Patent Grant
8491438
The present application claims priority to Korean Patent Application Number 10-2010-0083393 filed Aug. 27, 2010, the entire contents of which application is incorporated herein for all purposes by this reference.
1. Field of the Invention
The present invention relates to a power train for a hybrid vehicle, and more particularly, to a technology of transmitting power from power sources to the driving wheels in a hybrid vehicle equipped with two or more different power sources, including an internal combustion engine.
2. Description of Related Art
Hybrid vehicles using an engine and a motor generator improve fuel efficiency of the vehicles by implementing an idle stop function and a regenerative braking function, on the basis of a technology of using power from the motor generator having relatively excellent low-velocity torque characteristics, as driving force at low velocity, and driving the vehicles using power from the engine having relatively excellent high-velocity torque characteristics at high velocity.
Further, hybrid vehicles do not produce exhaust gas from the engine when being driven only by a motor generator, which is recognized as an environmental-friendly vehicle technology having advantages of improving fuel efficiency and reducing exhaust gas.
A power train for a hybrid vehicle is provide with a variety of driving modes, such that, preferably, it can be efficiently driven while improving fuel efficiency and acceleration performance by shifting the driving modes in accordance with the traveling conditions of the vehicle, thereby improving the traveling performance of the vehicle.
The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Various aspects of the present invention are directed to provide a power train for a hybrid vehicle can achieve three or more fixed gear ratio modes where a vehicle is driven at a fixed gear ratio, such as shift stages of common transmission, only by the driving force of an engine without driving a motor generator, as well as an electric vehicle mode, which is the basic drive modes of a hybrid vehicle, and two or more power division modes including an input division mode and a composite mode, thereby driving the vehicle with high efficiency in accordance with traveling conditions of the vehicle and improving fuel efficiency.
An exemplary embodiment of the present invention provides a power train for a hybrid vehicle, which includes: two single planetary gear set having one rotary element, respectively, in which the rotary members are consistently connected, a first motor generator connected to a rotary element of a first planetary gear set, one of the single two planetary gear sets, a second motor generator connected to a rotary element of a second planetary gear set, the other of the two single planetary gear sets, an input element connected to any one of the rotary elements of the first planetary gear set, an output element connected to any one of the rotary elements not connected with the second motor generator, in the rotary elements of the second planetary gear set, and four torque transmission mechanisms connected to the rotary elements of the first planetary gear set and the second planetary gear set.
Another exemplary embodiment of the present invention provides a power train for a hybrid vehicle, which includes: a first planetary gear set that is a single planetary gear set, a second planetary gear set having one rotary element consistently connected with one rotary element of the first planetary gear set, a first motor generator connected to one rotary element of the first planetary gear set, a second motor generator connected with one rotary element of the second planetary gear set, an input element connected to any one of rotary elements of first planetary gear set, an output element connected to any one of rotary elements not connected with the second motor generator, in rotary elements of the second planetary gear set, a first clutch and a second clutch respectively connecting/disconnecting one rotary element of the first planetary gear set and one rotary element of the second planetary gear set, and a first brake and a second brake of which at least one is connected with any one of the other rotary elements not connected with the output element of the secondary planetary gear set.
Yet another exemplary embodiment of the present invention provides a power train for a hybrid vehicle, which includes: a first planetary gear set that is a single planetary gear set, a second planetary gear set having one rotary element consistently connected with one rotary element of the first planetary gear set, a first motor generator connected to one rotary element of the first planetary gear set, a second motor generator connected with one rotary element of the second planetary gear set, an input element connected to any one of rotary elements of first planetary gear set, an output element connected to any one of rotary elements not connected with the second motor generator, in rotary elements of the second planetary gear set, a first clutch connecting/disconnecting one rotary element of the first planetary gear set and one rotary element of the second planetary gear set, a second clutch connecting/disconnecting two rotary elements of the first planetary gear set, and a first brake and a second brake of which at least one is connected with any one of the other rotary elements not connected with the output element of the secondary planetary gear set.
According to the exemplary embodiments of the present invention, it is possible to achieve three or more fixed gear ratio modes where a vehicle is driven at a fixed gear ratio, such as shift stages of common transmission, only by the driving force of an engine without driving a motor generator, as well as an electric vehicle mode, which is the basic drive modes of a hybrid vehicle, and two or more power division modes including an input division mode and a composite mode, thereby driving the vehicle with high efficiency in accordance with traveling conditions of the vehicle and improving fuel efficiency.
The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description of the Invention, which together serve to explain certain principles of the present invention.
It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.
In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing.
Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.
The power trains for a hybrid vehicle according to the first to fourteenth exemplary embodiment, which are shown in the odd-numbered figures in
First planetary gear set PG1 includes a first sun gear S1, a first carrier C1, and a first ring gear R1, as the rotary elements, second planetary gear set PG2 includes a second sun gear S2, a second carrier C2, and second ring gear R2, as the rotary elements, the input element is an engine ENGINE consistently connected to first carrier C1, output element OUTPUT is consistently connected to second carrier C2, two of the four torque transmission mechanisms are clutches connecting/disconnecting two rotary members, and the others are brakes connecting/disconnecting rotary members to fixed members to stop rotation.
In this configuration, at least one of the two brakes is connected to any one of the second sun gear S2 and the second ring gear R2 of the second planetary gear set, the brakes are a first brake BK1 and a second brake BK2, and the clutches are a first clutch CL1 and a second clutch CL2.
