Control method and device of electromagnetic clutch, electronic equipment and readable storage medium

Abstract

The invention provides a control method and device of an electromagnetic clutch, electronic equipment and a readable storage medium, the method is applied to a series-parallel hybrid power system, when the electromagnetic clutch is in a parallel mode, if a clutch separation instruction request is received, the output torque of a generator is adjusted based on the output torque of an engine, and the output torque of the generator is adjusted. The torque of the input shaft of the electromagnetic clutch is eliminated; if the input shaft torque is smaller than the input shaft torque threshold value, it is determined that twist clearing is completed, and an electromagnetic coil of the electromagnetic clutch is controlled to be powered off; after the electromagnetic coil is powered off, if the driven end and the driving end of the electromagnetic clutch are still not separated, the parameter range of the shaking torque is determined based on the rotating speed change rate of the driven end of the electromagnetic clutch; and based on the parameter range, generating a target jitter torque to adjust the output torque of the generator until the driven end and the driving end of the electromagnetic clutch are separated. Therefore, the direction, the upper limit value and the lower limit value of the shaking torque are determined through the rotating speed change rate of the driven end, and the electromagnetic clutch can be stably separated.

Description

Technical Field

[0001] The present application relates to the field of hybrid power technology, and in particular to a control method, device, electronic device and readable storage medium for an electromagnetic clutch. Background Art

[0002] As a clutch with simple mechanical structure, low cost and strong environmental adaptability, the tooth-type electromagnetic clutch is increasingly used in series-parallel hybrid transmissions. During the operation of the series-parallel hybrid system, if the tooth-type electromagnetic clutch cannot be disengaged when switching from parallel mode to series mode, the vehicle will not be able to drive normally, posing a serious safety hazard. Therefore, it is necessary to accurately control the disengagement process of the tooth-type clutch to ensure its stable disengagement.

[0003] The existing tooth-type electromagnetic clutch control method, after reducing the engine torque and generator torque to 0Nm to make the clutch input shaft torque clear, requests a fixed small load torque to the generator, and separates the electromagnetic clutch by torque jitter. However, the additional thrust generated by the speed change rate of the driven end of the electromagnetic clutch under different working conditions has different effects on the tooth side friction. The use of a fixed torque jitter method may result in the jitter torque being too small to overcome the friction separation, or the jitter torque being too large to cause the driven end teeth of the electromagnetic clutch to collide with the active end teeth, resulting in noise, vibration and acoustic vibration roughness (NVH) problems, and the stable separation of the electromagnetic clutch cannot be guaranteed. Summary of the invention

[0004] In view of this, the embodiments of the present application at least provide a control method, device, electronic device and readable storage medium for an electromagnetic clutch, which can determine the direction and upper and lower limits of the jitter torque by the speed change rate of the driven end, so that the electromagnetic clutch can be stably separated.

[0005] This application mainly includes the following aspects:

[0006] In a first aspect, an embodiment of the present application provides a control method for an electromagnetic clutch, which is applied to a series-parallel hybrid power system, and the method includes:

[0007] When the electromagnetic clutch of the series-parallel hybrid system is in the parallel mode, if a clutch release command request sent by the vehicle controller is received, the output torque of the generator of the series-parallel hybrid system is adjusted based on the output torque of the engine of the series-parallel hybrid system to clear the input shaft torque of the electromagnetic clutch;

[0008] If the input shaft torque is less than a preset input shaft torque threshold, it is determined that the input shaft torque clearance is completed, and the electromagnetic coil of the electromagnetic clutch is controlled to be de-energized;

[0009] After the electromagnetic coil is powered off, if the driven end and the driving end of the electromagnetic clutch are still not separated, a parameter range of the jitter torque is determined based on the speed change rate of the driven end of the electromagnetic clutch; the parameter range includes the torque direction, the torque upper limit value and the torque lower limit value of the jitter torque;

[0010] Based on the parameter range of the jitter torque, a target jitter torque is generated, and the output torque of the generator is adjusted according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated.

[0011] In a second aspect, an embodiment of the present application further provides a control device for an electromagnetic clutch, which is applied to a series-parallel hybrid power system. The control device for the electromagnetic clutch includes:

[0012] a torque clearing module, configured to adjust the output torque of the generator of the series-parallel hybrid system based on the output torque of the engine of the series-parallel hybrid system to clear the input shaft torque of the electromagnetic clutch when the electromagnetic clutch of the series-parallel hybrid system is in the parallel mode and receives a clutch release command request sent by the vehicle controller;

[0013] a clearing judgment module, configured to determine that the input shaft torque clearing is completed if the input shaft torque is less than a preset input shaft torque threshold, and control the electromagnetic coil of the electromagnetic clutch to be de-energized;

[0014] A parameter determination module, configured to determine a parameter range of the jitter torque based on a speed change rate of the driven end of the electromagnetic clutch if the driven end and the driving end of the electromagnetic clutch are still not separated after the electromagnetic coil is powered off; the parameter range includes a torque direction, an upper torque limit value, and a lower torque limit value of the jitter torque;

[0015] The jitter execution module is used to generate a target jitter torque based on the parameter range of the jitter torque, and adjust the output torque of the generator according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated.

