JP2011207286A - Control device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a vehicle enabling improvement of turning performance of a vehicle.SOLUTION: When vehicle speed in a turning degree increase period exceeds a US limit value and there is a possibility that a steering characteristic becomes under-steering, camber angles of turning inner wheels of right and left rear wheels 2RL and 2RR are adjusted in a negative camber direction to be larger than the camber angles of the turning outer wheels and thereby camber thrust generated in the turning inner wheels of the right and left rear wheels 2RL and 2RR is made larger than that generated in the turning outer wheels and yaw moment for setting the steering characteristic to an over-steering tendency can be acted on the vehicle 1. As a result, under-steering can be suppressed.

Description

  The present invention relates to a vehicle control device used in a vehicle including a camber angle adjusting device for adjusting a camber angle of a wheel, and more particularly to a vehicle control device capable of improving the turning performance of the vehicle.

  Conventionally, a technique for improving the turning performance of a vehicle by adjusting the camber angle of a wheel according to the traveling state of the vehicle is known. With regard to this type of technology, for example, Patent Document 1 discloses a technology for improving the limit performance of a vehicle during cornering by giving a negative camber to a wheel at a predetermined vehicle speed or higher.

JP-A-60-193781

  However, in the technique disclosed in Patent Document 1 described above, even during cornering, if the vehicle speed is high, a negative camber is applied to the wheel. However, if the vehicle speed is low, a negative camber is not applied to the wheel, and the wheel is negative. There is a problem in that the steering characteristic is different between when the camber is applied and when the camber is not applied, which is insufficient to improve the turning performance of the vehicle.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle control device that can improve the turning performance of the vehicle.

Means for Solving the Problems and Effects of the Invention

  According to the vehicle control device of the first aspect, when the turning start determining means determines that the state of the vehicle has changed from the straight traveling state to the turning state, the increase period vehicle speed determining means sets the vehicle speed of the vehicle to a predetermined threshold value. It is judged whether it has exceeded. When the increase period vehicle speed determination means determines that the vehicle speed exceeds a predetermined threshold, the increase period camber adjustment means activates the camber angle adjustment device, so that the left and right rear wheels turn inner wheels. Positive camber direction so that the camber angle is adjusted in the negative camber direction so that it is larger than the camber angle of the turning outer wheel, or the camber angle of the left and right rear turning outer wheels is larger than the camber angle of the turning inner wheel Adjusted to As a result, when the vehicle speed in the period when the turning degree increases exceeds a predetermined threshold and the steer characteristic may be understeer, the camber angle of the turning inner wheel of the left and right rear wheels is made larger than the camber angle of the turning outer wheel. By adjusting to the negative camber direction, the canvas last generated on the left and right rear turning inner wheels is made larger than the canvas last generated on the turning outer wheels, and the yaw moment to make the steering characteristics oversteer tends to be given to the vehicle. Can act. Similarly, by adjusting the camber angle of the left and right rear wheels to the positive camber direction so that it is larger than the camber angle of the inner wheels, the canvas last generated on the left and right rear wheels can be turned into the inner wheels. It is possible to apply a yaw moment to the vehicle so as to make the steering characteristic oversteer tendency by making it larger than the generated canvas last. Therefore, understeer can be suppressed. At the same time, it is possible to improve the turnability of the turning degree increasing period.

  Further, according to the vehicle control device of the first aspect, the maintenance period transition determining means determines that the turning state of the vehicle has transitioned from the increasing period in which the degree of turning increases to the maintenance period in which the turning degree is maintained. In this case, the deceleration determination means determines the deceleration state of the vehicle. When the deceleration determination means determines that the vehicle has decelerated, the camber angle adjustment device is operated by the maintenance period camber adjustment means, and the left and right rear turning inner wheels adjusted by the increase period camber adjustment means or The camber angle of the turning outer wheel is adjusted so that the absolute value becomes at least small. Thereby, although the vehicle speed in the turning degree increasing period has exceeded a predetermined threshold value, when the vehicle subsequently decelerates, the yaw moment applied to the vehicle in the turning degree increasing period can be reduced. Therefore, there is an effect that it is possible to avoid the occurrence of oversteering by avoiding the tendency of the steer characteristic to continue to be oversteered after the turning degree is increased even though the understeer is eliminated.

  Further, according to the vehicle control device of the first aspect, it is determined by the decrease period transition determining means that the turning state of the vehicle has transitioned from the maintenance period in which the turning state is maintained at the predetermined turning degree to the decreasing period in which the turning degree decreases. In this case, it is determined whether the vehicle speed of the vehicle exceeds a predetermined threshold by the decrease period vehicle speed determination means. If the vehicle speed of the vehicle is determined to exceed the predetermined threshold by the decrease period vehicle speed determination means, the camber angle adjustment device is operated by the decrease period camber adjustment means, and the turning inner wheels of the left and right rear wheels are operated. The camber angle is adjusted so that the absolute value is increased and adjusted in the negative camber direction so that it is larger than the camber angle of the turning outer wheel, or the camber angle of the turning outer wheel of the left and right rear wheels is increased in absolute value. Thus, the positive camber direction is adjusted to be larger than the camber angle of the turning inner wheel. As a result, the vehicle decelerated during the turning degree maintenance period, but the vehicle speed during the turning degree reduction period exceeds a predetermined threshold, and the steering characteristic may become understeer. By adjusting the camber angle so that the absolute value becomes larger and adjusting it toward the negative camber direction so that it is larger than the camber angle of the turning outer wheel, the canvas last generated on the turning inner wheels of the left and right rear wheels is increased and turning is performed. The yaw moment can be applied to the vehicle so as to make the steer characteristic over-steer by making it larger than the canvas last generated in the outer ring. Similarly, turning the left and right rear wheels by adjusting the camber angle of the left and right rear wheels so that the absolute value of the outer camber angle is larger and adjusting the camber angle to be larger than the camber angle of the inner wheel. The canvas last generated on the outer ring can be increased and made larger than the canvas last generated on the turning inner ring, and a yaw moment for making the steer characteristic oversteer can be applied to the vehicle. Therefore, understeer can be suppressed.

  Thus, according to the vehicle control apparatus of the first aspect, there is an effect that the understeer can be suppressed and the oversteer can be prevented to improve the turning performance of the vehicle.

  According to the vehicle control device of the second aspect, in addition to the effect exerted by the vehicle control device of the first aspect, the turning start determination means determines whether the steering angle acquired by the steering angle acquisition means exceeds a predetermined value. Alternatively, when the time differential value of the steering angle obtained by the steering angle acquisition means exceeds a positive predetermined value, it is determined that the vehicle has changed from a straight traveling state to a turning state, and the maintenance period transition determining unit is When the time differential value of the steering angle acquired by the steering angle acquisition means is smaller than a positive predetermined value, it is determined that the turning state of the vehicle has transitioned from the increase period to the maintenance period, and the decrease period transition determination means is When the time differential value of the steering angle acquired by the steering angle acquisition means becomes smaller than the negative predetermined value, it is determined that the turning state of the vehicle has transitioned from the maintenance period to the decrease period. Judgment and maintenance period transition judgment The determination by the determination and the declining phase transition determining means by means, there is an effect that can be accurately performed based on the steering state of the actual vehicle.

  The steering angle acquired by the steering angle acquisition means is not limited to the so-called actual steering angle formed by the center plane of the wheel and the front and rear axes of the vehicle. For example, the driver may generate the actual steering angle. This includes the amount of operation of an operation member (steering or the like) operated by. The steering angle is based on the case where the vehicle is in a straight traveling state, and the steering angle when the vehicle is in a straight traveling state is set to zero.

  According to the vehicle control device of the third aspect, in addition to the effect produced by the vehicle control device according to the first or second aspect, the increase period threshold value acquisition means serves as a determination criterion for the determination by the increase period vehicle speed determination means. Since the threshold value is acquired based on the turning degree of the vehicle, the determination by the increasing period vehicle speed determining means can be performed according to the turning degree of the vehicle. Further, since the decrease period threshold value acquisition means acquires a threshold value as a determination criterion by the decrease period vehicle speed determination means based on the turning degree of the vehicle, the determination of the decrease period vehicle speed determination means depends on the turning degree of the vehicle. It can be carried out. Therefore, there is an effect that it is possible to more accurately determine whether the steer characteristic is likely to be understeer.

  According to the vehicle control device of the fourth aspect, in addition to the effect exhibited by the vehicle control device according to any one of the first to third aspects, the turning state of the vehicle is changed from the increase period to the maintenance period by the maintenance period transition determining means. When it is determined that the vehicle has shifted to, the vehicle is provided with a maintenance period vehicle speed determination unit that determines whether the vehicle speed exceeds a predetermined threshold corresponding to the turning degree of the vehicle, and the deceleration determination unit includes the maintenance period vehicle speed determination unit When the vehicle speed of the vehicle is determined not to exceed a predetermined threshold value, it is determined that the vehicle has decelerated, so that it is possible to more accurately determine whether the steering characteristic may be understeer. There is.

  According to the vehicle control device of the fifth aspect, in addition to the effect produced by the vehicle control device according to any one of the first to third aspects, the deceleration determination means is operated by the driver to decelerate the vehicle. When it is determined that the operating member is operated, it is determined that the vehicle has decelerated, so that it is possible to more accurately determine whether the steering characteristic may be understeer.

It is the schematic diagram which showed typically the vehicle by which the vehicle control apparatus in 1st Embodiment of this invention is mounted. It is a front view of a suspension apparatus. It is the block diagram which showed the electric constitution of the control apparatus for vehicles. (A) is the schematic diagram which showed typically the operation state of the steering when a vehicle turns left at a corner, (b) is the turning degree increase period and turning degree when a vehicle turns left at a corner. It is the schematic diagram which showed typically the image of a maintenance period and the turning degree decreasing period. It is a flowchart which shows a camber control process. It is a flowchart which shows a camber control process. It is a flowchart which shows a camber control process. It is the schematic diagram which showed typically the adjustment method of the camber angle of the turning inner wheel of a right-and-left rear wheel and the turning outer wheel in case a vehicle turns with a 1st driving pattern. It is the schematic diagram which showed typically the adjustment method of the camber angle of the turning inner wheel of a right-and-left rear wheel and a turning outer wheel when a vehicle turns with a 2nd driving | running pattern. It is the schematic diagram which showed typically the adjustment method of the camber angle of the turning inner wheel of a right-and-left rear wheel and a turning outer wheel when a vehicle turns with a 3rd driving | running pattern. FIG. 10 is a schematic diagram schematically showing a method for adjusting camber angles of left and right rear turning inner wheels and turning outer wheels when a vehicle turns in a fourth driving pattern. It is the block diagram which showed the electrical structure of the vehicle control apparatus in 2nd Embodiment. It is a flowchart which shows the camber control process in 2nd Embodiment. It is a flowchart which shows the camber control process in 2nd Embodiment. It is a flowchart which shows the camber control process in 2nd Embodiment. It is a flowchart which shows the camber control process in 2nd Embodiment. FIG. 10 is a schematic diagram schematically showing a method for adjusting camber angles of left and right rear turning inner wheels and turning outer wheels when a vehicle turns in a fifth driving pattern. It is the schematic diagram which showed the vehicle typically.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram schematically showing a vehicle 1 on which a vehicle control device 100 according to the first embodiment of the present invention is mounted. Note that arrows UD, LR, and FB in FIG. 1 indicate the up-down direction, the left-right direction, and the front-rear direction of the vehicle 1, respectively.

  First, a schematic configuration of the vehicle 1 will be described. As shown in FIG. 1, the vehicle 1 includes a vehicle body frame BF, a plurality of (four wheels in the present embodiment) wheels 2 that support the vehicle body frame BF, and some of the plurality of wheels 2 (the book In the embodiment, a wheel driving device 3 that rotationally drives the left and right front wheels 2FL, 2FR, a plurality of suspension devices 4 that suspend each wheel 2 on the vehicle body frame BF, and a part of the wheels 2 The embodiment mainly includes a steering device 5 that steers the left and right front wheels 2FL, 2FR).

