JP2011017295A - Vehicular control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular control device for suppressing the unstable combustion state of an internal combustion engine caused by a reflux of exhaust gas in a vehicle which performs damping control to cancel the fluctuation of a vehicular travel speed caused by the inclination of a travel road.SOLUTION: In the vehicle having an exhaust gas reflux device 44 and a travel speed sensor 46 for detecting the vehicular travel speed SPD, an exhaust gas reflux valve 43 is fully closed when performing the damping control to control a throttle opening θ serving as the opening of a throttle valve 34 on the basis of the detection result of the travel speed sensor 46 so as to cancel the fluctuation of the vehicular travel speed SPD caused by the inclination of the travel road.

Description

  The present invention relates to a vehicle control device.

  When the vehicle is traveling, the traveling speed of the vehicle may fluctuate slightly with respect to the desired traveling speed due to the inclination of the traveling road surface. In other words, the traveling speed of the vehicle temporarily decreases when the traveling road surface is an uphill road, while the traveling speed of the vehicle temporarily increases when the traveling road surface is a downhill road.

  Therefore, in recent years, control that controls the output of the internal combustion engine so as to cancel out slight fluctuations in the traveling speed of the vehicle due to the inclination of the traveling road surface, in other words, control that controls the output of the internal combustion engine so as to cancel out the vibration in the vehicle longitudinal direction, so-called vibration suppression control Has been proposed (see, for example, Patent Document 1). In this vibration suppression control, the output of the internal combustion engine is increased when the traveling speed of the vehicle temporarily decreases according to the inclination of the traveling road surface, while the output of the internal combustion engine is temporarily increased according to the inclination of the traveling road surface. The output of the internal combustion engine is reduced. In addition, the control of the output of the internal combustion engine executed in such vibration suppression control is to change the output of the internal combustion engine so as to cancel out slight fluctuations in the traveling speed of the vehicle that changes according to the condition of the traveling road surface. For this reason, the combustion state of the internal combustion engine frequently changes during execution of the vibration suppression control.

JP 59-23037 A

  Incidentally, in general, an internal combustion engine is provided with an exhaust gas recirculation device that recirculates a part of the exhaust gas discharged from the combustion chamber to the combustion chamber through an exhaust gas recirculation passage. By performing exhaust gas recirculation by such an exhaust gas recirculation device, the opening degree of the throttle valve can be increased to reduce the pumping loss, and the fuel consumption can be improved. However, when the exhaust gas is recirculated in this way and the combustion state of the internal combustion engine changes and the exhaust property changes, this change in the exhaust property affects the combustion state with a predetermined response delay. . In particular, the exhaust gas has a greater specific gravity than the intake air, so that such a response delay becomes remarkable.

  For this reason, when the exhaust gas is recirculated during the execution of the vibration suppression control in which the combustion state of the internal combustion engine changes frequently as described above, the output of the internal combustion engine is changed by the influence of the recirculated exhaust gas to the fluctuation of the traveling speed of the vehicle. Therefore, it is difficult to control in detail, and the combustion state becomes unstable, such as fluctuation of the air-fuel ratio and misfire.

  The present invention has been made in view of such circumstances, and an object of the present invention is to recirculate exhaust gas in a vehicle in which vibration suppression control is executed that cancels fluctuations in the vehicle traveling speed caused by the inclination of the traveling road surface. Accordingly, it is an object of the present invention to provide a vehicle control device that can suppress an unstable combustion state of an internal combustion engine.

In the following, means for achieving the above object and its effects are described.
According to a first aspect of the present invention, there is provided an exhaust gas recirculation passage connected to an intake passage and an exhaust passage of an internal combustion engine to recirculate a part of exhaust gas to the intake passage and the exhaust gas recirculation passage. An exhaust gas recirculation device having an exhaust gas recirculation valve that adjusts the cross-sectional area of the flow path and a travel speed detection means that detects the travel speed of the vehicle, and cancels fluctuations in the travel speed of the vehicle caused by the inclination of the travel road surface Thus, in the vehicle control device that executes the vibration suppression control that controls the output of the internal combustion engine based on the detection result of the traveling speed detection means, when the vibration suppression control is executed, the exhaust gas recirculation valve is fully closed. It is a summary.

