Coupling failure determination method for range extender and related device

Abstract

The invention discloses a coupling failure determination method for a range extender and a related device, and the method comprises the steps: obtaining the actual torque of an engine, the actual rotating speed of the engine, the actual torque of a generator and the actual rotating speed of the generator in real time when the range extender has a power generation demand; on the basis of the actual torque of the engine, the actual torque of the generator and a preset torque threshold value, whether power generation of the range extender is abnormal or not is determined; and based on the actual rotating speed of the engine, the actual rotating speed of the generator and a preset rotating speed threshold value, whether the range extender generates electricity abnormally or not is determined. Therefore, when the range extender generates power, the torque and the rotating speed are continuously collected in real time, so that whether the range extender generates power abnormally or not is judged in time and accurately, problems can be found in advance to a certain extent, and a coupler used by the range extender is prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the field of engines, and in particular to a method for determining failure of a coupling for a range extender and a related device. Background Art

[0002] The coupling is a key component in the range extender that connects the engine and the generator and transmits power. During the range extender power generation process, if the engine and the generator speed deviate too much, the coupling elastic body will deform greatly and generate too much heat, which will reduce the bearing strength of the coupling and eventually cause the coupling to fail. Therefore, how to detect risk points in advance (i.e., the coupling may fail) and effectively avoid damage to the coupling has become a technical problem that needs to be solved urgently by people in this field. Summary of the invention

[0003] In view of the above problems, the present invention provides a method for determining failure of a coupling for a range extender and a related device that overcomes the above problems or at least partially solves the above problems.

[0004] In a first aspect, a method for determining failure of a coupling for a range extender includes:

[0005] When the range extender has a power generation demand, the actual torque of the engine, the actual speed of the engine, the actual torque of the generator and the actual speed of the generator are obtained in real time;

[0006] determining whether the range extender generates power abnormally based on the actual torque of the engine, the actual torque of the generator and a preset torque threshold;

[0007] Based on the actual rotation speed of the engine, the actual rotation speed of the generator and a preset rotation speed threshold, it is determined whether the range extender generates power abnormally.

[0008] Optionally, in certain optional embodiments, before obtaining the actual torque of the engine, the actual speed of the engine, the actual torque of the generator, and the actual speed of the generator in real time when the range extender has a power generation demand, the method further includes:

[0009] Determine whether the range extender needs to generate electricity based on the battery state of charge (SOC) of the power battery, the discharge power of the power battery, and the power demand of the vehicle's drive motor;

[0010] If the battery state of charge SOC of the power battery is lower than a preset charge threshold, it is determined that the range extender has a power generation demand;

[0011] Alternatively, if the discharge power of the power battery is lower than the power requirement of the vehicle drive motor, it is determined that the range extender has a power generation demand.

[0012] Optionally, in some optional embodiments, when the range extender has a power generation demand, obtaining the actual torque of the engine, the actual speed of the engine, the actual torque of the generator, and the actual speed of the generator in real time includes:

[0013] When the range extender has a power generation demand, a first actual torque of the engine at a first moment, a second actual torque of the engine at a second moment, a third actual torque of the generator at the first moment, a fourth actual torque of the generator at the second moment, a first actual speed of the engine at the first moment, a second actual speed of the engine at the second moment, a third actual speed of the generator at the first moment, and a fourth actual speed of the generator at the second moment are obtained in real time, wherein the second moment is later than the first moment.

[0014] Optionally, in some optional embodiments, determining whether the range extender generates power abnormally based on the actual torque of the engine, the actual torque of the generator and a preset torque threshold comprises:

[0015] calculating a difference between the second actual torque and the first actual torque to obtain a first torque difference;

[0016] calculating a difference between the fourth actual torque and the third actual torque to obtain a second torque difference;

[0017] Based on the first torque difference, the second torque difference, and the torque threshold, it is determined whether power generation of the range extender is abnormal.

