Engineering machinery, fault diagnosis method, device and readable storage medium thereof

Abstract

The present invention provides a construction machine and its fault diagnosis method, device, and readable storage medium. The construction machine includes an engine controller. The fault diagnosis method includes: when the construction machine is in a first state, monitoring a first signal, the first signal being used to confirm whether a power-on signal input to the engine controller is valid; if the power-on signal is invalid, after waiting for a preset period of time, monitoring a second signal, the second signal being used to confirm whether the engine controller has received a vehicle speed message; and confirming whether the engine controller has a fault based on the second signal; wherein the first state is a state in which the construction machine is powered on normally and the communication bus of the construction machine is normal. Through the above-mentioned technical solution, the present invention allows for rapid troubleshooting and determination of the fault location when the engine abnormally shuts down, facilitating rapid maintenance and ensuring the reliability of the construction machine's operation.

Description

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on June 29, 2022, with application number "202210746548.5" and application name "Engineering machinery and its fault diagnosis method, device and readable storage medium", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of engineering machinery, and in particular to an engineering machinery and a fault diagnosis method, device and readable storage medium thereof. Background Art

[0003] In the prior art, the engine controller of construction machinery typically determines whether to shut down the engine based on the validity of the received key-on signal (i.e., the vehicle's power-on signal). If the key is normally in the on position but the engine controller circuitry malfunctions, this approach could cause the engine controller to mistakenly determine that the key is not in the on position, resulting in an abnormal engine shutdown and compromising the safe operation of the construction machinery. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art.

[0005] To this end, a first aspect of the present invention is to provide a fault diagnosis method for engineering machinery.

[0006] A second aspect of the present invention is to provide a fault diagnosis device for engineering machinery.

[0007] A third aspect of the present invention is to provide a fault diagnosis device for engineering machinery.

[0008] A fourth aspect of the present invention is to provide a readable storage medium.

[0009] A fifth aspect of the present invention is to provide an engineering machine.

[0010] In view of this, according to one aspect of the present invention, a fault diagnosis method for construction machinery is proposed, wherein the construction machinery includes an engine controller, and the fault diagnosis method includes: when the construction machinery is in a first state, monitoring a first signal, the first signal being used to confirm whether a power-on signal input to the engine controller is valid; when the power-on signal is invalid, after waiting for a preset period of time, monitoring a second signal, the second signal being used to confirm whether the engine controller receives a vehicle speed message; confirming whether there is a fault in the engine controller based on the second signal; wherein the first state is a state in which the construction machinery is powered on normally and the communication bus of the construction machinery is normal.

[0011] It should be noted that the executor of the engineering machinery fault diagnosis method proposed in the present invention may be a fault diagnosis device of the engineering machinery. In order to more clearly illustrate the engineering machinery fault diagnosis method proposed in the present invention, the following technical solution uses the executor of the engineering machinery fault diagnosis method as an example of a fault diagnosis device of the engineering machinery.

[0012] In this technical solution, the engineering machinery includes an engine controller, the first signal can be used to determine whether the power-on signal input to the engine controller is valid, and the second signal can be used to determine whether the engine controller receives a vehicle speed message.

[0013] Specifically, the fault diagnosis device first determines whether the construction machine is in a first state. If the construction machine is in the first state, the device then monitors a first signal, specifically, whether the power-on signal input to the engine controller is valid. Specifically, if the construction machine is in the first state, this indicates that the construction machine is properly powered on and its communication bus is functioning normally. In this case, fault monitoring and diagnosis of the construction machine are meaningful.

[0014] Specifically, a valid power-on signal will only be generated when the key of the construction machinery is in the ON position. When the power-on signal is valid, the engine controller will detect the signal that the key is in the ON position. Therefore, the fault diagnosis device can determine whether the power-on signal input to the engine controller is valid by determining whether the engine controller detects the signal that the key is in the ON position.

[0015] Furthermore, when the fault diagnosis device determines that the power-on signal input to the engine controller is invalid, that is, the engine controller does not detect the signal that the key is in the ON position, the fault diagnosis device waits for a preset period of time and then monitors the second signal used to confirm whether the engine controller receives the vehicle speed message.

[0016] Specifically, if the engine controller does not detect the signal that the key is in the ON position, it means that the key of the construction machinery may not be in the ON position at this time, so it is necessary to further confirm whether the engine controller receives the vehicle speed message by monitoring the second signal to determine whether there is a fault in the transmission signal of the engine controller's power-on signal.

[0017] Furthermore, the fault diagnosis device uses the aforementioned second signal to determine whether a fault exists in the engine controller. Specifically, during normal operation of the construction machinery, the instrumentation of the construction machinery also monitors the power-on signal and, if the power-on signal is valid, transmits a speed message to the engine controller. Therefore, the fault diagnosis device can further determine whether the key is in the ON position based on whether the engine controller receives the speed message. This allows for rapid troubleshooting and identification of the fault location in the event of an abnormal engine shutdown.

[0018] It should be noted that, since the order in which the power-off signals are sent to the engine controller and the instrument device is inconsistent when the key is in the off position, that is, the power-off timing of the two is inconsistent, the instrument device may stop sending the vehicle speed message to the engine controller slower than the engine controller detects that the power-on signal is invalid. Therefore, in order to avoid misjudgment, the fault diagnosis device needs to wait for a preset period of time before monitoring the second signal after determining that the power-on signal input to the engine controller is invalid. In this way, misjudgment of engine controller faults is avoided and the accuracy of fault diagnosis is ensured.

[0019] In this technical solution, after confirming that the construction machinery is in a first state, the fault diagnosis device monitors the first signal. When it is determined based on the first signal that the power-on signal input to the engine controller is invalid, the fault diagnosis device can confirm whether the engine controller has a fault by monitoring the second signal. In the technical solution of the present invention, when it is determined that the power-on signal input to the engine controller is invalid, the fault diagnosis device can further confirm whether the power-on signal of the construction machinery is invalid based on whether the engine controller has received a vehicle speed message, that is, confirm whether the key is in the ON position. This allows for rapid troubleshooting and identification of the fault location in the event of an abnormal engine shutdown, facilitating rapid maintenance and ensuring the reliability of the construction machinery's operation.

