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ABS
14
ANTI-LOCK BRAKES
BRAKINGWITHOUT ABS INTO OPERATION
Incase of brake operation without ABS, when driver
presses the brake pedal, brake pressure developed
in the TMC reaches each wheel through HU. During
this phase, both inlet & out let solenoid valves are
not switched ON (or excited) by ECU. Hence the
inlet valve is open and outlet valve remains closed.
(Ref Fig. 5)
Fig. 5
When the driver releases the brake pedal, the brake
fluid flows back from the respective wheel, through
the respective NRV (Non Return Valve) & reaches
TMC.
In this way, the whole brake system functions just
like in a vehicle with normal hydraulic brake system
(without ABS system).
Solenoid valve
Electricity status
Valve Open/Close
Open/Close channel
Inlet
OFF
OPEN
master cylinder - wheel cylinder
Outlet
OFF
CLOSE
wheel cylinder - reservoir
(Open)