JP2015151997A - Control device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of an internal combustion engine which can suppress the deterioration of startability which occurs when ignition is not achieved at the execution of the heating of fuel, in the control device of the internal combustion engine in which an alcohol is contained in the fuel.SOLUTION: When the heating of fuel is not performed in a combustion chamber 3 until a determination time elapses after a start point of the start processing of an internal combustion engine, the internal combustion engine is transited to the air-scavenging of the combustion chamber 3 from an execution state of the start processing. After the execution of the air-scavenging of the combustion chamber 3, the start processing is performed once again. The determination time (ignition determination time) in the start processing at the heating of fuel supplied to a fuel injection valve 6 by a heater 16 is set shorter than that at the non-heating of the fuel. Therefore, it is suppressed that ignition determination is performed during a period in which a possibility of ignition is low. Furthermore, since the determination time becomes short so that the amount of fuel injected during the determination time is reduced, the injection of the non-heated fuel after the completion of the injection of the heated fuel can be suppressed, and plug fogging resulting from the injection can be suppressed.

Description

  The present invention relates to a control device for an internal combustion engine.

  The start of the self-sustained operation of the internal combustion engine is realized by performing cranking and fuel injection as start-up processing of the engine, and igniting with a fuel spark plug in the combustion chamber accordingly.

  However, if the fuel contains alcohol, the fuel is less likely to vaporize depending on the alcohol concentration and temperature of the fuel, and the ignitability of the fuel may be greatly reduced depending on the situation. If the start-up process is continued without realizing the ignition of fuel in the combustion chamber, there is a possibility that the cold fuel adheres to the spark plug and cannot be ignited.

  For this reason, when the ignition of the fuel in the combustion chamber is not realized before the determination time (ignition determination time) elapses from the start of the start processing, the start processing is stopped and the combustion chamber is scavenged, and then the start processing is performed. It is conceivable to execute again. Moreover, as shown in Patent Document 1, it has been proposed to heat the fuel by a heating device so that the fuel is easily vaporized when the starting process is executed.

JP 2010-1765 A

  By the way, the heating device as described above has a limited volume of fuel that can be heated. For this reason, if the ignition determination time is about the same as when heating is not performed, fuel may be injected by the heating volume during the determination. In addition, after heating fuel is completely injected, non-heated fuel is injected. Therefore, the ignition determination is performed even though the fuel is not ignited, and plug covering (fuel attachment to the spark plug) occurs. There was a possibility.

  An object of the present invention is to provide a control device for an internal combustion engine that can suppress deterioration of startability that occurs when ignition is not realized when fuel is heated in a control device for an internal combustion engine in which alcohol is contained in the fuel. is there.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
In a control device for an internal combustion engine that solves the above-described problems, cranking and fuel injection are performed as start-up processing of the internal combustion engine. Further, if ignition of the fuel by the spark plug in the combustion chamber is not realized before the determination time elapses from the start of the start processing, the start processing is stopped and the combustion chamber is scavenged, and then the start processing is performed again. Run. In addition, the control device for the internal combustion engine includes a heating device that heats the fuel based on at least one of the alcohol concentration and the temperature of the fuel used for fuel injection when performing the starting process. During scavenging of the combustion chamber, fuel consumption due to fuel injection from the fuel injection valve is reduced, so that the fuel supplied to the fuel injection valve can be effectively heated by the heating device. Then, when the starting process is performed again after scavenging the combustion chamber, the fuel that has been effectively heated is used, so that the self-sustained operation of the internal combustion engine is easily realized.

  The control device for the internal combustion engine also includes a control unit that shortens the determination time when the fuel is heated by the heating device than when the heating is not performed. For this reason, when the fuel is heated, the amount of fuel injected is reduced by shortening the determination time compared to when the fuel is not heated. Therefore, the injection amount of the non-heated fuel is suppressed. be able to. As a result, it is possible to suppress the ignition determination during a period where the possibility of ignition is low, and it is possible to suppress the plug covering that occurs when the non-heated fuel is injected.

1 is a schematic diagram showing the overall configuration of an internal combustion engine and its control device. The flowchart which shows the procedure which starts the internal combustion engine of a stop state. The flowchart which shows the procedure which adjusts a throttle valve when performing a starting process and scavenging.

