WO2012140721A1 - 車両制御装置及び車両制御方法 - Google Patents
車両制御装置及び車両制御方法 Download PDFInfo
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- WO2012140721A1 WO2012140721A1 PCT/JP2011/059023 JP2011059023W WO2012140721A1 WO 2012140721 A1 WO2012140721 A1 WO 2012140721A1 JP 2011059023 W JP2011059023 W JP 2011059023W WO 2012140721 A1 WO2012140721 A1 WO 2012140721A1
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- 238000000034 method Methods 0.000 title claims description 37
- 230000001133 acceleration Effects 0.000 claims abstract description 429
- 230000000977 initiatory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 33
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- 230000007704 transition Effects 0.000 description 16
- 238000004891 communication Methods 0.000 description 5
- 230000012447 hatching Effects 0.000 description 4
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- 230000006870 function Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/16—Anti-collision systems
- G08G1/161—Decentralised systems, e.g. inter-vehicle communication
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/14—Adaptive cruise control
- B60W30/16—Control of distance between vehicles, e.g. keeping a distance to preceding vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/14—Adaptive cruise control
- B60W30/16—Control of distance between vehicles, e.g. keeping a distance to preceding vehicle
- B60W30/17—Control of distance between vehicles, e.g. keeping a distance to preceding vehicle with provision for special action when the preceding vehicle comes to a halt, e.g. stop and go
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/16—Anti-collision systems
- G08G1/166—Anti-collision systems for active traffic, e.g. moving vehicles, pedestrians, bikes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W2050/0062—Adapting control system settings
- B60W2050/007—Switching between manual and automatic parameter input, and vice versa
- B60W2050/0071—Controller overrides driver automatically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W2050/0062—Adapting control system settings
- B60W2050/0075—Automatic parameter input, automatic initialising or calibrating means
- B60W2050/0095—Automatic control mode change
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
- B60W2520/105—Longitudinal acceleration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2554/00—Input parameters relating to objects
- B60W2554/80—Spatial relation or speed relative to objects
- B60W2554/801—Lateral distance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2554/00—Input parameters relating to objects
- B60W2554/80—Spatial relation or speed relative to objects
- B60W2554/804—Relative longitudinal speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2720/00—Output or target parameters relating to overall vehicle dynamics
- B60W2720/10—Longitudinal speed
- B60W2720/106—Longitudinal acceleration
Definitions
- the present invention relates to a vehicle control device and a vehicle control method for controlling a host vehicle according to a relative positional relationship between the host vehicle and an object around the host vehicle.
- a collision avoidance device that calculates a predicted value of the possibility of collision from the inter-vehicle distance between the host vehicle and the preceding vehicle and the host vehicle speed, and outputs an alarm when the calculated predicted value is equal to or greater than a predetermined threshold.
- the collision avoidance device determines whether or not the driver of the host vehicle has an intention to accelerate based on the acceleration of the host vehicle. Is increased to make it difficult to output an alarm. Further, the collision avoidance device determines whether or not the behavior of the preceding vehicle is abnormal based on the acceleration of the preceding vehicle. If it is determined that the behavior is abnormal, the collision avoidance device depends on the acceleration of the preceding vehicle. The predicted value is increased or corrected, or the threshold value is decreased and the warning is easily output.
- a vehicle control device that calculates a control value from the inter-vehicle distance between the host vehicle and the preceding vehicle, relative speed, relative acceleration, and host vehicle speed, and outputs an alarm when the calculated control value is equal to or greater than a predetermined threshold value. It is known (for example, refer to Patent Documents 2 and 3). These vehicle control devices calculate the control value using the acceleration of the preceding vehicle instead of the relative acceleration when the preceding vehicle decelerates relative to the own vehicle, regardless of the operation of the driver of the own vehicle. The changing acceleration of the preceding vehicle is independently reflected in the determination of the alarm output timing.
- the inter-vehicle distance between the host vehicle and the preceding vehicle is based on the relative speed, the host vehicle speed, the host vehicle acceleration, and the certainty of the driver's intention to follow the vehicle by reducing the inter-vehicle distance.
- an in-vehicle device that outputs an alarm when the distance is smaller than the calculated distance (see, for example, Patent Document 4).
- the certainty factor is calculated based on standard deviations of the inter-vehicle distance, the relative speed, and the relative acceleration in a predetermined period. This in-vehicle device reduces the calculated distance and makes it difficult to output an alarm when the driver of the vehicle has a willingness to follow the distance between the vehicles (if the confidence level is high). ing.
- the collision avoidance device disclosed in Patent Document 1 can calculate the predicted value independently of the magnitude of the acceleration of the host vehicle or the preceding vehicle even when it is determined that the driver of the host vehicle has an intention to accelerate. There is no reflection. Moreover, even if it is a case where the collision avoidance device of patent document 1 determines that the behavior of the preceding vehicle is abnormal based on the acceleration of the preceding vehicle, it calculates the predicted value independently of the magnitude of the acceleration of the own vehicle. Will not be reflected.
- the vehicle control devices of Patent Documents 2 and 3 calculate the control value in consideration of the acceleration of the preceding vehicle. It is not reflected in the calculation of the control value.
- the in-vehicle device disclosed in Patent Document 4 has the intention of the driver of the host vehicle to follow the vehicle with a shorter distance when the relative positional relationship (for example, relative acceleration) between the host vehicle and the preceding vehicle is small. It is determined that the vehicle has the alarm, and the alarm is not easily output, and the magnitude of the acceleration of the host vehicle or the preceding vehicle is not independently reflected in the determination of the alarm timing.
- the relative positional relationship for example, relative acceleration
- the present invention exists in the host vehicle and the vicinity of the host vehicle in determining the start timing of the predetermined driving assistance determined in accordance with the relative positional relationship between the host vehicle and an object around the host vehicle. It is an object of the present invention to provide a vehicle control device and a vehicle control method that reflect each acceleration of an object individually and determine the start timing more appropriately.
- a vehicle control apparatus starts a predetermined driving support in accordance with a relative positional relationship between the host vehicle and an object around the host vehicle.
- the acceleration obtained based on at least one of the distance between the host vehicle and the object, the speed of the host vehicle, the relative speed of the object with respect to the host vehicle, the acceleration of the host vehicle, and the acceleration of the object.
- a control value calculation unit that calculates a control value based on the related value, and a contribution degree of at least one of the acceleration of the host vehicle and the acceleration of the object in the acceleration related value according to the magnitude of the acceleration of the host vehicle.
