Method and apparatus for controlling transmission of vehicle
The present invention relates to a method and apparatus for controlling a transmission of a vehicle and, more particularly, to a method and apparatus for controlling synchronization of a synchronizer included in a transmission. The method includes determining a speed change mode of a vehicle and a target time corresponding to the speed change mode; calculating a difference in speed between an input shaft and an output shaft with respect to a current time; calculating a speed increment or decrement of the output shaft from the current time to the target time; calculating a synchronization torque using the difference in speed and the speed increment or decrement; determining a target displacement of a synchronizer using the synchronization torque; and controlling the synchronizer according to the target displacement and recognizing a sleeve with a clutch gear.
1. A method for controlling a transmission comprising:
determining a speed change mode of a vehicle and a target time corresponding to the speed change mode;
calculating a difference in speed between an input shaft and an output shaft with respect to a current time;
calculating a speed increment or decrement of the output shaft from the current time to the target time;
calculating a synchronization torque using the difference in speed and the speed increment or decrement;
determining a target displacement of a synchronizer using the synchronization torque; and
controlling the synchronizer according to the target displacement and recognizing a sleeve with a clutch gear.
2. The method according to claim 1 , further comprising:
detecting a synchronization gradient between the sleeve and the clutch gear;
comparing the synchronization gradient and a target gradient and determining a calibration value; and
applying the calibration value to the target displacement.
3. The method according to claim 1 , wherein, when the speed change mode is an acceleration mode, the synchronization torque is determined by Equation 1:
T
cone
=
Δ
ω
+
Δ
ω
accel
Δ
t
J
eq
,
n
,
Equation
1
wherein T cone denotes the synchronization torque, Δω denotes the difference in speed, Δω accel denotes the speed increment, Δt denotes a difference between the target time and the current time t 1 , and J eq,n denotes equivalent inertia for engagement of gear step n.
4. The method according to claim 1 , wherein, when the speed change mode is a deceleration mode, the synchronization torque is determined by Equation 2:
T
cone
=
Δ
ω
-
Δ
ω
decel
Δ
t
J
eq
,
n
,
Equation
2
wherein T cone denotes the synchronization torque, Δω denotes the difference in speed, Δω decel denotes the speed decrement, Δt denotes a difference between the target time and the current time t 1 , and J eq,n denotes equivalent inertia for engagement of gear step n.
5. The method according to claim 1 , wherein the synchronizing comprises:
converting the target displacement into a target control position of an actuator for driving the synchronizer; and
controlling the actuator according to the target control position and moving the synchronizer to the target displacement.
6. An apparatus for controlling a transmission, the apparatus comprising:
a calculator configured to determine a speed change mode of a vehicle and a target time corresponding to the speed change mode, calculate a difference in speed between an input shaft and an output shaft with respect to a current time, calculate a speed increment or decrement of the output shaft from the current time to the target time, and calculate a synchronization torque using the difference in speed and the speed increment or decrement; and
a controller configured to determine a target displacement of a synchronizer using the synchronization torque, and control the synchronizer according to the target displacement and recognizing a sleeve with a clutch gear.
7. The apparatus according to claim 6 , wherein the controller detects a synchronization gradient between the sleeve and the clutch gear, compares the synchronization gradient and a target gradient and determining a calibration value, and applies the calibration value to the target displacement.
8. The apparatus according to claim 6 , wherein, when the speed change mode is an acceleration mode, the synchronization torque is determined by Equation 1:
T
cone
=
Δ
ω
+
Δ
ω
accel
Δ
t
J
eq
,
n
,
Equation
1
wherein T cone denotes the synchronization torque, Δω denotes the difference in speed, Δω accel denotes the speed increment, Δt denotes a difference between the target time and the current time t 1 , and J eq,n denotes equivalent inertia for engagement of gear step n.
9. The apparatus according to claim 6 , wherein, when the speed change mode is a deceleration mode, the synchronization torque is determined by Equation 2:
T
cone
=
Δ
ω
-
Δ
ω
decel
Δ
t
J
eq
,
n
,
Equation
2
wherein T cone denotes the synchronization torque, Δω denotes the difference in speed, Δω decel denotes the speed decrement, Δt denotes a difference between the target time and the current time t 1 , and J eq,n denotes equivalent inertia for engagement of gear step n.
10. The apparatus according to claim 6 , wherein the controller converts the target displacement into a target control position of an actuator for driving the synchronizer, and controls the actuator according to the target control position and moving the synchronizer to the target displacement.