Vehicle control device

Abstract

To promptly increase a rotation speed of a crank shaft when restarting an internal combustion engine.SOLUTION: A vehicle control device performs: suspension processing which suspends combustion of fuel in a cylinder of an internal combustion engine when a predetermined suspension condition is met and controls a throttle valve of the internal combustion engine to be in a closed state; restart processing to resume the combustion of the fuel in the cylinder when a request is made for restarting the internal combustion engine after the suspension processing; and increase processing which makes an opening of the throttle valve under the restart processing in a case where downstream pressure, intake pressure at a downstream side of the throttle valve when the request is made for restarting, is equal to or less than predetermined pressure larger than the opening in a case where the downstream pressure is higher than the predetermined pressure. In the increase processing, the opening of the throttle valve is increased as a rotation speed of a rotation shaft of a motor generator is increased when the request is made for restarting with the downstream pressure equal to or less than the predetermined pressure.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle control device. [Background technology]

[0002] The vehicle of Patent Document 1 includes an internal combustion engine. The internal combustion engine includes a cylinder, an intake passage, and a throttle valve. The cylinder is a space for burning fuel. The intake passage introduces intake air into the cylinder. The throttle valve is located midway through the intake passage. The throttle valve adjusts the amount of intake air flowing through the intake passage.

[0003] The vehicle in Patent Document 1 is equipped with a control device for an internal combustion engine. When a predetermined stop condition is satisfied, the control device stops the combustion of fuel in the cylinders of the internal combustion engine and controls the throttle valve of the internal combustion engine to a closed state. Furthermore, when a request is made to restart the internal combustion engine, the control device executes the following process. Specifically, the control device acquires the downstream pressure, which is the pressure of the intake air downstream from the throttle valve, at the time when the request is made to restart. Then, the control device determines whether the acquired downstream pressure is equal to or lower than a predetermined specified pressure. If the downstream pressure is equal to or lower than the predetermined specified pressure, the control device increases the opening of the throttle valve when restarting the internal combustion engine. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-327365 A Summary of the Invention [Problem to be solved by the invention]

[0005] A vehicle having a configuration including a motor generator, a clutch, and drive wheels in addition to an internal combustion engine is known. The clutch switches the connection state between the crankshaft of the internal combustion engine and the rotating shaft of the motor generator. The drive wheels are connected to the crankshaft of the internal combustion engine via the rotating shaft of the motor generator and the clutch. In such a vehicle, when restarting the internal combustion engine, the clutch is switched from a released state to an engaged state to transmit the driving force of the restarted internal combustion engine to the drive wheels. At this time, in order to complete the switching of the clutch from a released state to an engaged state, it is necessary to match the rotation speed of the crankshaft of the internal combustion engine with the rotation speed of the rotating shaft of the motor generator. Therefore, the higher the rotation speed of the rotating shaft of the motor generator when restarting the internal combustion engine, the more quickly it is required to increase the rotation speed of the crankshaft of the internal combustion engine. Although the control device of Patent Document 1 performs control according to the downstream pressure when restarting the internal combustion engine, it does not take into account the rotation speed of the rotating shaft of the motor generator. Therefore, the technology disclosed in Patent Document 1 does not necessarily allow the internal combustion engine to be restarted suitably. [Means for solving the problem]

[0006] A vehicle control device for solving the above problems is a vehicle control device that is applied to a vehicle including an internal combustion engine having a crankshaft, a motor generator having a rotating shaft, a clutch interposed between the crankshaft and the rotating shaft and switchable between an engaged state and a released state, and drive wheels connected to the crankshaft via the rotating shaft and the clutch, and includes a stop process that interrupts combustion of fuel in cylinders of the internal combustion engine and controls a throttle valve of the internal combustion engine to a closed state when a predetermined stop condition is satisfied, and a restart of the internal combustion engine after the stop process. a restart process for resuming combustion of fuel in the cylinder when a request for restart is made; and an increase process for increasing the opening of the throttle valve during the restart process when a downstream pressure, which is the pressure of the intake air at the time the restart is made and which is the pressure of the intake air downstream as viewed from the throttle valve, is equal to or lower than a predetermined specified pressure, compared to when the downstream pressure is higher than the specified pressure. In the increase process, when the downstream pressure is equal to or lower than the specified pressure, the higher the rotational speed of the rotating shaft when the restart is made, the larger the opening of the throttle valve is.

