A misfire fault information diagnosis method and device and a vehicle

Abstract

The application discloses a misfire fault information diagnosis method, device and vehicle, and is applied to a controller of a hybrid power system, wherein the hybrid power system at least comprises an engine and a generator; the diagnosis method comprises the following steps: obtaining a required torque value of the engine, a required rotating speed value and an actual rotating speed value of the generator; determining a required torque change rate of the engine according to the required torque value and a first preset time period; determining a required rotating speed change rate of the generator according to the required rotating speed value and the first preset time period; determining an actual rotating speed change rate of the generator according to the actual rotating speed value and the first preset time period; when the controller generates misfire fault information of the engine, judging the authenticity of the misfire fault information according to the required torque change rate, the required rotating speed change rate and the actual rotating speed change rate. The diagnosis method provided by the application diagnoses the misfire fault information of the hybrid power system, and reduces the situation of limited power generation caused by the misreported misfire fault information of the engine.

Description

Technical Field

[0001] This invention relates to the field of range extender misfire diagnosis technology, and in particular to a method, device and vehicle for diagnosing misfire fault information. Background Technology

[0002] Methanol engines are more prone to ignition difficulties and misfires compared to diesel engines due to the combustion characteristics and conditions of their fuel. Misfires result in reduced engine power output, and the residual air-fuel mixture may ignite prematurely in the next cycle, causing abnormal knocking and damaging pistons or valves. The engine's electronic control unit (ECU) typically detects misfires by monitoring the crankshaft speed change rate; if this fault is detected, it will stop fuel injection.

[0003] For methanol engines equipped with range extenders, since the crankshaft output end is mechanically connected to the generator and the generator speed can be controlled independently by the generator controller, there may be a situation where the engine crankshaft speed changes too quickly due to unstable generator speed control, which may lead to the engine misfire fault being reported incorrectly. Summary of the Invention

[0004] This invention provides a method, device, and vehicle for diagnosing misfire fault information. It acquires the engine's required torque value, the generator's required speed value, and the actual speed value, calculates the rate of change of the engine's required torque, the rate of change of the generator's required speed, and the rate of change of the actual speed, and uses these rates to determine the authenticity of the misfire fault information. This prevents insufficient power generation due to misfire misjudgment, thereby improving engine efficiency and reducing situations where false misfire alarms result in limited power generation.

[0005] According to a first aspect of the present invention, a method for diagnosing misfire fault information is provided, applied to a controller of a hybrid power system, the hybrid power system including at least an engine and a generator; the diagnostic method includes:

[0006] Obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value;

[0007] The required torque change rate of the engine is determined based on the required torque value and the first preset time period.

[0008] The rate of change of the generator's required speed is determined based on the required speed value and the first preset time period.

[0009] The actual speed change rate of the generator is determined based on the actual speed value and the first preset time period.

[0010] When the controller generates misfire fault information for the engine, it determines the authenticity of the misfire fault information based on the required torque change rate, the required speed change rate, and the actual speed change rate.

[0011] Optionally, obtaining the required torque value of the engine, the required speed value of the generator, and the actual speed value includes:

[0012] Obtain the first required torque value of the engine at the current moment and the second required torque value at the previous moment;

[0013] Obtain the first required speed value of the generator at the current moment and the second required speed value at the previous moment;

[0014] Obtain the first actual speed value of the generator at the current moment and the second actual speed value at the previous moment.

[0015] Optionally, the required torque change rate of the engine is determined based on the required torque value and a first preset time period; the required speed change rate of the generator is determined based on the required speed value and the first preset time period; and the actual speed change rate of the generator is determined based on the actual speed value and the first preset time period, including:

[0016] The required torque value is determined by subtracting the first required torque value from the second required torque value, and the ratio of the required torque value to the first preset time period is the required torque change rate.

[0017] The required rotational speed value is determined by subtracting the first required rotational speed value from the second required rotational speed value, and the ratio of the required rotational speed value to the first preset time period is the rate of change of the required rotational speed.

