CN103061909A - Method for improving low-temperature combustion soot emission and fuel economy of diesel engine - Google Patents
Method for improving low-temperature combustion soot emission and fuel economy of diesel engine Download PDFInfo
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Abstract
The invention discloses a method for improving low-temperature combustion soot emission and fuel economy of a diesel engine. The method includes the steps of firstly, a control unit reads a rotation speed signal of a sensor mounted on a crankshaft of the engine and an engine load signal of a sensor mounted at an accelerator pedal, and judges operation load and rotation speed of the engine according to the engine load signal and the rotation speed signal; and secondly, a control signal is output according to the judging result obtained in the first step. EGR (exhaust gas recirculation) rate when low-temperature combustion soot emission increases evidently is delayed effectively by the method, EGR tolerance is increased from 35% to above 55%, and soot emission peak is lowered effectively.
Description
Technical field
The present invention relates to field of internal combustion engine, particularly a kind of method that reduces Low Temperature Combustion of Diesel Engine process carbon smoke exhaust, improves the low-temperature burning fuel economy.
Background technique
Diesel engine is widely used in the fields such as urban public transport, logistics transportation, engineering machinery with the characteristics of its high moment of torsion, low oil consumption.But because causing, the substantive characteristics of diesel engine diffusive combustion has obvious partial mixture overrich district and high-temperature zone in the cylinder, so that diesel engine has higher soot and discharged nitrous oxides.And, the soot of diesel engine and the control strategy of discharged nitrous oxides are conflicting, the measure that namely reduces carbon smoke exhaust tends to cause discharged nitrous oxides to raise, therefore when control diesel engine carbon black and discharged nitrous oxides, always try hard to look for one and can make soot and the compromise control strategy of discharged nitrous oxides, i.e. so-called trade-off relation.
Over past ten years, Low Temperature Combustion of Diesel Engine is as a kind of novel combustion mode, break through conventional diesel engine diffusive combustion concept, realizing showing great potential aspect the burning of diesel engine high-efficiency cleaning, become forward position and the focus of international combustion in IC engine science and technology research.Low Temperature Combustion of Diesel Engine is by adopting vast scale EGR strategy, and effective prolonging combustion delay period also reduces combustion temperature, thereby changes mixture strength and the temperature development course of in-cylinder combustion course of reaction, avoids NO
xWith the Soot Formation zone, realize the control to the noxious emission product, broken away from NO in the diesel engine traditional combustion
xWith the trade-off relation of soot, think to satisfy the main combustion mode of the strict Abgasgesetz of following diesel engine.
Low Temperature Combustion of Diesel Engine process vast scale EGR makes NO
xDischarging is close to zero, but EGR is complicated on the carbon smoke exhaust impact: low ratio EGR makes carbon smoke exhaust quite or slightly raises; When EGR brought up to certain proportion, carbon smoke exhaust raise rapidly, the soot peak region occurred; After EGR led and further improves, carbon smoke exhaust began obvious reduction, even reached zero carbon smoke exhaust.As seen, the low soot of Low Temperature Combustion of Diesel Engine and low NO
xDischarging is confined under the specific EGR ratio, and the research carbon smoke exhaust that also shows the low-temperature burning process to EGR lead change very sensitive, in the zone of EGR at high proportion (approximately 50%), EGR leads the rapid increase that tiny variation might cause carbon smoke exhaust, has enlarged markedly the difficulty of burning control.In addition, in the zone of EGR at high proportion, although soot and discharged nitrous oxides all are close to zero, fuel economy significantly worsens, and generates a large amount of HC and CO.Therefore, the problem that faces of Low Temperature Combustion of Diesel Engine mainly is following 2 aspects: 1) reducing NO
xIn the time of with carbon smoke exhaust, how to keep high thermal efficiency and low HC, CO discharging; 2) how to reduce the low-temperature burning process to the receptance of EGR, the controllability of raising Low Temperature Combustion of Diesel Engine process.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, provide and effectively to reduce the low-temperature burning process leads variation to EGR receptance, improve the controllability of Low Temperature Combustion of Diesel Engine process, finally obtain a kind of Low Temperature Combustion of Diesel Engine carbon smoke exhaust and fuel economy method improved of high-efficiency cleaning Low Temperature Combustion of Diesel Engine process.
