KR20050112517A - Brake method of automobile and apparatus the same - Google Patents

Abstract

The present invention relates to a braking device and a braking method of a vehicle for braking a vehicle by detecting a dangerous situation and a sudden situation. The present invention continuously measures the distance D between the front object and the vehicle by the sensor unit 10, and continuously measures the speed V ₁ and the acceleration a _{1 of the} vehicle by the measuring unit 15. Measure and compare these measured values to determine if they are at risk. As a result of the determination, if it is determined that the dangerous situation, the auxiliary brake 30 separately provided in the vehicle wheel operates to decelerate its own weight, and turns on the emergency light 40 to give attention to the rear vehicle and transmit a guide message to the driver. And the degree of judgment of the risk situation allows the user to set differently according to his driving habit in advance. According to the present invention, even if the driver's response is slow in the event of a dangerous situation, the vehicle is braked, and thus the safety of the vehicle is improved, and the driver can directly adjust the conditions for determining the dangerous situation, even though it is not a dangerous situation. And the vehicle is braked by the operation of the auxiliary brake, there is an advantage that the driver does not feel uncomfortable.

Description

Brake method of automobile and apparatus the same}

The present invention relates to a braking apparatus for a vehicle and a braking method thereof, and more particularly, to an auxiliary brake for automatically detecting and operating a dangerous situation.

In general, when the driver recognizes the situation ahead and wants to decelerate, the vehicle decelerates by braking. At this time, the stopping distance required to stop the vehicle is a value obtained by adding the braking distance and the princess distance.

The braking distance is the time it takes for the brake of the vehicle to start and stop to operate, and the princess distance refers to the distance that the vehicle moves until the driver applies the brake by recognizing a dangerous situation in front of the vehicle.

Recently, automobiles have been making efforts to develop technologies for reducing the stopping distance, and as a result, ABS brakes and the like have been developed and mounted to reduce the braking distance. However, the princess distance was determined by the driver, so it was not easy to solve technically.

In other words, when the driver is embarrassed when a dangerous situation occurs, or when the driver does not detect a dangerous situation in front of the driver, the princess street becomes longer, which increases the probability of an accident and causes a large accident when an accident occurs.

Therefore, in recent years, there is an object that prevents the driver from recognizing or responding late to a dangerous situation, or to prevent the accident from happening at a speed exceeding a certain value. A device for automatically braking the case has been developed.

However, the prior art as described above has the following problems.

That is, even if the situation is not a dangerous situation, that is, even if the distance between the car is narrowed by the driver's intention, since the auxiliary brake of the car operates to cause inconvenience during driving, there is a problem that cannot be applied to the actual vehicle. In other words, there is a case where the distance to the front vehicle must be narrowed even when driving at high speed for overtaking the vehicle. In this case, the braking is caused by the operation of the auxiliary brake, so that the driver cannot drive as intended.

In the related art, since the driver cannot selectively adjust the operation state of the auxiliary brake, there is a problem in that the driving method must be uniformly applied to different drivers.

Therefore, due to these problems, it is practically difficult to mount the auxiliary brake on the actual vehicle.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an auxiliary brake of a vehicle and a braking method thereof so that the auxiliary brake operates only in a sudden situation not intended by the driver. .

Another object of the present invention is to provide an auxiliary brake of a vehicle and a braking method thereof, in which a driver can easily change a braking condition of an auxiliary brake.

According to a feature of the present invention for achieving the above object, the present invention provides a sensor unit for measuring the distance (D) between the front object and the vehicle, and the speed (V ₁ ) and acceleration (a ₁ ) of his vehicle Measurement unit to measure, the distance between the front object and the subject vehicle (D) obtained from the sensor unit and the measuring unit, the relative speed of the front object (V ₁₂ ) from the speed (V ₁ ) and acceleration (a ₁ ) of the vehicle And a data processor for calculating a relative acceleration (a ₁₂ ), a controller for determining whether a dangerous situation is generated according to the processing result of the data processor, and transmitting a brake signal, and an auxiliary brake controlled by the brake signal of the controller. It is configured by.

