WO2023139867A1 - 車両運動制御装置、および、車両運動制御方法 - Google Patents
車両運動制御装置、および、車両運動制御方法 Download PDFInfo
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- WO2023139867A1 WO2023139867A1 PCT/JP2022/039604 JP2022039604W WO2023139867A1 WO 2023139867 A1 WO2023139867 A1 WO 2023139867A1 JP 2022039604 W JP2022039604 W JP 2022039604W WO 2023139867 A1 WO2023139867 A1 WO 2023139867A1
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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
- B60W30/02—Control of vehicle driving stability
- B60W30/045—Improving turning performance
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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
-
- 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
- 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
- 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
- B60W60/00—Drive control systems specially adapted for autonomous road vehicles
- B60W60/001—Planning or execution of driving tasks
- B60W60/0013—Planning or execution of driving tasks specially adapted for occupant comfort
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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
- B60W2552/00—Input parameters relating to infrastructure
- 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
- 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
- B60W2552/00—Input parameters relating to infrastructure
- B60W2552/30—Road curve radius
-
- 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
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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
- B60W2720/12—Lateral speed
- B60W2720/125—Lateral acceleration
Definitions
- the present invention relates to a vehicle motion control device and a vehicle motion control method that control the motion of a vehicle according to the travel route.
- driving assistance and autonomous driving technology is known that generates a travel trajectory consisting of information such as the vehicle's target travel route and travel speed, and controls the powertrain, brakes, steering, etc. so that the vehicle travels along that travel trajectory.
- the simplest driving route control is, for example, lane keeping control that sets the center of the lane as the driving route.
- Patent Document 1 As a more advanced travel route control technology, for example, there is one disclosed in Patent Document 1, and the latter part of Claim 1 of Patent Document 1 states, "Based on the travel road condition information, a constraint condition that constrains the first friction circle characteristic due to the tire grip limit of the longitudinal acceleration and lateral acceleration to be less than or equal to the longitudinal acceleration value and the lateral acceleration value due to the tire grip limit, generates a target speed profile along the target trajectory using the constraint condition, generates a target speed profile along the target trajectory, and follows the target speed profile when the vehicle travels along the target trajectory.
- a driving support method is described.
- Patent Document 1 is directed to a driving support method that assumes the tire grip limit caused by the curvature of the road in the future, and discloses a driving support method that suppresses the deviation of the vehicle's trajectory from the target trajectory regardless of the road conditions in front of the vehicle by generating a target speed profile for the vehicle based on the constraints imposed by the tire grip limit in a scene in which the vehicle travels along the target trajectory.
- Patent Document 1 the driving support method of Patent Document 1 is limited to technology for suppressing the peak values of longitudinal and lateral accelerations based on the tire grip limit, and is not a technology for improving passenger comfort and ride comfort. Therefore, if the technology disclosed in Patent Document 1 is used to suppress the peak values of longitudinal acceleration and lateral acceleration, the number of times of acceleration and deceleration increases to compensate for the decrease in vehicle speed, and the behavior of the vehicle becomes unstable.
- the object of the present invention is to provide a vehicle motion control device that improves the ride comfort and comfort of passengers by setting the speed of the vehicle so that the physical quantities related to vehicle behavior, such as acceleration and jerk, are within specified values, taking into account the linkage between the longitudinal motion and the lateral motion, such as matching the peak point of the curvature of the travel route and the zero point of the longitudinal acceleration of the vehicle.
- the physical quantities related to vehicle behavior such as acceleration and jerk
- the vehicle motion control device of the present invention includes a route planning unit that generates a route for a vehicle to travel, a specified value setting unit that sets specified values for physical quantities of vehicle behavior when traveling on the route, a route feature point setting unit that sets route feature points based on the route and the specified values, and a travel speed generation unit that generates a speed command value for the vehicle to travel on the route based on the route, the specified value, and the route feature points.
- the vehicle motion control device sets the zero point of the longitudinal acceleration based on the route feature point that is the peak point of the curvature of the route, and sets the peak point of the longitudinal acceleration based on the route feature point that is the peak point of the distance differential value of the curvature.
- the vehicle motion control device or the vehicle motion control method of the present invention it is possible to improve the ride comfort and comfort of the occupants by setting the speed of the vehicle so that physical quantities related to vehicle behavior, such as acceleration and jerk, are within specified values, taking into consideration the linkage between longitudinal motion and lateral motion, such as aligning the peak point of the curvature of the travel route with the zero point of the longitudinal acceleration of the vehicle.
