JP7144972B2 - vehicle - Google Patents

Description

The present invention relates to vehicles such as hybrid vehicles.

Patent Literature 1 discloses that muffled sound is generated when the vehicle body resonates due to vibrations from a drive source. In Patent Document 1, the booming noise is suppressed by increasing the required engine speed and decreasing the required engine torque.

JP 2010-285144 A

Some hybrid vehicles have a configuration in which the driving force of the engine and the driving force of the driving motor can be distributed between the front wheels and the rear wheels. In this vehicle, the driving force of the engine and the driving force of the driving motor are transmitted to the rear wheels via the propeller shaft and the rear differential gear.

In such a vehicle, muffled noise may occur in a very low vehicle speed range of about 0.8 km/h to 1 km/h. The muffled sound may make people in the vehicle feel uncomfortable.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle capable of suppressing muffled noise.

In order to solve the above-described problems, a vehicle according to the present invention includes an engine, a driving motor generator, and an electronic control system for controlling the distribution of the driving force transmitted from the engine and the driving motor generator to the side of the driven wheels. A control coupling, a propeller shaft provided between the electronically controlled coupling and the driven wheels for transmitting the driving force distributed to the driven wheels to the driven wheels, and between the propeller shaft and the driven wheels and a coupling control section, and the coupling control section controls any one of the engine and the driving motor generator when driving force is distributed to the driven wheels by the electronically controlled coupling. It is determined whether the number of revolutions and torque of either or both of the engine and the motor/generator for driving are within a predetermined range, and if the number of revolutions and torque of either or both of the engine and the driving motor generator are within a predetermined range, a predetermined priority condition is set. If the priority condition is not met, the electronically controlled coupling performs specific distribution control to make the driving force distributed to the driven wheel side less than or equal to the driving force distributed immediately before to the driven wheel side. If the priority condition is satisfied, the electronically controlled coupling is not allowed to perform specific distribution control .

In addition, the predetermined range of the engine and driving motor-generator rotation speeds is set in a relatively low rotation speed range, and the predetermined range of the engine and driving motor-generator torque is set in a relatively high torque range. may be

Moreover, the priority condition may include at least one of the conditions that the turning angle is equal to or greater than a predetermined turning angle, that a slip has occurred, and that the climbing angle is equal to or greater than a predetermined climbing angle.

According to the present invention, it is possible to suppress muffled sound.

1 is a schematic diagram showing the configuration of a vehicle according to this embodiment; FIG. 1 is a schematic diagram showing a power transmission system of a vehicle; FIG. 4 is a flow chart showing the operation of a coupling control unit; It is a figure which shows an example of the table in which the rotation speed and the torque were related.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a schematic diagram showing the configuration of a vehicle 1 according to this embodiment. In FIG. 1, the signal flow is indicated by dashed arrows. FIG. 2 is a schematic diagram showing the power transmission system of the vehicle 1. As shown in FIG. The vehicle 1 is a series-parallel type (power split type) hybrid vehicle. The configuration of the vehicle 1 will be described with reference to FIGS. 1 and 2. FIG.

The vehicle 1 includes an engine 10, a power split device 12, a motor generator 14 for power generation, inverters 16 and 17, a battery 18, a motor generator 20 for driving, a reduction mechanism 22, a front differential gear 24, front wheels 26, an electronically controlled coupling 30, It includes a propeller shaft 32 , a rear differential gear 34 , a rear wheel 36 and a control section 50 . The vehicle 1 divides the power of the engine 10 into driving power and power generation power, and drives the front wheels and the rear wheels with the combined driving power of the engine 10 and the driving power of the driving motor.

The engine 10 is, for example, a reciprocating engine, and includes cylinders, pistons, connecting rods, and crankshafts (not shown). The piston reciprocates within the cylinder in response to combustion of the air-fuel mixture. The crankshaft rotates through the connecting rod in response to the reciprocating motion of the pistons. In the engine 10, power is generated by rotation of the crankshaft.

