JP6036524B2 - Vehicle control method and control device - Google Patents

Description

  The present invention relates to a vehicle control method and a control device, and more particularly to a vehicle control method and a control device having an ASL function for limiting the vehicle speed so as not to exceed an upper limit vehicle speed.

  2. Description of the Related Art Conventionally, vehicles having a vehicle speed limiting function called ASL (adjustable speed limitation) have been known for the purpose of preventing traffic accidents caused by excess vehicle speed. When the current vehicle speed approaches the preset upper limit vehicle speed, the ASL starts the vehicle speed limit so that the vehicle speed does not exceed the upper limit vehicle speed even if the driver depresses the accelerator pedal greatly. This function suppresses output.

  In a vehicle having an auto-cruise function, as disclosed in Patent Document 1, it is possible to suppress a problem that the vehicle speed increases even when the engine is operated with the throttle fully closed when traveling on a downhill road. For this reason, it is known that when the vehicle speed deviation (vehicle speed−upper limit vehicle speed> 0) between the vehicle speed and the upper limit vehicle speed becomes equal to or greater than a predetermined value, the gear stage of the transmission is shifted down.

  In other words, when driving on a downhill road, even if the engine output is limited by controlling the throttle valve to the closed side so that the vehicle speed does not exceed the upper limit vehicle speed, the upper limit vehicle speed cannot be maintained (the actual vehicle speed exceeds the upper limit vehicle speed: actual vehicle Speed> upper limit vehicle speed), regardless of the situation where the accelerator is depressed, the gear stage of the transmission is shifted down to the lower gear stage with a large gear ratio so that the engine brake is applied. .

JP 2002-29280 A (paragraph 0002)

  By the way, unlike the auto cruise function, the ASL function reduces the vehicle speed when the accelerator pedal is depressed and falls below the upper limit vehicle speed. Therefore, in a vehicle with an ASL function, the driver may keep stepping on the accelerator pedal even if it is a downhill road when trying to run at a constant speed while maintaining the upper limit vehicle speed. In this state, when the above-described auto-cruise technology of Patent Document 1 is applied, when the transmission shifts down following the engine output limit in order to maintain the upper limit vehicle speed, the driver decelerates. Although not intended, the engine brake due to the engine output limitation and the engine brake due to the shift down of the transmission occur twice, which causes a problem of feeling a great sense of incongruity (excessive deceleration).

  Therefore, the present invention provides the driver with an excessive feeling of deceleration in a vehicle with an ASL function in which the gear stage of the transmission is shifted down in addition to limiting the engine output in order to maintain the upper limit vehicle speed. An object of the present invention is to provide a control method and a control device for a vehicle having no noise.

In order to solve the above-mentioned problems, the present invention relates to an engine, an automatic transmission that transmits the rotation of the engine to the wheels while shifting the speed, a vehicle speed detection device that detects the vehicle speed, and an upper limit for setting the upper limit vehicle speed of the vehicle. When the deviation between the vehicle speed setting device and the vehicle speed detected by the vehicle speed detection device and the upper limit vehicle speed set by the upper limit vehicle speed setting device is less than a predetermined threshold, the engine output is set so that the vehicle speed does not exceed the upper limit vehicle speed. An excess determination step of determining whether or not the vehicle speed exceeds the upper limit vehicle speed even if the engine output is suppressed by the engine control device, When it is determined in the excess determination step that the vehicle speed exceeds the upper limit vehicle speed, an accelerator opening determination step for determining whether or not the accelerator opening is less than a predetermined opening, and the accelerator opening determination step When Kuseru opening is determined to be less than the predetermined opening, a downshift step of the gear stage of the automatic transmission is shifted down to the low speed side gear stage, the accelerator opening is greater than a predetermined opening degree by the accelerator operation amount determination step And a braking step of braking the vehicle by driving a brake device provided on the wheel when the vehicle is judged to be (claim 1).

  According to the present invention, in a vehicle having an ASL function for limiting the vehicle speed so as not to exceed the upper limit vehicle speed, the vehicle speed exceeds the upper limit vehicle speed even if the engine output is suppressed so that the vehicle speed does not exceed the upper limit vehicle speed (or If the accelerator opening is determined to be less than the predetermined opening, the gear position of the automatic transmission is shifted down to the low-speed gear stage. In other words, when it is determined that the accelerator opening is equal to or greater than the predetermined opening, the gear stage of the automatic transmission is not shifted down to the low speed side gear stage.

  Therefore, when the amount of depression of the accelerator pedal of the driver is relatively large, it is determined that the accelerator opening is equal to or greater than a predetermined opening, and only engine braking due to engine output restriction is generated to maintain the upper limit vehicle speed. The driver who does not intend the vehicle will not feel excessive deceleration. On the other hand, when the amount of depression of the accelerator pedal of the driver is relatively small, it is determined that the accelerator opening is less than the predetermined opening, and in order to maintain the upper limit vehicle speed, in addition to engine braking due to engine output limitation, an automatic transmission Since the engine brake is caused by the downshift, a sufficient feeling of deceleration can be given to the driver who intends to decelerate.

  As described above, according to the present invention, in order to maintain the upper limit vehicle speed, in the vehicle with an ASL function that shifts down the gear stage of the automatic transmission in addition to the limitation of the engine output, the driver is excessively decelerated. A vehicle control method that does not give a feeling is provided.

In addition, in the present invention, when the accelerator opening is determined to be greater than or equal to the predetermined opening, the brake device provided on the wheel is driven as an alternative to engine braking by downshifting of the automatic transmission. The braking of the vehicle prevents the vehicle speed from exceeding the upper limit vehicle speed (that is, the upper limit vehicle speed is maintained).

In the present invention, preferably, even if the vehicle is braked in the braking step, an excess determination step for determining whether or not the vehicle speed exceeds the upper limit vehicle speed by a predetermined vehicle speed or more, and the vehicle speed exceeds the upper limit vehicle speed in the excess determination step. when it is determined that exceeds more than a predetermined vehicle speed, and a excess after the shift-down process of shifting down a gear stage of the automatic transmission to the low speed side gear stage (claim 2).

  According to this configuration, when it is determined that the vehicle speed exceeds the upper limit vehicle speed by a predetermined vehicle speed or more even by braking the vehicle by the brake device, the gear stage of the automatic transmission is shifted down to the lower gear stage. As a result, engine braking occurs due to downshifting of the automatic transmission, so that the vehicle speed is prevented from significantly exceeding the upper limit vehicle speed.

