WO2017145555A1 - 走行制御装置及び走行制御システム - Google Patents
走行制御装置及び走行制御システム Download PDFInfo
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- WO2017145555A1 WO2017145555A1 PCT/JP2017/000915 JP2017000915W WO2017145555A1 WO 2017145555 A1 WO2017145555 A1 WO 2017145555A1 JP 2017000915 W JP2017000915 W JP 2017000915W WO 2017145555 A1 WO2017145555 A1 WO 2017145555A1
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- start point
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- 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
- B60W30/10—Path keeping
- B60W30/12—Lane keeping
-
- 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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
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- 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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/20—Conjoint control of vehicle sub-units of different type or different function including control of steering systems
-
- 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
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18145—Cornering
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/02—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to ambient conditions
- B60W40/06—Road conditions
- B60W40/072—Curvature of the road
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0212—Control of position or course in two dimensions specially adapted to land vehicles with means for defining a desired trajectory
- G05D1/0223—Control of position or course in two dimensions specially adapted to land vehicles with means for defining a desired trajectory involving speed control of the vehicle
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- 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
- B60W2420/00—Indexing codes relating to the type of sensors based on the principle of their operation
- B60W2420/40—Photo, light or radio wave sensitive means, e.g. infrared sensors
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- 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
- B60W2420/00—Indexing codes relating to the type of sensors based on the principle of their operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W2552/20—Road profile, i.e. the change in elevation or curvature of a plurality of continuous road segments
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- 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
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- B60W2720/106—Longitudinal acceleration
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- 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
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- B60W2720/12—Lateral speed
- B60W2720/125—Lateral acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2013/9321—Velocity regulation, e.g. cruise control
Definitions
- the present invention relates to a traveling control device that controls traveling of an automobile.
- ADAS advanced driving support system
- automatic driving related technology in automobiles has been progressing rapidly in recent years.
- Adaptive cruise control, lane keep assist systems, emergency automatic brakes, etc. have come into practical use as functions for automating part of driving operations.
- Patent Document 1 As for the lateral motion, for example, Patent Document 1 is cited as a related prior art. Patent Document 1 discloses a method for performing a comfortable curve driving by performing a steering operation for tilting the vehicle body in accordance with the curvature from the steering start point to the curve start point. The case of traveling along a curve is not mentioned.
- Patent Document 2 proposes an acceleration / deceleration control method based on lateral jerk generated by steering.
- the lateral movement in Patent Document 2 is based on steering by a human driver.
- strict trajectory tracking control is not performed for a predetermined trajectory, and the lateral and longitudinal motions of the vehicle are always assumed while always assuming the approximate trajectory and acceleration / deceleration to be performed ahead. Are considered to be controlled simultaneously.
- the travel control device in the present application includes a lane shape detection unit that detects a lane shape of a curve, and a GG diagram that is a relationship between lateral acceleration and longitudinal acceleration based on the vehicle speed.
- GVC trajectory calculating means for calculating a traveling trajectory that satisfies a relationship that draws an arc shape
- a steering start point determination unit that determines a steering start point in front of the curve so that the traveling track obtained by the GVC track calculation means is within the lane detected by the lane shape detection unit.
- the acceleration vector changes in an arc shape
- FIG. 5B is a diagram showing the relationship. It is the figure which showed the transition of the magnitude
- FIG. 5 is a diagram showing a difference in steering start point between a vehicle (a) having a small vehicle width and a vehicle (b) having a large vehicle width in a lane having the same shape.
- a steering start point determination unit for applying a trajectory in consideration of acceleration / deceleration control for transitioning an acceleration vector in an arc shape in a real environment will be described as a steering start point determination device.
- a travel control device incorporating a method for determining the steering start point
- information necessary for determining the steering start point is input to the steering start point determination device, and steering is started at the determined steering start point, and at the same time acceleration / deceleration is performed.
- a mode including a mechanism for controlling will be described.
- Fig. 1 shows a part of a typical road shape including a curve section.
- the curve shape of a road is designed by combining a clothoid curve and an arc shape.
