KR20170067572A - Automated 4WD system for working vehicle - Google Patents

Automated 4WD system for working vehicle Download PDF

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Publication number
KR20170067572A
KR20170067572A KR1020150174377A KR20150174377A KR20170067572A KR 20170067572 A KR20170067572 A KR 20170067572A KR 1020150174377 A KR1020150174377 A KR 1020150174377A KR 20150174377 A KR20150174377 A KR 20150174377A KR 20170067572 A KR20170067572 A KR 20170067572A
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KR
South Korea
Prior art keywords
wheel drive
vehicle
unit
measuring unit
measuring
Prior art date
Application number
KR1020150174377A
Other languages
Korean (ko)
Inventor
박진감
한중수
Original Assignee
엘에스엠트론 주식회사
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Publication date
Application filed by 엘에스엠트론 주식회사 filed Critical 엘에스엠트론 주식회사
Priority to KR1020150174377A priority Critical patent/KR20170067572A/en
Publication of KR20170067572A publication Critical patent/KR20170067572A/en

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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
    • 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
    • B60K17/348—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/30—Sensors
    • B60Y2400/303—Speed sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/82—Four wheel drive systems

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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)
  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)

Abstract

The present invention relates to an automatic four-wheel drive apparatus for a front-wheel drive vehicle and a rear-wheel drive vehicle, comprising: a tilt measuring unit for measuring a tilt of a vehicle relative to a horizontal; An axle speed measuring unit for measuring a front axle speed and a rear axle speed of the vehicle; A controller for receiving a signal from the inclination measuring unit and the axle speed measuring unit to determine whether the vehicle is a two-wheel drive vehicle or a four-wheel drive vehicle; And a power switching unit for operating two-wheel drive or four-wheel drive in accordance with a signal from the control unit, thereby contributing to an improvement in convenience and stability of vehicle operation.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic four-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a working vehicle such as a tractor, and relates to a four-wheel drive apparatus for a working vehicle capable of driving front wheels and rear wheels.

BACKGROUND ART [0002] Generally, a working vehicle such as a tractor, a combine, a weeding machine, or the like is a vehicle that carries out various operations by attaching or mounting a working machine, and generally includes a traveling system power for driving wheels required for traveling through a transmission, And a PTO (power take off) power for driving various types of working machines required for the operation.

A four-wheel drive system that can drive both the front and rear wheels is commonly used as a driving vehicle.

In the four-wheel drive system, the rotational power generated by the engine is transmitted to the transmission through the clutch, and the transmission shifts the power of the engine to match the running condition of the working vehicle and transmits the power to the front- and rear- The power transmitted to the front wheel propulsion shafts and the rear wheel propulsion shafts is transmitted to the front wheel differential device and the rear wheel differential device so as to drive the wheels.

The work vehicle employing the four-wheel drive system is configured to be able to switch from two-wheel drive to four-wheel drive manually as required.

However, in the case where the four-wheel drive is switched in a manual manner operated by the driver as described above, there is a problem that the driver must manually switch the vehicle at the point of time when four-wheel drive is required.

Such a manual four-wheel drive switching system may cause the vehicle to be pushed or overturned when the vehicle is traveling at a slope of more than a certain angle, if the transition to the four-wheel drive is late, or when the vehicle slips on a land surface such as a water sump. If the conversion is not fast, it is difficult to get out quickly, and there is also a problem that the stability of the driving greatly decreases.

The contents of the background art described above are technical information that the inventor of the present application holds for the derivation of the present invention or acquired in the derivation process of the present invention and is a known technology disclosed to the general public prior to the filing of the present invention I can not.

1. Patent document KR Patent No. 10-1143049 2. Patent Literature KR Registration No. 10-0291087

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a vehicle driving system capable of automatically switching four- The present invention provides an automatic four-wheel drive apparatus for a working vehicle.

An automatic four-wheel drive apparatus for a working vehicle according to the present invention for realizing the above-mentioned problems comprises: a tilt measuring unit for measuring a tilt of a vehicle with respect to a horizontal; An axle speed measuring unit for measuring a front axle speed and a rear axle speed of the vehicle; A controller for receiving a signal from the inclination measuring unit and the axle speed measuring unit to determine whether the vehicle is a two-wheel drive vehicle or a four-wheel drive vehicle; And a power switching unit for operating two-wheel drive or four-wheel drive according to a signal of the control unit.

And the control unit is configured to output the four-wheel drive switching signal to the power switching unit when the inclination of the vehicle inputted through the inclination measuring unit is greater than a predetermined value.

