초록 ▼

A coordinated regenerative brake system controls total brake torque to brake a vehicle in accordance with brake pedal operation and achieve deceleration intended by the driver's operation of the brakes when the accelerator is not depressed. In a vehicle speed range below specific speed V1, engine br

A coordinated regenerative brake system controls total brake torque to brake a vehicle in accordance with brake pedal operation and achieve deceleration intended by the driver's operation of the brakes when the accelerator is not depressed. In a vehicle speed range below specific speed V1, engine brake equivalent torque Ta is set to decrease gradually to zero in accordance with vehicle speed V. When brake operation starts at a vehicle speed exceeding V1, the desired total brake torque Tq working on the vehicle is the sum of brake torque Tb corresponding to brake operation, and engine brake equivalent torque Ta, until vehicle speed reaches specific speed V1. When vehicle speed is V1 or less, brake torque is controlled using as desired total brake torque Tq the sum of brake torque Tb corresponding to brake operation, and first engine brake equivalent torque Ta1, if brake operation amount Sb is greater than or equal to a first brake operation amount Sb1.

대표청구항 ▼

1. A method of controlling a coordinated regenerative brake system of a vehicle by coordinating a friction brake torque and a regenerative brake torque for a desired brake torque (Tq), the friction brake torque comprising a brake operation brake torque (Tb) responsive to a brake operation amount (Sb

1. A method of controlling a coordinated regenerative brake system of a vehicle by coordinating a friction brake torque and a regenerative brake torque for a desired brake torque (Tq), the friction brake torque comprising a brake operation brake torque (Tb) responsive to a brake operation amount (Sb), and the regenerative brake torque comprising an accelerator operation brake torque (Ta) responsive to an accelerator operation amount (Sa), the method comprising: when a speed of the vehicle (V) is less than or equal to a first predetermined vehicle speed (V1), and when the accelerator operation amount (Sa) is effectively zero and no brake operation amount (Sb) is made, controlling the desired brake torque (Tq) using the accelerator operation brake torque (Ta) to gradually approach zero in accordance with the vehicle speed (V), the accelerator operation brake torque (Ta) being equivalent to an engine brake torque working on the vehicle; and when the vehicle speed (V) is greater than the first predetermined vehicle speed (V1) when a brake operation begins, controlling the desired brake torque (Tq): using a sum of the brake operation brake torque (Tb) and the accelerator operation brake torque (Ta) when the vehicle speed exceeds the predetermined vehicle speed (V1); using a sum of the brake operation brake torque (Tb) and a first accelerator operation brake torque (Ta1), which is equivalent to the engine brake torque at the first predetermined vehicle speed (V1), when the vehicle speed (V) is less than or equal to the first predetermined vehicle speed (V1) and a brake operation amount (Sb) is greater than or equal to a first brake operation brake amount (Sb1), which corresponds to the first predetermined vehicle speed (V1); and using a sum of the brake operation brake torque (Tb) and a calculated accelerator operation brake torque (Ta'), the calculated accelerator operation brake torque (Ta') being calculated to approach the accelerator operation brake torque (Ta) from the first accelerator operation brake torque (Ta1) in accordance with a reduction ratio of the brake operation amount (Sb), when the vehicle speed (V) is less than or equal to the first predetermined vehicle speed (V1) and the brake operation brake amount (Sb) is less than the first brake operation brake amount (Sb1). 2. The method of controlling a coordinated regenerative brake system of a vehicle according to claim 1, further comprising: when the vehicle speed (V) is less than or equal to the first predetermined vehicle speed (V1) when the brake operation begins, and the brake operation amount (Sb) is increasing, controlling the desired brake torque (Tq) using a sum of the brake operation brake torque (Tb) and a second accelerator operation brake torque (Ta2), which is equivalent to the engine brake torque at the start of the brake operation; and when the vehicle speed (V) is less than or equal to the first predetermined vehicle speed (V1) when the brake operation begins, and the brake operation amount (Sb) is decreasing, controlling the desired brake torque (Tq) using a sum of the brake operation brake torque (Tb) and a second calculated accelerator operation brake torque (Ta"), the second calculated accelerator operation brake torque (Ta") being calculated to approach the accelerator operation brake torque (Ta) from the second accelerator operation brake torque (Ta2) in accordance with a reduction ratio of the brake operation amount (Sb) from a relative maximum brake operation amount. 3. The method of controlling a coordinated regenerative brake system of a vehicle according to claim 2, the second calculated accelerator operation brake torque (Ta") being determined according to the following relationship: Ta"=[(Ta2-Ta)/Tb2]×Tb+Ta