CN100535417C - Electronic controller of electron controlled exhaust gas recirculation system in diesel engine - Google Patents
Electronic controller of electron controlled exhaust gas recirculation system in diesel engine Download PDFInfo
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- CN100535417C CN100535417C CNB200710029056XA CN200710029056A CN100535417C CN 100535417 C CN100535417 C CN 100535417C CN B200710029056X A CNB200710029056X A CN B200710029056XA CN 200710029056 A CN200710029056 A CN 200710029056A CN 100535417 C CN100535417 C CN 100535417C
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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
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Abstract
This invention discloses an electronic controller of a re-circulation system of waste gas of a diesel engine including a signal receiving module, a control unit module, a display module, a fault resuming module, an analog simulation module, a supply stabilizing module and a drive module of an executing unit to be integrated on an I/O interface board, which can control volume of waste gas flowing into the air intake from the vent of an engine automatically and reduce NOx ventilation effectively under various working states to realize simulation match calibration of EGR valve and the engine to simulate control process of EGR valve.
Description
Technical field
The invention belongs to electrical control system for engine, be specifically related to a kind of electronic controller of electron controlled exhaust gas recirculation system in diesel engine.
Background technique
Automobile gas emission pollution is quite serious in the centre area of some central cities of China, and especially the emission pollution problem of NOx is outstanding, and social production and people's lives have been brought bad influence.In recent years along with being on the increase of diesel-oil vehicle use amount, the demand that requires to reduce diesel-oil vehicle NOx and carbon smoke exhaust is more and more urgent.
Though a large amount of research work are being done aspect the NOx discharging of control diesel-oil vehicle by automobile vendor and research institution, and the various control measure has been proposed, as postponing fuel supply advance angle, use multi-injection, adopt high-pressure common-rail injection system, using reduction catalysts purification technics etc.But because these control techniques are when reducing the NOx discharging, or as the retarded injection advance angle engine thermal efficiency is reduced, fuel economy descends, fuel consumption rate and soot increase; Improved manufacture cost greatly; Make engine structure become complicated, do not take into account the performance of each side, so its effect is restricted.Studies show that both at home and abroad EGR Technology increases under the less situation at cost, is the effective measures that reduce the NOx discharging significantly.The present invention be do not transform engine structure, as far as possible reduce cost, do not reduce engine power, do not increase under the prerequisite of fuel consumption rate, the discharge amount of motor NOx can be controlled and reduce to the diesel electric-controlled EGR control technique and the device of exploitation effectively.
Summary of the invention
The object of the present invention is to provide a kind of electronic controller of electron controlled exhaust gas recirculation system in diesel engine.
The present invention is a kind of electronic Control for Diesel Engine exhaust gas recirculation (Exhaust Gas Recirculation is called for short EGR) system electronic controller (Electronic Control Unit is called for short ECU).
Electronic controller of electron controlled exhaust gas recirculation system in diesel engine of the present invention includes signal receiving module 1, control unit module 2, display modular 3, fault recovery module 4, analog simulation module 5, power regulator module 6, actuator's driver module 7.Wherein signal receiving module 1 is connected with the input end of control unit module 2, and the output terminal of control unit module 2 is connected with the input end of actuator driver module 7, and the output terminal of analog simulation module 5 is connected with control unit module 2 by signal receiving module 1.Signal receiving module 1 is gathered engine rotational speed signal, throttle position signal and water temperature signal, and these data are sent to control unit module 2.Control unit module 2 sends to control signal the input end of actuator's driver module 7, and tach signal is sent to the input end of display modular 3 with throttle position signal, fault recovery module 4 is connected with control unit module 2, and power regulator module 6 is connected power supply respectively with signal receiving module 1, control unit module 2, display modular 3, fault recovery module 4, analog simulation module 5 and actuator's driver module 7.
Above-mentioned signal receiving module 1, control unit module 2, display modular 3, fault recovery module 4, analog simulation module 5, power regulator module 6 and actuator's driver module 7 all are integrated on the block I/O interface board.
