Question

You are tasked with designing a new 4-stroke engine for an autonomous vehicle platform. The desired specifications are shown in the table below. The engine power and torque requirements will be significantly lower than a conventional engine since the vehicle does not have to be fun to drive". Each cylinder will have a displacement of 0.5 L, and a compression raso of 12 to 1 5 KWT 5000rpm onjue BMEP @ Peak T Vapsr sylind 12 bar a) Given the design constraints, determine the number of cylinders required (round up to nearest integer value), and the total engine displacement in [L] (1000 L- 1 m3,1 bar 100 kPa). b) Delermine the clearance volume in and the total volume af BDC for each cylinder in (L c) To minimize heat transfer losses, the engine will be "square" which means that the bore and the stroke are the same size. Calculate the required cylinder bore in [mm) d) Determine the engine load (MEP) at peak power in (barl. e) Determine the minimum required diameter of a single inlet valve in (mm) given the following information(Assume the valve reference area is the nominal valve area, e. Ai m/4'dv2, and the Mach Index should not exceed 0.5 at any engine speed) Discharge ontL T [K 1.3 f) If two intake valves are used, determined the required diameter of each inlet valve in [mml. (Assume the same conditions as the previous part)

Answer 1

in figure position of the piston at the top is known as TDC and at bottom it is BDC

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