CN102889147A - 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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- CN102889147A CN102889147A CN2012103661897A CN201210366189A CN102889147A CN 102889147 A CN102889147 A CN 102889147A CN 2012103661897 A CN2012103661897 A CN 2012103661897A CN 201210366189 A CN201210366189 A CN 201210366189A CN 102889147 A CN102889147 A CN 102889147A
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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, particularly the controlling method of 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 internal-combustion engine consumes petroleum and accounts for more than 60% of China's oil total flow, and the external interdependency of crude oil in China had reached 56.5% in 2011.By technological innovation, increasing substantially internal combustion engine thermal efficiency is the great demand of guaranteeing national energy security.Simultaneously, the CO that causes in mankind's activity
2In the discharging, the communications and transportation take internal-combustion engine as power accounts for 25%.Improving internal combustion engine thermal efficiency is to reduce CO
2One of main battle ground of discharging.Nitrogen oxide, volatile organic matter and the pellet share rate in Surveying of Urban Air Pollution Sources of current mobility car discharging reaches respectively 66%, 90% and 26%, vehicular emission also is one of maximum " contribution " person of PM2.5, accounts for respectively 22.2%(Beijing of total PM2.5 discharging) and 25%(Shanghai).Reduce the car combustion engine noxious emission, improve atmosphere environment especially city atmospheric environment be the major issue that the Chinese society economic development must solve.
In recent years, obtain the great attention of countries in the world government and motor corporation take electric vehicle, fuel cell car etc. as the new energy power technology of representative.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 in automobile industry.Therefore, popularizing of new-energy automobile will be a very long process, and if do not have certain recoverable amount, its actual effect to energy security, climatic change and atmosphere environment will be very limited.
In the important function that ensures energy security, reply Global climate change and reduction air environmental pollution, the combustion engine energy-saving emission reduction work is attached great importance in countries in the world when greatly developing the new energy power technology based on internal-combustion engine.Entered since the new century, automobile developed country all supports the research of the combustion in IC engine theory and technology of new generation take " homogeneous compression-ignition, low-temperature burning " as representative energetically.China has also carried out relevant research work at two 973 planning items of the 2001-2011 of Department of Science and Technology tissue, and has obtained impressive progress.Proved that using combustion in IC engine technology of new generation can improve simultaneously internal combustion engine thermal efficiency, reduce CO
2Discharging reduces noxious emission in the exhaust gases of internal combustion engines.Because the clean burning of motor has reduced the dependence to preprocessor, tentatively realized energy saving, resources and environment close friend's target.
But, in the research of advanced " homogeneous compression-ignition, low-temperature burning " technology, all run into a new technical bottleneck both at home and abroad, namely under the high rotating speed of motor, high load, high power density, five contradictions that are difficult to coordinate have appearred, i.e. the contradiction controlled of the contradiction of high charge pressure and engine strength, limited incorporation time and the contradiction that suppresses soot, low oxygen concentration (high EGR leads) and the contradiction of low oxygen content, low reaction rate and contradiction, the thermal efficiency and the noxious emission of high thermal efficiency.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, a kind of transformation efficiency that improves the available energy/merit in the internal combustion engine working process is provided, reduce the irreversible loss in mixed gas formation in the cylinder, compression, burning and the expansion acting process, finally obtain the controlling method of 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 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 the middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to being installed in the automatically controlled bypass valve that engine exhaust is other to be taken over, this moment, medium pressure grade exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve were opened, the waste gas that cylinder is discharged expands through high-pressure turbine stage, through the part exhausting waste gas that the expands outlet that 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 enter the low pressure stage gas compressor of flowing through, form the medium pressure grade exhaust gas recirculation circuit; Another part further expands through the exhausting waste gas that the expands low pressure stage turbo machine of flowing through, then enter successively the suction port of low pressure stage gas compressor by the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve, form the low pressure stage exhaust gas recirculation circuit; Air inlet and compressed through the low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit is then with the first order intercooler cooling of flowing through again through the waste gas formation mixed gas of medium pressure grade exhaust gas recirculation circuit; Enter the high pressure stage gas compressor through the mixed gas of first order intercooler cooling and further compress, then be further cooled through second level intercooler, enter cylinder finally by the intake manifold;
