KR101562471B1 - Control device of 4WD vehicle - Google Patents

Control device of 4WD vehicle Download PDF

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Publication number
KR101562471B1
KR101562471B1 KR1020140097324A KR20140097324A KR101562471B1 KR 101562471 B1 KR101562471 B1 KR 101562471B1 KR 1020140097324 A KR1020140097324 A KR 1020140097324A KR 20140097324 A KR20140097324 A KR 20140097324A KR 101562471 B1 KR101562471 B1 KR 101562471B1
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South Korea
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torque
vehicle
mode
determined
determination unit
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KR1020140097324A
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Korean (ko)
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강헌
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현대위아 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)

Abstract

The present invention relates to a control device of a four-wheel drive vehicle capable of improving fuel economy, minimizing power loss, and improving impact and noise.
For example, a control device for a four-wheel drive vehicle for judging a time when four-wheel drive is unnecessary in a vehicle running in four-wheel drive and releasing torque, comprising: determining whether or not the vehicle is in a stopped state A stop mode determining unit A torque release determination unit for determining whether or not two-wheel drive should be performed by releasing the torque according to the state of the vehicle and for issuing a torque release command; And a torque release mode determiner for determining a torque release mode of the vehicle in response to a command from the torque release determination unit.

Description

[0001] The present invention relates to a control device for a 4WD vehicle,

The present invention relates to a control apparatus for a four-wheel drive vehicle.

Generally, the four-wheel drive vehicle can be selectively operated in two operation modes (2WD and 4WD) depending on the driver's demand or the external driving situation. On the other hand, when changing to 2WD driving during 4WD driving, it is judged whether or not 2WD driving is canceled by simple comparison according to vehicle speed acceleration pedal value. Therefore, it is possible to consider a lot of driving situation in determination of reference acceleration pedal value And does not reflect the power transmission characteristics of the vehicle. Therefore, unnecessary four-wheel drive travel or two-wheel drive travel in a state in which four-wheel drive travel is favorable results in fuel consumption and power loss. In addition, since the method of releasing the vehicle from the stop state to the two-wheel drive running is not classified, the torsion of the drive system is suddenly released at the time of releasing the torque, so that the vehicle bottom impact and noise may be generated.

Korean Patent Publication No. 10-2013-0128170 (May 16, 2012)

The present invention provides a control device of a four-wheel drive vehicle that can improve fuel economy, minimize power loss, and improve shock and noise.

A control device for a four-wheel drive vehicle for determining a point in time when a vehicle traveling in four-wheel drive according to the present invention does not require four-wheel drive running and releasing torque, A stop mode determining unit for determining the stop mode; A torque release determination unit for determining whether or not two-wheel drive should be performed by releasing the torque according to the state of the vehicle and for issuing a torque release command; And a torque release mode determining unit that determines a torque release mode of the vehicle according to an instruction from the torque release determination unit.

In addition, the stop mode determination unit may determine whether the vehicle speed of the vehicle is '0', and if the vehicle speed of the vehicle is not '0', it may determine that the vehicle is not in a stationary state and output '0'.

When it is determined that the vehicle speed of the vehicle is '0', the stop mode determiner determines whether the gear of the transmission is in neutral or parking. If it is determined that the gear of the transmission is in neutral or parking, If it is determined that the time is longer than the reference time, if it is determined that the gear stage maintenance time is longer than the reference time, it is determined that the vehicle is maintained in the stopped state, and '1' is output.

If it is determined that the brake is on, if it is determined that the gear of the gear position is not in the neutral state or in the parking state, it is determined that the brake on state is greater than the reference time, If it is determined that the on-hold time is larger than the reference time, it is determined that the vehicle is maintained in a stationary state, and a '1' can be output.

Also, if it is determined that the brake is not on, the stop mode determination unit may determine that the vehicle is not in a stop state and output '0'.

The torque release determination unit determines whether or not there is an external event from the external module. If it is determined that there is no external event, the torque release determination unit checks whether or not the engine is stopped. If it is determined that the engine is stopped, It can be judged that driving should be performed.

The external module may be a module for detecting a situation requiring four-wheel drive such as turning state detection, slip occurrence detection, roughness detection and inclination detection.

If it is determined that the engine is not stopped, the torque release determination unit checks the stop state of the vehicle from the output of the stop mode determination unit. When it is determined that the output of the stop mode determination unit is '1' It can be judged that driving should be performed.

