KR101935635B1 - Method and system for controlling a torque on stop of hill - Google Patents

Abstract

The present invention relates to a rear wheel drive-based four-wheel drive vehicle in which, even when a vehicle is stopped during a back plate or a steel plate of a hill or a ramp other than a flat running condition, Wheel drive vehicle in which the residual torque immediately before the stop of the vehicle is released to prevent a side effect caused by the residual torque at the time of stopping the actual vehicle is disclosed.
The disclosed ramp stopping torque control system includes a slope detection unit for detecting that the vehicle has entered a ramp; A stop detection unit for detecting a stop state of the vehicle; A vehicle speed detector for detecting a vehicle speed when the vehicle is running; A four-wheel switch for inputting an execution command for four-wheel drive of the vehicle; A four-wheel drive unit for executing four-wheel drive of the vehicle according to an execution command; And a control unit for controlling the vehicle to enter the ramp to release the residual torque before the vehicle is stopped or at the time of the steel plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a torque control system,

More particularly, the present invention relates to a system and a method for controlling a ramp of a ramp, and more particularly, to a ramp-type four-wheel drive vehicle, In order to prevent the traction of the vehicle from affecting the traction performance of the vehicle during re-acceleration according to the driving torque, a 4-wheel drive vehicle And more particularly, to a system and a method for controlling a ramp stopping torque.

Generally, a four-wheeled eco-friendly vehicle is, for example, a combination of an engine and a motor on the front wheels and a separate motor on the rear wheels, and performs basic drive control by driving either a front wheel or a rear wheel And when the driving force becomes insufficient, the partial 4WD (Parttime 4WD) drive control using the other one axis (motor) is executed.

Therefore, the creep control of the 4WD eco-friendly automobile is also performed by the 2WD drive control which drives only one of the front wheel and the rear wheel, so that the driving force necessary for the ramp is required to output the entire driving force to either the front wheel or the rear wheel. There is a fundamental problem in that a torque shortage occurs and an excessive torque is generated on the other side.

In addition, when the vehicle is parked along a hill or a ramp, or when the vehicle is stopped, there is a problem that the 4WD torque greatly affects the traction performance of the vehicle when the vehicle is restarted. That is, if 4WD torque continues to be applied under hill or ramp recognition and stop conditions, there will be a problem that the car NVH (Noise / Vibration / Harshness) problem and the driving system have side effects.

Korean Registered Patent No. 1339231 (registered on Dec. 3, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a four-wheel drive vehicle in which, in a rear wheel drive-based 4WD vehicle, even when a vehicle is stopped at a hill or a ramp, In order to prevent the influence of the traction performance of the vehicle during the re-acceleration, it is necessary to release the residual torque immediately before the stop of the vehicle so as to prevent a side effect due to the residual torque during the stop of the actual vehicle. System and method.

According to an aspect of the present invention, there is provided a ramp stopping torque control system including: a slope detecting unit for detecting that a vehicle enters a ramp; A stop detection unit for detecting a stop state of the vehicle; A vehicle speed detector for detecting a vehicle speed when the vehicle is running; A four-wheel switch for inputting an execution command for four-wheel drive of the vehicle; A four-wheel drive unit for executing four-wheel drive of the vehicle according to an execution command; And a control unit for controlling the vehicle to enter the ramp to release the residual torque before the vehicle is stopped or at the time of the steel plate.

The stop sensing unit may sense a shift state of the transmission for decelerating the vehicle speed due to the running of the vehicle and a load state of the brake pedal for stopping the rotational force of the front wheel or the rear wheel of the vehicle.

The inclination sensing unit may include a gyro sensor that measures a change in the azimuth of the vehicle by using a property that maintains the constant direction set at the beginning.

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The stop sensing unit may sense the stopping state of the vehicle according to the vehicle speed detected through the vehicle speed detecting unit or according to the input of the brake operation signal according to the operation of the brake pedal or the pressure signal of the brake cylinder have.