Above-mentioned signal receiving module 1 includes A/D analog-digital converter U2; frequency divider U3; current-limiting resistance R6; current-limiting resistance R7; polar capacitor C2; DSP digital signal processor U5; current-limiting resistance R5; protective resistance R4 and protection diode D6; throttle position signal is connected with A/D analog-digital converter U2 with polar capacitor C2 by current-limiting resistance R7; water temperature signal is connected with A/D analog-digital converter U2 by current-limiting resistance R6; tach signal is by current-limiting resistance R5; protective resistance R4 is connected with DSP digital signal processor U5 with protection diode D6; the signal output part of A/D analog-digital converter U2 is connected with the control unit module 2 of diesel electric-controlled egr system electronic controller; one of them output terminal of DSP digital signal processor U5 is connected with the control unit module 2 of diesel electric-controlled egr system controller; the output terminal of frequency divider U3 is connected with A/D analog-digital converter U2, and the input end of frequency divider U3 is connected with the control unit module 2 of diesel electric-controlled egr system electronic controller.
Above-mentioned control unit module 2 includes CPU control chip, I/O interface circuit, the CPU control chip is 51 series monolithic U1, the I/O interface circuit is address latch U4, the input end of address latch U4 is connected with control chip U1, the output terminal of address latch U4 is connected with the address end of A/D analog-digital converter U2, be responsible for the address of CPU control chip U1 is exported with control A/D analog-digital converter U2, realize calling of data and address.
Above-mentioned actuator driver module 7 includes photo coupler U9, current-limiting resistance R3, current-limiting resistance R2, diode D3 and D4, polar capacitor C1, power amplifier U10, the signal input part of photo coupler U9 is connected with the control unit module 2 of diesel electric-controlled egr system electronic controller, the power input of photo coupler U9 is connected with the 5V power supply by current-limiting resistance R3, output terminal one end of photo coupler U9 is connected with the 12V power supply with diode D3 by current-limiting resistance R2, the output terminal the other end of photo coupler U9 is connected with the input end of power amplifier U10, the positive pole of polar capacitor C1 is connected with the output terminal of power amplifier U10 by diode D4, and the control signal of control unit module 2 is delivered to the input end of vacuum solenoid by the output terminal of power amplifier U10.
Above-mentioned display modular 3 includes light-emitting diode display DS1, DS2, DS3, DS4, DS5 and DS6, drive triode Q1, Q2, Q3, Q4, Q5 and Q6, decoder U8, sift register U7, current-limiting resistance R8～R21, the input end of decoder U8 is connected with the electronic control unit module 2 of diesel electric-controlled egr system electronic controller, the output terminal of decoder U8 joins by current-limiting resistance R17～R21 and above-mentioned driving triode, each is connected each triode with a light-emitting diode display drive end with a current-limiting resistance, the input end of sift register U7 is connected with the serial port of the control unit module 2 of electric control EGR system controller, and the output terminal of sift register U7 joins by the numerical digit control end of current-limiting resistance R8～R16 and above-mentioned light-emitting diode display.
Above-mentioned fault recovery module 4 includes fault recovery button S1, polar capacitor C5, capacitor C 6, current-limiting resistance R1 and diode D5, one end of the end of fault recovery button S1, the positive pole of polar capacitor C5, capacitor C 6 is connected with the output terminal of power regulator module 6, the other end of fault recovery button S1 links to each other with the negative pole of diode D5, and the other end that passes through capacitor C 6 links to each other with " RESET " pin of control chip U1, the negative pole of polar capacitor C5 links to each other with current-limiting resistance R1, and the other end of current-limiting resistance R1 links to each other with ground with the positive pole of diode D5.
Above-mentioned analog simulation module 5 includes rheostat R22 and R23, and the end of rheostat R22 and R23 is connected with the input end of A/D analog-digital converter U2, and the other end links to each other with power regulator module 6.
Above-mentioned power regulator module 6 includes diode D1 and D2, voltage stabilizing chip U6, the positive pole of diode D1 is connected with power supply, negative pole links to each other with the positive pole of diode D2, the negative pole of diode D2 links to each other with the input end of voltage stabilizing chip U6, power regulator module 6 can connect the 12V stabilized power supply, also can adopt automobile 24V storage battery.
