- #1
Zain Abbasi
- 2
- 0
Hello Everyone,
I am designing Simulink model for HIL testing. Basic concept:
Input: Throttle angle ----> Injection timing from that I have calculated requested torque (% of max torque)(chekced and correct)
Real torque follows requested torque with delay. (long list of conditions depending on engine design and parameters)
Total torque = Real torque - Internal friction torque (bmep = imep - tfmep)
Now this is the toque I have at crankshaft.
My question
a) Is it correct approach if I integrate this torque and divide it by engine inertia to find engine angular speed. (Torque = Inertia*angular accelaration)?
Consideration: If I do that it would mean that my engine rpm is independant on external load and only on torque request, which is obviously not the case.
b) External loads are calculated using coast down coefficients and gearbox, differential ratio and transmission efficiency. I feel the correct approach would be to create a close loop and subtract external loads from torque transmitted by flywheel and then integrate it to find rpm.
Any suggestions?
Thanks
I am designing Simulink model for HIL testing. Basic concept:
Input: Throttle angle ----> Injection timing from that I have calculated requested torque (% of max torque)(chekced and correct)
Real torque follows requested torque with delay. (long list of conditions depending on engine design and parameters)
Total torque = Real torque - Internal friction torque (bmep = imep - tfmep)
Now this is the toque I have at crankshaft.
My question
a) Is it correct approach if I integrate this torque and divide it by engine inertia to find engine angular speed. (Torque = Inertia*angular accelaration)?
Consideration: If I do that it would mean that my engine rpm is independant on external load and only on torque request, which is obviously not the case.
b) External loads are calculated using coast down coefficients and gearbox, differential ratio and transmission efficiency. I feel the correct approach would be to create a close loop and subtract external loads from torque transmitted by flywheel and then integrate it to find rpm.
Any suggestions?
Thanks
Last edited: