Mazda CX-5 Service & Repair Manual: Ebd Control
Outline
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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
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EBD control has independent control systems for both the front and rear wheels.
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EBD control constantly and properly distributes brake fluid pressure regardless of vehicle weight.
Construction
Block Diagram
Operation
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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.
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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.
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The DSC HU outlet and inlet solenoid valves are operated and the brake fluid pressure controlled according to these conditions.
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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:
Steering Wheel And Column Inspection
Play inspection
1. With the wheels in the straight-ahead position, start the engine.
2. Turn the steering wheel to the left and right gently, then verify that the
steering wheel play is within the specification.
Steering wheel play
0—30 mm {0—1.1 in}
Looseness, Exces ...
Canister Vent (Cv) Solenoid Valve Inspection
U.S.A. And CANADA
Airflow inspection
1. Disconnect the negative battery cable..
2. Remove the CV solenoid valve..
3. Inspect airflow between the ports under the following conditions.
Measured condition
Continuity between A—B
When volta ...
Manifold Absolute Pressure (Map) Sensor
Purpose/Function
Detects the intake air pressure introduced into the cylinder as basic information
for mainly determining the fuel injection amount.
Detects the intake air pressure introduced into the cylinder and inputs it
to the PCM as an intake air pressure signal.
Cons ...