As shown in FIG. 2, a crankshaft 10a of the engine 10 is connected to a damper 10b. The damper 10b suppresses variations in the torque transmitted from the engine 10, and transmits the suppressed torque to the gear mechanism 11 via the rotating shaft 10c. The gear mechanism 11 is composed of a first gear 11a and a second gear 11b that mesh with each other. The first gear 11a is fitted on the rotating shaft 10c. The second gear 11b is fitted on the input shaft 11c. The torque transmitted to the gear mechanism 11 is transmitted to the power split mechanism 12 via the input shaft 11c.

The power split device 12 is connected to the engine 10 , the electric motor generator 14 , the front differential gear 24 and the electronically controlled coupling 30 . The power split device 12 splits the power of the engine 10 into power that rotates the electric motor generator 14 and power that rotates the front wheels 26 and the rear wheels 36 .

The power split device 12 includes planetary gears including a sun gear 12a, a planetary gear 12b, a ring gear 12c, and a carrier 12d. The sun gear 12a is fitted to the rotating shaft 14a of the motor generator 14 for power generation. A plurality of planetary gears 12b are arranged between the sun gear 12a and the ring gear 12c, and mesh with the sun gear 12a and the ring gear 12c, respectively. The planetary gear 12b is rotatably supported in the circumferential direction of the sun gear 12a by a carrier 12d. The carrier 12d is fitted on the input shaft 11c. The ring gear 12c rotates according to the rotation of the planetary gear 12b. The ring gear 12c is fitted on the input reduction shaft 12e.

The input reduction shaft 12 e transmits torque to the shaft portion 31 via the power split reduction gear 13 . The power split reduction gear 13 is composed of a first gear 13a and a second gear 13b that mesh with each other. The first gear 13a is fitted on the input reduction shaft 12e. The second gear 13 b is fitted on the shaft portion 31 .

A transfer drive gear 23 is connected to the shaft portion 31 . The transfer drive gear 23 is composed of a first gear 23a and a second gear 23b that mesh with each other. The first gear 23 a is fitted on the shaft portion 31 . The second gear 23b is fitted on the propeller shaft 23c. Propeller shaft 23 c is connected to front differential gear 24 .

Front differential gear 24 is connected to front wheels 26 via drive shaft 25 . The front differential gear 24 includes, for example, a ring gear connected to the propeller shaft 23c, a frame rotating together with the ring gear, a pinion gear supported by the frame, and two side gears meshing with the pinion gear. Left and right drive shafts 25 are connected to the two side gears, respectively. The front differential gear 24 absorbs the rotational difference between the left and right drive shafts 25 and transmits the driving force transmitted via the power split mechanism 12 and the speed reduction mechanism 22 to the left and right drive shafts 25 . The driving force transmitted to the left and right drive shafts 25 is transmitted to the left and right front wheels 26 .

The electric power generation motor generator 14 is rotated by the power of the engine 10 divided by the power split device 12 to generate electric power. That is, the electric power generation motor generator 14 mainly functions as a generator. Motor generator 14 for power generation supplies electric power to motor generator 20 for driving and battery 18 via inverter 16 .

The inverter 16 converts the AC power generated by the power generation motor generator 14 into DC power and supplies the DC power to the battery 18 (charging the battery 18). Further, the inverter 16 converts the DC power supplied from the battery 18 into desired AC power and supplies it to the motor generator 14 for power generation.

The inverter 17 converts the AC power generated by the drive motor generator 20 into DC power and supplies the DC power to the battery 18 (charging the battery 18). Further, the inverter 17 converts the DC power supplied from the battery 18 into desired AC power and supplies it to the driving motor generator 20 .

Drive motor generator 20 mainly functions as an electric motor. Drive motor generator 20 rotates according to the AC power supplied from inverter 16 . The drive motor generator 20 is connected to an electronically controlled coupling 30 and a front differential gear 24 via a speed reduction mechanism 22 . Driving motor generator 20 drives front wheels 26 and rear wheels 36 via speed reduction mechanism 22 .

