Abstract:
A vehicle includes a main drive unit, a sub drive unit, and a control unit. The control unit includes a driving force distribution ratio setting unit and is configured to control the main drive unit and the sub drive unit. A drive mode of the main drive unit includes an electric power drive mode and an engine drive mode. The driving force distribution ratio setting unit is configured to set the driving force distribution ratio based on a vehicle speed, a required driving force, and the drive mode. When the drive mode is the engine drive mode, the driving force distribution ratio setting unit is configured to set the driving force distribution ratio so that a distribution ratio of the main driving force is 90% or more.
Abstract:
A motor controller obtains: a first motor target rotation number, a first motor actual rotation number of a first motor, a second motor target rotation number, and a second motor actual rotation number of a second motor; determines a first rotation number difference between the first motor target rotation number and the first motor actual rotation number of the first motor, and a second rotation number difference between the second motor target rotation number and the second motor actual rotation number of the second motor, determines first and second rotation control torques based on a smaller one of the first rotation number difference and the second rotation number difference; and determines a first motor torque of the first motor and a second motor torque of the second motor based on the first and second rotation control torques.
Abstract:
A slip determination system for a vehicle, which is capable of improving the determination accuracy by avoiding erroneous determination of excessive slip of wheels when a state of the wheels, driven/braked by motors, is switched. In the slip determination system according to the present invention, when first and second motor rotational speeds NMOT1 and NMOT2, which are rotational speeds of rear motors which brake/drive rear wheels WRL and WRR, reach a reference rotational speed NMREF set based on wheel rotational speeds NWFL, NWFR, NWRL, and NWRR, it is determined that excessive slip has occurred in the rear wheels WRL and WRR. When the sign of a target torque TROBJ of the rear motors is inverted, the reference rotational speed NMREF is changed to a value more difficult to be reached by the first and second motor rotational speeds NMOT1 and NMOT2, or the excessive slip determination is inhibited.
Abstract:
A vehicle drive system includes a slip acquisition unit that acquires occurrence of excessive slip, an addition slip point calculating unit that calculates addition slip points in a time-discrete manner, based on having acquired that the excessive slip has occurred, a cumulative slip point calculating unit that accumulates the addition slip points and calculates a cumulative slip point over time, a drive state switching unit that switches between 2WD and AWD based on cumulative slip points and a drive state switching threshold value, and a cumulative slip point resetting unit triggered by a lateral acceleration correlation value of the vehicle reaching a lateral acceleration threshold value or higher, or a drive force correlation value of the drive wheels reaching a drive force correlation threshold value or higher, to reset the cumulative slip point to a value smaller than the drive state switching threshold value.
Abstract:
A vehicle includes a main drive unit, a sub drive unit, and a control unit. The main drive unit includes a main drive rotary electric machine. The sub drive unit includes a sub drive rotary electric machine. The control unit includes a driving force distribution ratio setting unit configured to set a driving force distribution ratio between the main driving force and the sub driving force and is configured to control the outputs of the main drive unit and the sub drive unit so that the main driving force and the sub driving force have the driving force distribution ratio set by the driving force distribution ratio setting unit. The driving force distribution ratio setting unit is configured to set the driving force distribution ratio to minimize electric power loss of the vehicle based on a vehicle speed of the vehicle and a required driving force of the vehicle.
Abstract:
A vehicle drive system includes a slip acquisition unit that acquires occurrence of excessive slip, an addition slip point calculating unit that calculates addition slip points in a time-discrete manner, based on having acquired that the excessive slip has occurred, a cumulative slip point calculating unit that accumulates the addition slip points and calculates a cumulative slip point over time, a drive state switching unit that switches between 2WD and AWD based on cumulative slip points and a drive state switching threshold value, and a cumulative slip point resetting unit triggered by a lateral acceleration correlation value of the vehicle reaching a lateral acceleration threshold value or higher, or a drive force correlation value of the drive wheels reaching a drive force correlation threshold value or higher, to reset the cumulative slip point to a value smaller than the drive state switching threshold value.
Abstract:
A vehicle driving system includes: a left wheel driving system having a first motor and a first speed changer; a right wheel driving system having a second motor and a second speed changer; a motor controller which controls the first motor and the second motor, a rotation restricting unit which can be shifted between a released state and an applied state; and a rotation restricting unit controller which controls the rotation restricting unit. When the rotation restricting unit controller shifts the rotation restricting unit from the applied state to the released state, the motor controller controls the first motor and the second motor so that a torque sum of the first motor and the second motor approaches zero while maintaining a torque difference between the first motor and the second motor.
Abstract:
A motor controller obtains: a first motor target rotation number, a first motor actual rotation number of a first motor, a second motor target rotation number, and a second motor actual rotation number of a second motor; determines a first rotation number difference between the first motor target rotation number and the first motor actual rotation number of the first motor, and a second rotation number difference between the second motor target rotation number and the second motor actual rotation number of the second motor, determines first and second rotation control torques based on a smaller one of the first rotation number difference and the second rotation number difference; and determines a first motor torque of the first motor and a second motor torque of the second motor based on the first and second rotation control torques.
Abstract:
A driving device includes a first one-way clutch OWC1 provided on a power transmission path between a driving source and a driven portion which becomes in an engaged state when rotational power in one direction of the driving source side is input to the driven portion side and becomes in a disengaged state when rotational power in the other direction of the driving source side is input to the driven portion side and which becomes in a disengaged state when rotational power in one direction of the driven portion side is input to the driving source side and becomes in an engaged state when rotational power in the other direction of the driven portion side is input to the driving source side, a connection/disconnection unit which is provided in parallel with the first one-way clutch OWC1 on the power transmission path, and a second one-way clutch OWC2 provided in parallel with the first one-way clutch OWC1 and in series with the connection/disconnection unit on the power transmission path which performs an operation opposite to that of the first one-way clutch OWC1.
Abstract:
A vehicle drive system, that can improve drive efficiency while maintaining vehicle stability, includes a step (S3, S105) in which a switch is made from 2WD to AWD on the basis of a cumulative slip point; a step (S12, S303) in which a switch is made from 2WD to AWD on the basis of a calculated lateral G; a step (S13, S109, S111) in which a switch is made from AWD to 2WD after the step (S3 or S105) under a first switching condition; and a step (S13, S306, S308) in which a switch is made from AWD to 2WD after the step (S12 or S303) under a second switching condition. The first switching condition and the second switching condition differ from one another.