WO2011048865A1 - 車両運動制御装置 - Google Patents
車両運動制御装置 Download PDFInfo
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- WO2011048865A1 WO2011048865A1 PCT/JP2010/063515 JP2010063515W WO2011048865A1 WO 2011048865 A1 WO2011048865 A1 WO 2011048865A1 JP 2010063515 W JP2010063515 W JP 2010063515W WO 2011048865 A1 WO2011048865 A1 WO 2011048865A1
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- deceleration
- acceleration
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- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
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- B60T7/04—Brake-action initiating means for personal initiation foot actuated
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- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
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Definitions
- the present invention relates to a vehicle motion control device that performs acceleration / deceleration control of a vehicle when entering a curve and / or exiting a curve.
- Patent Document 1 As a conventional vehicle motion control device that performs acceleration / deceleration control during cornering (curving), for example, a device described in Patent Document 1 is known.
- An object of the technology described in Patent Document 1 is to provide a vehicle motion control device that clarifies specific control timing guidelines for accelerator, steer, and brake operations, and that can perform motion control based on the guideline. .
- a control means for controlling the steering of the vehicle or the longitudinal acceleration / deceleration using at least the jerk information of the longitudinal or lateral direction of the vehicle is intended to provide.
- Non-Patent Document 1 describes a guideline for setting the acceleration / deceleration before and after the vehicle according to the lateral jerk of the vehicle.
- Patent Document 2 is known as a method for automatically performing this deceleration.
- Non-Patent Document 1 describes a basic policy for calculating the longitudinal acceleration of a vehicle in accordance with the lateral jerk of the vehicle in consideration of the acceleration / deceleration control timing of Patent Document 1.
- the load on the front wheels is increased by the inertial force acting on the center of gravity having the ground height by decelerating when the lateral acceleration increases. While increasing the cornering stiffness of the front wheel, the load on the rear wheel is reduced and the cornering stiffness of the rear wheel is reduced.
- acceleration is performed when the lateral acceleration decreases, thereby moving the load to the rear wheel side and stabilizing the vehicle.
- Patent Document 2 information such as the curve radius ahead and the distance to the curve is acquired using a navigation, etc., the speed at which the target lateral acceleration is set in advance, that is, the target speed is determined, and the distance to the curve is determined. In the meantime, a deceleration is generated so that the current vehicle speed becomes the target vehicle speed, and the driving load on the driver is reduced.
- Patent Document 1 and Non-Patent Document 1 adding the longitudinal acceleration of the vehicle according to the lateral jerk generated in the vehicle always in this way is control in consideration of the driver's intention when entering the curve. It may not always be.
- Patent Document 1 it is necessary to decelerate for the purpose of reducing the kinetic energy before entering the curve. Therefore, when the methods described in Patent Document 1 and Non-Patent Document 1 are applied to Patent Document 2, the deceleration amount that decelerates according to the lateral jerk and the deceleration amount before the curve cannot be matched, and the vehicle enters the curve. When doing so, a step of deceleration may occur, which may give the driver a jerky feeling in the vehicle behavior.
- the acceleration is started from the timing when the lateral jerk is 0, but the period during which the acceleration is applied is only the period during which the lateral jerk is negative.
- acceleration increases the load on the front wheels and decreases the load on the rear wheels, and as a result, the restoring yaw moment increases from the viewpoint of vehicle kinematics. This is reasonable and effective from the viewpoint of stabilizing the vehicle.
- the acceleration after acceleration is too high or vice versa because there is no speed constraint condition just by accelerating only during the period when the lateral jerk is negative. It may be too low for the driver to feel uncomfortable.
- the present invention has been made in order to solve such a problem, and more safely, less uncomfortable, and with an appropriate control amount, deceleration control at the time of entering a curve (from before the driver starts turning the steering wheel) It is an object of the present invention to provide a vehicle motion control device that enables acceleration control at the time of deceleration control) and / or escape from a curve.
- the vehicle motion control device of the present invention that solves the above-mentioned problems is a vehicle motion control device that performs acceleration / deceleration control of a vehicle when entering a curve and / or when exiting a curve, according to the lateral jerk of the vehicle.
- Vehicle speed control for calculating the deceleration to be generated in the vehicle before the curve, taking into account the acceleration / deceleration calculated by the lateral motion linked acceleration / deceleration calculating means for calculating the longitudinal acceleration / deceleration of the vehicle Means.
- the vehicle body speed control means calculates the pre-curve deceleration in consideration of the acceleration / deceleration calculated by the lateral motion linkage acceleration / deceleration calculation means, so that it does not overdecelerate and can reduce the driver's uncomfortable feeling.
- FIG. 1 is a configuration diagram of a vehicle in Embodiment 1.
- FIG. FIG. 2 is a block diagram illustrating a control configuration in the first embodiment.
- 3 is a flowchart for explaining a control flow in the first embodiment.
- the schematic diagram for showing the estimation method of the entrance and minimum radius in a front curve using a stereo camera.
- FIG. 6 is a configuration diagram of a vehicle in a second embodiment.
- FIG. 5 is a block diagram showing a control configuration in Embodiment 2. The figure explaining the means which solves the discontinuity of the deceleration which arises by coexistence of the brake operation of a driver, and lateral motion linkage acceleration / deceleration.
- FIG. 1 shows a configuration example of a vehicle.
- the vehicle 0 includes wheels 1a, 1b, 1c, 1d, wheel speed sensors 2a, 2b, 2c, 2d, a vehicle speed calculator 3, a steering angle sensor 4, an accelerator pedal opening detection sensor 5, a vehicle
- the motion control device 6, the driving force generation means 7, hydraulic brakes 8 a, 8 b, 8 c, 8 d, a stereo camera 9, and a hydraulic brake unit 10 are configured.
- each component will be described in detail.
- Rotational speed of the wheels 1a, 1b, 1c, 1d is detected by wheel speed sensors 2a, 2b, 2c, 2d.
- the vehicle speed calculator 3 calculates the vehicle speed V, which is the speed in the traveling direction of the vehicle 0, based on the rotational speed of each wheel detected by the wheel speed sensors 2a, 2b, 2c, and 2d of each wheel.
- the vehicle speed calculator 3 first calculates the speeds Va, Vb, Vc, Vd in the traveling direction of each wheel by multiplying the angular velocity of each wheel by the rotational radius of the wheel.
