Hybrid power transmission electromagnetic jaw clutch separation control method and device

Abstract

The present invention discloses a hybrid-type special transmission electromagnetic tooth clutch separation control method and device, the method comprising: in parallel mode, after the vehicle controller HCU determines that the vehicle meets the electromagnetic clutch separation conditions, sending instructions to the engine electronic control unit and the dual-motor controller MCU, sending a separation instruction to the clutch control CCU, and sending instructions to the dual-motor controller MCU at the same time; completing the separation action; monitoring the speeds at both ends of the clutch to determine whether the clutch is separated; the hybrid-type special transmission electromagnetic tooth clutch separation control method provided by the present invention does not require the intervention of additional actuators, and controls the jitter torque control of the generator P1 through software strategies to ensure stable separation of the electromagnetic clutch; does not require additional sensors, and monitors the changes in the speed difference between the front and rear ends of the tooth clutch through software strategies to determine whether the tooth clutch has been disengaged, providing an accurate basis for mode switching.

Description

Technical Field

[0001] The present invention relates to the field of hybrid power, and in particular to a method and device for controlling the separation of an electromagnetic tooth clutch in a hybrid power transmission. Background Art

[0002] Currently, more and more hybrid-specific transmissions are adopting a dual first generator + P3 series-parallel architecture, which can take into account the fuel-saving effect of the vehicle under various working conditions; the series mode is adopted when driving at low speeds. At this time, the engine and the wheels are decoupled, and the engine can operate stably in the high-efficiency range. The engine and the first generator work stably to generate electricity, and the motor P3 is controlled by the inverter to drive the vehicle. The overall efficiency of the power system is higher than that of traditional fuel vehicles; the parallel mode is adopted when the vehicle is driving at medium and high speeds. At this time, the engine enters the high-efficiency range and can directly drive the wheel end to output power, which can reduce energy conversion losses compared with the series mode. For hybrid-powered transmissions with a series-parallel structure, there are many forms of clutch structures. With the improvement of electrification and control accuracy, electromagnetic clutches are increasingly used in hybrid-powered transmissions due to their simple mechanical structure and wide environmental adaptability. However, the electromagnetic tooth clutch has very high requirements for the control system. In particular, during the separation process, it is necessary to ensure that the electromagnetic clutch transmits a torque less than a certain value before the tooth clutch can overcome the friction force under the action of the return spring force to complete the separation. Considering the torque fluctuation factor of the power system, the condition that the tooth clutch transmits a torque less than a certain value is difficult to achieve stably. If the tooth clutch occasionally separates when switching between parallel and series modes, it will cause a fault in the software judgment, making it impossible for the vehicle to drive normally. Therefore, the separation process of the tooth clutch needs to be finely controlled to ensure the stable disengagement of the tooth clutch. Summary of the Invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a hybrid power transmission electromagnetic tooth clutch separation control method, which can finely control the separation process of the tooth clutch and ensure stable disengagement of the tooth clutch.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a method for controlling the release of an electromagnetic dog clutch in a hybrid transmission, comprising:

[0008] Based on the engine's torque accuracy, calibrate the first generator's jitter torque value and frequency, and the jitter torque value and period in the torque jitter command on the vehicle; calibrate the separation speed threshold and separation time threshold;

[0009] The vehicle controller determines the vehicle status and sends a 0N·m command to the engine electronic control unit and dual motor controller based on the judgment result;

[0010] The vehicle controller determines the torque status of the engine and the first generator, and sends instructions to the clutch control and dual-motor controller respectively based on the determination results;

[0011] After receiving the vehicle controller command, the clutch control controls the electromagnetic coil output current to 0; after receiving the first generator torque jitter command, the dual-motor controller controls the first generator to change according to the jitter torque value to complete the separation action;

[0012] The vehicle controller determines whether the clutch is disengaged.

[0013] As a preferred solution of the hybrid power transmission electromagnetic jaw clutch separation control method of the present invention, wherein:

[0014] The vehicle status determination includes: the vehicle controller determining whether the vehicle is in parallel mode; if so, the vehicle controller further determining whether the vehicle meets the electromagnetic clutch disengagement condition; if so, sending a 0 N·m command to the engine electronic control unit and the dual motor controller.

[0015] As a preferred solution of the hybrid power transmission electromagnetic jaw clutch separation control method of the present invention, wherein:

[0016] The sending of the 0N·m instruction includes: the vehicle controller sends the 0N·m instruction to the engine electronic control unit to control the torque at the flywheel end of the engine to 0, and controls the first generator to change from a speed mode to a torque control mode; the vehicle controller simultaneously sends the 0N·m instruction to the dual-motor controller to control the first generator so that the motor output end is 0.

[0017] As a preferred solution of the hybrid power transmission electromagnetic jaw clutch separation control method of the present invention, wherein:

[0018] The judgment of the torque state includes: the vehicle controller judges the torque state of the engine and the first generator. When the engine and the first generator are both in 0 torque control, the vehicle controller sends an electromagnetic clutch separation command to the clutch control, and at the same time sends a first generator torque jitter command to the dual-motor controller.

[0019] As a preferred solution of the hybrid power transmission electromagnetic jaw clutch separation control method of the present invention, wherein:

[0020] The separation action includes: the first generator changes according to the jitter torque value, causing the torque transmitted by the front end of the clutch to oscillate in a short time, thereby causing the torque to pass through zero, and the tooth clutch completes the separation action under the action of the return spring force.

[0021] As a preferred solution of the hybrid power transmission electromagnetic jaw clutch separation control method of the present invention, wherein:

[0022] The determination of whether the clutch is disengaged includes: calculating a first speed and a second speed, wherein the first speed of the clutch close to the front end face of the engine side is calculated by dividing the speed of the generator of the dual-motor controller by the gear transmission ratio from the generator to the clutch shaft; the second speed of the clutch away from the rear end face of the engine side is calculated by dividing the speed of the driving motor of the dual-motor controller by the gear transmission ratio from the driving motor to the clutch shaft.

[0023] As a preferred solution of the hybrid power transmission electromagnetic jaw clutch separation control method of the present invention, wherein:

[0024] The judgment on whether the clutch is disengaged also includes: calculating the speed difference between the front and rear ends of the clutch, the speed difference between the front and rear ends of the clutch being the absolute value of the difference between the first speed and the second speed; the vehicle controller monitors the speed difference between the front and rear ends of the clutch in real time, and when it is monitored that the speed difference between the front and rear ends of the clutch is greater than the separation speed threshold, starts timing, and when the timing time reaches the separation time threshold, determines whether the speed difference during the timing period has been greater than the separation speed threshold. If so, it is determined that the clutch is disengaged.

[0025] In a second aspect, an embodiment of the present invention provides a hybrid-specific transmission electromagnetic dog clutch release control system, characterized by comprising:

[0026] The calibration module is used to calibrate the first generator jitter torque value and frequency, the jitter torque value and period in the torque jitter instruction on the entire vehicle according to the torque accuracy of the engine; and calibrate the separation speed threshold and the separation time threshold.

[0027] The control module is configured to determine the vehicle state through the vehicle controller and send a 0 N·m command to the engine electronic control unit and the dual-motor controller based on the determination result; further determine the torque state of the engine and the first generator through the vehicle controller and send commands to the clutch control and the dual-motor controller based on the determination result; the clutch control controls the electromagnetic coil output current to 0 upon receiving the vehicle controller command; and the dual-motor controller controls the first generator to change according to the jitter torque value upon receiving the first generator torque jitter command to complete the disengagement action;

[0028] The judgment module is used to judge whether the clutch is disengaged through the vehicle controller.

[0029] In a third aspect, an embodiment of the present invention provides a computing device, including:

[0030] A memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the hybrid power transmission electromagnetic tooth clutch separation control method according to any embodiment of the present invention is implemented.

[0031] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the hybrid-specific transmission electromagnetic tooth clutch separation control method as described in any embodiment of the present invention.

