Automotive Engineering II

Student Name:                                                                     Student Class Number:

 

1- A) Complete the following table:

	Meaning	Cause	Effect
Wheel lockup
Transferred weight

B) Explain what is meant by:

i- Brake factor (BF)

 

 

 

ii- Brake hydraulic advantage (HA)

 

 

 

iii- The car track (t)

 

 

 

C) What are the functions of the following?

i- Piston seal of disc brake

 

 

 

 

ii- Compensation port in the master cylinder

 

 

 

D) When the brake pedal push rod force (F_c) is 1500 N, the booster push rod applied (F_m) 2500 N to the master cylinder, Find:

i- The booster force (F_b), and booster characteristics (B)

 

 

 

 

ii The wheel cylinder pressure (p), if the wheel cylinder area (A_w) is 1200 mm², and master cylinder area (A_m) is 500 mm².

 

 

 

3- A RWD truck weight (W) 20,000 N, its center of gravity located 2.4 m in front of the rear axle (x₂) and 1.0 m above the ground (h). The truck wheel base is 3.2 m. The truck is moving with a constant velocity of 108 km/h. Find:

a) The truck kinetic Energy (KE).

 

 

 

 

 

b) The Front axle’s reaction (R_f).

 

 

 

 

 

 

c) The total braking force F_b, if the brake causes the truck to decelerate by (a) 2 m/s².

 

 

 

 

 

 

 

d) Find the new center of gravity “CG” if the truck is carrying a load of 3,000 N. where the CG of the load is above the rear axle.

 

 

 

 

 

 

 

e) Draw the FBD of the truck when it is going up a gradient with an angle (q), with an acceleration (a).