- the arcuate shape has a constant curvature
- the clothoid curve has a constant rate of change of curvature with respect to the travel distance. If a straight line and an arc shape are directly connected, the curvature at the connecting point changes discontinuously from 0 to an arc-shaped curvature having a certain value, but in the order of straight line-clothoid curve-arc shape-clothoid curve-straight line
- a curve shape in which a discontinuity of curvature does not occur is obtained.
- the road formed with a clothoid curve is designed on the assumption that it will run at a constant speed. Since the lateral acceleration is proportional to the curvature, the lateral acceleration changes at a constant rate with respect to time as long as the speed is kept constant.
- the rate of change of the lateral acceleration with respect to time is not constant because the vehicle generally travels with acceleration / deceleration except when traveling at a constant speed on an expressway.
- the vehicle In normal operation, the vehicle is decelerated in the section where the curvature increases and accelerated in the section where the curvature decreases. At this time, it is not necessary to focus only on the lateral acceleration as the force acting on the vehicle and the occupant. Since the longitudinal acceleration due to the increase / decrease of the speed and the lateral acceleration due to the change in the traveling direction act simultaneously, it is necessary to consider the transition of the acceleration vector in which the longitudinal acceleration and the lateral acceleration are combined.
- GVC G vectoring control
- the basic application form of GVC is to output a value obtained by multiplying the input of the lateral jerk, which is the time change rate of the lateral acceleration caused by the lateral movement of the vehicle, by gain, and control the longitudinal movement accordingly. is there. Since the lateral acceleration is determined by the speed and the curvature of the running track, the lateral jerk corresponds to the time change of the curvature, and as a result, the speed is controlled based on the time change of the track curvature.
- the speed profile and the acceleration profile are uniquely determined by applying the initial speed to an arbitrary trajectory by performing acceleration / deceleration according to the lateral jerk according to GVC.
- the speed profile refers to the transition of speed with respect to the travel distance or the transition of speed with respect to time
- the acceleration profile refers to the transition of acceleration with respect to the travel distance or transition of acceleration with respect to time
- GVC longitudinal acceleration
- Gy lateral acceleration
- Cxy the GVC gain
- ⁇ is the curvature at the position where the vehicle is traveling, so it is a function of time, and if you differentiate the above,
- Acceleration side can be calculated in the same way, and the velocity at any position on the orbit can be obtained, so that both the longitudinal acceleration and the lateral acceleration at each position on the orbit can be obtained. Therefore, a G-G diagram can be drawn with the transition of the acceleration vector for an arbitrary trajectory and initial velocity, with the longitudinal acceleration Gx as the horizontal axis and the lateral acceleration Gy as the vertical axis.
- Equation 5 ⁇ / ⁇ x is multiplied as a whole when the curvature is constant on the trajectory, that is, the straight section with zero curvature and the constant circumference with non-zero curvature.
- the lateral acceleration does not change, and the lateral jerk is 0. Therefore, the vehicle is traveling at a constant speed without acceleration / deceleration. I mean.
- the curvature ⁇ is in the square root in the numerator of Equation 4, so it slows down when the curvature increases as it travels on the track. I can read. On the other hand, it accelerates when the curvature decreases. Therefore, unless the curvature increases or decreases, the sign of longitudinal acceleration does not change. If the sign of curvature does not change, the sign of lateral acceleration does not change.
- the curvature of either the left or right curve is monotonously increasing or monotonous, which is the range in which the GG diagram fits in one quadrant without changing the sign of longitudinal acceleration or lateral acceleration. Focus on the decreasing interval.
- FIG. 2 is a diagram showing a road curve shape designed by connecting a clothoid curve and an arc shape, and shows a characteristic of a curvature change with respect to a travel distance L on a track along the curve shape.
- a section of a clothoid curve of 80 [m] is provided, and 100 [ The range up to [m] is shown in the graph with a solid line.
- FIG. 3 shows the result of calculating the own vehicle speed V, longitudinal acceleration Gx, and lateral acceleration Gy based on Equations 4 and 5 when the curve shape of FIG. It is a diagram.
- will be described later with reference to FIG.
