Range extender fault early warning method, device, equipment, storage medium and computer program product

Abstract

The application discloses a range extender fault early warning method and device, equipment, storage medium and computer program product, relates to the range extender technical field, and the method comprises the following steps: acquiring the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in the power generation state;Every interval unit time, the signal mean of the upstream oxygen sensor is calculated according to the upstream oxygen sensor signal, and the voltage out-of-limit time ratio of the downstream oxygen sensor is calculated according to the downstream oxygen sensor voltage;Based on the signal mean and the voltage out-of-limit time ratio, the range extender is detected for fault, and the fault early warning is sent when the range extender exists fault.The signal mean and the voltage out-of-limit time ratio of every interval unit time are calculated by monitoring the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in the power generation state, so that the range extender is periodically detected for fault, and the problem that the vehicle is caused to lie in the nest due to the fact that the range extender cannot charge the power battery is avoided.

Description

Technical Field

[0001] This application relates to the field of range extender technology, and in particular to a method, apparatus, equipment, storage medium and computer program product for early warning of range extender faults. Background Technology

[0002] With the increasing maturity of range extender technology, range-extended electric vehicles (REEVs) have flourished in recent years, gradually becoming a major growth driver in the automotive market. In practical applications of REEVs, even if the range extender experiences some abnormalities or malfunctions, the battery can still power the vehicle normally, making these issues less noticeable to users.

[0003] However, if the range extender malfunction is not detected and addressed when the battery is depleted, it will directly prevent the range extender from charging the battery, leading to vehicle breakdowns. Therefore, accurate early warning of range extender malfunctions is crucial for improving the product quality, safety, and market competitiveness of range-extended electric vehicles. Summary of the Invention

[0004] The main objective of this application is to provide a method, apparatus, device, storage medium, and computer program product for early warning of range extender faults, aiming to solve the technical problem of how to accurately predict faults in range extenders.

[0005] To achieve the above objectives, this application provides a method for early warning of range extender faults, the method comprising the following steps:

[0006] Acquire the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender when it is in power generation mode;

[0007] At each unit time interval, the average signal value of the upstream oxygen sensor is calculated based on the upstream oxygen sensor signal, and the voltage over-limit time ratio of the downstream oxygen sensor is calculated based on the downstream oxygen sensor voltage.

[0008] The range extender is fault detected based on the average signal value and the voltage over-limit time ratio, and a fault warning is issued when a fault exists in the range extender.

[0009] In one embodiment, before the step of acquiring the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in power generation mode, the method further includes:

[0010] The rotational speed of the range extender is obtained, and the current state of the range extender is determined based on the rotational speed;

[0011] If the current state is a power generation state, then the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender are acquired.

[0012] In one embodiment, the voltage over-limit time ratio includes a first time ratio and a second time ratio, and the step of calculating the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage includes:

[0013] Within a unit time period, the proportion of the total time during which the voltage of the downstream oxygen sensor is lower than the first voltage threshold relative to the unit time period is calculated to obtain the first time ratio.

[0014] Within a unit time period, the total duration during which the downstream oxygen sensor voltage is higher than the second voltage threshold is counted relative to the unit time period to obtain the second time ratio.

[0015] In one embodiment, the step of fault detection of the range extender based on the average signal value and the voltage over-limit time ratio includes:

[0016] When the average signal value is lower than the first signal threshold, the first number of abnormalities of the range extender within a first preset time period is counted according to the first time ratio.

[0017] When the average signal value is higher than the second signal threshold, the number of second anomalies of the range extender within the second preset time period is counted according to the second time ratio.

[0018] If the first number of abnormal occurrences is greater than the first threshold and / or the second number of abnormal occurrences is greater than the second threshold, then the range extender is determined to be faulty.

[0019] If the first number of abnormalities is less than or equal to the first threshold and the second number of abnormalities is less than or equal to the second threshold, then the range extender is determined to be fault-free.

[0020] In one embodiment, the step of counting the number of first anomalies of the range extender within a first preset time period based on the first time ratio when the average signal value is lower than a first signal threshold includes:

[0021] When the average value of the signal is lower than the first signal threshold, if the first time ratio is higher than the first proportion threshold, an oxygen concentration anomaly is recorded.

[0022] The first abnormality count is obtained by summing up all the abnormal oxygen concentration counts that occur in the range extender within a first preset time period.