In the present invention, Preferably, when the gear stage of the automatic transmission in the excess post downshift process is shifted down, including braking force reduction process for reducing the braking force of the vehicle in the braking process (Claim 3).

  According to this configuration, when the automatic transmission is shifted down to generate the engine brake, the braking force of the vehicle by the brake device is reduced. When the braking force of the vehicle by the device overlaps, the problem that the driver feels excessive deceleration is suppressed.

In order to solve the above problems, the present invention sets an engine, an automatic transmission that transmits the rotation of the engine to the wheels while shifting the speed, a vehicle speed detection device that detects the vehicle speed, and an upper limit vehicle speed of the vehicle. When the deviation between the vehicle speed detected by the upper limit vehicle speed setting device and the vehicle speed detected by the vehicle speed detection device and the upper limit vehicle speed set by the upper limit vehicle speed setting device is less than a predetermined threshold, the vehicle speed should not exceed the upper limit vehicle speed. An excess determination step for determining whether or not the vehicle speed exceeds an upper limit vehicle speed even when the engine output is suppressed by the engine control device, wherein the vehicle includes an engine control device that suppresses the engine output. When it is determined in the excess determination step that the vehicle speed exceeds the upper limit vehicle speed, whether or not the accelerator opening has changed by a predetermined amount or more to the decreasing side, the accelerator opening has changed to the decreasing side by a predetermined speed or more. An accelerator opening decrease determination step for determining whether or not the accelerator opening has decreased to a decrease side by a predetermined amount or more at a predetermined speed, and the accelerator opening decrease in the accelerator opening decrease determination step. And a downshifting step of downshifting the gear stage of the automatic transmission to a low speed side gear stage when a change to the side is determined ( Claim 4 ).

  According to the present invention, as in the first aspect of the invention, in a vehicle having an ASL function for limiting the vehicle speed so as not to exceed the upper limit vehicle speed, the engine output is suppressed so that the vehicle speed does not exceed the upper limit vehicle speed. However, when it is determined that the vehicle speed exceeds (or may exceed) the upper limit vehicle speed, automatic shifting occurs when the accelerator opening changes more than a predetermined amount to the decreasing side or changes more than a predetermined speed. The gear of the machine is shifted down to the lower gear. In other words, when the driver performs an operation intended to decelerate, the gear stage of the automatic transmission is shifted down to the low speed side gear stage, and when the driver is not performing an operation intended to decelerate, The gear stage of the automatic transmission is not shifted down to the low speed side.

  For this reason, when the driver is not performing an operation intended to decelerate, only engine braking due to engine output restriction occurs to maintain the upper limit vehicle speed. Does not give a feeling of slowdown. On the other hand, when the driver performs an operation intended to decelerate, in order to maintain the upper limit vehicle speed, in addition to engine braking due to engine output limitation, engine braking due to downshifting of the automatic transmission occurs. A sufficient deceleration feeling can be given to the driver who intends to drive the vehicle.

  As described above, according to the present invention, in order to maintain the upper limit vehicle speed, in the vehicle with the ASL function in which the gear stage of the automatic transmission is shifted down in addition to the limitation of the engine output, the driver feels excessive deceleration. There is provided a method for controlling a vehicle without giving

In order to solve the above-described problems, the present invention sets an engine, an automatic transmission that transmits the rotation of the engine to the wheels while shifting the speed, a vehicle speed sensor that detects the vehicle speed, and an upper limit vehicle speed of the vehicle. Achieves an upper limit vehicle speed setting switch, an accelerator position sensor that detects the accelerator position, a throttle valve that adjusts the intake air amount of the engine independently of the accelerator position, and multiple gear stages of the automatic transmission When a deviation between a vehicle speed detected by the vehicle speed sensor and an upper limit vehicle speed set by the upper limit vehicle speed setting switch is less than a predetermined threshold A controller that suppresses engine output by controlling at least the throttle valve so that the vehicle speed does not exceed the upper limit vehicle speed. Even if the output is suppressed, it is determined whether the vehicle speed exceeds the upper limit vehicle speed. When it is determined that the vehicle speed exceeds the upper limit vehicle speed, whether the accelerator opening detected by the accelerator opening sensor is less than the predetermined opening. or determines, when the accelerator opening is determined to be less than the predetermined opening, a gear stage of the automatic transmission is shifted down to the low speed side gear stage by controlling the speed-change solenoid valve, the accelerator opening is a predetermined when it is determined that the above opening, a control device for a vehicle, characterized in that to drive the brake device provided on the wheel is shall be braked vehicle (claim 5).

  According to the present invention, as in the first aspect of the present invention, in order to maintain the upper limit vehicle speed, in the vehicle with an ASL function that shifts down the gear stage of the automatic transmission in addition to the limitation of the engine output, A vehicle control device that does not give the driver an excessive feeling of deceleration is provided.

In order to solve the above problems, the present invention sets an engine, an automatic transmission that transmits the rotation of the engine to the wheels while shifting the speed, vehicle speed detection means for detecting the vehicle speed, and an upper limit vehicle speed of the vehicle. When the deviation between the upper limit vehicle speed setting means and the vehicle speed detected by the vehicle speed detection means and the upper limit vehicle speed set by the upper limit vehicle speed setting means is less than a predetermined threshold, the vehicle speed should not exceed the upper limit vehicle speed. An apparatus for controlling a vehicle comprising an engine control means for suppressing engine output, wherein the excess control means determines whether the vehicle speed exceeds an upper limit vehicle speed even if the engine output is suppressed by the engine control means. The accelerator opening determining means for determining whether or not the accelerator opening is less than a predetermined opening when the excess determining means determines that the vehicle speed exceeds the upper limit vehicle speed, and the accelerator opening determining When the accelerator opening is determined to be less than the predetermined opening in stages, and downshift means for downshifting the gear stage of the automatic transmission to the low speed side gear stage, the accelerator opening is a predetermined open in the accelerator operation amount determination unit When it is determined that the vehicle is greater than or equal to the degree , the vehicle control device includes braking means for driving the brake device provided on the wheel to brake the vehicle ( Claim 6 ).

  According to the present invention, as in the first aspect of the present invention, in order to maintain the upper limit vehicle speed, in the vehicle with an ASL function that shifts down the gear stage of the automatic transmission in addition to the limitation of the engine output, A vehicle control device that does not give the driver an excessive feeling of deceleration is provided.

  In order to maintain the upper limit vehicle speed, the present invention can give the driver an excessive feeling of deceleration in a vehicle with an ASL function that shifts down the gear stage of the automatic transmission in addition to limiting the engine output. Therefore, the present invention contributes to the development and improvement of the technology of a vehicle having an ASL function for limiting the vehicle speed so as not to exceed the upper limit vehicle speed.

