JP4609551B2 - Engine abnormality judgment device for construction machinery - Google Patents

Description

  The present invention relates to an engine abnormality determination device for a construction machine.

  2. Description of the Related Art Conventionally, there is known a common rail type fuel injection device that stores fuel pumped from a fuel pump in a high pressure state in a common rail and supplies the high pressure fuel to a fuel injection valve provided in each cylinder of a diesel engine. (For example, refer to Patent Documents 1 and 2).

  In the fuel injection devices described in Patent Documents 1 and 2, a pressure sensor for detecting the fuel pressure in the common rail is provided, and the fuel pumping amount from the fuel supply pump is controlled based on the detected fuel pressure. The fuel injection amount and the fuel injection timing are each controlled by controlling the opening and closing timing of the fuel injection valve. As a result, fuel injection control can be performed with higher accuracy than a general fuel injection device including a fuel injection pump and a nozzle.

  However, if it is detected that there is an abnormality in the fuel supply system from the fuel supply pump to the fuel injection valve, such as an internal damage or crack in the fuel injection valve, a fuel leak will occur and the common rail will There is a risk that the fuel pressure will decrease.

  In order to solve such a problem, Patent Document 1 calculates a fuel pressure change in the common rail detected during a predetermined determination period, and determines a fuel leak from the fuel supply system based on the fuel pressure change. Thus, a technology that can accurately detect a fuel leak even during operation of the diesel engine is disclosed.

In Patent Document 2, the fuel pressure at the time of driving the fuel supply pump is detected, the fuel pressure is detected when a predetermined time or more has elapsed after the fuel supply pump is stopped, and the difference becomes a predetermined value or more. Then, a technique is disclosed in which it is determined that there is a fuel leak and an alarm lamp is turned on.
Japanese Patent No. 3345933 JP-A-4-350358

  However, in the construction machine equipped with the engine described in Patent Documents 1 and 2, when the engine is stopped by the engine key switch, power is supplied to electrical components including an alarm device such as an alarm lamp in conjunction with the engine stop operation. Are shut off at the same time, or after a predetermined time has elapsed, even if an alarm lamp is activated after detecting a fuel leak after the engine has stopped, May be blocked and will not operate, or the warning lamp may be lit for too short time and the operator may not be aware of it and leave the construction machine.

  The present invention has been made in view of such a point, and an object of the present invention is to enable an operator to appropriately perform an alarm operation even when occurrence of a fuel leak is detected after the engine is stopped. is there.

  In order to achieve the above-described object, the present invention detects the fuel pressure after the engine is stopped and delays the power cut-off time for the alarm means when it is determined that a fuel leak has occurred in the engine. The alarm action can now be performed reliably.

Specifically, the present invention includes an engine provided with a common rail that stores fuel in a high-pressure state, a power supply unit that supplies power to a plurality of electrical components, and starts and stops the engine and from the power supply unit. The following solution was taken for an engine abnormality determination device for a construction machine provided with switching means for starting or shutting off power supply to the electrical component.

That is, the invention of claim 1 is a delay means for delaying an initially set power cutoff time from when the engine is stopped by the switching means until the power supply to the electrical component is cut off,
Fuel pressure detecting means for detecting the fuel pressure in the common rail;
Alarm means that constitutes at least one of the plurality of electrical components and performs a predetermined alarm operation for an operator;
After the engine is stopped by the switching means, the initial while set power interruption time to interrupt power supply to the electrical equipment when the elapsed, the detected fuel pressure in said fuel pressure detecting means life該初When the pressure drops below a predetermined pressure at a predetermined time within the set power cut-off time, it is determined that a fuel leak has occurred in the engine, and the initially set power cut-off time is determined by the delay means. with delays Risho constant set time only, until reconfigured power interruption time has elapsed, it is characterized in that a control means for controlling to actuate the alarm means.

According to the first aspect of the present invention, when the fuel pressure detected by the fuel pressure detecting means is reduced to a predetermined pressure or less by the control means within a predetermined time within the power cut-off time, a fuel leak occurs in the engine To be judged. At this time, the initially set power cut-off time is delayed by a predetermined set time by the delay means . The alarm means is controlled to perform an alarm operation until the reset power cutoff time elapses.

