JP2016098662A - Internal combustion engine control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine control device that can suppress deterioration in startability of an internal combustion engine even when volatile components contained in fuel are vaporized and property of the fuel varies.SOLUTION: The control device 8 for controlling the internal combustion engine 1 that can use alcohol mixed fuel performs heating control of heating a fuel injection valve 3 before starting the internal combustion engine 1 when a start condition for starting the internal combustion engine 1 is satisfied. The control device 8 extends execution time of the heating control longer as a stop period from the stop of the internal combustion engine 1 to satisfaction of the start condition is longer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control device for an internal combustion engine that can use an alcohol-mixed fuel.

  In recent years, an internal combustion engine that can use an alcohol-mixed fuel has been put into practical use. The alcohol-mixed fuel is less likely to vaporize when the temperature is lower. For this reason, in the control apparatus for an internal combustion engine described in Patent Document 1, fuel vaporization is promoted by performing heating control for heating the fuel injection valve when the engine is started, and increasing the temperature of the fuel injection valve. I try to let them. Note that the alcohol-mixed fuel is less likely to vaporize even when the alcohol concentration is high. For this reason, in the technique described in Patent Document 1, the higher the alcohol concentration and the lower the engine water temperature at the time of starting the engine, the longer the execution time of the heating control, thereby improving the startability of the internal combustion engine. .

JP 2011-106363 A

  By the way, in a plug-in hybrid vehicle that includes an internal combustion engine and a motor as driving power sources and can charge a battery that supplies power to the motor from an external power source, the EV mode is configured to run the vehicle without driving the internal combustion engine. In some cases, the state in which the internal combustion engine is not driven continues for a long period of time due to repeated running and charging from an external power source.

  Here, when the internal combustion engine is not driven for a long period of time and the alcohol mixed fuel in the fuel tank is left for a long period of time, the volatile components in the alcohol mixed fuel volatilize. If the easily volatile components in the fuel volatilize in this way, even if the alcohol concentration of the fuel is the same, the fuel injected at the time of starting the internal combustion engine becomes difficult to vaporize, and the startability of the internal combustion engine may be deteriorated.

  For this reason, even if the execution time of the heating control executed at the time of starting the engine is calculated based on the alcohol concentration and the engine water temperature as in the control device described in Patent Document 1, the startability of the internal combustion engine is sufficiently deteriorated. It may not be possible to suppress it.

  The present invention has been made in view of these problems, and its purpose is to deteriorate the startability of an internal combustion engine even when the volatile components in the fuel volatilize and the properties of the fuel change. An object of the present invention is to provide a control device for an internal combustion engine that can suppress the above-described problem.

  An internal combustion engine controller for solving the above problems controls an internal combustion engine that can use alcohol-mixed fuel, and when a start condition for starting the internal combustion engine is satisfied, fuel injection is performed before starting the internal combustion engine. A control apparatus for an internal combustion engine that performs heating control for heating a valve, wherein the longer the stop period from when the internal combustion engine is stopped to when the start condition is satisfied, the longer the execution time of the heating control is.

  In the alcohol-mixed fuel in the fuel tank, the longer the internal combustion engine stop period, the more easily the components that volatilize in the fuel volatilize, and the more difficult it is to vaporize when injected from the fuel injection valve. For this reason, as in the above configuration, the longer the stop period from when the internal combustion engine is stopped until the start condition is satisfied, the longer the execution time of the heating control, so that the fuel tank can be left in the fuel tank for a long time. Even when the fuel is difficult to vaporize, the heating control can be performed by reflecting this influence, and the vaporization of the fuel can be preferably promoted.

Therefore, according to the above configuration, it is possible to suppress the deterioration of the startability of the internal combustion engine even when the volatile component in the fuel volatilizes and the property of the fuel changes.
In the control device for an internal combustion engine, it is desirable to calculate the execution time by reflecting the engine water temperature and the alcohol concentration of the fuel in addition to the stop period.

  When the engine water temperature is low, the fuel is less likely to vaporize. Also, the fuel is less likely to vaporize when the alcohol concentration of the fuel is high. For this reason, if the execution time of the heating control is calculated by reflecting the engine water temperature and the alcohol concentration in addition to the stop period as in the above configuration, the fuel can be easily vaporized by the engine water temperature and the alcohol concentration. The heating control can be executed in consideration of the influence on the fuel, and the vaporization of the fuel can be promoted more suitably.

  Further, in the control device for an internal combustion engine, when starting the internal combustion engine, an amount of fuel calculated based on the alcohol concentration of the fuel, the temperature of the fuel, and the intake air temperature is injected, and the engine rotational speed becomes the target rotational speed. If not, increase control is performed to increase the fuel injection amount so that the engine rotation speed matches the target rotation speed, and in addition to the stop period, the fuel increased by the increase control when the internal combustion engine was last started It is desirable to calculate the execution time by reflecting the amount of the above.

  Even when the fuel injection amount is calculated based on the alcohol concentration of the fuel, the temperature of the fuel, and the intake air temperature, which has a correlation with the ease of vaporization of the fuel, the volatile component in the fuel volatilizes and the fuel tank When the fuel stored inside is difficult to vaporize, the engine speed cannot be increased to the target speed. For this reason, in such a case, it is necessary to perform an increase control for increasing the amount of fuel.

  By the way, the amount increased by such increase control reflects the influence of the change in the properties of the fuel due to volatilization of the volatile components of the alcohol-mixed fuel. That is, the difference between the engine rotational speed and the target rotational speed increases as the fuel in the fuel tank is less likely to vaporize due to volatilization of easily volatile components, and the amount of fuel increased through the increase control increases. Become.

Therefore, by referring to the amount of fuel increased through the increase control, it is possible to estimate the ease of fuel vaporization when the internal combustion engine is started last time.
Therefore, if the execution time of the heating control is calculated by reflecting the amount of fuel increased by the increase control when the internal combustion engine was started last time in addition to the stop period as in the above configuration, the previous internal combustion engine is started. The characteristics of the fuel at this time can also be reflected in the execution time of the heating control.

In the control device for an internal combustion engine, it is desirable to calculate the execution time of the heating control by reflecting the temperature of the fuel in the stop period in addition to the stop period.
In the alcohol mixed fuel, even when the internal combustion engine is stopped for the same period, the higher the temperature of the fuel, the more easily the volatilized components in the fuel are volatilized and the change in the properties of the fuel is more likely to proceed.

  According to the above configuration, the execution time of the heating control is calculated by reflecting the temperature of the fuel in the stop period in addition to the stop period from when the internal combustion engine stops until the start condition is satisfied. The influence on the change in the properties of the fuel can also be reflected in the execution time of the heating control.

The schematic diagram which shows an example of the relationship between the control apparatus of an internal combustion engine, and the internal combustion engine which is the control object. The flowchart which shows the flow of a series of processes performed when the control condition of an internal combustion engine is satisfied. The flowchart which shows the flow of a series of processes concerning calculation of the execution time of the heating control which the control apparatus of an internal combustion engine performs. The graph which shows the relationship between the execution time of heating control, engine water temperature, and ethanol concentration.

  Hereinafter, an embodiment of a control device for an internal combustion engine will be described with reference to FIGS. Note that the control device for an internal combustion engine of the present embodiment is mounted on a plug-in hybrid vehicle and controls the internal combustion engine mounted on the vehicle.

  As shown in FIG. 1, a fuel injection valve 3 is provided in an intake passage 2 of an internal combustion engine 1 mounted on a vehicle. The fuel in the fuel tank 5 is supplied to the fuel injection valve 3 through the fuel supply passage 4. The fuel injected from the fuel injection valve 3 into the intake passage 2 is mixed with the intake air flowing through the intake passage 2 and introduced into the combustion chamber 6. The fuel injection valve 3 is provided with a heater 7 that generates heat when energized.

  The internal combustion engine 1 can use an ethanol mixed fuel obtained by mixing ethanol with gasoline as an alcohol mixed fuel. That is, the internal combustion engine 1 can use, as fuel, not only gasoline not mixed with ethanol but also ethanol mixed fuel in which ethanol and gasoline are mixed at an arbitrary ratio. The internal combustion engine 1 can also use ethanol that is not mixed with gasoline as a fuel.

  The internal combustion engine 1 is provided with a control device 8. A detection signal is input to the control device 8 from each sensor provided in the internal combustion engine 1. As such sensors, a water temperature sensor 9 that detects the engine water temperature of the internal combustion engine 1, an alcohol concentration sensor 10 that detects the alcohol concentration of the fuel in the fuel tank 5, and the fuel injection valve 3 are supplied to the fuel injection valve 3. A fuel temperature sensor 11 for detecting the temperature of the fuel and a shift position sensor 12 for detecting the position of the shift lever are provided. An air flow meter 13 is also provided for detecting an intake air temperature that is the temperature of air introduced into the combustion chamber 6 through the intake passage 2 and an intake air amount that is the amount of air introduced into the combustion chamber 6 through the intake passage 2. ing. The control device 8 also receives an on / off signal for the ignition switch 14. The control device 8 reads the detection signal of the fuel temperature sensor 11 and periodically stores the fuel temperature.

The control device 8 executes various controls based on the detection signals of these sensors.
Next, a flow of a series of processes executed when the control device 8 starts the internal combustion engine 1 will be described with reference to a flowchart of FIG. The control device 8 performs this series of processing when the start condition of the internal combustion engine 1 is satisfied, for example, when the ignition switch 14 is switched from OFF to ON or when the automatic start condition of the internal combustion engine 1 is satisfied. Execute.

  As shown in FIG. 2, when starting the series of processing, the control device 8 first performs heating control (step S201). In the heating control, the energization control to the heater 7 is executed to heat the fuel injection valve 3. And the control apparatus 8 measures the elapsed time Tc after starting heating control.

  Next, the process proceeds to step S202, and it is determined whether or not the elapsed time Tc from the start of the heating control has reached the execution time Td of the heating control (step S202). A method for calculating the execution time Td will be described later with reference to FIGS.

  In the process of step S202, when it is determined that the elapsed time Tc from the start of the heating control has not reached the execution time Td of the heating control (step S202: NO), the heating control is continued while the heating control is continued. Repeat the process.

  On the other hand, in the process of step S202, when it is determined that the elapsed time Tc from the start of the heating control has reached the execution time Td (step S202: YES), the process proceeds to the next process and the heater 7 is energized. Control is complete | finished and heating control is complete | finished (step S203).

  Thereafter, the process proceeds to step S204, and it is determined whether or not the shift position is the neutral position (N) or the parking position (P). When it is determined that the shift position is the neutral position (N) or the parking position (P) (S204: YES), start control is executed (step S205).

In this starting control, first, the fuel injection amount is calculated based on the temperature of the fuel, the intake air temperature, and the ethanol concentration of the fuel.
The lower the temperature of the fuel, the less likely it is to vaporize. For this reason, when the temperature of the fuel is low, it is necessary to increase the fuel injection amount when starting the internal combustion engine. Further, even when the intake air temperature is low, the fuel injected into the intake passage 2 is difficult to vaporize, so it is necessary to increase the fuel injection amount. Furthermore, the higher the ethanol concentration of the fuel, the less likely it is to vaporize. For this reason, it is necessary to increase the fuel injection amount even when the ethanol concentration of the fuel is high.

  Therefore, in this starting control, the fuel injection amount is calculated so as to increase as the temperature of the fuel is lower, as the intake air temperature is lower, and as the ethanol concentration is higher. Then, cranking is performed, and fuel corresponding to the calculated fuel injection amount is injected from the fuel injection valve 3.

  By the way, if the fuel stored in the fuel tank 5 or the fuel pipe is left for a long period of time, the volatile component in the fuel volatilizes and the fuel is difficult to vaporize. Therefore, as described above, even when the fuel injection amount is calculated based on the fuel ethanol concentration, the fuel temperature, and the intake air temperature, which correlates with the ease of vaporization of the fuel, the properties of the fuel change. If the fuel is difficult to vaporize, the engine speed may not be increased to the target speed. For this reason, in this starting control, when the engine speed does not increase to the target speed, an increase control for increasing the amount of fuel is performed to increase the engine speed to the target speed. Note that a fuel increase value Qf indicating the amount of fuel increased by the increase control when the engine is started is stored in the control device 8. The controller 8 starts the internal combustion engine by performing such start control, and ends this series of processes.

  On the other hand, if it is determined in step S204 that the shift position is not the neutral position (N) or the parking position (P) (step S204: NO), the shift position is the neutral position (N) or the parking position (P). Repeat this process until.

  As described above, in this embodiment, when the start condition of the internal combustion engine 1 is satisfied, the heating control is performed before the start control for starting the internal combustion engine is executed, and the fuel injection valve 3 is warmed by the heating control. The internal combustion engine 1 is started. For this reason, vaporization of the fuel injected from the fuel injection valve 3 is promoted, and the startability of the internal combustion engine 1 is improved.