- FIG. 2 is a functional block diagram of the in-vehicle system of Embodiment 1;
- FIG. 2 is a functional block diagram of a traveling trajectory generation unit of Embodiment 1;
- FIG. 2 is a functional block diagram of a speed planning unit of Embodiment 1;
- 4 is a flow chart showing an outline of processing of a speed planning unit according to the first embodiment; An example of a physical quantity graph when using the speed command value in step S31 during running.
- FIG. 10 is a flow chart showing an outline of processing of a speed planning unit according to the second embodiment; An example of a physical quantity graph when using the speed command value of step S5 during running. An example of a physical quantity graph when using the speed command value of step S6 during running. 10 is a flow chart showing an outline of processing of a speed planning unit according to the third embodiment; An example of a physical quantity graph when the speed command value of step S8 is used during running.
- FIG. 11 is a flow chart showing an outline of processing of a speed planning unit according to the fourth embodiment; FIG. FIG. 11 is a functional block diagram of a speed planning unit of Example 5;
- FIG. 1 the vehicle motion control device 2 according to the first embodiment of the present invention will be explained using FIGS. 1 to 8.
- FIG. 1 the vehicle motion control device 2 according to the first embodiment of the present invention will be explained using FIGS. 1 to 8.
- FIG. 1 is a functional block diagram of an in-vehicle system 1 having a vehicle motion control device 2 of this embodiment.
- the in-vehicle system 1 is installed in the own vehicle and is a system for executing vehicle motion control such as driving assistance and automatic driving. A description will be given below.
- the external communication device 11 performs inter-vehicle communication between the own vehicle and other vehicles or road-to-vehicle communication between the own vehicle and the roadside unit by wireless communication, and transmits and receives information such as the vehicle and the surrounding environment.
- the GNSS 12 receives radio waves emitted from artificial satellites such as quasi-zenith satellites and GPS (Global Positioning System) satellites, and acquires information such as the position of the vehicle.
- artificial satellites such as quasi-zenith satellites and GPS (Global Positioning System) satellites
- the map information storage unit 13 stores general road information used in navigation systems, road information including information on curves such as road width and road curvature, information on road surface conditions and traffic conditions, and information on vehicles and the surrounding environment, which is information on the running status of other vehicles. Information about the vehicle and the surrounding environment is successively updated by information obtained through vehicle-to-vehicle communication and road-to-vehicle communication via the external communication device 11 .
- the sensor 14 is an external recognition sensor that detects information such as an image sensor, millimeter wave radar, lidar, and other information about the vehicle and the surrounding environment, and a sensor that detects information such as the driver's operation, vehicle speed, acceleration, jerk, angular velocity, and wheel steering angle.
- Information such as the vehicle and the surrounding environment detected by the external recognition sensor is, for example, information on various objects such as obstacles, signs, lane boundaries, lane outside lines, buildings, pedestrians, and other vehicles that exist around the own vehicle.
- the sensor 14 recognizes a lane boundary line, a lane outside line, and the like, for example, based on the difference between the brightness of the white line and the road surface in the image data captured by the image sensor.
- the HMI unit 15 displays information required by the user from information received by user input operations such as driving mode selection and destination setting, information acquired by the external communication device 11, GNSS 12, and sensor 14, and information recorded in the map information storage unit 13, and provides voice guidance from the speaker.
- the HMI unit 15 also generates an alarm to alert the user.
- the driving mode includes, for example, comfort mode, economy mode, sports mode, etc.
- the driving mode is arbitrarily set by the user, set in advance by the user, or set by the operation management unit 3 described later based on the driving situation information, and the speed, acceleration, jerk, etc. of the vehicle are set. Therefore, the specified value setting unit 31 of the operation management unit 3 changes the specified value of the behavior of the vehicle according to the set travel mode.
- the running modes include a shortest time mode that minimizes travel time, a shortest distance mode that minimizes travel distance, and the like.
- the vehicle motion control device 2 has, as shown in FIG. Specifically, the vehicle motion control device 2 is an ECU (Electronic Control Unit) that has hardware such as an arithmetic unit such as a CPU (Central Processing Unit), a main memory device such as a semiconductor memory, an auxiliary memory device such as a semiconductor memory, and a communication device.
- the operation management unit 3, the travel trajectory generation unit 4, and the travel control unit 5 have separate configurations, but they do not necessarily have to have separate configurations, and when these units are used in an actual vehicle, various functions of these units may be realized by a higher-level controller.
- the operation management unit 3 Based on the information acquired by the external communication device 11, the GNSS 12, the sensor 14, and the map information recorded in the map information storage unit 13, the operation management unit 3 generates information on the position of the vehicle, information on various objects existing around the vehicle (information on the vehicle and surrounding environment), and information on vehicle behavior such as lateral acceleration, yaw rate, and lateral jerk. In addition, the operation management unit 3 regularly transmits the information on the position of the own vehicle, the information on various objects, and the information on the behavior of the vehicle to other vehicles and roadside units via the external communication device 11, and also to the map information storage unit 13, and sequentially updates the map information stored in the map information storage unit 13.
