CN102889147B - High-efficiency and low-emission novel composite thermodynamic cycle control method for engine - Google Patents
High-efficiency and low-emission novel composite thermodynamic cycle control method for engine Download PDFInfo
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- CN102889147B CN102889147B CN201210366189.7A CN201210366189A CN102889147B CN 102889147 B CN102889147 B CN 102889147B CN 201210366189 A CN201210366189 A CN 201210366189A CN 102889147 B CN102889147 B CN 102889147B
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Abstract
The invention discloses a high-efficiency and low-emission novel composite thermodynamic cycle control method for an engine. The control method comprises the following steps that: (1) a control unit respectively reads a rotating speed signal of a sensor arranged on an engine crank and an engine load signal of a sensor arranged on an accelerator pedal and judges a load and a rotating speed working condition during running of the engine according to the rotating speed signal and the engine load signal; (2) if the rotating speed working condition is a low-mid rotating speed working condition, the control unit sends a switch off signal to an electric control bypass valve arranged on an engine exhaust bypass pipe, and a medium-pressure grade waste gas recycling valve and a low-pressure grade waste gas recycling valve are opened; and (3) if the rotating speed working condition is a high rotating speed working condition, the control unit sends a switch on signal to the electric control bypass valve arranged on the engine exhaust bypass pipe. By the method, the boosting power and the low speed torque of the engine are greatly improved.
Description
Technical field
The present invention relates to field of internal combustion engine, the controlling method of particularly a kind of engine high-efficiency low emission NEW TYPE OF COMPOSITE thermodynamic cycle.
Background technique
Internal-combustion engine is the main power source of communications and transportation, engineering and farm machinery equal power device, and the internal-combustion engine crude oil in China external dependence degree in more than 60%, 2011 accounting for China's oil total flow that consume petroleum reach 56.5%.By technological innovation, increasing substantially internal combustion engine thermal efficiency is the great demand guaranteeing national energy security.Meanwhile, at the CO that mankind's activity causes
2in discharge, be that the communications and transportation of power accounts for 25% with internal-combustion engine.Improving internal combustion engine thermal efficiency is reduce CO
2one of main battle ground of discharge.The nitrogen oxide of current vehicular emission, volatile organic matter and the share rate of pellet in Surveying of Urban Air Pollution Sources reach 66%, 90% and 26% respectively, vehicular emission is also one of maximum " contribution " person of PM2.5, accounts for 22.2%(Beijing that total PM2.5 discharges respectively) and 25%(Shanghai).Reduce car combustion engine noxious emission, improve atmosphere environment especially city atmospheric environment be the major issue that Chinese society economic development must solve.
In recent years, the new energy power technology being representative with electric vehicle, fuel cell car etc. obtains the great attention of countries in the world government and motor corporation.But international automobile academia and industrial quarters are recognized clear-headedly: the short-term great-leap-forward development of similar electronics and information industry can not occur automobile industry.Therefore, the universal of new-energy automobile will be a very long process, and if there is no certain recoverable amount, it will be very limited to the actual effect of energy security, climatic change and atmosphere environment.
Based on internal-combustion engine in the important function ensureing energy security, reply Global climate change and reduction air environmental pollution, combustion engine energy-saving emission reduction work, while greatly developing new energy power technology, is attached great importance in countries in the world.Since entering the new century, automobile developed country supports all energetically with the research of " homogeneous compression-ignition, low-temperature burning " the combustion in IC engine theory and technology of new generation that is representative.Two 973 planning items that China also organizes at Department of Science and Technology 2001-2011 have carried out relevant research work, and achieve impressive progress.Prove that applying combustion in IC engine technology of new generation can improve internal combustion engine thermal efficiency simultaneously, reduce CO
2discharge, reduces noxious emission in exhaust gases of internal combustion engines.Due to the clean burning of motor, decrease the dependence to preprocessor, tentatively achieve the target of energy saving, resources and environment close friend.