[0020] In addition, the fault diagnosis method for engineering machinery proposed according to the above technical solution of the present invention may also have the following additional technical features:

[0021] In the above technical solution, the step of confirming whether the engine controller has a fault according to the second signal specifically includes: determining that the engine controller has no fault when it is determined according to the second signal that the engine controller has not received the vehicle speed message.

[0022] In this technical solution, the process of confirming whether there is a fault in the engine controller based on the second signal is: the fault diagnosis device confirms whether the engine controller has received the vehicle speed message based on the second signal, and if it is determined that the engine controller has not received the vehicle speed message, confirms that there is no fault in the engine controller.

[0023] Specifically, during normal operation of the construction machinery, the instrumentation device of the construction machinery also monitors the power-on signal and, if it detects a valid power-on signal, transmits a speed message to the engine controller. Therefore, if it is determined that the engine controller has not received the speed message, then the power-on signal monitored by the instrumentation device is also invalid. Therefore, it can be clearly determined that the construction machinery key is not in the ON position, that is, the result of the first signal monitored by the fault diagnosis device is correct, and therefore it can be determined that there is no fault in the power-on signal transmission circuit of the engine controller.

[0024] In this technical solution, the fault diagnosis device can re-determine whether the power-on signal is invalid based on whether the engine controller receives the vehicle speed message, that is, re-determine whether the key is in the ON position. In this way, it can quickly determine whether the engine is shut down normally and whether the abnormal engine shutdown is caused by a fault in the power-on signal transmission line of the engine controller, thereby avoiding the situation where the engine is abnormally shut down due to an abnormality in the power-on signal transmission line of the engine controller.

[0025] In the above technical solution, the step of confirming whether the engine controller has a fault according to the second signal specifically includes: when it is determined according to the second signal that the engine controller has received the vehicle speed message, determining that there is a signal transmission line fault in the engine controller.

[0026] In this technical solution, the process of confirming whether there is a fault in the engine controller based on the second signal is: the fault diagnosis device confirms whether the engine controller has received the vehicle speed message based on the second signal, and if it is determined that the engine controller has received the vehicle speed message, confirms that there is a signal transmission line fault in the engine controller.

[0027] Specifically, during normal operation of the construction machinery, the instrumentation of the construction machinery also monitors the power-on signal and, if it detects a valid power-on signal, sends a speed message to the engine controller. Therefore, if the engine controller is confirmed to have received the speed message, it indicates that the power-on signal monitored by the instrumentation is also valid. Therefore, it can be determined that the construction machinery key is currently in the ON position. Therefore, the engine controller's failure to detect the power-on signal is due to an abnormality in its signal transmission line, thus confirming a fault in the engine controller's signal transmission line.

[0028] In this technical solution, the fault diagnosis device can re-determine whether the power-on signal is invalid based on whether the engine controller receives the vehicle speed message, that is, re-determine whether the key is in the ON position. In this way, it can quickly determine whether the engine is shut down normally and whether the abnormal engine shutdown is caused by a fault in the signal transmission line of the engine controller, thereby avoiding the situation where the engine is abnormally shut down due to an abnormal signal transmission line of the engine controller.

[0029] In the above technical solution, when the engineering machinery is in the first state, before monitoring the first signal, the fault diagnosis method also includes: after confirming that the power-on signal input to the engine controller is valid, monitoring the second signal after waiting for a preset period of time; and confirming the operating status of the engineering machinery based on the second signal.

[0030] In this technical aspect, before monitoring the first signal, the fault diagnosis device needs to determine the operating status of the engineering machinery, that is, whether the engineering machinery is powered on normally and whether the communication bus of the engineering machinery is normal.

[0031] Specifically, the fault diagnosis device first determines whether the power-on signal input to the engine controller is valid. Specifically, the fault diagnosis device can indirectly determine whether the entire construction machinery vehicle is powered on normally by determining whether the power-on signal input to the engine controller is valid.

[0032] Specifically, if the power-on signal input to the engine controller is valid, it indicates that the entire construction machinery vehicle is powered on normally; if the power-on signal input to the engine controller is invalid, it indicates that the entire construction machinery vehicle is not powered on.

[0033] Furthermore, the fault diagnosis device can also determine whether the entire construction machinery vehicle is powered on normally by determining whether the power-on signal detected by the instrument device is valid.

[0034] Furthermore, when it is confirmed that the power-on signal input to the engine controller is valid, that is, when it is confirmed that the entire engineering machinery is powered on normally, after waiting for a preset period of time, it is determined whether the communication bus of the engineering machinery is normal by monitoring the second signal.

[0035] Specifically, when confirming that the entire construction machinery is powered on normally, by confirming whether the communication bus of the construction machinery is normal, it can be determined whether the construction machinery is in a normal operating state or an abnormal operating state. In the subsequent steps, the fault diagnosis device will only diagnose whether the engine stall is caused by an engine controller failure by monitoring the first signal and the second signal when the construction machinery is in a normal operating state, thereby avoiding meaningless fault diagnosis.

[0036] It should be noted that, since the order in which the power-on signals are sent to the engine controller and the instrument device is inconsistent when the key is in the ON position, that is, the power-on timing of the two is inconsistent, the instrument device may send a vehicle speed message to the engine controller slower than the engine controller detects that the power-on signal is valid. Therefore, in order to avoid wrong judgment, the fault diagnosis device needs to wait for a preset time before monitoring the second signal after determining that the power-on signal input to the engine controller is valid. In this way, wrong judgment of the operating status of the construction machinery is avoided and the accuracy of the judgment of the operating status of the construction machinery is guaranteed.

[0037] In this technical solution, before monitoring the first signal, the fault diagnosis detection device needs to determine whether the power supply of the engineering machinery is normal and whether the communication bus of the engineering machinery is normal to determine the operating status of the engineering machinery. In this way, it is ensured that in the subsequent steps, the fault diagnosis device performs fault diagnosis on the engine controller when the engineering machinery is in normal operating state (corresponding to the above-mentioned first state), that is, when the engineering machinery meets the fault diagnosis requirements, thereby avoiding meaningless fault diagnosis of the engineering machinery.

