KR20090062520A - Apparatus and method of inertia driving guiding based on inter-vehicle distance monitoring - Google Patents

Abstract

An inertia driving guiding system by the measurement of a gap spacing, and its guiding method are provided to improve fuel efficiency by informing whether it is possible to brake with the inertia driving only or not. An inertia driving guiding system(100) by the measurement of a gap spacing comprises a radar sensor part(110) which produces the gap spacing data to the preceding car; a goal distance calculation part(120) which outputs the controlled car goal distance by using the gap spacing data; an inertia driving determination part(130) which outputs the inertia driving data and outputs the inertia driving distance by using the inertia driving data; and a main control part(140) which controls so as to allow the inertia driving possible data to be displayed if the controlled car goal distance is greater than the inertia driving distance.

Description

Inertial driving guidance system by measuring distance between cars and its method {Apparatus and method of inertia driving guiding based on inter-vehicle distance monitoring}

The present invention relates to an inter-vehicle distance control system, and more particularly, to an inertial driving guidance system and method using the inter-vehicle distance measurement.

In the recent high oil price era, raising fuel economy has become an important issue. In particular, as the use of automobiles increases rapidly, increasing fuel economy of automobiles has become the most important issue. There are two ways to increase the fuel economy of a car: to design an efficient car and to make the driver drive the car more efficient.

One way for a driver to drive a car efficiently is by the user to make the most of inertia (braking, engine brake) during braking. That is, in the case of braking due to inertial driving, braking is performed only by basic resistance such as rolling resistance or air resistance, so that no additional energy is consumed according to the brake operation. Therefore, when braking due to inertia driving is used, fuel economy of an automobile can be increased.

In general, however, the driver cannot determine whether braking is possible only by inertia driving when the preceding vehicle is stopped. That is, the general driver cannot determine whether the control vehicle must be braked by operating the brake pedal when the preceding vehicle is stopped or whether the control vehicle can be braked only by inertia driving.

Therefore, in order to use the inertial driving naturally, a lot of driving experience of the driver is required, and if the driver who does not rely only on the inertial driving, there is a high possibility of collision with the preceding vehicle. Accordingly, there is a need for an apparatus and method for informing a driver whether braking is possible only by inertia driving based on the distance from the preceding vehicle and the driving state of the control vehicle.

An object of the present invention is to provide an inertial driving guidance system and a method for informing a driver whether braking is possible only by inertial driving based on a distance from a preceding vehicle and a driving state of a control vehicle.

According to an aspect of the invention, the radar sensor unit for generating the inter-vehicle distance data for the preceding vehicle; A target distance calculator for calculating a control vehicle target distance using the inter-vehicle distance data; An inertial driving determination unit configured to calculate inertial driving data and calculate an inertial driving distance using the inertial driving data; And if the control vehicle target distance is greater than the inertial driving distance is provided an inertial driving guidance system including a main control unit for controlling to display the inertial driving possible data.

Here, the inter-vehicle distance data may include at least one of a relative distance value, a relative speed value, and a relative acceleration value.

In addition, the inertial driving data includes wheel speed, brake gain (KB), horizontal axis action force, vertical axis action force, friction coefficient between road surface and tire, tire companion diameter, wheel angular velocity, control vehicle speed, slip ratio, slip slope And a maximum friction coefficient.

According to another aspect of the invention, generating the inter-vehicle distance data for the preceding vehicle; Calculating a control vehicle target distance using the inter-vehicle distance data; Calculating inertial driving data and calculating an inertial driving distance using the inertial driving data; And if the control vehicle target distance is greater than the inertial driving distance is provided an inertial driving guidance method comprising the step of controlling to display the inertial driving possible data.

Here, the inter-vehicle distance data may include at least one of a relative distance value, a relative speed value, and a relative acceleration value.

In addition, the inertial driving data includes wheel speed, brake gain (KB), horizontal axis action force, vertical axis action force, friction coefficient between road surface and tire, tire companion diameter, wheel angular velocity, control vehicle speed, slip ratio, slip slope And a maximum friction coefficient.

According to another aspect of the present invention, a program of instructions that can be executed by the inertial driving guidance system is tangibly implemented to perform the above-described inertial driving guidance method, and can be read by the inertial driving guidance system. A recording medium on which a program is recorded is provided.

The inertial driving guidance system and the method according to the present invention can inform the driver whether braking is possible only by inertia driving, based on the distance from the preceding vehicle and the driving state of the control vehicle, thereby increasing fuel economy of the control vehicle. .

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an inertial driving guidance system according to the present invention.

Referring to FIG. 1, the inertial driving induction system 100 according to the present invention includes a radar sensor unit 110, a target distance calculator 120, an inertial driving determination unit 130, a main controller 140, and a display unit ( 150). Hereinafter, the operation of each component of the inertial driving guidance system 100 will be described.