According to another aspect of the present invention, there is provided a ramp stopping torque control method including: (a) detecting that a slope sensing unit has entered a ramp; (b) a vehicle speed detecting unit detecting a vehicle speed along the running of the vehicle in the ramp; (c) detecting a stop state of the vehicle in the ramp by the stop detection unit; (d) releasing the remaining torque by releasing the four-wheel drive when the control unit is in the stopped state; (e) controlling a torque output for ensuring traction performance when the control unit completely stops the vehicle at the ramp; (f) determining whether the control unit is able to reattach the driver of the vehicle; And (g) controlling the torque output of the four-wheel drive according to the degree of inclination when the control unit has a willingness to re-engage the driver.

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In addition, in the step (c), the stop detection unit may detect the stop of the vehicle according to the vehicle speed detected through the vehicle speed detection unit, the input of the brake operation signal according to the operation of the brake pedal, It can detect the stop state.

In the step (f), the control unit may differentiate the vehicle speed detected through the vehicle speed detecting unit, or may detect an input of the accelerator pedal through the stop sensing unit, thereby determining the driver's willingness to reattach.

Other aspects, advantages and features of the present invention will become more apparent on the basis of the following description in the entire specification, including the following sections: Brief Description of the Drawings, Detailed Description, and Claims.

According to the present invention, it is possible to prevent the vehicle from affecting the traction performance of the vehicle at the time of re-acceleration according to the four-wheel drive torque even when the vehicle is stopped at the back of a hill or a ramp or during a steel plate.

In addition, the vehicle can release the residual torque immediately before stopping the hill or the ramp and stopping the steel plate, thereby preventing a side effect due to the residual torque when the vehicle is actually stopped.

In addition, by releasing the torque just before stopping the vehicle on the back plate or the steel plate running, it is possible to prevent noise, vibration, harshness, and side effects on the driveline, It can contribute to improvement.

In addition, since the torque is released when the vehicle comes to a standstill during stopping of the vehicle, there is no output torque to the transmission at the time of the actual stoppage, and there is no vehicle body vibration, and the four- .

1 is a view showing a basic concept for explaining the operation of a ramp stopping torque control system according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating an operation of a ramp-stopping torque control method according to an embodiment of the present invention. Referring to FIG.
3 is a view showing an example of releasing the clutch and releasing the 4WD torque when the vehicle is stopped according to the embodiment of the present invention.
4 is a view showing an example in which the 4WD torque is maintained even after the vehicle is completely stopped.
5 is a view showing an example of releasing the clutch immediately before stopping the vehicle in the back plate of the vehicle according to the embodiment of the present invention to release the torque and controlling the torque output by applying the clutch again after stopping.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain portions that are described as being "below" other portions are described as being "above " other portions. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, 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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The ramp stopping torque control system according to the present invention recognizes that the vehicle enters a hill or a ramp through a hill recognition unit such as an acceleration / deceleration sensor, detects a vehicle speed or a brake operation, The control unit releases the residual torque immediately before stopping the vehicle, and after the 4WD clutch is completely stopped, when the accelerator pedal is depressed to drive the vehicle again, the control unit controls the inclination of the road according to the inclination of the road The 4WD torque is output to control the vehicle to run in four-wheel drive.

1 is a view showing a basic concept for explaining the operation of a ramp stopping torque control system according to an embodiment of the present invention.

1, a ramp stopping torque control system 100 according to the present invention includes an inclination sensing unit 110, a stop sensing unit 120, a vehicle speed detecting unit 130, a four-wheel switch 140, a controller 150 And a four-wheel drive unit 160. The four-

The inclination detecting unit 110 detects that the vehicle has entered the ramp. For example, the inclination sensing unit 110 may be a gyro sensor or the like that measures a change in the azimuth of the vehicle based on a property that the constant direction set at the beginning is always used.

In addition, the inclination detecting unit 110 can detect the back plate of the vehicle, the steel plate state, or the entry of the vehicle into the ramp using an acceleration / deceleration sensor.

The stop detection unit 120 detects a stop state of the vehicle. For example, the stop detection unit 120 detects the shift state of the transmission for decelerating the vehicle speed caused by the running of the vehicle and the load (input) state of the brake pedal for stopping the rotational force of the front and rear wheels of the vehicle . The stop detection unit 120 detects the stop state of the vehicle according to the vehicle speed detected through the vehicle speed detection unit or upon input of the brake operation signal according to the operation of the brake pedal or in accordance with the pressure signal of the brake cylinder .

The vehicle speed detector 130 detects the vehicle speed of the vehicle. For example, the vehicle speed detector 130 may be, for example, a tachometer that detects the speed of the vehicle through a rotational speed of a wheel that rotates as the driver depresses the accelerator pedal.

The four-wheel switch 140 inputs an execution command for four-wheel drive of the vehicle. That is, when the driver turns on the four-wheel switch 140, the four-wheel drive state is established. When the four-wheel switch 140 is turned off, the two-wheel drive state is established.

The control unit 150 controls to release the residual torque before the vehicle enters the ramp and executes the stop at the back plate or the steel plate.

The four-wheel drive unit 160 executes the four-wheel drive of the vehicle according to the execution command of the control unit 150 in response to the ON signal input of the four-wheel switch 140. [

FIG. 2 is a flowchart illustrating an operation of a ramp-stopping torque control method according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 2, the ramp stopping torque control system 100 according to the present invention determines whether the vehicle is traveling on a flat ground through an acceleration sensor at step S210.

When the vehicle is judged to be running on the flat ground (S220-YES), the control unit 150 controls the existing four-wheel drive unit 4WD (S230) (S240).

At this time, the control unit 150 can determine whether the vehicle is stopped based on the vehicle speed detected through the vehicle speed detector 130, the brake operation signal detected through the stop detection unit 120, and the brake cylinder pressure signal.

Next, if it is determined that the vehicle is stopped (S240-YES), the control unit 150 cancels the four-wheel drive (4WD) to release the residual torque as shown in FIG. 3 (S250).

3, when the controller 150 determines that the vehicle is stopped because the steering angle is maintained at a constant angle and the brake pedal signal is input and the vehicle speed is reduced in the back plate recognition state of the ramp 33% as shown in FIG. 3, The clutch is released to release the 4WD control torque. 3 is a view showing an example of releasing the clutch and releasing the 4WD torque when the vehicle is stopped according to the embodiment of the present invention.

At this time, even after the vehicle is stopped and the vehicle is stopped due to the brake pedal signal being input and the vehicle speed being reduced, the steering angle remains unchanged at the steep angle recognition state of the ramp at 33%, and the vehicle is stopped, When the drive torque is maintained, body vibration may occur. 4 is a view showing an example in which the 4WD torque is maintained even after the vehicle is completely stopped.

Then, the controller 150 detects the vehicle speed through the vehicle speed detector 130 or detects the brake operation signal detected through the stop sensor 120. If it is determined that the vehicle has completely stopped (S260-YES) And controls the torque output for securing the traction performance as shown in FIG. 5 (S270).

Here, the traction performance includes a slipper control function for preventing the drive wheels from slipping on roads where the vehicle is likely to slip, such as snowy roads, and a slipper control function for preventing the slippery road from slipping due to the acceleration response of the accelerator And a trace control function for preventing the detachment of the battery. 5 is a view showing an example of releasing the clutch immediately before stopping the vehicle in the back plate of the vehicle according to the embodiment of the present invention to release the torque and controlling the torque output by applying the clutch again after stopping. That is, the control unit 150 cancels the remaining torque by releasing the 4WD drive (4WD) during the stop of the vehicle (S240) when the vehicle runs on the ramp (S250) And outputs a torque for ensuring traction performance by walking (S270).

Next, the controller 150 determines whether the driver is willing to reattach (S280).

That is, the control unit 150 can discriminate the vehicle speed detected through the vehicle speed detector 130 or detect the input of the accelerator pedal, thereby determining the driver's willingness to restart.

Next, when the driver is willing to reattach (S280-YES), the control unit 150 controls the torque output of the 4WD driving 4WD according to the inclination (S290).

On the other hand, even if the vehicle is not in a state of being in a stopped state during running of a ramp such as a back plate or a steel plate other than a flat surface (S240-NO), the control unit 150 controls the torque output of the 4WD driving 4WD according to the inclination ).

In addition, even when the vehicle is detected as being not completely stopped by detecting the vehicle speed through the vehicle speed detector 130 in a state where the vehicle is released from the 4WD drive (4WD) during the stopping of the vehicle in the inclined road (S250) (NO in S260), the control unit 150 determines whether the driver is ready to reattempt (S280).

That is, the control unit 150 can discriminate the vehicle speed detected through the vehicle speed detector 130 or detect the input of the accelerator pedal, thereby determining the driver's willingness to restart.

On the other hand, when the vehicle is released from the inclined road by releasing the 4WD drive (4WD) (S250), the residual torque is released, the vehicle is completely stopped (S260-YES), and the torque for securing the traction performance is outputted S270). When it is detected that the driver does not want to reattach the vehicle (S280: No), the controller 150 keeps controlling the torque output for securing the traction performance (S270).

Therefore, when the vehicle stops on a hill or a ramp, the residual torque is canceled so that the four-wheel drive can be prevented from affecting the traction performance of the vehicle at the time of re-acceleration.

As described above, according to the present invention, in the rear-wheel-drive-based four-wheel drive vehicle, even when the vehicle is stopped at the time of the back plate of the hill or the ramp, The present invention provides a system and method for controlling a ramp of a four-wheel drive vehicle that can cancel a residual torque immediately before a stop to prevent an adverse effect due to a residual torque during a stop of an actual vehicle Can be realized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

100: ramp stop torque control system
110:
120:
130:
140: 4 wheel switch
150:
160: 4-wheel drive unit

Claims (9)

An inclination detecting unit for detecting that the vehicle enters the ramp;
A stop detection unit for detecting a stop state of the vehicle;
A vehicle speed detector for detecting a vehicle speed when the vehicle is running;
A steering angle detector for detecting a steering angle of the vehicle;
A four-wheel switch for inputting an execution command for four-wheel drive of the vehicle;
A four-wheel drive unit for performing four-wheel drive of the vehicle in accordance with the execution command; And
A control unit for controlling the vehicle to enter a ramp, to maintain the steering angle at a constant angle, to input a brake pedal signal, and to release the residual torque before the vehicle executes the stop when the vehicle speed is reduced;
And a ramp control system for controlling the ramp.
The method according to claim 1,
The stop-
And detects the running state of the transmission for decelerating the vehicle speed caused by running of the vehicle and the running state of the brake pedal for stopping the rotational force of the front and rear wheels of the vehicle.
The method according to claim 1,
Wherein the inclination sensing unit includes a gyro sensor that measures a change in azimuth of the vehicle by using a property that maintains a predetermined constant direction set at all times.
delete The method according to claim 1,
The stop detection unit detects a stop state of the vehicle according to a vehicle speed detected through the vehicle speed detection unit or an input of a brake operation signal according to an operation of the brake pedal or a pressure signal of a brake cylinder, Torque control system.
(a) detecting that the inclination detecting unit has entered the ramp;
(b) a vehicle speed detecting unit detecting a vehicle speed along the running of the vehicle in the ramp;
(c) detecting a stop state of the vehicle in the ramp by the stop detection unit;
(d) When the vehicle enters the ramp, the steering angle of the vehicle is maintained at a constant angle, the brake pedal signal is input, and the vehicle speed is decreased, the control unit releases the four- Releasing the torque;
(e) controlling a torque output for ensuring traction performance when the control unit completely stops the vehicle at the ramp;
(f) determining whether the control unit is able to reattach the driver of the vehicle; And
(g) controlling the torque output of the four-wheel drive according to the degree of inclination when the control unit has a willingness to re-engage the driver;
And a control device for controlling the slope of the ramp.
delete The method according to claim 6,
In the step (c), the stop detection unit detects the stop state of the vehicle according to the vehicle speed detected through the vehicle speed detection unit, or the input of the brake operation signal according to the operation of the brake pedal, Of the ramp.
The method according to claim 6,
In the step (f), the control unit differentiates the vehicle speed detected through the vehicle speed detecting unit, or detects an input of an accelerator pedal through the stop sensing unit to determine whether the driver is ready to reattach.

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