GF42.45-P-3500D | ASC control mode, function | 1.12.06 |
MODEL 163 as of 1.9.02 with CODE (472) Electronic Stability Program (ESP)
MODEL 170 with ENGINE 111, 112 with CODE (472) Electronic Stability Program (ESP)
MODEL 202 with ENGINE 111, 605, 611 with CODE (472) Electronic Stability Program (ESP)
MODEL 203
with CODE (472) Electronic Stability Program (ESP)
up to Model Year 8
MODEL 208 with ENGINE 111 with CODE (472) Electronic Stability Program (ESP)
MODEL 209 with CODE (472) Electronic Stability Program (ESP)
P42.45-2184-76
Shown using model 209 as an example
a Suction pipe
f High pressure
ASR control mode - build up pressure
The control procedure and value positions illustrated in the example refer to the RR brake.
If one of the drive wheels begins to spin when the vehicle is starting off or accelerating, the ESP control unit initiates the ASR pressure build-up control mode.
At the start of the ASR control the rear axle switchover solenoid valve (y19) is switched into the "Lock position" (closed) and the high-pressure and return pump (m1) is actuated.
The rear axle inlet solenoid valve (y23) is only opened during the pressure buildup phases. In the process the rear axle pump (p2) draws brake fluid out of the reservoir (y23) via the rear axle inlet solenoid valve and via the master brake cylinder.
The pressure limiting valve integrated in the rear axle switchover solenoid valve (y19) serves high pressure limitation (min. 150 bar).
P42.45-2185-76
Shown using model 209 as an example
a Suction pipe
b Brake pressure
f High pressure
ASR control mode - hold pressure
The control procedure and value positions illustrated in the example refer to the RR brake.
The hold pressure ASR control mode begins when strong brake intervention is no longer required to prevent drive slip.
The rear axle inlet solenoid valve (y23) and right rear solenoid valve (pressure hold) (y12) are closed. As a result the pressure in the brake caliper cannot be increased via the rear axle pump (p2).
P42.45-2186-76
Shown using model 209 as an example
e Reduced pressure
f High pressure
ASR control mode - reduce pressure
The control procedure and value positions illustrated in the example refer to the RR brake.
The pressure reduction ASR control mode begins if the braking pressure required to prevent drive slip is too high. The pressure reduction phase is introduced by opening the right rear solenoid valve (pressure release) (y13). The right rear solenoid valve (pressure hold) (y12) remains closed.
The brake fluid flowing back returns to the brake fluid reservoir via the rear axle pump (p2) through the pressure limiting valve integrated in the rear axle switchover solenoid valve (y19) via the master brake cylinder.
The rear axle pump (p2) is actuated pulsed during all control phases (depending on the requirement)t.
Different damping components (12, 13, 14) are installed to further reduce noise levels.