KR101330692B1 - Circling drive control system with torque vectoring device and control method thereof - Google Patents

Abstract

The present invention relates to a turning driving control system to which a torque vectoring device is applied and a control method thereof. A power transmission unit for transmitting driving force from an engine and a transmission to a wheel, and differentially transmitting driving force transmitted from the power transmission unit to left and right wheels. The differential unit, the torque transmission unit for transmitting a portion of the driving force transmitted from the power transmission unit to the outer wheel when the left or right turning, the sensing unit for detecting whether the vehicle is turning and driving state information and the driving state information of the sensing unit And a control unit for controlling the driving of the torque transmission unit to increase the torque applied to the outer ring by determining whether to turn or not and turning based on the driving.
By using the turning driving control system to which the torque vectoring device as described above and the control method thereof are applied, by adjusting and increasing the torque applied to the outer wheel during turning driving according to the driving state information, smooth corner escape is possible and the cornering performance is improved. You can.

Description

CIRCLING DRIVE CONTROL SYSTEM WITH TORQUE VECTORING DEVICE AND CONTROL METHOD THEREOF}

The present invention relates to a turning driving control system to which a torque vectoring device is applied and a control method thereof, and more particularly, to a turning driving control system to which a torque vectoring device is applied to improve rotational driving stability by applying rotational force to an outer wheel when the vehicle rotates. It relates to a control method thereof.

Torque Vectoring system is a system that actively distributes the vehicle's left / right torque to improve vehicle agility and stability.

That is, the torque vectoring system transmits the torque of the turning inner ring to the turning outer ring when the understeer occurs, and improves vehicle agility, and improves the turning stability by transmitting the torque of the turning outer ring to the inner ring when the oversteer occurs.

Conventional differentials generally distribute torque between drive wheels.

However, torque vectoring systems applied to conventional differentials increase the torque applied to the drive wheels outside the curve to help drive and steer the car around the curve, especially at high speeds. When is particularly advantageous.

Such a conventional torque vectoring system is disclosed in Korean Patent Publication No. 10-2006-0049993 (published May 19, 2006, hereinafter referred to as 'Patent Document 1') and Korean Patent Publication No. 10-2011-0006674 (2011). It is disclosed in many publications, such as January 20, 1, the following "patent document 2".

A differential device capable of vectorizing torque according to Patent Document 1 includes axle shafts that receive at least a part of the torque applied to the cage while receiving a speed change between the cage and the axle shafts rotating about the main shaft by the applied torque. Gear device in the cage for dispensing between the first planetary set, disposed between the cage and the left axle shaft, and, when applied, a reaction torque applied to the first planetary set such that the first planetary set applies torque between the cage and the left axle shaft. A first brake connected to the first planetary set for transmission, a second planetary set disposed between the cage and the right axle shaft and, when applied, a reaction torque applied to the second planetary set such that the second planetary set is connected between the cage and the right axle shaft. And a second brake connected with the second planetary set to transmit torque at the.

That is, the differential device according to Patent Document 1 distributes the torque generated by the engine of the vehicle to two axle shafts that rotate about the main axis and are connected to wheels disposed on the left and right sides of the vehicle, respectively. By selectively vectoring the torque transmitted to the two shafts, one of the shafts can transmit a greater torque than the other, thereby improving driving stability during rotation of the vehicle.

However, the differential device according to Patent Document 1 applies a torque to the outer wheel during rotational running of the vehicle, and applies a reaction torque to the inner wheel to brake the inner wheel.

Accordingly, the differential device according to Patent Document 1 has a problem that a power loss occurs due to braking of the inner wheel of the vehicle.

The torque vectoring device according to patent document 2 is connected to the drive shaft and extends through the device and is eccentrically axially with respect to the drive shaft, respectively, in an engaged state intended for connecting the drive shaft to one of the two gear sleeves. Two hydraulically controlled disc clutches spline coupled to the eccentric tube, torque transmission having a gear ratio of 1: 1 between the eccentric tube and the differential case sleeve and coaxial with the drive shaft and forming part of the differential case of the differential on the drive axle Having a mechanism, a torque vectoring device is connected to the differential.

