CN201358851Y - Exhaust Gas Recirculation (EGR) System of a positive pressure-type diesel - Google Patents
Exhaust Gas Recirculation (EGR) System of a positive pressure-type diesel Download PDFInfo
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- CN201358851Y CN201358851Y CNU2009200359678U CN200920035967U CN201358851Y CN 201358851 Y CN201358851 Y CN 201358851Y CN U2009200359678 U CNU2009200359678 U CN U2009200359678U CN 200920035967 U CN200920035967 U CN 200920035967U CN 201358851 Y CN201358851 Y CN 201358851Y
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- egr
- valve
- resistance
- positive pressure
- pressure type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model relates to the field of an Exhaust Gas Recirculation (EGR) System of an internal-combustion engine, in particular to an EGR System of a positive pressure-type diesel which is suitable for a heavy duty car. The EGR system comprises an electrical control unit, an EGR valve, and a position transducers of the EGR valve, wherein, the EGR valve is arranged on by-pass pipes of the exhaust pipe and the air inlet pipe of the diesel; the system further comprises a positive pressure-type electromagnetic valve which controls the opening degree of the EGR valve; the control end of the EGR valve is connected with the output end of the positive pressure-type electromagnetic valve; the input end of the positive pressure-type electromagnetic valve is connected with a positive pressure gas source; and the electrical control unit is connected with the control end of the positive pressure-type electromagnetic valve and the signal output terminal of the position transducer of the EGR valve. The utility model provides an EGR technical with a lower application cost for enabling the tail gas emission of a heavy duty diesel car to reach the National III standard, has the advantages of relatively fast operation of a system component and high control precision, and can meet the requirements of the working condition variation of the practical application of the diesel used by the heavy duty car.
Description
Technical field
The utility model relates to engine exhaust gas recirculating system field, especially a kind of positive pressure type diesel engine waste gas recycling system that is applicable to heavy-duty car.
Background technique
The state III emission standard of China is formulated with reference to Europe III emission standard, heavy goods vehicles phase III emission standard just, the concentration of CO (carbon monoxide), HC+NOx (hydrocarbon and nitrogen oxide), PM harmful gases such as (particulate, soots) is than the low 30%-50% of the vehicle that satisfies " state II " emission standard in the vehicle exhaust of satisfied " state III " emission standard.Present diesel engine reaches state's III standard and mainly contains 4 kinds of technology paths, comprises Electrocontrolled high-pressure common rail technology, electrically-controlled pump nozzle technology, electronically controlled unit pump technology, still uses these technical costs height and core technology complete monopoly in foreign corporation's hand.Also having a kind of technology is gas recirculation system (EGR), this technology is exactly that part waste gas with diesel emission sends back in the suction tude with after fresh air mixes again and enters cylinder combustion, it can make the oxygen concentration in the cylinder descend, and reduces maximum combustion temperature, thereby suppresses NO
XGeneration.But generally the device of control EGR valve opening is a vacuum solenoid in the egr system that uses on diesel engine, use vacuum solenoid to need vacuum source, on the light diesel automobile, just has the employed vacuum source of vacuum solenoid, and not possessing vacuum source on the heavy-duty diesel oil automobile, the egr system of original use vacuum solenoid control EGR valve opening just can't use on the heavy-duty diesel oil automobile.
Summary of the invention
In order to overcome the deficiency that existing egr system can't use on the heavy-duty diesel oil automobile, the purpose of this utility model provides a kind of positive pressure type diesel engine waste gas recycling system.
Technology and case that its technical problem that solves the utility model adopts are: a kind of positive pressure type diesel engine waste gas recycling system, comprise that ECU (Electrical Control Unit), EGR valve and EGR position sensor of valve, EGR valve are arranged on the bypass tube of Diesel Engine Exhaust Pipe and suction tude, system also comprises the positive-pressure type solenoid valve of control EGR valve opening, the output terminal that connects the positive-pressure type solenoid valve at the control end of EGR valve, the input end of positive-pressure type solenoid valve connects the malleation source of the gas, and ECU (Electrical Control Unit) is connected with the control end of positive-pressure type solenoid valve, the signal output part of EGR position sensor of valve.