[0016] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method of the electromagnetic clutch as described above.

[0017] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the electromagnetic clutch as described above are executed.

[0018] The control method, device, electronic device and readable storage medium of the electromagnetic clutch provided in the embodiment of the present application, wherein the method is applied to a series-parallel hybrid system, including: when the electromagnetic clutch of the series-parallel hybrid system is in parallel mode, if a clutch separation command request sent by the vehicle controller is received, then based on the output torque of the engine of the series-parallel hybrid system, the output torque of the generator of the series-parallel hybrid system is adjusted to clear the input shaft torque of the electromagnetic clutch; if the input shaft torque is less than the preset input shaft torque threshold, it is determined that the input shaft torque clearing is completed, and the electromagnetic coil of the electromagnetic clutch is controlled to be powered off; after the electromagnetic coil is powered off, if the driven end and the active end of the electromagnetic clutch are still not separated, then based on the speed change rate of the driven end of the electromagnetic clutch, the parameter range of the jitter torque is determined; the parameter range includes the torque direction, the torque upper limit value and the torque lower limit value of the jitter torque; based on the parameter range of the jitter torque, a target jitter torque is generated, and the output torque of the generator is adjusted according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated. In this way, the direction and upper and lower limits of the jitter torque are determined by the speed change rate of the driven end, so that the electromagnetic clutch can be stably separated.

[0019] Furthermore, the control method of the electromagnetic clutch provided in the embodiment of the present application can also obtain the first output torque of the engine and calculate the second output torque in the opposite direction required to offset the first output torque; keep the first output torque of the engine unchanged, and gradually increase the output torque of the generator in the opposite direction from zero torque until the output torque of the generator reaches the second output torque, thereby achieving the torque clearing of the electromagnetic clutch input shaft torque without reducing the engine torque, thereby improving the emission performance of the engine.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1An assembly schematic diagram of a series-parallel hybrid power system in an embodiment of the present application is shown;

[0023] Figure 2 A schematic diagram of the structure of the electromagnetic clutch in an embodiment of the present application is shown;

[0024] Figure 3 A flow chart of a control method of an electromagnetic clutch provided in an embodiment of the present application is shown.

[0025] Figure 4 It shows a control timing diagram of the electromagnetic clutch separation process in an embodiment of the present application;

[0026] Figure 5 A schematic diagram showing the motion mechanism of the electromagnetic clutch separation process in an embodiment of the present application;

[0027] Figure 6 A functional module diagram of a control device for an electromagnetic clutch provided in an embodiment of the present application is shown;

[0028] Figure 7 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0030] It is worth noting that before the present application was proposed, the separation process control of the tooth-type electromagnetic clutch in the prior art adopted a solution of reducing the engine torque to 0Nm and the generator torque to 0Nm, and then requesting a fixed small load torque to the generator to separate the electromagnetic clutch by torque jitter. However, when the engine torque is reduced from the optimal working point to 0Nm, the engine working point changes transiently, which will affect the engine emission performance. In addition, if the output torque of the engine and the generator are both 0Nm, then the gear transmission force between the engine and the generator is small and the speed is high, there may be repeated impacts of contact, disengagement, re-contact, and re-disengagement between the gear teeth, thereby causing nonlinear vibration of the gear system, and then bringing NVH problems. Moreover, the engine torque 0Nm control will cause the engine to be unable to generate electricity, affecting the power preservation function of the vehicle controller for the high-voltage battery. Most importantly, the use of a fixed generator jitter torque to control the separation of the electromagnetic clutch may cause the jitter torque to be too small to overcome the friction separation, or the jitter torque to be too large to cause the driven end teeth of the electromagnetic clutch to collide with the active end teeth, resulting in NVH problems, and the stable separation of the electromagnetic clutch cannot be guaranteed.

[0031] In view of the above problems, the embodiments of the present application relate to a control method, device, electronic device and readable storage medium of an electromagnetic clutch, wherein the method is applied to a series-parallel hybrid power system, including: when the electromagnetic clutch of the series-parallel hybrid power system is in parallel mode, if a clutch separation command request sent by a vehicle controller is received, then based on the output torque of the engine of the series-parallel hybrid power system, the output torque of the generator of the series-parallel hybrid power system is adjusted to clear the input shaft torque of the electromagnetic clutch; if the input shaft torque is less than the preset input shaft torque threshold, it is determined that the input shaft torque clearing is completed, and the electromagnetic coil of the electromagnetic clutch is controlled to be powered off; after the electromagnetic coil is powered off, if the driven end and the active end of the electromagnetic clutch are still not separated, then based on the speed change rate of the driven end of the electromagnetic clutch, the parameter range of the jitter torque is determined; the parameter range includes the torque direction, torque upper limit value and torque lower limit value of the jitter torque; based on the parameter range of the jitter torque, a target jitter torque is generated, and the output torque of the generator is adjusted according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated. In this way, the direction and upper and lower limits of the jitter torque are determined by the speed change rate of the driven end, so that the electromagnetic clutch can be stably separated.