  Next, the detailed configuration of each part will be described. As shown in FIG. 1, the wheel 2 includes left and right front wheels 2FL and 2FR located on the front side (arrow F direction side) of the vehicle 1 and left and right rear wheels located on the rear side (arrow B direction side) of the vehicle 1. Wheels 2RL and 2RR are provided. In the present embodiment, the left and right front wheels 2FL and 2FR are configured as drive wheels that are rotationally driven by the wheel drive device 3, while the left and right rear wheels 2RL and 2RR are driven as the vehicle 1 travels. It is configured as a driven wheel.

  In the wheel 2, the left and right front wheels 2FL, 2FR and the left and right rear wheels 2RL, 2RR are all configured to have the same shape and characteristics, and the tread widths of the left and right front wheels 2FL, 2FR and the left and right rear wheels 2RL, 2RR ( The dimensions in the horizontal direction in FIG. 1 are all configured to be the same width.

  As described above, the wheel drive device 3 is a device for rotationally driving the left and right front wheels 2FL and 2FR, and is configured by an electric motor 3a as described later (see FIG. 3). Further, as shown in FIG. 1, the electric motor 3 a is connected to the left and right front wheels 2 FL and 2 FR via a differential gear (not shown) and a pair of drive shafts 31.

  When the driver operates the accelerator pedal 61, a rotational driving force is applied to the left and right front wheels 2FL, 2FR from the wheel drive device 3, and the left and right front wheels 2FL, 2FR rotate according to the operation amount of the accelerator pedal 61. Driven. The difference in rotation between the left and right front wheels 2FL and 2FR is absorbed by the differential gear.

  The suspension device 4 functions as a so-called suspension for mitigating vibration transmitted from the road surface via the wheels 2 to the vehicle body frame BF. The suspension device 4 can be expanded and contracted, and as shown in FIG. Suspension devices 4FL, 4FR provided corresponding to 2FL, 2FR and suspension devices 4RL, 4RR provided corresponding to the left and right rear wheels 2RL, 2RR are provided. The suspension devices 4RL and 4RR provided corresponding to the left and right rear wheels 2RL and 2RR also have a function as a camber angle adjusting mechanism that adjusts the camber angles of the left and right rear wheels 2RL and 2RR.

  Here, with reference to FIG. 2, the detailed structure of suspension apparatus 4RL and 4RR is demonstrated. FIG. 2 is a front view of the suspension device 4RR. Here, only the configuration that functions as a camber angle adjusting mechanism will be described, and the configuration that functions as a suspension is the same as a known configuration, and thus description thereof is omitted. Further, since the configurations of the suspension devices 4RL and 4RR are common to each other, the suspension device 4RR is illustrated in FIG. 2 as a representative example.

  As shown in FIG. 2, the suspension device 4RR includes a knuckle 43 supported by the vehicle body frame BF via a shock absorber 41 and a lower arm 42, an RR motor 44RR that generates a driving force, and a driving force of the RR motor 44RR. The worm wheel 45 and the arm 46 which transmit are comprised mainly, and the movable plate 47 rock | fluctuated with respect to the knuckle 43 with the drive force of RR motor 44RR transmitted from these worm wheel 45 and the arm 46 is comprised. Yes.

  The knuckle 43 supports the wheel 2 so as to be steerable. As shown in FIG. 2, the upper end (upper side in FIG. 2) is connected to the shock absorber 41, and the lower end (lower side in FIG. 2) supports the ball joint. It is connected to the lower arm 42 through the via.

  The RR motor 44RR applies a driving force for swing driving to the movable plate 47, is constituted by a DC motor, and has a worm (not shown) formed on its output shaft 44a.

  The worm wheel 45 transmits the driving force of the RR motor 44RR to the arm 46, meshes with a worm formed on the output shaft 44a of the RR motor 44RR, and constitutes a staggered shaft gear pair together with the worm.

  The arm 46 transmits the driving force of the RR motor 44RR transmitted from the worm wheel 45 to the movable plate 47, and has one end (right side in FIG. 2) via the first connecting shaft 48 as shown in FIG. The other end (left side in FIG. 2) is connected to the upper end (upper side in FIG. 2) via the second connection shaft 49 while being connected to a position eccentric from the rotation shaft 45 a of the worm wheel 45.

  The movable plate 47 supports the wheel 2 in a rotatable manner. As described above, the upper end (upper side in FIG. 2) is coupled to the arm 46, and the lower end (lower side in FIG. 2) is interposed via the camber shaft 50. The knuckle 43 is pivotally supported so as to be swingable.

  According to the suspension device 4RR configured as described above, when the RR motor 44RR is driven, the worm wheel 45 rotates and the rotational motion of the worm wheel 45 is converted into linear motion of the arm 46. As a result, when the arm 46 moves linearly, the movable plate 47 is driven to swing with the camber shaft 50 as the swing shaft, and the camber angle of the wheel 2 is adjusted.

  In the present embodiment, the first connecting shaft 48, the rotating shaft 45a, the rotating shaft 45a of each connecting shaft 48, 49 and the worm wheel 45 in the direction from the vehicle body frame BF toward the wheel 2 (arrow R direction). A negative camber state positioned on a straight line in the order of the second connecting shaft 49, a positive camber state positioned on a straight line in the order of the rotating shaft 45a, the first connecting shaft 48, and the second connecting shaft 49, and The camber angle of the wheel 2 is adjusted so that one of the neutral camber states (state shown in FIG. 2) between the first camber state and the second camber state is reached.

  Further, in the present embodiment, in the negative camber state, the camber angle of the wheel 2 is a predetermined angle (the present embodiment is a state in which the center line of the wheel 2 is inclined inward of the vehicle 1 with respect to the vertical line). -3 °, hereinafter referred to as “first camber angle”), and a negative camber is applied to the wheel 2. On the other hand, in the positive camber state, the camber angle of the wheel 2 is adjusted to a predetermined angle (3 ° in the present embodiment) in the plus direction (the center line of the wheel 2 is inclined to the outside of the vehicle 1 with respect to the vertical line). Then, a positive camber is given to the wheel 2. On the other hand, in the neutral camber state (the state shown in FIG. 2), the camber angle of the wheel 2 is adjusted to 0 ° (hereinafter referred to as “second camber angle”).

  The suspension devices 4FL and 4FR provided corresponding to the left and right front wheels 2FL and 2FR are omitted in the function of adjusting the camber angle of the left and right front wheels 2FL and 2FR (that is, the suspension device 4RR shown in FIG. 2). The other configurations are the same as those of the suspension devices 4RL and 4RR, except that the RR motor 44RR is omitted in FIG.

  Returning to FIG. The steering device 5 is a device for steering an operation of the steering 63 by the driver to the left and right front wheels 2FL, 2FR, and is configured as a so-called rack and pinion type steering gear.

  According to the steering device 5, the operation (rotation) of the steering 63 by the driver is first transmitted to the universal joint 52 via the steering column 51, and the pinion 53 a of the steering box 53 is changed while the angle is changed by the universal joint 52. Is transmitted as rotational motion. Then, the rotational motion transmitted to the pinion 53a is converted into a linear motion of the rack 53b, and the tie rod 54 connected to both ends of the rack 53b moves by the linear motion of the rack 53b. As a result, the tie rod 54 pushes and pulls the knuckle 55, so that a predetermined steering angle is given to the wheel 2.

  The accelerator pedal 61 and the brake pedal 62 are operation members operated by the driver, and the traveling speed and braking force of the vehicle 1 are determined according to the operation state (depression amount, depressing speed, etc.) of the pedals 61 and 62. The wheel drive device 3 is driven and controlled. The steering 63 is an operation member operated by the driver, and the left and right front wheels 2FL and 2FR are steered by the steering device 5 according to the operation state (rotation amount, rotation speed, etc.).

  The vehicle control device 100 is a device for controlling each part of the vehicle 1 configured as described above. For example, the camber angle adjusting device 44 (see FIG. 3).

  Next, a detailed configuration of the vehicle control device 100 will be described with reference to FIG. FIG. 3 is a block diagram showing an electrical configuration of the vehicle control device 100. As shown in FIG. 3, the vehicle control device 100 includes a CPU 71, a ROM 72, and a RAM 73, which are connected to an input / output port 75 via a bus line 74. The input / output port 75 is connected to a device such as the wheel drive device 3.

  The CPU 71 is an arithmetic unit that controls each unit connected by the bus line 74. The ROM 72 is a non-rewritable non-volatile memory that stores a control program executed by the CPU 71 (for example, a program in the flowcharts shown in FIGS. 5 to 7), fixed value data, and the like, as shown in FIG. A first US limit value map 72a and a second US limit value map 72b, a turning state threshold value memory 72c, a first camber adjustment threshold value map 72d, and a second camber adjustment threshold value map 72e are provided.

  The first US limit value map 72a is a vehicle speed (running speed of the vehicle 1) that becomes understeer than the default steering characteristic that is preset in the structure of the vehicle 1 when the vehicle 1 turns around a corner (curve, intersection, etc.). ) Threshold value (hereinafter referred to as “US limit value”). In this first US limit value map 72a, the relationship between the corner radius and the US limit value is stored. As the corner radius decreases, the US limit value decreases, and conversely, the corner radius decreases. The larger the value is, the higher the US limit value is set.

  Similar to the first US limit value map 72a, the second US limit value map 72b is a map that stores US limit values that become understeer than the default steer characteristic when the vehicle 1 turns a corner. In this second US limit value map 72b, the relationship between the lateral G of the vehicle 1 and the US limit value is stored. As the lateral G becomes smaller, the US limit value becomes higher. The larger the value is, the lower the US limit value is set.

  The turning state threshold memory 72c is an operation speed of the steering wheel 63 that serves as a determination reference for determining whether the turning state of the vehicle 1 is in a turning degree increasing period, a turning degree maintaining period, or a turning degree decreasing period, which will be described later. A predetermined value Vs, Vm, Ve described later is stored.

  The first camber adjustment threshold map 72d determines how to adjust the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL, 2RR when the vehicle speed in the turning degree decreasing period is lower than the US limit value. This is a map that stores a vehicle speed threshold value that is a criterion for the determination, and that is a threshold value (hereinafter referred to as a “first threshold value”) that is lower than the US limit value stored in the second US limit value map 72b. The first camber adjustment threshold value map 72d stores the relationship between the lateral G of the vehicle 1 and the first threshold value. The smaller the lateral G is, the higher the first threshold value is. The first threshold value is set to be lower as the value becomes larger.

  The second camber adjustment threshold map 72e determines how to adjust the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR when the vehicle speed in the turning degree decreasing period is lower than the US limit value. This is a map that stores a vehicle speed threshold value that serves as a determination criterion for this purpose and that is lower than the first threshold value that is stored in the first camber adjustment threshold value map 72d (hereinafter referred to as “second threshold value”). In this second camber adjustment threshold map 72d, the relationship between the lateral G of the vehicle 1 and the second threshold is stored. As the lateral G becomes smaller, the second threshold becomes higher. The second threshold is set to be lower as the value of becomes larger.

  The RAM 73 is a memory for storing various data in a rewritable manner when the control program is executed, and is provided with a turning degree increasing period US flag 73a and a turning degree maintaining period US flag 73b as shown in FIG. .

  The turning degree increasing period US flag 73a is a flag indicating whether or not the vehicle speed in the turning degree increasing period is equal to or higher than the US limit value. When the turning degree increasing period US flag 73a is on, the CPU 71 determines that the vehicle speed in the turning degree increasing period is equal to or higher than the US limit value, and when it is off, the vehicle speed in the turning degree increase period is greater than the US limit value. Judge that it was low.

  The turning degree maintenance period US flag 73b is a flag indicating whether or not the vehicle speed in the turning degree maintenance period is equal to or higher than the US limit value. When the turning degree maintenance period US flag 73b is on, the CPU 71 determines that the vehicle speed in the turning degree maintenance period is equal to or higher than the US limit value. Judge that it was low.