  According to this configuration, the exhaust gas recirculation to the combustion chamber is stopped during execution of vibration suppression control in which the combustion state of the internal combustion engine changes frequently, so that the exhaust property of the exhaust discharged from the combustion chamber changes. Even when it is done, the influence on the combustion state can be suppressed. Therefore, in a vehicle in which vibration suppression control is executed that cancels fluctuations in the traveling speed of the vehicle caused by the inclination of the traveling road surface, the combustion state of the internal combustion engine is prevented from becoming unstable due to recirculation of exhaust gas. Will be able to.

  For example, according to the invention described in claim 2, when the automatic traveling control for automatically controlling the traveling speed of the vehicle is performed, the traveling speed of the vehicle is controlled more finely by performing the vibration damping control. Can do.

  A third aspect of the present invention is the vehicle control apparatus according to the first or second aspect, wherein the output of the internal combustion engine is controlled by controlling an opening degree of a throttle valve in the vibration suppression control. And

  When damping control is performed by controlling the output of the internal combustion engine by controlling the opening of the throttle valve, the amount of intake air must be precisely controlled in accordance with fluctuations in the running speed of the vehicle at that time become. However, as described above, when exhaust gas having different properties is recirculated due to a response delay as described above, even if the intake air amount is precisely controlled, the output of the internal combustion engine changes in the intake air amount due to the effect of the recirculated exhaust gas. Will not follow. In this regard, according to this configuration, in the vehicle that controls the output of the internal combustion engine through the control of the opening degree of the throttle valve, the exhaust gas recirculation valve is fully closed when the vibration suppression control is executed. Therefore, the influence of such exhaust can be suppressed.

  In addition, the automatic traveling control is configured to automatically control the output of the internal combustion engine so that the traveling speed of the vehicle becomes a constant speed, for example, as in the invention according to claim 4, or according to claim 5, According to the invention, the output of the internal combustion engine is increased when the inter-vehicle distance between the vehicle and the preceding vehicle is larger than a predetermined distance so that the inter-vehicle distance between the vehicle and the preceding vehicle is kept constant. When is smaller than the predetermined distance, it can be embodied with a configuration in which this is automatically controlled so as to decrease the output of the internal combustion engine.

  According to a sixth aspect of the present invention, in the vehicle control device according to any one of the first to fifth aspects, the vehicle control device includes a detection unit that detects an opening degree of the exhaust gas recirculation valve, and executes the vibration suppression control. Accordingly, when the exhaust gas recirculation valve is fully closed, an abnormality occurs in the exhaust gas recirculation device based on the opening degree of the exhaust gas recirculation valve detected by the detection means. The gist of the present invention is to further execute an abnormality diagnosis means for determining whether or not there is an abnormality.

  When the exhaust gas discharged from the combustion chamber is recirculated to the combustion chamber through the intake passage, the opening of the throttle valve becomes larger than when the exhaust gas recirculation is not performed, so that the pumping loss can be reduced. become. During the operation of the internal combustion engine, the exhaust gas recirculation valve is often opened for the purpose of reducing such a pumping loss, and therefore, the chance that the exhaust gas recirculation valve is fully closed is small. ing. For this reason, in order to perform abnormality diagnosis for determining whether or not an abnormality has occurred in the exhaust gas recirculation valve during normal operation, it is necessary to separately set a period during which the exhaust gas recirculation valve is fully closed. In this respect, according to the same configuration, it is possible to execute an abnormality diagnosis of the exhaust gas recirculation valve without separately setting a period during which the exhaust gas recirculation valve is fully closed during normal operation.

  A seventh aspect of the present invention is the vehicle control apparatus according to the sixth aspect of the present invention, comprising: a prohibiting unit that prohibits execution of the vibration suppression control when the abnormality diagnosis unit detects an abnormality of the exhaust gas recirculation device. The gist is to provide.

