JP2023079356A - Hybrid vehicle drive device - Google Patents

Abstract

To provide a hybrid vehicle drive device capable of reducing the costs of overall system.SOLUTION: In a hybrid vehicle drive device, a first motor generator and a first rotary element are coupled, an engine and a second rotary element are coupled, a wheel and a third rotary element are coupled, and a second motor generator and a forth rotary element are coupled. Transmission ratio between a third motor generator and the second rotary element/the third rotary element can be controlled continuously variably. If it is a predetermined engine torque or more, the first motor generator and the second motor generator receive the engine torque. If it is less than the predetermined engine torque and is a predetermined transmission ratio or more, the second motor generator receives the engine torque. If it is less than the predetermined engine torque and is less than a predetermined transmission ratio, the first motor generator receives the engine torque.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a hybrid vehicle drive system.

Patent Document 1 discloses a hybrid in which a power distribution device consisting of first and second planetary gear mechanisms is provided between an engine and wheels, and a first motor generator and a second motor generator are connected to the power distribution device. In a vehicle, a structure is disclosed in which a reaction force against an engine torque is borne by one of a first motor generator and a second motor generator, which has a low output.

Japanese Patent No. 4069901

In order for the first motor generator and the second motor generator to bear the engine maximum torque independently, it is necessary to use a high output motor generator, which increases the cost of the entire system. Therefore, in such a case, there has been a demand for a technique capable of reducing the cost of the entire system.

The present disclosure has been made in view of the above, and an object thereof is to provide a drive device for a hybrid vehicle that can reduce the cost of the entire system.

A drive device for a hybrid vehicle according to the present disclosure includes an engine, a first motor generator, a second motor generator, a third motor generator coupled to wheels so as to be able to transmit power, and an engine between the engine and the wheels. a power distribution device provided in a power transmission path and having a first rotating element, a second rotating element, a third rotating element, and a fourth rotating element that are differentially rotatable with each other, wherein the first motor generator and the The first rotating element is connected, the engine and the second rotating element are connected, the wheel and the third rotating element are connected, and the second motor generator and the fourth rotating element are connected. , in a hybrid vehicle drive device capable of steplessly controlling the gear ratio between the third motor generator and the second rotating element and the third rotating element, when the engine torque is equal to or greater than a predetermined engine torque; , the engine torque is received by the first motor generator and the second motor generator, and if the engine torque is less than a predetermined engine torque and is equal to or greater than a predetermined gear ratio, the engine torque is received by the second motor generator, and the engine torque is received by the predetermined engine When less than torque and less than a predetermined transmission ratio, the engine torque is received by the first motor-generator.

According to the present disclosure, the cost of the entire system can be reduced.

FIG. 1 is a skeleton diagram that schematically shows the configuration of a hybrid vehicle that includes a drive system according to an embodiment. FIG. 2 is a collinear chart when the vehicle speed is low (Ng1>Ng2) and Te is high (high engine torque) in the hybrid vehicle drive system according to the embodiment. FIG. 3 is a collinear chart at the time of high vehicle speed (Ng1<Ng2) and high Te (high engine torque) in the hybrid vehicle drive system according to the embodiment. FIG. 4 is a collinear chart at low vehicle speed (Ng1>Ng2) and low Te (low engine torque) in the hybrid vehicle drive system according to the embodiment. FIG. 5 is a collinear chart at high vehicle speed (Ng1<Ng2) and low Te (low engine torque) in the hybrid vehicle drive system according to the embodiment. FIG. 6 is a graph showing Tg (motor generator torque) versus Te (engine torque) at low vehicle speeds (Ng1>Ng2) in the hybrid vehicle drive system according to the embodiment. FIG. 7 is a graph showing Tg (motor generator torque) versus Te (engine torque) at high vehicle speeds (Ng1<Ng2) in the hybrid vehicle drive system according to the embodiment. FIG. 8 is a flowchart showing the operation of the hybrid vehicle drive system according to the embodiment.