  As described above, the wheel drive device 3 is a device for rotationally driving the left and right front wheels 2FL, 2FR (see FIG. 1), and an electric motor 3a that applies a rotational driving force to the left and right front wheels 2FL, 2FR. A drive control circuit (not shown) for driving and controlling the electric motor 3a based on an instruction from the CPU 71 is mainly provided. However, the wheel drive device 3 is not limited to the electric motor 3a, and other drive sources can naturally be adopted. Examples of other drive sources include a hydraulic motor and an engine.

  The camber angle adjusting device 44 is a device for adjusting the camber angles of the left and right rear wheels 2RL, 2RR. As described above, the camber angle adjusting device 44 swings the movable plate 47 (see FIG. 2) of the suspension devices 4RL, 4RR. RL and RR motors 44RL and 44RR that respectively apply the above driving force, and a drive control circuit (not shown) that drives and controls the motors 44RL and 44RR based on instructions from the CPU 71.

  The acceleration sensor device 80 is a device for detecting the acceleration of the vehicle 1 and outputting the detection result to the CPU 71. The acceleration sensor device 80a includes a longitudinal acceleration sensor 80a, a lateral acceleration sensor 80b, and the acceleration sensors 80a and 80b. It mainly includes an output circuit (not shown) that processes the detection result and outputs it to the CPU 71.

  The front-rear acceleration sensor 80a is a sensor that detects the acceleration in the front-rear direction (arrow FB direction in FIG. 1) of the vehicle 1 (body frame BF), that is, the so-called front-rear G. The left-right acceleration sensor 80b This is a sensor that detects the acceleration in the left-right direction (the direction of the arrow LR in FIG. 1) of the frame BF, so-called lateral G. In the present embodiment, each of the acceleration sensors 80a and 80b is configured as a piezoelectric sensor using a piezoelectric element.

  The CPU 71 integrates the detection results (front-rear G and lateral G) of the longitudinal acceleration sensor 80a and the lateral acceleration sensor 80b input from the acceleration sensor device 80 with respect to time to obtain speeds in two directions (front-rear direction and left-right direction). While calculating each, the vehicle speed (running speed of the vehicle 1) is calculated by combining these two direction components.

  The gyro sensor device 81 is a device for detecting the rotation angle of the vehicle 1 around the reference axis passing through the center of gravity of the vehicle 1 and outputting the detection result to the CPU 71. Rotation of the vehicle 1 (body frame BF) around a vertical axis (arrow UD direction axis in FIG. 1), a left-right direction axis (arrow LR direction axis in FIG. 1), and a vertical axis (arrow UD direction axis in FIG. 1). It mainly includes a gyro sensor 81a that detects each angle, so-called roll angle, pitch angle, and yaw angle, and an output circuit (not shown) that processes the detection result of the gyro sensor 81a and outputs the result to the CPU 71.

  Further, the gyro sensor device 81 time-differentiates the detection results (roll angle, pitch angle, yaw angle) of the gyro sensor 81a, and the rotational angular velocity of the vehicle 1 (body frame BF) around the reference axis passing through the center of gravity of the vehicle 1 An arithmetic circuit (not shown) for calculating a so-called roll rate, pitch rate, and yaw rate is provided, and a calculation result by the arithmetic circuit is processed by an output circuit and output to the CPU 71.

  In the present embodiment, the gyro sensor 81a is constituted by an optical gyro sensor that detects the rotation angular velocity and the rotation angle by the Sagnac effect. However, it is naturally possible to employ other types of gyro sensors. Examples of other types of gyro sensors include mechanical and fluid gyro sensors.

  The navigation device 82 is a device for acquiring the current position of the vehicle 1 and road information of the traveling path of the travel destination, and receives a radio wave from a GPS satellite to acquire the current position of the vehicle 1 (see FIG. A map data acquisition unit (not shown) for acquiring map data in which road information is stored, the map data acquired by the map data acquisition unit, and the current position of the vehicle 1 acquired by the current position acquisition unit Obtained by a road information acquisition unit (not shown) that acquires road information of a travel route on which the vehicle 1 travels, and a current position and road information acquisition unit of the vehicle 1 acquired by the current position acquisition unit It mainly includes an output circuit (not shown) that processes the road information of the travel path of the travel destination and outputs it to the CPU 71.

  The map data acquired by the map data acquisition unit stores at least the position of the corner (curve, intersection, etc.) and the radius of the corner as road information, and the CPU 71 proceeds to the destination input from the navigation device 82. Based on the road information of the traveling road, the position and radius of the corner at the destination (information relating to the turning degree of the vehicle 1) are grasped in advance.

  The accelerator pedal sensor device 61a is a device for detecting the operation amount of the accelerator pedal 61 and outputting the detection result to the CPU 71. An angle sensor (not shown) for detecting the depression amount of the accelerator pedal 61; It mainly includes an output circuit (not shown) that processes the detection result of the angle sensor and outputs it to the CPU 71.

  The brake pedal sensor device 62a is a device for detecting the operation amount of the brake pedal 62 and outputting the detection result to the CPU 71. An angle sensor (not shown) for detecting the depression amount of the brake pedal 62; It mainly includes an output circuit (not shown) that processes the detection result of the angle sensor and outputs it to the CPU 71.

  The steering sensor device 63a is a device for detecting the operation amount of the steering 63 and outputting the detection result to the CPU 71. An angle sensor (not shown) for detecting the rotation amount of the steering 63, and the angle sensor. And an output circuit (not shown) for processing the detection result and outputting it to the CPU 71.

  In the present embodiment, each angle sensor is configured as a contact-type potentiometer using electric resistance. The CPU 71 time-differentiates the detection results (operation amounts) of the angle sensors input from the sensor devices 61a, 62a, and 63a to calculate the operation speeds of the pedals 61 and 62 and the steering 63.

  As another input / output device 90 shown in FIG. 3, for example, a sensor that detects the operation of a turn signal lamp (direction indicator lamp), a radio wave transmitted by a vehicle sensor installed at an intersection, and the position of the intersection The sensor etc. which grasp | ascertain are illustrated.

  Next, referring to FIG. 4, the operation state of steering 63 when vehicle 1 turns a corner (here, when turning left) and the turning of vehicle 1 defined based on the operation state of steering 63. The state will be described. FIG. 4A is a schematic diagram schematically showing an operation state of the steering 63 when the vehicle 1 turns left at the corner, and FIG. 4B shows a case where the vehicle 1 turns left at the corner. It is the schematic diagram which showed typically the image of the turning degree increase period, the turning degree maintenance period, and the turning degree decrease period. In FIG. 4A, the operation amount and operation speed of the steering wheel 63 are indicated by a solid line and a one-dot chain line, respectively, and the operation direction of the steering wheel 63 is leftward with respect to the neutral state (the operation amount is 0). The case of + is indicated by +, and the case of rightward is indicated by-. Moreover, the arrow of FIG.4 (b) has shown the advancing direction of the vehicle 1. FIG.

  When the vehicle 1 that has traveled straight turns left in a corner, the driver first enters the corner by operating the steering 63 leftward from the neutral state. As a result, as shown in FIG. 4A, the operation speed of the steering wheel 63 increases from 0 to the + direction, and the operation amount of the steering wheel 63 also increases from 0 to the + direction at a rate smaller than the increase rate.

  After entering the corner, the driver stops the steering wheel 63 operated in the left direction at a predetermined position and turns the corner while keeping the operation amount of the steering wheel 63 constant. As a result, the operation speed of the steering 63 changes from increasing to decreasing to 0, and the operating amount of the steering 63 is maintained at a predetermined operating amount.

  Thereafter, the driver operates the steering 63 to the right at the corner exit to bring it to the neutral state. As a result, the operation speed of the steering 63 decreases from 0 to the negative direction, and the operation amount of the steering 63 also decreases at a rate smaller than the decrease rate. Then, the operation speed of the steering 63 starts from decreasing to increasing and becomes 0, and the operation amount of the steering 63 also becomes 0.

  As shown in FIG. 4A, in the present embodiment, when the operation speed of the steering 63 increases from 0 to the + direction and exceeds a positive predetermined value Vs, the vehicle 1 changes from the straight traveling state to the turning state. Judge that the state has changed. Then, after the operating speed of the steering 63 increases in the positive direction from 0 and exceeds the positive predetermined value Vs, the vehicle until the operating speed changes from increasing to decreasing and becomes smaller than the positive predetermined value Vm. The turning state of 1 is the turning degree increasing period, and after the operating speed of the steering 63 becomes smaller than the positive predetermined value Vm, the operating speed decreases from 0 to the negative direction and becomes smaller than the negative predetermined value Ve. The turning state of the vehicle 1 until this time is defined as a turning degree maintenance period. Further, the turning state of the vehicle 1 from when the operation speed of the steering 63 becomes smaller than the negative predetermined value Ve to when the operation speed changes from decreasing to increasing and becomes 0 is defined as a turning degree decreasing period. These turning degree increase period, turning degree maintenance period, and turning degree decrease period have an image as shown in FIG.

  Note that the operation state of the steering 63 when the vehicle 1 turns to the right at the corner is obtained by switching the signs of + and − in FIG. Therefore, the predetermined values Vs, Vm, and Ve that define the turning degree increasing period, turning degree maintaining period, and turning degree decreasing period are absolute values. However, the predetermined values Vs, Vm, and Ve may be different from each other, or may all be the same value.

  Next, camber control processing will be described with reference to FIGS. 5 to 7 are flowcharts showing the camber control process. This process is a process that is repeatedly executed by the CPU 71 (for example, at intervals of 0.2 seconds) while the power of the vehicle control device 100 is turned on, and adjusts the camber angles of the left and right rear wheels 2RL and 2RR. Thus, the turning performance of the vehicle 1 is improved and the turning stability is ensured.

  Regarding the camber control process, the CPU 71 first acquires the current position of the vehicle 1 (S1), acquires road information of the travel path of the destination (for example, 50 meters ahead) (S2), and sets a corner (curve) at the destination. It is determined whether or not an intersection exists (S3). As a result, when it is determined that there is no corner at the destination (S3: No), this camber control process is terminated.

  On the other hand, if it is determined that there is a corner at the destination (S3: Yes), the radius of the corner is acquired (S4), and the US limit value corresponding to the acquired corner radius is set to the first US limit value map 72a. (S5). In addition, the process of S1, S2, and S4 is performed using the navigation apparatus 82 as mentioned above.

  Next, the operation speed of the steering 63 is calculated based on the detection result (operation amount of the steering 63) of the steering sensor device 63a (S6), and it is determined whether or not the calculated operation speed exceeds a predetermined value Vs (S7). ). As a result, when it is determined that the operation speed of the steering 63 does not exceed the predetermined value Vs (S7: No), the processes of S6 and S7 are performed until it is determined that the operation speed of the steering 63 exceeds the predetermined value Vs. Repeatedly.

  On the other hand, if it is determined that the operation speed of the steering 63 has exceeded the predetermined value Vs (S7: Yes), that is, if it is determined that the vehicle 1 has changed from the straight traveling state to the turning state, then the acceleration sensor A vehicle speed is calculated based on the detection results (front and rear G, lateral G) of the device 80 (S8), and it is determined whether or not the calculated vehicle speed is equal to or higher than the US limit value acquired in the process of S5 (S9). As a result, when it is determined that the vehicle speed is lower than the US limit value (S9: No), the turning degree increasing period US flag 73a is turned off (S10), and the turning inner wheels and turning of the left and right rear wheels 2RL and 2RR are turned off. The camber angle of the outer ring is adjusted to the second camber angle (S11). That is, the camber angle of the inner turning wheel and the camber angle of the outer turning wheel are made equal. Thereby, the canvas last generated in the turning inner wheels of the left and right rear wheels 2RL and 2RR and the canvas last generated in the turning outer wheel can be made equal to prevent the yaw moment from acting on the vehicle 1. Therefore, the turning stability of the vehicle 1 can be ensured.

  On the other hand, when it is determined as a result of the process of S9 that the vehicle speed is equal to or higher than the US limit value (S9: Yes), that is, when it is determined that the steering characteristic may be understeer, the turning degree increasing period The US flag 73a is turned on (S12), the camber angles of the turning inner wheels of the left and right rear wheels 2RL, 2RR are adjusted to the first camber angle, and the camber angle of the turning outer wheel is adjusted to the second camber angle (S13). That is, the camber angle of the inner turning wheel is made larger in the negative camber direction than the camber angle of the outer turning wheel. Thus, the canvas last generated in the turning inner wheels of the left and right rear wheels 2RL and 2RR is made larger than the canvas last generated in the turning outer wheel, and the yaw moment for causing the steering characteristic to oversteer is applied to the vehicle 1. Can do. Therefore, understeer can be suppressed. At the same time, it is possible to improve the turnability of the turning degree increasing period.

  After executing the processing of S11 or S13, the operation speed of the steering 63 is again calculated based on the detection result (operation amount of the steering 63) of the steering sensor device 63a (S14), and the calculated operation speed is a predetermined value. It is determined whether or not it is smaller than Vm (S15). As a result, when it is determined that the operation speed of the steering 63 is not lower than the predetermined value Vm (S15: No), S14 is performed until it is determined that the operation speed of the steering 63 is lower than the predetermined value Vm. And the process of S15 is repeatedly performed.

  On the other hand, when it is determined that the operation speed of the steering 63 has become smaller than the predetermined value Vm (S15: Yes), that is, it is determined that the turning state of the vehicle 1 has transitioned from the turning degree increasing period to the turning degree maintaining period. In that case, the lateral G of the vehicle 1 is then detected using the acceleration sensor device 80 (S16), and the US limit value corresponding to the detected lateral G is acquired from the second US limit value map 72b (S17). Then, the vehicle speed is calculated based on the detection results (front and rear G, lateral G) of the acceleration sensor device 80 (S18), and it is determined whether or not the calculated vehicle speed is equal to or higher than the US limit value acquired in the process of S17 ( S19). As a result, when it is determined that the vehicle speed is greater than or equal to the US limit value (S19: Yes), that is, when it is determined that the steering characteristic may become understeer, the turning degree maintenance period US flag 73b is turned on. At the same time (S20), it is determined whether or not the turning degree increasing period US flag 73a is on (S21), and when it is determined that the turning degree increasing period US flag 73a is off (S21: No). The camber angles of the turning inner wheels of the left and right rear wheels 2RL, 2RR are adjusted to the first camber angle (S22). That is, when it is determined that the turning degree increasing period US flag 73a is off (S21: No), the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both the second camber angle. Since the adjustment is made, the camber angle of the inner turning wheel is adjusted to the first camber angle, and the camber angle of the inner turning wheel is made larger in the negative camber direction than the camber angle of the outer turning wheel. Thus, the canvas last generated in the turning inner wheels of the left and right rear wheels 2RL and 2RR is made larger than the canvas last generated in the turning outer wheel, and the yaw moment for causing the steering characteristic to oversteer is applied to the vehicle 1. Can do. Therefore, understeer can be suppressed.

  On the other hand, if it is determined as a result of the processing of S21 that the turning degree increasing period US flag 73a is on (S21: Yes), the camber angles of the turning inner wheels of the left and right rear wheels 2RL, 2RR have already been set to the first. Since the camber angle is adjusted and the camber angle of the turning outer wheel is adjusted to the second camber angle, the process of S22 is skipped and the process proceeds to S26. That is, the camber angles of the turning inner and turning outer wheels of the left and right rear wheels 2RL and 2RR are maintained. Thereby, an understeer can be suppressed following the turning degree increase period.

  On the other hand, if it is determined that the vehicle speed is lower than the US limit value as a result of the process in S19 (S19: No), the turning degree maintenance period US flag 73b is turned off (S23), and the turning degree increase period US It is determined whether or not the flag 73a is on (S24), and when it is determined that the turning degree increasing period US flag 73a is on (S24: Yes), the left and right rear wheels 2RL and 2RR are turned inner wheels. The camber angle is adjusted to the second camber angle (S25). That is, when it is determined that the turning degree increasing period US flag 73a is on (S24: Yes), the camber angles of the turning inner wheels of the left and right rear wheels 2RL and 2RR are adjusted to the first camber angle. Since the turning outer wheel is adjusted to the second camber angle, the camber angle of the turning inner wheel is adjusted to the second camber angle to reduce the absolute value thereof. Thereby, the yaw moment applied to the vehicle 1 during the turning degree increase period can be reduced. Therefore, it is possible to avoid oversteering by avoiding the tendency of the steer characteristic to continue to be oversteered after the turning degree increase period even though the vehicle speed is lower than the US limit value. Further, by making the camber angle of the turning inner wheel equal to the camber angle of the turning outer wheel, the canvas last generated in the turning inner wheel of the left and right rear wheels 2RL and 2RR and the canvas last generated in the turning outer wheel are made equal to each other. 1 can prevent the yaw moment from acting. Therefore, the turning stability of the vehicle 1 can be ensured.

  On the other hand, if it is determined as a result of the processing of S24 that the turning degree increasing period US flag 73a is off (S24: No), the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR have already been obtained. Are adjusted to the second camber angle, the process of S25 is skipped and the process proceeds to S26. That is, the camber angles of the turning inner and turning outer wheels of the left and right rear wheels 2RL and 2RR are maintained. Thereby, the turning stability of the vehicle 1 can be ensured following the turning degree increasing period.

  After executing the processing of S22 or S25, the operation speed of the steering 63 is again calculated based on the detection result (operation amount of the steering 63) of the steering sensor device 63a (S26), and the calculated operation speed is a predetermined value. It is determined whether or not it has become smaller than Ve (S27). As a result, when it is determined that the operation speed of the steering 63 is not lower than the predetermined value Ve (S27: No), S26 is performed until it is determined that the operation speed of the steering 63 is lower than the predetermined value Ve. And the process of S27 is repeatedly executed.

  On the other hand, when it is determined that the operation speed of the steering 63 has become smaller than the predetermined value Ve (S27: Yes), that is, it is determined that the turning state of the vehicle 1 has transitioned from the turning degree maintaining period to the turning degree decreasing period. In that case, the lateral G of the vehicle 1 is then detected using the acceleration sensor device 80 (S28), and the US limit value corresponding to the detected lateral G is acquired from the second US limit value map 72b (S29). Then, the vehicle speed is calculated based on the detection result (front and rear G, lateral G) of the acceleration sensor device 80 (S30), and it is determined whether or not the calculated vehicle speed is equal to or higher than the US limit value acquired in the process of S29 ( S31). As a result, when it is determined that the vehicle speed is greater than or equal to the US limit value (S31: Yes), that is, when it is determined that the steering characteristic may become understeer, the turning degree maintenance period US flag 73b is turned on. (S32), if it is determined that the turning degree maintenance period US flag 73b is off (S32: No), the camber angles of the turning inner wheels of the left and right rear wheels 2RL, 2RR are set. The first camber angle is adjusted (S33), and this camber control process is terminated. That is, when it is determined that the turning degree maintenance period US flag 73b is off (S32: No), the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both the second camber angle. Since the adjustment is made, the camber angle of the inner turning wheel is adjusted to the first camber angle, and the camber angle of the inner turning wheel is made larger in the negative camber direction than the camber angle of the outer turning wheel. Thus, the canvas last generated in the turning inner wheels of the left and right rear wheels 2RL and 2RR is made larger than the canvas last generated in the turning outer wheel, and the yaw moment for causing the steering characteristic to oversteer is applied to the vehicle 1. Can do. Therefore, understeer can be suppressed.

  On the other hand, if it is determined as a result of the processing of S32 that the turning degree maintenance period US flag 73b is on (S32: Yes), the camber angles of the turning inner wheels of the left and right rear wheels 2RL and 2RR are already the first. Since the camber angle is adjusted and the camber angle of the turning outer wheel is adjusted to the second camber angle, the process of S33 is skipped and the camber control process is terminated. That is, the camber angles of the turning inner and turning outer wheels of the left and right rear wheels 2RL and 2RR are maintained. Thereby, an understeer can be suppressed following a turning degree maintenance period.

  On the other hand, if it is determined as a result of the processing of S31 that the vehicle speed is lower than the US limit value (S31: No), it is determined whether or not the turning degree maintenance period US flag 73b is on (S34). When it is determined that the turning degree maintenance period US flag 73b is ON (S34: Yes), the first threshold corresponding to the lateral G of the vehicle 1 detected in the process of S28 is set to the first camber adjustment threshold map 72d. (S35), it is determined whether the vehicle speed calculated in the process of S30 is equal to or higher than the first threshold (S36). As a result, when it is determined that the vehicle speed is equal to or higher than the first threshold (S36: Yes), the camber angles of the turning inner wheels of the left and right rear wheels 2RL, 2RR are adjusted to the second camber angle (S37), This camber control process is terminated. That is, when it is determined that the turning degree maintenance period US flag 73b is on (S34: Yes), the camber angles of the turning inner wheels of the left and right rear wheels 2RL and 2RR are adjusted to the first camber angle. Since the turning outer wheel is adjusted to the second camber angle, the camber angle of the turning inner wheel is adjusted to the second camber angle to reduce the absolute value thereof. As a result, the yaw moment applied to the vehicle 1 during the turning degree maintaining period can be reduced. Therefore, it is possible to avoid oversteering by avoiding the tendency of the steer characteristic to continue to be oversteering after the turning degree maintenance period even though the vehicle speed becomes lower than the US limit value. Further, by making the camber angle of the turning inner wheel equal to the camber angle of the turning outer wheel, the canvas last generated in the turning inner wheel of the left and right rear wheels 2RL and 2RR and the canvas last generated in the turning outer wheel are made equal to each other. 1 can prevent the yaw moment from acting. Therefore, the turning stability of the vehicle 1 can be ensured.

  On the other hand, when it is determined that the vehicle speed is lower than the first threshold value as a result of the process of S36 (S36: No), the second threshold value corresponding to the lateral G of the vehicle 1 detected in the process of S28 is adjusted to the second camber. While acquiring from the threshold map 72e (S38), it is judged whether the vehicle speed calculated by the process of S30 is more than a 2nd threshold value (S39). As a result, when it is determined that the vehicle speed is equal to or higher than the second threshold (S39: Yes), the camber angles of the turning outer wheels of the left and right rear wheels 2RL and 2RR are adjusted to the first camber angle (S40), This camber control process is terminated. That is, when it is determined that the turning degree maintenance period US flag 73b is on (S34: Yes), the camber angles of the turning inner wheels of the left and right rear wheels 2RL and 2RR are adjusted to the first camber angle. Since the turning outer wheel is adjusted to the second camber angle, the camber angle of the turning outer wheel is adjusted to the first camber angle to increase the absolute value thereof. As a result, the yaw moment applied to the vehicle 1 during the turning degree maintaining period can be reduced. Therefore, it is possible to avoid oversteering by avoiding the tendency of the steer characteristic to continue to be oversteering after the turning degree maintenance period even though the vehicle speed becomes lower than the US limit value. Further, by adjusting the camber angles of the turning inner wheel and the turning outer wheel to the first camber angle, the canvas last generated on the turning inner wheel of the left and right rear wheels 2RL and 2RR and the canvas last generated on the turning outer wheel are utilized. Thus, the grip performance of the left and right rear wheels 2RL, 2RR can be improved. As a result, the steer characteristic can be lightly understeered. Therefore, when the vehicle speed is relatively low during the turning degree decreasing period and the influence of the steering characteristic oversteering tends to remain in the turning degree maintaining period, the influence is converged to ensure the turning stability of the vehicle 1. Can do.

