HEXA

ELECTRONIC STABILITY PROGRAM (ESP)

SYSTEM LAYOUT

The hydraulic circuit layout of the ESP system in this TATA vehicle is similar to ABS, i.e., vertical split. For

details refer the Hydraulic System Layout in ABS Section.

The ESP system consists of a hydraulic modulator with integrated pressure sensor; electronic control unit

and four wheel speed sensors which it shares with the ABS system. In addition to the individual wheel valves

present for the ABS the ESP hydraulic modulator has a pair of internal switching valves on the primary and

secondary brake circuits from the master cylinder. These are used when brake pressure has to be increased

at individual wheels. It has a yaw rate sensor and steering angle sensor connected via the high speed CAN,

which is also used to connect the ESP to the Instrument cluster, engine and TOD ECU’s. There is 1

additional information lamp in the instrument cluster which is used to identify when the system is operating

and when a fault has been detected.