With such a configuration, when it is determined that a fuel leak has occurred within the power cut-off time after the engine is stopped, the initially set power cut-off time is delayed by a predetermined set time. Thus, it is possible to secure a sufficiently long time for the alarm means to perform the alarm operation.

  Specifically, after the operator stops the engine and the alarm means is activated after it is determined that a fuel leak has occurred within the power interruption time, the alarm means may be activated depending on the time setting of the power interruption time. Problems such as time being too short or no operation may occur, and the operator may leave the driver's seat and miss the alarm operation by the alarm means.

On the other hand, in the present invention, when it is determined that a fuel leak has occurred, the power cutoff time that has been initially set is delayed by a predetermined set time, so that the operation time of the alarm means is sufficiently long. This can reduce the possibility that the operator misses the alarm operation.

The invention of claim 2 is the invention according to claim 1,
When the control means determines that a fuel leak has occurred in the engine, the control means cuts off power supply to the electrical components except for the warning means when the initially set power cutoff time has elapsed. The alarm means is operated until the power cutoff time reset by the delay means elapses .

In the invention of claim 2, when it is determined that a fuel leak has occurred, the control means shuts off the power supply to the electrical components except the alarm means when the initially set power cutoff time has elapsed. On the other hand, the alarm means is activated until the power cutoff time reset by the delay means elapses.

With such a configuration, when it is determined that a fuel leak has occurred within the power cut-off time after the engine is stopped , the warning means is used until the reset power cut-off time elapses. By actuating, it is possible to ensure a sufficiently long time for the alarm means to perform the alarm operation.

Here, the power supply to the direct needs no electrical component alarm operation, with the initial set power interruption time is interrupted after a lapse, so that the continued power only to the alarm means is supplied. In this way, by not supplying power to electrical components that are not directly required for the alarm operation after the initial power cut-off time has elapsed, power saving can be achieved for the entire apparatus.

The invention of claim 3 is the invention according to claim 1 or 2,
Storage means for storing engine abnormality information indicating the occurrence of fuel leak when the control means determines that a fuel leak has occurred in the engine;
The control means determines whether or not the engine abnormality information is stored in the storage means when the engine is started by the switching means, and if the engine abnormality information is stored, the control means It is comprised so that it may act | operate, It is characterized by the above-mentioned.

  In the invention of claim 3, when it is determined that a fuel leak has occurred, engine abnormality information indicating the occurrence of the fuel leak is stored in the storage means. When the engine is started by the switching means, it is determined by the control means whether engine abnormality information is stored in the storage means. The alarm means is controlled to perform an alarm operation when engine abnormality information is stored.

  With such a configuration, it is possible to warn the operator of the occurrence of fuel leak by determining the presence or absence of engine abnormality information when starting the engine. Here, even if the operator misses the alarm operation after the engine is stopped and does not notice the occurrence of the fuel leak, the alarm operation is performed when the engine is started based on the engine abnormality information stored when the engine is stopped. Thus, the operator can reliably recognize the occurrence of fuel leak before starting work.

According to the present invention, when it is determined that a fuel leak has occurred within the power cutoff time after the engine is stopped, the initially set power cutoff time is delayed by a predetermined set time, It is possible to ensure a sufficiently long time for the alarm means to perform the alarm operation.

  That is, after the operator stops the engine and the alarm means is activated after it is determined that a fuel leak has occurred within the power interruption time, the operation time of the alarm means may be increased depending on the time setting of the power interruption time. Problems such as being too short or not working at all may occur, and the operator may leave the driver's seat and overlook the alarm action by the alarm means. In the present invention, the operation time of the alarm means is sufficient. It is possible to reduce the risk of the operator overlooking the alarm operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

<Embodiment 1>
FIG. 1 is a side view showing the configuration of the construction machine according to Embodiment 1 of the present invention. As shown in FIG. 1, the construction machine 1 is a so-called hydraulic excavator, and performs excavation of earth and sand, crushed stone, and demolition of a building at a construction site where civil engineering work or construction work is performed. The construction machine 1 includes a lower traveling body 3 provided with a crawler 2 formed by connecting a large number of plate-like members in an endless manner, and an upper revolving body 5 attached to the upper side of the lower traveling body 3 via a turning device 4. It has.

  A base 10 is provided below the upper swing body 5, and a working mechanism 11 is provided on the upper surface of the base 10 on the front side in the traveling direction. The working mechanism 11 includes a boom 12 attached to the base 10 so as to be tiltable in the vertical direction, an arm 13 attached to the tip of the boom 12 to be swingable, and a bucket connected to the tip of the arm 13. 14.

