Control of something by electrical impulse over a wire rather tugging on a
cable-- like in the old days there was one from your gas pedal to the
butterfly in the carburetor that opened it wider when you stomped down. When
you tromp on the gas pedal these days, it sends a signal to the fuel
injector and fuel pump to step up the flow.
not on its own it doesn't. throttle position is just one of many sensor
inputs that the ecu uses to calculate injection duration. these also
air pressure - manifold
air pressure - atmosphere
throttle position is just part of the equation. if you want to check
out how the math is done, read this:
In most cars, there is still a cable that attaches to the butterfly in
the throttle body. Injector operation is controlled by the ECU based on
the airflow measured through the throttle body or manifold, and assorted
other sensors' input, rather than direct input from the pedal.
none of the above guys. drive by wire is simply having the throttle
operated by a computer controlled servo. it means there is no
mechanical connection to the pedal any more - just a sensor that acts as
input for the ecu, and the ecu uses that in conjunction with a bunch of
other info to calculate how wide to open the throttle. it's especially
advantageous for automatics as it means you can de-throttle when the
gear changes. injection really has nothing to do with it.
No,"DRIVE by wire" is electrically controlled STEERING.
You are describing "throttle by wire".
My 2003 Nissan Sentra SE-R SpecV has throttle by wire;the throttle plate is
controlled completely by the ECU. Because of some wierd problem,my RPMs
sometimes rev up to 1500-2000 RPM and hunt around there for a second,then
slowly drop back to idle,without my foot even on the gas pedal.It's caused
a CEL of "idle RPM too high".I either need a new PS pressure switch or new
programming of the ECU(according to a service bulletin),which can of course
only be done by Nissan dealers;....at some charge.
I might be able to get the reprograming done under a different safety
recall at no cost.
the steering is actuated by an electric motor that is controlled by a servo
actuator loop at the wheel. They're trying to eliminate the power steering
pump and reduce load on the engine.
IMO,not a good idea;if something glitches or fails,it WILL kill you.
There's a reason FlyByWire F-16s got the nickname "Yard Dart".
On an F-16,F-15,F/A-18,you gain a lot of maneuverability,something
important for fighter jets,but totally unnecessary for an auto.
it would not be "drive by WIRE" then.
for "drive by WIRE",the steering commands come through the wiring,not
through any mechanical linkage.
And by top posting,you destroy any logical continuity of the thread.
I agree. In airplanes (that receive continuous maintenance) it's ok but
not in cars many of which are driven by idiots or worse.
Give me a mechanical link to the function of steering, throttle and
OTOH, the L1011 is a fly by wire plane with a perfect safety record.
From Honda's website...
Drive-by-WireT Throttle SystemInstead of a mechanical linkage from the
accelerator to the fuel-injection throttle, the Accord Sedan uses
Drive-by-Wire technology. The system uses an electronic position sensor
connected to the accelerator pedal that sends an electronic signal to the
Powertrain Control Module (PCM).
You all sound like a bunch of bickering women.
"Drive by wire" is a term usurped from "fly by wire" in the first place,
used to refer to electronic steering control, throttle control,
potentially braking control (haven't seen anyone using that yet, but
it's only a matter of time), or any other electronic,
non-mechanically-interfaced control of a car's "drive" systems.
The term is used differently by different manufacturers as to which
system it's referring to, and indeed, probably refers to multiple
systems in some (throttle AND steering together, for example). Since
the meaning varies with the specific make of car, debating it here is
completely meaningless... same as debating whether the proper term is
ABS for Antilock Braking System, or ALB for Anti Lock Brakes, or any
other acronym for that type of system, which varies from one
manufacturer to the next.
Actually, I'll accept your description since the application "...by
wire" is somewhat generic with automobiles.
Anti lock brakes have been used in aircraft for a long time but again,
airplanes are subject to specific mandatory maintenance regimens.
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