  According to this configuration, when the vibration suppression control is executed, it is possible to suppress the exhaust gas from being recirculated to the combustion chamber due to the abnormality of the exhaust gas recirculation device and the combustion state from being deteriorated.

The schematic diagram which showed the whole structure about the internal combustion engine and its control apparatus concerning this Embodiment. The flowchart which shows the process sequence about the throttle opening degree control process concerning this Embodiment. The timing chart which shows the time change of the travel amount of the vehicle concerning this Embodiment, and the correction amount of throttle opening.

Hereinafter, an embodiment of a vehicle control device according to the present invention will be described with reference to FIGS.
FIG. 1 shows a schematic configuration of an internal combustion engine provided with an exhaust gas recirculation device 44. A piston 12 is accommodated in the cylinder 11 of the internal combustion engine so as to be able to reciprocate. An intake passage 32 and an exhaust passage 33 communicate with the combustion chamber 16 formed above the piston 12. During operation of the internal combustion engine, intake air that is metered in accordance with the engine operating state and fuel injected from the fuel injection valve 15 are introduced into the combustion chamber 16 to form an air-fuel mixture. This air-fuel mixture is ignited by the spark plug 14 and used for combustion. Exhaust gas generated by this combustion is exhausted through the exhaust passage 33. The crankshaft 13 is rotated by the vertical movement of the piston 12 accompanying such combustion. The communication portion between the combustion chamber 16 and the intake passage 32 and the communication portion between the combustion chamber 16 and the exhaust passage 33 are opened and closed by an intake valve 17 and an exhaust valve 18, respectively. The intake valve 17 and the exhaust valve 18 are respectively provided with variable valve mechanisms 50 and 51 for changing their drive modes. The intake valve 17 and the exhaust valve 18 are changed in driving manner by a variable lift mechanism 50, 51 with a predetermined lift profile.

  The intake passage 32 is provided with a throttle valve 34 that is driven to open and close by a motor 34a. By controlling the opening of the throttle valve 34 (hereinafter referred to as the throttle opening θ), the combustion chamber 16 is controlled. The amount of intake air introduced into is adjusted. The output of the internal combustion engine is controlled through control of the intake air amount, in other words, the throttle opening θ.

  Further, the internal combustion engine is provided with an exhaust gas recirculation device 44 for performing exhaust gas recirculation by recirculating exhaust gas from the exhaust passage 33 to the intake passage 32. That is, the exhaust gas recirculation passage 42 branched from the exhaust passage 33 is connected to the downstream side of the throttle valve 34 in the intake passage 32. An exhaust gas recirculation valve 43 is disposed in the middle of the exhaust gas recirculation passage 42, and the flow rate of the exhaust gas recirculating through the exhaust gas recirculation passage 42 is adjusted according to the opening degree of the exhaust gas recirculation valve 43. As described above, in the internal combustion engine in which the throttle valve 34 is provided in the intake passage 32, when the exhaust gas recirculation is executed, the throttle opening degree θ can be increased compared with the non-execution time to reduce the pumping loss. It becomes like this. As a result, fuel consumption can be improved.

  The fuel injection valve 15, the exhaust gas recirculation valve 43, and the motor 34 a are electrically connected to the electronic control device 92, and the drive timing and the like are controlled by the operation of the electronic control device 92. The electronic control unit 92 is connected with various sensors such as a travel speed sensor 46 for detecting the travel speed SPD of the vehicle and an exhaust recirculation valve lift amount sensor 45 for detecting the lift amount of the exhaust recirculation valve 43. The electronic control device 92 is connected to a warning lamp 48 for notifying the abnormality of the exhaust gas recirculation device 44.

  The electronic control device 92 performs various controls of the internal combustion engine based on detection signals from these various sensors. Such various controls include ignition timing control for controlling the ignition timing of the air-fuel mixture by the spark plug 14, fuel injection control for controlling the amount and timing of fuel supplied from the fuel injection valve 15, and throttle for controlling the throttle opening θ. There are opening degree control, variable valve mechanism control for controlling the lift amount of the intake valve 17 and the exhaust valve 18 by the variable valve mechanisms 50 and 51, and the like.