[0007] According to the above configuration, when the downstream pressure is equal to or lower than a specified pressure, the higher the rotation speed of the rotary shaft of the motor generator, the larger the opening of the throttle valve. Therefore, even if the downstream pressure is low due to the stop process, the downstream pressure during the restart process quickly increases. This increases the amount of intake air introduced into the cylinder from the intake passage. As a result, a large amount of fuel can be burned in the cylinder, and the rotation speed of the crankshaft of the internal combustion engine can be quickly increased. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic configuration diagram of a vehicle. [Diagram 2] 1 is a schematic diagram of an internal combustion engine. [Diagram 3] 5 is a flowchart showing throttle valve opening control at the time of restarting. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Vehicle mechanical configuration> An embodiment of the present invention will now be described with reference to Figures 1 to 3. First, the mechanical configuration of a vehicle 100 will be described.

[0010] As shown in Fig. 1, a vehicle 100 includes an internal combustion engine 10. As shown in Fig. 2, the internal combustion engine 10 includes a plurality of cylinders 11, an intake passage 12, an exhaust passage 13, a plurality of pistons 16, a plurality of connecting rods 17, and a crankshaft 18.

[0011] As shown in FIG. 2, the cylinder 11 is a space for burning a mixture of fuel and intake air. In this embodiment, the internal combustion engine 10 includes six cylinders 11. The internal combustion engine 10 is a so-called in-line six-cylinder engine in which the six cylinders 11 are arranged in a row. In the following, when the six cylinders 11 are collectively described, they are simply referred to as cylinders 11. When the six cylinders 11 are individually described, they are referred to as the first cylinder 11A, the second cylinder 11B, the third cylinder 11C, the fourth cylinder 11D, the fifth cylinder 11E, and the sixth cylinder 11F from the end in the order in which the six cylinders 11 are arranged. In FIG. 2, only one cylinder 11 is shown as a representative.

[0012] The piston 16 is located inside the cylinder 11. The piston 16 is connected to a crankshaft 18 via a connecting rod 17. The piston 16 reciprocates inside the cylinder 11 as a mixture of fuel and intake air is burned in the cylinder 11. The reciprocating motion of the piston 16 causes the crankshaft 18 to rotate.

[0013] The intake passage 12 is connected to the cylinders 11. The intake passage 12 introduces intake air from outside the internal combustion engine 10 to each cylinder 11. The exhaust passage 13 is connected to the cylinders 11. The exhaust passage 13 discharges exhaust gas from each cylinder 11 to outside the internal combustion engine 10.

[0014] The internal combustion engine 10 includes a throttle valve 21 , a plurality of port injection valves 22 , a plurality of in-cylinder injection valves 23 , a plurality of ignition devices 24 , a plurality of intake valves 26 , and a plurality of exhaust valves 27 .

[0015] The throttle valve 21 is located in the intake passage 12. The throttle valve 21 adjusts the amount of intake air flowing through the intake passage 12. The port injection valve 22 is located in the intake passage 12 near the cylinder 11. The port injection valve 22 injects fuel into the intake passage 12 to supply fuel into the cylinder 11 via the intake passage 12. The internal combustion engine 10 is provided with six port injection valves 22 corresponding to the six cylinders 11. A portion including a tip of the in-cylinder injection valve 23 is located inside the cylinder 11. The in-cylinder injection valve 23 injects fuel into the cylinder 11 to supply fuel into the cylinder 11. The internal combustion engine 10 is provided with six in-cylinder injection valves 23 corresponding to the six cylinders 11.

