Method for handling belt slip in a micro-hybrid system and vehicle

Abstract

The application provides a micro-mixing system transmission belt slip processing method and a car, the micro-mixing system transmission belt slip processing method comprises the following steps: setting corresponding threshold values according to current working conditions, the threshold values include judgment threshold values, time length threshold values and number threshold values; obtaining the speed difference between the motor speed and the speed ratio conversion speed of the engine; monitoring the relationship between the speed difference and the judgment threshold value corresponding to the current working condition, recording a slip event when the duration of the speed difference not less than the judgment threshold value reaches the time length threshold value corresponding to the corresponding working condition; counting the number of slip events corresponding to the current working condition, and triggering the post-processing measure step corresponding to the current working condition when the number of slip events reaches the number threshold value. In this way, the corresponding threshold values are set according to different standards under different working conditions, the slip fault can be identified and the slip severity can be judged, and then different post-processing measures are triggered, so that false positives or false negatives are not easy to occur.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automotive technology, in particular to a slip processing method for a transmission belt of a micro hybrid system and an automobile. BACKGROUND

[0002] With the increasingly stringent fuel consumption regulations for passenger cars, hybrid cars are increasingly favored by automobile manufacturers and consumers. Among them, the P0-48V micro hybrid architecture is the most minimal modification and the lowest cost hybrid solution on the basis of the traditional fuel car structure. Please refer to Figure 1 , which shows an architecture diagram of an automobile applying a micro hybrid system (P0-48V system), which includes a motor 1 (48V-EM), an engine 2, a transmission belt 3 (Belt), a 48V battery 4 (48V battery), a direct current-direct current converter 5 (DC / DC). The main functions of the micro hybrid system include: 1. The 48V motor drag torque is larger than that of the traditional 12V starter, so the 48V motor starting can drag the engine speed higher, improving the comfort of start-stop; 2. When the vehicle brakes or slides, the energy recovered during braking is stored to assist during starting and acceleration to improve acceleration performance; 3. In driving conditions, the hybrid control unit (HCU) will distribute the corresponding torque to the engine and motor according to the lowest equivalent fuel consumption strategy under the premise of meeting the driver's demand torque, adjust the engine operating condition, and make the system run in the optimal energy consumption interval.

[0003] Generally, the micro hybrid system transmits torque through the transmission belt 3, and the diameter of the pulley at the engine 2 end is larger than that of the pulley at the motor 1 end. The torque generated by the combustion of the engine 2 or the torque of the engine 2 when the vehicle slides is transmitted to the motor 1 through the transmission belt 3 to realize power generation and energy storage, charging the 48V battery 4 or charging the 12V battery (12V battery) through the direct current-direct current converter 5; when the maximum torque of the engine 2 is insufficient to meet the driver's demand torque during starting, rapid acceleration or highland conditions, the motor 1 can output torque through the transmission belt 3 to assist the crankshaft end of the engine 2, and then transmitted to the transmission and wheels, thereby improving the acceleration performance; when starting, the 48V battery 4 outputs energy, and the motor 1 outputs torque to the engine 2 through the transmission belt 3 to quickly reach the target idle state, improving the starting comfort.

[0004] It can be seen that the transmission belt 3 for torque transmission plays an important role in the micro-mixing system. In actual situations, the transmission belt 3 cannot maintain the ideal speed ratio. Due to the elasticity of the transmission belt 3, small amplitude slip is inevitably generated under acceleration and deceleration and the like. Such small amplitude slip will not have a great impact on the transmission torque, but large amplitude slip of the transmission belt 3 should be avoided. When the transmission belt 3 is selected and designed, the maximum torque allowed by the system should be applied to the transmission belt 3 to ensure that large amplitude slip does not occur.

[0005] However, due to some extreme situations such as severe aging of the transmission belt 3, excessive load, and decrease of the friction coefficient after wading, the transmission belt 3 will slip greatly, which will cause the following problems: a. The large amplitude slip will convert part of the torque into waste heat, reduce the transmission efficiency, and accelerate the wear and heating of the transmission belt 3; b. The large amplitude slip will also make the torque distribution between the motor 1 and the engine 2 unable to be accurately controlled, so that the driven wheel speed is reduced or even fails to work; c. The large amplitude slip will produce abnormal noise. The above problems will eventually lead to damage of the transmission belt 3 and deterioration of energy consumption, drivability, and start-stop comfort.

[0006] In the prior art, the motor controller directly powers off only when the slip fault exceeds a certain number of times, which is easy to cause false positives or false negatives, and the post-processing measures after the slip is judged are too harsh and single. SUMMARY

[0007] The purpose of the present application is to provide a slip processing method for a micro-mixing system transmission belt and a car to solve the problem that the existing transmission belt slip judgment logic is easy to cause false positives or false negatives and the post-processing measures are single.

[0008] To solve the above technical problems, the present application provides a slip processing method for a micro-mixing system transmission belt, which comprises:

[0009] According to the current working condition, a corresponding threshold value is set, which includes a judgment threshold value, a time threshold value, and a number threshold value;

[0010] The speed difference between the motor speed and the speed ratio conversion speed of the engine is obtained;

[0011] The relationship between the speed difference and the judgment threshold value corresponding to the current working condition is monitored, and when the duration of the speed difference not less than the judgment threshold value reaches the time threshold value corresponding to the corresponding working condition, a slip event is recorded once;

[0012] The number of slip events corresponding to the current working condition is counted, and when the number of slip events reaches the number threshold value, the post-processing measure step corresponding to the current working condition is triggered.

[0013] Optionally, when the working condition is the hybrid mode driving working condition, the threshold value further comprises a repair threshold value and a duration threshold value, and the number threshold value comprises a first level threshold value;

[0014] When the number of the slip events reaches the first level threshold value, the post-processing measure step comprises:

[0015] multiplying the maximum torque of the motor by a limiting coefficient less than 1 to limit the maximum torque of the motor;

[0016] monitoring and judging the relationship between the speed difference and the repair threshold value on the basis of the limited maximum torque, and if the duration that the speed difference is less than the repair threshold value reaches the duration threshold value, determining that the current processing measure is effective, returning and continuing to execute the step of monitoring the relationship between the speed difference and the judgment threshold value and the step of counting the number of the slip events corresponding to the current working condition.

[0017] Optionally, before returning and continuing to execute the step of monitoring the relationship between the speed difference and the judgment threshold value and the step of counting the number of the slip events corresponding to the current working condition, the post-processing measure step further comprises:

[0018] multiplying the limited maximum torque by a recovery coefficient greater than 1, wherein the product of the limiting coefficient and the recovery coefficient is less than 1.

