
Model utility content
Purpose of design: design a kind of heating stick at the composite regenerated middle employing diesel engine exhaust reprocessing heat riser of DPF for ignition, and DPF automatic regeneration system and the regeneration method that can realize automatic monitoring, initiatively automatically controlled, fuzzy regeneration.
Design proposal: in order to realize above-mentioned purpose of design.The application is in system, one be with the applicant at the diesel engine exhaust reprocessing heat riser (abbreviation heat riser) of first patent application for foundation stone, and get oil according to diesel engine exhaust reprocessing heat riser from return line and be supplied to heat riser, gasoline lighted by heating stick in heat riser, provides burning required air to unite by independent air pump; Two is judge scheme, based on regeneration Fuzzy temperature control strategy and the regeneration ending determination methods of closed loop control based on the regeneration opportunity of DPF pressure reduction model.
Adopt the pressure difference at ART ECU Real-time Collection DPF two ends, when pressure reaches regeneration setting value, ART ECU controls heating stick heating, and air valve is opened, Injection Pump work, implements regeneration.ARTECU detects the temperature of thermoelectric couple K1, and controls the fuel injection quantity of Injection Pump, allows temperature combustion in setting value.ART detects thermoelectric couple K2, when the temperature of K2 reaches setting value, represents that regeneration completes, and exits regeneration (stopping the work of heating stick, Injection Pump, air valve).
Technological scheme: a kind of DPF automatic regeneration system, comprise outlet pipe, DOC, DPF and power circuit, described outlet pipe is made up of air intake-exhaust pipe and outlet pipe of giving vent to anger, be positioned at air intake-exhaust pipe after DOC and DPF is connected in series and give vent to anger between outlet pipe, diesel engine exhaust reprocessing heat riser is built in air intake-exhaust pipe, two probes of differential pressure pickup are separately positioned on DPF inlet end and outlet side and differential pressure pickup signal output part connects the signal input part of ART ECU, thermocouple K1 and thermocouple K2 is separately positioned on DOC and DPF and is connected in series portion and DPF outlet side and thermocouple K1 and thermocouple K2 signal output part connect the signal input part of ART ECU respectively, Injection Pump import takes back oil pipe, Injection Pump exports the transport pipe connect in diesel engine exhaust reprocessing heat riser, the signal output part of Injection Pump SC sigmal control termination ART ECU, air valve import connects air pump, air valve outlet is communicated with the steam line in diesel engine exhaust reprocessing heat riser, the signal output part of air valve SC sigmal control termination ART ECU, the signal output part of diesel engine exhaust reprocessing heat riser heating stick SC sigmal control termination ART ECU.
The utility model is compared with background technique, one is the application with the applicant at the diesel engine exhaust reprocessing heat riser of first patent application for foundation stone, the application is adopted automatically to monitor, initiatively automatically controlled, fuzzy regeneration DPF automatic regeneration system and method, not only break through the low temperature restriction of ambient temperature and vehicle exhaust temperature, not influenced by ambient temperature, when ambient temperature >=-30 DEG C, igniting regeneration can not only be realized, and can not secondary pollution be produced during firing up, meet emission standard at different levels, first warm-up fuel in igniting process, after forming oil gas, ignite on part by nozzle with vaporific being directly sprayed onto, and then light, on with the interference of car electronic device and impact when not only avoid igniting regeneration, and achieve diesel engine particulate filter ramp regeneration under low exhaust temperature.
accompanying drawing explanation
Fig. 1 is the schematic diagram of DPF automatic regeneration system, and wherein, ART ECU refers to control panel pick-up transducers value, and regeneration condition judges, control regeneration etc.; DOC refers to oxidizing catalytic converter; DPF refers to PM particulate filter; Thermoelectric couple K1 K2 refer to temperature transducer; Differential pressure pickup refers to the pressure difference detecting DPF two ends; Ad1 ad2 ad3 refers to that sensor gathers cable; Control 1 control 2 control 3 refer to OCL output control line cable; Air valve refers to and controls to be input to firing chamber from the air air pump; Injection Pump refers to and controls from return tube, take out diesel oil and spray in firing chamber.
