16-03-2012, 04:17 PM
Powertrain Matching
powertrainm.ppt (Size: 396.5 KB / Downloads: 120)
What is Powertrain Matching?
Selecting the right engine and gearing for a given application
Not just performance, but giving the driver the expected response to pedal inputs
In automotive applications delves deeper into transmission shift schedules as fuel economy is heavily impacted
The Beginning
Driver pushes on Pedal to move vehicle
Pedal formerly known as Gas Pedal, and before that, Accelerator Pedal
Driver Intent
Driver Intent is essentially acceleration rate (+ or -)
Since pedal position is related to driver intent, pedal position is related to desired vehicle acceleration.
Powertrain Control Example
Example: minimize fuel consumption at a driver commanded power level
pedal position indicates driver wants 100 hp delivered (based on power required vs. pedal position and vehicle speed)
need to find engine speed and MAP (throttle position) for best fuel consumption
assume Electronic Throttle Control