[0018] The actual speed value is determined by the difference between the first actual speed value and the second actual speed value, and the ratio of the actual speed value to the first preset time period is the actual speed change rate.

[0019] Wherein, the first preset time period is the difference between the current time and the previous time.

[0020] Optionally, when the controller generates misfire fault information for the generator, determining the authenticity of the misfire fault information based on the required torque change rate, the required speed change rate, and the actual speed change rate includes:

[0021] Determine whether the rate of change of the required torque is 0;

[0022] If not, the fire fault information is determined to be false;

[0023] If so, then the authenticity of the fire fault information will be further determined.

[0024] Optionally, after further determining the authenticity of the fire fault information, the method further includes:

[0025] Determine the relationship between the actual rotational speed change rate and the first threshold.

[0026] When the actual speed change rate is less than the first threshold, the misfire fault information is determined to be true.

[0027] When the actual speed change rate is greater than or equal to the first threshold, the authenticity of the misfire fault information is further determined.

[0028] Optionally, after determining the authenticity of the misfire fault information when the actual rotational speed change rate is greater than or equal to the first threshold, the method further includes:

[0029] Determine the relationship between the rate of change of the required rotational speed and the second threshold;

[0030] When the rate of change of the required rotational speed is less than the second threshold, the controller generates fault information for the generator.

[0031] When the rate of change of the required rotational speed is greater than or equal to the second threshold, the rate of change of the required rotational speed of the generator is reduced.

[0032] Optionally, after reducing the required speed change rate of the generator when the actual speed change rate is greater than or equal to the second threshold, the method further includes:

[0033] If the controller generates misfire fault information for the engine again, then the misfire fault information is determined to be true.

[0034] Optionally, after the controller generates fault information for the generator when the rate of change of the required rotational speed is less than the second threshold, the method further includes:

[0035] The speed control accuracy of the generator's controller is recalibrated.

[0036] According to a second aspect of the present invention, a diagnostic device for misfire fault information is also provided, applied to a controller of a hybrid power system, the hybrid power system including at least an engine and a generator; the diagnostic device is used to perform the diagnostic method for misfire fault information as described in any one aspect of the present invention, the diagnostic device comprising:

[0037] The acquisition module is used to acquire the required torque value of the engine, the required speed value of the generator, and the actual speed value;

[0038] The calculation module is used to determine the required torque change rate of the engine based on the required torque value and a first preset time period; determine the required speed change rate of the generator based on the required speed value and the first preset time period; and determine the actual speed change rate of the generator based on the actual speed value and the first preset time period.

[0039] The judgment module is used to determine the authenticity of the misfire fault information based on the required torque change rate, the required speed change rate, and the actual speed change rate when the controller generates misfire fault information of the engine.

[0040] According to a third aspect of the present invention, a vehicle is also provided, including a hybrid power system and a diagnostic device for misfire fault information as described in the second aspect of the present invention.

[0041] This invention discloses a method, device, and vehicle for diagnosing misfire fault information, applied to a controller of a hybrid power system. The hybrid power system includes at least an engine and a generator. The diagnostic method includes: acquiring the required torque value of the engine, the required speed value of the generator, and the actual speed value; determining the required torque change rate of the engine based on the required torque value and a first preset time period; determining the required speed change rate of the generator based on the required speed value and the first preset time period; determining the actual speed change rate of the generator based on the actual speed value and the first preset time period; and determining the authenticity of the misfire fault information based on the required torque change rate, required speed change rate, and actual speed change rate when the controller generates misfire fault information. The method for diagnosing misfire fault information provided by this invention acquires the required torque value of the engine, the required speed value of the generator, and the actual speed value, calculates the required torque change rate of the engine, the required speed change rate of the generator, and the actual speed change rate, and uses these rates to determine the authenticity of the misfire fault information, preventing insufficient power generation due to misfire misjudgment, thereby improving engine efficiency and reducing situations where power generation is limited due to false misfire alarms.

