Improvement control method and system for knocking sound of single planet row type hybrid gearbox

Abstract

The invention discloses an improvement control method and system for knocking sound of a single planet row type hybrid gearbox. The method comprises the steps that attaching torque control is activated; according to the running gear of the vehicle, a flywheel clinging control target generator torque control push rod is adopted to be clinging to a flywheel groove, and if the flywheel clinging control target generator torque value is lower than the original target generator driving torque, the original target generator driving torque is chased at the continuously-increased slope; when the driving torque of the original target generator switches the positive direction and the negative direction, direction switching is completed according to the torque slope value of the transition target generator, and then a push rod is tightly attached to a flywheel groove according to the switched direction; linear torque filtering and target generator driving torque filtering are added, and the slope of the target generator driving torque is calibrated. According to the invention, the knocking sound generated by the push rod and the groove in the flywheel locking mechanism and the gear knocking sound generated in the multi-stage gear clearance in the ECVT dual-motor pure electric driving mode of the gearbox can be improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle power devices, and in particular to a method and system for improving and controlling knocking noise of a single planetary gearbox hybrid transmission. Background Art

[0002] A structure of a planetary power split multi-speed hybrid transmission Figure 1 As shown, the engine flywheel is connected to the planetary carrier of the single planetary gear, the generator is connected to the sun gear and engaged on the left and right sides of the S2 synchronizer, so that the entire planetary gear is connected as one and the sun gear and the generator are relatively stationary, the ring gear is connected to the wheels through the differential and half-axles through the left and right sides of the S1 synchronizer with two sets of gear systems with different speed ratios, and the drive motor is also connected to the wheels through the differential and half-axles with another set of gear systems.

[0003] When the S2 synchronizer is in the middle position and the S1 synchronizer is to the left or right, the gearbox gear is ECVT. In the ECVT gear, when the engine is stopped, if the generator outputs positive torque, the engine will be dragged by the generator. At this time, the engine is fixed. Based on the planetary gear lever principle, if the generator outputs positive torque, after speed ratio conversion, it will be output through the wheel end as negative torque at the ring gear end. The lever method dynamic kinematics diagram at this time is shown in Figure 2 (a); if the generator outputs negative torque, after the same speed ratio conversion, it will be output to the wheel end as positive torque at the ring gear end, plus the drive motor torque output, the lever method dynamic kinematics diagram at this time is shown in Figure 2 (b), which can realize the dual-motor pure electric drive mode in which the generator and the drive motor participate in the vehicle drive at the same time. The two torque transmission paths in the ECVT dual-motor pure electric drive mode are as follows. Figure 3 As shown, the torque from the EM2 generator to the ring gear in these two torque transmission paths is the same, but the speed ratio from the two sides of the S1 synchronizer to the wheel end is different.

[0004] like Figure 3 As shown, a certain number of grooves are spaced at fixed angles on the flywheel, and two locking solenoid valves are fixed on the hybrid transmission housing side connected to the engine flywheel housing. The VECU sends an unlocking command to the lock controller, which controls the on and off of the solenoid valve coil and the return spring to extend and retract the solenoid valve push rod to lock and unlock the flywheel. At the same time, the lock controller feeds back the unlocking status of the solenoid valve to the VECU.

[0005] In order to ensure that the push rods on both sides of the locking solenoid valve are fully extended into the flywheel groove, there must be a certain gap between the top of the push rod and the two sides of the flywheel groove. When the flywheel is locked and enters the dual-motor pure electric drive mode, there will be four situations in which the locking solenoid valve push rod contacts and forces the two sides of the flywheel groove: there is a gap between the top of both push rods and the two sides of the groove, and the generator starts to output positive torque to drive the flywheel to move to the right, then the right push rod collides with the right side of the groove, as shown in Figure 4(a); the generator outputs negative torque to drive the flywheel to move to the left, then the left push rod collides with the left side of the groove, as shown in Figure 4(b); there is a gap between the left push rod and the left side of the groove, and the two sides are close together on the right side, the generator outputs negative torque to drive the flywheel to move in the opposite direction, then the left push rod collides with the left side of the groove, as shown in Figure 4(c); there is a gap between the right push rod and the right side of the groove, and the two sides are close together on the left side, the generator outputs positive torque to drive the flywheel to move forward, then the right push rod collides with the right side of the groove, as shown in Figure 4(d). In these four flywheel locking conditions, when the generator driving torque intervenes, a knocking sound will occur between the locking solenoid valve push rod and the flywheel groove.

