JP4118157B2 - Hybrid vehicle drive system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving gear of a hybrid car in which a power loss of a first drive force source can be suppressed. <P>SOLUTION: The driving gear of the hybrid car includes a power distributing unit for distributing the power of the first drive force source to a motor generator and wheels, a second drive force source coupled to a power transmission route from the power distributing unit to the wheels, and a transmission disposed between the second drive force source and a power transmission member for realizing a setting of a plurality of gear shifting ratios. The driving gear of the hybrid car further includes a first power transmission state controller for controlling the state of the power transmission route from the second drive force source to the power transmission route. Further, the driving gear of the hybrid car also includes a first power transmission suppressing means (steps S2, S4 and S6) for suppressing the transmission of the power of the first drive force source to the second drive source source by the first power transmission state controller when the power of the first drive force source is transmitted to the wheels via the power transmission route. <P>COPYRIGHT: (C)2004,JPO&amp;NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive device for a hybrid vehicle having a plurality of drive force sources.
[0002]
[Prior art]
In recent years, a hybrid vehicle has been proposed that is equipped with an engine that outputs torque by burning fuel and a motor / generator that outputs torque by supplying electric power, and that can transmit the torque of the engine and motor / generator to wheels. Yes. In such a hybrid vehicle, driving and stopping of the engine and the motor / generator are controlled based on various conditions, thereby improving fuel efficiency, reducing noise, and reducing exhaust gas. ing.
[0003]
As described above, an example of a hybrid vehicle equipped with a plurality of types of driving force sources is described in Japanese Patent Laid-Open No. 9-117010 (Patent Document 1). In the hybrid vehicle described in this publication, the output shaft of the engine is connected to the carrier of the planetary gear unit, and the first counter drive gear is connected to the ring gear of the planetary gear unit. The power of the first counter drive gear is configured to be transmitted to the differential device via the counter driven gear, the differential pinion gear, and the differential ring gear. The sun gear of the planetary gear unit is connected to a rotor of a generator and is provided with a brake for controlling rotation / stop of the rotor. Further, an electric motor is provided, a second counter drive gear is connected to the rotor of the electric motor, and the second counter drive gear and the counter driven gear are engaged with each other.
[0004]
In the hybrid vehicle described in the above publication, the engine can be started by the generator, the engine drive mode for driving only the engine, the motor drive mode for driving only the electric motor, the engine and the electric motor are driven. It is said that the hybrid vehicle can be driven in the engine / motor drive mode. That is, not only the torque generated by the engine can be transmitted to the counter driven gear, but also the torque generated by the electric motor can be transmitted to the counter driven gear. Furthermore, it is supposed that the rotor of the generator can be fixed by engaging a brake. A technique related to a hybrid vehicle having a plurality of driving force sources is also described in Japanese Patent Application Laid-Open No. 11-332020 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2002-225578 (Patent Document 3).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-117010 (paragraph numbers 0013 to 0021, FIG. 1)
[Patent Document 2]
Japanese Patent Laid-Open No. 11-332020 [Patent Document 3]
JP 2002-225578 A [0006]
[Problems to be solved by the invention]
However, in the hybrid vehicle described in the above-mentioned Japanese Patent Application Laid-Open No. 9-117010, the second counter drive gear connected to the rotor of the electric motor and the counter driven gear are always meshed. For this reason, even in the engine drive mode in which only the engine is driven, the rotor of the electric motor is rotated by the power of the engine, which may increase the power loss.
[0007]
The present invention has been made against the background described above, and an object of the present invention is to provide a drive device for a hybrid vehicle that can suppress the power loss of the first drive force source.
[0008]
[Means for Solving the Problem and Action]
To achieve the above object, the invention of claim 1 is directed to a power distribution device that distributes the power of the first driving force source to the motor / generator and the wheels, and the power transmission from the power distribution device to the wheels. A hybrid vehicle having a second driving force source coupled to a path, and a transmission that is arranged between the second driving force source and the power transmission path and that can set a plurality of gear ratios. in the driving device, said second the rewritable controlling power transmission state between the driving power source and the power transmission path, and the first power transmitting state controller is provided for changing the speed ratio of the transmission together are, when the power of the first driving power source is transmitted to the wheels via the power transmission path, the power transmission between the front Symbol power transmission path and the second driving power source , The first power transmission state control It is an invention which is characterized in that comprises a first power transmission suppression means you interrupted by location.