- the operation management unit 3 sets information on the route from the current position of the vehicle to the destination based on the information on the position of the own vehicle, the information on various objects, the information on the behavior of the vehicle, and the information received by the HMI unit 15 (for example, driving mode and destination).
- the route information set here includes the specified value of the behavior of the vehicle, which is set by the specified value setting unit 31 of the operation management unit 3 according to the driving mode.
- Information generated or set by the operation management unit 3 may be hereinafter referred to as "running status information".
- the traveling trajectory generation unit 4 has an information acquisition unit 41, a route planning unit 42, a speed planning unit 43, and an information output unit 44, as shown in FIG.
- the route planning section 42 based on the traveling situation information transmitted from the operation management unit 3 and acquired by the information acquiring section 41, the route planning section 42 generates a route (hereinafter referred to as "route command value P") that serves as a traveling target when the vehicle travels on the road.
- route command value P a route that serves as a traveling target when the vehicle travels on the road.
- the route command value P is, for example, a command value generated based on either information about the vicinity of the own vehicle acquired by the sensor 14 or the like, or information obtained by synthesizing distant map information recorded in the map information storage unit 13 or the like with the aforementioned near information, but the method of generating the route command value P is not limited.
- the speed planning unit 43 Based on the route command value P and the travel route information, the speed planning unit 43 generates a travel target speed (hereinafter referred to as “speed command value”) when the vehicle travels on the road. Details of the speed planning unit 43 will be described later.
- the travel control unit 5 sets the target driving force, the target braking force, the target steering angle, etc., and controls the powertrain system 6, the brake system 7, and the steering system 8 so that the vehicle follows the travel trajectory output from the travel trajectory generation unit 4.
- Control target group of vehicle motion control device 2 The powertrain system 6 controls the driving force generated by the internal combustion engine, the electric motor, etc. based on the operation by the driver and the target driving force output from the travel control unit 5 .
- the brake system 7 controls the braking force generated by the brake calipers and the like based on the operation by the driver and the target braking force output from the travel control unit 5.
- the steering system 8 controls the steering angle of the wheels based on the driver's operation and the target steering angle output from the travel control unit 5 .
- the speed planning unit 43 generates a speed command value of the vehicle based on the position and speed of the vehicle, the upper limit value of behavior, the route command value P, etc., and has an information acquisition unit 43a, a route characteristic point setting unit 43b, a running speed generation unit 43c, and an information output unit 43d shown in FIG. A description will be given below.
- the information acquisition unit 43a acquires the travel status information from the operation management unit 3, acquires the route command value P from the route planning unit 42, and outputs them to each unit in the speed planning unit 43.
- the route feature point setting unit 43b Based on the route command value P acquired from the information acquisition unit 43a, the route feature point setting unit 43b sets feature points on the route command value P such as the peak point of the curvature and the peak point of the distance differential value of the curvature.
- the path characteristic points set by the path characteristic point setting unit 43b may be a point with zero curvature or a starting point or an end point of the path command value P, and the definition of the path characteristic points is not limited.
- the traveling speed generation unit 43c generates a speed command value when the host vehicle travels the route command value P based on the traveling situation information and the route command value P from the information acquisition unit 43a and the route feature points such as the curvature peak point from the route feature point setting unit 43b.
- the information output unit 43d outputs the speed command value from the traveling speed generation unit 43c to the information output unit 44.
- FIG. 4 is a plan view of the travel route along which the vehicle V travels, and exemplifies the route command value P set within the travelable region R of the vehicle V at a certain time.
- this drivable region R there are an inflection point H at the start point of a left turn and an inflection point N at the end point.
- FIG. 5A is an example of the curvature of a travel route having a transition curve section and a steady curve section on the curve C of the travel route in FIG. 4 and the distance derivative value of the curvature.
- the section from the inflection point H to the inflection point U and the section from the inflection point T to the inflection point N are transition curve sections in which the curvature linearly changes, and since the distance derivative value of the curvature is a constant value, there is no peak point of the distance derivative value of the curvature.
- FIG. 1 the section from the inflection point H to the inflection point U and the section from the inflection point T to the inflection point N are transition curve sections in which the curvature linearly changes, and since the distance derivative value of the curvature is a constant value, there is no peak point of the distance derivative value of the curvature.
- FIG. 5B is an example of the curvature of the travel route having a transition curve section in the curve C of the travel route in FIG. 4 and the distance derivative value of the curvature.