  The internal combustion engine 1 is not started when the shift position is not the neutral position (N) or the parking position (P), and the internal combustion engine 1 is started when the shift position is the neutral position (N) or the parking position (P). Therefore, the vehicle suddenly jumps out when the internal combustion engine 1 is started.

  Next, with reference to the flowchart in FIG. 3 and the graph in FIG. 4, a flow of a series of processes related to the calculation of the heating control execution time Td will be described. This series of processing is also executed when a start condition for starting the internal combustion engine 1 is satisfied.

  As shown in FIG. 3, in this series of processes, the control device 8 firstly adds the engine water temperature and the ethanol of the fuel in addition to the stop period from when the internal combustion engine 1 stops until the start condition is satisfied. Information on the concentration, the fuel increase value Qf indicating the amount of fuel increased by the increase control when the internal combustion engine was started last time, and the fuel temperature change history during the stop period are acquired (step S301).

  In addition, during the stop period from when the internal combustion engine 1 is stopped until the start condition is satisfied, information indicating the date when the internal combustion engine 1 was stopped is read. For example, the ignition switch 14 is turned on this time after the ignition switch 14 was previously turned off. It can be obtained by calculating the period until it is given. Further, it can be obtained by calculating a period from when the automatic stop condition of the internal combustion engine 1 is satisfied to when the automatic start condition is satisfied.

And it transfers to the process of step S302 and calculates the execution time Td of heating control from the information regarding each parameter acquired at step S301.
Here, when the engine water temperature is low, the fuel is less likely to vaporize. Also, the fuel is less likely to vaporize when the alcohol concentration of the fuel is high.

  Therefore, as shown in FIG. 4, the control device 8 calculates the execution time Td so as to be longer as the engine water temperature is lower and as the fuel ethanol concentration is higher in the process of step S <b> 302. In addition, as shown in FIG. 4, the influence on the easiness of vaporization of the fuel by the difference in ethanol concentration becomes smaller as the engine water temperature is higher. For this reason, when the engine water temperature is high, the difference in the execution time Td due to the difference in ethanol concentration is reduced.

  The stop period from when the internal combustion engine 1 is stopped until the start condition is satisfied, the fuel increase value Qf, and the fuel temperature change history during the stop period are parameters that correlate with the ease of volatilization of the fuel. .

  That is, in the ethanol mixed fuel in the fuel tank 5, the longer the stop period of the internal combustion engine 1, the more easily volatile components contained in the fuel volatilize, and the fuel vaporizes when injected from the fuel injection valve 3. It becomes difficult. For this reason, referring to the length of the stop period of the internal combustion engine 1, it is possible to estimate the degree of change in the properties of the fuel during the stop period.

  In addition, when the volatile components of the alcohol-mixed fuel are volatilized and the fuel is difficult to vaporize, the difference between the engine speed at the start of the engine and the target speed increases, and the amount of fuel increased by the increase control increases. The amount increases. Therefore, the fuel increase value Qf indicating the amount of fuel increased by the increase control reflects the influence of changes in the properties of the fuel due to volatilization of easily volatile components of the ethanol mixed fuel. Therefore, by referring to the fuel increase value Qf, it is possible to estimate the ease of vaporization of the fuel when the internal combustion engine is started last time.

  Further, the fuel in the fuel tank 5 is less likely to vaporize due to the volatilization of components that tend to volatilize as the temperature increases. That is, even if the period during which the internal combustion engine 1 is stopped is the same, the change in the properties of the fuel is more likely to proceed as the temperature of the fuel increases. Therefore, by referring to the change history of the fuel temperature during the stop period, it is possible to estimate the change degree of the property of the fuel during the stop period more accurately. In this embodiment, based on the change history of the temperature of the fuel, the period during which the temperature of the fuel is equal to or higher than the predetermined temperature during the stop period of the internal combustion engine 1 is integrated. Is determined to be difficult to vaporize. Note that, as the predetermined temperature used at this time, a temperature at which a component that easily vaporizes the fuel is easily volatilized is set.

  Therefore, in the process of step S302, the control device 8 performs the heating control so that the longer the stop period of the internal combustion engine 1, the greater the fuel increase value Qf, and the longer the integration period in the stop period. An execution time Td is calculated.

  Thus, in the process of step S302, in addition to the stop period of the internal combustion engine 1, the execution time is reflected by reflecting the engine water temperature, the fuel alcohol concentration, the fuel increase value Qf, and the fuel temperature in the stop period. Td is calculated. Then, when the execution time Td is calculated, this series of processing is terminated.