If it is determined that the output of the stop mode determination unit is '0', the torque release determination unit may sequentially calculate a load transfer amount, a load distribution ratio, a transmission output torque, a propeller shaft torque, a wheel slip torque, and an oscillation torque.

Also, the torque release determination unit may compare the propeller shaft torque with the propeller shaft reference torque, and if it is determined that the propeller shaft torque is smaller than the propeller shaft reference torque, the torque release determination unit may determine that the two- .

The torque release determination unit may compare the wheel slip torque and the oscillation torque, and if the oscillation torque is determined to be smaller than the wheel slip torque, it may be determined that the torque must be released to perform two-wheel drive travel.

When it is determined that the oscillation torque is larger than the wheel slip torque, the torque release determination unit compares the transmission output torque with the transmission reference torque, and if it is determined that the transmission output torque is smaller than the transmission reference torque, It can be judged that two-wheel drive should be performed.

Further, the torque release mode determining section classifies the release mode into a first mode, a second mode and a third mode according to the state of the vehicle, the first mode abruptly releases the torque more rapidly than the second mode, 2 mode can release torque more rapidly than the third mode.

If it is determined that the vehicle speed of the vehicle is '0', the torque release mode determination unit determines whether the current control torque is greater than the reference torque. If the control torque is greater than the reference torque It is determined whether the vehicle is a ramp or not, and if it is determined that the vehicle is a ramp, the release mode may be determined to be the third mode.

If it is determined that the absolute value of the steering angle is greater than the reference steering angle, the torque release mode determining unit may determine that the release mode is the third mode if it is determined that the absolute value of the steering angle is greater than the reference steering angle.

The torque release mode determining unit may determine the release mode to be the second mode when it is determined that the absolute value of the steering angle is smaller than the reference steering angle.

Further, the torque release mode determining unit may determine the release mode as the second mode if it is determined that the control torque is larger than the reference torque.

If it is determined that the vehicle is not an automatic transmission, the torque release mode determination unit determines whether the automatic transmission is currently shifting, if the vehicle is determined to be an automatic transmission, It is determined that the release mode is the second mode.

The torque release mode determining unit may determine that the target stage is smaller than the reference stage when it is determined that the automatic transmission is currently shifting, and may determine the release mode as the first mode if the target stage is determined to be smaller than the reference stage.

Also, the torque release mode determining unit may determine the release mode to be the second mode if it is determined that the target stage is larger than the reference stage.

The control apparatus for a four-wheel drive vehicle according to an embodiment of the present invention determines the point of time when four-wheel drive is unnecessary, releases the torque, and travels in a two-wheel drive manner, thereby achieving efficient four-wheel drive, Can be minimized.

In addition, the controller of the four-wheel drive vehicle according to the embodiment of the present invention can reduce the noise and impact by applying the torque slope differently according to the current state of the vehicle when the torque is released.

1 is a block diagram showing a control apparatus of a four-wheel drive vehicle according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a method of determining a stop mode of a vehicle according to the stop mode determination unit shown in FIG.
3 is a flowchart showing a method for determining whether the torque release determination unit shown in Fig. 1 is to release the torque of the vehicle.
4 is a flowchart showing a method of determining a torque release mode by the torque release mode determination portion shown in FIG.
5 is a graph showing the torque release mode.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

1 is a block diagram showing a control apparatus of a four-wheel drive vehicle according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating a method of determining a stop mode of a vehicle according to the stop mode determination unit shown in FIG. 3 is a flowchart showing a method for determining whether the torque release determination unit shown in Fig. 1 is to release the torque of the vehicle. 4 is a flowchart showing a method of determining a torque release mode by the torque release mode determination portion shown in FIG. 5 is a graph showing the torque release mode.

1, a controller 100 of a four-wheel drive vehicle according to an embodiment of the present invention includes a stop mode determination unit 110, a torque release determination unit 120, and a torque release mode determination unit 130 . The vehicle described below refers to a four-wheel drive vehicle, and it is assumed that the vehicle is currently in a four-wheel drive state.

The stop mode determination unit 110 determines whether the vehicle is currently in a stop state. The stop mode determination unit 110 determines the stop mode of the vehicle by combining the information of the vehicle speed, the speed change stage, and the brake signal. Here, the stop mode determination unit 110 outputs '1' when it is determined that the vehicle is stationary, and outputs '0' when it is determined that the vehicle is not stationary. The stop mode determination unit 110 transmits the stop state of the vehicle to the torque release determination unit 120.

