JP6194810B2 - Vehicle control apparatus and control method - Google Patents

Description

  The present invention relates to a vehicle control device and control method, and more particularly to a vehicle control device and control method provided with a braking mode for deceleration, and belongs to the field of vehicle travel control technology.

  In recent years, in vehicles equipped with automatic transmissions or continuously variable transmissions, or vehicles such as electric vehicles and hybrid vehicles using an electric motor as a travel drive source, a vehicle deceleration brake is provided separately from the drive mode for normal travel. In this case, in addition to the drive position for selecting the drive mode (hereinafter referred to as “D position”), the brake lever (for selecting the brake mode) is selected in the shift lever operation pattern. (Hereinafter referred to as “B position”).

  For example, in Patent Document 1, as shown in FIG. 9, as a shift lever operation position in a continuously variable transmission, a B position is provided adjacent to a lower part (vehicle rear side) of a D (SD) position. An invention has been disclosed in which an engine brake having a preset size is activated according to the driving state at that time when X is operated to the B position.

  Further, in Patent Document 2, as shown in FIG. 10, as a shift lever operation position in a hybrid vehicle, a B position is provided adjacent to the lower side of the D position, and a plus position and a minus position are provided on both left and right sides of the B position. And an engine brake level can be selected by operating the shift lever X ′ to the B position and then operating to either the plus or minus position. .

JP 2009-257415 A JP 09-277847 A

  By the way, in the invention described in Patent Document 1, as described above, the size of the engine brake obtained when the shift lever X is operated to the B position is determined by the driving state at that time. The size of the vehicle cannot be selected, and the requested vehicle deceleration may not be realized.

  On the other hand, according to the invention described in Patent Document 2, it is possible to select the engine brake level by operating the shift lever X ′ to the B position and further operating to the plus position or the minus position. A vehicle deceleration according to the driver's request or a deceleration close to this can be obtained.

  However, the invention described in Patent Document 2 includes a switch that detects an operation to the B position of the shift lever X ′, a switch that detects an operation to the plus position, and a switch that detects an operation to the minus position. In addition to increasing the complexity of the structure and increasing the number of parts, plus and minus positions are provided on both sides of the B position, the operating area of the shift lever X ′ for the brake mode is expanded, There is a risk that the degree of freedom in design and layout around the shift lever may be limited.

  In addition, the driver misidentifies whether the left or right position in the B position is a positive position or a negative position of the deceleration level, and the operation of the shift lever causes the situation where the increase or decrease of the deceleration changes to the opposite side. There is a possibility.

  It is an object of the present invention to solve the above-described problems in a vehicle in which a brake mode for vehicle deceleration is set and a B position for selecting the brake mode is provided in an operation pattern of a shift lever. It is an object of the present invention to realize a device capable of obtaining a vehicle deceleration according to a driver's required level while suppressing complications, an increase in the number of parts, an expansion of a shift lever operation area, a driver's erroneous operation, and the like.

  In order to solve the above-described problems, a vehicle control apparatus according to the present invention is configured as follows.

First, according to the first aspect of the present invention, a shift lever operating position of a vehicle in which a D position for selecting a drive mode and a B position for selecting a brake mode are provided adjacent to each other. A control device,
Requested deceleration level determining means for determining a requested deceleration level of the driver based on an operation between the D position and the B position of the shift lever;
Deceleration control means for controlling the reduction gear so that a larger vehicle deceleration is obtained as the required deceleration level determined by the determination means is higher,
The required deceleration level determining means reduces the required deceleration level to a first predetermined amount of vehicle reduction when a D → B operation is performed to operate the shift lever from the D position to the B position during traveling in the drive mode. The speed is determined to be level 1, and after the D → B operation, the B → D → B operation is performed again after the shift lever is returned from the B position to the D position in the vehicle deceleration state and then operated to the B position again. If the stay time at the D position during the B → D → B operation is less than or equal to a predetermined time, the vehicle deceleration is reduced by adding the second predetermined amount to the first predetermined amount. determining a level 2 speed is obtained, in the B → D → B operation, after returning from the B position to the D position, when the operation to B position after the predetermined time has elapsed is performed , And judging the request deceleration level according to the operation to its B position level 1.

  Here, the reduction gear means an in-vehicle device having a function of decelerating the vehicle, and is an automatic transmission or continuously variable transmission capable of stepwise increase control of the reduction ratio, and vehicle control by hydraulic control. A wheel brake device capable of gradual increase control of power, an alternator, a motor generator, and the like capable of gradual increase control of vehicle running resistance by deceleration regeneration control are included. Further, the first predetermined amount and the second predetermined amount for vehicle deceleration may be the same amount or different amounts.