Reduction mechanism 22 reduces the rotational speed of driving motor generator 20 and transmits the driving force of driving motor generator 20 to front differential gear 24 and electronically controlled coupling 30 .

The reduction mechanism 22 includes planetary gears including a sun gear 22a, a planetary gear 22b, a ring gear 22c, and a carrier 22d. The sun gear 22a is fitted to the rotary shaft 20a of the motor generator 20 for driving. The ring gear 22c is fixed to the casing. A plurality of planetary gears 22b are arranged between the sun gear 22a and the ring gear 22c, and mesh with the sun gear 22a and the ring gear 22c, respectively. The planetary gear 22b is rotatably supported in the circumferential direction of the sun gear 22a by a carrier 22d. Carrier 22 d is connected to shaft 31 .

A reduction shaft 31b is connected to the shaft portion 31 via a spline 31a. An electronically controlled coupling 30 is connected to the reduction shaft 31b.

One end of a propeller shaft 32 is connected to the electronically controlled coupling 30 . The other end of propeller shaft 32 is connected to rear differential gear 34 . The propeller shaft 32 extends in the longitudinal direction of the vehicle 1 from the vicinity of the front wheels 26 to the vicinity of the rear wheels 36, for example.

Rear differential gear 34 is connected to rear wheels 36 via drive shaft 35 . The rear differential gear 34 includes, for example, a ring gear connected to the propeller shaft 32, a frame rotating together with the ring gear, a pinion gear supported by the frame, and two side gears meshing with the pinion gear. Left and right drive shafts 35 are connected to the two side gears, respectively. The rear differential gear 34 transmits the driving force transmitted through the propeller shaft 32 to the left and right drive shafts 35 while absorbing the rotational difference between the left and right drive shafts 35 . The driving force transmitted to the left and right drive shafts 35 is transmitted to the left and right rear wheels 36 .

The electronically controlled coupling 30 includes, for example, a clutch. The electronically controlled coupling 30 controls the engagement force between the clutches by controlling the pressure applied to the clutches. As a result, the electronically controlled coupling 30 controls the distribution of the driving force transmitted to the rear wheels 36 . In the electronically controlled coupling 30, pressurization to the clutch is controlled by current instructions.

In this specification, the front wheels 26 to which driving force is constantly applied from the engine 10 and the driving motor generator 20 when the vehicle 1 is running are sometimes referred to as main driving wheels. Further, in this specification, the rear wheels 36 to which the driving force of the engine 10 and the driving motor generator 20 are selectively applied by the electronically controlled coupling 30 are sometimes referred to as driven wheels.

As shown in FIG. 1 , the vehicle 1 is provided with a vehicle speed sensor 40 , a steering angle sensor 42 , a brake control unit 44 and a gyro sensor 46 . A vehicle speed sensor 40 detects the vehicle speed of the vehicle 1 . The steering angle sensor 42 detects the steering angle of the vehicle 1 . The brake control unit 44 detects the number of revolutions of the left and right front wheels 26 and the number of revolutions of the left and right rear wheels 36 . A gyro sensor 46 detects the tilt angle of the vehicle 1 . The vehicle speed sensor 40, the steering angle sensor 42, the brake control unit 44, and the gyro sensor 46 transmit the detected vehicle speed, steering angle, rotation speeds of the front wheels 26 and the rear wheels 36, and the tilt angle of the vehicle 1 to the control unit 50. .

The control unit 50 is, for example, an ECU (Engine Control Unit). The control unit 50 is composed of a semiconductor integrated circuit including a central processing unit (CPU), a ROM storing programs and the like, a RAM as a work area, and the like, and controls the vehicle 1 as a whole. The control unit 50 functions as a drive control unit 52 and a coupling control unit 54 by executing programs.

The drive control unit 52 drives the engine so that the torque and rotation speed of the engine 10 become the target torque and target rotation speed. Further, the drive control unit 52 controls on/off of the switching element of the inverter 16 so that the torque and rotation speed of the driving motor generator 20 become the target torque and target rotation speed. A detailed description of the drive control unit 52 will be omitted.

