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

Abstract

The invention discloses a range extender fault early warning method, device and equipment, a storage medium and a computer program product, and relates to the technical field of range extenders, and the method comprises the following steps: obtaining an upstream oxygen sensor signal and a downstream oxygen sensor voltage output by a range extender in a power generation state; calculating a signal mean value of the upstream oxygen sensor according to the upstream oxygen sensor signal and calculating a voltage out-of-limit time ratio of the downstream oxygen sensor according to the downstream oxygen sensor voltage every unit time; and carrying out fault detection on the range extender based on the signal mean value and the voltage out-of-limit time, and sending out fault early warning when the range extender has a fault. The upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state are monitored, and the signal mean value and the voltage out-of-limit time ratio of each unit time interval are calculated, so that fault detection is periodically performed on the range extender; and the problem that the vehicle lies down due to the fact that the range extender cannot charge the power battery is solved.

Description

Technical Field

[0001] This application relates to the technical field of range extenders, and particularly to a method, device, equipment, storage medium, and computer program product for range extender fault warning. Background Art

[0002] With the increasing maturity of range extender technology, range-extended electric vehicles have developed vigorously in recent years, and range-extended electric vehicles have gradually become the main growth point in the automotive market. In the actual application scenarios of range-extended electric vehicles, even if there are some abnormalities and faults in the range extender, it is difficult to attract the attention of users because the power battery can still drive the vehicle to run normally.

[0003] However, when the power of the power battery is exhausted, if the fault of the range extender is still not discovered and processed, it will directly cause the range extender to be unable to charge the power battery, resulting in problems such as the vehicle breaking down. Therefore, how to accurately warn of the faults of the range extender is of great significance for improving the product quality, safety, and market competitiveness of range-extended electric vehicles. Summary of the Invention

[0004] The main purpose of this application is to provide a method, device, equipment, storage medium, and computer program product for range extender fault warning, aiming to solve the technical problem of how to accurately warn of the faults of the range extender.

[0005] To achieve the above purpose, this application provides a method for range extender fault warning, and the method includes the following steps:

[0006] Obtain the upstream oxygen sensor signal and downstream oxygen sensor voltage output by the range extender in the power generation state;

[0007] Every interval of a unit time, calculate the signal mean value of the upstream oxygen sensor according to the upstream oxygen sensor signal, and calculate the voltage over-limit time ratio of the downstream oxygen sensor according to the downstream oxygen sensor voltage;

[0008] Perform fault detection on the range extender based on the signal mean value and the voltage over-limit time ratio, and issue a fault warning when the range extender has a fault.

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

[0010] Obtain the rotation speed of the range extender, and determine the current state of the range extender according to the rotation speed;

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

[0012] In one embodiment, 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 according to the voltage of the downstream oxygen sensor includes:

[0013] Within a unit time period, statistically calculate the time ratio of the total duration during which the voltage of the downstream oxygen sensor is lower than a first voltage threshold to the unit time period to obtain the first time ratio;

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

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

[0016] When the signal mean value is lower than a first signal threshold, statistically calculate the first abnormal number of times of the range extender within a first preset duration according to the first time ratio;

[0017] When the signal mean value is higher than a second signal threshold, statistically calculate the second abnormal number of times of the range extender within a second preset duration according to the second time ratio;

[0018] If the first abnormal number of times is greater than a first number threshold and / or the second abnormal number of times is greater than a second number threshold, it is determined that the range extender has a fault;

[0019] If the first abnormal number of times is less than or equal to the first number threshold and the second abnormal number of times is less than or equal to the second number threshold, it is determined that the range extender has no fault.

[0020] In one embodiment, the step of, when the signal mean value is lower than the first signal threshold, statistically calculating the first abnormal number of times of the range extender within the first preset duration according to the first time ratio includes:

[0021] When the signal mean value is lower than the first signal threshold, if the first time ratio is higher than a first ratio threshold, record an oxygen concentration abnormality once;

[0022] Accumulate all the oxygen concentration abnormality times that occur within the first preset duration of the range extender to obtain the first abnormal number of times;

[0023] Wherein, the first signal threshold represents the critical value for determining that the air-fuel mixture in the range extender is a lean mixture.

