Re: Automatic Transmission Drag Kills Stop and Go Gas Mileage
(1) would be easy enough -- light throttle application would give a properly
designed torque converter (i.e., one designed for releasing into a
free-wheeling mode while stopped and for re-engaging smoothly) ample
opportunity to gently re-engage with nothing more than a light shift
sensation such as any other upshift sensation might create.
(2) would be easy with drive-by-wire. Giving the computer full control of
the vehicle lets the manufacturer design in behaviors they couldn't
otherwise. With the computer in full control of the throttle, the driver
flooring it from a standstill would cause the torque converter to re-engage
as quickly as it is designed to re-engage -- at whatever throttle opening
the computer deems reasonable -- followed by the computer ordering a rapid
opening of the throttle to fully open. With drive-by-wire, competent
programming and a competent transmission, this could be done amazingly fast.
I guess he had a more workable idea than you would have guessed...
"Bill Putney" <email@example.com> wrote in message
> Nomen Nescio wrote:
> Sorry for feeding the troll, but I challenge anyone to design a tranny
> control algorithm for re-engagement following the
> complete-dropout-at-idle that can adequately handle *both* of the
> following to the satisfaction of the consumer:
> (1) A smooth start with light application of throttle for gradual old
> lady takeoff from stopped,
> (2) A sudden pedal-to-the-floor start without effectively simulating a
> high rev. neutral drop.
> Bill Putney
> (To reply by e-mail, replace the last letter of the alphabet in my
> address with the letter 'x')