Control method, control device and vehicle for a hydrodynamic torque converter
By obtaining the torque converter speed ratio in heavy-duty vehicles and controlling the unlocking and locking states of the hydraulic torque converter in conjunction with throttle opening and vehicle speed, the locking shock problem of hydraulic torque converters in heavy-duty vehicles is solved, thereby improving fuel economy and shifting comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUBEI SANJIANG SPACE WANSHAN SPECIAL VEHICLE
- Filing Date
- 2022-09-15
- Publication Date
- 2026-05-12
AI Technical Summary
Existing control methods for hydraulic torque converters are difficult to balance power, economy, and comfort in heavy vehicles and construction machinery, especially in terms of lock-up shock and transmission reliability.
By acquiring the torque converter speed ratio and controlling the unlocking and locking states of the hydraulic torque converter based on the throttle opening and vehicle speed when the speed ratio is greater than the threshold, the state of the hydraulic torque converter is determined by utilizing the adaptive characteristics of the torque converter and combining the lock-up curve and upshift curve, thus avoiding frequent unlocking or locking.
It effectively reduces the lock-up impact of the hydraulic torque converter, improves fuel economy and shifting comfort, and enhances the reliability of the chassis drive system.
Smart Images
Figure CN115899246B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle control technology, and in particular to a control method for a hydraulic torque converter, a control device, and a vehicle. Background Technology
[0002] Heavy vehicles and construction machinery are commonly equipped with hydraulic torque converters. To improve the overall fuel economy of the transmission system, the hydraulic torque converter has a lock-up function, converting hydraulic transmission into mechanical transmission. Lock-up control of the hydraulic torque converter typically employs single-parameter lock-up control based on engine speed or vehicle speed, or dual-parameter control based on vehicle speed and throttle opening.
[0003] Single-parameter control is simple in design because it only uses single-parameter control based on vehicle speed or engine speed. Under certain medium-to-high load conditions, the vehicle can only balance power, economy, and comfort. However, under other conditions, the torque converter remains unlocked, and the engine operates at high speed, resulting in high noise and poor fuel economy and comfort. Dual-parameter control uses throttle opening and vehicle speed to control locking and unlocking. In heavy vehicles and construction machinery, due to the vehicle's heavy weight, low power reserve coefficient, and harsh road conditions, dual-parameter locking based on throttle and speed is difficult to handle the locking shock under common operating conditions, reducing comfort. At the same time, the large locking shock has an adverse effect on the reliability of the transmission system. Summary of the Invention
[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
[0005] Therefore, a first aspect of the present invention provides a control method for a hydraulic torque converter.
[0006] A second aspect of the present invention provides a control device.
[0007] A third aspect of the present invention provides a vehicle.
[0008] In view of this, a control method for a hydraulic torque converter is proposed according to a first aspect of the embodiments of this application, comprising:
[0009] Obtain the torque converter speed ratio;
[0010] When the torque converter speed ratio is greater than the speed ratio threshold, the unlocking and locking states of the hydraulic torque converter are controlled based on the throttle opening and vehicle speed.
[0011] In one feasible implementation, the torque converter speed ratio is the ratio of turbine speed to pump wheel speed, and the speed ratio threshold is between 0.65 and 0.85.
[0012] In one feasible implementation, the control method further includes:
[0013] When the torque converter speed ratio is less than or equal to the speed ratio threshold, the hydraulic torque converter is controlled to remain in the unlocked state.
[0014] In one feasible implementation, the step of controlling the unlocking and locking states of the hydraulic torque converter based on the throttle opening and vehicle speed when the torque converter speed ratio is greater than the speed ratio threshold includes:
[0015] When the torque converter speed ratio is greater than the speed ratio threshold, the first torque curve of the engine and hydraulic torque converter working together under different throttle openings is obtained.
