Contactor sintering detection method and device and vehicle

Abstract

The invention provides a contactor sintering detection method and device and a vehicle. The contactor sintering detection method comprises the steps that voltage is applied to the two ends of a contactor, the current value of an induction coil of the contactor is obtained, and it is determined that the contactor is sintered according to the change of the current value. According to the contactor sintering detection method and device and the vehicle, voltage is applied to the two ends of the contactor, it is determined that the contactor is sintered according to the change of the current value, and the detection reliability is high.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and more specifically to a contactor sintering detection method, device and vehicle. Background Art

[0002] With the popularity of new energy vehicles, contactors are widely used in high-voltage platforms of new energy vehicles due to their low conduction and high withstand voltage performance. Their performance and reliability directly affect the performance and reliability of the entire high-voltage system. The current method for detecting sintering of contactors in electric vehicles is usually to collect voltage signals under a certain state to determine whether the contactor is sintered. The above method uses different characteristics of contactor voltage signals to determine contactor sintering. For example, in special vehicle operating conditions (such as load dumping, load reverse drag or discharge delay, etc.), sintering may be falsely reported, so the detection reliability is poor. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, a contactor sintering detection method, device and vehicle are proposed, which have high detection reliability.

[0004] In order to solve the above problems, the first object of the present invention is to provide a contactor sintering detection method, comprising:

[0005] applying a voltage to both ends of the contactor;

[0006] Obtaining a current value of the induction coil of the contactor;

[0007] The sintering of the contactor is determined according to a change in the current value of the induction coil.

[0008] As an implementable manner, determining that the contactor is sintered according to a change in the current value of the induction coil includes:

[0009] When the current value of the induction coil changes suddenly, it is determined that the contactor is not sintered.

[0010] As an implementable manner, when the current value of the induction coil changes suddenly, determining that the contactor is not sintered includes:

[0011] When a sudden change occurs in the process of the current value of the induction coil rising from zero to a steady-state value, it is determined that the contactor is not sintered.

[0012] As an implementable manner, when the current value of the induction coil changes suddenly, determining that the contactor is not sintered includes:

[0013] When a sudden downward change occurs in the process of the current value of the induction coil rising from zero to a steady-state value, it is determined that the contactor is not sintered.

[0014] As an implementable manner, when the current value of the induction coil suddenly changes, the process includes:

[0015] When the current value of the induction coil increases from zero to a steady-state value, if the difference between the current average value and the current instantaneous value is greater than a set threshold, it is determined that the current value of the induction coil has a sudden change.

[0016] The instantaneous current value is the current value at the current moment, and the average current value is the average current value of all current values ​​in a period of time before the current moment.

[0017] As an implementable manner, determining that the contactor is sintered according to the change in the current value includes:

[0018] When there is no sudden change in the current value of the induction coil, it is determined that the contactor is sintered.

[0019] As an implementable manner, when the current value of the induction coil does not suddenly change, determining that the contactor is sintered includes:

[0020] When there is no sudden change in the current value of the induction coil during the process of rising from zero to a steady-state value, it is determined that the contactor is sintered.

[0021] As an implementable manner, applying voltage to both ends of the contactor includes:

[0022] A constant voltage is applied across the contactor.

[0023] As an implementable manner, obtaining the current value of the induction coil of the contactor includes:

[0024] The current value of the induction coil of the contactor is obtained, and when the current value of the induction coil reaches a steady-state value, the current value of the induction coil of the contactor is stopped from being obtained.

[0025] The second object of the present invention is to provide a contactor sintering detection device, the contactor sintering detection device comprises a power supply module, a current acquisition module and a current processing module.

[0026] The power module is used to apply voltage to both ends of the contactor;

[0027] The current acquisition module is used to obtain the current value of the induction coil of the contactor;

[0028] The current processing module is used to determine whether the contactor is sintered according to the change of the current value.

[0029] A third object of the present invention is to provide an electronic device, comprising a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program so that the electronic device executes the method described in the first aspect above.

[0030] A fourth object of the present invention is to provide a vehicle, the vehicle comprising the contactor sintering detection device described in the second aspect, or comprising the electronic device described in the third aspect.

