Vehicle motion control device and vehicle motion control method

Abstract

To provide a vehicle motion control device capable of suppressing deterioration in the ride comfort during the turning travel of a vehicle.SOLUTION: A vehicle motion control device includes: an information acquisition unit which acquires information about a curved section ahead of a vehicle; a turning control planning unit which plans turning control that controls the posture of the vehicle when the vehicle travels the curved section on the basis of the information about the curved section; and a notification control planning unit which plans notification control that controls the posture of the vehicle before executing the turning control and that notifies occupants in the vehicle in advance of the execution of the turning control. The turning control is planned to be continuous after the notification control. The notification control planning unit plans the notification control such that a peak of a time change rate of a physical quantity related to the posture of the vehicle is positioned between the start time of the notification control and the start time of the turning control.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle motion control device and a vehicle motion control method. [Background technology]

[0002] Patent Document 1 is known as a technology for assisting a vehicle in turning. The abstract of the document states, "In the vehicle control device 1, the curvature detection unit 36 ​​detects the curvature of the curve ahead of the vehicle. The target roll angle acquisition unit 26 acquires the target roll angle of the vehicle. The target vehicle speed calculation unit 28 calculates the target vehicle speed of the vehicle when entering the curve based on the curvature and the target roll angle. The braking force generation unit 32 generates a braking force on the vehicle so as to decelerate the vehicle to the target vehicle speed when entering the curve." [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-5658 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology in this document does not allow the occupant to know in advance the changes in pitch angle and roll angle of the vehicle that occur when the vehicle is turning, and therefore the occupant cannot assume a posture that is prepared for the changes in pitch angle and roll angle of the vehicle that occur when the vehicle is turning, resulting in a problem that the ride comfort during turning is deteriorated.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a vehicle motion control device and a vehicle motion control method that can suppress deterioration of ride comfort when the vehicle is cornering. [Means for solving the problem]

[0006] In order to solve the above problem, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problem, and for example, the vehicle motion control device of the present invention includes an information acquisition unit that acquires information on a curved section ahead of the vehicle, a turning control planning unit that plans turning control for controlling the attitude of the vehicle when the vehicle travels on the curved section based on the information on the curved section, and a notification control planning unit that controls the attitude of the vehicle before the execution of the turning control and plans a notification control for notifying an occupant of the vehicle in advance of the execution of the turning control, the turning control is planned to be continuous with the notification control, and the notification control planning unit plans the notification control so that a peak of a time rate of change of a physical quantity related to the attitude of the vehicle is located between a start time of the notification control and a start time of the turning control.

[0007] Also, for example, the vehicle motion control method of the present invention includes an information acquisition step of acquiring information about a curved section, a turning control planning step of planning turning control based on the information about the curved section, which controls the attitude of the vehicle when the vehicle travels around the curved section, and a notification control planning step of planning a notification control that controls the attitude of the vehicle before the turning control is executed and notifies occupants of the vehicle in advance of the execution of the turning control, wherein the turning control is planned to be continuous with the notification control, and in the notification control planning step, the notification control is planned so that a peak of the time rate of change of a physical quantity related to the attitude of the vehicle occurs between the start time of the notification control and the start time of the turning control. Effect of the Invention

