Controller 2D — Control Systems/Gain Scheduling
Control_Systems/Gain_Scheduling/Controller_2D · 3 input / 1 output port(s) at insert · exports to Python, MATLAB, Java, Rust, C, C++, VHDL, Verilog, SystemVerilog, PLC Structured Text
Description#
The block's own DESCRIPTION_HTML, rendered verbatim — the same text the config dialog's info panel and the library navigator show. Fix a wrong sentence in the block's .cpp (R-D9), never here.
2D Controller
Control Systems / Gain Scheduling
The Aerospace Blockset's 2D Controller [A(v),B(v),C(v),D(v)]: a state-space controller whose four matrices are scheduled on two variables, v1 and v2. A matrix is stored for every pair of breakpoints, and between them the block blends the four around (v1, v2) bilinearly.
dx/dt = A(v)·x + B(v)·y, u = D(v)·y + C(v)·x
M(v) = (1 − f2)·[(1 − f1)·Mk1,k2 + f1·Mk1+1,k2] + f2·[(1 − f1)·Mk1,k2+1 + f1·Mk1+1,k2+1], where each variable's interval k and fraction f come from its own breakpoints exactly as in the 1D Controller. Outside its breakpoints each variable clamps: below the first it uses the first, at or above the last it uses the last.
Ports
- y – the controller input, an [m,1] column, m being the column count of the B and D matrices.
- v1 – the first scheduling variable, a scalar (the Simulink block labels it AoA).
- v2 – the second scheduling variable, a scalar (labelled Mach there).
- u – the controller output, a [p,1] column, p being the row count of one C matrix.
Parameters
- A Matrices – the n×n A matrix for every breakpoint pair, stacked
vertically with the first variable varying fastest: (1,1), (2,1), …,
(P1,1), (1,2), … – a [P1·P2·n, n]
matrix. From a MATLAB array
A(:,:,i,j)the config isreshape(permute(A,[1 3 4 2]),[],size(A,2)). - B Matrices – the n×m B matrices, stacked the same way.
- C Matrices – the p×n C matrices, stacked the same way.
- D Matrices – the p×m D matrices, stacked the same way. All zero makes the controller strictly proper.
- Breakpoints v1 – the P1 values of v1, strictly increasing, at least two.
- Breakpoints v2 – the P2 values of v2, strictly increasing, at least two.
- Initial State – x at the start of the run: a scalar for every state, or an [n,1] column. Default 0.
- Sampling Time (s) – zero or less inherits the solver's rate; a positive value runs the block at that period.
The defaults are a first-order example on a 2×2 grid; the Simulink block has no literal defaults (its dialog names workspace variables).
Code export
All ten targets: Python, MATLAB, Java, Rust, C, C++, VHDL, Verilog, SystemVerilog and PLC Structured Text. Each variable's interval and fraction come from a chain of comparisons on it, and a nested chain on the two intervals assigns the blended matrices, so the core grows with (P1−1)·(P2−1) times the matrix entries. The state integrates with forward Euler at the block's period, because the matrices move with v and there is no fixed system to discretize exactly. All ten are rendered from the one description of the arithmetic the block's own simulation runs.
The three HDL targets are simulation-only: the fractions divide by a signal
difference, so they compute in real arithmetic and quantize only at the ports.
VHDL keeps the arithmetic in a function of its own.
Simulink bridge
None (Support::None). The counterpart is aerolibschedule/2D
Controller [A(v),B(v),C(v),D(v)] in the Aerospace Blockset, and this block reproduces it
exactly – but its four matrix parameters are four-dimensional arrays, one slice per
breakpoint pair, and neither MATLAB's matrix literal syntax nor an ICore matrix config has that
form. So the schedule cannot cross in either direction; the block is reported rather than
exported without its matrices. It therefore has no parity testbench; code export verification
covers it.
Notes
- Stateful: n states. Direct feedthrough when some D matrix is nonzero, and also when the C matrices differ across the grid: u = C(v)·x then moves with v at the same instant.
- Each breakpoint search is inclusive at the bottom of each interval: a variable exactly on an interior breakpoint starts the next interval, with fraction 0.
- Linear at any instant but scheduled, so it carries no state space and model reduction reports it as unmergeable.
Code facts#
| Fact | Value |
|---|---|
| registered type | Control_Systems/Gain_Scheduling/Controller_2D |
| family | Control_Systems/Gain_Scheduling |
| solver environment class | ICoreBlock_0_Control_Systems_1_Gain_Scheduling_2_Controller_2D |
| source | src/ICoreBlocks/ICoreBlockLibrary/Blocks/Control_Systems/Gain_Scheduling/Controller_2D/ICoreBlock_0_Control_Systems_1_Gain_Scheduling_2_Controller_2D.cpp |
| header | src/ICoreBlocks/ICoreBlockLibrary/Blocks/Control_Systems/Gain_Scheduling/Controller_2D/ICoreBlock_0_Control_Systems_1_Gain_Scheduling_2_Controller_2D.h |
| default size on canvas | 150 × 100 px |
| ports at insert | 3 in, 1 out |
| code generators implemented | Python, MATLAB, Java, Rust, C, C++, VHDL, Verilog, SystemVerilog, PLC Structured Text |
Ports#
| # | Direction | Signal type | Description label |
|---|---|---|---|
| 1 | in | ICoreDouble | y |
| 2 | in | ICoreDouble | v1 |
| 3 | in | ICoreDouble | v2 |
| 4 | out | ICoreDouble | u |
Ports the constructor creates. A block whose port list changes with its configuration adds or removes ports at load time; the count above is the one a freshly inserted block has.
