Methods and devices for detecting abnormalities in methanol fuel supply systems and for new energy vehicles

Abstract

This invention discloses a method, device, and new energy vehicle for detecting anomalies in a methanol fuel supply system. The method includes: performing power-on anomaly detection on a pump relay; controlling the operation of the methanol fuel supply system based on the power-on anomaly detection result; acquiring fuel-related parameters during the operation of the methanol fuel supply system; wherein the fuel-related parameters include at least one of the following: fuel rail pressure parameters, injection valve parameters, engine speed parameters, and fuel tank level parameters; determining whether to apply a relay open-circuit detection condition based on the fuel-related parameters; and performing open-circuit fault detection on the pump relay based on the relay open-circuit detection condition. This invention identifies methanol pump anomalies through power-on detection and fuel supply detection, actively applies relay open-circuit detection conditions, promptly detects relay open-circuit anomalies, prevents untimely reporting of methanol pump malfunctions, and improves the accuracy of fuel supply system detection results.

Description

Technical Field

[0001] This invention relates to the field of engine testing technology, and in particular to a method, device, and new energy vehicle for detecting abnormalities in a methanol fuel supply system. Background Technology

[0002] Methanol has advantages such as low cost and low carbon emissions, making it a relatively ideal alternative fuel for engines. Methanol engines are gradually being introduced to the market. Methanol fuel is supplied via a methanol pump. Because the methanol pump operates at a relatively high current, exceeding the range directly controlled by the controller, an ECU (Electronic Control Unit) is typically used to control the pump relay to achieve on / off control of the methanol pump.

[0003] In the existing methanol pump control strategy, the pump relay immediately drives the methanol pump to start after the engine power switch T15 is powered on, and the methanol pump remains operational throughout vehicle operation, only being disconnected when the engine stops running. Because fault diagnosis for open circuits in the relay needs to be performed when the methanol pump is not running, it cannot promptly report faults when the methanol pump malfunctions (such as failing to supply methanol fuel normally). This results in the inability to cut off the injection valve drive in time when methanol fuel supply is abnormal, potentially leading to abnormal situations such as injection valve burnout. Summary of the Invention

[0004] This invention provides a method, device, and new energy vehicle for detecting abnormalities in a methanol fuel supply system, in order to solve the problem that existing methanol pump control strategies cannot report faults in a timely manner when the methanol pump is malfunctioning, resulting in the inability to cut off the injection valve drive in time and easily causing abnormal situations such as injection valve burnout. This invention can detect methanol pump faults in a timely manner.

[0005] According to one aspect of the present invention, a method for detecting anomalies in a methanol fuel supply system is provided. The methanol fuel supply system includes a methanol pump, a pump relay, and an injection valve. The method includes: performing power-on anomaly detection on the pump relay; controlling the operation of the methanol fuel supply system based on the power-on anomaly detection result; acquiring fuel-related parameters during the operation of the methanol fuel supply system; wherein the fuel-related parameters include at least one of the following: fuel rail pressure parameters, injection valve parameters, engine speed parameters, and fuel tank level parameters; determining whether to apply a relay open-circuit detection condition based on the fuel-related parameters; and performing open-circuit fault detection on the pump relay based on the relay open-circuit detection condition.

[0006] Optionally, determining whether to apply the relay open-circuit detection condition based on the fuel correlation parameters includes: determining whether the rail pressure sensor is working properly; if the rail pressure sensor is working properly, then determining whether to apply the relay open-circuit detection condition based on the fuel rail pressure parameters.

[0007] Optionally, determining whether to apply the relay open-circuit detection condition based on the fuel-related parameters includes: determining whether the injection valve is in the injection state based on the injection valve parameters; if the injection valve is in the injection state, determining whether to apply the relay open-circuit detection condition based on the engine speed parameters or the fuel tank level parameters.

[0008] Optionally, the step of performing open-circuit fault detection on the pump relay based on the relay open-circuit detection condition includes: controlling the pump relay to be de-energized; acquiring the voltage parameters of the pump relay in the de-energized state; and determining whether the pump relay has an open-circuit fault based on the voltage parameters.

[0009] Optionally, the power-on abnormality detection of the pump relay includes at least: relay open circuit fault.

[0010] Optionally, controlling the operation of the methanol fuel supply system based on the power-on anomaly detection result includes: when there is no power-on anomaly, controlling the pump relay to power on so as to drive the methanol pump to start working.

[0011] Optionally, after performing open-circuit fault detection on the pump relay based on the open-circuit detection condition, the method further includes: controlling the injection valve to operate or stop operating according to the open-circuit fault detection result; and / or issuing a corresponding warning message according to the open-circuit fault detection result; wherein the warning message includes at least one of the following: relay open-circuit fault or abnormal fuel supply.

[0012] Optionally, the methanol fuel supply system anomaly detection method further includes: after identifying the fuel supply anomaly, conducting anomaly investigation on the lines or fuel supply pipelines of the methanol fuel supply system, and determining the cause of the anomaly based on the anomaly investigation results.

[0013] According to another aspect of the present invention, a methanol fuel supply system anomaly detection device is provided. The methanol fuel supply system includes a methanol pump, a pump relay, and an injection valve. The device is used to execute the aforementioned methanol fuel supply system anomaly detection method. The methanol fuel supply system anomaly detection device includes: a power-on detection module for detecting power-on anomalies in the pump relay; a drive control module for controlling the operation of the methanol fuel supply system based on the power-on anomaly detection result; a parameter acquisition module for acquiring fuel-related parameters during the operation of the methanol fuel supply system; wherein the fuel-related parameters include at least one of the following: fuel rail pressure parameters, injection valve parameters, engine speed parameters, and fuel tank level parameters; a fault detection decision module for determining whether to apply a relay open-circuit detection condition based on the fuel-related parameters; and a fault detection execution module for performing open-circuit fault detection on the pump relay based on the relay open-circuit detection condition.

[0014] According to another aspect of the present invention, a new energy vehicle is provided, comprising: an engine body, and the aforementioned methanol fuel supply system anomaly detection device; the methanol fuel supply system anomaly detection device is configured to: perform power-on anomaly detection on the pump relay; control the operation of the methanol fuel supply system based on the power-on anomaly detection result; acquire fuel-related parameters during the operation of the methanol fuel supply system; determine whether to apply a relay open-circuit detection condition based on the fuel-related parameters; and perform open-circuit fault detection on the pump relay based on the relay open-circuit detection condition.

[0015] The technical solution of this invention identifies methanol pump malfunctions by configuring power-on detection and fuel supply detection. When the methanol pump malfunctions, a relay open-circuit detection condition is actively applied to promptly detect the relay open-circuit malfunction. This solves the problem that existing methanol pump control strategies cannot report faults in a timely manner when the methanol pump is malfunctioning, which leads to the inability to cut off the injection valve drive in time and easily causes abnormal situations such as injection valve burnout. This prevents the methanol pump from failing to report faults in time and improves the accuracy of the fuel supply system detection results.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of an anomaly detection method for a methanol fuel supply system provided in Embodiment 1 of the present invention;

[0019] Figure 2 A flowchart of another method for detecting anomalies in a methanol fuel supply system provided in Embodiment 1 of the present invention;

[0020] Figure 3 A flowchart of another method for detecting anomalies in a methanol fuel supply system provided in Embodiment 1 of the present invention;

[0021] Figure 4 The flowchart shows an open-circuit fault detection method based on relay open-circuit detection conditions provided in Embodiment 1 of the present invention.

[0022] Figure 5A flowchart of another method for detecting anomalies in a methanol fuel supply system provided in Embodiment 1 of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of an abnormal detection device for a methanol fuel supply system provided in Embodiment 2 of the present invention;

[0024] Figure 7 This is a structural schematic diagram of a new energy vehicle provided in Embodiment 3 of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] Example 1

[0028] Figure 1 This is a flowchart of a methanol fuel supply system anomaly detection method provided in Embodiment 1 of the present invention. This embodiment can be applied to the application scenario of methanol fuel engine anomaly detection. The methanol fuel engine uses a relay to control the methanol pump to supply methanol fuel. The method can be executed by a methanol fuel supply system anomaly detection device. The methanol fuel supply system anomaly detection device can be implemented in hardware and / or software. The methanol fuel supply system anomaly detection device can be configured in the methanol vehicle control system.

