Hybrid clutch control method and control system

Abstract

The present invention proposes a hybrid clutch control method and control system. The method operates on a vehicle controller and includes: obtaining parameters that affect the execution state of the hybrid clutch, including the current power battery pack charge, the current clutch state, the engine torque requirement, the engine speed, and the motor speed; setting a threshold value corresponding to each parameter, and determining the clutch execution state through multi-level judgment of the relationship between each parameter and the corresponding threshold value. Based on this method, a hybrid clutch control system is also proposed. The present invention designs a multi-stage partial clutch closure state when the clutch is connected, effectively improving the smoothness of the clutch connection. When the current power battery pack charge is less than a certain value, the system maintains the clutch closed state, which can effectively reduce the number of clutch on and off cycles and increase the service life of the clutch; the design of a multi-stage partial clutch closure state when the clutch is connected effectively improves the smoothness of the clutch connection.

Description

Technical Field

[0001] The present invention belongs to the technical field of hybrid clutch control, and in particular relates to a hybrid clutch control method and control system. Background Art

[0002] For the P2 form of single-motor hybrid system, the short service life of the clutch between the engine and the motor is an industry-wide technical problem. The P2 form of single-motor hybrid system refers to a system with a clutch between the engine and the motor.

[0003] In a P2-type single-motor hybrid system, the clutch between the engine and motor often needs to be frequently connected and disconnected to meet the needs of various vehicle operating conditions, varying battery charge states, and varying driving habits. This significantly reduces the service life of traditional clutches. Even specialized clutches improved with various advanced technologies and materials still cannot fully meet these requirements. How to reduce the number of clutch connections and disconnections to extend clutch life is a technical problem that needs to be solved. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention proposes a hybrid clutch control method and control system, which designs a multi-stage partial clutch closing state when the clutch is connected, effectively improving the smoothness of the clutch connection.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A hybrid clutch control method, running on a vehicle controller, includes the following steps:

[0007] Obtaining parameters that affect the execution state of the hybrid clutch, the parameters including the current power of the power battery pack, the current state of the clutch, the engine required torque, the engine speed, and the motor speed;

[0008] A threshold value corresponding to each parameter is set, and the clutch execution state is obtained through multi-level judgment of the relationship between each parameter and the corresponding threshold value.

[0009] Furthermore, the process of setting the threshold value corresponding to each parameter includes:

[0010] Setting a first power threshold and a second power threshold of the current power of the battery pack;

[0011] Setting a preset torque threshold for engine demand torque;

[0012] A preset speed difference threshold is set for the speed difference between the engine and the motor.

[0013] Furthermore, the process of determining the relationship between each parameter and the corresponding threshold value through multiple levels includes:

[0014] Determine whether the current charge of the power battery pack is less than a first charge threshold, and if so, determine the current state of the clutch; if not, determine the relationship between the engine demand torque and a preset torque threshold;

[0015] If the clutch is not currently closed, the relationship between the speed difference between the engine and the motor and a preset speed difference threshold is determined; if the clutch is currently closed, the current state of the clutch is maintained;

[0016] If the engine demand torque is greater than the preset torque threshold, continue to judge the current state of the clutch; if the engine demand torque is not greater than the preset torque threshold, judge the relationship between the current power of the power battery pack and the second power threshold.

[0017] Furthermore, the process of obtaining the clutch execution state by multi-level determination of the relationship between each parameter and the corresponding threshold value includes:

[0018] When it is determined that the current power level of the power battery pack is less than a preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is less than a preset speed difference threshold, the hybrid system is controlled to partially close the clutch first and then fully close the clutch.

[0019] Furthermore, the process of obtaining the clutch execution state by multi-level determination of the relationship between each parameter and the corresponding threshold value also includes:

[0020] When it is determined that the current power level of the power battery pack is less than a preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is not less than the preset speed difference threshold, the hybrid system is controlled to first enter the engine speed following subroutine until the speed difference between the engine and the motor is less than the preset speed difference threshold, and then the hybrid system is controlled to partially close the clutch first, and then completely close the clutch.