Electronic Control for Diesel Engine gas recirculation system of the present invention (Exhaust Gas Recirculation is called for short EGR) adopts the structure that comprises sensor, electronic controller, final controlling element three parts.Wherein sensor comprises rotating speed, throttle position and water temperature three sensors, receives rotating speed, throttle position and water temperature three signals of motor by sensor.Electronic controller is made into a block I/O interface board, is to be core with the single-chip microcomputer, and collection data capture, signal generation and data transmission and be shown as the system of one comprises signal receiving module, control unit module, display modular and actuator's driver module etc.Final controlling element is a vacuum solenoid, is used for controlling the switching of EGR valve.Power supply of the present invention can adopt direct current 12V stabilized power supply, also can adopt automobile 24V storage battery as power supply.
The invention has the beneficial effects as follows provides the exhaust gas recirculation control technique and the device that can effectively reduce motor NOx, can carry out simulated calibration to the EGR valve of design and the coupling of motor, can carry out emulation to the control procedure of EGR valve.The present invention can be used as the means that motor reduces the NOx discharging, also can be used as the assistant tool of engine electric control EGR system electronic controller exploitation.
Description of drawings
Fig. 1 is the schematic diagram of diesel electric-controlled egr system electronic controller of the present invention.
Fig. 2 is the circuit diagram of display modular 3 of the present invention.
Fig. 3 is the circuit diagram of actuator of the present invention driver module 7.
Fig. 4 is the circuit diagram of signal receiving module 1 of the present invention.
Fig. 5 is tach signal processing circuit figure of the present invention.
Fig. 6 is that signal receiving module 1 of the present invention, electronic control unit module 2, display modular 3, fault recovery module 4, analog simulation module 5, power regulator module 6 and actuator's driver module 7 all are integrated in the circuit diagram on the block I/O interface board.
Embodiment
Embodiment:
Structural representation of the present invention includes signal receiving module 1, control unit module 2, display modular 3, fault recovery module 4, analog simulation module 5, power regulator module 6, actuator's driver module 7 as shown in Figure 1.Wherein signal receiving module 1 is connected with the input end of control unit module 2, and the output terminal of control unit module 2 is connected with the input end of actuator driver module 7, and the output terminal of analog simulation module 5 is connected with control unit module 2 by signal receiving module 1.Signal receiving module 1 is gathered engine rotational speed signal, throttle position signal and water temperature signal, and these data are sent to control unit module 2.Control unit module 2 sends to control signal the input end of actuator's driver module 7, and tach signal is sent to the input end of display modular 3 with throttle position signal, fault recovery module 4 is connected with control unit module 2, and power regulator module 6 is connected power supply respectively with signal receiving module 1, control unit module 2, display modular 3, fault recovery module 4, analog simulation module 5 and actuator's driver module 7.
Above-mentioned signal receiving module 1, control unit module 2, display modular 3, fault recovery module 4, analog simulation module 5, power regulator module 6 and actuator's driver module 7 all are integrated on the block I/O interface board.
Above-mentioned signal receiving module 1 includes A/D analog-digital converter U2, frequency divider U3, current-limiting resistance R6, current-limiting resistance R7, polar capacitor C2, DSP digital signal processor U5, current-limiting resistance R5, protective resistance R4 and protection diode D6.Throttle position signal is connected with A/D analog-digital converter U2 with capacitor C 2 by current-limiting resistance R7; water temperature signal is connected with A/D analog-digital converter U2 by current-limiting resistance R6; tach signal is by current-limiting resistance R5; protective resistance R4 is connected with DSP digital signal processor U5 with protection diode D6; the signal output part of A/D analog-digital converter U2 is connected with the control unit module 2 of diesel electric-controlled egr system electronic controller; one of them output terminal of DSP digital signal processor U5 is connected with the control unit module 2 of diesel electric-controlled egr system controller; the output terminal of frequency divider U3 is connected with A/D analog-digital converter U2, and the input end of frequency divider U3 is connected with the control unit module 2 of diesel electric-controlled egr system electronic controller.