But, in the research of advanced " homogeneous compression-ignition, low-temperature burning " technology, all encounter both at home and abroad a new technical bottleneck, namely under motor height rotating speed, high load, high power density, five contradictions being difficult to coordinate are there are, i.e. the contradiction of high charge pressure and engine strength, limited incorporation time and the contradiction suppressing the contradiction of the contradiction of the contradiction of soot, low oxygen concentration (high EGR rate) and low oxygen content, low reaction rate and high thermal efficiency, the thermal efficiency and noxious emission to control.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art, a kind of transformation efficiency of the available energy/merit improved in internal combustion engine working process is provided, reduce the irreversible loss in mixed Daqu, compression, burning and expansion work process in cylinder, the final controlling method obtaining the engine high-efficiency low emission NEW TYPE OF COMPOSITE thermodynamic cycle of the engine combustion process of high-efficiency cleaning.
In order to achieve the above object, the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE of the present invention thermodynamic cycle, it comprises the following steps:
(1) control unit reads the tach signal of the sensor be arranged on engine crankshaft, the engine load signal of the sensor be arranged in gas pedal judge the load that motor runs and speed conditions according to described tach signal and engine load signal respectively;
(2) if the judged result in step (1) is middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to the automatically controlled bypass valve be arranged in the other adapter of engine exhaust, now medium pressure grade exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve are opened, the waste gas that cylinder is discharged expands through high-pressure turbine stage, portion exhaust stream through expanding enters the outlet of low pressure stage gas compressor through the second grain catcher, medium pressure grade cooler for recycled exhaust gas, the second one-way valve and medium pressure grade exhaust gas recirculation valve, form medium pressure grade exhaust gas recirculation circuit; The exhausting waste gas of another part through expanding flows through lower pressure stage turbines and expands further, then entered the suction port of low pressure stage gas compressor successively by the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve, form low pressure stage exhaust gas recirculation circuit; Air inlet and being compressed through low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit, then forms mixed gas and flows through first order intercooler again and cool with the waste gas through medium pressure grade exhaust gas recirculation circuit; Mixed gas through the cooling of first order intercooler enters high pressure stage gas compressor and compresses further, is then further cooled through second level intercooler, enters cylinder finally by intake manifold;
(3) if the judged result in step (1) is high speed conditions, then described control unit sends opening signal to the automatically controlled bypass valve be arranged in the other adapter of engine exhaust, portion exhaust is directly discharged after lower pressure stage turbines expands, now high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve are opened, the exhausting waste gas that part cylinder is discharged flows through the outlet that high pressure stage cooler for recycled exhaust gas, the first one-way valve and high pressure stage exhaust gas recirculation valve enter high pressure stage gas compressor, forms high pressure stage exhaust gas recirculation circuit; Another part exhausting waste gas enters the suction port of low pressure stage gas compressor after lower pressure stage turbines expands by the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve, form low pressure stage exhaust gas recirculation circuit; Air inlet and compressing through low pressure stage gas compressor together through the mixed gas that the waste gas of low pressure stage exhaust gas recirculation circuit is formed, mixed gas after compression enters high pressure stage gas compressor and compresses further after the cooling of first order intercooler, then cool further through second level intercooler together with the waste gas through high pressure stage exhaust gas recirculation circuit, enter cylinder finally by intake manifold;
(4) if the judged result in step (1) is middle small load condition, then described control unit sends exhaust valve early OFF signal to the variable exhaust mechanism of installing on the engine, forms internal exhaust gas recirculation;
(5) if the judged result in step (1) is high load working condition, then described control unit sends intake valve OFF signal in evening to the variable air inlet mechanism installed on the engine, forms miller cycle.
Compared with prior art, the present invention has following four aspect advantages:
The first, by using the two-stage brayton cycle process of band composite exhaust gas recirculation, the transient response characteristic of motor can be improved, and in the scope that structural strength allows, increase substantially HP, hp/litre and low speed torque.Combinationally using of three grades of composite exhaust gas recirculation can demand to exhausted air quantity under the different operating mode of free adjusting, effectively reduces NOx emission.Two-step supercharging can increase substantially air inflow, improves EGR ability to bear, improves the empty equivalent proportion of combustion, reduces carbon smoke exhaust.Thus on the basis of improving engine power performance, reduce pollutant emission.
