Instrumentation

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Contents

EVision

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EVision Bench Test Setup
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Brusa Shunt Measurement Board

Vehicle Speed

The Simovert provides a motor speed output, 5000Hz at 10000rpm. This can be adjusted by a configurable factor f_out_factor. The EVision & the Simovert share a ground, so this output can be directly connected to the EVision's speed input.


Current settings:

  • f_out_factor = 2
  • sensor count per rotation = 11
  • tyre diameter = 498mm

The above gives 7031 pulses per km.


Speedometer/Odometer

The gearbox speedo output interferes with the body, so I need to drive the speedometer and odometer from the Simovert's output. I can either drive the speedo with a motor or replace it with an electronic one.

Mitsubishi FTO Speedometer

CAN Bus

OLPC SocketCAN

Fuses

The EVision is connected to the pack by 3 wires, these need 50mA fuses. My options seem quite limited here. After quite a lot of searching I found the Bussman FWH-.500A6F which is UL Rated to 500V DC. At US$18 each I'm not so happy. Can be had cheaper at Online Components. (wrong current). Can probably use http://jaycar.co.nz/productView.asp?ID=SZ2014 with a lower voltage pack.

10000 RPM Data Acquisition

Note, this was taken with the shunt incorrectly configured, double all the current readings

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EVision captured data from 10000rpm run of motor
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EVision captured data from 10000rpm run of motor
grep \\\$IV 10000rpm.csv |cut -d , -f 4- |tr , " " >data.dat
gnuplot
set terminal png
set output "10000rpm-1.png"
plot "data.dat" using 1:2 title "voltage", "data.dat" using 1:4 title "charge current", "data.dat" using 1:5 title "discharge current"
set output "10000rpm-2.png"
plot "data.dat" using 1:6 title "power"
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