[0019] Optionally, the number threshold value comprises a second level threshold value, and the second level threshold value is greater than the first level threshold value;

[0020] if the speed difference is not less than the repair threshold value or the duration that the speed difference is less than the repair threshold value does not reach the duration threshold value, judging whether the number of the slip events reaches the second level threshold value;

[0021] if the number of the slip events reaches the second level threshold value, prohibiting the start-stop shutdown, and monitoring and judging the relationship between the speed difference and the repair threshold value on the basis of the limited maximum torque and the prohibited start-stop shutdown;

[0022] if the number of the slip events does not reach the second level threshold value, monitoring and judging the relationship between the speed difference and the repair threshold value on the basis of the limited maximum torque.

[0023] Optionally, after the start-stop shutdown is prohibited, if the duration that the speed difference is less than the repair threshold value reaches the duration threshold value, determining that the current processing measure is effective, canceling the prohibition of the start-stop shutdown, and returning and continuing to judge whether the number of the slip events reaches the second level threshold value on the basis of the limited maximum torque.

[0024] Optionally, the number threshold comprises a third level threshold, the third level threshold is greater than the second level threshold; after the start-stop shutdown is prohibited, if the speed difference is not less than the repair threshold, or the duration that the speed difference is less than the repair threshold does not reach the duration threshold, it is judged whether the number of the slip events reaches the third level threshold;

[0025] If the number of the slip events reaches the third level threshold, the start-stop shutdown and the power assisting and power generation are prohibited, and the relationship between the speed difference and the repair threshold is monitored and judged based on the prohibition of the start-stop shutdown and the power assisting and power generation;

[0026] If the number of the slip events does not reach the third level threshold, the relationship between the speed difference and the repair threshold is monitored and judged based on the limitation of the maximum torque and the prohibition of the start-stop shutdown.

[0027] Optionally, after the start-stop shutdown and the power assisting and power generation are prohibited, if the duration that the speed difference is less than the repair threshold reaches the duration threshold, it is determined that the current processing measure is effective, the power assisting and power generation are cancelled, and the step of judging whether the number of the slip events reaches the third level threshold is returned and continued based on the limitation of the maximum torque and the prohibition of the start-stop shutdown.

[0028] Optionally, the number threshold comprises a fourth level threshold, the fourth level threshold is greater than the third level threshold; after the start-stop shutdown, the power assisting and power generation are prohibited, if the speed difference is not less than the repair threshold, or the duration that the speed difference is less than the repair threshold does not reach the duration threshold, it is judged whether the number of the slip events reaches the fourth level threshold;

[0029] If the number of the slip events reaches the fourth level threshold, the start-stop shutdown, the power assisting and power generation are prohibited, and a fault indication signal is sent, and the step of attempting to cancel the post-processing measure is not performed in the current driving cycle;

[0030] If the number of the slip events does not reach the fourth level threshold, the relationship between the speed difference and the repair threshold is monitored and judged based on the prohibition of the start-stop shutdown and the power assisting and power generation.

[0031] Optionally, when the working condition is a starting working condition of starting the engine by dragging the engine by the motor, the post-processing measure step comprises:

[0032] Switching to starting the engine by a starter, and judging whether the starting is successful;

[0033] If the starting is successful, the number of the slip events in the current starting process is added to a global count value, and the starting working condition is ended;

[0034] If the starting fails, return to reuse the motor to drag the engine to start, and perform the steps of monitoring the relationship between the speed difference and the judgment threshold corresponding to the current working condition and the step of counting the number of slip events corresponding to the current working condition.

[0035] Optionally, the slip processing method of the micro hybrid system transmission belt further comprises:

[0036] The global count value of the number of slip events under each working condition is accumulated, and the power-off is kept without clearing;

[0037] If the global count value exceeds the accumulation threshold value, and the slip that cannot be repaired occurs in the hybrid mode driving working condition, a maintenance instruction signal is sent out;

[0038] The global count value is configured to be reset to zero after maintenance.

[0039] To solve the above technical problems, the application also provides an automobile comprising a micro hybrid system, wherein the micro hybrid system comprises a transmission belt configured to perform slip detection and processing according to the slip processing method of the micro hybrid system transmission belt as described above.

[0040] In summary, in the slip processing method of the micro hybrid system transmission belt and the automobile provided by the application, the slip processing method of the micro hybrid system transmission belt comprises: setting a corresponding threshold value according to the current working condition, the threshold value comprising a judgment threshold value, a time threshold value and a number threshold value; obtaining the speed difference between the motor speed and the speed ratio converted speed of the engine; monitoring the relationship between the speed difference and the judgment threshold value corresponding to the current working condition, recording a slip event when the duration of the speed difference not less than the judgment threshold value reaches the time threshold value corresponding to the corresponding working condition; counting the number of slip events corresponding to the current working condition, and triggering the corresponding post-processing measure step when the number of slip events reaches the number threshold value.

[0041] In this way, different threshold values are set according to different standards in different working conditions, which can identify slip faults and judge the severity of slip, and then trigger different post-processing measures, so as to avoid false positives or false negatives. Further, the advantages and disadvantages of the post-processing measures for slip faults that can be weakened or eliminated are graded and optimized, and relatively mild post-processing measures can be taken in special working conditions or when the slip is not serious, and relatively severe measures can be taken when the slip is serious, so as to improve user experience and energy consumption while protecting the transmission belt. BRIEF DESCRIPTION OF DRAWINGS

[0042] Those skilled in the art will understand that the provided drawings are used to better understand the application, and do not constitute any limitation on the scope of the application.

[0043] Figure 1It is a kind of architecture of the automobile of micro-mixing system.

[0044] Figure 2 It is the running condition of micro-mixing system and its mutual conversion relationship of the embodiment of the application.

[0045] Figure 3 It is the flow chart of the slip processing method of the transmission belt of the micro-mixing system of the embodiment of the application.

[0046] Figure 4 It is the change trend diagram of each parameter when the transmission belt slips in the starting condition of the embodiment of the application.

[0047] Figure 5 It is the schematic diagram of the post-processing measure of the starting condition of the embodiment of the application.

[0048] Figure 6 It is the change trend diagram of each parameter when the transmission belt slips in the ESA stage of the embodiment of the application.

[0049] Figure 7 It is the change trend diagram of each parameter when the transmission belt slips in the power assisting condition and the power generation condition of the embodiment of the application.

[0050] Figure 8 It is the hierarchical optimization flow chart of the post-processing measure of the hybrid mode driving condition of the embodiment of the application.