[First Embodiment]
Hereinafter, a first embodiment of a control device for an internal combustion engine mounted on a vehicle will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the intake passage 2 of the internal combustion engine 1 is provided with a throttle valve 4 that opens and closes to adjust the amount of air taken into the combustion chamber 3 (intake air amount). The internal combustion engine 1 also includes a fuel injection valve 6 that injects fuel from the intake passage 2 toward the intake port 2 a of the combustion chamber 3. As the fuel for the internal combustion engine 1, it is possible to use only gasoline, a mixture of gasoline and alcohol, or only alcohol. The fuel in the fuel tank 17 pumped up by the feed pump 18 is supplied to the fuel injection valve 6 through a fuel pipe 19 and a delivery pipe 20.

  The delivery pipe 20 is provided with a heating device 16 for heating the fuel supplied to the fuel injection valve 6. The heating of the fuel by the device 16 is performed when the internal combustion engine 1 is started and a fuel with low volatility is used, for example, when a fuel consisting only of alcohol is used, or a fuel in which gasoline and alcohol are mixed. This is done when using a high alcohol concentration.

  In such an internal combustion engine 1, the combustion chamber 3 is filled with an air-fuel mixture composed of fuel injected from the fuel injection valve 6 and air flowing through the intake passage 2. When the air-fuel mixture is ignited by the spark plug 12, the air-fuel mixture burns, the piston 13 reciprocates due to the combustion energy at that time, and the crankshaft 14 rotates accordingly. On the other hand, the air-fuel mixture after combustion is sent to the exhaust passage 15 as exhaust gas.

  The crankshaft 14 is connected to a starter 10 that forcibly rotates (cranks) the crankshaft 14 when executing a starting process for starting the internal combustion engine 1. In the start-up process of the internal combustion engine 1, fuel injection from the fuel injection valve 6 is performed while cranking the engine 1, whereby the air-fuel mixture filled in the combustion chamber 3 is ignited by the spark plug 12. Is done. Then, the air-fuel mixture in the combustion chamber 3 is combusted (ignited) through ignition by the spark plug 12, and the internal combustion engine 1 starts a self-sustained operation along with this, whereby the engine 1 is started.

  The control device for the internal combustion engine 1 includes an electronic control device 21 that controls various operations of the engine 1. The electronic control device 21 includes a CPU that executes various arithmetic processes related to the various operation controls, a ROM that stores programs and data necessary for the control, a RAM that temporarily stores CPU calculation results, An input / output port for inputting / outputting a signal is provided.

Various sensors shown below are connected to the input port of the electronic control unit 21.
A start switch 22 that is operated by the driver when starting the internal combustion engine 1.
A throttle position sensor 23 that detects the throttle opening.

An intake pressure sensor 24 that detects the pressure (intake pressure) downstream of the throttle valve 4 in the intake passage 2.
A crank position sensor 25 that outputs a signal corresponding to the rotation of the crankshaft 14.

An alcohol concentration sensor 26 that detects the alcohol concentration of the fuel supplied to the fuel injection valve 6.
A fuel temperature sensor 27 that detects the temperature of the fuel supplied to the fuel injection valve 6.

An air-fuel ratio sensor 31 that outputs a signal corresponding to the oxygen concentration in the exhaust gas flowing through the exhaust passage 15.
The output port of the electronic control device 21 is connected to drive circuits for various devices related to the operation of the internal combustion engine 1, such as the throttle valve 4, the fuel injection valve 6, the starter 10, the spark plug 12, and the heating device 16. ing.

  The electronic control device 21 grasps the operation state of the internal combustion engine 1 and the drive command state for the engine 1 based on signals input from the various sensors and the like, and based on these, the throttle valve 4, the fuel injection valve 6, the starter 10, Command signals are output to drive circuits of various devices such as the spark plug 12 and the heating device 16. In this way, various controls relating to the operation of the internal combustion engine 1 such as throttle opening control, fuel injection amount control, engine start, ignition timing control, and fuel heating of the internal combustion engine 1 are performed through the electronic control unit 21.

Next, the start of the internal combustion engine 1 (start of self-sustaining operation) performed through the electronic control device 21 will be described in detail.
FIG. 2 is a flowchart showing a procedure for starting the internal combustion engine 1 in a stopped state. When the driver turns on the start switch 22, the electronic control device 21 determines that a start command for the internal combustion engine 1 has been issued, and starts a process for starting the internal combustion engine 1 in a stopped state.