1 is a vehicle control system diagram according to an embodiment of the present invention. It is explanatory drawing of the ASL function with which the said vehicle was equipped. It is explanatory drawing of the control which changes the threshold value of a vehicle speed restriction | limiting start to a large value, so that required acceleration is large. It is a time chart which shows one example (when accelerator opening is less than predetermined opening) of the operation | movement of the said ASL function. It is a time chart which shows the other example (when an accelerator opening is more than a predetermined opening) of the operation | movement of the said ASL function. It is a flowchart (1st control example) which shows operation | movement of the ASL function which concerns on 1st Embodiment. It is a flowchart (2nd control example) which shows operation | movement of the ASL function which concerns on 2nd Embodiment. It is a flowchart (3rd control example) which shows operation | movement of the ASL function which concerns on 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
(1) Overall Configuration As shown in FIG. 1, a vehicle 1 according to this embodiment includes an engine 2 as a power train and an automatic transmission 3 that transmits rotation of the engine 2 to wheels while shifting the speed. The engine 2 is an internal combustion engine that generates a driving force by combustion of fuel such as gasoline or light oil. The automatic transmission 3 is connected to the engine 2 via a torque converter (not shown), and a plurality of forward gears 1 to 6 and a plurality of reverse gears are achieved by fastening or releasing a plurality of friction elements. In a state where the gear stage is achieved, a torque transmission path is formed in the automatic transmission 3 between the engine 2 side and the drive wheel 4 side.

  The vehicle 1 includes a controller 10 that controls the engine 2 and the automatic transmission 3. The controller 10 is composed of a microprocessor including a CPU, ROM, RAM, and the like. The controller 10 includes a gear stage setting unit 11 that sets the gear stage of the automatic transmission 3.

  The controller 10 includes a vehicle speed detection device that detects the traveling speed (vehicle speed) of the vehicle 1, a vehicle speed sensor 21 as vehicle speed detection means, and an accelerator opening that detects a driver's accelerator operation amount (a depression amount of an accelerator pedal (not shown)). As an accelerator opening sensor 22 as detection means, an ASL switch 23 that enables or disables an ASL (adjustable speed limitation) function (vehicle speed limiting function), an upper limit vehicle speed setting device that sets an upper limit vehicle speed of ASL, and an upper limit vehicle speed setting means The upper limit vehicle speed setting switch 24 is electrically connected to each other.

  The controller 10 executes ASL control (vehicle speed restriction control) based on information input from the sensors 21 and 22 and the switches 23 and 24. That is, when the vehicle speed detected by the vehicle speed sensor 21 approaches the upper limit vehicle speed set in advance by the upper limit vehicle speed setting switch 24, the controller 10 starts limiting the vehicle speed, and is detected by the accelerator opening sensor 22, for example. Even if the accelerator opening is large, the output of the engine 2 is controlled so that the vehicle speed does not exceed the upper limit vehicle speed.

  In order to execute the ASL control, the controller 10 is disposed in an intake passage of the engine 2 (not shown) and adjusts the intake air amount independently of the accelerator opening (throttle by an electric actuator such as a motor). (The valve is driven to open and close) 31, an injector 32 for injecting fuel into the engine 2, an ignition plug 33 for igniting a spark to the air-fuel mixture, and a shift solenoid valve for fastening or releasing a plurality of friction elements of the automatic transmission 3 Are electrically connected to each other and output control signals to them.

  The controller 10 also outputs a control signal to the display device 35. The display device 35 is arranged in the vicinity of the driver's seat, and displays the upper vehicle speed set by the upper vehicle speed setting switch 24 with the ASL switch 23 turned on (ASL function is enabled) or off (ASL function is disabled). indicate.

  The controller 10 also outputs a control signal to the brake device 36. The brake device 36 is provided on the wheel and applies a braking force corresponding to the brake fluid pressure to the vehicle 1 via the wheel. The controller 10 increases or decreases the brake fluid pressure by controlling a piston (not shown).

(2) Control contents Next, the contents of the ASL control executed by the controller 10 will be described.

  [2-1] FIG. 2 conceptually shows a shift map used by the gear setting unit 11 to set the gear based on the vehicle speed and the accelerator opening. In FIG. 2, the transmission line when the gear stage is shifted up is indicated by a solid line. Note that FIG. 2 is merely a conceptual diagram, and it goes without saying that the position and shape of the transmission line with respect to the vehicle speed are not limited to this.

  In FIG. 2, Vo is an ASL upper limit vehicle speed, and Vx is a threshold vehicle speed at which vehicle speed restriction is started. The threshold vehicle speed Vx is a vehicle speed that is lower than the upper limit vehicle speed Vo by a predetermined vehicle speed. A deviation (Vo−Vx) between the upper limit vehicle speed Vo and the threshold vehicle speed Vx corresponds to a “threshold value” in the claims.

  Now, when the stopped vehicle 1 starts, the driving point changes in the order of (i) → (ii) → (iii). That is, the stopped vehicle 1 is at the driving point (i) where the vehicle speed and the accelerator opening are both zero. The vehicle 1 started when the driver depresses the accelerator pedal from here shifts to a driving point (ii) where the accelerator opening is increased. Thereafter, the vehicle 1 whose vehicle speed has increased while the amount of depression of the accelerator pedal is maintained reaches the driving point (iii). That is, the vehicle speed increases to the threshold vehicle speed Vx and approaches the upper limit vehicle speed Vo. When the vehicle speed rises to the threshold vehicle speed Vx, the vehicle speed limit is started. For example, the throttle opening of the electric throttle 31 and the injector 32 are set so that the vehicle speed does not exceed the upper limit vehicle speed Vo even if the driver depresses the accelerator pedal greatly. The fuel injection amount and the ignition timing of the spark plug 33 are adjusted to suppress the output of the engine 2. From the above, in this embodiment, the controller 10 corresponds to the “engine control device” and “engine control means” of the present invention.

  FIG. 2 shows that the gear stage of the automatic transmission 3 is shifted from the first speed to the second speed by the gear stage setting unit 11 during the transition from the driving point (ii) to the driving point (iii), and the vehicle 1 is accelerated at the second speed. The case where the vehicle speed increases to the threshold vehicle speed Vx and the vehicle speed restriction starts is illustrated, but it is needless to say that the present invention is not limited to this.

  [2-2] FIG. 3 is a characteristic diagram showing the relationship between the vehicle speed deviation and the upper limit acceleration.

