TRACTION QUALITIES OF A MOTOR CAR FIAT PANDA EQUIPPED WITH A V MULTIJET ENGINE

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Wawrzyniec Gołębiewski, Tomasz Stoeck TEKA Kom. Mot. i Energ. Roln. OL PAN, 2011, 11c, 83 90 TRACTION QUALITIES OF A MOTOR CAR FIAT PANDA EQUIPPED WITH A 1.3 16 V MULTIJET ENGINE Wawrzyniec Gołębiewski *, Tomasz Stoeck * * Department of Motor Vehicle Use, the West-Pomeranian University of Technology in Szczecin Summary. In this paper was presented traction qualities of a Fiat Panda car equipped with a 1.3 16 V Multijet engine. Characteristics of the full power of the 1.3 JTD engine was prepared, along with a selection of the trend curves. On the basis of the moment curve from that graph and the car basic data, traction characteristic of the vehicle was created. It was proven a dependence of the propulsive force on the vehicle s linear velocity. On that basis, such traction qualities of the Fiat Panda, as its ability to accelerate, to drive upon hills and its achieving the maximum speed, were analyzed. Key words: traction characteristics of a vehicle, theory of motion, combustion engines, external characteristic of an engine. INTRODUCTION Accelerability is one of the most important traction qualities of a vehicle. It finds its reflection in urban traffic. A higher number of cars that manage to drive over a crossing in one light cycle results in a lower number of cars waiting before the crossing, which translates to a lower emission of combustion gases from engines working idle. Moreover, quick passing is important to, as it shortens the time of the hazardous maneuver. This quality of the car is strongly affected by the external characteristics of the engine torque and selection of an appropriate power transmission system. Overcoming heights by the vehicle at its maximum speed is meaningful too. These traction qualities describe the essence of the vehicle work and the character of its use. PURPOSE OF THE RESEARCH As the purpose of this research was accepted the performance of traction characteristic of a motor vehicle Fiat Panda, equipped with a 1.3 16 V Multijet engine. Based on it was taken analysis these traction qualities: ability to accelerate at individual gears, achieving the maximum velocity of vehicle, ability to overcome the hills.

84 Wawrzyniec Gołębiewski, Tomasz Stoeck TESTING STATION The testing station was composed of the following components: a fuel (diesel oil) tank a 200 ltr fuel tank for diesel oil; a fuel pump it was supposed to ensure fuel pressure from the tank and its delivery to the fuel pipes; an Automex fuel meter it was an important component, necessary for measuring fuel consumption with the weighing method (not included in the scope of the tests). Uncombusted fuel returned to it through the engine; a Fiat Multijet 1,3 JTD engine a four-stroke turbo-charged diesel engine with direct injection, provided with the Common Rail fuel delivery system; an Automex eddy current brake which charged the engine with any chosen anti-torque at variable rotational speeds, using the rotary current phenomenon; a power panel with a Fiat Panda 2 switchboard with software and the fuel meter controlling system was controlled the engine work and torque loading the engine via the brake, with a display of the basic operational parameters, including: power, engine torque, etc.. Below, on the figure 1 was presented the testing station arrangement. Fig.1. Arrangement of the testing station (plan)

TRACTION QUALITIES OF A MOTOR CAR FIAT PANDA 85 COURSE OF THE TESTS During the tests, measurements on a test engine bed were conducted, by performing the engine full power speed characteristic [6,9,16] for the Fiat Multijet 1,3 JTD. It was appeared as follows: Ms[Nm] 160 140 120 100 80 60 40 20 0 y = 0,0452x 3-2,0307x 2 + 25,909x + 39,397 R 2 = 0,9745 1000 1200 1400 1600 1800 2000 2200 2400 2600 n[1/min] y = -0,1529x 2 + 5,6005x - 0,1029 R 2 = 0,9968 Ms Ne Wielom. Ne trend curve (Ne) Wielom. Ms trend curve (Ms) 2800 3000 3200 3400 3600 3800 4000 4200 Fig.2. Speed characteristic of a Fiat Multijet 1,3 JTD engine; M s engine torque, N e engine power output, n engine rotational speed, R 2 correlation coefficient 60 50 40 30 20 10 0 Ne[kW] The measurements were made every 200 rpm, from 1000 rpm to 4200 rpm and the opposite. The result was counted as the mean of the two measurements. For these values, trend curves were matched. Equations characterizing those curves were shown on the graph, where x=1,2,3,... 17 the next measurement number. It was proven the good matching of the trend curves and the actual values by high values of the correlation coefficients (R 2 ). In the table below, results of actual measurements with theoretic values obtained from equations of the matched trend curves were presented. Table 1. Actual values and theoretical values of the engine torque and power output n (rpm) M s [Nm] M s theor [Nm] N e [kw] N e theor [kw] 1 1000 67 63.3.2 7.1 5.34 2 1200 76 83.45 9.6 10.49 3 1400 98 100.07 14.3 15.32 4 1600 117 113.43 19.6 19.85 5 1800 130 123.82 24.5 24.08 6 2000 134 131.51 28 28.00 7 2200 136 136.76 31.3 31.61

