Plotting an Array in Simulink with the Simulation time on X-Axis

Hello Guys,

I'd be really thankful if somebody would answer my question.

I am working on a project in my college where I need to build different subsystems simulating an electric car on Simulink. Subsystems such as "Wheel" , "Gearbox" , "Electric Engine" , "Battery" etc. and in the end I should be connecting them all together and start getting my values. The very first subsystem is called " Cycle " and In this subsystem I must use my given variable "V" which is the speed of the car. V is an array with 1800 rows and 1 column stating the speed of the car in KM/H for every second for 1800 seconds (30 Min Total). (It's all about the WLTP Car Test where a Car will be accelerated and deccelerated for 30 Min continious). My very first substem "Cycle" should plot a graph with this speed according to the simulation time ( What I understood I'll change the simulation time to 1800 Seconds and I need to get V drawn for every second up to 1800 seconds so the graph with be plotted) . My second Subsystem will be "Wheel". Wheel should be able to calculate my Wheel RPM and my Wheel Toque using the Speed graph (Speed array) from my first subsystem "Cycle". I have spent already 10 Hours playing around Matlab and Simulink to get an idea of how to start but I failed. Does anybody have a solution? I am really thankful.

Kind Regards

Answer 1

[Viren Gupta]

Hi,

For giving the input as an array (1800*1), you can directly set the Input parameter in Data imprt/Export parameter as [t,u]. Make sure you have t and u present in the workspace as 1800*1 vectors. t will be time based vector as [1;2;3....1800] and u will the speed vector. For graph, you can use the scope block. You other subsystems like Wheel should be able to use the same inputs.

[Abdelrahman Alamoudi]

Hi,

Thanks a lot for your Answer but would you please explain this more in details? In my Workspace I have t as (1800*1) and v as (1800*1) vectors. Now I'll open Simulink and from the Toolbar I'll go to Simulation then to Model configuration parameters and then I guess under "Load from Workspace" is Input [t,u] I should be changing it to [cycle.t , cycle.v] because my t and v are under Cycle in my Workspace. Now in my Block window, which Block should I be connecting to Scope to get the graph? When I use the Input block how do I change the variables inside it to v and t ? How many plugs should the scope have? Thanks for your help.

[Viren Gupta]

You can use the in1 block. This needs to be connected to the scope. Now yoy should be able to run the model and see the graph in scope block.