[0051] In the drawings: 1-motor; 2-engine; 3-transmission belt; 4-48V battery; 5-direct current-direct current converter. DETAILED DESCRIPTION

[0052] In order to make the purpose, advantages and characteristics of the application more clear, the application is further described in detail below in combination with the drawings and specific embodiments. It should be noted that the drawings are all very simplified and not drawn in proportion, and are only used to facilitate and clearly assist the purpose of explaining the embodiment of the application. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different proportions are used.

[0053] As used in the present application, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. The term "or" is generally employed in its sense of "and / or" unless the context clearly dictates otherwise. The term "plurality" is generally employed in its sense of "two or more" unless the context clearly dictates otherwise. The terms "first," "second," "third," etc. are used only to describe different instances and do not imply or suggest relative importance or an implied indication of the number of the technical features indicated. Thus, features defined with "first," "second," "third" can explicitly or implicitly include one or at least two of the features. "One end" and "the other end" and "proximal end" and "distal end" generally refer to two parts corresponding to each other, which not only includes the end points. In addition, as used in the present application, "mounting", "connection", "connection", "one element" "provided" in another element should be broadly understood, generally only indicates that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the two elements can be directly or indirectly connected, coupled, cooperated or transmitted through intermediate elements, and cannot be understood as indicating or suggesting the spatial position relationship between the two elements, that is, one element can be in any position such as inside, outside, above, below or one side of another element, unless the content is otherwise clearly indicated. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used with respect to the exemplary embodiments as they are shown in the drawings, upward or upward direction is toward the top of the corresponding drawing, and downward or downward direction is toward the bottom of the corresponding drawing.

[0054] The purpose of the present application is to provide a micro-mixing system transmission belt slip processing method and a car to solve the existing transmission belt slip judgment logic easy to misreport or miss report, and the single problem of post-processing measures. The following is described with reference to the accompanying drawings.

[0055] Please refer to Figure 2 , which shows the operating conditions of a micro-mixing system and their mutual conversion relationship. At first start, it is first judged whether the motor (referring to 48V motor) is allowed to start. When the temperature is low or the 48V battery SOC is low, the first start can take the 12V starter to drag the engine to start. Under normal circumstances, enter the starting condition (referring to starting with 48V motor). After successful starting, enter the hybrid mode driving condition. In the hybrid mode driving condition, when the stop (including key stop and start-stop stop) is triggered, it is turned into the stop condition.

[0056] In a mild hybrid system, drive belt slippage can occur during starting (including initial start and start-stop), hybrid mode driving, and stopping (including ignition stop and start-stop). Furthermore, the operating conditions of a mild hybrid system are also affected by external factors such as temperature (air temperature or engine coolant temperature) and wading. The magnitude of the speed ratio change due to belt slippage varies under different temperatures, torques, and belt surface conditions.

[0057] Please refer to Figure 3 Based on the above analysis, this embodiment of the invention provides a method for dealing with slippage of the drive belt in a micro-hybrid system, comprising:

[0058] Step S1: Based on the current working conditions, set the corresponding thresholds, including the judgment threshold, duration threshold, and number of times threshold;

[0059] Step S2: Obtain the speed difference between the motor speed and the engine speed ratio conversion speed;

[0060] Step S3: Monitor the relationship between the speed difference and the judgment threshold corresponding to the current working condition. When the duration of the speed difference not being less than the judgment threshold reaches the duration threshold corresponding to the working condition, record a slippage event.

[0061] Step S4: Count the number of slip events corresponding to the current working condition. When the number of slip events reaches the threshold, trigger the post-processing steps corresponding to the current working condition.

[0062] ■The following explanation uses the starting condition as an example.

[0063] Please refer to the reference. Figure 4 This example illustrates the changing trends of various parameters when the transmission belt 3 slips during startup. During startup, the 48V battery outputs energy, and the motor 1 outputs torque to the engine 2 through the transmission belt 3 to quickly reach the target idle speed. The wheel of the motor 1 acts as the driving wheel (active wheel), and the crankshaft wheel of the engine 2 acts as the driven wheel (passive wheel). In the initial stage of startup, the speeds of both the motor 1 and the engine 2 are 0. When there is severe slippage, the speed of the engine 2 may remain at 0, while the speed of the motor 1 may reach more than 300 rpm. At this time, it is not appropriate to use the speed ratio to judge slippage. Based on the research and analysis, this embodiment uses the speed difference between the speed of the motor 1 and the speed ratio of the engine 2 to determine slippage. Specifically, it is shown in the following formula (1):

[0064] N em -(N engine ×i normal )=ΔN SlipSt Equation (1)

[0065] In equation (1), Nem N is the rotation speed (rpm) of the motor 1 engine i is the rotation speed (rpm) of the engine 2 normal ΔN is the ideal speed ratio SlipSt ΔN is the speed difference (rpm) between the motor 1 and the engine 2 after the speed ratio conversion is considered. The rotation speed of the engine 2 is multiplied by the ideal speed ratio, and then compared with the rotation speed of the motor 1. In the ideal state, the speed difference between the two is 0. When slipping occurs, the rotation speed of the motor 1 is greater than the rotation speed of the engine 2 multiplied by the ideal speed ratio, that is, ΔN SlipSt > 0.

[0066] Therefore, the corresponding speed difference threshold TH ΔnSlipSt (rpm) can be used as the judgment threshold of the speed difference. It can be understood that if formula (2) is met at this time, it is judged that the transmission belt 3 slips.

[0067] ΔN SlipSt ≥ TH ΔnSlipSt ……………………………………… Formula (2)

[0068] Further, in order to judge the severity of the slip and identify whether the post-processing measures need to be taken, the following formula (3) and formula (4) are set as the judgment conditions:

[0069] t SlipSt ≥ TH tSlipSt ……………………………………………… Formula (3)

[0070] C SlipSt ≥ TH CSlipSt ……………………………………………… Formula (4)

[0071] In formula (3), t SlipSt (ms) is the duration when formula (2) is met, and TH tSlipSt (ms) is the duration threshold. Formula (3) is used to prevent false judgments caused by formula (2) being met for a very short time. When formula (3) is met, it is judged that the current slip event occurs.

[0072] In formula (4), C SlipSt (times) is the number of times recorded when formula (3) is met, and TH CSlipSt (times) is the number threshold. Formula (4) is used to judge the severity of the slip and whether the post-processing measures need to be taken. When formula (3) is met, a slip event is recorded once. When formula (4) is met, that is, the number of times of the current slip event has reached the number threshold, it is determined that a serious slip occurs, and the post-processing measures need to be taken.

