Rotary Racer - Car Performance

Castle Combe 2008-06-22

Results

We won !

Car Computer Log

This shows the main items measured by the Rotary Racers car computer. They are:

Item Description
Throttle The position of the twist grip throttle from 0 to 100%
MotorControl The motor power output setting. The Car computer sets the motor speed based on the drivers throttle position, the speed of the car and the current being used. There is a software algorithm to implement this "drive by wire" system. The Car computer drives the PWM (Pulse Width Modulation) Motor Speed controller with a duty cycle proportional to this value. 0 - 100%
Speed The speed of the car in Km/H calculated from the magnetic read switch pulse generator by the Car Computer.
Voltage The batteries voltage under load.
Current The current being taken from the batteries.
Charge0 The charge left in the battery pack 0. This is calculated by the car computer using an algorithm that has been honed to match the battery discharge curves for the Yuassa batteries. It currently bases its results on the current being used from the battery.
Charge1 The charge left in the battery pack 1. This is calculated by the car computer using an algorithm that has been honed to match the battery discharge curves for the Yuassa batteries. It currently bases its results on the current being used from the battery.
BatPack The battery pack in use (0 or 1). We have changed the driver with each battery pack change.


The graphs show the overall data, the actual ASCII data log files are also available, from the links below, for detailed analysis.

Car Data Log

Practice Laps Data

Car Data

Battery Voltages

These are the battery voltages measured with a multimeter at the end of each change. The readings were taken as soon as posible after the batteries we placed back in the battery area.

Battery Pack BatA BatB
0 12.40 12.41
1 12.46 12.47
0 12.16 12.26
1 12.20 12.21
0 11.80 11.90
1 11.96 11.98

Notes