  Specifically, the electronic control unit 21 first determines whether there is a request for heating of the fuel supplied to the fuel injection valve 6 as the processing of step 101 (S101). The determination that there is a fuel heating request here is made based on, for example, that at least one of the following conditions (A) and (B) is satisfied. (A) The alcohol concentration of the fuel is a high value equal to or higher than the concentration determination value. (B) The temperature of the fuel is a low value less than the temperature judgment value.

  Both the condition (A) and the condition (B) mean that the fuel injected from the fuel injection valve 6 is hardly vaporized when the condition is satisfied. Therefore, when at least one of the condition (A) and the condition (B) is satisfied, the fuel supplied to the fuel injection valve 6 is made easier to vaporize the fuel injected from the fuel injection valve 6. The heating request is made. It should be noted that when both the condition (A) and the condition (B) are not satisfied, it is determined that there is no fuel heating request.

  If it is determined in S101 that there is no fuel heating request, the electronic control unit 21 executes the start process of S105 to start the internal combustion engine 1 after setting the determination time T to time T2 as the process of S104. On the other hand, when it is determined in S101 that there is a fuel heating request, the electronic control unit 21 sets the determination time T to a time T1 shorter than the time T2 in the processing of S102, and then the heating device 16 in the processing of S103. After performing the heating process for heating the fuel supplied to the fuel injection valve 6 by the above, the start process of S105 is performed to start the internal combustion engine 1.

  The determination time T is a value used for determining whether or not to stop the start process executed through S105. That is, the electronic control unit determines whether or not fuel ignition in the combustion chamber 3 has been realized as the process of S106 before the determination time T elapses from the start of the start process. When the ignition of the fuel in the combustion chamber 3 (start of the self-sustaining operation of the internal combustion engine 1) is realized by executing the start-up process, that is, when an affirmative determination is made in S106, the electronic control device 21 Various operation controls corresponding to the independent operation are executed. On the other hand, if a negative determination is made in S106, the electronic control unit 21 stops the start-up process as a process of S107, and further performs the scavenging in the combustion chamber 3 as a process of S108, and then executes the processes after S102. To do.

Next, the processing of S105 to S108 will be described in detail.
In the starting process of S105, fuel is injected from the fuel injection valve 6 while cranking the internal combustion engine 1 through driving of the starter 10, whereby the air-fuel mixture filled in the combustion chamber 3 is ignited by the ignition plug 12. Is done. If the air-fuel mixture in the combustion chamber 3 does not combust (ignition) through ignition by the spark plug 12 until the determination time T elapses from the start of such starting processing, that is, if a negative determination is made in S106, the fuel in S107 When the fuel injection from the injection valve 6 is stopped, the start-up process is stopped.

  Furthermore, in S108, scavenging of the combustion chamber 3 is performed in order to prevent fuel from adhering to the spark plug 12 by performing cranking of the internal combustion engine 1 while fuel injection from the fuel injection valve 6 is stopped. The fuel is heated by the heating device 16 during the scavenging. Since the fuel injection from the fuel injection valve 6 is stopped during the scavenging, the fuel supplied to the fuel injection valve 6 can be effectively heated by the heating device 16. The scavenging (cranking in a state where fuel injection is stopped) is continued until the temperature of the fuel supplied to the fuel injection valve 6 rises and reaches a predetermined determination value.

  After the scavenging of the combustion chamber 3 in S108, the processing after S102 is executed, and in S105 at that time, the start-up processing is executed again under the condition that the scavenging has ended. Thus, the start-up process of the internal combustion engine 1 and the scavenging of the combustion chamber 3 are repeated until the air-fuel mixture is ignited in the combustion chamber 3 and the self-sustained operation of the internal combustion engine 1 is started. In the start-up process performed after scavenging, fuel that is effectively heated by the heating device 16 during scavenging is used, so that ignition of the air-fuel mixture in the combustion chamber 3 (self-sustained operation of the internal combustion engine 1) is realized. It becomes easy to let you.