(3) if the judged result in the step (1) is high rotating speed operating mode, then described control unit sends opening signal to being installed in the automatically controlled bypass valve that engine exhaust is other to be taken over, the part exhausting waste gas is directly discharged after the low pressure stage turbo machine expands, this moment, high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve were opened, the exhausting waste gas that the part cylinder the is discharged outlet that high pressure stage cooler for recycled exhaust gas, the first one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor of flowing through forms the high pressure stage exhaust gas recirculation circuit; Another part exhausting waste gas enters the suction port of low pressure stage gas compressor by the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve after the low pressure stage turbo machine expands, form 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 compresses through the low pressure stage gas compressor together, mixed gas after the compression enters the high pressure stage gas compressor and further compresses after the cooling of first order intercooler, then further cool off through second level intercooler with the waste gas through the high pressure stage exhaust gas recirculation circuit, enter cylinder finally by the intake manifold;
(4) if the judged result in the step (1) is middle small load condition, then described control unit sends exhaust valve and early closes signal to being installed in variable exhaust mechanism on the motor, forms internal exhaust gas recirculation;
(5) if the judged result in the step (1) is high load working condition, then described control unit sends intake valve pass in evening signal to the variable air inlet mechanism that is installed on the motor, forms miller cycle.
Compared with prior art, the present invention has following four aspect advantages:
The first, by the two-stage brayton cycle process of use with composite exhaust gas recirculation, the transient response characteristic of motor be can improve, and in the scope that structural strength allows, HP, hp/litre and low speed torque increased substantially.Being used in combination under can the free adjusting different operating modes the demand of exhausted air quantity of three grades of composite exhaust gas recirculation effectively reduced the NOx discharging.Two-step supercharging can increase substantially air inflow, improves the EGR ability to bear, improves the empty equivalent proportion of combustion, reduces carbon smoke exhaust.Thereby on the basis of improving engine power performance, reduce pollutant emission.
The second, regulate air inlet compression finishing temperature and pressure by using variable air inlet mechanism, the control burning heat release moment and heat release center of gravity subsequently: firing pressure is improved, increase effective merit area, reduce the 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 acting ability.The miller cycle process of utilizing simultaneously variable intake and exhaust mechanism to form changes the diesel engine effective compression ratio, forms compression ratio less than the miller cycle process of expansion ratio, improves engine thermal efficiency.
The 3rd, by the maximization optimizing process for the engine exhaust capacity usage ratio, make exhaust energy at aspect reasonable layouts such as inside and outside EGR, the exhaust energy that drives turbine, Rankine cycles, effectively utilize exhaust energy, reduce the engine exhaust thermal loss.
The 4th, in the traditional Otto of internal-combustion engine (Otto) circulation and Diesel (Diesel) circulation, increase two-stage brayton cycle and miller cycle with EGR, compound thermodynamic cycle process in the full condition range of motor is carried out Collaborative Control.And based on the first law of thermodynamics and second law, under the condition that reduces the loss of heat transfer loss and exhaust gas heat, improve the acting ability of engine combustion heat, proposition makes internal combustion engine thermal efficiency reach the highest engine optimization control model, make hot working fluid mechanical state in the cylinder be in real time the balance " ultimate state (extreme state) " of irreversible loss minimum, make motor satisfy that the thermal efficiency improves 10%-15% on existing basis under the prerequisite of power character and emission performance requirement.
Description of drawings
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 representation of the present invention;
Fig. 3 is control logic schematic representation of the present invention.
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments.