The radar sensor unit 110 generates inter-vehicle distance data for the preceding vehicle. Here, the inter-vehicle distance data may be data including any one or more of a relative distance value, a relative speed value, and / or a relative acceleration value. In addition, the radar sensor unit 110 may include a radar sensor. That is, the radar sensor unit 110 outputs a radio wave using a radar sensor, and analyzes the radio wave reflected by the preceding vehicle to calculate the relative distance value, the relative speed value, and / or the relative acceleration value for the preceding vehicle. can do.

The target distance calculator 120 calculates the control vehicle target distance using the inter-vehicle distance data of the preceding vehicle generated by the radar sensor unit 110. Here, the control vehicle target distance may be information about a distance between the control vehicle equipped with the inertial driving guidance system 100 and the preceding vehicle. For example, the target distance calculator 120 may calculate a point at which the preceding vehicle stops completely (ie, the stationary vehicle stationary point) by using the relative speed value and / or the relative acceleration value of the preceding vehicle, and the control vehicle. The target distance of the control vehicle can be calculated by calculating the distance between the presently located point and the calculated preceding vehicle stationary point.

The inertial driving determination unit 130 measures the driving environment of the control vehicle to calculate a distance (hereinafter, referred to as an inertia driving distance) in which the control vehicle can travel only by inertia driving. That is, the inertial driving determination unit 130 calculates inertial driving data, and calculates inertial driving acceleration using the calculated inertial driving data. In addition, the inertial driving distance is calculated using the inertial driving acceleration. Here, the inertial driving data is data for calculating the inertial driving acceleration, wheel speed, brake gain (KB), horizontal axis force, vertical axis force, friction coefficient between road surface and tire, tire companion diameter, wheel angular velocity, control vehicle speed, A slip rate, a slip slope, a maximum friction coefficient, and the like in each wheel may be included. Also, the inertial driving acceleration is the acceleration of the control vehicle calculated using the calculated inertial driving data. As a result, the inertial driving determination unit 130 may calculate the inertial driving distance. Hereinafter, a method of calculating the inertial driving distance by the inertial driving determination unit 130 will be described with reference to FIG. 2.

2 is a block diagram of an inertial driving determination unit according to the present invention.

Referring to FIG. 2, the inertial driving determination unit 130 may include a brake gain detection unit 200, a horizontal axis force detection unit 210, a vertical axis force force detection unit 220, a friction coefficient calculation unit 230, and a tire companion diameter detection. Unit 240, wheel angular velocity detection unit 250, control vehicle speed detection unit 260, slip calculation unit 270, slip slope calculation unit 280 and maximum friction coefficient calculation unit 290 and inertial driving distance calculation Unit 295.

The brake gain detection unit 200 extracts the brake gain (KB) from the wheel speed detected from the wheel speed sensor (not shown) mounted on each wheel of the control vehicle and the brake pressure acted by the brake actuator. Is applied to the friction coefficient calculating unit 213.

The horizontal axis action force detecting unit 210 detects an action force acting as a horizontal axis on the tire of each wheel from the applied brake gain KB and the shift stage torque TS, and outputs information about the applied force. The acting force (Ft) acting on the horizontal axis can be estimated by the torque (TS) and brake gain (KB) at the current shift stage, and the torque (TS) at the current shift stage is the torque (Tt) of the torque converter and the wheel. Can be calculated by speed. In addition, the torque Tt of the torque converter can be calculated by the engine torque Tnet extracted from the engine map according to the throttle opening degree, the engine speed, the carrier speed, and the gear state (shift stage). The brake gain KB can be calculated from the brake pressure acting on each wheel by the brake actuator and the speed of each wheel.

The vertical axis action force detecting unit 220 detects the action force acting as a vertical axis on the tire of each wheel by a calculation considering the total weight of the vehicle and the dynamics of the vehicle, including the cargo loaded on the vehicle, the number of occupants, etc. Is applied to the friction coefficient calculating unit 230.

The friction coefficient calculating unit 230 calculates a friction coefficient between the road surface and the tire from the relationship between the acting force acting on the tire of each wheel and the acting force acting on the vertical axis, and applies the information to the slip slope calculating unit 280. .

The tire companion diameter detection unit 240 detects a companion diameter of the tire, which is a distance from the road surface, based on the center axis of the wheel from the force acting on the tire of each wheel, and transmits information on the slip calculation unit 270 to the slip calculation unit 270. Is authorized.

The wheel angular velocity detection unit 250 is a wheel speed sensor mounted on each wheel, and detects the speed of the wheel from the angular speed of each wheel and applies the information to the slip calculation unit 217.