  On the other hand, if it is determined that the vehicle speed is lower than the second threshold value as a result of the process of S39 (S39: No), the camber angles of the turning inner wheels of the left and right rear wheels 2RL, 2RR are adjusted to the second camber angle. The camber angle of the turning outer wheel is adjusted to the first camber angle (S41), and this camber control process is terminated. That is, the camber angle of the turning outer wheel is made larger in the negative direction than the camber angle of the turning inner wheel. As a result, the canvas last generated on the turning outer wheels of the left and right rear wheels 2RL and 2RR is made larger than the canvas last generated on the turning inner wheel, and the yaw moment for making the steering characteristic understeer tends to act on the vehicle 1. Can do. Therefore, when the vehicle speed in the turning degree decreasing period is extremely low and the influence of the steer characteristic on the oversteering tendency tends to remain in the turning degree maintaining period, it is possible to cancel the influence and prevent oversteering.

  On the other hand, if it is determined as a result of the processing of S34 that the turning degree maintenance period US flag 73b is off (S34: No), the steering characteristic is not oversteered during the turning degree maintenance period, so S35 The subsequent processing is skipped and the camber control processing is terminated. That is, when it is determined that the turning degree maintenance period US flag 73b is off (S34: No), the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are already the second camber. Since the angle is adjusted, the camber angle state is maintained. Thereby, the turning stability of the vehicle 1 can be ensured following the turning degree maintenance period.

  As described above, according to the present embodiment, the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR are determined in the vehicle speed in each of the turning degree increasing period, turning degree maintaining period, and turning degree decreasing period. By adjusting according to this, the turning stability of the vehicle 1 can be ensured and the turning performance can be improved.

  Here, referring to FIG. 8 to FIG. 11, four driving patterns that may be actually performed are taken as an example of the adjustment method of the camber angles of the left and right rear wheels 2RL and 2RR when the vehicle 1 turns. I will give you a description.

  First, the first operation pattern will be described with reference to FIG. FIG. 8 is a schematic diagram schematically showing a method for adjusting the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR when the vehicle 1 turns in the first driving pattern.

  As shown in FIG. 8, the first driving pattern is that the vehicle speed at the time of entering the corner is fast, the vehicle speed at the turning degree increasing period exceeds the US limit value, and the vehicle does not decelerate after entering the corner and maintains the turning degree. The vehicle speed in the period also exceeds the US limit value, and finally the vehicle decelerates at the exit of the corner, and the vehicle speed in the period when the turning degree decreases becomes lower than the US limit value.

  In this case, in the camber control process shown in FIGS. 5 to 7, S1 to S9 (S9: Yes) → S12 to S19 (S19: Yes) → S20, S21 (S21: Yes) → S26 to S31 (S31: No) → S34 (S34: Yes) → S35 and S36 are executed in the path. In addition, after executing the process of S36, each process is executed in the path of S36 (S36: Yes) → S37, or the path of S36 (S36: No) → S38, S39. , S39 (S39: Yes) → S40, or S39 (S39: No) → S41.

  That is, in the turning degree increase period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL, 2RR is adjusted to the first camber angle, and the camber angle of the turning outer wheel is adjusted to the second camber angle. Further, the camber angle state is maintained even in the turning degree maintenance period. As a result, even if the vehicle speed at the time of entering the corner is high and the vehicle speed during the turning degree increase period exceeds the US limit value, the yaw moment for causing the steering characteristic to oversteer is applied to the vehicle 1 to suppress understeer. be able to. At the same time, the turning ability when entering the corner can be improved. Furthermore, even after entering the corner, even if the vehicle speed in the turning degree maintenance period exceeds the US limit value, understeer can be suppressed following the turning degree increase period.

  Further, during the turning degree decreasing period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL, 2RR is adjusted to the second camber angle, and the camber angle of the turning outer wheel is maintained at the second camber angle. Alternatively, the camber angle of the inner turning wheel is maintained at the first camber angle, and the camber angle of the outer turning wheel is adjusted to the first camber angle. Alternatively, the camber angle of the inner turning wheel is adjusted to the second camber angle, and the camber angle of the outer turning wheel is adjusted to the first camber angle. As a result, it is possible to avoid oversteer by avoiding the tendency to oversteer the steering characteristic following the turning degree maintenance period even though the vehicle speed is lower than the US limit value at the corner exit. Can be prevented. In addition, when the vehicle speed is relatively low during the turning degree decreasing period and the effect of the steering characteristic oversteering tends to remain during the turning degree maintaining period, the influence is converged to ensure the turning stability of the vehicle 1. Can do. Furthermore, when the vehicle speed in the turning degree decreasing period is extremely low and the influence of the steer characteristic on the oversteer tendency tends to remain in the turning degree maintaining period, it is possible to cancel the influence and prevent oversteering. Note that, as described above, how to adjust the camber angles of the left and right rear wheels 2RL, 2RR in the turning degree decreasing period is determined according to the vehicle speed in the turning degree decreasing period.

  In the camber control processing shown in FIGS. 5 to 7, the processing other than the processing executed in the above-described route is not necessarily limited to the processing shown in FIGS. 5 to 7, and other processing is executed. You may comprise. That is, for example, when it is determined that the vehicle speed during the turning degree increase period is lower than the US limit value, the camber control processing shown in FIGS. 5 to 7 shows the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR. Are adjusted to the second camber angle, but instead, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL, 2RR may be adjusted to the first camber angle.

  Next, a second operation pattern will be described with reference to FIG. FIG. 9 is a schematic diagram schematically showing a method for adjusting the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR when the vehicle 1 turns in the second driving pattern.

  As shown in FIG. 9, the second driving pattern is that the vehicle speed when entering the corner is fast and the vehicle speed during the turning degree increase period exceeds the US limit value, but decelerates after entering the corner, and the turning degree maintaining period And, the driving pattern is such that the vehicle speed in the turning degree decreasing period becomes lower than the US limit value.

  In this case, in the camber control process shown in FIGS. 5 to 7, S1 to S9 (S9: Yes) → S12 to S19 (S19: No) → S23, S24 (S24: Yes) → S25 to S31 (S31: Each process is executed along a route of No) → S34 (S34: No).

  That is, in the turning degree increase period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL, 2RR is adjusted to the first camber angle, and the camber angle of the turning outer wheel is adjusted to the second camber angle. As a result, even if the vehicle speed at the time of entering the corner is high and the vehicle speed during the turning degree increase period exceeds the US limit value, the yaw moment for causing the steering characteristic to oversteer is applied to the vehicle 1 to suppress understeer. be able to. At the same time, the turning ability when entering the corner can be improved.

  In the turning degree maintenance period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL and 2RR is adjusted to the second camber angle, and the camber angle of the turning outer wheel is maintained at the second camber angle. Further, the camber angle state is maintained even during the turning degree decreasing period. This prevents the vehicle from oversteering by avoiding the tendency to oversteer the steer characteristic after the turning degree increase period even though the vehicle decelerates after entering the corner and the vehicle speed becomes lower than the US limit value. can do. Further, by making the camber angle of the turning inner wheel equal to the camber angle of the turning outer wheel, it is possible to prevent the yaw moment from acting on the vehicle 1 and to ensure the turning stability of the vehicle 1.

  In the camber control processing shown in FIGS. 5 to 7, the processing other than the processing executed in the above-described route is not necessarily limited to the processing shown in FIGS. 5 to 7, and other processing is executed. You may comprise. That is, for example, when it is determined that the vehicle speed during the turning degree increase period is lower than the US limit value, the camber control processing shown in FIGS. 5 to 7 shows the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR. Are adjusted to the second camber angle, but instead, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL, 2RR may be adjusted to the first camber angle.

  Next, a third operation pattern will be described with reference to FIG. FIG. 10 is a schematic diagram schematically showing a method for adjusting the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR when the vehicle 1 turns in the third driving pattern.

  As shown in FIG. 10, the third driving pattern is that the vehicle speed in the turning degree increase period and the turning degree maintenance period is lower than the US limit value, but accelerates at the corner exit, and the vehicle speed in the turning degree decrease period is US The operation pattern is such that the limit value is exceeded.

  In this case, in the camber control process shown in FIGS. 5 to 7, S1 to S9 (S9: No) → S10, S11, S14 to S19 (S19: No) → S23, S24 (S24: No) → S26 to Each process is executed in the route of S31 (S31: Yes) → S32 (S32: No) → S33.

  That is, in the turning degree increasing period, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both adjusted to the second camber angle. Furthermore, the camber angle state is maintained even in the turning degree maintenance period. Thereby, by making the camber angle of the turning inner wheel equal to the camber angle of the turning outer wheel, it is possible to prevent the yaw moment from acting on the vehicle 1 and to ensure the turning stability of the vehicle 1.

  Further, during the turning degree decreasing period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL, 2RR is adjusted to the first camber angle, and the camber angle of the turning outer wheel is maintained at the second camber angle. As a result, even if the vehicle is accelerated at the corner exit and the vehicle speed exceeds the US limit value, an understeer can be suppressed by applying a yaw moment for making the steer characteristic to an oversteer tendency on the vehicle 1.

  In the camber control processing shown in FIGS. 5 to 7, the processing other than the processing executed in the above-described route is not necessarily limited to the processing shown in FIGS. 5 to 7, and other processing is executed. You may comprise. That is, for example, when it is determined that the vehicle speed during the turning degree increase period is greater than or equal to the US limit value, the camber control processing shown in FIGS. 5 to 7 determines the camber angles of the turning inner wheels of the left and right rear wheels 2RL and 2RR. The camber angle of the turning outer wheel and the camber angle of the turning outer wheel are adjusted to the second camber angle. Instead, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both the first camber angle. You may adjust it.

  Next, a fourth operation pattern will be described with reference to FIG. FIG. 11 is a schematic diagram schematically showing a method for adjusting the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR when the vehicle 1 turns in the fourth driving pattern.

  As shown in FIG. 11, the fourth driving pattern is that the vehicle speed when entering the corner is fast and the vehicle speed in the turning degree increasing period exceeds the US limit value, but decelerating after entering the corner, and the turning degree maintaining period The driving speed is such that the vehicle speed becomes lower than the US limit value, accelerates at the exit of the corner, and the vehicle speed when the turning degree decreases exceeds the US limit value.

  In this case, in the camber control process shown in FIGS. 5 to 7, S1 to S9 (S9: Yes) → S12 to S19 (S19: No) → S23, S24 (S24: Yes) → S25 to S31 (S31: (Yes) → S32 (S32: No) → S33 Each process is executed in the path of S33.

  That is, in the turning degree increase period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL, 2RR is adjusted to the first camber angle, and the camber angle of the turning outer wheel is adjusted to the second camber angle. As a result, even if the vehicle speed at the time of entering the corner is high and the vehicle speed during the turning degree increase period exceeds the US limit value, the yaw moment for causing the steering characteristic to oversteer is applied to the vehicle 1 to suppress understeer. be able to. At the same time, the turning ability when entering the corner can be improved.

  In the turning degree maintenance period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL and 2RR is adjusted to the second camber angle, and the camber angle of the turning outer wheel is maintained at the second camber angle. This prevents the vehicle from oversteering by avoiding the tendency to oversteer the steer characteristic after the turning degree increase period even though the vehicle decelerates after entering the corner and the vehicle speed becomes lower than the US limit value. can do.

  Further, during the turning degree reduction period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL, 2RR is adjusted to the first camber angle, and the camber angle of the turning outer wheel is maintained at the second camber angle. Thus, by accelerating at the corner exit, even if the vehicle speed exceeds the US limit value, the yaw moment for making the steer characteristic oversteer tends to act on the vehicle 1, and understeer can be suppressed.

  In the camber control processing shown in FIGS. 5 to 7, the processing other than the processing executed in the above-described route is not necessarily limited to the processing shown in FIGS. 5 to 7, and other processing is executed. You may comprise. That is, for example, when it is determined that the vehicle speed during the turning degree increase period is lower than the US limit value, the camber control processing shown in FIGS. 5 to 7 shows the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR. Are adjusted to the second camber angle, but instead, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL, 2RR may be adjusted to the first camber angle.