However, since the torque vectoring system according to Patent Documents 1 and 2 is equipped with a complex device such as a planetary set or a brake device, a disc clutch or an eccentric tube, a torque transmission mechanism, the configuration is complicated and the weight is increased, and the product There was a problem that the production cost of the rise.

Republic of Korea Patent Publication No. 10-2006-0049993 (published May 19, 2006) Republic of Korea Patent Publication No. 10-2011-0006674 (published 20 January 2011)

The present invention is to solve the above problems, an object of the present invention is to adjust the driving force applied to the outer wheel and the inner wheel during driving of the vehicle turning driving control system to which the torque vectoring device is applied to improve the driving stability And a control method thereof.

Another object of the present invention is to provide a turning driving control system and a control method thereof, to which a torque vectoring device is applied, which applies a driving force to an outer wheel during turning of a vehicle and prevents power loss due to braking of an inner wheel of a conventional torque vectoring device. .

According to a feature of the present invention for achieving the object as described above, the present invention provides a power transmission unit for transmitting a driving force to the wheel from the engine and the transmission, the driving force transmitted from the power transmission unit differential to the left and right wheels Differential unit for transmitting to the left, right or right turning driving part of the torque transmission unit for transmitting a portion of the driving force transmitted from the power transmission unit to the outer wheel, sensing unit for detecting whether the vehicle is turning and driving state information and driving of the sensing unit It includes a control unit for controlling the driving of the torque transmission unit to increase the torque applied to the outer ring by determining whether or not to turn based on the state information.

The torque transmission unit is connected to the clutch pack installed in the drive shaft, the first and second drive wheels selectively connected to the clutch pack during the turning operation of the vehicle, and receive driving force, and the first and second drive wheels, respectively. And first and second transmission parts for transmitting the driving force transmitted from the pack to the left wheel or the right wheel.

The first and second transmission parts are first and second gears engaged with the first and second drive wheels, respectively, and third and fourth installed on first and second rotation shafts of the first and second gears, respectively. And first and second side gears which are installed to be engaged with the third gear and the fourth gear on the left side and the right side of the axle to receive the driving force, wherein the third gear, the first side gear, and the fourth gear The second side gear is characterized in that the bevel gear for transmitting the driving force in the vertical direction.

The sensing unit may include at least two of a steering wheel angle sensor, a steering wheel speed sensor, a vehicle speed sensor, a wheel speed sensor, a yaw rate sensor, and an accelerator pedal position sensor.

The driving state information includes the current driving speed, acceleration, steering angle, rotation speed and yaw rate information of each wheel, and the control unit is outside the driving force close to all of the driving force transmitted to the axle during the turning start acceleration of the vehicle The torque transmission unit is controlled to be transmitted to the wheels, and the torque transmission unit is controlled to transmit the driving force of 5 to 20% of the driving force transmitted to the axle to the outer wheel during the high-speed turning of the vehicle.

According to another feature of the present invention, the present invention comprises the steps of (a) detecting the driving state information of the vehicle when driving starts, (b) checking whether the vehicle is turning using the driving state information and (c) As a result of the inspection of the step (b), the step of transmitting a portion of the driving force transmitted to the axle through the drive shaft during the driving of the vehicle characterized in that it comprises a step of increasing the torque.

In the step (c), it is determined whether or not the vehicle oscillation acceleration is accelerated based on the driving state information, and when the vehicle oscillation acceleration is accelerated, the driving force close to the entire driving force transmitted to the axle is transmitted to the outer wheel of the vehicle. It features.

Step (c) checks whether the vehicle is turning at high speed on the basis of the driving state information, and controls to transmit driving force of 5 to 20% of the driving force transmitted to the axle to the outer wheel of the vehicle during the turning at high speed. It is characterized by.

As described above, the present invention can increase the torque applied to the outer wheel at the time of turning by using a torque vectoring device of a simple structure provided on the drive shaft.

In particular, the present invention can adjust the torque applied to the outer ring by adjusting the pressing force of the clutch pack provided in the torque vectoring device according to the driving state information.