In the present embodiment, when sensor signal is input to A/D analog-digital converter U2, analogue signal by control unit module 2 need be changed by address latch U4 gating sends back to control unit module 2 to the digital signal that is converted to again, has just realized each real-time signal acquisition of sensor.
Above-mentioned control unit module 2 includes CPU control chip, I/O interface circuit, and the CPU control chip is 51 series monolithic U1, and the I/O interface circuit is address latch U4.The input end of address latch U4 is connected with control chip U1, and the output terminal of address latch U4 is connected with the address end of A/D analog-digital converter U2.Wherein, store the work information of motor among the control chip U1, after receiving the signal that A/D analog-digital converter U2 and DSP digital signal processor U5 transmit, judge the residing operating mode of motor this moment, calculate the needed control impuls of vacuum solenoid this moment, U1 sends control signal by control chip, realizes the automatic control of EGR valve.
Above-mentioned actuator driver module 7 includes photo coupler U9, current-limiting resistance R3, current-limiting resistance R2, diode D3 and D4, polar capacitor C1, power amplifier U10, the signal input part of photo coupler U9 is connected with the control unit module 2 of diesel electric-controlled egr system electronic controller, the power input of photo coupler U9 is connected with the 5V power supply by current-limiting resistance R3, output terminal one end of photo coupler U9 is connected with the 12V power supply with diode D3 by current-limiting resistance R2, the output terminal the other end of photo coupler U9 is connected with the input end of power amplifier U10, the positive pole of polar capacitor C1 is connected with the output terminal of power amplifier U10 by diode D4, and the control signal of control unit module 2 is delivered to the input end of vacuum solenoid by the output terminal of power amplifier U10.In the present embodiment, after the control signal that power amplifier U10 sends control chip U1 is amplified, be input in the vacuum solenoid aperture of control vacuum solenoid, and then the aperture of control EGR valve.
Above-mentioned fault recovery module 4 includes fault recovery button S1, polar capacitor C5, capacitor C 6, current-limiting resistance R1 and diode D5.One end of the end of fault recovery button S1, the positive pole of polar capacitor C5, capacitor C 6 is connected with the output terminal of power regulator module 6, the other end of fault recovery button S1 links to each other with the negative pole of diode D5, and the other end that passes through capacitor C 6 links to each other with " RESET " pin of control chip U1, the negative pole of polar capacitor C5 links to each other with current-limiting resistance R1, and the other end of current-limiting resistance R1 links to each other with ground with the positive pole of diode D5.In the present embodiment, when control system is absorbed in endless loop, press fault recovery button S1 after, fault recovery module 4 will continue two low levels more than the cycle on control chip U1 " RESET " pin, control chip U1 is resetted, thereby make control system rework.
Above-mentioned power regulator module 6 includes diode D1 and D2, voltage stabilizing chip U6.The positive pole of diode D1 is connected with power supply, and negative pole links to each other with the positive pole of diode D2, and the negative pole of diode D2 links to each other with the input end of voltage stabilizing chip U6.In the present embodiment, voltage stabilizing chip U6 output terminal provides the voltage of 5V to control system.
Above-mentioned analog simulation module 5 includes rheostat R22 and R23.The end of rheostat R22 and R23 is connected with the input end of A/D analog-digital converter U2, and the other end links to each other with power regulator module 6.In the present embodiment, when the resistance value of standardsizing rheostat R22 and R23, produce variable voltage at its output terminal, thereby can simulate the variation of throttle position and engine dynamometer change in rotational speed when loading, realize to the simulated calibration of EGR valve and Engine Matching with to the emulation of EGR valve control procedure.
The present invention is used for:
Store the analog simulation data of EGR valve and Engine Matching among the control chip U1 of electronic control unit module 2.When standardsizing rheostat R22, produce a variable voltage, the signal similar that this voltage signal and engine oil door position sensor transmit; During standardsizing rheostat R23, produce a variable voltage again again, the load signal when this loads to engine dynamometer is similar.Make rule that these two signals change and engine speed, load signal Changing Pattern identical on control logic, then this two voltage signal just is converted into engine condition signal.Control unit module 2 is judged motor operating modes of living in according to two analogue signals at this moment, calculates needed control impuls this moment, realizes simulating and controls.
