ELECTRONIC BRAKEFORCE DISTRIBUTION (EBD) CONTROL OUTLINE
BME041343750T03
• The Electronic Brakeforce Distribution (EBD) control system detects the front/rear wheel slip according to the signal from the ABS wheel-speed sensors. If the rear wheel slip increases beyond a preset limit in proportion to the front wheel, the ABS HU/CM optimally reduces the brake fluid to the rear wheels. Brakeforce can therefore be proportioned optimally according to vehicle load and road surface conditions.
• The table below classifies the conditions according to the rear wheel slip that is determined by comparing rear wheel-speed to the minimum speed of the front wheel and the estimated vehicle speed.
• EBD control changes the distribution rate of the brake fluid pressure to the rear wheels when condition 1, 2, or 3 in the table is met.
• If the ABS control conditions are satisfied, EBD control is stopped and ABS control takes priority.
Control condition table
|
Condition
|
Rear wheel slip
|
Electronic brakeforce distribution control (EBD)
|
Rear brake fluid pressure
|
Note
|
|
0
|
No slip
|
No control
|
Increase
|
Normal brake
|
|
1
|
a %-b %
|
Control
|
Retention
|
Electronic brakeforce distribution (EBD) control
|
|
2
|
b % or more
(During electronic brakeforce distribution control)
|
Reduction/Retention
|
|
3
|
c % or less
(During electronic brakeforce distribution control)
|
-
Note:
a, b, c preset values.
|
1
|
High
|
|
2
|
Time
|
|
3
|
Reduction
|
|
4
|
Retention
|
|
5
|
Increase
|
|
6
|
Brake caliper pressure
|
|
7
|
Front brake caliper pressure
|
|
8
|
Rear brake caliper pressure
|
|
9
|
EBD control area
|
|
10
|
ABS control area
|
|
11
|
Solenoid valve control
|