A kind of Low Temperature Combustion of Diesel Engine carbon smoke exhaust and fuel economy method improved of the present invention, it may further comprise the steps:
(1) control unit reads respectively the tach signal that is installed in the sensor on the engine crankshaft, the engine load signal that is installed in the sensor on the gas pedal and judges load and the rotating speed operating mode of motor operation according to described tach signal and engine load signal;
(2) if the judged result in the step (1) is middle-low load working condition, the inlet air conditions controller is according to the intake temperature parameter output control signal of the intake air temperature sensor that reads, and controlling method is as follows: reduce high pressure stage in high pressure stage and the low pressure stage exhaust gas recirculation circuit and the aperture of low pressure stage cooler for recycled exhaust gas aperture and upper the first second level intercooler of intake manifold; Simultaneously electronic control unit control spray cone angle is that the oil spout of the little spray-cone angle oil sprayers of 140 degree is the budc 0-10 Shaft angle of writing music constantly;
(3) if the judged result in the step (1) is high load working condition, the inlet air conditions controller is according to the intake temperature parameter output control signal that reads, and controlling method is as follows: the aperture of upper first, second grade intercooler of the high pressure stage in increase high pressure stage and the low pressure stage exhaust gas recirculation circuit and low pressure stage cooler for recycled exhaust gas aperture and intake manifold; The simultaneously electronic control unit oil spout first time of controlling little spray-cone angle oil sprayer is the budc 10-20 Shaft angle of writing music constantly, and the oil spout second time is the atdc 0-26 Shaft angle of writing music constantly;
(4) if the judged result in the step (1) is the middle and slow speed of revolution operating mode, the inlet air conditions controller is according to the suction pressure parameter that reads, the output control signal, controlling method is as follows: turn or close the automatically controlled bypass valve aperture that is installed in the other adapter of engine exhaust down, the inlet air conditions controller is according to the running parameter of loading under the air inlet oxygen concentration parameter that reads and the middle and slow speed of revolution operating mode simultaneously, send pulse command to high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve, the valve opening of regulating high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve makes ER EGR Rate remain on 40%-55%, the part exhausting waste gas of discharging through the exhaust valve of the cylinder this moment high pressure stage cooler for recycled exhaust gas of flowing through, the outlet that one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor forms the high pressure stage exhaust gas recirculation circuit; Flow through high-pressure turbine stage or directly enter the suction port that low pressure stage turbo machine, grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter the low pressure stage gas compressor by automatically controlled bypass valve of another part exhausting waste gas forms the low pressure stage exhaust gas recirculation circuit; The mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms is together through the compression of low pressure stage gas compressor, and the first order of then flowing through intercooler cools off to increase air density, increases air inflow; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and further compresses, and then the waste gas with process high pressure stage exhaust gas recirculation circuit further cools off through second level intercooler again, enters cylinder finally by the intake manifold;
(5) if the judged result in the step (1) is high rotating speed operating mode, the inlet air conditions controller is according to the suction pressure parameter that reads, the output control signal, controlling method is as follows: heighten or the automatically controlled bypass valve aperture of complete opening installation in the other adapter of engine exhaust, the inlet air conditions controller is according to the running parameter of loading under the air inlet oxygen concentration parameter that reads and the high rotating speed operating mode simultaneously, send pulse command to high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve, the valve opening of regulating high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve makes ER EGR Rate remain on 40%-55%, the part exhausting waste gas of discharging through the exhaust valve of the cylinder this moment high pressure stage cooler for recycled exhaust gas of flowing through, the outlet that one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor forms the high pressure stage exhaust gas recirculation circuit; Flow through high-pressure turbine stage or directly enter the suction port that low pressure stage turbo machine, grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter the low pressure stage gas compressor by automatically controlled bypass valve of another part exhausting waste gas forms the low pressure stage exhaust gas recirculation circuit; The mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms is together through the compression of low pressure stage gas compressor, and the first order of then flowing through intercooler cools off to increase air density, increases air inflow; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and further compresses, and then the waste gas with process high pressure stage exhaust gas recirculation circuit further cools off through second level intercooler again, enters cylinder finally by the intake manifold.
Compared with prior art, the present invention has following four aspect advantages:
The first, effectively postpone the EGR that the Low Temperature Combustion of Diesel Engine soot begins to enlarge markedly and lead, the EGR tolerance is brought up to more than 55% from 35%, and the carbon smoke exhaust peak value is effectively reduced;
The second, effectively postpone Low Temperature Combustion of Diesel Engine HC and the CO discharging EGR that begins to increase and lead, the EGR tolerance is brought up to more than 55% from 35%, even and after HC and CO discharging increased, the amplitude of its increase also obviously reduced before;
The 3rd, the present invention increases Low Temperature Combustion of Diesel Engine constant volume combustion ratio, and rate of burning and combustion duration shorten, and heat transfer loss and exhaust loss reduce, exhaust gas by-pass valve is to the optimizing process of high low pressure stage turbine energy distribution in addition, the fuel-economy property improvement 2.5%-5%.
