Grade Logic Control System - Honda 2002 Accord Manual

Automatic Transmission
System Description (cont'd)
Electronic Control System (cont'd)
Grade Logic Control System
How it w o r k s :
The PCM compares actual driving conditions w i t h memorized driving conditions, based on the input f r o m the
countershaft speed sensor, the throttle position sensor, the engine coolant temperature sensor, the brake pedal
position switch signal, and the shift lever position signal, to control shifting while the vehicle is ascending or
descending a slope, or reducing speed.
S E N S O R S / S W I T C H E S S I G N A L S D E T E C T E D P C M
o
o
c
!E
a
C o u n t e r s h a f t S p e e d
S e n s o r
T h r o t t l e P o s i t i o n
S e n s o r
D r i v i n g R e s i s t a n c e
E n g i n e C o o l a n t
T e m p e r a t u r e S e n s o r
C o o l a n t T e m p e r a t u r e
T r a n s m i s s i o n
R a n g e S w i t c h
H or H P o s i t i o n
C a l c u l a t i o n
of a c t u a l
a c c e l e r a t i o n
D e t e c t i o n of
s t a n d a r d
a c c e l e r a t i o n
(in M e m o r y )
C a l c u l a t i o n
of d e c e l e r a -
t i o n
C a l c u l a t i o n of g r a d i e n t
S e l e c t i o n of S h i f t i n g M o d e
- N o r m a l M o d e ( F l a t r o a d m o d e )
• A s c e n d i n g M o d e
• F u z z y L o g i c
• D e s c e n d i n g M o d e
• G r a d u a l D e s c e n d i n g M o d e
• S t e e p D e s c e n d i n g M o d e
• D e c e l e r a t i o n M o d e
A u t o m a t i c 4 S p e e d s
1 4 - 3 2