- An acceleration-related value adjusting unit that adjusts the acceleration-related value by changing, a driving support start determining unit that starts the predetermined driving support when the control value calculated by the control value calculating unit exceeds a predetermined threshold; The Characterized in that it obtain.
- a vehicle control method is a vehicle control method for starting predetermined driving assistance according to a relative positional relationship between the host vehicle and an object around the host vehicle. Based on the distance to the object, the speed of the own vehicle, the relative speed of the object with respect to the own vehicle, and the acceleration-related value obtained based on at least one of the acceleration of the own vehicle and the acceleration of the object
- a control value calculating step for calculating a control value; and at least one of the acceleration of the host vehicle and the acceleration of the object in the acceleration related value is changed in accordance with the magnitude of the acceleration of the host vehicle.
- the present invention enables the vehicle and the object in the vicinity of the vehicle to determine the start timing of the predetermined driving assistance determined in accordance with the relative positional relationship between the vehicle and the object in the vicinity of the vehicle.
- a vehicle control device and a vehicle control method that reflect each acceleration individually and determine the start timing more appropriately.
- FIG. 5 is a diagram (No. 1) showing a relationship between the host vehicle and a preceding vehicle when the acceleration of the host vehicle is zero or more.
- FIG. 10 is a diagram (No. 2) showing a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more.
- FIG. 10 is a diagram (No. 3) illustrating the relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is greater than or equal to zero.
- FIG. 14 is a diagram (No.
- FIG. 11 is a diagram (No. 5) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more.
- FIG. 11 is a diagram (No. 6) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more.
- FIG. 11 is a diagram (No. 7) illustrating a relationship between the host vehicle and a preceding vehicle when the acceleration of the host vehicle is greater than or equal to zero.
- FIG. 10 is a diagram (No. 8) illustrating the relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is greater than or equal to zero.
- FIG. 19 is a diagram (No. 9) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is greater than or equal to zero.
- FIG. 10 is a diagram (No. 10) illustrating a relationship between the host vehicle and a preceding vehicle when the acceleration of the host vehicle is equal to or greater than zero.
- FIG. 3 is a diagram (part 1) illustrating a relationship between the host vehicle and a preceding vehicle when the acceleration of the host vehicle is less than zero.
- FIG. 10 is a diagram (part 2) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is less than zero.
- FIG. 11 is a diagram (No. 3) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is less than zero.
- FIG. 14 is a diagram (No. 4) illustrating the relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is less than zero.
- FIG. 11 is a diagram (No. 5) illustrating a relationship between the host vehicle and a preceding vehicle when the acceleration of the host vehicle is less than zero.
- FIG. 11 is a diagram (No. 6) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is less than zero.
- FIG. 10 is a diagram (No. 7) illustrating the relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is less than zero. It is a figure which shows an example of transition of the control value calculated by the driving assistance start determination process of FIG.
- FIG. 10 is a diagram (No. 1) showing a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more and the acceleration of the preceding vehicle is zero or more.
- FIG. 6 is a diagram (No. 2) showing a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more and the acceleration of the preceding vehicle is zero or more.
- FIG. 11 is a diagram (No. 3) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more and the acceleration of the preceding vehicle is zero or more.
- FIG. 14 is a diagram (No.).
- FIG. 11 is a diagram (No. 5) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more and the acceleration of the preceding vehicle is zero or more.
- FIG. 11 is a diagram (No. 6) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more and the acceleration of the preceding vehicle is zero or more.
- FIG. 6 is a diagram (part 1) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is zero or more and the acceleration of the preceding vehicle is less than zero.
- FIG. 10 is a diagram (part 2) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is greater than or equal to zero and the acceleration of the preceding vehicle is less than zero.
- FIG. 10 is a diagram (No. 3) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is equal to or greater than zero and the acceleration of the preceding vehicle is less than zero.
- FIG. 11 is a diagram (No. 4) illustrating a relationship between the host vehicle and the preceding vehicle when the acceleration of the host vehicle is equal to or greater than zero and the acceleration of the preceding vehicle is less than zero. It is a figure which shows an example of transition of the control value calculated by the driving assistance start determination process of FIG.
- FIG. 1 is a functional block diagram illustrating a configuration example of a vehicle control device 100 according to an embodiment of the present invention.
- the vehicle control device 100 is a device mounted on a vehicle on which the driver is boarded (hereinafter simply referred to as “own vehicle”), and mainly includes a control device 1, a vehicle state detection sensor 2, and an obstacle detection sensor 3. And the driving support device 4.
- the vehicle control device 100 is a device that controls a vehicle using a physical quantity representing a relative positional relationship between the host vehicle and an object existing around the host vehicle as an input value. For example, the host vehicle travels in front of the host vehicle. This is a rear-end collision warning device that outputs a warning when there is a risk of rear-end collision with the preceding vehicle.
- the control device 1 is a computer including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. For example, a control value calculation unit 10 and an acceleration-related value adjustment unit 11 described later. And the program corresponding to each function element of the driving assistance start determination part 12 is read from ROM, expand
- ROM Read Only Memory
- the vehicle state detection sensor 2 is a device for detecting the state of the vehicle.
- the vehicle state detection sensor 2 is connected to the control device 1 and detects or calculates a vehicle state such as speed, acceleration, yaw rate, steering angle, and steering torque of the host vehicle. Is output to the control device 1.
- the vehicle state detection sensor 2 is a wheel speed sensor attached to each wheel of the host vehicle, for example, and outputs the wheel speed of each wheel to the control device 1.
- the control device 1 calculates the speed Vm [m / s] of the host vehicle and the acceleration Am [m / s 2 ] of the host vehicle based on the wheel speed of each wheel output from the vehicle state detection sensor 2.
- the vehicle state detection sensor 2 is not limited to a wheel speed sensor, and is a rotating body on a power transmission path that transmits power generated by a power source (for example, an engine, a motor, etc.) of the host vehicle to driving wheels.
- a position sensor such as a rotation sensor that detects the number of rotations of the vehicle or a GPS (Global Positioning System) that detects position data of the host vehicle may be used.
- the obstacle detection sensor 3 is a device for detecting an object existing around the own vehicle, and is connected to the control device 1 and has an obstacle such as a relative distance, a relative speed, a relative acceleration, and a lateral position of the obstacle with respect to the own vehicle.
- the detected value or calculated value related to the object is output to the control device 1.