The inventive method is to carry out hierarchy optimization for engine speed and the changeable characteristics of load, and then be structured in the optimizing control models that improves the acting ability of engine combustion heat under the condition that reduces heat transfer loss and exhaust gas heat loss based on the first law of thermodynamics and second law, improve the transformation efficiency of the available energy/merit in the internal combustion engine working process, reduce the irreversible loss in mixed gas formation in the cylinder, compression, burning and the expansion acting process, finally obtain the engine combustion process of 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 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 the middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to being installed in the automatically controlled bypass valve 8 that engine exhaust is other to be taken over, this moment, medium pressure grade exhaust gas recirculation valve 18 and low pressure stage exhaust gas recirculation valve 20 were opened (in the middle and slow speed of revolution operating mode, exhaust energy is lower, pressure reduction is less between exhaust back pressure and the suction pressure), the waste gas that cylinder is discharged expands through high-pressure turbine stage 4, through the part exhausting waste gas that expands second grain catcher 15 of flowing through, medium pressure grade cooler for recycled exhaust gas 16, the outlet that the second one-way valve 17 and medium pressure grade exhaust gas recirculation valve 18 enter low pressure stage gas compressor 7 forms the medium pressure grade exhaust gas recirculation circuit; Another part further expands through the exhausting waste gas that the expands low pressure stage turbo machine 6 of flowing through, then enter successively the suction port of low pressure stage gas compressor 7 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 the low pressure stage exhaust gas recirculation circuit, thereby satisfy under the middle and slow speed of revolution demand to the vast scale EGR; Then air inlet and compressed through low pressure stage gas compressor 7 together through the waste gas of low pressure stage exhaust gas recirculation circuit is cooled off to increase air density, is increased air inflow with the first order intercooler 9 of flowing through again through the waste gas formation mixed gas of medium pressure grade exhaust gas recirculation circuit; Enter high pressure stage gas compressor 5 through the mixed gas of first order intercooler 9 cooling and further compress, then be further cooled through second level intercooler 10, enter cylinder 1 finally by the intake manifold.(3) if the judged result in the step (1) is high rotating speed operating mode, then described control unit sends opening signal to being installed in the automatically controlled bypass valve 8 that engine exhaust is other to be taken over, part waste gas is directly discharged (air inlet pressure is distributed than the upper limit (UL) that is unlikely to reach setting, optimization high low pressure stage turbine exhaust energy) without high-pressure turbine stage 4 after low pressure stage turbo machine 6 expands.This moment, high pressure stage exhaust gas recirculation valve 14 and low pressure stage exhaust gas recirculation valve 20 were opened (in high rotating speed operating mode, exhaust energy is larger, pressure reduction is larger between exhaust back pressure and the suction pressure), the outlet that the waste gas streams that the part cylinder is discharged enters high pressure stage gas compressor 5 through high pressure stage cooler for recycled exhaust gas 12, the first one-way valve 13 and high pressure stage exhaust gas recirculation valve 14 forms the high pressure stage exhaust gas recirculation circuit; Another part exhausting waste gas enters the suction port of low pressure stage gas compressor 7 by the first grain catcher 11, low pressure stage cooler for recycled exhaust gas 19 and low pressure stage exhaust gas recirculation valve 20 after low pressure stage turbo machine 6 expands, form the low pressure stage exhaust gas recirculation circuit, thereby satisfy under the high rotating speed demand to the vast scale EGR; Then the mixed gas that the waste gas of air inlet and process low pressure stage exhaust gas recirculation circuit forms cools off to increase air density, increases air inflow through first order intercooler 9 together through 7 compressions of low pressure stage gas compressor; Enter high pressure stage gas compressor 5 through first order intercooler 9 cooled mixed gass and be further compressed, then be further cooled through second level intercooler 10 with the waste gas through the high pressure stage exhaust gas recirculation circuit, enter cylinder 1 finally by the intake manifold.(4) if the judged result in the step (1) is middle small load condition, then described control unit sends exhaust valve and early closes signal to being installed in variable exhaust mechanism 3 on the motor, form internal exhaust gas recirculation, guarantee that low-temperature burning catches fire at little steady load; Owing to exhaust energy under the middle small load condition is lower, mainly supplies with internal exhaust gas recirculation and drive high-pressure turbine stage 4 and 6 uses of low pressure stage turbo machine simultaneously; (5) if the judged result in the step (1) is high load working condition, then described control unit sends intake valve pass in evening signal to the variable air inlet mechanism 2 that is installed on the motor, compression temperature and pressure and burning exothermic process subsequently in the control cylinder, thus firing pressure, the effective merit area of increase, reduction burning heat transfer loss improved; The adjusting of variable air inlet mechanism 2 can change the diesel engine effective compression ratio, forms compression ratio less than the miller cycle process of expansion ratio, improves engine thermal efficiency.Exhaust energy is higher under the high load operating mode, exhaust energy mainly drives high-pressure turbine stage 4 and low pressure stage turbo machine 6 does work, and is that follow-up heat exchanger 21, decompressor 22, condenser 23, reflux pump 24 forms the annex acting uses such as Rankine cycles recovery wasted energys driving air-conditionings simultaneously.
