CN202789147U - System for controlling combustion of diesel engine under instantaneous work condition - Google Patents
System for controlling combustion of diesel engine under instantaneous work condition Download PDFInfo
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- CN202789147U CN202789147U CN 201220425182 CN201220425182U CN202789147U CN 202789147 U CN202789147 U CN 202789147U CN 201220425182 CN201220425182 CN 201220425182 CN 201220425182 U CN201220425182 U CN 201220425182U CN 202789147 U CN202789147 U CN 202789147U
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 230000001052 transient effect Effects 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract 3
- 239000007858 starting material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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Abstract
The utility model discloses a system for controlling the combustion of a diesel engine under an instantaneous work condition and belongs to the technical field of engine feedback control. The system is formed by sequentially connecting a cylinder pressure sensor, a charge amplifier, a CA50 resolution cell, an EGR (exhaust gas recirculation) control unit and an electrically controlled EGR valve end to end, wherein one end of the electrically controlled EGR valve is connected with a tee; the other end of the electrically controlled EGR valve is sequentially connected with a filter and a cooler; a cam shaft displacement sensor and a crankshaft displacement sensor are connected to the CA50 resolution cell; and a rotation speed sensor and an accelerator pedal displacement sensor are connected to an EGR electric control unit. The CA50 resolution cell is used for calculating real-time CA50, the real-time CA50 is transmitted to the EGR electric control unit through a CAN bus, the EGR electric control unit controls the opening degree of the electrically controlled EGR valve, CA50 is controlled by controlling the opening degree of the electrically controlled EGR valve, and the emission and the economy of an engine are improved. The system is suitable for various diesel engines, particularly the large-power diesel engine for a vehicle.
Description
Technical field
The utility model belongs to motor feedback control technology field, is specifically related to the diesel combustion control system under a kind of instantaneous conditions.
Background technique
Along with highlighting of the in short supply and environmental problem of petroleum resources, the diesel combustion quality is had higher requirement.Improve the engine combustion quality, can improve fuel availability, also improved the emission controls by improving combustion degree and reduced discharging to reduce the pressure of preprocessor.
CA50 is the corresponding crank angle of 50% burning quality, is the important parameter that characterizes engine combustion process, is reflecting the Economy of engine working process.Δ CA50 (change of CA50 between each circulation) increases, and the engine emission smoke intensity worsens, the Economy variation.Control Δ CA50 makes it less in the combustion process, and the thermal efficiency higher with acquisition improves fuel economy, and the discharging that reduces smoke intensity is consistent.
The EGR technology has become diesel engine for automobile and has reduced one of important means of NOx discharging and control combustion speed and combustion phase.Under steady state condition EGR lead CA50 impact limited, but in transient process, CA50 changes obviously with the EGR variance ratio, therefore can lead by the EGR under the control instantaneous conditions purpose that reaches control Δ CA50.
Summary of the invention
The problem that the utility model solves is: under transient condition, provide a kind of closed-loop feedback control system, as feedback parameter, lead control CA50 by control EGR with CA50, reach and reduce △ CA50, improve smoke emission and improve the purpose of Economy.
The technical solution adopted in the utility model is: set up the target CA50 arteries and veins spectrum under the different operating modes, calculate in real time CA50 by the CA50 resolution unit, CA50 compares with target.According to difference between the two, send the driving signal by the EGR ECU (Electrical Control Unit) to the electric control EGR valve, suitable position is arrived in the electric control EGR valve regulation.
