Control device for internal combustion engine

Abstract

To provide a control device for an internal combustion engine capable of executing determination processing when an effect on vehicle traveling is small.SOLUTION: A control device is a control device for an internal combustion engine mounted on a vehicle. The internal combustion engine includes a fuel tank, a fuel injection valve, a fuel passage, a shutoff valve, and a pressure sensor for detecting passage fuel pressure that is pressure at a portion between the shutoff valve and the fuel injection valve in the fuel passage. The control device outputs a valve closing signal to the shutoff valve and executes determination processing for determining opening fixation of the shutoff valve on the basis of a reduction amount of the passage fuel pressure when the internal combustion engine is in an idling operation state.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a control device for an internal combustion engine. [Background technology]

[0002] Internal combustion engines that use gaseous fuel are known. A shutoff valve is arranged in a fuel passage of such an internal combustion engine. When the internal combustion engine is stopped, the shutoff valve closes, thereby stopping the supply of fuel from the fuel tank to the fuel injection valve. Patent Document 1 discloses a vehicle equipped with such an internal combustion engine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-041106 Summary of the Invention [Problem to be solved by the invention]

[0004] One method for determining whether a shutoff valve is stuck open is to determine from a change in the fuel pressure in the fuel passage between the shutoff valve and the fuel injection valve (hereinafter referred to as "passage fuel pressure") after a valve close command is output to the shutoff valve during fuel injection. If the shutoff valve is closed, the fuel in the fuel passage decreases as fuel injection is performed, and the passage fuel pressure drops. If the shutoff valve is stuck open, fuel continues to be supplied from the fuel tank to the fuel injection valve, so the passage fuel pressure is unlikely to drop even when fuel injection is performed. Therefore, it can be determined that the shutoff valve is stuck open based on a small drop in the passage fuel pressure.

[0005] The above-described determination method involves closing the shutoff valve, which limits the amount of fuel supplied to the internal combustion engine, and this may affect the running of the vehicle. [Means for solving the problem]

[0006] A control device for an internal combustion engine that solves the above problem is a control device for an internal combustion engine mounted on a vehicle. The internal combustion engine includes a fuel tank that stores gaseous fuel, a fuel injection valve that supplies the fuel into a cylinder, a fuel passage connecting the fuel tank and the fuel injection valve, a shutoff valve disposed in the fuel passage, and a pressure sensor disposed in a portion of the fuel passage between the shutoff valve and the fuel injection valve to detect a passage fuel pressure that is the pressure of the fuel in that portion. The control device outputs a valve close signal to the shutoff valve, and, when the internal combustion engine is in an idle operating state, executes a determination process to determine whether the shutoff valve is stuck open based on an amount of decrease in the passage fuel pressure that occurs during a period from the output of the valve close signal until a predetermined period has elapsed. [Effects of the Invention]

[0007] The above-described control device for an internal combustion engine can execute the determination process when there is little effect on the running of the vehicle. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an internal combustion engine and a control device for the internal combustion engine according to an embodiment. [Figure 2] FIG. 2 is a flowchart illustrating a procedure of a determination process executed by the control device according to an embodiment. [Figure 3] FIG. 3 is a timing chart showing the transition of states when a determination process is executed in an internal combustion engine to which a control device of one embodiment is applied, and shows the transition of (a) accelerator opening, (b) engine rotation speed, (c) vehicle speed, (d) ignition switch state, (e) idle determination state, (f) stop determination state, (g) prerequisite state, (h) shut-off valve state, (i) passage fuel pressure state, and (j) determination state. DETAILED DESCRIPTION OF THE INVENTION

[0009] <Embodiment> An embodiment of a control device for an internal combustion engine will be described below with reference to FIGS. 1 to 3. FIG. <Configuration of Internal Combustion Engine and Control Device for Internal Combustion Engine> 1 is mounted on a vehicle. The fuel for the internal combustion engine 10 is gaseous fuel. An example of the gaseous fuel is hydrogen gas.

[0010] The internal combustion engine 10 includes an engine body 11. The engine body 11 generates power for propelling a vehicle by combusting fuel injected from fuel injection valves 13 inside each cylinder. In Fig. 1, illustrations of cylinders, spark plugs, etc. are omitted.