[0032] Furthermore, the control method of the electromagnetic clutch provided in the embodiment of the present application can also obtain the first output torque of the engine and calculate the second output torque in the opposite direction required to offset the first output torque; keep the first output torque of the engine unchanged, and gradually increase the output torque of the generator in the opposite direction from zero torque until the output torque of the generator reaches the second output torque, thereby achieving the torque clearing of the electromagnetic clutch input shaft torque without reducing the engine torque, thereby improving the emission performance of the engine.

[0033] The following will be combined Figure 1 as well as Figure 2 The implementation of the embodiment of the present application is described in detail; the embodiment of the present application provides a control method for an electromagnetic clutch, which is applied to a series-parallel hybrid power system.

[0034] See also Figure 1 , Figure 1 The control method of the electromagnetic clutch provided in the embodiment of the present application can be applied to Figure 1 The series-parallel hybrid system shown. The series-parallel hybrid system includes: an electromagnetic clutch, an engine, a generator, a battery, a drive motor and a differential. In the parallel mode, the driven end and the active end of the electromagnetic clutch are connected, and the engine and the drive motor provide driving force to the wheels independently, and are coupled through the differential to drive the wheels together. In the series mode, the driven end and the active end of the electromagnetic clutch are separated, and the engine does not directly drive the wheels, but converts mechanical energy into electrical energy from the battery through the generator to power the drive motor, so that the drive motor can provide power to the wheels alone.

[0035] See also Figure 2 , Figure 2 Schematic diagram of the structure of the electromagnetic clutch in the embodiment of the present application. Figure 2 As shown, the electromagnetic clutch in the embodiment of the present application is a tooth-type electromagnetic clutch. When the electromagnetic clutch is in parallel mode, the electromagnetic coil is energized to generate magnetic force, which can drive the push ring to push the sliding end teeth (driven end) so that the sliding end teeth and the fixed end teeth (active end) are engaged. When the electromagnetic clutch is switched from parallel mode to series mode, the electromagnetic coil is controlled to be de-energized, and the sliding end teeth are separated from the fixed end teeth under the action of the return spring, and the electromagnetic clutch is switched to series mode.

[0036] A control method for an electromagnetic clutch provided in an embodiment of the present application is described in detail below. The control method for the electromagnetic clutch can be applied to the above-mentioned series-parallel hybrid power system.

[0037] See also Figure 3 , Figure 3This is a flow chart of a control method of an electromagnetic clutch provided in an embodiment of the present application. Figure 3 As shown, the control method of the electromagnetic clutch provided in the embodiment of the present application includes the following steps:

[0038] S301, when the electromagnetic clutch of the series-parallel hybrid system is in parallel mode, if a clutch disengagement command request sent by the vehicle controller is received, the output torque of the generator of the series-parallel hybrid system is adjusted based on the output torque of the engine of the series-parallel hybrid system to clear the input shaft torque of the electromagnetic clutch.

[0039] Here, when the electromagnetic clutch is in parallel mode, if a clutch separation command request sent by the vehicle control unit (VCU) is received, it means that the driven end and the active end of the electromagnetic clutch need to be separated. In order to avoid the electromagnetic clutch being unable to achieve effective separation due to the sliding end teeth (driven end) and the fixed end teeth (active end) of the electromagnetic clutch being too tightly engaged, the input shaft torque of the electromagnetic clutch needs to be unloaded before formal separation. Specifically, based on the output torque of the engine of the series-parallel hybrid system, the output torque of the generator of the series-parallel hybrid system is adjusted to clear the input shaft torque of the electromagnetic clutch.

[0040] S302: If the input shaft torque is less than a preset input shaft torque threshold, it is determined that the input shaft torque clearing is completed, and the electromagnetic coil of the electromagnetic clutch is controlled to be de-energized.

[0041] Here, the input shaft torque of the electromagnetic clutch is continuously monitored. When it is less than the preset input shaft torque threshold, it is considered that the input shaft torque has been cleared and the electromagnetic clutch can be separated. At this time, the electromagnetic coil of the electromagnetic clutch is powered off to prepare for the separation operation. In the embodiment of the present application, the input shaft torque threshold is 5Nm.

[0042] S303, after the electromagnetic coil is powered off, if the driven end and the driving end of the electromagnetic clutch are still not separated, determine the parameter range of the jitter torque based on the speed change rate of the driven end of the electromagnetic clutch; the parameter range includes the torque direction, torque upper limit value and torque lower limit value of the jitter torque.

[0043] Here, after the electromagnetic coil is powered off, if it is detected that the driven end and the active end of the electromagnetic clutch are still not separated, it means that the elastic force of the return spring of the electromagnetic clutch is less than the friction between the tooth side of the sliding end and the tooth surface of the fixed end. The sliding end teeth and the fixed end teeth are tightly engaged, and it is necessary to reduce the positive pressure of the above contact surface through the jitter torque to reduce its friction. Specifically, based on the speed change rate of the driven end of the electromagnetic clutch, the parameter range of the jitter torque is determined. Among them, the parameter range of the jitter torque includes the torque direction, the upper limit value of the torque, and the lower limit value of the torque.