In addition, when the controller transmits a braking signal, the emergency light of the vehicle may be turned on.

In addition, when the control unit transmits a braking signal, the control unit may further include a voice guide unit for guiding the driver with a voice that the auxiliary brake is operating, the auxiliary brake system of the vehicle ON / OFF It can be configured to include a switch.

Meanwhile, the present invention provides a first step of measuring a distance (D) between an object in front of a vehicle and a vehicle in the sensor unit, and a second (V ₁ ) and acceleration (a ₁ ) of the vehicle in the measurement unit. And the relative speed of the front object in the data processor using the distance (D) between the front object obtained from the sensor unit and the measurement unit (D), the speed (V ₁ ) and the acceleration (a ₁ ) of the vehicle. V ₁₂ ) and a third step of calculating the relative acceleration (a ₁₂ ), the distance D between the front object and the subject vehicle, the acceleration of the subject vehicle (a ₁ ), and the calculated relative velocity of the front object in the data processor. ₁₂ ) a fourth step of determining whether or not a dangerous situation by using the relative acceleration (a ₁₂ ), and a fifth step of transmitting a braking signal from the control unit if it is determined that the dangerous situation is determined by the fourth step, and the And a sixth step of activating the auxiliary brake upon receiving the braking signal. .

In this case, the fourth step is a case where the distance D between the front object and the vehicle is within the braking distance DB of the vehicle and the relative speed V ₁₂ of the front object is less than or equal to a predetermined value x ₁ based on the host vehicle. In this case, the distance D between the front object and the vehicle is within the braking distance DB of the vehicle, and the relative speed V ₁₂ of the front object is a constant value (x). ₁ ) or less, and when the absolute value of the sum of the acceleration (a ₁ ) of the host vehicle and the relative acceleration (a ₁₂ ) of the forward object based on the host vehicle is less than or equal to the constant value (x ₂ ), it may be determined as a dangerous situation.

In this case, the constant value x ₁ and the constant value x ₂ may be set to zero.

On the other hand, the constant value (x ₂ ) may be set to a positive number of 10 kHz or less.

The user may input the constant value x ₁ and the constant value x ₂ .

According to the present invention having the configuration as described above, the vehicle is stopped as quickly as possible when an accident occurs during the operation of the vehicle, there is an advantage that can prevent the accident.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a braking device for a vehicle according to the present invention as described above will be described in detail.

1 is a block diagram showing the configuration of a vehicle braking apparatus according to the present invention, Figure 2 is a perspective view showing the auxiliary brake constituting the configuration of the embodiment of the present invention.

As shown in these figures, the braking device of a vehicle according to the present invention comprises a sensor unit 10 for measuring the distance (D) to the front object. The sensor unit 10 includes a transmitting unit (not shown) for transmitting ultrasonic waves and a receiving unit (not shown) for receiving reflected waves from which the transmitted ultrasonic waves are reflected by the front object. The sensor unit 10 calculates a time when the ultrasonic wave transmitted from the transmitting unit is received in the receiving unit and measures the distance D between the vehicle and an object in front of the vehicle. The sensor unit 10 calculates a distance value at every predetermined period and transmits the distance value to the data processor 20 to be described later. The operating period of the sensor unit 10 is set as short as possible within the range allowed by the processing capacity of the sensor unit 10, preferably set to a time of 1/10 seconds or less.

As described above, the sensor unit 10 may measure the distance D from the front object using ultrasonic waves, but may measure the distance using light waves, lasers, infrared rays, electromagnetic waves, or the like. The method of measuring the distance using these waves or lasers is a well-known technique in the field of surveying and so will not be described in detail.

On the other hand, the present invention comprises a measuring unit 15 for measuring the speed (V ₁ ) and the acceleration (a ₁ ) of the vehicle, the measuring unit 15 is the speed of the vehicle from the wheel of the vehicle ( V ₁ ) is measured and the acceleration a ₁ of the subject vehicle is measured from the rate of change of the velocity V ₁ of the subject vehicle. The velocity V ₁ and the acceleration a ₁ of the own vehicle measured as described above are transmitted to the data processor 20 to be described later.