[0011] The internal combustion engine 10 includes a fuel tank 12, a fuel injection valve 13, a fuel passage 14, a shutoff valve 15, and a pressure sensor 16. The fuel tank 12 stores gaseous fuel. The gaseous fuel is stored in the fuel tank 12 in a compressed state. The gaseous fuel is supplied from the fuel tank 12 to the fuel injection valve 13. The fuel injection valve 13 supplies fuel into a cylinder.

[0012] Fuel passage 14 connects fuel tank 12 and fuel injection valve 13. Fuel passage 14 is composed of fuel piping 17 connected to fuel tank 12 and delivery pipe 18 connecting fuel piping 17 and fuel injection valve 13. Fuel stored in fuel tank 12 is supplied to fuel injection valve 13 via fuel piping 17 and delivery pipe 18.

[0013] The shutoff valve 15 is disposed in the fuel passage 14. The shutoff valve 15 is, for example, a solenoid valve. The shutoff valve 15 is switched between an open state and a closed state by the control device 100. The shutoff valve 15 enters an open state when it receives a valve open command from the control device 100. The shutoff valve 15 enters a closed state when it receives a valve close command from the control device 100. Specifically, when the control device 100 inputs a valve open command to a drive circuit of the shutoff valve 15, the drive circuit supplies power to the shutoff valve 15. As a result, the shutoff valve 15 enters an open state. When the control device 100 inputs a valve close command to a drive circuit of the shutoff valve 15, the drive circuit stops supplying power to the shutoff valve 15. As a result, the shutoff valve 15 enters a closed state. The shutoff valve 15 is maintained in an open state while the internal combustion engine 10 is operating. The shutoff valve 15 is maintained in a closed state while the internal combustion engine 10 is stopped. The shutoff valve 15 includes a first shutoff valve 19 and a second shutoff valve 20 .

[0014] The first shutoff valve 19 is disposed in the fuel passage 14 near the outlet of the fuel tank 12. The first shutoff valve 19 is disposed at the end of the fuel pipe 17 on the fuel tank 12 side. When the first shutoff valve 19 is in an open state, fuel is supplied from the fuel tank 12 to the fuel pipe 17. When the first shutoff valve 19 is in a closed state, fuel supply from the fuel tank 12 to the fuel pipe 17 is stopped.

[0015] The second shutoff valve 20 is disposed downstream of the first shutoff valve 19 in the fuel passage 14. The second shutoff valve 20 is disposed near the delivery pipe 18. The second shutoff valve 20 is disposed between the fuel pipe 17 and the delivery pipe 18. When the second shutoff valve 20 is in an open state, fuel is supplied from the fuel pipe 17 to the delivery pipe 18. When the second shutoff valve 20 is in a closed state, fuel supply from the fuel pipe 17 to the delivery pipe 18 is stopped.

[0016] A pressure reducing valve 21 is disposed in the fuel passage 14 between the first shutoff valve 19 and the second shutoff valve 20. The pressure reducing valve 21 adjusts the pressure of the fuel flowing into the delivery pipe 18 from the high-pressure fuel tank 12.

[0017] The pressure sensor 16 is disposed in a portion of the fuel passage 14 between the shutoff valve 15 and the fuel injection valve 13. The pressure sensor 16 detects the passage fuel pressure, which is the pressure of the fuel in the portion between the shutoff valve 15 and the fuel injection valve 13. The pressure sensor 16 outputs a detection signal relating to the detected passage fuel pressure to the control device 100.

[0018] The pressure sensor 16 includes a first pressure sensor 23 and a second pressure sensor 24. The first pressure sensor 23 is disposed in the fuel passage 14 between the first shutoff valve 19 and the fuel injection valve 13. The first pressure sensor 23 is disposed in the fuel passage 14 between the first shutoff valve 19 and the second shutoff valve 20. The first pressure sensor 23 detects a first passage fuel pressure that indicates the passage fuel pressure between the first shutoff valve 19 and the fuel injection valve 13. The second pressure sensor 24 is disposed between the second shutoff valve 20 and the fuel injection valve 13. The second pressure sensor 24 detects a second passage fuel pressure that indicates the passage fuel pressure between the second shutoff valve 20 and the fuel injection valve 13.

