Hysteresisregelingen

Hysteresisregelingen, often translated as hysteresis control or deadband control, are a type of control system that uses a deadband or hysteresis to prevent rapid switching of an actuator. This deadband is a range around the setpoint where the controller does not change the output state. For example, in a heating system, a hysteresis controller might turn on the heater when the temperature drops below a certain point (e.g., 20°C) and turn it off when it rises above another point (e.g., 22°C). The difference between these two points (2°C in this example) is the hysteresis.

The primary benefit of hysteresis control is to reduce wear and tear on mechanical components such as relays, contactors, or valves. Without hysteresis, even small fluctuations around the setpoint would cause the actuator to switch on and off continuously, leading to premature failure. By introducing a deadband, the controller allows for a certain degree of deviation from the setpoint before an action is taken, thereby stabilizing the system and extending the lifespan of its components.

Hysteresis controllers are commonly found in applications where precise, immediate responses are not critical, but stability and longevity of equipment are important. Examples include thermostats for heating and cooling systems, water level controllers in tanks, and simple pressure regulators. While they offer simplicity and robustness, hysteresis control can lead to a wider fluctuation of the controlled variable compared to more sophisticated control methods like PID control, which aim for tighter regulation around the setpoint. The choice between hysteresis control and other methods depends on the specific requirements of the application, balancing factors like control accuracy, component longevity, and system complexity.