The second, by using variable air inlet mechanism to regulate air inlet compression finishing temperature and pressure, controlling combustion heat release moment subsequently and heat release center of gravity: firing pressure is improved, increasing Effective power area, reduce burning heat transfer loss; By using variable exhaust mechanism to regulate exhaust finishing temperature and pressure, control exhaust energy, internal exhaust gas recirculation rate and expansion work ability.Utilize the miller cycle process that variable intake and exhaust mechanism forms simultaneously, change diesel engine effective compression ratio, form the miller cycle process that compression ratio is less than expansion ratio, improve engine thermal efficiency.
3rd, by the maximization optimizing process for engine exhaust energy utilization ratio, make exhaust energy reasonable layout in the exhaust energy, Rankine cycle etc. of inside and outside EGR, driving turbine, effectively utilize exhaust energy, reduce engine exhaust thermal loss.
4th, circulate at the Otto (Otto) that internal-combustion engine is traditional and in Diesel (Diesel) circulation, increase two-stage brayton cycle and the miller cycle of band EGR, Collaborative Control is carried out to compound thermodynamic cycle process within the scope of motor full working scope.And based on the first law of thermodynamics and second law, the acting ability of engine combustion heat is improved under the condition reducing heat transfer loss and exhaust gas heat loss, the engine optimization Controlling model making internal combustion engine thermal efficiency reach the highest is proposed, make hot working fluid mechanical state in cylinder be in the minimum balance of irreversible loss " ultimate state (extreme state) " in real time, under making motor meet the prerequisite of power character and emission performance requirement, the thermal efficiency improves 10%-15% on existing basis.
Accompanying drawing explanation
Fig. 1 is the system schematic of engine high-efficiency low emission NEW TYPE OF COMPOSITE thermodynamic cycle implementation method of the present invention and device thereof;
Fig. 2 is control principle schematic diagram of the present invention;
Fig. 3 is control logic schematic diagram of the present invention.
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments.
The inventive method carries out hierarchy optimization for engine speed and the changeable feature of load, and then to be structured in based on the first law of thermodynamics and second law reduce heat transfer loss and exhaust gas heat loss condition under improve the optimizing control models of the acting ability of engine combustion heat, improve the transformation efficiency of the available energy/merit in internal combustion engine working process, reduce the irreversible loss in mixed Daqu, compression, burning and expansion work process in cylinder, the final engine combustion process obtaining high-efficiency cleaning.
As shown in Figure 1 and Figure 2, the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE of the present invention thermodynamic cycle, it comprises the following steps: (1) control unit reads the tach signal of the sensor be arranged on engine crankshaft, the engine load signal of the sensor be arranged in gas pedal judge the load that motor runs and speed conditions according to described tach signal and engine load signal respectively, (2) if the judged result in step (1) is middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to the automatically controlled bypass valve 8 be arranged in the other adapter of engine exhaust, now medium pressure grade exhaust gas recirculation valve 18 and low pressure stage exhaust gas recirculation valve 20 are opened (in middle and slow speed of revolution operating mode, exhaust energy is lower, between exhaust back pressure and suction pressure, pressure reduction is less), the waste gas that cylinder is discharged expands through high-pressure turbine stage 4, portion exhaust stream through expanding is through the second grain catcher 15, medium pressure grade cooler for recycled exhaust gas 16, second one-way valve 17 and medium pressure grade exhaust gas recirculation valve 18 enter the outlet of low pressure stage gas compressor 7, form medium pressure grade exhaust gas recirculation circuit, the exhausting waste gas of another part through expanding flows through lower pressure stage turbines 6 and expands further, then the suction port of low