[0019] The internal combustion engine 10 is equipped with a temperature sensor 25. The temperature sensor 25 is disposed in a portion of the fuel passage 14 between the shutoff valve 15 and the fuel injection valve 13. The temperature sensor 25 detects the passage fuel temperature, which is the temperature of the fuel in the portion between the shutoff valve 15 and the fuel injection valve 13. The temperature sensor 25 outputs a detection signal related to the detected passage fuel temperature to the control device 100.

[0020] The temperature sensors 25 include a first temperature sensor 26 and a second temperature sensor 27. The first temperature sensor 26 is disposed between the first shutoff valve 19 and the fuel injector 13. The first temperature sensor 26 is disposed between the first shutoff valve 19 and the second shutoff valve 20. The second temperature sensor 27 is disposed between the second shutoff valve 20 and the fuel injector 13.

[0021] The control device 100 performs various controls of the internal combustion engine 10 by controlling various control objects such as the fuel injection valve 13, the first shutoff valve 19, the second shutoff valve 20, and the pressure reducing valve 21. For example, the control device 100 drives the shutoff valve 15 to open by sending a valve open signal to the shutoff valve 15, and drives the shutoff valve 15 to close by sending a valve close signal to the shutoff valve 15.

[0022] The control device 100 includes a CPU 110 and a memory 120 configured from a ROM, a RAM, etc. The CPU 110 executes a program stored in the memory 120, whereby the control device 100 performs various controls.

[0023] The control device 100 acquires various values ​​necessary for controlling the internal combustion engine 10. For example, the control device 100 acquires detection signals from the pressure sensor 16 and the temperature sensor 25. The control device 100 also acquires detection signals from various other sensors, such as an accelerator opening sensor 200, a vehicle speed sensor 300, and an ignition sensor 400. The accelerator opening sensor 200 detects the accelerator opening, which is the amount of operation of the accelerator pedal operated by the user of the vehicle equipped with the internal combustion engine 10. The vehicle speed sensor 300 detects the vehicle speed of the vehicle equipped with the internal combustion engine 10. The control device 100 acquires detection signals from the internal combustion engine 10 for calculating the engine rotation speed of the internal combustion engine 10, a detection signal of the intake air amount, and the like.

[0024] <About the judgment process> The control device 100 outputs a valve closing signal to the shutoff valve 15 and determines whether the shutoff valve 15 is stuck open based on the amount of decrease in passage fuel pressure that occurs during the period from when the valve closing signal was output until a predetermined period has elapsed. During the determination process, the fuel injection valve 13 performs fuel injection. During the determination process, fuel is continuously supplied into the cylinder from the fuel injection valve 13. The control device 100 stores in the memory 120 a determination result indicating that the shutoff valve 15 is stuck open if the amount of decrease in passage fuel pressure that occurs during the period from when the valve closing signal was output until the predetermined period has elapsed is smaller than a predetermined threshold. The predetermined threshold is set, for example, based on the amount of fuel consumed during idling of the internal combustion engine 10. The amount of fuel consumed during idling of the internal combustion engine 10 is calculated based on the number of fuel injections performed during idling, the injection time, and the passage fuel temperature.

[0025] The control device 100 may set the predetermined threshold value according to the passage fuel pressure, the passage fuel temperature, etc. at the start of the determination process. The control device 100 sets a larger predetermined threshold value as the passage fuel temperature at the start of the determination process is higher.

[0026] The determination process includes a first determination process for determining whether the first shutoff valve 19 is stuck open, and a second determination process for determining whether the second shutoff valve 20 is stuck open. The first determination process will now be described. During the execution of the first determination process, the second shutoff valve 20 is in an open state.

[0027] When the first shutoff valve 19 is in a closed state, the supply of fuel from the fuel tank 12 to the fuel passage 14 is stopped. Fuel is supplied from the fuel injection valve 13 into the cylinder when the fuel is injected from the fuel injection valve 13, but the supply of fuel from the fuel tank 12 to the fuel passage 14 is stopped, so the first passage fuel pressure drops. On the other hand, when the first shutoff valve 19 is stuck open, fuel continues to be supplied from the fuel tank 12 to the fuel passage 14, so the first passage fuel pressure does not drop, or the amount of drop in the first passage fuel pressure is smaller than when the first shutoff valve 19 is in a closed state. For this reason, it can be determined that the first shutoff valve 19 is stuck open based on the amount of drop in the first passage fuel pressure.

