Misfire diagnosis method, device and equipment for engine of range extender and storage medium

Abstract

The invention relates to the technical field of vehicles, and discloses a misfire diagnosis method, device and equipment for an engine of a range extender and a storage medium, and the method comprises the steps that under the catalytic converter heating working condition, if the numerical value of a current original misfire risk signal is located outside a preset numerical value interval, the torque of a generator of the range extender is adjusted, acquiring a fire risk signal after the torque is adjusted; and determining whether the engine is on fire or not according to the continuous condition of the fire risk signals with the numerical values larger than the preset signal threshold value in the preset period. Under the heating working condition of the catalyst, if the monitored value of the real-time original misfire risk signal is located outside the preset value interval, the torque of the generator of the range extender is adjusted to adjust the subsequent misfire risk signal, so that the characteristics of the misfire risk signal are enhanced, the influence of other interference signals is weakened in a disguised manner, and the safety of the engine is improved. According to the adjusted misfire risk signal, misfire diagnosis can be carried out more accurately, and the accuracy of misfire diagnosis is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a misfire diagnosis method, device and equipment of a range extender engine and a storage medium. BACKGROUND

[0002] In the cold start process of the engine in the range extender, the EMS (Engine Management System, range extender engine control system) performs relevant control and misfire detection. The engine idle speed is controlled and the ignition advance angle is delayed to accelerate the light-off of the catalyst in the engine exhaust system. The light-off of the catalyst is delayed due to the delay of the ignition advance angle, which reduces the torque of the engine, reduces the intake efficiency of the engine cylinder, reduces the misfire load, and reduces the misfire risk signal of the engine, resulting in poor distinguishability of the crankshaft angular acceleration signal of the engine when a real misfire occurs, so that the misfire risk signal representing the misfire of the engine cannot be accurately identified, causing misfire miss or false alarm. SUMMARY

[0003] In view of the above problems, the present application provides a misfire diagnosis method, device and equipment of a range extender engine and a storage medium to improve the misfire diagnosis accuracy of the range extender engine.

[0004] According to one aspect of the present application, a misfire diagnosis method of a range extender engine is provided, comprising: in a catalyst heating working condition, if the value of a current original misfire risk signal is outside a preset value interval, adjusting the torque of the range extender generator, and collecting a misfire risk signal after torque adjustment; wherein the original misfire risk signal and the misfire risk signal are signals representing the misfire risk size of the range extender engine; determining whether the engine misfires according to the continuous situation of the misfire risk signals with values greater than a preset signal threshold in a preset period; wherein the preset signal threshold is in the preset value interval.

[0005] In an optional manner, the adjustment of the torque of the range extender generator comprises: if the value of the current original misfire risk signal is less than the minimum value in the preset value interval, positively adjusting the torque of the range extender generator based on a first adjustment ratio to amplify the original misfire risk signal; if the value of the current original misfire risk signal is greater than the maximum value in the preset value interval, negatively adjusting the torque of the generator based on a second adjustment ratio to reduce the original misfire risk signal.

[0006] In an optional mode, the misfire diagnosis method further comprises: determining the first adjustment ratio according to the values of the plurality of calibration misfire risk signals and the minimum value in the preset value interval; and determining the second adjustment ratio according to the values of the plurality of calibration misfire risk signals and the maximum value in the preset value interval.

[0007] In an optional mode, the determining the first adjustment ratio according to the values of the plurality of calibration misfire risk signals and the minimum value in the preset value interval comprises: taking the signals in the plurality of calibration misfire risk signals whose values are less than the minimum value in the preset value interval as first signals to be adjusted; positively adjusting the torque of the generator to amplify the values of the first signals to be adjusted, and determining the first adjustment ratio according to the torque adjustment ratio when the value of each first signal to be adjusted reaches the minimum value; and the determining the second adjustment ratio according to the values of the plurality of calibration misfire risk signals and the maximum value in the preset value interval comprises: taking the signals in the plurality of calibration misfire risk signals whose values are greater than the maximum value in the preset value interval as second signals to be adjusted; negatively adjusting the torque of the generator to reduce the values of the second signals to be adjusted, and determining the second adjustment ratio according to the torque adjustment ratio when the value of each second signal to be adjusted reaches the maximum value.

[0008] In an optional mode, the misfire diagnosis method further comprises: performing average operation on the values of first signals in a plurality of historical misfire risk signals to obtain a first average value, the first signals being the signals whose corresponding values are less than or equal to the corresponding value of the minimum calibration misfire risk signal; performing average operation on the values of second signals in the plurality of historical misfire risk signals to obtain a second average value, the second signals being the signals whose corresponding values are greater than or equal to the corresponding value of the maximum calibration misfire risk signal; and taking the first average value and the second average value as the minimum value and the maximum value in the preset value interval, respectively, to obtain the preset value interval.