  An operator cabin 15 is disposed next to the work mechanism 11 mounting portion on the upper surface of the base 10, and an operating device and an air conditioner (not shown) for operating the work mechanism 11 are provided in the cabin 15. Is arranged. An engine, a hydraulic pump, and the like are disposed behind the working mechanism 11 on the upper surface of the base 10, and these are covered with a cover 16. Further, a counterweight 17 is mounted on the upper surface of the base 10 behind the cover 16.

  FIG. 2 is a schematic diagram showing the configuration of a common rail fuel injection device mounted on a construction machine. As shown in FIG. 2, the fuel injection device 20 includes an injector 22 that injects fuel into a cylinder 21 a of a diesel engine 21, a common rail 23 that stores high-pressure fuel to be supplied to the injector 22, and fuel from a fuel tank 25. A fuel supply pump 24 that sucks and feeds high-pressure fuel into the common rail 23 and an engine controller 26a as a control circuit 26 that performs various controls are provided.

  The injector 22 is connected to the common rail 23 via a supply pipe 20a. The injector 22 is opened and closed based on an injector drive signal from the engine controller 26a, so that the high-pressure fuel stored in the common rail 23 is injected into the combustion chamber of the cylinder 21a of the engine 21. . A return pipe 20b is connected to the injector 22, and when the engine 21 is stopped and the fuel supply pump 24 stops pumping fuel, the fuel in the injector 22 is supplied to the fuel tank 25 via the return pipe 20b. It is gradually returned to the side.

  The common rail 23 temporarily stores high-pressure fuel to be supplied to the injector 22, and the inside is maintained in a high-pressure state. The common rail 23 is attached with a pressure sensor 23a (fuel pressure detecting means) for detecting the fuel pressure of the fuel stored in the common rail 23.

  The fuel supply pump 24 sucks the fuel stored in the fuel tank 25 through the suction pipe 20c and pressurizes the fuel inside the pump to generate high-pressure fuel, and the high-pressure fuel is discharged. It is pumped to the common rail 23 via the pipe 20d. Here, a fuel filter 27 is connected in the middle of the intake pipe 20 c, and dust contained in the fuel in the fuel tank 25 is removed by the fuel filter 27 so as not to be sucked into the fuel supply pump 24.

  The engine controller 26a calculates a target fuel pressure for obtaining a fuel injection pressure at which the combustion state of the engine 21 is best based on information indicating the rotational speed of the engine 21, the accelerator opening, and the like. Feedback control is performed by controlling the fuel supply pump 24 so that the actual fuel pressure in the common rail 23 detected by the sensor 23a matches the target fuel pressure.

  Next, the engine abnormality determination device 30 for the construction machine 1 which is a characteristic part of the present invention will be described. FIG. 3 is an electric circuit diagram showing a configuration of an engine abnormality determination device for a construction machine. As shown in FIG. 3, the engine abnormality determination device 30 determines whether fuel leakage has occurred in the fuel supply system from the fuel supply pump 24 to the injector 22 in the engine 21 and performs a predetermined alarm operation. And includes a key switch 31 (switching means), a battery relay 34 (delay means), an alarm device 35, a pressure sensor 23a, and a control circuit 26.

  The key switch 31 includes an engine switch 31a for starting or stopping the engine 21, and a power switch 31b for starting or shutting off power supply from the power unit 32 to various electrical components such as the alarm device 35 and the control circuit 26. . Here, when the engine switch 31a of the key switch 31 is turned on, the starter 33 is driven to start the engine 21, while when the key switch 31 is turned off, the engine 21 is stopped by the stop of the starter 33.

The battery relay 34, while starting the power supply from the power supply unit 32 to various electrical components by the key switch 31 is turned on, by the key switch 31 is turned off to stop the engine 21, stops the engine 21 It is configured to delay the power cutoff time until the power supply to various electrical components is cut off. Thereby, electric power is supplied to various electrical components for a while after the engine 21 is stopped.