[0006] In addition, in the ECVT dual-motor pure electric drive mode, the transmission path of the EM2 generator drive torque gear transmission system is long, the multi-stage gear contact surface is large and there is gear clearance, and the gear knocking sound will be generated when the fast and large drive torque intervenes. Therefore, a method for improving the knocking sound of a single planetary gear hybrid transmission is urgently needed. Summary of the invention

[0007] The main purpose of the present invention is to provide a control method and system for improving the knocking sound of a single planetary gear hybrid transmission, so as to improve the knocking sound generated by the push rod and the groove in the flywheel locking mechanism and the gear knocking sound generated in the multi-stage gear gap in the ECVT dual-motor pure electric drive mode.

[0008] The technical solution adopted by the present invention is a method and system for improving the knocking sound of a single planetary gearbox hybrid transmission, wherein the method comprises: when the current working condition satisfies the activation condition of the clamping torque control, activating the clamping torque control;

[0009] According to the driving gear of the vehicle, the push rod is closely attached to the flywheel groove by using the positive or negative flywheel close-fitting control target generator torque value. If the flywheel close-fitting control target generator torque is less than the original target generator drive torque, the original target generator drive torque is caught up with at a continuously increasing slope. When the original target generator drive torque switches the positive and negative directions, the positive and negative directions of the original target generator drive torque are switched according to the preset transition torque slope value, and then the push rod is closely attached to the flywheel groove according to the switched direction.

[0010] A linear torque filter is added to the target generator driving torque to calibrate the slope of the target generator driving torque; a target generator driving torque filter is added to the target generator driving torque, and the slope of the target generator driving torque is further calibrated according to a two-dimensional map composed of an unlimited slope target generator driving torque and a previous target generator driving torque.

[0011] Furthermore, the conditions for activating the tightening torque control include: the transmission gear enters the ECVT dual-motor pure electric drive mode; the VECU internally determines that the vehicle is allowed to drive; the driving motor and generator working modes are both torque modes and both have torque capabilities; the vehicle's gear lever position is in the stationary P gear or N gear, or the brake parking time is greater than the preset time in the D gear or R gear; the original target generator drive torque is within the preset range.

[0012] Further, the original target generator driving torque is within a preset range, specifically, a preset flywheel tightening torque positive limit, a flywheel tightening torque negative limit and an allowable torque offset, and the absolute values ​​of the flywheel tightening torque positive limit and the flywheel tightening torque negative limit are respectively added to the allowable torque offset, and both calculation results satisfy an absolute value greater than the original target generator driving torque value.

[0013] Furthermore, the method for achieving close contact between the push rod and the flywheel groove is specifically as follows: when the vehicle is in R gear ECVT dual-motor pure electric driving or D gear energy recovery driving, a positive torque control method is adopted, and before the target generator positive driving torque intervenes, the push rod is controlled to be close to one of the sides of the flywheel groove according to a preset positive flywheel close contact control target generator torque value, and if the original target generator driving torque value exceeds the positive flywheel close contact control target generator torque value, the positive flywheel close contact control target generator torque value is controlled to catch up with the original target generator driving torque value with a continuously increasing slope;

[0014] When the vehicle is driving in the D gear ECVT dual-motor pure electric drive or in the R gear energy recovery drive, the negative torque control method is adopted. Before the negative driving torque of the target generator intervenes, the push rod is driven to stick to the other side of the flywheel groove according to the preset negative flywheel sticking control target generator torque value. If the absolute value of the original target generator driving torque value exceeds the absolute value of the negative flywheel sticking control target generator torque value, the negative flywheel sticking control target generator torque value is controlled to catch up with the original target generator driving torque value at a slope with a continuously increasing absolute value.