[0009] In an optional mode, the determining whether the engine misfires according to the continuity of the misfire risk signals whose values are greater than the preset signal threshold in a preset period comprises: determining that the engine misfires if the number of times of continuity of the misfire risk signals whose values are greater than the preset signal threshold in the preset period is greater than a preset number of times.

[0010] In an optional mode, the misfire diagnosis method is applied to a generator controller of a range extender; and the original misfire risk signal is transmitted by a vehicle control unit through a controller area network, and the vehicle control unit acquires the original misfire risk signal in an engine control system of the range extender through the controller area network.

[0011] According to another aspect of the present application, there is provided a misfire diagnosis device for an engine of a range extender, comprising: an adjusting module configured to, in a catalyst heating working condition, adjust a torque of a generator of the range extender if a value of a current original misfire risk signal is outside a preset value range, and collect a misfire risk signal after the torque adjustment; wherein the original misfire risk signal and the misfire risk signal are both signals representing a misfire risk size of the engine of the range extender; and a diagnosis module configured to determine whether the engine misfires according to a continuous condition of the misfire risk signals with values greater than a preset signal threshold in a preset period; wherein the preset signal threshold is in the preset value range.

[0012] According to an aspect of the present application, there is provided an electronic device, comprising: a controller; and a memory configured to store one or more programs, which, when executed by the controller, perform the misfire diagnosis method described above.

[0013] According to an aspect of the present application, there is also provided a computer-readable storage medium having computer-readable instructions stored thereon, which, when executed by a processor of a computer, cause the computer to perform the misfire diagnosis method described above.

[0014] According to an aspect of the present application, there is also provided a computer program product or computer program, which comprises computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to cause the computer device to perform the misfire diagnosis method described above.

[0015] In the present application, the original misfire risk signal is monitored in real time in the catalyst heating condition of the engine exhaust system, and the torque of the generator of the range extender is adjusted if the value of the original misfire risk signal is outside the preset value range, so as to adjust the load of the engine indirectly, thereby adjusting the subsequent misfire risk signal, strengthening the characteristics of the misfire risk signal, and weakening the influence of other interference signals indirectly. Therefore, the misfire diagnosis can be performed more accurately according to the adjusted misfire risk signal, and the accuracy of the misfire diagnosis is improved.

[0016] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This is a schematic flowchart illustrating a misfire diagnosis method for an engine of a range extender, as shown in an exemplary embodiment of this application.

[0019] Figure 2 This is a schematic diagram illustrating fire diagnosis in an exemplary embodiment of this application.

[0020] Figure 3 Based on Figure 1 The exemplary embodiment shown illustrates a flowchart of another method for misfire diagnosis of an engine in a range extender.

[0021] Figure 4 This is a schematic diagram illustrating the application scenario of the misfire diagnosis method for the engine of the range extender in this application.

[0022] Figure 5 This is a schematic diagram of the misfire diagnostic device for the engine of a range extender, as shown in an exemplary embodiment of this application.

[0023] Figure 6 This is a schematic diagram of the structure of a computer system for an electronic device illustrated in an exemplary embodiment of this application. Detailed Implementation

[0024] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0025] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0026] The flowchart shown in the drawing is only an exemplary illustration, and is not necessarily to include all contents and operations / steps, nor is it necessarily to be executed in the order as described. For example, some operations / steps can be further decomposed, and some operations / steps can be combined or partially combined, so that the actual execution order can be changed according to actual conditions.

[0027] “Multiple” mentioned in the present application refers to two or more than two. “And / or” describes the association between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. The character “ / ” generally represents that the associated objects before and after are in an “or” relationship.

[0028] In the cold start process of the engine in the range extender, EMS performs relevant control and misfire detection. The control engine idling and delays the ignition advance angle to accelerate the catalytic converter light-off in the engine exhaust system. Because the delay of the ignition advance angle makes the catalytic converter light-off late, it will reduce the engine torque, reduce the intake efficiency of the engine cylinder, reduce the misfire load, and reduce the misfire risk signal of the engine, so that the crankshaft angular acceleration signal of the engine is less distinguishable when the engine really misfires, and the misfire signal cannot be accurately identified. At the same time, there are special working conditions that will make the misfire risk signal without fire risk abnormally large, so that the misfire scene of the engine cannot be accurately determined, resulting in misfire false alarm or misreporting.

[0029] Therefore, one aspect of the present application provides a misfire diagnosis method for an engine of a range extender. For details, please refer to Figure 1 , Figure 1 is a flowchart of a misfire diagnosis method for an engine of a range extender according to an exemplary embodiment of the present application. The misfire diagnosis method at least includes S110 to S120, which are described in detail as follows:

[0030] S110: In the catalytic converter heating working condition, if the value of the current original misfire risk signal is outside the preset value interval, the torque of the generator of the range extender is adjusted, and the misfire risk signal after the torque adjustment is collected. Wherein, the original misfire risk signal and the misfire risk signal are both signals representing the size of the misfire risk of the engine.