[0023] Wherein, the first signal threshold represents the critical value corresponding to determining that the mixed gas in the range extender is a lean mixture.

[0024] In one embodiment, the step of counting the number of second anomalies of the range extender within a second preset time period based on the second time ratio when the average signal value is higher than the second signal threshold includes:

[0025] When the average value of the signal is higher than the second signal threshold, if the second time ratio is higher than the second proportion threshold, then an abnormal fuel concentration is recorded.

[0026] The number of times the range extender experiences fuel concentration anomalies within a second preset time period is summed to obtain the second anomaly count.

[0027] The second signal threshold represents the critical value for determining that the mixed gas in the range extender is a rich mixture.

[0028] Furthermore, to achieve the above objectives, this application also proposes a range extender fault early warning device, which includes:

[0029] The data acquisition module is used to acquire the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender when it is in power generation mode.

[0030] The data calculation module is used to calculate the average signal value of the upstream oxygen sensor based on the upstream oxygen sensor signal at each interval unit time, and to calculate the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage.

[0031] The fault detection module is used to detect faults in the range extender based on the average signal value and the voltage over-limit time ratio, and to issue a fault warning when a fault exists in the range extender.

[0032] In addition, to achieve the above objectives, this application also proposes a range extender fault warning device, the device comprising: a memory, a processor, and a range extender fault warning program stored in the memory and executable on the processor, the range extender fault warning program being configured to implement the steps of the range extender fault warning method as described above.

[0033] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, storing a range extender fault warning program, wherein when the range extender fault warning program is executed by a processor, it implements the steps of the range extender fault warning method described above.

[0034] In addition, to achieve the above objectives, the present invention also provides a computer program product, the computer program product including a range extender fault warning program, which, when executed by a processor, implements the steps of the range extender fault warning method as described above.

[0035] This application acquires the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in generator mode; at unit intervals, it calculates the average signal value of the upstream oxygen sensor based on the upstream oxygen sensor signal, and calculates the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage; it performs fault detection on the range extender based on the average signal value and the voltage over-limit time ratio, and issues a fault warning when a fault exists in the range extender. Since the upstream and downstream oxygen sensor signals can reflect the actual operating status of the range extender, the method described in this application calculates the average signal value and voltage over-limit time ratio at unit intervals by monitoring the upstream and downstream oxygen sensor signals output by the range extender in generator mode. This allows for accurate determination of the range extender's operating status within a unit time period based on the average signal value and the voltage over-limit time ratio, thereby enabling periodic fault detection of the range extender and preventing vehicle breakdowns due to the range extender's inability to charge the power battery. Attached Figure Description

[0036] 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.

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating the first embodiment of the range extender fault early warning method of this application;

[0039] Figure 2 This is a flowchart illustrating the second embodiment of the range extender fault early warning method of this application;

[0040] Figure 3 This is a flowchart illustrating the third embodiment of the range extender fault early warning method of this application;

[0041] Figure 4 This is a structural block diagram of the first embodiment of the range extender fault early warning device of this application;

[0042] Figure 5 This is a schematic diagram of the structure of the range extender fault early warning device in the hardware operating environment involved in the embodiments of this application.

[0043] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not intended to limit this application.

[0045] It should be noted that the executing entity of the embodiments of this application can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of realizing the above functions, such as the aforementioned range extender fault warning device. The following embodiments will be described using the range extender fault warning device as an example.

[0046] This application provides a method for early warning of range extender faults, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the range extender fault early warning method of this application.

[0047] In this embodiment, the range extender fault early warning method includes the following steps:

[0048] Step S10: Obtain the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender when it is in power generation mode.

[0049] Understandably, the aforementioned range extender is an auxiliary power unit used to extend the driving range of an electric vehicle. It generates electricity by burning fuel (such as gasoline, diesel, natural gas, etc.), thereby extending the electric vehicle's driving range. A range extender typically includes an engine and a generator. The engine is responsible for burning fuel to generate mechanical energy, and the generator converts the engine's mechanical energy into electrical energy to charge the battery or directly drive the motor. When the range extender is performing power generation operations for the electric vehicle's battery, it indicates that the range extender is in power generation mode. The aforementioned upstream oxygen sensor signal and downstream oxygen sensor voltage can be obtained from the vehicle network.

