[Liu, 5(1): December018] ISSN 48 804 DOI- 10.581/zenodo.09405 Imac Facor- 5.070 GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES RESEARCH ON THE COMPARISONS BETWEEN SABAH CYCLE AND DIESEL CYCLE OF COMMON RAIL DIESEL ENGINE Feng Liu Technical Dearmen, Yinjian Auomobile Reair Co., Ld., Beijng, China Absrac Pressure consan re-exansion raio has direcly influence on he highes emeraure of Diesel cycle. The common rail injecion sysem also has direcly influence on he highes emeraure and re-exansion raio, hereby, i also affecs he echnical indices, such as hermal efficiency and average valid ressure. Taking Naional VI emission sandard diesel from Weicai comany as an insance, he highes emeraure and oher echnical indices of Sabah cycle wih a common rail injecion sysem and Diesel cycle wihou a common rail injecion sysem were comared. Key words: Common Rail Injecion Sysem, Diesel Cycle, Sabah Cycle. I. INTRODUCTION Diesel cycle is an inner reversible cycle of a diesel s ressure consan ideally heaing: consiues wih an irreversible volume consan hea releasing rocess, a reversible ressure consan hea absorion rocess, and double enroy consan rocesses. I mainly alies for diesel engine. The research on he common rail diesel engine in his hesis is based on he diesel engine of he Weicai Naional VI emission sandard. The diesel engine is designed and imroved on he basis of he diesel engine of he naional V emission sandard [1], inheriing he advanced echnology of Weicai excellen erformance and high reliabiliy[][][4][5], and hen can move oward higher emission sandards. The echnical arameers relaed o he diesel engine are shown in Table 1. Table 1. Relevan Parameers of Common Rail Engine Emission Sandard Naional VI Model Turbo & Middle Cooler, Elecric Conrol (High Pressure Common Rail Injecion Sysem) Exhaus Volume 11.596L Cylinder Diameer Pison Travel 16 155mm Raed Power 45kW Raed Seed 1900r/min Maximum Torque 1600N m Comress Raio 17:1 Igniion Order 1-5--6--4 Turbo Raio 1.85:1 The comosiion of he high ressure common rail fuel injecion sysem mainly includes [][][4][5]: oil suly um, common rail ie, high ressure oil ie, fuel injecor, elecronic conrol uni and various sensors; Is basic working rincile is as follows: he oil suly um delivers he fuel o he common rail, and he oil suly mehod is comleely indeenden of he injecion rocess by he elecronic conrol mehod;
[Liu, 5(1): December018] ISSN 48 804 DOI- 10.581/zenodo.09405 Imac Facor- 5.070 The high-ressure oil um of he common rail sysem mainly uses he CP.N-16/18 high-ressure oil um; he mechanical ar of he high-ressure common rail fuel injecion sysem and he acuaor are Bosch relaed ars, and he injecor is a CRIN ye injecor. The elecronic conrol uni ados EDC7, and he common rail ieline ados LWRN ye common rail. II. DIESEL CYCLE AND SABAH CYCLE Configured wih a common rail injecion sysem, here are exremely direcly influences on he diesel engine s hermal cycle. This hesis mainly researches on he cycle efficiency and average ressure comaring wih he Sabah cycle configured wih a common rail sysem and he Diesel cycle configured wihou a common rail sysem. Sabah cycle is mixing heaing ideally inner reversible cycle..1 Diesel Cycle The -v char of a diesel engine s Diesel cycle configured wihou a common rail injecion sysem is shown in figure 1, and figure is is T-s