  The electronic control device 92 is connected to a cruise control switch 47 that is a switch for executing cruise control for automatically controlling the output of the internal combustion engine so that the vehicle traveling speed SPD is constant. Yes. In the present embodiment, when the cruise control switch 47 is operated to “ON” by the driver's selection and the cruise control is executed, the vibration damping control is executed and the exhaust gas recirculation valve 43 is fully closed. State. The series of processes will be described below with reference to FIGS.

  As shown in FIG. 2, when this process is started, it is first determined whether or not the cruise control switch 47 is operated "ON" (step S101). When the cruise control switch 47 is not operated “ON” (step S101: NO), this process is temporarily ended.

  On the other hand, when the cruise control switch 47 is operated “ON” (step S101: YES), the target travel speed is set, and the throttle opening is set so that the travel speed SPD of the vehicle coincides with the target travel speed. Cruise control in which θ is controlled is executed (step S102).

  Specifically, first, the traveling speed SPD of the vehicle is detected by the traveling speed sensor 46. In actual vehicle traveling, the traveling speed SPD of the vehicle temporarily increases or decreases due to the inclination of the traveling road surface as shown by the solid line in FIG. Therefore, a filtering process such as a weighted average process is performed on the detected vehicle travel speed SPD to calculate an average travel speed SPD1 of the vehicle travel speed SPD. The average traveling speed SPD1 is a traveling speed excluding a slight fluctuation in the traveling speed SPD of the vehicle, and is a value obtained by filtering the traveling speed SPD of the vehicle with a low-pass filter. The average traveling speed SPD1 calculated in this way is indicated by a one-dot chain line in FIG.

  As described below, the throttle opening θ is controlled so that the average traveling speed SPD1 matches the target traveling speed. That is, first, a deviation ΔSPD1 between the average travel speed SPD1 and the target travel speed is calculated. Next, the target throttle opening degree θ is calculated as F (ΔSPD1) according to the deviation ΔSPD1. Note that “F (ΔSPD1)” indicates a function having a deviation ΔSPD1 between the average travel speed SPD1 and the target travel speed as an argument.

  This F (ΔSPD1) is set so as to increase as the average traveling speed SPD1 decreases when the average traveling speed SPD1 is smaller than the target traveling speed, for example, at the timing T1 in FIG. That is, F (ΔSPD1) is set so that the output of the internal combustion engine increases as the average travel speed SPD1 is smaller than the target travel speed. On the other hand, when the average travel speed SPD1 is higher than the target travel speed, the average travel speed SPD1 is set so as to decrease as the average travel speed SPD1 increases. That is, at this time, F (ΔSPD1) is set so that the output of the internal combustion engine becomes smaller as the average travel speed SPD1 is larger than the target travel speed. Thus, according to ΔSPD1, the throttle opening θ, that is, the output of the internal combustion engine is controlled so that the average traveling speed SPD1 matches the target traveling speed.

  Next, the exhaust gas recirculation valve 43 is fully closed (step S103). The lift amount of the exhaust gas recirculation valve 43 is detected by the exhaust gas recirculation valve lift amount sensor 45 connected to the exhaust gas recirculation valve 43 (step S104).

  Then, it is determined whether or not the lift amount of the exhaust gas recirculation valve 43 is “0” (step S105). When the lift amount of the exhaust gas recirculation valve 43 is not “0” (step S105: NO), it is determined that an abnormality has occurred in the exhaust gas recirculation valve 43, and a warning is given that an abnormality has occurred in the exhaust gas recirculation valve 43. The driver is notified by turning on the lamp 48 (step S106).

  On the other hand, when the lift amount of the exhaust gas recirculation valve 43 is “0” (step S105: YES), control for correcting F (ΔSPD1) so as to cancel the vibration in the longitudinal direction of the vehicle, that is, vibration control is executed. (Step S107).

