Block Diagram; Ebd Control Operation - Mazda 2006 MX-5 Service Highlights

Block Diagram

ABS WHEEL-SPEED
SENSOR (LF)
ABS WHEEL-SPEED
SENSOR (RF)
ABS WHEEL-SPEED
SENSOR (LR)
ABS WHEEL-SPEED
SENSOR (RR)
End Of Sie

EBD CONTROL OPERATION

• EBD control detects the slip ratio between the front and rear wheels from the ABS wheel-speed sensor signals.
If the slip ratio of the rear wheels as compared to the front wheels is larger than the fixed limit, the ABS HU/CM
reduces brake pressure being distributed to the rear wheels. Due to this, brake pressure distribution is
constantly controlled in the proper proportion and in relation to vehicle load, road surface conditions and
vehicle speed.
• Determination of the rear wheel slip ratio, based on a comparison of the lowest front wheel speed and the
estimated vehicle speed with the rear wheel speeds, is divided into conditions 0-4 shown in the table below.
• The ABS HU outlet and inlet solenoid valves are operated and the brake fluid pressure controlled according to
these conditions.
• If ABS control conditions are met during EBD control, EBD control is stopped and ABS control is given priority.
Conditi Rear wheel slip ratio
on determination
0 No slip
α%—β%
1
β% or more
2
After EBD control, slip ratio is γ%
3
Front wheel slip ratio is δ% or more
4
α δ: Specified value
—
ANTILOCK BRAKE SYSTEM
ABS HU/CM
CM
SOLENOID
VALVE
CPU
PUMP
MOTOR
EBD control
No control
Control
Control
Control
Control
HU
CALIPER PISTON (LF)
CALIPER PISTON (RF)
CALIPER PISTON (LR)
CALIPER PISTON (RR)
Solenoid valve
Pressure increase
Pressure maintained
Pressure reduction/
maintained
Pressure increase/
maintained
Pressure reduction/
maintained/ increase
04–13
C3U0413S011
E5U041343750N08
Comment
—
—
—
—
ABS control operates
04–13–9