  The vehicle speed deviation is a value obtained by subtracting the actual vehicle speed detected by the vehicle speed sensor 21 from the upper limit vehicle speed Vo (= upper limit vehicle speed Vo−actual vehicle speed). Before the vehicle speed reaches the upper limit vehicle speed Vo, since the actual vehicle speed is less than the upper limit vehicle speed Vo, the vehicle speed deviation is calculated as a positive value. For example, when the upper limit vehicle speed Vo is 50 km / h, when the vehicle speed is 20 km / h, the vehicle speed deviation is 30 km / h, when the vehicle speed is 30 km / h, the vehicle speed deviation is 20 km / h, and the vehicle speed is When the speed is 40 km / h, the vehicle speed deviation is 10 km / h. When the vehicle speed reaches the upper limit vehicle speed Vo, the vehicle speed deviation becomes zero.

  In FIG. 3, the upper limit acceleration is an upper limit value of acceleration that can be given to the vehicle 1 in order to limit the vehicle speed to the upper limit vehicle speed Vo or less. That is, in each vehicle speed deviation, when the upper limit acceleration is given to the vehicle 1, the vehicle speed of the vehicle 1 becomes the upper limit vehicle speed Vo, and when the acceleration exceeding the upper limit acceleration is given to the vehicle 1, the vehicle speed of the vehicle 1 exceeds the upper limit vehicle speed Vo. When the acceleration less than the upper limit acceleration is applied to the vehicle 1, the vehicle speed of the vehicle 1 becomes less than the upper limit vehicle speed Vo.

  As shown in the figure, the upper limit acceleration is preset to 1: 1 for each vehicle speed deviation. The upper limit acceleration is set to a larger value as the vehicle speed deviation is larger (that is, as the vehicle speed is lower).

  The driver's required acceleration is calculated from the vehicle speed and the accelerator opening. If the accelerator opening is the same, the required acceleration is calculated to be a larger value as the vehicle speed is lower. If the vehicle speed is the same, the required acceleration is calculated to be a larger value as the accelerator opening is larger.

  For example, as shown by the symbol A in FIG. 3, when the accelerator opening is relatively large and the required acceleration is less than the upper limit acceleration at the point P1 where the vehicle speed deviation is 30 km / h, the required acceleration is given to the vehicle 1. However, since the vehicle speed does not exceed the upper limit vehicle speed Vo, the throttle opening corresponding to the accelerator opening, the fuel injection amount corresponding to the throttle opening, and the ignition timing are determined and executed so that the required acceleration is realized. . The gear stage is set by the gear stage setting unit 11 based on the shift map shown in FIG.

  Next, when the required acceleration matches the upper limit acceleration at the point P2 where the vehicle speed deviation is 20 km / h with the increase in the vehicle speed, the vehicle speed remains at the upper limit vehicle speed Vo even if the required acceleration is applied to the vehicle 1. Since the required acceleration is not exceeded, the throttle opening according to the accelerator opening, the fuel injection amount according to the throttle opening, and the ignition timing are determined and executed. The gear stage is set by the gear stage setting unit 11 based on the shift map shown in FIG.

  However, when the required acceleration exceeds the upper limit acceleration at the point P3 where the vehicle speed deviation is smaller than 20 km / h with the increase in the vehicle speed, the vehicle speed becomes the upper limit vehicle speed Vo when the required acceleration is applied to the vehicle 1. Therefore, the accelerator opening is invalidated so that the upper limit acceleration is realized, the throttle opening corresponding to the upper limit acceleration (a value unrelated to the accelerator opening), the fuel injection amount corresponding to the throttle opening, and The ignition timing is determined and executed. That is, ASL control (vehicle speed limit control) is executed. During the execution of the ASL control, the gear stage setting unit 11 does not set the gear stage based on the shift map of FIG. 2, but sets it separately by control as described later (see FIGS. 4 and 5).

  On the other hand, as shown by the symbol B in FIG. 3, when the accelerator opening is relatively small, if the required acceleration is less than the upper limit acceleration at the point P4 where the vehicle speed deviation is 20 km / h, the required acceleration is given to the vehicle 1. However, since the vehicle speed does not exceed the upper limit vehicle speed Vo, the throttle opening corresponding to the accelerator opening, the fuel injection amount corresponding to the throttle opening, and the ignition timing are determined and executed so that the required acceleration is realized. . The gear stage is set by the gear stage setting unit 11 based on the shift map shown in FIG.

  Next, when the required acceleration matches the upper limit acceleration at the point P5 where the vehicle speed deviation is 10 km / h with the increase in the vehicle speed, the vehicle speed does not exceed the upper limit vehicle speed Vo even if the required acceleration is applied to the vehicle 1. Since the required acceleration is not exceeded, the throttle opening according to the accelerator opening, the fuel injection amount according to the throttle opening, and the ignition timing are determined and executed. The gear stage is set by the gear stage setting unit 11 based on the shift map shown in FIG.

  However, when the required acceleration exceeds the upper limit acceleration at the point P6 where the vehicle speed deviation is smaller than 10 km / h with the increase in the vehicle speed, the vehicle speed is set to the upper limit vehicle speed Vo when the required acceleration is applied to the vehicle 1. Therefore, the accelerator opening is invalidated so that the upper limit acceleration is realized, the throttle opening corresponding to the upper limit acceleration (a value unrelated to the accelerator opening), the fuel injection amount corresponding to the throttle opening, and The ignition timing is determined and executed. That is, ASL control (vehicle speed limit control) is executed. During the execution of the ASL control, the gear stage setting unit 11 does not set the gear stage based on the shift map of FIG. 2, but sets it separately by control as described later (see FIGS. 4 and 5).

  From the above, when the accelerator opening and therefore the required acceleration are relatively large, the threshold vehicle speed Vx is (upper limit vehicle speed Vo-20 km / h), and when the accelerator opening and therefore the required acceleration is relatively small, B is The threshold vehicle speed Vx is (upper limit vehicle speed Vo-10 km / h). As described above, the threshold value for starting the vehicle speed limit (deviation between the upper limit vehicle speed Vo and the threshold vehicle speed Vx: Vo−Vx) is changed to a larger value as the accelerator opening, and hence the required acceleration, is increased. The restriction starts.

  [2-3] FIG. 4 is a time chart showing an example of a specific operation of the ASL control executed by the controller 10 (when the accelerator opening is relatively small). This time chart is for when the vehicle 1 is traveling on a downhill road.

  In FIG. 4, the accelerator opening changes at a relatively small value (off in the illustrated example). That is, the driver intends to decelerate, the driver's required acceleration is relatively small, and the amount of depression of the accelerator pedal is also relatively small.

  Until the time t1 when the vehicle speed reaches the threshold vehicle speed Vx, the throttle opening is an original value set in proportion to the accelerator opening, and changes at a relatively small value like the accelerator opening (FIG. Zero in the example). Since the vehicle 1 is traveling on a downhill road, the vehicle speed increases, and the gear stage changes as shown in FIG. 2 (the positional relationship between the shift line, the threshold vehicle speed Vx, and the upper limit vehicle speed Vo is shown in FIG. 2). 5th speed is set based on a different one).

  When the vehicle speed exceeds the threshold vehicle speed Vx, the vehicle speed restriction starts. As a result, the throttle opening is decreased after time t1. However, in this example, since the throttle opening is zero before time t1, the throttle opening is fixed at zero after time t1. Therefore, after the time t1, the output of the engine 2 is reduced due to, for example, a decrease in the fuel injection amount or a retard of the ignition timing.

  Even after time t2 when the vehicle speed reaches the upper limit vehicle speed Vo, the throttle opening is maintained at a constant value (zero in this example) as before time t2, so that the vehicle speed is maintained at the upper limit vehicle speed Vo. Therefore, after the time t2, the output of the engine 2 is further reduced due to, for example, a decrease in the fuel injection amount or a retard of the ignition timing.

  In addition to the above, in this embodiment, the gear stage setting unit 11 shifts down the gear stage of the automatic transmission 3 from the fifth speed to the fourth speed in accordance with the time t2 when the vehicle speed reaches the upper limit vehicle speed Vo. That is, the controller 10 determines whether or not the vehicle speed exceeds the upper limit vehicle speed Vo even if the output of the engine 2 is reduced between the time t1 and the time t2 (more specifically, whether or not the vehicle speed may exceed). ) At a predetermined time between time t1 and time t2 (excess determination step, excess determination means). This determination can be made, for example, from the rate of increase in vehicle speed between time t1 and time t2. As a result, when it is determined that the vehicle speed exceeds the upper limit vehicle speed Vo (more specifically, it may exceed), the controller 10 determines that the accelerator opening is a predetermined opening (a relatively small value close to zero). It is determined whether it is less than (accelerator opening determination step, accelerator opening determination means). As a result, in the example of FIG. 4, since the accelerator opening is determined to be relatively small and less than the predetermined opening, the controller 10 shifts down the gear stage of the automatic transmission 3 to the low speed side gear stage. Yes (shift down process).

  Thus, when the amount of depression of the accelerator pedal by the driver is relatively small, in order to maintain the upper limit vehicle speed Vo, in addition to the engine brake (time t1 to time) due to the output restriction of the engine 2, the shift of the automatic transmission 3 is performed. Since engine braking (from time t2) due to down occurs, a sufficient deceleration feeling can be given to the driver who intends to decelerate. In fact, after time t2, the vehicle speed is maintained at the upper limit vehicle speed Vo. From the above, in this embodiment, the controller 10 corresponds to the “shift down means” of the present invention.

  [2-4] On the other hand, FIG. 5 is a time chart showing another example of the specific operation of the ASL control executed by the controller 10 (when the accelerator opening is relatively large). This time chart is also when the vehicle 1 is traveling on a downhill road.

  In FIG. 5, the accelerator opening changes at a relatively large value (on in the example). That is, the driver does not intend to decelerate, the driver's required acceleration is relatively large, and the amount of depression of the accelerator pedal is also relatively large.

  Until time t1 when the vehicle speed reaches the threshold vehicle speed Vx, the throttle opening is an original value that is set in proportion to the accelerator opening, and changes at a relatively large value, similar to the accelerator opening. Since the vehicle 1 is traveling on a downhill road and the throttle opening is changing at a relatively large value, the vehicle speed increases, and the gear stage is changed to a shift map (shift line and shift line as shown in FIG. 2). The fifth speed is set based on the positional relationship between the threshold vehicle speed Vx and the upper limit vehicle speed Vo different from that shown in FIG.

  When the vehicle speed exceeds the threshold vehicle speed Vx, the vehicle speed restriction starts. As a result, the throttle opening is decreased after time t1. As a result, the intake air amount and the fuel injection amount are reduced, and the output of the engine 2 is reduced. At this time, the ignition timing may be retarded.

  After time t2 when the vehicle speed reaches the upper limit vehicle speed Vo, the throttle opening degree is set so that the vehicle speed is maintained at the upper limit vehicle speed Vo (however, in this example, the vehicle speed exceeds the upper limit vehicle speed Vo without being maintained) It is maintained at a constant value (zero in this example).

  The throttle opening is gradually decreased between time t1 and time t2. This is because as the vehicle speed increases, the upper limit acceleration gradually decreases as the vehicle speed approaches the upper limit vehicle speed Vo, as shown in FIG. When the vehicle speed reaches the upper limit vehicle speed Vo, the upper limit acceleration becomes zero.

  In contrast to the example of FIG. 4, in the example of FIG. 5, the gear stage of the automatic transmission 3 is not shifted down. That is, the controller 10 determines whether or not the vehicle speed exceeds the upper limit vehicle speed Vo even if the output of the engine 2 is reduced between the time t1 and the time t2 (more specifically, whether or not the vehicle speed may exceed). ) At a predetermined time between time t1 and time t2 (excess determination means). This determination can be made, for example, from the rate of increase in vehicle speed between time t1 and time t2. As a result, when it is determined that the vehicle speed exceeds the upper limit vehicle speed Vo (more specifically, it may exceed), the controller 10 determines that the accelerator opening is a predetermined opening (a relatively small value close to zero). It is judged whether it is less than (accelerator opening degree judging means). As a result, in the example of FIG. 5, since the accelerator opening is relatively large and is not determined to be less than the predetermined opening, the controller 10 does not shift down the gear stage of the automatic transmission 3 to the lower gear stage. .

  As a result, when the amount of depression of the accelerator pedal by the driver is relatively large, only engine braking (time t1 to time) due to output restriction of the engine 2 is generated in order to maintain the upper limit vehicle speed Vo. It does not give the driver a feeling of excessive deceleration. However, as a result, the engine brake is insufficient, and the vehicle speed may exceed the upper limit vehicle speed Vo after time t2, as shown in FIG. This countermeasure will be described later with reference to FIG.

  [2-5] Next, a specific operation (first control example) of the ASL control executed by the controller 10 will be described with reference to the flowchart of FIG.