  Further, in the camber control process shown in FIGS. 5 to 7, the process of S7 is performed as the turning start determining means according to claim 1, the process of S15 is performed as the maintenance period transition determining means, and S27 is performed as the decreasing period transition determining means. The process of S9 as the increase period vehicle speed determination means, the process of S13 as the increase period camber adjustment means, the process of S19 as the deceleration determination means, and the process of S25 as the maintenance period camber adjustment means, The process of S31 corresponds to the decrease period vehicle speed determination means, and the process of S33 corresponds to the decrease period camber adjustment means.

  Next, a second embodiment will be described with reference to FIGS. In the first embodiment, when the vehicle speed during the turning degree maintenance period is lower than the US limit value, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both adjusted to the second camber angle. In the second embodiment, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are adjusted according to the vehicle speed during the turning degree maintenance period.

  In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the description is abbreviate | omitted. Moreover, 2nd Embodiment demonstrates as what controls the vehicle 1 in 1st Embodiment by the control apparatus 200 for vehicles.

  FIG. 12 is a block diagram illustrating an electrical configuration of the vehicle control device 200 according to the second embodiment. As shown in FIG. 12, the vehicle control device 200 includes a ROM 272 and a RAM 273 instead of the ROM 72 and the RAM 73 of the vehicle control device 100 according to the first embodiment.

  The ROM 272 is a non-rewritable nonvolatile memory that stores a control program executed by the CPU 71 (for example, a program shown in the flowcharts shown in FIGS. 13 to 16), fixed value data, and the like, as shown in FIG. A first US limit value map 72a and a second US limit value map 72b, a turning state threshold value memory 72c, a first camber adjustment threshold value map 72d, a second camber adjustment threshold value map 72e, and a third camber adjustment threshold value map 272f are provided.

  The third camber adjustment threshold map 272f determines how to adjust the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR when the vehicle speed in the turning degree maintenance period is lower than the US limit value. This is a map for storing a threshold value of vehicle speed that is a criterion for the determination, and a threshold value (hereinafter referred to as “third threshold value”) lower than the US limit value stored in the second US limit value map 72b. The third camber adjustment threshold value map 272f stores the relationship between the lateral G of the vehicle 1 and the third threshold value. The smaller the lateral G is, the higher the third threshold value is. The third threshold is set to be lower as the value of becomes larger.

  The RAM 273 is a memory for storing various data in a rewritable manner when the control program is executed. As shown in FIG. 12, the turning degree increasing period US flag 73a, turning degree maintaining period US flag 73b, turning degree maintaining period A vehicle speed flag 273c is provided.

  The turning degree maintenance period vehicle speed flag 273c is a flag indicating whether or not the vehicle speed in the turning degree maintenance period is equal to or higher than a third threshold value. When the turning degree maintenance period vehicle speed flag 273c is on, the CPU 71 determines that the vehicle speed in the turning degree maintenance period is equal to or higher than the third threshold value. When the turning degree maintenance period vehicle speed flag 273c is off, the vehicle speed in the turning degree maintenance period is greater than the third threshold value. Judge that it was low.

  Next, camber control processing will be described with reference to FIGS. FIG. 13 to FIG. 16 are flowcharts showing camber control processing in the second embodiment. This process is a process that is repeatedly executed by the CPU 71 (for example, at intervals of 0.2 seconds) while the power of the vehicle control device 200 is turned on, and adjusts the camber angles of the left and right rear wheels 2RL and 2RR. Thus, the turning performance of the vehicle 1 is improved and the turning stability is ensured.

  In the camber control process according to the second embodiment, when it is determined that the turning degree increasing period US flag 73a is on (S24: Yes) as a result of the process of S24, the vehicle 1 detected in the process of S16. A third threshold value corresponding to the lateral G is acquired from the third camber adjustment threshold value map 272f (S201), and it is determined whether or not the vehicle speed calculated in the process of S18 is equal to or higher than the third threshold value (S202). As a result, when it is determined that the vehicle speed is equal to or higher than the third threshold (S202: Yes), the turning degree maintenance period vehicle speed flag 273c is turned on (S203), and the left and right rear wheels 2RL and 2RR are turned. The camber angle is adjusted to the second camber angle (S25). That is, when it is determined that the turning degree increasing period US flag 73a is on (S24: Yes), the camber angles of the turning inner wheels of the left and right rear wheels 2RL and 2RR are adjusted to the first camber angle. Since the camber angle of the turning outer wheel is adjusted to the second camber angle, the camber angle of the turning inner wheel is adjusted to the second camber angle to reduce its absolute value. Accordingly, as in the case of the first embodiment, oversteer can be prevented and the turning stability of the vehicle 1 can be ensured.

  On the other hand, if it is determined that the vehicle speed is lower than the third threshold value as a result of the process of S202 (S202: No), the turning degree maintaining period vehicle speed flag 273c is turned off (S204), and the left and right rear wheels 2RL, 2RR are turned off. The camber angle of the turning outer wheel is adjusted to the first camber angle (S205). That is, when it is determined that the turning degree increasing period US flag 73a is on (S24: Yes), the camber angles of the turning inner wheels of the left and right rear wheels 2RL and 2RR are adjusted to the first camber angle. Since the turning outer wheel is adjusted to the second camber angle, the camber angle of the turning outer wheel is adjusted to the first camber angle to increase the absolute value thereof. Thereby, the yaw moment applied to the vehicle 1 during the turning degree increase period can be reduced. Therefore, it is possible to avoid oversteering by avoiding the tendency of the steer characteristic to continue to be oversteered after the turning degree increase period even though the vehicle speed is lower than the US limit value. Further, by adjusting the camber angles of the turning inner wheel and the turning outer wheel to the first camber angle, the canvas last generated on the turning inner wheel of the left and right rear wheels 2RL and 2RR and the canvas last generated on the turning outer wheel are utilized. Thus, the grip performance of the left and right rear wheels 2RL, 2RR can be improved. As a result, the steer characteristic can be lightly understeered. Therefore, when the vehicle speed in the turning degree maintenance period is low and the influence of the steering characteristic oversteering tends to remain in the turning degree increase period, the influence can be converged to ensure the turning stability of the vehicle 1. .

  In the camber control process in the second embodiment, when it is determined that the turning degree maintenance period US flag 73b is OFF as a result of the process of S32 (S32: No), the turning degree maintenance period vehicle speed flag 273c. Is determined to be on (S206), and if it is determined that the turning degree maintenance period vehicle speed flag 273c is on (S206: Yes), the camber of the turning inner wheels of the left and right rear wheels 2RL and 2RR is determined. The angle is adjusted to the first camber angle (S33), and this camber control process is terminated. That is, if it is determined that the turning degree maintenance period vehicle speed flag 273c is on (S206: Yes), the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both set to the second camber angle. Since the adjustment is made, the camber angle of the inner turning wheel is adjusted to the first camber angle, and the camber angle of the inner turning wheel is made larger in the negative camber direction than the camber angle of the outer turning wheel. Thereby, understeer can be suppressed similarly to the case of 1st Embodiment.

  On the other hand, if it is determined as a result of the processing of S206 that the turning degree maintenance period vehicle speed flag 273c is off (S206: No), the camber angles of the turning outer wheels of the left and right rear wheels 2RL, 2RR are set to the second camber angle. (S207), and the camber control process ends. That is, when it is determined that the turning degree maintenance period vehicle speed flag 273c is off (S206: No), the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both set to the first camber angle. Since the adjustment is made, the camber angle of the turning outer wheel is adjusted to the second camber angle, and the camber angle of the turning inner wheel is made larger in the negative camber direction than the camber angle of the turning outer wheel. Thus, the canvas last generated in the turning inner wheels of the left and right rear wheels 2RL and 2RR is made larger than the canvas last generated in the turning outer wheel, and the yaw moment for causing the steering characteristic to oversteer is applied to the vehicle 1. Can do. Therefore, understeer can be suppressed.

  Further, in the camber control process in the second embodiment, when it is determined that the turning degree maintenance period US flag 73b is OFF as a result of the process of S34 (S34: No), the turning degree maintenance period vehicle speed flag 273c. Is determined to be on (S208). If it is determined that the turning degree maintaining period vehicle speed flag 273c is on (S208: Yes), the camber control process is terminated. That is, when it is determined that the turning degree maintenance period vehicle speed flag 273c is on (S208: Yes), the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both set to the second camber angle. Since it is adjusted, the camber angle state is maintained. Thereby, similarly to the case of the first embodiment, the turning stability of the vehicle 1 can be ensured following the turning degree maintaining period.

  On the other hand, if it is determined as a result of the processing of S208 that the turning degree maintenance period vehicle speed flag 273c is off (S208: No), the second threshold value corresponding to the lateral G of the vehicle 1 detected in the processing of S28 is set. While acquiring from the 2nd camber adjustment threshold value map 72e (S209), it is judged whether the vehicle speed calculated by the process of S30 is more than a 2nd threshold value (S210). As a result, when it is determined that the vehicle speed is equal to or higher than the second threshold (S210: Yes), the camber control process is terminated. That is, when it is determined that the turning degree maintenance period vehicle speed flag 273c is off (S208: No), the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both set to the first camber angle. Since it is adjusted, the camber angle state is maintained. As a result, if the vehicle speed in the turning degree decreasing period is relatively low and the effect of the oversteer tendency in the steering characteristic in the turning degree increasing period is likely to remain even after the turning degree maintaining period, the vehicle 1 continues following the turning degree maintaining period. The turning stability can be ensured.

  On the other hand, if it is determined that the vehicle speed is lower than the second threshold value or more as a result of the process of S210 (S210: No), the camber angles of the turning inner wheels of the left and right rear wheels 2RL, 2RR are adjusted to the second camber angle. (S211), and the camber control process is terminated. That is, when it is determined that the turning degree maintenance period vehicle speed flag 273c is off (S208: No), the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both set to the first camber angle. Since the adjustment is made, the camber angle of the inner turning wheel is adjusted to the second camber angle, and the camber angle of the outer turning wheel is made larger in the negative camber direction than the camber angle of the inner turning wheel. As a result, the canvas last generated on the turning outer wheels of the left and right rear wheels 2RL and 2RR is made larger than the canvas last generated on the turning inner wheel, and the yaw moment for making the steering characteristic understeer tends to act on the vehicle 1. Can do. Therefore, if the vehicle speed is low in the turning degree decreasing period and the effect of the steer characteristic oversteering tends to remain strong even after the turning degree maintaining period in the turning degree increasing period, the influence will be counteracted and oversteering will occur. Can be prevented.

  Here, with reference to FIG. 17, a method for adjusting the camber angles of the left and right rear wheels 2RL and 2RR when the vehicle 1 turns in the fifth driving pattern will be described. FIG. 17 is a schematic diagram schematically showing a method for adjusting the camber angles of the turning inner wheels and turning outer wheels of the left and right rear wheels 2RL and 2RR when the vehicle 1 turns in the fifth driving pattern.

  As shown in FIG. 17, the fifth driving pattern is that the vehicle speed when entering the corner is fast and the vehicle speed during the turning degree increase period exceeds the US limit value, but decelerates after entering the corner, and the turning degree maintaining period Is a driving pattern in which the vehicle speed is lower than the US limit value and lower than the third threshold value, and the vehicle speed in the turning degree decreasing period is also lower than the US limit value.

  In this case, in the camber control process shown in FIGS. 13 to 16, S1 to S9 (S9: Yes) → S12 to S19 (S19: No) → S23, S24 (S24: Yes) → S201, S202 (S202: No)-> S204, S205, S26-S31 (S31: No)-> S34 (S34: No)-> S208 (S208: No)-> Each process is performed by the route of S209, S210. In addition, after executing the process of S210, each process is executed in the path of S210 (S210: Yes) or the path of S210 (S210: No) → S211.

  That is, in the turning degree increase period, the camber angle of the turning inner wheels of the left and right rear wheels 2RL, 2RR is adjusted to the first camber angle, and the camber angle of the turning outer wheel is adjusted to the second camber angle. Thereby, even when the vehicle speed at the time of approaching the corner is high and the vehicle speed exceeds the US limit value, the yaw moment for making the steer characteristic to be oversteered can be applied to the vehicle 1 to suppress understeer. At the same time, the turning ability when entering the corner can be improved.

