Honda ACCORD HYBRID 2005 Service Manual page 880

Automatic Transmission
S y s t e m D e s c r i p t i o n ( c o n t ' d )
Electronic Control System (cont'd)
Auxiliary Transmission Fluid Pump (ATFP) Control
The auxiliary transmission f l u i d p u m p supplies hydraulic pressure to the hydraulic circuit d u r i n g auto idle stop.
W h e n the vehicle comes to a stop in auto idle stop m o d e , the ATF p u m p in the main valve body also stops, then the
PCM and auxiliary transmission f l u i d p u m p (ATFP) control unit start the auxiliary transmission f l u i d p u m p to supply
hydraulic pressure to the hydraulic circuit. The auxiliary transmission fluid p u m p continues to supply enough
hydraulic pressure for the clutch to engage until the engine auto-starts. W h e n the engine auto-starts, the ATFP control
unit stops the auxiliary transmission fluid p u m p .
The PCM outputs the required a m o u n t of motor torque to the ATFP control unit. The ATFP control unit processes data,
drives the auxiliary transmission f l u i d p u m p motor, and sends a feedback signal of motor t o r q u e to the PCM.
AUXILIARY T R A N S M I S S I O N
FLUID PUMP (ATFP) C O N T R O L UNIT
AUXILIARY T R A N S M I S S I O N
FLUID PUMP (ATFP)
The auxiliary transmission fluid p u m p is bolted on the torque converter housing. The ATFP consists of the t r o c h o i d
p u m p assembly and the 3-phase brushless DC motor.
PUMP MOTOR
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