[0042] 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

[0043] 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.

[0044] Figure 1 This is a schematic diagram of the hybrid power system structure provided in an embodiment of the present invention;

[0045] Figure 2 This is a flowchart of a method for diagnosing fire fault information provided in an embodiment of the present invention;

[0046] Figure 3 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention;

[0047] Figure 4 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention;

[0048] Figure 5 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention;

[0049] Figure 6 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention;

[0050] Figure 7 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention;

[0051] Figure 8 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention;

[0052] Figure 9 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention;

[0053] Figure 10 This is a schematic diagram of a diagnostic device for fire fault information provided in an embodiment of the present invention. Detailed Implementation

[0054] 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.

[0055] 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.

[0056] 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.

[0057] Figure 1 This is a schematic diagram of the hybrid power system structure provided in an embodiment of the present invention. Figure 2 This is a flowchart of a method for diagnosing fire fault information provided in an embodiment of the present invention, for reference. Figure 1 and Figure 2 The method for diagnosing fire fault information provided in this embodiment of the invention is applied to a hybrid power system. The hybrid power system includes an engine 1, a coupling 2, a generator 3, a generator controller 4, a power battery 5, a drive motor 6, and a drive motor controller 7. The engine 1, coupling 2, and generator 3 are collectively referred to as a range extender.

[0058] In the hybrid system, the entire vehicle's drive and braking are handled by the drive motor 6. During drive, the range extender or the power battery 5 can provide electrical energy. During braking, the drive motor 6 is controlled to generate negative torque, and the drive motor 6 controller generates negative current to feed electrical energy back to the power battery 5. When the charging power of the power battery 5 is limited, the power generation power needs to be cleared to 0 immediately to prevent the sum of the braking regenerative power and the power generation power from exceeding the charging limit allowed by the power battery 5, thereby improving the service life of the power battery 5.

[0059] Engine 1 converts the chemical energy generated by burning gasoline or gas (e.g., methanol) into mechanical energy; generator 3 converts the mechanical energy generated by engine 1 into electrical energy, part of which is transmitted to power battery 5 to charge power battery 5; the other part is transmitted to drive motor 6, which converts the electrical energy into mechanical energy to provide power to the whole vehicle.

[0060] The method for diagnosing fire fault information provided in this embodiment of the invention includes:

[0061] S101. Obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value.

[0062] Specifically, the hybrid system also includes a hybrid control unit (HCU). When the range extender is generating electricity, the range extender's control mode is engine 1 torque control and generator 3 speed control. That is, the vehicle's HCU calculates how much electricity needs to be generated based on the vehicle's needs (such as battery charge, the depth of the driver's accelerator pedal, vehicle speed, etc.). Then, the range extender converts this power generation into a torque command for engine 1. The HCU gives generator 3 a clear target speed command, and generator 3 precisely maintains this speed through its own control system (usually generator controller 4).

[0063] The generator torque is controlled by engine 1, and the generator speed is controlled by generator 3. The generator power is the product of the generator torque and the speed. The generator power is controlled by controlling the generator torque and the speed. The required torque value is the generator torque requirement value obtained by looking up the generator power of the range extender. Engine 1 achieves the required torque value according to the required torque command.

[0064] The required speed value of generator 3 is obtained by looking up the generator speed value based on the generator power of the range extender. The actual speed value of generator 3 is obtained by the speed sensor.

[0065] S102. Determine the engine's required torque change rate based on the required torque value and the first preset time period.

[0066] Specifically, the engine's required torque value is determined based on the engine's required torque value obtained in step S101 above and the first preset time period (e.g., 4s). The required torque change rate refers to the ratio of the difference between the required torque value at the current moment and the required torque value 4s ago to the first preset time period (e.g., 4s).

[0067] S103. Determine the generator's required speed change rate based on the required speed value and the first preset time period.