- there is a curvature peak point K and the section from the inflection point H to the curvature peak point K and the section from the curvature peak point K to the inflection point N are transition curve sections in which the curvature changes nonlinearly, and the point W and the point F at which the distance derivative value of curvature peaks in each transition curve section are defined as the peak points of the distance derivative value of curvature.
- FIG. 6 is a flow chart of the speed planning unit 43 of the first embodiment.
- step S1 the information acquisition section 43a of the speed planning section 43 acquires the travel status information from the information acquisition section 41 and acquires the route command value P from the route planning section .
- step S2 the route feature point setting unit 43b of the speed planning unit 43 sets route feature points such as the peak point of the curvature on the route command value P (hereinafter referred to as “first route feature point”) and the peak point of the distance differential value of curvature (hereinafter referred to as “second route feature point”) based on the travel situation information and the route command value P acquired in step S1.
- first route feature point the peak point of the curvature on the route command value P
- second route feature point the peak point of the distance differential value of curvature
- step S31 the travel speed generation unit 43c of the speed planning unit 43 generates a speed command value such that the longitudinal acceleration generated when traveling the route command value P is within a specified value, based on the travel situation information and the route command value P acquired in step S1, and the route characteristic points set in step S2.
- FIG. 7A is an example of (b) vehicle speed, (c) longitudinal acceleration, (d) lateral acceleration, (e) longitudinal jerk, (f) graph of the distance axis of lateral jerk, and (g) diagram of longitudinal acceleration and lateral acceleration, which occur when the vehicle V travels at a constant speed (broken line) and when the vehicle V travels at the speed command value generated in step S31 (solid line).
- step S31 (when the speed command value in step S31 is used) considers the linkage between the longitudinal motion and the lateral motion, and in order to keep each physical quantity related to vehicle behavior within the specified values indicated by the dashed-dotted lines, (a) the peak point of the curvature (first path characteristic point) is aligned with (c) the zero point of the longitudinal acceleration, and (a) the peak point of the distance differential value of the curvature (second path characteristic point) is aligned with (c) the peak point of the longitudinal acceleration, so that (c) the longitudinal acceleration is within the range of the specified value. is maximized with
- FIG. 7A illustrates a situation in which the use of the speed command value in step S31 slightly improves the riding comfort and comfort of the occupants compared to when the vehicle is traveling at a constant speed, but (d) the lateral acceleration still exceeds the specified value, so further improvement of the speed command value is necessary.
- step S32 the travel speed generation unit 43c of the speed planning unit 43 determines whether or not the physical quantity related to vehicle behavior that occurs when traveling the route command value P is within a specified value based on the speed command value generated in step S31. If the physical quantity relating to vehicle behavior is within the specified value (step S32, YES), the process proceeds to step S4, and if the physical quantity relating to vehicle behavior is greater than the specified value (step S32, NO), the process proceeds to step S33.
- step S33 the travel speed generation unit 43c of the speed planning unit 43 generates a speed command value in which both the longitudinal acceleration and the longitudinal jerk occurring when the vehicle travels along the route command value P are within specified values, based on the travel situation information and the route command value P obtained in step S1, the route characteristic points defined in step S2, and the speed command value generated in step S31.
- FIG. 7B is an example of a physical quantity related to vehicle behavior that occurs when the vehicle V travels with the speed command value generated in step S31 (broken line) and when the vehicle V travels with the speed command value generated in step S33 (solid line), and the configuration of the graph is the same as that of FIG. 7A.
- the solid line in FIG. 7B (when the speed command value in step S33 is used) is such that (c) the peak point of the longitudinal acceleration is set to the peak point of the distance differential value of the curvature in the same manner as in step S31, and (e) the longitudinal jerk is maximized within the specified value in order to keep the physical quantity related to the vehicle behavior within the specified value.
- FIG. 7B illustrates a situation in which the use of the speed command value in step S33 further improves the riding comfort and comfort of the occupants compared to the use of the speed command value in step S31, but (d) the lateral acceleration still exceeds the specified value, so further improvement in the speed command value is necessary.
- step S34 the travel speed generation unit 43c of the speed planning unit 43 determines whether or not the physical quantity related to vehicle behavior occurring when traveling the route command value P is within a specified value based on the speed command value generated in step S33. If the physical quantity relating to vehicle behavior is within the specified value (step S34, YES), the process proceeds to step S4, and if the physical quantity relating to vehicle behavior is greater than the specified value (step S34, NO), the process proceeds to step S35.
- the driving speed generation unit 43C of the speed planning unit 43 is based on the driving status information obtained in step S1, the route command value P, the route feature set in the step S2, and the speed command value generated in step S33, and the deceleration start point is the front (direction to approach your vehicle V).