[0021] Furthermore, the process of obtaining the clutch execution state by multi-level determination of the relationship between each parameter and the corresponding threshold value also includes:

[0022] When it is determined that the current power of the power battery pack is not less than the preset first power threshold and the engine demand torque is greater than the preset torque threshold, the current state of the clutch is determined; if the current state of the clutch is closed, the process ends; if the current state of the clutch is not closed, it is determined whether the speed difference between the engine and the motor is less than the preset speed difference threshold. If so, the hybrid system is controlled to partially close the clutch first, and then fully close the clutch; if not, the hybrid system is controlled to first enter the engine speed following subroutine until the speed difference between the engine and the motor is less than the preset speed difference threshold, and then the hybrid system is controlled to partially close the clutch first, and then fully close the clutch.

[0023] Furthermore, the process of obtaining the clutch execution state through multi-level judgment of the relationship between each parameter and the corresponding threshold also includes: when it is judged that the current power of the power battery pack is not less than the preset first power threshold and the engine required torque is not greater than the preset torque threshold, then it is judged whether the current power of the power battery pack is greater than the second power threshold. If it is greater than the second power threshold, the clutch is disconnected with a delay; if it is not greater than the second power threshold, the current state of the clutch is maintained.

[0024] Furthermore, the second power threshold is smaller than the first power threshold.

[0025] The present invention also proposes a hybrid clutch control system, comprising an acquisition module and a judgment module;

[0026] The acquisition module is used to acquire parameters that affect the execution state of the hybrid clutch, the parameters including the current power of the power battery pack, the current state of the clutch, the engine required torque, the engine speed, and the motor speed;

[0027] The judgment module is used to set a threshold value corresponding to each parameter, and obtain the clutch execution state through multi-level judgment of the relationship between each parameter and the corresponding threshold value.

[0028] Furthermore, the process of determining the relationship between each parameter and the corresponding threshold value through multiple levels in the determination module includes:

[0029] Determine whether the current charge of the power battery pack is less than a first charge threshold, and if so, determine the current state of the clutch; if not, determine the relationship between the engine demand torque and a preset torque threshold;

[0030] If the clutch is not currently engaged, the relationship between the speed difference between the engine and the motor and a preset speed difference threshold is determined; if the clutch is currently engaged, the current state of the clutch is maintained;

[0031] If the engine demand torque is greater than the preset torque threshold, continue to judge the current state of the clutch; if the engine demand torque is not greater than the preset torque threshold, judge the relationship between the current power of the power battery pack and the second power threshold.

[0032] The effects provided in the summary of the invention are only the effects of the embodiments, not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

[0033] The present invention proposes a hybrid clutch control method and control system. The method, which operates on a vehicle controller, includes the following steps: obtaining parameters that affect the hybrid clutch's execution state, including the current battery pack charge, the current clutch state, the engine's required torque, the engine speed, and the electric motor speed; setting thresholds corresponding to each parameter, and determining the clutch's execution state through a multi-stage determination of the relationship between each parameter and the corresponding threshold. The multi-stage determination of the relationship between each parameter and the corresponding threshold includes: determining whether the current battery pack charge is less than a first charge threshold; if so, determining the current clutch state; if not, determining the relationship between the engine's required torque and a preset torque threshold; if the clutch is not engaged, determining the relationship between the engine and electric motor speed difference and a preset speed difference threshold; if the clutch is engaged, maintaining the current clutch state; if the engine's required torque is greater than the preset torque threshold, continuing to determine the current clutch state; and if the engine's required torque is not greater than the preset torque threshold, determining the relationship between the current battery pack charge and a second charge threshold. Based on the hybrid clutch control method, a hybrid clutch control system is also proposed. The present invention designs a multi-stage partial clutch engagement state during clutch engagement, effectively improving clutch engagement smoothness.

[0034] When the current power level of the power battery pack is less than a certain value, the system of the present invention keeps the clutch in a closed state, which can effectively reduce the number of times the clutch is switched on and off and increase the service life of the clutch.

[0035] The present invention designs a delay before disconnecting the clutch, for example, a delay of 5 seconds, and then disconnects the clutch, which effectively avoids the clutch connection and disconnection action caused by the driver's rapid increase or decrease of the throttle, thereby improving the service life of the clutch.