- the obstacle detection sensor 3 is, for example, a millimeter wave radar that detects the distance between the host vehicle and an object existing around the host vehicle, and the inter-vehicle distance D between the host vehicle and the preceding vehicle. [M] is detected.
- the millimeter wave radar is attached to, for example, a front central portion of the host vehicle, for example, in a front grille, emits a millimeter wave from a front surface of the host vehicle in a predetermined angle range in a traveling direction, and receives a millimeter wave reflected by a preceding vehicle. .
- the millimeter wave radar calculates the inter-vehicle distance D [m] between the host vehicle and the preceding vehicle by measuring the time from emission to reception, and outputs the calculated value to the control device 1. .
- the control device 1 calculates the relative speed Vr [m / s] and the relative acceleration Ar [m / s 2 ] of the preceding vehicle with respect to the host vehicle based on the inter-vehicle distance D [m] output from the obstacle detection sensor 3. To do. In addition, the control device 1 may calculate the relative acceleration Ar [m / s 2 ] based on the relative speed Vr [m / s] output by the obstacle detection sensor 3. Further, the control device 1 uses the speed Vm [m / s] and acceleration Am [m / s 2 ] of the host vehicle acquired or calculated based on the output of the vehicle state detection sensor 2 and the output of the obstacle detection sensor 3.
- the speed Vp [m / s] and acceleration Ap [m / s 2 ] of the preceding vehicle are calculated based on the relative speed Vr [m / s] and the relative acceleration Ar [m / s 2 ] acquired or calculated based on To do.
- the obstacle detection sensor 3 is not limited to the millimeter wave radar, and may be a radar using, for example, a laser or an infrared ray.
- the obstacle detection sensor 3 calculates an inter-vehicle distance D [m] and a relative speed Vr [m / s] based on image data obtained by imaging the traveling direction of the host vehicle with an imaging device such as a CCD camera. It may be.
- the obstacle detection sensor 3 acquires the inter-vehicle distance D [m] between the host vehicle and the preceding vehicle using communication such as inter-vehicle communication, road-to-vehicle communication, vehicle-to-vehicle communication, road-to-people communication, and the like. It may be.
- the driving support device 4 is a device that performs driving support in accordance with a control signal output from the control device 1. For example, a buzzer that outputs an alarm, a display device that displays a warning message, a reduction device that automatically controls a brake, and the like. It is.
- the control value calculation unit 10 is a functional element for calculating the control value CV used for determining the operation start of the driving support device 4.
- the control value CV is a value calculated based on the speed Vm of the own vehicle, the relative speed Vr of the preceding vehicle with respect to the own vehicle, the acceleration Am of the own vehicle, the speed Vp of the preceding vehicle, the acceleration Ap of the preceding vehicle, and the inter-vehicle distance D. For example, it is represented by the following formula (1).
- ⁇ , ⁇ , and ⁇ are constants having positive values.
- f (D) is a function of the inter-vehicle distance D and is a value that increases as the inter-vehicle distance D increases.
- Ax is a value calculated based on the acceleration Am of the host vehicle and the acceleration Ap of the preceding vehicle (hereinafter referred to as “acceleration related value”).
- Acceleration related value Ax is represented by the following formula (2), for example.
- a and b are weighting factors of the acceleration Ap of the preceding vehicle and the acceleration Am of the host vehicle.
- the acceleration-related value Ax may be set to either the acceleration Ap of the preceding vehicle or the relative acceleration Ar of the preceding vehicle with respect to the host vehicle without using the weighting factors a and b.
- the acceleration related value adjustment unit 11 is a functional element for adjusting the acceleration related value Ax.
- the weighting coefficients a and b are set according to the magnitude of at least one of the acceleration Am of the host vehicle and the acceleration Ap of the preceding vehicle. adjust.
- the acceleration-related value adjustment unit 11 reduces the weighting factor b of the acceleration Am of the own vehicle when the acceleration Am of the own vehicle is equal to or greater than a predetermined value (for example, zero), and the acceleration-related value.
- a predetermined value for example, zero
- the acceleration related value Ax is more easily affected by the acceleration Ap of the preceding vehicle than the acceleration Am of the host vehicle.
- the driving support start determination unit 12 is a functional element for determining the operation start of the driving support device 4. For example, the driving support start determination unit 12 compares the control value CV calculated by the control value calculation unit 10 with a predetermined threshold TH, and determines that the control value CV is equal to or greater than the threshold TH, the driving support device 4. A control signal is output. The driving support device 4 that has received the control signal from the driving support start determination unit 12 starts driving support.
- the threshold value TH is a value set in advance, and may be set for each driver, for example, and is set for each driving environment such as traveling on an expressway, traveling on a general road, traveling at night, or traveling in rainy weather. May be.
- FIG. 2 is a flowchart illustrating an example of the driving support start determination process, and the control device 1 repeatedly executes the driving support start determination process at a predetermined period.
- control device 1 is an obstacle to be processed based on the output of the obstacle detection sensor 3 (for example, a preceding vehicle at the closest position among preceding vehicles existing within a predetermined range in front of the host vehicle. )) Is already selected.
- control device 1 determines whether or not the acceleration Am of the host vehicle is greater than or equal to zero (step S1). This is to determine whether the host vehicle is accelerating.
- the control device 1 sets the weighting factor b of the acceleration Am of the host vehicle to the value “0” by the acceleration related value adjustment unit 11. The contribution of the acceleration Am of the host vehicle in the acceleration related value Ax is excluded. Further, the control device 1 sets the weighting coefficient a of the acceleration Ap of the preceding vehicle to the value “1”. As a result, the acceleration related value Ax becomes the acceleration Ap of the preceding vehicle. Note that the control device 1 may simply adopt the acceleration Ap of the preceding vehicle as the acceleration-related value Ax without using the weighting coefficients a and b.
- control device 1 calculates the control value CV by the control value calculation unit 10 (step S2).
- control value CV is expressed by the following equation (3).
- the control device 1 causes the acceleration related value adjustment unit 11 to determine the weighting factor a of the acceleration Ap of the preceding vehicle and the host vehicle.
- the weighting factor b of the acceleration Am is set to the value “1”.
- the acceleration related value Ax becomes the relative acceleration Ar of the preceding vehicle with respect to the host vehicle.
- the control device 1 may simply adopt the relative acceleration Ar of the preceding vehicle with respect to the host vehicle as the acceleration-related value Ax without using the weighting factors a and b.
- control device 1 calculates the control value CV by the control value calculation unit 10 (step S3).