Referring to FIG. 2, a method of determining the stop mode of the vehicle by the stop mode determiner 110 will be described.

The stop mode determination unit 110 determines whether the vehicle speed of the vehicle is '0' (S1). If the vehicle speed of the vehicle is not '0', the stop mode determination unit 110 determines that the vehicle is not stopped and outputs '0' (stop mode = 0) (S2).

If it is determined that the vehicle speed of the vehicle is '0', the stop mode determination unit 110 determines whether the gear of the speed change stage is in neutral (N) or parking (P) (S3). If it is determined that the gear of the gear position is in neutral (N) or parking (P), the stop mode determination unit 110 determines whether the gear position hold time is greater than the reference time (S4) , It is determined that the vehicle is maintained in the stopped state, and '1' is output (stop mode = 1) (S5).

If it is determined that the gear of the speed change stage is not in neutral (N) or parking (P), the stop mode determination unit 110 determines whether the brake is on (S6). If it is determined that the brake ON state holding time is greater than the reference time (S7), if it is determined that the brake ON state holding time is greater than the reference time, the stop mode determining unit 110 determines that the vehicle is in the stop state And outputs '1' (stop mode = 1) (S5).

If it is determined that the brake is not turned on, the stop mode determination unit 110 determines that the vehicle is not stopped and outputs '0' (stop mode = 0) (S2).

The torque release determination unit 120 determines whether or not to release the torque according to the state of the vehicle to perform two-wheel drive driving. The torque release determination unit 120 determines whether or not the torque of the vehicle is released by combining information such as the engine state, the engine torque, the engine maximum torque, the speed change stage, the speed ratio, and the closing speed. In addition, the torque release determination unit 120 may determine whether an external event is present from the external module 10. [ Here, the external module 10 is a module capable of detecting various situations requiring four-wheel drive such as turning state detection, slip occurrence detection, rough road detection, inclination detection, and the like, and the external event refers to a situation requiring four-wheel drive . The torque release determination unit 120 issues a torque release command to the torque release mode determination unit 130 when the torque release determination unit 120 determines that the vehicle is to be released from the torque and must drive two-wheel drive.

Referring to FIG. 3, a method of determining the torque release of the vehicle by the torque release determination unit 120 will be described below.

The torque release determination unit 120 determines whether there is an external event from the external module 10 (S11). If it is determined that there is no external event, the torque release determination unit 120 determines whether or not the engine is stopped (S12). If it is determined that the engine is stopped, the torque release determination unit 120 determines that the torque should be canceled to perform two- (S23).

If it is determined that the engine is not stopped, the torque release determination unit 120 checks the output of the stop mode determination unit 110 to check whether the vehicle is stopped (S13). If it is determined that the output of the stop mode determination unit 110 is '1', the torque release determination unit 120 determines that the torque should be released to perform two-wheel drive (S23).

When it is determined that the output of the stop mode determiner 110 is '0', the torque release determiner 120 sequentially outputs a load shift amount, a load distribution ratio, a transmission output, a propeller shaft torque, a wheel slip torque, .

First, the torque release determination unit 120 calculates a load transfer amount (S14), and the load transfer amount is expressed by Equation (1).

[Equation 1]

Load transfer amount = (closing speed x weight center height x vehicle load) / (gravity acceleration x axis distance)

The torque release determination unit 120 calculates a load distribution ratio (S15), and the load distribution ratio is expressed by the following equation (2).

&Quot; (2) "

Front wheel load distribution ratio = front axle load / vehicle load

Rear wheel load distribution ratio = rear wheel axle load / vehicle load

Here, the front axle load and the rear axle load are as follows.

Front wheel axle load = Front wheel axle load - Load transfer amount

Rear wheel axle load = rear wheel basic axle load + load transfer amount

The front wheel base axle load and the rear wheel base axle load refer to loads applied to the front wheel axle and the lower wheel axle when the vehicle is stopped in a flat state. The load distribution ratio between the front wheel and the rear wheel is a value between 0 and 1, and the sum of the two values is calculated to be 1.

The torque release determination unit 120 calculates a transmission output torque (S16), and the transmission output torque is expressed by the following equation (3).