[0073] The judgment threshold, time threshold and number threshold in the starting condition can be obtained by 48V starting condition calibration in real vehicle. Further, the starting condition can be divided into first starting and start-stop starting. The slip physical background and judgment logic of the two are similar, but the judgment threshold, time threshold and number threshold of the two can be configured to be different.

[0074] The above example is illustrated by taking the first starting as an example. In the start-stop starting condition, the speed difference ΔN SlipSt in formula (1)~formula (4) can be replaced by the speed difference ΔN SlipSs between motor 1 and engine 2 after considering the speed ratio conversion in 48V start-stop starting condition. ΔnSlipSt The speed difference threshold TH ΔnSlipSs can be replaced by TH SlipSt , t SlipSt , C tSlipSt , TH CSlipSt , TH SlipSs , t SlipSs , C tSlipSs , TH CSlipSs , TH ΔnSlipSt The steps and principles of start-stop starting condition can be referred to the first starting condition, which will not be repeated here.

[0075] Generally, the first starting has a greater tendency to slip than the start-stop starting, and the threshold of the condition with a large tendency to slip can be set to be larger than the threshold of the condition with a small tendency to slip, that is, for the first starting and start-stop starting, the judgment threshold TH ΔnSlipSt , time threshold TH tSlipSt and number threshold TH CSlipSt of the first starting can be set relatively large. In addition, temperature (such as air temperature or engine coolant temperature) also affects the tendency of the transmission belt 3 to slip, and the tendency of the transmission belt 3 to slip is relatively small near room temperature, while the tendency of the transmission belt 3 to slip increases at high temperature or low temperature. Therefore, the judgment threshold, time threshold and number threshold can also be corrected according to the temperature.

[0076] Preferably, before the slip judgment step of the starting condition is performed, in order to improve the slip fault recognition accuracy and prevent misjudgment caused by signal accuracy, the following preconditions can also be set:

[0077] ① The temperature signal, engine crankshaft speed signal and motor speed signal are fault-free;

[0078] ② The engine is in starting state or has not entered the running state of torque structure;

[0079] ③ The starting device is 48V motor starting, not 12V starter starting.

[0080] Please refer toFigure 5 Further, the post-processing step of the starting condition includes:

[0081] Step S5a1: Switch to the starter (12V starter) to drag the engine 2 to start, and determine whether the starting is successful;

[0082] Step S5a2: If the starting is successful, the number of slip events C SlipSt in this starting process is accumulated to the global count value C SlipNV , and the starting condition is ended, and the hybrid mode driving condition is entered; optionally, ΔN SlipSt , t SlipSt and C SlipSt are cleared at this time.

[0083] Step S5a3: If the starting fails, return to use the motor 1 to drag the engine 2 to start, and perform steps S3 and S4.

[0084] The global count value C SlipNV is a global count value of the number of slip events in each condition, which is configured to be not cleared when power is off. If the global count value exceeds the accumulation threshold value, and the slip cannot be repaired in the hybrid mode driving condition, a maintenance instruction signal is sent to prompt the vehicle to the maintenance station for inspection; the global count value is configured to be zero after maintenance, for example, it can be zeroed by an instrument.

[0085] The following describes the shutdown condition. The shutdown condition includes key-off and start-stop shutdown, wherein the key-off refers to actively triggering the shutdown, and is not limited to achieving the shutdown by rotating the key. Some embodiments can be achieved by triggering the off button. The start-stop shutdown is the automatic shutdown of the vehicle according to the vehicle speed and other conditions when the vehicle is in the start-stop mode. In some embodiments, the start-stop shutdown is triggered when the vehicle is switched from driving to stopping.

[0086] Please refer to Figure 6 which shows an exemplary trend of changes in various parameters when the transmission belt 3 slips in the ESA stage of shutdown,

[0087] In the micro-hybrid system, the shutdown condition preferably triggers the motor stop assist mode ESA (Engine Stop Assist) mode. In the shutdown condition, the motor 1 outputs a negative torque to drag the engine 2 to about 250 rpm, and then the speed of the motor 1 rapidly drops to 0, while the speed of the engine 2 drops slower than the speed of the motor 1 due to inertia. The purpose of setting the motor stop assist mode ESA is to quickly pass through the resonance zone, and to optimize the vehicle NVH during shutdown.

[0088] Understandably, due to the operating principle of the Motor Stop Assist Mode (ESA), a significant speed difference will occur between Motor 1 and Engine 2 during ESA execution. Comparative experiments using a new belt revealed a relatively large speed difference between Motor 1 and Engine 2 during ESA execution. Existing slippage detection logic, failing to differentiate operating conditions, is easily misinterpreted as a slippage fault, leading to false alarms.

[0089] In this embodiment, the speed difference between the rotational speed of motor 1 and the speed ratio converted from the rotational speed of engine 2 is also used to determine slippage. Specifically, it is shown in equation (5):

[0090] (N engine ×i normal )-N em =ΔN slipESA Equation (5)

[0091] Where ΔN slipESA To account for the speed difference (rpm) between motor 1 and engine 2 during shutdown after speed ratio conversion, this embodiment sets the threshold based on the current operating conditions. Therefore, it can be ΔN tailored to the characteristics of the shutdown condition. slipESA Set a relatively large judgment threshold. This ensures that even under shutdown conditions, the speed difference ΔN is not detected. slipESA Even if it's relatively large, it won't be mistaken for a slipping incident.

[0092] ■ Hybrid driving conditions take up more time than starting and stopping conditions, and involve more changing factors and objective conditions. Therefore, judging slippage in hybrid driving conditions is relatively more complex. For further details, please refer to... Figure 7 The hybrid driving mode can be divided into two operating modes: power assist and generator generation. In power assist mode, the 48V battery 4 outputs energy, and motor 1 outputs torque to engine 2 via transmission belt 3. The motor 1's wheel acts as the drive wheel, and the engine 2's crankshaft wheel acts as the driven wheel. In generator generation mode, the engine 2's crankshaft wheel acts as the drive wheel, and the motor 1's wheel acts as the driven wheel. Engine 2 drives motor 1 to rotate and generate electricity via transmission belt 3. If motor 1 neither assists nor generates electricity, the engine 2's crankshaft wheel will cause the motor 1's wheel to spin freely. At this time, the speed ratio is close to the ideal speed ratio, and the speed difference after considering the ideal speed ratio is also close to 0. However, in power assist and generator generation modes, transmission belt 3 may slip.