[0009]
According to the first aspect of the invention, the power of the first driving force source is distributed to the motor / generator and the wheels via the power distribution device. Further, the power of the second driving power source, when transmitted to the wheels via the power transmission path, the function of the first power transmitting state controller, any of a plurality of gear ratios in the variable speed machine Is set. On the other hand, without transmitting the power of the second driving power source to the wheels, when the power of the first driving power source is transmitted to the wheels via the power transmission path, the power transmission path and the second drive Power transmission to and from the force source is interrupted by the first power transmission state control device. Therefore, it is not necessary to provide a dedicated device for interrupting power transmission between the power transmission path and the second driving force source.
[0010]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, a second power transmission state control device for suppressing the rotation of the motor / generator is provided, and the first driving force at a low vehicle speed is provided. A function for permitting the power of the power source to be transmitted to the motor / generator, and a function for permitting the power of the second driving force source to be transmitted to the power transmission path at a low vehicle speed. a first rotation control means has, at the time of high vehicle speed, the function of suppressing by said motor generator and the second power transmitting state controller rotation, at a high speed, the second driven before Symbol driveline the power transmission between the power source, an invention which is characterized in that a second rotation control means having a function and you cut off by the first power transmitting state controller.
[0011]
According to the invention of claim 2, in addition to the effect similar to that of the invention of claim 1, the power of the first driving force source is permitted to be transmitted to the motor generator at low vehicle speed, and The power of the second driving force source is permitted to be transmitted to the power transmission path. On the other hand, at high vehicle speeds, the rotation of the motor / generator is suppressed, and power transmission between the power transmission path and the second driving force source is interrupted .
[0012]
The invention according to claim 3, in addition to the first aspect or 2, pre SL is a first driving power source is an engine, the second drive power source is the electric motor, the power distribution system, concentric A planetary gear mechanism having a sun gear and a ring gear arranged in a shape and a carrier holding a pinion gear meshing with the sun gear and the ring gear. The carrier is connected to the engine, and the sun gear is connected to the motor / generator. The invention is characterized in that the ring gear is connected to the power transmission path .
[0013]
According to the invention of claim 3, effects similar to the invention of claim 1 or 2 is arising.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be specifically described with reference to the drawings. FIG. 2 is a schematic configuration diagram of a hybrid vehicle (hereinafter abbreviated as “vehicle”) Ve of an FR (front engine / rear drive; engine front and rear wheel drive) type according to an embodiment of the present invention. In FIG. 2, the vehicle Ve has an engine as a first driving force source.
[0015]
As the engine 1, an internal combustion engine, specifically, a gasoline engine, a diesel engine, an LPG engine, or the like can be used. An input shaft 4 is connected to the crankshaft 2 of the engine 1 via a damper mechanism 3. A casing 5 is provided, and a generator 6 and an electric motor 7 are provided inside the casing 5. As the electric motor 7 and the generator 6, a motor / generator having both a power running function for converting electrical energy into mechanical energy and a regeneration function for converting mechanical energy into electrical energy can be used. The generator 6 has a stator 8 and a rotor 9, and the stator 8 is fixed to the casing 5.
[0016]
A power distribution device 10 is provided inside the casing 5. The power distribution device 10 is constituted by a so-called single pinion type planetary gear mechanism. That is, the power distribution device 10 has a sun gear 12 formed on the hollow shaft 11, a ring gear 13 disposed concentrically with the sun gear 12, and a carrier 15 holding a pinion gear 14 that meshes with the sun gear 12 and the ring gear 13. is doing. The input shaft 4 and the carrier 15 are coupled so as to rotate integrally. Moreover, the input shaft 4 is arrange | positioned in the hollow shaft 11, and the input shaft 4 and the hollow shaft 11 are relatively rotatable. Furthermore, a resolver 16 is provided for detecting the rotational state of the rotor 9 of the generator 6, specifically the rotational angular acceleration and the rotational speed. Furthermore, a brake B0 that permits or restricts the rotation of the hollow shaft 11, the rotor 9, and the sun gear 12 is provided.
[0017]
On the other hand, the electric motor 7 has a stator 17 and a rotor 18. The stator 17 is fixed to the casing 5. Further, a transmission 19 is provided inside the casing 5, and the transmission 19 is mainly configured by a so-called planetary gear mechanism. That is, the transmission 19 integrally includes a sun gear 20 and a ring gear 21 that are concentrically arranged, a large-diameter pinion gear 22 and a small-diameter pinion gear 23 that rotate together, a short pinion gear 50, a large-diameter pinion gear 22, and a small-diameter pinion gear 23. revolve in holds, and, and a carrier 24 holding the short pinion gears 50. Short pinion gear 50, large-diameter pinion gear 22, sun gear 20, and ring gear 21 are meshed with each other.
