When a vehicle electric power source is turned on, and when a target mode position is other than a P-mode position and a D-mode position or the target mode position is unfixed, an SBW-ECU does not drive the actuator so that the current actual mode position is maintained. The SBW-ECU accepts only the
When a vehicle electric power source is turned on, and when a target mode position is other than a P-mode position and a D-mode position or the target mode position is unfixed, an SBW-ECU does not drive the actuator so that the current actual mode position is maintained. The SBW-ECU accepts only the driver's requirement for changing the mode position to the P-mode position or the D-mode position. When it is required to change the mode position to the P-mode position, a first position learning portion learns a first reference position. When it is required to change the mode position to the D-mode position, a second position learning portion learns a second reference position.
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1. A shift-by-wire system for changing a mode position of the automatic transmission of a vehicle according to a signal of a shift selector manipulated by a driver of the vehicle, the shift-by-wire system comprising: an actuator including an electric motor, an incremental type encoder outputting a p
1. A shift-by-wire system for changing a mode position of the automatic transmission of a vehicle according to a signal of a shift selector manipulated by a driver of the vehicle, the shift-by-wire system comprising: an actuator including an electric motor, an incremental type encoder outputting a pulse signal according to a rotation of the motor, and a reduction gear reducing the rotation of the motor and outputting the reduced rotation;a detent plate connected to the reduction gear to be rotated by the actuator, the detent plate having a first end concave portion formed at one end in a rotational direction thereof, a second end concave portion formed at the other end in a rotational direction, and a plurality of middle concave portions formed between the first end concave portion and the second end concave portion;a detent spring having a regulating portion which can be engaged with one of the first end concave portion, the middle concave portions, and the second end concave portion to regulate a rotation of the detent plate so that the mode position of the automatic transmission is fixed; anda control portion defining a target mode position based on the signal of the shift selector and driving the actuator so that the mode position of the automatic transmission is brought into the target mode position, whereinthe first end concave portion corresponds to a parking-mode position and defines a first wall,the second end concave portion corresponds to a position for driving a vehicle forward and defines a second wall,the middle concave portions correspond to at least a reverse-mode position and a neutral-mode position,the control portion includes: a first position learning portion which drives the motor in a direction in which the regulating portion is brought into contact with the first wall, and learns a first reference position of the actuator corresponding to the parking-mode position when it is detected that a maximum value or a minimum value of a count number of the pulse signal outputted from the encoder does not change for a specified time period; anda second position learning portion which drives the motor in a direction in which the regulating portion is brought into contact with the second wall, and learns a second reference position of the actuator corresponding to the drive-mode position when it is detected that the maximum value or the minimum value of the count number of the pulse signal outputted from the encoder does not change for a specified time period, wherein when a vehicle electric power source is turned on,the first position learning portion learns the first reference position in a case that the target mode position is the parking-mode position,the second position learning portion learns the second reference position in a case that the target mode position is a mode position corresponding to the second end concave portion,the control portion does not drive the actuator to maintain a current mode position in a case that the target mode position is other than the parking-mode position and a mode position corresponding to the second end concave portion,the control portion accepts only a requirement for changing the mode position to the parking-mode position or the mode position corresponding to the second end concave portion,the first position learning portion learns the first reference position when it is required to change the mode position to the parking-mode position, andthe second position learning portion learns the second reference position when it is required to change the mode position to the mode position corresponding to the second end concave portion. 2. A shift-by-wire system according to claim 1, further comprising a notification portion which notifies a driver of a situation where the mode position can be changed into only the parking-mode position or the mode position corresponding to the second end concave portion. 3. A shift-by-wire system according to claim 1, further comprising a warning portion which notifies the driver of the situation where the mode position can not be changed into other than the parking-mode position and the mode position corresponding to the second end concave portion when it is required to change the mode position into other than the parking-mode position and the mode position corresponding to the second end concave portion. 4. A shift-by-wire system according to claim 1, the control portion further includesa memory portion which stores a condition of the actuator and the actual mode position of when the vehicle electric power source is turned off, anda target mode position establishing portion which sets a target mode position,wherein when the vehicle electric power source is turned on, the target mode position establishing portion sets the actual mode position stored in the memory portion as the target mode position in a case that the actuator is at a stop condition, and the target mode position is unfixed in a case that the actuator is at the operated condition. 5. A shift-by-wire system for changing a mode position of the automatic transmission of a vehicle according to a signal of a shift selector manipulated by a driver of the vehicle, the shift-by-wire system comprising: an actuator including an electric motor, an incremental type encoder outputting a pulse signal according to a rotation of the motor, and a reduction gear reducing the rotation of the motor and outputting the reduced rotation;a detent plate connected to the reduction gear to be rotated by the actuator, the detent plate having a first end concave portion formed at one end in a rotational direction thereof, a second end concave portion formed at the other end in a rotational direction, and a plurality of middle concave portions formed between the first end concave portion and the second end concave portion;a detent spring having a regulating portion which can be engaged with one of the first end concave portion, the middle concave portions, and the second end concave portion to regulate a rotation of the detent plate so that the mode position of the automatic transmission is fixed;a control portion defining a target mode position based on the signal of the shift selector and driving the actuator so that the mode position of the automatic transmission is brought into the target mode position; anda torque control portion intercepting or reducing a transmission of a driving torque from the engine to the wheels, whereinthe first end concave portion corresponds to a parking-mode position and defines a first wall,the second end concave portion corresponds to a drive-mode position and defines a second wall,the middle concave portions correspond to at least a reverse-mode position and a neutral-mode position,the control portion includes: a first position learning portion which drives the motor in a direction in which the regulating portion is brought into contact with the first wall, and learns a first reference position