  Specifically, first, as shown in FIG. 3A, the vehicle travel speed fluctuation amount ΔSPD2, which is a value obtained by subtracting the average travel speed SPD1 from the actual travel speed SPD, is calculated. The transition of the travel speed fluctuation amount ΔSPD2 of the vehicle is shown in FIG. Next, a throttle opening correction amount G (ΔSPD2) is set based on the travel speed fluctuation amount ΔSPD2 of the vehicle. Note that “G (ΔSPD2)” indicates a function having the travel speed fluctuation amount ΔSPD2 as an argument.

  This throttle opening correction amount G (ΔSPD2) is, as shown by a solid line in FIG. 3C, when the vehicle travel speed fluctuation amount ΔSPD2 is a positive value, that is, when the vehicle travel speed SPD is temporarily set. When it rises, it is set to a negative value so as to decrease F (ΔSPD1). Further, the vehicle travel speed fluctuation amount ΔSPD2 is set so as to decrease as the vehicle travel speed variation ΔSPD2 increases (for example, timing T1). On the other hand, when the travel speed fluctuation amount ΔSPD2 of the vehicle is a negative value, that is, when the travel speed SPD of the vehicle temporarily decreases, the throttle opening correction amount G (ΔSPD2) increases F (ΔSPD1). Is set to a positive value. Furthermore, it is set so as to increase as the travel speed fluctuation amount ΔSPD2 of the vehicle increases (for example, at timing T2). Thus, the throttle opening correction amount G (ΔSPD2) is set so that the vehicle traveling speed SPD approaches the average traveling speed SPD1 in accordance with the vehicle traveling speed fluctuation amount ΔSPD2.

  By the way, when the vibration damping control is executed by controlling the throttle opening θ in this way, the intake air amount is precisely controlled according to the fluctuation of the vehicle traveling speed SPD at that time. However, until the result of the control of the throttle opening θ is reflected in the amount of intake air actually flowing into the combustion chamber 16, there is a slight response due to the intake air travel time from the throttle valve 34 to the combustion chamber 16. There is a delay. When such a response delay of the intake air amount exists, the actual output of the internal combustion engine changes slightly behind the originally required amount even if the correction based on the traveling speed SPD of the vehicle is performed as it is. Therefore, in the present embodiment, the throttle opening correction amount G (ΔSPD2) is corrected in consideration of the response delay time T. That is, as indicated by a one-dot chain line in FIG. 3 (c), the throttle opening correction amount G () so that the response delay time T changes so as to compensate for the time corresponding to the response delay of the intake air amount. ΔSPD2) is corrected, and this is calculated as G (ΔSPD2, response delay time T).

Then, the throttle opening θ is calculated by correcting F (ΔSPD1) by G (ΔSPD2, response delay time T) as in the following equation (1).

θ = F (ΔSPD1) + G (ΔSPD2, response delay time T) (1)

By executing such processing, it is possible to suppress slight fluctuations in the traveling speed SPD of the vehicle due to the inclination of the traveling road surface when cruise control is performed.

Further, when the lift amount of the exhaust gas recirculation valve 43 is not “0” (step S105: NO), such vibration suppression control is not executed (step S108), and this process ends.
When the vibration suppression control is executed, the intake air amount is precisely controlled according to the change in the traveling speed SPD of the vehicle at that time. For this reason, when the vibration suppression control is executed when there is a possibility that the exhaust gas may be recirculated to the combustion chamber 16 even though the exhaust gas recirculation valve 43 is fully closed due to the abnormality of the exhaust gas recirculation valve 43. The exhaust gas having different properties is recirculated each time due to a response delay, and the combustion state may become unstable. Therefore, when an abnormality occurs in the exhaust gas recirculation valve 43, the vibration suppression control is not executed to suppress such instability of the combustion state.