  After reading various signals in step S1, the controller 10 determines in step S2 whether the vehicle speed limiting function (ASL function) is valid. The controller 10 determines YES when the ASL switch 23 is on, and determines NO when the ASL switch 23 is off. When it is determined YES, the controller 10 proceeds to step S3, and when it is determined NO, the controller 10 returns to step S1.

  In step S3, the controller 10 calculates the upper limit acceleration from the vehicle speed deviation. That is, the upper limit acceleration corresponding to the vehicle speed deviation (= upper limit vehicle speed Vo−actual vehicle speed) is obtained from the characteristics shown in FIG.

  Next, in step S4, the controller 10 calculates the driver's required acceleration from the vehicle speed and the accelerator opening.

  Next, in step S5, the controller 10 compares the required acceleration with the upper limit acceleration and determines whether the required acceleration exceeds the upper limit acceleration. As a result, when the answer is NO, that is, when the required acceleration is equal to or lower than the upper limit acceleration (before time t1 in FIGS. 4 and 5), the controller 10 shows the gear position of the automatic transmission 3 as shown in FIG. Set based on a simple shift map. Further, the throttle opening corresponding to the accelerator opening, the fuel injection amount corresponding to the throttle opening, and the ignition timing are determined and executed so that the required acceleration is realized. Then, the process returns to step S1.

  On the other hand, if YES in step S5, that is, if the requested acceleration is greater than the upper limit acceleration (after time t1 in FIGS. 4 and 5), the controller 10 starts limiting the vehicle speed in step S7.

  That is, the controller 10 executes output control of the engine 2 by the electric throttle 31 in step S8. In other words, the accelerator opening is invalidated so that the upper limit acceleration is realized, and the throttle opening (a value unrelated to the accelerator opening) corresponding to the upper limit acceleration, the fuel injection amount corresponding to the throttle opening, and the ignition timing are determined. And run. That is, ASL control is executed (engine control device, engine control means).

  Next, in step S9 (at a predetermined time between time t1 and time t2), the controller 10 determines whether or not the upper limit vehicle speed Vo cannot be maintained only by executing the output control of the engine 2 by the electric throttle 31 (more specifically, (Excess determination means) is determined. As a result, when YES, the process proceeds to step S10, and when NO, the process returns to step S1.

  Next, in Step S10 (at a predetermined time between time t1 and time t2), the controller 10 determines whether or not the accelerator opening is less than a predetermined opening (a relatively small value close to zero) (accelerator opening). Degree determination means). As a result, if YES (when the driver intends to decelerate), the process proceeds to step S11 (example in FIG. 4). If NO (when the driver does not intend to decelerate), step S1 is performed. Return to (example of FIG. 5).

  Next, in step S11, the controller 10 shifts down the gear of the automatic transmission 3 to a lower gear (shift down means). Then, the process returns to step S1.

(3) Operation As described above, in the present embodiment, the controller 10 of the vehicle 1 controls the engine so that the vehicle speed does not exceed the upper limit vehicle speed Vo when the deviation between the vehicle speed and the upper limit vehicle speed Vo is less than a predetermined threshold. Even if the output of 2 is suppressed, it is determined whether or not the vehicle speed exceeds the upper limit vehicle speed Vo. When it is determined that the vehicle speed exceeds the upper limit vehicle speed Vo, the controller 10 determines whether the accelerator opening is less than a predetermined opening. When it is determined that the accelerator opening is less than the predetermined opening, the controller 10 shifts down the gear of the automatic transmission 3 to a low gear.

  According to this configuration, in the vehicle 1 having the ASL function for limiting the vehicle speed so as not to exceed the upper limit vehicle speed Vo, the vehicle speed remains at the upper limit vehicle speed even if the output of the engine 2 is suppressed so that the vehicle speed does not exceed the upper limit vehicle speed Vo. When it is determined that Vo is exceeded, when the accelerator opening is determined to be less than the predetermined opening, the gear stage of the automatic transmission 3 is shifted down to the low-speed gear stage. In other words, when it is determined that the accelerator opening is equal to or greater than the predetermined opening, the gear stage of the automatic transmission 3 is not shifted down to the low speed gear stage.

  Therefore, when the amount of depression of the accelerator pedal of the driver is relatively large, it is determined that the accelerator opening is equal to or greater than the predetermined opening, and only engine braking due to output limitation of the engine 2 is generated in order to maintain the upper limit vehicle speed Vo. The driver who does not intend to decelerate does not give an excessive feeling of deceleration. On the other hand, when the amount of depression of the accelerator pedal by the driver is relatively small, it is determined that the accelerator opening is less than the predetermined opening, and in order to maintain the upper limit vehicle speed Vo, Since engine braking occurs due to the downshift of the transmission 3, a sufficient deceleration feeling can be given to the driver who intends to decelerate.

  As described above, according to the present embodiment, in order to maintain the upper limit vehicle speed Vo, in the vehicle 1 with the ASL function in which the gear stage of the automatic transmission 3 is shifted down in addition to the output restriction of the engine 2, A control method and a control device for the vehicle 1 that do not give the person an excessive feeling of deceleration are provided.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. That is, in the second embodiment, since the flowchart of FIG. 6 in the first embodiment is changed to the flowchart shown in FIG. 7, only this point will be described, and other description will be omitted.

  A specific operation (second control example) of the ASL control executed by the controller 10 will be described with reference to the flowchart of FIG. However, steps S21 to S31 are the same as steps S1 to S11 in FIG. 6 and will be described from step S32.

  That is, in this second control example, when NO in step S30 (when the driver does not intend to decelerate), the controller 10 drives the brake device 36 provided on the wheel in step S32. The vehicle 1 is braked (braking process). That is, when the driver does not intend to decelerate, the automatic transmission 3 is not downshifted, so that the engine brake is insufficient, and the vehicle speed becomes the upper limit vehicle speed Vo after time t2, as shown in FIG. May be exceeded. Therefore, we will take measures against this.

  Next, in step S33, the controller 10 determines whether or not the vehicle speed has fallen below the upper limit vehicle speed Vo. As a result, when the determination is YES (see symbol a in FIG. 5), the controller 10 ends the brake braking in step S34 and returns to step S21. On the other hand, in the case of NO, the controller 50 determines whether or not the vehicle speed exceeds the upper limit vehicle speed Vo by a predetermined vehicle speed or more in step S35 (excess completed determination step). As a result, when the result is NO, the process returns to step S32. When the result is YES, the process proceeds to step 36.

  In step S36, the controller 10 reduces brake braking (braking force reduction process), and in step S37, shifts down the gear stage of the automatic transmission 3 to the low speed side gear stage (post-excess shift down process). Return to step S21.