The invention according to claim 2, in the control apparatus for a vehicle according to claim 1,
As an operation position of the shift lever, an N position for selecting a neutral mode is provided adjacent to the D position,
The B position is provided so that the operation direction of the shift lever between the D position and the D position is different from the operation direction of the shift lever between the D position and the N position, and
Only these positions are provided on the operation line of the shift lever including the D position and the B position.

On the other hand, the invention according to claim 3 is a vehicle control method in which the D position for selecting the drive mode and the B position for selecting the brake mode are provided adjacent to each other as the operation position of the shift lever. Because
A requested deceleration level determining step for determining a requested deceleration level of the driver based on an operation between the D position and the B position of the shift lever;
A deceleration control step for controlling the reduction gear so that a larger vehicle deceleration is obtained as the required deceleration level determined in the determination step is higher,
In the required deceleration level determining step, when a D → B operation for operating the shift lever from the D position to the B position is performed during traveling in the drive mode, the required deceleration level is reduced to a first predetermined amount of vehicle reduction. The speed is determined to be level 1, and after the D → B operation, the B → D → B operation is performed again after the shift lever is returned from the B position to the D position in the vehicle deceleration state and then operated to the B position again. If the stay time at the D position during the B → D → B operation is less than or equal to a predetermined time, the vehicle deceleration is reduced by adding the second predetermined amount to the first predetermined amount. determining a level 2 speed is obtained, in the B → D → B operation, after returning from the B position to the D position, the operation of the B position after the predetermined time has elapsed is performed and It is characterized by determining the required deceleration level according to the operation to its B position level 1.

  According to the first aspect of the present invention, according to the first aspect of the present invention, in the vehicle in which the D position and the B position are provided adjacent to each other as the operation position of the shift lever, during traveling in the drive mode. When the D → B operation is performed, the required deceleration level determining means determines that the required deceleration level is level 1 at which a first predetermined amount of vehicle deceleration is obtained, and the deceleration control means The speed reduction device is controlled so that one predetermined amount of vehicle deceleration is obtained, and the vehicle travels at a reduced speed of the first predetermined amount.

  In the vehicle deceleration state, when the B → D → B operation is performed after the D → B operation, that is, in order to obtain a large deceleration from the beginning, the B → When a D → B operation is performed, or after a first predetermined amount of deceleration is achieved by the D → B operation, a B → D → B operation is performed again to obtain a larger deceleration. In either case, the required deceleration level determination means determines that the required deceleration level is level 2, and the deceleration control means obtains a large vehicle deceleration by adding a second predetermined amount to the first predetermined amount. Control the speed reducer.

  Therefore, according to the present invention, the driver's required deceleration level is determined only by operating the shift lever between the D position and the B position, and the vehicle deceleration corresponding to the level can be obtained. In the vehicle control apparatus for realizing the deceleration according to the above requirement, it is not necessary to provide a plus position and a minus position on both sides of the B position as in the invention described in Patent Document 2.

  This eliminates the need for a switch for detecting the operation to these positions, simplifies the structure and reduces the number of parts, and avoids an increase in the operation area of the shift lever. The degree of freedom in design and layout is improved, and erroneous operations such as increase / decrease in deceleration are suppressed.

  When the vehicle is temporarily out of deceleration, such as when the accelerator pedal is depressed during the B → D → B operation, the driver must not request a deceleration greater than the level 1 deceleration. to decide. In this case, the change to level 2 by the B → D → B operation is not performed, and the requested deceleration level is held at level 1.

According to the first aspect of the present invention, in the B → D → B operation , when the operation to the B position is performed after a predetermined time has elapsed after returning from the B position to the D position. Therefore, since it is considered that the driver intended to return to the drive mode, the requested deceleration level determination means once cancels the deceleration level determination control, regardless of the number of operations to the previous B position. The requested deceleration level is determined to be level 1 by the operation from the D position to the next B position.

  Therefore, when the driver finishes driving in the brake mode and operates the D position to return to the drive mode and then operates the B position again, a deceleration greater than the required level occurs unexpectedly and feels strange. The situation of memorizing is avoided.