The utility model is by electric control EGR valve 1, filter 2, cooler I 3, gas compressor 4, turbo machine 5, threeway 6, engine exhaust house steward 7, engine rotation speed sensor 8, CMPS Camshaft Position Sensor 9, crankshaft position sensor 10, cylinder pressure sensor 11, engine intake manifold 12, cooler II 13, charge amplifier 14, CA50 resolution unit 15, CAN bus 16, EGR ECU (Electrical Control Unit) 17, accelerator pedal position sensor 18 and switch starter 19 form, wherein CMPS Camshaft Position Sensor 9 is connected with crankshaft position sensor and is connected with CA50 resolution unit 15, is used for calculating CA50; Engine rotation speed sensor 8 is connected with accelerator pedal position sensor and is connected with EGR ECU (Electrical Control Unit) 17, is used for judging operating mode, to determine target CA50; Cylinder pressure sensor 11 is connected with CA50 resolution unit 15 through charge amplifier 14; Switch starter 19 1 ends are connected with CA50 resolution unit 15, and switch starter 19 the other ends are connected with EGR ECU (Electrical Control Unit) 17; CA50 resolution unit 15 is connected with the EGR ECU (Electrical Control Unit) by 16 connections of CAN bus; The entrance of threeway 6 is connected with engine exhaust house steward 7, and an outlet of threeway 6 is connected with turbo machine 5, and another outlet of threeway 6 is connected with electric control EGR valve 1 entrance; Electric control EGR valve 1 outlet is connected with cooler I through filter 2 and is connected with the entrance of gas compressor 4, and the aperture change EGR by change electric control EGR valve 1 leads; The outlet of gas compressor 4 is connected with engine intake manifold 12 through cooler II 13.
To single-chip microcomputer I 22 power supplies, bent axle, camshaft-position signal 24 and cylinder press signal 25 to transmit to single-chip microcomputer I 22 through signal processing circuit I 23 to storage battery I 20 through power circuit I 21 in the described CA50 resolution unit 15.
To respectively single-chip microcomputer II 29 and 28 power supplies of electric control EGR valve-driving circuit, electric control EGR valve 1 is by 28 controls of electric control EGR valve-driving circuit through power circuit II 27 for storage battery II 26 in the described EGR ECU (Electrical Control Unit) 17; Accelerator pedal position signal 31 and engine rotational speed signal 32 transmit to single-chip microcomputer II 29 through signal processing circuit II 30.
Motor A obtains crankshaft-position signal by crankshaft position sensor 10, obtains camshaft-position signal by CMPS Camshaft Position Sensor 9, and they are passed to CA50 resolution unit 15; Camshaft-position signal is used for judging that motor is in compression top center or exhaust top dead center; Cylinder pressure sensor 11 measures cylinder press signal 25 to amplify by charge amplifier 14 after, be sent to CA50 resolution unit 15; CA50 resolution unit 15 is calculated real-time CA50 after carrying out analysing and processing to the received signal; The real-time CA50 that CA50 resolution unit 15 will calculate passes to EGR ECU (Electrical Control Unit) 17 by CAN bus 16; The real-time CA50 that EGR ECU (Electrical Control Unit) 17 will receive and current working target CA50 contrast utilize the PI controller to calculate the value of the PWM that drives electric control EGR valve 1, export to electric control EGR valve-driving circuit 28.Regulate electric control EGR valve 1 aperture.Out by threeway 6, a part drives turbo machine 5 actings to engine exhaust from engine exhaust house steward 7; A part enters into engine intake manifold 12 through electric control EGR valve 1, changes propellant composition, thereby realizes burning control.
Power circuit I 21 is responsible for whole CA50 resolution unit 15 power supplies in the CA50 resolution unit 15; Signal processing circuit I23 is responsible for pressing signal 25 to process to the cylinder of cylinder pressure sensor 11 outputs, the high-frequency noise that elimination may occur, and solve the common Zero drift in main amplifier of cylinder pressure sensor 11; Synchronous signal processing circuit I 23 can process bent axle, camshaft-position signal 24; The output terminal of signal processing circuit I 23 is connected with the signal input part of single-chip microcomputer I 22, and single-chip microcomputer I 22 is according to the real-time CA50 of gained calculated signals.CA50 resolution unit 15 realizes that by CAN bus 16 communication circuit one end is connected with the CAN interface of the single-chip microcomputer I 22 of CA50 resolution unit 15 with communicating by letter of EGR ECU (Electrical Control Unit) 17, and the other end is connected with the CAN interface of the single-chip microcomputer I 22 of EGR control unit 17.
