During the week 6, group N conducted one of the advanced research, coasting and power braking. Braking is an important component in AEV project. In this lab, two ways of braking are available for the AEV- coasting and power braking. Coasting refers to switching off the motors so that the AEV could gradually slow down the speed until it stops completely. Instead of cutting off the power of the motors, power braking reverses the direction of the motors so an opposing force is applied on AEV to help it stop. Two main factors are taken into account when testing these two methods, energy consumption and braking distance. Group N prepared two codes and conducted a series of testing for each method to determine which style suits group N’s AEV most.
Coasting:
Average Coasting distance:
133.235 (in)
Expected Percentage of Trials that Fall within a 3-inch Margin of the Average:
89.89 (%)
Average Energy Consumed:
26.934 (J)
Power Braking:
Average Power Braking Distance:
123.338 (in)
Expected Percentage of Trials that Fall within a 3-inch Margin of the Average:
93.12 (%)
Average Energy Consumed:
39.125 (J)
260 grams:
Average Coasting distance:
133.235 (in)
Expected Percentage of Trials that Fall within a 3-inch Margin of the Average:
89.89 (%)
Average Energy Consumed:
26.934 (J)
293 grams:
Average Coasting distance:
127.573 (in)
Expected Percentage of Trials that Fall within a 3-inch Margin of the Average:
74.17 (%)
Average Energy Consumed:
26.499 (J)
Coasting vs Power Braking:
- Coasting Consumes about 33% less energy than Power Braking
- Coasting traveled an extra 10 inches on average (at the same weight: 260 g)
- Power Braking increases braking accuracy
Coasting AEV Weight Comparison:
- Increasing weight was found to decrease the coasting distance accuracy.
- Research needs to conducted for coasting accuracy of AEV weights under 260 grams
Errors:
- Battery was not changed for power braking tests
- Small power impulsion happened during braking
process of coasting test 1-2.
Future Research:
- Accuracy of Coasting Distance for Light AEV’s
- Accuracy and Energy Consumption for Combined Coasting and Power Braking
- Accuracy of Reflectance Sensor at Various Speeds
Citation:
Advanced R&D: https://osu.app.box.com/s/8qetsj0dtopzr1m0zljcyaj5fio3c33x