- a speed command value in which the physical volume related to the vehicle behavior is within the specified value by moving the ending point in the back (the direction away from the vehicle V).
- FIG. 7C is an example of a physical quantity related to vehicle behavior that occurs when the vehicle V travels with the speed command value generated in step S33 (dashed line) and when the vehicle V travels with the speed command value generated in step S35 (solid line), and the configuration of the graph is common to FIGS. 7A and 7B.
- the solid line in FIG. 7C is an example of a physical quantity related to vehicle behavior that occurs when the vehicle V travels with the speed command value generated in step S33 (dashed line) and when the vehicle V travels with the speed command value generated in step S35 (solid line), and the configuration of the graph is common to FIGS. 7A and 7B.
- step S35 (when the speed command value in step S35 is used) is such that (c) the peak point of the longitudinal acceleration is set to the peak point of the distance differential value of the curvature in the same manner as in steps S31 and S33 in order to keep the physical quantity related to the vehicle behavior within the specified value, (e) the longitudinal jerk is maximized within the specified value, and the deceleration start point is set on the straight road S before the connecting point of the straight road S and the curve C so that the physical quantity related to the vehicle behavior is within the specified value ((c) the longitudinal acceleration). (see graph).
- FIG. 7C illustrates a situation in which (c) the longitudinal acceleration and (d) the lateral acceleration are within the specified values by using the speed command value in step S35, and the occupant's riding comfort and comfort are sufficiently ensured.
- step S4 the information output section 43d of the speed planning section 43 outputs the speed command value generated in any one of steps S31, S33, and S35 to the information output section 44 of the travel trajectory generation unit 4. It should be noted that all of the speed command values output in step S4 can keep physical quantities related to vehicle behavior within specified values, so that the travel control unit 5 that receives the speed command values from the information output section 44 can control the powertrain system 6, the brake system 7, and the steering system 8 so as to achieve vehicle control that provides a comfortable ride.
- FIGS. 8A and 8B are other examples of physical quantities related to vehicle behavior that occur when the vehicle V travels with the (a) curvature of the route command value P in FIG. 4 and the speed command value generated in the flowchart shown in FIG. 6, and the graph configuration is common to FIG.
- the (b) specified value of the vehicle speed is constant, but in FIGS. 8A and 8B, the (b) specified value of the vehicle speed is set smaller when traveling on the curve C than when traveling on the straight road S.
- the processing up to step S35 in FIG. 6 is performed in both the situations of FIG. 8A (at the time of entering the curve C) and FIG. 8B (at the time of exiting the curve C), thereby further suppressing the vehicle speed when traveling on the curve C, and (b) keeping the physical quantities related to the vehicle behavior, including the vehicle speed, within the prescribed values.
- the peak point of the longitudinal acceleration is aligned with the peak point of the distance differential value of the curvature, and the zero point of the longitudinal acceleration is aligned with the peak point of the curvature. Then, the range in which the longitudinal acceleration occurs is gradually expanded until the physical quantity related to vehicle behavior falls within the specified value. can be done.
- FIGS. 9 to 10B the vehicle motion control device 2 of Embodiment 2 of the present invention will be described using FIGS. 9 to 10B. Duplicate descriptions of common points with the first embodiment will be omitted.
- FIG. 9 is a flow chart of the speed planning unit 43 of the second embodiment.
- the flow chart of the speed planning unit 43 of the present embodiment shown here is obtained by adding steps S5 to S7 between steps S32, S4 and S33 to the flow chart of the speed planning unit 43 of the first embodiment shown in FIG. That is, in this embodiment, if it is determined in step S32 that the physical quantity based on the speed command value in step S31 is within the specified value, the process proceeds to step S5, and if not, the process proceeds to step S6.
- step S5 the travel speed generation unit 43c of the speed planning unit 43 generates a speed command value after moving the position of the peak point of the longitudinal acceleration forward or backward on the distance axis.
- vehicle control based on the speed command value in step S31 guarantees a ride comfort of at least a certain level.
- this step by correcting the longitudinal jerk of the speed command value in step S31 so as to be smaller, it becomes possible to realize vehicle control that further suppresses unstable behavior of the vehicle and provides a more comfortable ride.
- step S6 the running speed generation unit 43c of the speed planning unit 43 generates a speed command value after moving the position of the longitudinal acceleration peak point forward or backward on the distance axis so that the physical quantity related to vehicle behavior that is greater than the specified value is improved (closer to the specified value). Since it is determined in step S32 that the speed command value in step S31 cannot achieve sufficiently comfortable vehicle control, the process of this step corrects the speed command value generated in step S31 so as to reduce the longitudinal jerk, thereby increasing the possibility of realizing vehicle control that provides a comfortable ride. It should be noted that even after the processing of this step, there are cases where the physical quantity related to vehicle behavior cannot be kept within the specified value, so processing for further improving the speed command value (for example, steps S33 and S35 in FIG. 6) may need to be performed.