[0038] In the above technical solution, the step of confirming the operating state of the construction machinery according to the second signal specifically includes: confirming that the construction machinery is in the first state when it is determined according to the second signal that the engine controller has received the vehicle speed message.

[0039] In this technical solution, the process of confirming the operating status of the construction machinery according to the second signal is as follows: the fault diagnosis device confirms whether the engine controller has received the vehicle speed message according to the second signal, and confirms that the construction machinery is in the first state when it is determined that the engine controller has received the vehicle speed message.

[0040] Specifically, when the construction machinery is operating normally, the instrument device will send a vehicle speed message to the engine controller through the communication bus. Therefore, if it is determined that the engine controller has received the vehicle speed message, it means that the communication bus can transmit information, that is, it can be clearly seen that there is no abnormality in the communication bus of the construction machinery. At this time, it can be determined that the entire construction machinery is powered on normally, and the communication bus of the construction machinery is also in a normal state, so it can be determined that the construction machinery is in the first state.

[0041] In this technical solution, the fault diagnosis device determines that the construction machine's communication bus is normal after the engine controller receives the vehicle speed message, and further determines that the construction machine is in the first state. This ensures that in subsequent steps, the fault diagnosis device performs engine controller fault diagnosis when the construction machine is in the first state, that is, when the construction machine meets the fault diagnosis requirements, thereby avoiding meaningless fault diagnosis of the construction machine.

[0042] In the above technical solution, the step of confirming the operating status of the construction machinery according to the second signal specifically includes: when it is determined according to the second signal that the engine controller has not received the vehicle speed message, confirming that the construction machinery is not in the first state and that there is a fault in the communication bus of the construction machinery.

[0043] In this technical solution, the process of confirming the operating status of the construction machinery based on the second signal is: the fault diagnosis device confirms whether the engine controller has received the vehicle speed message based on the second signal, and when it is determined that the engine controller has not received the vehicle speed message, it confirms that the construction machinery is not in the first state, and it can be determined that there is a fault in the communication bus of the construction machinery.

[0044] Specifically, when the construction machinery is operating normally, the instrument device will send a vehicle speed message to the engine controller through the communication bus. Therefore, if it is determined that the engine controller has not received the vehicle speed message, it means that the communication bus cannot transmit information, and it can be determined that there may be a fault in the communication bus. At this time, it can be determined that the entire construction machinery is powered on normally, but there may be a fault in the communication bus of the construction machinery, so it can be determined that the construction machinery is not in the first state.

[0045] In this technical solution, if the fault diagnosis device determines that the engine controller has not received the vehicle speed message, it determines that there is an abnormality in the construction machine's communication bus, and further determines that the construction machine is not in the first state. This prevents the fault diagnosis device from continuing to perform subsequent steps to diagnose the engine controller's fault. This ensures that the fault diagnosis device performs fault diagnosis on the engine controller when the construction machine is in the first state, that is, when the construction machine meets the fault diagnosis requirements, thus avoiding meaningless fault diagnosis of the construction machine.

[0046] According to a second aspect of the present invention, a fault diagnosis device for engineering machinery is proposed, wherein the engineering machinery includes an engine controller, and the fault diagnosis device includes: a first processing module for monitoring a first signal when the engineering machinery is in a first state, the first signal being used to confirm whether a power-on signal input to the engine controller is valid; a second processing module for monitoring a second signal after waiting for a first preset time period when the power-on signal is invalid, the second signal being used to confirm whether the engine controller has received a vehicle speed message; a third processing module for confirming whether there is a fault in the engine controller based on the second signal; wherein the first state is a state in which the engineering machinery is powered on normally and the communication bus of the engineering machinery is normal.

[0047] In this technical solution, the engineering machinery includes an engine controller, the first signal can be used to determine whether the power-on signal input to the engine controller is valid, and the second signal can be used to determine whether the engine controller receives a vehicle speed message.

[0048] Specifically, the first processing module first determines whether the construction machine is in the first state. If the construction machine is in the first state, it then monitors the first signal, specifically, whether the power-on signal input to the engine controller is valid. Specifically, if the construction machine is in the first state, this indicates that the construction machine is properly powered on and its communication bus is functioning normally. In this case, fault monitoring and diagnosis of the construction machine are meaningful.

[0049] Specifically, a valid power-on signal will only be generated when the key of the construction machinery is in the ON position. When the power-on signal is valid, the engine controller will detect the signal that the key is in the ON position. Therefore, the first processing module can determine whether the power-on signal input to the engine controller is valid by determining whether the engine controller detects the signal that the key is in the ON position.

[0050] Furthermore, when the first processing module determines that the power-on signal input to the engine controller is invalid, that is, the engine controller does not detect the signal that the key is in the ON position, the second processing module waits for a preset period of time and then monitors the second signal used to confirm whether the engine controller receives the vehicle speed message.

[0051] Specifically, if the engine controller does not detect the signal that the key is in the ON position, it indicates that the key of the construction machinery may not be in the ON position at this time, so the second processing module needs to further confirm whether the engine controller has received the vehicle speed message by monitoring the second signal to determine whether there is a fault in the transmission signal of the engine controller's power-on signal.

[0052] It should be noted that, since the order in which the power-off signals are sent to the engine controller and the instrument device is inconsistent when the key is in the off position, that is, the power-off timing of the two is inconsistent, the instrument device may stop sending the vehicle speed message to the engine controller slower than the engine controller detects that the power-on signal is invalid. Therefore, in order to avoid misjudgment, the second processing module needs to wait for a preset time before monitoring the second signal after determining that the power-on signal input to the engine controller is invalid. In this way, misjudgment of engine controller failure is avoided and the accuracy of fault diagnosis is ensured.

[0053] Furthermore, the third processing module determines whether there is a fault in the engine controller based on the second signal. Specifically, during normal operation of the construction machinery, the instrumentation of the construction machinery also monitors the power-on signal and, if the power-on signal is valid, transmits a speed message to the engine controller. Therefore, the third processing module can further determine whether the key is in the ON position based on whether the engine controller receives the speed message. This allows for rapid troubleshooting and identification of the fault location in the event of an abnormal engine shutdown.

