Hydro unit
In addition to standard ABS systems, the ASTC system requires linear valves (one for each diagonal, two in total) and a pressure sensor.
Stability control system indicators
The indicators light up and flash in the following cases.
Brake system warning indicator:
- lights up for 3 seconds during testing after turning on the ignition;
- lights up when the ignition is on in the event of a malfunction in the electronic brake force distribution (EBD) system;
- flashes once per second if the yaw rate and acceleration sensor or steering sensor is not set to neutral.
ABS warning light:
- lights up for 3 seconds during testing after turning on the ignition;
- in case of forced activation of the actuator;
- lights up when the ignition is on in the event of a malfunction in the ABS system;
- lights up continuously if the voltage supply to the ASTC-ECU unit is too low;
- flashes once per second if the yaw rate and acceleration sensor or steering sensor is not set to neutral.
ASTC indicator:
- lights up for 3 seconds during testing after turning on the ignition;
- in case of forced activation of the actuator;
- flashes once per second if the yaw rate and acceleration sensor or steering sensor is not set to neutral position;
- flashes 4 times per second when ATC or ASC control is turned on.
ASTC off indicator:
- lights up for 3 seconds during testing after turning on the ignition;
- in case of forced activation of the actuator;
- flashes once per second if the yaw rate and acceleration sensor or steering sensor is not set to neutral position;
- lights up when the ignition is on in the event of a malfunction in the ABS system;
- lights up when ASC is switched off using the switch;
- flashes 2 times per second when the system is shutting down to protect the ASTC-ECU from overheating.
ASTC-ECU Block
The ECU integrates the functions of ABS, EBD, ASC and ATC. This enables the ASTC-ECU and ABS to work together and control the engine power and braking force in a coordinated manner.
Active Stability Control (ASTC) adds an acceleration and yaw rate sensor, a steering wheel sensor and a master cylinder pressure sensor to the ABS.
The ASTC-ECU unit collects information about the vehicle's movement from various sensors and creates a model of the ideal vehicle movement. After comparing the actual and ideal movement, the unit controls the braking force of each wheel and the engine power in order to bring the actual vehicle movement closer to the ideal model. The unit also prevents understeer or oversteer by controlling the turning moment.