[0008] According to the present invention, it is possible to provide a vehicle motion control device and a vehicle motion control method that can suppress deterioration of ride comfort when the vehicle is cornering. Problems, configurations, and effects other than those described above will become apparent from the description of the following embodiments. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view showing an example of the configuration of a vehicle according to a first embodiment. [Diagram 2]1 is a configuration diagram showing an arrangement of main components and functions of a vehicle motion control system according to a first embodiment. [Diagram 3] FIG. 4 is a diagram showing a vehicle travel route used in the operation explanation. [Figure 4] FIG. 4 is a diagram showing the time change of basic vehicle behavior without the control of the present invention. [Diagram 5] FIG. 2 is a diagram showing the operation of the vehicle motion control device. [Figure 6] 5A and 5B are diagrams showing vehicle behavior when pitch angle control is performed. [Figure 7] 5 is a diagram showing a specific example of a change in a target pitch angle over time. [Figure 8] FIG. 4 is a diagram showing an example of the relationship between the distribution of driving force to the front and rear wheels and the pitching moment. [Figure 9] 4 is a flowchart illustrating the mechanism by which the occupant is shaken during cornering, causing the ride comfort to deteriorate. [Figure 10] 4 is a flowchart illustrating a mechanism by which deterioration of ride comfort during cornering is suppressed according to the present invention. [Figure 11] 4A and 4B are diagrams illustrating control of pitch angle and roll angle. [Figure 12] 13 is a diagram showing an example in which the magnitude of the peak of the time rate of change of the pitch angle is set small. FIG. [Figure 13] FIG. 13 is a diagram showing an example in which the magnitude of the peak of the time rate of change of the pitch angle is set large. [Figure 14] 6A and 6B are diagrams illustrating setting of a time width of a convex shape including a peak of the time rate of change of a pitch angle. [Figure 15] 11 is a diagram showing a case where attitude control of a roll angle is performed based on a vehicle behavior before the start of attitude control. [Figure 16] FIG. 13 is a diagram showing an example in which there are two peaks in the time rate of change of the pitch angle. [Figure 17] FIG. 11 is a plan view showing a configuration example of a vehicle according to a second embodiment. [Figure 18] FIG. 11 is a configuration diagram showing an arrangement of main components and functions of a vehicle motion control system according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a vehicle motion control device according to the present invention will be described with reference to the drawings. EXAMPLES

[0011] Fig. 1 is a plan view showing a configuration example of a vehicle equipped with a vehicle motion control device of this embodiment. Vehicle 1 is a passenger car that carries passengers and travels on a road, and is, for example, a type having a size of 4.8 meters in the front-rear direction (x-axis direction in Fig. 1), 1.8 meters in the lateral direction (y-axis direction in Fig. 1), and 1.7 meters in height (z-axis direction in Fig. 1), and has four wheels 8FL, 8FR, 8RL, and 8RR.

[0012] FIG. 1 shows a schematic configuration of the onboard equipment of the vehicle 1. The vehicle motion control device 2, the vehicle state sensor 3, and the advanced driving assistance system ECU 12A are electronic devices that perform necessary calculations from information from the connected sensors and the in-vehicle network 9, and output the calculation results to the in-vehicle network 9. The accelerator pedal device 4, the brake pedal device 5P, and the steering wheel device 6A are devices that detect operations from the driver, are installed at the driver's seat, and output the detected information to the in-vehicle network 9. The front e-axle 7F and the rear e-axle 7R are mounted as actuators (wheel drive units) that drive the vehicle 1. These are integrated with an inverter, a motor, a reduction gear, and a differential device, and generate torque that rotates the axles from the torque generated by the motor. The motor, which is the driving force source, can generate driving force and braking force for the vehicle 1. The actuator (steering angle control unit) that steers the wheels of the vehicle 1 is mounted with a steering rack actuator 6B, and can steer the front wheels to the left and right. Among the above-mentioned on-board devices, those that need to communicate with other devices are connected to an in-vehicle network 9, and each device is capable of sending and receiving information. Note that only the on-board devices of the vehicle 1 in Fig. 1 that are necessary for explaining the operation of this embodiment are shown, and other devices are not shown. Furthermore, even with regard to the devices shown in the figure, power lines and other devices that are not necessary for explaining the operation of this embodiment are not shown.

[0013] FIG. 2 shows the layout of the main components and functions of the vehicle motion control system. The advanced driving assistance system ECU 12A grasps the current position and speed of the vehicle. It also has map information around the vehicle, and calculates curvature radius data for the future travel of the vehicle, that is, curvature radius data of roads that the vehicle will pass through from the current time to a predetermined time ahead, from the map information. The curvature radius data is a matrix data of elapsed time from the current time and curvature radius, and in this embodiment, data for up to 10 seconds ahead is calculated and recorded at 300 ms intervals. The advanced driving assistance system ECU 12A transmits this curvature radius data to the in-vehicle network 9. The curvature radius data is an example of information on a curved section in front of the vehicle, and the following description will be given using the curvature radius data, but is not limited to this.