Accordingly, the present invention can be smooth corner escape during turning driving to improve the cornering performance, to prevent over / under steering to improve yaw stability.

In another aspect, the present invention can increase the safety area without the intervention of the electronic stability program (ESP) to improve the safety driving speed when turning.

As a result, the present invention improves the fuel economy of the vehicle by minimizing unnecessary fuel consumption by adjusting and increasing torque applied to the outer wheel according to various conditions such as rain, snow, ice, turning oscillation acceleration, and high-speed turning driving. Has the effect.

1 is a block diagram of a turning driving control system to which a torque vectoring device is applied according to a preferred embodiment of the present invention;
FIG. 2 is a detailed configuration diagram of the torque vectoring device shown in FIG. 1;
3 is a flowchart illustrating a step-by-step control method of a turning driving control system to which a torque vectoring device according to an embodiment of the present invention is applied;
4 is an operational state diagram for explaining a control method of the turning driving control system shown in FIG.

Hereinafter, a turning driving control system to which a torque vectoring device according to a preferred embodiment of the present invention is applied and a control method thereof will be described in detail with reference to the accompanying drawings.

In the present embodiment, for convenience of description, a rear wheel drive type vehicle that drives the rear wheels using the power of the engine will be described. However, the present invention is not limited thereto.

That is, it should be noted that the present invention can be applied to both the front wheel and the rear wheel of a four-wheel drive vehicle.

In the present embodiment, the wheel located outside the rotation center of the two wheels is called the 'outer wheel', and the wheel located inside the rotation center is called the 'inner wheel'.

For example, as shown in FIG. 4, when the vehicle turns in the left direction, the right wheel becomes the outer wheel and the left wheel becomes the inner wheel.

On the other hand, when the vehicle is turning in the right direction, it should be noted that the right wheel becomes the inner wheel and the left wheel becomes the outer wheel.

1 is a block diagram of a turning driving control system to which a torque vectoring device is applied, and FIG. 2 is a detailed block diagram of the torque vectoring device shown in FIG. 1.

In the turning driving control system to which the torque vectoring device 10 according to the preferred embodiment of the present invention is applied, as shown in FIG. 1, the power transmission unit 11 transmitting the driving force from the engine and the transmission 1 to the wheels 2. ), A differential unit 12 which differentially transfers the driving force transmitted from the power transmission unit 11 to the left and right wheels, and a portion of the driving force transmitted to the power transmission unit 11 when the left or right turning is driven. Determining whether or not to turn in the left or right direction based on the detection signal from the torque transmission unit 13, the vehicle turning and the sensing unit 14 and the sensing unit 14 for detecting the driving state information transmitted to the It includes a control unit 15 for controlling the drive of the torque transmission unit 13 to increase the torque applied to the outer ring.

As shown in FIG. 2, the power transmission unit 11 includes a drive shaft 21 receiving the driving force of the engine and the transmission 1, and a longitudinal reduction gear 22 installed at the rear end of the drive shaft 21. The longitudinal reduction gear 22 has a drive pinion 23 and a ring gear 24 meshed with each other in a vertical direction.

The differential unit 12 is installed on the axle 25 to distribute and transmit the driving force transmitted from the drive shaft 21 so that the left wheel 3 and the right wheel 4 rotate at different rotational speeds when the vehicle turns. Play a role.

The differential unit 12 is a generally known differential device, and a description of the detailed configuration of the differential unit 12 will be omitted.

In this case, the differential unit 12 has a characteristic of always transmitting the same torque to the left wheel 3 and the right wheel (4).

For example, in a vehicle to which the differential unit 12 is applied, when the outside wheel slips as the center of the vehicle moves toward the outer ring side while the driving force cannot be transmitted to the opposite inner wheel while the vehicle turns to the outer ring side, the differential unit 12 Is operated to increase the rotational speed of the outer ring and reduce the rotational speed of the inner ring.

According to the operation of the differential unit 12, since the outer wheel slips and power is not transmitted to the inner wheel, the vehicle cannot perform the normal turning operation.