[0054] In this technical solution, after confirming that the construction machinery is in the first state, the first processing module monitors the first signal. When it is determined based on the first signal that the power-on signal input to the engine controller is invalid, the third processing module can confirm whether the engine controller is faulty based on the second signal monitored by the second processing module. In the technical solution of the present invention, when it is determined that the power-on signal input to the engine controller is invalid, the third processing module can further confirm whether the power-on signal of the construction machinery is invalid based on whether the engine controller receives a vehicle speed message, that is, confirm whether the key is in the ON position. In this way, when the engine abnormally shuts down, the fault location can be quickly identified and located, facilitating rapid maintenance and ensuring the reliability of the construction machinery's operation.

[0055] According to the third aspect of the present invention, a fault diagnosis device for engineering machinery is proposed, and the fault diagnosis device includes: a memory, in which a program or instruction is stored; a processor, which executes the program or instruction stored in the memory to implement the steps of the fault diagnosis method for engineering machinery proposed in the above technical solution of the present invention, and thus has all the beneficial technical effects of the fault diagnosis method for engineering machinery proposed in the above technical solution of the present invention, which will not be elaborated on here.

[0056] According to a fourth aspect of the present invention, a readable storage medium is provided, which stores a program or instructions. When executed by a processor, the program or instructions implement the engineering machinery fault diagnosis method provided by the above-mentioned technical solution of the present invention. Therefore, the readable storage medium has all the beneficial effects of the engineering machinery fault diagnosis method provided by the above-mentioned technical solution of the present invention, and no further details are given here.

[0057] According to the fifth aspect of the present invention, an engineering machinery is proposed, comprising a fault diagnosis device for engineering machinery as proposed in the above technical solution of the present invention, and / or a readable storage medium as proposed in the above technical solution of the present invention. Therefore, the engineering machinery has all the beneficial effects of the fault diagnosis device for engineering machinery proposed in the above technical solution of the present invention and / or the readable storage medium proposed in the above technical solution of the present invention, which will not be repeated here.

[0058] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0060] Figure 1 A schematic diagram showing a flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention;

[0061] Figure 2 A second flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention is shown;

[0062] Figure 3 A third flowchart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention is shown;

[0063] Figure 4 A fourth flowchart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention is shown;

[0064] Figure 5 FIG5 shows a fifth flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention;

[0065] Figure 6 FIG6 shows a sixth flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention;

[0066] Figure 7 One of the schematic block diagrams of the fault diagnosis device for engineering machinery according to an embodiment of the present invention is shown;

[0067] Figure 8 A second schematic block diagram of a fault diagnosis device for engineering machinery according to an embodiment of the present invention is shown;

[0068] Figure 9 The figure shows the overall flow chart of the fault diagnosis method for engineering machinery according to the embodiment of the present invention. DETAILED DESCRIPTION

[0069] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0070] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0071] The following combination Figures 1 to 9 , an engineering machinery and its fault diagnosis method, device and readable storage medium provided by the embodiment of the present invention are described in detail through specific embodiments and application scenarios.

[0072] Example 1:

[0073] Figure 1A flow chart of a fault diagnosis method for an engineering machine according to an embodiment of the present invention is shown. The engineering machine includes an engine controller. The fault diagnosis method includes:

[0074] S102, when the construction machine is in a first state, monitoring a first signal, where the first signal is used to confirm whether a power-on signal input to the engine controller is valid;

[0075] S104, when the power-on signal is invalid, after waiting for a preset time, monitoring a second signal, the second signal being used to confirm whether the engine controller has received the vehicle speed message;

[0076] S106: Determine whether the engine controller has a fault based on the second signal.

[0077] The first state is a state in which the engineering machinery is powered on normally and the communication bus of the engineering machinery is normal.

[0078] It should be noted that the executor of the engineering machinery fault diagnosis method proposed in the present invention may be a fault diagnosis device for engineering machinery. In order to more clearly illustrate the engineering machinery fault diagnosis method proposed in the present invention, the following embodiments will exemplify the executor of the engineering machinery fault diagnosis method as a fault diagnosis device for engineering machinery.

[0079] In this embodiment, the engineering machinery includes an engine controller, the first signal can be used to determine whether a power-on signal input to the engine controller is valid, and the second signal can be used to determine whether the engine controller receives a vehicle speed message.

[0080] Specifically, the fault diagnosis device first determines whether the construction machine is in a first state. If the construction machine is in the first state, the device then monitors a first signal, specifically, whether the power-on signal input to the engine controller is valid. Specifically, if the construction machine is in the first state, this indicates that the construction machine is properly powered on and its communication bus is functioning normally. In this case, fault monitoring and diagnosis of the construction machine are meaningful.

[0081] Specifically, a valid power-on signal will only be generated when the key of the construction machinery is in the ON position. When the power-on signal is valid, the engine controller will detect the signal that the key is in the ON position. Therefore, the fault diagnosis device can determine whether the power-on signal input to the engine controller is valid by determining whether the engine controller detects the signal that the key is in the ON position.

[0082] Furthermore, when the fault diagnosis device determines that the power-on signal input to the engine controller is invalid, that is, the engine controller does not detect the signal that the key is in the ON position, the fault diagnosis device waits for a preset period of time and then monitors the second signal used to confirm whether the engine controller receives the vehicle speed message.

[0083] Specifically, if the engine controller does not detect the signal that the key is in the ON position, it means that the key of the construction machinery may not be in the ON position at this time, so it is necessary to further confirm whether the engine controller receives the vehicle speed message by monitoring the second signal to determine whether there is a fault in the transmission signal of the engine controller's power-on signal.

[0084] Furthermore, the fault diagnosis device confirms whether there is a fault in the engine controller based on the aforementioned second signal. Specifically, during normal operation of the construction machinery, the instrument device of the construction machinery will also monitor the power-on signal and, if it detects that the power-on signal is valid, send a vehicle speed message of the construction machinery to the engine controller. Therefore, the fault diagnosis device can again determine whether the key is in the ON position based on whether the engine controller receives the vehicle speed message. In this way, when the engine abnormally shuts down, the fault location can be quickly identified and located. It should be noted that, because the order in which the power-off signal is sent to the engine controller and the instrument device is inconsistent when the key is in the OFF position, that is, the power-off timing of the two is inconsistent, the instrument device may stop sending the vehicle speed message to the engine controller later than the engine controller detects that the power-on signal is invalid. Therefore, in order to avoid misjudgment, the fault diagnosis device needs to wait for a preset period of time before monitoring the second signal after determining that the power-on signal input to the engine controller is invalid. This avoids misjudgment of engine controller faults and ensures the accuracy of fault diagnosis.