The control vehicle speed detection unit 260 is a control vehicle speed sensor mounted on the transmission output shaft. The control vehicle speed detection unit 260 detects a current driving control vehicle speed from the output shaft rotational speed and applies information about the slip calculation unit 270 to the slip calculation unit 270.

The slip calculation unit 270 detects a slip ratio at each wheel by calculating algorithms of the speed of each wheel, the current control vehicle speed, and the tire companion diameter through a set algorithm, and stores the information on the slip slope calculation unit. To 280.

The slip slope detecting unit 280 analyzes the friction coefficient between the road surface and the tire applied by the friction coefficient calculating unit 230 and the slip ratio on each wheel applied by the slip calculating unit 270 through a preset algorithm to determine the slip slope. After detecting (Slip Slope), it is output.

The maximum friction coefficient calculating unit 290 estimates the maximum friction coefficient between the road surface and the tire according to the initial slope of the slip and friction coefficients. The maximum friction coefficient calculating unit 290 estimates the maximum friction coefficient by using the relationship between the slip and the friction coefficient, and applies the characteristics of the friction coefficient that increases to increase the slip of the tire and then decreases again when the slip is excessive. The maximum friction coefficient between the road surface and the tire can be estimated. Typically, the maximum coefficient of friction is 1.0 for dry road surfaces.

The inertial driving distance calculation unit 295 calculates the inertia driving distance by using the maximum static friction coefficient calculated by the maximum friction coefficient calculating unit 290. That is, the inertial driving distance calculation unit 295 may calculate the distance that the control vehicle can move using the inertial driving in the current driving environment. In addition, the inertial driving distance calculation unit 295 may transmit the calculated inertial driving distance to the main controller 140.

Here, the inertial driving determination unit 130 is described as calculating the inertial driving distance ignoring the resistance of the air, the inertial driving determination unit 130 may calculate the inertial driving distance in consideration of the resistance of the air. In this case, the inertial driving determination unit 130 may further include an air resistance detection unit (not shown).

Referring back to FIG. 1, the main controller 140 determines whether the control vehicle can be braked without contact with the preceding vehicle only by inertia driving. That is, the main controller 140 compares the control vehicle target distance and the inertia driving distance input from the target distance calculator 120 to determine whether the inertia driving can be braked without contact with the preceding vehicle. For example, if the control vehicle target distance is greater than the inertial driving distance, the main controller 140 may determine that the control vehicle can be braked without contact with the preceding vehicle only by inertia driving. On the other hand, if the control vehicle target distance is less than or equal to the inertial driving distance, the main controller 140 may determine that the control vehicle cannot be braked without contact with the preceding vehicle only by inertia driving.

In addition, if it is determined that the control vehicle can be braked without contact with the preceding vehicle only by inertia driving, the main controller 140 may transmit inertial driving data to the display unit 150 to inform the driver of the control vehicle. In this case, the display unit 150 may display when the inertial driving possible data is received, so that the driver of the control vehicle may recognize that the control vehicle may be braked only by inertia driving.

On the other hand, if it is determined that the control vehicle cannot be braked without contact with the preceding vehicle only by inertia driving, the main controller 140 does not transmit the inertial driving data to the display unit 180 or displays the inertial driving impossible data. ) Can be sent. In this case, the display unit 150 may display when the inertial driving possible data is received so that the driver of the control vehicle may recognize that the control vehicle cannot be braked only by inertia driving.

The display unit 150 displays inertial driving data (or inertial driving impossible data) received from the main controller 140 to allow the driver of the control vehicle to recognize that the control vehicle can be braked only by inertia driving. . Here, the display unit 150 may be an image display unit that allows the driver of the control vehicle to visually recognize whether the inertia can travel. Accordingly, the display unit 150 may include an LCD panel and / or a PDP panel.

In addition, although not shown, the display unit 150 may further include a speaker that allows the driver of the control vehicle to acoustically recognize whether the inertia can travel. Accordingly, the inertial driveable data (or inertial drive impossible data) may include image data and audio data, and the display unit 150 may visually and / or acoustically display the inertial driveable data received from the main controller 140. Can be displayed as

3 is a flowchart illustrating an inertial driving induction method according to the present invention.

Hereinafter, the inertial driving induction method according to the present invention with reference to FIG. Here, each of the steps to be described below may be a step performed by each component included in the inertial driving guidance system 100 described with reference to FIGS. 1 and 2, but the inertial driving induction for convenience of understanding and explanation. It will be described collectively as being performed in system 100. Thus, the subject performing the steps to be described below may be omitted in some cases. Also, since the inertial driving induction system 100 may not operate when the power is turned off by the driver of the control vehicle, it is assumed here that the power of the inertial driving induction system 100 is normally turned on. Explain.