[0029] In this application, the methanol fuel supply system includes at least a methanol pump, a pump relay, and an injection valve. The pump relay is connected to the engine control unit (ECU). The pump relay is used to control the methanol pump to be powered on or off according to the drive signal output by the engine control unit. The engine control unit is also used to drive the injection valve to start or stop injecting methanol fuel.

[0030] See Figure 1 As shown, the abnormal detection method for the methanol fuel supply system specifically includes the following steps:

[0031] S1: Perform power-on abnormality detection on the pump relay.

[0032] In this embodiment, the pump relay is connected to the engine controller via both a high-side drive circuit and a low-side drive circuit to receive the drive signal output by the engine controller.

[0033] Optionally, the power-on fault detection of the pump relay includes at least: relay open-circuit fault detection. Specifically, after the methanol fuel engine starts or the methanol fuel supply system is powered on, the open-circuit fault detection of the pump relay is initiated.

[0034] In some embodiments, the open circuit fault detection during the power-on abnormality detection process includes: maintaining the pump relay de-energized, detecting the low-side voltage of the pump relay, and if the low-side voltage of the pump relay is high, then it is determined that there is an open circuit fault in the relay.

[0035] S2: Control the operation of the methanol fuel supply system based on the power-on anomaly detection results.

[0036] In this embodiment, if a power-on abnormality is detected (such as a relay open circuit fault), the methanol fuel supply system is controlled not to start. At this time, the methanol pump, pump relay, and injection valve are all de-energized. If no power-on abnormality is detected (such as no relay open circuit fault), the methanol fuel supply system is controlled to start working.

[0037] Optionally, the operation of the methanol fuel supply system can be controlled based on the power-on anomaly detection result, including: when no power-on anomaly is detected, controlling the pump relay to energize and drive the methanol pump to start operation. Specifically, if an open-circuit fault is detected in the relay, the drive signal of the injection valve is cut off; if no open-circuit fault is detected in the relay, the pump relay is energized and the methanol pump is driven to operate.

[0038] S3: Obtain fuel-related parameters during the operation of the methanol fuel supply system.

[0039] Optionally, the fuel-related parameters include at least one of the following: fuel rail pressure parameters, injection valve parameters, engine speed parameters, and fuel tank level parameters. The fuel rail pressure parameters include, but are not limited to, the engine fuel common rail pressure. In this embodiment, a pressure sensor can be installed on the high-pressure fuel rail to collect the fuel rail pressure parameters. The injection valve parameters include, but are not limited to, any one or more combinations of the injection valve's drive signal or injection state. The engine speed parameters include, but are not limited to, any one or more combinations of engine speed value, speed change value, or speed change rate. The fuel tank level parameters include, but are not limited to, any one or more combinations of fuel tank level value, level change value, or level change rate.

[0040] S4: Determine whether to apply relay open-circuit detection conditions based on fuel-related parameters.

[0041] The relay open-circuit detection condition is used to cut off the pump relay drive circuit. The relay open-circuit detection conditions include, but are not limited to: the engine controller not outputting a pump drive signal, or the pump relay being de-energized.

[0042] In this embodiment, determining whether to apply the relay open-circuit detection condition based on fuel correlation parameters includes: identifying whether the methanol fuel supply system is abnormal based on the fuel correlation parameters; if the methanol fuel supply system is abnormal, actively applying the relay open-circuit detection condition; if the methanol fuel supply system is not abnormal, not applying the relay open-circuit detection condition, and driving the injection valve to execute the normal injection request after receiving the injection request signal.

[0043] S5: Perform open circuit fault detection on the pump relay based on the relay open circuit detection condition.

[0044] The open circuit fault detection includes, but is not limited to, open circuits in the wiring harness between the relay and the methanol pump or open circuits in the relay contacts.