[0093] In hybrid driving mode, if motor 1 slips during discharge assist, it will often slip during power generation as well, and vice versa. The following explanation uses the power assist mode as an example. For power assist mode, the speed difference between the speed of motor 1 and the speed ratio conversion speed of engine 2 is used to determine slippage. Specifically, it is shown in equation (6):

[0094] N em -(N engine ×i normal )=ΔN SlipDch Equation (6)

[0095] ΔN SlipDch To account for the discharge assist after speed ratio conversion, the speed difference (rpm) between motor 1 and engine 2 is calculated. The corresponding speed difference threshold TH is then used. ΔnSlipDch (rpm) serves as the threshold for judging the speed difference during discharge assistance. Understandably, if the following equation (7) is satisfied at this time, it is judged that the transmission belt 3 is slipping.

[0096] ΔN SlipDch ≥TH ΔnSlipDch ………………………………………Formula (7)

[0097] Furthermore, in order to determine the severity of slippage and whether post-treatment measures are necessary, the following judgment conditions are set in equations (8) and (9):

[0098] t SlipDch ≥TH tSlipDch Equation (8)

[0099] C SlipDch ≥TH CSlipDch Equation (9)

[0100] In equation (8), t SlipDch (ms) is the duration when equation (7) is satisfied, TH tSlipDch (ms) is the duration threshold. Equation (8) is used to prevent false judgments caused by satisfying equation (7) in a very short time. When equation (8) is satisfied, it is determined that a slippage event has occurred. In equation (9), C SlipDch (times) is the cumulative number of times recorded when equation (8) is satisfied, TH CSlipDch (times) is the number of times threshold. Equation (9) is used to determine the severity of slippage and whether post-processing measures are required. When equation (8) is satisfied, a slippage event is recorded. When equation (9) is satisfied, that is, the number of times the current slippage event has reached the number of times threshold, it is determined that serious slippage has occurred and post-processing measures are required.

[0101] As analyzed above, the duration of hybrid driving conditions is longer than that of start-up and stop conditions. During driving, some slippage caused by factors may be reversible. For example, slippage caused by wading is reversible. After taking appropriate post-treatment measures, the slippage will disappear after a period of water evaporation and the transmission belt 3 dries. Therefore, it is necessary to further judge and process whether the slippage fault has been repaired in hybrid driving conditions. Thus, when the driving condition is a hybrid driving condition, the threshold also includes a repair threshold and a duration threshold. In hybrid driving conditions, the speed difference between the speed of motor 1 and the speed ratio conversion speed of engine 2 can be used to judge slippage repair. The following also uses the power assist condition as an example. In the power assist condition, the judgment basis for slippage repair is as shown in the following formula (10):

[0102] ΔN SlipDch <THΔ nSlipDchHeal Equation (10)

[0103] Among them, THΔ nSlipDchHeal To repair the threshold. At the speed difference ΔN SlipDch Less than the repair threshold THΔ nSlipDchHeal At this point, it can be understood that the slippage of the transmission belt 3 has been improved and repaired.

[0104] Furthermore, to prevent misjudgment caused by the extremely short time that equation (10) is satisfied, a continuous threshold TH is set. tSlipDchHeal And the duration t when equation (10) is satisfied. SlipDchHeal With the continuous threshold TH tSlipDchHeal The judgment is made according to the following formula (11):

[0105] t SlipDchHeal ≥TH tSlipDchHeal ………………………………………Formula (11)

[0106] When both equations (10) and (11) are satisfied, it indicates that the slippage of the transmission belt 3 has been improved and repaired within a certain duration, and it can be considered that the slippage of the transmission belt 3 has been restored at this time. Optionally, slippage caused by wading is generally reversible, so when exiting the current driving cycle, ΔN can be adjusted. SlipDch t SlipDch t SlipDchHeal C SlipDch Perform a reset.

[0107] Since the duration of the hybrid driving condition is long, the severity of the transmission belt 3 slip is actually also quite different, and it is not suitable to adopt a one-size-fits-all post-processing measure. Preferably, the pros and cons of the post-processing measures that can weaken or eliminate the slip fault are graded and optimized to improve user experience, improve energy consumption, and protect the transmission belt 3. Returning to equation (9), the number of times TH CSlipDch is selected to be graded, and the number of times C SlipDch recorded when equation (8) is satisfied is compared with different levels of number thresholds, and when the number threshold of the corresponding level is satisfied, the corresponding post-processing measure is executed.

[0108] Please refer to Figure 8 , in an alternative example, the number of times threshold includes a first level threshold TH CSlipDchWarn , a second level threshold TH CSlipDchAlrm , a third level threshold TH CSlipDchErr and a fourth level threshold TH CSlipDchErrFtl . Wherein TH CSlipDchWarn <TH CSlipDchAlrm <TH CSlipDchErr <TH CSlipDchErrFtl . The corresponding equation (9) is also extended to the following equations (12)-(15), and the corresponding post-processing steps can be sequentially optimized and executed. It should be noted that the number of times thresholds are divided into four levels, which is only a preferred example and is not limited. In other embodiments, the number of times thresholds are not limited to being divided into four levels, but can also be divided into two levels, three levels or more levels.

[0109] C SlipDch ≥TH CSlipDchWarn ………………………………………………Equation (12)

[0110] C SlipDch ≥TH CSlipDchAlrm ………………………………………………Equation (13)

[0111] C SlipDch ≥TH CSlipDchErr ………………………………………………Equation (14)

[0112] C SlipDch ≥TH CSlipDchErrFtl ………………………………………………Equation (15)

[0113] In an example, when the number of times C SlipDch of the slip event reaches the first level threshold TH CSlipDchWarn , that is, equation (12) is satisfied, it means that a slight slip (defined as Warn level) occurs. At this time, the corresponding post-processing measure steps include:

[0114] Step S5b1: multiplying the maximum torque of the motor 1 by a limiting coefficient less than 1 to limit the maximum torque of the motor 1;

[0115] Step S5b2: monitoring and judging the relationship between the speed difference and the repair threshold on the basis of limiting the maximum torque;

[0116] Step S5b3: if the duration that the speed difference is less than the repair threshold reaches the duration threshold, determining that the current processing measure is effective, returning and continuing to execute the step of monitoring the relationship between the speed difference and the judgment threshold and the step of counting the number of slip events corresponding to the current working condition (i.e., steps S3 and S4);

[0117] Step S5b1 is multiplying the initial maximum torque of the motor 1 by a limiting coefficient, aiming to limit the maximum torque of the motor 1 to reduce or alleviate the occurrence of slip. The limiting coefficient should have a certain limiting effect on the maximum torque, and should not produce obvious feedback to the driver. In some embodiments, the limiting coefficient may, for example, be selected as 0.5-0.95, preferably 0.65-0.85, and more preferably 0.7, 0.75 or 0.8. It is further explained that since the motor 1 discharges to assist slip, it often accompanies slip when generating electricity. Therefore, the limitation of the maximum torque of the motor 1 is preferably to limit the torque of both the assist and the generation working conditions simultaneously, i.e., to limit the maximum output torque and the maximum generation torque.