[0050] It should be understood that the upstream oxygen sensor (also known as the pre-oxygen sensor) is installed on the exhaust manifold or exhaust pipe of the range extender, before the catalytic converter. The upstream oxygen sensor primarily monitors whether the engine's fuel-air mixture ratio (the ratio of air to fuel) is appropriate. Therefore, the upstream oxygen sensor signal directly affects the engine control unit's adjustment of fuel injection quantity and intake air quantity, thereby achieving closed-loop control and ensuring that combustion is as close as possible to the ideal stoichiometric ratio. The upstream oxygen sensor signal can be voltage, pressure, etc., and this embodiment does not impose any limitations on this.

[0051] The downstream oxygen sensor (also known as the after-oxygen sensor) is installed after the catalytic converter, near the end of the exhaust pipe. The downstream oxygen sensor is primarily used to monitor the operating efficiency of the catalytic converter. The catalytic converter converts harmful gases (such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx)) into harmless gases (carbon dioxide (CO2), water (H2O), and nitrogen (N2)) through chemical reactions, storing and releasing oxygen in the process. Therefore, the voltage of the downstream oxygen sensor can be used to reflect whether the catalytic converter is operating normally.

[0052] Step S20: At each unit time interval, calculate the average signal value of the upstream oxygen sensor based on the upstream oxygen sensor signal, and calculate the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage.

[0053] It should be noted that the above unit duration can be flexibly set according to the actual usage scenario, such as 60 seconds, 5 minutes, etc. The above signal average represents the average value of all upstream sensor signals within the unit duration, and the above voltage over-limit time ratio represents the proportion of the duration during which the voltages of all downstream oxygen sensors exceeding the normal operating voltage last within the unit duration. Among them, the normal operating voltage refers to the operating voltage corresponding to the range extender when performing normal charging operation for the vehicle.

[0054] In a specific implementation, the voltage of the downstream oxygen sensor can be sampled based on a fixed sampling period (e.g., 2 seconds, 5 seconds, etc.). Then, the voltage over-limit time ratio can be obtained by calculating the proportion of the total sampling period corresponding to all downstream oxygen sensor voltages that exceed the normal operating voltage within a unit of time.

[0055] Step S30: Perform fault detection on the range extender based on the average signal value and the voltage over-limit time ratio, and issue a fault warning when the range extender has a fault.

[0056] In practice, the range extender can be judged to perform normal charging operation on the power battery based on the above signal average and voltage over-limit time ratio. If yes, it can be determined that the range extender is not faulty; if no, it can be determined that the range extender is faulty and a fault warning will be issued to the user and after-sales personnel to remind the user to send the vehicle to the after-sales service point for inspection.

[0057] This embodiment acquires the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in generator mode. At regular intervals, it calculates the average signal value of the upstream oxygen sensor based on the upstream oxygen sensor signal and the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage. Based on the average signal value and the voltage over-limit time ratio, it performs fault detection on the range extender and issues a fault warning when a fault exists. Since the upstream and downstream oxygen sensor signals reflect the actual operating status of the range extender, the method described in this embodiment calculates the average signal value and voltage over-limit time ratio at regular intervals by monitoring the upstream and downstream oxygen sensor signals output by the range extender in generator mode. This allows for accurate determination of the range extender's operating status within a unit time period based on the average signal value and the voltage over-limit time ratio, thereby enabling periodic fault detection of the range extender and preventing vehicle breakdowns due to the range extender's inability to charge the power battery.

[0058] refer to Figure 2 , Figure 2 This is a flowchart illustrating the second embodiment of the range extender fault early warning method of this application.

[0059] In one feasible implementation, prior to step S10, the following may also be included:

[0060] Step S1: Obtain the rotational speed of the range extender and determine the current state of the range extender based on the rotational speed.

[0061] It should be noted that the speed of the range extender mentioned above refers to the rotational speed of the engine output shaft inside the range extender, usually measured in RPM (Revolutions Per minute).

[0062] Step S2: If the current state is the power generation state, then obtain the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender.

[0063] It should be understood that since this application aims to address the issue that "when the power battery is depleted, if the range extender's fault is not detected and addressed, it will directly prevent the range extender from charging the power battery, resulting in the vehicle becoming stranded," this embodiment only acquires the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in the power generation state. Data from the non-power generation state is meaningless for subsequent range extender fault analysis and may even lead to deviations in the analysis results.