[0031] The catalytic converter heating working condition is a working condition in which an engine of a range extender is expected to quickly heat up the catalytic converter to a working temperature during a starting process. The engine of the range extender needs to quickly light off the catalytic converter during a cold starting process, so that the catalytic converter can play a catalytic role to catalyze and discharge substances that are not fully combusted in the engine. However, during the catalytic converter combustion heating process, the engine may have a misfire risk. In order to speed up the catalytic converter light-off, the EMS delays the ignition advance angle, so that the engine load is small. If the engine misfires during the catalytic converter heating process, the value of the misfire risk signal will be small, and the misfire feature represented by the misfire risk signal cannot be highlighted, but tends to be similar to other interference signals, so that the misfire risk signal and other interference signals cannot be accurately distinguished, resulting in false misfire diagnosis.

[0032] The current original misfire risk signal is an original signal representing the engine misfire risk at the current time.

[0033] The misfire risk signal corresponding to each value in the preset value range has obvious features, and the misfire risk signal can be used as a basis for misfire diagnosis. The preset value range can be determined according to a calibration misfire risk signal, or can be determined according to a historical misfire risk signal, or can be determined according to a related calibration misfire risk signal and a related historical misfire risk signal. The calibration misfire risk signal is a standard misfire risk signal that accurately represents the corresponding value of the misfire feature in the calibration experiment. The historical misfire risk signal is a historical signal that accurately represents the corresponding value of the misfire feature in the historical scene. The origin of the preset value range is exemplarily described as follows:

[0034] For example, the minimum value and the maximum value are determined from the values of a plurality of calibration misfire risk signals, as the minimum critical end value and the maximum critical end value, so as to obtain the preset value range representing the value range.

[0035] For another example, the minimum value and the maximum value are determined from the values of a plurality of historical misfire risk signals, as the minimum critical end value and the maximum critical end value, so as to obtain the preset value range representing the value range.

[0036] Another example: the values of the first signals in the plurality of historical misfire risk signals are averaged to obtain a first average value, the first signals being signals whose corresponding values are less than or equal to the corresponding value of the minimum calibrated misfire risk signal; the values of the second signals in the plurality of historical misfire risk signals are averaged to obtain a second average value, the second signals being signals whose corresponding values are greater than or equal to the corresponding value of the maximum calibrated misfire risk signal; the first average value and the second average value are taken as the minimum value and the maximum value in the preset value interval, respectively, to obtain the preset value interval. This example takes the minimum calibrated misfire risk signal and the maximum calibrated misfire risk signal as the screening conditions, respectively, to screen the first signals and the second signals from the plurality of historical misfire risk signals, and calculates the first average value and the second average value according to the values corresponding to the first signals and the values corresponding to the second signals, respectively, to take the first average value as the minimum value (i.e., the minimum critical end value) and the second average value as the maximum value (i.e., the maximum critical end value) in the preset value interval, so as to quickly determine the preset value interval.

[0037] If the value of the current original misfire risk signal is outside the preset value interval, the feature represented by the current original misfire risk signal is not obvious, and other interference signals will have a significant impact on it. In order to highlight the feature of the original misfire risk signal, the original misfire risk signal collected subsequently needs to be scaled down or scaled up, so that the value corresponding to the scaled misfire risk signal is within the preset value interval, so as to be used for misfire diagnosis of the engine.

[0038] The case that the value of the original misfire risk signal is outside the preset value interval includes two cases: (1) the value of the original misfire risk signal is greater than the maximum value in the preset value interval (i.e., the maximum critical end value of the preset value interval), in which case the feature of the original misfire risk signal may be distorted, and the signal can be scaled down to avoid distortion of the misfire risk signal; (2) the value of the original misfire risk signal is less than the minimum value in the preset value interval (i.e., the minimum critical end value of the preset value interval), in which case the feature of the original misfire risk signal is not obvious, and the signal can be scaled up to highlight its signal feature. This embodiment adjusts the torque of the generator in the range extender to indirectly adjust the load of the engine in the range extender, so that the crankshaft angular acceleration of the engine changes, so as to achieve the purpose of adjusting the size of the misfire risk signal.

[0039] The related technology is controlled and misfire diagnosis is performed by the EMS. In some embodiments of the present application, the subject performing the misfire diagnosis method of the present application is the GCU (Generator Control Unit), and the original misfire risk signal is transmitted by the VCU (Vehicle Control Unit) through the CAN (Controller Area Network). The VCU obtains the original misfire risk signal collected by the EMS through the CAN. In the related technology, the EMS is single-controlled and misfire diagnosis is performed. In the present application, misfire diagnosis is performed by the VCU, the EMS, and the GCU in cooperation. The vehicle CAN serves as a communication bridge. The VCU communicates with the EMS and the GCU through the vehicle CAN. The VCU locks the catalyst heating working condition monitored by the EMS through the vehicle CAN and obtains the original misfire risk signal from the EMS. The GCU is responsible for adjusting the size of the original misfire risk signal. For example, the GCU positively adjusts the torque of the generator to increase the load of the engine, so that the angular acceleration of the crankshaft of the engine increases, thereby increasing the misfire risk signal. The GCU negatively adjusts the torque of the generator to decrease the load of the engine, so that the angular acceleration of the crankshaft of the engine decreases, thereby decreasing the misfire risk signal. The GCU adjusts the output torque of the generator to scale the size of the misfire risk signal, highlights the misfire characteristics represented by the misfire risk signal, accurately identifies the misfire signal, and accurately performs misfire diagnosis.