[0024] In one embodiment, the step of, when the signal mean value is higher than the second signal threshold, statistically calculating the second abnormal number of times of the range extender within the second preset duration according to the second time ratio includes:

[0025] When the signal mean value is higher than the second signal threshold, if the second time ratio is higher than the second ratio threshold, record an abnormal fuel concentration once.

[0026] Accumulate all the abnormal fuel concentration times that occur in the range extender within the second preset duration to obtain the second abnormal time.

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

[0028] In addition, to achieve the above object, the present application also proposes a range extender fault warning device, and the range extender fault warning device includes:

[0029] A data acquisition module, configured to acquire the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state.

[0030] A data calculation module, configured to calculate the signal mean value of the upstream oxygen sensor every unit duration according to the upstream oxygen sensor signal, and calculate the voltage over-limit time ratio of the downstream oxygen sensor according to the downstream oxygen sensor voltage.

[0031] A fault detection module, configured to perform fault detection on the range extender based on the signal mean value and the voltage over-limit time ratio, and issue a fault warning when a fault exists in the range extender.

[0032] In addition, to achieve the above object, the present application also proposes a range extender fault warning device, and the device includes: a memory, a processor, and a range extender fault warning program stored on the memory and executable on the processor, and the range extender fault warning program is configured to implement the steps of the range extender fault warning method as described above.

[0033] In addition, to achieve the above object, the present application also proposes a storage medium, and the storage medium is a computer-readable storage medium, and a range extender fault warning program is stored on the storage medium, and when the range extender fault warning program is executed by a processor, it implements the steps of the range extender fault warning method as described above.

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

[0035] This application obtains the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state; at every interval of a unit time length, the signal mean value of the upstream oxygen sensor is calculated according to the upstream oxygen sensor signal, and the voltage over-limit time ratio of the downstream oxygen sensor is calculated according to the downstream oxygen sensor voltage; the range extender is subjected to fault detection based on the signal mean value and the voltage over-limit time ratio, and a fault warning is issued when a fault exists in the range extender. Since the upstream oxygen sensor signal and the downstream oxygen sensor can reflect the actual operation condition of the range extender, the above method of this application calculates the signal mean value and the voltage over-limit time ratio per unit time length by monitoring the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state, so that the working state of the range extender within a cycle of the unit time length can be accurately judged based on the signal mean value and the voltage over-limit time ratio, and further the fault detection of the range extender is realized periodically, avoiding problems such as the vehicle breaking down due to the range extender being unable to charge the power battery. Description of the Drawings

[0036] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0037] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

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

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

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

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

[0042] Figure 5 It is a schematic structural diagram of the range extender fault warning device in the hardware operating environment related to the solution of the embodiment of this application.

[0043] The realization, functional features and advantages of the purpose of this application will be further described with reference to the embodiments and the drawings. Detailed Embodiments

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

[0045] It should be noted that the execution subject of the embodiments of the present application can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of implementing the above functions, such as the above-mentioned range extender fault warning device. The following uses the range extender fault warning device as an example to illustrate the following embodiments.

[0046] The embodiments of the present application provide a range extender fault warning method. Refer to Figure 1 , Figure 1 which is a schematic flowchart of the first embodiment of the range extender fault warning method of the present application.

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

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

[0049] It can be understood that the above range extender is an auxiliary power device for extending the driving range of an electric vehicle. It can generate electricity by burning fuel (such as gasoline, diesel, natural gas, etc.), thereby extending the driving range of the electric vehicle. The range extender usually includes an engine and a generator. The engine is responsible for burning fuel to generate mechanical energy, and the generator can convert the mechanical energy of the engine into electrical energy to charge the battery or directly drive the motor. When the range extender performs the power generation operation for the power battery of the electric vehicle, it indicates that the range extender is in the power generation state. The above 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 called the front oxygen sensor) is installed on the exhaust manifold or exhaust pipe of the range extender, in front of the catalytic converter. The upstream oxygen sensor is mainly used to monitor whether the fuel mixture ratio (the ratio of air to fuel) of the engine is appropriate. Therefore, the upstream oxygen sensor signal directly affects the adjustment of the fuel injection amount and the intake air amount by the engine control unit, so as to achieve closed-loop control and ensure that the combustion is as close as possible to the ideal stoichiometric ratio. Among them, the upstream oxygen sensor signal can be voltage, pressure, etc., and this embodiment does not limit this.