[0031] According to the contactor sintering detection method, device and vehicle of the embodiments of the present invention, a voltage is applied to both ends of the contactor, and sintering of the contactor is determined based on the change in the current value, and the detection reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0033] Figure 1 is a flow chart of a contactor sintering detection method provided by an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of the change of the current of the induction coil over time obtained in the contactor sintering detection method provided by an embodiment of the present invention;

[0035] The solid line is the current of the induction coil of the sintering contactor;

[0036] The dotted line is the current of the induction coil of the unsintered contactor;

[0037] Figure 3 It is a structural schematic diagram of a contactor sintering detection device provided by an embodiment of the present invention;

[0038] Figure 4 It is a schematic diagram of the circuit principle of a contactor sintering detection device provided by an embodiment of the present invention;

[0039] Figure 5 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention;

[0040] Figure 6 It is a schematic structural diagram of a vehicle provided by an embodiment of the present invention.

[0041] Reference numerals:

[0042] Vehicle 500 , contactor sintering detection device 100 , contactor 110 , induction coil 111 , contactor resistor 112 , current acquisition module 101 , current processing module 102 , power module 103 , switch 104 , electronic device 200 , processor 210 , memory 220 , computer program 221 . DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] like Figure 1-6 As shown, the embodiments of the present invention provide a contactor sintering detection method, a detection device and a vehicle.

[0046] like Figure 1 As shown, the contactor sintering detection method provided by the embodiment of the present invention includes:

[0047] Applying voltage to both ends of the contactor 110;

[0048] Obtaining a current value of the induction coil 111 of the contactor 110;

[0049] The sintering of the contactor 110 is determined according to the change of the current value of the induction coil 111 .

[0050] In some embodiments, Figure 2 As shown, when the unsintered contactor 110 is closed, the magnetic flux that changes with the increase of current causes the induction coil 111 of the contactor 110 to generate electromagnetic attraction, attracting the armature of the contactor 110 to move in the direction of the induction coil 111. Figure 2 As shown, at time t1, the current in the induction coil 111 reaches the trigger current a. At this time, the electromagnetic attraction generated between the armature and the induction coil 111 begins to be greater than the elastic force provided by the reset spring in the contactor 110, and the armature begins to overcome the elastic force provided by the reset spring and move under the action of the electromagnetic force.

[0051] like Figure 2As shown, from time t1 to time t2, as the armature gets closer and closer to the induction coil 111, the air gap between the two is continuously reduced, the magnetic flux increases, and the electromagnetic resistance of the air gap changes, causing the inductance in the induction coil 111 to change and generate a reverse induced electromotive force, preventing the current of the induction coil 111 from continuing to increase. The current of the induction coil 111 suddenly changes, and at this time, the current value in the corresponding induction coil 111 changes from a to b.

[0052] like Figure 2 As shown, from time t2 to time t4, when the armature and the induction coil 111 are fitted together, the air gap between the two no longer changes, and then the current in the induction coil 111 increases approximately according to the exponential law, and finally the current value in the induction coil 111 reaches a steady-state value from b.

[0053] In some embodiments, because the current value of the induction coil 111 of the contactor 110 suddenly changes during the operation of the unsintered contactor 110, it is determined by the inherent properties of the contactor 110 and is not affected by environmental factors. Therefore, the sintering detection method of the contactor 110 in the embodiment of the present invention has higher stability and high detection reliability.

[0054] In some embodiments, the environmental factors may include, but are not limited to, special vehicle operating conditions, such as load dumping, load reverse dragging, or discharge delay.

[0055] In some embodiments, the current value of the induction coil 111 is affected by factors such as the environment and the detection equipment, and the current value of the induction coil 111 of the contactor 110 obtained may fluctuate slightly. If the slight fluctuation does not affect the overall trend of the current curve, it is not considered that the current value of the induction coil 111 has a sudden change. Only when the current value has a continuous and stable sudden change, it is considered that the contactor 110 has not been sintered.

[0056] In some embodiments, the sudden change in the current value of the induction coil 111 of the contactor 110 only occurs in a normal unsintered contactor 110. For the sintered contactor 110 with the same voltage applied, when the induction coil 111 is energized, the current in the induction coil 111 gradually increases from zero, and the induced electromotive force generated by the inductance of the induction coil 111 still causes the current value of the induction coil 111 to rise according to the law of an approximate exponential curve. However, because the fixed contacts of the induction coil 111 of the sintered contactor 110 and the movable contacts of the armature have been sintered and fixed, even if the current value of the induction coil 111 rises to the trigger current value, the armature will not move, and there will be no change in the air gap electromagnetic resistance caused by the change in the air gap. Therefore, no back electromotive force will be generated in the induction coil 111, and the current rise will still rise according to the original law. Figure 2 As shown, for the sintered contactor 110, from the beginning to the time t3, the current value of its induction coil 111 rises from zero to the steady-state value.