[0014] The vehicle state sensor 3 acquires current vehicle motion information, such as longitudinal acceleration, lateral acceleration, yaw rate, pitch angle, and roll angle, using internal sensors, and transmits the information as vehicle motion information to the in-vehicle network 9 after performing necessary noise removal processing. The accelerator pedal device 4 detects the amount of pedal depression and transmits this as the accelerator opening to the in-vehicle network 9. The brake pedal device 5P detects the brake pedal depression force and transmits this as the brake depression force to the in-vehicle network 9. The steering wheel device 6A detects the rotational position of the steering wheel and transmits this as the steering wheel angle to the in-vehicle network 9.

[0015] The vehicle motion control device 2 is roughly composed of a vehicle attitude planning section 2A and a vehicle motion control section 2B.

[0016] The vehicle attitude planning unit 2A plans attitude control for suppressing deterioration of the ride comfort. Here, in this embodiment, the pitch angle is controlled as the attitude control for suppressing deterioration of the ride comfort. The attitude control start determination unit 2A1 in the vehicle attitude planning unit 2A acquires curvature radius data, and determines whether or not the vehicle will start turning from the curvature radius data after the current time. In this embodiment, the attitude control start determination unit 2A1 functions as an information acquisition unit that acquires curvature radius data, but an information acquisition unit may be provided separately. The lateral acceleration calculation unit 2A2 calculates the lateral acceleration (hereinafter abbreviated as "lateral acceleration") generated in the vehicle 1 from the curvature radius data and the vehicle speed. The estimated pitch angle calculation unit 2A3 (estimated physical quantity calculation unit) calculates the pitch angle generated in the vehicle 1 as an estimated pitch angle based on the lateral acceleration generated in the vehicle 1. The target pitch angle planning unit 2A4 (target physical quantity planning unit) plans the target physical quantity so that the target physical quantity representing the physical quantity to be realized in the vehicle 1 changes before the estimated physical quantity. When the attitude control start determination unit 2A1 determines that attitude control should be started, the vehicle attitude planning unit 2A outputs the target pitch angle planned by the target pitch angle planning unit 2A4 to the vehicle motion control unit 2B.

[0017] The vehicle motion control unit 2B calculates the output command to the actuator that drives the vehicle 1. The vehicle motion control unit 2B obtains the above-mentioned curvature radius data, vehicle motion information, accelerator opening, brake pedal force, and steering angle information from the in-vehicle network 9, and calculates the basic driving force and basic steering amount from these. Next, the pitching moment required to control the vehicle 1 to the target pitch angle of the posture control calculated by the vehicle attitude planning unit 2A is calculated. The front and rear wheel driving force distribution required to generate the calculated pitching moment and the steering amount to correct the vehicle behavior disturbed due to the distribution change are calculated, and these results are added to the basic driving force and basic steering amount, and calculated and output as a front wheel driving force command to the front e-axle 7F, a rear wheel driving force command to the rear e-axle 7R, and a steering amount command to the steering rack actuator 6B. The vehicle motion control device 2 performs other corrections necessary for the motion control of the vehicle 1 from the output of the vehicle motion control unit 2B, and then transmits it to the in-vehicle network 9 as the final output.

[0018] The front e-axle 7F receives a front wheel drive force command from the in-vehicle network 9 and adjusts the motor torque to drive the front wheels.

[0019] The rear e-axle 7R receives rear wheel drive force commands from the in-vehicle network 9 and adjusts the motor torque to drive the rear wheels.

[0020] The steering rack actuator 6B is configured to receive a steering amount command from the in-vehicle network 9, adjust the motor torque that operates the rack shaft, and determine the steering angle of the front wheels. Next, an operation of the vehicle configured as described above to suppress deterioration of the ride comfort will be described.

