Automotive Engineering II Exam. 2
Student Name: Student Number:
1 A) Define the following عرف التالي:
i Yaw motion
ii Track circle diameter (D_{s})
iii King pin inclination (KPI, SAI)
iv Steering ratio
B) Traction Control System (TCS, ASR):
What is it? 

How it works? 

Parts (components) 

C) Caster angle:
What is it? 

Its function: 

The problems if not correctly adjusted 

D) What are the factors that lead to car under steer?
2) Find the inner angle of steering front wheel (d_{i}), if the car track (t) is 1.80 m, and the car wheel base (b) is 3.2 m, the outer steering angle (d_{o}) = 18^{o}. Where: cot d_{o} – cot d_{i }= t/b
3) A passenger car has a weight (w) of 20 kN, and a wheel base (b) of 3.2 m. The weight distribution on the front axle is 60% and that on the rear axle is 40% under static conditions. If the cornering
stiffness of each of the front tires (C_{a} _{f}) is 37 kN/rad and that of the rear tires (C_{a}_{ r }) is 36 kN/rad. Where the steer angle is
_{} 
i) Find the under steer coefficient (K_{us}). Dose the car have (neutral, under, over steer)?
ii) Find the steer angle (d) if the car has neutral steer, when it is negotiating a curve (R) of 24 m, at a velocity (v) of 72 km/h.
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 axle, and (h) m above ground. Find:
i) Front wheel reaction (R_{f})
ii) the transferred weight (w_{t}) due to acceleration (a), and the front wheel force (F_{f}).
iii) the maximum acceleration if the car is FWD, and the adhesion coefficient is (m).