- the deceleration command instantaneously becomes 0, and the GG diagram also has a sharp shape at this point.
- Fig. 4 shows the transition of the acceleration vector magnitude
- FIG. 5 shows the longitudinal acceleration Gx and the lateral acceleration Gy when the same curve shape is decelerated regardless of GVC and finishes at the beginning of the curve
- FIG. 6 shows the magnitude of the acceleration vector at that time. Shows the
- the acceleration vector does not have a minimum value, the increased acceleration vector size decreases monotonically until it reaches the magnitude of the acceleration vector traveling at a constant speed in the arc shape. It can be said that the diagram is generally arc-shaped, and passenger comfort is maintained.
- the clothoid curve trajectory is not suitable for the linkage between the longitudinal motion and the lateral motion, and in order to utilize GVC, the vehicle travel trajectory itself must be steered so that the GG diagram transitions in an arc as shown in FIG. Is desirable.
- the steering start point determination device sets the steering start point in accordance with the lane shape of the actual environment so that the trajectory in which the GG diagram changes in an arc shape fits in the actual curve shape when steering during curve traveling This ensures safe and comfortable driving without departing from the lane.
- the trajectory in which the GG diagram changes in an arc shape can be accommodated in the actual curve shape.
- FIG. 9 shows the configuration of the steering start point determination device 201.
- the steering start point determination device 201 includes a lane shape detection unit 202, a target vehicle speed estimation unit 203, and a steering start point determination unit 204.
- the lane shape detection unit 202 acquires lane shape information such as lane width and curve curvature based on objective information and road surface information detected from an external recognition device such as a stereo camera, millimeter wave radar, or laser radar. Further, the lane shape information of the traveling path may be acquired while specifying the position of the vehicle by GPS or the like using a map provided on the vehicle itself.
- the lane shape detection unit 202 calculates a target trajectory for traveling in the center of the lane and an estimated trajectory for performing GVC control from the acquired lane shape information, vehicle speed, current position, and traveling direction.
- the target vehicle speed estimation unit 203 can bend safely at a constant vehicle speed based on the curve curvature in the traveling direction of the vehicle obtained from the external recognition device, even without acceleration / deceleration control based on lateral movement as in GVC. And a target vehicle speed that is a vehicle speed at the time of entering a curve when the spontaneous deceleration control (brake driving) is not performed.
- FIG. 10 shows the processing of the steering start point determination unit.
- Steering start point determination unit 204 first acquires information transmitted from lane shape detection unit 202 and target vehicle speed estimation unit 203 (102).
- the target vehicle speed at the time of the curve approach obtained by the target vehicle speed estimation unit 203 is compared with the upper limit vehicle speed, and it is determined whether or not the GVC curve travel is necessary (103).
- the GVC curve travel is required in the determination (103)
- the lateral deviation between the estimated track by the GVC curve travel and the center of the own lane as the target track is calculated (104), and the lane from the own lane is calculated. It is determined whether or not there is a deviation (106).
- the GVC curve travel is not required in the determination (103)
- the GVC curve travel is not performed on the curve, so the target steering start point is set to the default steering start point (105).
- the control request signal is set to “No” (109).
- GVC curve travel is performed, and when the target vehicle speed is lower than the upper limit vehicle speed, GVC curve travel is not performed.
- the vehicle is sufficiently decelerated before the curve (or in a low-speed state), and when further decelerating, the driver may feel uncomfortable.
- the steering start point that does not deviate from the lane is set as the target steering start point (107), and the GVC control request signal is set to “necessary” (108).
- the target steering start point is set to the default steering start point and is not changed (105), and the GVC control request signal is set to "No" (109). .
- the target vehicle speed at the time of the curve approach obtained by the target vehicle speed estimation unit 203 is higher than the upper limit vehicle speed, it is necessary to perform a stable curve traveling by performing a curve traveling by GVC, and steering to perform a curve traveling by GVC. The control to set the starting point before the curve was described.
- a deceleration command for decelerating before the start of steering is commanded to the actuator so that the target vehicle speed falls below the upper limit vehicle speed.