[0036] The present invention designs an engine speed following strategy. Before the clutch closes, the engine fuel injection amount is increased or decreased so that the speed difference between the engine and the motor is less than a certain value. This improves the smoothness of the clutch connection, reduces the impact force of the clutch connection, and increases the service life of the clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] like Figure 1 This is a flow chart of a hybrid clutch control method proposed in Example 1 of the present invention;

[0038] like Figure 2 This is a schematic diagram of a hybrid clutch control flow proposed in Example 1 of the present invention;

[0039] like Figure 3 This is a schematic diagram of a hybrid clutch control system proposed in Example 2 of the present invention. DETAILED DESCRIPTION

[0040] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits descriptions of well-known components and processing technologies and processes to avoid unnecessary limitations on the present invention.

[0041] Example 1

[0042] Embodiment 1 of the present invention proposes a hybrid clutch control method applicable to a P2-type single-motor hybrid electric vehicle, wherein the P2 type is a clutch between the engine and the motor.

[0043] Embodiment 1 of the present invention proposes a hybrid clutch control method, the implementation process of which includes:

[0044] Obtain parameters that affect the hybrid clutch execution state, including the current power battery pack charge, the current clutch state, the engine's required torque, the engine speed, and the motor speed;

[0045] A threshold value corresponding to each parameter is set, and the clutch execution state is obtained through multi-level judgment of the relationship between each parameter and the corresponding threshold value.

[0046] The process of setting the threshold value corresponding to each parameter includes: setting a first power threshold value and a second power threshold value of the current power of the battery pack; setting a preset torque threshold value of the engine required torque; and setting a preset speed difference threshold value of the speed difference between the engine and the motor.

[0047] The process of multi-level judgment of the relationship between each parameter and the corresponding threshold includes: judging whether the current power of the power battery pack is less than the first power threshold, and if so, judging the current state of the clutch; if not, judging the relationship between the engine demand torque and the preset torque threshold; if the current state of the clutch is not closed, judging the relationship between the speed difference between the engine and the motor and the preset speed difference threshold; if the current state of the clutch is closed, maintaining the current state of the clutch; if the engine demand torque is greater than the preset torque threshold; continuing to judge the current state of the clutch; if the engine demand torque is not greater than the preset torque threshold, judging the relationship between the current power of the power battery pack and the second power threshold.

[0048] When it is determined that the current power level of the power battery pack is less than a preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is less than a preset speed difference threshold, the hybrid system is controlled to partially close the clutch first and then fully close the clutch.

[0049] When it is determined that the current power level of the power battery pack is less than a preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is not less than the preset speed difference threshold, the hybrid system is controlled to first enter the engine speed following subroutine until the speed difference between the engine and the motor is less than the preset speed difference threshold, and then the hybrid system is controlled to partially close the clutch first, and then completely close the clutch.

[0050] When it is determined that the current power of the power battery pack is not less than the preset first power threshold and the engine demand torque is greater than the preset torque threshold, the current state of the clutch is determined; if the current state of the clutch is closed, the process ends; if the current state of the clutch is not closed, it is determined whether the speed difference between the engine and the motor is less than the preset speed difference threshold. If so, the hybrid system is controlled to partially close the clutch first, and then fully close the clutch; if not, the hybrid system is controlled to first enter the engine speed following subroutine until the speed difference between the engine and the motor is less than the preset speed difference threshold, and then the hybrid system is controlled to partially close the clutch first, and then fully close the clutch.

[0051] When it is determined that the current power of the power battery pack is not less than the preset first power threshold and the engine required torque is not greater than the preset torque threshold, it is then determined whether the current power of the power battery pack is greater than the second power threshold. If it is greater than the second power threshold, the clutch is disconnected with a delayed delay; if it is not greater than the second power threshold, the current state of the clutch is maintained.

[0052] The second power threshold is smaller than the first power threshold.

[0053] like Figure 1 This is a flow chart of a hybrid clutch control method proposed in Example 1 of the present invention;

[0054] In step S100 , the process starts.

