In a drive system of a vehicle, the drive power of an engine is divided by a planetary gear set to drive two power transfer shafts. One of the two shafts includes a continuously variable transmission unit and a clutch. The output sides of the two shafts are coupled to a common power output shaft, wh
In a drive system of a vehicle, the drive power of an engine is divided by a planetary gear set to drive two power transfer shafts. One of the two shafts includes a continuously variable transmission unit and a clutch. The output sides of the two shafts are coupled to a common power output shaft, which is coupled to an AC motor. In a power transfer condition of the clutch, the vehicle is driven with only the output drive power of the engine or both drive powers of the engine and the AC motor. In a power interruption condition of the clutch, the vehicle is driven with only the drive power of the AC motor. The kinetic energy generated at deceleration of the vehicle is converted into electric energy by the AC motor thereby to perform regenerative braking.
대표청구항▼
1. A vehicle drive system comprising: an internal combustion engine;a drive power regulator mechanism provided in a drive power transfer path between the engine and a drive axle of a vehicle;an electric motor/generator provided to transfer and receive drive power to and from the drive axle, respecti
1. A vehicle drive system comprising: an internal combustion engine;a drive power regulator mechanism provided in a drive power transfer path between the engine and a drive axle of a vehicle;an electric motor/generator provided to transfer and receive drive power to and from the drive axle, respectively;an electric power source provided to supply and receive electric power to and from the motor/generator, respectively; anda control unit provided to control the engine, the regulator mechanism and the motor/generator based on an operating condition of the vehicle, wherein:the regulator mechanism includes a planetary gear set as a drive power divider unit, a transmission unit and a switching unit, the divider unit dividing and transferring an output drive power of the engine to a first transfer path of drive power and a second transfer path of drive power, the transmission unit varying a transmission ratio between an input side and an output side of the first transfer path, and the switching unit transferring and interrupting drive power in the first transfer path or the second transfer path;the output sides of the first transfer path and the second transfer path are coupled to a common output shaft;a rotation speed of the input side of the first transfer path and a rotation speed of the output shaft are restricted by the transmission ratio when the switching unit is in a power transfer condition, and released from restriction by the transmission ratio when the switching unit is in a power interruption condition;the control unit is configured to control a power transfer/interruption condition of the switching unit based on a required drive power of the engine;the control unit is configured, when the switching unit is required to be switched from the power interruption condition to the power transfer condition, to set a rotation speed command value of the engine to a predetermined command value, calculate a transmission ratio command value of the transmission unit based on a rotation speed of the drive axle and the rotation speed of the input side of the first transfer path, which is calculated from a planetary ratio, a rotation speed of the engine and the rotation speed of the drive axle, the planetary ratio indicating a ratio between numbers of teeth of a sun gear and a ring gear of the planetary gear set;the control unit is configured to vary the rotation speed of the engine and the transmission ratio of the transmission unit so that a rotation speed difference between the input side and the output side of the switching unit is reduced, by controlling the engine so that the rotation speed of the engine attains the rotation speed command value and controlling the transmission unit so that the transmission ratio of the transmission unit attains the transmission ratio command value; andthe control unit is configured, when the rotation speed difference is reduce to be smaller than a predetermined difference value to switch over the switch unit from the power interruption condition to the power transfer condition. 2. The vehicle drive system according to claim 1, wherein: the control unit is configured to calculate the rotation speed difference based on the transmission ratio of the transmission unit, the planetary ratio of the planetary gear set, the rotation speed of the engine and the rotation speed of the drive axle. 3. The vehicle drive system according to claim 1, wherein: the control unit is configured to reduce the rotation speed difference by controlling the rotation speed of the engine to a target rotation speed by throttle control, when an operation mode of the vehicle is changed from a first operation mode, in which the vehicle travels with only the drive power of the motor/generator above a predetermined vehicle speed, to a second operation mode, in which the vehicle travels with only the drive power of the engine or both of the drive powers of the engine and the motor/generator. 4. The vehicle drive system according to claim 1, wherein: the control unit is configured to start the engine and control the switching unit to a semi-power transfer condition, when acceleration of the engine is requested under a vehicle travel speed less than a predetermined speed and an accelerator position being more than a predetermined position. 5. The vehicle drive system according to claim 1, wherein: the control unit is configured to change coordinately a torque command value of the engine and a torque command value of the motor/generator until one of the torque command values of the engine and the motor/generator is reduced to zero after the condition of the switching unit is changed. 6. The vehicle drive system according to claim 1, wherein: the control unit is configured to set the transmission ratio of the switching unit to increase deceleration of the engine in a process of stopping the engine by controlling the switching unit from the power transfer condition to the power interruption condition. 7. The vehicle drive system according to claim 6, wherein: the control unit is configured to set the transmission ratio to a larger ratio to increase the deceleration of the engine.
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이 특허에 인용된 특허 (3)
Yano Toru,JPX ; Tatara Yusuke,JPX ; Tamagawa Yutaka,JPX, Control system for hybrid vehicles.
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