The coupling control unit 54 controls the engagement force between the clutches in the electronically controlled coupling 30 to control the driving force transmitted to the rear wheel 36 side.

Further, when the rotational speed and torque of either one or both of the engine 10 and the drive motor generator 20 are within a predetermined range, the coupling control unit 54 distributes the torque to the rear wheel 36 side to the electronically controlled coupling 30. Specific distribution control is performed to make the driving force less than or equal to the driving force distributed immediately before to the rear wheel 36 side. The coupling control unit 54 will be detailed later.

Here, in a series-parallel type hybrid vehicle such as the vehicle 1, muffled noise may occur in an extremely low speed range of about 0.8 km/h to 1 km/h. The muffled sound is a low-frequency sound such as a boom, and sounds muffled on the floor of the vehicle 1 .

A muffled sound is generated as follows. For example, it is assumed that the engine 10 and the driving motor generator 20 rotate at a speed of about 80 Hz to 100 Hz and the vehicle speed is about 0.8 km/h to 1 km/h. In this case, vibration corresponding to the rotational speeds of engine 10 and drive motor generator 20 is transmitted to propeller shaft 32 .

Here, it is assumed that the resonance frequency of the propeller shaft 32 is between 80 Hz and 100 Hz. In such a case, the vibrations transmitted to the propeller shaft 32 are resonated and amplified in the propeller shaft 32 .

Vibrations amplified by propeller shaft 32 are transmitted to rear differential gear 34 . The vibration transmitted to the rear differential gear 34 causes the case of the rear differential gear 34 to vibrate. Vibration of the case of the rear differential gear 34 vibrates the mount that supports the case of the rear differential gear 34 . Vibration of the mount vibrates the floor attached to the mount. Then, the floor vibrates at a frequency of about 80 Hz to 100 Hz, resulting in muffled sound.

In addition, as the torque of the engine 10 and the motor generator 20 for driving is relatively large, the amplitude of the vibration transmitted to the propeller shaft 32 becomes large, and the muffled sound becomes louder.

If such muffled noise occurs, it may make people in the vehicle feel uncomfortable. Therefore, the muffled sound is suppressed in the vehicle 1 of the present embodiment.

FIG. 3 is a flow chart showing the operation of the coupling control section 54. As shown in FIG. The coupling control unit 54 normally controls the electronically controlled coupling 30 so that the driving force of the engine 10 and the driving motor generator 20 is appropriately distributed between the front wheels 26 and the rear wheels 36 . That is, normally, the vehicle 1 runs in four-wheel drive. In this state, the coupling control unit 54 executes a series of processes shown in FIG. 3 at predetermined interrupt timings, for example.

First, the coupling control unit 54 acquires the rotational speed and torque of the engine 10 (S100). For example, the coupling control unit 54 derives the current rotation speed of the engine 10 based on the crank angle (the rotation angle of the crankshaft) detected by a crank angle sensor (not shown). Further, the coupling control unit 54 derives the torque of the motor generator 14 for power generation based on the output of the motor generator 14 for power generation and the rotational angular velocity of the motor generator 14 for power generation. Then, the coupling control unit 54 derives the torque of the engine 10 based on the torque of the power generation motor generator 14 and the power split ratio in the power split device 12 .

Next, the coupling control unit 54 determines whether or not the rotational speed and torque of the engine 10 are within predetermined ranges (S110). The predetermined range corresponds to a criterion for determining whether or not the number of rotations is such that the booming noise is generated, and whether or not the torque is sufficient to make the booming noise audible. That is, when the rotation speed and torque of the engine 10 are within a predetermined range, the coupling control unit 54 regards the rotation speed at which the muffled sound is generated and the torque at which the muffled sound is sufficiently audible.

If the rotational speed and torque of engine 10 are within the predetermined ranges (YES in S110), coupling control unit 54 proceeds to the process of step S140.