  According to this second control example, when the driver continues to depress the accelerator pedal (NO in step S30), the brake device 36 is driven as an alternative to engine braking by downshifting of the automatic transmission 3. Therefore (step S32), the braking of the vehicle 1 by the brake device 36 prevents the vehicle speed from exceeding the upper limit vehicle speed Vo, and the upper limit vehicle speed Vo is maintained.

  If it is determined that the vehicle speed exceeds the upper limit vehicle speed Vo by the brake device 36 by the braking device 36 (YES in step S35), the gear position of the automatic transmission 3 is changed to the lower gear position. Shifted down (step S37). Therefore, engine braking due to the downshift of the automatic transmission 3 is generated, and the vehicle speed is suppressed from significantly exceeding the upper limit vehicle speed Vo.

  When engine brake is generated by downshifting the automatic transmission 3, the braking force of the vehicle 1 by the brake device 36 is reduced (step S36). Therefore, the problem that the driver feels excessive deceleration is suppressed by the overlap of the engine brake caused by the downshift of the automatic transmission 3 and the braking force of the vehicle 1 by the brake device 36.

  That is, in this embodiment, the controller 10 of the vehicle 1 drives the brake device 36 to brake the vehicle 1 when it is determined that the accelerator opening is equal to or greater than the predetermined opening.

  According to this configuration, when the amount of depression of the accelerator pedal of the driver is relatively large, the brake device 36 is driven as an alternative to engine braking by downshifting of the automatic transmission 3, and therefore the vehicle 1 by the brake device 36 is driven. Thus, the vehicle speed is suppressed from exceeding the upper limit vehicle speed Vo (that is, the upper limit vehicle speed Vo is maintained).

  In the present embodiment, the controller 10 of the vehicle 1 determines whether or not the vehicle speed exceeds the upper limit vehicle speed Vo by a predetermined vehicle speed or more even when the vehicle 1 is braked by the brake device 36. When it is determined that the vehicle speed exceeds the upper limit vehicle speed Vo by a predetermined vehicle speed or more, the controller 10 shifts down the gear stage of the automatic transmission 3 to a low-speed side gear stage.

  According to this configuration, when it is determined that the vehicle speed exceeds the upper limit vehicle speed Vo by the braking device 36 by braking the vehicle 1, the gear stage of the automatic transmission 3 is shifted down to the lower gear stage. Is done. As a result, engine braking occurs due to the downshift of the automatic transmission 3, so that the vehicle speed is suppressed from significantly exceeding the upper limit vehicle speed Vo.

  In the present embodiment, the controller 10 of the vehicle 1 reduces the braking force of the vehicle 1 by the brake device 36 when the gear stage of the automatic transmission 3 is shifted down.

  According to this configuration, when the engine brake is generated by the downshift of the automatic transmission 3, the braking force of the vehicle 1 by the brake device 36 is reduced. Therefore, the engine brake by the downshift of the automatic transmission 3 and the brake When the braking force of the vehicle 1 by the device 36 overlaps, the problem that the driver feels excessive deceleration is suppressed.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. That is, in the third embodiment, since the flowchart of FIG. 6 in the first embodiment is changed to the flowchart shown in FIG. 8, only this point will be described and the other description will be omitted.

  A specific operation (third control example) of the ASL control executed by the controller 10 will be described with reference to the flowchart of FIG. However, steps S41 to S49 are the same as steps S1 to S9 in FIG. 6 and will be described from step S50.

  That is, in this third control example, when YES is determined in step S49 (when the upper limit vehicle speed Vo cannot be maintained only by executing the output control of the engine 2 by the electric throttle 31), the controller 10 determines whether the accelerator is in step S50. It is determined whether or not there is a change in opening. As a result, if YES, the controller 10 determines in step S51 whether the change in accelerator opening is greater than or equal to a predetermined amount on the decreasing side (accelerator opening decrease determining step). As a result, when the determination is YES (see symbol b in FIG. 5), the controller 10 shifts down the gear stage of the automatic transmission 3 to the low-speed gear stage in step S52. Then, the process returns to step S1.

  According to the third control example, when the driver is not performing an operation intended to decelerate (NO in step S50 or S51), an engine brake by limiting the output of the engine 2 is used to maintain the upper limit vehicle speed Vo. Since only (time t1 to time) occurs, an excessive deceleration feeling is not given to a driver who does not intend to decelerate. On the other hand, when the driver performs an operation intended for deceleration (YES in steps S50 and S51), in order to maintain the upper limit vehicle speed Vo, in addition to engine braking (time t1 to time t1) due to output restriction of the engine 2, Since engine braking (from time t2) due to downshifting of the automatic transmission 3 occurs, a sufficient deceleration feeling can be given to the driver who intends to decelerate.

  That is, in this embodiment, the controller 10 of the vehicle 1 controls the output of the engine 2 so that the vehicle speed does not exceed the upper limit vehicle speed Vo when the deviation between the vehicle speed and the upper limit vehicle speed Vo becomes less than a predetermined threshold. Also, it is determined whether or not the vehicle speed exceeds the upper limit vehicle speed Vo. When it is determined that the vehicle speed exceeds the upper limit vehicle speed Vo, the controller 10 determines whether or not the accelerator opening has changed by a predetermined amount or more to the decreasing side. Then, when the accelerator opening changes to the decreasing side by a predetermined amount or more, the controller 10 shifts down the gear stage of the automatic transmission 3 to the low speed side gear stage.

  According to this configuration, when the accelerator opening changes by a predetermined amount or more to the decrease side, the gear stage of the automatic transmission 3 is shifted down to the gear stage on the low speed side. In other words, when the driver performs an operation intended to decelerate, the gear stage of the automatic transmission 3 is shifted down to a lower gear, and the driver is not performing an operation intended to decelerate. The gear stage of the automatic transmission 3 is not shifted down to the low speed side gear stage.

  Therefore, when the driver is not performing an operation intended to decelerate, only the engine brake due to the output restriction of the engine 2 is generated in order to maintain the upper limit vehicle speed Vo. And does not give an excessive feeling of deceleration. On the other hand, when the driver performs an operation intended to decelerate, in order to maintain the upper limit vehicle speed Vo, in addition to the engine brake due to the output restriction of the engine 2, the engine brake due to the downshift of the automatic transmission 3 occurs. Therefore, a sufficient deceleration feeling can be given to the driver who intends to decelerate.