[0055] In step S101 , it is determined whether the current power level of the power battery pack is less than a preset first power level threshold; if so, step S102 is executed; if not, step S103 is executed.

[0056] In step S102 , it is determined whether the clutch is currently closed; if closed, step S111 is executed; if not closed, step S105 is executed.

[0057] In step S103 , it is determined whether the engine demand torque is greater than a preset torque threshold. If so, step S102 is executed; if not, step S104 is executed.

[0058] In step S104 , it is determined whether the current power level of the power battery pack is greater than a second power level threshold; if not, step S111 is executed; if greater, step S109 is executed.

[0059] In step S105 , it is determined whether the speed difference between the engine and the motor is less than a preset speed difference threshold. If not, step S106 is executed; otherwise, step S107 is executed.

[0060] In step S107 , the engine speed follows.

[0061] In step S107 , the clutch is partially closed.

[0062] In step S108 , the clutch is fully closed.

[0063] In step S109, a delay time is set.

[0064] In step S110 , the clutch is disengaged.

[0065] In step S111 , the current state of the clutch is maintained and the process ends.

[0066] like Figure 2 This is a schematic diagram of a hybrid clutch control flow proposed in Example 1 of the present invention; Figure 2 and Figure 1 Combined to explain the implementation process of this application.

[0067] Embodiment 1 of the present invention proposes a hybrid clutch control method, which designs a multi-stage partial clutch closing state when the clutch is connected, effectively improving the smoothness of the clutch connection.

[0068] Embodiment 1 of the present invention proposes a hybrid clutch control method. When the current power level of the power battery pack is less than a certain value, the system keeps the clutch in a closed state, which can effectively reduce the number of times the clutch is on and off and increase the service life of the clutch.

[0069] Embodiment 1 of the present invention proposes a hybrid clutch control method, which designs a delay before disconnecting the clutch, for example, a delay of 5 seconds, and then disconnects the clutch. This effectively avoids the clutch connection and disconnection caused by the driver's rapid increase or decrease of the throttle, thereby improving the service life of the clutch.

[0070] Embodiment 1 of the present invention proposes a hybrid clutch control method and designs an engine speed following strategy. Before the clutch closes, the engine fuel injection amount is increased or decreased to ensure that the speed difference between the engine and the motor is less than a certain value. This improves the smoothness of the clutch connection, reduces the impact force of the clutch connection, and increases the service life of the clutch.

[0071] Example 2

[0072] Based on the hybrid clutch control method proposed in Example 1 of the present invention, Example 2 of the present invention proposes a hybrid clutch control system, such as Figure 3 This is a schematic diagram of a hybrid clutch control system proposed in Example 2 of the present invention. The system includes an acquisition module and a judgment module;

[0073] The acquisition module is used to obtain parameters that affect the execution state of the hybrid clutch, including the current power of the power battery pack, the current state of the clutch, the engine required torque, the engine speed, and the motor speed;

[0074] The judgment module is used to set the threshold value corresponding to each parameter, and obtain the clutch execution state through multi-level judgment of the relationship between each parameter and the corresponding threshold value.

[0075] The process of determining the relationship between each parameter and the corresponding threshold value through multiple levels in the judgment module includes:

[0076] Determine whether the current charge of the power battery pack is less than a first charge threshold, and if so, determine the current state of the clutch; if not, determine the relationship between the engine demand torque and a preset torque threshold;

[0077] If the clutch is not currently engaged, the relationship between the speed difference between the engine and the motor and a preset speed difference threshold is determined; if the clutch is currently engaged, the current state of the clutch is maintained;

[0078] If the engine demand torque is greater than the preset torque threshold, continue to judge the current state of the clutch; if the engine demand torque is not greater than the preset torque threshold, judge the relationship between the current power of the power battery pack and the second power threshold.

[0079] When it is determined that the current power level of the power battery pack is less than a preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is less than a preset speed difference threshold, the hybrid system is controlled to partially close the clutch first and then fully close the clutch.

[0080] When it is determined that the current power level of the power battery pack is less than a preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is not less than the preset speed difference threshold, the hybrid system is controlled to first enter the engine speed following subroutine until the speed difference between the engine and the motor is less than the preset speed difference threshold, and then the hybrid system is controlled to partially close the clutch first, and then completely close the clutch.