[0040] S120: determining whether the engine misfires according to the continuity of the misfire risk signal whose value is greater than the preset signal threshold in the preset period; wherein the preset signal threshold is located in the preset value interval.

[0041] The misfire risk signal here refers to a plurality of continuous signals collected after the generator torque is adjusted.

[0042] The preset period is a preset time length or number of times parameter for monitoring the continuity of the misfire risk signal. For example, one preset period can be 20 minutes, and one preset period can also be 2000 times of ignition.

[0043] The value of the misfire risk signal belonging to the preset value interval does not represent the condition for reaching the misfire fault alarm. The preset signal threshold is a parameter for determining whether the misfire risk signal reaches the misfire fault alarm. The preset signal threshold is a preset parameter determined according to the values of all the calibration misfire risk signals. For example, the average value of all the calibration misfire risk signals is calculated, and the average value is taken as the preset signal threshold.

[0044] The embodiment is used to effectively avoid accidental errors. Instead of diagnosing misfire according to the value of a single misfire risk signal, the embodiment monitors the continuous condition of misfire risk signals with values greater than a preset signal threshold in a preset period, and accurately diagnoses misfire according to the value condition of the continuous signals.

[0045] If the number of continuous misfire risk signals with values greater than the preset signal threshold in the preset period is greater than the preset number, it is determined that the engine of the range extender misfires. Figure 2 As shown in the figure, if the number of continuous misfire risk signals with values greater than the preset signal threshold (horizontal line in the figure) in the preset period (2000 times / period) is greater than 65 (i.e., the preset number), it is determined that the engine of the range extender misfires. Figure 2

[0046] If the number of continuous misfire risk signals with values greater than the preset signal threshold in the preset period is less than or equal to the preset number, it is determined that the engine of the range extender does not misfire. The preset number can be adaptively adjusted according to actual scenarios, and the present application does not limit it.

[0047] In the case of heating the catalyst in the engine exhaust system, the original misfire risk signal is monitored in real time, and the torque of the generator of the range extender is adjusted to adjust the load of the engine in the case that the value of the original misfire risk signal is outside the preset value interval, so as to adjust the subsequent misfire risk signal, strengthen the characteristics of the misfire risk signal, and weaken the influence of other interference signals, so that the misfire diagnosis can be more accurately performed according to the adjusted misfire risk signal, and the accuracy of the misfire diagnosis is improved.

[0048] In another exemplary embodiment of the present application, how to scale the original misfire risk signal to obtain the misfire risk signal is described in detail, please refer to Figure 3 , Figure 3 is another flowchart of a misfire diagnosis method of an engine of a range extender shown in the exemplary embodiment shown in Figure 1 . The misfire diagnosis method includes S310 and S320 in S110 shown in Figure 1 . Details are as follows:

[0049] S310: If the value of the current original misfire risk signal is less than the minimum value in the preset value interval, the torque of the generator of the range extender is positively adjusted based on a first adjustment ratio to amplify the original misfire risk signal.

[0050] ​If the value of the current original misfire risk signal is less than the minimum value in the preset value interval (i.e., the minimum critical end value of the preset value interval), the feature of the original misfire risk signal at the current time is not obvious, and the torque of the generator can be adjusted in a positive direction to increase the load of the engine indirectly to amplify the original misfire risk signal collected subsequently, so as to highlight the signal feature of the subsequent misfire risk signal.

[0051] This embodiment adjusts the size of the signal indirectly by adjusting the torque of the generator. By increasing the torque of the generator, the load of the engine is increased indirectly, the crankshaft angular acceleration of the engine is increased, and thus the misfire risk signal is increased (amplified). By decreasing the torque of the generator, the load of the engine is decreased indirectly, the crankshaft angular acceleration of the engine is decreased, and thus the misfire risk signal is decreased (decreased in value), so as to control the size of the misfire risk signal. In order to ensure that the scaled misfire risk signal is obvious, the values of the misfire risk signal after being amplified and decreased are within the preset value interval.

