Hybrid transmission
AssigneesNissan Motor Co., Ltd., RENAULT s.a.s. societe par actions simplifiee
InventorsYasuhiro Yamauchi, Toshikazu Oshidari, Keyvan Kargar, Yves Pichon
Life of this patent
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Abstract
In a hybrid transmission, a two-degree of freedom differential unit includes four or more rotary members and is structured in such a way that, when revolution states of two rotary members from among the four or more rotary members are determined, the revolution states of the other rotary members are determined, sequentially couples the respective rotary members, in a higher revolution speed order, to one motor/generator, to one of an output to a drive system and an input from a main power source, to the other of the output and input, and to another motor/generator, and a brake is installed to fix one of the rotary members related to the input.
Claims20
A hybrid transmission comprising:
- a two-degree of freedom differential unit including four or more rotary members and structured in such a way that, when revolution states of two rotary members from among the four or more rotary members are determined, the revolution states of the other rotary members are determined;
- a coupling section that sequentially couples the respective rotary members, in a higher revolution speed order, to one motor/generator, to one of an output to a drive system and an input from a main power source, to the other of the output and input, and to another motor/generator;
- and
- a brake installed to fix one of the rotary members which is coupled to the input from the main power source, wherein, during a vehicle start, the brake is engaged to fix the rotary member coupled to the input and respective motors are driven for both of the motor/generators to generate torques of a same direction to the output.
A method applicable to a hybrid transmission, the hybrid transmission comprising a two-degree of freedom differential unit including four or more rotary members and structured in such a way that, when revolution states of two rotary members from among the four or more rotary members are determined, the revolution states of the other rotary members are determined and the method comprising;
- sequentially coupling the respective rotary members, in a higher revolution speed order, to one motor/generator, to one of an output to a drive system and an input from a main power source, to the other of the output and input, and to another motor/generator;
- and
- installing a brake to fix one of the rotary members which is coupled to the input from the main power source, wherein during a vehicle start, the brake is engaged to fix the rotary member coupled to the input and respective motors are driven for both of the motor/generators to generate torques of a same direction to the output.
Dependencies are inferred from the claim text.