[0032] The beneficial effects of the present invention are as follows: the hybrid-specific transmission electromagnetic tooth clutch separation control method provided by the present invention does not require the intervention of additional actuators, and controls the jitter torque control of the first generator through software strategies to ensure stable separation of the electromagnetic clutch; without the need for additional sensors, the software strategy monitors the changes in the speed difference between the front and rear ends of the tooth clutch to determine whether the tooth clutch has been disengaged, providing an accurate basis for mode switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] in:

[0035] Figure 1 This is an overall flow chart of a hybrid-specific transmission electromagnetic dog clutch separation control method according to the first embodiment of the present invention;

[0036] Figure 2This is a sawtooth waveform diagram of torque jitter when the dog clutch is disengaged in a hybrid power transmission electromagnetic dog clutch disengagement control method according to the first embodiment of the present invention;

[0037] Figure 3 A topology diagram of a series-parallel hybrid transmission in a hybrid transmission electromagnetic dog clutch separation control method according to the first embodiment of the present invention;

[0038] Figure 4 An exploded diagram of the electromagnetic dog clutch in a hybrid power transmission electromagnetic dog clutch separation control method according to the first embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of actual data of the electromagnetic dog clutch separation process in a simulation experiment of a hybrid-specific transmission electromagnetic dog clutch separation control method according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0040] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0043] The present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0044] In the description of the present invention, it should be noted that the terms "upper, lower, inner, and outer" and other references to orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In this disclosure, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections. They may also refer to mechanical, electrical, or direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure.

[0046] Example 1

[0047] Reference Figure 1-4 , which is the first embodiment of the present invention, provides a method for controlling the separation of an electromagnetic dog clutch in a hybrid power transmission, comprising:

[0048] S1: In parallel mode, after the vehicle controller HCU determines that the vehicle meets the electromagnetic clutch disengagement conditions, it sends a 0N·m command to the engine electronic control unit and the dual-motor controller MCU;

[0049] Specifically, the sending of the 0 N·m instruction includes: the vehicle controller HCU sends the 0 N·m instruction to the engine electronic control unit to control the engine flywheel end torque to 0, and the generator P1 changes from the speed mode to the torque control mode.

[0050] Furthermore, the vehicle controller HCU simultaneously sends a 0 N·m command to the dual-motor controller MCU to control the generator P1, and the motor output is 0.

[0051] S2: The vehicle controller HCU sends an electromagnetic clutch disengagement command to the clutch control CCU, and simultaneously sends a generator P1 torque jitter command to the dual-motor controller MCU;

[0052] Specifically, the vehicle controller HCU sends the electromagnetic clutch separation command and the generator P1 torque jitter command, including: when the engine and the generator P1 are both in 0 torque control, the vehicle controller HCU sends an electromagnetic clutch separation command to the clutch control CCU, and at the same time sends the generator P1 torque jitter command to the dual-motor controller MCU.

[0053] The set shaking torque value and period are related to the torque accuracy of the engine. The shaking torque value and frequency of the generator P1 need to be calibrated on the entire vehicle.

[0054] S3: After receiving the command from the vehicle controller HCU, the clutch control CCU controls the electromagnetic coil output current to 0. After receiving the torque jitter command from the generator P1, the dual-motor controller MCU controls the generator P1 to change according to the set jitter torque, completing the separation action.

[0055] Specifically, the separation action includes: the generator P1 changes according to the set jitter torque, so that the torque transmitted by the front end of the clutch oscillates in a short time. Once the torque passes the "zero point", the tooth clutch can quickly complete the separation action under the action of the return spring force.

[0056] It should be noted that the electromagnetic clutch can be effectively disengaged through the jitter torque control of the P1 motor without the intervention of additional actuators.

[0057] S4: Monitor the speed at both ends of the clutch to determine whether the clutch is disengaged.

[0058] Specifically, the speed monitoring of both ends of the clutch includes: calculating the speed n1 of the front end surface of the clutch close to the engine, which is obtained by dividing the speed of the generator of the dual-motor controller MCU by the gear transmission ratio from the generator to the clutch shaft.

[0059] Furthermore, the speed monitoring of both ends of the clutch also includes: calculating the speed n2 of the rear end face of the clutch away from the engine side, which is obtained by dividing the speed of the dual-motor controller MCU driving the motor by the gear transmission ratio from the driving motor to the clutch shaft.

