Hillsborough Community College Races

Race 1 (September 24, 2016)

Race 1 First 13 laps.

Video from Contour Camera. Data from AIM EVO 4. Data display by Race Renderer 3.

The track map is in the upper left hand corner. It is created from the GPS data. The timing line is not at the same place as the official Start/Finish line, so lap times differ slightly from official times.

Next to the track map is the G-force display. This is the lateral and longitudinal forces acting on the car as it turns, accelerates and brakes.

Upper right corner includes a Speedometer from GPS data. The lap count and time is for the current lap but displays for 10 seconds after the end of the lap for easy reading.

The two numbers display under lap time are the results for the current lap. In the race, the driver can not see these figures until the end of the lap when they are calculated. For the video, we are displaying this information during the lap to help the viewer understand whether it is an effective lap or not.

The 'Miles' number is the number of miles the race vehicle would cover if every lap was driven exactly the same as the current lap. This is calculated against both the 60 minute limit and the battery capacity limit. This gives the driver a way to compare a slower lap that uses less energy and a faster lap that uses more energy against the ultimate goal of covering as much distance as possible in the time allotted.

The 'Whrs' number is the average Watt Hours used this lap. The battery pack capacity is 945 Watt hours. Any lap under that amount, the driver is not using as much energy as available. Any lap over that, the driver is using more energy than the pack can sustain for an hour.

The driver sees these numbers on the Driver Displays Unit (DDU) while racing. The DDU also tracks energy remaining and calculates whether there is enough energy to finish the race based on the speed and power usage of the last lap. This check is displayed as a simple green, yellow, red background color.

The displays on the bottom of the screen are, on the right, Watt hours going from battery pack to motor. On the left, Watt hours being consumed overcoming aero drag and rolling resistance and motor inefficiencies. This is calculated by looking at changes in kinetic energy. This information helps display how driving technique influences power usage. You might also notice that the uphill sections consume more energy than the downhill.

At the end of lap 12, the chain from motor to rear wheel comes off. We are running a 114 tooth gear to keep RPM high where it is most efficient on this motor. The large diameter of the gear and the lateral loads created too much movement. We remounted the chain and ran another 15 laps before it came off again.

For the second race, we used a smaller 77 tooth gear and completed 66 laps before the rear tire wore through. The camera mount glue melted in the Florida sun, so we were unable to collect video.

Simmons Dec, 2015
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