[0018] Optionally, in some optional implementations, determining whether the range extender generates power abnormally based on the first torque difference, the second torque difference and the torque threshold includes:

[0019] calculating a difference between an absolute value of the first torque difference and an absolute value of the second torque difference to obtain a third torque difference;

[0020] If the absolute values ​​of the plurality of third torque differences calculated multiple times within the preset time period are all greater than the torque threshold, it is determined that the range extender has power generation abnormality.

[0021] Optionally, in some optional embodiments, determining whether the range extender generates power abnormally based on the actual speed of the engine, the actual speed of the generator and a preset speed threshold includes:

[0022] calculating a difference between the first actual speed and the third actual speed to obtain a first speed difference;

[0023] calculating a difference between the second actual speed and the fourth actual speed to obtain a second speed difference;

[0024] Based on the first speed difference, the second speed difference and the speed threshold, it is determined whether the range extender generates power abnormally.

[0025] Optionally, in some optional implementations, determining whether the range extender generates power abnormally based on the first speed difference, the second speed difference and the speed threshold includes:

[0026] If there are positive and negative values ​​among the multiple first speed differences and the multiple second speed differences calculated multiple times within the preset time length, and the absolute values ​​of the multiple first speed differences and the multiple second speed differences are all greater than the speed threshold, it is determined that the range extender has abnormal power generation.

[0027] In a second aspect, a coupling failure determination device for a range extender includes: a parameter acquisition unit, a torque determination unit, and a rotation speed determination unit;

[0028] The parameter acquisition unit is used to obtain the actual torque of the engine, the actual speed of the engine, the actual torque of the generator and the actual speed of the generator in real time when the range extender has a power generation demand;

[0029] The torque judgment unit is used to determine whether the range extender generates power abnormally based on the actual torque of the engine, the actual torque of the generator and a preset torque threshold;

[0030] The speed determination unit is used to determine whether the range extender generates power abnormally based on the actual speed of the engine, the actual speed of the generator and a preset speed threshold.

[0031] In a third aspect, a computer-readable storage medium stores a program thereon, wherein when the program is executed by a processor, the method for determining failure of a coupling for a range extender as described in any one of the above items is implemented.

[0032] In a fourth aspect, an electronic device comprises at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other via the bus; and the processor is used to call program instructions in the memory to execute any one of the above-mentioned methods for determining failure of a coupling for a range extender.

[0033] By means of the above technical scheme, the present invention provides a method for determining failure of a coupling for a range extender and a related device, which can obtain the actual torque of the engine, the actual speed of the engine, the actual torque of the generator and the actual speed of the generator in real time when the range extender has a power generation demand; based on the actual torque of the engine, the actual torque of the generator and the preset torque threshold, determine whether the range extender is generating power abnormally; based on the actual speed of the engine, the actual speed of the generator and the preset speed threshold, determine whether the range extender is generating power abnormally. It can be seen from this that the present invention continuously collects torque and speed in real time when the range extender is generating power, so as to determine whether the range extender is generating power abnormally, which is relatively timely and accurate, and can detect problems in advance to a certain extent, avoiding damage to the coupling used in the range extender.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0036] Figure 1 A flow chart showing a first method for determining failure of a coupling for a range extender provided by the present invention is shown;

[0037] Figure 2 A schematic structural diagram of a range extender provided by the present invention is shown;

[0038] Figure 3 A flow chart showing a second method for determining failure of a coupling for a range extender provided by the present invention is shown;

[0039] Figure 4 A flow chart showing a third method for determining failure of a coupling for a range extender provided by the present invention is shown;

[0040] Figure 5 A flow chart showing a fourth method for determining failure of a coupling for a range extender provided by the present invention is shown;

[0041] Figure 6 A schematic structural diagram of a coupling failure determination device for a range extender provided by the present invention is shown;

[0042] Figure 7 A structural schematic diagram of an electronic device provided by the present invention is shown. DETAILED DESCRIPTION

[0043] The coupling is a key component in the range extender that connects the engine and generator and transmits power. During the power generation process of the range extender, if the speed deviation between the engine and the generator is too large, it will cause the coupling elastomer to deform greatly and generate excessive heat, thereby reducing the bearing strength of the coupling and eventually causing the coupling to fail.