[0018]
An output shaft 25 is connected to the carrier 24 so as to rotate integrally, and the input shaft 4 and the output shaft 25 are arranged concentrically. Further, the output shaft 25 and the ring gear 13 of the power distribution device 10 are connected so as to rotate integrally. A hollow shaft 26 is disposed outside the output shaft 25, and the output shaft 25 and the hollow shaft 26 are relatively rotatable. The hollow shaft 26 and the rotor 18 of the electric motor 7 are connected so as to rotate integrally. Furthermore, a resolver 27 is provided for detecting the rotational state of the rotor 18 of the electric motor 7, specifically, the rotational angular acceleration and the rotational speed.
[0019]
Further, the hollow shaft 26 and the sun gear 20 are coupled so as to rotate integrally. Furthermore, a gear 28 that meshes with the small-diameter pinion gear 23 is provided, and a brake B1 that permits or restricts the rotation of the gear 28 is provided. Furthermore, a brake B2 that permits or restricts the rotation of the ring gear 21 is provided.
[0020]
The output shaft 25 and the input member (not shown) of the differential 29 are connected, and the output member (not shown) of the differential 29 and the drive shaft 30 are connected. Further, wheels 31 are connected to the drive shaft 30.
[0021]
Next, a control system of the vehicle Ve will be described. First, an electronic control device 32 is provided, and signals such as a vehicle speed, an acceleration request, a braking request, a rotation state of the generator 6 and a rotation state of the electric motor 7 are input to the electronic control device 32. The electronic control device 32 outputs a signal for controlling the engine 1, a signal for controlling the generator 6, a signal for controlling the electric motor 7, and a signal for controlling the brakes B0, B1, and B2.
[0022]
Next, control of the vehicle Ve will be described. First, when the engine 1 is started when the vehicle Ve is stopped, the generator 1 can be driven to crank the engine 1. Specifically, when the brake B0 is released (OFF) and the torque of the generator 6 is transmitted to the sun gear 12, the ring gear 13 becomes a reaction force element in a state where the vehicle Ve is stopped, and the carrier 15 Rotates. The torque of the carrier 15 is transmitted to the crankshaft 2 via the input shaft 4. In this way, the engine 1 is cranked, and if the engine 1 is a gasoline engine, fuel injection control and ignition control are performed, and the engine 1 rotates autonomously.
[0023]
During operation of the engine 1, the torque of the engine 1 is transmitted to the output shaft 25 via the crankshaft 2, the input shaft 4, the carrier 15, and the ring gear 13. The torque of the output shaft 25 is transmitted to the wheel 31 via the differential 29 and the drive shaft 30, and a driving force is generated.
[0024]
Next, a control example of the brakes B0, B1, and B2 and a control example of the electric motor 7 will be described based on the flowchart of FIG. The flowchart of FIG. 1 is a routine showing a driving mode switching process. First, the required torque to be transmitted to the wheel 31 is determined based on the acceleration request and the vehicle speed V, and the state of each brake B0, B1, B2 is detected (step S1).
[0025]
Following this step S1, it is determined whether the travel mode is the low speed mode or the high speed mode (step S2). This travel mode is determined based on vehicle speed, required torque, and the like. For example, when the vehicle speed is equal to or lower than a predetermined vehicle speed and the required torque is equal to or higher than the first predetermined torque, it is determined that the low speed mode is set. On the other hand, when the vehicle speed exceeds the predetermined vehicle speed and the required torque is less than the first predetermined torque, it is determined that the high-speed mode is set.
[0026]
If it is determined in step S2 that the vehicle is in the low speed mode, the brake B0 is released, the brake B1 is released, the brake B2 is engaged (ON) (step S3), and the process returns. When the process of step S3 is executed, the engine torque is transmitted to the wheels 31 via the power distribution device 10, the output shaft 25, and the differential 29. In addition, the motor 7 is driven, the ring gear 21 becomes a reaction force element, the torque of the sun gear 20 is transmitted to the differential 29 via the carrier 24, and the torque of the differential 29 is transmitted to the wheels 31. That is, the rotational speed of the electric motor 7 is decelerated by the transmission 19 and the torque of the electric motor 7 is transmitted to the output shaft 25. The transmission 19 has a large gear ratio, so-called “low”. In this way, the torques of both the engine 1 and the electric motor 7 are transmitted to the wheels 31. That is, the torque transmitted to the wheel 31 can be supplemented (assisted) by the torque of the electric motor 7. In step S3, the torque of the carrier 15 can be transmitted to the rotor 9 of the generator 6, and the generator 6 can generate power.