[0085] In this embodiment, after confirming that the construction machine is in a first state, the fault diagnosis device monitors the first signal. When the power-on signal input to the engine controller is determined to be invalid based on the first signal, the fault diagnosis device can confirm whether the engine controller has a fault by monitoring the second signal. In this embodiment of the present invention, when the power-on signal input to the engine controller is determined to be invalid, the fault diagnosis device can further confirm whether the power-on signal of the construction machine is invalid based on whether the engine controller has received a vehicle speed message, that is, confirm whether the key is in the ON position. This allows for rapid troubleshooting and identification of the faulty device in the event of an abnormal engine shutdown, facilitating rapid maintenance and ensuring reliable operation of the construction machine.

[0086] Figure 2 A schematic flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention is shown. The method comprises:

[0087] S202, when the construction machine is in a first state, monitoring a first signal, the first signal being used to confirm whether a power-on signal input to the engine controller is valid;

[0088] S204, when the power-on signal is invalid, after waiting for a preset time, monitoring a second signal, the second signal being used to confirm whether the engine controller has received the vehicle speed message;

[0089] S206: When it is determined according to the second signal that the engine controller has not received the vehicle speed message, it is determined that there is no fault in the engine controller.

[0090] In this embodiment, the process of confirming whether the engine controller has a fault based on the second signal is: the fault diagnosis device confirms whether the engine controller has received the vehicle speed message based on the second signal, and if it is determined that the engine controller has not received the vehicle speed message, confirms that there is no fault in the engine controller.

[0091] Specifically, during normal operation of the construction machinery, the instrumentation device of the construction machinery also monitors the power-on signal and, if it detects a valid power-on signal, transmits a speed message to the engine controller. Therefore, if it is determined that the engine controller has not received the speed message, then the power-on signal monitored by the instrumentation device is also invalid. Therefore, it can be clearly determined that the construction machinery key is not in the ON position, that is, the result of the first signal monitored by the fault diagnosis device is correct, and therefore it can be determined that there is no fault in the power-on signal transmission circuit of the engine controller.

[0092] In this embodiment, the fault diagnosis device can re-determine whether the power-on signal is invalid based on whether the engine controller receives the vehicle speed message, that is, re-determine whether the key is in the ON position. In this way, it can quickly determine whether the engine is shut down normally and whether the abnormal engine shutdown is caused by a fault in the power-on signal transmission line of the engine controller, thereby avoiding the situation where the engine is abnormally shut down due to an abnormality in the power-on signal transmission line of the engine controller.

[0093] Figure 3 A schematic flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention is shown. The method comprises:

[0094] S302, when the construction machine is in a first state, monitoring a first signal, the first signal being used to confirm whether a power-on signal input to the engine controller is valid;

[0095] S304, when the power-on signal is invalid, after waiting for a preset time, monitoring a second signal, the second signal being used to confirm whether the engine controller has received the vehicle speed message;

[0096] S306: When it is determined according to the second signal that the engine controller has received the vehicle speed message, it is determined that a signal transmission line failure exists in the engine controller.

[0097] In this embodiment, the process of confirming whether the engine controller has a fault based on the second signal is as follows: the fault diagnosis device confirms whether the engine controller has received the vehicle speed message based on the second signal, and when it is determined that the engine controller has received the vehicle speed message, confirms that there is a signal transmission line fault in the engine controller.

[0098] Specifically, during normal operation of the construction machinery, the instrumentation of the construction machinery also monitors the power-on signal and, if it detects a valid power-on signal, sends a speed message to the engine controller. Therefore, if the engine controller is confirmed to have received the speed message, it indicates that the power-on signal monitored by the instrumentation is also valid. Therefore, it can be determined that the construction machinery key is currently in the ON position. Therefore, the engine controller's failure to detect the power-on signal is due to an abnormality in its signal transmission line, thus confirming a fault in the engine controller's signal transmission line.

[0099] In this embodiment, the fault diagnosis device can re-determine whether the power-on signal is invalid based on whether the engine controller receives the vehicle speed message, that is, re-determine whether the key is in the ON position. In this way, it can quickly determine whether the engine is shut down normally and whether the abnormal engine shutdown is caused by a fault in the signal transmission line of the engine controller, thereby avoiding the situation where the engine is abnormally shut down due to an abnormal signal transmission line of the engine controller.

[0100] Figure 4 A schematic flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention is shown. The method comprises:

[0101] S402, when confirming that the power-on signal input to the engine controller is valid, wait for a preset time and then monitor the second signal;

[0102] S404, confirming the operating status of the construction machinery according to the second signal;

[0103] S406, when the construction machine is in the first state, monitoring a first signal, the first signal being used to confirm whether a power-on signal input to the engine controller is valid;

[0104] S408, when the power-on signal is invalid, after waiting for a preset time, monitoring a second signal, the second signal being used to confirm whether the engine controller has received the vehicle speed message;

[0105] S410: Determine whether the engine controller has a fault according to the second signal.

[0106] In this technical aspect, before monitoring the first signal, the fault diagnosis device needs to determine the operating status of the engineering machinery, that is, whether the engineering machinery is powered on normally and whether the communication bus of the engineering machinery is normal.

[0107] Specifically, the fault diagnosis device first determines whether the power-on signal input to the engine controller is valid. Specifically, the fault diagnosis device can indirectly determine whether the entire construction machinery vehicle is powered on normally by determining whether the power-on signal input to the engine controller is valid.

[0108] Specifically, if the power-on signal input to the engine controller is valid, it indicates that the entire construction machinery vehicle is powered on normally; if the power-on signal input to the engine controller is invalid, it indicates that the entire construction machinery vehicle is not powered on.

[0109] Furthermore, the fault diagnosis device can also determine whether the entire construction machinery vehicle is powered on normally by determining whether the power-on signal detected by the instrument device is valid.