[0044] The engine and generator are directly connected through a coupling. Although the coupling has a certain amount of elastic deformation, after entering the normal power generation process, the coupling can be understood as a rigid part. During operation, the speed of the engine and generator is basically the same, the torque is one positive and one negative, and the absolute value of the torque is also basically the same.

[0045] The inventor of the present invention has found through research that there are many reasons for the large deviation in the speed of the engine and the generator, one of which is that the actual power generation torque changes of the engine and the generator are not synchronized.

[0046] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0047] like Figure 1 As shown, the present invention provides a method for determining failure of a coupling for a range extender, comprising: S100, S200 and S300;

[0048] S100, when the range extender has a power generation demand, obtaining in real time the actual torque of the engine, the actual speed of the engine, the actual torque of the generator, and the actual speed of the generator;

[0049] Optionally, the range extender referred to in the present invention refers to the range extender used in new energy vehicles, and its structure is as follows: Figure 2 As shown, the present invention will not be described in detail.

[0050] It should be noted that: when the range extender has a demand for power generation, it means that the range extender is generating or is about to generate power. As mentioned above, when the range extender generates power, the engine and the generator can be understood as a rigid connection, that is, under normal circumstances, the speed of the generator and the engine should be consistent, and the torque should also be consistent. Therefore, the present invention can collect the speed and torque of the engine and the generator in real time, so as to facilitate the subsequent judgment of whether the power generation of the range extender is abnormal, and the present invention does not limit this.

[0051] Optionally, there are multiple ways to know whether the range extender has a demand for power generation, and any feasible way falls within the protection scope of the present invention.

[0052] For example, in some optional embodiments, before S100, the method further includes: step 1.1, step 1.2 and step 1.3;

[0053] Step 1.1, according to the battery state of charge SOC of the power battery, the discharge power of the power battery and the power demand of the vehicle drive motor, determine whether the range extender has a power generation demand;

[0054] Optionally, the battery state of charge (SOC) of the power battery and the discharge power of the power battery can be acquired through a battery management system. The power demand of the vehicle drive motor can be acquired through a motor controller, which is not limited in the present invention.

[0055] Step 1.2: If the battery state of charge SOC of the power battery is lower than a preset charge threshold, it is determined that the range extender has a power generation demand;

[0056] Optionally, if the battery state of charge SOC of the power battery is lower than a preset charge threshold, it means that the power of the power battery is low and the range extender is required to generate electricity to charge the power battery, that is, there is a demand for power generation, which is not limited in the present invention.

[0057] Step 1.3: Or if the discharge power of the power battery is lower than the power requirement of the vehicle drive motor, it is determined that the range extender has a power generation demand.

[0058] Optionally, if the discharge power of the power battery is lower than the power requirement of the vehicle drive motor, it means that the power battery is low and there is no way to provide higher power. The power battery needs to be charged, that is, there is a demand for power generation, which is not limited by the present invention.

[0059] Optional, such as Figure 3 As shown, in some optional embodiments, the S100 includes: S110;

[0060] S110. When the range extender has a power generation demand, a first actual torque of the engine at a first moment, a second actual torque of the engine at a second moment, a third actual torque of the generator at the first moment, a fourth actual torque of the generator at the second moment, a first actual speed of the engine at the first moment, a second actual speed of the engine at the second moment, a third actual speed of the generator at the first moment, and a fourth actual speed of the generator at the second moment are obtained in real time, wherein the second moment is later than the first moment.

[0061] Optionally, after determining that the range extender has a demand for power generation, the present invention can continuously obtain the torque (including the torque of the engine and the torque of the generator) and the speed (including the speed of the engine and the speed of the generator) at multiple moments in real time, so as to facilitate the subsequent calculation of the torque difference and the speed difference between the two moments. The present invention does not impose any limitation on this.

[0062] For example, the present invention can record the actual torque and the actual speed once per second, and continuously record the preset time length, so as to subsequently calculate how many times the target condition is reached within the preset time length, so as to determine whether the range extender has abnormal power generation. The present invention does not impose any limitation on this.