The 4th, EGR leads and changes burning and exhausting and the sex Reduced susceptibility of fuel-economy, thereby the control enforceability that Effective Raise low-temperature burning EGR leads has increased the control window width that Low Temperature Combustion of Diesel Engine EGR leads, and has reduced the control difficulty.
Description of drawings
Fig. 1 is control logic schematic diagram of the present invention;
Fig. 2 is the system schematic of improving the method for Low Temperature Combustion of Diesel Engine carbon smoke exhaust and fuel economy of the present invention;
Fig. 3 is the low compression ratio strong turbulence piston schematic diagram in the present invention system shown in Figure 2;
Fig. 4 adopts the inventive method rear engine carbon smoke exhaust design sketch;
Fig. 5-the 1st, diesel emission and fuel economy design sketch behind employing the present invention;
Fig. 5-the 2nd, Fig. 5-1 y coordinate partial enlarged drawing.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in detail.
As shown in the figure, a kind of Low Temperature Combustion of Diesel Engine carbon smoke exhaust and fuel economy method improved of the present invention, it may further comprise the steps: (1) control unit reads respectively the tach signal that is installed in the sensor on the engine crankshaft, the engine load signal that is installed in the sensor on the gas pedal and judges load and the rotating speed operating mode of motor operation according to described tach signal and engine load signal; (2) if the judged result in the step (1) is middle-low load working condition, inlet air conditions controller 18 is according to the temperature parameter output control signal of the intake air temperature sensor 15 that reads, controlling method is as follows: reduce high pressure stage and low pressure stage cooler for recycled exhaust gas 10 in high pressure stage and the low pressure stage exhaust gas recirculation circuit, 13 apertures and intake manifold upper first, second level intercooler 2,4 aperture, improve the EGR temperature that enters in the intake manifold, obtain higher intake temperature, guarantee the middle-low load combustion stability, reduce middle-low load because the HC that lower combustion temperature produces and CO discharging; Simultaneously electronic control unit 20 control spray cone angles be the oil spout of little spray-cone angle oil sprayers 21 of 140 degree constantly for the budc 0-10 Shaft angle of writing music, engine operation is inscribed when the oil spout of fuel economy optimum, improve fuel economy; (3) if the judged result in the step (1) is high load working condition, the inlet air conditions controller is according to the intake temperature parameter output control signal that reads, controlling method is as follows: the aperture of upper first, second grade intercooler of the high pressure stage in increase high pressure stage and the low pressure stage exhaust gas recirculation circuit and low pressure stage cooler for recycled exhaust gas aperture and intake manifold, reduce and enter the EGR temperature in the suction tude and enter the interior gas temperature of cylinder, obtain larger air inflow, improve the lower combustion of large load space amount than distributing; The oil spout of simultaneously electronic control unit control oil sprayer is the budc 10-20 Shaft angle of writing music constantly; Make oil spout quality larger under the large load can have more fully the time mix with air, in addition for the difficult problem of soot control under the large load, increase once afterwards spray, for the second time oil spout is the atdc 0-26 Shaft angle of writing music constantly; (4) if the judged result in the step (1) is the middle and slow speed of revolution operating mode, the inlet air conditions controller is according to the suction pressure parameter that reads, the output control signal, controlling method is as follows: turn or close the automatically controlled bypass valve aperture that is installed in the other adapter of engine exhaust down, the inlet air conditions controller is according to the running parameter of loading under the air inlet oxygen concentration parameter that reads and the middle and slow speed of revolution operating mode simultaneously, send pulse command to high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve, the valve opening of regulating high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve makes ER EGR Rate (ER EGR Rate refers to enter the ratio of exhaust mass and air inlet gross mass in the cylinder) remain on 40%-55%, the part exhausting waste gas of discharging through the exhaust valve of the cylinder this moment high pressure stage cooler for recycled exhaust gas 10 of flowing through, the outlet that one-way valve 11 and high pressure stage exhaust gas recirculation valve 12 enter high pressure stage gas compressor 3 forms the high pressure stage exhaust gas recirculation circuit; Flow through high-pressure turbine stage or directly enter the suction port that low pressure stage turbo machine 7, grain catcher 8, low pressure stage cooler for recycled exhaust gas 13 and low pressure stage exhaust gas recirculation valve 14 enter the low pressure stage gas compressor by automatically controlled bypass valve of another part exhausting