- the GVC command is “No”. In this case, by notifying the driver to that effect, it is possible to take a method of reducing the uncomfortable feeling with respect to the large deceleration before the curve.
- a deceleration command for decelerating before starting the steering is commanded to the actuator to the extent that the lane does not deviate by changing the steering start point.
- the GVC command is “necessary”.
- the target steering start point and the GVC control request signal are output as signals for calculating control amounts for driving the actuators provided in the vehicle (110).
- Table 1 summarizes how to set the steering start point according to the state of each parameter.
- the present invention considers the degree before the steering start point.
- the numerical value shown in the degree in front represents the relation of the degree in front of the steering start point between the parameters.
- an estimated trajectory 502 can be calculated in consideration of acceleration / deceleration during steering.
- the estimated trajectory 502 is not limited to that shown in the present embodiment as long as it is a trajectory that takes into account acceleration and deceleration during steering as described above.
- the shift in the lateral direction of the target track 503 at the center of the lane and the estimated track 502 in the direction of travel of the vehicle 501 is assumed to be l.
- the time point at which l satisfies the following judgment formula 6 with the lane width W and the vehicle width H detected by the lane shape detection unit as inputs is set as a target steering start point.
- the determination of Equation 6 is performed every control cycle.
- ⁇ can be arbitrarily set as a margin.
- the wider the lane width W the closer the target steering start point can be set.
- the first embodiment of the present invention since it becomes possible to travel on a curved road on a track in which the GG diagram is arcuate, it is possible to perform an automatic driving that improves the ride comfort of the driver.
- the speed is reduced to a speed capable of GVC once and then the above control is performed, so that it is possible to minimize the deceleration before steering. It is possible to travel smoothly and safely on a curved road.
- the second embodiment is an example of a travel control device that is incorporated in the vehicle and incorporates the steering start point determination device 201 in the first embodiment.
- the vehicle has a mechanism that performs steering and acceleration / deceleration without depending on the operation of the driver by the control command of the travel control device. This is indispensable for the automatic driving function, and can also be used for a driving support function for assisting the operation of the driver.
- FIG. 12 shows various devices and system configurations provided in the vehicle 1 to be controlled.
- Steering device 18 is equipped with EPS (electric power steering).
- EPS electric power steering
- the EPS receives a control command transmitted from the travel control device 15 and acts as an active actuator without depending on the driver's operation. 11 and the right front wheel 12 are steered.
- the drive device 19 is composed of an internal combustion engine and / or an electric motor, receives a control command transmitted from the travel control device 15, and drives the left front wheel 11, which is a drive wheel, via the speed reducer 25 and the drive shaft 26 and the right side. A driving force is generated on the front wheels 12 to cause the vehicle 1 to travel. Further, the vehicle 1 is decelerated by generating a braking force on the drive wheels. Depending on the control command, acceleration / deceleration can be performed without depending on the operation of the driver.
- the braking control device 20 has a function of receiving a control command transmitted from the traveling control device 15 and controlling the braking force by applying hydraulic pressure to the braking devices 21 to 24. Depending on the control command, the vehicle can be decelerated without depending on the operation of the driver.
- the braking devices 21 to 24 are actuated by receiving the hydraulic pressure from the braking control device 20 and generate braking forces on the four wheels 11 to 14, respectively.
- the travel control device 15 includes information from the GPS sensor 17, the inertial sensor 16, a camera 28 that acquires external world information in front of the vehicle, a side image sensor 29, and wheel speed sensors 31 to 34 via a braking control device. Is input, and based on them, a control command is sent to the steering device 18, the drive device 19, and the braking control device 20, and the motion of the vehicle 1 is controlled.
- the braking devices 21 to 24 and the driving device 19 cooperate to control the braking force
- the steering device 18 includes a steering mechanism and a steering control device. May be.
- the vehicle has a mechanism that performs steering and acceleration / deceleration without depending on the operation of the driver by the control command of the travel control device. This is indispensable for the automatic driving function, and can also be used for a driving support function for assisting the operation of the driver.
- a third embodiment of the present application will be described with reference to FIGS. The description of the same configuration and effects as those of the first embodiment is omitted.
