System Description - Honda Accord 2008 Manual

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Active Control Engine Mount (ACM) System
System Description
Overview
T h e a c t i v e c o n t r o l e n g i n e m o u n t ( A C M ) s y s t e m r e d u c e s t h e a m o u n t o f e n g i n e v i b r a t i o n t h a t c r e a t e s e n g i n e n o i s e
w h i c h is t r a n s m i t t e d t o t h e p a s s e n g e r ' s c o m p a r t m e n t .
T h e A C M s y s t e m c o n s i s t s o f t h e e n g i n e m o u n t a c t u a t o r s , t h e e n g i n e m o u n t c o n t r o l u n i t a n d t h e p o w e r t r a i n c o n t r o l
m o d u l e ( P C M ) .
T h e P C M s e n d s t h e c r a n k s h a f t p o s i t i o n (CKP) s e n s o r i n f o r m a t i o n a n d c a m s h a f t p o s i t i o n ( C M P ) s e n s o r i n f o r m a t i o n t o
t h e e n g i n e m o u n t c o n t r o l u n i t . T h e e n g i n e m o u n t c o n t r o l u n i t u s e s t h i s i n f o r m a t i o n t o p r e d i c t t h e a m o u n t o f v i b r a t i o n
c r e a t e d b y t h e e n g i n e .
T h e A C M s y s t e m t h e n u s e s t h e e n g i n e m o u n t a c t u a t o r s t o g e n e r a t e a c a n c e l i n g v i b r a t i o n t h a t o p e r a t e s l i k e t h e a c t i v e
n o i s e c o n t r o l ( A N C ) a n d r e d u c e s t h e a m o u n t o f n o i s e a n d v i b r a t i o n i n t h e p a s s e n g e r ' s c o m p a r t m e n t .
P C M
S i g n a l s
• C K P
• C M P
• S C P A
• S C P C
E n g i n e M o u n t
C o n t r o l U n i t
Engine Mount Actuator
driving current
A C M
R u b b e r
L i q u i d
P l u n g e r
T h e A C M g e n e r a t e s a v i b r a t i o n w i t h t h e a c t u a t o r a n d t h e p l u n g e r .
T h e e n g i n e v i b r a t e s .
T h e A C M c r e a t e s a c a n c e l i n g
n o i s e a n d v i b r a t i o n .
S o m e o f t h e e n g i n e n o i s e a n d v i b r a t i o n
is c a n c e l l e d a n d d o e s n o t t r a n s f e r t o
t h e p a s s e n g e r ' s c o m p a r t m e n t .
4-68

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