- the vehicle speed V may be an average value of the speeds Va, Vb, Vc, and Vd.
- a vehicle speed V may be a signal from a ground vehicle speed sensor using a millimeter wave radar or the like.
- the steering angle sensor 4 detects the steering angle of the vehicle 0, and for example, a generally known rotary encoder type is used.
- the steering angle ⁇ detected by the steering angle sensor 4 is input to the vehicle motion control device 6.
- the accelerator pedal opening detection sensor 5 detects the amount by which the driver depresses the accelerator pedal, and may be a general sensor that outputs a voltage in place of an electrical signal by a hall element in the sensor, for example.
- the vehicle motion control device 6 includes an electric circuit and a microcomputer or only a microcomputer, and includes a lateral motion linkage acceleration / deceleration calculation unit 11, a vehicle body speed control device 12, and an acceleration / deceleration synthesis unit 13 as control configurations.
- the deceleration calculated by the vehicle motion control device 6 is sent to the hydraulic brake unit 10 as a hydraulic pressure command value.
- the deceleration calculation logic before the curve will be described later.
- the hydraulic brake unit 10 is, for example, one that performs pump-up BBW (Brake-by-Wire) control.
- the hydraulic brake unit 10 has a hydraulic servo that sends hydraulic pressure to the hydraulic brakes 8a, 8b, 8c, and 8d of each wheel.
- the driver's brake operation amount is determined by comparing the master cylinder pressure / pedal stroke with the command master cylinder pressure converted from the acceleration / deceleration command value from the vehicle motion control device 6 and the command wheel cylinder pressure, and setting the maximum value to the hydraulic servo. Use command value.
- the hydraulic servo controls the hydraulic pressure to achieve the command value and sends the hydraulic pressure to the brakes 8a, 8b, 8c, 8d of each wheel.
- the driving force generating means 7 is a means for driving the vehicle 0, and is composed of, for example, an engine (internal combustion engine), a transmission gear, and a differential. Or you may comprise using a motor instead of an engine.
- a signal from the accelerator pedal opening detection sensor 5 is sent to an engine control unit (not shown), and the opening / closing of the throttle valve is controlled based on this information.
- the stereo camera 9 is composed of two monocular cameras arranged on the left and right sides of the housing, and realizes a function of recognizing the environment around the vehicle.
- the number of cameras is not limited to two, and three or more cameras may be provided.
- the housing is attached, for example, in the vicinity of a room mirror in the passenger compartment, and includes a CPU, RAM, ROM, and the like for processing captured images.
- the distance LPC from the vehicle 0 to the curve entrance and the minimum radius Rmin in the forward curve are calculated from the distance to the object around the road and the like by the left and right parallax.
- a detailed description of the image processing method will be omitted because it is also described in known documents (for example, Japanese Patent Application Laid-Open No. 2008-240166).
- FIG. 2 shows a control configuration in this embodiment.
- the output of each sensor is sent to the lateral motion linkage acceleration / deceleration calculation unit 11 and the vehicle body speed control device 12.
- the lateral motion linkage acceleration / deceleration calculation unit 11 uses the information from the steering angle sensor 4 and the vehicle speed calculator 3 to calculate the lateral motion linkage acceleration / deceleration Gx_dGy, which is the longitudinal acceleration / deceleration linked to the lateral motion of the vehicle 0.
- the vehicle body speed control device 12 calculates the deceleration to be decelerated before the curve and outputs it to the acceleration / deceleration combining unit 13.
- the acceleration / deceleration synthesis unit 13 synthesizes the lateral motion linkage acceleration / deceleration Gx_dGy calculated by the lateral motion linkage acceleration / deceleration calculation unit 11 and the deceleration Gx_preC calculated by the vehicle body speed controller 12 and outputs the resultant as a final deceleration. To do.
- step S10 the distance LPC from the vehicle 0 to the curve entrance C ahead and the curve minimum radius Rmin of the curve are calculated (curve information acquisition means).
- a communication device mounted on a curve mirror may transmit information on the distance to the front curve and radius information (curve information) to the vehicle 0.
- the stereo camera 9 is used. A method for estimating the curve from the arrangement of the lane marker and obstacles ahead will be described.
- FIG. 4 shows a steady turning section (circular curve section) of a curve through a straight section (previous section: points A to C, section length LPC) through a curve transition section (relaxation curve section: points C to D, section length LCL). : A scene at the time of entering a curve, entering points D to E and radius Rmin) is assumed.
- the stereo camera 9 has reference points (referred to as segments) (X 0 , X 1 , X 2 ) provided at regular intervals on the extension line X of the vehicle central axis along the longitudinal direction of the vehicle 0. , X 3 , X 4 ...), The distance to the left and right road ends is detected.
- the distances between the extension line X of the vehicle center axis and the road center line are y 0 , y 1 , y 2 , y 3 .
- the information to be calculated is the distance LPC from the vehicle 0 to the transition section and the radius Rmin of the steady turning section.
- the transition section (section CD) is approximated by a clothoid curve on a general road. This represents the trajectory of the road center line in a coordinate system with point C as the origin.
- Equation 1 Can be expressed as If the radius Rmin is sufficiently larger than the relaxation curve length LCL, the second and subsequent terms of Equations 1 and 2 can be ignored. Therefore, the relationship between x and y is expressed by the following cubic function.
- Equation 3 is a parameter of the clothoid curve and is represented by a radius Rmin and a clothoid curve length LCL.
- this cubic function has the following relationship.
- the transient section distance LCL is uncertain due to the characteristics of the clothoid curve. With a camera, radar, or the like, it is impossible to detect the length of this transition section unless the vehicle actually travels along a curve, and in practice it is estimated from the road structure.
- the design speed is set for each road that is running, and the transitional section distance (relaxation curve length) and the turning radius are set according to the design speed. ing.
- the turning radius varies for each road, but since the difference for each transition section is relatively small, there is no problem even if the transition section distance shown in Table 1 is actively used. Further, if the information of the curve radius ahead is obtained from the map information by navigation or the like, the transient section distance LCL can be calculated and the characteristics of a series of curves can be grasped with high accuracy.
- the transient section is approximated to a clothoid curve, and further approximated to a cubic function, but there are other known methods for calculating the distance to the transient section, the transient section distance, and the curve radius, This is not the case.
- the signals output from the stereo camera 9 are the distance LPC from the vehicle 0 to the curve entrance C and the minimum curve radius Rmin.