- control value CV is expressed by the following equation (4).
- the control device 1 compares the control value CV calculated in step S2 or step S3 with the threshold value TH by the driving support start determination unit 12 (step S4).
- the control device 1 determines that the control value CV exceeds the threshold value TH (YES in step S4)
- the control device 1 outputs a control signal to the driving support device 4 (for example, a buzzer), which may cause a rear-end collision. If there is, an alarm is output (step S5).
- the control device 1 determines that the control value CV is equal to or less than the threshold value TH (NO in step S4), the control device 1 performs the driving support start determination process without outputting a control signal to the driving support device 4. Terminate.
- 3A to 3J are diagrams showing the relationship between the host vehicle and the preceding vehicle when the acceleration Am of the host vehicle is zero or more.
- 3A to 3J arrows represented by horizontal stripes, diagonal lines, and black hatching indicate the directions and sizes of the acceleration Ap of the preceding vehicle, the acceleration Am of the host vehicle, and the relative acceleration Ar.
- An unillustrated arrow indicates that the corresponding acceleration is zero.
- the acceleration value is a positive value when accelerating and a negative value when decelerating.
- FIGS. 3H to 3J show a case where the acceleration Am of the own vehicle exceeds zero
- FIGS. 3H to 3J show a case where the acceleration Am of the own vehicle is zero
- 3A shows a case where the absolute value of the acceleration Ap (negative value) of the preceding vehicle is smaller than the absolute value of the acceleration Am (positive value) of the host vehicle
- FIG. 3B shows the acceleration Ap (negative value) of the preceding vehicle
- FIG. 3C shows the case where the absolute value is larger than the absolute value of the acceleration Am (positive value) of the host vehicle
- FIG. 3C shows the absolute value of the acceleration Ap (negative value) of the preceding vehicle and the absolute value of the acceleration Am (positive value) of the host vehicle.
- FIG. 3C shows the case where the absolute value is larger than the absolute value of the acceleration Am (positive value) of the host vehicle
- FIG. 3C shows the absolute value of the acceleration Ap (negative value) of the preceding vehicle and the absolute value of the acceleration Am (positive value) of the host vehicle.
- 3D shows a case where the acceleration Ap of the preceding vehicle is zero.
- 3E shows a case where the absolute value of the acceleration Ap (positive value) of the preceding vehicle is smaller than the absolute value of the acceleration Am (positive value) of the host vehicle, and
- FIG. 3F shows the acceleration Ap (positive value) of the preceding vehicle.
- FIG. 3G shows a case where the absolute value of the acceleration Am (positive value) of the host vehicle is larger than the absolute value of the acceleration Am (positive value) of the host vehicle.
- 3H shows a case where the acceleration Ap of the preceding vehicle is zero
- FIG. 3I shows a case where the acceleration Ap of the preceding vehicle has a negative value
- FIG. 3J shows a case where the acceleration Ap of the preceding vehicle has a positive value.
- the acceleration Ap of the preceding vehicle is always greater than or equal to the relative acceleration Ar.
- the increase in the acceleration related value Ax (the acceleration Ap of the preceding vehicle is used instead of the relative acceleration Ar as the acceleration related value Ax) means a decrease in the value of the numerator in the equation (3). Therefore, the control value CV calculated using the acceleration Ap of the preceding vehicle according to the expression (3) is smaller than the control value CV calculated using the relative acceleration Ar according to the expression (4).
- the decrease in the control value CV means that the control value CV is difficult to exceed the threshold value TH.
- the control device 1 calculates the control value CV using the acceleration Ap of the preceding vehicle according to the equation (3), thereby calculating the relative acceleration according to the equation (4). Compared to the case where the control value CV is calculated using Ar, the control value CV is less likely to exceed the threshold value TH.
- the control device 1 determines that the relative acceleration Ar is determined when the host vehicle is accelerating, that is, when it is determined that the driver of the host vehicle is intentionally accelerating and the possibility of rough driving is low.
- the state of the vehicle control device 100 is set to a state in which an alarm is not easily output. This control is based on the view that, when the host vehicle is accelerating, calculating the control value CV with the acceleration Ap of the preceding vehicle more important than the relative acceleration Ar matches the driver's feeling.
- the control device 1 calculates the control value CV with an emphasis on the relative acceleration Ar, that is, the control value CV is calculated in consideration of the acceleration of the host vehicle excessively. Therefore, it is possible to prevent the warning from being output at an early stage.
- the acceleration Am of the host vehicle is less than zero
- the control value CV is calculated using the relative acceleration Ar from the equation (4), rather than the case where the control value CV is calculated using the acceleration Ap of the preceding vehicle according to the equation (3). The case is smaller.
- the reason will be described with reference to FIGS. 4A to 4G.
- 4A to 4G are diagrams showing the relationship between the host vehicle and the preceding vehicle when the acceleration Am of the host vehicle is less than zero.
- 4A to 4G arrows represented by horizontal stripes, diagonal lines, and black hatching indicate the acceleration Ap of the preceding vehicle, the acceleration Am of the host vehicle, and the relative acceleration Ar, respectively, as in the case of FIG. Represents orientation and size.
- An unillustrated arrow indicates that the corresponding acceleration is zero.
- the acceleration value is a positive value when accelerating and a negative value when decelerating.
- FIG. 4A shows a case where the absolute value of the acceleration Ap (negative value) of the preceding vehicle is smaller than the absolute value of the acceleration Am (negative value) of the host vehicle
- FIG. 4B shows the acceleration Ap (negative value) of the preceding vehicle
- FIG. 4C shows the case where the absolute value is larger than the absolute value of the acceleration Am (negative value) of the own vehicle
- FIG. 4C shows the absolute value of the acceleration Ap (negative value) of the preceding vehicle and the absolute value of the acceleration Am (negative value) of the own vehicle.
- FIG. 4D shows a case where the acceleration Ap of the preceding vehicle is zero.
- FIG. 4E shows a case where the absolute value of the acceleration Ap (positive value) of the preceding vehicle is smaller than the absolute value of the acceleration Am (negative value) of the own vehicle
- FIG. 4F shows the acceleration Ap (positive value) of the preceding vehicle
- FIG. 4G shows the case where the absolute value is larger than the absolute value of the acceleration Am (negative value) of the host vehicle
- FIG. 4G shows the absolute value of the acceleration Ap (positive value) of the preceding vehicle and the absolute value of the acceleration Am (negative value) of the host vehicle. Indicates the case where is equal.