System also includes rotation speed detection unit, water temperature detection unit and accelerator open degree detection unit and clutch switch unit, and ECU (Electrical Control Unit) is connected with the clutch switch unit with rotation speed detection unit, water temperature detection unit and accelerator open degree detection unit respectively.
The used sensor of water temperature detection unit is a negative temperature coefficient standard thermistor, and the temperature signal that records exports ECU (Electrical Control Unit) to.
Accelerator open degree detection unit and EGR position sensor of valve are electric resistance partial pressure output, directly cause ECU (Electrical Control Unit) behind the coupling capacitor filtering.
ECU (Electrical Control Unit) also is connected with the signal lamp unit, and ECU (Electrical Control Unit) adopts single-chip microcomputer.
Revolution for the high-precision test motor, the design speed detection unit adopts magnetoelectric velocity transducer, resistance R 11, resistance R 12, resistance R 2, resistance R 3, capacitor C, diode D, amplifier L, the output terminal SPEEDH end of magnetoelectric velocity transducer is connected with the in-phase input end of amplifier L by resistance R 11, the output terminal SPEEDL end of magnetoelectric velocity transducer is by resistance R 12 ground connection, capacitor C, diode D and resistance R 2 parallel connections, capacitor C, the negative terminal of resistance R 2 one ends and diode D is connected on the circuit between R11 and the amplifier L, their the other end ground connection, the tie point ground connection that the end of oppisite phase of amplifier L is introduced the end of oppisite phase of reference potential resistance R 3 and amplifier L by resistance R 3.
The beneficial effects of the utility model are: provide a kind of application cost lower EGR technology for the exhaust emissions of heavy diesel car reaches state's III standard, and employing single-chip microcomputer, high-accuracy speed detection unit and water temperature detection unit have been designed simultaneously, system unit action is corresponding rapidly, the control accuracy height, can satisfy the requirement of heavy-duty car with the working conditions change of the actual use of diesel engine.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the circuit diagram of speed detection unit of the present utility model.
Among the figure, 1. ECU (Electrical Control Unit), 2.EGR valve, 3.EGR position sensor of valve, 4. positive-pressure type solenoid valve, 5. rotation speed detection unit, 6. water temperature detection unit, 7. accelerator open degree detection unit, 8. clutch switch unit, 9. malleation source of the gas, 10. signal lamp unit.
Embodiment
Diesel engine waste gas recycling system as shown in Figure 1 comprises that positive-pressure type solenoid valve 4, the EGR valve 2 of ECU (Electrical Control Unit) 1, EGR valve 2, EGR position sensor of valve 3 and control EGR valve 2 apertures are arranged on the bypass tube of Diesel Engine Exhaust Pipe and suction tude, the output terminal that connects positive-pressure type solenoid valve 4 at the control end of EGR valve 2, the input end of positive-pressure type solenoid valve 4 connects malleation source of the gas 9, and ECU (Electrical Control Unit) 1 is connected with the control end of positive-pressure type solenoid valve 4, the signal output part of EGR position sensor of valve 3.ECU (Electrical Control Unit) 1 also is connected with clutch switch unit 8 with rotation speed detection unit 5, water temperature detection unit 6 and accelerator open degree detection unit 7 respectively.The attach most importance to brake malleation source of the gas of type automobile of the malleation source of the gas here.
ECU (Electrical Control Unit) 1 calculates the aperture of needed EGR valve 2 according to the real-time working status data, and the output port that passes through ECU (Electrical Control Unit) 1 is controlled the aperture that positive-pressure type solenoid valve 4 is regulated EGR valves 2, the actual opening value of EGR position sensor of valve 3 feedback EGR valves 2 is convenient to ECU (Electrical Control Unit) 1 and is carried out PID calculating.