- step S20 it is determined whether or not there is a curve ahead of the vehicle 0.
- FIG. 5A is a graph relating to the distance LPC to the curve entrance C, the broken line is the distance LPC output from the stereo camera 9, and the alternate long and short dash line is the estimated distance Lv to the curve entrance C by time integration of the current vehicle speed V. .
- a pair of dotted lines shown above and below the estimated distance Lv in FIG. 5 (a) is an allowable upper limit Lv_upper and an allowable lower limit Lv_lower, and each is obtained by adding and subtracting a predetermined value from the estimated distance Lv.
- FIG. 5B shows a calculation method of the reliability Con, and the reliability Con is calculated as follows.
- Con_z in the above formulas 8 and 9 is a value one sampling time before the reliability Con. That is, the reliability Con is increased by a constant c during the time (t1 to t2, t3 to t4) during which the distance LPC exists within the range between the allowable upper limit Lv_upper and the allowable lower limit Lv_lower.
- the constant c may be a fixed value or may be variable depending on the situation.
- the reliability Con is reset to zero.
- the reliability Con exceeds the threshold value Con_th in this way, it is determined that a curve has been detected, a curve detection flag is set as shown in FIG. 5C, and it is determined Yes in step S20. If is not established, it is determined as No.
- the means for determining the curve integrates the reliability Con only while the distance LPC to the curve entrance C detected by the stereo camera 9 is within a predetermined range from the distance based on the time integration of the current vehicle speed V.
- the degree Con becomes equal to or higher than a predetermined value Con_th, the curve is determined.
- the time constant of the primary low-pass filter may be increased in order to reduce the fluctuation of the minimum curve radius Rmin.
- step S40 it is determined whether the accelerator opening detected by the accelerator pedal opening detection sensor 5 is equal to or less than a predetermined value Apo_c. As a result, it is determined whether or not the driver intends to decelerate. If the accelerator opening exceeds the predetermined value Apo_c, it is determined that the accelerator is depressed and there is an intention to accelerate or keep at a constant speed, and No is set.
- the predetermined value Apo_c may be used as a threshold value to determine the flag, or the deceleration gain calculated in step S90 when the accelerator opening APO_th is less than or equal to a certain accelerator opening APO_th as shown in FIG.
- a table in which the gain is set to 0 and the interval is continuously changed may be used. Thereby, the sudden change of the deceleration to output can be reduced.
- step S50 it is determined whether the current vehicle speed V is equal to or higher than a predetermined speed Vmin. If it is extremely low speed, the deceleration control will not be involved in the first place. If the current vehicle speed V is equal to or higher than the predetermined speed Vmin, Yes is set and the process proceeds to step S60. This can also suppress sudden changes in deceleration by using a table equivalent to the accelerator opening described above.
- step S41, step S51, and step S70 will be described.
- the determination may be basically performed by the same method as in step S40 and step S50.
- lateral motion linkage acceleration / deceleration Gx_dGy is calculated.
- the lateral motion linkage acceleration / deceleration Gx_dGy is calculated from the lateral jerk velocity dGy and the lateral acceleration Gy from the acceleration / deceleration pointer linked to the lateral motion described in Non-Patent Document 1.
- An example of the calculation method is shown below. In this embodiment, a method for calculating the lateral acceleration Gy and the lateral jerk dGy from the steering angle ⁇ and the vehicle speed V and calculating the lateral motion linkage acceleration / deceleration Gx_dGy from the calculated lateral acceleration Gy and the lateral jerk dGy will be described.
- the steering angle signal In order to calculate the lateral jerk signal from the steering angle ⁇ , it is necessary to calculate the lateral jerk velocity dGy and differentiate the signal in the same manner as the acceleration sensor.
- the phase of the steering angle signal is more advanced than the lateral acceleration Gy in a low frequency region that is important in vehicle motion, the steering angle signal is differentiated from the lateral acceleration Gy generated in the vehicle 0 to obtain a lateral jerk velocity dGy. Even if a low-pass filter having a larger time constant is applied, the response delay can be reduced.
- a method of calculating the lateral acceleration Gy and the lateral jerk dGy from the steering angle ⁇ will be shown.
- a vehicle model that outputs a yaw rate r [rad / s] having a speed dependency with a steering angle ⁇ [deg] and a vehicle speed V [m / s] as inputs is used.
- This yaw rate r is expressed by a yaw angular velocity gain constant Gr ⁇ (0) not taking into account the secondary response delay of the vehicle 0 expressed by the following equation 11 and a secondary delay response with respect to the steering angle ⁇ .
- Tr, ⁇ , and ⁇ n are parameters specific to the vehicle, and are experimentally identified values.
- Gr ⁇ (0) the gain constant
- D ⁇ in Equation 12 above is the rate of change of the skid angle, but if it is a motion within a linear region of tire force, d ⁇ may be negligible and almost ignored.
- the calculated lateral acceleration Gy is discretely differentiated and passed through a low-pass characteristic filter to obtain a lateral jerk velocity dGy.
- the time constant Tlpf of the low-pass characteristic filter at this time takes into account the second-order response delay. Further, in order to match the phase, the lateral acceleration Gy passed through the low-pass characteristic filter having the same time constant Tlpf is used.
- the lateral motion linkage acceleration / deceleration Gx_dGy of the vehicle 0 is calculated according to the following Equation 13.
- the above formula 13 is basically a value obtained by multiplying the lateral jerk velocity dGy by the gain Cxy and adding a first-order delay. More generally, even in the form represented by the following mathematical formula (14) in which the lateral jerk speed dGy is multiplied by the proportional coefficient Cxy, acceleration / deceleration with little discomfort associated with the lateral motion can be realized.
- the proportionality coefficient Cxy in the above-described equation 14 may be changed based on the range of the speed V, the lateral acceleration Gy, the skid state, and the like.
- the case of calculating using the detection values of each sensor shown in FIG. 2 has been described as an example, but in addition to this, the lateral jerk calculated from the actual lateral acceleration using an acceleration sensor may be used.
- the lateral acceleration calculated by multiplying the actual yaw rate and the vehicle speed by using the yaw rate sensor may be differentiated by the above-described method and used as the lateral jerk speed.
