A drive train for a hybrid electric vehicle has an engine, first and second motor/generators, a third motor, and a transmission in connecting relationships with the engine, the motor/generators, and the third motor. The transmission has planetary gear sets to be shifted among a plurality of running
A drive train for a hybrid electric vehicle has an engine, first and second motor/generators, a third motor, and a transmission in connecting relationships with the engine, the motor/generators, and the third motor. The transmission has planetary gear sets to be shifted among a plurality of running modes including a large driving force running mode. A controller controls surplus power caused by power balance between the first and second motor/generators to be supplied to the third motor when the surplus power is generated and the vehicle starts with the transmission being operated in the large driving force running mode.
대표청구항▼
What is claimed is: 1. A drive train for a hybrid electric vehicle comprising: an engine that provides propulsion power by burning fuel; a first motor/generator that is selectively switched between an electric motor for providing driving force and an electric generator for producing electric power
What is claimed is: 1. A drive train for a hybrid electric vehicle comprising: an engine that provides propulsion power by burning fuel; a first motor/generator that is selectively switched between an electric motor for providing driving force and an electric generator for producing electric power; a second motor/generator that is selectively switched between an electric motor for providing driving force and an electric generator for producing electric power; a third motor capable of providing driving force; a transmission equipped with planetary gear sets having rotatable elements that are in connecting relationships with an output shaft connected to wheels, said engine, and said first and second motor/generators, said transmission being capable of transferring at least output of said engine to the wheels through the output shaft in a large driving force running mode obtained under a condition where said engine is in operation and at least one of said first and second motor/generators acts as the electric generator; and a controller that controls said first and second motor/generators and said third motor so that surplus power caused by power balance between said first and second motor/generators in the large driving force running mode is supplied to said third motor when the surplus power is generated. 2. The drive train for the hybrid electric vehicle of claim 1, wherein said controller detects existence of the surplus power when an electricity amount generated by one of said first and second motor/generators exceeds an electricity amount consumed by the other of said first and second motor/generators. 3. The drive train for the hybrid electric vehicle of claim 1, wherein said controller detects existence of the surplus power when one of said first and second motor/generators generates electricity and the other of said first and second motor/generators outputs zero. 4. The drive train for the hybrid electric vehicle of claim 1, wherein said controller detects existence of the surplus power when both of said first and second motor/generators generates electricity. 5. The drive train for the hybrid electric vehicle of claim 1, wherein the wheels includes a first set of wheels and a second set of wheels, the first set of wheels being driven by a driving force outputted through said transmission, and the second set of wheels being driven by a driving force outputted from said third motor. 6. The drive train for the hybrid electric vehicle of claim 5, wherein the first set of wheels is a set of front wheels and the second set of wheels is a set of rear wheels. 7. The drive train for the hybrid electric vehicle of claim 1, wherein said controller receives information on an accelerator opening degree of an accelerator pedal and a vehicle speed so as to compute a target driving force and supplies the surplus power to said third motor when the driving force outputted through said transmission is smaller than the target driving force and the surplus power is generated. 8. The drive train for the hybrid electric vehicle of claim 7, which further comprises a battery and a battery monitor that detects a state of charge of said battery, and wherein said controller supplies the surplus power to said battery when battery-charging is possible, while said controller supplies the surplus power to said third motor when the battery-charging is impossible. 9. The drive train for the hybrid electric vehicle of claim 1, which further comprises a battery and a battery monitor that detects a state of charge of said battery, and wherein said controller supplies the surplus power to said battery when battery-charging is possible, while said controller supplies the surplus power to said third motor when the battery-charging is impossible. 10. The drive train for the hybrid electric vehicle of claim 1, wherein the planetary gear sets of said transmission have velocity axes corresponding to said first motor/generator, said engine, the output shaft, and said second motor/generator that are arranged in these order in a common velocity diagram of said transmission, and wherein said transmission is controlled by a low brake to obtain the transmission ratio in a low transmission ratio range having a hybrid-electronic-vehicle-variable-transmission-ratio (HEV-iVT) mode where said engine and said first and second motor/generators are in operation so as to obtain a variable transmission ratio in the low transmission ratio range, and said controller controlling the surplus power to be supplied to said third motor in vehicle starting in the HEV-iVT mode. 11. The drive train for the hybrid electric vehicle of claim 10, wherein said controller receives information on an accelerator opening degree of an accelerator pedal and vehicle speed to compute a target driving force and supplies the surplus power to said third motor when the driving force outputted through said transmission is smaller than the target driving force and the surplus power is generated. 12. The drive train for the hybrid electric vehicle of claim 11, which further comprises a battery and a battery monitor that detects a state of charge of said battery, and wherein said controller supplies the surplus power to said battery when battery-charging is possible, while said controller supplies the surplus power to said third motor when the battery-charging is impossible. 13. The drive train for the hybrid electric vehicle of claim 10, which further comprises a battery and a battery monitor that detects a state of charge of said battery, and wherein said controller supplies the surplus power to said battery when battery-charging is possible, while said controller supplies the surplus power to said third motor when the battery-charging is impossible. 14. A transmission for a hybrid electronic vehicle comprising: planetary gear sets with rotatable elements that are in connecting relationships with an output shaft, an engine, a first motor/generator and a second motor/generator, wherein said planetary gear sets can be shifted among a plurality of running modes including a large driving force running mode, and have velocity axes corresponding to said first motor/generator, said engine, the output shaft, and said second motor/generator that are arranged in these order in a common velocity diagram of said transmission, said planetary gear sets being controlled by a low brake to obtain a transmission ratio in a low transmission ratio range including a hybrid-electronic-vehicle-variable-transmission-ratio (HEV-iVT) mode where said engine and said first and second motor/generators are in operation so as to obtain the variable transmission ratio and said planetary gear sets transfer at least an output of said engine to wheels through the output shaft with generating surplus power caused by a power balance between said first and second motor/generators for driving a third motor in the vehicle starting in the HEV-iVT mode. 15. A method of driving a hybrid electric vehicle comprising: providing propulsion power by an engine; respectively switching a first motor/generator and a second motor/generator selectively between an electric motor for providing driving force and an electric generator for producing electric power; and supplying surplus power caused by a power balance between said first and second motor/generators to a third motor for outputting driving force when the surplus power is generated and a large driving force running mode of a transmission is obtained under a condition where said engine is in operation and at least one of said first and second motor/generators acts as an electric generator, said transmission being is equipped with planetary gear sets with rotatable elements that are in connecting relationships with an output shaft connected to wheels, said engine and said first and second motor/generators to be shiftable among a plurality of running modes including the large driving force running mode where said transmission is capable of transferring at least an output of said engine to the wheels through the output shaft.
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이 특허에 인용된 특허 (4)
Thomas C. Bowen, Electric continuously variable transmission.
Tabata Atsushi,JPX ; Taga Yutaka,JPX ; Ibaraki Ryuji,JPX ; Mikami Tsuyoshi,JPX ; Hata Hiroshi,JPX, Hybrid vehicle drive system having a drive mode using both engine and electric motor.
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