[0021] FIG. 3 is a diagram showing an example of a travel route of the vehicle 1 used to explain the operation. The vehicle 1 is traveling at a speed of 11 m / s at the position shown in the figure. The drivable area is between the left end 20L and the right end 20R of the road ahead. The road curves to the left where the vehicle 1 is traveling. The radius of curvature of the road center line is, for example, 30 m. When traveling on this road, the vehicle 1 starts steering the front wheels from a turning control start position 20S, gradually starts turning, travels with a constant curvature radius with a constant amount of steering, then gradually reduces the amount of steering, and returns to straight traveling at a turning control end position 20E.

[0022] Fig. 4 shows a graph of the basic vehicle behavior over time without the control of the present invention when traveling along the travel route in Fig. 3. The graph shows, from top to bottom, the steering angle, lateral acceleration, roll angle, and pitch angle. The solid line at 10 seconds is the turning control start time 21S at which the vehicle passes through the turning control start position 20S, and the solid line at 13 seconds is the turning control end time 21E at which the vehicle passes through the turning control end position 20E. First, the steering angle gradually increases between 10 and 11 seconds, remains constant between 11 and 12 seconds, and gradually decreases between 12 and 13 seconds. The lateral acceleration, roll angle, and pitch angle appear in similar waveforms slightly behind the steering angle. Here, the pitch angle occurs when the vehicle 1 is subjected to longitudinal acceleration. In this driving example, no longitudinal acceleration is generated by driving force or the like. However, when the wheels generate lateral force when steering to make a turn, the rotation plane of the wheel has an angle (slip angle) with respect to the direction of travel of the vehicle 1, and therefore the lateral force generated by the wheel also has a longitudinal component (cornering resistance) of the vehicle. This force generates longitudinal acceleration, resulting in pitch motion as shown in the figure.

[0023] FIG. 5 is an example of a flowchart showing the operation of the vehicle motion control device according to this embodiment. In the curvature radius data receiving step S1, the posture control start determining unit 2A1 receives the curvature radius data from the advanced driving assistance system ECU 12A via the in-vehicle network 9. Next, in the curvature radius change extracting step S2, the posture control start determining unit 2A1 observes the change in the curvature radius from the current time to a predetermined time ahead based on the curvature radius data, and extracts, for example, the presence or absence of a turning section (for example, a section with a curvature radius of 50 or less), the duration of the turning section (i.e., the time it takes for the vehicle 1 to pass through the turning section), and the time from the current time to entering the turning section. Next, in the posture control start determining step S3, the posture control start determining unit 2A1 determines whether or not to start posture control based on the information extracted in the curvature radius change extracting step S2. If the determination is "not to start," the process returns to the curvature radius data receiving step S1. If the determination is "to start," the process proceeds to the lateral acceleration calculation step S4. The posture control start determination unit 2A1 determines to "start" when, for example, there is a turning section that the vehicle will enter in 1 second from the current time and the time it takes for the vehicle to pass through the turning section is 2 seconds or more. The start position of the posture control is, for example, the posture control start position 20P shown in FIG.

[0024] In the lateral acceleration calculation step S4, the lateral acceleration calculation unit 2A2 calculates the lateral acceleration (lateral acceleration) of the vehicle 1 when traveling with a constant radius of curvature from the current time to a predetermined time ahead based on the radius of curvature data and the vehicle speed. Note that the vehicle speed is preset according to the radius of curvature.

[0025] In the estimated pitch angle calculation step S5, the estimated pitch angle calculation unit 2A3 calculates the pitch angle predicted to occur when traveling with a constant radius of curvature based on the lateral acceleration as the estimated pitch angle. The estimated pitch angle calculation unit 2A3 calculates the centrifugal force acting on the vehicle 1 from the lateral acceleration calculated in the lateral acceleration calculation step S4, for example, and calculates a cornering force that balances the centrifugal force. Then, based on a graph showing the relationship between the lateral force and the slip angle obtained in advance, a slip angle that can generate the calculated cornering force is obtained. The cornering force is equal to the lateral force × sin (slip angle × π / 180). Then, the cornering resistance is calculated from the cornering force and the slip angle. After that, the pitch angle is calculated from the acceleration in the longitudinal direction of the vehicle 1 generated by the cornering resistance.