[0064] In practical implementation, the range extender's speed can also be obtained from the vehicle network. After the range extender starts, its engine drives the generator, and the speed will stabilize within a specific range for efficient power generation (e.g., greater than or equal to 2000 RPM and less than or equal to 4000 RPM; the specific value varies depending on the design and is not limited here). At this time, the current state of the range extender can be determined as the power generation state; if the speed is not within this specific range, the current state of the range extender can be determined as the non-power generation state. Specifically, the non-power generation state can include the non-started state, idling state, or low load state: when the speed is 0 RPM, it means that the range extender is completely shut down, which corresponds to the non-started state; when the speed is low (e.g., greater than 0 RPM and less than 2000 RPM; the specific value varies depending on the design and is not limited here), it means that the range extender may be in an idling or low load state due to system self-check, preheating, or standby. In addition, when the speed is greater than a certain value (e.g., 5000 RPM; the specific value varies depending on the design and is not limited here), it can be directly determined that the range extender has malfunctioned.

[0065] In one feasible implementation, the voltage over-limit time ratio includes a first time ratio and a second time ratio, and step S20 may include:

[0066] Step S201: Within a unit time period, calculate the proportion of the total time during which the voltage of the downstream oxygen sensor is lower than the first voltage threshold relative to the unit time period to obtain the first time ratio.

[0067] It should be noted that the above-mentioned first time ratio represents the proportion of the total time during which the downstream oxygen sensor operates at a voltage condition lower than the lower limit of oxygen storage in the catalyst per unit time, which reflects the oxygen concentration in the range extender.

[0068] Step S202: Within a unit time period, calculate the proportion of the total time during which the downstream oxygen sensor voltage is higher than the second voltage threshold relative to the unit time period to obtain the second time ratio.

[0069] It should be noted that the second time ratio mentioned above represents the proportion of the total time during which the downstream oxygen sensor operates at a voltage condition higher than the upper limit of the catalytic converter's oxygen storage capacity per unit time, which reflects the fuel concentration in the range extender.

[0070] Wherein, the first voltage threshold and the second voltage threshold represent the lower limit and upper limit of oxygen storage corresponding to the catalyst connected to the downstream oxygen sensor, respectively.

[0071] This embodiment acquires the rotational speed of the range extender and determines its current state based on the rotational speed. If the current state is power generation, the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender are acquired. Within a unit time period, the proportion of the total time during which the downstream oxygen sensor voltage is below a first voltage threshold relative to the unit time period is calculated to obtain a first time ratio. Within a unit time period, the proportion of the total time during which the downstream oxygen sensor voltage is above a second voltage threshold relative to the unit time period is calculated to obtain a second time ratio. This embodiment's method determines whether the range extender is generating electricity for the power battery based on its rotational speed: if so, the output upstream oxygen sensor signal and downstream oxygen sensor voltage are acquired to provide a data basis for subsequent fault detection; if not, they are not acquired to avoid consuming unnecessary data resources. Simultaneously, the proportion of the total time during which the downstream oxygen sensor voltage is below the first voltage threshold relative to the unit time period is calculated to accurately calculate the proportion of the range extender's operating time below the catalytic converter's oxygen storage lower limit; the proportion of the total time during which the downstream oxygen sensor voltage is above the second voltage threshold relative to the unit time period is calculated to accurately calculate the proportion of the range extender's operating time above the catalytic converter's oxygen storage upper limit is calculated.

[0072] refer to Figure 3 , Figure 3 This is a flowchart illustrating the third embodiment of the range extender fault early warning method of this application.

[0073] In one feasible implementation, step S30 may include:

[0074] Step S301: When the average signal value is lower than the first signal threshold, the first number of abnormalities of the range extender within the first preset time period is counted according to the first time ratio.

[0075] It should be understood that the above-mentioned first abnormal number can represent the number of times the oxygen concentration is abnormal in the range extender; the above-mentioned first signal threshold represents the critical value corresponding to the determination that the gas mixture in the range extender is a lean mixture. That is, when the average signal value is lower than the first signal threshold, the gas mixture in the range extender can be determined to be a lean mixture, that is, a mixture with relatively more air and relatively less fuel.

[0076] Step S302: When the average signal value is higher than the second signal threshold, the number of second anomalies of the range extender within the second preset time period is counted according to the second time ratio.

[0077] It should be understood that the above-mentioned second abnormal number can represent the number of times the fuel concentration is abnormal in the range extender; the above-mentioned second signal threshold represents the critical value corresponding to the determination that the gas mixture in the range extender is a rich gas mixture. That is, when the average signal value is lower than the second signal threshold, the gas mixture in the range extender can be determined to be a rich gas mixture, that is, a gas mixture with relatively more fuel and relatively less air.