In order to solve this problem, the torque transmission unit 13 is located on the front and rear of the clutch pack 31, the clutch pack 31, which is installed on the drive shaft, and the clutch pack 31 is selectively connected during the turning operation of the vehicle. And the driving force transmitted from the clutch pack 31 by being connected to the first and second driving wheels 32 and 33 and the first and second driving wheels 32 and 33, respectively, to receive the driving force. First and second transmission parts 34 and 35 for transmitting to the right wheel (4).

The clutch pack 31 is selectively connected to the first and second driving wheels 32 and 33 according to the control signal of the controller 15, and the pressing force when the clutch pack 31 is connected to the first and second driving wheels 32 and 33. It is adjusted according to the control signal of the controller 15.

On the other hand, the torque transmission unit 13 may be applied to a variety of clutches, such as a multi-clutch clutch type 31 having a plurality of friction plates, a fluid clutch, a torque converter and an electronic clutch that can adjust the pressing force.

The first transmission part 34 includes a first gear 41 engaged with the first driving wheel 32, a second gear 43 and an axle installed on the first rotation shaft 42 of the first gear 41. A first side gear 44 is provided on the left side of 25 to be engaged with the second gear 43.

The second gear 43 and the first side gear 44 are each formed of a bevel gear so as to transmit the driving force in the vertical direction.

That is, the first side gear 44 transmits the torque transmitted through the clutch pack 31 to the left wheel 3, which is the outer wheel, in the right turning operation of the vehicle.

Similarly, the second transmission part 35 is the third gear 51 which is engaged with the second drive wheel 33, the fourth gear 53 which is installed on the second rotation shaft 52 of the third gear 51. And a second side gear 54 installed to engage with the fourth gear 53 at the right side of the axle 25.

The fourth gear 53 and the second side gear 54 are each formed of a bevel gear so as to transmit the driving force in the vertical direction.

That is, the second side gear 54 transmits the torque transmitted through the clutch pack 31 to the right wheel 3 which is the outer wheel in the left turning operation of the vehicle.

In FIG. 1 again, the detector 14 detects a steering wheel angle sensor and a steering wheel speed sensor for detecting a steering angle and a steering speed of the steering wheel, respectively, a vehicle speed sensor for detecting a current driving speed of the vehicle, and a rotation speed of each wheel. At least one of a wheel speed sensor, a yaw rate sensor for detecting the longitudinal, lateral acceleration of the vehicle and the accelerator pedal position sensor for detecting the position of the accelerator pedal.

The controller 15 determines whether to turn left or right according to the driving state information transmitted from the sensing unit 14, and the clutch pack 31 of the torque transmitting unit 13 moves the first driving wheel 32 during the turning operation. Alternatively, a control signal is generated to be connected to the second driving wheel 33.

Here, the driving state information includes the current driving speed, acceleration, steering angle, rotation speed and yaw rate information of the vehicle.

In addition, the controller 15 sets a preset range of the pressing force of the clutch pack 31 to adjust the degree of connection between the clutch pack 31 and the first or second driving wheels 32 and 33 according to the driving state information. Adjust in

For example, the controller 15 adjusts the pressing force of the clutch pack 31 to the maximum at the time of the acceleration of the turning oscillation to the outside of the torque close to 100% of the total driving force transmitted to the axle 25 through the drive shaft 21. Control to transmit to the wheel.

On the other hand, the controller 15 may control to increase the torque applied to the outer wheel at a high speed to about 5 to 20% of the driving force transmitted to the axle 25 through the drive shaft 21.

To this end, the controller 15 previously stores each pressurized value mapped according to the driving state information in an internal memory (not shown). When the driving state information is transmitted from the sensing unit 14, the controller 15 searches for the corresponding pressurized value and clutches the clutch. The pressing force of the pack 31 is controlled.

Accordingly, the present invention can increase the torque applied to the outer wheel using the torque transmission unit provided on the drive shaft during the turning operation of the vehicle.

And the present invention can adjust the torque applied to the outer ring by adjusting the pressing force of the clutch pack according to the driving state of the vehicle.

