Electric drive system and method of vehicle and vehicle

Abstract

The invention relates to the technical field of vehicles, and discloses an electric drive system and method of a vehicle and the vehicle, and the method comprises the steps: obtaining the current three-phase current of a drive motor, and determining the current detection state of each phase current based on the current three-phase current; if the two-phase current is in the abnormal detection state, determining a strategy through the phase current in the normal detection state and a preset phase current, and determining the other two-phase current to obtain a reconstructed three-phase current; and realizing control of the electric drive system based on the reconstructed three-phase current. Therefore, by detecting the normal phase current and presetting the phase current to determine the strategy, the other two-phase current can be determined to obtain the reconstructed three-phase current, so that the electric drive system is controlled, the problem of vehicle power loss caused by abnormal current detection can be relieved, and accidents are reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an electric drive system and method for a vehicle, and a vehicle. Background Art

[0002] New energy vehicles are becoming increasingly common in daily life and are gaining widespread popularity due to their superior performance. Most new energy vehicles are powered by electric drive systems. Each of the three-phase currents in the electric drive motor is collected in real time using a current sensor. The controller uses this data for real-time control.

[0003] In some application scenarios, when one or more sensors fail, the current cannot be detected or the detection results are inaccurate. The entire vehicle will report a fault and cause power loss, which can easily lead to traffic accidents and other incidents under certain working conditions. Summary of the Invention

[0004] In view of the above problems, the present application provides a vehicle electric drive system and method thereof, and a vehicle. By detecting the normal phase current and the preset phase current determination strategy, the remaining two-phase current can be determined to obtain the reconstructed three-phase current, thereby realizing the control of the electric drive system, which can alleviate the problem of vehicle power loss caused by abnormal current detection and reduce the occurrence of accidents.

[0005] The first aspect of the present application provides a method for controlling an electric drive system of a vehicle, comprising: obtaining the current three-phase current of the drive motor, and determining the current detection state of each phase current based on the current three-phase current; if two phase currents are in an abnormal detection state, determining the remaining two phase currents through the phase currents in a normal detection state and a preset phase current determination strategy to obtain a reconstructed three-phase current; and realizing control of the electric drive system based on the reconstructed three-phase current.

[0006] In some specific embodiments, the steps of determining the remaining two phase currents to reconstruct the three-phase current through the phase current in the normal detection state and the preset phase current determination strategy include: obtaining the current working state of the vehicle; if the vehicle is in a first preset working state, determining the current adjustment value corresponding to the first preset working state; and adjusting the current value of the phase current in the normal detection state according to the current adjustment value to serve as the current value of the remaining two phase currents.

[0007] In some specific embodiments, after the step of obtaining the current working state of the vehicle, the method further includes: if the vehicle is in a second preset working state, using the current value of the phase current in the normal detection state as the current values of the remaining two phase currents.

[0008] In some specific embodiments, the first preset working state includes a preset vibration working state; if the vehicle is in the first preset working state, the step of determining the current adjustment value corresponding to the first preset working state includes: if the vehicle is in the preset vibration working state, determining the current vibration level of the vehicle; determining the current adjustment value corresponding to the preset vibration working state based on the current vibration level; wherein different vibration levels correspond to different current adjustment values.

[0009] In some specific embodiments, if the vehicle is in a preset vibration working state, the step of determining the current vibration level of the vehicle includes: obtaining the historical three-phase current of the drive motor and the corresponding historical vibration level when the vehicle is in a preset vibration working condition within a preset historical period; determining the time ratio when the difference between any two phase currents in the historical three-phase current is greater than the preset difference based on the historical three-phase current; if the time ratio is greater than the preset ratio, determining the correspondence between the vibration level and the current adjustment value based on the difference and the historical vibration level.

[0010] In some specific embodiments, the first preset operating state includes a preset high-speed cruise operating state; if the vehicle is in the first preset operating state, the step of determining the current adjustment value corresponding to the first preset operating state includes: if the vehicle is in the preset high-speed cruise operating state, determining the current speed of the vehicle and the current amplitude of the drive motor; determining the current adjustment value corresponding to the preset high-speed cruise operating state based on the current speed and current amplitude; wherein, different combinations of vehicle speeds and current amplitudes correspond to different current adjustment values.

