Limiter
Limit the range of a signal
Library
Modelica/Blocks/Nonlinear
Description
The Limiter block passes its input signal as output signal as long as the input is within the specified upper and lower limits. If this is not the case, the corresponding limits are passed as output.
The parameter homotopyType in the Advanced tab specifies the
simplified behaviour if homotopy-based initialization is used:
NoHomotopy: the actual expression with limits is usedLinear: a linear behaviour y = u is assumed (default option)UpperLimit: it is assumed that the output is stuck at the upper limit u = uMaxLowerLimit: it is assumed that the output is stuck at the lower limit u = uMin
If it is known a priori in which region the input signal will be located, this option can help a lot by removing one strong nonlinearity from the initialization problem.
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_uMax | uMax | Upper limits of input signals | Scalar | |
mo_uMin | uMin | Lower limits of input signals | Scalar | |
mo_homotopyType | homotopyType | Simplified model for homotopy-based initialization | Structure | |
mo_homotopyType/choice1 | Homotopy is not used | Number | 0 | |
mo_homotopyType/choice2 | Simplified model without limits | Number | 0 | |
mo_homotopyType/choice3 | Simplified model fixed at upper limit | Number | 0 | |
mo_homotopyType/choice4 | Simplified model fixed at lower limit | Number | 0 |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_strict | strict | = true, if strict limits with noEvent(..) | Scalar | true |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_limitsAtInit | limitsAtInit | Has no longer an effect and is only kept for backwards compatibility (the implementation uses now the homotopy operator) | Scalar | true |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_u | u | u | Structure | |
mo_u/fixed | fixed | Cell of scalars | true | |
mo_u/start | start | Cell of scalars | ||
mo_y | y | y | Structure | |
mo_y/fixed | fixed | Cell of scalars | true | |
mo_y/start | start | Cell of scalars |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
u | implicit | Connector of Real input signal | input | 1 |
y | implicit | Connector of Real output signal | output | 1 |