[0060] The vehicle controller HCU determines whether the clutch is disengaged by monitoring the absolute value of the difference between n1 and n2, that is, the speed difference between the front and rear ends of the clutch.

[0061] Specifically, determining whether the clutch is disengaged includes: after the vehicle controller HCU issues a disengagement command and a torque jitter command, when the vehicle controller HCU monitors that the absolute value of the difference between n1 and n2 is greater than a set value and remains for a period of time, during which the speed difference is greater than a threshold, it is determined that the clutch is disengaged.

[0062] It should be noted that without the need for additional sensors, the system monitors the speed difference between the front and rear ends of the dog clutch to determine whether the dog clutch has disengaged, providing an accurate basis for mode switching. This solution ensures stable disengagement of the electromagnetic dog clutch. However, without increasing the jitter torque during the disengagement process, it would be difficult to ensure rapid disengagement of the dog clutch, resulting in hybrid mode switching failure.

[0063] Example 2

[0064] Reference Figure 5 , which is the second embodiment of the present invention. In order to verify and illustrate the technical effect achieved by this method, this embodiment uses this method to conduct simulation experiments to verify the actual effect of this method.

[0065] In parallel mode (HEVWkMod is Parallel drive ICE), the vehicle speed (VehSpdAvgDrvn_ABS) drops to a certain threshold (56.3KM / H in this example), and the vehicle controller HCU requests to enter series mode (Series drive). At this time, the engine and generator P1+P3 both unload torque to approximately 0N·M. At the same time, the vehicle controller HCU issues a clutch release command (ClutActReq is a clutch disconnect command), and the ACU controls the clutch solenoid valve current value to 0 (ACUCotrlMod enters Open from HoldMode). The generator P1 actively applies a zero-crossing jitter torque from -10.5N·M to 5.4NM, and the clutch is released from self-locking and can be separated automatically. It is determined that the speed difference between the two ends of the clutch is greater than the threshold (52rpm in this example) for 0.15S. The vehicle successfully enters series mode (HEVWkMod is Series drive) for driving.

[0066] It can be seen from the experimental data that the method proposed in the present invention can ensure that the electromagnetic clutch is completely separated, ensuring that the vehicle can smoothly switch from parallel mode to series mode, and avoiding the risk of failure during mode switching that may cause the vehicle to be unable to drive normally.

[0067] It should be appreciated that embodiments of the present invention can be implemented or practiced by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The methods can be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner, according to the methods and figures described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. In addition, the program can be run on a programmed application-specific integrated circuit for this purpose.

[0068] Furthermore, the operations of the processes described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by the context. The processes described herein (or variations and / or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) that is executed collectively on one or more processors, by hardware, or a combination thereof. The computer program includes a plurality of instructions that can be executed by one or more processors.

[0069] Furthermore, the methods can be implemented in any type of computing platform operably connected to a suitable computer, including but not limited to a personal computer, minicomputer, mainframe, workstation, network or distributed computing environment, standalone or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Aspects of the present invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard drive, optical read and / or write storage medium, RAM, ROM, etc., such that it can be read by a programmable computer, and when the storage medium or device is read by the computer, can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted over wired or wireless networks. When such media includes instructions or programs for implementing the steps described above in conjunction with a microprocessor or other data processor, the invention described herein includes these and other different types of non-transitory computer-readable storage media. The invention also includes the computer itself, when programmed according to the methods and techniques described herein. The computer program can be applied to input data to perform the functions described herein, thereby converting the input data to generate output data that is stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In a preferred embodiment of the present invention, the converted data represents a physical and tangible object, including a specific visual depiction of the physical and tangible object produced on a display.

[0070] As used in this application, the terms "component", "module", "system" and the like are intended to refer to a computer-related entity, which can be hardware, firmware, a combination of hardware and software, software, or software in operation. For example, a component can be, but is not limited to: a process running on a processor, a processor, an object, an executable file, a thread in execution, a program and / or a computer. As an example, both an application running on a computing device and the computing device can be a component. One or more components can exist in an executing process and / or thread, and a component can be located in a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures thereon. These components can communicate in the form of local and / or remote processes, such as based on signals having one or more data packets (e.g., data from a component that interacts with another component in a local system, a distributed system, and / or interacts with other systems in the form of signals over a network such as the Internet).