- the acceleration Ap of the preceding vehicle is always less than the relative acceleration Ar.
- the increase in the acceleration related value Ax means a decrease in the numerator value in the equation (4). Therefore, the control value CV calculated using the relative acceleration Ar according to the equation (4) is smaller than the control value CV calculated using the acceleration Ap of the preceding vehicle according to the equation (3).
- the decrease in the control value CV means that the control value CV is difficult to exceed the threshold value TH.
- the control device 1 calculates the control value CV using the relative acceleration Ar according to the equation (4), thereby obtaining the acceleration of the preceding vehicle according to the equation (3). Compared to the case where the control value CV is calculated using Ap, the control value CV is less likely to exceed the threshold value TH.
- the control device 1 outputs an alarm indicating the state of the vehicle control device 100 as compared with the case where the control value CV is calculated with an emphasis on the acceleration Ap of the preceding vehicle. Make it difficult to do.
- This control is based on the view that when the host vehicle is decelerating, calculating the control value CV with the relative acceleration Ar more important than the acceleration Ap of the preceding vehicle matches the driver's feeling.
- the control device 1 calculates the control value CV with an emphasis on the acceleration Ap of the preceding vehicle, that is, the control value CV without considering the acceleration of the host vehicle. It is possible to prevent the calculation and the warning from being output at an early stage.
- the vertical axis is the control value CV
- the horizontal axis is the time axis
- the acceleration Am of the host vehicle is less than zero from the first state ST1 where the acceleration Am of the host vehicle is zero or more at time t1.
- the transition of the solid line indicates the transition of the control value CV calculated in the driving support start determination process of FIG. 2, and the transition of the broken line indicates the control value CV calculated using the acceleration Ap of the preceding vehicle by Expression (3).
- the transition of the one-dot chain line indicates the transition of the control value CV calculated by using the relative acceleration Ar according to the equation (4).
- the horizontal line (dotted line) in a figure represents the level of threshold value TH.
- the control value CV (solid line) calculated in the driving support start determination process in FIG. 2 is calculated using the acceleration Ap of the preceding vehicle in the first state ST1, using Equation (3).
- the second state ST2 it is calculated using the relative acceleration Ar according to the equation (4). Therefore, the control value CV (solid line) is less likely to exceed the threshold value TH in the first state ST1 than in the case where the control value CV (solid line) is calculated using the relative acceleration Ar according to the equation (4) (one-dot chain line). Further, the control value CV (solid line) is less likely to exceed the threshold value TH in the second state ST2 than in the case where the control value CV (solid line) is calculated using the acceleration Ap of the preceding vehicle by the equation (3) (broken line).
- the vehicle control device 100 issues an alarm when the host vehicle is accelerating, that is, when it is determined that the driver of the host vehicle is accelerating intentionally and the possibility of rough driving is low. Output at an early stage can be prevented.
- the vehicle control device 100 can prevent an alarm from being output early due to excessive reaction to the behavior of the preceding vehicle when the host vehicle is decelerating.
- FIG. 6 is a flowchart illustrating another example of the driving support start determination process, and the control device 1 repeatedly executes the driving support start determination process at a predetermined cycle.
- control device 1 is an obstacle to be processed based on the output of the obstacle detection sensor 3 (for example, a preceding vehicle at the closest position among preceding vehicles existing within a predetermined range in front of the host vehicle. )) Is already selected.
- control device 1 determines whether or not the acceleration Am of the host vehicle is greater than or equal to zero (step S11). This is to determine whether the host vehicle is accelerating.
- step S11 When it determines with the acceleration Am of the own vehicle being zero or more (YES of step S11), the control apparatus 1 determines whether the acceleration Ap of a preceding vehicle is zero or more (step S12).
- the control device 1 sets the weighting factor b of the acceleration Am of the host vehicle to the value “0” by the acceleration related value adjustment unit 11. The contribution of the acceleration Am of the host vehicle in the acceleration related value Ax is excluded. Further, the control device 1 sets the weighting coefficient a of the acceleration Ap of the preceding vehicle to the value “1”. As a result, the acceleration related value Ax becomes the acceleration Ap of the preceding vehicle. Note that the control device 1 may simply adopt the acceleration Ap of the preceding vehicle as the acceleration-related value Ax without using the weighting coefficients a and b.
- control device 1 calculates the control value CV by the control value calculation unit 10 (step S13).
- the control value CV is expressed by the above equation (3).
- the control device 1 causes the acceleration-related value adjustment unit 11 to weight the acceleration Ap of the preceding vehicle and the acceleration Am of the host vehicle.
- Each of a and b is set to a value “0”, and the contributions of the acceleration Ap of the preceding vehicle and the acceleration Am of the host vehicle in the acceleration-related value Ax are excluded. As a result, the acceleration related value Ax is zero. Note that the control device 1 may simply adopt the value zero as the acceleration related value Ax without using the weighting factors a and b.
- control device 1 calculates the control value CV by the control value calculation unit 10 (step S14).
- control value CV is expressed by the following formula (5).
- the control device 1 causes the acceleration related value adjustment unit 11 to determine the weighting factor a of the acceleration Ap of the preceding vehicle and the host vehicle.
- the weighting factor b of the acceleration Am is set to the value “1”.
- the acceleration related value Ax becomes the relative acceleration Ar of the preceding vehicle with respect to the host vehicle.
- the control device 1 may simply adopt the relative acceleration Ar of the preceding vehicle with respect to the host vehicle as the acceleration-related value Ax without using the weighting factors a and b.
- control device 1 calculates the control value CV by the control value calculation unit 10 (step S15).
- control value CV is expressed by the above equation (4).
- the control device 1 compares the control value CV calculated in step S13, step S14, or step S15 with the threshold value TH by the driving support start determination unit 12 (step S16).
- the control device 1 determines that the control value CV exceeds the threshold value TH (YES in step S16)
- the control device 1 outputs a control signal to the driving support device 4 (for example, a buzzer), which may cause a rear-end collision. If there is, an alarm is output (step S17).
- the control device 1 determines that the control value CV is equal to or less than the threshold value TH (NO in step S16)
- the control device 1 performs the driving support start determination process without outputting a control signal to the driving support device 4. Terminate. This is because it can be determined that there is no risk of a rear-end collision.