[0051] The downstream oxygen sensor (also known as the post - oxygen sensor) is installed after the catalytic converter, near the end of the exhaust pipe. The downstream oxygen sensor is mainly used to monitor the working 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 and stores and releases oxygen during the process. Therefore, the voltage of the downstream oxygen sensor can be used to reflect whether the catalytic converter is working properly.

[0052] Step S20: At every interval of the unit time duration, calculate the signal mean value of the upstream oxygen sensor according to the upstream oxygen sensor signal, and calculate the voltage over - limit time ratio of the downstream oxygen sensor according to the voltage of the downstream oxygen sensor.

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

[0054] In specific implementation, the voltage of the downstream oxygen sensor can be sampled based on a fixed sampling period (such as 2 seconds, 5 seconds, etc.), and then by calculating the proportion of the total sampling period corresponding to all downstream oxygen sensor voltages exceeding the normal operating voltage within the unit time duration, the above - mentioned voltage over - limit time ratio can be obtained.

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

[0056] In specific implementation, it can be determined whether the range extender can normally perform charging operations on the power battery based on the above - mentioned signal mean value and voltage over - limit time ratio: If so, it can be determined that there is no fault in the range extender; if not, it can be determined that there is a fault in the range extender, and a fault warning is sent to the user and after - sales personnel to prompt the user to send the vehicle to the after - sales maintenance point for repair.

[0057] In this embodiment, the upstream oxygen sensor signal and the downstream oxygen sensor voltage output when the range extender is in the power generation state are acquired; every unit time interval, the signal mean value of the upstream oxygen sensor is calculated according to the upstream oxygen sensor signal, and the voltage over-limit time ratio of the downstream oxygen sensor is calculated according to the downstream oxygen sensor voltage; the range extender is subjected to fault detection based on the signal mean value and the voltage over-limit time ratio, and a fault warning is issued when a fault exists in the range extender. Since the upstream oxygen sensor signal and the downstream oxygen sensor can reflect the actual operation condition of the range extender, the above method in this embodiment calculates the signal mean value and the voltage over-limit time ratio per unit time interval by monitoring the upstream oxygen sensor signal and the downstream oxygen sensor voltage output when the range extender is in the power generation state, so that the working state of the range extender within a period of unit time can be accurately judged based on the signal mean value and the voltage over-limit time ratio, and further the range extender can be periodically subjected to fault detection, avoiding problems such as the vehicle breaking down due to the range extender being unable to charge the power battery.

[0058] Reference Figure 2 , Figure 2 is a schematic flowchart of the second embodiment of the method for warning of range extender faults in this application.

[0059] In a feasible implementation manner, before the step S10, the following may further be included:

[0060] Step S1: Obtain the rotation speed of the range extender, and determine the current state of the range extender according to the rotation speed.

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

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

[0063] It should be understood that since the problem to be solved in this application is that "when the power of the power battery is exhausted, if the fault of the range extender is still not discovered and processed, it will directly cause the range extender to be unable to charge the power battery, resulting in the vehicle breaking down". Based on this, in this embodiment, only the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state are acquired, and the data in the non-power generation state is meaningless for the subsequent fault analysis of the range extender, and even may cause the analysis result to deviate.

[0064] In a specific implementation, the range extender's speed can also be obtained from the vehicle network. After the range extender is started, the engine drives the generator, and the speed stabilizes 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 by design and is not limited here). At this point, the range extender's current state can be determined to be power generation. If the speed is not within this specific range, the range extender's current state can be determined to be non-power generation. Specifically, non-power generation states can include inactive, idling, or low-load states. A speed of 0 RPM indicates that the range extender is completely shut down, corresponding to the inactive state. A low speed (e.g., greater than 0 RPM and less than 2000 RPM, the specific value varies by design and is not limited here) indicates that the range extender may be idling or in a low-load state due to system self-test, preheating, or standby. In addition, when the speed exceeds a certain value (e.g., 5000 RPM, the specific value varies by design and is not limited here), it can be directly determined that the range extender has a fault.