[0016] Obtain the second torque curve of the engine operating independently under different throttle openings;
[0017] Under the same coordinate system, obtain the first intersection point of the first torque curve and the second torque curve;
[0018] Connect multiple first intersection points to obtain the locking curve;
[0019] Obtain the third torque curve of the wheel output under different gears;
[0020] Under the same coordinate system, obtain the second intersection point of the third torque curves of two adjacent gears;
[0021] Connect the second intersection point between two adjacent gear positions to obtain the upshift curve;
[0022] Based on the lock-up curve and the upshift curve, the unlocking and lock-up states of the hydraulic torque converter are determined.
[0023] In one feasible implementation, the step of determining the unlocking and locking states of the hydraulic torque converter based on the lock-up curve and the upshift curve includes:
[0024] In the same coordinate system, when the first vehicle speed corresponding to the lock-up curve is greater than the second vehicle speed corresponding to the upshift curve, and the difference is greater than a first threshold, the hydraulic torque converter is controlled to remain in the lock-up state.
[0025] In the same coordinate system, when the first vehicle speed corresponding to the locking curve is less than the second vehicle speed corresponding to the upshift curve, and the difference is greater than the first threshold, the hydraulic torque converter is controlled to remain in the unlocked state.
[0026] In the same coordinate system, when the difference between the first vehicle speed corresponding to the locking curve and the second vehicle speed corresponding to the upshift curve is less than or equal to the first threshold, the hydraulic torque converter is controlled to maintain the current state.
[0027] In one feasible implementation, the step of controlling the unlocking and locking states of the hydraulic torque converter based on the throttle opening and vehicle speed when the torque converter speed ratio is greater than the speed ratio threshold further includes:
[0028] Based on the locking curve, obtain the unlocking curve;
[0029] Based on the upshift curve, obtain the downshift curve;
[0030] Based on the unlocking curve and the downshifting curve, the unlocking and locking states of the hydraulic torque converter are determined.
[0031] In one feasible implementation, the step of obtaining the unlocking curve based on the locking curve includes:
[0032] In the same coordinate system, the locking curve is shifted by the first scale in the direction of decreasing vehicle speed to obtain the unlocking curve;
[0033] The step of obtaining the downshift curve based on the upshift curve includes:
[0034] In the same coordinate system, the upshift curve is shifted by a second scale in the direction of decreasing vehicle speed to obtain the unlock curve.
[0035] In one feasible implementation, the step of determining the unlocking and locking states of the hydraulic torque converter based on the unlocking curve and the downshifting curve includes:
[0036] In the same coordinate system, when the third vehicle speed corresponding to the unlocking curve is greater than the fourth vehicle speed corresponding to the downshifting curve, and the difference is greater than the second threshold, the hydraulic torque converter is controlled to remain in the unlocked state.
[0037] In the same coordinate system, when the third vehicle speed corresponding to the unlocking curve is less than the fourth vehicle speed corresponding to the downshifting curve, and the difference is greater than the second threshold, the torque converter is controlled to remain in the locked state. When the vehicle reaches the downshifting curve, the torque converter is controlled to switch to the unlocked state.
[0038] In the same coordinate system, when the difference between the third vehicle speed corresponding to the unlocking curve and the fourth vehicle speed corresponding to the downshifting curve is less than or equal to the second threshold, the hydraulic torque converter is controlled to maintain the current state.
[0039] A control device is provided according to a second aspect of the embodiments of this application, comprising:
[0040] Memory, which stores computer programs;
[0041] The processor executes the computer program;
[0042] When the processor executes the computer program, it implements the control method described in the above technical solution.
[0043] A vehicle is provided according to a third aspect of the embodiments of this application, comprising:
[0044] The control device as described in the above technical solution;
[0045] A hydraulic torque converter, wherein the control device is connected to the hydraulic torque converter and is used to control the hydraulic torque converter.