A hybrid vehicle drive system according to an embodiment of the present disclosure will be described with reference to the drawings. Components in the following embodiments include components that can be easily replaced by those skilled in the art, or components that are substantially the same.

(Device configuration)
FIG. 1 is a skeleton diagram that schematically shows the configuration of a hybrid vehicle 1 that includes a drive system according to an embodiment of the invention. As shown in the figure, the hybrid vehicle 1 includes an engine 10, an output shaft 11, a power distribution mechanism 20, a first motor generator (MG1) 30, a second motor generator (MG2) 40, and a rotating shaft ( MG 2-axis) 41, a counter driven gear 42, a counter shaft 43, a counter drive gear 44, a differential 45, an axle 46 to which wheels are coupled, a third motor generator (MG 3) 50, a rotating shaft (MG 3-axis ) 51 and .

Note that FIG. 1 shows only those components of the hybrid vehicle 1 that are necessary for realizing the present invention, and other components (eg, an ECU (Electronic Control Unit), a battery, an inverter, wheels, etc.). is omitted.

The engine 10 converts combustion energy of fuel into rotational motion of an output shaft 11 and outputs the rotational motion. The output shaft 11 is connected to the first carrier 22 of the power distribution mechanism 20 and transmits its rotational motion to the power distribution mechanism 20 .

The power distribution mechanism 20 is arranged between the engine 10 and the axle 46 (wheel), and distributes the power of the engine 10 to the first motor generator 30 and the second motor generator 40 and the axle 46 (output side). ) and The power distribution mechanism 20 has two single pinion planetary gear mechanisms. The power distribution mechanism 20 also includes a first rotating element, a second rotating element, a third rotating element, and a fourth rotating element that are differentially rotatable with each other.

Specifically, the power distribution mechanism 20 includes a first sun gear 21, a first carrier 22, a first ring gear 23, a first pinion gear 24, a second sun gear 25, a second carrier 26, and a second ring gear. 27 and a second pinion gear 28 . Among the components of the power distribution mechanism 20, the first sun gear 21, the first carrier 22, the first ring gear 23 and the first pinion gear 24 constitute a first planetary gear mechanism. Among the components of the power distribution mechanism 20, the second sun gear 25, the second carrier 26, the second ring gear 27 and the second pinion gear 28 constitute a second planetary gear mechanism.

First sun gear 21 is connected to first motor generator 30 . This first sun gear 21 functions as a “first rotating element” of the power distribution mechanism 20 . The first carrier 22 is connected with the engine 10 via the output shaft 11 . This first carrier 22 functions as a “second rotating element” of the power distribution mechanism 20 .

The first ring gear 23 is connected with the second carrier 26 . The first pinion gear 24 is rotatably supported by the first carrier 22 and meshes with the first sun gear 21 and the first ring gear 23 respectively.

The second sun gear 25 is connected to the second motor generator 40 via the rotating shaft 41 . This second sun gear 25 functions as a “fourth rotating element” of the power distribution mechanism 20 . The second carrier 26 is connected with the first ring gear 23 . Also, the second carrier 26 is connected to an axle 46 (wheel) via a first ring gear 23 , a counter driven gear 42 , a counter shaft 43 , a counter drive gear 44 and a differential 45 . This second carrier 26 functions as a “third rotating element” of the power distribution mechanism 20 .

The second ring gear 27 is connected with the first carrier 22 . The second pinion gear 28 is rotatably supported by the second carrier 26 and meshes with the second sun gear 25 and the second ring gear 27, respectively.

First motor generator 30, second motor generator 40, and third motor generator 50 are connected to a battery (not shown) via an inverter (not shown). This inverter is composed of an electric circuit that enables power transfer between the motor generators. Further, the third motor generator 50 is connected to the axle 46 (wheel) so as to be able to transmit power.

The counter driven gear 42 is connected to the counter drive gear 44 via the counter shaft 43 . Also, the counter driven gear 42 is connected to the third motor generator 50 via the rotating shaft 51 . The counter drive gear 44 meshes with the differential ring gear 45 a of the differential 45 . Wheels (driving wheels) (not shown) are connected to the differential 45 via left and right axles 46 .