[0063] That is, in practice, the present invention not only obtains data at the first moment and the second moment, but also obtains actual torque and actual speed at multiple moments such as the third moment, the fourth moment, the fifth moment, and the sixth moment, and the present invention does not impose any limitation on this.

[0064] S200, determining whether the range extender generates power abnormally based on the actual torque of the engine, the actual torque of the generator and a preset torque threshold;

[0065] Optional, such as Figure 4 As shown, in some optional embodiments, the S200 includes: S210, S220 and S230;

[0066] S210, calculating a difference between the second actual torque and the first actual torque to obtain a first torque difference;

[0067] S220, calculating a difference between the fourth actual torque and the third actual torque to obtain a second torque difference;

[0068] S230: Determine whether the range extender generates power abnormally based on the first torque difference, the second torque difference, and the torque threshold.

[0069] For example, at time T1, the actual torque of the engine Engtrqact_1 and the actual torque of the generator MTtrqact_1 are recorded; at time T2, the actual torque of the engine Engtrqact_2 and the actual torque of the generator MTtrqact_2 are recorded.

[0070] Calculation: △Engtrq=Engtrqact_2-Engtrqact_1.

[0071] Calculation: △MTtrq=MTtrqact_2-MTtrqact_1.

[0072] If the absolute value of the difference between △Engtrq and △MTtrq is greater than △trq (torque threshold, which is related to the required power generation. The greater the required power generation, the larger the value can be calibrated to be), and it occurs multiple times within a certain time T (the specific number of times and the certain time T can be calibrated according to actual needs. For example, the absolute value of the difference between △Engtrq and △MTtrq is greater than △trq three times within one second), it means that the range extender may have abnormal power generation. At this time, the abnormal power generation fault of the range extender can be reported, and the present invention does not limit this.

[0073] For another example, the power generation demand of the range extender is 100kW. According to the power generation value, it can be obtained that the power generation demand speed is 1400 rpm and the power generation demand torque is 700Nm.

[0074] The actual operating speed of the current range extender is 1000 rpm, and the actual power generation torque is 500Nm. In order to meet the power generation demand, the range extender needs to adjust from the current speed and torque value to the required speed and torque value.

[0075] Assuming that time T1 is the current time, the actual torques of the engine and generator recorded at this time are 500Nm and -500Nm respectively, that is, Engtrqact_1=500Nm, Mttrqact_1=-500Nm.

[0076] At time T2 after 100ms, the actual torques of the engine and generator are recorded as 550Nm and -560Nm respectively, that is, Engtrqact_2=550Nm, Mttrqact_2=-560Nm.

[0077] Calculate △Engtrq=550Nm-500Nm=50Nm; △MTtrq=-560Nm-(-500Nm)=-60Nm, and the absolute value is 60Nm; the difference between △Engtrq and △MTtrq is -10Nm, and the absolute value is 10Nm.

[0078] △trq is related to the power generation. The calibrated 100kW corresponds to 100Nm, 200kW corresponds to 300Nm, and 50kW corresponds to 60Nm. This value can be obtained through multiple test calibrations on the bench test.

[0079] 10Nm is less than 100Nm, so it is considered that there is no risk and no need to report a fault.

[0080] If at time T2, the actual torques of the engine and generator are recorded as 750Nm and -560Nm respectively, that is, Engtrqact_2=750Nm, Mttrqact_2=-560Nm.

[0081] Calculate △Engtrq=750Nm-500Nm=250Nm; △MTtrq=-560Nm-(-500Nm)=-60Nm, and the absolute value is 60Nm; the difference between △Engtrq and △MTtrq is 250Nm-60Nm=190Nm, 190Nm is greater than 100Nm, it can be considered that the adjustment of the power generation torque is abnormal. If it occurs more than 3 times within the preset time T (1s), it is necessary to report the abnormal power generation fault of the range extender.

[0082] That is, in some optional embodiments, the S230 includes: step 3.1 and step 3.2;

[0083] Step 3.1, calculating the difference between the absolute value of the first torque difference and the absolute value of the second torque difference to obtain a third torque difference;

[0084] Step 3.2: If the absolute values ​​of the third torque differences calculated multiple times within the preset time period are all greater than the torque threshold, it is determined that the range extender has power generation abnormality.