[0016] A part of the ignition device 24 including a tip is located inside the cylinder 11. The ignition device 24 ignites a mixture of fuel and intake air by spark discharge. The internal combustion engine 10 has six ignition devices 24 corresponding to the six cylinders 11. The six ignition devices 24 ignite the first cylinder 11A, the fifth cylinder 11E, the third cylinder 11C, the sixth cylinder 11F, the second cylinder 11B, and the fourth cylinder 11D in this order. In other words, the internal combustion engine 10 goes through a combustion stroke in the order of the first cylinder 11A, the fifth cylinder 11E, the third cylinder 11C, the sixth cylinder 11F, the second cylinder 11B, and the fourth cylinder 11D. Each cylinder 11 repeats an intake stroke, a compression stroke, a combustion stroke, and an exhaust stroke every time the crankshaft 18 rotates twice.

[0017] The intake valve 26 is located at the downstream end of the intake passage 12. The intake valve 26 opens and closes the downstream end of the intake passage 12 by a driving force from a valve mechanism (not shown). The internal combustion engine 10 is provided with six intake valves 26 corresponding to the six cylinders 11. The exhaust valve 27 is located at the upstream end of the exhaust passage 13. The exhaust valve 27 opens and closes the upstream end of the exhaust passage 13 by a driving force from a valve mechanism (not shown). The internal combustion engine 10 is provided with six exhaust valves 27 corresponding to the six cylinders 11.

[0018] As shown in FIG. 1, the vehicle 100 includes a clutch 31, a motor generator 40, an automatic transmission 61, a differential mechanism 62, and a plurality of drive wheels 63. The motor generator 40 includes a rotating shaft 41, a rotor 42, and a stator 43. The rotating shaft 41 is connected to the rotor 42. Therefore, the rotating shaft 41 is rotatable relative to the stator 43. The rotating shaft 41 of the motor generator 40 is connected to the crankshaft 18 of the internal combustion engine 10 via the clutch 31. That is, the clutch 31 is interposed between the rotating shaft 41 of the motor generator 40 and the crankshaft 18 of the internal combustion engine 10. The connection state of the clutch 31 is switched between an engaged state and a released state according to the pressure of oil supplied to the inside of the clutch 31. Here, the engaged state includes a half-engaged state and a fully-engaged state. The half-engaged state is an engaged state in which the rotating shaft 41 of the motor generator 40 and the crankshaft 18 of the internal combustion engine 10 are connected to each other via the clutch 31, while allowing a difference in rotational speed to occur between the rotating shaft 41 and the crankshaft 18. The fully engaged state is an engaged state in which the rotating shaft 41 of the motor generator 40 and the crankshaft 18 of the internal combustion engine 10 are connected via the clutch 31, and the rotating shaft 41 and the crankshaft 18 rotate integrally.

[0019] Further, the rotating shaft 41 of the motor generator 40 is connected to drive wheels 63 via an automatic transmission 61 and a differential mechanism 62. Therefore, the drive wheels 63 are connected to the crankshaft 18 of the internal combustion engine 10 via the rotating shaft 41 of the motor generator 40 and the clutch 31. An example of the automatic transmission 61 is a stepped automatic transmission. The automatic transmission 61 can change the gear ratio in stages. The differential mechanism 62 allows a difference in rotation speed to occur between the left and right drive wheels 63.

[0020] <Vehicle Electrical Configuration> 1, the vehicle 100 includes a battery 71 and an inverter 72. When the motor generator 40 functions as a power generator, the battery 71 stores the electric power generated by the motor generator 40. When the motor generator 40 functions as an electric motor, the battery 71 supplies electric power to the motor generator 40. The inverter 72 adjusts the amount of electric power exchanged between the motor generator 40 and the battery 71.