[0068] Specifically, the generator's required speed value is determined based on the generator's required speed value obtained in step S101 and the first preset time period (e.g., 4s). The required speed change rate refers to the ratio of the difference between the current required speed value and the required speed value 4s ago to the first preset time period (e.g., 4s).

[0069] S104. Determine the actual speed change rate of the generator based on the actual speed value and the first preset time period.

[0070] Specifically, the actual speed change rate of the generator is determined based on the actual speed value of the generator obtained in step S101 above and the first preset time period (e.g., 4s). The actual speed change rate refers to the ratio of the difference between the actual speed value at the current moment and the actual speed value 4s ago to the first preset time period (e.g., 4s).

[0071] S105. When the controller generates misfire fault information of the engine, it determines the authenticity of the misfire fault information based on the required torque change rate, required speed change rate, and actual speed change rate.

[0072] Specifically, when the HCU detects a misfire fault reported by the ECU, it determines the authenticity of the misfire fault reported by the ECU based on the required torque change rate of engine 1, the required speed change rate of generator 3, and the actual speed change rate.

[0073] This invention provides a method for diagnosing misfire fault information. It obtains the engine's required torque value, the generator's required speed value, and the actual speed value, calculates the engine's required torque change rate, the generator's required speed change rate, and the actual speed change rate, and uses these to determine the authenticity of the misfire fault information. This prevents insufficient power generation due to misfire misjudgment, thereby improving engine efficiency and reducing the situation of limited power generation caused by false misfire faults.

[0074] Based on the above embodiments, the present invention further refines the acquisition of the required torque value of the engine, the required speed value of the generator, and the actual speed value. Figure 3 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention, for reference. Figure 3 The method for diagnosing fire fault information provided in this embodiment of the invention includes:

[0075] S201. Obtain the engine's current first required torque value and the previous second required torque value.

[0076] Specifically, engine 1 determines how much electricity the range extender needs to generate based on the needs of the vehicle (such as battery charge, driver's accelerator pedal depth, vehicle speed, etc.), and determines the required torque value of engine 1 based on the generated power. It then obtains the first required torque value of engine 1 at the current moment and the second required torque value at the previous moment (i.e., 4 seconds before the current moment).

[0077] S202. Obtain the first required speed value of the generator at the current moment and the second required speed value at the previous moment.

[0078] Specifically, generator 3 uses its own control system to make the vehicle reach the target speed according to the target speed command. The ECU obtains the first required speed value of generator 3 at the current moment and the second required speed value at the previous moment (i.e., 4 seconds before the current moment).

[0079] S203. Obtain the first actual speed value of the generator at the current moment and the second required speed value at the previous moment.

[0080] Specifically, speed sensor ( Figure 1 (Not shown in the image) The actual speed value of generator 3 is obtained in real time and uploaded to the ECU of the vehicle. The ECU obtains the first actual speed value of generator 3 at the current moment and the second actual speed value at the previous moment (i.e., 4 seconds before the current moment).

[0081] S204. Determine the engine's required torque change rate based on the required torque value and the first preset time period.

[0082] S205. Determine the generator's required speed change rate based on the required speed value and the first preset time period.

[0083] S206. Determine the actual speed change rate of the generator based on the actual speed value and the first preset time period.

[0084] S207. When the controller generates misfire fault information of the engine, it determines the authenticity of the misfire fault information based on the change rate of required torque, the change rate of required speed and the change rate of actual speed.

[0085] Based on the above embodiments, this invention further refines the determination of the engine's required torque change rate based on the required torque value and a first preset time period; the determination of the generator's required speed change rate based on the required speed value and a first preset time period; and the determination of the generator's actual speed change rate based on the actual speed value and a first preset time period. Figure 4 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention, for reference. Figure 4 The method for diagnosing fire fault information provided in this embodiment of the invention includes:

[0086] S301, Obtain the engine's current first required torque value and the previous second required torque value.

[0087] S302. Obtain the first required speed value of the generator at the current moment and the second required speed value at the previous moment.

[0088] S303. Obtain the first actual speed value of the generator at the current moment and the second required speed value at the previous moment.