waste gas, form the low pressure stage exhaust gas recirculation circuit, thereby satisfy low-temperature burning to the demand of vast scale EGR, effectively reduce discharged nitrous oxides; The mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms is together through 1 compression of low pressure stage gas compressor, and the first order of then flowing through intercooler 2 cools off to increase air density, increases air inflow; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and further compresses, then the waste gas with process high pressure stage exhaust gas recirculation circuit further cools off through second level intercooler 4 again, enter cylinder finally by the intake manifold, the pressurized effect of two stage compressor can keep entering under the low-temperature burning vast scale EGR amount of fresh air in the cylinder, reduces the empty equivalent proportion of combustion and carbon smoke exhaust.(5) if the judged result in the step (1) is high rotating speed operating mode, the inlet air conditions controller is according to the suction pressure parameter that reads, the output control signal, controlling method is as follows: heighten or the automatically controlled bypass valve aperture of complete opening installation in the other adapter of engine exhaust, the inlet air conditions controller is according to the running parameter of loading under the air inlet oxygen concentration parameter that reads and the high rotating speed operating mode simultaneously, send pulse command to high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve, the valve opening of regulating high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve makes ER EGR Rate remain on 40%-55%, the part exhausting waste gas of discharging through the exhaust valve of the cylinder this moment high pressure stage cooler for recycled exhaust gas of flowing through, the outlet that one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor forms the high pressure stage exhaust gas recirculation circuit; Flow through high-pressure turbine stage or directly enter the suction port that low pressure stage turbo machine, grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter the low pressure stage gas compressor by automatically controlled bypass valve of another part exhausting waste gas forms the low pressure stage exhaust gas recirculation circuit; The mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms is together through the compression of low pressure stage gas compressor, and the first order of then flowing through intercooler cools off to increase air density, increases air inflow; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and further compresses, and then the waste gas with process high pressure stage exhaust gas recirculation circuit further cools off through second level intercooler again, enters cylinder finally by the intake manifold.In the implementation process of step (2)-(5), aperture by temperature transducer 15 and 18 pairs of high pressure stages of inlet air conditions controller and low pressure stage cooler for recycled exhaust gas aperture and upper the first second level intercooler of intake manifold is regulated, and remains intake temperature is carried out proportional-integral-differential (PID) closed loop control; Regulate by pressure transducer 16, oxygen concentration sensor 17,18 pairs of automatically controlled bypass valve of inlet air conditions controller and EGR (EGR) valve opening, remain suction pressure and the empty equivalent proportion of combustion (air inlet composition) are carried out the PID closed loop control, according to above-mentioned different engine operating condition, obtain optimum inlet air conditions.
The compression ratio of the cylinder of described step (1) to the step (5) is 16, and the reducing 23 diameter R1 of the piston 22 of cylinder are 65.6mm, and reentrant diameter is 62.5% with the cylinder bore ratio; Combustion recess 24 depth H 1 are 18.8mm, and pit depth is 17.9% with the cylinder bore ratio, and piston circular arc place radius R 2 is 6mm; Piston ring groove 25 is 4mm apart from apical side height H2.
Be complementary with low compression ratio strong turbulence piston of the present invention simultaneously when the oil spout moment of electronic control unit control oil sprayer, oily bundle can well spread in the firing chamber, evaporate, mixes.
When the piston of combustion chamber reentrant diameter of described little spray cone angle oil sprayer and increase is complementary, reduce early spray burning and strike the possibility that piston-top surface causes wet wall, the low compression ratio firing chamber effectively prolongs ignition time delay simultaneously, thereby further increase the incorporation time of fuel oil and air, the change of the increase of the combustion recess degree of depth and pit circular arc place shape, effectively increase turbulence intensity and turbulent flow conservation rate in the firing chamber, the further mixed process of oil gas before the enhanced burning and between main combustion period, a difficult problem of controlling for soot under the large load in addition, increase once afterwards spray, further promote burning later stage soot and do not fire HC and the oxidation of CO, realize the low temperature clean burning.
