SimDriveline Generic Engine Parameterizaiton

I have a working basic driveline model using defualt settings for the engine. Now i want to change the settings to the engine I need to use. I have the parameters in the form of a torque table. I am finding that it does not work. My engine stalls just after throttle is applied. I have used the same torque curve information in the Normalised 3rd order polynomial parameterisation and it works. However I wish to use my own tabulated data rather than the polynomial. As a sanity check I worked out the tabulated data for the default normalised data and used that, but this also stalled. I have looked at the default tabulated data, and this looks nothing like the normalised polynomial data.

The Parameters I have used that works are: type: Diesel Max Power: 155508.8 W Speed at Max Power: 4500 rpm Max Speed: 7000 rpm Stall Speed: 200 rpm

The tabulated torque data I have worked out and used from the above (and doesn't work) is as follows: Speed: [200 500 1000 1500 2000 2500 3000 35000 4000 4500 5000 5500 6000 6500 7000] rpm Torque: [1 5 21 53 101 164 237 315 331 330 271 200 124 54 4] Nm

Am I perhaps misunderstanding what the Tabulated data is supposed to represent? I thought that they should be the same?

Thanks

Chris

[Saif Sayed]

Hi, were you able to solve this problem? I'm facing similar issues with my torque vector. With my torque vector Simscape gave me an error that the vector should only be in ascending order so I even tried entering the power vector but the engine did not give any power here too.

Answer 1

[Deepak]

I am facing the similar problem. If the engine power is approximated by 3rd degree polynomial, engine produces power and it does not stall. However, if the engine is approximated with tabular data it stall. I am using 800rpm as initial velocity. The initial velocity goes down to zero and engine revs up after that although the throttle is active.

Please help!

Answer 2

[Christopher Cook]

I have not been able to do much work on this until now. Looking in more detail I realise that the tabulated data i worked out is not the same as the default tabulated data. However, these don't seem very believable as they achieve nearly 400Nm torque at stall speed!

When I use a genuine tabulated engine torque curve and also change the reverse engine map in the thottle control so that they match, I no lnoger get the stalling problem. I have other problems such as too high engine speeds, but thats probably a different problem.