According to this embodiment described above, the following effects can be obtained.
(1) According to the present embodiment, the exhaust gas recirculation to the combustion chamber 16 is stopped during the execution of the vibration damping control in which the combustion state of the internal combustion engine frequently changes. Further, the exhaust gas can be prevented from affecting the combustion state. Therefore, in a vehicle in which a cruise control that automatically controls the travel speed SPD of the vehicle and a vibration suppression control that cancels fluctuations in the travel speed SPD of the vehicle are executed, the combustion of the internal combustion engine is caused by the execution of exhaust gas recirculation. It becomes possible to suppress the state from becoming unstable.

  (2) When the vibration suppression control is executed by controlling the throttle opening θ, the intake air amount is precisely controlled according to the fluctuation of the vehicle traveling speed SPD at that time. By the way, when the exhaust gas recirculates and the combustion state of the internal combustion engine changes and the exhaust gas property changes, the change in the exhaust gas property affects the combustion state with a predetermined response delay. If exhaust gas having different properties is recirculated each time due to such a response delay, the output of the internal combustion engine changes to the intake air amount due to the influence of the recirculated exhaust gas even if the intake air amount is precisely controlled. It will not follow. In this regard, according to the present embodiment, in the vehicle that controls the output of the internal combustion engine through the control of the throttle opening θ, the exhaust gas recirculation valve 43 is made to be fully closed when the vibration suppression control is executed. Therefore, the influence of such exhaust can be suppressed.

  (3) When the exhaust gas discharged from the combustion chamber 16 is recirculated to the combustion chamber 16 through the intake passage 32, the throttle opening θ becomes larger than when exhaust gas recirculation is not performed, thereby reducing the pumping loss. To be able to. In many cases, when the internal combustion engine is operated, the exhaust gas recirculation valve 43 is opened for the purpose of reducing such a pumping loss. Therefore, the exhaust gas recirculation valve 43 is rarely fully closed. It has become. For this reason, in order to perform an abnormality diagnosis for determining whether or not an abnormality has occurred in the exhaust gas recirculation valve 43 during normal operation, it is necessary to separately set a period during which the exhaust gas recirculation valve 43 is fully closed. In this regard, according to the present embodiment, the abnormality diagnosis of the exhaust gas recirculation valve 43 can be performed without separately setting a period during which the exhaust gas recirculation valve 43 is fully closed during normal operation.

  (4) According to the present embodiment, when the abnormality of the exhaust gas recirculation valve 43 is detected, the vibration suppression control is not executed. Therefore, the exhaust gas is recirculated to the combustion chamber 16 due to the abnormality of the exhaust gas recirculation valve 43. It becomes possible to suppress the deterioration of the combustion state.

In addition, embodiment described above can be implemented in the aspect which changed the form suitably as follows.
In the above embodiment, the vibration suppression control is executed when the cruise control (constant speed running control) is executed, but the present invention is not limited to this. For example, the vibration suppression control is executed on the condition that the preceding vehicle inter-vehicle control that automatically controls the output of the internal combustion engine is executed so that the inter-vehicle distance between the host vehicle and the preceding vehicle is maintained at a constant predetermined distance. You may make it do. When the preceding vehicle inter-vehicle control is executed, F (ΔSPD1) is set to be large when the inter-vehicle distance between the own vehicle and the preceding vehicle is greater than a predetermined distance, while the inter-vehicle distance between the own vehicle and the preceding vehicle is When the distance is smaller than the predetermined distance, F (ΔSPD1) is set to be small. Also in the present embodiment, it is possible to achieve operational effects according to the operational effects described above.

  In the above embodiment, the output of the internal combustion engine is controlled by controlling the throttle opening θ, but the present invention is not limited to this. For example, the fuel injection amount may be increased when the output of the internal combustion engine needs to be increased, while the fuel injection amount may be decreased when the output of the internal combustion engine is decreased. Also in the present embodiment, it is possible to achieve the effects according to the above (1), (3) and (4). Further, the output of the internal combustion engine may be controlled by controlling the intake air amount through changing the maximum lift amount of the variable valve mechanisms 50 and 51. Also in the present embodiment, it is possible to achieve the effects according to the above (1), (3) and (4). The output of the internal combustion engine can also be controlled by controlling the ignition timing of the air-fuel mixture by the spark plug 14. Also in the present embodiment, it is possible to achieve the effects according to the above (1), (3) and (4).