Next, the operation of the control device 8 for the internal combustion engine 1 of the present embodiment will be described.
In a plug-in hybrid vehicle, a situation in which the internal combustion engine is not driven may continue for a long period of time by repeatedly performing traveling in the EV mode in which the vehicle is driven without driving the internal combustion engine and charging from an external power source. . The fuel in the fuel tank 5 is less likely to be vaporized as the internal combustion engine 1 is stopped longer.

  In this embodiment, the execution time Td is made longer as the stop period from when the internal combustion engine 1 is stopped until the start condition of the internal combustion engine 1 is satisfied is longer. As a result, even when the fuel in the fuel tank 5 is less likely to be vaporized by being left for a long period of time, the heating control is performed to reflect this effect, and the vaporization of the fuel is promoted.

  Further, since the execution time Td of the heating control is calculated by reflecting the engine water temperature and the ethanol concentration in addition to the stop period of the internal combustion engine 1, it is easy to vaporize the fuel by the engine water temperature and the ethanol concentration. Heating control is executed in consideration of the influence.

  In addition to the stop period of the internal combustion engine 1, the heating control execution time Td is calculated by reflecting the fuel increase value Qf indicating the amount of fuel increased through the increase control when the previous start control was performed. . For this reason, the characteristics of the fuel when the internal combustion engine was last started are also reflected in the execution time Td of the heating control.

  In addition to the stop period of the internal combustion engine 1, the execution time Td of the heating control is calculated based on the change history of the fuel temperature during the stop period. For this reason, the influence on the change in the property of the fuel due to the temperature during the stop period of the internal combustion engine 1 is also reflected in the execution time Td of the heating control.

According to the embodiment described above, the following effects can be obtained.
(1) The heating control execution time Td is increased as the stop period from when the internal combustion engine 1 is stopped to when the start condition of the internal combustion engine 1 is satisfied is longer. For this reason, even when the fuel in the fuel tank 5 is less likely to vaporize by being left for a long period of time, the heating control can be performed by reflecting this effect, and fuel vaporization is preferably promoted. Can be made. Therefore, even when the easily volatile component in the fuel is volatilized and the property of the fuel is changed, the startability of the internal combustion engine 1 can be prevented from deteriorating.

  (2) In addition to the stop period of the internal combustion engine 1, the execution time Td of the heating control was calculated by reflecting the engine water temperature and the ethanol concentration of the fuel. For this reason, the heating control can be executed in consideration of the influence of the easiness of vaporization of the fuel due to the engine water temperature and the ethanol concentration, and the vaporization of the fuel can be promoted more suitably.

  (3) The heating control execution time Td is calculated by reflecting the fuel increase value Qf in addition to the stop period of the internal combustion engine 1. For this reason, the characteristic of the fuel when the internal combustion engine 1 was started last time can be reflected in the execution time Td of the heating control.

  (4) In addition to the stop period of the internal combustion engine 1, the execution time Td of the heating control is calculated based on the change history of the fuel temperature during the stop period. For this reason, the influence on the change in the property of the fuel due to the temperature during the stop period of the internal combustion engine 1 can also be reflected in the execution time Td of the heating control.

In addition, the said embodiment can be changed and implemented as follows.
In the above embodiment, the fuel temperature sensor 11 is provided in the fuel injection valve 3, but the fuel temperature sensor 11 may be provided in the fuel supply passage 4 and the fuel tank 5.

  In the above embodiment, the change history of the fuel temperature is stored, and the longer the integration period, which is a period obtained by integrating the period in which the temperature of the fuel is equal to or higher than the predetermined temperature in the stop period of the internal combustion engine 1, is longer. Although the execution time Td of the heating control is calculated, the mode of reflecting the fuel temperature in the execution time Td of the heating control is not limited to this. For example, the average temperature of the fuel during the stop period of the internal combustion engine 1 may be calculated, and the execution time Td may be calculated so as to increase as the average temperature increases.

  -The engine water temperature used when calculating the execution time Td of heating control is not restricted to the engine water temperature when performing the process of step S301. For example, the engine water temperature when the start condition of the internal combustion engine 1 is satisfied, such as when the ignition switch 14 is switched from OFF to ON or when the automatic start condition is satisfied, may be used. Further, the engine water temperature at the time of fuel injection in the start control may be estimated, and the estimated engine water temperature may be used.