[0046] Compared to existing technologies, the present invention offers at least the following advantages: The control method for a hydraulic torque converter provided in this application first obtains the torque converter speed ratio. When the torque converter speed ratio is greater than a speed ratio threshold, the unlocking and locking states of the hydraulic torque converter are controlled based on the throttle opening and vehicle speed. This application addresses the problem of large locking shock in hydraulic transmissions for heavy-duty vehicles by adding a torque converter speed ratio parameter to the dual-parameter system. Utilizing the adaptive characteristics of the torque converter, when the vehicle load is high and the torque converter speed ratio is low, it can remain unlocked to prevent locking under a large speed difference between the pump wheel and turbine, thus avoiding excessive locking shock. When the vehicle load is low and the torque converter speed ratio is high, the speed difference between the pump wheel and turbine is small, resulting in a small locking shock. In this case, the unlocking and locking of the hydraulic torque converter are controlled by the throttle opening and vehicle speed, while also considering fuel economy. Attached Figure Description
[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0048] Figure 1 A schematic flowchart illustrating the steps of a control method for a hydraulic torque converter according to an embodiment of this application;
[0049] Figure 2 A schematic diagram of the first torque curve in a control method for a hydraulic torque converter according to an embodiment of this application;
[0050] Figure 3 A schematic diagram of the third torque curve in a control method for a hydraulic torque converter according to an embodiment of this application;
[0051] Figure 4 A schematic diagram of the lock-up curve, upshift curve, unlock curve, and downshift curve in a control method for a hydraulic torque converter according to an embodiment of this application;
[0052] Figure 5This is a structural block diagram of a control device according to an embodiment of this application. Detailed Implementation
[0053] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.
[0054] like Figure 1 As shown, a control method for a hydraulic torque converter is proposed according to a first aspect of an embodiment of this application, comprising:
[0055] Step 101: Obtain the torque converter speed ratio. It can be understood that the torque converter speed ratio is the ratio of the turbine speed to the pump impeller speed.
[0056] Step 102: When the torque converter ratio is greater than the ratio threshold, control the unlocking and locking states of the hydraulic torque converter based on throttle opening and vehicle speed. It can be understood that when the torque converter ratio is less than or equal to the ratio threshold, the torque converter can be controlled to be in the unlocked state to prevent locking under large speed differences between the pump impeller and turbine, which could cause excessive locking shock. When the torque converter ratio is greater than the ratio threshold, the operating state of the hydraulic torque converter is controlled based on both throttle opening and vehicle speed, taking fuel economy into account.
[0057] The control method for a hydraulic torque converter provided in this application first obtains the torque converter speed ratio. When the torque converter speed ratio is greater than a speed ratio threshold, the unlocking and locking states of the hydraulic torque converter are controlled based on the throttle opening and vehicle speed. This application addresses the problem of large locking shock in hydraulic transmissions for heavy-duty vehicles by adding a torque converter speed ratio parameter to the existing dual-parameter system. Utilizing the adaptive characteristics of the torque converter, when the vehicle load is high and the torque converter speed ratio is low, it can remain unlocked to prevent locking under a large speed difference between the pump impeller and turbine, which would cause excessive locking shock. When the vehicle load is low and the torque converter speed ratio is high, the speed difference between the pump impeller and turbine is small, resulting in less locking shock. In this case, the unlocking and locking of the hydraulic torque converter are controlled by the throttle opening and vehicle speed, while also considering fuel economy.
[0058] It is understandable that the speed ratio threshold can be correlated with the vehicle's gear position; that is, the speed ratio threshold is different under different gear conditions. The specific value of the speed ratio threshold can be determined based on the torque converter's highest efficiency point. In other words, the speed ratio threshold is determined based on the vehicle's gear position and the torque converter's speed ratio when it operates at its highest efficiency.
[0059] In some examples, the torque converter speed ratio is the ratio of turbine speed to pump wheel speed, with a speed ratio threshold ranging from 0.65 to 0.85.