- the driving support start determination process described above determines whether or not the acceleration Am of the host vehicle is zero or more and then determines whether or not the acceleration Ap of the preceding vehicle is zero or more. The order is irrelevant, and both determinations may be made simultaneously. [When the acceleration Am of the host vehicle is zero or more and the acceleration Ap of the preceding vehicle is zero or more] If the acceleration Am of the subject vehicle is zero or more and the acceleration Ap of the preceding vehicle is zero or more, the control value CV is calculated using the acceleration Ap of the preceding vehicle according to the expression (3). The case where it calculates using Formula (5) becomes larger. Hereinafter, the reason will be described with reference to FIGS. 7A to 7F.
- 7A to 7F are diagrams showing the relationship between the host vehicle and the preceding vehicle when the acceleration Am of the host vehicle is zero or more and the acceleration Ap of the preceding vehicle is zero or more.
- 7A to 7F the arrows represented by horizontal stripes, diagonal lines, and black hatching indicate the acceleration Ap of the preceding vehicle, the acceleration Am of the host vehicle, and the relative acceleration Ar, as in FIGS. Represents the direction and size of each.
- An unillustrated arrow indicates that the corresponding acceleration is zero.
- the acceleration value is a positive value when accelerating and a negative value when decelerating.
- FIGS. 7E and 7F show a case where the acceleration Am of the host vehicle exceeds zero
- FIGS. 7E and 7F show a case where the acceleration Am of the host vehicle is zero
- 7A shows a case where the absolute value of the acceleration Ap (positive value) of the preceding vehicle is smaller than the absolute value of the acceleration Am (positive value) of the host vehicle
- FIG. 7B shows the acceleration Ap (positive value) of the preceding vehicle
- FIG. 7C shows the case where the absolute value of the acceleration Ap (positive value) of the preceding vehicle is the absolute value of the acceleration Am (positive value) of the host vehicle
- 7D shows a case where the acceleration Ap of the preceding vehicle is zero.
- FIG. 7E shows a case where the acceleration Am of the own vehicle and the acceleration Ap of the preceding vehicle are both zero
- FIG. 7F shows a case where the acceleration Am of the own vehicle is zero and the acceleration Ap of the preceding vehicle is a positive value. Indicates.
- the acceleration Ap of the preceding vehicle is always a value equal to or greater than the relative acceleration Ar, and is a positive value as long as the preceding vehicle is accelerating.
- the decrease in acceleration-related value Ax means an increase in the value of the numerator in equation (3).
- the control value CV calculated using Expression (5) is larger than the control value CV calculated using Expression (3) using the acceleration Ap of the preceding vehicle.
- the increase in the control value CV means that the control value CV easily exceeds the threshold value TH.
- the control device 1 calculates the control value CV using Expression (5), Compared with the case where the control value CV is calculated by using the acceleration Ap of the preceding vehicle according to the expression (3), the control value CV can easily exceed the threshold value TH.
- the driving support start determination process in FIG. 6 changes a part of the driving support start determination process in FIG.
- the control value CV is calculated with the acceleration Ap of the preceding vehicle more important than the relative acceleration Ar, and the state of the vehicle control device 100 is determined. Make the alarm difficult to output.
- the host vehicle and the preceding vehicle are accelerating, particularly when the host vehicle approaches the preceding vehicle as shown in FIG. 7A (for example, when the host vehicle overtakes the accelerating preceding vehicle).
- Another control may be desired.
- the alarm timing is determined by using the acceleration Ap of the preceding vehicle according to the expression (3), which is later than the alarm timing determined by using the relative acceleration Ar according to the expression (4) (driving in FIG. 2).
- the timing is not delayed until the timing determined by the support start determination process.
- the driving support start determination process of FIG. 6 basically determines the alarm timing based on the control value CV calculated using the equation (3) when the acceleration Am of the host vehicle is zero or more. .
- the alarm timing is exceptionally set based on the control value CV calculated using the equation (5). decide.
- the driving support start determination process in FIG. 6 is performed by calculating the control value CV using the equation (5) when the acceleration Am of the host vehicle is zero or more and the acceleration Ap of the preceding vehicle is more than.
- the control value CV may easily exceed the threshold value TH as compared with the case where the control value CV is calculated using the acceleration Ap of the preceding vehicle by the expression (3).
- the control apparatus 1 is in the case where the host vehicle is accelerating, that is, when the driver of the host vehicle is intentionally accelerating and it is determined that the possibility of rough driving is low
- the state of the vehicle control device 100 is more likely to output an alarm than when the control value CV is calculated using the acceleration Ap of the preceding vehicle according to Equation (3).
- this control is not affected by the acceleration Am of the host vehicle and the acceleration Ap of the preceding vehicle, and is not affected by the control value CV. This is based on the view that the calculation of the value matches the driver's feeling.
- the control device 1 determines the acceleration Ap of the preceding vehicle using Equation (3).
- the alarm may be output more easily than when the control value CV is used to calculate, and the alarm may be less likely to be output than when the control value CV is calculated using the relative acceleration Ar using Equation (4).
- the control value CV is expressed by the formula (4) rather than the case where the control value CV is calculated using the relative acceleration Ar by the formula (4). 3), the case where the calculation is performed using the acceleration Ap of the preceding vehicle is smaller.
- 8A to 8D are diagrams showing the relationship between the host vehicle and the preceding vehicle when the acceleration Am of the host vehicle is zero or more and the acceleration Ap of the preceding vehicle is less than zero.
- 8A to 8D the arrows represented by horizontal stripes, diagonal lines, and black hatching are the acceleration Ap of the preceding vehicle, the acceleration Am of the host vehicle, and the same as in the case of FIGS.
- size of relative acceleration Ar are represented.
- An unillustrated arrow indicates that the corresponding acceleration is zero.
- the acceleration value is a positive value when accelerating and a negative value when decelerating.
- FIG. 8A shows a case where the absolute value of the acceleration Ap (negative value) of the preceding vehicle is larger than the absolute value of the acceleration Am (positive value) of the host vehicle
- FIG. 8B shows the acceleration Ap (negative value) of the preceding vehicle
- FIG. 8C shows a case where the absolute value of the acceleration Am (positive value) of the host vehicle is equal to the absolute value of the acceleration Am (positive value) of the host vehicle
- FIG. 8D shows a case where the acceleration Am of the host vehicle is zero.
- the acceleration Ap of the preceding vehicle is always greater than or equal to the relative acceleration Ar.
- the increase in the acceleration related value Ax (the acceleration Ap of the preceding vehicle is used instead of the relative acceleration Ar as the acceleration related value Ax) means a decrease in the value of the numerator in the equation (3). Therefore, the control value CV calculated using the acceleration Ap of the preceding vehicle according to the expression (3) is smaller than the control value CV calculated using the relative acceleration Ar according to the expression (4).
