ASR
V/ETS control mode, function:
If
one or both drive wheels tends to spin when starting off
or
accelerating, the control module introduces the ASR or
ETS control
mode.
At
the start of ASR or ETS control the switchover solenoid valve
(y5)
switches into "locking position" (closed) and the
self-priming highpressure
pump/return pump (p1) is
actuated.
Bosch version: The intake solenoid
valve (y15) is actuated
differently depending on the pressure in the rear axle
brake calipers:
A
When a calculated pressure ?60 bar is reached in the
rear
axle
brake calipers the intake solenoid valve (y15) is
only
opened during the pressure build-up phases. The
self-priming
high-pressure pump/return pump (p1) draws in brake
fluid from
the
reservoir via the intake solenoid valve (y15) and via
the
master brake cylinder.
B
When a calculated pressure of > 60 bar is reached in one
of
the
rear axle brake calipers, the intake solenoid valve
(y15)
remains open continuously during the entire control.
The
pressure to the rear axle brake calipers is built up
by the selfpriming
high-pressure pump/return pump (p1) via the
solenoid
valves (y10, y12; not actuated -
open).
Teves version:
The
inlet solenoid valve (y15) is continuously
open.
The
pressure to the rear axle brake calipers is build up via the
selfpriming
high-pressure/return pump (p1) via the solenoid valves
(y10,
y12;
not actuated - open).
The
pressure limiting valve integrated in the switchover
solenoid
valve
(y5) is used for high-pressure limiting (approx. 160
bar).
The
diaphragm discharge damper (12) is used to reduce
noise.
