The DSC HU/CM system uses a built-in brake fluid pressure sensor to monitor the rate of change of pressure in the master cylinder, the emergency brake booster is activated when the rate of change of pressure exceeds a predetermined value, thus the system determines the emergency braking conditions.
The DSC HU/CM system calculates the pressure in the brake cylinder, increases the fluid pressure in the master cylinder to a predetermined value. By changing the pressure in the master cylinder, the pressure in the brake cylinder can be increased.
In addition to the normal brake fluid pressure, since all the solenoid valves are turned on, the electric motor drives a pump that increases the pressure in the brake system.
Pic. 6.7. Mazda 3 emergency braking control scheme: 1 - normal braking mode; 2 - braking mode without an emergency brake booster; 3 - main cylinder; 4 - solenoid valve to maintain stability; 5 - solenoid valve for maintaining pressure; 6 - solenoid pressure reduction valve; 7 - pump motor; 8 - solenoid valve of the traction switch; 9 - pump; 10 - caliper piston
The emergency brake booster starts working at speeds of 17 km/h or higher and does not turn on at speeds less than 5 km/h.