[0078] Step S303: If the first number of abnormalities is greater than the first threshold and / or the second number of abnormalities is greater than the second threshold, then the range extender is determined to be faulty.

[0079] Step S304: If the first number of abnormalities is less than or equal to the first number threshold and the second number of abnormalities is less than or equal to the second number threshold, then it is determined that the range extender has no fault.

[0080] It should be noted that the number of first and second anomalies can be flexibly set, such as 3 times, 5 times, etc., and this embodiment does not impose any restrictions on this.

[0081] It should be understood that, due to the occasional false alarms in range extenders, if a fault is determined to exist based on the number of abnormal alarms detected, users may find that the alarms were actually false when they take their vehicles to after-sales service centers for inspection, thus affecting the user experience. Therefore, this embodiment sets a first alarm threshold and a second alarm threshold. When the first alarm count is greater than the first alarm threshold and / or the second alarm count is greater than the second alarm threshold, it indicates that the alarms are not occasional false alarms, and the range extender can be determined to be faulty. When the first alarm count is less than or equal to the first alarm threshold and the second alarm count is less than or equal to the second alarm threshold, it indicates that the alarms are occasional false alarms, and the range extender can be determined to be without fault.

[0082] In practice, to avoid the first and second anomaly counts in the current detection cycle affecting the fault detection in the next cycle, after determining whether the range extender has a fault or not, it is necessary to clear the first and second anomaly counts to zero.

[0083] In one feasible implementation, step S301 may include:

[0084] Step S3011: When the average value of the signal is lower than the first signal threshold, if the first time ratio is higher than the first proportion threshold, then an oxygen concentration anomaly is recorded.

[0085] Step S3012: Accumulate all the abnormal oxygen concentration occurrences of the range extender within the first preset time period to obtain the first abnormal count.

[0086] Wherein, the first signal threshold represents the critical value corresponding to determining that the mixed gas in the range extender is a lean mixture.

[0087] In practice, when the average signal value is lower than the first signal threshold, it indicates that the mixed gas in the range extender is a lean mixture. If the first time ratio is higher than the first proportion threshold, it means that the downstream oxygen sensor has been operating at a voltage condition lower than the lower limit of oxygen storage in the catalyst for a long time. Therefore, an abnormal oxygen concentration may occur in the range extender.

[0088] In one feasible implementation, step S302 may include:

[0089] Step S3021: When the average value of the signal is higher than the second signal threshold, if the second time ratio is higher than the second proportion threshold, then record a fuel concentration anomaly.

[0090] In practice, when the average signal value is higher than the second signal threshold, it indicates that the gas mixture in the range extender is a rich mixture. If the second time ratio is higher than the second proportion threshold, it means that the downstream oxygen sensor has been operating at a voltage condition higher than the upper limit of the oxygen storage capacity of the catalyst for a long time. Therefore, abnormal fuel concentration may occur in the range extender.

[0091] Step S3022: The number of times the range extender experiences fuel concentration anomalies within a second preset time period is summed to obtain the second number of anomalies.

[0092] The second signal threshold represents the critical value for determining that the mixed gas in the range extender is a rich mixture.

[0093] It should be understood that in this embodiment and the above embodiments, the settings of various thresholds and preset values ​​can be formulated based on checking the status of a large number of vehicle range extenders in the market and analyzing the corresponding range extender operating data. For example, in a case of a vehicle matched with a 1.8L range extender with a rated power of 60kW, regarding the range extender malfunction warning, the preset duration t0 = 60s, the preset upstream oxygen sensor threshold P01 = 0.995, the preset upstream oxygen sensor threshold P02 = 1.005, the preset downstream oxygen sensor threshold V01 = 0.3V, the preset downstream oxygen sensor threshold V02 = 0.85V, the preset duration percentage e01 = 50%, the preset duration percentage e02 = 50%, the threshold n01 is set to 3 times, the preset duration t1 = 12h, the threshold n02 is set to 3 times, and the preset duration t2 = 12h.

