Mazda RX-8 2004 Service Highlights page 333

FEEDBACK CONTROL OPERATION
Upshift clutch engagement pressure feedback
• Clutch pressure (2) is learned so that gear shift
time (1) becomes a predetermined target value,
and thus changes in performance and changes in
the transmission over time are minimized based
on past gear shift results.
Upshift timing feedback (release-side clutch pressure)
• Clutch pressure release timing on the release
side (2) is learned so that the change in engine
speed (1) is optimized, and thus clutch pressures
on the engagement and release sides are
optimized.
End Of Sie
ENGINE-TRANSMISSION TOTAL CONTROL OUTLINE
Features
• The clutch engagement pressure is maintained in an optimal range due to engine output control when
downshifting to provide improved shift quality and assist shifting at high engine speeds.
Operation
• During downshifting, engine output torque variation is converted to signal form by the PCM, and input to the
TCM, which optimally controls clutch engagement pressure accordingly.
• Smooth shifting is achieved at high engine speeds due to the effective reduction in engine output torque.
End Of Sie
05–13–42
AUTOMATIC TRANSMISSION
TURBINE
REVOLUTION
CLUTCH
ENGAGEMENT
PRESSURE
ENGINE
SPEED
RELEASE
SIDE
CLUTCH
PRESSURE
ENGAGE SIDE
CLUTCH
PRESSURE
CHU051301030S14
TIME
CHU0513S058
TIME
CHU0513S059
CHU051301030S15