[0015] Furthermore, when the original target generator driving torque switches between positive and negative directions, the switching of the original target generator driving torque direction is completed according to the preset transition target generator torque slope value. If the direction of the original target generator driving torque after switching is positive, the positive torque control method is adopted to achieve the push rod and one side of the flywheel groove in close contact. If the direction of the original target generator driving torque after switching is negative, the negative torque control method is adopted to achieve the push rod and the other side of the flywheel groove in close contact.

[0016] Furthermore, the method for obtaining the target generator torque value for positive flywheel tightness control is to preset a positive limit value of the flywheel tightness torque, a negative limit value of the flywheel tightness torque and an offset. If the original target generator driving torque value is greater than the positive limit value of the flywheel tightness torque, the positive limit value of the flywheel tightness torque is added with the preset offset, and the result is compared with the original target generator driving torque, and the larger value is used as the target generator torque value for positive flywheel tightness control; if the original target generator driving torque is not greater than the positive limit value of the flywheel tightness torque and greater than the negative limit value of the flywheel tightness torque, the positive limit value of the flywheel tightness torque is used as the target generator torque value for positive flywheel tightness control.

[0017] Furthermore, the negative flywheel tightness control target generator torque value is obtained in the following manner: if the original target generator driving torque value is less than the negative limit value of the flywheel tightness torque, the negative limit value of the flywheel tightness torque is subtracted from a preset offset, and the result is compared with the original target generator driving torque, and the smaller value is used as the negative flywheel tightness control target generator torque value; if the original target generator driving torque is not less than the negative limit value of the flywheel tightness torque and is less than the positive limit value of the flywheel tightness torque, the negative limit value of the flywheel tightness torque is used as the negative flywheel tightness control target generator torque value.

[0018] Furthermore, the calibration principle of the target generator driving torque filter for the target generator driving torque slope is that the magnitude of the target generator driving torque slope is proportional to the absolute value of the target generator driving torque, and the difference between the slopes corresponding to different target generator driving torques is a linear difference.

[0019] Furthermore, the method for calibrating the target generator driving torque slope according to the two-dimensional map is adapted to different vehicle driving directions.

[0020] Another aspect of the present invention provides a single planetary gearbox hybrid transmission system, which is adapted to the above-mentioned single planetary gearbox hybrid transmission knocking sound improvement control method.

[0021] The beneficial effects of the present invention are as follows: the present invention discloses a method and system for improving the knocking sound of a single planetary gearbox hybrid transmission. After activating the close torque control, according to the driving gear of the vehicle and the size of the original target generator drive torque value, the push rod is close to the flywheel groove by using positive or negative flywheel close control to control the target generator torque value. Linear torque filtering and target generator drive torque filtering are also added, and the slope of the target generator drive torque is calibrated. The present invention can effectively improve the knocking sound generated by the push rod and the groove in the flywheel locking mechanism and the gear knocking sound generated in the multi-stage gear gap in the ECVT pure motor dual-electric drive mode of the transmission, and extend the life of the locking mechanism.

[0022] Furthermore, the present invention limits the range of the original target generator drive torque to ensure that the knocking sound improvement strategy can always intervene when the original target generator torque is small;

[0023] Furthermore, the present invention presets an offset related to the flywheel clamping torque limit value to ensure that during the clamping torque control process, the target generator torque is always a constant value in the same direction and does not change with the change of the original target generator driving torque, so that the push rod and the side of the flywheel groove are continuously kept in close contact;

[0024] Furthermore, the present invention sets a calibration principle in which the absolute value of the target generator drive torque filter slope is proportional to the absolute value of the target generator drive torque, which can improve the knocking sound in the low torque segment and enhance the dynamic response in the high torque segment.