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

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

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

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

[0069] It should be noted that the above-mentioned second time ratio represents the ratio of the total time that the downstream oxygen sensor operates at a voltage higher than the upper limit of the catalyst oxygen storage in the unit time, which reflects the fuel concentration in the range extender.

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

[0071] In this embodiment, the rotation speed of the range extender is obtained, and the current state of the range extender is determined according to the rotation speed. If the current state is the power generation state, the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender are obtained. Within a unit time period, the time ratio of the total duration during which the downstream oxygen sensor voltage is lower than the first voltage threshold to the unit time period is statistically calculated to obtain the first time ratio. Within a unit time period, the time ratio of the total duration during which the downstream oxygen sensor voltage is higher than the second voltage threshold to the unit time period is statistically calculated to obtain the second time ratio. The above method in this embodiment determines whether the range extender is generating power for the power battery according to the rotation speed of the range extender. If so, the upstream oxygen sensor signal and the downstream oxygen sensor voltage output are collected to provide a data basis for subsequent fault detection. If not, collection is not performed to avoid occupying unnecessary data resources. At the same time, the first time ratio of the total duration during which the downstream oxygen sensor voltage is lower than the first voltage threshold to the unit time period is statistically calculated, so as to accurately calculate the running time ratio of the range extender below the oxygen storage lower limit of the catalytic converter. The second time ratio of the total duration during which the downstream oxygen sensor voltage is higher than the second voltage threshold to the unit time period is statistically calculated, so as to accurately calculate the running time ratio of the range extender above the oxygen storage upper limit of the catalytic converter.

[0072] Reference Figure 3 , Figure 3 is a schematic flowchart of the third embodiment of the range extender fault warning method of the present application.

[0073] In a feasible implementation manner, the step S30 may include:

[0074] Step S301: When the signal mean value is lower than the first signal threshold, the first abnormal number of times of the range extender within the first preset duration is statistically calculated according to the first time ratio.

[0075] It should be understood that the above first abnormal number of times may represent the number of times of abnormal oxygen concentration in the range extender; the above first signal threshold represents the critical value for determining that the mixed gas in the range extender is a lean mixture, that is, when the signal mean value is lower than the first signal threshold, it can be determined that the mixed gas in the range extender is a lean mixture, that is, a mixture with relatively more air and relatively less fuel.

[0076] Step S302: When the signal mean value is higher than the second signal threshold, the second abnormal number of times of the range extender within the second preset duration is statistically calculated according to the second time ratio.

[0077] It should be understood that the above second abnormal number of times may represent the number of times of abnormal fuel concentration in the range extender; the above second signal threshold represents the critical value for determining that the mixed gas in the range extender is a rich mixture, that is, when the signal mean value is lower than the second signal threshold, it can be determined that the mixed gas in the range extender is a rich mixture, that is, a mixture with relatively more fuel and relatively less air.

[0078] Step S303: If the first abnormal count is greater than the first count threshold and / or the second abnormal count is greater than the second count threshold, it is determined that there is a fault in the range extender.

[0079] Step S304: If the first abnormal count is less than or equal to the first count threshold and the second abnormal count is less than or equal to the second count threshold, it is determined that there is no fault in the range extender.

[0080] It should be noted that both the above-mentioned first abnormal count and second abnormal count can be flexibly set, such as 3 times, 5 times, etc., and this embodiment does not limit this.

