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ELECTRONIC BRAKEFORCE DISTRIBUTION (EBD) CONTROL OUTLINE

BME041343750T11
• 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