Originally posted by jeffster
Okay, I know what a drive-by-wire system is, but what actual benefit does the MDX's dire-by-wire throttle deliver?
#1 Makes throttle response feel snappier. The amount of pressure your foot/ accelerator linkage puts on a throttle cable is not linear. Further, the angle/percentage opened of the air-valve may not be linear. Drive-by-wire/electronic throttle fixes that. Every extra "push" results in more "go".
#2 Shifting. The throttle can be eased for a FRACTION of a second as the RPMs hit the tranny's shift point. This makes the wear& tear on the tranny significant;y reduced. It allows for a bit more MPG (as the shift completes quicker) and ensures that the shifting in general feels more solid.
#3 VSC. Without electronic throttle control the VSC would need a secondary means of controlling the throttle. By using a single control method the VSC can respond quicker and more smoothly.
#4 VTM. By coordinating info from the VTM into the electronic throttle control there is a smoother transfer of power. Should make the already very smooth VTM all but invisible
#5 Idle. By employing electronic throttle control there is a greater range of idle speeds. May help for faster warm-up, reduced emissions.
#6 Data. It is much easier to use the electronic throttle control as in input to the adaptive ECM's "block learn" mode. It can measure/compute "velocity delta" for the accelerator pedal and determine when the driver is "stomping on it" versus heading up a hill. The sensors that measure throttle input are pretty simple, but when combined with a high sampling rate/clock info such correlations are easy. Much more costly/complicated to do this with inertial sensors and such.
There may be others, this from info I have gleaned from a few google searches...