[0060] The speed ratio threshold is set between 0.65 and 0.85, further clarifying its specific range. If the speed ratio threshold is less than 0.65, the torque converter speed ratio is likely to be greater than the threshold. This means that the vehicle will need to control the torque converter's operation using both throttle opening and vehicle speed parameters in most operating conditions, and the vehicle will still face the technical problem of difficulty in balancing lock-up shock under common operating conditions, thus reducing comfort. If the speed ratio threshold is greater than 0.85, the torque converter will be in the unlocked state in most situations, making it impossible to balance lock-up shock and fuel economy.
[0061] By setting the speed ratio threshold to 0.65 to 0.85, when the vehicle load is high and the torque converter speed ratio is low, the system can remain unlocked to prevent locking under a large speed difference between the pump wheel and the turbine, which would cause excessive locking shock. When the vehicle load is low and the torque converter speed ratio is high, the speed difference between the pump wheel and the turbine is small, and the locking shock is small. In this case, the unlocking and locking of the hydraulic torque converter can be controlled by the throttle opening and vehicle speed, while also taking into account fuel economy.
[0062] In some examples, the control method also includes: keeping the hydraulic torque converter in the unlocked state when the torque converter ratio is less than or equal to the ratio threshold.
[0063] When the torque converter speed ratio is less than or equal to the speed ratio threshold, keeping the hydraulic torque converter in the unlocked state can prevent lock-up under large speed difference between the pump wheel and the turbine, which would cause excessive lock-up impact.
[0064] In some examples, when the torque converter ratio is greater than a ratio threshold, the steps for controlling the unlocking and locking states of the hydraulic torque converter based on throttle opening and vehicle speed include: when the torque converter ratio is greater than the ratio threshold, obtaining a first torque curve output by the engine and hydraulic torque converter working together under different throttle openings; obtaining a second torque curve of the engine working alone under different throttle openings; obtaining a first intersection point of the first torque curve and the second torque curve in the same coordinate system; connecting multiple first intersection points to obtain a locking curve; obtaining a third torque curve output by the wheels in different gears; obtaining a second intersection point of the third torque curves of two adjacent gears in the same coordinate system; connecting the second intersection points between two adjacent gears to obtain an upshift curve; and determining the unlocking and locking states of the hydraulic torque converter based on the locking curve and the upshift curve.
[0065] like Figure 2 As shown, the first torque curves output by the engine and torque converter working together under different throttle openings are displayed, where the horizontal axis is the turbine shaft speed and the vertical axis is the turbine shaft torque.
[0066] Plot the second torque curve when the engine is operating alone and the first torque curve when the engine and the torque converter are operating together. Connect the intersection of the first and second torque curves to obtain the lock-up curve. Then, obtain the third torque curves output when the wheels are actually working in different gears. Connect the intersection of the third torque curves of two adjacent gears to obtain the upshift curve. Based on the lock-up curve and the upshift curve, determine the unlocking and lock-up states of the torque converter, which can further improve fuel economy.
[0067] like Figure 3 As shown, a schematic diagram of the third torque curve under different gears is presented, where the horizontal axis represents vehicle speed and the vertical axis represents driving force.
[0068] In some examples, the steps for determining the unlocked and locked states of the torque converter based on the lock-up curve and the upshift curve include: in the same coordinate system, when the first vehicle speed corresponding to the lock-up curve is greater than the second vehicle speed corresponding to the upshift curve, and the difference is greater than a first threshold, controlling the torque converter to remain in the locked state; in the same coordinate system, when the first vehicle speed corresponding to the lock-up curve is less than the second vehicle speed corresponding to the upshift curve, and the difference is greater than the first threshold, controlling the torque converter to remain in the unlocked state; in the same coordinate system, when the difference between the first vehicle speed corresponding to the lock-up curve and the second vehicle speed corresponding to the upshift curve is less than or equal to the first threshold, controlling the torque converter to remain in the current state.