[0027]
On the other hand, if it is determined in step S2 that the high speed mode is selected, it is determined whether or not the torque to be output from the electric motor 7 is equal to or less than zero (step S4). In step S4, it is determined whether or not the required torque is equal to or lower than a second predetermined torque lower than the first predetermined torque. The negative determination in step S4 means that a part of the required torque is borne by the torque of the electric motor 7. That is, it means the normal mode of the high speed modes. Therefore, if a negative determination is made in step S4, the brake B0 and the brake B2 are released, the brake B1 is engaged (step S5), and the process returns.
[0028]
When the processing of step S5 is executed, the electric motor 7 is driven, the gear 28 becomes a reaction force element, the torque of the sun gear 20 is transmitted to the differential 29 via the carrier 24, and the torque of the differential 29 is changed. It is transmitted to the wheel 31. That is, the rotational speed of the electric motor 7 is decelerated by the transmission 19 and the torque of the electric motor 7 is transmitted to the output shaft 25. Note that the transmission ratio of the transmission 19 in step S5 is so-called “high”, which is smaller than the transmission ratio of the transmission 19 in step S3. In this way, the torques of both the engine 1 and the electric motor 7 are transmitted to the wheels 31. In step S5, the torque of the carrier 15 can be transmitted to the rotor 9 of the generator 6 and the generator 6 can generate power. Thus, the vehicle Ve is a so-called mechanical distribution type hybrid vehicle in which the power of the engine 1 is distributed to the generator 6 and the wheels 31 by the power distribution device 10.
[0029]
On the other hand, if a positive determination is made in step S4, it means that a part of the required torque is not borne by the motor 7. That is, it means that the cruise mode of the high speed mode is selected. Therefore, if a positive determination is made in step S4, the brake B1 and the brake B2 are released, the brake B0 is engaged (step S6), and the process returns.
[0030]
As described above, in the control example of FIG. 1, the normal mode and the cruise mode are included in the high-speed mode, and when proceeding to step S6, the cruise mode is selected. Since the brakes B1 and B2 are released in step S6, the power transmission is substantially cut off in the power transmission path between the output shaft 25 and the electric motor 7. For this reason, when the power of the engine 1 is transmitted to the wheels 31 via the output shaft 25 and the differential 29, a part of the power of the engine 1 is not transmitted to the electric motor 7, and the rotor 18 does not rotate. . Therefore, power loss of the engine 1 can be suppressed, and a reduction in fuel consumption can be suppressed.
[0031]
In step S6, since the brake B0 is also engaged, the rotor 9 of the generator 6 does not rotate when the power of the engine 1 is transmitted from the input shaft 4 to the output shaft 25. Therefore, power loss of the engine 1 can be further suppressed, and fuel consumption can be further suppressed. In step S6, the two brakes B1 and B2 that are released to prevent the rotation of the rotor 18 also have a function of switching the transmission ratio of the transmission 19. In step S3, one brake B1 is released and the brake B2 is engaged. In step S6, the brakes B1 and B2 are both released. Therefore, it is not necessary to provide a dedicated device to prevent the rotor 18 from rotating, and it is possible to avoid an increase in the number of parts and an increase in the size and weight of the drive device.
[0032]
Here, the correspondence between the functional means shown in FIG. 1 and the configuration of the present invention will be described. Steps S2, S4 and S6 are the first power transmission suppressing means and the second rotation of the present invention. It corresponds to the control means, and steps S2 and S3 correspond to the first rotation control means of the present invention. The engine 1 corresponds to the first driving force source of the present invention, the generator 6 corresponds to the motor / generator of the present invention, the output shaft 25 corresponds to the power transmission path of the present invention, and the electric motor 7 Corresponds to the second driving force source of the present invention, and the low and high gear ratios set by the transmission 19 correspond to a plurality of gear ratios of the present invention, and the brakes B1 and B2 correspond to the present invention. The brake B0 corresponds to the second power transmission state control device of the present invention, the low speed mode corresponds to the low vehicle speed of the present invention, and the high speed mode corresponds to the first power transmission state control device of the present invention. This corresponds to the high vehicle speed of the invention. The high speed mode includes the cruise mode described in step S6, that is, the case where the vehicle speed exceeds the predetermined vehicle speed and the required torque is less than the first predetermined torque.