Under the different engine operating mode, the low compression ratio firing chamber can effectively prolong ignition time delay equally, thereby further increase the incorporation time of fuel oil and air, the change of the increase of the combustion recess degree of depth and pit circular arc place shape, be conducive to promote turbulence intensity and turbulent flow conservation rate in the firing chamber, the further mixed process of oil gas before the enhanced burning and between main combustion period, especially under high rotating speed, low compression ratio strong turbulence firing chamber can effectively replenish because rotating speed improves causes incorporation time to shorten this problem.
Fig. 2 is a kind of system schematic that realizes the inventive method, it comprises cylinder, air manager system, the Injection strategy control system, described air manager system comprises intake manifold and exhaust manifold, on described intake manifold, along the air inlet flow direction low pressure stage gas compressor 1 is installed successively, first order intercooler 2, high pressure stage gas compressor 3 and second level intercooler 4, described intake manifold's air outlet is connected with the intake valve of cylinder 5, on described exhaust manifold, along discharge directions high-pressure turbine stage 6 is installed successively, low pressure stage turbo machine 7 and grain catcher 8, the suction port of described exhaust manifold is connected with the exhaust valve of cylinder 9, described low pressure stage gas compressor links to each other by rotating shaft with the low pressure stage turbo machine, described high pressure stage gas compressor links to each other by rotating shaft with high-pressure turbine stage, the inlet end of high pressure stage exhaust gas recirculation circuit with at the suction port end of exhaust manifold with the exhaust manifold between the high-pressure turbine stage is connected and the exhaust end of high pressure stage exhaust gas recirculation circuit is connected with 4 the intake manifold who is positioned at high pressure stage gas compressor 3 and second level intercooler, on described high pressure stage exhaust gas recirculation circuit, along inlet end high pressure stage cooler for recycled exhaust gas 10 is housed successively, one-way valve 11 and high pressure stage exhaust gas recirculation valve 12, the inlet end of low pressure stage exhaust gas recirculation circuit is connected with grain catcher 9 gas exhaust piping afterwards that is positioned at exhaust manifold and the outlet side of low pressure stage exhaust gas recirculation circuit is connected with described intake manifold's inlet end, on described low pressure stage exhaust gas recirculation circuit, along inlet end low pressure stage cooler for recycled exhaust gas 13 and low pressure stage exhaust gas recirculation valve 14 are housed successively, between the upstream and downstream of high-pressure turbine stage, exhaust gas by-pass valve is installed, exhaust gas by-pass valve suction port end is connected with the exhaust end of exhaust manifold and its air outlet end is connected with exhaust manifold between low pressure stage turbo machine and high-pressure turbine stage, between the intake valve 5 of intake manifold's air outlet and cylinder, temperature transducer 15 is installed, pressure transducer 16 and oxygen concentration sensor 17, temperature, pressure, oxygen concentration sensor links to each other with inlet air conditions controller (PID) 18 and feedback signal is transferred to the high pressure stage cooler for recycled exhaust gas, the high pressure stage exhaust gas recirculation valve, the low pressure stage cooler for recycled exhaust gas, the low pressure stage exhaust gas recirculation valve, the first order on the intake manifold, second level intercooler and exhaust gas by-pass valve 19; The injection strategy control system comprises that electronic control unit (ECU) 20 and spray cone angle are the little spray-cone angle oil sprayer 21 of 140 degree, described little spray-cone angle oil sprayer is installed on the cylinder, and described electronic control unit links to each other with described little spray-cone angle oil sprayer.In injection strategy control, ECU adjusts oil spout constantly by transmitting control signal to oil sprayer according to the demand of the different Operation Conditions of motor.
As shown in Figure 3, the cylinder inner carrier is low compression ratio strong turbulence piston 22, and the reentrant diameter R1 of described cylinder piston is 65.6mm, is complementary with less spray cone angle, reduces the oil bundle and hits the wall amount, strengthens oil-gas space premixing ability; Piston crater depth H 1 is 18.8mm, and piston crater circular arc place radius R 2 is 6mm, effectively increases turbulence intensity and turbulent flow conservation rate in the firing chamber, further the mixed process of oil gas before the enhanced burning and between main combustion period; Piston ring groove is 4mm apart from apical side height H2, reduces the generation of hydrocarbon in the slit volume and carbon monoxide.This piston structure can form lower compression ratio structured (16 compression ratio), and longer ignition time delay is provided, the catch fire uniformity of front mixed gas of enhanced burning.