[0057] In some embodiments, determining that the contactor 110 is sintered according to the current value of the induction coil 111 includes:

[0058] The sintering of the contactor 110 is determined based on the time when the current value of the induction coil 111 reaches a steady-state value.

[0059] In some embodiments, determining that the contactor 110 is sintered according to the current value of the induction coil 111 includes:

[0060] When the time for the current value of the induction coil 111 to reach the steady-state value is less than a set time threshold, it is determined that the contactor 110 is sintered.

[0061] In some embodiments, the above-mentioned time threshold is set by collecting data through experiments and performing calculation and analysis on the data.

[0062] The step of determining, according to the current value of the induction coil 111, that the contactor 110 is sintered comprises:

[0063] When the time for the current value of the induction coil 111 to reach the steady-state value is greater than or equal to the set time threshold, it is determined that the contactor 110 is not sintered.

[0064] In some embodiments, determining that the contactor is sintered according to the current value of the induction coil includes:

[0065] The contactor is determined to be sintered according to the change in the current value.

[0066] In some embodiments, Figure 2 As shown, during the detection of the unsintered contactor 110, the current value of the induction coil 111 tends to change suddenly compared to the sintered contactor 110, and this phenomenon is determined by the inherent properties of the contactor 110. Therefore, it is possible to determine whether the contactor 110 has a sintering failure based on whether the current value of the induction coil 111 changes.

[0067] In some embodiments, determining that the contactor 110 is sintered according to the change in the current value includes:

[0068] When the current value of the induction coil 111 does not suddenly change, it is determined that the contactor 110 is sintered.

[0069] In some embodiments, when the current value of the induction coil 111 does not suddenly change, determining that the contactor 110 is sintered includes:

[0070] When there is no sudden change in the current value of the induction coil 111 during the process of rising from zero to a steady-state value, it is determined that the contactor 110 is sintered.

[0071] In some embodiments, determining that the contactor 110 is sintered according to the change in the current value of the induction coil 111 includes:

[0072] When the current value of the induction coil 111 changes suddenly, it is determined that the contactor 110 is not sintered.

[0073] In some embodiments, the sudden change in the current value of the induction coil 111 of the contactor 110 only occurs in a normal unsintered contactor 110. For the sintered contactor 110 to which the same voltage excitation is applied, when the induction coil 111 is energized, the current in the induction coil 111 gradually increases from zero, and the induced electromotive force generated by the inductance of the induction coil 111 still causes the current value of the induction coil 111 to rise according to the law of an approximate exponential curve, but because the fixed contact of the induction coil 111 of the sintered contactor 110 and the movable contact of the armature have been sintered and fixed, even if the current value of the induction coil 111 rises to the trigger current value, the armature will not move, and there will be no change in the electromagnetic resistance of the air gap caused by the change in the air gap, so no back electromotive force will be generated in the induction coil 111, and the current rise will still rise according to the original exponential law.

[0074] In some embodiments, when the current value of the induction coil 111 changes suddenly, determining that the contactor 110 is not sintered includes:

[0075] When a sudden change occurs in the process of the current value of the induction coil 111 rising from zero to a steady-state value, it is determined that the contactor 110 is not sintered.

[0076] In some embodiments, when the current value of the induction coil 111 changes suddenly, determining that the contactor 110 is not sintered includes:

[0077] When a sudden downward change occurs in the process of the current value of the induction coil 111 rising from zero to a steady-state value, it is determined that the contactor 110 is not sintered.

[0078] In some embodiments, a sudden downward change occurs in the process of the current value of the induction coil 111 rising from zero to a steady-state value. The sudden downward change specifically means that in the process of the current value of the induction coil 111 rising from zero to a steady-state value, there is a continuous and stable current value, showing a trend of gradually decreasing current value. When the current value decreases to a certain value, it shows a trend of gradually increasing again until it reaches a steady-state value.

[0079] In some embodiments, when the current value of the induction coil 111 suddenly changes, the process includes:

[0080] When the current value of the induction coil 111 increases from zero to a steady-state value, when the difference between the current average value and the current instantaneous value is greater than a set current threshold, it is determined that the current value of the induction coil has a sudden change, wherein the current instantaneous value is the current value at the current moment, and the current average value is the average value of all current values ​​in a period of time before the current moment.