pressure stage gas compressor 7 is entered successively by the first grain catcher 11, low pressure stage cooler for recycled exhaust gas 19 and low pressure stage exhaust gas recirculation valve 20, form low pressure stage exhaust gas recirculation circuit, thus to the demand of vast scale EGR under meeting middle and slow speed of revolution, air inlet and being compressed through low pressure stage gas compressor 7 together through the waste gas of low pressure stage exhaust gas recirculation circuit, then forms mixed gas and flows through first order intercooler 9 again and cool to increase air density, increase air inflow with the waste gas through medium pressure grade exhaust gas recirculation circuit, mixed gas through first order intercooler 9 cooling enters high pressure stage gas compressor 5 and compresses further, is then further cooled through second level intercooler 10, enters cylinder 1 finally by intake manifold.(3) if the judged result in step (1) is high speed conditions, then described control unit sends opening signal to the automatically controlled bypass valve 8 be arranged in the other adapter of engine exhaust, portion, without high-pressure turbine stage 4, is directly discharged (make air inlet pressure than the upper limit (UL) being unlikely to reach setting, optimize the distribution of high low pressure stage turbine exhaust energy) after lower pressure stage turbines 6 expands.Now high pressure stage exhaust gas recirculation valve 14 and low pressure stage exhaust gas recirculation valve 20 are opened (at high speed conditions, exhaust energy is larger, between exhaust back pressure and suction pressure, pressure reduction is larger), the waste gas streams that part cylinder is discharged enters the outlet of high pressure stage gas compressor 5 through high pressure stage cooler for recycled exhaust gas 12, first one-way valve 13 and high pressure stage exhaust gas recirculation valve 14, form high pressure stage exhaust gas recirculation circuit; Another part exhausting waste gas enters the suction port of low pressure stage gas compressor 7 after lower pressure stage turbines 6 expands by the first grain catcher 11, low pressure stage cooler for recycled exhaust gas 19 and low pressure stage exhaust gas recirculation valve 20, form low pressure stage exhaust gas recirculation circuit, thus the demand to vast scale EGR under meeting high rotating speed; Air inlet and compressing through low pressure stage gas compressor 7 together through the mixed gas that the waste gas of low pressure stage exhaust gas recirculation circuit is formed, then cools to increase air density, increase air inflow through first order intercooler 9; Enter high pressure stage gas compressor 5 through the cooled mixed gas of first order intercooler 9 to be further compressed, be then further cooled through second level intercooler 10 together with the waste gas through high pressure stage exhaust gas recirculation circuit, enter cylinder 1 finally by intake manifold.(4) if the judged result in step (1) is middle small load condition, then described control unit sends exhaust valve early OFF signal to the variable exhaust mechanism 3 of installing on the engine, form internal exhaust gas recirculation, ensure that low-temperature burning is at Smaller load stable ignition; Simultaneously because exhaust energy under middle small load condition is lower, main supply internal exhaust gas recirculation uses with driving high-pressure turbine stage 4 and lower pressure stage turbines 6; (5) if the judged result in step (1) is high load working condition, then described control unit sends intake valve OFF signal in evening to the variable air inlet mechanism 2 installed on the engine, compression temperature and pressure and combustion heat release process subsequently in control cylinder, thus improve firing pressure, increase Effective power area, reduce burning heat transfer loss; The adjustment of variable air inlet mechanism 2, can change diesel engine effective compression ratio, forms the miller cycle process that compression ratio is less than expansion ratio, improves engine thermal efficiency.Under high load operating mode, exhaust energy is higher, exhaust energy mainly drives high-pressure turbine stage 4 and lower pressure stage turbines 6 to do work, simultaneously for follow-up heat exchanger 21, decompressor 22, condenser 23, reflux pump 24 form Rankine cycle and reclaim the annex acting uses such as wasted energy driving air-conditioning.