[0081] When it is determined that the current power of the power battery pack is not less than the preset first power threshold and the engine demand torque is greater than the preset torque threshold, the current state of the clutch is determined; if the current state of the clutch is closed, the process ends; if the current state of the clutch is not closed, it is determined whether the speed difference between the engine and the motor is less than the preset speed difference threshold. If so, the hybrid system is controlled to partially close the clutch first, and then fully close the clutch; if not, the hybrid system is controlled to first enter the engine speed following subroutine until the speed difference between the engine and the motor is less than the preset speed difference threshold, and then the hybrid system is controlled to partially close the clutch first, and then fully close the clutch.

[0082] When it is determined that the current power of the power battery pack is not less than the preset first power threshold and the engine required torque is not greater than the preset torque threshold, it is then determined whether the current power of the power battery pack is greater than the second power threshold. If it is greater than the second power threshold, the clutch is disconnected with a delayed delay; if it is not greater than the second power threshold, the current state of the clutch is maintained.

[0083] The second power threshold is smaller than the first power threshold.

[0084] Embodiment 2 of the present invention proposes a hybrid clutch control system, which designs a multi-stage partial clutch closing state when the clutch is connected, effectively improving the smoothness of the clutch connection.

[0085] Embodiment 2 of the present invention proposes a hybrid clutch control system. When the current power level of the power battery pack is less than a certain value, the system keeps the clutch in a closed state, which can effectively reduce the number of times the clutch is on and off and increase the service life of the clutch.

[0086] Embodiment 2 of the present invention proposes a hybrid clutch control system, which designs a delay before disconnecting the clutch, for example, a delay of 5 seconds, and then disconnects the clutch. This effectively avoids the clutch connection and disconnection caused by the driver's rapid increase or decrease of the throttle, thereby improving the service life of the clutch.

[0087] Embodiment 2 of the present invention proposes a hybrid clutch control system and designs an engine speed following strategy. Before the clutch closes, the engine fuel injection amount is increased or decreased to ensure that the speed difference between the engine and the motor is less than a certain value. This improves the smoothness of the clutch connection, reduces the impact force of the clutch connection, and increases the service life of the clutch.

[0088] For the description of the relevant parts of a hybrid clutch control system proposed in Example 2 of the present invention, reference can be made to the detailed description of the corresponding parts in a hybrid clutch control method provided in Example 1 of the present application, which will not be repeated here.

[0089] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device comprising a series of elements are inherent to the elements. In the absence of further restrictions, the elements limited by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. In addition, the above-mentioned technical solutions provided in the embodiments of the present application are not described in detail in accordance with the corresponding technical solutions in the prior art to achieve the same principle, so as to avoid excessive elaboration.

[0090] Although the above description is of specific embodiments of the present invention in conjunction with the accompanying drawings, it does not limit the scope of protection of the present invention. For those skilled in the art, other different forms of modifications or variations can be made based on the above description. It is not necessary and impossible to list all embodiments here. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without expending creative effort are still within the scope of protection of the present invention.

Claims

1. A hybrid clutch control method, characterized in that: Running on the vehicle controller, including the following steps: Obtaining parameters that affect the execution state of the hybrid clutch, the parameters including the current power of the power battery pack, the current state of the clutch, the engine required torque, the engine speed, and the motor speed; Set the threshold value corresponding to each parameter, and obtain the clutch execution state through multi-level judgment of the relationship between each parameter and the corresponding threshold value; The process of determining the relationship between each parameter and the corresponding threshold value through multiple levels includes: Determine whether the current charge of the power battery pack is less than a first charge threshold, and if so, determine the current state of the clutch; if not, determine the relationship between the engine demand torque and a preset torque threshold; If the clutch is not currently closed, the relationship between the speed difference between the engine and the motor and a preset speed difference threshold is determined; if the clutch is currently closed, the current state of the clutch is maintained; If the engine demand torque is greater than the preset torque threshold, then continue to determine the current state of the clutch; if the engine demand torque is not greater than the preset torque threshold, then determine the relationship between the current power level of the power battery pack and the second power level threshold; The process of obtaining the clutch execution state by multi-level judgment of the relationship between each parameter and the corresponding threshold includes: when it is judged that the current power of the power battery pack is less than the preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is less than the preset speed difference threshold, controlling the hybrid system to partially close the clutch first, and then completely close the clutch.