[0085] S300: Determine whether the range extender generates power abnormally based on the actual speed of the engine, the actual speed of the generator, and a preset speed threshold.

[0086] For example, Figure 5 As shown, in some optional embodiments, the S300 includes: S310, S320 and S330;

[0087] S310, calculating a difference between the first actual speed and the third actual speed to obtain a first speed difference;

[0088] S320, calculating a difference between the second actual speed and the fourth actual speed to obtain a second speed difference;

[0089] S330: Determine whether the range extender generates power abnormally based on the first speed difference, the second speed difference and the speed threshold.

[0090] For example, at time T1, the actual speed of the engine Engnact_1 and the actual speed of the generator MTnact_1 are recorded; at time T2, the actual speed of the engine Engnact_2 and the actual speed of the generator MTnact_2 are recorded.

[0091] Calculation: △n1=Engnact_1-MTnact_1.

[0092] Calculation: △n2=Engnact_2-MTnact_2.

[0093] If within the preset time T, the difference between the actual speed of the engine and the actual speed of the generator is both positive (greater than 0) and negative (less than 0), and the absolute value of the difference is greater than △n (speed threshold, which is related to the required power generation. The greater the required power generation, the larger the value can be calibrated).

[0094] For another example, the power generation demand of the range extender is 100kW. According to the power generation value, it can be obtained that the power generation demand speed is 1400 rpm and the power generation demand torque is 700Nm.

[0095] The actual operating speed of the current range extender is 1000 rpm, and the actual power generation torque is 500Nm. In order to meet the power generation demand, the range extender needs to adjust from the current speed and torque values ​​to the required speed and torque values.

[0096] Assume that time T1 is the current time, then the actual speeds of the engine and generator recorded at this time are 1000 rpm and 1000 rpm respectively, that is, Engnact_1=1000 rpm, Mtnact_1=-1000 rpm, and △n1=0 is calculated.

[0097] At time T2 after 100ms, the actual speeds of the engine and generator are recorded as 1050 rpm and 1070 rpm respectively, and △n2=1070-1050=20 rpm is calculated.

[0098] At time T3, 100ms later, the actual speeds of the engine and generator are recorded as 1100 rpm and 1080 rpm respectively, and △n3=1080-1100=-20 rpm is calculated.

[0099] △n2 and △n3 have both positive and negative values, and are absolutely greater than 15 revolutions, and are within the preset time T (0.5s). At this time, it is necessary to report abnormal power generation failure of the range extender.

[0100] △n is related to the power generation. The calibrated value ≤100kW corresponds to 15 turns N, and 200kW corresponds to 20 turns N. This value can be obtained through multiple test calibrations on the bench test.

[0101] That is, in some optional embodiments, the S330 includes: step 4.1;

[0102] Step 4.1: If there are positive and negative values ​​among the multiple first speed differences and multiple second speed differences calculated multiple times within a preset time period, and the absolute values ​​of the multiple first speed differences and multiple second speed differences are all greater than the speed threshold, it is determined that the range extender has abnormal power generation.

[0103] like Figure 6As shown, the present invention provides a coupling failure determination device for a range extender, comprising: a parameter obtaining unit 100, a torque determination unit 200 and a rotation speed determination unit 300;

[0104] The parameter obtaining unit 100 is used to obtain the actual torque of the engine, the actual speed of the engine, the actual torque of the generator and the actual speed of the generator in real time when the range extender has a power generation demand;

[0105] The torque judgment unit 200 is used to determine whether the range extender generates power abnormally based on the actual torque of the engine, the actual torque of the generator and a preset torque threshold;

[0106] The speed determination unit 300 is used to determine whether the range extender generates power abnormally based on the actual speed of the engine, the actual speed of the generator and a preset speed threshold.