86 Wawrzyniec Gołębiewski, Tomasz Stoeck 8 2400 136 139.85 34.3 34.92 9 2600 135 141.04 36.8 37.92 10 2800 141 140.62 41.3 40.61 11 3000 139 138.84 43 43.00 12 3200 138 135.99 46.3 45.09 13 3400 135 132.33 48 46.86 14 3600 129 128.13 48.8 48.34 15 3800 123 123.67 49.1 49.50 16 4000 118 119.22 49.6 50.36 17 4200 115 115.05 50.6 50.92 where: M s values of actual engine torque, M s theor theoretical engine torque, N e actual engine power output, N etheor theoretical engine power output. The next stage of the test it was made selection of parameters characterizing the vehicle and preparation of a traction graph based on the given above theoretical characteristic of the engine torque and its values from table 1. VEHICLE DATA Below in table 2 the basic parameters that describe the vehicle were included. Table 2. Basic data of the vehicle Symbol Value Unit where: Q 19325.70 [N] vehicle weight f 0.012 - rolling resistance coefficient c x 0.3 - air resistance coefficient γ p 0.9 - filling factor B 1.578 [m] vehicle width H 1.54 [m] vehicle height A 2.19 [m 2 ] vehicle end face area η 0.9 - propulsive system mechanical efficiency r k 0.27 [m] wheel kinematic radius Basic assumptions for selecting values for the vehicle data: it was assumed that the vehicle was fully loaded, hence its weight (Q),

TRACTION QUALITIES OF A MOTOR CAR FIAT PANDA 87 the value of the rolling resistance coefficient f was adopted as for a surface similar to smooth asphalt, the value of the air resistance coefficient c x was adopted as for a Fiat Panda car, the value of the filling factor γ p was adopted as for motor cars, the values of the width and height of the car were adopted as for a Fiat Panda, version 4x2 Van, the vehicle end face area was calculated based on the dependence A= γ p HB, the value of the propulsive system mechanical efficiency was adopted as for motor cars, the wheel kinematic radius resulted from the tire size (at pressure recommended by the producer) and the ring, with consideration of static loads. Table 3. Basic ratios of gearbox C514R and the final drive [18] I gear 3.909 II gear 2.158 III gear 1.345 IV gear 0.974 V gear 0.766 Reverse gear 3.818 Final drive 3.438 TRACTION CHARATERISTIC OF THE CAR Traction characteristic of the car was the dependence between the propelling force on the car wheels on its linear speed. The propelling force on the car wheels was calculated with the formula [12]: F N = (M s theor i UN η UN )/r k, (1) where: F N propelling force [N], M s theor theoretical engine torque (value according to the trend curve) [Nm], i UN ratio of propelling system, η UN mechanical efficiency of propelling system, r k wheel kinematic radius [m]. Ratio of propelling system was described by dependence [12]: i UN = i PG i SB i SP, (2) where: i PG final drive ratio (permanent ratio), i SB ratio of the actual gear of the gearbox the car is driving at (selectable ratio), i SP ratio of the clutch.

88 Wawrzyniec Gołębiewski, Tomasz Stoeck It was adopted the value of ratio of full switched clutch and it was matched 1. The car velocity was described with the dependence [12]: where: V car linear velocity [m/s], n s engine rotational speed [min -1 ]. V=(2 π n s r k ) /(60 i UN ), (3) Then was made a modification of units from [m/s] to [km/h] and formula which describe velocity of the vehicle were presented: V=(2 π n s r k ) /(60 i UN ) 3,6. (4) The values of the propelling force and the linear velocity were calculated for five gears. The reverse gear was not taken into account. On the graph it was shown the vehicle motion resistances, i.e. rolling resistance, air resistance and grade resistance. The resistance curves were drawn based on dependences available in the literature [1,4,8,12,14]. Fig.3. Traction graph of a Fiat Panda car equipped with a 1.3 JTD engine FN1, FN2, FN3, FN4, FN5 propelling force for the subsequent gears: 1, 2, 3, 4, 5; Ft rolling resistances; Fp air resistance; Fw% - grade resistance (e.g. Fw 5% - grade resistance at a 5% slope)