[0052] The first adjustment ratio can be determined according to the values of the calibration misfire risk signals and the related values in the preset value interval. For example, the first adjustment ratio is determined according to the values of the calibration misfire risk signals and the minimum value in the preset value interval. For example, the signals with values less than the minimum value in the preset value interval are taken as the first signals to be adjusted, the torque of the generator is adjusted in a positive direction (i.e., the load of the engine is increased indirectly, and the angular acceleration of the crankshaft of the engine is increased), so as to amplify the values of the first signals to be adjusted, and the first adjustment ratio is determined according to the torque adjustment ratio when the value of each first signal to be adjusted reaches the minimum value. The value of each first signal to be adjusted can be gradually amplified by adjusting the torque of the generator in a positive direction, the starting torque of each first signal to be adjusted when the adjustment of the torque of the generator starts is recorded, and if the corresponding value reaches the minimum value in the preset value interval (i.e., the minimum critical end value of the preset value interval) during the adjustment, the adjustment of the torque of the generator is stopped (i.e., the amplification of the signal is stopped), and the termination torque at this time is recorded, so as to obtain the termination torque of the generator corresponding to each first signal to be adjusted. The ratio between the corresponding termination torque and the corresponding starting torque is taken as the torque adjustment ratio corresponding to the corresponding first signal to be adjusted, and the torque adjustment ratios corresponding to each first signal to be adjusted are calculated in sequence, the torque adjustment ratios corresponding to all first signals to be adjusted are averaged, and the average first adjustment ratio is calculated.

[0053] In some embodiments, the torque adjustment ratio is equal to the signal value adjustment ratio. The signal value adjustment ratio corresponding to each first to-be-adjusted signal can be calculated according to the value of each first to-be-adjusted signal and the value of the adjusted signal, the signal value adjustment ratios corresponding to all first to-be-adjusted signals are averaged, and the average first adjustment ratio is calculated.

[0054] In S320, if the value of the current original misfire risk signal is greater than the maximum value in the preset value range, the torque of the generator is negatively adjusted based on the second adjustment ratio to reduce the original misfire risk signal.

[0055] The second adjustment ratio can be determined according to the value of the calibrated misfire risk signal and the related value in the preset value range. For example, the second adjustment ratio is determined according to the values of the plurality of calibrated misfire risk signals and the maximum value in the preset value range. For example, the signals with values greater than the maximum value in the preset value range in the plurality of calibrated misfire risk signals are taken as second to-be-adjusted signals, the torque of the generator is negatively adjusted (equivalently, the load of the engine is reduced, so that the angular acceleration of the crankshaft of the engine is reduced) to reduce the values of the second to-be-adjusted signals, and the second adjustment ratio is determined according to the torque adjustment ratio when the value of each second to-be-adjusted signal reaches the maximum value. By negatively adjusting the torque of the generator, the value of each second to-be-adjusted signal can be gradually reduced, the starting torque corresponding to each second to-be-adjusted signal when the torque of the generator is adjusted is recorded, and during the adjustment process, if it is monitored that the corresponding value reaches the maximum value in the preset value range (i.e., the maximum critical end value of the preset value range), the torque adjustment operation of the generator is stopped (i.e., the signal is stopped to be reduced), and the termination torque at this time is recorded, so as to obtain the termination torque of the generator corresponding to each second to-be-adjusted signal. The ratio between the corresponding termination torque and the corresponding starting torque is taken as the torque adjustment ratio corresponding to the corresponding second to-be-adjusted signal, and the torque adjustment ratio corresponding to each second to-be-adjusted signal is calculated in sequence, the torque adjustment ratios corresponding to all second to-be-adjusted signals are averaged, and the average second adjustment ratio is calculated.

[0056] In some embodiments, the torque adjustment ratio is equal to the signal value adjustment ratio. The signal value adjustment ratio corresponding to each second to-be-adjusted signal can be calculated according to the value of each second to-be-adjusted signal and the value of the adjusted signal, the signal value adjustment ratios corresponding to all second to-be-adjusted signals are averaged, and the average second adjustment ratio is calculated.

[0057] The embodiment is aimed at signal reduction or amplification of the original misfire risk signal with different numerical values, indirectly adjusts the numerical value of the signal by adjusting the torque of the generator, so that the numerical value of the adjusted misfire risk signal is within the preset numerical interval, highlights the characteristics of the misfire risk signal, and accurately judges the misfire fault of the range extender engine according to the adjusted misfire risk signal.

[0058] The application scene of the above-mentioned multiple misfire diagnosis methods is exemplarily illustrated in another exemplary embodiment of the present application, and details are referred to Figure 4 , Figure 4 is a schematic diagram of the application scene of the misfire diagnosis method of the engine of the range extender. Wherein, the EMS 100, the VCU 200 and the GCU 300 are connected through the vehicle CAN communication mode between the three ends, and they are all placed in the range extended vehicle, and the present application does not limit the connection mode between them.