Next, the operation of the control device for the internal combustion engine 1 will be described.
When the start process is performed, if the alcohol concentration of the fuel injected from the fuel injection valve 6 is high or the temperature of the fuel is low, the fuel is less likely to vaporize and the combustion chamber 3 is used when the start process is performed. This makes it difficult to ignite the air-fuel mixture (fuel). For this reason, when it becomes difficult to vaporize the fuel as described above, the fuel is heated by the heating device 16 so that the fuel is easily vaporized.

  However, since the heating volume of the fuel by the heating device 16 is limited, even if the heating is performed, the determination in the combustion chamber 3 before the determination time T (ignition determination time) elapses from the start of the starting process. Fuel ignition may not be possible. That is, if the determination time T is set to a normal time (time T2) when the fuel is heated, the fuel for the heating volume is completely injected during the determination time T (ignition determination). In other words, unheated fuel may be injected. In this case, the ignition is determined even though the fuel is not ignited. Further, there is a possibility that fuel adhesion (plug covering) to the spark plug 12 may occur due to the injection of non-heated fuel. For these reasons, the startability of the internal combustion engine 1 deteriorates if ignition of the fuel is not realized when the fuel is heated.

  In order to cope with such a situation, when the fuel is heated by the heating device 16 in executing the starting process, the determination time T (ignition determination time) is the time T2 when the heating device 16 does not heat the fuel. Shorter time T1. For this reason, it is possible to suppress the ignition determination during a period in which there is a low possibility of ignition, quickly stop the ignition determination (execution state of the start process), and shift to scavenging of the combustion chamber 3. The starting process can be redone. As a result, the internal combustion engine 1 comes to operate autonomously at an early stage after the start of the first start process. In addition, since the determination time T is shorter when the fuel is heated than when it is not heated, the amount of fuel injected during the determination time T is reduced, so the injection amount of the non-heated fuel is suppressed. be able to. As a result, it is possible to suppress the plug covering that occurs due to the injection of non-heated fuel, and to suppress the deterioration of the startability of the internal combustion engine 1 due to the plug covering.

According to the embodiment described in detail above, the following effects can be obtained.
(1) In the internal combustion engine 1 in which alcohol is contained in the fuel, it is possible to suppress deterioration in startability that occurs when ignition is not realized when the fuel is heated.

  (2) During scavenging in the combustion chamber 3, the fuel supplied from the fuel injection valve 6 is heated by the heating device 16 and the fuel injection from the fuel injection valve 6 is stopped. Can be heated. Then, scavenging in the combustion chamber 3 is continued until the temperature of the fuel rises and reaches the determination value, and the start-up process is performed again after the scavenging ends. Therefore, in the start-up process after scavenging, the fuel that has been heated effectively during scavenging and heated up to the determination value is used for fuel injection from the fuel injection valve 6. From this, it becomes easy to realize ignition of the air-fuel mixture in the combustion chamber 3 (self-sustaining operation of the internal combustion engine 1) in the start-up process after scavenging.

[Second Embodiment]
Next, a second embodiment of the control device for an internal combustion engine will be described with reference to FIG.
In this embodiment, when the starting process is performed, the pressure downstream of the throttle valve 4 in the intake passage 2 is reduced (the negative pressure is increased), so that the fuel injected from the fuel injection valve 6 is easily vaporized. ing. Further, in this embodiment, the scavenging of the combustion chamber 3 is efficiently performed by adjusting the throttle valve 4 to the open side during the scavenging of the combustion chamber 3.

  FIG. 3 is a flowchart showing a procedure for adjusting the throttle valve 4 when executing the starting process and the scavenging. When the driver turns on the start switch 22, the electronic control unit 21 determines that a start command for the internal combustion engine 1 has been issued, and in response to the execution of the start process and the execution of the scavenging, Make adjustments.

  Specifically, the electronic control unit 21 first lowers the pressure downstream of the throttle valve 4 in the intake passage 2 (increases the negative pressure) in order to facilitate the vaporization of the fuel injected from the fuel injection valve 6 as a process of S201. Determine whether or not it is necessary. Such a determination is made based on whether there is a fuel heating request by the heating device 16 and whether the fuel is being heated by the heating device 16.