Configuration variables#
| Config variable | Default | Simulink parameter |
|---|---|---|
A Matrices | [-1; -2; -3; -4] | — |
B Matrices | [1; 1; 1; 1] | — |
C Matrices | [1; 1; 1; 1] | — |
D Matrices | [0; 0; 0; 0] | — |
Breakpoints v1 | [0 1] | — |
Breakpoints v2 | [0 1] | — |
Initial State | 0 | — |
Every block also carries Sampling Time (s) from ICoreBlockSolverEnvironment: zero or less inherits the solver's rate, a positive value runs the block at that period.
Simulink bridge#
| support | Support::None |
| Simulink path | — |
| port-count rule | PortsParam::None |
SampleTime parameter | yes |
Caveat (shown to the user): aerolibschedule/2D Controller [A(v),B(v),C(v),D(v)] computes exactly what this block does -- measured to 0 under ode1 -- but its four matrix parameters are FOUR-DIMENSIONAL arrays, one slice per breakpoint pair, and neither MATLAB's matrix literal syntax nor an ICore matrix config has that form. So the schedule cannot cross in either direction, and an exported model would carry the ports and no controller. Reported rather than exported to a counterpart that would be missing its matrices
Catalog contract: src/ICoreBlocks/ICoreCoder/ICoreCommandSystem/SimulinkBridge/ICoreSimulinkBlockCatalog.h
Description vs code#
The lists agree. check_block_descriptions.py finds no disagreement between the description's Ports, Parameters, Code export and Simulink bridge lists and the code's.
The verdict above is
tools/docs/check_block_descriptions.py(P7.1), which compares LISTS. It cannot read a sentence: "stateless" on a block with a state, an initial-value semantic the recursion does not implement, a "not synthesizable" caveat the HDL banner contradicts. That is the agent audit (P7.3) on BLOCK_DESCRIPTION_AUDIT.md, and this tool's green is not a substitute for one.
File banner (developer view)#
The top comment of the block's .cpp — the maths, the realization and the export strategy, addressed to whoever changes it. It must not contradict the description above (P7.5).
2D Controller [A(v),B(v),C(v),D(v)] -- a state-space controller scheduled on two variables dx/dt = A(v1,v2)x + B(v1,v2)*y u = D(v1,v2)*y + C(v1,v2)*x M(v1,v2) = (1 - f2)[(1 - f1)*M[k1,k2] + f1*M[k1+1,k2]]
- f2*[(1 - f1)*M[k1,k2+1] + f1*M[k1+1,k2+1]]
MEASURED AGAINST R2026a. The masked subsystem is one Prelookup per variable (both "Index and fraction", extrapolation CLIP, "use last breakpoint" off) feeding four copies of the Interpolate Matrix(x,y) arithmetic -- the first variable (the AoA port) is the array's THIRD dimension and the blend's INNER level, the second (Mach) the fourth and the outer -- an Integrator on B*y + A*x and an output Sum C*x + D*y. With n = 3 states, m = 2 inputs, p = 2 outputs, a 3 x 2 grid and both variables sweeping past both ends of their breakpoints, the real block under ode1 and a forward-Euler reference of exactly the program the base runs agree to EXACTLY 0 over 700 samples.
The whole program is ICoreScheduledControllerBlockBase's (../ICoreScheduledControllerSupport.h), shared with the 1D and 3D Controllers: the number of scheduling variables is a loop bound there, not a copy. This file is the ports, the configs, the description and the catalog.
NO SIMULINK BRIDGE, for the 1D Controller's reason, one dimension worse: the four matrix parameters are FOUR-dimensional arrays (M(:,:,i,j) per breakpoint pair). The configs stack the matrices vertically, the first variable fastest, and the description gives the MATLAB line that produces them.
Sample results#
The same rig also ran:
| Stimulus | What it is | Output range |
|---|---|---|
impulse | Impulse: one sample of 1 at k = 5, 0 elsewhere (Repeating Sequence Stair) | 0 … 0.0824 |
ramp | Ramp: slope 1 from t = 0 | 0 … 1.413 |
sine | Sine Wave: amplitude 1, 2 rad/s, no phase, no bias | -0.5015 … 0.2349 |
table | Repeating Sequence Stair: [-2 -1 -0.5 0 0.5 1 2 3], one entry per sample | -0.2895 … 0.4113 |
Plotted: step — Step: 0 -> 1 at t = 1 s
Category dynamic · sample time 0.1 · 60 steps · commit 93133d604 · produced by docsSample --out <folder> --blocks Gain_Scheduled_Lead_Lag Controller_1D Controller_Blend_1D Controller_2D Controller_3D Observer_Form_1D Self_Conditioned_1D Line_Of_Sight_Access Orbit_Propagator_Kepler Attitude_Dynamics Attitude_Profile_Nadir_Pointing Attitude_Profile_Geographic_Pointing Multitaper_PSD Cross_Power_Spectral_Density Transfer_Function_Estimate Envelope_Spectrum Compose_String Scan_String --steps 60 · data docs/generated/samples/Control_Systems__Gain_Scheduling__Controller_2D.json · the SVG is generated from those numbers by tools/docs/plot_svg.py, so it is a run and not a drawing (R-D10).