[0011] In some specific embodiments, after obtaining the current three-phase current of the drive motor and determining the current detection status of each phase current based on the current three-phase current, the following steps are included: if one phase current is in an abnormal detection state, obtaining the current working state of the vehicle; if the vehicle is in a preset working state, determining the phase current in the abnormal detection state based on the remaining two phase currents to obtain a reconstructed three-phase current.

[0012] In some specific embodiments, the steps of controlling the electric drive system based on the reconstructed three-phase current include: controlling the electric drive system to operate in a preset working mode based on the reconstructed three-phase current; wherein, the preset working mode corresponds to a current power of the drive motor being less than a preset power, and a current torque being less than a preset torque; if the time for which the electric drive system operates in the preset working mode exceeds a preset time, the electric drive system is controlled to stop working.

[0013] A second aspect of the present application provides an electric drive system for a vehicle, comprising: a controller; and a memory for storing a computer program, which, when executed by the controller, implements any of the above-mentioned methods for controlling the electric drive system of a vehicle.

[0014] A third aspect of the present application provides a vehicle comprising the above-mentioned electric drive system for the vehicle.

[0015] The present application has at least the following beneficial technical effects: based on the electric drive system and method of the vehicle provided by the present application, and the vehicle, the method includes: obtaining the current three-phase current of the drive motor, and determining the current detection state of each phase current based on the current three-phase current; if there are two phase currents in an abnormal detection state, then the remaining two phase currents are determined by the phase currents in the normal detection state and the preset phase current determination strategy to obtain a reconstructed three-phase current; and the electric drive system is controlled based on the reconstructed three-phase current. Therefore, by detecting the normal phase current and the preset phase current determination strategy, the remaining two phase currents can be determined to obtain the reconstructed three-phase current, thereby achieving control of the electric drive system, which can alleviate the problem of vehicle power loss caused by abnormal current detection and reduce the occurrence of accidents.

[0016] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the drawings. In the drawings:

[0018] Figure 1 This is a flow chart of an embodiment of a method for controlling an electric drive system of a vehicle provided by the present application;

[0019] Figure 2 is a flow chart of another embodiment of a method for controlling an electric drive system of a vehicle provided by the present application;

[0020] Figure 3 This is a flow chart of another embodiment of the vehicle electric drive system control method provided by the present application;

[0021] Figure 4 This is a flow chart of another embodiment of the vehicle electric drive system control method provided by the present application;

[0022] Figure 5 This is a flow chart of another embodiment of the vehicle electric drive system control method provided by the present application;

[0023] Figure 6 This is a flow chart of another embodiment of the vehicle electric drive system control method provided by the present application;

[0024] Figure 7This is a flow chart of another embodiment of the vehicle electric drive system control method provided in the present application. DETAILED DESCRIPTION

[0025] The following describes exemplary embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings show exemplary embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present application without inventive effort are within the scope of protection of this application.

[0026] If there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0027] The first aspect of the present application provides a method for controlling an electric drive system of a vehicle, which is applied to an electric drive system of a new energy vehicle. Figure 1 This is a flow chart of an embodiment of the vehicle electric drive system control method provided by this application. Figure 1 , the method comprises the following steps:

[0028] S101: Acquire the current three-phase current of the drive motor, and determine the current detection state of each phase current based on the current three-phase current.

[0029] It should be understood that when the drive motor of the electric drive system is working, its working current is a three-phase current, which is composed of three AC sinusoidal currents with the same frequency, generally equal amplitude (peak value or effective value), but with phases that differ by 120 degrees (electrical angle).

[0030] Among them, a current sensor is provided in the electric drive system, which can be specifically a Hall sensor, and a current sensor is provided corresponding to each phase current, and then the three-phase current is detected respectively by the current sensor to obtain the current three-phase current of the drive motor.

[0031] After obtaining the current three-phase current of the drive motor, the currents of the three phases, i.e., the three-phase currents, will be obtained respectively. At this time, the current detection status of each phase current can be determined by the preset judgment strategy. Among them, the current detection status can include a normal detection state and an abnormal detection state. The preset judgment strategy can be a strategy for judging whether the current detection is normal. It can be set or adopted according to actual needs. The relevant strategy in the existing technology. In some application scenarios, if a phase current is not detected or a phase current differs greatly from the other phase current values, it can be considered that the phase current detection is abnormal, but it is not limited to this.

[0032] S102: If there are two phase currents in abnormal detection states, the remaining two phase currents are determined by using the phase currents in normal detection states and a preset phase current determination strategy to obtain a reconstructed three-phase current.

[0033] If two phase currents are in an abnormal detection state, it means that these two phase currents were not detected or the detection results are inaccurate. However, the remaining phase current is in a normal detection state, that is, the detection of this phase current is accurate. In this case, the remaining two phase currents are determined by using the phase current in the normal detection state and the preset phase current determination strategy. Together with the phase current in the normal detection state, the reconstructed three-phase current is formed.

[0034] It should be understood that under the preset phase current determination strategy, the input is the phase current in the normal detection state, and the output is the current of the remaining two phases. This embodiment does not limit the preset phase current determination strategy, but mainly emphasizes the specific idea of determining the currents of the remaining two phases from the current of one phase.

[0035] S103: Control the electric drive system based on the reconstructed three-phase current.

[0036] After obtaining the reconstructed three-phase current, the electric drive system is further controlled based on the reconstructed three-phase current, thereby enabling the electric drive system to operate stably.

[0037] In some applications, reconstructing three-phase currents enables precise torque control. For example, modern high-performance motor control systems (such as FOC (Field Oriented Control) and DTC (Direct Torque Control) rely on three-phase currents. Furthermore, overcurrent protection is possible. For example, real-time monitoring of each phase's current is key to preventing motor windings and power switches from burning out due to faults such as overload and short circuit. When any phase current is detected to exceed a set safety threshold, the controller can immediately take protective measures, such as shutting down the inverter (blocking PWM), entering power-limiting mode (limp home mode), or completely shutting down the machine, protecting expensive powertrain components.

[0038] In summary, based on the vehicle electric drive system control method provided by the above embodiment, by detecting the normal phase current and the preset phase current determination strategy, the remaining two-phase current can be determined to obtain the reconstructed three-phase current, thereby realizing the control of the electric drive system, which can alleviate the problem of vehicle power loss caused by abnormal current detection and reduce the occurrence of accidents.

[0039] Figure 2 It is a flow chart of another embodiment of the vehicle electric drive system control method provided in the present application.

[0040] Combine Figure 2 In some specific embodiments, the step of determining the remaining two phase currents to obtain the reconstructed three-phase current by using the phase current in the normal detection state and the preset phase current determination strategy includes, that is, the above-mentioned step S102 includes:

[0041] S201: Obtain the current working status of the vehicle.

[0042] The working status of the vehicle at the current moment, that is, the current working status of the vehicle, can reflect specific information such as the working status of relevant components of the vehicle at the current moment, the working conditions formed by the environment in which the vehicle is located, etc.

[0043] It should be understood that the current working state of the vehicle will affect the three-phase current of the drive motor to a certain extent. For example, it will affect the current size between each phase current of the three-phase current to a certain extent, resulting in large differences in the current values between each phase current.

[0044] S202: If the vehicle is in a first preset operating state, determine a current adjustment value corresponding to the first preset operating state.

[0045] Among them, the first preset working state is pre-set according to the impact of the working state on the three-phase current. When the vehicle is in the first preset working state, the current values between the phases of the three-phase current of the drive motor are quite different, which is different from the state in which the current values of the phases are basically the same under normal circumstances.

[0046] It should be understood that there may be multiple first preset operating states, and different first preset operating states may correspond to different current adjustment values, thereby establishing a correspondence between the first preset operating state and the current adjustment value. After obtaining the first preset operating state, the corresponding current adjustment value can be directly obtained based on the first preset operating state and the correspondence.

[0047] S203: performing an adjustment operation on the current value of the phase current in the normal detection state according to the current adjustment value to serve as the current values of the remaining two phase currents.

[0048] After obtaining the current adjustment value, the current value of the phase current in the normal detection state is further adjusted according to the current adjustment value to serve as the current values of the remaining two phase currents. The adjustment operation of the current value of the phase current in the normal detection state according to the current adjustment value is to adjust the current value of the phase current in the normal detection state using the current adjustment value, and to obtain a calculation result of the current value as the current value of the remaining two phase currents, rather than to adjust the current of the phase current in the normal detection state of the drive motor.

[0049] It should be understood that the current adjustment operation performed on the phase current in the normal detection state according to the current adjustment value can be performed by adding the current adjustment value to the phase current in the normal detection state to obtain the calculated value. Furthermore, the current adjustment value can be positive or negative, thereby increasing or decreasing the obtained phase current value. Furthermore, there can be two current adjustment values, one corresponding to each of the two phase currents, and in this case, the two current adjustment values can be both positive, both negative, or one positive and one negative.

[0050] In some specific embodiments, after the step of obtaining the current working state of the vehicle, that is, after the above-mentioned step S201, it also includes: if the vehicle is in a second preset working state, the current value of the phase current in the normal detection state is used as the current value of the remaining two phase currents.

[0051] Specifically, the second preset operating state is also pre-set based on the operating state's impact on the three-phase current. When the vehicle is in the second preset operating state, the current values of the three-phase currents of the drive motor are similar, meaning the second preset operating state effectively has little impact on the three-phase current values. Therefore, when the vehicle is in the second preset operating state, the current values of the remaining two phases are similar to those in the normal detection state. Therefore, the current values of the phase currents in the normal detection state are used as the current values of the remaining two phases, which aligns with actual application scenarios.

[0052] Figure 3 This is a flow chart of another embodiment of the vehicle electric drive system control method provided in the present application.

[0053] In some specific embodiments, the first preset operating state includes a preset vibration operating state, wherein a parameter value of the preset vibration operating state is pre-set. After the parameter value of the vehicle reaches the preset parameter value, the vehicle can be considered to be in the preset vibration operating state. When the vehicle is in the preset vibration operating state, the vibration level of the vehicle can be greater than a certain level, and the vibration level can be evaluated using relevant evaluation criteria in the prior art. When certain vehicles are in the preset vibration operating state, the current magnitudes of the three-phase currents can be affected to a certain extent, resulting in significant differences in the current values of the phases.

[0054] Combine Figure 3 If the vehicle is in the first preset operating state, the step of determining the current adjustment value corresponding to the first preset operating state, i.e., the above-mentioned step S202, includes:

[0055] S301: If the vehicle is in a preset vibration working state, determine the current vibration level of the vehicle.

[0056] In conjunction with the above, when the vehicle is in a preset vibration operating state, the vibration level of the vehicle is greater than a certain level, but the specific vibration level of the vehicle can vary greatly. In this case, the current vibration level of the vehicle can be further determined. Specifically, multiple different preset vibration levels can be pre-set, and after obtaining the current vibration parameters, the corresponding preset vibration level is obtained based on the current vibration parameters as the current vibration level.

[0057] S302: Determine a current adjustment value corresponding to a preset vibration working state according to the current vibration level; wherein different vibration levels correspond to different current adjustment values.

[0058] It should be understood that when certain vehicles are in a preset vibration operating state, different vibration levels may have different effects on the current magnitudes between the three-phase currents. The corresponding relationship between the vibration level and the current adjustment value can be set based on the effect of different vibration levels on the current magnitudes between the three-phase currents. For example, if a higher vibration level has a greater effect on the current magnitudes between the three-phase currents, a higher current adjustment value can be set.

[0059] Figure 4 This is a flow chart of another embodiment of the vehicle electric drive system control method provided in the present application.

[0060] Combine Figure 4 In some specific embodiments, if the vehicle is in a preset vibration operating state, before the step of determining the current vibration level of the vehicle, that is, before the above-mentioned step S301, the following steps are included:

[0061] S401: Obtain historical three-phase currents of a drive motor and corresponding historical vibration levels when the vehicle is in a preset vibration operating condition within a preset historical period.

[0062] The duration of the preset historical period can be one day, one week, one month, etc., without specific restrictions. The end time of the preset historical period can be the current time. The historical three-phase current corresponding to the vehicle's preset vibration operating condition during the preset historical period reflects the specific conditions of the three-phase current values. The vibration level corresponding to the three-phase current at this time is the corresponding historical vibration level.

[0063] S402: Determine, based on the historical three-phase currents, a time ratio during which a difference between any two phase currents in the historical three-phase currents is greater than a preset difference.

[0064] It should be understood that when the difference between any two phases in the historical three-phase currents is greater than the preset difference, it indicates that at least one of the three phases may be abnormal. In this case, the proportion of the time period during which the difference between any two phases in the historical three-phase currents is greater than the preset difference can reflect the proportion of the time period during which the phase current was abnormal to the time period during which the system was in the preset vibration condition.

[0065] S403: If the duration ratio is greater than the preset ratio, a corresponding relationship between the vibration level and the current adjustment value is determined according to the difference and the historical vibration level.

[0066] Among them, the preset ratio is set according to the vehicle properties, vibration level and other relevant factors, and the preset ratio can be a relatively large ratio. When the ratio of the duration that the difference between any two phase currents in the historical three-phase current is greater than the preset difference is greater than the preset ratio, it means that the phase current anomaly of the vehicle under the vibration condition is more serious. At this point, it can be considered that in the subsequent time period, if the vehicle is in the preset vibration condition, the duration that the difference between any two phase currents in the three-phase current is greater than the preset difference will still be relatively long, that is, the phase current anomaly of the vehicle under the vibration condition will still be more serious.

[0067] The difference is the difference in phase current, that is, the current difference between specific phase currents. At this time, there will be a corresponding relationship between the phase current difference and the historical vibration level. In some application scenarios, if there are multiple current differences, then multiple current differences correspond to a historical vibration level at the same time. At this time, the current difference can be used as a current adjustment value, and the current adjustment value belongs to a specific phase. For example, there is a current difference between the first phase and the second phase, then the current difference can be used as a current adjustment value, and the current adjustment value belongs to the vibration level between the first phase and the second phase and corresponds to the historical vibration level. In the subsequent process, if the vehicle is at this vibration level, then the corresponding current adjustment value can be determined based on the corresponding relationship. The current adjustment value belongs to the first phase and the second phase, that is, the current of the second phase can only be obtained through the current adjustment value on the basis of the first phase, or the current of the first phase can be obtained through the current adjustment value on the basis of the second phase.

[0068] Figure 5 This is a flow chart of another embodiment of the vehicle electric drive system control method provided in the present application.

[0069] Combine Figure 5 In some specific embodiments, the first preset working state includes a preset high-speed cruising working state. When the vehicle is in the preset high-speed cruising state, it can be a state of cruising at a speed greater than a preset speed. At this time, the current of the vehicle's drive motor is relatively large.

[0070] If the vehicle is in the first preset operating state, the step of determining the current adjustment value corresponding to the first preset operating state, i.e., step S202, includes:

[0071] S501: If the vehicle is in a preset high-speed cruise operating state, the current speed of the vehicle and the current amplitude of the drive motor are determined.

[0072] When the vehicle is in the preset high-speed cruise mode, the current drawn by the drive motor is generally high, and the three-phase currents of the drive motor are prone to large differences. Furthermore, the current speed of the vehicle and the amplitude of the drive motor current generally affect the magnitude of the differences in the three-phase currents.

[0073] S502: Determine a current adjustment value corresponding to a preset high-speed cruise operating state according to the current vehicle speed and the current amplitude; wherein different combinations of vehicle speeds and current amplitudes correspond to different current adjustment values.

[0074] Among them, the corresponding relationship between the combination of different vehicle speeds and current amplitudes and different current adjustment values can be obtained through the vehicle's historical working data, so that the corresponding relationship meets the actual needs, and the determined current adjustment value meets the actual needs.

[0075] Figure 6 This is a flow chart of another embodiment of the vehicle electric drive system control method provided in the present application.

[0076] Combine Figure 6 In some specific embodiments, after the step of obtaining the current three-phase current of the drive motor and determining the current detection state of each phase current based on the current three-phase current, that is, after the above-mentioned step S101, the following steps are included:

[0077] S601: If one phase current is in an abnormal detection state, obtain the current working state of the vehicle.

[0078] It should be understood that even if only one phase current is in the abnormality detection state, during the reconstruction process of the phase current, the current operating state of the vehicle may also affect the determination of the phase current.

[0079] S602: If the vehicle is in a preset working state, the phase current in the abnormal detection state is determined according to the remaining two-phase currents to obtain a reconstructed three-phase current.

[0080] It should be understood that the preset operating state may affect the vehicle's phase current within a preset range of influence. In this case, the relationship between the three-phase currents conforms to a conventional theoretical relationship, which may be a correlation relationship known in the prior art. In this case, the phase current in the abnormal detection state can be determined based on the remaining two-phase currents and the conventional relationship. If the vehicle is outside the preset operating state, the relationship between the three-phase currents may fluctuate significantly, making it unsuitable to determine the phase current in the abnormal detection state based on the remaining two-phase currents.

[0081] Figure 7 This is a flow chart of another embodiment of the vehicle electric drive system control method provided in the present application.

[0082] Combine Figure 7 In some specific embodiments, the step of controlling the electric drive system based on the reconstructed three-phase current, i.e., the above-mentioned step S103, includes:

[0083] S701: Controlling the electric drive system to operate in a preset working mode based on the reconstructed three-phase current; wherein the preset working mode corresponds to a current power of the drive motor being less than a preset power, and a current torque being less than a preset torque.

[0084] It should be understood that since two phase currents have detection anomalies, although a reconstructed circuit is obtained, there may be some discrepancy between the reconstructed circuit and the actual current. Alternatively, the two-phase current detection anomaly may not be solely due to the sensor, but may also be due to problems with the phase current itself.

[0085] Therefore, in this case, even if the electric drive system is controlled based on the reconstructed phase current, it still needs to be controlled to operate in the preset operating mode. Because the preset operating mode corresponds to the current power of the drive motor being less than the preset power and the current torque being less than the preset torque, the safety of the electric drive system can be guaranteed to a certain extent.

[0086] S702: If the electric drive system operates in the preset operating mode for a period exceeding a preset period, the electric drive system is controlled to stop operating.

[0087] Even if the electric drive system operates in the preset operating mode based on the reconstructed three-phase current control, there are still certain risks in the electric drive system. Therefore, if the electric drive system operates in the preset operating mode for a period exceeding the preset time, the electric drive system can be controlled to stop operating to further ensure safety.

[0088] A second aspect of the present application provides an electric drive system for a vehicle, comprising: a controller; and a memory for storing a computer program, which, when executed by the controller, implements the vehicle electric drive system control method in any of the above embodiments.

[0089] A third aspect of the present application provides a vehicle, comprising the electric drive system of the vehicle in the above embodiment.

[0090] In summary, based on the electric drive system and method of the vehicle provided by this application, and the vehicle, the method includes: obtaining the current three-phase current of the drive motor, and determining the current detection state of each phase current based on the current three-phase current; if there are two phase currents in an abnormal detection state, then the remaining two phase currents are determined by the phase currents in the normal detection state and the preset phase current determination strategy to obtain a reconstructed three-phase current; and the electric drive system is controlled based on the reconstructed three-phase current. Therefore, by detecting the normal phase current and the preset phase current determination strategy, the remaining two phase currents can be determined to obtain the reconstructed three-phase current, thereby achieving control of the electric drive system, which can alleviate the problem of vehicle power loss caused by abnormal current detection and reduce the occurrence of accidents.