  That is, when there is no heating request and heating is not in progress, it is determined in S201 that the pressure downstream of the throttle valve 4 in the intake passage 2 does not need to be reduced (negative determination), and the process proceeds to S209. The electronic control unit 21 adjusts the throttle valve 4 to an opening corresponding to the idle rotation speed of the internal combustion engine 1 as a process of S209. On the other hand, if there is no heating request and heating is not in progress, it is determined in S201 that the pressure downstream of the throttle valve 4 in the intake passage 2 needs to be lowered (affirmative determination), and the process proceeds to S202. The electronic control unit 21 adjusts the throttle valve 4 to be fully closed as a process of S202. As a result, the pressure downstream of the throttle valve 4 in the intake passage 2 decreases.

  The electronic control unit 21 determines whether or not scavenging in the combustion chamber 3 is being performed as the process of S203. If a negative determination is made here, the process proceeds to S204, the throttle valve 4 is adjusted to be fully closed (the fully closed state is maintained), and then the process proceeds to S205. In step S205, the electronic control unit 21 determines whether the negative pressure downstream of the throttle valve 4 in the intake passage 2 is sufficient to facilitate vaporization of the fuel injected from the fuel injection valve 6. Incidentally, the determination here may be made based on the actually measured value of the negative pressure by the intake pressure sensor 24, or the number of times of passing through the top dead center from the cranking start time in the starting process (the number of intakes of the internal combustion engine 1). May be performed based on the estimated value of the negative pressure obtained from the above.

  When a negative determination is made in S205, the electronic control unit 21 prohibits fuel injection from the fuel injection valve 6 as a process of S206. By prohibiting fuel injection in this way, cranking is performed while adjusting the throttle valve 4 to be fully closed in a state where fuel injection from the fuel injection valve 6 in the start-up process is prohibited. As a result, the pressure downstream of the throttle valve 4 in the intake passage 2 quickly decreases. Then, after the process of S206 is executed, the process returns to S205.

  On the other hand, when an affirmative determination is made in S205, the electronic control unit 21 permits fuel injection from the fuel injection valve 6 as a process in S207. As a result, fuel injection from the fuel injection valve 6 in the starting process is performed in a state where the negative pressure downstream of the throttle valve 4 in the intake passage 2 becomes a value that facilitates vaporization of the fuel injected from the fuel injection valve 6. Will be done.

  In step S208, the electronic control unit 21 determines whether the engine rotational speed obtained based on the detection signal from the crank position sensor 25 is equal to or higher than a determination value that is faster than the rotational speed during cranking. It is determined whether the start of 1 is completed. That is, when the engine speed is equal to or higher than the determination value, it is determined that the internal combustion engine 1 has been started (independent operation has started), and the process proceeds to S209. If the engine speed is less than the determination value, it is determined that the internal combustion engine 1 has not been started, and the process proceeds to S203.

  If it is determined in S203 that the combustion chamber 3 is being scavenged, the process proceeds to S210. The electronic control unit 21 adjusts the throttle valve 4 to an opening corresponding to the idling rotational speed of the internal combustion engine 1 as the process of S210, and prohibits fuel injection from the fuel injection valve 6 as the subsequent process of S211. Therefore, when the start process is shifted to the scavenging of the combustion chamber 3, the throttle valve 4 is adjusted to the open side from the fully closed position to the opening corresponding to the idle rotational speed. Thereby, scavenging of the combustion chamber 3 is performed efficiently.

According to the embodiment described above in detail, the following effects can be obtained in addition to the effects of the first embodiment.
(3) When the starting process of the internal combustion engine 1 is executed, the throttle valve 4 is adjusted to be fully closed so that the pressure on the downstream side of the throttle valve 4 in the intake passage 2 is injected from the fuel injection valve 6. It is lowered until the value is set to facilitate vaporization of the fuel. Then, after such a decrease in pressure is realized, fuel injection from the fuel injection valve 6 is performed in the starting process. Thereby, fuel injection from the fuel injection valve 6 in the start-up process can be performed under conditions where the fuel is easily vaporized, and fuel injection from the fuel injection valve 6 under conditions where the fuel is difficult to vaporize is suppressed. The stopped internal combustion engine 1 can be started (start of self-sustaining operation) more quickly.

  (4) When ignition of fuel in the combustion chamber 3 (start of self-sustaining operation of the internal combustion engine 1) is not realized before the determination time T elapses from the start time of the start process, the start process execution state To the scavenging of the combustion chamber 3, while the scavenging is being performed, the throttle valve 4 is adjusted to the opening side rather than the fully closed state. Specifically, the throttle valve 4 is adjusted to the open side from the fully closed position to the opening corresponding to the idle rotational speed. For this reason, scavenging in the combustion chamber 3 can be performed efficiently, and adhesion of cold fuel to the spark plug 12 in the combustion chamber 3 can be prevented.

