Automotive Engineering II Exam. 2

Student Name: Student Number:

 

 

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 (do), if the car track (t) is 2.00 m, and the car wheel base (b) is 3.6 m, the outer steer angle (do) = 15o. Where: cot do cot di = 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 (Ca f ) is 35 kN/rad and that of the rear tires (Ca r) is 36 kN/rad. Where the steer angle is

 

 

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

 

 

 

 

 

ii) Find the steer angle (df)

 

 

 

 

 

 

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 (Rr)

 

 

 

 

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).