In the hybrid vehicle 1 having the driving device as described above, it is possible to control the state of the hybrid vehicle 1 to the continuously variable transmission state. In this continuously variable transmission state, the gear ratio between the second rotating element (first carrier 22) and the third rotating element (second carrier 26) in the power distribution mechanism 20 is controlled steplessly.

Further, in the hybrid vehicle drive system according to the embodiment, the reaction force of the engine torque is controlled so that at least one of the first motor generator 30 and the second motor generator 40 bears the reaction force of the engine torque according to the engine torque and the gear ratio. .

FIG. 2 is a collinear chart when the hybrid vehicle 1 has a low vehicle speed (Ng1>Ng2) and a high Te (high engine torque). FIG. 3 is a collinear chart when the hybrid vehicle 1 has a high vehicle speed (Ng1<Ng2) and a high Te (high engine torque). "Ng1" indicates the number of rotations of the first motor generator 30, "Ng2" indicates the number of rotations of the second motor generator 40, and "Te" indicates the engine torque. 2 and 3, "S1" is the first sun gear 21, "C1" is the first carrier 22, "R1" is the first ring gear 23, "S2" is the second sun gear 25, and " "C2" indicates the second carrier 26 and "R2" indicates the second ring gear 27, respectively.

In the hybrid vehicle drive system according to the embodiment, as shown in FIGS. 2 and 3, when the engine torque is equal to or greater than a predetermined engine torque, the first motor generator 30 and the second motor generator 40 generate a reaction torque of the engine torque. receive power.

FIG. 4 is a collinear chart when the hybrid vehicle 1 is at low vehicle speed (Ng1>Ng2) and low Te (low engine torque). FIG. 6 is a graph showing Tg (motor generator torque) with respect to Te (engine torque) when the vehicle speed is low (Ng1>Ng2).

6, "Tg1" is the torque of the first motor generator 30, "Tg2" is the torque of the second motor generator 40, "ρ" is the gear ratio of the power distribution mechanism 20, and "ρ1" is the power distribution mechanism 20. (Specifically, the value obtained by dividing the number of teeth of the first sun gear 21 by the number of teeth of the first ring gear 23), "ρ2" is the first planetary gear mechanism that constitutes the power distribution mechanism 20 A gear ratio of one planetary gear mechanism (specifically, a value obtained by dividing the number of teeth of the second sun gear 25 by the number of teeth of the second ring gear 27), and "Te_max" is the upper limit torque of the engine torque.

In the hybrid vehicle drive system according to the embodiment, as shown in FIGS. 4 and 6, when the engine torque is less than a predetermined engine torque and equal to or greater than a predetermined gear ratio, the second motor generator 40 reduces the engine torque. receive a reaction force.

FIG. 5 is a collinear chart when the hybrid vehicle 1 is at high vehicle speed (Ng1<Ng2) and low Te (low engine torque). FIG. 7 is a graph showing Tg (motor generator torque) with respect to Te (engine torque) when the vehicle speed is high (Ng1<Ng2).

As shown in FIGS. 5 and 7 , when the engine torque is less than a predetermined engine torque and less than a predetermined gear ratio, the reaction force of the engine torque is received by the first motor generator 30 .

(motion)
The operation of the hybrid vehicle drive system according to the embodiment will be described with reference to FIG. It should be noted that the operation described with reference to FIG. 1 is specifically performed mainly by the ECU of the hybrid vehicle 1 .

8, "Ng1" is the rotation speed of the first motor generator 30, "Ng2" is the rotation speed of the second motor generator 40, "Te" is the engine torque, and "Tg1_max" is the upper limit of the first motor generator 30. torque, "Tg2_max" is the upper limit torque of the second motor generator 40, and "ρ1" is the gear ratio of the first planetary gear mechanism that constitutes the power distribution mechanism 20 (specifically, the number of teeth of the first sun gear 21 is the first value divided by the number of teeth of the ring gear 23), and "ρ2" is the gear ratio of the first planetary gear mechanism constituting the power distribution mechanism 20 (specifically, the number of teeth of the second sun gear 25 is divided by the number of teeth of the second ring gear 27). divided by a number).

