Automotive Engineering II                           Exam. 2

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1- A) Define the following:

i- Pitch motion

ii- Turning circle diameter

iii- Toe in

iv- Ackerman angle

B) Electronic Stability Program (ESP):

What is it?

How it works?

Parts (components)

 C) Camber angle:

What is it?

Its function:

The problems if not correctly adjusted

D) What are the factors that lead to increasing the tire lateral stiffness?

2) Find the inner angle of steering front wheel (d_o), if the car track (t) is 2.00 m, and the car wheel base (b) is 3.6 m, the outer steer angle (d_o) = 15^o. Where: cot d_o – cot d_i = t/b

3) A passenger car has a weight (w) of 24 kN, and a wheel base (b) of 3.6 m. The weight distribution on the front axle is 55% and that on the rear axle is 45% under static conditions. If the cornering stiffness of each of the front tires (C_{a f} ) is 35 kN/rad and that of the rear tires (C_{a r}) is 36 kN/rad. Where the steer angle is

i) Find the slip angle of the front tires (a_f)

ii) Find the steer angle (d_f)

4) A car has a weight (w) N, and a wheel base (b) m, the CG is (x) m behind the front axel and (y) m in front of the rear wheel, and (h) m above ground. Find:

 i) Rear wheel reaction (R_r)

ii) the transferred weight (wt) due to ascending a gradient (θ)
iii) the maximum gradient if the car is RWD. If the adhesion coefficient is (m).