  The alarm device 35 performs a predetermined alarm operation for the operator. Specifically, it is composed of an alarm buzzer and an alarm lamp, and can alert the operator of an engine abnormality by sounding the buzzer or turning on the lamp. As another form of the alarm device 35, an alarm may be given to the operator by displaying an error on the display monitor. Further, when it is desired to issue a warning to a manager who manages the operation state of the construction machine 1 from a remote place, the warning may be issued by remotely transmitting error information by wireless or the like.

  The control circuit 26 includes an engine controller 26a and a body controller 26b. The engine controller 26 a controls the operation of the fuel injection device 20 such as the fuel pumping amount from the fuel supply pump 24 based on the fuel pressure in the common rail 23 and the opening / closing timing of the injector 22. A signal indicating the fuel pressure is input from the pressure sensor 23a of the common rail 23 to the engine controller 26a. Further, the airframe controller 26b transmits a signal to and from the engine controller 26a, so that a signal indicating the fuel pressure is input.

  The machine controller 26b controls operations of various electrical components such as the battery relay 34 and the alarm device 35. Specifically, it is determined whether a fuel leak has occurred in the fuel supply system in the engine 21, and if a fuel leak has occurred, the alarm device 35 is activated to warn the operator of an abnormality. Is controlling.

  FIG. 4 is a graph showing the rate of decrease of the fuel pressure in the common rail after the engine is stopped. As shown in FIG. 4, when the engine 21 is stopped, the fuel supply pump 24 stops the pumping of the fuel, so that the fuel stored in the common rail 23 gradually moves from the injector 22 to the fuel tank 25 side via the return pipe 20 b. It will be returned to. As a result, the fuel pressure in the common rail 23 gradually decreases. Here, when the fuel supply system of the engine 21 is operating normally, the fuel pressure after the engine 21 is stopped gradually decreases.

  However, if there is an abnormality in the fuel supply system, such as when the injector 22 is internally damaged or cracked, a fuel leak will occur from the damaged part, and the fuel pressure after the engine 21 is stopped is , It will drop sharply.

  Therefore, in the present invention, after the key switch 31 is turned off and the engine 21 is stopped, the fuel pressure detected by the pressure sensor 23a is equal to or lower than a predetermined pressure (determination threshold) at a predetermined fuel leak determination time within the power interruption time. In the case of a drop in the fuel level, it is determined that a fuel leak has occurred in the fuel supply system.

  Next, a series of operation procedures from the work start to the work end in the construction machine 1 will be described with reference to FIGS. 3 and 5. FIG. 5 is a flowchart showing the operation procedure of the construction machine. As shown in FIG. 5, first, in step S101, the key switch 31 is turned on to start the starter 33, and the process proceeds to the subsequent step S102.

  In step S102, the battery relay 34 is turned on by turning on the key switch 31, power is supplied to various electrical components such as the engine controller 26a, the body controller 26b, the alarm device 35, and the process proceeds to the subsequent step S103. In step S103, the engine 21 is started by the engine controller 26a, and the process proceeds to the subsequent step S104.

  In step S104, the key switch 31 is turned off at the end of the operation to stop the starter 33, and the process proceeds to the subsequent step S105. In step S105, the engine controller 26a starts a stop operation of the engine 21, and the process proceeds to the subsequent step S106.

  In step S106, the fuel pressure in the common rail 23 is detected by the pressure sensor 23a, and the process proceeds to the subsequent step S107.

  In step S107, after a predetermined fuel leak determination time within the power cut-off time has elapsed since the key switch 31 was turned off, the fuel pressure in the common rail 23 is detected again by the pressure sensor 23a, and the process proceeds to the subsequent step S108. .

  In step S108, it is determined whether the fuel pressure after the fuel leak determination time has elapsed is equal to or lower than a predetermined pressure. Specifically, it is determined whether or not the fuel pressure after the fuel leak determination time has elapsed is below a preset determination threshold. If the determination in step S108 is “YES”, it is determined that a fuel leak has occurred in the fuel supply system, and the process branches to step S110. If the determination in step S108 is “NO”, it is determined that there is no abnormality in the fuel supply system, that is, it is operating normally, and the process branches to step S109. In step S109, the process waits until an initial power cut-off time (several seconds) elapses, and then proceeds to step S111.

  In step S110, the body controller 26b maintains the battery relay 34 in the on state, thereby continuing to supply power to various electrical components and delaying the initially set power cutoff time. Then, the alarm buzzer as the alarm device 35 continues to sound for 2 to 30 seconds until the power cutoff time after resetting elapses, and the process proceeds to the subsequent step S111.