[0045] In this embodiment, the open-circuit fault detection of the pump relay based on the relay open-circuit detection condition includes at least: after actively applying the relay open-circuit detection condition, controlling the pump relay to de-energize, and then diagnosing whether the pump relay has an open-circuit fault.

[0046] Specifically, after the methanol fuel engine starts, an open-circuit fault detection of the pump relay is initiated first. If an open-circuit fault is reported in the pump relay, the injection valve drive is cut off. If the pump relay is fault-free, the pump relay is energized to drive the methanol pump. During the operation of the methanol pump, fuel-related parameters such as fuel rail pressure, injection valve parameters, engine speed parameters, and fuel tank level parameters are acquired. Based on these parameters, it is determined whether there is an abnormality in the methanol fuel supply system. If there is no abnormality in the methanol fuel supply system, the relay open-circuit detection condition is not applied, and the injection valve is driven to execute the normal injection request. If there is an abnormality in the methanol fuel supply system, the relay open-circuit detection condition is actively applied to diagnose whether there is an open-circuit fault in the pump relay. By configuring power-on detection and fuel supply detection to identify methanol pump abnormalities, and actively applying the relay open-circuit detection condition when the methanol pump is abnormal, the relay open-circuit fault can be detected in a timely manner. This solves the problem that the existing methanol pump control strategy cannot report faults in a timely manner when the methanol pump is malfunctioning, which leads to the inability to cut off the injection valve drive in time and easily causes abnormalities such as injection valve burnout. This prevents the methanol pump from failing to report faults in time and improves the accuracy of fuel supply system detection results.

[0047] Figure 2 This is a flowchart of another method for detecting anomalies in a methanol fuel supply system provided in Embodiment 1 of the present invention. Figure 1 Based on the illustrated embodiment, a specific implementation method for actively applying relay open-circuit detection conditions is provided.

[0048] See Figure 2 As shown, the abnormal detection method for the methanol fuel supply system includes the following steps:

[0049] S201: Perform power-on abnormality detection on the pump relay.

[0050] S202: Control the operation of the methanol fuel supply system based on the power-on anomaly detection results.

[0051] S203: Obtain fuel-related parameters during the operation of the methanol fuel supply system.

[0052] S204: Determine if the rail pressure sensor is working properly.

[0053] If the rail pressure sensor malfunctions, proceed to step S205; if the rail pressure sensor functions normally, proceed to step S206.

[0054] S205: Report rail pressure sensor malfunction.

[0055] In this embodiment, rail pressure sensor malfunctions can be monitored and diagnosed through the rail pressure sensor status flag bit or the rail pressure sensor output signal. The rail pressure sensor is connected to the engine controller. If a rail pressure sensor malfunction occurs, a string or corresponding message carrying the rail pressure sensor's operating status can be generated and reported to the engine controller.

[0056] S206: Determine whether to apply relay open-circuit detection conditions based on fuel rail pressure parameters.

[0057] In this embodiment, a preset rail pressure threshold and a preset time can be established using calibration data. Whether a fuel supply anomaly has occurred is diagnosed by determining whether the fuel rail pressure parameter remains below the preset rail pressure threshold for a preset time (e.g., 10 milliseconds). It should be noted that those skilled in the art can adjust the preset rail pressure threshold and preset time according to actual needs, and their specific values ​​are not limited.

[0058] S207: Perform open-circuit fault detection on the pump relay based on the relay open-circuit detection condition.

[0059] Specifically, steps S204 to S206 provide a control method for identifying fuel supply anomalies based on fuel rail pressure parameters and actively applying relay open-circuit detection conditions. After power-on detection and diagnosis confirming no open-circuit fault in the pump relay, the pump relay is energized to drive the methanol pump. During methanol pump operation, the engine fuel common rail pressure (i.e., fuel rail pressure parameter) is collected in real time. If the fuel rail pressure parameter remains below a preset rail pressure threshold for a preset time (e.g., 10 milliseconds), an active relay open-circuit detection condition is applied, controlling the pump relay to de-energize, thereby diagnosing whether the pump relay has an open-circuit fault. By observing the rail pressure to diagnose fuel supply anomalies and actively creating relay open-circuit fault detection conditions when a fuel supply anomaly is detected, the diagnostic strategy is simple and facilitates timely detection of methanol pump faults.