[0094] Based on the same data formulation method as the above case, in a case of a vehicle matched with a 2.0L range extender with a rated power of 100kW, the pre-set duration for the range extender malfunction warning is as follows: t0 = 60s, pre-set upstream oxygen sensor threshold P01 = 0.995, upstream oxygen sensor threshold P02 = 1.005, pre-set downstream oxygen sensor threshold V01 = 0.3V, downstream oxygen sensor threshold V02 = 0.85V, pre-set duration percentage e01 = 50%, duration percentage e02 = 50%, threshold n01 is set to 3 times, pre-set duration t1 = 12h, threshold n02 is set to 3 times, and pre-set duration t2 = 12h.

[0095] In the two examples above, t0 represents the unit duration, P01 represents the first signal threshold, P02 represents the second signal threshold, V01 represents the first voltage threshold, V02 represents the second voltage threshold, e01 represents the first time ratio, e02 represents the second time ratio, n01 represents the first count threshold, n02 represents the second count threshold, t1 represents the first preset duration, and t2 represents the second preset duration.

[0096] In this embodiment, when the average signal value is lower than a first signal threshold, if the first time ratio is higher than a first proportion threshold, an oxygen concentration anomaly is recorded. The number of oxygen concentration anomalies occurring in the range extender within a first preset time period is accumulated to obtain a first anomaly count. The first signal threshold represents the critical value for determining that the gas mixture in the range extender is a lean mixture. When the average signal value is higher than a second signal threshold, if the second time ratio is higher than a second proportion threshold, a fuel concentration anomaly is recorded. The number of fuel concentration anomalies occurring in the range extender within a second preset time period is accumulated to obtain a second anomaly count. The second signal threshold represents the critical value for determining that the gas mixture in the range extender is a rich mixture. If the first anomaly count is greater than a first count threshold and / or the second anomaly count is greater than a second count threshold, the range extender is determined to be faulty. If the first anomaly count is less than or equal to a first count threshold and the second anomaly count is less than or equal to a second count threshold, the range extender is determined not to be faulty. In this embodiment, when the average signal value is lower than a first signal threshold (i.e., the gas mixture in the range extender is lean), the method determines whether an oxygen concentration anomaly has occurred in the range extender by comparing the value between a first time ratio and a first proportion threshold, and accumulates the number of anomalies to provide a data basis for subsequent judgment on whether the range extender has malfunctioned. Simultaneously, when the average signal value is lower than a second signal threshold (i.e., the gas mixture in the range extender is rich), the method determines whether a fuel concentration anomaly has occurred in the range extender by comparing the value between a second time ratio and a second proportion threshold, and accumulates the number of anomalies to provide a data basis for subsequent judgment on whether the range extender has malfunctioned. Furthermore, since the range extender may experience occasional false alarms, this embodiment uses a first count threshold and a second count threshold to determine whether the range extender has truly malfunctioned, thereby avoiding unnecessary impacts on the user's trip due to false alarms.

[0097] Reference Figure 4 , Figure 4 This is a structural block diagram of the first embodiment of the range extender fault early warning device of this application.

[0098] like Figure 4 As shown, the range extender fault early warning device proposed in this application includes:

[0099] The data acquisition module 401 is used to acquire the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender when it is in power generation mode.

[0100] The data calculation module 402 is used to calculate the average signal value of the upstream oxygen sensor based on the upstream oxygen sensor signal at each interval unit time, and to calculate the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage.

[0101] The fault detection module 403 is used to detect faults in the range extender based on the average signal value and the voltage over-limit time ratio, and to issue a fault warning when a fault exists in the range extender.

[0102] This embodiment acquires the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in generator mode. At regular intervals, it calculates the average signal value of the upstream oxygen sensor based on the upstream oxygen sensor signal and the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage. Based on the average signal value and the voltage over-limit time ratio, it performs fault detection on the range extender and issues a fault warning when a fault exists. Since the upstream and downstream oxygen sensor signals reflect the actual operating status of the range extender, the method described in this embodiment calculates the average signal value and voltage over-limit time ratio at regular intervals by monitoring the upstream and downstream oxygen sensor signals output by the range extender in generator mode. This allows for accurate determination of the range extender's operating status within a unit time period based on the average signal value and the voltage over-limit time ratio, thereby enabling periodic fault detection of the range extender and preventing vehicle breakdowns due to the range extender's inability to charge the power battery.

[0103] Based on the first embodiment of the range extender fault warning device described in this application, a second embodiment of the range extender fault warning device of this application is proposed.

[0104] In this embodiment, the data acquisition module 401 is further configured to acquire the rotational speed of the range extender and determine the current state of the range extender based on the rotational speed; if the current state is a power generation state, then the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender are acquired.