[0044] S304, generating a target jitter torque based on the parameter range of the jitter torque, and adjusting the output torque of the generator according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated.

[0045] Here, according to the determined jitter torque parameter range, a suitable target jitter torque is generated, and the output torque of the generator is adjusted, and the jitter torque is transmitted to the input shaft of the electromagnetic clutch, so that the driven end and the active end of the electromagnetic clutch produce relative movement until separation is achieved.

[0046] Further, adjusting the output torque of the generator of the series-parallel hybrid system based on the output torque of the engine of the series-parallel hybrid system includes:

[0047] Step a1, obtaining a first output torque of the engine, and calculating a second output torque in the opposite direction required to offset the first output torque.

[0048] Here, when the clutch release command request sent by the vehicle controller is received, the current output torque of the engine is obtained through the sensor or control unit and recorded as the first output torque. According to the first output torque, the reverse second output torque required to offset the first output torque is calculated to offset the output torque of the engine and realize the input shaft torque clearance of the electromagnetic clutch.

[0049] Step a2, keeping the first output torque of the engine unchanged, and gradually increasing the output torque of the generator in the reverse direction from zero torque until the output torque of the generator reaches the second output torque.

[0050] Here, while keeping the first output torque of the engine unchanged, the output torque of the generator is gradually increased in the reverse direction from zero torque until it reaches the calculated second output torque in the reverse direction. By gradually increasing the output torque of the generator, the input shaft torque is ensured to drop smoothly, the shock caused by sudden changes is avoided, the smoothness of the input shaft torque clearing process is improved, and NVH problems are avoided.

[0051] Specifically, see Figure 4 , Figure 4: is a control timing diagram of the electromagnetic clutch separation process in the embodiment of the present application. Figure 4 As shown in the figure, after receiving the separation command request sent by the VCU, the engine torque control command remains unchanged, and the generator torque control command gradually increases from 0Nm in the reverse direction until the second output torque in the reverse direction is achieved. In this way, the electromagnetic clutch input shaft torque can be cleared without reducing the engine torque, thereby improving the emission performance of the engine.

[0052] Further, the speed change rate of the driven end of the electromagnetic clutch is determined according to the following steps:

[0053] Step b1, obtaining the first speed value of the engine when the clutch release command request sent by the vehicle controller is received, the second speed value of the engine when the input shaft torque clearing is completed, and the target time from receiving the clutch release command request to completing the input shaft torque clearing.

[0054] Here, when the clutch release command request sent by the vehicle controller is received, the current speed value of the engine is recorded as the first speed value n1. When the input shaft torque clearance is completed, the engine speed value is recorded again as the second speed value n2. At the same time, the time interval from receiving the clutch release command request to completing the input shaft torque clearance is recorded as the target time length Δt.

[0055] Step b2: Divide the difference between the second speed value and the first speed value by the target duration to obtain the speed change rate of the driven end of the electromagnetic clutch.

[0056] Here, the speed change rate of the driven end of the electromagnetic clutch is obtained by subtracting the second speed value n2 from the first speed value n1 and dividing it by the target time Δt. Specifically, it can be expressed as:

[0057]

[0058] Further, the torque lower limit value of the jitter torque is determined according to the following steps:

[0059] Step c1, obtaining the spring force of the return spring of the electromagnetic clutch, the circumferential radius of the driven end of the electromagnetic clutch, the friction coefficient of the tooth side contact surface of the electromagnetic clutch, and the rotational inertia of all components on the active end side of the electromagnetic clutch.

[0060] Here, after the clutch input shaft is torsion-free, the control electromagnetic coil is de-energized. At this time, if the spring force of the return spring is greater than the friction force between the tooth side of the sliding end tooth and the tooth surface of the fixed end tooth, the sliding end tooth will be reset to the disengaged position; if the spring force of the return spring is less than the above friction force, it is necessary to reduce the positive pressure of the above contact and thus reduce the friction force through jitter torque control.

[0061] Specifically, see Figure 5 , Figure 5 Schematic diagram of the motion mechanism of the electromagnetic clutch separation process in the embodiment of the present application. Figure 5 As shown, the speed direction of the driven end is selected as the positive direction. The necessary condition for the end teeth of the sliding end to be reset to the separation position is that the combined force of the spring and the electromagnetic force is greater than the friction force generated by the positive pressure of the end face of the end teeth, as shown in the following formula:

[0062] (F 弹簧 -F 电磁 )>F 正压力 ×μ.

[0063] Then we can get the following calculation formula:

[0064] Positive pressure calculation formula:

[0065] F 正压力 =-(F 抖动 +F 合力 -F 惯性 ). Among them, the positive pressure is opposite to the speed direction of the driven end.

[0066] Twitch torque T 抖动 The force generated is calculated using the formula:

[0067] Where r is the radius of the sliding end circle.