Fig. 2 is the schematic diagram of temperature, pressure, oil level signal Acquisition Circuit.
Fig. 3 is the schematic diagram of temperature, pressure, oil level AD conversion circuit.
Fig. 4 is the schematic diagram of Injection Pump, additive pump signal output apparatus.
Fig. 5 is the schematic diagram of delivery air pump, heating stick, oil circuit solenoid valve control circuit.
Fig. 6 is the schematic diagram of power circuit.
Fig. 7 is the general assembly circuit diagram of Fig. 2-Fig. 6.
Embodiment
Embodiment 1: with reference to accompanying drawing 1-7.A kind of DPF automatic regeneration system, comprise outlet pipe 1, DOC3, DPF4 and power circuit, described outlet pipe is made up of air intake-exhaust pipe 101 and outlet pipe 102 of giving vent to anger, be positioned at air intake-exhaust pipe 101 after DOC3 and DPF4 is connected in series and give vent to anger between outlet pipe 102, diesel engine exhaust reprocessing heat riser 2 is built in air intake-exhaust pipe 101, two probes of differential pressure pickup 5 are separately positioned on DPF4 inlet end and outlet side and differential pressure pickup 5 signal output part connects the signal input part of ART ECU6 by ad2, thermocouple K1 and thermocouple K2 is separately positioned on DOC3 and DPF4 and is connected in series portion and DPF4 outlet side and thermocouple K1 and thermocouple K2 signal output part connect the signal input part of ART ECU6 respectively by ad3 and ad1, Injection Pump 7 import takes back oil pipe, Injection Pump 7 exports the transport pipe connect in diesel engine exhaust reprocessing heat riser 2, Injection Pump 7 SC sigmal control end connects the signal output part of ART ECU6 by Contro3, air valve 8 import connects air pump, air valve 8 outlet is communicated with the steam line in diesel engine exhaust reprocessing heat riser 2, air valve 8 SC sigmal control end connects the signal output part of ART ECU6 by Contro2, the signal output part of diesel engine exhaust reprocessing heat riser 2 heating stick 201 SC sigmal control termination ART ECU6.Described air valve 8 controls the firing chamber 202 being input to diesel engine exhaust reprocessing heat riser 2 from the air air pump.Described Injection Pump 7 controls to take out diesel oil from return tube and sprays into the firing chamber in diesel engine exhaust reprocessing heat riser 2.
1, power circuit mentality of designing: automobile electrically-controlled ECU working environment is complicated, climatic environment, work condition environment, elecromagnetic environment.Must take into full account that the adaptability of the single components and parts of circuit all reaches the application of complex environment when designing, the operating temperature of all devices is selected all in the operating range of 40 degrees below zero to more than 85 degree.The change of work condition environment and elecromagnetic environment brings circuit noise, the most easily affect be power supply, signals collecting, output control stability, take into full account the impact of each factor during design, by following circuit design ensure design performance reach designing requirement.
Power circuit: the comprehensive use adopting DC-DC and LDO.When each operating mode works, power supply fluctuation scope is large, electromagnetic interference serious due to automobile for DC-DC, so select the LMZ14203 chip that wide input voltage range can normally work between 7V to 42V, electromagnetism interference is strong.
LDO linear stabilized power supply MIC39100-3.3, in circuit design, increase LDO is fluctuation (ripple interference) for reducing power supply further, gather analogue signal (pressure, temperature) more accurately, allow judgement become more reliable and more stable, reduce unnecessary erroneous judgement.
Temperature acquisition: K type thermoelectric couple, amplifier and environment temperature sensor can be adopted, carry out voltage acquisition, environment temperature sensor collection CPU carries out software compensation again, the method is the application of a lot of low side cheapness, select ADI 8497 process chip of specialty, be integrated with temperature-compensation circuit, environment temperature sensor that need not be extra and software algorithm thereof, circuit is simple and reliable, also simplify Software for Design.
AD sample circuit: ADI 7794 circuit has the acquisition capacity of 6 passages, carries filter function, and reference power supply has the highi degree of accuracy of 24, and single-chip solves multiple collection value, and hardware design is simple and reliable.