As shown in Figure 3, control logic of the present invention is as follows: during Otto (Otto) circulation traditional for motor and Diesel (Diesel) are circulated, increase the two-stage brayton cycle of band EGR, miller cycle and Rankine cycle, Collaborative Control is carried out to compound thermodynamic cycle process within the scope of motor full working scope.Within the scope of full working scope, control strategy is based on the first law of thermodynamics and second law, the acting ability of engine combustion heat is improved under the condition reducing heat transfer loss and exhaust gas heat loss, make hot working fluid mechanical state in cylinder be in the minimum balance of irreversible loss " ultimate state " in real time, form the NEW TYPE OF COMPOSITE thermodynamic cycle Optimized model and combustion control theme that meet minimum discharge requirement and maximization effective thermal efficiency in cylinder.
Through inspection: the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE of the present invention thermodynamic cycle can realize the weak mixture low-temperature burning process fast of full and uniform, the abundant dilution of in-cylinder combustion reactant mixing.Abundant dilution (raising adiabatic index) can improve working medium acting ability, and rapid combustion makes thermodynamic cycle close to desirable constant volume cycle, and low-temperature burning can reduce heat transfer loss, and reduces exhaust heat.Maximization optimizing process for engine exhaust energy utilization ratio makes exhaust energy reasonable layout in the exhaust energy, Rankine cycle etc. of inside and outside EGR, driving turbine, effectively utilizes exhaust energy, optimizes further and improve engine thermal efficiency.Collaborative Control eventually through available energy/merit transformation efficiency maximization and the thermodynamic cycle of novel changable compound makes motor effective thermal efficiency improve 10%-15%, in noxious pollutant cylinder, raw emissions meets Europe 5 Abgasgesetz, and after installing preprocessor additional, meet Europe 6 Abgasgesetz.
Embodiment 1
(1) control unit reads the tach signal of the sensor be arranged on engine crankshaft, the engine load signal of the sensor be arranged in gas pedal judge the load that motor runs and speed conditions according to described tach signal and engine load signal respectively;
(2) if the judged result in step (1) is middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to the automatically controlled bypass valve be arranged in the other adapter of engine exhaust, exhausting waste gas is through high-pressure turbine stage, lower pressure stage turbines expands successively, now medium pressure grade exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve are opened, portion exhaust stream enters the outlet of low pressure stage gas compressor through the second grain catcher, medium pressure grade cooler for recycled exhaust gas, the second one-way valve and medium pressure grade exhaust gas recirculation valve, forms medium pressure grade exhaust gas recirculation circuit; Another part exhausting waste gas flows through the suction port that the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter low pressure stage gas compressor, form low pressure stage exhaust gas recirculation circuit, thus to the demand of vast scale EGR under meeting middle and slow speed of revolution; Air inlet and being compressed through low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit, then flows through first order intercooler cooled to increase air density, to increase air inflow again with the waste gas through medium pressure grade exhaust gas recirculation circuit; After first order intercooler, mixed gas enters high pressure stage gas compressor and is further compressed, and is then further cooled through second level intercooler, enters cylinder finally by intake manifold;
(3) if the judged result in step (1) is high speed conditions, then described control unit sends opening signal to the automatically controlled bypass valve be arranged in the other adapter of engine exhaust, portion exhaust is directly discharged after lower pressure stage turbines expands, now high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve are opened, portion exhaust stream enters the outlet of high pressure stage gas compressor through high pressure stage cooler for recycled exhaust gas, the first one-way valve and high pressure stage exhaust gas recirculation valve, forms high pressure stage exhaust gas recirculation circuit; Another part exhausting waste gas flows through the suction port that the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter low pressure stage gas compressor, forms low pressure stage exhaust gas recirculation circuit; Air inlet and being compressed through low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit, is then cooled through first order intercooler; After first order intercooler, mixed gas enters high pressure stage gas compressor and is further compressed, and is then further cooled through second level intercooler together with the waste gas through high pressure stage exhaust gas recirculation circuit, enters cylinder finally by intake manifold;
(4) if the judged result in step (1) is middle small load condition, then described control unit sends exhaust valve early OFF signal to the variable exhaust mechanism of installing on the engine, forms internal exhaust gas recirculation;
(5) if the judged result in step (1) is high load working condition, then described control unit sends intake valve OFF signal in evening to the variable air inlet mechanism installed on the engine, forms miller cycle.