[0068] The force calculation formula generated by the inertia moment is:

[0069]

[0070] The average angular velocity calculation formula is:

[0071]

[0072] In the above formula, F 弹簧 F is the elastic force generated by the return spring after being compressed. 电磁 is the electromagnetic force generated by the electromagnetic coil during the clutch separation process. Since the separation process requires the electromagnetic coil to be powered off, the above electromagnetic force is 0, F 正压力 is the interaction force between the sliding end teeth and the fixed end teeth, F 正压力 There are three sources of torque F: the torque of the engine and the generator合力 ; Inertial force F generated by the speed change rate of the driven end of the electromagnetic clutch 惯性 ; Force F generated by the generator shaking torque 抖动 In the above clutch separation process, the front end of the clutch needs to be cleared before the electromagnetic clutch is powered off, so F 合力 It can be considered that the torque close to 0Nm is negligible, F 惯性 It can be considered as the quotient of the inertia moment generated by the equivalent inertia of the internal transmission rotating parts of the engine and generator assembly and the rotation radius, F 抖动 It is the quotient of the torque transmitted from the generator jitter torque to the sliding end teeth and the rotation radius. 平均 The angular acceleration can be calculated by the above formula, I 等效 is the moment of inertia of all components on the active end side of the electromagnetic clutch.

[0073] Obtain the various parameters required in the formula, including the spring force F of the return spring of the electromagnetic clutch 弹簧 , the circumferential radius r of the driven end of the electromagnetic clutch, the friction coefficient μ of the tooth side contact surface of the electromagnetic clutch, and the moment of inertia I of all components on the active end side of the electromagnetic clutch 等效 .

[0074] Step c2, determining the lower limit of the jitter torque according to the speed change rate of the driven end of the electromagnetic clutch, the spring force, the circumferential radius, the friction coefficient and the moment of inertia.

[0075] Here, based on the speed change rate of the driven end and the inertia of all components on the active end under the current working conditions, the positive pressure generated on the end tooth surface is obtained, and the minimum jitter torque of the clutch separation process can be obtained. Combined with the above formula, the minimum jitter torque of the clutch separation process is obtained:

[0076]

[0077] That is, the lower limit value of the jitter torque is determined according to the speed change rate, spring force, circumferential radius, friction coefficient and moment of inertia of the driven end of the electromagnetic clutch.

[0078] Furthermore, the torque direction of the jitter torque is the same as the direction of the speed change rate of the driven end of the electromagnetic clutch.

[0079] Here, it can be seen from the formula in step c2 that if the direction of the jitter torque in the electromagnetic clutch separation process is the same as the direction of the speed change rate of the driven end of the electromagnetic clutch, it can be ensured that the direction is the same as the inertia force generated by the sliding end teeth on the active end of the electromagnetic clutch, thereby making it easier to achieve separation between the end teeth.

[0080] Further, the torque upper limit value of the jitter torque is determined according to the following steps:

[0081] Step d1, obtaining the tooth gap size between the driven end teeth and the driving end teeth of the electromagnetic clutch, the separation gap size of the driven end teeth of the electromagnetic clutch and the mass of the push ring of the electromagnetic clutch.

[0082] Here, the theoretical upper limit of the jitter torque is obtained based on the tooth clearance and separation gap between the end teeth to avoid tooth knocking due to excessive jitter torque.

[0083] Specifically, Figure 5 As shown, the circular motion of the electromagnetic clutch is idealized as a plane linear motion in the x direction, and the radial separation process of the electromagnetic clutch is idealized as a plane linear motion in the y direction. The calculation process is as follows:

[0084] The moving distance in the x direction of the fixed end is:

[0085]

[0086] Where v0 is the initial velocity of the fixed end, a x is the average acceleration of the fixed end tooth, which can be derived from the above formula, namely:

[0087]

[0088] If the sliding end tooth collides with the next fixed end tooth, the sliding end moves in the x direction by:

[0089]

[0090] Where, the sliding end acceleration a 滑动端 The calculation formula is:

[0091]

[0092] from Figure 5 It can be seen that the relationship between the moving distance of the sliding end and the moving distance of the fixed end is:

[0093] S 滑动端 =S 固定端 +l x Where l x It is the gap between the teeth at the sliding end and the fixed end.

[0094] The distance l that the sliding end moves in the y direction during the separation process y It is the separation gap of the electromagnetic clutch sliding end and satisfies the following formula:

[0095]

[0096] Where a y is the clutch separation acceleration in the y direction, and its calculation formula is:

[0097]

[0098] Obtain the various parameters required in the formula, including the tooth gap size l between the driven end teeth and the active end teeth of the electromagnetic clutch x , the separation gap size l of the driven end teeth of the electromagnetic clutch y and the mass m of the push ring of the electromagnetic clutch 推环 .

[0099] Step d2, determining the torque upper limit value of the jitter torque according to the speed change rate of the driven end of the electromagnetic clutch, the spring force, the circumferential radius, the tooth gap size, the separation gap size and the push ring mass.