Oil pump controlling circuit: adopt isolation control signal to export and control as this chip of ISO7242 has isolation characteristic highly, prevent in control oil pump high voltage, during big current, undesired signal is introduced and gather and CPU processing circuit, BTS442E2 exports for controlling, this chip is the highest can control maximum voltage 42V electric current 21A, and the load of voltage and current is much larger than oil pump requirement.More than design sufficient Redundancy Design, ensure the stability (the controlling the stable of fuel delivery of brief introduction) of fuel feeding frequency.
Air pump and heat pump control circuit: adopt light-coupled isolation TLP281-4 control IR7240, TLP281-4, IR7240 are withstand voltage much larger than 24V requirement, this control signal is without the need to switching controls (control frequency is low) fast.
Two additives: the CPU moment detects fuel level sensor signal, when oil level signal have significantly change time, according to oil level signal change amplitude, spray into additive to fuel tank by a certain percentage, utilize CPU control additive pump realize.
The method of its DPF automatic regeneration system automatic regeneration: the pressure difference at ART ECU6 Real-time Collection DPF4 two ends, when pressure reaches regeneration setting value, ART ECU6 controls the heating stick heating in diesel engine exhaust reprocessing heat riser 2, control air valve 8 is opened to the steam line air feed in diesel engine exhaust reprocessing heat riser 2, control Injection Pump 7 to the quantitative fuel feeding of transport pipe in diesel engine exhaust reprocessing heat riser 2, implement regeneration, ART ECU6 detects the temperature of thermoelectric couple K1, and control the fuel injection quantity of Injection Pump, allow temperature combustion in setting value, ART ECU6 detects thermoelectric couple K2, when the temperature of thermoelectric couple K2 reaches setting value, represent that regeneration completes, exit regeneration, stop diesel engine exhaust reprocessing heat riser 2 heating stick, Injection Pump, the work of air valve.
Enter regeneration to judge: the pressure difference value being gathered monitoring DPF 4 air inlet of differential pressure pickup moment and air outlet by embedded type CPU in ART ECU6 determines whether that needs enter regeneration, when the PM content in DPF4 is in rated range, the pressure difference at DPF4 two ends is in a basic balance; Continuing to rise when exceeding DPF4 nominal level pressure difference signal, utilizing nominal level to determine whether to enter automatic regeneration with the pressure reduction exceeding nominal level two kinds different; Regenerative process: in ART ECU6, CPU controls heating stick working circuit, open heating stick and carry out preheating, arrive when preheat time, open air valve 8, then the oil circuit solenoid valve of Injection Pump 7 is opened, CPU controls oil spout circuit and carries out little HZ oil spout, under the double action of heating stick 201 and exhaust temperature, delivery temperature rises, and reach the firing point lighting diesel oil, temperature rises rapidly, simultaneously the CPU moment detects the temperature before DPF, enter Fuzzy Predictive Control fuel injection quantity, when temperature does not reach PM regeneration temperature, improve fuel injection quantity; When temperature exceed or close to time reduce fuel injection quantity, allow regeneration temperature reach and control in rational setting range.Regeneration ending: gather ART ECU(6 by embedded type CPU) detect thermoelectric couple K2, when the temperature of thermoelectric couple K2 reaches setting value, represent that regeneration completes, exit regeneration, stop the work of diesel engine exhaust reprocessing heat riser (2) heating stick, Injection Pump, air valve, CPU controls regeneration ending.Regeneration ending closes Injection Pump, then closes heating stick, finally closes air pump.
The CPU moment in ART ECU6 detects fuel level sensor signal, when oil level signal have significantly change time, according to the amplitude that oil level signal changes, spray into additive to fuel tank by a certain percentage, utilize CPU whether to control additive pump work.
It is to be understood that: although above-described embodiment to be contrasted detailed text description to mentality of designing of the present utility model; but these text descriptions; just the simple text of the utility model mentality of designing is described; instead of the restriction to the utility model mentality of designing; any do not exceed the utility model mentality of designing combination, increase or amendment, all fall in protection domain of the present utility model.