Through check: under the EGR that a kind of method of improving Low Temperature Combustion of Diesel Engine carbon smoke exhaust and fuel economy of the present invention can realize in broadness leads the carbon smoke exhaust of diesel engine and fuel economy are remained in the good numerical value, realize fast low temperature clean combustion process of vast scale premix that the in-cylinder combustion reactant mixes full and uniform, abundant exhaust gas dilution.Fully exhaust gas dilution can the establishment discharged nitrous oxides, prolongs ignition time delay, increases premix right; Low compression ratio strong turbulence piston and little spray cone angle, flexible oil spout fuel oil injection strategy constantly are complementary, and further increase the mixed process of fuel oil and gas, guarantee that combustion reactant mixes full and uniform, suppress carbon smoke exhaust; The closed loop control of intake temperature, pressure, composition has strengthened the control accuracy of Combustion boundary conditions, has reduced the control difficulty of EGR; The piston of the less slit volume of new structure, in conjunction with the control of Combustion boundary conditions and secondary fuel injection, improved the rate of oxidation of HC and CO; Although the compression ratio reduction can cause the reduction of the thermal efficiency, the prolongation of delay period causes the increase of premixed combustion ratio, burning heat release center of gravity, combustion duration to be optimized, and fuel economy is necessarily improved.Spray policy control, air manager system control, air-fuel mixture control (combination of low compression ratio strong turbulence firing chamber and Injection strategy) by above-mentioned fuel oil, the required mixture strength of different operating modes and temperature distribution state have been obtained, realize the high-efficiency cleaning low-temperature burning, state's 5 Abgasgesetzs are satisfied in original discharging in its noxious pollutant cylinder, and after installing simple diesel oxidation catalyst and particle supplementary set device additional, can satisfy Europe 6 Abgasgesetzs, Diesel Engine Fuel Economy improves 2.5%-5% simultaneously.
Fig. 4 and Fig. 5 are on engine device of the present invention, use a kind of concrete test result that obtains after Low Temperature Combustion of Diesel Engine carbon smoke exhaust and the fuel economy method of improving of the present invention.Fig. 4 adopts the carbon smoke exhaust data that gather behind the low compression ratio strong turbulence piston of the present invention, show among the figure, adopt newly-designed low compression ratio piston after, carbon smoke exhaust obviously reduces, further combined with the control (retarded injection constantly) of Injection strategy, elimination soot peak region.Fig. 5 is soot, the NO that obtains after using two-step supercharging, high EGR to lead, control in conjunction with low compression ratio piston, Injection strategy
x, HC, CO and indication oil consumption figure.Show among the figure, by Integrated using air manager system, Injection strategy control system and newly-designed low compression ratio piston, the present invention can make motor bear more a high proportion of EGR(to reach 55%) and do not cause the deterioration of soot, HC, CO and fuel economy, reduced the control difficulty that EGR leads, the fine Low Temperature Combustion of Diesel Engine carbon smoke exhaust that reduced has improved fuel economy.Fig. 5-2 is the local coordinate amplification effect of Fig. 5-1, and what dotted line was indicated is state's 5 emission limits, and wherein limit value requirement, NO are satisfied in HC, CO discharging
xFar below Europe 6 emission limits, granular material discharged also possess the state's of satisfying 5 emission request potentiality (representing as particulate matter with soot), compares with the low pressure charging operating mode, and fuel economy improves 2.5% under the high pressure-charging operating mode.Fig. 5-1 and 5-2 are a working condition measurement point of practical application, according to controlling method of the present invention, can realize good effulent and fuel economy test result under other operating modes.At last, use controlling method of the present invention, according to after the emission test rules tests, original discharging can be satisfied state's 5 Abgasgesetzs in the noxious pollutant cylinder of motor of the present invention, and after installing oxidation catalyzer and grain catcher additional, can satisfy Europe 6 Abgasgesetzs, Diesel Engine Fuel Economy improves 2.5%-5% simultaneously.
(1) control unit reads respectively the tach signal that is installed in the sensor on the engine crankshaft, the engine load signal that is installed in the sensor on the gas pedal and judges load and the rotating speed operating mode of motor operation according to described tach signal and engine load signal; The compression ratio of cylinder is controlled at 16, and piston ring groove is 4mm apart from apical side height.The reentrant diameter of the piston of cylinder is 65.6mm, and the piston crater degree of depth is 18.8mm, and piston crater circular arc place radius is 6mm, and reentrant diameter is 62.5% with the cylinder bore ratio, and pit depth is 17.9% with the cylinder bore ratio.