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A hybrid power transmission electromagnetic jaw clutch separation control method, characterized in that: include: Based on the torque accuracy of the engine, calibrate the jitter torque value and frequency of the first generator, and the jitter torque value and period in the torque jitter command on the vehicle; Calibrate separation speed threshold and separation time threshold; The vehicle controller determines the vehicle status and sends a 0N·m command to the engine electronic control unit and dual motor controller based on the judgment result; The vehicle controller determines the torque status of the engine and the first generator, and sends instructions to the clutch control and dual-motor controller respectively based on the determination results; After receiving the vehicle controller command, the clutch control controls the electromagnetic coil output current to 0; after receiving the first generator torque jitter command, the dual-motor controller controls the first generator to change according to the jitter torque value to complete the separation action; The vehicle controller determines whether the clutch is disengaged; The vehicle state determination includes: the vehicle controller determining whether the vehicle is in parallel mode; if so, the vehicle controller further determining whether the vehicle meets the electromagnetic clutch disengagement condition; if so, sending a 0 N·m command to the engine electronic control unit and the dual motor controller; The sending of the 0 N·m instruction includes: the vehicle controller sending the 0 N·m instruction to the engine electronic control unit to control the engine flywheel end torque to 0, and controlling the first generator to change from a speed control mode to a torque control mode; the vehicle controller simultaneously sending the 0 N·m instruction to the dual-motor controller to control the first generator so that the motor output end is 0; The determining of the torque states of the engine and the first generator includes: when the engine and the first generator are both in zero torque control, the vehicle controller sends an electromagnetic clutch disengagement command to the clutch controller, and simultaneously sends a first generator torque jitter command to the dual-motor controller; The completion of the separation action includes: the first generator changes according to the jitter torque value, causing the torque transmitted by the front end of the clutch to oscillate in a short period of time, thereby causing the torque to pass through zero, and the dog clutch completes the separation action under the action of the return spring force; The determining whether the clutch is disengaged includes calculating a first speed and a second speed, wherein the first speed of the clutch on the front end face close to the engine is calculated by dividing the speed of the generator of the dual-motor controller by the gear transmission speed ratio from the generator to the clutch shaft; and the second speed of the clutch on the rear end face away from the engine is calculated by dividing the speed of the drive motor of the dual-motor controller by the gear transmission speed ratio from the drive motor to the clutch shaft. Calculate the speed difference between the front and rear ends of the clutch, which is the absolute value of the difference between the first speed and the second speed; the vehicle controller monitors the speed difference between the front and rear ends of the clutch in real time, and starts timing when it is monitored that the speed difference between the front and rear ends of the clutch is greater than the separation speed threshold. When the timing time reaches the separation time threshold, determine whether the speed difference has been greater than the separation speed threshold during the timing period. If so, it is determined that the clutch has been disengaged.

2. A hybrid power transmission electromagnetic jaw clutch release control system, using the method according to claim 1, characterized in that: include: A calibration module, configured to calibrate the jitter torque value and frequency of the first generator, and the jitter torque value and period in the torque jitter instruction on the vehicle according to the torque accuracy of the engine; Calibrate separation speed threshold and separation time threshold; The control module is configured to determine the vehicle state through the vehicle controller and send a 0 N·m command to the engine electronic control unit and the dual-motor controller based on the determination result; further determine the torque state of the engine and the first generator through the vehicle controller and send commands to the clutch control and the dual-motor controller based on the determination result; the clutch control controls the electromagnetic coil output current to 0 upon receiving the vehicle controller command; and the dual-motor controller controls the first generator to change according to the jitter torque value upon receiving the first generator torque jitter command to complete the disengagement action; The judgment module is used to judge whether the clutch is disengaged through the vehicle controller.

3. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the hybrid power transmission electromagnetic dog clutch separation control method according to claim 1 are implemented.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the hybrid power transmission electromagnetic dog clutch separation control method according to claim 1 are implemented.

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