[0100] If you want to ensure that the sliding end tooth does not collide with the next fixed end tooth during the jitter control during the clutch disengagement process, the conditions that need to be met are:

[0101] t 分离 <t。

[0102] Then, the maximum torque boundary of the jitter torque can be obtained as:

[0103]

[0104] That is, the torque upper limit value of the jitter torque is determined according to the speed change rate of the driven end of the electromagnetic clutch, the spring force, the circumferential radius, the tooth gap size, the separation gap size and the push ring mass.

[0105] Further, it is determined whether the driven end and the driving end of the electromagnetic clutch are separated according to the following steps:

[0106] Step e1, obtaining the driven end speed value and the driving end speed value of the electromagnetic clutch.

[0107] Here, firstly, the driven end speed value and the driving end speed value of the electromagnetic clutch are obtained.

[0108] Step e2: if the speed difference between the driven end speed value and the driving end speed value is greater than a preset speed difference threshold, it is determined that the driven end and the driving end of the electromagnetic clutch are separated, and the electromagnetic clutch is converted from a parallel mode to a series mode.

[0109] In the embodiment of the present application, whether the electromagnetic clutch is disengaged is determined based on the speed difference between the driven end speed value and the driving end speed value. Figure 4As shown, if the speed difference is greater than the preset speed difference threshold, it is determined that the driven end and the active end of the electromagnetic clutch have been separated, the jitter torque control can be exited, and the electromagnetic clutch is converted from the parallel mode to the series mode.

[0110] Step e3: if the speed difference between the driven end speed value and the driving end speed value is less than or equal to the speed difference threshold, it is determined that the driven end and the driving end of the electromagnetic clutch are not separated and the electromagnetic clutch is still in the parallel mode.

[0111] Here, if Figure 4 As shown, if the speed difference is less than or equal to the preset speed difference threshold, it is determined that the driven end and the driving end of the electromagnetic clutch are not separated, and the electromagnetic clutch is still in the parallel mode.

[0112] The embodiment of the present application provides a control method for an electromagnetic clutch, which is applied to a series-parallel hybrid system, including: when the electromagnetic clutch of the series-parallel hybrid system is in parallel mode, if a clutch separation command request sent by a vehicle controller is received, then based on the output torque of the engine of the series-parallel hybrid system, the output torque of the generator of the series-parallel hybrid system is adjusted to clear the input shaft torque of the electromagnetic clutch; if the input shaft torque is less than the preset input shaft torque threshold, it is determined that the input shaft torque clearing is completed, and the electromagnetic coil of the electromagnetic clutch is controlled to be powered off; after the electromagnetic coil is powered off, if the driven end and the active end of the electromagnetic clutch are still not separated, then based on the speed change rate of the driven end of the electromagnetic clutch, the parameter range of the jitter torque is determined; the parameter range includes the torque direction, the torque upper limit value and the torque lower limit value of the jitter torque; based on the parameter range of the jitter torque, a target jitter torque is generated, and the output torque of the generator is adjusted according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated. In this way, the direction and upper and lower limits of the jitter torque are determined by the speed change rate of the driven end, so that the electromagnetic clutch can be stably separated.

[0113] Based on the same application concept, the embodiment of the present application also provides an electromagnetic clutch control device corresponding to the electromagnetic clutch control method provided in the above embodiment. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the electromagnetic clutch control method in the above embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0114] See also Figure 6 , Figure 6 This is a functional module diagram of a control device for an electromagnetic clutch provided in an embodiment of the present application. Figure 6 As shown, the control device 600 of the electromagnetic clutch includes:

[0115] The torque clearing module 610 is used to adjust the output torque of the generator of the series-parallel hybrid system based on the output torque of the engine of the series-parallel hybrid system to clear the input shaft torque of the electromagnetic clutch when the electromagnetic clutch of the series-parallel hybrid system is in parallel mode and a clutch release command request sent by the vehicle controller is received.

[0116] The clearing judgment module 620 is used to determine that the input shaft torque clearing is completed if the input shaft torque is less than a preset input shaft torque threshold, and control the electromagnetic coil of the electromagnetic clutch to be de-energized.

[0117] The parameter determination module 630 is used to determine the parameter range of the jitter torque based on the speed change rate of the driven end of the electromagnetic clutch if the driven end and the driving end of the electromagnetic clutch are still not separated after the electromagnetic coil is powered off; the parameter range includes the torque direction, torque upper limit value and torque lower limit value of the jitter torque.

[0118] The jitter execution module 640 is used to generate a target jitter torque based on the parameter range of the jitter torque, and adjust the output torque of the generator according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated.

[0119] Further, when the torque clearing module 610 is used to adjust the output torque of the generator of the series-parallel hybrid system based on the output torque of the engine of the series-parallel hybrid system, the torque clearing module 610 is specifically used to:

[0120] Acquire a first output torque of the engine, and calculate a second reverse output torque required to offset the first output torque;

[0121] The first output torque of the engine is kept unchanged, and the output torque of the generator is gradually increased in the reverse direction from zero torque until the output torque of the generator reaches the second output torque.

