The hydraulic system in the electro-hydraulic unit is divided into two systems and corresponds to the conventional brake pipeline.
When the ABS system is activated, the ABS-ECU turns the inlet and outlet solenoid valves on or off. Depending on the combination of on/off signals, the ABS system reduces, maintains or increases the TJ pressure in the solenoid valves and controls the pressure in the wheel cylinders.
Action of solenoid valves
ABS-ECU
Combining the ABS-ECU with a hydraulic unit reduces the number of wires for signal transmission to the solenoid valves and the electric pump, which increases the reliability of the system.
A self-diagnostic program is also built into the ABS-ECU system. In the event of a malfunction, the ABS-ECU activates safe operation and illuminates the ABS or brake system warning lamp (warns of a malfunction of the EBD - electronic brake force distribution system).
The ABS-ECU unit receives data on the vehicle speed, the rotational speed of each wheel, the wheel slip is calculated and, based on this data, the unit controls the solenoid valves of the hydraulic unit and prevents the wheels from blocking.