  In the turning degree maintenance period, the camber angles of the turning inner wheels of the left and right rear wheels 2RL and 2RR are maintained at the first camber angle, and the camber angle of the turning outer wheel is adjusted to the first camber angle. This prevents the vehicle from oversteering by avoiding the tendency to oversteer the steer characteristic after the turning degree increase period even though the vehicle decelerates after entering the corner and the vehicle speed becomes lower than the US limit value. can do. In addition, even if the vehicle speed during the turning degree maintenance period is lower than the third threshold and the effect of the steer characteristic oversteering tends to remain during the turning degree increase period, the influence is converged to ensure the turning stability of the vehicle 1. be able to.

  Further, in the turning degree decreasing period, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL, 2RR are both maintained at the first camber angle. Alternatively, the camber angle of the inner turning wheel is adjusted to the second camber angle, and the camber angle of the outer turning wheel is maintained at the first camber angle. As a result, if the vehicle speed in the turning degree decreasing period is relatively low and the effect of the oversteer tendency in the steering characteristic in the turning degree increasing period is likely to remain even after the turning degree maintaining period, the vehicle 1 continues following the turning degree maintaining period. The turning stability can be ensured. In addition, if the vehicle speed is very low during the turning degree decrease period and the effect of the steer characteristic oversteering tends to remain strong even after the turning degree maintenance period during the turning degree increase period, the effect will be canceled and oversteer will occur. Can be prevented. Note that, as described above, how to adjust the camber angles of the left and right rear wheels 2RL, 2RR in the turning degree decreasing period is determined according to the vehicle speed in the turning degree decreasing period.

  In the camber control process shown in FIGS. 13 to 16, processes other than the process executed in the above-described path are not necessarily limited to the processes shown in FIGS. 13 to 16, and other processes are executed. You may comprise. That is, for example, when it is determined that the vehicle speed during the turning degree increase period is lower than the US limit value, the camber control processing shown in FIGS. 13 to 16 shows the camber angles of the turning inner wheels and turning outer wheels of the left and right rear wheels 2RL and 2RR. Are adjusted to the second camber angle, but instead, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL, 2RR may be adjusted to the first camber angle.

  In addition, in the camber control processing shown in FIGS. 13 to 16, the processing of S7 is performed as the turning start determination means according to claim 1, the processing of S15 is performed as the maintenance period transition determination means, and S27 is performed as the decrease period transition determination means. The process of S9 as the increase period vehicle speed determination means, the process of S13 as the increase period camber adjustment means, the process of S19 as the deceleration determination means, and the process of S25 as the maintenance period camber adjustment means, The process of S31 corresponds to the decrease period vehicle speed determination means, and the process of S33 corresponds to the decrease period camber adjustment means.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  The numerical values given in the above embodiment are merely examples, and other numerical values can naturally be adopted. For example, the values of the first camber angle and the second camber angle described in the above embodiments can be set arbitrarily.

  In the above embodiment, when the vehicle speed during the turning degree increase period, the turning degree maintenance period, or the turning degree decrease period is equal to or higher than the US limit value, the camber angles of the turning inner wheels of the left and right rear wheels are adjusted to the first camber angle. In addition, the case where the turning outer wheel is adjusted to the second camber angle has been described. However, the present invention is not necessarily limited to this, and the camber angle of the turning inner wheel of the left and right rear wheels is adjusted to the second camber angle and the camber angle of the turning outer wheel. May be adjusted to a predetermined positive angle (positive camber state). In this case, by increasing the camber angle of the turning outer wheel in the positive camber direction than the camber angle of the turning inner wheel, the canvas last generated in the turning outer wheel of the left and right rear wheels 2RL, 2RR is generated in the turning inner wheel. The yaw moment can be applied to the vehicle 1 to make the steering characteristic oversteer tendency. Therefore, understeer can be suppressed similarly to the case of the said embodiment. Further, in this case, by adjusting the camber angle of the turning outer wheel where the ground contact load becomes higher with respect to the turning inner wheel, the yaw moment can be surely applied to the vehicle 1 and the understeer can be suppressed.

  Although the description is omitted in the above embodiment, when the vehicle speed in the turning degree increase period, the turning degree maintenance period, or the turning degree decrease period is equal to or higher than the US limit value, it is determined whether the vehicle speed is equal to or higher than a predetermined threshold value. If it is determined that the vehicle speed is greater than or equal to a predetermined threshold, the camber angle of the turning inner wheel of the left and right rear wheels is adjusted to the second camber angle, and the camber angle of the outer turning wheel is a predetermined positive angle. When the vehicle speed is determined to be lower than the predetermined threshold while adjusting to (positive camber state), the camber angle of the turning inner wheel of the left and right rear wheels is adjusted to the first camber angle and the camber angle of the turning outer wheel is adjusted. You may comprise so that it may adjust to a 2nd camber angle | corner. As a result, when it is determined that the vehicle speed is equal to or higher than the predetermined threshold, the yaw moment is surely applied to the vehicle 1 by adjusting the camber angle of the outer turning wheel where the ground contact load becomes higher with respect to the inner turning wheel. And understeer can be suppressed. Therefore, understeer can be reliably suppressed according to the vehicle speed.

  In the above-described embodiment, when the vehicle speed in the turning degree decrease period is lower than the US limit value and lower than the second threshold value, the camber angle of the left and right rear turning inner wheels is adjusted to the second camber angle and the turning outer wheels are Although the case of adjusting to one camber angle has been described, this is not necessarily limited to this, and the camber angle of the turning inner wheel of the left and right rear wheels is adjusted to a predetermined positive angle (positive camber state) and the turning outer wheel The camber angle may be adjusted to the second camber angle. In this case, by increasing the camber angle of the turning inner wheel in the positive camber direction relative to the camber angle of the turning outer wheel, the canvas last generated in the turning inner wheel of the left and right rear wheels 2RL, 2RR is generated in the turning outer wheel. The yaw moment can be applied to the vehicle 1 so as to make the steering characteristic understeer tendency. Therefore, as in the case of the above embodiment, even when the vehicle speed in the turning degree decreasing period is extremely low and the influence of the steering characteristic on the oversteering tendency is strong in the turning degree maintaining period, it is possible to prevent oversteering. Can do.

  In the above embodiment, the case where the camber angles of the left and right rear wheels 2RL and 2RR are adjusted in three patterns according to the vehicle speed when the vehicle speed in the turning degree decreasing period is lower than the US limit value has been described. However, the present invention is not limited to this, and the camber angles of the left and right rear wheels 2RL, 2RR may be adjusted in one pattern regardless of the vehicle speed during the turning degree decrease period. That is, for example, the camber angle of the turning inner wheels of the left and right rear wheels 2RL, 2RR may be adjusted to the first camber angle and the camber angle of the turning outer wheel may be adjusted to the second camber angle. Alternatively, the camber angles of the left and right rear wheels 2RL and 2RR may be adjusted in any two of the three patterns according to the vehicle speed in the turning degree decreasing period. That is, for example, when the vehicle speed in the turning degree decrease period is lower than the US limit value, it is not determined whether or not the vehicle speed is equal to or higher than the first threshold value, but only whether or not the vehicle speed is equal to or higher than the second threshold value. When it is determined that the vehicle speed is greater than or equal to the second threshold value, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL and 2RR are both adjusted to the second camber angle, while the vehicle speed is set to the second threshold value. When it is determined that the camber angle is lower, the camber angle of the turning inner wheels of the left and right rear wheels 2RL and 2RR may be adjusted to the second camber angle and the camber angle of the turning outer wheel may be adjusted to the first camber angle.

  In the above embodiment, when the vehicle 1 turns in the first to fifth driving patterns, each process is executed in any route in the camber control process shown in FIGS. 5 to 7 or 13 to 16. However, the processing other than the processing executed in the described route is not necessarily limited to the processing shown in FIG. 5 to FIG. 7 or FIG. 13 to FIG. 16, and other processing is executed. You may comprise. That is, for example, when it is determined in the first driving pattern that the vehicle speed during the turning degree increase period is lower than the US limit value, the camber angles of the turning inner wheels and the turning outer wheels of the left and right rear wheels 2RL and 2RR in the above embodiment. Are adjusted to the second camber angle, but instead, the camber angles of the turning inner wheel and the turning outer wheel of the left and right rear wheels 2RL, 2RR are both the first camber angle and a predetermined positive angle (positive camber). (Condition) may be adjusted.

  In the above embodiment, as a method of acquiring the US limit value in the turning degree increasing period, the road information of the traveling path of the traveling destination is acquired by the navigation device 82, and when the corner exists in the traveling destination, the corner radius The US limit value corresponding to the acquired corner radius is acquired from the first US limit value map 72a. However, the present invention is not necessarily limited to this, and the turning degree maintaining period and the turning degree decreasing period are described. Similar to the method of acquiring the US limit value, the side G of the vehicle 1 is detected without using the navigation device 82, and the US limit value corresponding to the side G is acquired from the second limit value map 72b. You may comprise. However, as the method of acquiring the US limit value in the turning degree increasing period, as described in the above embodiment, the method of acquiring the US limit value corresponding to the corner radius from the first US limit value map 72a is preferable. In this case, since the US limit value can be acquired in advance before the vehicle 1 enters the corner, the camber angles of the left and right rear wheels 2RL and 2RR during the turning degree increase period can be adjusted at an early stage. .

  In the above embodiment, a case has been described in which it is determined based on the operation speed of the steering 63 whether the turning state of the vehicle 1 is the turning degree increasing period, the turning degree maintaining period, or the turning degree decreasing period. However, the present invention is not necessarily limited to this, and it may be configured to determine the state of the turning degree increasing period, the turning degree maintaining period, or the turning degree decreasing period by another method. As another method, for example, the operation amount of the steering 63, the lateral G of the vehicle 1, or the current position of the vehicle 1 and road information on the travel path of the travel destination acquired by the navigation device 82 are exemplified.

  When the determination method is the operation amount of the steering 63, the vehicle 1 goes straight when the operation speed of the steering 63 increases (or decreases) in the + direction from 0 and exceeds a predetermined value | θ |. It is determined that the state has changed from the state to the turning state. Then, after the operation amount of the steering 63 increases (or decreases in the − direction) from 0 to exceed the predetermined value | θ |, the time differential value of the operation amount is larger than the positive predetermined value θ1 ′. The turning state of the vehicle 1 until it becomes smaller is the turning degree increasing period, and after the time differential value of the operation amount of the steering 63 becomes smaller than the positive predetermined value θ1 ′, the time differential value of the operation amount is negative. The turning state of the vehicle 1 until it becomes smaller than the predetermined value θ2 ′ is set as the turning degree maintenance period. Further, the turning state of the vehicle 1 from when the time differential value of the operation amount of the steering 63 becomes smaller than the negative predetermined value θ2 ′ until the operation amount becomes 0 is defined as a turning degree decreasing period.

  When the determination method is the current position of the vehicle 1 and the road information of the travel path to be traveled acquired by the navigation device 82, the current position of the vehicle 1 reaches a predetermined position Pm that is turned by a predetermined distance from the corner entrance. The turning state of the vehicle 1 is set to the turning degree increasing period, and the turning state of the vehicle 1 is maintained until the current position of the vehicle 1 reaches the predetermined position Pe that is turned from the predetermined position Pm by a predetermined distance. The period. Further, the turning state of the vehicle 1 until the current position of the vehicle 1 reaches the corner exit from the predetermined position Pe is defined as a turning degree decreasing period.

