Environmental Engineering Reference
In-Depth Information
Transmissions designed for neutral idle function can gain as much as 2 points
in overall efficiency by not having a slipping torque converter. Neutral idle is also
employed during vehicle braking so that the engine is now working against a par-
tially stalled transmission. The input clutch is the first clutch on the transmission
input shaft that is tied directly to the torque converter turbine in the Wilson and
Lepelletier architectures. The various transmission configurations are discussed
further in Chapter 4.
3.7 Exercises
Q1:
Using data from Table 3.1 calculate the maximum steady speed that the
2010 Camaro can sustain on a 6% up-grade into a 20mph headwind with four
occupants. Compare this answer to that of Chapter 2 for the Camry Hybrid.
A1:
Solve the equation shown here to get
V
= 75.755 m/s (169mph):
V
3
þ
26
:
82
V
2
þ
3
;
848
:
2
V
880
;
172
¼
0
Q2:
Using the procedure in Example 5 calculate the stopping distance of the 2010
Camaro SS of Q1 above travelling 65mph on level terrain and no headwind.
A2:
50.2 m (165.16 ft)
Q3:
The Mercury Mariner hybrid SUV has provision for emergency recharging
its on-board 300 V NiMH battery pack in case of long term standby without
the vehicle being used. In this case the 1.65 kWh NiMH pack is discharged
and cannot crank the engine. What rating dc/dc converter between the HV
traction battery and the LV auxiliary battery (14 V) must be used to charge
this pack sufficiently in 8min from the auxiliary battery?
Hint:
The dc/dc converter input current limit is set at 100 A
dc
and is 92% efficient.
A3:
Approximately 1.4 kW rating
Q4:
For the dc/dc converter and auxiliary battery source mentioned in Q3,
(a) what amount of energy is transferred to the main traction battery and
(b) what percentage SOC does this represent?
A4:
(a) 556,416 J (154.6 Wh); (b) 9.4%
References
1. Gradshteyn I.S., Ryzhik I.M.
Table of Integrals, Series, and Products
, 6th
edn., New York: Academic Press, 2000.
2. Continental Group technology demonstration days, Pontiac, MI, September
2001.
3. Courtright, G. 'Case study of the applicability of applying real-time data
acquisition and monitoring of hybridized powertrains'. Presented at the
Global Powertrain Conference, Advanced Propulsion Systems, Ann Arbor,
MI, 23-26 September 2002.
