honda pgm motor cycle histories

honda pgm motor cycle histories


Honda started more than 20
years ago to develope a FI
system to constantly provide
the optimum air fuel ratio
required by the engine using
electronic control techniques.
Since then, Honda has been
actively promoting the
application of FI to
motorcycles as a technique to
realize environmental
performance and high level
driveability.

In 1982, Honda marketed the
first-in-the-world, fuel injected
motorcycle CX500TURBO,
which attained both better
acceleration performance
than the CB900F and better
fuel economy than the base
model CX500. In 1998, the
environmentally friendly sport
tourer model VFR800FI was
marketed. This model, using
the PGM-FI and the newly
developed three-way catalyst,
attains 1/30 CO emissions and
1/10 HC+NOx emissions from
the EURO1, which is the
European exhaust emission
regulation enacted in 1999.
And now, the racing machine
"RC211V" has been
dominating the MotoGP races.

The "RC211V" uses the PGM-
FI, which aids in allowing the
overwhelming power output of
the RC211V to be controlled
for efficient use by the rider.
Honda always keeps improving
the fuel injection system at
the highest level of technical
competition.
The first motorcycle equipped
with an electronic fuel
injection - CX500TURBO
In the late 1970's, Honda R&D
was filled with enthusiasm
towards attaining "core
technologies that would lead
to the development of new
technologies in the 1980's".
Through discussions on what
should be the core
technologies, "turbo charging"
was choosen, and the CX500
was selected as the base
model. Honda defined the
purpose of "turbo charging"
not merely as a boost of extra
power output from a large
displacement engine, but an
increase of specific power
from a small displacement
engine, and an increase in
thermal efficiency by reducing
the frictional losses per
output. Simply stated, it was
to attain both an increase in
power output and a reduction
in energy loss. Most critical in
the development were the
turbo charger and the fuel
injection control systems.

The
CX500TURBO eventually made
the first step of innovation
into the 1980's with its
acceleration performance
better than the "CB900F" and
fuel economy better than the
base model "CX500".
Computer controlled fuel
injection
One of the features of the
CX500TURBO was the
practical application of the
computer controlled fuel
injection system. Instead of
using the then-conventional
air flow meter, the computer-
controlled fuel injection
system calculated the
injection volume using the two
control maps, i.e., one for the
boost zone where the basic
injection volume was
determined by the engine
revolutions and the boost
pressure, and the other for
the throttle zone where the
basic injection volume was
determined by the engine
revolutions and the throttle
opening. The actual injection
volume was adjusted by the
intake density compensation,
the intake air pressure and/or
intake air temperatures, the
supplement for acceleration,
warming up, starting, the
compensation for battery
voltage, etc.

Also
incorporated in the computer-
controlled fuel injection
system was a self-diagnosis
system that activated the
warning lamp and the backup
system to keep the engine
running when a failure
occurred in the system.
CX500TURBO
The racing machine of the 21st
century - RC211V
In the world of championship
motorcycle road racing, the
machine regulations of the
pinnacle 500cc class
underwent a drastic reform,
and changed its name to
"MotoGP" in 2002. The
machine regulations changed
from a 2-stroke, 500cc engine
to a 4-stroke, 990cc maximum
displacement, and the name
of the class was modified to
"MotoGP". The Honda RC211V
is the machine that was
developed to meet the new
regulations. Honda has
developed a unique engine
having the V-5 configuration.

After dominating the races in
the debut year 2002, the
RC211V keeps winning in an
overwhelming manner in 2003.
RC211V
FI control ensuring superb
driveability
The MotoGP machine uses
fully closed or partially
opened throttle conditions
way more frequently than the
Formula 1 race cars, for
example. Compared to the
Formula one cars which use
fully opened throttle
frequently, the controllability
of the power output is more
critical than the maximum
power output. Honda
developed and applied new
techniques to provide superb
driveability for the PGM-FI
used in the RC211V.
Twin injector
Providing the deflecting multi-
hole levigation injectors
before and after the throttle
valve, and having each one
take care of the low load zone
(after throttle) and the high
load zone (before throttle),
both the driveability and the
high power output have been
realized.
Variable fuel pressure control
The accurate control of fuel
supply and throttle
controllability are attained by
the ECU continuously
controlling the fuel pressure.

Predictive control of residual
injected fuel
When the throttle is opened
or closed (fully opened, fully
closed, not when kept at a
partial opening), the "amount
of fuel sticking" on the inlet
port walls and flowing into the
combustion chamber during
the following combustion
cycle is predicted and applied
to the control to ensure the
most suitable air fuel ratio for
improvement in driveability
and fuel economy.
List of Honda motorcycles
equipped with a PGM-FI
The PGM-FI is one of the core
technologies to attain the
goals of clean exhaust gas and
fuel economy. An inevitable
next goal is to extend the
application of the innovative
technique to models in various
categories that respond to a
larger number of users.

Through the newly developed
compact PGM-FI, Honda
increases the application from
large touring models, to the
super sport models, and the
models targeted towards a
larger number of people.
Honda Worldwide Home Motorcycle Picture Book Technology Close-up Fuel Injection System for Small Engines