[0021] 1, vehicle 100 is equipped with an accelerator operation amount sensor 81, a vehicle speed sensor 82, a crank angle sensor 83, and a rotation angle sensor 84. The accelerator operation amount sensor 81 detects an accelerator operation amount ACC, which is the amount of operation of an accelerator pedal (not shown) operated by a driver. The vehicle speed sensor 82 detects a vehicle speed SP, which is the speed of vehicle 100. The crank angle sensor 83 detects a crank angle SC, which is the angular position of crankshaft 18 of internal combustion engine 10. The rotation angle sensor 84 detects a rotation angle SM, which is the angular position of rotating shaft 41 of motor generator 40.

[0022] As shown in FIG. 1, the vehicle 100 includes a control device 90. The control device 90 obtains a signal indicating an accelerator operation amount ACC from an accelerator operation amount sensor 81. The control device 90 obtains a signal indicating a vehicle speed SP from a vehicle speed sensor 82. The control device 90 obtains a signal indicating a crank angle SC from a crank angle sensor 83. The control device 90 calculates an engine rotation speed NE, which is the rotation speed of the crankshaft 18, based on the crank angle SC. The control device 90 obtains a signal indicating a rotation angle SM from a rotation angle sensor 84. The control device 90 calculates a motor rotation speed NM, which is the rotation speed of the rotating shaft 41, based on the rotation angle SM.

[0023] The control device 90 calculates the vehicle required driving force, which is a required value of driving force necessary for the vehicle 100 to travel, based on the accelerator operation amount ACC and the vehicle speed SP. The control device 90 determines the torque distribution between the internal combustion engine 10 and the motor generator 40 based on the vehicle required driving force. The control device 90 controls the output of the internal combustion engine 10 and the power running and regeneration of the motor generator 40 based on the torque distribution between the internal combustion engine 10 and the motor generator 40.

[0024] The control device 90 performs various types of control such as adjusting the opening of the throttle valve 21, adjusting the amount of fuel injected from the port injection valve 22, adjusting the amount of fuel injected from the in-cylinder injection valve 23, and adjusting the ignition timing of the ignition device 24 by outputting control signals to the internal combustion engine 10. The control device 90 also outputs a control signal to the inverter 72 in order to control the motor generator 40. The control device 90 then controls the motor generator 40 by adjusting the amount of power exchanged between the motor generator 40 and the battery 71 via the inverter 72.

[0025] The control device 90 outputs a control signal to the clutch 31 to control the connection state of the clutch 31. The control device 90 outputs a control signal to the automatic transmission 61 to control the gear ratio of the automatic transmission 61.

[0026] When a predetermined stop condition is satisfied, the control device 90 executes a stop process that interrupts the combustion of fuel in the cylinders 11 and controls the throttle valve 21 to a closed state. In addition, in the stop process, the control device 90 controls the clutch 31 to a released state by outputting a control signal to the clutch 31. Note that one example of a stop condition is that the accelerator operation amount ACC becomes zero, thereby reducing the vehicle required driving force.

[0027] Moreover, the control device 90 executes an intake air introduction process as part of the above-mentioned stop process. Specifically, the control device 90 executes the intake air introduction process immediately before the engine speed NE becomes zero. In this intake air introduction process, the control device 90 controls the throttle valve 21 to be in an open state. When this intake air introduction process is executed, a large amount of intake air is introduced from the intake passage 12 into the cylinder 11 that is undergoing an intake stroke immediately before the engine speed NE becomes zero. Then, when the cylinder 11 is undergoing a compression stroke, a compression reaction force of the intake air is generated, and the rotation of the crankshaft 18 stops. As a result, when the engine speed NE becomes zero, the piston 16 in the cylinder 11 that is undergoing a compression stroke stops at a predetermined position. The control device 90 controls the throttle valve 21 to be in a closed state after the engine speed NE becomes zero.