[0091] The above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. Ordinary technicians in this field can easily make corresponding changes or modifications based on the main ideas and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

Claims

1. A method for controlling an electric drive system of a vehicle, characterized in that: include: Acquire the current three-phase current of the drive motor, and determine the current detection state of each phase current based on the current three-phase current; If two phase currents are in abnormal detection state, the remaining two phase currents are determined by using the phase currents in normal detection state and the preset phase current determination strategy to obtain the reconstructed three-phase current; The electric drive system is controlled based on the reconstructed three-phase current.

2. The electric drive system control method according to claim 1, characterized in that: The steps of determining the remaining two phase currents to obtain the reconstructed three-phase currents by using the phase current in the normal detection state and a preset phase current determination strategy include: Get the current working status of the vehicle; If the vehicle is in a first preset operating state, determining a current adjustment value corresponding to the first preset operating state; The current value of the phase current in the normal detection state is adjusted according to the current adjustment value to serve as the current values of the remaining two phase currents.

3. The electric drive system control method according to claim 2, characterized in that: After the step of obtaining the current working status of the vehicle, the following steps are also included: If the vehicle is in the second preset working state, the current value of the phase current in the normal detection state is used as the current values of the remaining two phase currents.

4. The electric drive system control method according to claim 2, characterized in that: The first preset working state includes a preset vibration working state; If the vehicle is in a first preset operating state, the step of determining a current adjustment value corresponding to the first preset operating state includes: If the vehicle is in the preset vibration operating state, determining the current vibration level of the vehicle; A current adjustment value corresponding to the preset vibration working state is determined according to the current vibration degree; wherein different vibration degrees correspond to different current adjustment values.

5. The electric drive system control method according to claim 4, characterized in that: If the vehicle is in the preset vibration operating state, before the step of determining the current vibration level of the vehicle, the method includes: Obtain the historical three-phase current of the drive motor and the corresponding historical vibration level when the vehicle is in a preset vibration working condition within a preset historical period; Determining, based on the historical three-phase currents, a time ratio during which a difference between any two phase currents in the historical three-phase currents is greater than a preset difference; If the duration ratio is greater than a preset ratio, a corresponding relationship between the vibration degree and the current adjustment value is determined according to the difference and the historical vibration degree.

6. The electric drive system control method according to claim 2, characterized in that: The first preset working state includes a preset high-speed cruise working state; If the vehicle is in a first preset operating state, the step of determining a current adjustment value corresponding to the first preset operating state includes: If the vehicle is in the preset high-speed cruise operating state, determining the current speed of the vehicle and the current amplitude of the drive motor; A current adjustment value corresponding to the preset high-speed cruise operating state is determined according to the current vehicle speed and the current amplitude; wherein different combinations of vehicle speeds and current amplitudes correspond to different current adjustment values.

7. The electric drive system control method according to claim 1, characterized in that: After the steps of obtaining the current three-phase current of the drive motor and determining the current detection state of each phase current based on the current three-phase current, the method includes: If one phase current is in an abnormal detection state, obtaining the current working state of the vehicle; If the vehicle is in a preset working state, the phase current in the abnormal detection state is determined according to the remaining two-phase currents to obtain the reconstructed three-phase current.

8. The electric drive system control method according to claim 1, characterized in that: The step of controlling the electric drive system based on the reconstructed three-phase current includes: Based on the reconstructed three-phase current, the electric drive system is controlled to operate in a preset operating mode; wherein the preset operating mode corresponds to a current power of the drive motor being less than a preset power and a current torque being less than a preset torque; If the electric drive system operates in the preset operating mode for a period exceeding a preset period, the electric drive system is controlled to stop operating.

9. An electric drive system for a vehicle, characterized in that: include: Controller; A memory for storing a computer program, wherein when the computer program is executed by the controller, the method for controlling the electric drive system of a vehicle according to any one of claims 1 to 8 is implemented.

10. A vehicle, characterized in that: An electric drive system for a vehicle comprising the vehicle as claimed in claim 9.

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