- the lateral motion linkage acceleration / deceleration Gx_dGy may be calculated and combined using both the lateral jerk velocity dGy (feed forward) calculated from the steering angle ⁇ and the actual lateral jerk velocity dGy (feedback). As described above, the lateral motion linkage acceleration / deceleration Gx_dGy corresponding to the lateral jerk dGy is calculated in step S70.
- step S60 a method for calculating the estimated lateral jerk Gx_dGypre in the curve transition section CD will be described in step S60.
- a straight traveling section AC, a transition section CD, and a steady turning section DE are assumed.
- the point where the driver releases the accelerator is B, and the curve entrance is C.
- FIG. 8 is a graph showing the lateral acceleration Gy generated as the vehicle moves to the curve section CDE.
- the transition section CD starts from the curve entrance C, and the lateral acceleration Gy gradually increases.
- the inclination at this time is the lateral jerk dGy that is the first-order differential value of the lateral acceleration Gy, and the lateral acceleration Gy_max (theoretically at the time t and point D where the vehicle travels between CDs. Can be expressed as follows using the maximum lateral acceleration).
- the lateral acceleration Gy increases at a constant rate when the driver increases the steering angle ⁇ at a constant steering speed. Accordingly, even if the lateral jerk velocity dGy, which is the rate at which the lateral acceleration Gy increases, is approximated by a linear function as shown in FIG.
- the present invention is not limited to this embodiment when the shape of the transition section CD can be detected with high accuracy from information such as navigation and the multidimensional function is more suitable than the linear function.
- step S80 a calculation method of the pre-curve deceleration Gx_preC in consideration of the estimated lateral motion linkage acceleration / deceleration Gx_dGypre before the curve will be described.
- the distance between the vehicle 0 and the curve entrance C at this time is LPC
- the vehicle speed is V0
- the deceleration to be generated is Gx_preC
- Vent is the speed at which point C is reached with the pre-curve deceleration Gx_preC. This can be expressed as an expression:
- the vehicle is decelerated by the estimated lateral motion linkage acceleration / deceleration Gx_dGypre, and as a result, the vehicle speed becomes Vmin at the point D.
- This can be expressed as an expression:
- the vehicle speed Vmin can be expressed as follows using the minimum curve radius Rmin and the maximum lateral acceleration (target lateral acceleration) Gy_max.
- the driver can change the deceleration before the curve and the magnitude of the deceleration in the transition section by changing ⁇ by operating a switch in the vehicle.
- This method is considered effective because there is a preference for the magnitude of the deceleration before the driver's curve and it cannot be determined uniquely.
- the stereo camera 9 When viewed from another viewpoint, for example, the stereo camera 9 obtains information on the outside world as numerical information other than the distance LPC to the curve entrance C and the curve minimum radius Rmin as numerical information.
- the amount of deceleration on the road that is, by reducing ⁇
- the degree of familiarity is digitized, and if you can determine that you are used to it, decelerate before the curve
- By reducing the amount, that is, by increasing ⁇ it is considered that the driver is less likely to feel slack.
- step S90 an acceleration / deceleration command value Gx_order to be finally output is calculated based on the pre-curve deceleration Gx_preC and the lateral motion linkage acceleration / deceleration Gx_dGy.
- Fig. 9 shows the transition of deceleration at points A to D.
- 9A shows the pre-curve deceleration Gx_preC, the lateral motion linkage acceleration / deceleration Gx_dGy, and the acceleration / deceleration command value Gx_order
- FIG. 9B shows the pre-curve deceleration Gx_preC and the lateral motion linkage acceleration / deceleration. Indicates Gx_dGy.
- the pre-curve deceleration Gx_preC expressed by the above equation 21 and the lateral motion linkage acceleration / deceleration Gx_dGy expressed by the above equation 14 change as shown in FIGS. 9 (a) and 9 (b). That is, the pre-curve deceleration Gx_preC rises at the point B before the curve, the deceleration fluctuates due to the detection variation of the stereo camera 9 and ends at the point C at the entrance of the curve.
- the acceleration / deceleration command value Gx_order is assumed to pass through a primary low-pass filter or the like before the curve deceleration Gx_preC.
- the driver's accelerator operation acceleration opening speed
- the deceleration should be started earlier. If the accelerator is slowly returned, the deceleration may be started later.
- the acceleration / deceleration command value Gx_order may take the maximum value of the pre-curve deceleration Gx_preC and hold that value.
- the lateral movement linkage acceleration / deceleration Gx_dGy on the deceleration side starts to rise from point C. Ideally, it instantaneously rises to a value equal to the pre-curve deceleration Gx_preC, but there is a section where the lateral jerk speed dGy increases in CC ′ until the steering speed of the driver becomes constant, as shown in FIG. Transition to.
- the lateral motion linkage acceleration / deceleration Gx_dGy is lower than when the deceleration is not kept constant, but the section CC ′ is also short in time and practically used. No problem.
- the lateral motion linkage acceleration / deceleration Gx_dGy decreases.
- the acceleration / deceleration command value Gx_order is controlled to decrease as the lateral motion linkage acceleration / deceleration Gx_dGy decreases.
- the acceleration / deceleration command value Gx_order may be equal to the lateral motion linkage acceleration / deceleration Gx_dGy as shown in FIG.
- Such a series of controls allows the acceleration / deceleration command value Gx_order to change smoothly from the pre-curve AC to the transition section CD, although there are some fluctuations, and can reduce the sense of incongruity due to fluctuations in deceleration.
- an actuator acceleration / deceleration means that realizes deceleration of the acceleration / deceleration command value Gx_order is output to the brake actuator.
- an actuator acceleration / deceleration means
- the acceleration / deceleration command value Gx_order can be achieved by the engine brake.
- the command value of the lateral motion linkage acceleration / deceleration Gx_dGy may be faster than the response speed of the engine brake, but a delicate deceleration can be achieved by the brake actuator faster than the response of the engine brake.
- Example 2 Next, Example 2 will be described.
- the driver operation at the time of entering the curve and the coexistence of the lateral motion linkage acceleration / deceleration Gx_dGy and the acceleration control at the time of exiting the curve will be described.
- FIG. 11 shows a configuration example of the vehicle. 11 includes wheels 1a, 1b, 1c, 1d, wheel speed sensors 2a, 2b, 2c, 2d, a vehicle speed calculator 3, a steering angle sensor 4, an accelerator pedal opening detection sensor 5, a vehicle motion control device 6, Driving force generator 7, hydraulic brakes 8a, 8b, 8c, 8d, hydraulic brake unit 10, combine sensor 18 (see FIG. 12) capable of detecting longitudinal acceleration, lateral acceleration, yaw rate, generator 14, battery 15, front wheel motor (Not shown) is a general hybrid vehicle including a rear wheel motor 16.