[0089] S304. The difference between the first required torque value and the second required torque value is used to determine the required torque value. The ratio of the required torque value to the first preset time period is the required torque change rate.

[0090] Specifically, the engine's required torque value can be calculated by subtracting the first required torque value and the second required torque value obtained in step S301 above. The ratio of the engine's required torque value to the first preset time period (e.g., 4s) is the engine's required torque change rate.

[0091] S305. The difference between the first required speed value and the second required speed value is used to determine the required speed value. The ratio of the required speed value to the first preset time period is the required speed change rate.

[0092] Specifically, the first required speed value obtained in step S302 above and the second required speed value at the previous moment are used to calculate the generator's required speed value by subtracting the first required speed value from the second required speed value. The ratio of the generator's required speed value to the first preset time period (e.g., 4s) is the generator's required speed change rate.

[0093] S306. The difference between the first actual speed value and the second actual speed value is used to determine the actual speed value. The ratio of the actual speed value to the first preset time period is the actual speed change rate.

[0094] Specifically, the first required speed value obtained in step S302 above and the second required speed value at the previous moment are used to calculate the generator's required speed value by subtracting the first required speed value from the second required speed value. The ratio of the generator's required speed value to the first preset time period (e.g., 4s) is the generator's required speed change rate.

[0095] S307. When the controller generates misfire fault information of the engine, it determines the authenticity of the misfire fault information based on the change rate of required torque, the change rate of required speed and the change rate of actual speed; wherein, the first preset time period is the difference between the current time and the previous time.

[0096] Based on the above embodiments, this invention further refines the method for determining the authenticity of a misfire fault based on the required torque change rate, required speed change rate, and actual speed change rate when the controller generates misfire fault information for the generator. Figure 5 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention, for reference. Figure 5 The method for diagnosing fire fault information provided in this embodiment of the invention includes:

[0097] S401, obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value.

[0098] S402. Determine the engine's required torque change rate based on the required torque value and the first preset time period.

[0099] S403. Determine the generator's required speed change rate based on the required speed value and the first preset time period.

[0100] S404. Determine the actual speed change rate of the generator based on the actual speed value and the first preset time period.

[0101] S405. When the controller generates misfire fault information for the engine, it determines the authenticity of the misfire fault information based on the required torque change rate, required speed change rate, and actual speed change rate.

[0102] S406. Determine if the rate of change of required torque is 0.

[0103] Specifically, when the vehicle's ECU determines a misfire fault, it requires that the engine's required torque be stable. Therefore, it is necessary to first determine whether the rate of change of the engine's required torque is 0 in order to determine whether the engine is stable.

[0104] S4061. If not, the fire fault information is determined to be false.

[0105] Specifically, if the torque demanded by the engine controlled by the vehicle controller fluctuates, that is, the rate of change of the engine's torque demand is not zero, then the misfire fault information issued by the ECU is directly determined to be false, and the vehicle ECU should report an ECU misfire misjudgment fault.

[0106] S4062. If so, then further determine the authenticity of the fire fault information.

[0107] Specifically, when the engine's required torque change rate is 0, it proves that the vehicle's engine is in a stable state, proving that the vehicle's ECU can judge the misfire situation, and then further determine the authenticity of the misfire fault information generated by the ECU.

[0108] Based on the above embodiments, the present invention further refines the process of determining the authenticity of fire fault information. Figure 6 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention, for reference. Figure 6 The method for diagnosing fire fault information provided in this embodiment of the invention includes:

[0109] S501, obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value.

[0110] S502. Determine the engine's required torque change rate based on the required torque value and the first preset time period.

[0111] S503. Determine the generator's required speed change rate based on the required speed value and the first preset time period.

[0112] S504. Determine the actual speed change rate of the generator based on the actual speed value and the first preset time period.

[0113] S505. When the controller generates misfire fault information for the engine, it determines the authenticity of the misfire fault information based on the required torque change rate, required speed change rate, and actual speed change rate.