Claims (9)
1, a kind of electronic controller of electron controlled exhaust gas recirculation system in diesel engine is characterized in that including signal receiving module (1), control unit module (2), display modular (3), fault recovery module (4), analog simulation module (5), power regulator module (6), actuator's driver module (7); Wherein signal receiving module (1) is connected with the input end of control unit module (2), the output terminal of control unit module (2) is connected with the input end of actuator's driver module (7), the output terminal of analog simulation module (5) is connected with control unit module (2) by signal receiving module (1), signal receiving module (1) is gathered engine rotational speed signal, throttle position signal and water temperature signal, and the signal data of gathering sent to control unit module (2), control unit module (2) sends to control signal the input end of actuator's driver module (7), and tach signal is sent to the input end of display modular (3) with throttle position signal, fault recovery module (4) is connected with control unit module (2), power regulator module (6) and signal receiving module (1), control unit module (2), display modular (3), fault recovery module (4), analog simulation module (5) and actuator's driver module (7) connect respectively.
2, electronic controller according to claim 1 is characterized in that above-mentioned signal receiving module (1), control unit module (2), display modular (3), fault recovery module (4), analog simulation module (5), power regulator module (6) and actuator's driver module (7) all are integrated on the block I/O interface board.
3; electronic controller according to claim 1; it is characterized in that above-mentioned signal receiving module (1) includes A/D analog-digital converter U2; frequency divider U3; current-limiting resistance R6; current-limiting resistance R7; polar capacitor C2; DSP digital signal processor U5; current-limiting resistance R5; protective resistance R4 and protection diode D6; water temperature signal is connected with A/D analog-digital converter U2 with polar capacitor C2 by current-limiting resistance R7; throttle position signal is connected with A/D analog-digital converter U2 by current-limiting resistance R6; tach signal is by current-limiting resistance R5; protective resistance R4 is connected with DSP digital signal processor U5 with protection diode D6; the signal output part of A/D analog-digital converter U2 is connected with control unit module (2); one of them output terminal of DSP digital signal processor U5 is connected with control unit module (2); the output terminal of frequency divider U3 is connected with A/D analog-digital converter U2, and the input end of frequency divider U3 is connected with control unit module (2).
4, electronic controller according to claim 1, it is characterized in that above-mentioned control unit module (2) includes CPU control chip, I/O interface circuit, the CPU control chip is 51 series monolithic U1, the I/O interface circuit is address latch U4, the input end of address latch U4 is connected with control chip U1, the output terminal of address latch U4 is connected with the address end of the A/D analog-digital converter U2 of signal receiving module, the output of the address of CPU control chip U1 with control A/D analog-digital converter U2, is realized calling of data and address.
5, electronic controller according to claim 1 is characterized in that above-mentioned actuator driver module (7) includes photo coupler U9, current-limiting resistance R3, current-limiting resistance R2, diode D3 and D4, polar capacitor C1, power amplifier U10; The signal input part of photo coupler U9 is connected with control unit module (2), the power input of photo coupler U9 is connected with the 5V power supply by current-limiting resistance R3, output terminal one end of photo coupler U9 is connected with the 12V power supply with diode D3 by current-limiting resistance R2, the output terminal the other end of photo coupler U9 is connected with the input end of power amplifier U10, the positive pole of polar capacitor C1 is connected with the output terminal of power amplifier U10 by diode D4, and the control signal of control unit module (2) is delivered to the input end of vacuum solenoid by the output terminal of power amplifier U10.
6, electronic controller according to claim 1, it is characterized in that above-mentioned display modular (3) includes light-emitting diode display DS1, DS2, DS3, DS4, DS5 and DS6, drive triode Q1, Q2, Q3, Q4, Q5 and Q6, decoder U8, sift register U7, current-limiting resistance R8～R21, the input end of decoder U8 is connected with control unit module (2), the output terminal of decoder U8 joins by current-limiting resistance R16～R21 and above-mentioned driving triode, each triode each with R16～R21 in a current-limiting resistance be connected with a light-emitting diode display drive end, the input end of sift register U7 is connected with the serial port of control unit module (2), and the output terminal of sift register U7 joins by the numerical digit control end of current-limiting resistance R8～R15 and above-mentioned light-emitting diode display.