[0069] This technical solution further clarifies the specific steps for determining the unlocking and locking states of the hydraulic torque converter based on the lock-up curve and the upshift curve. By comparing the lock-up curve and the upshift curve in the same coordinate system, the unlocking or locking state of the hydraulic torque converter is determined based on the first vehicle speed and the second vehicle speed corresponding to the lock-up curve and the upshift curve. This facilitates the processor to process data quickly and can improve the response efficiency of the hydraulic torque converter control.
[0070] When the first vehicle speed corresponding to the lock-up curve is less than the second vehicle speed corresponding to the upshift curve, and the difference is greater than the first threshold, the torque converter is controlled to remain in the unlocked state. When the difference between the first vehicle speed corresponding to the lock-up curve and the second vehicle speed corresponding to the upshift curve is less than or equal to the first threshold, the torque converter is controlled to remain in the current state. This can prevent heavy vehicles from locking up under high load and large speed difference, effectively control the lock-up impact, improve comfort and chassis transmission system reliability, and can forcibly unlock during transmission shifting. It utilizes the good vibration isolation and damping characteristics of the torque converter to improve shifting comfort.
[0071] By selecting a first threshold, frequent unlocking and delocking of the hydraulic torque converter can be avoided. In some examples, the value of the first threshold can be between 2 km / h and 5 km / h. For example, if the first threshold is 3 km / h, and the speed difference between the lock-up curve and the corresponding upshift curve is less than 3 km / h, the lock-up of the current gear can be canceled to avoid frequent unlocking and delocking.
[0072] In some examples, when the torque converter ratio is greater than the ratio threshold, the steps of controlling the unlocking and locking states of the hydraulic torque converter based on throttle opening and vehicle speed further include: obtaining the unlocking curve based on the locking curve; obtaining the downshifting curve based on the upshifting curve; and determining the unlocking and locking states of the hydraulic torque converter based on the unlocking curve and the downshifting curve.
[0073] After obtaining the lock-up curve and upshift curve, the unlocking curve and downshift curve can also be obtained from the lock-up curve and upshift curve. Furthermore, the unlocking and lock-up status of the torque converter can be determined based on the unlocking curve and downshift curve, which can further improve fuel economy.
[0074] In some examples, the steps to obtain the unlocking curve based on the locking curve include: shifting the locking curve by a first scale in the direction of decreasing vehicle speed in the same coordinate system to obtain the unlocking curve; the steps to obtain the downshifting curve based on the upshifting curve include: shifting the upshifting curve by a second scale in the direction of decreasing vehicle speed in the same coordinate system to obtain the unlocking curve.
[0075] This technical solution further provides specific steps for obtaining the unlocking curve and downshifting curve through the locking curve and upshifting curve. The unlocking curve is obtained by translating the locking curve in the coordinate system, and the unlocking curve is obtained by translating the upshifting curve in the coordinate system, which facilitates the determination of the locking curve and upshifting curve.
[0076] In some examples, the first scale can be 5 km / h to 8 km / h, and the second scale can be 6 km / h to 20 km / h.
[0077] like Figure 4 As shown, a state diagram is displayed where the locking curve, upshift curve, unlocking curve, and downshift curve are all within the same coordinate system, where the horizontal axis represents vehicle speed and the vertical axis represents throttle opening.
[0078] In some examples, the steps for determining the unlocked and locked states of the torque converter based on the unlocking curve and the downshifting curve include: in the same coordinate system, when the third vehicle speed corresponding to the unlocking curve is greater than the fourth vehicle speed corresponding to the downshifting curve, and the difference is greater than a second threshold, controlling the torque converter to remain in the unlocked state; in the same coordinate system, when the third vehicle speed corresponding to the unlocking curve is less than the fourth vehicle speed corresponding to the downshifting curve, and the difference is greater than the second threshold, controlling the torque converter to remain in the locked state, and controlling the torque converter to switch to the unlocked state when the vehicle reaches the downshifting curve; in the same coordinate system, when the difference between the third vehicle speed corresponding to the unlocking curve and the fourth vehicle speed corresponding to the downshifting curve is less than or equal to the second threshold, controlling the torque converter to remain in the current state.
