Mazda CX-5 Service & Repair Manual: Ebd Control
Outline
-
EBD control uses the ABS system to control brake fluid pressure distribution to the rear wheels so that they do not lock-up prior to the front wheels during braking, thereby preventing the loss of handling stability.
Feature
-
EBD control has independent control systems for both the front and rear wheels.
-
EBD control constantly and properly distributes brake fluid pressure regardless of vehicle weight.
Construction
Block Diagram
Operation
-
EBD control detects the slip ratio between the estimated vehicle speed 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 DSC 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 0-3 shown in the table below.
-
The DSC 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.
|
Status |
Rear wheel slip ratio determination |
EBD control |
Solenoid valve |
Comment |
|
0 |
No slip |
No control |
Pressure increase |
— |
|
1 |
?%—?% |
Control |
Pressure maintained |
— |
|
2 |
After EBD control, slip ratio is ?% |
Control |
Increase/maintain |
— |
|
3 |
Front wheel slip ratio is ?% or more |
Control |
Pressure reduction/maintained/increase |
ABS control operates |
?—? Specified value
Operating Condition Transition Diagram
Dynamic Stability Control (DSC)
Outline
Electrical brake assist control has been adopted, improving safety.
The DSC HU/CM, integrating both the hydraulic unit (HU) and control module
(CM), has been adopted, resulti ...
Hill Launch Assist (Hla)
Purpose/Function
The hill launch assist (HLA) is a function which assists the driver in accelerating
the vehicle on a slope by activating the traction control solenoid valve in
the DSC HU ...
Other materials:
Drive By Wire Control
Outline
Calculates the optimum target throttle valve opening angle at all engine
speeds and controls the throttle valve actuator.
The drive-by-wire control is composed of the idle air control, accelerator
control, traction control, excess engine speed control, overspeed control, ...
Engine Mount
Purpose, Function
The engine mount secures the engine and transaxle to the vehicle body, reducing
vibration and noise.
Construction
The three points at the engine front (No.3 engine mount), one side of the
transaxle (No.1 engine mount), and the rear upper part of the transa ...
Air Fuel Ratio (A/F) Sensor Inspection
A/F Sensor Inspection
1. Connect the M-MDS to the DLC?2.
2. Switch the ignition ON (engine on).
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs using the M-MDS..
VSS (Vehicle speed)
RPM (Engine speed)
O2S11 (A/F sensor output current ...