[0033]
In step S6, when the brakes B1 and B2 are released, the state of the power transmission path between the output shaft 25 and the electric motor 7 is substantially cut off from the power transmission. For this reason, it is also possible to paraphrase the brakes B1 and B2 as a power transmission cutoff mechanism.
[0034]
As an actuator for engaging / releasing the brakes B0, B1, and B2, a hydraulic actuator, an electric actuator, an electromagnetic actuator, or the like can be used. Further, as the brakes B0, B1, and B2, a multi-plate friction engagement device including a plurality of annular plates, a synchronizer device having a spline fitting mechanism, or the like can be used.
[0035]
The first power transmission suppressing means described in the claims is read as the first power transmission suppressing device or the first power transmission suppressing controller, and the first rotation control means is replaced with the first rotation. It can also be read as a controller or a first rotation control controller, and the second rotation control means can be read as a second rotation controller or a second rotation control controller. In this case, the electronic control device 32 corresponds to each device and each controller. Further, the first power transmission suppression means is replaced with the first power transmission suppression step, the first rotation control means is replaced with the first rotation control step, and the second rotation control means is replaced with the second rotation. It can be read as a control step, and a hybrid vehicle drive device can be read as a hybrid vehicle drive method.
[0036]
【The invention's effect】
According to the present invention as described above, when the power of the first driving power source is transmitted by way of the power transmission path to the wheels, between the power transmission path and the second driving power source The power transmission in can be interrupted by the first power transmission state control device . Therefore, the power loss of the first driving force source can be suppressed . In addition, it is not necessary to provide a dedicated device in order to prevent the power of the first driving force source from being transmitted to the second driving force source. Therefore, it is possible to suppress an increase in the number of parts and an increase in size and weight of the drive device.
[0037]
According to the second aspect of the invention, the same effect as the first aspect of the invention can be obtained, and at the high vehicle speed, the rotation of the motor / generator can be suppressed, and the power transmission path and the second driving force can be controlled. Power transmission to and from the power source can be interrupted by the first power transmission state control device . Therefore, the power loss of the first driving force source at the time of high vehicle speed can be suppressed.
[0038]
According to the invention of claim 3, it is possible to obtain the same effect as the invention of claim 1 or 2.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an embodiment of the present invention.
FIG. 2 is a conceptual diagram showing a power train and control system of a hybrid vehicle to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Engine, 6 ... Generator, 7 ... Electric motor, 10 ... Power distribution device, 19 ... Transmission, 25 ... Output shaft, 31 ... Wheel, B0 ... Second power transmission state control device, B1, B2 ... First Power transmission state control device, Ve ... vehicle (hybrid vehicle).

Claims (3)

A power distribution device that distributes the power of the first driving force source to the motor / generator and the wheels; a second driving force source connected to a power transmission path from the power distribution device to the wheels; A drive device for a hybrid vehicle, which is disposed between the driving force source and the power transmission path and has a transmission capable of setting a plurality of gear ratios.
The rewritable controls power transmission state between the second driving power source and the power transmission path, the first power transmitting state control device is provided for changing the speed ratio of the transmission,
If the power of the first driving power source is transmitted to the wheels via the power transmission path, the power transmission between the front Symbol power transmission path and the second driving power source, the first hybrid vehicle driving apparatus characterized by comprising a first power transmission suppression means you interrupted by 1 of the power transmission state controller. A second power transmission state control device for suppressing rotation of the motor / generator;
The function of permitting the power of the first driving force source to be transmitted to the motor generator at low vehicle speed, and the power of the second driving power source is transmitted to the power transmission path at low vehicle speed. A first rotation control means having a function of allowing
At high speed, the function of suppressing by said motor generator and the second power transmitting state controller rotation, at a high speed, the power transmission between the front Symbol power transmission path and the second driving power source the hybrid vehicle driving apparatus according to claim 1, characterized in that a second rotation control means having a function and you cut off by the first power transmitting state controller. Before SL is a first driving power source is an engine, the second drive power source is an electric motor, the power distributing device includes a sun gear and a ring gear arranged concentrically, a pinion gear that meshes with the sun gear and the ring gear A planetary gear mechanism having a held carrier, wherein the carrier is connected to the engine, the sun gear is connected to the motor / generator, and the ring gear is connected to the power transmission path. The hybrid vehicle drive device according to claim 1 or 2.

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