Through inspection: the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE of the present invention thermodynamic cycle can realize the weak mixture low-temperature burning process fast of full and uniform, the abundant dilution of in-cylinder combustion reactant mixing.Abundant dilution (raising adiabatic index) can improve working medium acting ability, and rapid combustion makes thermodynamic cycle close to desirable constant volume cycle, and low-temperature burning can reduce heat transfer loss, and reduces exhaust heat.Make motor effective thermal efficiency improve 10%, in noxious pollutant cylinder, raw emissions meets Europe 5 Abgasgesetz, and after installing preprocessor additional, meet Europe 6 Abgasgesetz.
Embodiment 2
(1) control unit reads the tach signal of the sensor be arranged on engine crankshaft, the engine load signal of the sensor be arranged in gas pedal judge the load that motor runs and speed conditions according to described tach signal and engine load signal respectively;
(2) if the judged result in step (1) is middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to the automatically controlled bypass valve be arranged in the other adapter of engine exhaust, exhausting waste gas is through high-pressure turbine stage, lower pressure stage turbines expands successively, now medium pressure grade exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve are opened, portion exhaust stream enters the outlet of low pressure stage gas compressor through the second grain catcher, medium pressure grade cooler for recycled exhaust gas, the second one-way valve and medium pressure grade exhaust gas recirculation valve, forms medium pressure grade exhaust gas recirculation circuit; Another part exhausting waste gas flows through the suction port that the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter low pressure stage gas compressor, form low pressure stage exhaust gas recirculation circuit, thus to the demand of vast scale EGR under meeting middle and slow speed of revolution; Air inlet and being compressed through low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit, then flows through first order intercooler cooled to increase air density, to increase air inflow again with the waste gas through medium pressure grade exhaust gas recirculation circuit; After first order intercooler, mixed gas enters high pressure stage gas compressor and is further compressed, and is then further cooled through second level intercooler, enters cylinder finally by intake manifold;
(3) if the judged result in step (1) is high speed conditions, then described control unit sends opening signal to the automatically controlled bypass valve be arranged in the other adapter of engine exhaust, portion exhaust is directly discharged after lower pressure stage turbines expands, now high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve are opened, portion exhaust stream enters the outlet of high pressure stage gas compressor through high pressure stage cooler for recycled exhaust gas, the first one-way valve and high pressure stage exhaust gas recirculation valve, forms high pressure stage exhaust gas recirculation circuit; Another part exhausting waste gas flows through the suction port that the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve enter low pressure stage gas compressor, forms low pressure stage exhaust gas recirculation circuit; Air inlet and being compressed through low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit, is then cooled through first order intercooler; After first order intercooler, mixed gas enters high pressure stage gas compressor and is further compressed, and is then further cooled through second level intercooler together with the waste gas through high pressure stage exhaust gas recirculation circuit, enters cylinder finally by intake manifold;
(4) if the judged result in step (1) is middle small load condition, then described control unit sends exhaust valve early OFF signal to the variable exhaust mechanism of installing on the engine, forms internal exhaust gas recirculation;
(5) if the judged result in step (1) is high load working condition, then described control unit sends intake valve OFF signal in evening to the variable air inlet mechanism installed on the engine, forms miller cycle; In addition described control unit sends signal to the variable exhaust mechanism of installing on the engine, stop internal exhaust gas recirculation, portion through heat exchanger, decompressor, condenser, reflux pump composition Rankine cycle, to more than exhaust energy reclaim, improve engine thermal efficiency further.