[0114] S506. Determine if the rate of change of required torque is 0.

[0115] S507. If so, then further determine the authenticity of the fire fault information.

[0116] S508. Determine the relationship between the actual speed change rate and the first threshold.

[0117] Specifically, when the engine's required torque change rate is not zero, after the ECU can determine the misfire situation, the misfire fault information generated by the ECU further needs to determine the relationship between the actual change rate of the generator speed and the first threshold.

[0118] S5081. When the actual speed change rate is less than the first threshold, the misfire fault information is determined to be true.

[0119] Specifically, when the actual rate of change of the generator speed is less than the first threshold (e.g., 100 rpm / s), it indicates that the misfire is not caused by the generator speed changing too quickly, and the misfire fault information reported by the ECU can be considered true.

[0120] S5082. When the actual speed change rate is greater than or equal to the first threshold, the authenticity of the misfire fault information is further determined.

[0121] Specifically, when the actual speed change rate of the generator is greater than or equal to the first threshold (e.g., 100 rpm / s), it is determined that the misfire of the engine by the ECU may be caused by the excessively rapid change in the actual speed of the generator. At this time, it is necessary to further determine the authenticity of the misfire fault information.

[0122] Based on the above embodiments of the invention, the embodiments of the present invention further refine the determination of the authenticity of misfire fault information when the actual speed change rate is greater than or equal to a first threshold. Figure 7 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention, for reference. Figure 7 The method for diagnosing fire fault information provided in this embodiment of the invention includes:

[0123] S601, obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value.

[0124] S602. When the controller generates misfire fault information of the engine, it determines the authenticity of the misfire fault information based on the change rate of required torque, the change rate of required speed and the change rate of actual speed.

[0125] S603. Determine if the rate of change of required torque is 0.

[0126] S604. If so, then further determine the authenticity of the fire fault information.

[0127] S605. Determine the relationship between the actual speed change rate and the first threshold.

[0128] S606. When the actual speed change rate is greater than or equal to the first threshold, the authenticity of the misfire fault information shall be further determined.

[0129] S607. Determine the relationship between the rate of change of required rotational speed and the second threshold.

[0130] Specifically, when the actual speed change rate of the generator is greater than or equal to the first threshold, it is further necessary to determine the relationship between the generator's required speed change rate and the second threshold (e.g., 50 rpm / s).

[0131] S6071. When the rate of change of the required speed is less than the second threshold, the controller generates fault information for the generator.

[0132] Specifically, when the rate of change of the generator's required speed is less than the second threshold (e.g., 50 rpm / s), it indicates that the actual speed change of the generator is greater than the change of the required speed, indicating a problem with poor generator speed control. The vehicle controller needs to report the generator's fault information (e.g., large speed control deviation fault information).

[0133] S6072. When the rate of change of demand speed is greater than or equal to the second threshold, the rate of change of demand speed of the generator shall be reduced.

[0134] Specifically, when the generator's required speed change rate is greater than or equal to the second threshold (e.g., 50 rpm / s), it is necessary to adjust and reduce the generator's required speed change rate.

[0135] Based on the above embodiments of the invention, the embodiments of the present invention further refine the process of reducing the generator's required speed change rate when the actual speed change rate is greater than or equal to the second threshold. Figure 8 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention, for reference. Figure 8 The method for diagnosing fire fault information provided in this embodiment of the invention includes:

[0136] S701, obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value.

[0137] S702. When the controller generates misfire fault information of the engine, it determines the authenticity of the misfire fault information based on the change rate of required torque, the change rate of required speed and the change rate of actual speed.

[0138] S703. Determine if the rate of change of required torque is 0.

[0139] S704. If so, then further determine the authenticity of the fire fault information.

[0140] S705. Determine the relationship between the actual speed change rate and the first threshold.

[0141] S706. When the actual speed change rate is greater than or equal to the first threshold, the authenticity of the misfire fault information is further determined.

