Function
ESP is a kind of automatic safety control system,which is a dependent system based on other traction control system.Specific functions are shown in Table.5.2.
Table.5.2 Specific Functions
(1)ABS：Prevent the wheel from being locked when braking,and make the vehicle keep directive and steady when the maximum braking strength is provided.
(2)EBD：Before ABS works,or when ABS fails due to specific failure,EBD can adjust the braking force of rear wheels to make sure that the rear wheels won’t be locked before the front wheels so as to ensure the safety of vehicle.(https://www.daowen.com)
(3)TCS：By checking the sliding condition of driving wheels,TCS controls the braking torque and output torque of the engine to prevent or lower the sliding condition of driving wheels and improve the vehicle’s driving stability,acceleration performance and climbing ability.
(4)ESP：ESP prevents the sliding of the vehicle by selective brake sub-cylinder or engine management system intervention.
(5)HBA：HBA identifies the emergency braking condition by checking the pressure and pressure change speed of brake master cylinder and increases the pressure quickly and automatically to reach the trigger pressure of ABS so as to shorten the braking distance.
(6)HBB：HBB helps the driver to start on the slope without hand brake,brake pedals and car slipping and prevents the vehicle from slipping downward.
(7)HHC：HHC is a kind of hydraulic compensation system,which is used to compensate the pressure of brake master cylinder when the vacuum is insufficient.