[0025] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the structure and torque transmission path of a single planetary gearbox of the present invention;

[0028] FIG. 2( a ) is a lever method dynamics analysis diagram of the single planetary gearbox of the present invention when moving forward in the ECVT dual-motor pure electric drive mode;

[0029] FIG2( b ) is a lever method dynamic analysis diagram of the single planetary gearbox of the present invention when moving backward in the ECVT dual-motor pure electric drive mode;

[0030] Figure 3 It is a schematic diagram of the flywheel and locking mechanism of the single planetary gearbox of the present invention;

[0031] FIG4( a ) is a schematic diagram of a flywheel groove and a locking solenoid valve push rod generating a knocking sound when the flywheel is locked according to the present invention;

[0032] FIG4( b ) is a schematic diagram of another flywheel locking state of the present invention, in which the flywheel groove and the locking solenoid valve push rod produce a knocking sound;

[0033] FIG4( c ) is a schematic diagram of the knocking sound produced by the flywheel groove and the locking solenoid valve push rod in the third flywheel locking state of the present invention;

[0034] FIG4( d ) is a schematic diagram of the knocking sound produced by the flywheel groove and the locking solenoid valve push rod in the fourth flywheel locking state of the present invention;

[0035] Figure 5 is a curve diagram showing the relationship between an achievable original target generator driving torque and a final target generator driving torque of the present invention;

[0036] Figure 6 A specific control logic block diagram of the method for improving the knocking sound of a single planetary gearbox hybrid transmission of the present invention;

[0037] Figure 7 It is a schematic diagram of the axis of the relationship between some torque values ​​of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] It should be noted that the illustrations provided in the embodiments of the present invention are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout type may also be more complicated.

[0040] In the present invention, it is also necessary to explain that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first" and "second" appear, they are only used for description and distinction purposes, and cannot be understood as indicating or implying relative importance.

[0041] Example 1

[0042] This embodiment provides a method for improving and controlling the knocking sound of a single planetary gearbox hybrid transmission, comprising the steps of:

[0043] S1. Determine whether the current working condition satisfies the activation condition of the tightening torque control.

[0044] Specifically, first ensure that the hybrid transmission gear is in ECVT and the solenoid valve is completely locked, that is, the ECVT dual-motor pure electric drive mode has been entered.

[0045] Furthermore, the activation conditions for the tightening torque control also include: the VECU internally determines that the vehicle is allowed to drive, that is, the vehicle is in the ready state; the driving motor and the generator are both torque modes and have a certain torque capacity; the gear lever is in the P gear or N gear and is stationary, or in the D gear or R gear when the brake is applied for a long time; the original target generator drive torque must be within a certain range, that is, the absolute value of the original target generator drive torque is less than the result of the positive flywheel tightening torque limit plus the allowable torque offset and the absolute value of the negative flywheel tightening torque limit plus the allowable torque offset. In this embodiment, the allowable torque offset is 3Nm. This is because the flywheel groove has contacted the locking solenoid valve push rod after the original target generator drive torque is higher than a certain value. At this time, the target drive torque can be directly transmitted, and the range of the original target generator drive torque must be greater than the knocking sound control torque range to ensure that the knocking sound improvement strategy can always intervene when the original target generator drive torque is small.

[0046] Furthermore, in order to reduce unnecessary electric power loss caused by the activation of the tooth-knocking generator torque control, which causes the generator to always apply the flywheel to closely control the target generator torque, the tooth-knocking generator torque control activation is not allowed when the vehicle is stationary. The vehicle is judged to be at a standstill when the vehicle speed is lower than a preset value, which is 2kph in this embodiment.

[0047] S2. Implement a corresponding tightening torque control strategy according to the gear position of the vehicle and the size of the original target engine driving torque.