2. The hybrid clutch control method according to claim 1, characterized in that: The process of setting the threshold value corresponding to each parameter includes: Setting a first power threshold and a second power threshold of the current power of the battery pack; Setting a preset torque threshold for engine demand torque; A preset speed difference threshold is set for the speed difference between the engine and the motor.

3. The hybrid clutch control method according to claim 1, characterized in that: The process of obtaining the clutch execution state by multi-level determination of the relationship between each parameter and the corresponding threshold value also includes: When it is determined that the current power level of the power battery pack is less than a preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is not less than the preset speed difference threshold, the hybrid system is controlled to first enter the engine speed following subroutine until the speed difference between the engine and the motor is less than the preset speed difference threshold, and then the hybrid system is controlled to partially close the clutch first, and then completely close the clutch.

4. The hybrid clutch control method according to claim 1, characterized in that: The process of obtaining the clutch execution state by multi-level determination of the relationship between each parameter and the corresponding threshold value also includes: When it is determined that the current power of the power battery pack is not less than the preset first power threshold and the engine demand torque is greater than the preset torque threshold, the current state of the clutch is determined; if the current state of the clutch is closed, the process ends; if the current state of the clutch is not closed, it is determined whether the speed difference between the engine and the motor is less than the preset speed difference threshold. If so, the hybrid system is controlled to partially close the clutch first, and then fully close the clutch; if not, the hybrid system is controlled to first enter the engine speed following subroutine until the speed difference between the engine and the motor is less than the preset speed difference threshold, and then the hybrid system is controlled to partially close the clutch first, and then fully close the clutch.

5. The hybrid clutch control method according to claim 1, characterized in that: The process of obtaining the clutch execution state by multi-level judgment of the relationship between each parameter and the corresponding threshold also includes: when it is judged that the current power of the power battery pack is not less than the preset first power threshold and the engine required torque is not greater than the preset torque threshold, then it is judged whether the current power of the power battery pack is greater than the second power threshold. If it is greater than the second power threshold, the clutch is disconnected with a delay; if it is not greater than the second power threshold, the current state of the clutch is maintained.

6. The hybrid clutch control method according to claim 5, characterized in that: The second power threshold is smaller than the first power threshold.

7. A hybrid clutch control system, configured to execute a hybrid clutch control method according to any one of claims 1 to 6, characterized in that: Including acquisition module and judgment module; The acquisition module is used to acquire parameters that affect the execution state of the hybrid clutch, the parameters including the current power of the power battery pack, the current state of the clutch, the engine required torque, the engine speed, and the motor speed; The judgment module is used to set a threshold value corresponding to each parameter, and obtain the clutch execution state through multi-level judgment of the relationship between each parameter and the corresponding threshold value; The process of determining the relationship between each parameter and the corresponding threshold value through multiple levels includes: Determine whether the current charge of the power battery pack is less than a first charge threshold, and if so, determine the current state of the clutch; if not, determine the relationship between the engine demand torque and a preset torque threshold; If the clutch is not currently closed, the relationship between the speed difference between the engine and the motor and a preset speed difference threshold is determined; if the clutch is currently closed, the current state of the clutch is maintained; If the engine demand torque is greater than the preset torque threshold, then continue to determine the current state of the clutch; if the engine demand torque is not greater than the preset torque threshold, then determine the relationship between the current power level of the power battery pack and the second power level threshold; The process of obtaining the clutch execution state by multi-level judgment of the relationship between each parameter and the corresponding threshold includes: when it is judged that the current power of the power battery pack is less than the preset first power threshold, the current state of the clutch is not closed, and the speed difference between the engine and the motor is less than the preset speed difference threshold, controlling the hybrid system to partially close the clutch first, and then completely close the clutch.

Images