[0118] In step S5b3, if the duration that the speed difference is less than the repair threshold reaches the duration threshold, i.e., when formula (10) and formula (11) are satisfied, it indicates that the slip of the transmission belt 3 has been improved and repaired, and it is determined that the current processing measure is effective. At this time, steps S3 and S4 can be executed on the basis of limiting the maximum torque, i.e., returning to the step of judging whether the number of slip events reaches the first level threshold.

[0119] Further, before returning to step S3 and step S4, the post-processing step further comprises step S5b4: multiplying the limited maximum torque by a recovery coefficient greater than 1, wherein the product of the limiting coefficient and the recovery coefficient is less than 1. After limiting the maximum torque so that formula (10) and formula (11) are satisfied, it can be attempted to gradually cancel the limitation of the maximum torque, and multiply the limited maximum torque by a recovery coefficient to slightly increase the limitation of the maximum torque. The selection of the recovery coefficient should ensure that the product of the limiting coefficient and the recovery coefficient is less than 1, so that the recovered maximum torque is still less than the initial maximum torque. The recovery coefficient can be selected to be 1.01-1.10, and preferably 1.05. It can be understood that the setting of the recovery coefficient further reduces the impact on the driving experience, and on the basis of being able to repair the slip of the transmission belt 3, the limitation of the maximum torque is minimized.

[0120] In step S5b2, the relationship between the speed difference and the repair threshold is monitored. If the speed difference is not less than the repair threshold, or the duration that the speed difference is less than the repair threshold does not reach the duration threshold, that is, formula (10) and formula (11) are not simultaneously satisfied, it indicates that the slip of the transmission belt 3 at this time has not improved or repaired, and there is still slip. At this time, step S5c1 can be performed: judging whether the number of slip events C SlipDch whether the second level threshold TH CSlipDchAlrm that is, judging whether formula (13) is satisfied, and performing further subsequent steps respectively.

[0121] If the number of slip events reaches the second level threshold, that is, formula (13) is satisfied, it indicates that moderate slip (defined as Alrm level) occurs. At this time, the corresponding post-processing step comprises:

[0122] Step S5c2: prohibiting start-stop shutdown, and monitoring and judging the relationship between the speed difference and the repair threshold on the basis of limiting the maximum torque and prohibiting start-stop shutdown;

[0123] Step S5c3: after prohibiting start-stop shutdown, if the duration that the speed difference is less than the repair threshold reaches the duration threshold, it is determined that the current processing measure is effective, the prohibition of start-stop shutdown is cancelled, and the step of judging whether the number of slip events reaches the second level threshold is returned and continued on the basis of limiting the maximum torque, that is, returning to step S5c1.

[0124] Step S5c3 is that after prohibiting start-stop shutdown, formula (10) and formula (11) are simultaneously satisfied, which indicates that the current post-processing method can eliminate moderate slip, and it is determined that the current processing measure is effective. At this time, start-stop shutdown can be cancelled, and step S5c1 is returned on the basis of limiting the maximum torque.

[0125] If the number of slip events does not reach the second level threshold, i.e. formula (13) is not satisfied, the relationship between the speed difference and the repair threshold is monitored and judged on the basis of limiting the maximum torque, i.e. returning to step S5b2.

[0126] In step S5c2, the relationship between the speed difference and the repair threshold is monitored and judged on the basis of limiting the maximum torque and prohibiting start-stop shutdown. If the speed difference is not less than the repair threshold, or the duration that the speed difference is less than the repair threshold does not reach the duration threshold, i.e. formula (10) and formula (11) are not satisfied at the same time, it indicates that the slip of the transmission belt 3 at this time has not improved or repaired, and there is still slip. At this time, step S5d1 can be performed: judging the number of slip events C SlipDch whether the third level threshold TH CSlipDchErr i.e. judging whether formula (14) is satisfied, and performing further subsequent steps respectively.

[0127] If the number of slip events reaches the third level threshold, i.e. formula (14) is satisfied, it indicates that a serious slip (defined as an Err level) occurs. At this time, the corresponding post-processing measure steps include:

[0128] Step S5d2: prohibiting start-stop shutdown and prohibiting assistance and power generation (i.e. at this time the motor 1 enters a voltage mode, completely prohibiting assistance and power generation torque, and only performing minimum demand power generation according to the load), and monitoring and judging the relationship between the speed difference and the repair threshold on the basis of prohibiting start-stop shutdown and prohibiting assistance and power generation;

[0129] Step S5d3: after prohibiting start-stop shutdown, assistance and power generation, if the duration that the speed difference is less than the repair threshold reaches the duration threshold, it is determined that the current processing measure is effective, the prohibition of assistance and power generation is cancelled, and the step of judging whether the number of slip events reaches the third level threshold on the basis of limiting the maximum torque and prohibiting start-stop shutdown is returned and continued, i.e. returning to step S5d1.

[0130] Step S5d3 is that formula (10) and formula (11) are satisfied at the same time after prohibiting start-stop shutdown, which indicates that the current post-processing method can eliminate serious slip, and it is determined that the current processing measure is effective. At this time, the start-stop shutdown can be cancelled, and step S5d1 is returned on the basis of limiting the maximum torque.

[0131] If the number of slip events does not reach the third level threshold, i.e. formula (14) is not satisfied, the relationship between the speed difference and the repair threshold is monitored and judged on the basis of limiting the maximum torque and prohibiting start-stop shutdown, i.e. returning to step S5c2.

[0132] In step S5d2, the relationship between the speed difference and the repair threshold is monitored and judged on the basis of prohibiting start-stop stop and prohibiting power assistance and power generation. If the speed difference is not less than the repair threshold, or the duration that the speed difference is less than the repair threshold does not reach the duration threshold, that is, formula (10) and formula (11) are not simultaneously satisfied, it indicates that the slip of the transmission belt 3 at this time has not improved or repaired, and there is still slip. At this time, step S5e1 can be executed: judging the number of slip events C SlipDch whether the fourth level threshold TH is reached CSlipDchErrFtl , that is, judging whether formula (15) is satisfied, and respectively executing further subsequent steps.