- each component will be described, but the description of the same parts as those in the first embodiment will be omitted.
- the driving force generation means 7 is an engine of an internal combustion engine in the present embodiment.
- the front wheels 2a and 1b are driven via a transmission and a differential, and the generator 14 directly connected to the front wheel shaft is obtained from the engine 7. Driven by power.
- the electric power generated at this time becomes electric power for driving the battery 15 and is sent to the rear wheel motor 16 via the differential.
- a hybrid controller (not shown) sends commands to components such as an engine, a generator, a motor, and a battery to perform a desired operation.
- the brake pedal 17 digitizes the driver's brake operation amount with a stroke sensor or the like and sends it to the vehicle motion control device 6.
- the vehicle motion control device 6 outputs the driving force and brake command value of each wheel to the hybrid controller, so that the front wheels 1a and 1b are driven by the motor and engine, the regeneration is performed only by the front wheel motor, and the rear wheel motor 16 is driven. Can be driven and regenerated, and braked by the hydraulic brake actuators 8a to 8d.
- the brake pedal operation of the driver can be digitized and the braking force can be distributed to the motor and the hydraulic brake.
- FIG. 12 shows a control configuration in this embodiment.
- the output of each sensor is sent to the lateral motion linkage acceleration / deceleration calculation unit 11 and the vehicle body speed control device 12.
- the lateral motion linkage acceleration / deceleration calculation unit 11 calculates the lateral motion linkage acceleration / deceleration Gx_dGy, which is a longitudinal acceleration / deceleration linked to the lateral motion, using the steering angle sensor 4, the vehicle speed sensor 3, and the combine sensor 18, and the acceleration / deceleration synthesis unit 13. And the acceleration / deceleration to be generated in the transition section is calculated based on the output.
- the acceleration / deceleration command value Gx_order holds the driver's brake command value (deceleration). Then, the larger one compared with the lateral motion linkage acceleration / deceleration Gx_dGy is output as the acceleration / deceleration command value Gx_order.
- the brake command value of the driver is held at the time when the lateral motion linkage acceleration / deceleration Gx_dGy exceeds a preset threshold value q0.
- the driver's brake command value and the acceleration / deceleration command value by the vehicle motion control device 6 are continuous, and the driver's uncomfortable feeling can be reduced.
- FIG. 12 shows a control configuration in this embodiment.
- the output of each sensor is sent to the lateral motion linkage acceleration / deceleration device 11 and the vehicle body speed control device 12.
- the vehicle speed calculator 3, the steering angle sensor 4, and the combine sensor 18 are used to calculate the acceleration associated with the lateral motion of the vehicle 0 and output it to the acceleration / deceleration synthesizer 13. Further, the estimated lateral jerk in the transition section where the forward transition section moves straight ahead is calculated, and the acceleration to be generated in the transition section is calculated based on the estimated lateral jerk.
- the control operation will be described in detail.
- a scene is assumed when exiting a curve from a steady turning section to a straight traveling section.
- Points F to G are steady turning sections, and the curve radius does not change in this section.
- the driver performs an accelerator operation to keep the vehicle speed Vmin constant.
- Points G to H are transient sections (relaxation curve sections), and the curve radius gradually increases from the minimum curve radius Rmin according to the distance.
- an acceleration side lateral motion linkage acceleration / deceleration Gx_dGy is added to the vehicle 0 according to Equation 14 as the lateral acceleration Gy decreases.
- Patent Document 1 and Non-Patent Document 1 describe that it is empirically known that the gain Cxy of Expression 14 takes a fixed value of 0.3 to 0.5. However, this is a case where the lateral motion linkage acceleration / deceleration Gx_dGy is negative, that is, calculated as a deceleration command value, and cannot be clearly determined during acceleration.
- the lateral jerk speed dGy generated in the forward transition section GH is estimated from the state of traveling in the steady turning section FG, and the speed Vout to be finally reached at the point H which is the curve exit.
- a method for determining the gain Cxy_accel at that time will be described.
- Fig. 16 shows the transition of lateral acceleration in the section FI.
- the driver performs an accelerator operation so as to maintain the vehicle speed Vmin.
- the lateral acceleration Gy is constant unless the vehicle speed Vmin and the turning radius Rmin change.
- the relaxation curve section GH is a transition section between the steady turning section FG and the straight traveling section HI of the curve, and the lateral acceleration Gy acting on the vehicle 0 decreases as it moves toward the curve exit.
- the decreasing speed of the lateral acceleration Gy at this time is the lateral jerk speed dGy, which can be estimated using a linear function as follows.
- Mathematical formula 22 can be expressed by the same formula, although there is a difference in the sign from mathematical formula 15. As specified in the first embodiment, when the driver turns back the steering at a constant steering speed in an ideal transition section formed of a clothoid curve, the lateral acceleration Gy decreases at a constant value. Therefore, it can be considered that a great sense of incongruity does not occur by the method of approximating with a linear function as shown in FIG.
- Equation 22 the estimated lateral motion linkage acceleration / deceleration Gx_dGypre estimated to occur in the transient section GH is expressed by the following equation:
- the estimated lateral motion linkage acceleration / deceleration Gx_dGypre is output to the vehicle body speed control device 12 as an output of the lateral motion linkage acceleration / deceleration calculation unit 11.
- the vehicle 0 is accelerated from the vehicle speed Vmin to the vehicle speed Vout by the estimated lateral motion linkage acceleration / deceleration Gx_dGypre. This can be expressed as an expression:
- the acceleration output by the lateral motion linkage acceleration / deceleration calculation unit 11 is:
- the vehicle speed can be returned from the vehicle speed Vout to the vehicle speed Vent until the vehicle reaches the H point (curve end point) only by traveling in the transition zone GH while stepping on the accelerator that maintained the vehicle speed Vmin. it can. As a result, it is possible to reduce the driver operation that has to change the speed in accordance with the driving situation.
- FIG. 17 shows the lateral motion linkage acceleration / deceleration Gx_dGy, which is the acceleration when traveling in the transition zone GH.
