Dead band a

Type Function module

Input X	REAL (input)
T	TIME (time delay of the lowpass)
KL	REAL (gain of the filter)
LM	REAL (maximum value of the HF amplitude)
Output Y	REAL (output value)
L	REAL (amplitude of high frequency)
	DEAD_BAND_A is a self adapting linear transfer function with dead zone. The function moves the positive part of the curve to -L and the negative part of the curve by +L. DEAD_BAND_A is used to filter the noise components at the origin of a signal. DEAD_BAND_A, for example, used in control systems in order to prevent that the controller permanently switches in small increments, while the actuator is overstressed and worn out.
	The size L is calculated by filtering the HF cpmponents of the input signal X using a low pass with time constant T and the dead zone L calculated from the amplitude of the HF portion. The sensitivity of the device can be changed via the parameter KL. KL is predefined to 1 and can be unconnected. Reasonable values for KL are between 1 - 5.
	L = HF_Amplitude(effective) *KL.
	So that the module will remain stable even under extreme operating conditions, the input LM is limited by of the maximum value of L.
	DEAD_BAND = X - SGN(X)*L if ABS(X)> L if ABS(X) > L
	DEAD_BAND = 0 if ABS(X) <= L