- the third embodiment is an example in which the steering start point determination device 201 is applied to the travel control device 15 provided in the vehicle 1 to be controlled.
- the travel control device 15 includes a steering start point determination device 201 and a travel control unit 601.
- the vehicle control device 701 drives each actuator based on a steering command or an acceleration / deceleration command output from the travel control device 15.
- the steering start point determination device 201 includes a lane shape detection unit 202, a target vehicle speed estimation unit 203, and a steering start point determination unit 204.
- the steering start point determination device 201 receives external world information acquired in real time from the camera 28 that captures the front of the vehicle, and the current position, traveling direction, and speed of the vehicle.
- the map information acquired in advance and the information of the trajectory generated in advance based on the map information are held.
- the position, traveling direction, and speed of the vehicle are information of the GPS sensor 17, the inertial sensor 16 that detects acceleration and angular velocity, the wheel speed sensors 31 to 34, the steering angle sensor 27, and the side image sensor 29 that detects the lane or road edge. It is obtained by integrating with higher accuracy.
- the vehicle control device 701 performs the traveling at a constant speed as in the normal automatic driving without performing the curved traveling by GVC.
- the steering start point can be set before the curve, compared to the case of “medium”. For this reason, it is possible to carry out the curve traveling while decelerating simultaneously with the steering without decelerating before the curve. And it can steer so that a track equivalent to a relaxation curve may be drawn in a straight section, so that a lane width is wide.
- the target steering start point is transmitted as a steering start trigger signal together with a GVC control request signal to the travel control unit 601, and the travel control unit 601 having received the target steering start point signal calculates a steering command and a target deceleration command. Commands the vehicle control device 701.
- the steering start point is assumed to be unchanged when the vehicle speed relative to the curvature of the approach curve is “slow”. This is because if the vehicle runs on a curve using GVC when the speed is low, oversteer occurs. On the other hand, the steering start point can be set behind the curve entrance, but understeer traveling may occur at the start of steering, which may cause a lane departure. From the standpoint of safety, the steering start point when the host vehicle speed is low is assumed to be unchanged.
- the vehicle control device 701 sends a steering command by feedforward control to the actuator of the steering device 18 based on the output signal of the travel control unit 601. At the same time, commands are sent to the drive device 19 and the braking control device 20 to control acceleration / deceleration or speed.
- the steering device 18 As the actuator for starting steering at the target steering start point, the steering device 18 is mainly used. However, the braking / driving force distribution of the four wheels is changed by the braking devices 21 to 24 or the driving device 19 and the suspension device is actively used. Other devices such as control may be used in combination.
- FIG. 14 is an embodiment showing a difference in steering start point due to a difference in vehicle width of the vehicle. If each vehicle having a different vehicle width (the vehicle width of the vehicle 801 is smaller than the vehicle width of the vehicle 811) travels on the curve on the premise of the same curve shape, the vehicle 801 having the larger vehicle width has the estimated GVC trajectory 802. The lateral displacement amount l 1 of the target track 803 in the center of the lane is larger than the lateral displacement amount l 2 of the GVC estimated track 812 and the target track 813 in the center of the lane when the vehicle 811 having a small vehicle width is Based on Equation 6, a steering start point can be provided before the curve.
- the steering start point for avoiding the obstacle can be advanced.
- the steering start point can be advanced in accordance with the lane change timing.
- the present invention can be applied to any scene that requires turning other than the above-described scenes such as normal corners, obstacle avoidance, and lane change, and the vehicle is turned by GVC depending on the lane width of the destination route and the vehicle speed at that time.
