Control apparatus for an automatic transmission
View Patent ↗A transmission system in a vehicle using a motor to transmit power assists acceleration by generating auxiliary engine power during acceleration in addition to gear changing by the motor. Where acceleration assistance is added, torque transition is conducted along a torque transmission route of dog clutch, second intermediate shaft, motor, first intermediate shaft, and gear position of first intermediate shaft before shifting so as to avoid the torque reduction in uncomfortable shocks and feelings to the driver due to torque reduction when shifting.
1. A control apparatus which transmits torque from a power plant to first and second intermediate shafts respectively via first and second input clutches, transfers torque from the two intermediate shafts to an output shaft via transmission gears and shifting clutches that are respectively provided on the transmission gears, and transfers torque from a shifting position of the first intermediate shaft to a shifting position of the second intermediate shaft by a motor which is differentially connected between the intermediate shafts; wherein
a torque transition is conducted along a torque transmission route of the second input clutch, the second intermediate shaft, the motor, the first intermediate shaft, and a gear position of the first intermediate shaft before shifting;
when a shifting command is submitted while torque is transmitted from the power plant to the output shaft via the first intermediate shaft, the transmission gear of the first intermediate shaft, and the shifting clutch on the first intermediate shaft while the first input clutch is engaged and the second input clutch is disengaged,
the control apparatus engages the second input clutch of the second intermediate shaft to form the torque transmission route of the power plant, connected to a first input shaft, the second intermediate shaft, a second input shaft connected to the motor, the transmission gear on the first intermediate shaft, and the shifting clutch on the first intermediate shaft, and then disengages the first input clutch, engages the shifting clutch of the transmission gear on the second intermediate shaft, and disengages the shifting clutch of the transmission gear on the first intermediate shaft; and
the control apparatus outputs a torque equivalent to the torque of the power plant from the motor before disengaging the first input clutch.
2. The control apparatus of claim 1 , wherein, when outputting a torque equivalent to the torque of the power plant from the motor at the start of transmission, the control apparatus applies thrust to disengage the first input clutch, gradually increases the torque from the motor, and thus disengages the first input clutch.
3. The control apparatus of claim 1 , wherein the control apparatus changes or vibrates so that the difference between the torque from the motor and the torque of the power plant is inverted when disengaging the first input clutch.
4. The control apparatus of claim 1 , wherein the control apparatus increases a rate of change of the torque from the motor to disengage the first input clutch when a state of charge of a battery unit connected to the motor is low, when a temperature of the motor is high, or when a shifting duration must be shortened.
5. The control apparatus of claim 1 , wherein the control apparatus increases a range of change in torque vibration to disengage the input clutch when a state of charge of a battery unit connected to the motor is low, when a temperature of the motor is high, or when a shifting duration must be shortened.
6. The control apparatus of claim 1 , wherein the control apparatus increases a gear-disengaging thrust to disengage the first input clutch when the difference between the torque from the motor and the torque of the power plant is small and the first input clutch is not disengaged for a preset time period.
7. The control apparatus of claim 1 , wherein the control apparatus controls the torque from the motor to increase the speed positively or negatively while one of the input clutches is disengaged.
8. The control apparatus of claim 1 , wherein the torque from the motor is increased during shifting to improve power performance.
9. The control apparatus of claim 1 , wherein the output of the motor is determined according to the torque of the power plant.
10. The control apparatus of claim 1 , wherein the output of the motor is determined according to a target driving torque of a controlled component.
11. The control apparatus of claim 1 , wherein the control apparatus is equipped with a shift lever freely operated by a driver for up- or down-shifting and works to decrease the torque of the power plant and increase the torque of the motor when the shift lever is up-shifted or to increase the torque of the power plant and decrease the torque of the motor when the shift lever is down-shifted.
12. The control apparatus of claim 1 , wherein the control apparatus holds the torque output from the motor without disengaging the previous shifting clutch at the end of shifting.
13. The control apparatus of claim 12 , wherein the control apparatus gradually decreases the torque output from the motor without disengaging the previous shifting clutch at the end of shifting.
14. The control apparatus of claim 1 , wherein the control apparatus switches between the torque transition and ordinary torque transition according to a status of a controlled component.