According to the second aspect of the present invention, when an N position is provided adjacent to the D position as the operation position of the shift lever, the operation direction of the shift lever between the D position and the B position is Since there is no position other than these positions on the operation line of the shift lever including the D position and the B position, which is different from the operation direction between the D position and the N position, for example, the D → B operation or the B → D → Accidentally operating to another position during the B operation, in particular, erroneously operating to the N position during the B → D operation is reliably prevented.

  In order to obtain good operability when the D → B operation and the B → D → B operation, especially when these continuous operations are performed, the operation force necessary for these operations is set as lightly as possible. However, according to the present invention, even if the operation force is set lightly, the above-described erroneous operation is effectively prevented, and light and reliable operability can be obtained.

According to the invention relating to the vehicle control method described in claim 3 , by implementing this method, an effect similar to that of the vehicle control device described in claim 1 can be obtained.

It is a perspective view which shows the shift lever of the vehicle which concerns on embodiment of this invention. It is explanatory drawing of the operation pattern of the said shift lever. 1 is a schematic control system diagram of a vehicle according to a first embodiment of the present invention. It is a flowchart which shows deceleration level determination control operation | movement. It is a flowchart which shows deceleration control operation | movement. It is explanatory drawing of the deceleration additional amount accompanying operation of a shift lever. FIG. 6 is a schematic control system diagram of a vehicle according to a second embodiment of the present invention. FIG. 5 is a schematic control system diagram of a vehicle according to a third embodiment of the present invention. It is explanatory drawing of the 1st prior art example of the operation pattern of a shift lever. Similarly, it is explanatory drawing of a 2nd prior art example.

  Hereinafter, embodiments of the present invention will be described.

  As shown in FIG. 1, a console lever 1 beside the driver's seat is provided with a shift lever 2, and the shift lever 2 has an operation position of P (parking) position, R (reverse) position, N (neutral). A position, a D (drive) position, and a B (brake) position are set. In this embodiment, positions P, R, N, and D are arranged in series from the front to the rear of the vehicle. A B position is provided on the side of the rearmost D position. The knob 2a of the shift lever 2 is provided with a lock release button 3 for allowing an operation between predetermined positions.

  FIG. 2 shows a guide plate 4 for guiding the shaft portion 2b of the shift lever 2, and according to the arrangement of the positions, a first guide groove 4a extending in the front-rear direction in which the positions P, R, N, and D are located. And a second guide groove 4b extending laterally from the D position of the rear end portion of the first guide groove 4a and having the tip at the B position.

  As shown in FIG. 2 (a), the operation from the P position to another position is defined as an operation permission condition by pressing the lock release button 3 and depressing the brake pedal. As shown in (b), for N → R operation and R → P operation, pressing the lock release button 3 is an operation permission condition. In other words, the operation between the D position and the N position and the operation between the D position and the B position are always possible unconditionally.

  FIG. 3 shows a vehicle control system according to the first embodiment of the present invention. The vehicle according to this embodiment has an engine 11 as a drive source and a function as a speed reducer that decelerates the vehicle. A step-variable transmission 12 and a differential device 14 that divides the output of the continuously variable transmission 12 and transmits it to the left and right drive wheels 13, 13, and the reduction ratio of the continuously variable transmission 12 in a vehicle deceleration state The deceleration is reduced by increasing.

  A control unit 21 for controlling the continuously variable transmission 12 to change the vehicle deceleration stepwise is provided. The control unit 21 includes the shift lever 2 in any one of P, R, N, and D. When in the position, a signal from the position sensor 22 that detects the position, a signal from the B position switch 23 that detects when the shift lever 2 is in the B position, and the accelerator pedal of the driver A signal from an accelerator opening sensor 24 for detecting the depression amount (accelerator opening) is input.

  Instead of the position sensor 22, for example, a switch may be provided for each of the P, R, N, and D positions, and a method for detecting the position of the shift lever 2 can be selected as appropriate.

  The control unit 21 determines the driver's required deceleration level based on the signals from the position sensor 22 and the B position switch 23 and the signal from the accelerator opening sensor 24, and reduces the vehicle deceleration at the determined level. A control signal for changing the reduction ratio stepwise is outputted to the continuously variable transmission 12 so that the speed can be obtained.

  Next, according to the flowcharts of FIGS. 4 and 5, the driver's requested deceleration level determination control by the control unit 21 and the reduction ratio of the continuously variable transmission 12 are set so as to obtain the determined vehicle deceleration. A specific operation of the deceleration control to be controlled will be described.

