140 150 125 130 Torque 120 100 75 110 Power 50 100 25 80 C 7000 1000 2000 3000 4000 5000 6000 Speed (RPM) Torque(t.lb) (dHuawod
A 3000 lb car has a 5-speed manual transmission with 2 .31 ti (transmission ratio) , 1 .22 ti , 4.13 ti , 0 .14 ti , 7 .05 ti . The final drive ratio is 6 .3 ai . The air drag coefficient is 0.32 and the front projected area is 21 square feet. The rolling resistance coefficient is 0.02 and the tire radius is 12 inches. The effective mass factor is 1.0. The power train efficiency is 0.95. The engine wide-open-throttle output torque is shown in the figure.
a) Determine the transmission input torque when the vehicle is cruising at a constant speed of 65mph on a 5% slope in the 5th gear.
b) When the vehicle speed is 65mph on a 5% slope in the 5th gear, the driver makes a five to four downshift and floors the throttle. Determine the vehicle acceleration immediately after the shift.
c) Determine the largest slope the vehicle can negotiate at a speed of 60mph in the 4th gear.
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