[Timo_L]

Tässä vielä noiden RE- laatikoiden sielunelämästä, jos kiinnostaa..:

GOVERNOR PRESSURE CURVES:

LOW TRANSMISSION FLUID TEMPERATURE
When the transmission fluid is cold the conventional
governor can delay shifts, resulting in higher
than normal shift speeds and harsh shifts. The electronically
controlled low temperature governor pressure
curve is higher than normal to make the
transmission shift at normal speeds and sooner. The
PCM uses a temperature sensor in the transmission
oil sump to determine when low temperature governor
pressure is needed.

NORMAL OPERATION
Normal operation is refined through the increased
computing power of the PCM and through access to
data on engine operating conditions provided by the
PCM that were not available with the previous
stand-alone electronic module. This facilitated the
development of a load adaptive shift strategy - the
ability to alter the shift schedule in response to vehicle
load condition. One manifestation of this capability
is grade 9hunting9 prevention - the ability of the
transmission logic to delay an upshift on a grade if
the engine does not have sufficient power to maintain
speed in the higher gear. The 3-2 downshift and
the potential for hunting between gears occurs with a
heavily loaded vehicle or on steep grades. When
hunting occurs, it is very objectionable because shifts
are frequent and accompanied by large changes in
noise and acceleration.

WIDE OPEN THROTTLE OPERATION
In wide-open throttle (WOT) mode, adaptive memory
in the PCM assures that up-shifts occur at the
preprogrammed optimum speed. WOT operation is
determined from the throttle position sensor, which
is also a part of the emission control system. The initial
setting for the WOT upshift is below the optimum
engine speed. As WOT shifts are repeated, the
PCM learns the time required to complete the shifts
by comparing the engine speed when the shifts occur
to the optimum speed. After each shift, the PCM
adjusts the shift point until the optimum speed is reached.
The PCM also considers vehicle loading,
grade and engine performance changes due to high
altitude in determining when to make WOT shifts. It
does this by measuring vehicle and engine acceleration
and then factoring in the shift time.

TRANSFER CASE LOW RANGE OPERATION
On four-wheel drive vehicles operating in low
range, the engine can accelerate to its peak more
rapidly than in Normal range, resulting in delayed
shifts and undesirable engine 9flare.9 The low range
governor pressure curve is also higher than normal
to initiate upshifts sooner. The PCM compares electronic
vehicle speed signal used by the speedometer
to the transmission output shaft speed signal to
determine when the transfer case is in low range.