  In step S111, after the power cut-off time has elapsed, the battery relay 34 is turned off to cut off the supply of power to the various electrical components, and the process ends.

  It should be noted that it is preferable to appropriately change the power cut-off time by a set time by the alarm operation of the alarm device 35. For example, when the alarm is given to the operator by continuously sounding the alarm buzzer, it is preferable to set the alarm buzzer sounding time short because it makes noise to other operators who are working in the surroundings. Further, when the operator is warned by turning on the warning lamp, the influence on the surroundings is not so great, and the setting may be continued for a relatively long time.

  As described above, according to the engine abnormality determination device 30 of the construction machine 1 according to the first embodiment, when it is determined that a fuel leak has occurred within the power interruption time after the engine 21 is stopped. By delaying the power interruption time by a predetermined set time, it is possible to secure a sufficiently long time for the alarm device 35 to perform the alarm operation, and to reduce the possibility that the operator misses the alarm operation.

  In the first embodiment, the battery relay 34 is controlled to reset the power cut-off time for all electrical components including the alarm device 35. However, the present invention is not limited to this mode. For example, the alarm device Only the power cut-off time for 35 may be delayed by a predetermined set time. With such a configuration, power supply to electrical components that are not directly required for the alarm operation is cut off after the preset power cut-off time has elapsed, and power is continuously supplied only to the alarm device 35. It becomes. In this way, by not supplying power to electrical components that are not directly required for the alarm operation after the initial power cut-off time has elapsed, power saving can be achieved for the entire apparatus.

<Embodiment 2>
FIG. 6 is an electric circuit diagram showing the configuration of the engine abnormality determination device for a construction machine according to the second embodiment. Since the difference from the first embodiment is that a storage device 41 for storing engine abnormality information is provided, the same parts as those in the first embodiment are denoted by the same reference numerals, and only the differences will be described.

  As shown in FIG. 6, the engine abnormality determination device 40 includes a storage device 41 composed of a storage medium such as a RAM. The storage device 41 is connected to the airframe controller 26b, and when the airframe controller 26b determines that a fuel leak has occurred in the fuel supply system in the engine 21, engine abnormality information indicating the occurrence of the fuel leak. Is to be memorized.

  Next, a series of operation procedures from the start of work to the end of work in the construction machine 1 will be described with reference to FIGS. 6 and 7. FIG. 7 is a flowchart showing the operation procedure of the construction machine. As shown in FIG. 7, first, in step S201, the key switch 31 is turned on to start the starter 33, and the process proceeds to the subsequent step S202.

  In step S202, the battery relay 34 is turned on by turning on the key switch 31, power is supplied to various electrical components such as the engine controller 26a, the airframe controller 26b, the alarm device 35, and the process proceeds to the subsequent step S203. In step S203, the engine 21 is started by the engine controller 26a, and the process proceeds to the subsequent step S204.

  In step S204, it is determined whether engine abnormality information is stored in the storage device 41. If the determination in step S204 is “YES”, the process branches to step S205, the alarm buzzer as the alarm device 35 is sounded for a predetermined time in step S205, and the process proceeds to the subsequent step S206. If “NO” at step S204, the process branches to step S206.

  In step S206, the key switch 31 is turned off at the end of the work to stop the starter 33, and the process proceeds to the subsequent step S207. In step S207, the engine controller 26a starts a stop operation of the engine 21, and the process proceeds to the subsequent step S208.

  In step S208, the fuel pressure in the common rail 23 is detected by the pressure sensor 23a, and the process proceeds to the subsequent step S209.

  In step S209, the fuel pressure in the common rail 23 is detected again by the pressure sensor 23a after a predetermined fuel leak determination time within the power cut-off time has elapsed since the key switch 31 was turned off, and the process proceeds to the subsequent step S210. .

  In step S210, it is determined whether the fuel pressure after the fuel leak determination time has elapsed is equal to or lower than a predetermined pressure. Specifically, it is determined whether or not the fuel pressure after the fuel leak determination time has elapsed is below a preset determination threshold. If the determination in step S210 is "YES", it is determined that a fuel leak has occurred in the fuel supply system, and the process branches to step S212. If the determination in step S210 is “NO”, it is determined that there is no abnormality in the fuel supply system, that is, it is operating normally, and the process branches to step S211. In step S211, the process waits until an initial power cut-off time (several seconds) elapses, and then proceeds to step S214.