[0048] Specifically, when the vehicle is driving in the R gear ECVT dual-motor pure electric drive or in the D gear energy recovery drive, the forward torque control method is adopted. Before the target generator positive drive torque intervenes, the forward flywheel is preset to tightly control the target generator torque value, and the push rod is controlled to be tightly attached to the right side of the flywheel groove according to the forward flywheel tightly controlling the target generator torque value. If the forward flywheel tightly controlling the target generator torque value is lower than the original target generator drive torque value, the original target generator drive torque value is caught up with at a continuously increasing slope.

[0049] Furthermore, a method for determining a target generator torque value for positive flywheel close contact control is to preset a calibrable positive limit value of the flywheel close contact torque and a negative limit value of the flywheel close contact torque. If the original target generator driving torque is higher than the calibrable positive limit value of the flywheel close contact torque, 3 Nm is taken in this embodiment, and the positive limit value is increased by a preset offset value to obtain a positive close contact control torque offset value, 1 Nm is taken in this embodiment, and the obtained positive close contact control torque offset value is compared with the original target generator driving torque, and the larger value is used as the positive flywheel close contact control target generator torque value. If the original target generator driving torque gradually changes in a negative direction, before it is lower than the negative limit value of the knocking sound torque, the positive close contact control torque offset value is still compared with the original target generator driving torque, and the larger value is used as the positive flywheel close contact control target generator torque value. In this way, even when the original target generator driving torque is close to 0, or even when the original target generator driving torque is about to become a smaller negative torque, the target generator driving torque is always kept at a positive constant value, so that the groove on the right side of the flywheel is in close contact with the locking solenoid valve push rod.

[0050] Specifically, when the vehicle is driving in the D gear ECVT dual-motor pure electric drive or in the R gear energy recovery drive, the negative torque control method is adopted. Before the negative driving torque of the target generator intervenes, the negative flywheel is preset to tightly control the target generator torque value, and the push rod is driven to stick to the left side of the flywheel groove according to the negative flywheel tightly controlling the target generator torque value. If the negative flywheel tightly controlling the target generator torque value is higher than the original target generator driving torque value, the original target generator driving torque value is caught up with at a slope whose absolute value continuously increases.

[0051] Furthermore, if the original target generator driving torque is lower than the calibrable negative limit of the flywheel adhesion torque, -3Nm is taken in this embodiment, and this negative limit is reduced by a preset offset, 1Nm is taken in this embodiment, and the obtained negative adhesion control torque offset value is compared with the original target generator driving torque value, and the smaller value is used as the negative flywheel adhesion control target generator torque value. If the original target generator driving torque gradually changes to the positive direction, until it exceeds the positive limit of the knocking sound torque, the negative adhesion control torque offset value is still compared with the original target generator driving torque, and the smaller value is used as the negative flywheel adhesion control target generator torque value. In this way, even when the original target generator torque is close to 0, or even when the original target generator driving torque is about to become a smaller positive torque, the target generator driving torque always remains at a negative constant value, so that the groove on the left side of the flywheel is in close contact with the locking solenoid valve push rod.

[0052] Specifically, when the original target generator driving torque switches between positive and negative directions, a transition target generator torque slope value is preset, and the switching of the original target generator driving torque direction is completed according to this preset value. If the original target generator driving torque direction is positive after switching, the above-mentioned positive torque control method is adopted; if the original target generator driving torque direction is negative after switching, the above-mentioned negative torque control method is adopted, and finally the push rod is made to fit tightly against the flywheel groove.

[0053] S3, add flywheel tightening torque filter control.

[0054] Specifically, after the clamping torque control is activated, when the target generator driving torque changes from 0 to the knocking sound torque limit, or when the target generator driving torque jumps between the positive or negative flywheel clamping control target generator torque values, it will still cause knocking sounds between the flywheel groove and the push rod. To solve this problem, a linear torque filter is added to the target generator driving torque based on the slope of the actual calibrated target generator driving torque. In this embodiment, the slope is 25Nm / s.

[0055] S4. Add final target generator drive torque filtering control.

