Subpage of Round

PID Control loops

• The PID control loop feedback signal can be chosen from several input sources ( analog, temperature, rpm, lambda, etc).
• The dialog is named "Boostcontrol" (after the first such application).
• Round V1 has only 1 PWM output pin named "boost-out".
• Round V2 has altogether 3 independent controllers, driving 3 independent PWM output (boost-out, PWM0 out, PWM4 out)
• For PID controller settings see: Boost/Idle/Lambda settings
• Example Nr.:1 : Woodgas temperature control on Egt input
  • The target parameters : 650 Celsius -> 95%PWM duty cycle, 700Celsius -> 80% DC with 33 seconds period time, minimum DC is 80% maximum DC is 100%
  • Steps:
    1. Choose control unit: PWM 0,4 have configurable period, use PWM0
    2. Limit Duty cycle: set PWM0 min and max duty
    3. Select input source: Egt target
    4. Set target, reference DC and PID parameters
    5. Set Period time (note: PWM DC refresh on period ends)
• Example Nr.:2 : Woodgas temperature control on Analog input
  • The target parameters : 650 Celsius -> 5%PWM duty cycle, 700Celsius -> 15% DC with 33seconds period time, minimum DC is 0% maximum DC is 20%
  • note: this example is the same as above with different hardware settings
  • Steps:
    1. Need hardware converter from temperature sensor to analog ( Egt amplifier ) -> 650C -> 2.71V ; 700C -> 2.91V
    2. Choose control unit: PWM 0,4 have configurable period, use PWM4
    3. Limit Duty cycle: set PWM4 min and max duty
    4. Select input source: Analog 2 target
    5. Set target, reference DC and PID parameters
    6. Set analog 2 input curve and analog input calibration, offset
    7. Set Period time (note: PWM DC refresh on period ends)