Honda ACCORD HYBRID 2005 Service Manual page 280

Fuel and Emissions Systems
S y s t e m D e s c r i p t i o n ( c o n t ' d )
Variable Cylinder Management (VCM) System
The i-VTEC (intelligent variable valve t i m i n g and lift electric control system) adopts a cylinder pause VTEC (variable
cylinder system). The cylinder pause VTEC system pauses the intake and exhaust valves on the rear bank under
certain conditions such as cruise and fuel cut (see illustration below). Since the valves on the rear bank are closed, the
frictional losses f r o m valve spring compression and p u m p i n g are reduced because no air is compressed in the rear
bank. This reduces engine drag.
V E H I C L E
S P E E D
i
\
i
\
>
IDLING A C C E L E R A T I O N C R U I S E
D E C E L E
RATION
C R U I S E
D E C E L E
RATION
IDLING
A C C E L E
RATION
|« V < •
FUEL C U T , FUEL CUT
ALL CYLINDER DRIVE
(6 CYLINDERS)
CYLINDER P A U S E DRIVE
(3 CYLINDERS)
ALL CYLINDER
DRIVE (6 CYLINDERS)
k i I i
REALIZATION OF CYLINDER F U E L C U T R E T U R N
P A U S E CONDITION
The v i b r a t i o n generated by three-cylinder operation is counteracted by an active control engine m o u n t s y s t e m .
11-40