In step 310, the inertial driving guidance system 310 calculates the control vehicle target distance by generating the inter-vehicle distance data with the preceding vehicle. Here, the inter-vehicle distance data may be data including one or more of a relative distance value, a relative speed value, and / or a relative acceleration value, and the control vehicle target distance may include a control vehicle and an preceding vehicle equipped with the inertial driving guidance system 100. It may be information about the distance to the.

In step 320, the inertial driving guidance system 310 calculates inertial driving data. Here, the inertial driving data is data for calculating the inertial driving acceleration, wheel speed, brake gain (KB), horizontal axis force, vertical axis force, friction coefficient between road surface and tire, tire companion diameter, wheel angular velocity, control vehicle speed, A slip rate, a slip slope, a maximum friction coefficient, and the like in each wheel may be included.

In step 330, the inertial driving guidance system 310 calculates the inertial driving acceleration using the calculated inertial driving data. Here, the inertial driving acceleration is the acceleration of the control vehicle calculated using the calculated inertial driving data.

In step 340, the inertial driving guidance system 310 calculates the inertial driving distance using the calculated inertial driving acceleration and the control vehicle speed. Here, the inertial driving distance is a distance that the control vehicle can travel only by inertia by measuring the driving environment of the control vehicle.

In operation 350, the inertial driving guidance system 310 compares the control vehicle target distance with the inertial driving distance.

As a result of the comparison in step 350, if the control vehicle target distance is larger than the inertial driving distance, the inertial driving guidance system 310 may generate the inertial driving possible data to inform the driver of the controlling vehicle that the control vehicle can be braked only by the inertial driving. Display (step 360).

On the other hand, when the comparison result in step 350, the control vehicle target distance is less than the inertial driving distance, the inertial driving guidance system 310 to drive the inertial driving to inform the driver of the control vehicle that the control vehicle can not be braked only by the inertial driving The possible data are not displayed or the inertial data cannot be displayed (step 370).

By the inertial driving induction method described above, the driver of the control vehicle can determine whether the control vehicle can be braked only by inertia driving. In addition, the method of calculating the control vehicle target distance, inertial driving data, inertial driving acceleration and / or inertial driving distance may be the same as or similar to the method described above with reference to FIGS. 1 and 2. May be omitted.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art that various modifications of the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below It will be appreciated that modifications and variations can be made.

1 is a block diagram of an inertial driving guidance system according to the present invention.

Figure 2 is a block diagram of the inertial driving determination unit according to the present invention.

Figure 3 is a flow chart for the inertial driving induction method according to the present invention.

<Description of the symbols for the main parts of the drawings>

110: radar sensor unit

120: target distance calculation unit

130: inertial driving judgment unit

140: main control unit

 150: display unit

Claims (7)

A radar sensor unit generating inter-vehicle distance data for the preceding vehicle; A target distance calculator for calculating a control vehicle target distance using the inter-vehicle distance data; An inertial driving determination unit configured to calculate inertial driving data and calculate an inertial driving distance using the inertial driving data; And Inertial driving guidance system including a main control unit for controlling to display the inertial driving possible data when the control vehicle target distance is greater than the inertial driving distance. The inertial driving induction system of claim 1, wherein the inter-vehicle distance data includes at least one of a relative distance value, a relative speed value, and a relative acceleration value. According to claim 1, The inertial driving data is wheel speed, brake gain (KB), horizontal axis action force, vertical axis action force, friction coefficient between the road surface and the tire, tire accompanying diameter, wheel angular velocity, control vehicle speed, slip ratio, slip slope And at least one of a slip slope and a maximum friction coefficient. In the inertial driving induction method performed in the inertial driving induction system mounted on the control vehicle, Generating inter-vehicle distance data for the preceding vehicle; Calculating a control vehicle target distance using the inter-vehicle distance data; Calculating inertial driving data and calculating an inertial driving distance using the inertial driving data; And And controlling the inertial driving possible data to be displayed if the control vehicle target distance is larger than the inertial driving distance. The method of claim 4, wherein the inter-vehicle distance data includes at least one of a relative distance value, a relative speed value, and a relative acceleration value. According to claim 4, wherein the inertial driving data is wheel speed, brake gain (KB), horizontal axis action force, vertical axis action force, friction coefficient between the road surface and the tire, accompanying diameter of the tire, wheel angular velocity, control vehicle speed, slip ratio, slip slope And at least one of a slip slope and a maximum friction coefficient. A program of instructions that can be executed by the inertial driving induction system is tangibly implemented in order to perform the inertial driving induction method according to any one of claims 4 to 6, and is to be read by the inertial driving induction system. The recording medium on which the program can be recorded.

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