In the process of step S302, the execution time Td of the heating control may be calculated by reflecting only the temperature of the fuel in the stop period and the stop period of the internal combustion engine 1.
In the processing of step S302, the execution time Td of the heating control may be calculated without reflecting the fuel temperature during the stop period of the internal combustion engine 1. That is, in addition to the stop period of the internal combustion engine 1, the execution time Td of the heating control may be calculated by reflecting only the engine water temperature, the ethanol concentration, and the fuel increase value Qf. In addition to the above parameters, the heating control execution time Td may be calculated using another parameter different from the fuel temperature. Even with such a configuration, the effects (1) to (3) can be obtained.

In the process of step S302, the execution time Td of the heating control may be calculated by reflecting only the stop period of the internal combustion engine 1 and the fuel increase value Qf.
In the process of step S302, the heating control execution time Td may be calculated without reflecting the fuel increase value Qf. That is, in addition to the stop period of the internal combustion engine 1, the execution time Td of the heating control may be calculated based only on the engine water temperature and the ethanol concentration. In addition to the above parameters, the heating control execution time Td may be calculated using another parameter different from the fuel increase value Qf. Even with such a configuration, the effects (1) and (2) can be obtained.

  In the process of step S302, the execution time Td of the heating control may be calculated without reflecting the engine water temperature. That is, the execution time Td of the heating control may be calculated by reflecting only the stop period of the internal combustion engine 1 and the ethanol concentration. In addition to the above parameters, the heating control execution time Td may be calculated using another parameter different from the engine water temperature. Even with such a configuration, the effect (1) can be obtained.

  In the process of step S302, the heating control execution time Td may be calculated without reflecting the ethanol concentration. That is, the execution time Td of the heating control may be calculated by reflecting only the stop period of the internal combustion engine 1 and the engine water temperature. In addition to the above parameters, the heating control execution time Td may be calculated using another parameter different from the ethanol concentration. Even with such a configuration, the effect (1) can be obtained.

  In the process of step S302, only the stop period of the internal combustion engine 1 may be reflected to calculate the heating control execution time Td. In such a configuration, the heating control execution time Td may be calculated such that the longer the stop period of the internal combustion engine 1 is, the longer it is.

-The process of step S204 can be omitted.
In the above embodiment, the plug-in hybrid vehicle is exemplified as the vehicle on which the internal combustion engine 1 that is the control target of the control device 8 is mounted. However, the control mode shown in the above embodiment is applicable to vehicles other than the plug-in hybrid vehicle. Can be applied. Even in the case of a vehicle other than the plug-in hybrid vehicle, the same effect as the above (1) can be obtained by applying the same control as in the present embodiment when a situation in which the internal combustion engine 1 is stopped for a long period of time has occurred. Can be obtained.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Intake passage, 3 ... Fuel injection valve, 4 ... Fuel supply passage, 5 ... Fuel tank, 6 ... Combustion chamber, 7 ... Heater, 8 ... Control apparatus, 9 ... Water temperature sensor, 10 ... Alcohol concentration Sensor: 11 ... Fuel temperature sensor, 12 ... Shift position sensor, 13 ... Air flow meter, 14 ... Ignition switch.

Claims (4)

An internal combustion engine control apparatus that controls an internal combustion engine capable of using alcohol-mixed fuel and performs heating control to heat a fuel injection valve before starting the internal combustion engine when a start condition for starting the internal combustion engine is satisfied. There,
The control device for an internal combustion engine, which increases the execution time of the heating control as the stop period from when the internal combustion engine stops until the start condition is satisfied is longer. The control apparatus for an internal combustion engine according to claim 1, wherein the execution time is calculated by reflecting an engine water temperature and a fuel alcohol concentration in addition to the stop period. When starting the internal combustion engine, an amount of fuel calculated based on the alcohol concentration of the fuel, the temperature of the fuel, and the intake air temperature is injected, and when the engine speed does not reach the target speed, the engine speed is A control device for an internal combustion engine that executes an increase control for increasing a fuel injection amount so as to match a target rotational speed,
The control device for an internal combustion engine according to claim 1 or 2, wherein, in addition to the stop period, the execution time is calculated by reflecting the amount of fuel increased by the increase control when the internal combustion engine was started last time. The control device for an internal combustion engine according to any one of claims 1 to 3, wherein the execution time is calculated by reflecting the temperature of the fuel in the stop period in addition to the stop period.