The information calculated by the sensor unit 10 and the measuring unit 15 is collected by the data processing unit 20. The data processor 20 is a part for calculating a relative speed V ₁₂ and a relative acceleration a ₁₂ with respect to the own vehicle of the front object.

At this time, the relative velocity (V ₁₂ ) and relative acceleration (a ₁₂ ) of the prospective object are calculated from the equation in the table below.

                     -Below-

Relative velocity of forward object (V ₁₂ ) [V ₁₂ = ΔD / Δt] Relative acceleration of forward object (a ₁₂ ) [a ₁₂ = ΔV ₁₂ / Δt]

In addition, the present invention comprises a control unit 25 for receiving the calculated data from the data processing unit 20 determines the operation of the auxiliary brake (30). The controller 25 compares the distance D measured by the sensor unit 10, the relative acceleration a ₁₂ of the front object, the acceleration a ₁ of the own vehicle, and the relative acceleration a ₁₂ of the front object. Determine whether or not the auxiliary brake (30). If it is determined that the operation of the auxiliary brake 30 is necessary, the controller 25 transmits a braking signal.

The brake signal of the control unit 25 is received by the auxiliary brake 30. The auxiliary brake 30 operates when the brake signal is received to brake the vehicle.

As shown in FIG. 2, the auxiliary brake 30 is mounted separately from the main brake 35 to operate when the braking signal is received regardless of whether the main brake 35 is operated. The auxiliary brake 30 is preferably a brake of the same type as the main brake 35. That is, when used in the front wheel of a general passenger car is provided in the form of a disc brake, when mounted on the rear wheel is provided in the form of a drum brake, in the case of a large truck it may be provided in the form of a power brake.

On the other hand, the braking signal of the control unit 25 is transmitted to the emergency light 40 and the voice guide unit 45. When the braking signal is transmitted to the emergency light 40, the emergency light 40 is turned on to notify that a dangerous situation has occurred in front of the car following the rear to prevent a collision accident. In addition, when the braking signal is transmitted to the voice guide unit 45, the voice guide unit 45 informs the driver that a dangerous situation has occurred in front of the driver and that the auxiliary brake 30 is operating accordingly.

On the other hand, the above-described braking device of the vehicle is provided with an ON / OFF switch that can control the connection of the power so that the driver can selectively use it.

Hereinafter, a braking method of a vehicle braking apparatus according to the present invention will be described in detail with reference to a data collection and processing procedure.

3 is a flow chart showing a preferred embodiment of a braking method of a vehicle braking apparatus according to the present invention, Figure 4 is a flow chart showing another embodiment of a braking method of a vehicle braking apparatus according to the present invention.

According to a preferred embodiment of the present invention, as shown in FIG. 3, after the system of the vehicle braking apparatus according to the present invention is started, the first step S1 of measuring the distance D with the front object in the sensor unit 10 (S1). Starts with). As described above, the sensor unit 10 continuously measures the distance D between the front object and the subject vehicle every short time, and transmits the measured value to the data processor 20.

Meanwhile, the vehicle drafting apparatus according to the present invention performs the second step S2 of measuring the speed V ₁ and the acceleration a _{1 of the} vehicle while performing the first step S1. The speed V ₁ and the acceleration a ₁ of the subject vehicle are preferably measured every short time, and the rotation speed of the vehicle wheel is preferably measured and calculated. The speed V ₁ and the acceleration a ₁ of the own vehicle calculated by the second step S2 are also transmitted to the data processor 20.

After performing the first step (S1) and the second step (S2), the relative speed (V ₁₂ ) and the relative acceleration (a ₁₂ ) of the front object through the data obtained from the sensor unit 10 and the measurement unit 15 ) Is performed by the data processing unit 20.

At this time, the relative speed (V ₁₂ ) of the front object is V ₁₂ = ΔD / Δt and the relative acceleration (a ₁₂ ) of the front object is a ₁₂ = ΔV ₁₂ / Δt.

The distance D with the front object, the relative acceleration (a ₁₂ ) of the front object, the acceleration (a ₁ ) of the vehicle and the relative acceleration (a ₁₂ ) of the front vehicle calculated through the first to third steps (S3). ) Is transmitted to the control unit 25. In addition, the controller 25 compares the transmitted data to perform a fourth step of determining whether the situation is dangerous.

It is determined whether the risk situation of the fourth step is satisfied by the following condition. That is, the distance D between the front object and the subject vehicle should be closer than the braking distance DB of the subject vehicle (S41), and the relative speed V ₁₂ of the front object is equal to or less than the predetermined value (x ₁ ) (S42). Should be At this time, the constant value x ₁ may be 0 or a small value may be set among negative numbers. In detail, first, when the distance D to the front object is within the braking distance DB, the emergency brake is operated when the object in front of the vehicle is closer to the vehicle or maintained at the same distance.

At this time, as the predetermined value (x ₁ ) is set smaller, the auxiliary brake 30 operates only when the front object is rapidly approached.

On the other hand, according to another embodiment of the present invention, it is possible to set the auxiliary brake 30 to operate by adding one condition as shown in FIG. That is, the distance (D) between the front object and the subject vehicle should be closer than the braking distance (DB) of the subject vehicle (S41), while the relative speed (V ₁₂ ) of the front object is equal to or less than the predetermined value (x ₁ ) (S42). ), The auxiliary brake 30 is operated when the absolute value of the sum of the acceleration a ₁ of the own vehicle and the relative acceleration a ₁₂ of the front object is equal to or less than a predetermined value (x ₂ ) (S43). The constant value x ₂ is preferably set to 0 or preferably set to a positive number of 10 mu m or less.

This means that the distance D between the front object and the subject vehicle is within the braking distance DB, the distance between them becomes closer and closer, and the distance D between the front object and the subject vehicle is closer to the acceleration of the subject vehicle. This is because the auxiliary brake 30 is operated only when the deceleration of the front vehicle is not. Therefore, the auxiliary brake 30 does not operate when the vehicle is accelerated to approach the object in front of the braking distance DB.

The constant value x ₁ and the constant value x ₂ are values previously input by the driver. That is, the driver may adjust the operating condition of the auxiliary brake 30 by setting the constant value x ₁ and the constant value x ₂ differently.

If it is determined that the dangerous situation is the result of the fourth step, the control unit 25 performs a fifth step S5 of transmitting a braking signal to the auxiliary brake 30, the emergency light 40, and the voice guide unit 45. .

As a result, when the auxiliary brake 30 receives the braking signal, the auxiliary brake 30 performs a sixth step S6 of braking the vehicle.

On the other hand, the emergency light 40 receives the braking signal of the four stages is turned on, the voice guide unit 45 to the driver by voice that the vehicle is being braked by the operation of the auxiliary brake 30 in accordance with the dangerous situation. Do it.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

In the braking apparatus and the braking method of the vehicle according to the present invention as described in detail above, the following effects can be expected.

That is, if the driver's intention is close to the front object within the safety distance, the auxiliary brake does not work. In fact, the auxiliary brake operates only by deceleration or sudden appearance of the front object. There is an advantage that can be protected by the auxiliary brake only in dangerous accidents without receiving.

And the present invention has the advantage that the driver can adjust the operating range of the auxiliary brake directly to adjust the operating range of the auxiliary brake according to the driving habits of the driver.

1 is a block diagram showing the configuration of a vehicle braking apparatus according to the present invention.

Figure 2 is a perspective view showing the auxiliary brake constituting the embodiment of the present invention.

Figure 3 is a flow chart showing a preferred embodiment of the braking method of a vehicle braking apparatus according to the present invention.

Figure 4 is a flow chart showing another embodiment of a braking method of a vehicle braking apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: sensor unit 15: measuring unit

20: data processing unit 25: control unit

30: auxiliary brake 35: main brake

40: emergency light 45: voice guidance

50: ON / OFF switch S1: first step

S2: second step S3: third step

S41: first condition S42: second condition

S43: third condition S5: fifth step

S6: Sixth Step x ₁ , x ₂ : Constant Value Input

D: Distance between own vehicle and front object

V ₁ : Speed of own vehicle

a ₁ : acceleration of own vehicle

V ₁₂ : Relative velocity of forward object based on own vehicle

a ₁₂ : Relative acceleration of forward object based on own vehicle

DB: Braking distance of own vehicle

Claims (12)

A sensor unit measuring a distance D between the front object and the vehicle; A measuring unit measuring a speed V ₁ and an acceleration a ₁ of the vehicle; The distance (D) between the front object and the subject vehicle obtained by the sensor unit and the measuring unit, the relative speed of the front object (V ₁₂ ) and the relative acceleration of the front vehicle from the velocity (V ₁ ) and the acceleration (a ₁ ) of the subject vehicle a data processing unit for calculating (a ₁₂ ); A control unit for comparing a processing result of the data processing unit to determine whether a dangerous situation and transmitting a braking signal when determined as a dangerous situation; And Braking apparatus for a vehicle, characterized in that it comprises an auxiliary brake controlled by the brake signal of the control unit. The method of claim 1, When the control unit sends a braking signal, the emergency light of the vehicle, characterized in that the braking device of the vehicle. The method according to claim 1 or 2, When the control unit sends a braking signal, the braking device of the vehicle, characterized in that it further comprises a voice guide unit for guiding the driver to the driver by the voice by the control. The method according to claim 1 or 2, A braking device for a vehicle, characterized in that it further comprises an ON / OFF switch that allows the driver to selectively determine whether or not to operate the auxiliary brake. A first step of measuring a distance D between an object in front of the vehicle and the vehicle in the sensor unit; A second step of measuring, by the measuring unit, the speed V ₁ and the acceleration a _{1 of the} vehicle; The relative speed (V ₁₂ ) and the relative acceleration of the front object using the distance (D) between the front object and the subject vehicle obtained by the sensor unit and the measurement unit, the speed (V ₁ ) and the acceleration (a ₁ ) of the front vehicle. (a ₁₂ ) calculating a third step; The data processor determines whether the vehicle is in a dangerous situation by using the distance D between the front object and the vehicle, the acceleration of the vehicle (a ₁ ), the calculated relative speed (V ₁₂ ) and the relative acceleration (a ₁₂ ). A fourth step of making; A fifth step of transmitting, by the controller, a braking signal when it is determined that the dangerous situation is determined as the fourth step; And And a sixth step of operating the auxiliary brake when the braking signal is received. The method of claim 5, The fourth step, Characterized as a dangerous situation when the distance (D) between the front object and the vehicle is within the braking distance of the vehicle and the relative speed (V ₁₂ ) of the front object is less than the predetermined value (x ₁ ) based on the vehicle. Braking method of a vehicle braking device. The method of claim 5, The fourth step, The distance D between the front object and the vehicle is within the braking distance of the vehicle, and the relative speed V ₁₂ of the front object is less than or equal to the constant value x _{1 based on the} vehicle, and the acceleration of the vehicle is a _1. Braking method for a vehicle braking device characterized in that it is determined as a dangerous situation when the absolute value of the sum of the relative acceleration (a ₁₂ ) of the front object is less than a predetermined value (x ₂ ). The method according to claim 6 or 7, The predetermined value (x ₁ ) is a braking method of a vehicle braking device, characterized in that 0 (㎧). The method of claim 7, wherein The predetermined value (x ₂ ) is a braking method of a vehicle braking device, characterized in that zero. The method of claim 7, wherein The predetermined value (x ₂ ) is a braking method of a vehicle braking device, characterized in that the positive number of 10 (10) or less. The method of claim 6, The predetermined value (x ₁ ) is a braking method of a vehicle braking device, characterized in that the user can input. The method of claim 7, wherein The constant value (x ₁ ) and the constant value (x ₂ ) is a braking method of a vehicle braking device, characterized in that the user can input.