[0081] In some embodiments, the current threshold can be set by collecting data through experiments and performing calculations and analyses on the data.

[0082] In some embodiments, Figure 2 As shown, the current of the sintering contactor 110 rises to a steady-state value at time t3. However, in the process of the current value of the induction coil 111 rising from zero to the steady-state value, the current value of the induction coil 111 has not changed suddenly, so it is determined that the contactor 110 has a sintering fault.

[0083] In some embodiments, applying a voltage to both ends of the contactor 110 includes: applying a constant voltage to both ends of the contactor 110 .

[0084] In some embodiments, the constant voltage applied to both ends of the contactor 110 needs to be no less than the lowest voltage value of the contactor 110 armature closure, because inside the contactor 110, the armature is usually connected to the reset spring. When the induction coil 111 is not energized, because there is no current inside the induction coil 111, the induction coil 111 does not generate electromagnetic attraction. At this time, the armature is away from the induction coil 111 under the action of the reset spring force, and the armature is in the initial position. If the induction coil 111 is to attract the armature, it needs to overcome the reset spring force. At this time, the voltage loaded on both ends of the contactor 110 is the minimum voltage value of the armature closure.

[0085] In some embodiments, the type of the return spring disposed inside the contactor 110 may include, but is not limited to, a compression spring and a tension spring.

[0086] In some embodiments, obtaining the current value of the induction coil 111 of the contactor 110 includes: obtaining the current value of the induction coil 111 of the contactor 110, and when the current value of the induction coil 111 reaches a steady-state value, stopping obtaining the current value of the induction coil 111 of the contactor 110.

[0087] In some embodiments, Figure 2As shown, because the normal unsintered contactor 110 pull-in process generates a back electromotive force in the induction coil 111, which causes the current to suddenly change downward, the time t4 when the current value of the unsintered contactor 110 rises from zero to the steady-state value is delayed compared to the time t3 of the sintered contactor 110. Therefore, it is also possible to determine whether the contactor 110 is sintered based on the time when the current value of the induction coil 111 rises to the steady-state value.

[0088] In some embodiments, because the time for the current value of the induction coil 111 of the contactor 110 to reach a steady-state value during the operation of the above-mentioned unsintered contactor 110 is determined by the inherent properties of the contactor 110 and is not affected by environmental factors, the contactor sintering detection method of the embodiment of the present invention has higher stability and high detection reliability.

[0089] In some embodiments, the environmental factors may include, but are not limited to, special vehicle operating conditions, such as load dumping, load reverse dragging, or discharge delay.

[0090] Second, as Figure 3 As shown, the present invention provides a contactor sintering detection device 100, which includes a power supply module 103, a current acquisition module 101 and a current processing module 102.

[0091] The power module is used to apply voltage to both ends of the contactor 110;

[0092] The current acquisition module 101 is used to obtain the current value of the induction coil 111 of the contactor 110;

[0093] The current processing module 102 is used to determine whether the contactor 110 is sintered according to the current value.

[0094] In some embodiments, Figure 4 As shown, it is a schematic diagram of the circuit principle of the contactor sintering detection device 100, including a power module 103, a switch 104, a current acquisition module 101 and a current processing module 102. After the switch 104 is closed, the power module 103 is used to provide a voltage source for the circuit. At this time, the current in the circuit flows through the induction coil 111, and an electromagnetic attraction is generated inside the induction coil 111 to attract the armature to move. The current acquisition module 101 is used to obtain the current value flowing through the induction coil 111, and the current processing module 102 processes the current value obtained by the current acquisition module 101. When the current processing module 102 recognizes that the current value collected by the current acquisition module 101 has a downward mutation, it is determined that the contactor 110 is not sintered. The contactor 110 in the figure is simplified to consist of a contactor resistor 112 and an induction coil 111.

[0095] In some embodiments, the switch 104 may be a device with on-off functions such as a relay.

[0096] In some embodiments, the contactor sintering detection device 100 may further include more types and quantities of components, which is not specifically limited in the present invention.

[0097] In some embodiments, the current acquisition module 101 and the current processing module 102 may also perform more steps, which is not specifically limited in the present invention.

[0098] The contactor sintering detection device 100 of the embodiment of the present invention applies voltage to both ends of the contactor 110. When the current value of the induction coil 111 suddenly changes, it is determined that the contactor 110 is not sintered, and the detection reliability is high.

