Honda ACCORD HYBRID 2005 Service Manual page 906

Automatic Transmission
S y s t e m D e s c r i p t i o n ( c o n t ' d )
Lock-up System
The lock-up mechanism of the torque converter clutch operates in the D position (2nd, 3rd, 4th, and 5th), and D3
position (2nd and 3rd). The pressurized fluid is drained f r o m the back of the torque converter t h r o u g h a fluid passage,
causing the torque converter clutch piston to be held against the torque converter cover. As this takes place, the
mainshaft rotates at the same speed as the engine crankshaft. Together w i t h the hydraulic c o n t r o l , the PCM optimizes
the t i m i n g and a m o u n t of the lock-up mechanism. W h e n shift solenoid valve D is turned on by the PCM, shift solenid
valve D pressure switches the lock-up shift valve lock-up on and off. The A/T clutch pressure control solenoid valve C,
the lock-up control valve, and lock-up t i m i n g valve control the a m o u n t of lock-up.
Torque Converter Clutch Lock-up ON (Engaging Torque Converter Clutch)
Fluid in the chamber between the t o r q u e converter cover and the torque converter clutch piston is drained off, and
fluid entering f r o m the chamber between the p u m p and stator exerts pressure t h r o u g h the torque converter clutch
piston against the torque converter cover. The torque converter clutch piston engages w i t h the torque converter cover;
torque converter clutch lock-up O N , and the mainshaft rotates at the same as the engine.
Power flow |
The power flows by w a y of:
Engine
Drive plate
Torque converter cover
Torque converter clutch piston
Damper spring
Turbine
i
Mainshaft
Torque Converter Clutch Lock-up O F F (Disengaging Torque Converter Clutch)
Fluid entered f r o m the chamber between the torque converter cover and the torque converter clutch piston passes
t h r o u g h the torque converter and goes out f r o m the chambers between the turbine and the stator, and between the
p u m p and the stator. As a result, the t o r q u e converter clutch piston moves away f r o m the torque converter cover, and
the torque converter clutch lock-up is released; torque converter clutch lock-up OFF.
MAINSHAFT
T O R Q U E C O N V E R T E R
C L U T C H PISTON
MAINSHAFT
14-70