- the lateral motion linkage acceleration / deceleration Gx_dGy is increased / decreased unless the driver's steering, the behavior of the vehicle 0, and the road surface state are ideal, and if this is used as a command value to the engine control unit as it is, it is generated in the vehicle 0.
- Longitudinal acceleration also increases and decreases, which causes a deterioration in ride comfort.
- the maximum value of the lateral motion linkage acceleration / deceleration Gx_dGy is maintained while the driver is stepping on the accelerator pedal, like the acceleration / deceleration command value Gx_order in FIG.
- the acceleration / deceleration command value Gx_order is controlled to be 0. In this way, the influence of the detection noise of the sensors such as the lateral jerk speed dGy and the steering angle ⁇ can be reduced, and the fluctuation in the longitudinal acceleration is also reduced, so that the riding comfort is also improved.
- Example of display 18 and 19 show the interface of the vehicle motion control device 6.
- the push button type knob shown in FIG. 18 is pushed to bring the system On. In this state, the vehicle motion control device operates.
- the driver can arbitrarily select one of the safety mode (Sd), the normal mode (No), and the sports mode (Sp).
- Sd safety mode
- No normal mode
- Sp sports mode
- ⁇ 1 in the safety mode
- ⁇ 2 in the normal mode
- ⁇ 3 in the sport mode.
- the acceleration / deceleration command value Gx_order is negative, a display indicating orange and deceleration control is performed, and if the acceleration / deceleration command value Gx_order is no longer negative, the display returns to the system On display. Further, if the acceleration / deceleration command value Gx_order is positive in the system On display state, a light blue color and display during acceleration control are displayed. If the acceleration / deceleration command value Gx_order is not positive, the system On display is restored.
- mode switching may be performed by voice recognition, or switches may be collected on a handle.
- FIG. 20 shows an example of the yaw moment generated in the vehicle 0 when accelerating the section GH according to Equation 26.
- front wheel drive is performed
- rear wheel k: 1-k.
- the yaw moment Mz shown in this figure is positive in the direction of promoting the turning of the vehicle 0. Accordingly, the yaw rate is also positive in the counterclockwise direction.
- the acceleration command value represented by Equation 26 increases a negative yaw moment, generally called a restored yaw moment, in order to make the yaw rate generated during turning zero (0) during the transitional period GH. This is caused by the difference in lateral force between the front and rear wheels and the position of the center of gravity when there is no acceleration.However, if acceleration is performed in this section, the lateral force difference will become larger due to the load moving from the front wheels to the rear wheels. The restoring yaw moment generated at this time is further increased. Accordingly, it is possible to return to the straight traveling state earlier.
- the yaw moment may be a yaw moment that promotes turning from a negative value called a restoration yaw moment at a certain time.
- the gain Cxy may be changed in order to change the magnitude of the acceleration to be generated due to such a difference in driving method.
- Example 3 Next, Example 3 will be described.
- the vehicle speed control device 12 will be described with respect to an embodiment when combined with control for keeping the vehicle speed constant (hereinafter referred to as “cruise control”).
- the vehicle motion control device 6 of this embodiment includes a lateral motion linkage acceleration / deceleration calculation unit 11, a vehicle body speed control device 12, and an acceleration / deceleration synthesis unit 13.
- the vehicle body speed control device 12 issues a torque command to an engine control unit (not shown) so as to maintain the vehicle speed based on the vehicle speed calculated by the vehicle speed calculator 3.
- the engine control unit calculates a throttle opening that can achieve the command torque at the current engine speed, and controls the throttle valve.
- FIG. 21A shows the vehicle speed
- FIG. 21B shows On / Off of the cruise control switch as a flag f_CC_On.
- On a numerical value other than 0 is set (for example, 1).
- the cruise control switch is operated by a driver or the like attached to the steering wheel.
- FIG. 21 (c) shows the accelerator pedal opening
- FIG. 21 (d) shows the brake pedal opening. Since the flag f_CC_On is 0 in the period from t0 to ta, the vehicle 0 is in a normal state, and if the driver does not operate the accelerator or the brake, the vehicle speed is decelerated by the running resistance or the engine brake. Thereafter, at a predetermined timing ta, the driver changes the cruise control switch from Off to On. Thereby, the flag f_CC_On becomes other than 0 and the cruise control is started.
- the vehicle speed control device 12 sets the vehicle speed when the flag f_CC_On changes from 0 to 1 (ta) as a target vehicle speed and maintains it on condition that the driver does not operate the accelerator pedal or the brake pedal at this time. Thus, feedback control between the current vehicle speed and the target vehicle speed is performed, and a cruise control command torque is calculated and sent to the engine control unit.
- the vehicle speed controller 12 always compares the driver requested driving force with the cruise control command torque and outputs the larger one. Therefore, next, when the driver depresses the accelerator from this state (tb), the result of the accelerator speed being read by the vehicle speed control device and converted into the driver request torque is larger than the cruise control command torque for maintaining the vehicle speed. Outputs the driver request torque to the engine control unit. As a result, the vehicle speed increases.
- the vehicle speed at that time is stored, the speed is set as the target vehicle speed, and the current Carry out feedback control of vehicle speed.
- the vehicle speed at the moment when the brake is released is set as the target vehicle speed
- feedback control is performed so as to maintain the vehicle speed
- the cruise control command torque is output to the engine control unit.
- the cruise control switch After that, if the driver turns the cruise control switch off, the control for maintaining the vehicle speed is not performed, and the vehicle speed decreases according to the engine brake. Therefore, when the cruise control switch is On, the torque required to make the current vehicle speed constant, the driver's accelerator operation, the brake operation, the driver request torque calculated from at least one of Expressions 14 and 26 are compared, and the torque is large. Is output. Further, when the driver request torque is negative (during braking, etc.), the driver request torque is given priority. With such an operation, the operation burden on the driver can be reduced.
- the distance LPC_d to the curve ahead is calculated by the stereo camera.
- the reliability Con is integrated only while this is within the range between the allowable upper limit Lv_upper and the allowable lower limit Lv_lower of the estimated distance Lv to the curve by time integration of the current vehicle speed V.
- Con_th it is determined that a curve has been detected, and a curve detection flag is set. In the first embodiment, it is determined whether the driver is turning off the accelerator when this flag is set.
- the steady turn is performed in the steady turn section FG, and the acceleration Gx_dGy of Expression 26 is calculated from the point G with the gain of Cxy_accel of Expression 25. Then, the vehicle travels in the transition zone GH so that the predetermined speed Vout is reached at the H point.