[0081] It should be understood that due to occasional data false alarms in the range extender, if it is determined that the range extender has a fault as soon as an abnormal count is found, it may occur that when the user sends the vehicle to the after-sales service shop for inspection, it is actually found to be a false alarm, thus affecting the user's driving experience. Therefore, in this embodiment, the first count threshold and the second count threshold are set. When the first abnormal count is greater than the first count threshold and / or the second abnormal count is greater than the second count threshold, it indicates that this is not an occasional false alarm at this time, so it can be determined that there is a fault in the range extender; when the first abnormal count is less than or equal to the first count threshold and the second abnormal count is less than or equal to the second count threshold, it indicates that this is an occasional false alarm at this time, so it can be determined that there is no fault in the range extender.

[0082] In a specific implementation, to avoid the first abnormal count and the second abnormal count in the current detection cycle affecting the fault detection in the next cycle, after determining that the range extender has a fault or no fault, it is necessary to clear the first abnormal count and the second abnormal count.

[0083] In a feasible implementation manner, the step S301 may include:

[0084] Step S3011: When the signal mean value is lower than the first signal threshold, if the first time ratio is higher than the first ratio threshold, record an oxygen concentration abnormality once.

[0085] Step S3012: Accumulate all the oxygen concentration abnormality counts that occur in the range extender within the first preset duration to obtain the first abnormal count.

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

[0087] In a specific implementation, when the signal mean value is lower than the first signal threshold, it indicates that the mixture gas in the range extender is a lean mixture. At this time, if the first time ratio is higher than the first ratio threshold, it means that the downstream oxygen sensor has been operating at a voltage condition lower than the oxygen storage lower limit of the catalytic converter for a long time. Therefore, an abnormal oxygen concentration may occur in the range extender.

[0088] In a feasible implementation manner, the step S302 may include:

[0089] Step S3021: When the signal mean value is higher than the second signal threshold, if the second time ratio is higher than the second ratio threshold, record an abnormal fuel concentration once.

[0090] In a specific implementation, when the signal mean value is higher than the second signal threshold, it indicates that the mixture gas in the range extender is a rich mixture. At this time, if the second time ratio is higher than the second ratio threshold, it means that the downstream oxygen sensor has been operating at a voltage condition higher than the oxygen storage upper limit of the catalytic converter for a long time. Therefore, an abnormal fuel concentration may occur in the range extender.

[0091] Step S3022: Accumulate all the abnormal fuel concentration times that occur in the range extender within the second preset duration to obtain the second abnormal number.

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

[0093] It should be understood that in this embodiment and the above embodiments, the setting of each threshold and preset value can be formulated based on the inspection of the state of range extenders of a large number of vehicles in the market and the analysis of the corresponding range extender operation data. Exemplarily, in the case of a whole vehicle matched with a 1.8L range extender with a rated power of 60kw, for the abnormal operation warning of the range extender, the preset duration t0 = 60s, the preset upstream oxygen sensor threshold P01 = 0.995, the upstream oxygen sensor threshold P02 = 1.005, the preset downstream oxygen sensor threshold V01 = 0.3V, the downstream oxygen sensor threshold V02 = 0.85V, the preset duration ratio e01 = 50%, the duration ratio 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 the case of a whole vehicle matched with a 2.0L range extender with a rated power of 100kw, regarding the abnormal operation warning of the range extender, the preset duration t0 = 60s, the preset upstream oxygen sensor threshold P01 = 0.995, the upstream oxygen sensor threshold P02 = 1.005, the preset downstream oxygen sensor threshold V01 = 0.3V, the downstream oxygen sensor threshold V02 = 0.85V, the preset duration ratio e01 = 50%, the duration ratio 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.

[0095] In the above two examples, 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 number threshold, n02 represents the second number threshold, t1 represents the first preset duration, and t2 represents the second preset duration.