As shown in Figure 3, control logic of the present invention is as follows: in the traditional Otto of motor (Otto) circulation and Diesel (Diesel) circulation, increase two-stage brayton cycle, miller cycle and Rankine cycle with EGR, compound thermodynamic cycle process in the full condition range of motor is carried out Collaborative Control.Control strategy is based on the first law of thermodynamics and second law in the full condition range, under the condition that reduces the loss of heat transfer loss and exhaust gas heat, improve the acting ability of engine combustion heat, make the interior hot working fluid mechanical state of cylinder be in real time the balance " ultimate state " of irreversible loss minimum, form and satisfy minimum discharge requirement and the NEW TYPE OF COMPOSITE thermodynamic cycle Optimized model and the combustion control theme that maximize effective thermal efficiency in the cylinder.
Through check: the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE of the present invention thermodynamic cycle can realize fast low-temperature burning process of weak mixture that the in-cylinder combustion reactant mixes full and uniform, abundant dilution.Fully dilution (raising adiabatic index) can improve working medium acting ability, and rapid combustion makes thermodynamic cycle close to desirable constant volume circulation, and low-temperature burning can reduce the heat transfer loss, and reduces exhaust heat.Maximization optimizing process for the engine exhaust capacity usage ratio makes exhaust energy at aspect reasonable layouts such as inside and outside EGR, the exhaust energy that drives turbine, Rankine cycles, effectively utilizes exhaust energy, further the optimization and improvement engine thermal efficiency.Finally the Collaborative Control by available energy/merit transformation efficiency maximization and the compound thermodynamic cycle of novel changable makes the motor effective thermal efficiency improve 10%-15%, Europe 5 Abgasgesetzs are satisfied in original discharging in the noxious pollutant cylinder, and satisfy Europe 6 Abgasgesetzs after installing preprocessor additional.
Embodiment 1
(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 the middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to being installed in the automatically controlled bypass valve that engine exhaust is other to be taken over, exhausting waste gas is through high-pressure turbine stage, the low pressure stage turbo machine expands successively, this moment, medium pressure grade exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve were opened, the outlet that 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 enter the low pressure stage gas compressor of flowing through of part exhausting waste gas forms the medium pressure grade exhaust gas recirculation circuit; Flow through the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve of another part exhausting waste gas enters the suction port of low pressure stage gas compressor, form the low pressure stage exhaust gas recirculation circuit, thereby satisfy under the middle and slow speed of revolution demand to the vast scale EGR; Then air inlet and compressed through the low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit is cooled to increase air density, increases air inflow with the first order intercooler of flowing through again through the waste gas of medium pressure grade exhaust gas recirculation circuit; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and is further compressed, and then is further cooled through second level intercooler, enters cylinder finally by the intake manifold;
(3) if the judged result in the step (1) is high rotating speed operating mode, then described control unit sends opening signal to being installed in the automatically controlled bypass valve that engine exhaust is other to be taken over, the part exhausting waste gas is directly discharged after the low pressure stage turbo machine expands, this moment, high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve were opened, 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 the high pressure stage gas compressor of flowing through of part exhausting waste gas forms the high pressure stage exhaust gas recirculation circuit; Flow through the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve of another part exhausting waste gas enters the suction port of low pressure stage gas compressor, forms the low pressure stage exhaust gas recirculation circuit; Then air inlet and compressed through the low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit is cooled through first order intercooler; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and is further compressed, and then is further cooled through second level intercooler with the waste gas through the high pressure stage exhaust gas recirculation circuit, enters cylinder finally by the intake manifold;
(4) if the judged result in the step (1) is middle small load condition, then described control unit sends exhaust valve and early closes signal to being installed in variable exhaust mechanism on the motor, forms internal exhaust gas recirculation;
(5) if the judged result in the step (1) is high load working condition, then described control unit sends intake valve pass in evening signal to the variable air inlet mechanism that is installed on the motor, forms miller cycle.
Through check: the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE of the present invention thermodynamic cycle can realize fast low-temperature burning process of weak mixture that the in-cylinder combustion reactant mixes full and uniform, abundant dilution.Fully dilution (raising adiabatic index) can improve working medium acting ability, and rapid combustion makes thermodynamic cycle close to desirable constant volume circulation, and low-temperature burning can reduce the heat transfer loss, and reduces exhaust heat.Make the motor effective thermal efficiency improve 10%, Europe 5 Abgasgesetzs are satisfied in original discharging in the noxious pollutant cylinder, and satisfy Europe 6 Abgasgesetzs after installing preprocessor additional.
Embodiment 2
(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 the middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to being installed in the automatically controlled bypass valve that engine exhaust is other to be taken over, exhausting waste gas is through high-pressure turbine stage, the low pressure stage turbo machine expands successively, this moment, medium pressure grade exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve were opened, the outlet that 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 enter the low pressure stage gas compressor of flowing through of part exhausting waste gas forms the medium pressure grade exhaust gas recirculation circuit; Flow through the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve of another part exhausting waste gas enters the suction port of low pressure stage gas compressor, form the low pressure stage exhaust gas recirculation circuit, thereby satisfy under the middle and slow speed of revolution demand to the vast scale EGR; Then air inlet and compressed through the low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit is cooled to increase air density, increases air inflow with the first order intercooler of flowing through again through the waste gas of medium pressure grade exhaust gas recirculation circuit; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and is further compressed, and then is further cooled through second level intercooler, enters cylinder finally by the intake manifold;
(3) if the judged result in the step (1) is high rotating speed operating mode, then described control unit sends opening signal to being installed in the automatically controlled bypass valve that engine exhaust is other to be taken over, the part exhausting waste gas is directly discharged after the low pressure stage turbo machine expands, this moment, high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve were opened, 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 the high pressure stage gas compressor of flowing through of part exhausting waste gas forms the high pressure stage exhaust gas recirculation circuit; Flow through the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve of another part exhausting waste gas enters the suction port of low pressure stage gas compressor, forms the low pressure stage exhaust gas recirculation circuit; Then air inlet and compressed through the low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit is cooled through first order intercooler; Behind first order intercooler, mixed gas enters the high pressure stage gas compressor and is further compressed, and then is further cooled through second level intercooler with the waste gas through the high pressure stage exhaust gas recirculation circuit, enters cylinder finally by the intake manifold;
(4) if the judged result in the step (1) is middle small load condition, then described control unit sends exhaust valve and early closes signal to being installed in variable exhaust mechanism on the motor, forms internal exhaust gas recirculation;
(5) if the judged result in the step (1) is high load working condition, then described control unit sends intake valve pass in evening signal to the variable air inlet mechanism that is installed on the motor, forms miller cycle; Described control unit sends signal to the variable exhaust mechanism that is installed on the motor in addition, stop internal exhaust gas recirculation, part waste gas forms Rankine cycle through heat exchanger, decompressor, condenser, reflux pump, to more than exhaust energy reclaim, further improve engine thermal efficiency.
Through check: the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE of the present invention thermodynamic cycle can realize fast low-temperature burning process of weak mixture that the in-cylinder combustion reactant mixes full and uniform, abundant dilution.Fully dilution (raising adiabatic index) can improve working medium acting ability, and rapid combustion makes thermodynamic cycle close to desirable constant volume circulation, and low-temperature burning can reduce the heat transfer loss, and reduces exhaust heat.The increase of Rankine cycle is effectively reclaimed waste heat energy regenerating, further reduces the exhaust energy loss.Thereby make the motor effective thermal efficiency improve 15%, Europe 5 Abgasgesetzs are satisfied in original discharging in the noxious pollutant cylinder, and satisfy Europe 6 Abgasgesetzs after installing preprocessor additional.