- the decrease in the control value CV means that the control value CV is difficult to exceed the threshold value TH.
- the control device 1 uses the acceleration Ap of the preceding vehicle according to Expression (3) to obtain the control value CV.
- the control value CV is less likely to exceed the threshold value TH as compared with the case where the control value CV is calculated using the relative acceleration Ar according to the equation (4).
- the control device 1 is a case where the host vehicle is accelerating, that is, a case where the driver of the host vehicle is intentionally accelerating and it is determined that the possibility of a casual driving is low.
- the vehicle control device 100 is set in a state in which an alarm is less likely to be output than when the control value CV is calculated with the relative acceleration Ar as important.
- the control value CV is calculated by placing importance on the acceleration Ap of the preceding vehicle rather than the relative acceleration Ar. Is based on the view that it matches the driver's sense.
- control device 1 calculates the control value CV by placing importance on the relative acceleration Ar when the host vehicle is accelerating and the preceding vehicle is not accelerating. It is possible to prevent the control value CV from being calculated in consideration of the acceleration excessively and the warning from being output at an early stage.
- the acceleration Am of the host vehicle is less than zero
- the control value CV is calculated using the relative acceleration Ar from the equation (4), rather than the case where the control value CV is calculated using the acceleration Ap of the preceding vehicle according to the equation (3). The case is smaller. The reason is as described with reference to FIGS. 4A to 4G.
- the acceleration Ap of the preceding vehicle is always less than the relative acceleration Ar.
- the increase in the acceleration related value Ax means a decrease in the numerator value in the equation (4). Therefore, the control value CV calculated using the relative acceleration Ar according to the equation (4) is smaller than the control value CV calculated using the acceleration Ap of the preceding vehicle according to the equation (3).
- the decrease in the control value CV means that the control value CV is difficult to exceed the threshold value TH.
- the control device 1 calculates the control value CV using the relative acceleration Ar according to the equation (4), thereby obtaining the acceleration of the preceding vehicle according to the equation (3). Compared to the case where the control value CV is calculated using Ap, the control value CV is less likely to exceed the threshold value TH.
- the control device 1 outputs an alarm indicating the state of the vehicle control device 100 as compared with the case where the control value CV is calculated with an emphasis on the acceleration Ap of the preceding vehicle. Make it difficult to do.
- This control is based on the view that when the host vehicle is decelerating, calculating the control value CV with the relative acceleration Ar more important than the acceleration Ap of the preceding vehicle matches the driver's feeling.
- control device 1 calculates the control value CV by focusing on the acceleration Ap of the preceding vehicle, that is, without considering the acceleration of the host vehicle. By doing so, it is possible to prevent the warning from being output at an early stage.
- transition of control value CV calculated in the driving support start determination process of FIG. 6 will be described with reference to FIG.
- the vertical axis represents the control value CV
- the horizontal axis represents the time axis.
- FIG. 9 shows that at time t1, the acceleration Am of the host vehicle is zero or more from the first state ST1 in which the acceleration Am of the host vehicle is zero or more and the acceleration Ap of the preceding vehicle is zero or more. And it shows that the state of the vehicle is switched to the second state ST2 in which the acceleration Ap of the preceding vehicle is less than zero. Further, in FIG. 9, at time t2, the vehicle state is switched from the second state ST2 to the third state ST3 in which the acceleration Am of the host vehicle is less than zero and the acceleration Ap of the preceding vehicle is less than zero.
- the vehicle state is switched from the third state ST3 to the fourth state ST4 in which the acceleration Am of the host vehicle is less than zero and the acceleration Ap of the preceding vehicle is greater than or equal to zero.
- the transition of the solid line indicates the transition of the control value CV calculated in the driving support start determination process of FIG. 6, and the transition of the broken line indicates the control value CV calculated using the acceleration Ap of the preceding vehicle by Expression (3).
- the transition of the alternate long and short dash line indicates the transition of the control value CV calculated using the relative acceleration Ar by the equation (4).
- the horizontal line (dotted line) in a figure represents the level of threshold value TH.
- control value CV solid line
- the control value CV (solid line) calculated in the driving support start determination process of FIG. 6 is calculated using the value zero in the first state ST ⁇ b> 1 according to the equation (5), and the second state.
- the calculation is performed using the acceleration Ap of the preceding vehicle according to Expression (3), and is calculated using the relative acceleration Ar according to Expression (4) in the third state ST3 and the fourth state ST4.
- control value CV (solid line) is easier to exceed the threshold value TH in the first state ST1 than in the case where the control value CV is calculated using the acceleration Ap of the preceding vehicle by the equation (3) (broken line).
- the control value CV (solid line) is calculated using the acceleration Ap of the preceding vehicle by the equation (3) (broken line) and using the relative acceleration Ar by the equation (4).
- the threshold value TH is more easily exceeded than in any case (the one-dot chain line).
- the period R1 is a period in which the acceleration Ap of the preceding vehicle is larger than the acceleration Am of the own vehicle and the preceding vehicle moves away from the own vehicle.
- the control value CV (solid line) is more likely to exceed the threshold value TH when calculated using the acceleration Ap of the preceding vehicle by the equation (3) (broken line), and the relative acceleration Ar by the equation (4).
- the threshold TH is less likely to be exceeded than when calculated using (dotted line). Note that the period R2 is a period in which the acceleration Am of the host vehicle is larger than the acceleration Ap of the preceding vehicle and the host vehicle approaches the preceding vehicle.
- control value CV (solid line) is less likely to exceed the threshold value TH in the second state ST2 as compared to the case where the control value CV (solid line) is calculated using the relative acceleration Ar by the equation (4) (one-dot chain line).
- control value CV (solid line) is less likely to exceed the threshold value TH in the third state ST3 and the fourth state ST4 than in the case where the acceleration Ap of the preceding vehicle is calculated by the equation (3) (broken line). ing.
- the control value CV (broken line) calculated by using the acceleration Ap of the preceding vehicle by Equation (3) exceeds the threshold value TH, and an alarm is output early. Show.
- the vehicle control device 100 issues an alarm when the host vehicle is accelerating, that is, when it is determined that the driver of the host vehicle is accelerating intentionally and the possibility of rough driving is low. Output at an early stage can be prevented.
- the vehicle control device 100 can prevent the alarm timing from being delayed too much when the preceding vehicle is accelerating.