[0105] Furthermore, the voltage over-limit time ratio includes a first time ratio and a second time ratio. The data calculation module 402 is also used to calculate the proportion of the total time during which the downstream oxygen sensor voltage is lower than the first voltage threshold relative to the unit time within a unit time period to obtain the first time ratio; and to calculate the proportion of the total time during which the downstream oxygen sensor voltage is higher than the second voltage threshold relative to the unit time within a unit time period to obtain the second time ratio.

[0106] Furthermore, the fault detection module 403 is also configured to: when the average signal value is lower than a first signal threshold, count the number of first anomalies of the range extender within a first preset time period according to the first time ratio; when the average signal value is higher than a second signal threshold, count the number of second anomalies of the range extender within a second preset time period according to the second time ratio; if the number of first anomalies is greater than the first threshold and / or the number of second anomalies is greater than the second threshold, then the range extender is determined to have a fault; if the number of first anomalies is less than or equal to the first threshold and the number of second anomalies is less than or equal to the second threshold, then the range extender is determined not to have a fault.

[0107] Furthermore, the fault detection module 403 is also used to record an oxygen concentration anomaly when the average signal value is lower than the first signal threshold and the first time ratio is higher than the first proportion threshold; and to accumulate all the oxygen concentration anomalies that occur in the range extender within a first preset time period to obtain a first anomaly count; wherein the first signal threshold represents the critical value corresponding to determining that the mixed gas in the range extender is a lean mixture.

[0108] Furthermore, the fault detection module 403 is also used to record a fuel concentration anomaly when the average signal value is higher than the second signal threshold and the second time ratio is higher than the second proportion threshold; and to accumulate all the fuel concentration anomalies that occur in the range extender within a second preset time period to obtain a second anomaly count; wherein the second signal threshold represents the critical value corresponding to determining that the mixed gas in the range extender is a rich mixed gas.

[0109] Other embodiments or specific implementations of the range extender fault warning device of this application can be referred to the above-described method embodiments, and will not be repeated here.

[0110] This application provides a range extender fault warning device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the range extender fault warning method in the above embodiment 1.

[0111] The following is for reference. Figure 5The diagram illustrates a structural schematic suitable for implementing the range extender fault warning device in the embodiments of this application. The range extender fault warning device in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The range extender fault warning device shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0112] like Figure 5 As shown, the range extender fault warning device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory 1002 or a program loaded from a storage device 1003 into a random access memory 1004. The random access memory 1004 also stores various programs and data required for the operation of the range extender fault warning device. The processing unit 1001, the read-only memory 1002, and the random access memory 1004 are interconnected via a bus 1005. An input / output interface 1006 is also connected to the bus. Typically, the following systems can be connected to the input / output interface 1006: input devices 1007 including, for example, a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows the range extender fault warning device to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows range extender fault warning devices with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0113] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from read-only memory 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0114] The range extender fault early warning device provided in this application, employing the range extender fault early warning method in the above embodiments, can solve the technical problem of how to accurately predict range extender faults. Compared with the prior art, the beneficial effects of the range extender fault early warning device provided in this application are the same as those of the range extender fault early warning method provided in the above embodiments, and other technical features in this range extender fault early warning device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0115] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0116] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0117] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the range extender fault warning method in the above embodiments.

[0118] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0119] The aforementioned computer-readable storage medium may be included in the range extender fault warning device; or it may exist independently and not be assembled into the range extender fault warning device.

[0120] The aforementioned computer-readable storage medium carries one or more programs that, when executed by the range extender fault warning device, enable the range extender fault warning device to write computer program code for performing the operations of this application in one or more programming languages ​​or a combination thereof. These programming languages ​​include object-oriented programming languages ​​such as Java, Smalltalk, and C++; and also conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network, such as a local area network (LAN) or a wide area network (WAN), or connected to an external computer (e.g., via the Internet using an Internet service provider).

[0121] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0122] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0123] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described range extender fault warning method, thereby solving the technical problem of how to accurately warn of range extender faults. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the range extender fault warning method provided in the above embodiments, and will not be repeated here.

[0124] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the range extender fault warning method described above.

[0125] The computer program product provided in this application can solve the technical problem of range extender fault warning. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the range extender fault warning method provided in the above embodiments, and will not be repeated here.