- step S7 the travel speed generation unit 43c of the speed planning unit 43 determines whether or not the physical quantity related to vehicle behavior that occurs when traveling the route command value P is within a specified value based on the speed command value in step S6. If the physical quantity relating to vehicle behavior is within the specified value (step S7, YES), the process proceeds to step S4, and if the physical quantity relating to vehicle behavior is greater than the specified value (step S7, NO), the process proceeds to step S33. Thereby, the speed command value in step S6 can be further corrected as required.
- FIG. 10A is an example of a physical quantity related to vehicle behavior that occurs when the vehicle V travels with the speed command value generated in step S31 of Example 1 (dashed line) and when the vehicle V travels with the speed command value generated in step S5 of Example 2 (solid line), and the configuration of the graph is the same as in FIG. 7A of Example 1.
- the solid line in FIG. 10A indicates (c) that the peak point of the longitudinal acceleration is in the near side (in the direction toward the own vehicle V) within a range in which the physical quantity related to vehicle behavior is within a specified value, thereby reducing the jerk in the region where the acceleration is large.
- the peak point of the longitudinal acceleration is set to the front or back within the range in which the physical quantity related to vehicle behavior is within the specified value, thereby reducing the jerk in areas where the acceleration is large, thereby suppressing the unstable behavior of the vehicle and improving the ride comfort of the occupants.
- FIG. 10B is an example of physical quantities related to vehicle behavior that occur when the vehicle V travels with the curvature (a) of the route command value P in FIG.
- the solid line in FIG. 10B has the peak point of the longitudinal acceleration at the back (in the direction away from the own vehicle V) so that the physical quantity related to vehicle behavior is within the specified value.
- the peak point of the longitudinal acceleration is set to the front or the back so that the physical quantity related to the vehicle behavior is within the specified value, so that the physical quantity related to the vehicle behavior can be kept within the specified value while the longitudinal motion and the lateral motion are coordinated, thereby improving the ride comfort of the passenger.
- FIGS. 11 and 12 a vehicle motion control device 2 according to a third embodiment of the present invention will be described with reference to FIGS. 11 and 12.
- FIG. Duplicate descriptions of common points with the first and second embodiments will be omitted.
- FIG. 11 is a flow chart of the speed planning unit 43 of the third embodiment.
- the flow chart of the speed planning section 43 of the present embodiment shown here is obtained by adding step S8 between steps S32 and S5 to the flow chart of the speed planning section 43 of the second embodiment shown in FIG.
- step S8 the traveling speed generation unit 43c of the speed planning unit 43 generates a speed command value that does not make the longitudinal acceleration at the curvature peak point zero when the physical quantity related to the vehicle behavior occurring in the own vehicle V traveling based on the speed command value in step S31 is within a specified value.
- FIG. 12 shows an example of the physical quantity related to the vehicle behavior that occurs when the own vehicle V travels with the (a) curvature of the route command value P in FIG.
- (c) longitudinal acceleration and (e) longitudinal jerk are maximized within a range in which physical quantities related to vehicle behavior fall within specified values.
- FIG. 13 is a flow chart of the speed planning unit 43 of the fourth embodiment.
- the flowchart of this embodiment shown here is obtained by adding step S9 between steps S1 and S2 to the flowchart of the first embodiment shown in FIG. 6, the flowchart of the second embodiment shown in FIG. 9, and the flowchart of the third embodiment shown in FIG.
- step S9 the speed planning unit 43 determines whether or not to generate a speed command value based on a flag generated by a controller higher than the speed planning unit 43 (for example, the operation management unit 3). If the flag indicates that the process is prohibited (step S9, YES), the process is terminated and no speed command value is generated. On the other hand, if the flag indicates that processing is permitted (step S9, NO), the process proceeds to step 2 and subsequent steps to generate a desired speed command value.
- a flag generated by a controller higher than the speed planning unit 43 for example, the operation management unit 3
- the host controller prohibits the generation of a speed command value that improves ride comfort, for example, in an emergency such as when avoiding a preceding vehicle that has suddenly stopped, by shifting to the host controller's speed control that emphasizes avoidance performance, it is possible to avoid a rear-end collision with the preceding vehicle, even though the ride comfort will deteriorate, thereby improving safety.
- FIG. 14 is a functional block diagram of the speed planning unit 43 of the fifth embodiment.
- the speed planning unit 43 of the present embodiment shown here is obtained by changing the traveling speed generation unit 43c of the speed planning unit 43 of the first embodiment shown in FIG.