  In the above embodiment, the vibration suppression control is executed when the constant speed traveling control or the preceding vehicle distance control is performed. However, the present invention is not limited to this, and is based on the driver's request. Thus, the vibration suppression control may be executed when the vehicle traveling speed SPD is controlled. Also in the present embodiment, the effects according to the above (2) to (4) can be achieved.

  In the above embodiment, the abnormality of the exhaust gas recirculation valve 43 is diagnosed when the vibration suppression control is executed in conjunction with the execution of the cruise control, but the present invention is not limited to this. For example, in order to diagnose an abnormality in the exhaust gas recirculation valve 43, a period for forcibly closing the exhaust gas recirculation valve 43 may be set separately. Also in the present embodiment, it is possible to achieve the effect according to the above (4).

  DESCRIPTION OF SYMBOLS 11 ... Cylinder, 12 ... Piston, 13 ... Crankshaft, 14 ... Spark plug, 15 ... Combustion injection valve, 16 ... Combustion chamber, 17 ... Intake valve, 18 ... Exhaust valve, 32 ... Intake passage, 33 ... Exhaust passage, 34 ... Throttle valve, 34a ... Motor, 42 ... Exhaust recirculation passage, 43 ... Exhaust recirculation valve, 44 ... Exhaust recirculation device, 45 ... Exhaust recirculation valve lift amount sensor (diagnosis means), 46 ... Running speed sensor (running speed detection means) , 47 ... Cruise control switch, 48 ... Warning light, 50 ... Variable valve mechanism, 51 ... Variable valve mechanism, 92 ... Electronic control device (running speed detection means, diagnosis means, prohibition means).

Claims (7)

An exhaust gas recirculation passage connected to an intake air passage and an exhaust air passage of an internal combustion engine to recirculate a part of exhaust gas to the intake air passage, and an exhaust gas recirculation provided in the exhaust gas recirculation passage to adjust a cross-sectional area of the exhaust gas recirculation passage An exhaust gas recirculation device having a valve and a travel speed detecting means for detecting the travel speed of the vehicle, and the detection of the travel speed detecting means so as to cancel the fluctuation of the travel speed of the vehicle caused by the inclination of the travel road surface In a vehicle control apparatus that executes vibration suppression control for controlling the output of an internal combustion engine based on a result,
When the vibration suppression control is executed, the exhaust gas recirculation valve is fully closed. The vehicle control device according to claim 1,
The vibration damping control is performed when automatic traveling control for automatically controlling the traveling speed of the vehicle is executed. The vehicle control device according to claim 1 or 2,
In the vibration suppression control, the output of the internal combustion engine is controlled by controlling the opening of the throttle valve. The vehicle control device according to claim 2 or 3,
In the automatic traveling control, the output of the internal combustion engine is automatically controlled so that the traveling speed of the vehicle becomes a constant speed. The vehicle control device according to claim 2 or 3,
In the automatic traveling control, the output of the internal combustion engine is increased when the inter-vehicle distance between the vehicle and the preceding vehicle is larger than a predetermined distance so that the inter-vehicle distance between the vehicle and the preceding vehicle is kept constant. When the distance is smaller than the predetermined distance, this is automatically controlled so as to decrease the output of the internal combustion engine. In the vehicle control device according to any one of claims 1 to 5,
Detecting means for detecting an opening degree of the exhaust gas recirculation valve, and opening the exhaust gas recirculation valve detected by the detection means when the exhaust gas recirculation valve is fully closed as the vibration suppression control is executed. A vehicle control device further comprising: an abnormality diagnosing unit that determines whether or not the exhaust gas recirculation device has an abnormality that does not cause the exhaust gas recirculation valve to be fully closed based on the degree. The vehicle control device according to claim 6,
A vehicle control apparatus comprising: prohibiting means for prohibiting execution of the vibration suppression control when an abnormality of the exhaust gas recirculation apparatus is detected by the abnormality diagnosis means.

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