[0059] The EMS 100 can monitor the catalyst heating working condition of the engine of the range extender, and collect the original misfire risk signal. The original misfire risk signal is sent to the VCU 200 through the CAN. The VCU 200 can also actively obtain the original misfire risk signal collected by the EMS through the CAN, and can send the obtained original misfire risk signal to the GCU 300, so that the GCU 300 is the execution subject of the misfire diagnosis method shown in any of the above exemplary embodiments, to execute any of the above misfire diagnosis methods, which are exemplarily illustrated as follows:

[0060] The GCU 300 adjusts the torque of the generator of the range extender if the numerical value of the current original misfire risk signal is outside the preset numerical interval under the catalyst heating working condition, and the GCU 300 collects the misfire risk signal after the torque adjustment from the VCU. Wherein, the original misfire risk signal and the misfire risk signal are both signals representing the misfire risk size of the engine of the range extender; the GCU 300 determines whether the engine misfires according to the continuous situation of the misfire risk signal with a numerical value greater than the preset signal threshold in a preset period; wherein, the preset signal threshold is within the preset numerical interval.

[0061] The present application takes the vehicle CAN as a communication bridge, and cooperates the VCU 200, the EMS 100 and the GCU 300 to diagnose misfire, so as to separate the misfire diagnosis function from the EMS 100, and facilitate the GCU 300 to scale and adjust the original misfire risk signal.

[0062] Another aspect of the present application also provides a misfire diagnosis device for the engine of the range extender, as shown in Figure 5 Figure 5 ​is a structural schematic diagram of a misfire diagnosis device of an engine of a range extender shown in an example embodiment of the present application. The misfire diagnosis device 500 comprises:

[0063] The adjusting module 510 is configured to adjust the torque of the generator of the range extender if the value of the current original misfire risk signal is outside the preset value interval in the catalyst heating working condition, and collect the misfire risk signal after the torque adjustment; wherein the original misfire risk signal and the misfire risk signal are both signals representing the misfire risk size of the engine of the range extender.

[0064] The diagnosis module 530 is configured to determine whether the engine misfires according to the continuous condition of the misfire risk signals with values greater than the preset signal threshold in the preset period; wherein the preset signal threshold is in the preset value interval.

[0065] In another example embodiment, the adjusting module 510 comprises:

[0066] The amplifying unit is configured to positively adjust the torque of the generator of the range extender based on the first adjustment ratio to amplify the original misfire risk signal if the value of the current original misfire risk signal is less than the minimum value in the preset value interval.

[0067] The reducing unit is configured to negatively adjust the torque of the generator based on the second adjustment ratio to reduce the original misfire risk signal if the value of the current original misfire risk signal is greater than the maximum value in the preset value interval.

[0068] In another example embodiment, the misfire diagnosis device 500 further comprises:

[0069] The first adjustment ratio determination module is configured to determine the first adjustment ratio according to the values of the plurality of calibration misfire risk signals and the minimum value in the preset value interval.

[0070] The second adjustment ratio determination module is configured to determine the second adjustment ratio according to the values of the plurality of calibration misfire risk signals and the maximum value in the preset value interval.

[0071] In another example embodiment, the first adjustment ratio determination module comprises:

[0072] The first determination unit is configured to take the signals with values less than the minimum value in the preset value interval in the plurality of calibration misfire risk signals as the first adjustment signals.

[0073] The first adjustment ratio determination unit is configured to positively adjust the torque of the generator to amplify the values of the first adjustment signals, and determine the first adjustment ratio according to the torque adjustment ratio when the value of each first adjustment signal reaches the minimum value.

[0074] The second adjustment ratio determination module comprises:

[0075] The first determination unit is configured to determine, as the second signals to be adjusted, signals whose values in the plurality of calibration misfire risk signals are greater than the maximum value in the preset value interval.

[0076] The second adjustment ratio determination unit is configured to adjust the torque of the generator in a negative direction to reduce the values of the second signals to be adjusted, and determine the second adjustment ratio according to the torque adjustment ratio when the value of each second signal to be adjusted reaches the maximum value.

[0077] In another exemplary embodiment, the misfire diagnosis device 500 further comprises:

[0078] The first calculation module is configured to perform an average operation on the values of the first signals in the plurality of historical misfire risk signals to obtain a first average value, the first signals being signals whose corresponding values are less than or equal to the corresponding value of the minimum calibration misfire risk signal.

[0079] The second calculation module is configured to perform an average operation on the values of the second signals in the plurality of historical misfire risk signals to obtain a second average value, the second signals being signals whose corresponding values are greater than or equal to the corresponding value of the maximum calibration misfire risk signal.

[0080] The preset value interval determination module is configured to determine the first average value and the second average value as the minimum value and the maximum value in the preset value interval, respectively, to obtain the preset value interval.

[0081] In another exemplary embodiment, the diagnosis module 530 comprises:

[0082] The diagnosis unit is configured to determine that the engine misfires if the number of misfire risk signals whose values are greater than the preset signal threshold in the preset period is greater than the preset number.

[0083] In another exemplary embodiment, the misfire diagnosis method is applied to a generator controller of a range extender; the original misfire risk signal is transmitted by a vehicle control unit through a controller area network, and the vehicle control unit acquires the original misfire risk signal in an engine control system of the range extender through the controller area network.