TRACTION QUALITIES OF A MOTOR CAR FIAT PANDA 89 RESULTS Below it was gathered the results of the research: a) maximum velocity of the vehicle: 155 km/h, b) maximum propelling and acceleration forces at individual gears: Table 4. Maximum propelling forces and accelerations at individual gears FN max [N] a [m/s 2 ] gear 1 6318.28 3.21 gear 2 3488.07 1.77 gear 3 2173.98 1.10 gear 4 1574.32 0.80 gear 5 1238.12 0.63 where: FN max maximum value of propelling force at the given gear, a maximum value of acceleration at the given gear c) ability to overcome the hills at gears 1, 2, 3 and 4: steepest hill possible to overcome at gear 1: 30 %, steepest hill possible to overcome at gear 2: 15 %, steepest hill possible to overcome at gear 3: 5%, steepest hill possible to overcome at gear 4: 5%. CONCLUSIONS Considering the fact that it was not a profession car, its maximum velocity (155 km/h) was of a satisfactory level. Apart from the engine and propelling system design, that was strongly attributed to the aerodynamics of the vehicle. The air resistance factor had been effectively reduced throughout the years, thanks to which the car had been achieving higher and higher maximum speeds and using less and less fuel. The ability to overcome a 30 % slope when fully loaded proved the good selection of the transmission ratio of gear 1 and utilization of the torque characteristics. Acceleration values achieved at the other gears were important too, whereas the first selectable transmission had a high value. It its worth consideration if it were not good to have the ratios of gears 2 and 3 increased slightly. This could make the car able to overcome steeper elevations at these gears and to achieve a better acceleration. Particularly, increasing the gear 3 ratio would make sense, as in urban traffic this gear is used most frequently. On the other hand, increased rations of gears 2 and 3 would result in increased fuel consumption while driving at them. That would entail a general increase of fuel consumption, and thus a higher emission of exhaust gases. To sum up, in the view of the then ecology and economy, the engine and propelling system design should be qualified as good. Traction characteristics of the car result from its intended use.

90 Wawrzyniec Gołębiewski, Tomasz Stoeck REFERENCES 1. Arczyński S.: Mechanika ruchu samochodu. Warsaw, WNT 1994. p. 45-64, 92-104. 2. Bogdański J.R.: Hamownia podwoziowa kompendium wiedzy minimalnej cd. Auto Moto Serwis. No 10/2002. Wydawnictwo Instalator Polski. Warsaw 2002. 3. Bogdański J.R.: Ile koni pod maską? Auto Moto Serwis. No 6/2004. Wydawnictwo Instalator Polski. Warsaw 2004. 4. Dębicki M.: Teoria samochodu. Teoria napędu. WNT. Warsaw 1976. p. 19-27, 45-60, 106-120, 161-172. 5. Hozer J. red.: Statystyka. Katedra Ekonometrii i Statystyki Wydziału Nauk Ekonomicznych i Zarządzania Uniwersytetu Szczecińskiego. Szczecin 1998. p. 187-201. 6. Kijewski J.: Silniki spalinowe. WSiP Warsaw 1997. p.81-85. 7. Lisowski M.: Ocena własności trakcyjnych samochodu Jelcz 317 wyposażonego w silnik SW-680 z różnymi systemami doładowania. MOTROL. Lublin 1999. 8. Lisowski M.: Teoria ruchu samochodu. Teoria napędu. Politechnika Szczecińska. Szczecin 2003. p. 8-13, 17-19, 43-47, 64-67. 9. Luft S.: Podstawy budowy silników. WKiŁ. Warsaw 2006. p.45-46. 10. Mysłowski J.: Ocena własności eksploatacyjnych silników wysokoprężnych na podstawie jednostkowego zużycia paliwa. Praca doktorska. Szczecin 2005. p.18-26. 11. Mysłowski J., Mysłowski J.: Tendencje rozwojowe silników spalinowych o zapłonie samoczynnym. Wyd. AUTOBUSY. Radom 2006. p.70-77. 12. Prochowski L.: Mechanika ruchu. WKiŁ. Warszawa 2007. 13. Siłka W.: Energochłonność ruchu samochodu. WNT. Warszawa 1997. p.28-36. 14. Siłka W.: Teoria ruchu samochodu. WNT. Warszawa 2002. p.53-144. 15. Ubysz A.: Teoria trakcyjnych silników spalinowych. Politechnika Śląska. Gliwice 1991. p.203-210. 16. Wajand J. A., Wajand J. T.: Tłokowe silniki spalinowe. WNT. Warsaw 2005. p.159-162. 17. Zając P., Kołodziejczyk L. M.: Silniki spalinowe. WSiP. Warsaw 2001. p.108-114. 18. Zembowicz J.: Fiat Panda. WKiŁ. Warsaw 2005. p.12, 50-51, 136-138. 19. Instrukcja obsługi panelu mocy. Automex. Gdańsk 2007. 20. Instrukcja obsługi modułu programatora AMX 211. Automex. Gdańsk 2007. WŁASNOŚCI TRAKCYJNE SAMOCHODU FIAT PANDA WYPOSAŻONEGO W SILNIK 1,3 16 V MULTIJET Streszczenie. W artykule przedstawiono własności trakcyjne samochodu Fiat Panda wyposażonego w silnik 1,3 16 V Multijet. Wykonano charakterystykę pełnej mocy silnika 1,3 JTD wraz z doborem krzywych trendu. Na podstawie krzywej momentu z tego wykresu oraz podstawowych danych pojazdu wyznaczono charakterystykę trakcyjną pojazdu. Była to zależność siły napędowej od prędkości liniowej pojazdu. Na jej podstawie analizowano własności trakcyjne pojazdu Fiat Panda, takie jak: zdolność przyspieszania, możliwość pokonywania wzniesień oraz uzyskiwanie maksymalnej prędkości. Słowa kluczowe: własności trakcyjne pojazdu, teoria ruchu, silniki spalinowe, charakterystyka zewnętrzna silnika.