[0110] Furthermore, when it is confirmed that the power-on signal input to the engine controller is valid, that is, when it is confirmed that the entire engineering machinery is powered on normally, after waiting for a preset period of time, it is determined whether the communication bus of the engineering machinery is normal by monitoring the second signal.

[0111] Specifically, when confirming that the entire construction machinery is powered on normally, by confirming whether the communication bus of the construction machinery is normal, it can be determined whether the construction machinery is in a normal operating state or an abnormal operating state. In the subsequent steps, the fault diagnosis device will only diagnose whether the engine stall is caused by an engine controller failure by monitoring the first signal and the second signal when the construction machinery is in a normal operating state, thereby avoiding meaningless fault diagnosis.

[0112] It should be noted that, since the order in which the power-on signals are sent to the engine controller and the instrument device is inconsistent when the key is in the ON position, that is, the power-on timing of the two is inconsistent, the instrument device may send a vehicle speed message to the engine controller slower than the engine controller detects that the power-on signal is valid. Therefore, in order to avoid wrong judgment, the fault diagnosis device needs to wait for a preset time before monitoring the second signal after determining that the power-on signal input to the engine controller is valid. In this way, wrong judgment of the operating status of the construction machinery is avoided and the accuracy of the judgment of the operating status of the construction machinery is guaranteed.

[0113] In this embodiment, before monitoring the first signal, the fault diagnosis detection device also needs to determine the operating status of the engineering machinery by determining whether the power supply of the entire engineering machinery is normal and whether the communication bus of the engineering machinery is normal. In this way, it is ensured that in the subsequent steps, the fault diagnosis device performs fault diagnosis on the engine controller when the engineering machinery is in normal operating state (corresponding to the above-mentioned first state), that is, when the engineering machinery meets the fault diagnosis requirements, thereby avoiding meaningless fault diagnosis of the engineering machinery.

[0114] Figure 5 A schematic flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention is shown. The method comprises:

[0115] S502, when confirming that the power-on signal input to the engine controller is valid, wait for a preset time and then monitor the second signal;

[0116] S504, when it is determined according to the second signal that the engine controller has received the vehicle speed message, confirming that the construction machine is in the first state;

[0117] S506, when the construction machine is in the first state, monitoring a first signal, where the first signal is used to confirm whether a power-on signal input to the engine controller is valid;

[0118] S508, when the power-on signal is invalid, after waiting for a preset time, monitoring a second signal, the second signal being used to confirm whether the engine controller has received the vehicle speed message;

[0119] S510: Determine whether the engine controller has a fault according to the second signal.

[0120] In this embodiment, the process of confirming the operating status of the construction machinery according to the second signal is as follows: the fault diagnosis device confirms whether the engine controller has received the vehicle speed message according to the second signal, and confirms that the construction machinery is in the first state when it is determined that the engine controller has received the vehicle speed message.

[0121] Specifically, when the construction machinery is operating normally, the instrument device will send a vehicle speed message to the engine controller through the communication bus. Therefore, if it is determined that the engine controller has received the vehicle speed message, it means that the communication bus can transmit information, that is, it can be clearly seen that there is no abnormality in the communication bus of the construction machinery. At this time, it can be determined that the entire construction machinery is powered on normally, and the communication bus of the construction machinery is also in a normal state, so it can be determined that the construction machinery is in the first state.

[0122] In this embodiment, the fault diagnosis device determines that the construction machine's communication bus is normal after the engine controller receives the vehicle speed message, and further determines that the construction machine is in the first state. This ensures that in subsequent steps, the fault diagnosis device performs fault diagnosis on the engine controller when the construction machine is in the first state, that is, when the construction machine meets the fault diagnosis requirements, thereby avoiding meaningless fault diagnosis of the construction machine.

[0123] Figure 6 A schematic flow chart of a method for diagnosing a fault of an engineering machine according to an embodiment of the present invention is shown. The method comprises:

[0124] S602, when confirming that the power-on signal input to the engine controller is valid, wait for a preset time and then monitor the second signal;

[0125] S604: If it is determined according to the second signal that the engine controller has not received the vehicle speed message, confirm that the construction machine is not in the first state and that a fault exists in the communication bus of the construction machine;

[0126] S606, when it is determined according to the second signal that the engine controller has received the vehicle speed message, confirming that the construction machine is in the first state;

[0127] S608, when the construction machine is in the first state, monitoring a first signal, the first signal being used to confirm whether a power-on signal input to the engine controller is valid;

[0128] S610, when the power-on signal is invalid, after waiting for a preset time, monitoring a second signal, the second signal being used to confirm whether the engine controller has received the vehicle speed message;

[0129] S612: Determine whether the engine controller has a fault according to the second signal.

[0130] In this embodiment, the process of confirming the operating status of the construction machinery based on the second signal is: the fault diagnosis device confirms whether the engine controller has received the vehicle speed message based on the second signal, and when it is determined that the engine controller has not received the vehicle speed message, it confirms that the construction machinery is not in the first state, and it can be determined that there is a fault in the communication bus of the construction machinery.

[0131] Specifically, when the construction machinery is operating normally, the instrument device will send a vehicle speed message to the engine controller through the communication bus. Therefore, if it is determined that the engine controller has not received the vehicle speed message, it means that the communication bus cannot transmit information, and it can be determined that there may be a fault in the communication bus. At this time, it can be determined that the entire construction machinery is powered on normally, but there may be a fault in the communication bus of the construction machinery, so it can be determined that the construction machinery is not in the first state.

[0132] In this embodiment, if the fault diagnosis device determines that the engine controller has not received the vehicle speed message, it determines that there is an abnormality in the construction machine's communication bus, and further determines that the construction machine is not in the first state. This prevents the fault diagnosis device from continuing to perform subsequent steps to diagnose the engine controller's fault. This ensures that the fault diagnosis device performs fault diagnosis on the engine controller when the construction machine is in the first state, that is, when the construction machine meets the fault diagnosis requirements, thereby avoiding meaningless fault diagnosis of the construction machine.