  First, the operation of the required deceleration level determination control will be described with reference to FIG. 4. First, in step S1, the control unit 21 performs D → B of the shift lever 2 based on the signals from the position sensor 22 and the B position switch 23. It is determined whether or not an operation, that is, an operation from the D position to the B position has been performed.

  If it is determined that the D → B operation has been performed, in step S2, the stay time at the D position of the shift lever 2 before the current operation to the B position is a predetermined time (for example, 1 second). It is determined whether it was the following.

  If the current operation to the B position is the first operation after traveling in the normal drive mode, the stay time of the shift lever 2 at the D position before the operation should be longer than the predetermined time. Therefore, it is determined that the current operation to the B position is the first operation after traveling in the normal drive mode. In this case, in step S3, the required deceleration level N by the operation to the B position is set to the level. 1 is determined. In step S 4, “1” is written in the memory 21 a provided in the control unit 21.

  Next, returning to step S1, it is determined again whether or not the D → B operation of the shift lever 2 has been performed, and the position is set to D while being held at the B position and by the subsequent B → D operation. In the meantime, only step S1 is repeatedly executed as it is until the next D → B operation is performed.

  If the D → B operation is performed again after the previous D → B operation, step S2 is executed again, and the stay time at the D position before the operation to the B position is less than the predetermined time. If it is less than the predetermined time, it is determined in step S5 whether or not the position before the operation to the D position in the current D → B operation is the B position.

  When the position before the operation to the D position is the B position, in other words, when the current D → B operation is the B → D → B operation, the dwell time at the D position during the operation is Since it is less than the predetermined time, it is determined that the current B → D → B operation may require a higher vehicle deceleration than the requested deceleration level 1 of the first D → B operation. To do.

  That is, when the driver requests a deceleration larger than the deceleration obtained at level 1 from the beginning, the B → D → B operation is continued from the first D → B operation, and a series of D → In the case of a B → D → B operation, the level 1 deceleration obtained by the first D → B operation is not sufficient, and when a larger deceleration is required, after the D → B operation, → D → B operation will be performed. In either case, in this case, the operation to B position after returning from B position to D position in B → D → B operation is performed immediately. Therefore, the staying time at the D position is less than the predetermined time. Therefore, in these cases, it is determined that the driver's requested deceleration level N may be greater than level 1.

  On the other hand, in the B → D → B operation, after returning from the B position to the D position, when the operation to the B position is performed again after the predetermined time has elapsed, the operation for returning from the B position to the D position. Is considered to be for the driver to finish driving in the brake mode and return to the normal drive mode. Therefore, the control unit 21 executes step S3 from step S2 and returns to B position after returning to the D position. It is determined that the operation to the position is the first D → B operation performed during traveling in the drive mode, and the required deceleration level N is determined to be level 1.

  In step S5, when the current position before the operation to the D position in the D → B operation is not the B position, that is, the current operation is operated from the P, R, or N position to the D position. If the operation is to the subsequent B position, it is considered that this is the first D → B operation for switching from the drive mode to the brake mode. In this case as well, in step S3, the required deceleration level N Is determined to be level 1.

  If it is determined that there is a possibility that the current D → B operation has been performed as a B → D → B operation for increasing the required deceleration level N as described above, the operation is further performed in step S6. During this B → D → B operation, it is determined whether or not the vehicle has been decelerated based on the signal from the accelerator opening sensor 24, and the accelerator opening is fully closed or a very small opening close thereto. Is determined to have been in a deceleration state.

  When the vehicle is temporarily decelerated due to the driver's depression of the accelerator pedal during the B → D → B operation, the return operation to the D position is for temporarily ending the brake mode. Therefore, in this case, even if the staying time at the D position is equal to or shorter than the predetermined time, the controller 21 executes the step S3 from the step S6 to reduce the request by the current B → D → B operation. The speed level N is determined as level 1.

  On the other hand, in this B → D → B operation, when the staying time at the D position is less than a predetermined time and this operation is performed while maintaining the vehicle deceleration state, the driver first It is determined that either a large deceleration is requested from the above, or that the deceleration by the previous D → B operation is insufficient and a larger deceleration is requested, and in step S7, In step S4, the required deceleration level N set in the previous D → B operation recorded in the memory 21a is read, and in step S8, 1 is added to this to increase the required deceleration level N by one step. In step S4, the new required deceleration level N is written in the memory 21a.