[0028] When a request for restarting the internal combustion engine 10 is made while the internal combustion engine 10 is stopped after the execution of the stop process, the control device 90 executes a restart process to restart the combustion of fuel in the cylinder 11. Specifically, as the restart process, the control device 90 first controls the connection state of the clutch 31 to a semi-engaged state by outputting a control signal to the clutch 31. Then, the control device 90 applies torque from the rotating shaft 41 of the motor generator 40 to the crankshaft 18 of the internal combustion engine 10 via the clutch 31 by outputting a control signal to the inverter 72. As a result, the engine rotation speed NE increases. Furthermore, the control device 90 controls the port injection valve 22 and the in-cylinder injection valve 23 to supply fuel into the cylinder 11. In addition, the control device 90 controls the ignition device 24 to ignite the mixture of fuel and intake air in the cylinder 11 by spark discharge. Then, the internal combustion engine 10 starts to operate autonomously, and the engine rotation speed NE and the motor rotation speed NM become equal to each other. Then, the control device 90 controls the connection state of the clutch 31 to a fully engaged state by outputting a control signal to the clutch 31. As a result, the restart of the internal combustion engine 10 is completed. Note that, an example of a case where there is a request to restart the internal combustion engine 10 is when the accelerator operation amount ACC becomes larger than zero, causing the vehicle required driving force to increase.

[0029] The control device 90 may be configured as a circuit including one or more processors that execute various processes according to a computer program (software). The control device 90 may also be configured as a circuit including one or more dedicated hardware circuits, such as an application specific integrated circuit (ASIC), that execute at least a part of the various processes, or a combination thereof. The processor includes a CPU and memories such as RAM and ROM. The memory stores program codes or instructions that are configured to cause the CPU to execute processes. The memory, i.e., computer-readable medium, includes any medium that can be accessed by a general-purpose or dedicated computer.

[0030] <Throttle valve opening control during restart> Next, a description will be given of the opening control of the throttle valve 21 performed by the control device 90 when restarting the internal combustion engine 10. The control device 90 executes a series of opening control when a request to restart the internal combustion engine 10 is made.

[0031] As shown in Fig. 3, when the control device 90 starts the opening control of the throttle valve 21, the control device 90 proceeds to the process of step S11. In step S11, the control device 90 sets a predetermined period TA based on the motor rotation speed NM when a request to restart the internal combustion engine 10 is made. Specifically, the higher the motor rotation speed NM when a request to restart the internal combustion engine 10 is made, the longer the value set by the control device 90 as the predetermined period TA. Here, an example of the predetermined period TA is about several tens of msec to one hundred and several tens of msec. Thereafter, the control device 90 proceeds to the process of step S21.

[0032] In step S21, the control device 90 acquires an elapsed period TX, which is the period that has elapsed since the intake air introduction process was started until the processing time of step S21. If the intake air introduction process has not been started at the processing time of step S21, the control device 90 acquires the elapsed period TX as zero. Then, the control device 90 determines whether the elapsed period TX is longer than a predetermined period TA.

[0033] The elapsed time TX is equal to or shorter than the predetermined time TA in the following circumstances, for example. Assume that the driver operates the accelerator pedal to zero, thereby satisfying the stop condition. At this time, the combustion of fuel in the cylinders 11 is interrupted, and the engine speed NE decreases. When the engine speed NE becomes extremely close to zero, the intake air introduction process is started. After the intake air introduction process is started, the driver operates the accelerator pedal to a value greater than zero before the predetermined time TA has elapsed. Then, in the middle of the intake air introduction process, the internal combustion engine 10 is restarted, and the processes of steps S11 and S21 are performed in sequence. In this situation, it is determined in step S21 that the elapsed time TX is equal to or shorter than the predetermined time TA.

[0034] Here, the downstream pressure is the pressure of the intake air downstream of the throttle valve 21 in the intake passage 12. In the internal combustion engine 10, when the throttle valve 21 is closed by the stop process, the downstream pressure becomes lower than the atmospheric pressure. Then, when the throttle valve 21 is opened by the intake air introduction process thereafter, the downstream pressure increases. At this time, the downstream pressure tends to approach the atmospheric pressure as the period from the start of the intake air introduction process becomes longer. Therefore, the process of step S21 is an example of a process for determining whether the downstream pressure when a request to restart the internal combustion engine 10 is made is equal to or lower than a predetermined specified pressure. The specified pressure is set to be lower than the atmospheric pressure, for example. The specified pressure is set to be higher than the lower limit value that the downstream pressure can have after the start of the stop process when the above-mentioned intake air introduction process is not executed.