[0096] In this embodiment, when the signal mean value is lower than the first signal threshold, if the first time ratio is higher than the first ratio threshold, an abnormal oxygen concentration is recorded once; all the abnormal oxygen concentration times occurring within the first preset duration of the range extender are accumulated to obtain the first abnormal times; wherein, the first signal threshold represents the critical value for determining that the mixed gas in the range extender is a lean mixture; when the signal mean value is higher than the second signal threshold, if the second time ratio is higher than the second ratio threshold, an abnormal fuel concentration is recorded once; all the abnormal fuel concentration times occurring within the second preset duration of the range extender are accumulated to obtain the second abnormal times; wherein, the second signal threshold represents the critical value for determining that the mixed gas in the range extender is a rich mixture; if the first abnormal times are greater than the first number threshold and / or the second abnormal times are greater than the second number threshold, it is determined that the range extender has a fault; if the first abnormal times are less than or equal to the first number threshold and the second abnormal times are less than or equal to the second number threshold, it is determined that the range extender has no fault. In the above method of this embodiment, when the signal mean value is lower than the first signal threshold (i.e., the mixed gas in the range extender is a lean mixture), by comparing the numerical value between the first time ratio and the first ratio threshold, it is determined whether there is an abnormal oxygen concentration in the range extender, and the abnormal times are accumulated, providing a data basis for subsequent judgment of whether the range extender has a fault; at the same time, when the signal mean value is lower than the second signal threshold (i.e., the mixed gas in the range extender is a rich mixture), by comparing the numerical value between the second time ratio and the second ratio threshold, it is determined whether there is an abnormal fuel concentration in the range extender, and the abnormal times are accumulated, providing a data basis for subsequent judgment of whether the range extender has a fault. In addition, since the range extender may have occasional data false alarms, this embodiment determines whether the range extender really has a fault by setting the first number threshold and the second number threshold, thus avoiding unnecessary influence on the user's journey caused by data false alarms.

[0097] Referring to Figure 4 , Figure 4 is the structural block diagram of the first embodiment of the range extender fault warning device of the present application.

[0098] As Figure 4 shown, the range extender fault warning device proposed in the embodiment of the present application includes:

[0099] A data acquisition module 401, configured to acquire the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender during the power generation state;

[0100] A data calculation module 402, configured to calculate the signal mean value of the upstream oxygen sensor every unit duration according to the upstream oxygen sensor signal, and calculate the voltage over-limit time ratio of the downstream oxygen sensor according to the downstream oxygen sensor voltage;

[0101] The fault detection module 403 is configured to perform fault detection on the range extender based on the signal mean value and the voltage overlimit time ratio, and issue a fault warning when a fault exists in the range extender.

[0102] In this embodiment, the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state are obtained; at every unit time interval, the signal mean value of the upstream oxygen sensor is calculated according to the upstream oxygen sensor signal, and the voltage overlimit time ratio of the downstream oxygen sensor is calculated according to the downstream oxygen sensor voltage; the range extender is subjected to fault detection based on the signal mean value and the voltage overlimit time ratio, and a fault warning is issued when a fault exists in the range extender. Since the upstream oxygen sensor signal and the downstream oxygen sensor can reflect the actual operation condition of the range extender, the above method in this embodiment calculates the signal mean value and the voltage overlimit time ratio at every unit time interval by monitoring the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state, so that the working state of the range extender within a cycle of unit time can be accurately judged based on the signal mean value and the voltage overlimit time ratio, and further the range extender can be periodically subjected to fault detection, thereby avoiding problems such as the vehicle being stranded due to the range extender being unable to charge the power battery.

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

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

[0105] Further, the voltage overlimit time ratio includes a first time ratio and a second time ratio. The data calculation module 402 is further configured to, within a unit time, count the time ratio of the total duration that the downstream oxygen sensor voltage is lower than a first voltage threshold relative to the unit time to obtain the first time ratio; within a unit time, count the time ratio of the total duration that the downstream oxygen sensor voltage is higher than a second voltage threshold relative to the unit time to obtain the second time ratio.

[0106] Further, the fault detection module 403 is further configured to, when the signal mean value is lower than the first signal threshold, count the first abnormal number of times of the range extender within a first preset duration according to the first time ratio; when the signal mean value is higher than the second signal threshold, count the second abnormal number of times of the range extender within a second preset duration according to the second time ratio; if the first abnormal number of times is greater than the first number threshold and / or the second abnormal number of times is greater than the second number threshold, it is determined that the range extender has a fault; if the first abnormal number of times is less than or equal to the first number threshold and the second abnormal number of times is less than or equal to the second number threshold, it is determined that the range extender has no fault.