[0122] Furthermore, the parameter determination module 630 is further configured to determine the speed change rate of the driven end of the electromagnetic clutch according to the following steps:

[0123] Acquire a first speed value of the engine when receiving a clutch release command request sent by the vehicle controller, a second speed value of the engine when the input shaft torque clearing is completed, and a target duration from receiving the clutch release command request to completing the input shaft torque clearing;

[0124] The speed change rate of the driven end of the electromagnetic clutch is obtained by subtracting the second speed value from the first speed value and dividing the resultant difference by the target duration.

[0125] Furthermore, the torque direction of the jitter torque is the same as the direction of the speed change rate of the driven end of the electromagnetic clutch.

[0126] Furthermore, the parameter determination module 630 is further configured to determine the torque lower limit value of the jitter torque according to the following steps:

[0127] Obtaining the spring force of the return spring of the electromagnetic clutch, the circumferential radius of the driven end of the electromagnetic clutch, the friction coefficient of the tooth side contact surface of the electromagnetic clutch, and the moment of inertia of all components on the active end side of the electromagnetic clutch;

[0128] The lower limit value of the jitter torque is determined according to the rotation speed change rate of the driven end of the electromagnetic clutch, the spring force, the circumferential radius, the friction coefficient and the moment of inertia.

[0129] Furthermore, the parameter determination module 630 is further configured to determine the torque upper limit value of the jitter torque according to the following steps:

[0130] Obtaining the tooth gap size between the driven end teeth and the driving end teeth of the electromagnetic clutch, the separation gap size of the driven end teeth of the electromagnetic clutch, and the mass of the push ring of the electromagnetic clutch;

[0131] The torque upper limit value of the jitter torque is determined according to the speed change rate of the driven end of the electromagnetic clutch, the spring force, the circumferential radius, the tooth gap size, the separation gap size and the push ring mass.

[0132] Furthermore, the parameter determination module 630 is further configured to determine whether the driven end and the driving end of the electromagnetic clutch are separated according to the following steps:

[0133] Obtaining a driven end speed value and a driving end speed value of the electromagnetic clutch;

[0134] If the speed difference between the driven end speed value and the driving end speed value is greater than a preset speed difference threshold, it is determined that the driven end and the driving end of the electromagnetic clutch are separated, and the electromagnetic clutch is converted from a parallel mode to a series mode;

[0135] If the speed difference between the driven end speed value and the driving end speed value is less than or equal to the speed difference threshold, it is determined that the driven end and the driving end of the electromagnetic clutch are not separated and the electromagnetic clutch is still in the parallel mode.

[0136] The embodiment of the present application provides a control device for an electromagnetic clutch, which is applied to a series-parallel hybrid power system, and the device includes: a torque clearing module, which is used to adjust the output torque of the generator of the series-parallel hybrid power system based on the output torque of the engine of the series-parallel hybrid power system to clear the input shaft torque of the electromagnetic clutch if a clutch separation command request sent by a vehicle controller is received when the electromagnetic clutch of the series-parallel hybrid power system is in parallel mode; a clearing judgment module, which is used to determine that the input shaft torque clearing is completed if the input shaft torque is less than a preset input shaft torque threshold, and control the electromagnetic coil of the electromagnetic clutch to be powered off; a parameter determination module, which is used to determine the parameter range of the jitter torque based on the speed change rate of the driven end of the electromagnetic clutch if the driven end and the active end of the electromagnetic clutch are still not separated after the electromagnetic coil is powered off; the parameter range includes the torque direction, torque upper limit value and torque lower limit value of the jitter torque; a jitter execution module, which is used to generate a target jitter torque based on the parameter range of the jitter torque, and adjust the output torque of the generator according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated. In this way, the direction and upper and lower limits of the jitter torque are determined by the speed change rate of the driven end, so that the electromagnetic clutch can be stably disengaged.

[0137] Based on the same application idea, please refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 7 As shown, the electronic device 700 includes a processor 710 , a memory 720 and a bus 730 .

[0138] The memory 720 stores machine-readable instructions executable by the processor 710. When the electronic device 700 is running, the processor 710 communicates with the memory 720 through the bus 730. The machine-readable instructions are executed by the processor 710 to execute the steps of the electromagnetic clutch control method provided in the above embodiment.

[0139] Based on the same application concept, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the electromagnetic clutch control method provided in the above embodiment are executed.

[0140] In the embodiment of the present application, the computer program can also execute other machine-readable instructions when run by the processor to execute other methods described in the embodiment. For the specific execution method steps and principles, please refer to the description of the embodiment, which will not be repeated here.