[0035] In step S21, when the control device 90 determines that the elapsed period TX is longer than the predetermined period TA (S21: YES), the control device 90 advances the process to step S31. In other words, when the downstream pressure at the time when the restart of the internal combustion engine 10 is requested is higher than the specified pressure, the control device 90 advances the process to step S31.

[0036] In step S31, the control device 90 controls the opening of the throttle valve 21 to a predetermined normal opening. Here, the normal opening is an opening that ensures a required amount of intake air when the internal combustion engine 10 is restarted on the assumption that the downstream pressure is approximately atmospheric pressure. Thereafter, the control device 90 ends the current opening control.

[0037] On the other hand, in the above-mentioned step S21, when the control device 90 determines that the elapsed period TX is equal to or shorter than the predetermined period TA (S21: NO), the control device 90 advances the process to step S41. In other words, when the downstream pressure at the time when the restart of the internal combustion engine 10 is requested is equal to or lower than the specified pressure, the control device 90 advances the process to step S41.

[0038] In step S41, the control device 90 controls the opening of the throttle valve 21 to a predetermined increased opening. Here, the increased opening is an opening larger than the normal opening in step S21. The control device 90 uses a larger increased opening as the motor rotation speed NM when a request to restart the internal combustion engine 10 is made is higher. That is, the control device 90 increases the opening of the throttle valve 21 as the motor rotation speed NM when a request to restart the internal combustion engine 10 is made is higher. In this embodiment, the process of step S41 is an increase process that increases the opening of the throttle valve 21 during the restart process. Thereafter, the control device 90 ends the current opening control.

[0039] <Action of this embodiment> When the stop process is executed in the vehicle 100, the throttle valve 21 is controlled to a closed state. At this time, even if the throttle valve 21 is in a closed state by the stop process, a small amount of gas is generally allowed to flow through the intake passage 12. Then, immediately after the stop process is executed, the engine speed NE is higher than zero. Therefore, each cylinder 11 repeats an intake stroke, a compression stroke, a combustion stroke, and an exhaust stroke, so that gas flows through the intake passage 12, the cylinder 11, and the exhaust passage 13 in this order. When gas flows in this manner, the downstream pressure becomes lower than the atmospheric pressure.

[0040] Furthermore, in the vehicle 100, when the intake air introduction process is executed after the start of the stop process, the throttle valve 21 is controlled to be in an open state. When the throttle valve 21 is in an open state in this manner, gas flows more easily from the upstream side to the downstream side as viewed from the throttle valve 21 in the intake passage 12, so the downstream pressure increases. At this time, the longer the period from the start of the intake air introduction process, the closer the downstream pressure becomes to atmospheric pressure.

[0041] Therefore, during the period from when the stop process is started to when the intake air introduction process is started, and immediately after the intake air introduction process is started, the downstream pressure is lower than the atmospheric pressure. If a request to restart the internal combustion engine 10 is made when the downstream pressure is low in this manner, the amount of intake air introduced from the intake passage 12 to the cylinder 11 during the restart process is likely to be small.

[0042] <Effects of this embodiment> (1) When the determination in step S21 is negative, i.e., when the downstream pressure at the time when the restart of the internal combustion engine 10 is requested is equal to or lower than the specified pressure, the control device 90 controls the opening of the throttle valve 21 to be increased in the increasing process of step S41. This makes it possible to quickly increase the downstream pressure during the restart process.