- SYMBOLS 1 Vehicle 11 to be controlled Left front wheel 12 Right front wheel 13 Left rear wheel 14 Right rear wheel 15 Travel control device 16 Inertial sensor 17 GPS sensor 18 Steering device 19 Drive device 20 Braking control device 21 Left front wheel braking device 22 Right front wheel braking device 23 Left rear wheel braking device 24 Right rear wheel braking device 25 Reducer 26 Drive shaft 27 Steering angle sensor 28 Camera 29 Side image sensor 31 Left front wheel speed sensor 32 Right front wheel speed sensor 33 Left rear wheel speed sensor 34 Right rear Wheel speed sensor 201 Steering start point determination device 202 Lane shape detection unit 203 Target vehicle speed estimation unit 204 Steering start point determination unit
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Abstract
Description
特許文献1では操舵開始点からカーブ開始点までに、車体を曲率に合わせて傾かせるための操舵操作をすることで、乗り心地の良いカーブ走行をさせる方法が開示されているが、加減速を伴ってカーブを走行する場合については触れられていない。
前記GVC軌道算出手段により求められた走行軌道が、前記車線形状検知部により検知された車線内に収まるように、カーブ手前に操舵開始点を決定する操舵開始点決定部と、を有する。
11 左前輪
12 右前輪
13 左後輪
14 右後輪
15 走行制御装置
16 慣性センサ
17 GPSセンサ
18 操舵装置
19 駆動装置
20 制動制御装置
21 左前輪制動装置
22 右前輪制動装置
23 左後輪制動装置
24 右後輪制動装置
25 減速機
26 ドライブシャフト
27 操舵角センサ
28 カメラ
29 側方画像センサ
31 左前輪車輪速センサ
32 右前輪車輪速センサ
33 左後輪車輪速センサ
34 右後輪車輪速センサ
201 操舵開始点判断装置
202 車線形状検知部
203 目標車速推定部
204 操舵開始点決定部
Claims (11)
- カーブの形状を検知するカーブ形状検知部と、
自車速度に基づき、横方向の加速度と前後方向の加速度の関係であるG-Gダイアグラムが弧状を描くような関係を満たす推定軌道を算出する推定軌道算出手段と、
前記推定軌道が、前記カーブ内に収まるように、カーブ手前に操舵開始点を決定する操舵開始点決定部と、
を有することを特徴とする走行制御装置。 - 前記推定軌道が前記車線内に収まらないと判断した場合、
前記推定軌道が前記車線内に収まる車速となるように減速制御する請求項1に記載の走行制御装置。 - 前記推定軌道が前記車線内に収まらないと判断した場合、
一定車速で安定して走行できる車速となるように減速制御する請求項1に記載の走行制御装置。 - 前記自車速度が、前記カーブを一定速度で安定して走行できる速度である目標車速か否かを判断する目標車速推定部をさらに有し、
前記目標車速推定部が否であると判断した場合に、推定軌道算出手段が作動する請求項1乃至3の何れかに記載の走行制御装置。 - 前記カーブ形状検知部で検知されたカーブの車線幅が、予め定めたカーブの車線幅よりも大きい場合には、予め定めた操舵開始点よりも早い位置から操舵操作を開始するように前記制御指令値を出力する請求項1に記載の走行制御装置。
- 前記目標車速が前記カーブの曲率に基づいて決定される車速より大きい場合は、前記操舵開始点のタイミングで自車の横運動に基づく前後加速度の制御を開始し、
前記目標車速が前記カーブの曲率に基づいて決定される車速より小さい場合は、前記走行制御部から出力された指令に基づいて予め定めた走行経路に沿って車速と操舵の制御を開始する請求項4に記載の走行制御装置。 - 前記操舵開始点決定部は、
前記推定軌道と、前記カーブ形状と、に基づいて車線を逸脱するか否かを判断し、判断した結果に基づいて操舵開始点を決定する請求項1に記載の走行制御装置。 - 請求項1乃至3に記載の走行制御装置と、
前記走行制御装置から出力される制御指令に基づき駆動するブレーキ、ステアリング、アクセル、
を備える車両。 - 請求項4に記載の走行制御装置と、
前記走行制御装置から出力される制御指令に基づき駆動するアクチュエータと、
を備える車両。 - 前記操舵開始点は、車線幅、車体幅、車速、カーブ曲率、前記推定軌道のうち少なくとも1つに基づき決定される請求項1乃至3に記載の走行制御装置。
- 前記操舵開始点で、前記推定軌道に基づき車両を制御する請求項1乃至3に記載の走行制御装置。
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