Main difference between open loop and closed loop boost control:
Open loop boost control
Open loop boost control applies a fixed duty cycle based on tables (e.g., throttle and RPM), without measuring actual boost pressure. There is no feedback, so it cannot correct for changes in temperature, altitude, or engine load.
Closed loop boost control
Closed loop boost control uses a feedback system. It continuously compares the actual boost pressure to the target and adjusts the solenoid duty using a PID algorithm to minimize the difference. This makes it more precise and adaptive.
Open loop = fixed output, no feedback.
Closed loop = dynamic adjustment based on feedback.