  When this B → D → B operation is repeated in a state where the deceleration state is maintained and the stay time at the D position is not longer than a predetermined time, steps S1, S2, S5 to S8, S4 are performed. Are repeatedly executed, and each time the value of the requested deceleration level N is increased by 1 and overwritten in the memory 21a.

  For example, when a series of D → B → D → B operations are performed during driving in the drive mode, or when a B → D → B operation is performed again after the D → B operation, N = 2. In addition, when a series of D → B → D → B → D → B operations are performed, or after a D → B operation, B → D → B operations are performed twice intermittently, N = 3. That is, the number of D → B operations under a predetermined condition becomes the required deceleration level N.

  On the other hand, the control unit 21 executes the deceleration control so that the vehicle deceleration corresponding to the level N is obtained in parallel with the determination control of the required deceleration level N as described above.

  This control is performed according to the flowchart of FIG. 5. First, in step S11, the current requested deceleration level N written in the memory 21a in step S4 of the requested deceleration level determination control is read, and then in step S12. Then, the target deceleration F of the vehicle is calculated.

  Here, the target deceleration F is incremented by a predetermined amount every time the required deceleration level N is increased by one step from 1, a first predetermined amount at level 1, a first predetermined amount + second predetermined amount at level 2, At level 3, the first predetermined amount + the second predetermined amount + the third predetermined amount.

  In this case, in this embodiment, as shown in FIG. 6, the predetermined amount of deceleration added at each level is constant, and when the value is ΔF, the target deceleration F is expressed by the equation (F = ΔF Although it is calculated according to × N), the addition amount of the deceleration due to the increase in the level may be set to be different at each level.

  In step S13, the control unit 21 outputs a control signal to the continuously variable transmission 12 serving as a reduction gear so that the target deceleration F obtained as described above is obtained. Specifically, this control signal increases the transmission ratio control hydraulic pressure of the continuously variable transmission 12 stepwise, and the reduction ratio is increased stepwise so that the vehicle deceleration increases by ΔF according to the required deceleration level N. Let

  Thus, when the shift lever is operated from the D position to the B position and shifts to the brake mode during driving in the drive mode, the driver's requested deceleration level N is determined based on the number of D → B operations. At the same time, vehicle deceleration corresponding to the level N is obtained, and deceleration traveling at a deceleration suitable for the driver's request is realized.

  According to this embodiment, in order to determine the driver's required deceleration level N, the control unit 21 only counts the number of D → B operations under a predetermined condition. Any sensor or switch that detects the operation of the shift lever to the B position may be used. For example, a positive position and a negative position of deceleration are provided on both sides of the B position, and the operation to these positions is performed. Compared with the case of providing a switch for detecting each of them, the structure is simplified and the number of parts is reduced, and the operation area of the shift lever in the brake mode can be narrowed.

  In this embodiment, the B position is provided adjacent to the D position on the side of the row of the P, R, N, and D positions arranged from the front to the rear of the vehicle. The operation direction between the positions is different from the operation direction between the D position and the B position, and there is no position other than these positions on the operation line of the shift lever including the D position and the B position. An erroneous operation to the N position or the like during the B operation or B → D → B operation is prevented. Therefore, it becomes possible to lightly set the operating force of the shift lever between the D position and the B position, and light and reliable operability can be obtained.

  The above embodiment is for a vehicle equipped with a continuously variable transmission. However, in a vehicle equipped with an automatic transmission, for example, the D → B operation is performed during driving at 6th speed. For example, if the B → D → B operation is further performed, the gear is shifted down to the fourth gear, and the shift stage may be controlled to shift down every time the required deceleration level N increases.

  Further, it is possible to control the vehicle deceleration without using the reduction ratio control of the transmission. For example, in the vehicle according to the second embodiment whose control system is shown in FIG. 7, the wheel brake device is used as the reduction device. The vehicle deceleration is controlled by the braking force.

  Also in this embodiment, the control unit 31 first operates the shift lever based on signals from the position sensor 32, the B position switch 33 and the accelerator opening sensor 34 according to the flowchart shown in FIG. The requested deceleration level N of the driver according to the is determined.

  As the deceleration control, the hydraulic control circuit 42 that controls the brake pressure supplied to the cylinders of the left and right wheel brake devices 41 and 41 is configured to realize a braking force that can obtain the vehicle deceleration at the required deceleration level N. In addition, a brake pressure control signal is output. At this time, the brake pressure or the braking force increases stepwise as the required deceleration level N increases, and a vehicle deceleration corresponding to the required deceleration level N is obtained.