<Other embodiments>
In the above embodiment, it is determined in step S51 of FIG. 8 whether or not the change in accelerator opening is equal to or greater than a predetermined amount on the decreasing side. Instead, the accelerator opening is predetermined on the decreasing side. You may make it determine whether it changed more than speed | velocity, or whether the accelerator opening changed to the reduction | decrease side more than a predetermined amount above the predetermined speed (accelerator opening decrease determination process).

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 Automatic transmission 4 Drive wheel 10 Controller (Engine control apparatus, engine control means, excess determination means, accelerator opening determination means, shift down means)
11 gear stage setting unit 21 vehicle speed sensor (vehicle speed detection device, vehicle speed detection means)
22 accelerator opening sensor 23 ASL switch 24 upper limit vehicle speed setting switch (upper limit vehicle speed setting device, upper limit vehicle speed setting means)
31 Electric throttle (throttle valve)
32 Injector 33 Spark plug 34 Solenoid valve for shifting 36 Brake device Vx Threshold vehicle speed Vo Upper limit vehicle speed

Claims (6)

Engine,
An automatic transmission that transmits the rotation of the engine to the wheels while shifting,
A vehicle speed detection device for detecting the vehicle speed;
An upper limit vehicle speed setting device for setting an upper limit vehicle speed of the vehicle;
Engine control that suppresses engine output so that the vehicle speed does not exceed the upper limit vehicle speed when the deviation between the vehicle speed detected by the vehicle speed detection device and the upper limit vehicle speed set by the upper limit vehicle speed setting device is less than a predetermined threshold. A method for controlling a vehicle comprising a device,
An excess determination step for determining whether the vehicle speed exceeds the upper limit vehicle speed even when the engine output is suppressed by the engine control device;
An accelerator opening determination step for determining whether or not the accelerator opening is less than a predetermined opening when it is determined that the vehicle speed exceeds the upper limit vehicle speed in the excess determination step;
A shift down step of shifting down the gear position of the automatic transmission to a low speed gear when the accelerator opening is determined to be less than the predetermined opening in the accelerator opening determination step ;
And a braking step of braking the vehicle by driving a brake device provided on the wheel when the accelerator opening is determined to be greater than or equal to a predetermined opening in the accelerator opening determining step. . The vehicle control method according to claim 1 ,
An excess determination step for determining whether the vehicle speed exceeds the upper limit vehicle speed by a predetermined vehicle speed or more even when the vehicle is braked in the braking step;
A shift down step after the excess that shifts down the gear of the automatic transmission to a lower gear when the vehicle speed is determined to exceed the upper limit vehicle speed by a predetermined vehicle speed or more in the excess determination step. Vehicle control method. The vehicle control method according to claim 2 ,
A vehicle control method comprising a braking force reduction step of reducing the braking force of the vehicle in the braking step when the gear stage of the automatic transmission is shifted down in the shift down step after the excess. Engine,
An automatic transmission that transmits the rotation of the engine to the wheels while shifting,
A vehicle speed detection device for detecting the vehicle speed;
An upper limit vehicle speed setting device for setting an upper limit vehicle speed of the vehicle;
Engine control that suppresses engine output so that the vehicle speed does not exceed the upper limit vehicle speed when the deviation between the vehicle speed detected by the vehicle speed detection device and the upper limit vehicle speed set by the upper limit vehicle speed setting device is less than a predetermined threshold. A method for controlling a vehicle comprising a device,
An excess determination step for determining whether the vehicle speed exceeds the upper limit vehicle speed even when the engine output is suppressed by the engine control device;
When it is determined that the vehicle speed exceeds the upper limit vehicle speed in the excess determination step, whether or not the accelerator opening has changed to a decreasing side by a predetermined amount or more, whether or not the accelerator opening has changed to a decreasing side by a predetermined speed or more, Alternatively, an accelerator opening decrease determination step for determining whether or not the accelerator opening has changed to a decreasing side by a predetermined amount or more at a predetermined speed,
A shift-down step of downshifting the gear position of the automatic transmission to a low-speed gear when a change in the accelerator opening to the decrease side is determined in the accelerator opening decrease determination step. Vehicle control method. Engine,
An automatic transmission that transmits the rotation of the engine to the wheels while shifting,
A vehicle speed sensor for detecting the vehicle speed;
An upper limit vehicle speed setting switch for setting the upper limit vehicle speed of the vehicle;
An accelerator opening sensor for detecting the accelerator opening;
A throttle valve that adjusts the intake air amount of the engine independently of the accelerator opening;
An apparatus for controlling a vehicle including a shift solenoid valve that achieves a plurality of gear stages of an automatic transmission,
Controlling at least the throttle valve so that the vehicle speed does not exceed the upper limit vehicle speed when the deviation between the vehicle speed detected by the vehicle speed sensor and the upper limit vehicle speed set by the upper limit vehicle speed setting switch is less than a predetermined threshold. With a controller that suppresses engine output by
The above controller
Even if the engine output is suppressed, it is determined whether the vehicle speed exceeds the upper limit vehicle speed,
When it is determined that the vehicle speed exceeds the upper limit vehicle speed, it is determined whether the accelerator opening detected by the accelerator opening sensor is less than a predetermined opening;
When it is determined that the accelerator opening is less than the predetermined opening, the gear position of the automatic transmission is shifted down to the gear position on the low speed side by controlling the shift solenoid valve .
When the accelerator opening is determined to more than a predetermined opening degree, the control device for a vehicle, characterized in that to drive the brake device provided on the wheel is shall be brake the vehicle. Engine,
An automatic transmission that transmits the rotation of the engine to the wheels while shifting,
Vehicle speed detection means for detecting the vehicle speed;
Upper limit vehicle speed setting means for setting an upper limit vehicle speed of the vehicle;
Engine control that suppresses engine output so that the vehicle speed does not exceed the upper limit vehicle speed when the deviation between the vehicle speed detected by the vehicle speed detection means and the upper limit vehicle speed set by the upper limit vehicle speed setting means is less than a predetermined threshold. An apparatus for controlling a vehicle comprising means,
Excess determination means for determining whether or not the vehicle speed exceeds the upper limit vehicle speed even if the engine output is suppressed by the engine control means;
An accelerator opening determining means for determining whether the accelerator opening is less than a predetermined opening when the excess determining means determines that the vehicle speed exceeds the upper limit vehicle speed;
Downshift means for downshifting the gear stage of the automatic transmission to a low speed gear stage when the accelerator opening degree judging means determines that the accelerator opening degree is less than the predetermined opening degree ;
A vehicle control device comprising: braking means for driving a brake device provided on a wheel to brake the vehicle when the accelerator opening degree is determined to be greater than or equal to a predetermined opening degree by the accelerator opening degree determining means. .

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