- the predetermined escape speed Vout when the cruise control switch is On, the escape speed Vout may be the speed V0 when the deceleration is started, that is, when the curve detection flag is set.
- the vehicle body speed control device has a curve detection means for detecting a curve ahead of the vehicle, and the distance to the curve entrance detected by the curve detection means is an initial value curve at a certain time.
- the curve detection reliability is greater than when the vehicle is outside the predetermined range. It is said.
- the vehicle body speed control device calculates the distance to the curve entrance detected by the curve detection means by the time integration of the own vehicle speed with the initial value as the distance to the curve entrance at a certain time. When the distance to the estimated curve is outside a predetermined range, the curve detection reliability is maintained.
- the vehicle body speed control device calculates the distance to the curve entrance detected by the curve detection means as the initial value of the distance to the curve entrance at a certain time by time integration of the own vehicle speed.
- the reliability of curve detection when it is within a predetermined range from the distance to the estimated curve is integrated, and it is determined that there is a curve ahead when the reliability exceeds a preset value It is said.
- the vehicle body speed control device is configured to keep the driver requested braking / driving torque converted from at least one of the accelerator opening of the vehicle, the brake operation amount, and the lateral motion linkage acceleration / deceleration and the current vehicle speed constant.
- the constant vehicle speed torque required to achieve this is calculated, and if each torque has the same sign, the larger absolute value is output, and if it is different, the driver requested braking / driving force is output. .
- the vehicle motion control apparatus maintains the curve radius detected by the curve detection means and increases the time constant when passing through the primary low-pass filter while it is determined that a curve exists.
- the correction is performed according to at least one of the allowable increase / decrease range with respect to time.
- the lateral motion linkage acceleration / deceleration calculating means calculates the maximum lateral acceleration acting on the vehicle during the curve traveling based on the curve information and the vehicle speed, and the estimation is performed based on the maximum lateral acceleration. It is characterized by calculating the lateral jerk speed.
- This vehicle speed can be the vehicle speed when the amount of depression of the accelerator pedal before the curve falls below a preset threshold value.
- the vehicle speed can be the vehicle speed at the moment when it is determined by the curve detection means that a curve exists in front of the vehicle. Further, the vehicle speed can be the speed when the calculation of the lateral motion linkage acceleration / deceleration is started by the lateral motion linkage acceleration / deceleration calculation device.
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Abstract
Description
1 車輪
2 車輪速センサ
3 車速算出器
4 操舵角センサ
5 アクセルペダル開度センサ
6 車両運動制御装置
7 駆動力発生手段
8 ブレーキ
9 ステレオカメラ(カーブ認識手段)
10 油圧ブレーキユニット
11 横運動連係加減速算出部
12 車体速制御装置
13 加減速度合成部
14 発電機
15 バッテリ
16 後輪モータ
<車両構成>
図1に車両の構成例を示す。車両0は、図1に示すように、車輪1a、1b、1c、1d、車輪速センサ2a、2b、2c、2d、車速算出器3、操舵角センサ4、アクセルペダル開度検出センサ5、車両運動制御装置6、駆動力発生手段7、油圧ブレーキ8a、8b、8c、8d、ステレオカメラ9、油圧ブレーキユニット10で構成される。以下各構成部の詳細な説明をする。
図2に本実施例における制御構成を示す。上記に示したように、各センサの出力を横運動連係加減速算出部11と車体速制御装置12に送る。横運動連係加減速算出部11では、操舵角センサ4、車速算出器3からの情報を用いて、車両0の横運動に連係した前後加減速度である横運動連係加減速度Gx_dGyを算出して加減速度合成部13に出力し、さらに前方の直進からカーブへ移行する過渡区間(緩和曲線区間)における車両0の横加々速度を推定して推定横加々速度Gx_dGypreとして車体速制御装置12に出力する。
図3を用いて具体的に制御フローを説明する。
次に、実施例2について説明する。実施例2では、カーブ進入時のドライバ操作と横運動連係加減速度Gx_dGyの共存、及びカーブ脱出時の加速制御について説明する。