[0084] The misfire diagnosis device of the present application monitors the original misfire risk signal in real time in the case of heating of a catalyst in an engine exhaust system, and adjusts the torque of the generator of the range extender in the case where the value of the original misfire risk signal is outside the preset value interval, so as to indirectly adjust the load of the engine, thereby adjusting the subsequent misfire risk signal, strengthening the characteristics of the misfire risk signal, and indirectly weakening the influence of other interference signals, so that the misfire diagnosis can be more accurately performed according to the adjusted misfire risk signal, and the accuracy of the misfire diagnosis is improved.

[0085] It should be noted that the misfire diagnosis apparatus provided by the above-mentioned embodiments and the misfire diagnosis method provided by the above-mentioned embodiments belong to the same concept, and the specific manner in which each module and unit performs operations has been described in detail in the method embodiments, which will not be described here.

[0086] Another aspect of the present application also provides an electronic device, comprising: a controller; a memory for storing one or more programs, which when executed by the controller, perform the above-mentioned misfire diagnosis method.

[0087] Please refer to Figure 6 , Figure 6 is a structural schematic diagram of a computer system of an electronic device according to an example embodiment of the present application, which shows a structural schematic diagram of a computer system of an electronic device suitable for implementing the embodiments of the present application.

[0088] It should be noted that Figure 6 The computer system 600 of the electronic device shown is only an example, and should not bring any limitation to the functions and use range of the embodiments of the present application.

[0089] As Figure 6 shown, the computer system 600 includes a central processing unit (CPU) 601, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 602 or programs loaded from a storage portion 608 into a random access memory (RAM) 603, such as performing the methods in the above-mentioned embodiments. In the RAM 603, various programs and data required for system operation are also stored. The CPU 601, the ROM 602, and the RAM 603 are connected to each other through a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0090] The following components are connected to the I / O interface 605: an input part 606 including a keyboard, a mouse, etc.; an output part 607 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), etc., and a speaker, etc.; a storage part 608 including a hard disk, etc.; and a communication part 609 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication part 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as necessary. A removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is attached to the drive 610 as necessary, so that a computer program read out therefrom is installed in the storage part 608 as necessary.

[0091] In particular, according to embodiments of the present application, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, embodiments of the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing a computer program for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network by the communication part 609, and / or installed from the removable medium 611. When the computer program is executed by the central processing unit (CPU) 601, various functions defined in the system of the present application are executed.

[0092] It should be noted that the computer-readable medium in the embodiments of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination thereof. The computer-readable storage medium may, for example, be an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples of the computer-readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this application, the computer-readable storage medium can be any tangible medium that contains or stores a program used by an instruction execution system, apparatus or device, and can be used or combined with the same. In this application, the computer-readable signal medium can include a data signal carried in a baseband or as a part of a carrier wave, which carries computer-readable computer programs. Such a propagated data signal can take various forms, including, but not limited to, an electromagnetic signal, an optical signal, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, which can send, transmit, propagate or transport a program for use by or in connection with an instruction execution system, apparatus or device. The computer programs contained in the computer-readable medium can be transmitted by any suitable medium, including, but not limited to, wireless, wired, or the like, or any suitable combination thereof.

[0093] The flowcharts and block diagrams in the drawings illustrate the possible implementation architectures, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In the flowcharts or block diagrams, each block can represent a module, a program segment or a part of code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in a different order from that noted in the drawings. For example, two blocks represented in succession can actually be executed substantially in parallel, and sometimes in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams or flowcharts, and the combination of blocks in the block diagrams or flowcharts, can be implemented by a dedicated hardware-based system for implementing the specified functions or operations, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0094] The units described in the embodiments of the present application can be implemented by software, or by hardware, or by a combination of software and hardware. The units described can also be located in a single processor. In some cases, the names of the units do not constitute a limitation on the units themselves.

[0095] Another aspect of the present application provides a computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the misfire diagnosis method as described above. The computer readable storage medium can be included in the electronic device as described in the embodiments above, or can exist separately from the electronic device.

[0096] Another aspect of the present application provides a computer program product or computer program, which includes computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions to cause the computer device to perform the misfire diagnosis method provided in the embodiments above.

[0097] According to an aspect of the embodiments of the present application, a computer system is also provided, which includes a central processing unit (CPU) that can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) or loaded from a storage section into a random access memory (RAM), such as the methods in the embodiments above. Various programs and data required for system operation are also stored in the RAM. The CPU, the ROM, and the RAM are connected to each other through a bus. An input / output (I / O) interface is also connected to the bus.

[0098] The following components are connected to the I / O interface: an input section including a keyboard, a mouse, etc.; an output section including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section including a hard disk, etc.; and a communication section including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as necessary. A removable medium, such as a magnetic disk, a magneto-optical disk, a semiconductor memory, etc., is attached to the drive as necessary, so that a computer program read therefrom is installed into the storage section as necessary.