[0056] Specifically, when the target generator driving torque continues to increase rapidly and the gap between the groove and the push rod is further reduced, knocking sound may still be produced. The existence of multi-stage gear gaps also causes the generator to produce gear knocking sound when it intervenes rapidly with a larger torque. Therefore, a target generator driving torque filter is added to the target generator driving torque.

[0057] Furthermore, based on the linear torque filter, the slope of the target generator drive torque is no longer a single limit value, but is calibrated by a two-dimensional map consisting of an unlimited slope target generator drive torque and a previous target generator drive torque, wherein the calibration principle is: the magnitude of the target generator drive torque slope is proportional to the absolute value of the target generator drive torque, and the difference between the slopes corresponding to different target generator drive torques is a linear difference. By calibrating the target generator drive torque slope based on this calibration principle, it is possible to eliminate and improve knocking sounds in the low torque segment and enhance the power response in the high torque segment. An example of a two-dimensional map of the rising slope of the target generator drive torque is shown in Table 1. At the same time, the slope of the target generator drive torque in different vehicle driving directions can be calibrated using a two-dimensional map.

[0058]

[0059] Table 1 Target generator torque rise slope map

[0060] Example 2

[0061] This embodiment provides a single planetary gearbox hybrid transmission system, which is adapted to the single planetary gearbox hybrid transmission knocking sound improvement control method described in Embodiment 1.

[0062] The present invention discloses a control method and system for improving the knocking sound of a single planetary gearbox hybrid transmission. Through intervention activation of clamping torque control and target generator drive torque filtering control, the knocking sound generated by the solenoid valve push rod and the flywheel groove when the generator drive torque intervenes in the ECVT dual-motor pure electric drive mode, and the gear knocking sound generated when the multi-stage gear transmission intervenes at a fast and large drive torque, can be effectively improved, thereby improving the durability of the flywheel locking mechanism while taking into account the dynamic responsiveness of the transmission.

[0063] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0064] The order of execution of each step in the above embodiment does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0065] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A method for improving the knocking sound of a single planetary gearbox hybrid transmission, characterized in that: include: When the current working condition meets the activation conditions of the tightening torque control, the tightening torque control is activated; According to the driving gear of the vehicle, the push rod is controlled to be close to the flywheel groove by using the positive or negative flywheel close control target generator torque value. If the flywheel close control target generator torque is less than the original target generator drive torque, the original target generator drive torque is caught up with the slope that continuously increases. When the original target generator driving torque switches between positive and negative directions, the positive and negative directions of the original target generator driving torque are switched according to the preset transition torque slope value, and then the push rod is closely attached to the flywheel groove according to the switched direction; A linear torque filter is added to the target generator driving torque to calibrate the slope of the target generator driving torque; a target generator driving torque filter is added to the target generator driving torque, and the slope of the target generator driving torque is further calibrated according to a two-dimensional map composed of an unlimited slope target generator driving torque and a previous target generator driving torque.

2. The method for improving and controlling the knocking sound of a single planetary gearbox hybrid transmission according to claim 1, characterized in that: The conditions for activating the clamping torque control include: the transmission gear enters the ECVT dual-motor pure electric drive mode; the VECU internally determines that the vehicle is allowed to drive; the drive motor and generator operating modes are both torque modes and both have torque capabilities; the vehicle's gear lever position is in a stationary P gear or N gear, or in a D gear or R gear with a brake stop time greater than a preset time; the original target generator drive torque is within a preset range.

3. The method for improving and controlling the knocking sound of a single planetary gearbox hybrid transmission according to claim 2, characterized in that: The original target generator driving torque is within a preset range, specifically, a preset flywheel tightness torque positive limit, a flywheel tightness torque negative limit and an allowable torque offset, and the absolute values ​​of the flywheel tightness torque positive limit and the flywheel tightness torque negative limit are respectively added to the allowable torque offset, and both calculation results satisfy an absolute value greater than the original target generator driving torque value.