  In the above embodiment, a case is described in which it is determined whether or not the vehicle speed during the turning degree maintaining period is equal to or higher than the US limit value, and the camber angles of the left and right rear wheels 2RL and 2RR are adjusted in a pattern according to the determination result. However, the present invention is not necessarily limited to this, and it may be configured to determine which pattern the camber angles of the left and right rear wheels 2RL, 2RR are adjusted by other methods. As another method, for example, the driver may change the rotational speed (speed) of power transmission from the front and rear G of the vehicle 1, the operation amount of the brake pedal 62, or the power transmission from the wheel drive device 3 to the left and right front wheels 2FL and 2FR. The deceleration of the vehicle 1 based on operation of the transmission (not shown) operated is illustrated.

  When the determination method is the deceleration of the vehicle 1 based on the longitudinal G of the vehicle 1, in the camber control processing shown in FIGS. 5 to 7 or 13 to 16, the vehicle 1 is replaced with the processing of S16 to S19. Is detected, and it is determined whether the detected front and rear G is equal to or greater than a predetermined threshold value in the deceleration direction. As a result, when it is determined that the front-rear G is greater than or equal to the predetermined threshold value in the deceleration direction, the processing from S23 to S25 is executed, whereas when the front-rear G is determined to be smaller than the predetermined threshold value in the deceleration direction. Performs the processing from S20 to S22.

  When the determination method is the deceleration of the vehicle 1 based on the operation amount of the brake pedal 62, in the camber control process shown in FIGS. 5 to 7 or 13 to 16, the brake is replaced with the process of S16 to S19. The operation amount of the pedal 62 is detected, and it is determined whether or not the detected operation amount is equal to or greater than a predetermined operation amount. As a result, when it is determined that the operation amount of the brake pedal 62 is greater than or equal to the predetermined operation amount, the processing from S23 to S25 is executed, while the operation amount of the brake pedal 62 is determined to be smaller than the predetermined operation amount. If so, the processing from S20 to S22 is executed.

  When the determination method is the deceleration of the vehicle 1 based on the operation state of the transmission, the transmission is replaced with the camber control process shown in FIGS. 5 to 7 or 13 to 16 instead of the processes of S16 to S19. Is detected, and it is determined whether or not the detected operation is a deceleration operation for decelerating the rotational speed (speed) of power transmission from the wheel driving device 3 to the left and right front wheels 2FL and 2FR. As a result, when it is determined that the transmission has been decelerated, the processing from S23 to S25 is executed, while when it is determined that the transmission has not been decelerated, the processing from S20 to S22 is performed. To do.

  In the above embodiment, the case where the front wheels 2FL and 2FR and the rear wheels 2RL and 2RR are all configured in the same manner has been described. However, the present invention is not necessarily limited to this. For example, as shown in FIG. , 2RR may be configured to include two types of treads of the first tread 21 and the second tread 22. In this case, the first tread 21 is arranged inside the vehicle 1, the second tread 22 is arranged outside the vehicle 1, and the second tread 22 is made of a material having higher hardness than the first tread 21. The first tread 21 is configured to have a higher gripping force (high grip characteristic) than the second tread 22, while the second tread 22 has a lower rolling resistance than the first tread 21 (low rolling). (Characteristic) is preferable. Thereby, by adjusting the camber angle of the rear wheels 2RL and 2RR to the first camber angle, the high grip characteristic of the first tread 21 can be exhibited and the grip performance of the rear wheels 2RL and 2RR can be improved. As a result, the turning stability of the vehicle 1 can be ensured. On the other hand, by adjusting the camber angles of the rear wheels 2RL and 2RR to the second camber angle, the low rolling characteristics of the second tread 22 can be exhibited and fuel consumption can be reduced. FIG. 18 is a schematic diagram schematically showing the vehicle 1.

  In the above embodiment, the case where the front wheels 2FL, 2FR and the rear wheels 2RL, 2RR are all configured in the same manner has been described. However, the present invention is not necessarily limited to this. For example, the width of the tread of the front wheels 2FL, 2FR is The rear wheels 2RL and 2RR may be configured to have a width wider than the width of the tread. In this case, since the width of the tread of the front wheels 2FL and 2FR is made wider than the width of the tread of the rear wheels 2RL and 2RR, the friction coefficient with respect to the road surface of the front wheels 2FL and 2FR is set to the friction with respect to the road surface of the rear wheels 2RL and 2RR. It can be larger than the coefficient. As a result, the braking force can be improved. Further, in the above embodiment in which the front wheels 2FL and 2FR are drive wheels, the acceleration performance can be improved. On the other hand, since the width of the tread of the rear wheels 2RL and 2RR is narrower than the width of the tread of the front wheels 2FL and 2FR, the rolling resistance of the rear wheels 2RL and 2RR can be made smaller than the rolling resistance of the front wheels 2FL and 2FR. This can save fuel consumption.

  Further, as a method for making the rear wheels 2RL and 2RR have a lower rolling resistance than the front wheels 2FL and 2FR, a method of making the width of the tread of the rear wheels 2RL and 2RR narrower than the width of the tread of the front wheels 2FL and 2FR. However, the present invention is not limited to this, and other methods may be adopted.

  For example, as another method, the tread of the rear wheels 2RL and 2RR is made of a material harder than the tread of the front wheels 2FL and 2FR, and the tread of the front wheels 2FL and 2FR is gripped more than the tread of the rear wheels 2RL and 2RR. The first method of making the tread of the rear wheels 2RL, 2RR has a lower rolling resistance than the tread of the front wheels 2FL, 2FR (low rolling resistance) The 2RR tread pattern is a lower rolling resistance pattern than the front wheel 2FL, 2FR tread pattern (for example, the tread pattern of the front wheels 2FL, 2FR is a lag type or block type, and the rear wheel 2RL, 2RR tread The second method is to change the air pressure of the rear wheels 2RL and 2RR to the front wheels 2FL and 2FR. A third method for making the pressure higher than the air pressure, a fourth method for making the thickness of the tread of the rear wheels 2RL and 2RR thinner than the thickness of the tread of the front wheels 2FL and 2FR, or the first to first The fourth method and the fifth method in which a part or all of the above methods (methods of varying the tread width) are combined are exemplified.

  In the above embodiment, the case where the width of the tread of the rear wheels 2RL and 2RR is set to the same width as the width of the tread of the front wheels 2FL and 2FR has been described. By combining a part or all of the method 5, the rear wheels 2RL and 2RR can be made to have a lower rolling resistance than the front wheels 2FL and 2FR.

  Further, when the width of the tread of the rear wheels 2RL and 2RR is made narrower than the width of the tread of the front wheels 2FL and 2FR, the width of the tread of the rear wheels 2RL and 2RR is preferably configured as follows. That is, the value (L / R) obtained by dividing the tire width L ([mm]) by the tire outer diameter R ([mm]) is preferably larger than 0.1 and smaller than 0.4 (0. 1 <L / R <0.4), more preferably larger than 0.1 and smaller than 0.3 (0.1 <L / R <0.3).

100, 200 Vehicle control device 1 Vehicle 2 Wheel 2FL Front left wheel (part of wheel)
2FR Right front wheel (part of the wheel)
2RL Left rear wheel (part of wheel)
2RR Right rear wheel (part of the wheel)
44 Camber angle adjusting device 44RL RL motor (part of camber angle adjusting device)
44RR RR motor (part of camber angle adjustment device)
62 Brake pedal (deceleration operation member)
63 Steering (turning operation member)
S5 Increase period threshold acquisition means S6, S14, S26 Steering angle acquisition means S7 Turning start determination means S9 Increase period vehicle speed determination means S13 Increase period camber adjustment means S15 Maintenance period transition determination means S19 Deceleration determination means, maintenance period vehicle speed determination means S25 Maintenance Decrease period camber adjustment means S27 Decrease period transition determination means S29 Decrease period threshold acquisition means S31 Decrease period vehicle speed determination means S33 Decrease period camber adjustment means

Claims (5)

A vehicle control device used for a vehicle, comprising: a wheel composed of left and right front wheels and left and right rear wheels; and a camber angle adjusting device that independently adjusts the camber angles of the left and right rear wheels,
The vehicle control device includes:
A turning start determining means for determining whether the vehicle has changed from a straight traveling state to a turning state;
A maintenance period transition judging means for judging whether the turning state of the vehicle has transitioned from an increasing period in which the degree of turning increases to a maintenance period in which the turning degree is maintained at a predetermined turning degree;
Decreasing period transition determining means for determining whether the turning state of the vehicle has transitioned from the maintenance period to a decreasing period in which the turning degree decreases;
An increase period vehicle speed determining means for determining whether or not the vehicle speed of the vehicle exceeds a predetermined threshold when it is determined by the turning start determining means that the state of the vehicle has changed from a straight traveling state to a turning state;
When the vehicle speed determining means determines that the vehicle speed of the vehicle exceeds a predetermined threshold, the camber angle adjusting device is operated to set the camber angle of the turning inner wheel of the left and right rear wheels to the turning outer wheel. An increasing period in which the camber angle of the left and right rear wheels is adjusted in the negative camber direction so that the camber angle is larger than the camber angle of the left and right rear wheels, or the camber angle of the left and right rear wheels is adjusted in the positive camber direction so as to be larger than the camber angle of the inner turning wheel. Camber adjustment means;
Deceleration determining means for determining a deceleration state of the vehicle when it is determined by the maintenance period transition determining means that the turning state of the vehicle has transitioned from the increase period to the maintenance period;
When the deceleration determining means determines that the vehicle has decelerated, the camber angle adjusting device is operated to adjust the camber angles of the left and right rear turning inner wheels or the turning outer wheels adjusted by the increasing period camber adjusting means. A maintenance period camber adjusting means for adjusting at least the absolute value to be smaller,
Decreasing period vehicle speed determining means for determining whether the vehicle speed of the vehicle exceeds a predetermined threshold when it is determined by the decreasing period transition determining means that the turning state of the vehicle has transitioned from the maintenance period to the decreasing period When,
When the vehicle speed determining means determines that the vehicle speed of the vehicle exceeds a predetermined threshold, the camber angle adjusting device is operated to set the camber angles of the turning inner wheels of the left and right rear wheels as absolute values. Adjust to the negative camber direction so that it is larger than the camber angle of the turning outer wheel, or adjust the camber angle of the left and right rear turning outer wheels so that the absolute value becomes larger. And a reduction period camber adjusting means for adjusting in the positive camber direction so as to be larger than the camber angle of the turning inner wheel. Steering angle acquisition means for acquiring the steering angle of the vehicle,
The turning start determination means has a steering angle acquired by the steering angle acquisition means exceeding a predetermined value, or a time differential value of the steering angle acquired by the steering angle acquisition means exceeds a positive predetermined value. The vehicle determines that the vehicle has changed from a straight traveling state to a turning state,
The maintenance period transition determination means is configured to change the turning state of the vehicle from the increase period to the maintenance period when the time differential value of the steering angle acquired by the steering angle acquisition means is smaller than a predetermined positive value. Judge that it has transitioned,
The decrease period transition determining means is configured to change the turning state of the vehicle from the increase period to the maintenance period when the time differential value of the steering angle acquired by the steering angle acquisition means becomes smaller than a predetermined negative value. The vehicle control device according to claim 1, wherein it is determined that a transition has occurred. An increase period threshold value acquisition means for acquiring the threshold value which is a determination criterion of the determination by the increase period vehicle speed determination means based on the turning degree of the vehicle;
The decrease period threshold value acquisition means for acquiring the threshold value, which is a determination criterion of the decrease period vehicle speed determination means, based on the turning degree of the vehicle is provided. Vehicle control device. Whether or not the vehicle speed of the vehicle exceeds a predetermined threshold according to the turning degree of the vehicle when it is determined by the maintenance period transition determining means that the turning state of the vehicle has transitioned from the increase period to the maintenance period Maintenance period vehicle speed judging means for judging
4. The deceleration determination unit determines that the vehicle has decelerated when the vehicle speed determination unit determines that the vehicle speed of the vehicle does not exceed a predetermined threshold value. The vehicle control device according to any one of the above. The said deceleration judgment means judges that the said vehicle decelerated when it is judged that the operation member operated by the driver | operator in order to decelerate the said vehicle was operated. The vehicle control device according to any one of the above.

Images