Assignment on Automotive Engineering
Added on 2020-04-13
10 Pages1492 Words69 Views
1University AffiliationAutomotive EngineeringAssignment 2Student NameStudent Registration NumberDate of Submission
2INTRODUCTIONThe purpose of this assignment is to compare the calculated results with the manufacture orfactory data. In this report the car chosen is the 2007 Lexus is250, 6 speed manual DX. The caris equipped with a manual 6 speed transmission. The calculation that is included in the reportseeks to discuss the top car speed, top gear ratio, overall gear ratio for the 6 speeds, and the firstgear ratio. Each section has several calculations which are done and the vehicle manufacturerspecifications are indicated in the input parameter section as provided in the attached data sheetthat contains model information. There is an assumption on an increment of 20 percent of theengine power. The increment will require that a new top speed is calculated. The report will alsoseek to find ways to increase the top speed of the vehicle in the least expensive method. VEHICLE DRIVING CONDITIONS & APPLICATIONS(i)Case study of a manual sports car in the year 2004 – 2007Car Type: 2007 Lexus is250 sports car(ii)Input parametersInput ParameterValue1.Engine Useful power (@ rpm)204 kW @ 64002.Max. engine Torque (@ rpm)185 @ 48003.Height56.5 inches4.Track (in., front/rear)59.0 / 60.25.Body Drag Coefficient0.286.Wheel & Tires details 18x8 245/45 R 18 (rear)7.Rolling resistance coefficientvalues at extreme drivingconditionsFlow = 0.011 @ Top Speed on concrete,asphalt8. Curb & Gross Weights11534 kg and 1647 kg9.Final Drive ratio4.29010. Max Gradient Climbable in 1stSpeed gear (@ Gross Weight inpercent)11.Number of forward (Speed) gears5Part 1Vehicle driving conditions and applications. This section discusses briefly how the drive train configuration satisfy the requirements. Theinput parameters and assumptions ought to underpin the calculation model.
3Part 2Calculations to obtain(i)Top car speedTop speed is attained when using the maximum engine power. To calculate the top speed theengine power of the vehicle must attain the 204 kW at a revolutionary speed of 6400 revolutionsper minute. To obtain the top speed,Pwmax=usefulenginepowerFW=totalmotiveforceVmax=topcarspeedPwmax=FwxυmaxTo find the total motive force,FW=Froll+FDrag+FgradTo obtain the climbing resistance force,(Assumption: Negligible wind energy, Negligible gradient climb)Vair=0msFgrad=0NCalculating the rolling resistanceFroll=fxmxgxcosαWhere the f is the coefficient of rolling and flow =0.017 at top speed on a level smooth road.M= vehicle curbs mass, in kilograms, g is the gravitational force given as 9.81 m/s2 and α is the gradient angle in degrees. Froll=(0.017)(1647)(9.81)cos(0)
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