4. The method for improving and controlling the knocking sound of a single planetary gearbox hybrid transmission according to claim 1, characterized in that: The method for achieving close contact between the push rod and the flywheel groove is specifically as follows: when the vehicle is in R gear ECVT dual-motor pure electric driving or D gear energy recovery driving, a positive torque control method is adopted, and before the target generator positive driving torque intervenes, the push rod is controlled to be close to one of the sides of the flywheel groove according to a preset positive flywheel close contact control target generator torque value, and if the original target generator driving torque value exceeds the positive flywheel close contact control target generator torque value, the positive flywheel close contact control target generator torque value is controlled to catch up with the original target generator driving torque value with a continuously increasing slope; When the vehicle is driving in the D gear ECVT dual-motor pure electric drive or in the R gear energy recovery drive, the negative torque control method is adopted. Before the negative driving torque of the target generator intervenes, the push rod is driven to stick to the other side of the flywheel groove according to the preset negative flywheel sticking control target generator torque value. If the absolute value of the original target generator driving torque value exceeds the absolute value of the negative flywheel sticking control target generator torque value, the negative flywheel sticking control target generator torque value is controlled to catch up with the original target generator driving torque value at a slope with a continuously increasing absolute value.

5. The method for improving and controlling the knocking sound of a single planetary gearbox hybrid transmission according to claim 4, characterized in that: When the original target generator driving torque switches between positive and negative directions, the switching of the original target generator driving torque direction is completed according to the preset transition target generator torque slope value. If the direction of the original target generator driving torque after switching is positive, the positive torque control method is adopted to achieve the push rod and one side of the flywheel groove in close contact. If the direction of the original target generator driving torque after switching is negative, the negative torque control method is adopted to achieve the push rod and the other side of the flywheel groove in close contact.

6. The method for improving and controlling the knocking sound of a single planetary gearbox hybrid transmission according to claim 4, characterized in that: The method for obtaining the target generator torque value for the positive flywheel tight control is to preset a positive limit value of the flywheel tight torque, a negative limit value of the flywheel tight torque and an offset value. If the original target generator driving torque value is greater than the positive limit value of the flywheel tight torque, the positive limit value of the flywheel tight torque is added with a preset offset value, and then compared with the original target generator driving torque, and the larger value is used as the target generator torque value for the positive flywheel tight control; If the original target generator driving torque is not greater than the positive limit of the flywheel tightening torque and greater than the negative limit of the flywheel tightening torque, the positive limit of the flywheel tightening torque is used as the positive flywheel tightening control target generator torque value.

7. The method for improving and controlling the knocking sound of a single planetary gearbox hybrid transmission according to claim 6, characterized in that: The negative flywheel tight control target generator torque value is obtained in the following manner: if the original target generator driving torque value is less than the negative limit value of the flywheel tight torque, the negative limit value of the flywheel tight torque is deducted from a preset offset, and the result is compared with the original target generator driving torque, and the smaller value is used as the negative flywheel tight control target generator torque value; If the original target generator driving torque is not less than the negative limit of the flywheel tightening torque and less than the positive limit of the flywheel tightening torque, the negative limit of the flywheel tightening torque is used as the negative flywheel tightening control target generator torque value.

8. The method for improving and controlling knocking noise of a single planetary gearbox hybrid transmission according to claim 1, characterized in that: The calibration principle of the target generator driving torque filter for the target generator driving torque slope is that the magnitude of the target generator driving torque slope is proportional to the absolute value of the target generator driving torque, and the difference between the slopes corresponding to different target generator driving torques is a linear difference.

9. The method for improving and controlling knocking noise of a single planetary gearbox hybrid transmission according to claim 1, characterized in that: The method for calibrating the target generator driving torque slope according to the two-dimensional map is adapted to different vehicle driving directions.

10. A single planetary gearbox hybrid transmission system, characterized in that: The system is adapted to the method for improving the control of knocking sound of a single planetary gearbox hybrid transmission as described in any one of claims 1-9.

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