of the actuator corresponding to the parking-mode position when it is detected that a maximum value or a minimum value of a count number of the pulse signal outputted from the encoder does not change for a specified time period;a second position learning portion which drives the motor in a direction in which the regulating portion is brought into contact with the second, and learns a second reference position of the actuator corresponding to the driving-mode position when it is detected that a maximum value or a minimum value of a count number of the pulse signal outputted from the encoder does not change for a specified time period; anda power source determining portion which determines whether the vehicle electric power source is intentionally turned on by a driver or the vehicle electric power source is turned on after momentarily turned off, wherein when it is determined that the vehicle electric power source is intentionally turned on by the driver, the first position learning portion learns the first reference position,when it is determined that the vehicle electric power source is turned on after momentarily turned off,the torque control portion intercepts or reduces the transmission of the driving torque and makes impossible to receive a requirement for changing the mode position,at least one of the first reference position and the second reference position is learned,subsequently the mode position is changed to the specified mode position and it is made possible to receive a requirement for changing the mode position. 6. A shift-by-wire system according to claim 5, further comprising: a first notification portion which notifies a driver of a situation in which it is impossible to accept a requirement for changing a mode position. 7. A shift-by-wire system according to claim 5, further comprising: a warning portion which notifies the driver of the situation where the mode position can not be changed. 8. A shift-by-wire system according to claim 5, further comprising: a second notification portion which notifies a driver of a situation in which it is possible to accept a requirement for changing a mode position. 9. A shift-by-wire system according to claim 5, wherein the torque control portion includes:a portion which can shift a transmission gear to a neutral mode position;a switching portion which switches a condition of a driving motor between a condition where the driving motor is energized and a condition where the driving motor is deenergized in a case that the driving torque is generated by the driving motor; anda throttle valve control portion which adjusts an intake air flow rate in a case that the driving torque is generated by an internal combustion engine. 10. A shift-by-wire system according to claim 5, wherein the control portion further includes:a memory portion which stores the condition of the actuator and the actual mode position of when the vehicle electric power source is turned off; anda target mode position establishing portion which establishes the actual mode position stored in the memory portion as the target mode position in a case that the stored condition of the actuator is a stop condition when the vehicle electric power source is turned on, and which establishes that the target mode position is an unfixed condition in a case that the stored condition of the actuator is at an operated condition when the vehicle electric power source is turned on,in a case that the target mode position established by target mode position establishing portion is other than an unfixed condition, the control portion establishes the target mode position as a specified mode position,in a case that the target mode position is unfixed, the control portion establishes the target mode position as the specified mode position and does not drive the actuator until the target mode position is fixed so that the current actual mode position is maintained. 11. A shift-by-wire system according to claim 5, wherein in a case that the only one of the first reference position and the second reference position is learned, the control portion determines whether the first reference position is learned or the second reference position is learned based on the target mode position of when the vehicle electric power source is turned on. 12. A shift-by-wire system according to claim 11, wherein the first position learning portion learns the first reference position in a case that the target mode position is the parking-mode position when the vehicle electric power source is turned on, andthe second position learning portion learns the second reference position in a case that the target mode position is other than the parking-mode position when the electric power source is turned off. 13. A shift-by-wire system according to claim 5, wherein when the power source determining portion determines that the vehicle electric power source is turned on after unintentionally turned off and the target mode position is a mode position corresponding to the second end concave portion, the control portion continues to transmit the driving force to the wheels without intercepting or reducing the transmission of the driving force by the torque control portion. 14. A shift-by-wire system for changing a mode position of the automatic transmission of a vehicle according to a signal of a shift selector manipulated by a driver of the vehicle, the shift-by-wire system comprising: an actuator including an electric motor, an incremental type encoder outputting a pulse signal according to a rotation of the motor, and a reduction gear reducing the rotation of the motor and outputting the reduced rotation;a detent plate connected to the reduction gear to be rotated by the actuator, the detent plate having a first end concave portion formed at one end in a rotational direction thereof, a second end concave portion formed at the other end in a rotational direction, and a plurality of middle concave portions formed between the first end concave portion and the second end concave portion;a detent spring having a regulating portion which can be engaged with one of the first end concave portion, the middle concave portions, and the second end concave portion to regulate a rotation of the detent plate so that the mode position of the automatic transmission is fixed; anda control portion defining a target mode position based on the signal of the shift selector and driving the actuator so that the mode position of the automatic transmission is brought into the target mode position, whereinthe first end concave portion corresponds to a parking-mode position and defines a first wall,the second end concave portion corresponds to a position for driving a vehicle forward and defines a second wall,the middle concave portions correspond to at least a reverse-mode position and a neutral-mode position,the control portion includes: a first position learning portion which drives the motor in a direction in which the regulating portion is brought into contact with the first wall and learns a first reference position of the actuator corresponding to the parking-mode position when it is detected that a maximum value or a minimum value of a count number of the pulse signal outputted from the encoder does not change for a specified time period; anda power source determining portion which determines whether the vehicle electric power source is intentionally turned on by a driver or the vehicle electric power source is turned on after momentarily turned off, wherein when it is determined that the vehicle electric power source is intentionally turned on by the driver, the first position learning portion learns the first reference position,when it is determined that the vehicle electric power source is turned on after momentarily turned off, a driver of the vehicle is notified that after the vehicle is stopped and the vehicle electric power source is turned off, the vehicle electric power source should be turned on, and further the actuator is not driven to maintain the current actual mode position. 15. A shift-by-wire system according to claim 14, further comprising a warning portion which notifies the driver of the situation where the mode position can not be changed.
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