[0060] Figure 3 This is a flowchart of another method for detecting anomalies in a methanol fuel supply system provided in Embodiment 1 of the present invention. Figure 1 Based on the illustrated embodiment, another specific implementation method for actively applying relay open-circuit detection conditions is provided.

[0061] See Figure 3 As shown, determining whether to apply a relay open-circuit detection condition based on fuel-related parameters includes:

[0062] S301: Perform power-on abnormality detection on the pump relay.

[0063] S302: Control the operation of the methanol fuel supply system based on the power-on anomaly detection results.

[0064] S303: Obtain fuel-related parameters during the operation of the methanol fuel supply system.

[0065] S304: Determine whether the injection valve is in the injection state based on the injection valve parameters.

[0066] S305: When the injection valve is in the injection state, determine whether to apply the relay open circuit detection condition based on the engine speed parameter or the fuel tank level parameter.

[0067] In this embodiment, engine speed monitoring time and speed monitoring threshold, fuel tank level monitoring time and level monitoring threshold can be established using calibration data. The engine speed decrease during the engine speed monitoring time is compared with the speed monitoring threshold, or the fuel tank level change during the fuel tank level monitoring time is compared with the level monitoring threshold to diagnose whether an abnormal fuel supply has occurred. It should be noted that those skilled in the art can adjust the engine speed monitoring time and speed monitoring threshold, as well as the fuel tank level monitoring time and level monitoring threshold, according to actual needs; their specific values ​​are not limited.

[0068] S306: Perform open-circuit fault detection on pump relays based on relay open-circuit detection conditions.

[0069] Specifically, step S305 provides a control method for identifying fuel supply anomalies based on injection valve parameters, engine speed parameters, and fuel tank level parameters, and actively applying relay open-circuit detection conditions. After power-on detection and diagnosis confirming no open-circuit fault in the pump relay, the pump relay is energized to drive the methanol pump. During the operation of the methanol pump, the injection status of the injection valve is monitored in real time. If the injection valve is in the injection state and the engine speed change value is not up to standard (e.g., the engine speed drop exceeds the speed monitoring threshold within the engine speed monitoring time), or if the injection valve is in the injection state and the fuel tank level change value is not up to standard (e.g., the fuel tank level change value is below the fuel tank level monitoring threshold within the fuel tank level monitoring time), then a fuel supply anomaly is determined, and a relay open-circuit detection condition is actively applied, controlling the pump relay to de-energize, thereby diagnosing whether the pump relay has an open-circuit fault. By monitoring engine speed and fuel tank level to diagnose fuel supply anomalies, and actively creating relay open-circuit fault detection conditions when a fuel supply anomaly is detected, the diagnostic strategy is simple and facilitates timely detection of methanol pump faults.

[0070] Figure 4 This is a flowchart of an open-circuit fault detection method based on relay open-circuit detection conditions provided in Embodiment 1 of the present invention, which provides a specific implementation method for performing open-circuit fault detection on pump relays based on relay open-circuit detection conditions.

[0071] See Figure 4 As shown, the open-circuit fault detection method specifically includes the following steps:

[0072] S401: Perform power-on abnormality detection on the pump relay.

[0073] S402: Controls the operation of the methanol fuel supply system based on the power-on anomaly detection results.

[0074] S403: Obtain fuel-related parameters during the operation of the methanol fuel supply system.

[0075] S404: Determine whether to apply relay open-circuit detection conditions based on fuel-related parameters.

[0076] S405: Control pump relay de-energized.

[0077] In this embodiment, the strategy for controlling the pump relay to be de-energized includes, but is not limited to, the engine controller not outputting relay drive signals.

[0078] S406: Obtain the voltage parameters of the pump relay in the power-off state.

[0079] In this embodiment, the voltage parameter can be the low-side voltage of the pump relay.

[0080] S407: Determine whether the pump relay has an open circuit fault based on the voltage parameters.