[0026] In target pitch angle planning step S6, the target pitch angle planning unit 2A4 plans the target pitch angle so that the target pitch angle, which represents the pitch angle to be realized by the vehicle 1, changes prior to the estimated pitch angle. Specifically, the target pitch angle planning unit 2A4 plans the target pitch angle so that the peak of the time rate of change of the target physical quantity is positioned between the start time (21P) of the attitude control and the start time (21S) of the turning control.

[0027] In the vehicle motion control step S7, the vehicle motion control section 2B adjusts the command to the actuator to control the vehicle attitude so as to achieve the planned target pitch angle.

[0028] In the turning completion determination step S8, the posture control start determination unit 2A1 determines whether the turning is completed based on the curvature radius data. The vehicle motion control device 2 continues the vehicle motion control step S7 until the turning completion determination is made, and returns to the curvature radius data receiving step S1 when the turning completion determination is made.

[0029] Figure 6 shows a graph of the change over time in vehicle behavior when pitch angle control is performed while traveling along the travel route in Figure 3. The graph shows, from top to bottom, steering angle, lateral acceleration, roll angle, and pitch angle. Here, the steering angle, lateral acceleration, and roll angle are the same as in Figure 4 when control is not performed, but the pitch angle TPA when pitch angle control is performed begins to change from the attitude control start time 21P. For comparison, the pitch angle PA when control is not performed is shown by a dashed line. In this way, attitude control begins at an earlier timing than the start of turning control.

[0030] FIG. 7 shows a specific example of the time change of the target pitch angle when traveling along the travel route of FIG. 3. The vertical axis of the graph is the pitch angular velocity and the pitch angle from the top. In the upper figure, the pitch angular velocity PAV when no control is performed is shown by a dashed line, and the pitch angular velocity TPAV when control is performed is shown by a solid line. In the lower figure, the pitch angle PA when no control is performed is shown by a dashed line, and the pitch angle TPA when control is performed is shown by a solid line. Note that the pitch angle PA is an estimated pitch angle calculated based on the lateral acceleration, and the pitch angle TPA is a target pitch angle that changes prior to the pitch angle PA. Specifically, the target pitch angle planning unit 2A4 starts changing the pitch angle TPA, which is the target pitch angle, from the attitude control start time 21P, and plans the pitch angular velocity TPAV, which is the time rate of change of the target pitch angle, to have a peak between the attitude control start time 21P and the turning control start time 21S. This is because the purpose of the attitude control that starts prior to the turning control is to inform the occupant that a turn will soon be made, and the time change rate is increased to ensure that the occupant is aware of this. It is desirable to set the peak of the pitch angular velocity TPAV in the first half of the period from the attitude control start time 21P to the turning control start time 21S. This ensures a period of time between notifying the occupant that a turn will be made and the start of the turn, and allows the occupant to reliably prepare for the turn.

[0031] As for a method of controlling the pitch angle by adjusting the driving force, an example of the relationship between the driving force distribution to the front and rear wheels and the pitching moment is shown in Fig. 8. In order to control the pitch angle change so that a peak occurs, it is necessary to adjust the pitching moment acting on the vehicle. In this embodiment, the pitching moment is generated and the pitch angle is controlled by changing the driving force distribution by utilizing the relationship between the change in the driving force distribution ratio, which is a characteristic of the vehicle shown in Fig. 8, and the magnitude of the pitching moment.

[0032] Next, the mechanism by which the ride comfort of the passengers deteriorates due to cornering will be explained using FIG. 9, and then the mechanism by which the attitude control prior to cornering suppresses the deterioration of the ride comfort of the passengers using FIG. 10.