Through inspection: the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE of the present invention thermodynamic cycle can realize the weak mixture low-temperature burning process fast of full and uniform, the abundant dilution of in-cylinder combustion reactant mixing.Abundant dilution (raising adiabatic index) can improve working medium acting ability, and rapid combustion makes thermodynamic cycle close to desirable constant volume cycle, and low-temperature burning can reduce heat transfer loss, and reduces exhaust heat.The increase of Rankine cycle makes waste heat energy regenerating effectively be reclaimed, and reduces exhaust energy loss further.Thus making motor effective thermal efficiency improve 15%, in noxious pollutant cylinder, raw emissions meets Europe 5 Abgasgesetz, and after installing preprocessor additional, meet Europe 6 Abgasgesetz.
Claims (1)
1. the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE thermodynamic cycle, is characterized in that it comprises the following steps:
(1) control unit reads the tach signal of the sensor be arranged on engine crankshaft, the engine load signal of the sensor be arranged in gas pedal judge the load that motor runs and speed conditions according to described tach signal and engine load signal respectively;
(2) if the judged result in step (1) is middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to the automatically controlled bypass valve be arranged in the other adapter of engine exhaust, now medium pressure grade exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve are opened, the waste gas that cylinder is discharged expands through high-pressure turbine stage, portion exhaust stream through expanding enters the outlet of low pressure stage gas compressor through the second grain catcher, medium pressure grade cooler for recycled exhaust gas, the second one-way valve and medium pressure grade exhaust gas recirculation valve, form medium pressure grade exhaust gas recirculation circuit; The exhausting waste gas of another part through expanding flows through lower pressure stage turbines and expands further, then entered the suction port of low pressure stage gas compressor successively by the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve, form low pressure stage exhaust gas recirculation circuit; Air inlet and being compressed through low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit, then forms mixed gas and flows through first order intercooler again and cool with the waste gas through medium pressure grade exhaust gas recirculation circuit; Mixed gas through the cooling of first order intercooler enters high pressure stage gas compressor and compresses further, is then further cooled through second level intercooler, enters cylinder finally by intake manifold;
(3) if the judged result in step (1) is high speed conditions, then described control unit sends opening signal to the automatically controlled bypass valve be arranged in the other adapter of engine exhaust, portion exhaust is directly discharged after lower pressure stage turbines expands, now high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve are opened, the exhausting waste gas that part cylinder is discharged flows through the outlet that high pressure stage cooler for recycled exhaust gas, the first one-way valve and high pressure stage exhaust gas recirculation valve enter high pressure stage gas compressor, forms high pressure stage exhaust gas recirculation circuit; Another part exhausting waste gas enters the suction port of low pressure stage gas compressor after lower pressure stage turbines expands by the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve, form low pressure stage exhaust gas recirculation circuit; Air inlet and compressing through low pressure stage gas compressor together through the mixed gas that the waste gas of low pressure stage exhaust gas recirculation circuit is formed, mixed gas after compression enters high pressure stage gas compressor and compresses further after the cooling of first order intercooler, then cool further through second level intercooler together with the waste gas through high pressure stage exhaust gas recirculation circuit, enter cylinder finally by intake manifold;
(4) if the judged result in step (1) is middle small load condition, then described control unit sends exhaust valve early OFF signal to the variable exhaust mechanism of installing on the engine, forms internal exhaust gas recirculation;
(5) if the judged result in step (1) is high load working condition, then described control unit sends intake valve OFF signal in evening to the variable air inlet mechanism installed on the engine, forms miller cycle.
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| DE102015013794A1 (en) * | 2015-10-22 | 2017-04-27 | Man Truck & Bus Ag | Method for operating an internal combustion engine, in particular a diesel engine |
| CN106762294B (en) * | 2016-11-22 | 2019-03-05 | 天津大学 | A kind of method of flexible control engine combustion mode |
| CN110206641B (en) * | 2019-04-29 | 2021-04-02 | 天津大学 | Compression ignition engine and method for realizing low-temperature combustion mode thereof |
| CN112196682B (en) * | 2020-10-15 | 2022-09-23 | 潍柴动力股份有限公司 | Method and device for controlling an exhaust gas recirculation valve |
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