Honda ACCORD HYBRID 2005 Service Manual page 1385

ABS Main Control
The ABS/TCS control unit detects the wheel speed based on the wheel sensor signals it receives, then calculates the
vehicle speed based on the detected w h e e l speed. The control unit detects the vehicle speed d u r i n g deceleration
based on the rate of deceleration.
The ABS/TCS control unit calculates the slip rate of each w h e e l , and it transmits the control signal to the m o d u l a t o r
unit solenoid valve w h e n the slip rate is high.
The pressure reduction control has three modes: Pressure reducing, pressure retaining, and pressure intensifying.
r
A B S / T C S C O N T R O L UNIT
I
Detect
W h e e l S p e e d |
Detect
h
W h e e l S p e e d h
Detect
r-
W h e e l S p e e d |-
D-H Detect \-
Wheel S p e e d | -
• I Select L o w
- • I S p e e d Wheel
[
Reference I
Slip Rate |
I
Detect I
s . S .
Slip Rate |
-j-J
RIGHT-FRONT
- • I A B S I • [ D r i v e I •». [
-*H Control H 1 Solenoid | \ \ .
| Solenoid |
^ L
I Drive ~ | L T R I G H T - F R O N T |
I S o l e n o i d j p [ S O L E N O I D
L E F T - F R O N T
- D e t e c t
I Slip Rate \
K
f o r l v ^ 1 L [ L E F T - F R O N T
I Solenoid [ j L s O L E N O i p
TCS Main Control
The ABS/TCS control unit controls the TCS based on signal inputs f r o m the accelerator pedal position sensor, engine
speed, shifter position, and the wheel sensors. In addition, the ABS/TCS control unit sends an engine retard request
signal to the PCM if necessary. The pressure intensifying control has three modes: Pressure intensifying, pressure
retaining, and pressure reducing.
A B S / T C S C O N T R O L UNIT
A C C E L E R A T O R
P E D A L POSITION
S E N S O R
Shifter position
signal
Detect
1 * w h e e l s p e e d
Detect
1 *" w h e e l speed
Detect
wheel s p e e d
•
Detect
1
* w h e e l speed
Calculate control
target value
Calculate drive
w h e e l speed
average
Calculate drive
w h e e l speed
difference
I T .
Calculate a m o u n t
of right-front
w h e e l control i t
Calculate amount
of left-front
w h e e l control
(cont'd)
19-41