[0033] Fig. 9 is a flow chart showing the mechanism by which the occupant is shaken during cornering, resulting in a deterioration in ride comfort. This corresponds to the case where there is no vehicle attitude control before cornering. First, when the vehicle starts to turn (step S11), lateral acceleration is then applied to the occupant (step S12). However, the occupant cannot react to the lateral acceleration in time (step S13), so the occupant's body is shaken by the lateral acceleration (step S14). As a result, the occupant's ride comfort deteriorates (step S15).

[0034] FIG. 10 is a flow chart showing a mechanism by which the deterioration of the ride comfort during cornering is suppressed by the present invention. Here, the vehicle attitude control is started by the control before cornering (step S20), and in this embodiment, the change of the pitch angle is started. Next, the occupant senses the change in attitude and prepares for cornering mainly unconsciously (step S21), after which the vehicle starts turning (step S22), and the occupant is subjected to lateral acceleration (step S23). Here, since the occupant is prepared for cornering, he or she smoothly deals with the lateral acceleration (step S24). The deal is, for example, tensing the muscles that support the body and stiffening the body. Next, because of the above-mentioned deal, the amount of shaking of the occupant's body is reduced (step S25). As a result, the deterioration of the ride comfort of the occupant is suppressed (step S26).

[0035] Through the above operations, a vehicle motion control device can be provided that encourages occupants to prepare for cornering by performing pitch angle control earlier than the start of a turn, thereby preventing occupants from being shaken during cornering and reliably suppressing a deterioration in ride comfort.

[0036] FIG. 11 is a diagram for explaining the control of the pitch angle and the roll angle. In this embodiment, an example of controlling the pitch angle as the attitude control is shown, but as shown in FIG. 11, the roll angle or both the pitch angle and the roll angle may be controlled. For example, depending on the driving conditions of the vehicle, the pitch angle may be very small during turning. In such a case, even if the pitch angle control is performed at an early timing, the amount of change is small, so it is difficult for the occupant to feel the change in the pitch angle. In such a case, the roll angle may be changed as an attitude change to prompt the occupant to prepare for turning. In addition, when controlling the roll angle, it is not necessary to stop the control of the pitch angle, and both the pitch angle and the roll angle may be controlled as shown in FIG. 11.

[0037] FIG. 12 is a diagram showing an example in which the peak magnitude PEAK of the time rate of change of the pitch angle is set small. FIG. 13 is a diagram showing an example in which the peak magnitude PEAK of the time rate of change of the pitch angle is set large. An example in which the pitch angle is controlled so as to have a peak between the attitude control start time 21P and the turning control start time 21S has been shown, but the peak magnitude PEAK may be adjusted based on the pitch angle fluctuation amount AMP when going straight, which is the vehicle behavior before the attitude control starts, as shown in FIG. 12. FIG. 12 shows a case in which the pitch angle fluctuation amount AMP when going straight, which is the vehicle behavior before the attitude control starts, is small and the peak magnitude PEAK is set small, and FIG. 13 shows a case in which the pitch angle fluctuation amount AMP when going straight, which is the vehicle behavior before the attitude control starts, is large and the peak magnitude PEAK is set large. For example, the peak magnitude PEAK is set to be twice or more the pitch angle fluctuation amount AMP when going straight, which is the vehicle behavior before the attitude control starts.

[0038] FIG. 14 is a diagram for explaining the setting of the time width W of the convex shape including the peak of the time rate of change of the pitch angle. As shown in FIG. 14, the time width W of the convex shape including the peak may be adjusted based on the change period T of the pitch angle when traveling straight, which is the vehicle behavior before the start of the attitude control. For example, the time width W of the convex shape including the peak is set to be 1 / 2 or less of the change period T of the pitch angle when traveling straight, which is the vehicle behavior before the start of the attitude control. Also, as shown in FIG. 12 and FIG. 13, the magnitude PEAK of the peak may be set based on the pitch angle fluctuation amount AMP when traveling straight, which is the vehicle behavior before the start of the attitude control, and as shown in FIG. 14, the time width W of the convex shape including the peak may be set based on the change period T of the pitch angle when traveling straight, which is the vehicle behavior before the start of the attitude control.