[0141] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0142] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0143] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0144] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0145] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0146] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application. They should all be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A control method for an electromagnetic clutch, characterized in that: Applied to a series-parallel hybrid power system, the method comprises: When the electromagnetic clutch of the series-parallel hybrid system is in the parallel mode, if a clutch release command request sent by the vehicle controller is received, the output torque of the generator of the series-parallel hybrid system is adjusted based on the output torque of the engine of the series-parallel hybrid system to clear the input shaft torque of the electromagnetic clutch; If the input shaft torque is less than a preset input shaft torque threshold, it is determined that the input shaft torque clearance is completed, and the electromagnetic coil of the electromagnetic clutch is controlled to be de-energized; After the electromagnetic coil is powered off, if the driven end and the driving end of the electromagnetic clutch are still not separated, a parameter range of the jitter torque is determined based on the speed change rate of the driven end of the electromagnetic clutch; the parameter range includes the torque direction, the torque upper limit value and the torque lower limit value of the jitter torque; Based on the parameter range of the jitter torque, a target jitter torque is generated, and the output torque of the generator is adjusted according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated.

2. The control method of the electromagnetic clutch according to claim 1, characterized in that: The adjusting the output torque of the generator of the series-parallel hybrid system based on the output torque of the engine of the series-parallel hybrid system comprises: Acquire a first output torque of the engine, and calculate a second reverse output torque required to offset the first output torque; The first output torque of the engine is kept unchanged, and the output torque of the generator is gradually increased in the reverse direction from zero torque until the output torque of the generator reaches the second output torque.

3. The control method of the electromagnetic clutch according to claim 1, characterized in that: The speed change rate of the driven end of the electromagnetic clutch is determined according to the following steps: Acquire a first speed value of the engine when receiving a clutch release command request sent by the vehicle controller, a second speed value of the engine when the input shaft torque clearing is completed, and a target duration from receiving the clutch release command request to completing the input shaft torque clearing; The speed change rate of the driven end of the electromagnetic clutch is obtained by subtracting the second speed value from the first speed value and dividing the resultant difference by the target duration.

4. The control method of the electromagnetic clutch according to claim 1, characterized in that: The torque direction of the jitter torque is the same as the direction of the rotation speed change rate of the driven end of the electromagnetic clutch.

5. The control method of the electromagnetic clutch according to claim 1, characterized in that: The torque lower limit value of the jitter torque is determined according to the following steps: Obtaining the spring force of the return spring of the electromagnetic clutch, the circumferential radius of the driven end of the electromagnetic clutch, the friction coefficient of the tooth side contact surface of the electromagnetic clutch, and the moment of inertia of all components on the active end side of the electromagnetic clutch; The lower limit value of the jitter torque is determined according to the rotation speed change rate of the driven end of the electromagnetic clutch, the spring force, the circumferential radius, the friction coefficient and the moment of inertia.

6. The control method of the electromagnetic clutch according to claim 5, characterized in that: The torque upper limit value of the jitter torque is determined according to the following steps: Obtaining the tooth gap size between the driven end teeth and the driving end teeth of the electromagnetic clutch, the separation gap size of the driven end teeth of the electromagnetic clutch, and the mass of the push ring of the electromagnetic clutch; The torque upper limit value of the jitter torque is determined according to the speed change rate of the driven end of the electromagnetic clutch, the spring force, the circumferential radius, the tooth gap size, the separation gap size and the push ring mass.

7. The control method of the electromagnetic clutch according to claim 1, characterized in that: Determine whether the driven end and the driving end of the electromagnetic clutch are separated according to the following steps: Obtaining a driven end speed value and a driving end speed value of the electromagnetic clutch; If the speed difference between the driven end speed value and the driving end speed value is greater than a preset speed difference threshold, it is determined that the driven end and the driving end of the electromagnetic clutch are separated, and the electromagnetic clutch is converted from a parallel mode to a series mode; If the speed difference between the driven end speed value and the driving end speed value is less than or equal to the speed difference threshold, it is determined that the driven end and the driving end of the electromagnetic clutch are not separated and the electromagnetic clutch is still in the parallel mode.

8. A control device for an electromagnetic clutch, characterized in that: Applied to a series-parallel hybrid power system, the control device of the electromagnetic clutch comprises: a torque clearing module, configured to adjust the output torque of the generator of the series-parallel hybrid system based on the output torque of the engine of the series-parallel hybrid system to clear the input shaft torque of the electromagnetic clutch when the electromagnetic clutch of the series-parallel hybrid system is in the parallel mode and receives a clutch release command request sent by the vehicle controller; a clearing judgment module, for determining that the input shaft torque clearing is completed if the input shaft torque is less than a preset input shaft torque threshold, and controlling the electromagnetic coil of the electromagnetic clutch to be de-energized; A parameter determination module, configured to determine a parameter range of the jitter torque based on a speed change rate of the driven end of the electromagnetic clutch if the driven end and the driving end of the electromagnetic clutch are still not separated after the electromagnetic coil is powered off; the parameter range includes a torque direction, an upper torque limit value, and a lower torque limit value of the jitter torque; The jitter execution module is used to generate a target jitter torque based on the parameter range of the jitter torque, and adjust the output torque of the generator according to the target jitter torque until the driven end and the active end of the electromagnetic clutch are separated.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method of the electromagnetic clutch as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the electromagnetic clutch control method according to any one of claims 1 to 7 are executed.

Images