OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
South Africa were also considered while making the changes to the previous model. A detailed comparison is
made in the following sections.
2.1 Electrical System
2.1.1 Rogue
The battery pack consisting 8 number of Lead acid batteries (pure lead tin type) each of 12V, 42 Ah rating
connected in series was used in Rogue(’08). Each battery weighed 13 kg, thus giving a total weight of 104 kg.
Solar panels of monocrystalline PM84 series by MoserBaer, with efficiency of 16% and rated voltage and
current as 0.6V and 5.5A respectively, were employed. Eight panels with 36 cells each were used on top of the
vehicle giving a total output power of 674 watts.
2.1.2 Avenir
4 batteries of conventional lead acid type with a configuration of 12V, 33 Ah were used in order to make the
battery pack with 48V rated voltage. Each battery with a weight of 20kg made a total weight of 80 kg of the
battery pack, thus decreasing the total weight of the vehicle. Solar panels of polycrystalline cells I6MU series by
IndoSolar with an efficiency of 16.66% and rated voltage and current as 0.6V and 7.7A respectively were used.
It had a rated power of 4 watts. Four panels of 60 cells each were used on top of the vehicle giving a total power
of 960 Watts. The frame was also eliminated from the panels and a rubber coating was used to absorb the shocks
on edges and corners, thus reducing the weight of the panels. A brushless DC hub motor was used instead of a
separately excited motor connected through chain transmission thus reducing the losses.
2.2 Mechanical Systems
2.2.1 Rogue
The chassis of the SEV was made of Aluminium 6063 alloy extrudes after stress analysis on ProE software. The
analysis showed that the chassis could bear 1.5 times the normal estimated weight of the car. The total weight of
the chassis was measured to be around 54kg.Front suspension of MacPherson strut type had been used, with a
trailing arm suspension on the rear. Single reduction chain and sprocket type system with gear reduction ratio of
6.5:1 transmitted the power from the motor to the rear wheel.
2.2.2 Avenir
The chassis made of HINDALCO-aluminium 63400 alloy weighed around 50kg. Stress analysis of the chassis
on SolidWorks 2010 revealed that a total load equal to 2.3 times the estimated weight of the car could be borne
by the chassis. Double A-Arm type suspension was used on the front as it provides better control. The
suspension was designed so that it improved the ride quality and reduced tire wear considerably.
Fig.1. Energy Flow Diagram of Avenir-2011
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