First, it is determined whether or not "Ng1>Ng2" (step S1). If it is determined in step S1 that "Ng1>Ng2" (Yes in step S1), it is determined whether or not "Te<Tg2_max/(ρ1/(ρ1+1))" (step S2).

In step S2, when it is determined that "Te<Tg2_max/(ρ1/(ρ1+1))" (Yes in step S2), Tg1 is set to "0" and Tg2 is set to "Te*ρ2" (step S3 ) to complete the process.

In step S2, if it is determined that it is not "Te<Tg2_max/(ρ1/(ρ1+1))" (No in step S2), Tg1 is set to "(Te−Tg2_max*ρ2)*ρ1/(ρ1+1)", In addition, Tg2 is set to "Tg2_max" (step S4), and this processing is completed.

If it is determined in step S1 that "Ng1>Ng2" is not satisfied (No in step S1), it is determined whether "Te<Tg1_max/(ρ1/(ρ1+1))" is satisfied (step S5).

If it is determined in step S5 that "Te<Tg1_max/(ρ1/(ρ1+1))" (Yes in step S5), Tg1 is set to "Te*ρ1/(ρ1+1)" and Tg2 is set to "0". (step S6), and this process is completed.

If it is determined in step S5 that it is not "Te<Tg1_max/(ρ1/(ρ1+1))" (No in step S5), Tg1 is set to "Tg1_max" and Tg2 is set to "(Te−Tg1_max/(ρ1/ (ρ1+1)))*ρ2” (step S7), and the process is completed.

In the hybrid vehicle drive system according to the embodiment described above, when the engine torque is equal to or greater than the predetermined engine torque, the reaction force of the engine torque is received by the first motor generator 30 and the second motor generator 40, and the engine torque is less than the predetermined engine torque, When the gear ratio is equal to or greater than the predetermined gear ratio, the reaction force of the engine torque is received by the second motor generator 40. When the gear ratio is less than the predetermined engine torque and the gear ratio is less than the predetermined gear ratio, the engine torque receive the reaction force of

As a result, the maximum torque (upper limit torque) of the first motor generator 30 and the second motor generator 40 can be lowered, so the cost of the entire system can be reduced.

Further advantages and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and equivalents thereof.

1 hybrid vehicle 10 engine 11 output shaft 20 power distribution mechanism 21 first sun gear 22 first carrier 23 first ring gear 24 first pinion gear 25 second sun gear 26 second carrier 27 second ring gear 28 second pinion gear 30 first motor generator 40 Second Motor Generator 41 Rotating Shaft 42 Counter Driven Gear 43 Counter Shaft 44 Counter Drive Gear 45 Differential 45a Differential Ring Gear 46 Axle 50 Third Motor Generator 51 Rotating Shaft

Claims (1)

An engine, a first motor-generator, a second motor-generator, a third motor-generator connected to the wheels so as to be able to transmit power, and a power transmission path provided between the engine and the wheels, and mutually differential a power distribution device having a rotatable first rotating element, a second rotating element, a third rotating element and a fourth rotating element,
the first motor generator and the first rotating element are connected,
the engine and the second rotating element are connected,
the wheel and the third rotating element are connected,
the second motor generator and the fourth rotating element are connected,
A drive device for a hybrid vehicle capable of steplessly controlling a gear ratio between the third motor generator and the second rotating element and the third rotating element,
if the engine torque is equal to or higher than a predetermined engine torque, the engine torque is received by the first motor generator and the second motor generator;
When the torque is less than a predetermined engine torque and equal to or greater than a predetermined gear ratio, the engine torque is received by the second motor generator,
If less than a predetermined engine torque and less than a predetermined gear ratio, the engine torque is received by the first motor generator;
Drive system for hybrid vehicles.

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