Claims (3)
1. a DPF automatic regeneration system, comprise outlet pipe (1), DOC(3), and power circuit DPF(4), it is characterized in that: described outlet pipe is made up of air intake-exhaust pipe (101) and outlet pipe of giving vent to anger (102), and be positioned between air intake-exhaust pipe (101) and outlet pipe of giving vent to anger (102) after DPF(4) being connected in series DOC(3), diesel engine exhaust reprocessing heat riser (2) is built in air intake-exhaust pipe (101), two probes of differential pressure pickup (5) are separately positioned on DPF(4) inlet end and outlet side and differential pressure pickup (5) signal output part meets ART ECU(6) signal input part, thermocouple K1 and thermocouple K2 is separately positioned on DOC(3) and DPF(4) be connected in series portion and DPF(4) outlet side and thermocouple K1 and thermocouple K2 signal output part meet ART ECU(6 respectively) signal input part, Injection Pump (7) import takes back oil pipe, Injection Pump (7) exports the transport pipe connect in diesel engine exhaust reprocessing heat riser (2), Injection Pump (7) SC sigmal control termination ART ECU(6) signal output part, air valve (8) import connects air pump, air valve (8) outlet is communicated with the steam line in diesel engine exhaust reprocessing heat riser (2), air valve (8) SC sigmal control termination ART ECU(6) signal output part, diesel engine exhaust reprocessing heat riser (2) heating stick SC sigmal control termination ART ECU(6) signal output part.
2. DPF automatic regeneration system according to claim 1, is characterized in that: described air valve (8) controls the firing chamber being input to diesel engine exhaust reprocessing heat riser (2) from the air air pump.
3. DPF automatic regeneration system according to claim 1, is characterized in that: described Injection Pump (7) controls from return tube, take out diesel oil and spray into the firing chamber in diesel engine exhaust reprocessing heat riser (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320890617.6U CN204225965U (en) | 2013-12-30 | 2013-12-30 | DPF automatic regeneration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320890617.6U CN204225965U (en) | 2013-12-30 | 2013-12-30 | DPF automatic regeneration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204225965U true CN204225965U (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320890617.6U Expired - Fee Related CN204225965U (en) | 2013-12-30 | 2013-12-30 | DPF automatic regeneration system |
Country Status (1)
| Country | Link |
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| CN (1) | CN204225965U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758614A (en) * | 2013-12-30 | 2014-04-30 | 黄黎敏 | Automatic regeneration system and regeneration method of DPF (Diesel Particulate Filter) |
| CN104863762A (en) * | 2015-05-05 | 2015-08-26 | 潍柴动力股份有限公司 | Temperature control method and device and engine air inlet control system |
| CN111042897A (en) * | 2019-11-07 | 2020-04-21 | 一汽解放汽车有限公司 | DPF regeneration system and application method thereof |
-
2013
- 2013-12-30 CN CN201320890617.6U patent/CN204225965U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758614A (en) * | 2013-12-30 | 2014-04-30 | 黄黎敏 | Automatic regeneration system and regeneration method of DPF (Diesel Particulate Filter) |
| CN104863762A (en) * | 2015-05-05 | 2015-08-26 | 潍柴动力股份有限公司 | Temperature control method and device and engine air inlet control system |
| CN111042897A (en) * | 2019-11-07 | 2020-04-21 | 一汽解放汽车有限公司 | DPF regeneration system and application method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151016 Address after: 556011 first industrial zone, Kaili Economic Development Zone, Qiandongnan Miao and Dong Autonomous Prefecture, Guizhou Patentee after: GUIZHOU HUANGDI DIESEL ENGINE CLEANER Co.,Ltd. Address before: Yuhang street Nanyuan District Henan Dai Road Hangzhou city Zhejiang province 311100 No. 46 five floor Patentee before: Huang Limin Patentee before: Huang Lijin |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 556011 the first industrial park of Kaili Economic Development Zone, Qiandongnan Miao and Dong Autonomous Prefecture, Guizhou Patentee after: GUIZHOU HUANGDI DIESEL ENGINE CLEANER CO.,LTD. Address before: 556011 the first industrial park of Kaili Economic Development Zone, Qiandongnan Miao and Dong Autonomous Prefecture, Guizhou Patentee before: GUIZHOU HUANGDI DIESEL ENGINE CLEANER Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 |
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| CF01 | Termination of patent right due to non-payment of annual fee |