ECU (Electrical Control Unit) 1 adopts the MC68HC908S of Motorola chip.The MC68HC908S chip according to the real-time working condition data (as revolution, accelerator open degree, water temperature etc.) calculate required EGR valve 2 apertures, and the form of passing through pulsewidth modulation (PWM) signal of MC68HC908S chip output pin is exported, after amplifying, power amplification circuit outputs to the electromagnetic coil of positive-pressure type solenoid valve 4, with the aperture of control EGR valve 2.EGR position sensor of valve 3 is used to feed back the actual opening value of EGR valve 2, calculates so that the MC68HC908S chip carries out digital PID.
The design's rotation speed detection unit 5 has easy RC eliminator such as Fig. 2, rotation speed detection unit 2 adopts magnetoelectric velocity transducer, resistance R 11, resistance R 12, resistance R 2, resistance R 3, capacitor C, diode D, amplifier L, the output terminal SPEEDH end of magnetoelectric velocity transducer is connected with the in-phase input end of amplifier L by resistance R 11, the output terminal SPEEDL end of magnetoelectric velocity transducer is by resistance R 12 ground connection, capacitor C, diode D and resistance R 2 parallel connections, capacitor C, the negative terminal of resistance R 2 one ends and diode D is connected on the circuit between R11 and the amplifier L, their the other end ground connection, the end of oppisite phase of amplifier L is introduced reference potential by resistance R 3, the tie point ground connection of the end of oppisite phase of resistance R 3 and amplifier L.By regulating R11, R12, parameters such as R2, C, the voltage peak that can make the amplifier in-phase input end obtains the rectangular pulse signal that frequency is directly proportional with rotating speed with the variation of revolution again with after the reference potential of amplifier inverting input compares in a reasonable range.
Water temperature detection unit 6 used sensors are negative temperature coefficient standard thermistor, and the temperature signal that records exports the A/D input end of MC68HC908S chip to, by by formula calculating measured temperature value after the MC68HC908S chip sampled.
Accelerator open degree detection unit 7 and EGR position sensor of valve 3 are electric resistance partial pressure output, directly cause the A/D input end of MC68HC908S chip behind the coupling capacitor filtering.
The output terminal of ECU (Electrical Control Unit) 1 also is connected with signal lamp circuit 10, is used to show the fault message of egr system.
ECU (Electrical Control Unit) 1 is gathered engine speed in real time, and throttle position is on the cooling water temperature basis, according to the aperture of control strategy control EGR valve 2.According to the position aperture of real-time collection EGR valve 2, realize the PID control of EGR valve 2 by the scm software of ECU (Electrical Control Unit) 1.In addition, program have the fault self-checking warning function and and host computer monitoring software, the function of hand-held scaler communication.
Monitoring software is the ipc monitor program of whole EGR supervisory system, and major function is on-line proving and monitoring.
Major function comprises:
(1) reads and revise parameters, comprising: machine ID, sequence number, throttle minimum, maximum calibration value.The valve opening minimum, maximum value, three temperature spots AD values, PID regulates parameter, the time lag that the clutch on off delay is regulated, speed ratio value (maximum revolution), revolution pulse etc.
(2) uploading of MAP figure downloaded, and preserves, and calls in, and imports, and derives.
(3) monitoring in real time, begin monitoring and stop monitoring, monitor data comprises: place, control point MAP (0-3), the ranks of place, control point MAP (0-3), the revolution at control point, the throttle percentage at control point, the water temperature at control point, the valve control aperture percentage at control point, the valve opening feedback percentage at control point, the clutch on off operating mode at control point and the demonstration of fault.
(4) preservation of monitor data is opened, and prints, and protects functions such as table.
The establishment of database and compression recover.