[0107] Further, the fault detection module 403 is further configured to, when the signal mean value is lower than the first signal threshold, if the first time ratio is higher than the first ratio threshold, record an abnormal oxygen concentration once; accumulate all the abnormal oxygen concentration times that occur to the range extender within the first preset duration to obtain the first abnormal number of times; where the first signal threshold represents the critical value corresponding to determining that the mixed gas in the range extender is a lean mixture.

[0108] Further, the fault detection module 403 is further configured to, when the signal mean value is higher than the second signal threshold, if the second time ratio is higher than the second ratio threshold, record an abnormal fuel concentration once; accumulate all the abnormal fuel concentration times that occur to the range extender within the second preset duration to obtain the second abnormal number of times; where the second signal threshold represents the critical value corresponding to determining that the mixed gas in the range extender is a rich mixture.

[0109] For other embodiments or specific implementation manners of the range extender fault warning device of the present application, reference may be made to the above method embodiments, which will not be elaborated here.

[0110] The present application provides a range extender fault warning device, and the range extender fault warning device 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 first embodiment above.

[0111] Next, refer to Figure 5, which shows a schematic structural diagram of an extender fault warning device suitable for implementing the embodiments of the present application. The extender fault warning device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistant), PADs (Portable Application Description: tablet computers), PMPs (Portable Media Player), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 5 The shown extender fault warning device is merely an example and should not impose any limitations on the functions and usage scope of the embodiments of the present application.

[0112] As Figure 5 shown, the extender fault warning device may include a processing device 1001 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the program stored in the read-only memory 1002 or the program loaded from the storage device 1003 into the random access memory 1004. In the random access memory 1004, various programs and data required for the operation of the extender fault warning device are also stored. The processing device 1001, the read-only memory 1002, and the random access memory 1004 are connected to each other through a bus 1005. The input / output interface 1006 is also connected to the bus. Generally, the following systems may be connected to the input / output interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, magnetic tapes, hard disks, etc.; and a communication device 1009. The communication device 1009 can allow the extender fault warning device to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows an extender fault warning device with various systems, it should be understood that it is not required to implement or have all the shown systems. More or fewer systems may be implemented or had alternatively.

[0113] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by a processing device 1001, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are executed.

[0114] The range extender fault warning device provided by the present application adopts the range extender fault warning method in the above-mentioned embodiment, and can solve the technical problem of how to accurately warn of the faults of the range extender. Compared with the prior art, the beneficial effects of the range extender fault warning device provided by the present application are the same as those of the range extender fault warning method provided by the above-mentioned embodiment, and other technical features in the range extender fault warning device are the same as the features disclosed in the method of the previous embodiment, and will not be elaborated here.

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

[0116] As described above, this is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0117] The present application provides a computer-readable storage medium, which has computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the range extender fault warning method in the above-mentioned embodiment.

[0118] The computer-readable storage medium provided by this application can 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 of the above. More specific examples of computer-readable storage media can include, but are not limited to: electrical connections with 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 of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0119] The above computer-readable storage medium can be included in the range extender fault warning device; it can also exist independently without being assembled into the range extender fault warning device.

[0120] The above computer-readable storage medium carries one or more programs. When the above one or more programs are executed by the range extender fault warning device, the range extender fault warning device can write computer program code for performing the operations of this application in one or more programming languages or combinations thereof. The above programming languages include object-oriented programming languages such as Java, Smalltalk, C++; and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed completely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, such as through a local area network (LAN) or a wide area network (WAN), or connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

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

[0122] The modules described in the embodiments of the present application can be implemented in software or in hardware. In some cases, the name of the module does not constitute a limitation on the unit itself.

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

[0124] The present 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 as described above.

[0125] The computer program product provided by the present 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 by the present application are the same as those of the range extender fault warning method provided by the above embodiments, and will not be elaborated here.