Power circuit II 27 is responsible for whole EGR ECU (Electrical Control Unit) 17 power supplies in the EGR ECU (Electrical Control Unit) 17; Single-chip microcomputer II 29 receives the real-time CA50 data that CAN bus 16 transmits, the real-time CA50 that single-chip microcomputer II 29 will receive and current working target CA50 contrast, utilize the PI controller to calculate the value of the PWM that drives the electric control EGR valve, export to electric control EGR valve-driving circuit 28; The input end of electric control EGR valve-driving circuit 28 is connected with the PWM output terminal of single-chip microcomputer II 29, and the output terminal of electric control EGR valve-driving circuit 28 is connected with electric control EGR valve 1.
Working principle of the present utility model is as follows:
Working procedure of the present utility model is as follows: when diesel engine for automobile was started working, switch starter 19 was connected, and CA50 resolution unit 15 powers on, and CA50 resolution unit 15 is started working.At first, control program begins initialization operation, sets the value of relevant register, and relevant parameter is read among the RAM.Subsequently, control program is opened interrupt operation, opens take 10 milliseconds of major cycle control programs as the cycle.The major cycle control program judges whether 10 milliseconds of time cycles arrive afterwards, if do not have, continues to wait for, if arrive, then enters the collecting sensor signal module.The collecting sensor signal module gathers cylinder and presses signal 25, and bent axle, camshaft-position signal 24, signal processing circuit I 23 are processed it, then deposit among the RAM.Main program enters the CA50 computing module afterwards, calculates real-time CA50 according to parameters obtained.The real-time CA50 that calculates sends on the CAN bus 16 by communication circuit.
After switch starter 19 was connected, EGR ECU (Electrical Control Unit) 17 powered on, and EGR ECU (Electrical Control Unit) 17 is started working.At first, control program begins initialization operation, sets the value of relevant register, and the relevant control parameter is read among the RAM.Control program is opened interrupt operation subsequently, opens take 10 seconds major cycle control programs as the cycle.The major cycle control program judges whether 10 milliseconds of time cycles reach afterwards, if do not have, continues to wait for, if arrive, then enters the collecting sensor signal module.The collecting sensor signal module gathers engine rotational speed signal 32, accelerator pedal position signal 31.Signal processing circuit II 30 deposits among the RAM after it is processed.Main program enters EGR and leads control module afterwards, according to the requirement of above-mentioned working principle, calculates drive signal value, exports to electric control EGR valve 1.
The utility model compared with prior art has the following advantages and beneficial effect:
1. utilize closed loop control system control diesel combustion, can reduce because the impact that the difference of motor manufacturing and fit on causes the performance of motor.
2.CA50 Economy and discharging to motor have a great impact, and can effectively improve discharging and the Economy of motor as the control target with △ CA50.
3. EGR leads CA50 impact greatlyr under instantaneous conditions, leads as control device take EGR, can effectively control △ CA50, improves Economy and the discharging of motor.
4. realize the real-time Transmission of data between the automatical control system with the CAN bus, can improve speed and the reliability of data transmission.
5. the utility model is fit to various diesel engines, especially powerful diesel engine for automobile.
Description of drawings
Fig. 1 is the structural representation of the diesel combustion control system under the instantaneous conditions
Fig. 2 is CA50 resolution unit structural representation
Fig. 3 is EGR ECU (Electrical Control Unit) structural representation
Of which: A. Engine 1. Electronically controlled EGR valve 2 Filter 3. Cooler I 4. Compressor 5. Turbine 6. Tee 7 engine exhaust manifold 8 engine speed sensor 10. Camshaft position sensor 10. crankshaft position sensor 11. cylinder pressure sensor 12. engine intake manifold 13. cooler Ⅱ 14. charge amplifier 15.CA50 parsing unit 16.CAN bus 17.EGR electronic control unit 18. accelerator pedal position sensor 19. starter switch 20. battery I 21. power circuit I 22. microcontroller I 23. signal processing circuit I 24. crankshaft, camshaft position signal 25. cylinder pressure signal 26. battery Ⅱ 27. power circuit II 28. electrically controlled EGR valve drive circuit 29. SCM II 30. signal processing circuit Ⅱ 31. accelerator pedal position signal 32 is the engine speed signal
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