[0028] The second determination process will now be described. During the execution of the second determination process, the first shutoff valve 19 is preferably in a closed state. When second shutoff valve 20 is in the closed state, fuel supply from fuel pipe 17 to delivery pipe 18 is stopped. Fuel is supplied into the cylinders from fuel injection valve 13 when fuel is injected from fuel injection valve 13, but the second passage fuel pressure drops because the fuel supply from fuel pipe 17 to delivery pipe 18 is stopped. On the other hand, when second shutoff valve 20 is stuck open, fuel continues to be supplied from fuel pipe 17 to delivery pipe 18, so the second passage fuel pressure does not drop, or the drop in the second passage fuel pressure is smaller than when second shutoff valve 20 is in the closed state. Therefore, it can be determined that second shutoff valve 20 is stuck open based on the drop in the second passage fuel pressure.

[0029] <Timing when the judgment process is executed> The control device 100 executes the determination process when the internal combustion engine 10 is in an idle operating state. The idle operating state of the internal combustion engine 10 can be determined based on the accelerator opening and the engine speed. The control device 100 determines that the internal combustion engine 10 is in an idle operating state when the accelerator opening is zero and the engine speed of the internal combustion engine 10 reaches an idle speed, which is the rotational speed of the internal combustion engine 10 during idle operation. Note that "when the engine speed of the internal combustion engine 10 reaches the idle speed" refers to when the engine speed of the internal combustion engine 10 is equal to or less than a predetermined upper speed limit and equal to or greater than a predetermined lower speed limit. The predetermined upper speed limit and the predetermined lower speed limit are set according to the range of fluctuation in the engine speed during idle operation of the internal combustion engine 10. "When the engine speed of the internal combustion engine 10 reaches the idle speed" may also include when the engine speed drops to the idle speed if the accelerator pedal is not operated while the accelerator opening is zero.

[0030] More preferably, the control device 100 executes the determination process when the vehicle is stopped and the internal combustion engine 10 is in an idling state. Whether the vehicle is stopped or not is determined from the vehicle speed.

[0031] The control device 100 ends the determination process when the idling state of the internal combustion engine 10 ends if the elapsed time is less than a specified time after the start of the determination process. Alternatively, the control device 100 ends the determination process when the vehicle starts traveling if the elapsed time of the determination process is less than a specified time after the start of the determination process.

[0032] When a stop operation of the internal combustion engine 10 is executed, the control device 100 stops the internal combustion engine 10 without executing the determination process. <Determination process flow> FIG. 2 shows a series of processing flows related to the determination processing executed by the control device 100. The control device 100 repeatedly executes the processing of FIG. 2. Both the first determination processing and the second determination processing are executed according to the processing procedure shown in FIG. 2. Below, the processing procedure when the first determination processing is executed as the determination processing according to the processing procedure shown in FIG. 2 will be described. In the following processing, the shutoff valve 15 is the first shutoff valve 19.

[0033] The control device 100 determines whether or not a precondition is met (S100). The precondition is a condition for determining the timing at which the determination process is executed. Examples of the precondition include the following conditions.

[0034] · The ignition switch is on. The internal combustion engine 10 is in an idle operating state. The vehicle is stopped.

[0035] The control device 100 determines that the preconditions are met when all of the above conditions are met. The control device 100 determines that the internal combustion engine 10 is in an idle operating state when the accelerator opening is 0 and the engine speed of the internal combustion engine 10 is equal to the idle speed. The control device 100 determines whether the vehicle is stopped based on the vehicle speed. Other conditions that may be added to the preconditions include that various sensors are functioning normally, and that the determination process has never been executed since the internal combustion engine 10 stopped operating and then resumed operating.

[0036] If the precondition is met (S100: YES), the control device 100 outputs a valve close command to the shutoff valve 15, acquires the passage fuel pressure (S110), and proceeds to the processing of S120. If the precondition is not met (S100: NO), the control device 100 ends the processing of FIG.

[0037] The control device 100 determines whether the preconditions are still met (S120). The control device 100 continues to determine whether the preconditions are still met from S100. If the preconditions are met (S120: YES), the control device 100 proceeds to S130. If the preconditions are not met (S120: NO), the control device 100 proceeds to the processing of S180.