[0126] The above are only some embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A method for warning of range extender faults, characterized in that, The method includes the following steps: Obtain the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state; At every interval of a unit time period, calculate the signal mean value of the upstream oxygen sensor according to the upstream oxygen sensor signal, and calculate the voltage overlimit time ratio of the downstream oxygen sensor according to the downstream oxygen sensor voltage; Perform fault detection on the range extender based on the signal mean value and the voltage overlimit time ratio, and issue a fault warning when a fault exists in the range extender.

2. The range extender fault warning method according to claim 1, wherein Before the step of obtaining the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state, it further includes: Obtain the rotational speed of the range extender, and determine the current state of the range extender according to the rotational speed; If the current state is the power generation state, obtain the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender.

3. The range extender fault warning method according to claim 1, wherein The voltage overlimit time ratio includes a first time ratio and a second time ratio. The step of calculating the voltage overlimit time ratio of the downstream oxygen sensor according to the downstream oxygen sensor voltage includes: Within a unit time period, count the time proportion of the total duration that the downstream oxygen sensor voltage is lower than a first voltage threshold relative to the unit time period to obtain the first time ratio; Within a unit time period, count the time proportion of the total duration that the downstream oxygen sensor voltage is higher than a second voltage threshold relative to the unit time period to obtain the second time ratio.

4. The range extender fault warning method according to claim 3, wherein, The step of performing fault detection on the range extender based on the signal mean value and the voltage overlimit time ratio includes: When the signal mean value is lower than a first signal threshold, count the first abnormal number of times of the range extender within a first preset time period according to the first time ratio; When the signal mean value is higher than a second signal threshold, count the second abnormal number of times of the range extender within a second preset time period according to the second time ratio; If the first abnormal number of times is greater than a first number threshold and / or the second abnormal number of times is greater than a second number threshold, it is determined that the range extender has a fault; If the first abnormal number of times is less than or equal to the first number threshold and the second abnormal number of times is less than or equal to the second number threshold, it is determined that the range extender has no fault.

5. The range extender fault warning method according to claim 4, wherein The step of when the signal mean value is lower than the first signal threshold, counting the first abnormal number of times of the range extender within the first preset time period according to the first time ratio includes: When the signal mean value is lower than the first signal threshold, if the first time ratio is higher than a first proportion threshold, record an oxygen concentration abnormality once; Accumulate all the oxygen concentration abnormality times that occur within the first preset time period of the range extender to obtain the first abnormal number of times; Wherein, the first signal threshold represents the critical value for determining that the mixture gas in the range extender is a lean mixture gas.

6. The range extender fault warning method according to claim 4, characterized in that, The step of when the signal mean value is higher than the second signal threshold, counting the second abnormal number of times of the range extender within the second preset time period according to the second time ratio includes: When the signal mean value is higher than the second signal threshold, if the second time ratio is higher than a second proportion threshold, record a fuel concentration abnormality once; Accumulate all the abnormal fuel concentration occurrences of the range extender within the second preset duration to obtain the second abnormal count; Among them, the second signal threshold represents the critical value for determining that the mixed gas in the range extender is a rich mixture.

7. A range extender fault warning device, characterized in that, The range extender fault warning device includes: A data acquisition module, configured to acquire the upstream oxygen sensor signal and the downstream oxygen sensor voltage output by the range extender in the power generation state; A data calculation module, configured to calculate the signal mean value of the upstream oxygen sensor according to the upstream oxygen sensor signal and calculate the voltage overlimit time ratio of the downstream oxygen sensor according to the downstream oxygen sensor voltage at every interval of the unit duration; A fault detection module, configured to perform fault detection on the range extender based on the signal mean value and the voltage overlimit time ratio, and issue a fault warning when a fault exists in the range extender.

8. An extender fault warning device, characterized in that, The device includes: a memory, a processor, and a range extender fault warning program stored on the memory and executable on the processor, and the range extender fault warning program is configured to implement the steps of the range extender fault warning method according to any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a range extender fault warning program is stored on the storage medium. When the range extender fault warning program is executed by a processor, the steps of the range extender fault warning method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that, The computer program product includes a range extender fault warning program. When the range extender fault warning program is executed by a processor, the steps of the range extender fault warning method according to any one of claims 1 to 6 are implemented.

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