[0142] S707. Determine the relationship between the rate of change of demand speed and the second threshold.

[0143] S708. When the rate of change of demand speed is greater than or equal to the second threshold, the rate of change of demand speed of the generator shall be reduced.

[0144] S709. If the controller generates the generator misfire fault information again, then the misfire fault information is determined to be true.

[0145] Specifically, in step S708 above, after reducing the rate of change of the required speed of the generator of the whole vehicle, the generator is controlled to continue to work. If the control of the whole vehicle generates misfire fault information again, it proves that the misfire fault information is not a misjudgment caused by the speed problem of the generator, and the misfire fault information generated by the whole vehicle controller is directly judged to be true.

[0146] Based on the above embodiments, this invention further refines the process whereby the controller generates generator fault information when the rate of change of the required rotational speed is less than a second threshold. Figure 9 This is a flowchart of another method for diagnosing fire fault information provided in an embodiment of the present invention, for reference. Figure 1 and 9 The method for diagnosing fire fault information provided in this embodiment of the invention includes:

[0147] S801: Obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value.

[0148] S802. When the controller generates misfire fault information of the engine, it determines the authenticity of the misfire fault information based on the change rate of required torque, the change rate of required speed and the change rate of actual speed.

[0149] S803. Determine if the rate of change of required torque is 0.

[0150] S804. If so, then further determine the authenticity of the fire fault information.

[0151] S805. Determine the relationship between the actual speed change rate and the first threshold.

[0152] S806. When the actual speed change rate is greater than or equal to the first threshold, the authenticity of the misfire fault information is further determined.

[0153] S807. Determine the relationship between the rate of change of required rotational speed and the second threshold.

[0154] S808. When the rate of change of the required speed is less than the second threshold, the controller generates fault information for the generator.

[0155] S809. Recalibrate the speed control accuracy of the generator controller.

[0156] Specifically, in step S808 above, after the vehicle controller generates the generator fault information, it is necessary to promptly arrange for engineers to recalibrate the speed control accuracy of the generator controller 4, restoring the difference between the required speed and the actual speed to the actual speed before putting it back into operation. This prevents false alarms of engine 1 misfire faults caused by large deviations in the speed control of the generator controller 4 itself.

[0157] Based on the same inventive concept Figure 10 This is a schematic diagram of a diagnostic device for fire fault information provided in an embodiment of the present invention. (Refer to...) Figure 10 This invention also provides a diagnostic device for misfire fault information, applied to the controller of a hybrid power system, the hybrid power system including at least an engine and a generator; the diagnostic device is used to execute the misfire fault information diagnostic method in any of the above embodiments, and the diagnostic device includes:

[0158] Module A is used to obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value.

[0159] Calculation module B is used to determine the engine's required torque change rate based on the required torque value and a first preset time period; determine the generator's required speed change rate based on the required speed value and a first preset time period; and determine the generator's actual speed change rate based on the actual speed value and a first preset time period.

[0160] The judgment module C is used to determine the authenticity of the misfire fault information based on the required torque change rate, required speed change rate, and actual speed change rate when the controller generates engine misfire fault information.

[0161] The diagnostic device for fire fault information provided in this embodiment of the invention can achieve the same technical effect as the diagnostic method for fire fault information provided in the above-described embodiments of the invention, and will not be described again here.

[0162] Based on the same inventive concept, embodiments of the present invention provide a vehicle characterized by including a hybrid power system and a diagnostic device for misfire fault information in the above-described embodiments.

[0163] The vehicle provided in this embodiment of the invention can achieve the same technical effect as the fire fault information diagnostic device provided in the above-described embodiments of the invention, and will not be described again here.