&Quot; (3) "

Transmission Output Torque = Engine Output Torque x Current Transmission Gear Ratio x Transmission Transmission Efficiency

Here, the engine output torque is a value measured by the engine controller, and the present transmission gear ratio means a gear ratio corresponding to the gear stage output from the transmission controller. Since there is no separate transmission controller in a manual transmission vehicle, the present transmission gear ratio can be estimated through correlation between engine speed and vehicle speed. Also, the transmission transmission efficiency has a value between 0 and 1 as a maximum transmission efficiency value for each shift stage.

The torque release determination unit 120 calculates a propeller shaft torque (S17), and the propeller shaft torque is expressed by Equation (4).

&Quot; (4) "

Propeller shaft torque = transmission output torque xPTU gear ratio xPTU transmission efficiency

Here, the PTU (Power Transfer Unit) is a power transmission device, the PTU gear ratio is a vehicle specification, and the PTU transmission efficiency can be replaced with a transmission efficiency table according to the transmission torque and the rotation speed.

The torque release determination unit 120 calculates a wheel slip torque (S18), and the wheel slip torque is expressed by Equation (5).

&Quot; (5) "

Wheel slip torque = Front axle load x Surface friction coefficient x Tire radius

Here, the wheel slip torque means the maximum torque amount that the front tire can transmit without slip, and the road surface friction coefficient is calculated by calculating the estimated value according to the running state of the vehicle in real time or inputting a fixed value, Value.

The torque release determination unit 120 calculates an oscillation torque (S19), and the oscillation torque is expressed by Equation (6).

&Quot; (6) "

Oscillation Torque = Engine Maximum Torque x Acceleration Gear Ratio x Transmission Transmission Efficiency

The torque release determination unit 120 compares the propeller shaft torque calculated above with the propeller shaft reference torque (S20). When it is determined that the propeller shaft torque is smaller than the propeller shaft reference torque, the torque is released and the two- (S23).

The torque release determination unit 120 compares the wheel slip torque with the oscillation torque (S21). If it is determined that the oscillation torque is smaller than the wheel slip torque, the torque release determination unit 120 determines that the torque must be released to perform two-wheel drive travel S23).

Meanwhile, if it is determined that the oscillation torque is larger than the wheel slip torque, the torque release determination unit 120 compares the transmission output torque with the transmission reference torque (S22). When it is determined that the transmission output torque is smaller than the transmission reference torque, the torque release determination unit 120 decides that the torque should be released to perform two-wheel drive running (S23).

The torque release mode determination unit 130 releases the torque of the vehicle according to the command of the torque release determination unit 120. [ At this time, the torque release mode determining unit 130 determines a torque release mode according to information such as vehicle speed, transmission information, steering angle, tilt information, control torque, and the like. Here, the mode in which the torque release mode deciding portion 130 releases the vehicle torque includes the first mode, the second mode and the third mode, and the torque is released gradually from the first mode to the third mode do. Further, the clutch control unit 20 for directly controlling the clutch according to the torque release mode determination unit 130 and releasing the torque may be further connected.

Referring to FIG. 4, a method for determining the torque release mode by the torque release mode determination unit 130 will be described below.

The torque release mode determination unit 130 determines whether the vehicle speed of the vehicle is '0' (S31). If it is determined that the vehicle speed of the vehicle is '0', the torque release mode determination unit 130 determines whether the current control torque is greater than a reference torque (S32).

If the control torque is less than the reference torque, the torque release mode determination unit 130 determines whether the vehicle is in a slope or not (S33). If the control torque is determined to be a slope, the release mode is determined to be the third mode (S34). If it is determined that the absolute value of the steering angle is greater than the reference steering angle (S35), the torque release mode determination unit 130 determines that the release mode is the third mode if the absolute value of the steering angle is greater than the reference steering angle (S34). If the absolute value of the steering angle is smaller than the reference steering angle, the torque release mode determination unit 130 determines the release mode to be the second mode (S36).

If the control torque is greater than the reference torque, the torque release mode determination unit 130 determines the torque release mode to be the second mode (S36).

