6.1.12. Management of emergency braking
At emergency braking the DSC HU/CM block increases pressure of brake liquid by increase in pressure in the main cylinder therefore the big brake effort is reached by smaller pressing a brake pedal.
The DSC HU/CM system uses the built-in sensor of pressure of brake liquid for control of speed of change of pressure in the main cylinder, the amplifier of emergency braking turns on, when speed of change of pressure will exceed a preset value, thus the system defines conditions of emergency braking.
The DSC HU/CM system calculates pressure in the cylinder of the brake mechanism, increases pressure of liquid in the main cylinder to a preset value. Thanks to change of pressure in the main cylinder, pressure in the cylinder of the brake mechanism can be increased.
In addition to normal pressure of brake liquid as all electromagnetic valves are switched on, the electric motor puts in action the pump which increases pressure in brake system.
|Fig. 6.7. Scheme of management of emergency braking of the Mazda car 3: 1–normal mode of braking; 2–a braking mode without the amplifier of emergency braking; 3–main cylinder; 4–electromagnetic valve of maintenance of stability; 5–electromagnetic valve of maintenance of pressure; 6–electromagnetic valve of pressure decrease; 7–pump electric motor; 8–electromagnetic valve of the switch of draft; 9–pump; 10-support piston
The amplifier of emergency braking starts to work at speeds of 17 km/h or above and less than 5 km/h do not join on speeds.