Preferably, the control unit is configured to output a two-wheel drive switching signal to the power switching unit when the inclination of the vehicle inputted through the inclination measuring unit is less than a predetermined value.

The axle speed measuring unit preferably includes a front axle speed sensor for measuring a rotational speed of the front axle and a rear axle speed sensor for measuring a rotational speed of the rear axle.

It is preferable that the inclination measuring unit is installed at an intermediate portion of the vehicle body.

And the control unit is configured to output the four-wheel drive switching signal to the power switching unit when the rotational speeds of the front axle and the rear axle inputted through the axle speed measuring unit differ by a predetermined amount or more.

Preferably, the control unit is configured to output a two-wheel drive switching signal to the power switching unit when the rotational speeds of the front axle and the rear axle inputted through the axle speed measuring unit differ by less than a predetermined value.

The above and other objects and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: In addition to the principal task solutions as described above, various task solutions according to the present invention will be further illustrated and described.

The automatic four-wheel drive device of the working vehicle according to the present invention detects the occurrence of slip on the wheels when the vehicle runs on a slope, and can automatically switch the four-wheel drive without operating the driver, There is an effect that improvement can be achieved.

That is, according to the present invention, it is possible to quickly switch from a slope to a four-wheel drive, thereby reducing the risk of pivoting or overturning, and in the event of a slip on a wheel in a terrain such as a puddle, The work can be performed more easily, and the risk can be reduced to contribute to the improvement of the stability.

1 is a schematic view showing a work vehicle having an automatic four-wheel drive device according to an embodiment of the present invention.
2 is a flowchart showing a control method of an automatic four-wheel drive apparatus for a working vehicle according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to Fig. 1, reference numeral 10 denotes a working vehicle such as a tractor. The working vehicle 10 is provided with an automatic four-wheel drive device.

The automatic four-wheel drive device includes a tilt measuring portion 20 for measuring a tilt of the vehicle with respect to the horizontal, axle speed measuring portions 31 and 35 for measuring the front axle speed and rear axle speed of the vehicle, And a power switching unit 50 for operating two-wheel drive or four-wheel drive in response to a signal from the control unit 40 .

The inclination measuring unit 20 is a mechanism for measuring the inclination of the vehicle body with respect to a horizontal plane when the vehicle is traveling or when the vehicle is stationary, and may be constituted by a tilt sensor for measuring the inclination. The inclination measuring unit 20 may be provided at any part of the vehicle body, but is preferably provided at an intermediate portion of the vehicle body as illustrated in Fig.

The axle speed measuring units 31 and 35 preferably include a front axle speed sensor 31 and a rear axle speed sensor 35 so as to measure the rotational speed of the front axle and the rotational speed of the rear axle, respectively.

The front axle speed sensor 31 and the rear axle speed sensor 35 can use a wheel speed sensor generally used in an ABS device.

The control unit 40 receives the rotor measurement signals from the inclination measuring unit 20, the front axle speed sensor 31 and the rear axle speed sensor 35, determines whether to switch the 2WD / 4WD drive, As a control mechanism, it may be configured in an ECU that electronically controls the vehicle, or may be configured in a TCS (traction control system) or the like.

The control unit 40 is configured to output the four-wheel drive switching signal to the power switching unit 50 when the inclination of the vehicle inputted through the inclination measuring unit 20 is equal to or greater than a predetermined value. Further, when the rotational speeds of the front axle and the rear axle inputted through the axle speed measuring units 31 and 35 differ from each other by a predetermined amount or more, the control unit 40 controls the power switching unit 50 to switch the four- .

The control unit 40 may be configured to output the two-wheel drive switching signal to the power switching unit 50 when the inclination of the vehicle inputted through the inclination measuring unit 20 is less than a predetermined value. Further, when the rotational speeds of the front axle and the rear axle inputted through the axle speed measuring units 31 and 35 differ from each other by a predetermined value or less, the control unit 40 controls the power switching unit 50 to switch the two- .

The power switching unit 50 is a component that can switch from two-wheel drive to four-wheel drive and four-wheel drive to two-wheel drive. The power switching unit 50 is usually provided on the transmission output shaft for shifting the rotational power of the engine, .

The power switching unit 50 uses a clutch mechanism that interrupts power transmission. The structure of the power switching unit 50 is disclosed in Korean Patent No. 10-0291087 and Japanese Patent No. 10-0391609, And a detailed description thereof will be omitted.

However, the power switching unit 50 may be provided with an actuator for automatically operating the power switching clutch mechanism in response to a signal from the control unit 40.

The four-wheel drive control method of the automatic four-wheel drive apparatus of the working vehicle according to the embodiment of the present invention will now be described with reference to FIG.

2 is a flowchart showing a control method of an automatic four-wheel drive apparatus for a working vehicle according to an embodiment of the present invention.

1 and 2, a control method using a four-wheel drive apparatus for a working vehicle according to an embodiment of the present invention includes a two-wheel drive work step in which only one of a front axle and a rear axle is driven, A four-wheel drive operation step of driving both the front axle and the rear axle when the inclination of the vehicle is equal to or more than a certain level during the running of the working stage or the rotational speeds of the front axle and the rear axle are more than a certain level .

During normal operation, operate with two-wheel drive. At this time, only front wheels are driven in the case of front wheel drive, and only rear wheels are driven in the case of rear wheel drive.

The forward and backward inclination of the working vehicle 10 is measured through the inclination measuring unit 20 during the two-wheel drive operation and the front and rear axle speed sensors 31 and 35 Measure the speed. The measurement signals measured by the inclination measuring unit 20, the front axle speed sensor 31 and the rear axle speed sensor 35 are input to the control unit 40. [

When the inclination of the vehicle is equal to or greater than a predetermined value, the control unit 40 determines the rotational speed of the rear axle and the rotational speed of the rear axle And outputs a control signal to the power switching section 50 to switch to four-wheel drive and travel.

In addition, even if the inclination of the vehicle is less than a certain level, if the slip occurs when the terrain such as the water pool runs, and only the rear axle rotates and the front axle does not rotate, The control section 40 that receives signals from the front axle speed sensor 31 and the rear axle speed sensor 35 outputs a control signal to the power switching section 50 to switch to four-wheel drive and travel.

Thereafter, when the working vehicle 10 travels from a slope to a flat ground and travels in a state in which the slope of the vehicle body is below a certain level, or when the difference between the rotational speeds of the front axle and the rear axle is equal to or less than a predetermined value, the inclination measuring unit 20 and the front axle speed sensor The control unit 40 outputs a control signal to the power switching unit 50 based on the information input from the rear wheel speed sensor 31 and the rear axle speed sensor 35 to switch from four-wheel drive to two-wheel drive again.

As described above, the technical ideas described in the embodiments of the present invention can be implemented independently of each other, and can be implemented in combination with each other. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. It is possible. Accordingly, the technical scope of the present invention should be determined by the appended claims.

10: Working vehicle
20:
31: Front axle speed sensor
35: rear axle speed sensor
40:
50: Power switching section

Claims (7)

A tilt measuring unit for measuring a tilt of the vehicle with respect to the horizontal;
An axle speed measuring unit for measuring a front axle speed and a rear axle speed of the vehicle;
A controller for receiving a signal from the inclination measuring unit and the axle speed measuring unit to determine whether the vehicle is a two-wheel drive vehicle or a four-wheel drive vehicle;
And a power switching section for operating two-wheel drive or four-wheel drive according to a signal from the control section. The method according to claim 1,
Wherein the control unit is configured to output a four-wheel drive switching signal to the power switching unit when the inclination of the vehicle inputted through the inclination measuring unit is equal to or greater than a predetermined value. The method according to claim 1,
Wherein the control unit is configured to output a two-wheel drive switching signal to the power switching unit when the inclination of the vehicle inputted through the inclination measuring unit is less than a predetermined value. The method according to claim 1,
Wherein the axle speed measuring unit comprises a front axle speed sensor for measuring a rotational speed of the front axle and a rear axle speed sensor for measuring a rotational speed of the rear axle. The method according to claim 1,
Wherein the inclination measuring unit is installed at an intermediate portion of the vehicle body. The method according to claim 1,
Wherein the control unit is configured to output a four-wheel drive switching signal to the power switching unit when a difference between a rotational speed of the front axle and a rear axle input through the axle speed measuring unit is greater than a predetermined value. Wheel drive. The method according to claim 1,
Wherein the control unit is configured to output a two-wheel drive switching signal to the power switching unit when a difference between the rotational speeds of the front axle and the rear axle inputted through the axle speed measuring unit is less than a predetermined value. Four wheel drive.
KR1020150174377A 2015-12-08 2015-12-08 Automated 4WD system for working vehicle KR20170067572A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150174377A KR20170067572A (en) 2015-12-08 2015-12-08 Automated 4WD system for working vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150174377A KR20170067572A (en) 2015-12-08 2015-12-08 Automated 4WD system for working vehicle

Publications (1)

Publication Number Publication Date
KR20170067572A true KR20170067572A (en) 2017-06-16

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Family Applications (1)

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KR1020150174377A KR20170067572A (en) 2015-12-08 2015-12-08 Automated 4WD system for working vehicle

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