The most accurate way to consider engine braking torque during deceleration phases includes the consideration of engine torque maps. Besides delivering torque characteristics, these maps also provide trailering torque. In the simulation it should be considered. that the actual engine operation point and the gear ratios play major roles. During deceleration phases, some engines cut-off fuel injection, but other types still operate with a certain idle fuel injection, so that the engine braking torque is lower. In addition, the engine torque at crankshaft has to be transmitted under consideration of the actual total gear ratio. Automated transmission has different characteristics than manunal transmission.

Here is a publication, that might be of interest:

https://www.researchgate.net/publication/280303367_Basics_of_longitudinal_vehicle_dynamics

Kind regards,

Mario

Conference Paper Basics of longitudinal vehicle dynamics

Thanks very much Mario. That was very helpful.

Hello Mario good morning. Sequel to your advice, I have been able to come up with the following plots as estimations for my engine braking force curve. Are these correct?

Thanks in anticipation to your response.

Regards,

Wisdom Enang.