Claims (1)
1. the controlling method of engine high-efficiency low emission NEW TYPE OF COMPOSITE thermodynamic cycle 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 the middle and slow speed of revolution operating mode, then described control unit sends shutdown signal to being installed in the automatically controlled bypass valve that engine exhaust is other to be taken over, this moment, medium pressure grade exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve were opened, the waste gas that cylinder is discharged expands through high-pressure turbine stage, through the part exhausting waste gas that the expands outlet that 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 enter the low pressure stage gas compressor of flowing through, form the medium pressure grade exhaust gas recirculation circuit; Another part further expands through the exhausting waste gas that the expands low pressure stage turbo machine of flowing through, then enter successively the suction port of low pressure stage gas compressor by the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve, form the low pressure stage exhaust gas recirculation circuit; Air inlet and compressed through the low pressure stage gas compressor together through the waste gas of low pressure stage exhaust gas recirculation circuit is then with the first order intercooler cooling of flowing through again through the waste gas formation mixed gas of medium pressure grade exhaust gas recirculation circuit; Enter the high pressure stage gas compressor through the mixed gas of first order intercooler cooling and further compress, then be further cooled through second level intercooler, enter cylinder finally by the intake manifold;
(3) if the judged result in the step (1) is high rotating speed operating mode, then described control unit sends opening signal to being installed in the automatically controlled bypass valve that engine exhaust is other to be taken over, the part exhausting waste gas is directly discharged after the low pressure stage turbo machine expands, this moment, high pressure stage exhaust gas recirculation valve and low pressure stage exhaust gas recirculation valve were opened, the exhausting waste gas that the part cylinder the is discharged outlet that high pressure stage cooler for recycled exhaust gas, the first one-way valve and high pressure stage exhaust gas recirculation valve enter the high pressure stage gas compressor of flowing through forms the high pressure stage exhaust gas recirculation circuit; Another part exhausting waste gas enters the suction port of low pressure stage gas compressor by the first grain catcher, low pressure stage cooler for recycled exhaust gas and low pressure stage exhaust gas recirculation valve after the low pressure stage turbo machine expands, form 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 compresses through the low pressure stage gas compressor together, mixed gas after the compression enters the high pressure stage gas compressor and further compresses after the cooling of first order intercooler, then further cool off through second level intercooler with the waste gas through the high pressure stage exhaust gas recirculation circuit, enter cylinder finally by the intake manifold;
(4) if the judged result in the step (1) is middle small load condition, then described control unit sends exhaust valve and early closes signal to being installed in variable exhaust mechanism on the motor, forms internal exhaust gas recirculation;
(5) if the judged result in the step (1) is high load working condition, then described control unit sends intake valve pass in evening signal to the variable air inlet mechanism that is installed on the motor, forms miller cycle.
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Cited By (4)
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| CN106762294A (en) * | 2016-11-22 | 2017-05-31 | 天津大学 | A kind of method of flexible control engine combustion mode |
| CN106968811A (en) * | 2015-10-22 | 2017-07-21 | 曼卡车和巴士股份公司 | Method for running internal combustion engine especially Diesel engine |
| CN110206641A (en) * | 2019-04-29 | 2019-09-06 | 天津大学 | Compression ignition engine and its method for realizing low temperature combustion mode |
| CN112196682A (en) * | 2020-10-15 | 2021-01-08 | 潍柴动力股份有限公司 | Method and device for controlling an exhaust gas recirculation valve |
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| CN106968811A (en) * | 2015-10-22 | 2017-07-21 | 曼卡车和巴士股份公司 | Method for running internal combustion engine especially Diesel engine |
| CN106968811B (en) * | 2015-10-22 | 2021-05-28 | 曼卡车和巴士股份公司 | Method for operating an internal combustion engine, in particular a diesel engine |
| CN106762294A (en) * | 2016-11-22 | 2017-05-31 | 天津大学 | A kind of method of flexible control engine combustion mode |
| CN106762294B (en) * | 2016-11-22 | 2019-03-05 | 天津大学 | A kind of method of flexible control engine combustion mode |
| CN110206641A (en) * | 2019-04-29 | 2019-09-06 | 天津大学 | Compression ignition engine and its method for realizing low temperature 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 |
| CN112196682A (en) * | 2020-10-15 | 2021-01-08 | 潍柴动力股份有限公司 | Method and device for controlling an exhaust gas recirculation valve |
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| CN102889147B (en) | 2015-01-21 |
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