[0099] Thirdly, Figure 5 As shown, the present invention provides an electronic device 200, which includes a processor 210 and a memory 220, wherein the memory 220 stores a computer program, and the processor 210 executes the computer program so that the electronic device 200 executes the method described in the first aspect above.

[0100] In some embodiments, the processor 210 may be composed of at least one general-purpose processor, such as a central processing unit (CPU), or a combination of a CPU and a hardware chip. The processor 210 is used to execute various types of digital storage instructions. The processor 210 can implement Figure 1 or Figure 2 Any step in the diagram shown.

[0101] In some embodiments, the memory 220 may be a volatile memory, such as a random access memory, a dynamic random access memory, a static random access memory, a synchronous dynamic random access memory, etc. The memory 220 may also include a combination of the above types. The memory 220 may include programs and data. The memory 220 may also store power supply voltage, voltage across the contactor 110, contactor resistance 112, and at least one current value of the induction coil 111 obtained, etc., which is not specifically limited in this application.

[0102] Fourthly, Figure 6 As shown, the present invention provides a vehicle 500, which is used to execute the method described in the first aspect, including the contactor sintering detection device 100 described in the second aspect, or includes the electronic device 200 described in the third aspect.

[0103] The vehicle 500 of the embodiment of the present invention applies voltage to both ends of the contactor 110 and determines whether the contactor is sintered according to the change of the current value of the induction coil, so the detection reliability is high.

[0104] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0105] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. A contactor sintering detection method, characterized in that: The contactor sintering detection method comprises: applying a voltage to both ends of the contactor; Obtaining a current value of the induction coil of the contactor; The sintering of the contactor is determined according to a change in the current value of the induction coil.

2. The contactor sintering detection method according to claim 1, characterized in that: The step of determining that the contactor is sintered according to a change in the current value of the induction coil comprises: When the current value of the induction coil changes suddenly, it is determined that the contactor is not sintered.

3. The contactor sintering detection method according to claim 2, characterized in that: When the current value of the induction coil changes suddenly, determining that the contactor is not sintered includes: When a sudden change occurs in the process of the current value of the induction coil rising from zero to a steady-state value, it is determined that the contactor is not sintered.

4. The contactor sintering detection method according to claim 2, characterized in that: When the current value of the induction coil changes suddenly, determining that the contactor is not sintered includes: When a sudden downward change occurs in the process of the current value of the induction coil rising from zero to a steady-state value, it is determined that the contactor is not sintered.

5. The contactor sintering detection method according to claim 2, characterized in that: When the current value of the induction coil suddenly changes, it includes: When the current value of the induction coil increases from zero to a steady-state value, if the difference between the current average value and the current instantaneous value is greater than a set threshold, it is determined that the current value of the induction coil has a sudden change. The instantaneous current value is the current value at the current moment, and the average current value is the average current value of all current values ​​in a period of time before the current moment.

6. The contactor sintering detection method according to claim 1, characterized in that: Determining that the contactor is sintered according to the change in the current value includes: When there is no sudden change in the current value of the induction coil, it is determined that the contactor is sintered.

7. The contactor sintering detection method according to claim 6, characterized in that: When the current value of the induction coil does not suddenly change, determining that the contactor is sintered includes: When there is no sudden change in the current value of the induction coil during the process of rising from zero to a steady-state value, it is determined that the contactor is sintered.

8. The contactor sintering detection method according to claim 1, characterized in that: The applying voltage to both ends of the contactor comprises: A constant voltage is applied across the contactor.

9. The contactor sintering detection method according to claim 1, characterized in that: The obtaining of the current value of the induction coil of the contactor comprises: The current value of the induction coil of the contactor is obtained, and when the current value of the induction coil reaches a steady-state value, the current value of the induction coil of the contactor is stopped from being obtained.

10. A contactor sintering detection device, characterized in that: The contactor sintering detection device comprises a power supply module, a current acquisition module and a current processing module. The power module is used to apply voltage to both ends of the contactor; The current acquisition module is used to obtain the current value of the induction coil of the contactor; The current processing module is used to determine whether the contactor is sintered according to the change of the current value.

11. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program so that the electronic device performs the method according to any one of claims 1 to 9.

12. A vehicle, characterized in that: The vehicle includes the contactor sintering detection device according to claim 10, or the electronic device according to claim 11.

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