[0039] In addition, in FIG. 15, when deceleration is started from deceleration start time 21D as the vehicle behavior before the start of attitude control and the pitch angle is already a large value, the roll angle may be controlled in addition to the pitch angle.

[0040] Fig. 16 is a diagram showing an example in which the time rate of change of the pitch angle has two peaks. As shown in Fig. 16, the time rate of change of the pitch angle may have two peaks (TPAV1, TPAV2). Note that the time rate of change of the pitch angle may have three or more peaks.

[0041] The vehicle attitude planning unit 2A described above functions as both a turning control planning unit and a notification control planning unit. The attitude control planned by the vehicle attitude planning unit 2A includes turning control and notification control. Here, the turning control is to control the attitude of the vehicle when the vehicle runs on a curved section. The notification control is to control the attitude of the vehicle before the turning control is executed and to notify the vehicle occupants of the execution of the turning control in advance. The plan of the attitude control from the attitude control start time 21P (the start time of the notification control) to the turning control start time 21S shown in FIG. 6 corresponds to the plan of the notification control, and the plan of the attitude control from the turning control start time 21S to the turning control end time 21E corresponds to the plan of the turning control. 7, for example, the pitch angle TPA and pitch angular velocity TPAV from the attitude control start time 21P to the turning control start time 21S correspond to the plan for the notification control, and the pitch angle TPA and pitch angular velocity TPAV from the turning control start time 21S to the turning control end time 21E (not shown) correspond to the plan for the turning control. Note that the configuration of this embodiment is just an example, and a configuration may be provided with both the turning control planning unit and the notification control planning unit.

[0042] As described above, by adjusting the control target and the size of the peak of the posture control performed earlier than the start of cornering, as well as the width and number of the peaks, it is possible to provide a vehicle motion control device that prevents the posture control performed earlier than the start of cornering from being obscured by vehicle behavior, reliably prompts occupants to prepare for cornering, and suppresses deterioration of ride comfort by suppressing shaking of occupants during cornering. EXAMPLES

[0043] FIG. 17 also shows a plan view illustrating a configuration example of a vehicle 1B of the second embodiment. Here, differences from the vehicle 1 of FIG. 1 will be described. The vehicle 1B of FIG. 17 does not have a driver's seat and is a vehicle that runs by automatic driving. For this reason, an automatic driving system ECU 12B is installed. In addition, in-wheel motors 7FL, 7FR, 7RL, and 7RR are installed for each wheel as actuators for running the vehicle. Since these motors are the driving force sources, the driving force and braking force of the vehicle can be generated independently for each wheel. As actuators for steering the wheels, a front steering rack actuator 6BF for steering the front wheels and a rear steering rack actuator 6BR for steering the rear wheels are installed, and the front wheels and the rear wheels can be steered to the left and right, respectively. As actuators for generating braking force for the vehicle, brake units 5FL, 5FR, 5RL, and 5RR are installed for each wheel. These are electric calipers and can independently control the braking force of each wheel. Each wheel is equipped with active suspensions 10FL, 10FR, 10RL, and 10RR as actuators that apply vertical force to the wheels. These are electromagnetic and generate vertical thrust in response to commands. The front and rear wheels are equipped with active anti-roll bars 11F and 11R as actuators that adjust the vehicle's roll rigidity. These are electrically operated and can change the amount of twist in response to commands, thereby changing the vehicle's roll rigidity.

[0044] FIG. 18 is a configuration diagram showing the arrangement of main components and functions of the vehicle motion control system of the vehicle 1B of FIG. 17. The vehicle 1B is configured to have no operating device such as an accelerator pedal device, and the automatic driving control unit in the automatic driving system ECU 12B generates information required for driving the vehicle. According to the configurations of the vehicle and the vehicle motion control system shown in FIGS. 17 and 18, a vehicle motion control device can be provided that can prompt the occupants to prepare for turning by performing attitude control earlier than the start of turning in an automatic driving vehicle, suppress the occupants from being shaken during turning, and reliably suppress the deterioration of the ride comfort. In addition, regarding the actuator of the vehicle, since it is possible to bias the wheels in the vertical direction, change the roll rigidity, and steer the front and rear wheels, it is possible to perform more accurate attitude control, and the controllable attitude can be adjusted not only for roll and pitch angles but also for yaw angle and heave, and it is possible to provide a vehicle motion control device that can prompt the occupants to prepare for turning more reliably by considering the vehicle behavior of the vehicle at that time, and suppress the occupants from being shaken during turning, and reliably suppress the deterioration of the ride comfort.