Accordingly, the present invention can improve the cornering performance by precisely adjusting the torque transmitted to the outer ring.

Next, the control method of the turning driving control system to which the torque vectoring device according to the preferred embodiment of the present invention is applied will be described in detail with reference to FIGS. 3 and 4.

3 is a flowchart illustrating a step-by-step control method of the turning driving control system to which the torque vectoring device is applied according to a preferred embodiment of the present invention, and FIG. 4 is a view for explaining the control method of the turning driving control system shown in FIG. This is an operation state diagram.

As shown in FIG. 3, when the ignition key (not shown) of the vehicle is operated to start driving of the vehicle, each sensor provided in the sensing unit 14 detects a current state of the driving vehicle (S10). .

That is, the detector 14 detects driving state information such as the current driving speed, acceleration, rotation speed of each wheel, steering angle, and yaw rate information of the vehicle.

Thereafter, the detector 14 continuously detects driving state information while the vehicle is driving and transmits the detected state information to the controller.

Then, the controller 15 checks whether the vehicle is turning by using the driving state information detected by the detector 14 (S11).

As a result of the inspection at step S11, when the vehicle accelerates to straight start, the controller 15 controls the clutch pack 31 installed at the drive shaft 21 to be kept spaced apart from the first and second drive wheels 32 and 33. do.

Accordingly, the differential unit 12 equally divides the driving force transmitted to the axle through the drive shaft 21 and transmits the same torque to each wheel 2 (S12).

On the other hand, as a result of the inspection in step S11, when the vehicle is turning, the control unit 15 connects the clutch pack 31 installed on the drive shaft 21 with the first or second driving wheels 32 and 33 according to the turning direction. Generate a control signal (S13).

For example, when the vehicle is turning in the right direction, the controller 15 connects the clutch pack 31 to the first driving wheel 32 in FIG. 2, and when the vehicle is turning in the left direction, the clutch pack ( 31 is controlled to connect with the second drive wheel (33).

That is, as shown in FIG. 4, the controller 15 controls to increase the torque applied to the wheel on the opposite side of the turning direction, that is, the outer wheel, in the turning direction (S14).

At this time, the controller 15 controls to increase the torque applied to the outer wheel by about 5 to 20% of the total driving force transmitted to the axle 25 through the drive shaft 21 according to the driving state information of the vehicle.

For example, if the total driving force is '100', the controller 15 connects the clutch pack 31 to the first or second driving wheels 32 and 33 to drive a part of the total driving force, for example, '20'. Is transmitted to the outer ring to increase the torque.

Then, the differential unit 12 equally divides the remaining driving force '80' and transmits driving force of '40' to the inner and outer wheels, respectively.

As a result, the inner wheel receives the driving force of '40' and the outer wheel receives the driving force of the '60', so that the vehicle can stably perform cornering during the turning operation.

In addition, the control unit 15 controls the torque applied to the outer wheel by adjusting the pressing force of the clutch pack 31 according to the driving speed of the current vehicle in the driving state information.

That is, the control unit 15 transmits the driving force close to 100% of the driving force transmitted to the axle 25 through the driving shaft 21 when the oscillation acceleration is accelerated in the stop state on the rain, snow, and ice to the outer wheel. ).

On the other hand, the control unit 15 controls the clutch pack 31 to transmit about 5 to 20% of the driving force to the outer wheel to improve the stability of cornering during high-speed turning.

As described above, the present invention can increase cornering performance by smoothly escaping corners by adjusting and increasing the torque applied to the outer wheel during the turning driving according to the driving state information.

In step S15, the controller 15 checks whether the driving is ended according to whether the ignition key is turned off, and controls to perform steps S10 to S15 repeatedly until the driving ends.

On the contrary, when the driving ends in step S15, the controller 15 controls to end the operation of the torque vectoring device 10.

Through the process as described above, the present invention by adjusting the torque applied to the outer wheel during the turning driving in accordance with the driving state information, it is possible to smooth corner escape can improve the cornering performance.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

That is, in the present embodiment, for convenience of description, the rear wheel driving type vehicle which drives the rear wheels using the power of the engine will be described, but the present invention is not necessarily limited thereto.

For example, the present invention can be modified to be applied to both front wheels and rear wheels of a four wheel drive vehicle.

The present invention is applied to the technical field to improve the cornering performance and stability by increasing the torque by transmitting a portion of the driving force transmitted from the engine and the transmission to the axle through the drive shaft to the outer wheel during the turning of the vehicle.

1: engine and transmission 2: wheel
3: left wheel 4: right wheel
10: turning drive control system 11: power transmission unit
12: differential part 13: torque transmission part
14: detection unit 15: control unit
21: drive shaft 22: longitudinal reduction gear
23: drive pinion 24: ring gear
25: Axle 31: Clutch Pack
32: first drive wheel 33: second drive wheel
34: first delivery unit 35: second delivery unit
41: first gear 42: first rotating shaft
43: second gear 44: first side gear
51: third gear 52: second rotating shaft
53: fourth gear 54: second side gear

Claims (8)

Power transmission unit for transmitting the driving force from the engine and the transmission to the wheel,
A differential unit for differentially transmitting the driving force transmitted from the power transmission unit to the left wheel and the right wheel,
Torque transmission unit for transmitting a portion of the driving force transmitted from the power transmission unit to the outer wheel when left or right turning,
Detection unit for detecting whether the vehicle is turning and driving status information
It includes a control unit for controlling the driving of the torque transmission unit to increase the torque applied to the outer wheel by determining whether or not to drive on the basis of the driving state information of the sensor,
The torque transmission unit is a clutch pack installed on the drive shaft,
First and second drive wheels selectively connected to the clutch pack during a turning operation of the vehicle to receive driving force;
And a first and second transmission parts connected to the first and second driving wheels, respectively, to transmit driving force transmitted from the clutch pack to the left wheel or the right wheel, wherein the torque vectoring device is applied. . delete The method of claim 1, wherein the first and second delivery unit, respectively
First and second gears engaged with the first and second drive wheels,
Third and fourth gears installed on the first and second rotation shafts of the first and second gears, and
A first and second side gears which are installed to be engaged with the third gear and the fourth gear on the left side and the right side of the axle to receive the driving force;
And the third gear, the first side gear, the fourth gear and the second side gear are bevel gears for transmitting the driving force in a vertical direction. According to claim 1 or 3, wherein the detection unit
At least two of a steering wheel angle sensor, a steering wheel speed sensor, a vehicle speed sensor, a wheel speed sensor, a yaw rate sensor, and an accelerator pedal position sensor. 5. The method of claim 4,
The driving state information includes the current driving speed, acceleration, steering angle, rotation speed and yaw rate information of each wheel,
The control unit controls the torque transmission unit to transmit a driving force close to all of the driving force transmitted to the axle to the outer wheel during the turning start acceleration of the vehicle,
And a torque vectoring device to control the torque transmission unit to transmit a driving force of 5 to 20% of the driving force transmitted to the axle to the outer wheel during the high-speed turning driving of the vehicle. (a) detecting driving state information of the vehicle when driving starts;
(b) checking whether the vehicle is turning by using the driving state information;
(c) increasing the torque by transmitting a portion of the driving force transmitted to the axle through the drive shaft to the outer wheel when the vehicle is driven in a turning direction, as a result of the inspection of step (b);
In the step (c), it is determined whether or not the vehicle oscillation acceleration is accelerated based on the driving state information, and when the vehicle oscillation acceleration is accelerated, the driving force close to all of the driving forces transmitted to the axle is transmitted to the outer wheel of the vehicle. A control method of a turning drive control system to which a torque vectoring device is applied. delete 7. The method of claim 6, wherein step (c)
Torque vectoring, characterized in that to check whether the vehicle is turning at a high speed on the basis of the driving state information, and to transmit a driving force of 5 to 20% of the driving force transmitted to the axle to the outer wheel of the vehicle at the time of the turning. Control method of turning drive control system to which the device is applied.

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