[0133] If the number of slip events reaches the fourth level threshold, that is, formula (15) is satisfied, it indicates that an extremely serious slip (defined as an ErrFtl level) occurs. At this time, the corresponding post-processing measure steps include:

[0134] Step S5e2: prohibiting start-stop stop, prohibiting power assistance and power generation, and issuing a fault indication signal, and no longer attempting to cancel the post-processing measure step in the current driving cycle. At the end of the current driving cycle, the number of slip events C SlipDch accumulated in the current driving cycle can be added to the global count value C SlipNV , and ΔN SlipDch , t SlipDch , C SlipDch are cleared.

[0135] If the number of slip events does not reach the fourth level threshold, that is, formula (15) is not satisfied, the relationship between the speed difference and the repair threshold is monitored and judged on the basis of prohibiting start-stop stop and prohibiting power assistance and power generation, that is, returning to step S5d2.

[0136] It should be noted that the above example is an example of power assistance working condition. For power generation working condition, the corresponding parameters and thresholds in formula (6)-(15) can be replaced by the corresponding parameters and thresholds in power generation working condition, and the positive and negative of torque and speed are considered. For example, formula (6) in power generation working condition can be replaced by formula (16):

[0137] (N engine × i normal )-N em = ΔN SlipCh ……………………………………… Formula (16)

[0138] ΔN SlipCh is the speed difference (r / min) of the motor 1 and the engine 2 considering the speed ratio conversion. In power generation working condition, the speed difference threshold TH ΔnSlipDch in formula (6)-(15) can be replaced by TH ΔnSlipChAs the judgment threshold of the speed difference during power generation, t SlipDch , C SlipDch , TH tSlipDch , TH CSlipDch , THΔ nSlipDchHeal , TH CSlipDchWarn , TH CSlipDchAlrm , TH CSlipDchErr , TH CSlipDchErrFtl may be replaced by t SlipCh , C SlipCh , TH tSlipCh , TH CSlipCh , THΔ nSlipChHeal , TH CSlipChWarn , TH CSlipChAlrm , TH CSlipChErr , TH CSlipChErrFtl , the steps and principles of each post-processing measure of the power generation condition can refer to the assist condition, which will not be repeated here.

[0139] The selection of some threshold values under each condition is shown below:

[0140]

[0141]

[0142] Optionally, the slip processing method of the micro-mixing system transmission belt further comprises:

[0143] Step S6: Accumulate the global count value C SlipNV of the number of slip events under each condition, and keep the power-off without clearing;

[0144] Step S7: If the global count value C SlipNV exceeds the accumulation threshold TH CSlipNVErrFtl , and the slip cannot be repaired in the hybrid mode driving condition, an overhaul instruction signal is issued;

[0145] Step S8: The global count value C SlipNV is configured to be set to zero after overhaul.

[0146] In step S5a2, the step of accumulating the number of slip events C SlipSt to the global count value C SlipNV in the starting condition is exemplarily explained. Similarly, in the shutdown condition and the hybrid driving condition, the number of all slip events can be accumulated to the global count value C SlipNV , and the power-off is kept without clearing. The accumulation threshold TH CSlipNVErrFtl may be set according to the actual situation, for example, it can be set to 1000. Once the global count value C SlipNV exceeds the accumulation threshold THCSlipNVErrFtl If the slipping occurs in the hybrid mode and cannot be repaired, a maintenance instruction signal is sent to prompt the vehicle to enter a maintenance station for maintenance. After the maintenance is completed, the maintenance station can set the global count value C SlipNV to zero through the instrument.

[0147] The embodiment of the present application also provides an automobile, which comprises a micro hybrid system, and the micro hybrid system comprises a transmission belt 3, which is configured to perform slipping detection and processing according to the slipping processing method of the micro hybrid system transmission belt as described above.

[0148] In the micro hybrid system transmission belt slipping processing method and the automobile provided by the present application, the micro hybrid system transmission belt slipping processing method comprises: setting a corresponding threshold value according to a current working condition, the threshold value comprising a judgment threshold value, a time threshold value and a number threshold value; obtaining a speed difference between a motor speed and a speed ratio converted speed of an engine; monitoring a relationship between the speed difference and the judgment threshold value corresponding to the current working condition, recording a slipping event when a duration of the speed difference not less than the judgment threshold value reaches the time threshold value corresponding to the corresponding working condition; counting a number of the slipping events corresponding to the current working condition, and triggering a post-processing measure step corresponding to the current working condition when the number of the slipping events reaches the number threshold value. In this way, the corresponding threshold value is set according to different standards in different working conditions, the slipping fault can be identified and the severity of the slipping can be judged, and then different post-processing measures are triggered, so that false positives or false negatives are less likely to occur. Further, the advantages and disadvantages of the post-processing measures for the slipping faults that can be weakened or eliminated are graded and optimized, relatively mild post-processing measures can be taken in special working conditions or when the slipping is not serious, and relatively severe measures can be taken when the slipping is serious, so that the user experience and energy consumption are improved while the transmission belt is protected.

[0149] It should be noted that the above several embodiments can be combined with each other. The above description is only a description of the preferred embodiments of the present application, and does not limit the scope of the present application. Any modification or modification of the above-mentioned embodiments by a person skilled in the art within the scope of the present application is also within the protection scope of the present application.

Claims

1. A method of slip handling of a drive belt of a micro-hybrid system, characterized in that The method comprises: setting a corresponding threshold according to the current working condition, the threshold comprising a judgment threshold, a time length threshold and a number threshold; obtaining a speed difference between the motor speed and the speed ratio converted speed of the engine, the speed ratio converted speed being the product of the speed of the engine and the ideal speed ratio; monitoring the relationship between the speed difference and the judgment threshold corresponding to the current working condition, and recording a slip event when the duration of the speed difference not being less than the judgment threshold reaches the time length threshold corresponding to the corresponding working condition; counting the number of slip events corresponding to the current working condition, and triggering a post-processing measure step corresponding to the current working condition when the number of slip events reaches the number threshold; when the working condition is a hybrid mode driving working condition, the threshold further comprises a repair threshold and a duration threshold, and the number threshold comprises a first level threshold; when the number of slip events reaches the first level threshold, the post-processing measure step comprises: multiplying the maximum torque of the motor by a limit coefficient less than 1 to limit the maximum torque of the motor; monitoring and judging the relationship between the speed difference and the repair threshold on the basis of limiting the maximum torque, and determining that the current processing measure is effective if the duration of the speed difference being less than the repair threshold reaches the duration threshold, returning and continuing to execute the steps of monitoring the relationship between the speed difference and the judgment threshold and counting the number of slip events corresponding to the current working condition.