[0081] Specifically, steps S405 to S407 describe a specific implementation of a relay open-circuit fault diagnosis strategy. When an anomaly occurs in the methanol fuel supply system, an open-circuit detection condition is actively applied to control the pump relay to be de-energized. The voltage parameters (such as low-side voltage) of the pump relay in the de-energized state are continuously monitored. If the low-side voltage of the pump relay in the de-energized state is at a high potential, it is determined that there is an open-circuit fault; if the low-side voltage of the pump relay in the de-energized state is at a low potential, it is determined that there is no open-circuit fault. By actively applying the open-circuit fault detection condition and combining it with relay low-side potential monitoring to identify methanol pump faults, it is easier to detect methanol pump faults in a timely manner, prevent the methanol pump from failing to report faults in a timely manner, and improve the accuracy of the fuel supply system detection results.

[0082] Figure 5 This is a flowchart of another method for detecting anomalies in a methanol fuel supply system provided in Embodiment 1 of the present invention. Figure 1 Based on the illustrated embodiment, the injection valve control logic has been optimized. See [link / reference] Figure 5 As shown, the specific steps for detecting anomalies in the methanol fuel supply system include:

[0083] S501: Perform power-on abnormality detection on the pump relay.

[0084] S502: Controls the operation of the methanol fuel supply system based on the power-on anomaly detection results.

[0085] S503: Obtain fuel-related parameters during the operation of the methanol fuel supply system.

[0086] S504: Determine whether to apply relay open-circuit detection conditions based on fuel-related parameters.

[0087] S505: Performs open-circuit fault detection on the pump relay based on the relay open-circuit detection condition.

[0088] S506: Control the injection valve to operate or stop operating based on the open circuit fault detection result, and / or issue a corresponding warning message based on the open circuit fault detection result. The warning message includes at least one of the following: relay open circuit fault or abnormal fuel supply.

[0089] Specifically, after actively applying the relay open-circuit detection condition, the control pump relay is de-energized to diagnose whether a relay open-circuit fault exists. If a relay open-circuit fault is detected, the injection valve drive is cut off, the injection valve stops working, and a relay open-circuit fault warning message is reported. If no relay open-circuit fault is detected, the injection valve drive is also cut off, and a fuel supply abnormality fault warning message is reported. By optimizing the injection valve control logic, injection is only released when fuel is detected in the fuel supply line, avoiding the problem of injection valve burnout caused by dry injection and improving system reliability. By setting up categorized warning logic, it is easier for drivers or test personnel to troubleshoot faults and facilitates later maintenance.

[0090] See Figure 5 As shown, the abnormal detection of this methanol fuel supply system also includes:

[0091] S507: After identifying an abnormality in fuel supply, conduct an anomaly investigation on the lines or pipelines of the methanol fuel supply system, and determine the cause of the anomaly based on the results of the anomaly investigation.

[0092] Optionally, wiring abnormalities in the methanol fuel supply system include, but are not limited to, open circuit abnormalities in the wiring harness between the pump relay and the methanol pump. Fuel supply line abnormalities include, but are not limited to, leaks in any area of ​​the fuel line between the methanol pump, common rail, or fuel injectors.

[0093] In this embodiment, wiring harness open circuit abnormalities can be identified by voltage or current detection, and pipeline leakage abnormalities can be identified by changes in pump oil pressure or engine speed. After identifying a fuel supply abnormality, the abnormality is diagnosed and reported by inspecting the lines or fuel supply lines of the methanol fuel supply system. This facilitates the rapid development of solutions based on the cause of the abnormality, improving the efficiency of fault diagnosis.

[0094] Example 2

[0095] Based on the same inventive concept, Embodiment 2 of the present invention provides a methanol fuel supply system anomaly detection device for performing the above-mentioned methanol fuel supply system anomaly detection method. The methanol fuel supply system of this embodiment includes at least a methanol pump, a pump relay and an injection valve.

[0096] Figure 6 This is a schematic diagram of the structure of a methanol fuel supply system anomaly detection device provided in Embodiment 2 of the present invention. See also... Figure 6 As shown, the methanol fuel supply system abnormality detection device 100 includes: a power-on detection module 101, a drive control module 102, a parameter acquisition module 103, a fault detection decision module 104, and a fault detection execution module 105.

[0097] See Figure 6 As shown, the power-on detection module 101 is used to detect power-on abnormalities in the pump relay; the drive control module 102 is used to control the operation of the methanol fuel supply system 1 based on the power-on abnormality detection result; the parameter acquisition module 103 is used to acquire fuel-related parameters during the operation of the methanol fuel supply system 1; wherein, the fuel-related parameters include at least one of the following: fuel rail pressure parameters, injection valve parameters, engine speed parameters, and fuel tank level parameters; the fault detection decision module 104 is used to determine whether to apply the relay open-circuit detection condition based on the fuel-related parameters; and the fault detection execution module 105 is used to perform open-circuit fault detection on the pump relay based on the relay open-circuit detection condition.

[0098] In some embodiments, the fault detection decision module 104 is configured to: determine whether the rail pressure sensor is working properly; if the rail pressure sensor is working properly, determine whether to apply a relay open circuit detection condition based on the fuel rail pressure parameters.

[0099] In other embodiments, the fault detection decision module 104 is configured to: determine whether the injection valve is in the injection state based on the injection valve parameters; if the injection valve is in the injection state, determine whether to apply the relay open circuit detection condition based on the engine speed parameters or the fuel tank level parameters.

[0100] Optionally, the fault detection execution module 105 is configured to: control the pump relay to de-energize; acquire the voltage parameters of the pump relay in the de-energized state; and determine whether the pump relay has an open circuit fault based on the voltage parameters.

[0101] Optionally, the abnormal power-on detection of the pump relay includes at least: relay open circuit fault.

[0102] Optionally, the drive control module 102 is configured to: control the pump relay to power on in the absence of a power-on abnormality, so as to drive the methanol pump to start working.

[0103] Optionally, the methanol fuel supply system abnormality detection device 100 further includes: an injection valve drive module and / or an alarm module. The injection valve drive module is used to control the injection valve to work or stop working based on the open circuit fault detection result; the alarm module is used to issue corresponding alarm information based on the open circuit fault detection result; wherein the alarm information includes at least one of the following: relay open circuit fault or fuel supply abnormality.

[0104] Optionally, the warning module is also used to investigate the abnormality of the methanol fuel supply system lines or fuel supply pipelines after an abnormality is detected, and to determine the cause of the abnormality based on the investigation results.

[0105] The methanol fuel supply system anomaly detection device provided in this embodiment of the invention can execute the methanol fuel supply system anomaly detection method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0106] Example 3

[0107] Based on the same inventive concept, Embodiment 3 of this invention provides a new energy vehicle, see [link / reference]. Figure 7 As shown, the new energy vehicle 200 includes: an engine body 201, and a methanol fuel supply system anomaly detection device 100 provided in the above embodiment.

[0108] In this embodiment, the engine body 201 is a methanol engine. The methanol fuel supply system anomaly detection device is configured to at least: perform power-on anomaly detection on the pump relay; control the methanol fuel supply system based on the power-on anomaly detection result; acquire fuel-related parameters during the operation of the methanol fuel supply system; determine whether to apply a relay open-circuit detection condition based on the fuel-related parameters; and perform open-circuit fault detection on the pump relay based on the relay open-circuit detection condition. By configuring power-on detection and fuel supply detection to identify methanol pump anomalies, and actively applying a relay open-circuit detection condition when the methanol pump is abnormal, the device promptly detects relay open-circuit anomalies. This solves the problem that existing methanol pump control strategies cannot promptly report faults when the methanol pump malfunctions, leading to failure to cut off the injection valve drive in time and potentially causing injection valve burnout or other abnormal situations. This prevents untimely reporting of methanol pump malfunctions and improves the operational stability of the new energy vehicle fuel supply system.