Combustion control system under a kind of diesel transient operating mode of the present utility model, it connects as shown in Figure 1, it is by electric control EGR valve 1, filter 2, cooler I 3, gas compressor 4, turbo machine 5, threeway 6, engine exhaust house steward 7, engine rotation speed sensor 8, CMPS Camshaft Position Sensor 9, crankshaft position sensor 10, cylinder pressure sensor 11, engine intake manifold 12, cooler II 13, charge amplifier 14, CA50 resolution unit 15, CAN bus 16, EGR ECU (Electrical Control Unit) 17, accelerator pedal position sensor 18 and switch starter 19 forms, and wherein CMPS Camshaft Position Sensor 9 is connected with crankshaft position sensor and is connected with CA50 resolution unit 15; Engine rotation speed sensor 8 is connected with accelerator pedal position sensor and is connected with EGR ECU (Electrical Control Unit) 17; Cylinder pressure sensor 11 is connected with CA50 resolution unit 15 through charge amplifier 14; Switch starter 19 1 ends are connected with CA50 resolution unit 15, and switch starter 19 the other ends are connected with EGR ECU (Electrical Control Unit) 17; CA50 resolution unit 15 is connected with the EGR ECU (Electrical Control Unit) by 16 connections of CAN bus; The entrance of threeway 6 is connected with engine exhaust house steward 7, and an outlet of threeway 6 is connected with turbo machine 5, and another outlet of threeway 6 is connected with electric control EGR valve 1 entrance; Electric control EGR valve 1 outlet is connected with cooler I through filter 2 and is connected with the entrance of gas compressor 4; The outlet of gas compressor 4 is connected with engine intake manifold 12 through cooler II 13.
The structure of the CA50 resolution unit 15 of the diesel combustion control system under the instantaneous conditions as shown in Figure 2.Comprise power circuit I 21 in the CA50 resolution unit 15, single-chip microcomputer I 22, signal processing circuit I 23.Power circuit I 21 is responsible for whole CA50 resolution unit 15 power supplies; Signal processing circuit I 23 is responsible for pressing signal 25, crankshaft cam shaft position signal 24 to process to cylinder; The signal of 22 pairs of inputs of single-chip microcomputer I carries out analytical calculation and obtains real-time CA50.CA50 resolution unit 15 is realized by CAN bus 16 with communicating by letter of EGR ECU (Electrical Control Unit) 17, communication circuit one end is connected with the CAN interface of the single-chip microcomputer I 22 of CA50 resolution unit 15, and the communication circuit the other end is connected with the CAN interface of the single-chip microcomputer II 29 of EGR ECU (Electrical Control Unit) 17.
The structure of the EGR ECU (Electrical Control Unit) 17 of the diesel combustion control system under the instantaneous conditions as shown in Figure 3.EGR ECU (Electrical Control Unit) 17 is by power circuit II 27, single-chip microcomputer II 29, and electric control EGR valve-driving circuit 28 forms.Power circuit II 27 is responsible for whole EGR ECU (Electrical Control Unit) 17 power supplies; Single-chip microcomputer II 29 receives the real-time CA50 data that CAN bus 16 transmits, the real-time CA50 that single-chip microcomputer II 29 will receive and current working target CA50 contrast, utilize the PI controller to calculate the value of the PWM that drives the electric control EGR valve, export to electric control EGR valve-driving circuit 28; The output terminal of electric control EGR valve-driving circuit 28 is connected with electric control EGR valve 1.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220425182 CN202789147U (en) | 2012-08-26 | 2012-08-26 | System for controlling combustion of diesel engine under instantaneous work condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220425182 CN202789147U (en) | 2012-08-26 | 2012-08-26 | System for controlling combustion of diesel engine under instantaneous work condition |
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| CN202789147U true CN202789147U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220425182 Expired - Fee Related CN202789147U (en) | 2012-08-26 | 2012-08-26 | System for controlling combustion of diesel engine under instantaneous work condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775925A (en) * | 2015-04-13 | 2015-07-15 | 吉林大学 | Control system and control method capable of reducing smoke intensity of diesel under transient operating condition |
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2012
- 2012-08-26 CN CN 201220425182 patent/CN202789147U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775925A (en) * | 2015-04-13 | 2015-07-15 | 吉林大学 | Control system and control method capable of reducing smoke intensity of diesel under transient operating condition |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20130826 |