On the other hand, if the rotation speed and torque of engine 10 are not within the predetermined range (NO in S110), coupling control unit 54 acquires the rotation speed and torque of driving motor generator 20 (S120). For example, the coupling control unit 54 derives the rotational speed of the drive motor generator 20 based on the rotational angular velocity of the drive motor generator 20 . Further, the coupling control unit 54 derives the torque of the driving motor-generator 20 based on the output of the driving motor-generator 20 and the rotational angular velocity of the driving motor-generator 20 .

Next, coupling control unit 54 determines whether or not the rotational speed and torque of drive motor generator 20 are within a predetermined range (S130). This predetermined range is the same as the predetermined range in step S110. In other words, when the rotation speed and torque of the drive motor generator 20 are within a predetermined range, the coupling control unit 54 regards the rotation speed at which the muffled sound is generated and the torque at which the muffled sound is sufficiently audible.

If the rotational speed and torque of drive motor generator 20 are within the predetermined range (YES in S130), coupling control unit 54 proceeds to the process of step S140. On the other hand, if the rotational speed and torque of drive motor generator 20 are not within the predetermined ranges (NO in S130), coupling control unit 54 terminates the series of processes.

FIG. 4 is a diagram showing an example of a table in which rotation speeds and torques are associated. The table in FIG. 4 is used in combination with the engine 10 and the motor generator 20 for driving. The horizontal axis represents the rotation speed (rpm) of the engine 10 or the motor generator 20 for driving, and the vertical axis represents the torque (N·m) of the engine 10 or the motor generator 20 for driving. This table is created in advance by, for example, computer analysis (CAE), experiments, or the like.

In FIG. 4, the predetermined range for the number of rotations is set between a lower limit threshold ThR1 and an upper limit threshold ThR2. A predetermined range (between the lower limit threshold value ThR1 and the upper limit threshold value ThR2) of the engine speed is set to a relatively low engine speed range. For example, the lower threshold ThR1 is 80 Hz and the upper threshold ThR2 is 100 Hz. This is because the resonance frequency of propeller shaft 32 is generally between 80 Hz and 100 Hz.

Further, in FIG. 4, the predetermined range of torque is set between the lower limit threshold ThT1 and the upper limit threshold ThT2. A predetermined range of torque (between the lower limit threshold ThT1 and the upper limit threshold ThT2) is set to a relatively high torque range. This is because the greater the torque, the greater the amplitude of resonance. The lower threshold ThT1 and the upper threshold ThT2 are determined, for example, by experiments.

In FIG. 4, hatching indicates a region A1 in which the rotational speed and torque are within a predetermined range. In other words, the hatched area A1 corresponds to an area where muffled sound is generated and is sufficiently audible. Coupling control unit 54 operates within a sufficiently audible muffled sound when the rotational speed and torque of either one or both of engine 10 and drive motor generator 20 are values within hatched area A1. , and the process proceeds to step S140.

Returning to FIG. 3, in step S140, the coupling control unit 54 determines whether or not the priority condition is satisfied.

Here, the priority condition is a criterion indicating whether the vehicle 1 needs to be maintained in four-wheel drive. The priority conditions are, for example, that the steering angle is greater than or equal to a predetermined steering angle, that a slip occurs, and that the climbing angle is greater than or equal to a predetermined climbing angle. If even one of these conditions is satisfied, the coupling control unit 54 determines that the priority condition is satisfied. On the other hand, the coupling control unit 54 determines that the priority condition is not satisfied when all these conditions are not satisfied.

For example, the coupling control unit 54 acquires the steering angle detected by the steering angle sensor 42 and determines whether or not the steering angle is greater than or equal to a predetermined steering angle. When the steering angle is equal to or greater than a predetermined steering angle, the coupling control unit 54 determines that the vehicle 1 is turning and that the priority condition is satisfied.

Further, the coupling control unit 54 acquires the number of rotations of the left and right front wheels 26 and the number of rotations of the left and right rear wheels 36 from the brake control unit 44, and calculates the average value of the number of rotations of the left and right front wheels 26 (front wheel average value). , and the average value of the rotation speeds of the left and right rear wheels 36 (rear wheel average value) is larger than a predetermined value. When the difference between the front wheel average value and the rear wheel average value is larger than a predetermined value, the coupling control unit 54 determines that the vehicle 1 is slipping and that the priority condition is satisfied.