[0107] Optionally, in certain optional embodiments, the device further comprises: a power generation demand judgment unit, a first result unit, and a second result unit;

[0108] The power generation demand judgment unit is used to determine whether the range extender has a power generation demand according to the battery state of charge SOC of the power battery, the discharge power of the power battery and the power demand of the vehicle drive motor before obtaining the actual torque of the engine, the actual speed of the engine, the actual torque of the generator and the actual speed of the generator in real time when the range extender has a power generation demand;

[0109] The first result unit is used to determine that the range extender has a power generation demand if the battery state of charge SOC of the power battery is lower than a preset charge threshold;

[0110] The second result unit is used to determine that the range extender has a power generation demand if the discharge power of the power battery is lower than the power demand of the vehicle drive motor.

[0111] Optionally, in some optional implementations, the parameter obtaining unit 100 includes: a parameter obtaining subunit;

[0112] The parameter acquisition subunit is used to obtain in real time, when the range extender has a power generation demand, a first actual torque of the engine at a first moment, a second actual torque of the engine at a second moment, a third actual torque of the generator at the first moment, a fourth actual torque of the generator at the second moment, a first actual speed of the engine at the first moment, a second actual speed of the engine at the second moment, a third actual speed of the generator at the first moment, and a fourth actual speed of the generator at the second moment, wherein the second moment is later than the first moment.

[0113] Optionally, in some optional embodiments, the torque judgment unit 200 includes: a first torque difference calculation subunit, a second torque difference calculation subunit and a torque judgment subunit;

[0114] The first torque difference calculation subunit is used to calculate the difference between the second actual torque and the first actual torque to obtain a first torque difference;

[0115] The second torque difference calculation subunit is used to calculate the difference between the fourth actual torque and the third actual torque to obtain a second torque difference;

[0116] The torque judgment subunit is used to determine whether the range extender has abnormal power generation based on the first torque difference, the second torque difference and the torque threshold.

[0117] Optionally, in certain optional embodiments, the torque judgment subunit includes: a third torque difference calculation subunit and a first power generation abnormality subunit;

[0118] The third torque difference calculation subunit is used to calculate the difference between the absolute value of the first torque difference and the absolute value of the second torque difference to obtain a third torque difference;

[0119] The first power generation abnormality subunit is used to determine that the power generation of the range extender is abnormal if the absolute values ​​of multiple third torque differences calculated multiple times within a preset time period are all greater than the torque threshold.

[0120] Optionally, in some optional embodiments, the speed determination unit 300 includes: a first speed difference calculation subunit, a second speed difference calculation subunit and a speed determination subunit;

[0121] The first speed difference calculation subunit is used to calculate the difference between the first actual speed and the third actual speed to obtain a first speed difference;

[0122] The second speed difference calculation subunit is used to calculate the difference between the second actual speed and the fourth actual speed to obtain a second speed difference;

[0123] The speed determination subunit is used to determine whether the range extender has abnormal power generation based on the first speed difference, the second speed difference and the speed threshold.

[0124] Optionally, in certain optional embodiments, the speed determination subunit includes: a second power generation abnormality subunit;

[0125] The second power generation abnormality subunit is used to determine that the range extender has power generation abnormality if there are positive values ​​and negative values ​​among the multiple first speed differences and the multiple second speed differences calculated multiple times within a preset time length, and the absolute values ​​of the multiple first speed differences and the multiple second speed differences are all greater than the speed threshold.

[0126] The present invention provides a computer-readable storage medium having a program stored thereon, and when the program is executed by a processor, the method for determining failure of a coupling for a range extender as described in any one of the above is implemented.

[0127] like Figure 7 As shown, the present invention provides an electronic device 70, which includes at least one processor 701, and at least one memory 702 and a bus 703 connected to the processor 701; wherein the processor 701 and the memory 702 communicate with each other through the bus 703; the processor 701 is used to call the program instructions in the memory 702 to execute any of the above-mentioned methods for determining the failure of a coupling for a range extender.

[0128] In the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0129] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0130] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in the present invention, but will conform to the widest scope consistent with the principles and novel features disclosed in the present invention.