  (5) When the starting process is performed again after scavenging in the combustion chamber 3, the throttle valve 4 is adjusted to the closed side until the throttle valve 4 is fully closed from the opening corresponding to the idle rotation speed. Thus, starting after scavenging in the combustion chamber 3 in a state where the pressure on the downstream side of the throttle valve 4 in the intake passage 2 is reduced to a value that facilitates vaporization of the fuel injected from the fuel injection valve 6. Processing can be executed.

[Other Embodiments]
In addition, the said embodiment can also be changed as follows, for example.
In the second embodiment, the pressure downstream of the throttle valve 4 in the intake passage 2 based on whether there is a fuel heating request by the heating device 16 and whether the fuel is being heated by the heating device 16. Although it is determined whether or not it is necessary to lower the pressure (increase the negative pressure), such a determination may be made based on the actual measurement value of the pressure by the intake pressure sensor 24. Further, such a determination may be made based on the estimated value of the pressure obtained from the number of top dead center passages (corresponding to the number of intakes of the internal combustion engine 1) from the cranking start time.

  In the second embodiment, when the pressure downstream of the throttle valve 4 in the intake passage 2 is reduced in order to easily vaporize the fuel injected from the fuel injection valve 6, it is not necessary to adjust the throttle valve 4 to be fully closed. Alternatively, for example, the opening may be adjusted to an opening closer to the opening than the opening corresponding to the idle rotation speed and to an opening closer to the opening than the fully closed.

  In the second embodiment, scavenging in the combustion chamber 3 is performed by adjusting the opening of the throttle valve 4 to an opening that is more open than the fully-closed position and other than the opening corresponding to the idle rotation speed. May be. In this case, it is preferable to adjust the opening of the throttle valve 4 to an opening on the opening side of the opening corresponding to the idle rotation speed.

  In the first embodiment, the temperature of the fuel supplied to the fuel injection valve 6 at the start of the internal combustion engine 1 is estimated based on the engine temperature and the stop period of the internal combustion engine 1 instead of actually measuring the fuel temperature sensor 27. May be.

In the first embodiment, the determination that there is a fuel heating request may be made on the basis that either one of the conditions (A) and (B) is satisfied.
In the first embodiment, the alcohol concentration of the fuel may be estimated based on the detected value of the air-fuel ratio sensor 31 during the operation of the internal combustion engine 1 instead of being detected by the alcohol concentration sensor 26.

  In the first and second embodiments, scavenging of the combustion chamber 3 is realized by stopping the fuel injection from the fuel injection valve 6 during cranking, but may be realized by reducing the fuel injection amount in the fuel injection valve 6. Good.

  In the first and second embodiments, the heating device 16 may be provided in the fuel injection valve 6 instead of being provided in the delivery pipe 20.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Intake passage, 2a ... Intake port, 3 ... Combustion chamber, 4 ... Throttle valve, 6 ... Fuel injection valve, 10 ... Starter, 12 ... Spark plug, 13 ... Piston, 14 ... Crankshaft, 15 DESCRIPTION OF SYMBOLS ... Exhaust passage, 16 ... Heating device, 17 ... Fuel tank, 18 ... Feed pump, 19 ... Fuel piping, 20 ... Delivery pipe, 21 ... Electronic control unit, 22 ... Start switch, 23 ... Throttle position sensor, 24 ... Intake pressure Sensor: 25 ... Crank position sensor, 26 ... Alcohol concentration sensor, 27 ... Fuel temperature sensor, 31 ... Air-fuel ratio sensor.

Claims (1)

Cranking and fuel injection are performed as a starting process of the internal combustion engine. When ignition by a spark plug of fuel in the combustion chamber is not realized before the determination time elapses from the start of the starting process, the starting process is stopped and In a control device for an internal combustion engine that scavenges a combustion chamber and then executes the start-up process again,
A heating device for heating the fuel based on at least one of an alcohol concentration and a temperature of the fuel used for the fuel injection in performing the starting process;
A controller that shortens the determination time when the fuel is heated by the heating device than when the fuel is not heated;
A control device for an internal combustion engine, comprising: