True enough, but if it is assumed that the lock-up clutch is engaged, the math holds. And if not, the particular torque converter speed ratio values can be applied to give "close enough" DWRPMs.If the vehicle has an automatic gearbox, the associated torque converter (used instead of a clutch) will make the calculation impossible.
(My emphasis).Please suggest me the formula conversion from engine speed to vehicle speed. What are all the factors I need to consider while doing the conversion.
Nigel, you and I differ, apparently, on interpreting the OP's requested information .Of course this thread is particularly pointless, as this isn't how measure speed
As we all know you measure wheel rotation, either directly at one of the wheels, on the propshaft/drive shaft, or most common the output shaft in the gear box.
And what would be the point? - far easier to do it the way it's always been done.Using engine speed is a valid method for determining engine speed for a car with manual transmission albeit more complicated.
It just requires a circuit to provide the proper conversion factor for each gear (and indicate zero or indeterminate speed when the car is not in gear and/or the clutch is not engaged, perhaps after a suitable pause to allow time for a shift).
I believe some modern cars use the ABS sensors to detect the speed?.Since the advent of the electric automobile where now often there is a traction motor on each wheel, it has to be done at the wheel level in order to detect wheel slip or maintain synchronism, locomotives have done it for many decades.
I think it is all, or nearly all, that do that now.I believe some modern cars use the ABS sensors to detect the speed?.