CONTROL METHOD FOR PREVENTING BACKWARD SLIPPING OF HYBRID ELECTRIC VEHICLES ON SLOPE ROAD

摘要

PURPOSE: A control method for preventing backward slipping of a hybrid electric vehicle on a slope road is provided to prevent the vehicle from being slipped behind by applying only one gear step change control so that the vehicle is forced to change the gear step to a second step not rotating reversely in case of starting at the slope. CONSTITUTION: According to a method for preventing backward slipping of a hybrid electric vehicle on a slope road, a travelling inclination of a vehicle is judged(S102). It is checked that a brake is changed from on-state to off-state(S103). When the brake is in off-state, wheel braking by an EBS is performed by CAS or HAS(S106). A gear step control step(S108) changes the gear step of a gear transmission into a second step according to the APS on/off judgment result. When the APS is not turned on after wheel braking is done, the gear step of an automobile transmission is forced to be changed to a second step by one way clutch of the mobile transformer. [Reference numerals] (AA) Driving; (BB) Compulsory second stage(slipping prevention); (S101) Calculate load; (S102) Load >= A (according to gradient)?; (S103) Brake on & Vehicle speed = 0 ?; (S105) Operate HAS; (S106) Operate EBS(compulsory wheel lock); (S110) Required driving torque = First stage ?; (S111) First stage transmission; (S112) Second stage start