[0045] The present invention is not limited to the above-described embodiment, but includes various modified examples. For example, the above-described embodiment has been described in detail to easily explain the present invention, and the present invention is not necessarily limited to the embodiment having all of the described configurations.

[0046] In addition, the control lines and information lines shown are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it can be considered that almost all components are connected to each other. [Explanation of symbols]

[0047] 1, 1B...vehicle, 2...vehicle motion control device, 2A...vehicle attitude planning unit, 2A1...attitude control start determination unit, 2A2...lateral acceleration calculation unit, 2A3...estimated pitch angle calculation unit (estimated physical quantity calculation unit), 2A4...target pitch angle planning unit (target physical quantity planning unit), 2B...vehicle motion control unit, 6B...steering rack actuator, 7F...front e-axle, 7R...rear e-axle, 12A...advanced driving assistance system ECU, 12B...autonomous driving system ECU, 21E...turning control end time, 21P...attitude control start time (notification control start time), 21S...turning control start time

Claims

1. an information acquisition unit that acquires information about a curved section ahead of the vehicle; a turning control planning unit that plans turning control for controlling the attitude of the vehicle when the vehicle travels on the curved section based on information about the curved section; a notification control planning unit that controls an attitude of the vehicle before the execution of the turning control and plans a notification control for notifying an occupant of the vehicle in advance of the execution of the turning control, The turning control is scheduled to be continuous with the notification control, A vehicle motion control device characterized in that the notification control planning unit plans the notification control so that a peak of the time rate of change of a physical quantity related to the attitude of the vehicle occurs between the start time of the notification control and the start time of the turning control.

2. The vehicle motion control device according to claim 1, The vehicle motion control device, wherein the notification control planning unit sets a magnitude of a peak of a time rate of change of the physical quantity based on an amount of fluctuation of the physical quantity prior to a start time of the notification control.

3. The vehicle motion control device according to claim 1, The vehicle motion control device according to the present invention, characterized in that the notification control planning unit sets a peak of the time rate of change of the physical quantity in the first half of the period from the start time of the notification control to the start time of the turning control.

4. The vehicle motion control device according to claim 1, The vehicle motion control device is characterized in that the notification control planning unit sets a time width of a convex shape including a peak of the time change rate of the physical quantity based on a change period of the physical quantity prior to a start time of the notification control.

5. The vehicle motion control device according to claim 1, the physical quantity is at least one of a pitch angle and a roll angle, 2. A vehicle motion control device, comprising: a vehicle motion control unit for controlling a vehicle motion according to claim 1, wherein the physical quantity is selected based on a pitch angle and a roll angle prior to a start time of the notification control.

6. The vehicle motion control device according to claim 1, A vehicle motion control device, characterized in that the time rate of change of the physical quantity has two or more peaks.

7. A vehicle motion control device according to any one of claims 1 to 6, A vehicle motion control device that is installed in an autonomous vehicle that can automatically drive the vehicle based on information from the outside world and inside the vehicle.

8. An information acquisition step of acquiring information on a curved portion; a turning control planning step of planning turning control for controlling the attitude of the vehicle when the vehicle travels on the curved section based on information about the curved section; a notification control planning step of controlling an attitude of the vehicle before the execution of the turning control and planning a notification control for notifying an occupant of the vehicle in advance of the execution of the turning control, The turning control is scheduled to be continuous with the notification control, A vehicle motion control method characterized in that, in the notification control planning step, the notification control is planned so that a peak in the time rate of change of a physical quantity related to the attitude of the vehicle occurs between the start time of the notification control and the start time of the turning control.

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