[0099] The above merely provides preferred exemplary embodiments of the present application, and is not intended to limit the implementation of the present application. Based on the main concept and spirit of the present application, the person skilled in the art can easily make corresponding changes or modifications, and the protection scope of the present application should be subject to the protection scope required by the claims.

Claims

1. A method for misfire diagnosis of a range extender engine, characterized in that, include: Under catalytic converter heating conditions, if the value of the original misfire risk signal is outside the preset value range, the torque of the generator of the range extender is adjusted, and the misfire risk signal after torque adjustment is collected; wherein, the original misfire risk signal and the misfire risk signal are both signals that characterize the magnitude of the risk of misfire in the engine of the range extender. The engine is determined to be in a fire based on the continuous occurrence of fire risk signals with values ​​greater than a preset signal threshold within a preset period; wherein the preset signal threshold is located within the preset value range.

2. The fire diagnosis method according to claim 1, characterized in that, The adjustment of the generator torque of the range extender includes: If the value of the current original fire risk signal is less than the minimum value in the preset value range, the torque of the generator of the range extender is positively adjusted based on the first adjustment ratio to amplify the original fire risk signal. If the value of the current original fire risk signal is greater than the maximum value in the preset value range, the torque of the generator is negatively adjusted based on the second adjustment ratio to reduce the original fire risk signal.

3. The fire diagnosis method according to claim 2, characterized in that, The fire diagnosis method also includes: The first adjustment ratio is determined based on the values ​​of multiple calibrated fire risk signals and the minimum value in the preset value range; The second adjustment ratio is determined based on the values ​​of the plurality of calibrated fire risk signals and the maximum value in the preset value range.

4. The fire diagnosis method according to claim 3, characterized in that, Determining the first adjustment ratio based on the minimum value among multiple calibrated fire risk signals and the preset value range includes: The signal whose value is less than the minimum value in the preset value range among the plurality of calibrated fire risk signals is taken as the first signal to be adjusted. The torque of the generator is positively adjusted to amplify the values ​​of each first signal to be adjusted, and the first adjustment ratio is determined based on the torque adjustment ratio when the values ​​of each first signal to be adjusted reach the minimum value. Determining the second adjustment ratio based on the values ​​of the plurality of calibrated fire risk signals and the maximum value within the preset value range includes: The signal whose value is greater than the maximum value in the preset value range among the plurality of calibrated fire risk signals is taken as the second signal to be adjusted. The torque of the generator is negatively adjusted to reduce the value of each of the second adjustment signals, and the second adjustment ratio is determined based on the torque adjustment ratio when the value of each of the second adjustment signals reaches the maximum value.

5. The fire diagnosis method according to claim 1, characterized in that, The fire diagnosis method also includes: The first average value is obtained by averaging the values ​​of the first signal among multiple historical fire risk signals. The first signal is a signal whose corresponding value is less than or equal to the value of the minimum calibrated fire risk signal. The second average value is obtained by averaging the values ​​of the second signal among multiple historical fire risk signals. The second signal is a signal whose corresponding value is greater than or equal to the value corresponding to the maximum calibrated fire risk signal. The first average value and the second average value are respectively used as the minimum and maximum values ​​in the preset value range to obtain the preset value range.

6. The fire diagnosis method according to claim 1, characterized in that, The step of determining whether the engine has misfired based on the continuous occurrence of misfire risk signals with values ​​greater than a preset signal threshold within a preset period includes: If the number of consecutive fire risk signals with values ​​greater than a preset signal threshold within a preset period exceeds a preset number, then the engine is determined to be in fire.

7. The fire diagnosis method according to any one of claims 1 to 6, characterized in that, The misfire diagnosis method is applied to the generator controller of the range extender; the original misfire risk signal is transmitted from the vehicle controller through the controller area network, and the vehicle controller obtains the original misfire risk signal from the engine control system of the range extender through the controller area network.

8. A misfire diagnostic device for a range extender engine, characterized in that, include: The adjustment module is used to adjust the torque of the generator of the range extender if the value of the original misfire risk signal is outside the preset value range when the catalytic converter is heated, and to collect the misfire risk signal after the torque adjustment; wherein, the original misfire risk signal and the misfire risk signal are both signals that characterize the magnitude of the risk of misfire in the engine of the range extender. The diagnostic module is used to determine whether the engine has misfired based on the continuous occurrence of misfire risk signals with values ​​greater than a preset signal threshold within a preset period; wherein the preset signal threshold is located within the preset value range.

9. An electronic device, characterized in that, include: Controller; A memory for storing one or more programs, which, when executed by a controller, cause the controller to implement the fire diagnosis method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, It stores computer-readable instructions that, when executed by the computer's processor, cause the computer to perform the fire diagnosis method according to any one of claims 1 to 7.

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