[0126] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for early warning of range extender faults, characterized in that, The method includes the following steps: Acquire the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender when it is in power generation mode; At each unit time interval, the average signal value of the upstream oxygen sensor is calculated based on the upstream oxygen sensor signal, and the voltage over-limit time ratio of the downstream oxygen sensor is calculated based on the downstream oxygen sensor voltage. The range extender is fault detected based on the average signal value and the voltage over-limit time ratio, and a fault warning is issued when the range extender has a fault. The voltage over-limit time ratio includes a first time ratio and a second time ratio. The step of calculating the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage includes: Within a unit time period, the proportion of the total time during which the voltage of the downstream oxygen sensor is lower than the first voltage threshold relative to the unit time period is calculated to obtain the first time ratio. Within a unit time period, the total duration during which the downstream oxygen sensor voltage is higher than the second voltage threshold is counted relative to the unit time period to obtain the second time ratio.

2. The range extender fault early warning method as described in claim 1, characterized in that, Before the step of acquiring the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in power generation mode, the method further includes: The rotational speed of the range extender is obtained, and the current state of the range extender is determined based on the rotational speed; If the current state is a power generation state, then the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender are acquired.

3. The range extender fault early warning method as described in claim 1, characterized in that, The step of fault detection of the range extender based on the average signal value and the voltage over-limit time ratio includes: When the average signal value is lower than the first signal threshold, the first number of abnormalities of the range extender within a first preset time period is counted according to the first time ratio. When the average signal value is higher than the second signal threshold, the number of second anomalies of the range extender within the second preset time period is counted according to the second time ratio. If the first number of abnormal occurrences is greater than the first threshold and / or the second number of abnormal occurrences is greater than the second threshold, then the range extender is determined to be faulty. If the first number of abnormalities is less than or equal to the first threshold and the second number of abnormalities is less than or equal to the second threshold, then the range extender is determined to be fault-free.

4. The range extender fault early warning method as described in claim 3, characterized in that, The step of counting the number of first anomalies of the range extender within a first preset time period based on the first time ratio when the average signal value is lower than the first signal threshold includes: When the average value of the signal is lower than the first signal threshold, if the first time ratio is higher than the first proportion threshold, an oxygen concentration anomaly is recorded. The first abnormality count is obtained by summing up all the abnormal oxygen concentration counts that occur in the range extender within a first preset time period. Wherein, the first signal threshold represents the critical value corresponding to determining that the mixed gas in the range extender is a lean mixture.

5. The range extender fault early warning method as described in claim 3, characterized in that, The step of counting the number of second anomalies of the range extender within a second preset time period based on the second time ratio when the average signal value is higher than the second signal threshold includes: When the average value of the signal is higher than the second signal threshold, if the second time ratio is higher than the second proportion threshold, then an abnormal fuel concentration is recorded. The number of times the range extender experiences fuel concentration anomalies within a second preset time period is summed to obtain the second anomaly count. The second signal threshold represents the critical value for determining that the mixed gas in the range extender is a rich mixture.

6. A range extender fault early warning device, characterized in that, The range extender fault early warning device includes: The data acquisition module is used to acquire the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender when it is in power generation mode. The data calculation module is used to calculate the average signal value of the upstream oxygen sensor based on the upstream oxygen sensor signal at each interval unit time, and to calculate the voltage over-limit time ratio of the downstream oxygen sensor based on the downstream oxygen sensor voltage. The fault detection module is used to detect faults in the range extender based on the average signal value and the voltage over-limit time ratio, and to issue a fault warning when the range extender has a fault. The data calculation module is also used for: Within a unit time period, the proportion of the total time during which the voltage of the downstream oxygen sensor is lower than the first voltage threshold relative to the unit time period is calculated to obtain the first time ratio. Within a unit time period, the total duration during which the downstream oxygen sensor voltage is higher than the second voltage threshold is counted relative to the unit time period to obtain the second time ratio.

7. A range extender fault early warning device, characterized in that, The device includes: a memory, a processor, and a range extender fault warning program stored in the memory and executable on the processor, the range extender fault warning program being configured to implement the steps of the range extender fault warning method as described in any one of claims 1 to 5.

8. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and the storage medium stores a range extender fault warning program. When the range extender fault warning program is executed by the processor, it implements the steps of the range extender fault warning method as described in any one of claims 1 to 5.

9. A computer program product, characterized in that, The computer program product includes a range extender fault warning program, which, when executed by a processor, implements the steps of the range extender fault warning method as described in any one of claims 1 to 5.

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