Claims (6)
1, a kind of positive pressure type diesel engine waste gas recycling system, comprise ECU (Electrical Control Unit) (1), EGR valve (2) and EGR position sensor of valve (3), EGR valve (2) is arranged on the bypass tube of Diesel Engine Exhaust Pipe and suction tude, it is characterized in that: the positive-pressure type solenoid valve (4) that also comprises control EGR valve (2) aperture, the output terminal that connects positive-pressure type solenoid valve (4) at the control end of EGR valve (2), the input end of positive-pressure type solenoid valve (4) is connected with malleation source of the gas (9), the control end of ECU (Electrical Control Unit) (1) and positive-pressure type solenoid valve (4), the signal output part of EGR position sensor of valve (3) connects.
2, positive pressure type diesel engine waste gas recycling system according to claim 1, it is characterized in that: also include rotation speed detection unit (5), water temperature detection unit (6) and accelerator open degree detection unit (7) and clutch switch unit (8), described ECU (Electrical Control Unit) (1) is connected with clutch switch unit (8) with rotation speed detection unit (5), water temperature detection unit (6) and accelerator open degree detection unit (7) respectively.
3, positive pressure type diesel engine waste gas recycling system according to claim 2 is characterized in that: the used sensor of described water temperature detection unit (6) is a negative temperature coefficient standard thermistor, and the temperature signal that records exports ECU (Electrical Control Unit) (1) to.
4, positive pressure type diesel engine waste gas recycling system according to claim 2 is characterized in that: described accelerator open degree detection unit (7) and EGR position sensor of valve (3) directly cause ECU (Electrical Control Unit) (1) for electric resistance partial pressure output behind the coupling capacitor filtering.
5, positive pressure type diesel engine waste gas recycling system according to claim 1 is characterized in that: described ECU (Electrical Control Unit) (1) also is connected with signal lamp unit (10), and ECU (Electrical Control Unit) (1) adopts single-chip microcomputer.
6, positive pressure type diesel engine waste gas recycling system according to claim 2, it is characterized in that: described rotation speed detection unit (5) adopts magnetoelectric velocity transducer, resistance R 11, resistance R 12, resistance R 2, resistance R 3, capacitor C, diode D, amplifier L, the output terminal SPEEDH end of magnetoelectric velocity transducer is connected with the in-phase input end of amplifier L by resistance R 11, the output terminal SPEEDL end of magnetoelectric velocity transducer is by resistance R 12 ground connection, capacitor C, diode D and resistance R 2 parallel connections, capacitor C, the negative terminal of resistance R 2 one ends and diode D is connected on the circuit between R11 and the amplifier L, their the other end ground connection, the tie point ground connection that the end of oppisite phase of amplifier L is introduced the end of oppisite phase of reference potential resistance R 3 and amplifier L by resistance R 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200359678U CN201358851Y (en) | 2009-03-05 | 2009-03-05 | Exhaust Gas Recirculation (EGR) System of a positive pressure-type diesel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200359678U CN201358851Y (en) | 2009-03-05 | 2009-03-05 | Exhaust Gas Recirculation (EGR) System of a positive pressure-type diesel |
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| Publication Number | Publication Date |
|---|---|
| CN201358851Y true CN201358851Y (en) | 2009-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200359678U Expired - Fee Related CN201358851Y (en) | 2009-03-05 | 2009-03-05 | Exhaust Gas Recirculation (EGR) System of a positive pressure-type diesel |
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| CN (1) | CN201358851Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723549A (en) * | 2017-10-30 | 2019-05-07 | 宋德伍 | Single cylinder diesel suitable for EGR exhaust recycling |
-
2009
- 2009-03-05 CN CNU2009200359678U patent/CN201358851Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723549A (en) * | 2017-10-30 | 2019-05-07 | 宋德伍 | Single cylinder diesel suitable for EGR exhaust recycling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091209 Termination date: 20170305 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |