WO2016093529A2

WO2016093529A2 - Method for controlling drive wheel

Info

Publication number: WO2016093529A2
Application number: PCT/KR2015/012906
Authority: WO
Inventors: 최진욱
Original assignee: 현대다이모스(주)
Priority date: 2014-12-11
Filing date: 2015-11-30
Publication date: 2016-06-16
Also published as: KR101641433B1; WO2016093529A3; KR20160071556A

Abstract

The present invention relates to a method for controlling a drive wheel when the tire air pressure of a vehicle is abnormal, the method being enabled to change a four-wheel drive mode and a two-wheel drive mode during traveling, is abnormal. The drive wheel control method of the present invention includes the steps of: monitoring the air pressure of vehicle tires; checking whether four-wheel drive is operational when the tire air pressure of an auxiliary drive wheel is abnormal; deselecting four-wheel drive if the vehicle is in four-wheel drive; and setting four-wheel drive prohibition if the vehicle is not in four-wheel drive. A drive system can be prevented from being damaged due to abnormal tire air pressure if the drive wheel control method of the present invention is carried out.

Description

Drive wheel control method

The present invention relates to a driving wheel control method when the tire inflation pressure of the vehicle that can change the four-wheel drive mode and the two-wheel drive mode during driving, in particular, it is possible to prevent the damage of the driving device of the vehicle in the situation of a sudden drop in tire pressure The present invention relates to a driving wheel control method.

In general, the four-wheel drive vehicle (4WD) is to distribute the drive torque of the engine to the front and rear wheels according to the driving situation to drive the front and rear wheels at the same time, slippery roads such as snow roads, ice roads, steep hills, muddy roads In such a road that requires a large driving force, driving slippage and road surface are minimized to provide driving safety and escape.

The driver can control the driving force distribution of the front and rear wheels according to the driving conditions by operating the four-wheel drive mode changeover switch mounted on the driver's seat. When the four-wheel drive mode changeover switch is turned on, the four-wheel drive controller of the four-wheel drive vehicle distributes the drive of the front and rear wheels by subtracting and distributing the drive torque applied to the front and rear wheels according to the vehicle speed and the opening degree of the throttle valve. Alternatively, in the auto mode, the four-wheel drive controller or other control device analyzes the driving situation and / or environment, and performs four-wheel drive if four-wheel drive is suitable, and if two-wheel drive is suitable 2 Control to perform wheel drive.

However, in the conventional four-wheel drive vehicle (4WD) when operating in the four-wheel drive mode when the tire punctured, the driving system will be overwhelmed according to the difference in the accompanying diameter of the front and rear tires, which may hinder subsequent failure and driving stability. have.

The present invention is to provide a driving wheel control method that can prevent the drive system damage due to the tire pressure abnormality.

According to an aspect of the present invention, there is provided a driving wheel control method comprising: monitoring tire air pressure of a vehicle; If the air pressure of the tire of the auxiliary driving wheel is abnormal, checking whether the four-wheel drive is performed; Canceling the four-wheel drive state if the four-wheel drive state; And setting the 4 wheel driving prohibition if it is not in the 4 wheel driving state.

Here, in the monitoring step, it is possible to receive the value measured in the TPMS device installed in each tire.

Here, the determination of the pneumatic pressure of the tire of the auxiliary drive wheel is a method of determining that the pneumatic pressure measurement value does not reach a predetermined reference value or whether the difference between the pneumatic pressure measurement value at the previous measurement time point and the pneumatic pressure measurement value at the current measurement time point exceeds a predetermined reference value. Can be performed in a deterministic manner.

Here, in the step of checking whether the four-wheel drive, the position of the two-wheel or four-wheel setting device of the vehicle can be determined.

Here, in the step of setting the four-wheel drive prohibition, a value indicating the four-wheel drive prohibition can be written in a flag, a counter, or a register.

Here, in the step of setting the four-wheel drive prohibition, it is possible to operate the cutoff switch for the four-wheel drive operation path.

Implementing the driving wheel control method of the present invention according to the above configuration, there is an advantage that can prevent the drive system damage due to the tire air pressure abnormality.

In another aspect, the present invention has the advantage that can increase the marketability through the safety of the vehicle.

1 is a flowchart illustrating a driving wheel control method according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a driving wheel control apparatus for a four-wheel drive vehicle capable of performing the driving wheel control method illustrated in FIG. 1.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. The terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When a component is referred to as being connected or connected to another component, it may be understood that the component may be directly connected to or connected to the other component, but there may be other components in between. .

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

In this specification, the terms including or including are intended to designate that there exists a feature, a number, a step, an operation, a component, a part, or a combination thereof described in the specification, and one or more other features or numbers, It can be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

In addition, the shape and size of the elements in the drawings may be exaggerated for more clear description.

1 illustrates a driving wheel control method according to an embodiment of the present invention.

The illustrated driving wheel control method includes: monitoring tire air pressure of the vehicle (S110); If the air pressure of the tire of the auxiliary drive wheel is abnormal (S120), checking whether the four-wheel drive (S140); If the four-wheel drive state (S160); And setting the 4 wheel driving prohibition if it is not the 4 wheel driving state (S170).

The illustrated driving wheel control method relates to a driving wheel control method of a vehicle that can change a four-wheel drive mode and a two-wheel drive mode while driving, and switching between the four-wheel drive mode and the two-wheel drive mode during driving in such a vehicle is performed by the driver. It may be performed by the instruction or the situation determination of the control device. Here, the four-wheel drive mode is a mode in which driving force is applied to both of two drive shafts (front wheel drive shaft and rear wheel drive shaft) of the vehicle, and the two-wheel drive mode is a mode in which driving force is applied to one drive shaft of the vehicle.

The drive shaft to which driving force is applied in both the four-wheel drive mode and the two-wheel drive mode is called a main drive shaft (always drive shaft) and another drive shaft is called an auxiliary drive shaft (non-always drive shaft), and the wheels connected to each drive shaft are also the same rules. (Always driving wheel) and auxiliary driving wheel (non-always driving wheel).

In the step S110, to determine the measured value of the air pressure for all the running tires of the vehicle, in the application of the idea of the present invention, only the measured air pressure value of the tire of the auxiliary drive wheel can be used.

The steps S110 and S120 may be performed by receiving a value measured by the TPMS device installed in each tire.

The step S120 may be performed in a manner of determining that the air pressure measurement value does not reach a predetermined reference value and / or in a method of determining whether a difference between the air pressure measurement value at a previous measurement time point and the air pressure measurement value at a current measurement time point exceeds a predetermined criterion. Can be.

The step S140 may be performed in a manner of reading the setting value of the previous four-wheel drive setting operation or directly determining the position of the two-wheel / four-wheel setting device. The latter case enhances safety.

The step S160 may be performed by transmitting a 2 wheel setting command to the 2 wheel / 4 wheel setting device.

The step S170 may be performed by writing a value indicating 4 wheel driving prohibition in a flag, a counter, or a register, or by turning on / off a cutoff switch for a 4 wheel driving path in hardware. have.

The four-wheel drive operation path in which the cutoff switch is installed may be a path for transmitting a signal for turning on / off a driving device for operating a mechanical device that controls a control device applying a driving force to an auxiliary drive shaft, or for the driving device. It may be a power supply path.

The TPMS prevents the 4WD from operating automatically when the tire's air pressure drop is detected at any time, so that the vehicle's driving performance is not degraded or subsequent failure occurs.

FIG. 2 is a block diagram of a control system including a driving wheel control device 50 of a four-wheel drive vehicle capable of performing the driving wheel control method shown in FIG. 1. The illustrated drive wheel control device can control torque distribution during four-wheel drive.

The control system including the illustrated driving wheel control device 50 includes a vehicle position determining unit 51 which provides information on whether the vehicle is traveling in the city, and an engine torque sensor 20 for detecting engine torque. And, a wheel speed sensor 30 for sensing the wheel speed of the front wheel and the rear wheel, a throttle opening degree sensor 40 for detecting the opening amount of the throttle valve, the city running mode, the throttle opening is 50% or less, and the wheel slip is If it is smaller than the allowable value, it is controlled in two-wheel drive mode, and it is controlled to distribute the driving force in the lock mode when it is not in the city driving mode or in the highway driving mode, and the throttle opening in the highway driving mode or in the city driving mode. Is controlled to distribute the driving force in AUTO mode when is greater than 50% or when the throttle opening is 50% or less in the city driving mode but the wheel slip is above the allowable value. In response to a control signal input from the controller 50, and the above-described drive wheel control device 50 may include an actuator (60) for transmitting the driving force distributed to the front and rear wheels. The vehicle position determiner 51 may include a GPS receiver.

For example, the front and rear wheel driving force distribution determining unit 52 of the drive wheel control device 50 drives the actuator 60 in two wheels so as to be suitable for a vehicle that does not rapidly accelerate in the city and does not have a large wheel slip. 2WD) mode, and in the four-wheel drive mode, it is possible to control to distribute the driving force as a lock mode for equally distributing the torque of the front wheel and the rear wheel.

Alternatively, the front and rear wheel driving force distribution determining unit 52 of the drive wheel control device 50 distributes the driving force as a dynamic (DYNAMIC) mode in which the torque of the front and rear wheels is automatically distributed according to the situation in the four-wheel drive mode. Actuator 60 can be controlled.

Alternatively, the front and rear wheel drive force distribution determining unit 52 of the drive wheel control device 50 may provide driving force as an AUTO mode that automatically switches between the four-wheel drive mode and the two-wheel drive mode according to the vehicle and / or road conditions. The actuator 60 can be controlled to dispense.

The driving wheel control device 50 may perform the driving wheel control method of the flowchart of FIG. 1 according to the spirit of the present invention.

It should be noted that the above embodiment is for the purpose of illustration and not for the purpose of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

Claims

Monitoring tire inflation pressure of the vehicle;

If the air pressure of the tire of the auxiliary driving wheel is abnormal, checking whether the four-wheel drive is performed;

Canceling the four-wheel drive state if the four-wheel drive state; And

Setting the four-wheel drive prohibition if the four-wheel drive state is not

Drive wheel control method comprising a.
The method of claim 1,

In the monitoring step,

Drive wheel control method that receives the measured value from the TPMS device installed on each tire.
The method of claim 1,

The pneumatic pressure determination of the tire of the auxiliary drive wheel is a method of determining that the pneumatic pressure measurement value does not reach a predetermined reference value or determining whether the difference between the pneumatic pressure measurement value at the previous measurement time point and the pneumatic pressure measurement value at the current measurement time point exceeds a predetermined standard. The drive wheel control method performed in a manner.
The method of claim 1,

In the step of checking whether the four-wheel drive,

A drive wheel control method for determining the position of a two-wheel or four-wheel setting device of a vehicle.
The method of claim 1,

And in the setting of the four-wheel drive prohibition, writing a value indicating the four-wheel drive prohibition to a flag, a counter, or a register.
The method of claim 1,

In the step of setting the four wheel drive prohibition,

A drive wheel control method for operating a disconnect switch for a four-wheel drive operation path.