図11に車両の構成例を示す。図11の車両は、車輪1a、1b、1c、1d、車輪速センサ2a、2b、2c、2d、車速算出器3、操舵角センサ4、アクセルペダル開度検出センサ5、車両運動制御装置6、駆動力発生装置7、油圧ブレーキ8a、8b、8c、8d、油圧ブレーキユニット10、前後加速度、横加速度、ヨーレイトを検出可能なコンバインセンサ18(図12参照)、発電機14、バッテリ15、前輪モータ(図示せず)、後輪モータ16で構成される一般的なハイブリッド車である。以下、各構成部品の説明をするが、実施例1と同様の部分の記述は省く。
本実施例では、ドライバが自分のブレーキ操作でカーブへ進入するシーンを想定する。非特許文献1に示される技術では、ドライバがカーブ手前(AC区間)からブレーキペダルを踏み、過渡区間CDでブレーキ操作をやめてしまう場合に、例えば図13(b)に示すように、ドライバのブレーキ指令値に基づく減速度と、横運動連係加減速度Gx_dGyとの間に段差が生じ、乗り心地が悪化するおそれがある。
図12に本実施例における制御構成を示す。各センサの出力は横運動連係加減速装置11と車体速制御装置12に送られる。横運動連係加減速装置11では、車速算出器3、操舵角センサ4、コンバインセンサ18を用いて、車両0の横運動に連係した加速度を算出し、加減速度合成部13に出力する。また、さらに前方の過渡区間から直進へ移行する過渡区間における推定横加々速度を算出し、それに基づいて過渡区間で生成すべき加速度を算出する。以下、詳細に制御動作を説明する。
図17は、過渡区間GHを走行しているときの加速度である横運動連係加減速度Gx_dGyを示している。このときの横運動連係加減速度Gx_dGyは、ドライバの操舵や車両0の挙動、路面状態が理想的でない限り増減を繰り返し、これをこのままエンジンコントロールユニットへの指令値とすれば、車両0に発生する前後加速度も増減を繰り返し、乗り心地の悪化を招く。
図18、図19に車両運動制御装置6のインターフェースを示す。まず、図18に示す押しボタン式のツマミを押して、システムOnの状態にする。この状態で車両運動制御装置が動作する。
図20に区間GHを数式26に従って加速走行した時の車両0に生成されるヨーモーメントの一例を示す。符号kは前後輪駆動力配分比であり、前輪:後輪=k:1-kで表される。例えばk=1であれば前輪駆動、k=0なら後輪駆動である。この図で示されるヨーモーメントMzは、車両0の旋回を促進する方向を正としている。従って、ヨーレイトも左回りを正とする。
次に、実施例3について説明する。実施例3では、車体速制御装置12において、自車速を一定に保つ制御(以降クルコン(Cruise Control)と明記)と組み合わせた時の実施例に関して記述する。
Claims (14)
- カーブ進入時、および/または、カーブ脱出時に車両の加減速制御を行う車両運動制御装置であって、
カーブ進入時に車両に作用する横加々速度に応じて前記車両の横運動に連係した前後加減速度である横運動連係加減速度を算出する横運動連係加減速算出手段と、
該横運動連係加減速算出装置によって算出される横運動連係加減速度を考慮して、前記カーブ前に前記車両に生成すべきカーブ前減速度を算出する車体速制御装置と、
を備えることを特徴とする車両運動制御装置。 - 前記カーブのカーブ半径と車両からカーブまでの距離の情報を含むカーブ情報を取得するカーブ情報取得手段を有し、
前記横運動連係加減速算出手段は、前記カーブ情報取得手段が取得した前記カーブ情報に基づいて前記横加々速度を推定した推定横加々速度を算出し、該推定横加々速度に基づいて前記横運動連係加減速度を推定した推定横運動連係加減速度を算出し、
前記車体速制御装置は、前記横運動連係加減速算出手段によって算出された前記推定横運動連係加減速度に基づいて前記カーブ前減速度を算出することを特徴とする請求項1に記載の車両運動制御装置。 - 前記横運動連係加減速算出手段は、前記カーブ情報と車速に基づいて、カーブ走行中に車両に作用する最大横加速度を算出し、該最大横加速度に基づいて前記推定横加々速度を算出することを特徴とする請求項2に記載の車両運動制御装置。
- 前記横運動連係加減速算出手段は、前記横加速度が前記最大横加速度まで増加する割合を一次方程式で近似することにより前記推定横加々速度を算出することを特徴とする請求項3に記載の車両運動制御装置。
- 前記車体速制御装置により算出されたカーブ前減速度と、前記横運動連係加減速算出手段により算出された横運動連係加減速度に基づいて、前記車両の加減速度を制御する加減速度指令値を算出する加減速度合成手段を有することを特徴とする請求項1に記載の車両運動制御装置。
- 前記加減速度合成手段は、前記カーブ前減速度の最大値を前記加減速度指令値として保持することを特徴とする請求項5に記載の車両運動制御装置。
- 前記加減速度合成手段は、前記車体速制御装置により算出された前記カーブ前減速度の最大値と、前記横運動連係加減速算出手段により算出された横運動連係加減速度とを比較して、いずれか大きい方を前記加減速度指令値とすることを特徴とする請求項5に記載の車両運動制御装置。
- 前記加減速度合成手段は、前記横運動連係加減速度の減少に従って前記加減速度指令値を減少させることを特徴とする請求項6に記載の車両運動制御装置。
- ブレーキペダルの操作量に基づいて前記車両の減速度を制御するブレーキ指令値を算出するブレーキ指令値算出手段を有し、
該ブレーキ指令値算出手段により算出されたブレーキ指令値と、前記横運動連係加減速算出手段により算出された横運動連係加減速度に基づいて、前記車両の加減速度を制御する加減速度指令値を算出する加減速度合成手段を有することを特徴とする請求項1に記載の車両運動制御装置。 - 前記加減速度合成手段は、前記ブレーキペダルが操作中でかつ前記横運動連係加減速算出手段によって前記横運動連係加減速度が算出されていないときは、前記ブレーキ指令値算出手段によって算出されたブレーキ指令値を前記加減速度指令値とし、
前記ブレーキペダルの操作中に前記横運動連係加減速算出装置によって前記横運動連係加減速度の算出が開始されて、該算出された前記横運動連係加減速度が所定値以上となったときは、前記ブレーキ指令値を前記加減速度指令値として保持することを特徴とする請求項9に記載の車両運動制御装置。 - 前記加減速度合成手段は、前記ブレーキペダルの操作量が0になったときに、前記加減速度指令値と前記横運動連係加減速度とを比較して、前記加減速度指令値よりも前記横運動連係加減速度の方が減速度が低いときは、前記加減速度指令値を前記横運動連係加減速度に漸近収束させることを特徴とする請求項10に記載の車両運動制御装置。
- カーブ進入時、および/または、カーブ脱出時に車両の加減速制御を行う車両運動制御装置であって、
カーブ脱出時に車両に作用する横加々速度に応じて前記車両の横運動に連係した前後加減速度である横運動連係加減速度を算出する横運動連係加減速算出手段と、
該横運動連係加減速算出手段によって算出される前記横運動連係加減速度を考慮して、車両のカーブ脱出加速度を算出する車体速制御手段と、
を有することを特徴とする車両運動制御装置。 - 前記横運動連係加減速算出装置によって算出される前記横運動連係加減速度は、車両の横加速度が減少するカーブの過渡区間において算出された加速度の最大値に、アクセルペダルが踏まれている間だけ保持されることを特徴とする請求項12に記載の車両運動制御装置。
- 前記横運動連係加減速算出装置によって算出される前記横運動連係加減速度は、車両の横加速度が減少するカーブの過渡区間において算出された加速度の最大値に保持され、アクセル開度の減少に応じて減少されることを特徴とする請求項13に記載の車両運動制御装置。
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CN113306546A (zh) * | 2021-06-21 | 2021-08-27 | 上汽通用五菱汽车股份有限公司 | 弯道行驶加速度控制方法、acc系统及存储介质 |
CN113306546B (zh) * | 2021-06-21 | 2022-06-24 | 上汽通用五菱汽车股份有限公司 | 弯道行驶加速度控制方法、acc系统及存储介质 |
Also Published As
Publication number | Publication date |
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JP2011088576A (ja) | 2011-05-06 |
CN102596660A (zh) | 2012-07-18 |
JP5414454B2 (ja) | 2014-02-12 |
KR20120064116A (ko) | 2012-06-18 |
US20120209489A1 (en) | 2012-08-16 |
EP2492160A1 (en) | 2012-08-29 |
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