(2) if the judged result in the step (1) is middle-low load working condition, the inlet air conditions controller is according to the intake temperature parameter that reads output control signal, and controlling method is as follows: reduce high pressure stage in high pressure stage and the low pressure stage exhaust gas recirculation circuit and the aperture of low pressure stage cooler for recycled exhaust gas aperture and upper first, second grade intercooler of intake manifold; Simultaneously electronic control unit control spray cone angle is that the oil spout of the little spray-cone angle oil sprayers of 140 degree is the budc 0-10 Shaft angle of writing music constantly;
(3) if the judged result in the step (1) is high load working condition, the inlet air conditions controller is according to the intake temperature parameter output control signal that reads, and controlling method is as follows: the high pressure stage in increase high pressure stage and the low pressure stage exhaust gas recirculation circuit and the aperture of low pressure stage cooler for recycled exhaust gas aperture and upper the first second level intercooler of intake manifold; The simultaneously electronic control unit oil spout first time of controlling little spray-cone angle oil sprayer is the budc 10-20 Shaft angle of writing music constantly, and the oil spout second time is the atdc 0-26 Shaft angle of writing music constantly;
(4) if the judged result in the step (1) is the middle and slow speed of revolution operating mode, the inlet air conditions controller is according to the suction pressure parameter that reads, the output control signal, controlling method is as follows: turn or close the automatically controlled bypass valve aperture that is installed in the other adapter of engine exhaust down, the inlet air conditions controller is according to the running parameter of loading under the air inlet oxygen concentration parameter that reads and the middle and slow speed of revolution operating mode simultaneously, send pulse command to high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve, the valve opening of regulating high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve makes ER EGR Rate remain on 40-55%, the part exhausting waste gas of discharging through the exhaust valve of the cylinder this moment high pressure stage cooler for recycled exhaust gas of flowing through, the outlet that one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor forms the high pressure stage exhaust gas recirculation circuit; Flow through high-pressure turbine stage or directly enter the suction port that low pressure stage turbo machine, grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter the low pressure stage gas compressor by automatically controlled bypass valve of another part exhausting waste gas forms the low pressure stage exhaust gas recirculation circuit; The mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms is together through the compression of low pressure stage gas compressor, and the first order of then flowing through intercooler cools off to increase air density, increases air inflow; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and further compresses, and then the waste gas with process high pressure stage exhaust gas recirculation circuit further cools off through second level intercooler again, enters cylinder finally by the intake manifold;
(5) if the judged result in the step (1) is high rotating speed operating mode, the inlet air conditions controller is according to the suction pressure parameter that reads, the output control signal, controlling method is as follows: heighten or the automatically controlled bypass valve aperture of complete opening installation in the other adapter of engine exhaust, the inlet air conditions controller is according to the running parameter of loading under the air inlet oxygen concentration parameter that reads and the high rotating speed operating mode simultaneously, send pulse command to high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve, the valve opening of regulating high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve makes ER EGR Rate remain on 40-55%, the part exhausting waste gas of discharging through the exhaust valve of the cylinder this moment high pressure stage cooler for recycled exhaust gas of flowing through, the outlet that one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor forms the high pressure stage exhaust gas recirculation circuit; Flow through high-pressure turbine stage or directly enter the suction port that low pressure stage turbo machine, grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter the low pressure stage gas compressor by automatically controlled bypass valve of another part exhausting waste gas forms the low pressure stage exhaust gas recirculation circuit; The mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms is together through the compression of low pressure stage gas compressor, and the first order of then flowing through intercooler cools off to increase air density, increases air inflow; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and further compresses, and then the waste gas with process high pressure stage exhaust gas recirculation circuit further cools off through second level intercooler again, enters cylinder finally by the intake manifold.
After tested: use controlling method of the present invention, the fine target that has realized that carbon smoke exhaust reduces, fuel economy improves under the EGR condition at high proportion.After the test of emission test rules, original discharging (namely in the situation that without preprocessor) can be satisfied state's 5 emission regulation demands in the noxious pollutant cylinder of motor of the present invention, and after installing oxidation catalyzer and grain catcher additional, can satisfy Europe 6 Abgasgesetzs, Diesel Engine Fuel Economy improves 2.5%-5% simultaneously.