char. Table is is iniial relevan arameers. Figure 1. Diesel Cycle s -v Char Figure. Diesel Cycle s T-s Char Table. Relevan Parameers of Diesel Cycle(Commens: he environmen emeraure is -, No. -10 diesel fuel, exernal characerisic raed seed) Diesel Cycle Air Inake Inake Pressure Pressure Consan Pre-Exansion Temeraure Relevan Parameers 7 1.85bar Among hem, he average ressure could be exressed as below: a Q 1 (-1) cvta 1 c 1 a B c Comress Raio: =17; Enroy consan index: =1.4;Poin 1 Saus: =1.85bar, =00K; c T c 0.718 kj / ( kg K; ) V Research Resuls 1- is enroy consan rocess, c 1.005 1kJ / ( kg, 1K ) T v T v T (17) Ta Ta a a 1 1 c Subsiue he corresonding daa, =91.75 9K, T T =186.5 1864K; T Inake secific volume: v a a, 8700 R v g a 0.465 m / kg v 5 4 T 1.8510 a a
[Liu, 5(1): December018] ISSN 48 804 DOI- 10.581/zenodo.09405 Imac Facor- 5.070, va v 0.074 m / kg v v 0.0548 m / kg c -4 is enroy consan rocess, 1, =79K 1 T v T v Cycle Hea Absorion =1.005 (186.5-91.75)=96kJ/kg QB c ( ) TT Q B 4 4 Cycle Hea Release: =0.718 (79-00)=5kJ/kg Cycle Hea Efficiency: Q cv ( T4 T1 ) wne QB Q 96 5 58 6.86% QB QB 96 96 Cycle Average Efficien Pressure : From formula -1: 1.bar Enroy Consan Process,,, v v a a T 4 97.7bar a c Irreversible volume consan rocess,, 4 a 4 4.88 4.9bar T4 Ta. Sabah Cycle Figure is he -v char of he diesel s Sabah cycle configured wih a common rail injecion sysem, figure 4 is is T-s char, able is he iniial relevan arameers of he Sabah cycle. The common rail injecion ressure is high, herefore, he highes ressure of he cycle is high, he value is 140bar. The iniial air saus arameers refer o Diesel cycle. Comress Raio =17, enroy consan index = 1.4 c Table. Relevan Parameers of Sabah Cycle(Commens: he environmen emeraure is -, No. -10 diesel fuel, exernal characerisic raed seed) Sabah Cycle Air Inake Temeraure Inake Pressure Cycle Highes Pressure Relevan Parameers 7 1.85bar 140bar Among hem, 140bar ' 4' 4
[Liu, 5(1): December018] ISSN 48 804 DOI- 10.581/zenodo.09405 Imac Facor- 5.070 Figure. Sabah Cycle -v char Figure4. Sabah Cycle T-s char Wheher he common rail sysem is equied only involves and affecs he heaing rocess of he in-cylinder hermodynamic cycle, and does no involve any change of he exhaus sysem. The ideal exhaus gas sae of he diesel engine is he same. Therefore, v, 5' v4 v1' v1 0.465 m / kg T5' T4 79K Enroy consan rocess, v, 5' 4 4.88 4.9bar - reversible volume consan, The ressure consan re-exanion: T' T' T 140, T' T 15.5K 97.7-4 reversible ressure consan, Cycle hea absorion - reversible volume consan rocess, QB' '' cv( T' T' ) 0.718(15.5 9) 90 kj / kg -4 reversible ressure consan rocess, QB' '4' c( T4' T' ) 1.005(057 15.5) 75 kj / kg Q ' Q ' Q ' 90 75 1015 kj / kg Q Cycle hea release: Cycle hea efficiency: 4.88 v 4' 4' 5' 5' 5' 1.4 v4' v5' v5' 0.04 m / kg 4' 140 ' ' 0.074 / ' ' Q B ' v v v m kg v v 4' ' 1.54 ' 4' ' 0.04 0.074 T ' T 057K B B '' B '4' B Q ' 5 / Q kj kg w ' Q ' Q ' 1015 5 66 ne B ' 65.% QB' QB' 1015 1015 ' 15.1bar ' 5