In all of the first to eighth exemplary embodiments shown in the odd-numbered figures in
On the other hand, in all of the ninth to fourteenth exemplary embodiments shown in the odd-numbered figures in
In the first exemplary embodiment shown in
The operation modes of the first exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second ring gear R2 is reduced and outputted to second carrier C2, with second sun gear S2 fixed by first brake BK1.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, the output division mode is implemented by engaging only second clutch CL2, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the second exemplary embodiment shown in
The operation modes of the second exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second sun gear S2 is reduced and outputted to second carrier C2, with second ring gear R2 fixed by the first brake BK1.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, the output division mode is implemented by engaging only second clutch CL2, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the third exemplary embodiment shown in
The operation modes of the third exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second ring gear R2 is reduced and outputted to second carrier C2, with second sun gear S2 fixed by first brake BK1.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the fourth exemplary embodiment shown in
The operation modes of the fourth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second sun gear S2 is reduced and outputted to second carrier C2, with second ring gear R2 fixed by the first brake BK1.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, the output division mode is implemented by engaging only second clutch CL2, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the fifth exemplary embodiment shown in
The operation modes of the fifth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second ring gear R2 is reduced and outputted to second carrier C2, with second sun gear S2 fixed by first brake BK1.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, the output division mode is implemented by engaging only second clutch CL2, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the sixth exemplary embodiment shown in
The operation modes of the sixth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second sun gear S2 is reduced and outputted to second carrier C2, with second ring gear R2 fixed by first brake BK1 and the EV2 mode is implemented by engaging first clutch CL1 as well as first brake BK1 such that first carrier C1 is also fixed and the power from first motor generator MG1 can be added to the output, in addition to the power from second motor generator MG2.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, the output division mode is implemented by engaging only second clutch CL2, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the seventh exemplary embodiment shown in
The operation modes of the seventh exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second ring gear R2 is reduced and outputted across second carrier C2, with second sun gear S2 fixed by first brake BK1.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, the output division mode is implemented by engaging only second clutch CL2, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the eighth exemplary embodiment shown in
The operation modes of the eighth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second sun gear S2 is reduced and outputted to second carrier C2, with second ring gear R2 fixed by first brake BK1 and the EV2 mode is implemented by additionally engaging first clutch CL1 such that first carrier C1 is also fixed by first brake BK1 and the power from first motor generator MG1 can be added to the output.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, the output division mode is implemented by engaging only second clutch CL2, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the ninth exemplary embodiment shown in
The operation modes of the ninth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second sun gear S2 is reduced and outputted across second carrier C2, with second ring gear R2 fixed by the first brake BK1.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the tenth exemplary embodiment shown in
The operation modes of the tenth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second ring gear R2 is reduced and outputted across second carrier C2, with second sun gear S2 fixed by first brake BK1.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the eleventh exemplary embodiment shown in
The operation modes of the eleventh exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second ring gear R2 is reduced and outputted to second carrier C2, with second sun gear S2 fixed by first brake BK1 and the EV2 mode is implemented by additionally engaging first clutch CL1 such that first carrier C1 is fixed by first brake BK1 and the power from first motor generator MG1 can be further supplied to output element OUTPUT.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the twelfth exemplary embodiment shown in
The operation modes of the twelfth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second sun gear S2 is reduced and outputted to second carrier C2, with second ring gear R2 fixed by first brake BK1 and the EV2 mode is implemented by additionally engaging first clutch CL1 such that first carrier C1 is fixed by first brake BK1 and the power from first motor generator MG1 can be further supplied to output element OUTPUT.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the thirteenth exemplary embodiment shown in
The operation modes of the thirteenth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second ring gear R2 is reduced and outputted to second carrier C2, with second sun gear S2 fixed by first brake BK1 and the EV2 mode is implemented by additionally engaging first clutch CL1 such that first carrier C1 is fixed by first brake BK1 and the power from first motor generator MG1 can be further supplied to output element OUTPUT.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the fourteenth exemplary embodiment shown in
The operation modes of the fourteenth exemplary embodiment, as shown in the table of
The EV1 mode is implemented by driving second motor generator MG2 such that torque of second sun gear S2 is reduced and outputted to second carrier C2, with second ring gear R2 fixed by first brake BK1 and the EV2 mode is implemented by additionally engaging first clutch CL1 such that first carrier C1 is fixed by first brake BK1 and the power from first motor generator MG1 can be further supplied to output element OUTPUT.
The input division mode is implemented by engaging only first brake BK1, the composite division mode is implemented by engaging only first clutch CL1, and the fixed gear ratio mode makes the output of engine ENGINE transmitted to output element OUTPUT at various fixed gear ratios, as shown in
In the above, the first exemplary embodiment, second exemplary embodiments, fourth exemplary embodiment, fifth exemplary embodiment, sixth exemplary embodiment, seventh exemplary embodiment, and eighth exemplary embodiment implement three power division modes including the input division, composite division, and output division, and implement three or more fixed gear ratio modes, using two clutches and two brakes.
On the other hand, the sixth exemplary embodiment, eighth exemplary embodiment, twelfth exemplary embodiment, thirteenth exemplary embodiment, and fourteenth exemplary embodiment implement two or more power division modes including the input division and composite division, and can implement three or more fixed gear ratio modes and two EV modes including the EV2 mode that can simultaneously use first motor generator MP1 and second motor generator MG2.
In the exemplary embodiments of the present invention described above, the brakes may be implemented by a dry brake, a wet brake, a one-way brake, or a two-way brake, and the clutch may be implemented by a dry clutch, a wet clutch, or a two-way clutch.
Further, a dry or wet third clutch may be selectively mounted between the engine, which is an input element, and the other elements and a torsion damper having the function of torque limiters may be selectively mounted between the engine that is an input element and the other elements, in the exemplary embodiments described above. Therefore, as representative embodiments, a configuration implemented by adding a third clutch CL3 to the exemplary embodiment shown in
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.
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