[0131] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for determining failure of a coupling for a range extender, characterized in that: include: When the range extender has a power generation demand, the actual torque of the engine, the actual speed of the engine, the actual torque of the generator and the actual speed of the generator are obtained in real time; determining whether the range extender generates power abnormally based on the actual torque of the engine, the actual torque of the generator and a preset torque threshold; Based on the actual rotation speed of the engine, the actual rotation speed of the generator and a preset rotation speed threshold, it is determined whether the range extender generates power abnormally.

2. The method according to claim 1, characterized in that Before obtaining the actual torque of the engine, the actual speed of the engine, the actual torque of the generator, and the actual speed of the generator in real time when the range extender has a power generation demand, the method further includes: Determine whether the range extender needs to generate electricity based on the battery state of charge (SOC) of the power battery, the discharge power of the power battery, and the power demand of the vehicle's drive motor; If the battery state of charge SOC of the power battery is lower than a preset charge threshold, it is determined that the range extender has a power generation demand; Alternatively, if the discharge power of the power battery is lower than the power requirement of the vehicle drive motor, it is determined that the range extender has a power generation demand.

3. The method according to claim 1, characterized in that When the range extender has a power generation demand, the actual torque of the engine, the actual speed of the engine, the actual torque of the generator and the actual speed of the generator are obtained in real time, including: When the range extender has a power generation demand, a first actual torque of the engine at a first moment, a second actual torque of the engine at a second moment, a third actual torque of the generator at the first moment, a fourth actual torque of the generator at the second moment, a first actual speed of the engine at the first moment, a second actual speed of the engine at the second moment, a third actual speed of the generator at the first moment, and a fourth actual speed of the generator at the second moment are obtained in real time, wherein the second moment is later than the first moment.

4. The method according to claim 3, characterized in that The determining whether the range extender generates power abnormally based on the actual torque of the engine, the actual torque of the generator and a preset torque threshold comprises: calculating a difference between the second actual torque and the first actual torque to obtain a first torque difference; calculating a difference between the fourth actual torque and the third actual torque to obtain a second torque difference; Based on the first torque difference, the second torque difference, and the torque threshold, it is determined whether power generation of the range extender is abnormal.

5. The method according to claim 4, characterized in that The determining whether the range extender generates power abnormally based on the first torque difference, the second torque difference and the torque threshold comprises: calculating a difference between an absolute value of the first torque difference and an absolute value of the second torque difference to obtain a third torque difference; If the absolute values ​​of the plurality of third torque differences calculated multiple times within the preset time period are all greater than the torque threshold, it is determined that the range extender has power generation abnormality.

6. The method according to claim 3, characterized in that The determining whether the range extender generates power abnormally based on the actual speed of the engine, the actual speed of the generator and a preset speed threshold comprises: calculating a difference between the first actual speed and the third actual speed to obtain a first speed difference; calculating a difference between the second actual speed and the fourth actual speed to obtain a second speed difference; Based on the first speed difference, the second speed difference and the speed threshold, it is determined whether the range extender generates power abnormally.

7. The method according to claim 6, characterized in that The determining whether the range extender generates power abnormally based on the first speed difference, the second speed difference and the speed threshold comprises: If there are positive and negative values ​​among the multiple first speed differences and the multiple second speed differences calculated multiple times within the preset time length, and the absolute values ​​of the multiple first speed differences and the multiple second speed differences are all greater than the speed threshold, it is determined that the range extender has abnormal power generation.

8. A coupling failure determination device for a range extender, characterized in that: include: Parameter acquisition unit, torque judgment unit and speed judgment unit; The parameter acquisition unit is used to obtain the actual torque of the engine, the actual speed of the engine, the actual torque of the generator and the actual speed of the generator in real time when the range extender has a power generation demand; The torque judgment unit is used to determine whether the range extender generates power abnormally based on the actual torque of the engine, the actual torque of the generator and a preset torque threshold; The speed determination unit is used to determine whether the range extender generates power abnormally based on the actual speed of the engine, the actual speed of the generator and a preset speed threshold.

9. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the method for determining failure of a coupling for a range extender according to any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: The electronic device includes at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the method for determining failure of a coupling for a range extender as described in any one of claims 1 to 7.

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