- the running speed candidate generation unit 43e Based on the travel status information and the route command value P acquired by the information acquisition unit 43a, the running speed candidate generation unit 43e generates a plurality of speed command values in which the physical quantity related to the vehicle behavior that occurs when traveling the route command value P is within a specified value, and outputs them to the running speed selection unit 43f.
- the travel speed selection unit 43f selects one speed command value based on the current travel mode (shortest time mode, economy mode, etc.) indicated by the travel situation information from the information acquisition unit 43a and a plurality of speed command value candidates from the travel speed candidate generation unit 43e, and the information output unit 43d outputs it to the travel control unit 5.
- the speed command value candidate with the shortest travel time is selected from among the plurality of speed command value candidates generated by the driving speed candidate generation unit 43e
- the speed command value candidate with the minimum energy consumption is selected from among the plurality of speed command value candidates. That is, the travel speed selection unit 43f selects the speed command value with the shortest movement time from among the multiple speed command value candidates, or selects the speed command value with the minimum energy consumption from the multiple speed command value candidates.
- the specified value setting unit 31 of the operation management unit 3 of this embodiment may set a plurality of specified values based on the mass, size and arrangement of the vehicle occupants and cargo, and the state of the route on which the vehicle travels.
- the running speed candidate generation unit 43e can generate a plurality of speed command values according to the number of passengers, seating positions, etc.
- the running speed selection unit 43f selects a speed command value according to the number of passengers, etc., thereby further improving the ride comfort when the vehicle is running.
- the vehicle motion control device of the fifth embodiment not only can the same effects as those of the first to fourth embodiments be obtained, but also the vehicle motion can be controlled according to the selection of the driving mode and the mounting condition of the vehicle.
- the present invention is not limited to the above-described embodiments, and includes various modifications.
- the above-described embodiments are specifically described in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.
- part of the configuration of one embodiment can be replaced with part of the configuration of another embodiment.
- the configuration of another embodiment can be added to the configuration of one embodiment.
- a part of the configuration of each embodiment can be deleted, a part of another configuration can be added, and a part of another configuration can be substituted.
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Abstract
Description