[Liu, 5(1): December018] ISSN 48 804 DOI- 10.581/zenodo.09405 Imac Facor- 5.070 Cycle average efficien ressure : from formula -1, I can be seen ha under he same iniial arameer condiions, he Sabah cycle is sronger han he Diesel cycle in erms of cycle hea absorion, cycle hea efficiency, and cycle average effecive ressure. However, in erms of ressure consan re-exansion raio, he Sabah cycle is lower han he Diesel cycle. The hea absorion of he Diesel cycle consan ressure rocess increases, and he cycle hea efficiency decreases, because his ar of he hea is added in he downward exansion sroke of he ison, and he funcional force is relaively low, and his is also he Diesel cycle ressure consan re-exansion raio s higher cause. III. ADVANTAGES OF COMMON RAIL TECHNOLOGY 1. The common rail sysem increases he in-cylinder ressure, combusion emeraure, hea release rae, and reduces soo emissions[6][7][8];. The imrovemen of he injecor can increase he ressure in he cylinder and he combusion emeraure;. The oimizaion of he relevan fuel injecion arameers by he elecronic conrol uni raises he eak value of he cylinder ressure, emeraure and hea release rae; and he fuel consumion is reduced, and he indicaed orque and he indicaed ower are increased[9]. 4. In shor, he common rail sysem will be imroved from he in-cylinder hermal rocess of he diesel engine, or from he emission, economy and ower of he diesel engine. IV. CONCLUSIONS This aer inroduces he conce of diesel common rail sysem and he srucure and working rincile of he common diesel sysem of Weicai 5 diesel engine; Comaring he Sabah cycle wih he common rail sysem and he Diesel cycle diesel engine wihou he common rail sysem, and hrough calculaion and calculaion, he cycle hea absorion and circulaion of he diesel Diesel cycle and he Sabah cycle are obained. The resuls of hermal efficiency and average effecive ressure show ha he Sabah cycle has cerain advanages in erms of cycle hea absorion, cycle hea efficiency, and average effecive ressure. In erms of ressure consan re-exansion raio, he common-bar sysem Sabah cycle is significanly lower han he Diesel cycle; Inroduce he advanages of he diesel common rail sysem in all asecs of he diesel engine REFERENCES 1. BOSCH Elecronic engine managemen for diesel engine: Diesel accumulaor fuel-injecion sysem Common Rail. Technical Insrucion,1999. Masahiko Miyaki, Hideya Fujisawa, e al. Develomen of New Elecronically Conrolled Fuel Injecion Sysem ECD-U for Diesel Engines[J]..SAE Transacions 9105. T.R Whie,B.E.Milon and M.Behnia.Direc Injecion of Naural Gas/Liquid Diesel Fuel Srays[J].15h Ausralasian Fluid Mechanics Conference,1-17 Dec 004 4. M. Badami,P. Nuccio,G. Trucco,e al. Influence of Injecion Pressure on he Performance of a Di Diesel Engine Wih a Common Rail Fuel Injecion Sysem[J]. SAE aer 1999-01-019 5. Naeim A.Henein,Inderal Singh,Ming-Chia Lai.Characerisics of a Common-Rail Diesel Injecion Sysem Under Pilo and Pos-Injecion Modes[J]. SAE aer 00-01-018 6. Anonio Ficarella,Paolo Carlucci,Domenico Laforgia.Effecs of Pilo Injecion Parameers on Combusion for Common-Rail Diesel Engines[J].SAE aer 00-01-070 6
[Liu, 5(1): December018] ISSN 48 804 DOI- 10.581/zenodo.09405 Imac Facor- 5.070 7. Mallamo F,Badami M,Millo F.Effec of comression raio and injecion ressure on emissions and fuel consumion of a small dislacemen common rail diesel engine[j].sae Technical Paer.Deroi:Sociey of Auomoive Engineers Ine.,005 8. Anonio Ficarella,Paolo Carlucci,Domenico Laforgia. Effecs of Pilo Injecion Parameers on Combusion for Common-Rail Diesel Engines[J]. SAE aer 00-01-0700 9. Kohji Nagaa. Technologies of Denso Common Rail for Diesel Engine and Consumer Values[J]. SAE aer 004-1-0075. 7