2. The slip processing method of the micro hybrid system transmission belt according to claim 1, wherein before returning and continuing to execute the steps of monitoring the relationship between the speed difference and the judgment threshold and counting the number of slip events corresponding to the current working condition, the post-processing measure step further comprises: multiplying the limited maximum torque by a recovery coefficient greater than 1, wherein the product of the limit coefficient and the recovery coefficient is less than 1.

3. The slip handling method for a micro hybrid system drive belt according to claim 1, characterized by, The number threshold comprises a second level threshold, and the second level threshold is greater than the first level threshold; if the speed difference is not less than the repair threshold or the duration of the speed difference being less than the repair threshold does not reach the duration threshold, it is judged whether the number of slip events reaches the second level threshold; if the number of slip events reaches the second level threshold, the start-stop shutdown is prohibited, and the relationship between the speed difference and the repair threshold is monitored and judged on the basis of limiting the maximum torque and prohibiting the start-stop shutdown; if the number of slip events does not reach the second level threshold, the relationship between the speed difference and the repair threshold is monitored and judged on the basis of limiting the maximum torque.

4. The slip processing method of a micro hybrid system drive belt according to claim 3, characterized by After prohibiting the start-stop shutdown, if the duration of the speed difference being less than the repair threshold reaches the duration threshold, it is determined that the current processing measure is effective, the prohibition of the start-stop shutdown is cancelled, and it is returned and continued to judge whether the number of slip events reaches the second level threshold on the basis of limiting the maximum torque.

5. The slip handling method for a micro-hybrid system drive belt according to claim 3, characterized by The number threshold comprises a third level threshold, which is greater than the second level threshold; after the start-stop shutdown is prohibited, if the speed difference is not less than the repair threshold, or the duration that the speed difference is less than the repair threshold does not reach the duration threshold, it is determined whether the number of the slip events reaches the third level threshold; If the number of the slip events reaches the third level threshold, the start-stop shutdown, the power assistance and the power generation are prohibited, and the relationship between the speed difference and the repair threshold is monitored and determined based on the prohibition of the start-stop shutdown, the power assistance and the power generation; If the number of the slip events does not reach the third level threshold, the relationship between the speed difference and the repair threshold is monitored and determined based on the limitation of the maximum torque and the prohibition of the start-stop shutdown.

6. The slip processing method of a micro hybrid system drive belt according to claim 5, characterized by After the start-stop shutdown and the power assistance and the power generation are prohibited, if the duration that the speed difference is less than the repair threshold reaches the duration threshold, it is determined that the current processing measure is effective, the power assistance and the power generation are cancelled, and the step of determining whether the number of the slip events reaches the third level threshold is returned and continued based on the limitation of the maximum torque and the prohibition of the start-stop shutdown.

7. The slip processing method of a micro hybrid system drive belt according to claim 5, characterized by The number threshold comprises a fourth level threshold, which is greater than the third level threshold; after the start-stop shutdown, the power assistance and the power generation are prohibited, if the speed difference is not less than the repair threshold, or the duration that the speed difference is less than the repair threshold does not reach the duration threshold, it is determined whether the number of the slip events reaches the fourth level threshold; If the number of the slip events reaches the fourth level threshold, the start-stop shutdown, the power assistance and the power generation are prohibited, and a fault indication signal is sent, and the step of attempting to cancel the post-processing measure is not performed in the current driving cycle; If the number of the slip events does not reach the fourth level threshold, the relationship between the speed difference and the repair threshold is monitored and determined based on the prohibition of the start-stop shutdown and the power assistance and the power generation.

8. The slip handling method for a micro hybrid system drive belt according to claim 1, characterized by, The post-processing measure step comprises: Switching to a starter to drag the engine to start, and determining whether the starting is successful; If the starting is successful, the number of the slip events in the current starting process is added to a global count value, and the starting condition is ended; If the starting fails, returning to drag the engine to start by the motor again, and performing the step of monitoring the relationship between the speed difference and the determination threshold corresponding to the current working condition and the step of counting the number of the slip events corresponding to the current working condition.

9. The slip handling method for a micro-hybrid system drive belt according to claim 1, characterized by The slip processing method of the micro hybrid system transmission belt further comprises: A global count value of the number of the slip events in each working condition is accumulated, and the global count value is kept without being cleared after power-off; If the global count value exceeds an accumulation threshold, and the slip that cannot be repaired occurs in the hybrid mode driving working condition, a maintenance indication signal is sent; The global count value is configured to be reset to zero after maintenance.

10. An automobile comprising a micro-hybrid system, the micro-hybrid system comprising a drive belt, characterized in that The transmission belt is configured to perform slip detection and processing according to the slip processing method of the micro hybrid system transmission belt in any one of claims 1-9. The number threshold comprises a third level threshold, which is greater than the second level threshold; after the start-stop shutdown is prohibited, if the speed difference is not less than the repair threshold, or the duration that the speed difference is less than the repair threshold does not reach the duration threshold, it is determined whether the number of the slip events reaches the third level threshold; If the number of the slip events reaches the third level threshold, the start-stop shutdown, the power assistance and the power generation are prohibited, and a fault indication signal is sent, and the step of attempting to cancel the post-processing measure is not performed in the current driving cycle; If the number of the slip events does not reach the fourth level threshold, the relationship between the speed difference and the repair threshold is monitored and determined based on the prohibition of the start-stop shutdown and the power assistance and the power generation. The post-processing measure step comprises: Switching to a starter to drag the engine to start, and determining whether the starting is successful; If the starting is successful, the number of the slip events in the current starting process is added to a global count value, and the starting condition is ended; If the starting fails, returning to drag the engine to start by the motor again, and performing the step of monitoring the relationship between the speed difference and the determination threshold corresponding to the current working condition and the step of counting the number of the slip events corresponding to the current working condition. The slip processing method of the micro hybrid system transmission belt further comprises: A global count value of the number of the slip events in each working condition is accumulated, and the global count value is kept without being cleared after power-off; If the global count value exceeds an accumulation threshold, and the slip that cannot be repaired occurs in the hybrid mode driving working condition, a maintenance indication signal is sent; The global count value is configured to be reset to zero after maintenance. The transmission belt is configured to perform slip detection and processing according to the slip processing method of the micro hybrid system transmission belt in any one of claims 1-9.

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