図1は、本実施例の車両運動制御装置2を有する車載システム1の機能ブロック図である。車載システム1は、自車両に搭載され、運転支援や自動運転などの車両運動制御を実行するためのシステムであり、図示するように、車外通信装置11、GNSS(Global Navigation Satellite System)12、地図情報記憶部13、センサ14、HMI(human machine interface)ユニット15、車両運動制御装置2、パワートレインシステム6、ブレーキシステム7、ステリングシステム8を有する。以下、順次説明する。
車外通信装置11は、無線通信により、自車両と他車両の間の車車間通信、又は、自車両と路側機の間の路車間通信を実行し、車両や周辺環境などの情報を、送受信する。
車両運動制御装置2は、図1に示すように、運行管理ユニット3、走行軌道生成ユニット4、走行制御ユニット5を有する。この車両運動制御装置2は、具体的には、CPU(Central Processing Unit)などの演算装置、半導体メモリなどの主記憶装置や補助記憶装置、及び、通信装置などのハードウェアを有し、車両を統括制御するECU(Electronic Control Unit)であり、主記憶装置にロードされるプログラムを演算装置で実行することにより、運行管理ユニット3等の様々な機能を実現するものである。なお、本実施例では、説明の都合上、運行管理ユニット3、走行軌道生成ユニット4、走行制御ユニット5は分離した構成を有するが、必ずしも分離した構成を有する必要はなく、これらユニットを実際の車両に使用する場合には、上位のコントローラにより、これらユニットの様々な機能を実現してもよい。
パワートレインシステム6は、ドライバによる操作や走行制御ユニット5から出力される目標駆動力に基づいて、内燃機関や電動機などにより発生する駆動力を制御する。
次に、図3の機能ブロック図を用いて、速度計画部43の詳細を説明する。速度計画部43は、車両の位置や速度、挙動の上限値、経路指令値Pなどに基づいて、車両の速度指令値を生成するものであり、図3に示す、情報取得部43a、経路特徴点設定部43b、走行速度生成部43c、情報出力部43dを有する。以下、順次説明する。
次に、図4の走行経路を走行する状況下で時々刻々と生成される経路特徴点について、図5Aと図5Bを用いて説明する。
次に、図6から図7Cを用いて、自車両Vが図4の走行経路を走行する状況下で、速度計画部43で時々刻々と生成される速度指令値を説明する。
次に、図8A、図8Bを用いて、速度計画部43の処理の別例を説明する。図8A、図8Bは、図4の経路指令値Pの(a)曲率と、自車両Vが図6で示したフローチャートで生成された速度指令値で走行する場合に生じる車両挙動に関する物理量の別例であり、グラフの構成は図7Aなどと共通である。
これにより、乗り心地の良い車速でカーブCを走行しつつ、加速度や加加速度を規定値内に収めることができる。
なお、実施例1や実施例2との共通点は重複説明を省略する。
例えば、上記した実施例は本発明を分かりやすく説明するために、具体的に説明したものであり、必ずしも説明した全ての構成を有するものに限定されるものではない。また、ある実施例の構成の一部を、他の実施例の構成の一部に置換することもできる。また、ある実施例の構成に他の実施例の構成を追加することもできる。また、各実施例の構成の一部について、それを削除し、他の構成の一部を追加し、他の構成の一部と置換することもできる。
Claims (9)
- 車両が走行する経路を生成する経路計画部と、
前記経路を走行する際の車両挙動の物理量の規定値を設定する規定値設定部と、
前記経路と前記規定値に基づいて経路特徴点を設定する経路特徴点設定部と、
前記経路と前記規定値と前記経路特徴点に基づいて前記車両が前記経路を走行するための速度指令値を生成する走行速度生成部を備え、
前記走行速度生成部は、
前記経路の曲率のピーク点である経路特徴点に基づいて前後加速度のゼロ点を設定し、 前記曲率の距離微分値のピーク点である経路特徴点に基づいて前後加速度のピーク点を設定することを特徴とする車両運動制御装置。 - 請求項1に記載の車両運動制御装置において、
前記走行速度生成部は、前記曲率のピーク点に前後加速度のゼロ点を合わせ、前記曲率の距離微分値のピーク点に前後加速度のピーク点を合わせて、前記速度指令値を生成することを特徴とする車両運動制御装置。 - 請求項2に記載の車両運動制御装置において、
前記走行速度生成部は、前記経路の特徴点間で前後加速度と前後加加速度が規定値内で最大となる速度指令値を生成し、
前記速度指令値で横加速度や横加加速度が規定値外となる場合は、減速開始点を距離軸上で手前、または、加速終了点を距離軸上で奥にして速度指令値を生成することを特徴とする車両運動制御装置。 - 請求項2に記載の車両運動制御装置において、
前記走行速度生成部は、前記経路の特徴点間で前後加速度と前後加加速度が規定値内で最大となる速度指令値を生成し、
前記速度指令値で横加速度や横加加速度が規定値内となる範囲内で、前後加速度のピーク点の位置を距離軸上で手前または奥にして速度指令値を生成することを特徴とする車両運動制御装置。 - 請求項1に記載の車両運動制御装置において、
前記走行速度生成部は、前記経路の特徴点間で前後加速度と前後加加速度が規定値内で最大となる速度指令値を生成し、
前記速度指令値で横加速度や横加加速度が規定値内となる場合は、前記曲率のピーク点に前記前後加速度のゼロ点を合わせないことを特徴とする車両運動制御装置。 - 請求項1に記載の車両運動制御装置において、
前記走行速度生成部は、
上位コントローラから出力されるフラグが処理許可である場合に前記速度指令値を生成し、
上位コントローラから出力されるフラグが処理禁止である場合に前記速度指令値を生成しないことを特徴とする車両運動制御装置。 - 請求項1から請求項6の何れか一項に記載の車両運動制御装置において、
前記経路特徴点設定部は、
前記経路の曲率のピーク、またはゼロより大きい曲率の変曲点を曲率ピーク点に設定し、
前記曲率の距離微分値、または曲率がゼロからあるいは曲率がゼロに変化する変曲点と前記曲率ピーク点の中間の点を曲率の距離微分値のピーク点に設定するすることを特徴とする車両運動制御装置。 - 請求項1から請求項6の何れか一項に記載の車両運動制御装置において、
前記規定値設定部は、車両の乗員や積み荷の、質量や大きさや配置や、車両が走行する経路の状態に基づいて規定値を設定することを特徴とする車両運動制御装置。 - 車両が走行する経路を生成する経路計画ステップと、
前記経路を走行する際の車両挙動の物理量の規定値を設定する規定値設定ステップと、 前記経路と前記規定値に基づいて経路特徴点を設定する経路特徴点設定ステップと、
前記経路と前記規定値と前記経路特徴点に基づいて前記車両が前記経路を走行するための速度指令値を生成する走行速度生成ステップを備え、
前記走行速度生成ステップでは、
前記経路の曲率のピーク点である経路特徴点に基づいて前後加速度のゼロ点を設定し、 前記曲率の距離微分値のピーク点である経路特徴点に基づいて前後加速度のピーク点を設定することを特徴とする車両運動制御方法。
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