Claims (2)
1. one kind is improved Low Temperature Combustion of Diesel Engine carbon smoke exhaust and fuel economy method, it is characterized in that it may further comprise the steps:
(1) control unit reads respectively the tach signal that is installed in the sensor on the engine crankshaft, the engine load signal that is installed in the sensor on the gas pedal and judges load and the rotating speed operating mode of motor operation according to described tach signal and engine load signal;
(2) if the judged result in the step (1) is middle-low load working condition, the inlet air conditions controller is according to the intake temperature parameter that reads output control signal, and controlling method is as follows: reduce high pressure stage in high pressure stage and the low pressure stage exhaust gas recirculation circuit and the aperture of low pressure stage cooler for recycled exhaust gas aperture and upper first, second grade intercooler of intake manifold; Simultaneously electronic control unit control spray cone angle is that the oil spout of the little spray-cone angle oil sprayers of 140 degree is the budc 0-10 Shaft angle of writing music constantly;
(3) if the judged result in the step (1) is high load working condition, the inlet air conditions controller is according to the intake temperature parameter output control signal that reads, and controlling method is as follows: the aperture of upper first, second grade intercooler of the high pressure stage in increase high pressure stage and the low pressure stage exhaust gas recirculation circuit and low pressure stage cooler for recycled exhaust gas aperture and intake manifold; The simultaneously electronic control unit oil spout first time of controlling little spray-cone angle oil sprayer is the budc 10-20 Shaft angle of writing music constantly, and the oil spout second time is the atdc 0-26 Shaft angle of writing music constantly;
(4) if the judged result in the step (1) is the middle and slow speed of revolution operating mode, the inlet air conditions controller is according to the suction pressure parameter that reads, the output control signal, controlling method is as follows: turn or close the automatically controlled bypass valve aperture that is installed in the other adapter of engine exhaust down, the inlet air conditions controller is according to the running parameter of loading under the air inlet oxygen concentration parameter that reads and the middle and slow speed of revolution operating mode simultaneously, send pulse command to high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve, the valve opening of regulating high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve makes ER EGR Rate remain on 40%-55%, the part exhausting waste gas of discharging through the exhaust valve of the cylinder this moment high pressure stage cooler for recycled exhaust gas of flowing through, the outlet that one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor forms the high pressure stage exhaust gas recirculation circuit; Flow through high-pressure turbine stage or directly enter the suction port that low pressure stage turbo machine, grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter the low pressure stage gas compressor by automatically controlled bypass valve of another part exhausting waste gas forms the low pressure stage exhaust gas recirculation circuit; The mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms is together through the compression of low pressure stage gas compressor, and the first order of then flowing through intercooler cools off to increase air density, increases air inflow; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and further compresses, and then the waste gas with process high pressure stage exhaust gas recirculation circuit further cools off through second level intercooler again, enters cylinder finally by the intake manifold;
(5) if the judged result in the step (1) is high rotating speed operating mode, the inlet air conditions controller is according to the suction pressure parameter that reads, the output control signal, controlling method is as follows: heighten or the automatically controlled bypass valve aperture of complete opening installation in the other adapter of engine exhaust, the inlet air conditions controller is according to the running parameter of loading under the air inlet oxygen concentration parameter that reads and the high rotating speed operating mode simultaneously, send pulse command to high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve, the valve opening of regulating high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve makes ER EGR Rate remain on 40%-55%, the part exhausting waste gas of discharging through the exhaust valve of the cylinder this moment high pressure stage cooler for recycled exhaust gas of flowing through, the outlet that one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor forms the high pressure stage exhaust gas recirculation circuit; Flow through high-pressure turbine stage or directly enter the suction port that low pressure stage turbo machine, grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter the low pressure stage gas compressor by automatically controlled bypass valve of another part exhausting waste gas forms the low pressure stage exhaust gas recirculation circuit; The mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms is together through the compression of low pressure stage gas compressor, and the first order of then flowing through intercooler cools off to increase air density, increases air inflow; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and further compresses, and then the waste gas with process high pressure stage exhaust gas recirculation circuit further cools off through second level intercooler again, enters cylinder finally by the intake manifold.
2. Low Temperature Combustion of Diesel Engine carbon smoke exhaust and the fuel economy method improved according to claim 1, it is characterized in that: the compression ratio of the cylinder of described step (1) to the step (5) is 16, the reentrant diameter of cylinder inner carrier is 65.6mm, reentrant diameter is 62.5% with the cylinder bore ratio, the piston crater degree of depth is 18.8mm, pit depth is 17.9% with the cylinder bore ratio, and piston crater circular arc place radius is 6mm, and piston ring groove is 4mm apart from apical side height.
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