- the vehicle control device 100 can detect the alarm timing only when the preceding vehicle is accelerating and the magnitude of the acceleration is smaller than the magnitude of the acceleration of the own vehicle even when the own vehicle is accelerating. You can avoid delaying too much.
- the vehicle control device 100 can prevent the warning from being output early due to excessive reaction to the behavior of the preceding vehicle.
- the acceleration related value adjustment unit 11 sets the value “1” or the value “0” for the weighting coefficients a and b, but may set other real values.
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Abstract
Description
[自車両の加速度Amがゼロ以上の場合]
制御値CVは、自車両の加速度Amがゼロ以上であれば、式(4)により相対加速度Arを用いて算出される場合よりも、式(3)により先行車両の加速度Apを用いて算出される場合のほうが小さくなる。以下、図3A~図3Jを参照して、その理由を説明する。
[自車両の加速度Amがゼロ未満の場合]
制御値CVは、自車両の加速度Amがゼロ未満であれば、式(3)により先行車両の加速度Apを用いて算出される場合よりも、式(4)より相対加速度Arを用いて算出される場合のほうが小さくなる。以下、図4A~図4Gを参照して、その理由を説明する。
[図2の運転支援開始判定処理で算出される制御値CVの推移]
次に、図5を参照しながら、図2の運転支援開始判定処理で算出される制御値CVの推移について説明する。なお、図5は、縦軸を制御値CV、横軸を時間軸とし、時刻t1において、自車両の加速度Amがゼロ以上である第一状態ST1から、自車両の加速度Amがゼロ未満である第二状態ST2に車両の状態が切り替わることを示す。また、実線の推移は図2の運転支援開始判定処理で算出される制御値CVの推移を示し、破線の推移は式(3)により先行車両の加速度Apを用いて算出される制御値CVの推移を示し、一点鎖線の推移は式(4)により相対加速度Arを用いて算出される制御値CVの推移を示す。なお、図中の水平線(点線)は、閾値THのレベルを表す。
[自車両の加速度Amがゼロ以上、かつ、先行車両の加速度Apがゼロ以上の場合]
制御値CVは、自車両の加速度Amがゼロ以上であり、かつ、先行車両の加速度Apがゼロ以上であれば、式(3)により先行車両の加速度Apを用いて算出される場合よりも、式(5)を用いて算出される場合のほうが大きくなる。以下、図7A~図7Fを参照して、その理由を説明する。
[自車両の加速度Amがゼロ以上、かつ、先行車両の加速度Apがゼロ未満の場合]
制御値CVは、自車両の加速度Amがゼロ以上であり、かつ、先行車両の加速度Apがゼロ未満であれば、式(4)により相対加速度Arを用いて算出される場合よりも、式(3)により先行車両の加速度Apを用いて算出される場合のほうが小さくなる。以下、図8A~図8Dを参照して、その理由を説明する。
[自車両の加速度Amがゼロ未満の場合]
制御値CVは、自車両の加速度Amがゼロ未満であれば、式(3)により先行車両の加速度Apを用いて算出される場合よりも、式(4)より相対加速度Arを用いて算出される場合のほうが小さくなる。その理由は、図4A~図4Gを参照して説明したとおりである。
[図6の運転支援開始判定処理で算出される制御値CVの推移]
次に、図9を参照しながら、図6の運転支援開始判定処理で算出される制御値CVの推移について説明する。なお、図9は、縦軸を制御値CV、横軸を時間軸とする。
2 車両状態検出センサ
3 障害物検出センサ
4 運転支援装置
10 制御値算出部
11 加速度関連値調整部
12 運転支援開始判定部
100 車両制御装置
Am 自車両の加速度
Ap 先行車両の加速度
Ar 相対加速度
Ax 加速度関連値
CV 制御値
D 車間距離
TH 閾値
Vm 自車両の速度
Vp 先行車両の速度
Vr 相対速度
Claims (6)
- 自車両と自車両周辺にある物体との間の相対位置関係に応じて所定の運転支援を開始させる車両制御装置であって、
自車両と前記物体との間の距離と、自車両の速度と、自車両に対する前記物体の相対速度と、自車両の加速度及び前記物体の加速度の少なくとも一方に基づいて得られる加速度関連値と、に基づいて制御値を算出する制御値算出部と、
自車両の加速度の大きさに応じて、前記加速度関連値における自車両の加速度及び前記物体の加速度の少なくとも一方の寄与度を変化させて前記加速度関連値を調整する加速度関連値調整部と、
前記制御値算出部が算出した制御値が所定の閾値を上回る場合に前記所定の運転支援を開始させる運転支援開始判定部と、
を備えることを特徴とする車両制御装置。 - 前記加速度関連値調整部は、自車両の加速度が値ゼロ以上の場合に、前記加速度関連値として前記物体の加速度を用いる、
ことを特徴とする請求項1に記載の車両制御装置。 - 前記加速度関連値調整部は、自車両の加速度が値ゼロ未満の場合に、前記加速度関連値として自車両に対する前記物体の相対加速度を用いる、
ことを特徴とする請求項1に記載の車両制御装置。 - 前記加速度関連値調整部は、自車両の加速度が値ゼロ以上であり、かつ、前記物体の加速度が値ゼロ以上の場合に、前記加速度関連値として値ゼロを用いる、
ことを特徴とする請求項1に記載の車両制御装置。 - 前記加速度関連値調整部は、自車両の加速度が値ゼロ以上であり、かつ、前記物体の加速度が値ゼロ未満の場合に、前記加速度関連値として前記物体の加速度を用いる、
ことを特徴とする請求項1に記載の車両制御装置。 - 自車両と自車両周辺にある物体との間の相対位置関係に応じて所定の運転支援を開始させる車両制御方法であって、
自車両と前記物体との間の距離と、自車両の速度と、自車両に対する前記物体の相対速度と、自車両の加速度及び前記物体の加速度の少なくとも一方に基づいて得られる加速度関連値と、に基づいて制御値を算出する制御値算出ステップと、
自車両の加速度の大きさに応じて、前記加速度関連値における自車両の加速度及び前記物体の加速度の少なくとも一方の寄与度を変化させて前記加速度関連値を調整する加速度関連値調整ステップと、
前記制御値算出ステップにおいて算出された制御値が所定の閾値を上回る場合に前記所定の運転支援を開始させる運転支援開始判定ステップと、
を備えることを特徴とする車両制御方法。
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