[0164] 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 diagnosing fire fault information, characterized in that, A controller applied to a hybrid power system, the hybrid power system including at least an engine and a generator; the diagnostic method includes: Obtain the required torque value of the engine, the required speed value of the generator, and the actual speed value; The required torque change rate of the engine is determined based on the required torque value and the first preset time period. The rate of change of the generator's required speed is determined based on the required speed value and the first preset time period. The actual speed change rate of the generator is determined based on the actual speed value and the first preset time period. When the controller generates misfire fault information of the engine, it determines the authenticity of the misfire fault information based on the required torque change rate, the required speed change rate, and the actual speed change rate. When the controller generates misfire fault information for the generator, the authenticity of the misfire fault information is determined based on the required torque change rate, the required speed change rate, and the actual speed change rate, including: Determine whether the rate of change of the required torque is 0; If not, the fire fault information is determined to be false; If so, then the authenticity of the fire fault information shall be further determined; After further determining the authenticity of the fire fault information, the method also includes: Determine the relationship between the actual rotational speed change rate and the first threshold. When the actual speed change rate is less than the first threshold, the misfire fault information is determined to be true. When the actual speed change rate is greater than or equal to the first threshold, the authenticity of the misfire fault information is further determined. When the actual rotational speed change rate is greater than or equal to the first threshold, the method further includes determining the authenticity of the misfire fault information, and then: Determine the relationship between the rate of change of the required rotational speed and the second threshold; When the rate of change of the required rotational speed is less than the second threshold, the controller generates fault information for the generator. When the rate of change of the required rotational speed is greater than or equal to the second threshold, the rate of change of the required rotational speed of the generator is reduced.

2. The method for diagnosing fire fault information according to claim 1, characterized in that, The process of obtaining the required torque value of the engine, the required speed value of the generator, and the actual speed value includes: Obtain the first required torque value of the engine at the current moment and the second required torque value at the previous moment; Obtain the first required speed value of the generator at the current moment and the second required speed value at the previous moment; Obtain the first actual speed value of the generator at the current moment and the second actual speed value at the previous moment.

3. The method for diagnosing fire fault information according to claim 2, characterized in that, The required torque change rate of the engine is determined based on the required torque value and the first preset time period; the required speed change rate of the generator is determined based on the required speed value and the first preset time period. Determining the actual speed change rate of the generator based on the actual speed value and the first preset time period includes: The required torque value is determined by subtracting the first required torque value from the second required torque value, and the ratio of the required torque value to the first preset time period is the required torque change rate. The required rotational speed value is determined by subtracting the first required rotational speed value from the second required rotational speed value, and the ratio of the required rotational speed value to the first preset time period is the rate of change of the required rotational speed. The actual speed value is determined by the difference between the first actual speed value and the second actual speed value, and the ratio of the actual speed value to the first preset time period is the actual speed change rate. Wherein, the first preset time period is the difference between the current time and the previous time.

4. The method for diagnosing fire fault information according to claim 1, characterized in that, After reducing the required speed change rate of the generator when the actual speed change rate is greater than or equal to the second threshold, the method further includes: If the controller generates misfire fault information for the engine again, then the misfire fault information is determined to be true.

5. The method for diagnosing fire fault information according to claim 1, characterized in that, After the controller generates fault information for the generator when the rate of change of the required rotational speed is less than the second threshold, the method further includes: The speed control accuracy of the generator's controller is recalibrated.

6. A diagnostic device for fire fault information, characterized in that, A controller for a hybrid power system, the hybrid power system comprising at least an engine and a generator; the diagnostic device is used to perform the method for diagnosing misfire fault information according to any one of claims 1 to 5, the diagnostic device comprising: The acquisition module is used to acquire the required torque value of the engine, the required speed value of the generator, and the actual speed value; The calculation module is used to determine the required torque change rate of the engine based on the required torque value and a first preset time period; determine the required speed change rate of the generator based on the required speed value and the first preset time period; and determine the actual speed change rate of the generator based on the actual speed value and the first preset time period. The judgment module is used to determine the authenticity of the misfire fault information based on the required torque change rate, the required speed change rate, and the actual speed change rate when the controller generates misfire fault information of the engine.

7. A vehicle, characterized in that, Includes a hybrid power system and a diagnostic device for fire fault information as described in claim 6.

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