[0109] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0110] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting anomalies in a methanol fuel supply system, wherein the methanol fuel supply system includes a methanol pump, a pump relay, and an injection valve, characterized in that, include: Perform power-on anomaly detection on the pump relay; The operation of the methanol fuel supply system is controlled based on the power-on anomaly detection results. The fuel-related parameters during the operation of the methanol fuel supply system are obtained; wherein the fuel-related parameters include at least one of the following: fuel rail pressure parameters, injection valve parameters, engine speed parameters, and fuel tank level parameters; Determine whether to apply the relay open-circuit detection condition based on the fuel-related parameters; The pump relay is subjected to open circuit fault detection based on the aforementioned relay open circuit detection conditions.

2. The method for detecting anomalies in a methanol fuel supply system according to claim 1, characterized in that, The step of determining whether to apply a relay open-circuit detection condition based on the fuel correlation parameters includes: Determine if the rail pressure sensor is working properly; If the rail pressure sensor is working normally, then determine whether to apply the relay open-circuit detection condition based on the fuel rail pressure parameters.

3. The method for detecting anomalies in a methanol fuel supply system according to claim 1, characterized in that, The step of determining whether to apply a relay open-circuit detection condition based on the fuel correlation parameters includes: Determine whether the injection valve is in the injection state based on the injection valve parameters; If the injection valve is in the injection state, then it is determined whether to apply the relay open circuit detection condition based on the engine speed parameter or the fuel tank level parameter.

4. The method for detecting anomalies in a methanol fuel supply system according to claim 1, characterized in that, The step of performing open-circuit fault detection on the pump relay based on the relay open-circuit detection conditions includes: The pump relay is de-energized. Obtain the voltage parameters of the pump relay in the power-off state; Determine whether the pump relay has an open circuit fault based on the voltage parameters.

5. The method for detecting anomalies in a methanol fuel supply system according to claim 1, characterized in that, The abnormal power-on detection of the pump relay includes at least the following: relay open circuit fault.

6. The method for detecting anomalies in a methanol fuel supply system according to claim 1, characterized in that, The step of controlling the operation of the methanol fuel supply system based on the power-on anomaly detection result includes: In the absence of any power-on abnormality, the pump relay is powered on to drive the methanol pump to start operation.

7. The method for detecting anomalies in a methanol fuel supply system according to any one of claims 1 to 6, characterized in that, After performing open-circuit fault detection on the pump relay based on the open-circuit detection condition, the method further includes: controlling the injection valve to work or stop working according to the open-circuit fault detection result; and / or issuing a corresponding warning message according to the open-circuit fault detection result; The warning information includes at least one of the following: relay open circuit fault or abnormal fuel supply.

8. The method for detecting anomalies in a methanol fuel supply system according to claim 7, characterized in that, Also includes: After identifying the fuel supply anomaly, an anomaly investigation is conducted on the lines or pipelines of the methanol fuel supply system, and the cause of the anomaly is determined based on the investigation results.

9. A device for detecting abnormalities in a methanol fuel supply system, the methanol fuel supply system comprising a methanol pump, a pump relay, and an injection valve, characterized in that, For performing the methanol fuel supply system anomaly detection method according to any one of claims 1 to 8, the methanol fuel supply system anomaly detection device comprises: The power-on detection module is used to detect power-on abnormalities of the pump relay. The drive control module is used to control the operation of the methanol fuel supply system based on the power-on anomaly detection result; The parameter acquisition module is used to acquire fuel-related parameters during the operation of the methanol fuel supply system; wherein, the fuel-related parameters include at least one of the following: fuel rail pressure parameters, injection valve parameters, engine speed parameters, and fuel tank level parameters; The fault detection decision module is used to determine whether to apply the relay open circuit detection condition based on the fuel correlation parameters. The fault detection execution module is used to perform open-circuit fault detection on the pump relay based on the relay open-circuit detection conditions.

10. A new energy vehicle, characterized in that, include: The engine body, and the methanol fuel supply system anomaly detection device as described in claim 9; The methanol fuel supply system anomaly detection device is configured to: perform power-on anomaly detection on the pump relay; control the operation of the methanol fuel supply system based on the power-on anomaly detection result; acquire fuel-related parameters during the operation of the methanol fuel supply system; determine whether to apply relay open-circuit detection conditions based on the fuel-related parameters; and perform open-circuit fault detection on the pump relay based on the relay open-circuit detection conditions.

Images