[0038] The control device 100 determines whether a specified period has elapsed (S130). If the elapsed period since the control device 100 outputted a valve close command to the shutoff valve 15 in S110 is equal to or greater than the specified period, the control device 100 determines that the specified period has elapsed. The control device 100 has a timer function for measuring the elapsed period. If the specified period has elapsed (S130: YES), the control device 100 proceeds to processing of S140. If the specified period has not elapsed (S130: NO), the control device 100 repeats the processing from S120.

[0039] The control device 100 acquires the passage fuel pressure (S140) and determines whether the amount of decrease in the passage fuel pressure is equal to or greater than a predetermined threshold (S150). The amount of decrease in the passage fuel pressure is the difference between the passage fuel pressure acquired in S110 and the passage fuel pressure acquired in S140. If the amount of decrease in the passage fuel pressure is equal to or greater than the predetermined threshold (S150: YES), the control device 100 stores in the memory 120 a determination result indicating that the shutoff valve 15 is normal and not stuck open (S160), and proceeds to the processing of S180. If the amount of decrease in the passage fuel pressure is not equal to or greater than the predetermined threshold (S150: NO), the control device 100 stores in the memory 120 a determination result indicating that the shutoff valve 15 is abnormal and stuck open (S170), and proceeds to the processing of S180.

[0040] The control device 100 outputs a valve open command to the shutoff valve 15 (S180) and ends the processing of FIG. 2. The control device 100 may output the determination result of whether the shutoff valve 15 is stuck open to a user of the vehicle or the like. The output of the valve open command to the shutoff valve 15 may be executed after the passage fuel pressure after the lapse of a specified period is obtained. For example, the control device 100 may output the valve open command to the shutoff valve 15 after executing the processing of S140 and before executing the processing of S150. In this case, the control device 100 outputs the valve open command to the shutoff valve 15 even when the precondition is not met in the processing of S120 (S120: NO).

[0041] After the first determination process is executed as the series of processes in Fig. 2, the second determination process is executed in accordance with the series of processes in Fig. 2. When the second determination process is executed following the first determination process, the process of S180 is omitted from the series of processes in Fig. 2 in the first determination process. In the second determination process, after storing the presence or absence of the shutoff valve 15 stuck open in memory 120 (steps S160, S170), the control device 100 outputs a valve open command to the first shutoff valve 19 and the second shutoff valve 20 (S180).

[0042] <About the judgment process> The transitions of the accelerator opening, engine rotation speed, passage fuel pressure, etc. when the determination process is executed will be described with reference to Fig. 3. Fig. 3 shows an example in which a traveling vehicle stops.

[0043] When the user releases the accelerator pedal to stop the vehicle, as shown in FIG. 3(a), the accelerator opening decreases and reaches 0 at time t11. As shown in FIG. 3(b), as the accelerator opening decreases, the engine speed of the internal combustion engine 10 also decreases. At time t12, the engine speed reaches a predetermined upper limit speed for the idle speed indicated by M1 in FIG. 3(b). As shown in FIG. 3(c), the vehicle speed also decreases from time t11 and reaches 0 km / h at time t13 due to a braking operation by the vehicle user. As shown in FIG. 3(d), the ignition switch remains on.

[0044] As shown in Fig. 3(e), the control device 100 determines that the internal combustion engine 10 is in an idle operating state when the accelerator opening is 0 and the engine rotation speed is the idle rotation speed, that is, at time t12. As shown in Fig. 3(f), the control device 100 determines that the vehicle is in a stopped state at time t13 because the vehicle speed is 0 km / h.

[0045] As shown in Fig. 3(g), at time t13, the ignition switch is on, the internal combustion engine 10 is in an idling state, and the vehicle is stopped, so that the preconditions are met. The control device 100 outputs a valve closing command to the shutoff valve 15, so that the shutoff valve 15 is closed as shown in Fig. 3(h).

[0046] Time t14 is the time when a specified period has elapsed since time t13. In Figure 3(i), the solid line shows the change in passage fuel pressure when shutoff valve 15 is not stuck open, and the dashed-dotted line shows the change in passage fuel pressure when shutoff valve 15 is stuck open. When shutoff valve 15 is not stuck open, the passage fuel pressure continues to decrease until time t14. When shutoff valve 15 is stuck open, the passage fuel pressure does not decrease, or the decrease is smaller than when shutoff valve 15 is not stuck open.