[0133] Example 2:

[0134] Figure 7 A schematic block diagram of a fault diagnosis device for engineering machinery according to an embodiment of the present invention is shown, wherein the engineering machinery includes an engine controller, and the fault diagnosis device 700 for engineering machinery includes: a first processing module 702, for monitoring a first signal when the engineering machinery is in a first state, the first signal being used to confirm whether a power-on signal input to the engine controller is valid; a second processing module 704, for monitoring a second signal after waiting for a first preset time period when the power-on signal is invalid, the second signal being used to confirm whether the engine controller receives a vehicle speed message; a third processing module 706, for confirming whether there is a fault in the engine controller based on the second signal; wherein the first state is a state in which the engineering machinery is powered on normally and the communication bus of the engineering machinery is normal.

[0135] In this embodiment, the engineering machinery includes an engine controller, the first signal can be used to determine whether a power-on signal input to the engine controller is valid, and the second signal can be used to determine whether the engine controller receives a vehicle speed message.

[0136] Specifically, the first processing module 702 first determines whether the construction machine is in the first state. If the construction machine is in the first state, it monitors the first signal, that is, determines whether the power-on signal input to the engine controller is valid. Specifically, if the construction machine is in the first state, it indicates that the construction machine is powered on normally and the construction machine's communication bus is communicating normally. In this case, fault monitoring and diagnosis of the construction machine are meaningful.

[0137] Specifically, a valid power-on signal will only be generated when the key of the construction machinery is in the ON position. When the power-on signal is valid, the engine controller will detect the signal that the key is in the ON position. Therefore, the first processing module 702 can determine whether the power-on signal input to the engine controller is valid by determining whether the engine controller detects the signal that the key is in the ON position.

[0138] Furthermore, when the first processing module 702 determines that the power-on signal input to the engine controller is invalid, that is, the engine controller does not detect the signal that the key is in the ON position, the second processing module 704 waits for a preset period of time and then monitors the second signal used to confirm whether the engine controller receives the vehicle speed message.

[0139] Specifically, if the engine controller does not detect the signal that the key is in the ON position, it indicates that the key of the construction machinery may not be in the ON position at this time, so the second processing module 704 needs to monitor the second signal to further confirm whether the engine controller has received the vehicle speed message to determine whether there is a fault in the transmission signal of the power-on signal of the engine controller.

[0140] It should be noted that, since when the key is in the off position, the order in which the power-off signals are sent to the engine controller and the instrument device is inconsistent, that is, the power-off timing of the two is inconsistent, resulting in the instrument device stopping sending the vehicle speed message to the engine controller slower than the engine controller detecting that the power-on signal is invalid. Therefore, in order to avoid misjudgment, the second processing module 704 needs to wait for a preset period of time before monitoring the second signal when it determines that the power-on signal input to the engine controller is invalid. In this way, misjudgment of engine controller failure is avoided and the accuracy of fault diagnosis is ensured.

[0141] Furthermore, the third processing module 706 determines whether there is a fault in the engine controller based on the aforementioned second signal. Specifically, during normal operation of the construction machinery, the instrumentation of the construction machinery also monitors the power-on signal and, if the power-on signal is valid, transmits a speed message to the engine controller. Therefore, the third processing module 706 can further determine whether the key is in the ON position based on whether the engine controller receives the speed message. This allows for rapid troubleshooting and identification of the fault location in the event of an abnormal engine shutdown.

[0142] In this embodiment, after confirming that the construction machinery is in the first state, the first processing module 702 monitors the first signal. When it is determined based on the first signal that the power-on signal input to the engine controller is invalid, the third processing module 706 can confirm whether the engine controller is faulty based on the second signal monitored by the second processing module 704. In an embodiment of the present invention, when it is determined that the power-on signal input to the engine controller is invalid, the third processing module 706 can further confirm whether the power-on signal of the construction machinery is invalid based on whether the engine controller has received a vehicle speed message, that is, confirm whether the key is in the ON position. This allows for rapid troubleshooting and identification of the fault location when the engine abnormally shuts down, facilitating rapid maintenance and ensuring the reliability of the construction machinery's operation. Furthermore, in the above embodiment, the third processing module 706 is also configured to determine that the engine controller is not faulty when it is determined based on the second signal that the engine controller has not received a vehicle speed message.

[0143] Furthermore, in the above embodiment, the third processing module 706 is further configured to determine that a signal transmission line fault exists in the engine controller when it is determined according to the second signal that the engine controller has received the vehicle speed message.

[0144] Furthermore, in the above embodiment, the first processing module 702 is also used to monitor the second signal after waiting for a preset time when confirming that the power-on signal input to the engine controller is valid; and confirm the operating status of the engineering machinery according to the second signal.

[0145] Furthermore, in the above embodiment, the first processing module 702 is further configured to confirm that the construction machine is in the first state when it is determined according to the second signal that the engine controller has received the vehicle speed message.

[0146] Furthermore, in the above embodiment, the first processing module 702 is further configured to confirm that the construction machinery is not in the first state and that a fault exists in the communication bus of the construction machinery when it is determined according to the second signal that the engine controller has not received the vehicle speed message.

[0147] Example 3:

[0148] Figure 8 A schematic block diagram of a fault diagnosis device for a tunnel boring machine according to an embodiment of the present invention is shown. The fault diagnosis device 800 for engineering machinery includes: a memory 802, in which a program or instruction is stored; a processor 804, which executes the program or instruction stored in the memory 802 to implement the steps of the fault diagnosis method for engineering machinery proposed in the above embodiment of the present invention, and thus has all the beneficial technical effects of the fault diagnosis method for engineering machinery proposed in the above embodiment of the present invention, which will not be further elaborated here.

[0149] Example 4:

[0150] According to a fourth embodiment of the present invention, a readable storage medium is provided, which stores a program or instructions. When executed by a processor, the program or instructions implement the engineering machinery fault diagnosis method proposed in the above-mentioned embodiments of the present invention. Therefore, the readable storage medium has all the beneficial effects of the engineering machinery fault diagnosis method proposed in the above-mentioned embodiments of the present invention, and no further details are given here.

[0151] Embodiment 5:

[0152] According to the fifth embodiment of the present invention, an engineering machinery is proposed, including the fault diagnosis device for engineering machinery proposed in the above embodiment of the present invention, and / or the readable storage medium proposed in the above embodiment of the present invention. Therefore, the engineering machinery has all the beneficial effects of the fault diagnosis device for engineering machinery proposed in the above embodiment of the present invention and / or the readable storage medium proposed in the above embodiment of the present invention, which will not be repeated here.