  In step S212, engine abnormality information indicating that a fuel leak has occurred is stored in the storage device 41, and the process proceeds to subsequent step S213. In step S213, the body controller 26b maintains the battery relay 34 in the on state, thereby continuing to supply power to various electrical components and delaying the initially set power cutoff time. Then, the alarm buzzer as the alarm device 35 is continuously sounded for 2 to 30 seconds until the power cutoff time after resetting elapses, and the process proceeds to the subsequent step S214.

  In step S214, after the power cut-off time has elapsed, the battery relay 34 is turned off to cut off the supply of power to the various electrical components, and the process ends.

  As described above, according to the engine abnormality determination device 30 of the construction machine 1 according to the second embodiment, the occurrence of fuel leak is warned to the operator by determining the presence or absence of engine abnormality information when the engine 21 is started. Can do. That is, even if the operator misses the alarm operation after the engine 21 is stopped and does not notice the occurrence of the fuel leak, the engine 21 is started based on the engine abnormality information stored in the storage device 41 when the engine 21 is stopped. Since the warning operation is performed by the warning device 35, the operator can reliably recognize the occurrence of the fuel leak before the work starts.

  As described above, the present invention is extremely useful because it provides a highly practical effect that an alarm operation can be appropriately performed for an operator even when the occurrence of fuel leak is detected after the engine is stopped. And industrial applicability is high.

It is a side view which shows the structure of the construction machine which concerns on Embodiment 1 of this invention. It is the schematic which shows the structure of the common rail type fuel-injection apparatus mounted in the construction machine. It is an electric circuit diagram which shows the structure of the engine abnormality determination apparatus of a construction machine. It is a graph which shows the fall speed of the fuel pressure in the common rail after an engine stops. It is a flowchart figure which shows the operation | movement procedure of a construction machine. It is an electric circuit diagram which shows the structure of the engine abnormality determination apparatus of the construction machine which concerns on this Embodiment 2. FIG. It is a flowchart figure which shows the operation | movement procedure of a construction machine.

DESCRIPTION OF SYMBOLS 1 Construction machine 21 Engine 23 Common rail 23a Pressure sensor (fuel pressure detection means)
26 Control circuit (control means)
26a Engine controller 26b Airframe controller 30 Engine abnormality determination device 31 Key switch (switching means)
32 Power supply unit 34 Battery relay (delay means)
35 Alarm device (alarm means)
40 Engine abnormality determination device 41 Storage device (storage means)

Claims (3)

An engine provided with a common rail for storing high-pressure fuel, a power supply unit for supplying power to a plurality of electrical components, and starting or stopping the engine and starting power supply from the power supply unit to the electrical components Or an engine abnormality determination device for a construction machine provided with switching means for blocking,
Delay means for delaying an initially set power cutoff time from when the engine is stopped by the switching means until the power supply to the electrical component is cut off;
Fuel pressure detecting means for detecting the fuel pressure in the common rail;
Alarm means that constitutes at least one of the plurality of electrical components and performs a predetermined alarm operation for an operator;
After the engine is stopped by the switching means, the initial while set power interruption time to interrupt power supply to the electrical equipment when the elapsed, the detected fuel pressure in said fuel pressure detecting means life該初When the pressure drops below a predetermined pressure at a predetermined time within the set power cut-off time, it is determined that a fuel leak has occurred in the engine, and the initially set power cut-off time is determined by the delay means. Risho causes only a delay constant of the set time, until reconfigured power interruption time has elapsed, for a construction machine is characterized in that a control means for controlling to actuate said alarm means engine Abnormality judgment device. In claim 1,
When the control means determines that a fuel leak has occurred in the engine, the control means cuts off power supply to the electrical components except for the warning means when the initially set power cutoff time has elapsed. An engine abnormality determination device for a construction machine , wherein the alarm means is operated until the power cut-off time reset by the delay means elapses . In claim 1 or 2,
Storage means for storing engine abnormality information indicating the occurrence of fuel leak when the control means determines that a fuel leak has occurred in the engine;
The control means determines whether or not the engine abnormality information is stored in the storage means when the engine is started by the switching means, and if the engine abnormality information is stored, the control means An engine abnormality determination device for a construction machine, which is configured to operate.

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