[0047] 3(j), the control device 100 determines whether the stuck open state is normal or abnormal based on the amount of decrease in the passage fuel pressure at time t14. The control device 100 also outputs a valve open command to the shutoff valve 15.

[0048] <Actions and Effects of This Embodiment> (1) Because the determination process involves driving the shutoff valve 15 to close, the fuel supplied to the internal combustion engine 10 is restricted while the determination process is being performed. Restricting the fuel supplied to the internal combustion engine 10 may affect vehicle operation. For example, if the engine speed of the internal combustion engine 10 is higher than the idle speed, the amount of fuel between the shutoff valve 15 and the fuel injection valve 13 may drop suddenly when the determination process is performed, which may cause the internal combustion engine 10 to stop. The control device 100 described above performs the determination process when the internal combustion engine 10 is in an idle operating state. By performing the determination process when the internal combustion engine 10 is in an idle operating state, it is possible to avoid an unintended stop of the internal combustion engine 10. In this way, the control device 100 can perform the determination process when there is little impact on vehicle operation.

[0049] (2) When the vehicle is stopped by the user's braking operation, the internal combustion engine 10 transitions to an idle operating state before the vehicle stops. The likelihood of the accelerator pedal being depressed immediately after the vehicle stops is lower than the likelihood of the accelerator pedal being depressed immediately after the internal combustion engine 10 transitions to an idle operating state while the vehicle is running. Because the passage fuel pressure decreases while the determination process is being executed, if the accelerator pedal is depressed while the determination process is being executed, the amount of fuel required to accelerate the vehicle may not be injected, which may result in a deterioration in acceleration. Because the control device 100 starts the determination process when the vehicle stops, there is a high possibility that the determination process will be completed before the accelerator pedal is depressed. Therefore, the deterioration in acceleration of the vehicle as described above can be suppressed.

[0050] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0051] The internal combustion engine 10 may be configured to have only one of the first shutoff valve 19 and the second shutoff valve 20 as the shutoff valve. When the control device 100 executes the determination process, only one of the first determination process and the second determination process may be executed as the determination process.

[0052] The control device 100 may execute the determination process while the vehicle is running if the internal combustion engine 10 is in an idling state. For example, the determination process can be started early by executing the determination process between the time the user applies the brakes and the time the vehicle comes to a complete stop.

[0053] When the engine speed of the internal combustion engine 10 is the idle speed, the control device 100 may determine that the internal combustion engine 10 is in an idle operating state regardless of the accelerator opening. The control device 100 may execute the determination process when the internal combustion engine 10 is stopped, in addition to when the internal combustion engine 10 is in an idling state. [Explanation of symbols]

[0054] 10...Internal combustion engine 11...Engine body 12...Fuel tank 13...Fuel injection valve 14…Fuel passage 15...Shut-off valve 16...Pressure sensor 17…Fuel piping 18...Delivery pipe 19...First shutoff valve 20...Second shutoff valve 21...Reducing valve 23...First pressure sensor 24...Second pressure sensor 25...Temperature sensor 26...First temperature sensor 27...Second temperature sensor 100...Control device 110...CPU 120...Memory 200...Accelerator opening sensor 300...Vehicle speed sensor 400...Ignition sensor

Claims

1. A control device for an internal combustion engine mounted on a vehicle, The internal combustion engine includes: a fuel tank for storing gaseous fuel; a fuel injection valve that supplies the fuel into a cylinder; a fuel passage connecting the fuel tank and the fuel injection valve; a shutoff valve disposed in the fuel passage; a pressure sensor disposed in a portion of the fuel passage between the shutoff valve and the fuel injection valve, for detecting a passage fuel pressure that is the pressure of the fuel in that portion, The control device outputs a valve closing signal to the shutoff valve, and executes a determination process, when the internal combustion engine is in an idling state, to determine whether the shutoff valve is stuck open based on an amount of decrease in the passage fuel pressure that occurs during a period of time that has elapsed since the output of the valve closing signal until the period of time reaches a predetermined specified period. Control device for internal combustion engines.

2. The control device executes the determination process when the vehicle is stopped and the internal combustion engine is in an idling state. The control device for an internal combustion engine according to claim 1.

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