If it is determined that the vehicle speed of the vehicle is not '0', the torque release mode determination unit 130 determines whether the vehicle is an automatic transmission or a manual transmission (S37). If it is determined that the vehicle is a manual transmission, (S38). If it is determined that the automatic transmission is not shifting, the torque release mode determining unit 130 determines the release mode to be the second mode (S36). If it is determined that the automatic transmission is shifting, the torque release mode determination unit 130 determines whether the target stage is smaller than the reference stage (S39). If the target stage is less than the reference stage, the release mode is determined to be the first mode (S40). In addition, if the target end is larger than the reference end, the torque release mode determination unit 130 determines the release mode as the second mode (S36). Here, the reference level may be three in the lower stage, but the present invention is not limited thereto.

If the vehicle is not an automatic transmission, the torque release mode determiner 130 estimates the speed change stage (S41) and determines whether the clutch is in the on state (S42). If it is determined that the clutch is not in the ON state, the torque release mode determination unit 130 determines the release mode to be the second mode (S36). If it is determined that the clutch is in the ON state, the torque release mode determination unit 130 estimates the target shift stage (S43). Here, since the manual transmission can not receive information on the target stage, the target gear stage is estimated using the engine speed. The torque release mode determination unit 130 determines whether the target end is smaller than the reference end (S39). If the target end is less than the reference end, the release mode is determined to be the first mode (S40). In addition, if the target end is larger than the reference end, the torque release mode determination unit 130 determines the release mode as the second mode (S36).

Referring to FIG. 5, a graph for each mode determined by the torque release mode determining unit 130 is shown. That is, as shown in FIG. 6, it can be seen that the first mode is very sharp when the torque is released when the tilt is almost vertical. It can be seen that the second mode has a smaller slope than the first mode and the third mode has a smaller slope than the second mode. That is, dividing the torque release mode into the first mode, the second mode and the third mode is to decide whether to release the torque suddenly or gradually when the torque is released. The reason for dividing the torque release mode is that if the torque is suddenly released when the vehicle is stopped on a ramp or the steering angle is higher than a certain level, the torque transmission parts such as the propeller shaft and the PTU are rapidly restored, It is because.

As described above, the control apparatus for a four-wheel drive vehicle according to an embodiment of the present invention determines the point in time when four-wheel drive is unnecessary, releases the torque, and travels in a two-wheel drive manner. Thus, efficient four- And the power loss can be minimized.

Further, the controller of the four-wheel drive vehicle according to an embodiment of the present invention can reduce the noise and impact by applying the torque slope differently according to the current state of the vehicle when the torque is released.

As described above, the present invention is not limited to the above-described embodiment, but may be applied to other types of vehicles such as a motorcycle, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100: Control device of 4WD vehicle
110: stop mode determination unit
120: Torque release determination unit
130: Torque release mode determining section

Claims (20)

A control device for a four-wheel drive vehicle for determining a point in time when a four-wheel drive running is unnecessary in a vehicle running in four-wheel drive, and releasing the torque,
A stop mode determining unit for determining whether the vehicle is in a stop state;
A torque release determination unit for determining whether or not two-wheel drive should be performed by releasing the torque according to the state of the vehicle and for issuing a torque release command; And
And a torque release mode determiner for determining a torque release mode of the vehicle according to an instruction from the torque release determination unit,
The torque release mode determining section classifies the release mode into the first mode, the second mode and the third mode according to the state of the vehicle,
Wherein the first mode abruptly releases torque from the second mode, and the second mode abruptly releases torque from the third mode. The method according to claim 1,
The stop mode determination unit determines whether the vehicle speed of the vehicle is '0', and determines that the vehicle is not in a stop state if the vehicle speed of the vehicle is not '0', and outputs '0' A control device of a wheel drive vehicle. 3. The method of claim 2,
When it is determined that the vehicle speed of the vehicle is '0', the stop mode determination unit determines whether the gear of the transmission is in neutral or parking. If it is determined that the gear of the transmission is in neutral or parking, And outputs a value of " 1 " when it is determined that the vehicle is in a stopped state if it is determined that the gear stage hold time is greater than the reference time. The method of claim 3,
If it is determined that the brake is on, if it is determined that the gear of the gear position is not in the neutral state or the parking state, the stop mode determination unit determines whether the brake on state is greater than the reference time, And outputs a value of " 1 " if it is determined that the time is longer than the reference time. 5. The method of claim 4,
Wherein the stop mode determination unit determines that the vehicle is not in a stopped state and outputs '0' if it is determined that the brake is not in the on state. The method according to claim 1,
The torque release determination unit checks whether or not there is an external event from the external module. If it is determined that there is no external event, the torque release determination unit checks whether or not the engine is stopped. If it is determined that the engine is stopped, The control unit determines that the vehicle should be driven by the vehicle. The method according to claim 6,
Wherein the external module is a module for detecting a situation requiring four-wheel drive such as turning state detection, slip occurrence detection, rough road detection and inclination detection. The method according to claim 6,
The torque release determination unit determines the stop state of the vehicle from the output of the stop mode determination unit if it is determined that the engine is not stopped, and releases the torque when the output of the stop mode determination unit is '1' The control unit determines that the vehicle should be driven by the vehicle. 9. The method of claim 8,
Wherein the torque release determination unit sequentially calculates a load transfer amount, a load distribution ratio, a transmission output torque, a propeller shaft torque, a wheel slip torque, and an oscillation torque when it is determined that the output of the stop mode determination unit is '0' A control device for a drive vehicle. 10. The method of claim 9,
Wherein the torque release determination unit compares the propeller shaft torque with a propeller shaft reference torque and determines that the propeller shaft torque is less than the propeller shaft reference torque to determine that the torque should be released to perform two- 4-wheel drive vehicle control device. 10. The method of claim 9,
Wherein the torque release determination unit compares the wheel slip torque and the oscillation torque to determine that the two wheels should be driven by releasing the torque when the oscillation torque is determined to be smaller than the wheel slip torque. A control device for a drive vehicle. 12. The method of claim 11,
Wherein the torque release determination unit compares the transmission output torque with the transmission reference torque when it is determined that the oscillation torque is larger than the wheel slip torque, and when the transmission output torque is determined to be smaller than the transmission reference torque, The control unit determines that the vehicle should be driven in a driving manner. delete The method according to claim 1,
The torque release mode determination unit determines whether the vehicle speed of the vehicle is '0' or not. If it is determined that the vehicle speed of the vehicle is '0', it is checked whether the current control torque is greater than the reference torque. And determines whether the vehicle is a ramp or not by determining whether the ramp is a ramp or not, and determines that the release mode is the third mode. 15. The method of claim 14,
Wherein if the absolute value of the steering angle is larger than the reference steering angle and the absolute value of the steering angle is greater than the reference steering angle, then the release mode is determined to be the third mode A control device of a wheel drive vehicle. 16. The method of claim 15,
Wherein the torque release mode determining unit determines the release mode to be the second mode when it is determined that the absolute value of the steering angle is smaller than the reference steering angle. 15. The method of claim 14,
Wherein the torque release mode determining unit determines the release mode as the second mode when it is determined that the control torque is larger than the reference torque. 15. The method of claim 14,
If it is determined that the vehicle is not an automatic transmission, the torque release mode determination unit determines whether the automatic transmission is currently being shifted or not. If it is determined that the vehicle is in the automatic transmission, And determines that the release mode is the second mode if it is determined that the release mode is not the second mode. 19. The method of claim 18,
Wherein the torque release mode determining unit determines whether the target stage is smaller than the reference stage when it is determined that the automatic transmission is currently shifting and determines that the release mode is the first mode when the target stage is determined to be smaller than the reference stage 4-wheel drive vehicle control device. 20. The method of claim 19,
Wherein the torque release mode determining unit determines the release mode as the second mode when it is determined that the target stage is larger than the reference stage.
KR1020140097324A 2014-07-30 2014-07-30 Control device of 4WD vehicle KR101562471B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102346830B1 (en) * 2020-10-16 2022-01-04 현대위아(주) Vehicle driving mode control system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007137307A (en) * 2005-11-21 2007-06-07 Nissan Motor Co Ltd Traction control device for four-wheel drive vehicle and traction control method for four-wheel drive vehicle
KR101423428B1 (en) 2013-07-10 2014-07-24 현대다이모스(주) Apparatus for transferred the running mode of the 4-Wheel-Drive vehicles and Method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007137307A (en) * 2005-11-21 2007-06-07 Nissan Motor Co Ltd Traction control device for four-wheel drive vehicle and traction control method for four-wheel drive vehicle
KR101423428B1 (en) 2013-07-10 2014-07-24 현대다이모스(주) Apparatus for transferred the running mode of the 4-Wheel-Drive vehicles and Method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102346830B1 (en) * 2020-10-16 2022-01-04 현대위아(주) Vehicle driving mode control system

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