Further, the coupling control unit 54 acquires the tilt angle in the longitudinal direction of the vehicle 1 from the gyro sensor 46, and determines whether or not the tilt angle is equal to or greater than a predetermined tilt angle. When the tilt angle in the longitudinal direction of the vehicle 1 is equal to or greater than the predetermined tilt angle, the coupling control unit 54 determines that the uphill angle is equal to or greater than the predetermined uphill angle, and that the priority condition is satisfied. The predetermined inclination angle (predetermined slope angle) is set to the limit slope angle for two-wheel drive.

If the priority condition is satisfied (YES in S140), the coupling control unit 54 terminates the series of processes. On the other hand, if the priority condition is not satisfied (NO in S140), the coupling control unit 54 causes the electronically controlled coupling 30 to distribute the driving force to the driven wheels (rear wheels 36) to the driven wheels (rear wheels 36). ) side is controlled to make the driving force less than or equal to the previously distributed driving force (S150).

For example, the coupling control unit 54 transmits to the electronically controlled coupling 30 a current instruction that causes the engagement force between the clutches in the electronically controlled coupling 30 to be zero or a value close to zero. The electronically controlled coupling 30 reduces the pressure between the clutches in accordance with this current instruction to bring the engagement force between the clutches to zero or a value close to zero. As a result, almost all of the driving force of the engine 10 and the driving motor generator 20 is transmitted to the main driving wheels (front wheels 26), and almost no driving force is transmitted to the driven wheels (rear wheels 36).

Note that the coupling control unit 54 is not limited to a mode in which the driving force transmitted to the rear wheels 36 is set to zero or a value close to zero. The coupling control unit 54 controls the driving force transmitted to the rear wheel 36 just before the determination result of step S110 becomes YES or the determination result of step S130 becomes YES and the determination result of step S140 becomes NO. Also, the driving force transmitted to the rear wheel 36 side should be reduced. For example, the coupling control unit 54 may update the driving force ratio between the front wheels 26 and the rear wheels 36 from 5:5 to 9:1. A specific driving force ratio such as 9:1 may be determined, for example, by experimentation.

Although not shown in the flowchart of FIG. 3, when the specific distribution control is being performed, the rotation speed and torque of the engine 10 are outside the predetermined range, and the rotation speed and torque of the drive motor generator 20 are within the predetermined range. If it is out of the range or if the priority condition is satisfied, the coupling control unit 54 restores the original driving force ratio before performing the specific distribution control.

As described above, in the vehicle 1 of the present embodiment, when the rotational speed and torque of either one or both of the engine 10 and the driving motor generator 20 are within a predetermined range, the driving force distributed to the driven wheels is The driving force distributed immediately before to the driven wheels is reduced. Therefore, in the vehicle 1 of the present embodiment, transmission of vibrations to the propeller shaft 32 corresponding to the rotational speeds of the engine 10 and the driving motor generator 20 is suppressed under conditions where muffled noise is generated. Accordingly, in the vehicle 1 of the present embodiment, resonance of the propeller shaft 32 and transmission of vibration to the rear differential gear 34 are suppressed.

As a result, in the vehicle 1 of the present embodiment, floor vibration via the case and mount of the rear differential gear 34 is suppressed. Therefore, according to the vehicle 1 of this embodiment, muffled sound can be suppressed.

Further, when the rotational speed and torque of either engine 10 or drive motor generator 20 are within a predetermined range, vibration of a frequency component corresponding to the rotational speed within the predetermined range occurs. However, in the vehicle 1 of the present embodiment, when the rotational speed and torque of either one of the engine 10 and the drive motor generator 20 are within a predetermined range, specific distribution control is performed, so booming noise is reliably suppressed. be able to.

