The hydraulic system in the electronic hydraulic unit is divided into two systems and corresponds to the normal brake line.
When the ABS system is turned on, 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 brake fluid pressure in the solenoid valves and controls the pressure in the wheel cylinders.
Operation of electromagnetic valves
ABS-ECU unit
Combining the ABS-ECU unit with the hydraulic unit reduces the number of wires for transmitting signals to the electromagnetic valves and electric pump, which increases the reliability of the system.
The ABS-ECU system also has a built-in self-diagnosis program. If a malfunction is detected, the ABS-ECU unit activates safe operation and turns on 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 rotation frequency of each wheel, calculates wheel slip and, based on this data, the unit controls the electromagnetic valves of the hydraulic unit and prevents the wheels from locking.