[0043] (2) In the increase process, the control device 90 increases the opening of the throttle valve 21 as the motor rotation speed NM at the time of the request to restart the internal combustion engine 10 increases. Therefore, even if the downstream pressure is low due to the stop process, the downstream pressure during the restart process increases more quickly as the motor rotation speed NM at the time of the request to restart the internal combustion engine 10 increases. Then, the amount of intake air introduced from the intake passage 12 to the cylinder 11 increases. This allows a large amount of fuel to be burned in the cylinder 11 during the restart process. As a result, the engine rotation speed NE can be increased more quickly during the restart process as the motor rotation speed NM at the time of the request to restart the internal combustion engine 10 increases. If the engine rotation speed NE increases more quickly, the period until the engine rotation speed NE and the motor rotation speed NM match is shortened. In addition, the period from the request to restart the internal combustion engine 10 until the connection state of the clutch 31 becomes a fully engaged state is also shortened, so that the restart of the internal combustion engine 10 can be completed quickly.

[0044] (3) The control device 90 sets a longer value as the predetermined period TA as the motor rotation speed NM is higher when a request to restart the internal combustion engine 10 is made. As a result, in step S21, it is more likely that the elapsed period TX is determined to be equal to or shorter than the predetermined period TA. In other words, the higher the motor rotation speed NM is when a request to restart the internal combustion engine 10 is made, the more likely that a negative determination will be made in the processing of step S21. As a result, it is more likely that the increase processing of step S41 will be executed.

[0045] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

[0046] In the above embodiment, the opening control of the throttle valve 21 when the internal combustion engine 10 is restarted may be changed. For example, in step S11, the control device 90 may set a predetermined constant value as the predetermined period TA, regardless of the motor rotation speed NM when a request to restart the internal combustion engine 10 is made.

[0047] For example, the process of determining whether the downstream pressure when a request to restart the internal combustion engine 10 is made is equal to or lower than a predetermined specified pressure may be changed. As a specific example, in step S21, the control device 90 acquires, for example, a value detected by a pressure sensor attached to the intake passage 12 as the downstream pressure when a request to restart the internal combustion engine 10 is made. Then, the control device 90 may determine whether the downstream pressure acquired by the pressure sensor is equal to or lower than a predetermined specified pressure. In this case, the process of step S11 can be omitted.

[0048] In the above embodiment, the configuration of the vehicle 100 may be changed. For example, the internal combustion engine 10 may have five or fewer cylinders 11, or may have seven or more cylinders 11. [Explanation of symbols]

[0049] 10. Internal combustion engine 11…Cylinder 12…Intake passage 13...Exhaust passage 16…Piston 17…Connecting rod 18…Crankshaft 21...Throttle valve 22...Port injection valve 23...In-cylinder injection valve 24…Ignition device 26…Intake valve 27…Exhaust valve 31…Clutch 40…Motor generator 41...Rotation axis 61…Automatic transmission 62…Differential mechanism 63...Drive wheel 71…Battery 72…Inverter 81...Accelerator operation amount sensor 82...Vehicle speed sensor 83...Crank angle sensor 84...Rotation angle sensor 90...Control device 100…Vehicle

Claims

[Claim 1] an internal combustion engine having a crankshaft; a motor generator having a rotating shaft; a clutch interposed between the crankshaft and the rotating shaft and switchable between an engaged state and a released state; a drive wheel connected to the crankshaft via the rotating shaft and the clutch, a stop process for stopping combustion of fuel in cylinders of the internal combustion engine and controlling a throttle valve of the internal combustion engine to a closed state when a predetermined stop condition is satisfied; a restart process for restarting the combustion of fuel in the cylinders when a request to restart the internal combustion engine is received after the stop process; an increasing process for increasing the opening degree of the throttle valve during the restart process when a downstream pressure, which is the pressure of the intake air when the restart request is made and is the pressure of the intake air downstream as viewed from the throttle valve, is equal to or lower than a predetermined specified pressure, compared to when the downstream pressure is higher than the specified pressure; In the increase process, when the downstream pressure is equal to or lower than the specified pressure, the higher the rotation speed of the rotary shaft when the restart request is made, the larger the opening degree of the throttle valve is. Vehicle control device.

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