[0153] For example, the above-mentioned engineering machinery may include heavy trucks, trailers, excavators, anchor diggers, bulldozers, road rollers, concrete pump trucks and other working vehicles. The above-mentioned engineering machinery may also include mechanical operating equipment such as tower cranes, construction elevators and material hoists.

[0154] Example 6:

[0155] This embodiment combines Figure 9 The fault diagnosis method for engineering machinery proposed in the present invention is exemplified.

[0156] like Figure 9 As shown, the fault diagnosis method of the engineering machinery includes:

[0157] S902, confirm whether the power-on signal input to the engine controller is valid; if yes, execute S904, otherwise, execute S902 again;

[0158] S904, wait for 2 seconds;

[0159] S906, confirm whether the engine controller has received the vehicle speed message; if yes, proceed to S908, otherwise, end this process;

[0160] S908, confirm whether the power-on signal input to the engine controller is invalid; if yes, execute S910, otherwise, execute S908 again;

[0161] S910, wait 2 seconds;

[0162] S912, confirm whether the engine controller has not received the vehicle speed message; if yes, end this process, otherwise execute S914;

[0163] S914: Confirm that the signal transmission line of the engine controller is faulty.

[0164] In this embodiment, the fault diagnosis device first confirms whether the power-on signal input to the engine controller is valid, that is, confirms whether the power-on of the entire construction machinery is normal.

[0165] Furthermore, after confirming that the power-on signal input to the engine controller is valid, wait for 2 seconds (in this embodiment, the preset time length is set to 2 seconds) to confirm whether the engine controller receives the vehicle speed message, that is, confirm whether the communication bus communication of the construction machinery is normal.

[0166] Furthermore, when it is confirmed that the engine controller has received the vehicle speed message, a diagnosis is performed to determine whether there is a signal transmission line fault in the engine controller.

[0167] Specifically, the fault diagnosis device first confirms whether the power-on signal input to the engine controller is invalid; if it is confirmed that the power-on signal input to the engine controller is invalid, it waits for 2 seconds to confirm whether the engine controller has not received the vehicle speed message.

[0168] Furthermore, when it is confirmed that the engine controller receives the vehicle speed message, that is, when the power-on signal input to the engine controller is invalid and the engine controller receives the vehicle speed message, it is confirmed that the signal transmission line of the engine controller is faulty.

[0169] In this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, unless otherwise expressly specified or limited. Terms such as "connect," "install," and "fix" should be interpreted broadly. For example, "connect" can refer to a fixed connection, a detachable connection, or an integral connection; and can be directly connected or indirectly connected through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0170] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0171] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0172] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fault diagnosis method for an engineering machine, wherein the engineering machine includes an engine controller, characterized in that: The fault diagnosis method comprises: When the engineering machine is in a first state, monitoring a first signal, wherein the first signal is used to confirm whether a power-on signal input to the engine controller is valid; In the case where the power-on signal is invalid, after waiting for a preset time, monitoring a second signal, wherein the second signal is used to confirm whether the engine controller has received the vehicle speed message; confirming whether the engine controller has a fault according to the second signal; and determining whether a transmission signal of a power-on signal of the engine controller has a fault according to whether the engine controller has received the vehicle speed message; The first state is a state in which the engineering machinery is powered on normally and the communication bus of the engineering machinery is normal; The confirming whether the engine controller has a fault according to the second signal specifically includes: If it is determined according to the second signal that the engine controller has not received the vehicle speed message, determining that there is no fault in the engine controller; When it is determined according to the second signal that the engine controller has received the vehicle speed message, it is determined that a signal transmission line failure exists in the engine controller.

2. The fault diagnosis method for engineering machinery according to claim 1, characterized in that: When the engineering machine is in the first state, before monitoring the first signal, the fault diagnosis method further includes: When confirming that the power-on signal input to the engine controller is valid, monitoring the second signal after waiting for the preset time period; The operating status of the construction machine is confirmed according to the second signal.

3. The fault diagnosis method for engineering machinery according to claim 2, characterized in that: Confirming the operating status of the engineering machinery according to the second signal specifically includes: When it is determined according to the second signal that the engine controller has received the vehicle speed message, it is confirmed that the construction machine is in the first state.

4. The fault diagnosis method for construction machinery according to claim 2, characterized in that: Confirming the operating status of the engineering machinery according to the second signal specifically includes: When it is determined according to the second signal that the engine controller has not received the vehicle speed message, it is confirmed that the engineering machine is not in the first state and a fault exists in the communication bus of the engineering machine.

5. A fault diagnosis device for an engineering machine, the engineering machine including an engine controller, characterized in that: The fault diagnosis device comprises: a first processing module, configured to monitor a first signal when the engineering machine is in a first state, wherein the first signal is used to confirm whether a power-on signal input to the engine controller is valid; a second processing module, configured to monitor a second signal after waiting for a first preset time period when the power-on signal is invalid, wherein the second signal is used to confirm whether the engine controller has received the vehicle speed message; a third processing module, configured to determine whether the engine controller has a fault according to the second signal; and determine whether a transmission signal of a power-on signal of the engine controller has a fault according to whether the engine controller has received the vehicle speed message; The first state is a state in which the engineering machinery is powered on normally and the communication bus of the engineering machinery is normal; The third processing module is further configured to determine that there is no fault in the engine controller when it is determined according to the second signal that the engine controller has not received the vehicle speed message; The third processing module is further configured to determine that a signal transmission line fault exists in the engine controller when it is determined according to the second signal that the engine controller has received the vehicle speed message.

6. A fault diagnosis device for engineering machinery, characterized in that: include: A memory and a processor, wherein the memory stores a program, and when the processor executes the program, the steps of the engineering machinery fault diagnosis method according to any one of claims 1 to 4 are implemented.

7. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the fault diagnosis method for engineering machinery according to any one of claims 1 to 4 are implemented.

8. An engineering machine, characterized in that: include: The fault diagnosis device for engineering machinery according to claim 5 or 6; and / or The readable storage medium according to claim 7.

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