Dsc Hu/Cm; Brake Assist Control - Mazda 6 Training Manual

DSC HU/CM

Function
• The integrated DSC HU/CM, which is compact and lightweight, highly reliable has been adapted.
• The DSC HU/CM calculates the input signal of each sensor and controls each solenoid valve and the pump
motor (ON/OFF), adjusts fluid pressure to the caliper pistons, and activates each function of the DSC system
(ABS, Electronic Brakeforce Distribution (EBD), TCS, DSC and electrical brake assist).
• The construction and operation of DSC hydraulic pressure mechanism is the same as that of the current 323
(BJ), ecept for the operation of electric brake assist system. (See 323 Workshop Manual Supplement 1704-
1*-00J.)
• The DSC HU/CM outputs the engine torque control signal and vehicle speed signal through CAN line.
• The DSC HU/CM also outputs vehicle speed signal through a hard wire.
Function
Function
ABS control function
EBD (Electronic brakeforce distribution)
control
TCS control
DSC control

Brake assist control

Vehicle speed output
Diagnostic system
BRAKE ASSIST CONTROL
End Of Sie
Function
• During emergency braking, the DSC HU/CM increases brake fluid pressure by increasing the master cylinder
pressure, and therefore lessens the burden on the driver and enables use of a large braking force.
Operation
• The DSC HU/CM uses the built-in brake fluid pressure sensor to monitor the rate at which the master cylinder
pressure changes, and it initiates brake assist when it determines, from the pressure change, that emergency
braking is occurring.
• The DSC HU/CM calculates the caliper piston pressure, increases fluid pressure in the master cylinder above
the specified amount and, due to the change in master cylinder pressure, caliper piston pressure can be
increased.
• In addition to normal brake fluid pressure, as each solenoid valve is switched, the pump motor is operated to
rotate the pump which increases brake pressure force in the caliper pistons.
• Break assist is initiated at speeds of 17 km/h or above, and is inhibited at speeds of 5 km/h or below.
P–16
DYNAMIC STABILITY CONTROL
• When braking, maintains direction stability during braking operation, secures
handling and provides shortened braking distance by control of brake fluid
pressure.
• Prevents rear-wheel lockup through optimum control of normal brake fluid
pressure distribution to front and rear wheels in response to vehicle load,
condition of road surface and vehicle speed.
• Provides improved safety of start and acceleration performance by keeping
traction within limits of road surface friction in response to road and vehicle
speed conditions.
• Inhibits strong tendency of the vehicle to oversteer or understeer, by controlling
engine torque and braking on each wheel to provide assured vehicle stability.
• Controls the fluid of the caliper piston during emergency braking, provides
increased fluid pressure to each wheels.
• The value of the calculation from the 4 wheel speed sensors is output as a speed
signal to CAN line, and to wiper and washer switch, cruise actuator, audio unit,
auto leveling control unit by a hard wire.
• Important parts in the DSC control have a self-detection function that, in the
event of any abnormality, illuminate each warning light to inform the driver of an
abnormality together with recording the DTC in the DSC unit.
• When occurrence of an abnormality is judged by self-detection, cancels the
controls so as not to cause loss of driving safety.
Content
A6E692067650T09
A6E692067650T16