I have created a hydraulic hybrid system in simscape. The model is running smoothly without any errors but the engine block is not giving any power or rpm even at full throttle, hence all the scopes are showing zero reading or close to it. What to do

The control system designed uses drive cycle block as input to calculate the torque required by the engine and the displacement of the regeneration pump/motor and master pump at various stages of the drive cycle. ODE23 is the solver configuration im using.

[Sebastian Castro]

Without any results / error messages / model screenshots, it would be really difficult for any of us to give you a good answer.

A common reason for seeing all zeros in Simscape results is that Motion/Force/Torque sensors are connected in the "wrong" way (series vs. parallel).

Force and Torque sensors should be connected in series, as they have zero "resistance". Motion sensors should be connected in parallel, as they have infinite "resistances". Doing it the other way will immediately stop all forces/torques from flowing through your system.

- Sebastian

[Kartik Khanna]

the force and torque sensors are in the correct position, here are the screen shots.

<<

<<

>>

>>

[Kartik Khanna]

<<

>>

[Kartik Khanna]

<<

>>

[Kartik Khanna]

[Sebastian Castro]

So you have a SimDriveline engine, a hydrostatic transmission model, and a vehicle. That's a lot of places where this could go wrong.

Have you tried testing each component individually, or slowly removing things from your model? It might help you isolate the problem.

[Kartik Khanna]

Ok i'll try,Thanks

[Eric Money]

Personally on models this big I prefer to just build my own engine component using a torque+fuel curves, a PID, some linear interpolation, and an ideal torque source. It takes a bit more leg work but seems to generally produce a faster model. With that said, if this is the first you've used a lot of the smaller subsystems in the model (i.e. have you made an isolated/simpler version of your pressure release, engine control, pump loop, etc.) then I'd suggest going back and building a couple simpler systems and then once you've verified those, pull them into the larger system.

Answer 1

[Martin]

Does the engine start at no speed? It could be that it is stalling. Start the engine at a higher speed, or add external torque to simulation a starter motor.