7, electronic controller according to claim 1 is characterized in that above-mentioned fault recovery module (4) includes fault recovery button S1, polar capacitor C5, capacitor C 6, current-limiting resistance R1 and diode D5; One end of the end of fault recovery button S1, the positive pole of polar capacitor C5, capacitor C 6 is connected with the output terminal of power regulator module (6), the other end of fault recovery button S1 links to each other with the negative pole of diode D5, and the other end that passes through capacitor C 6 links to each other with " RESET " pin of the control chip U1 of control unit module, the negative pole of polar capacitor C5 links to each other with current-limiting resistance R1, and the other end of current-limiting resistance R1 links to each other with ground with the positive pole of diode D5.
8, electronic controller according to claim 1, it is characterized in that above-mentioned analog simulation module (5) includes rheostat R22 and R23, the end of rheostat R22 and R23 is connected with the input end of the A/D analog-digital converter U2 of signal receiving module, and the other end links to each other with power regulator module (6).
9, electronic controller according to claim 1, it is characterized in that above-mentioned power regulator module (6) includes diode D1 and D2, voltage stabilizing chip U6, the positive pole of diode D1 is connected with power supply, negative pole links to each other with the positive pole of diode D2, the negative pole of diode D2 links to each other with the input end of voltage stabilizing chip U6, power regulator module (6) connects the 12V stabilized power supply, or adopts automobile 24V storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710029056XA CN100535417C (en) | 2007-07-06 | 2007-07-06 | Electronic controller of electron controlled exhaust gas recirculation system in diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710029056XA CN100535417C (en) | 2007-07-06 | 2007-07-06 | Electronic controller of electron controlled exhaust gas recirculation system in diesel engine |
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| Publication Number | Publication Date |
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| CN101092911A CN101092911A (en) | 2007-12-26 |
| CN100535417C true CN100535417C (en) | 2009-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200710029056XA Expired - Fee Related CN100535417C (en) | 2007-07-06 | 2007-07-06 | Electronic controller of electron controlled exhaust gas recirculation system in diesel engine |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103267633B (en) * | 2013-04-25 | 2016-01-20 | 同济大学 | For determining the Auto-Test System of lift of EGR valve |
| CN104074639B (en) * | 2014-07-16 | 2016-04-27 | 无锡隆盛科技股份有限公司 | A kind of direct current generator EGR valve controller |
| DE102015214363A1 (en) * | 2015-07-29 | 2017-02-02 | Robert Bosch Gmbh | Method for processing sensor signals |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4794903A (en) * | 1986-02-14 | 1989-01-03 | Mitsubishi Denki Kabushiki Kaisha | Recirculated exhaust gas quantity control apparatus for internal combustion engine |
| CN1664342A (en) * | 2005-03-18 | 2005-09-07 | 上海绍博车辆动力装置科技有限公司 | Engine electric control EGR system for vehicle |
| CN2916168Y (en) * | 2006-06-06 | 2007-06-27 | 常州星尼韦尔电器有限公司 | Exhaust gas recirculation system for diesel engine |
| CN201065792Y (en) * | 2007-07-06 | 2008-05-28 | 广东工业大学 | Diesel engine electronic control waste gas recirculation system electronic controller |
-
2007
- 2007-07-06 CN CNB200710029056XA patent/CN100535417C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4794903A (en) * | 1986-02-14 | 1989-01-03 | Mitsubishi Denki Kabushiki Kaisha | Recirculated exhaust gas quantity control apparatus for internal combustion engine |
| CN1664342A (en) * | 2005-03-18 | 2005-09-07 | 上海绍博车辆动力装置科技有限公司 | Engine electric control EGR system for vehicle |
| CN2916168Y (en) * | 2006-06-06 | 2007-06-27 | 常州星尼韦尔电器有限公司 | Exhaust gas recirculation system for diesel engine |
| CN201065792Y (en) * | 2007-07-06 | 2008-05-28 | 广东工业大学 | Diesel engine electronic control waste gas recirculation system electronic controller |
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