  Further, the third embodiment showing the control system in FIG. 8 is applied to a hybrid vehicle equipped with a motor / generator for driving and deceleration regeneration. In this embodiment as well, the control unit 51 is similar to the above embodiments. Determines the required deceleration level N of the driver according to the operation of the shift lever, based on signals from the position sensor 52, the B position switch 53, and the accelerator opening sensor 54.

  Then, as deceleration control, a power generation control signal is output to the motor / generator 61 so that the running resistance of the vehicle by power generation is large enough to obtain the vehicle deceleration at the required deceleration level N. At this time, the power generation resistance or the vehicle running resistance of the motor / generator 61 increases stepwise as the required deceleration level N increases, and the vehicle deceleration corresponding to the required deceleration level N is obtained.

  Therefore, also in the embodiment shown in FIGS. 7 and 8, the vehicle deceleration according to the driver's required deceleration level while suppressing an increase in the operation region of the shift lever in the brake mode, addition of a position switch, and the like. Is realized.

  Note that an alternator capable of decelerating and regenerating may be used in place of the motor / generator 61 of FIG. 8. Further, the transmission gear ratio control, the wheel brake device braking force control, and the generator deceleration in each of the above embodiments may be used. It is also possible to obtain a vehicle deceleration according to the required deceleration level by appropriately combining regeneration control and the like.

  As described above, according to the present invention, in a vehicle having a brake mode, an increase in the number of parts, an increase in the operation area of the shift lever, and the like are suppressed, and therefore, it is suitable in the manufacturing technical field of this type of vehicle. May be used.

2 Shift lever 12, 41, 61 Reducer (continuously variable transmission, wheel brake device, motor / generator
Lator)
21, 51, 61 Required deceleration level determination means, deceleration control means (control unit
)

Claims (3)

A control device for a vehicle in which a D position for selecting a drive mode and a B position for selecting a brake mode are provided adjacent to each other as an operation position of a shift lever,
Requested deceleration level determining means for determining a requested deceleration level of the driver based on an operation between the D position and the B position of the shift lever;
Deceleration control means for controlling the reduction gear so that a larger vehicle deceleration is obtained as the required deceleration level determined by the determination means is higher,
The required deceleration level determining means reduces the required deceleration level to a first predetermined amount of vehicle reduction when a D → B operation is performed to operate the shift lever from the D position to the B position during traveling in the drive mode. The speed is determined to be level 1, and after the D → B operation, the B → D → B operation is performed again after the shift lever is returned from the B position to the D position in the vehicle deceleration state and then operated to the B position again. If the stay time at the D position during the B → D → B operation is less than or equal to a predetermined time, the vehicle deceleration is reduced by adding the second predetermined amount to the first predetermined amount. determining a level 2 speed is obtained, in the B → D → B operation, after returning from the B position to the D position, when the operation to B position after the predetermined time has elapsed is performed The control device for a vehicle, characterized in that to determine the required deceleration level according to the operation to its B position level 1. As an operation position of the shift lever, an N position for selecting a neutral mode is provided adjacent to the D position,
The B position is provided so that the operation direction of the shift lever between the D position and the D position is different from the operation direction of the shift lever between the D position and the N position, and
2. The vehicle control device according to claim 1, wherein only these positions are provided on the operation line of the shift lever including the D position and the B position . A vehicle control method in which a D position for selecting a drive mode and a B position for selecting a brake mode are provided adjacent to each other as operation positions of a shift lever,
A requested deceleration level determining step for determining a requested deceleration level of the driver based on an operation between the D position and the B position of the shift lever;
A deceleration control step for controlling the reduction gear so that a larger vehicle deceleration is obtained as the required deceleration level determined in the determination step is higher,
In the required deceleration level determining step, when a D → B operation for operating the shift lever from the D position to the B position is performed during traveling in the drive mode, the required deceleration level is reduced to a first predetermined amount of vehicle reduction. The speed is determined to be level 1, and after the D → B operation, the B → D → B operation is performed again after the shift lever is returned from the B position to the D position in the vehicle deceleration state and then operated to the B position again. If the stay time at the D position during the B → D → B operation is less than or equal to a predetermined time, the vehicle deceleration is reduced by adding the second predetermined amount to the first predetermined amount. It is determined that the speed is obtained at level 2, and the operation to the B position is performed after the predetermined time has elapsed after returning from the B position to the D position in the B → D → B operation. The control method for a vehicle, characterized in that to determine the required deceleration level according to the operation to its B position level 1.

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