startup.md

Startup procedure

Initialization the hardware

• lowlevel init hardware
  • adc
  • spi
  • can network init
  • board init
  • sensor init
  • board read inputs (measure vBat, offset (shunt) and set board status ok/nok)

Calibration

• bring cj125 into calibration mode
  • wait 500ms
  • check cj125 status
• read calibration values
  • Ua (lambda value)
  • Ur (reference heater value, lower values means hoter heater)

Running

• bring cj125 into running mode, amplifacation 8
  • wait 500ms
  • check cj125 status
  • set sensor status to evap startup (pre heating at 1.5v for some time)
• init timer with 1ms

From now on the while loop is running and scheduler is active

10ms task

• if sensor status is running
  • read Ua, calculate the whole stuff (lambda, O2, ...)
• if sensor status is evap startup
  • NOP
• always
  • send CAN message with actual values (check DBC file)

25ms task

• nothing to do

50ms task

• nothing to do

100ms task

• if sensor status is running
  • read Ur
  • adjust pid
• if sensor status is warm up
  • increase the heater voltage

Status transitions and actions

• reset --> evap startup
  • set heater voltage to 1.5v
• evap startup --> warming up
  • set heater voltage to 8.5v
  • ramp up heater voltage from 8.5v to 13v with maximum ramp up rate of 0.4v/s
• warming up --> running
  • activate heater pid control
• running --> error
  • shutdown heater