Further, in the motor generator 20 for driving, compared to the engine 10, the rotation speed is easily maintained in a low rotation speed range of about 80 Hz to 100 Hz. However, in the vehicle 1 of the present embodiment, when the rotation speed and torque of not only the engine 10 but also the driving motor generator 20 are within a predetermined range, specific distribution control is performed, so that booming noise can be reliably suppressed. can be done.

When the rotational speeds of the engine 10 and the driving motor generator 20 are between the lower limit threshold ThR1 and the upper limit threshold ThR2 and the torque of the engine 10 and the driving motor generator 20 is smaller than the lower limit threshold ThT1, the propeller shaft 32 resonance occurs. However, in this case, since the torques of engine 10 and drive motor generator 20 are smaller than lower limit threshold value ThT1, even if propeller shaft 32 resonates, the amplitude of vibration transmitted to rear differential gear 34 is small. Therefore, in this case, even if a muffled sound occurs, the sound is not so loud as to be noticed by people inside the vehicle. Therefore, when the torque of the engine 10 and the motor generator 20 for driving is smaller than the lower limit threshold ThT1, even if the rotational speeds of the engine 10 and the motor generator for driving 20 are between the lower limit threshold ThR1 and the upper threshold ThR2, is not a problem.

In addition, in the vehicle 1 of the present embodiment, when the priority condition is not satisfied under the situation where muffled sound is generated, the specific distribution control is performed, and when the priority condition is satisfied, the specific distribution control is not performed. In other words, the vehicle 1 of the present embodiment is in two-wheel drive ( For example, it is not switched to front drive drive, and four-wheel drive is maintained. Therefore, the vehicle 1 of this embodiment can be driven more safely.

In the present embodiment, the priority conditions are that the turning angle is equal to or greater than a predetermined turning angle, that a slip occurs, and that the climbing angle is equal to or greater than the predetermined climbing angle. However, the priority condition is not limited to the aspect including all of these conditions. The priority condition may include at least one of the conditions that the steering angle is greater than or equal to a predetermined steering angle, that a slip occurs, and that the climbing angle is greater than or equal to the predetermined climbing angle. . Also, the priority conditions may include conditions other than these conditions.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such embodiments. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the claims, and it should be understood that these also belong to the technical scope of the present invention. be done.

INDUSTRIAL APPLICABILITY The present invention can be used for vehicles such as hybrid vehicles.

1 Vehicle 10 Engine 20 Driving Motor Generator 30 Electronic Control Coupling 32 Propeller Shaft 34 Rear Differential Gear 36 Rear Wheel 54 Coupling Control Unit

Claims (3)

engine and
a driving motor generator;
an electronically controlled coupling that controls the distribution of the driving force transmitted to the driven wheels from among the driving forces of the engine and the driving motor generator;
a propeller shaft provided between the electronically controlled coupling and the driven wheels for transmitting the driving force distributed to the driven wheels to the driven wheels;
a differential gear provided between the propeller shaft and the driven wheels;
a coupling control unit;
with
The coupling control unit is
Determining whether the rotational speed and torque of one or both of the engine and the driving motor generator are within a predetermined range when the driving force is distributed to the driven wheels by the electronically controlled coupling. death,
determining whether a predetermined priority condition is satisfied when the rotational speed and torque of either or both of the engine and the driving motor generator are within a predetermined range;
If the priority condition is not satisfied, causing the electronically controlled coupling to perform a specific distribution control in which the driving force to be distributed to the driven wheel side is made equal to or less than the driving force distributed to the driven wheel side immediately before;
A vehicle that does not allow the electronically controlled coupling to perform the specific distribution control when the priority condition is satisfied . The predetermined range of rotation speeds of the engine and the driving motor generator is set in a relatively low rotation speed region, and the predetermined range of the torque of the engine and the driving motor generator is set in a relatively high torque region. 2. The vehicle of claim 1, wherein . 2. The priority condition includes at least one of a steering angle greater than or equal to a predetermined steering angle, slippage occurring, and a hill-climbing angle greater than or equal to a predetermined hill-climbing angle. 2. The vehicle described in 2.

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