[0079] This technical solution further clarifies the unlocking curve and downshifting curve, and the steps for determining the unlocking and locking states of the hydraulic torque converter. By comparing the unlocking curve and downshifting curve in the same coordinate system, the unlocking or locking state of the hydraulic torque converter is determined based on the third and fourth vehicle speeds corresponding to the unlocking curve and downshifting curve. This facilitates rapid data processing by the processor and improves the response efficiency of the hydraulic torque converter control.
[0080] When the third vehicle speed corresponding to the unlock curve is greater than the fourth vehicle speed corresponding to the downshift curve, and the difference is greater than the second threshold, the torque converter is controlled to remain in the unlocked state. When the third vehicle speed corresponding to the unlock curve is less than the fourth vehicle speed corresponding to the downshift curve, and the difference is greater than the second threshold, the torque converter is controlled to remain in the locked state. When the vehicle reaches the downshift curve, the torque converter is then controlled to switch to the unlocked state. This avoids locking of heavy vehicles under high load and large speed difference, effectively controls locking shock, improves comfort and chassis transmission system reliability, and can forcibly unlock during transmission shifting. It utilizes the good vibration isolation and damping characteristics of the torque converter to improve shifting comfort.
[0081] By selecting a second threshold, frequent unlocking and delocking of the torque converter can be avoided. In some examples, the value of the second threshold can be between 2 km / h and 5 km / h. For example, if the value of the second threshold is 3 km / h, and the vehicle speed of the unlocking curve and the corresponding downshift curve is less than 3 km / h, the unlocking of the current gear can be canceled to avoid frequent unlocking and delocking.
[0082] like Figure 5 As shown, a control device is proposed according to a second aspect of the embodiments of this application, including: a memory 501 storing a computer program; and a processor 502 executing the computer program; wherein, when the processor 502 executes the computer program, it implements the control method of the above-described technical solution.
[0083] The control device provided in this application first obtains the torque converter speed ratio. When the torque converter speed ratio is greater than the speed ratio threshold, it then controls the unlocking and locking states of the hydraulic torque converter based on the throttle opening and vehicle speed. This application addresses the problem of large locking shock in hydraulic transmissions for heavy-duty vehicles by adding a torque converter speed ratio parameter to the existing dual-parameter configuration. Utilizing the adaptive characteristics of the torque converter, when the vehicle load is high and the torque converter speed ratio is low, it can remain unlocked to prevent locking under a large speed difference between the pump wheel and turbine, which would cause excessive locking shock. When the vehicle load is low and the torque converter speed ratio is high, the speed difference between the pump wheel and turbine is small, resulting in less locking shock. In this case, the unlocking and locking of the hydraulic torque converter is controlled by the throttle opening and vehicle speed, while also considering fuel economy.
[0084] It is understandable that the speed ratio threshold can be correlated with the vehicle's gear position; that is, the speed ratio threshold is different under different gear conditions. The specific value of the speed ratio threshold can be determined based on the torque converter's highest efficiency point. In other words, the speed ratio threshold is determined based on the vehicle's gear position and the torque converter's speed ratio when it operates at its highest efficiency.
[0085] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0086] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0087] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to perform actions such as... Figure 1 The process of the application protection method in the corresponding embodiment.
[0088] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).
[0089] A vehicle is provided according to a third aspect of the embodiments of this application, including: a control device as described above; a hydraulic torque converter, wherein the control device is connected to the hydraulic torque converter and is used to control the hydraulic torque converter.
[0090] The vehicle provided in this application embodiment includes the control device of the above-described technical solution, and therefore the vehicle possesses all the beneficial effects of the control device of the above-described technical solution.
[0091] Understandably, a vehicle can also include an engine and wheels. The engine can drive the vehicle independently, or it can drive the wheels together with a torque converter.
[0092] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0093] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0094] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0095] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A control method for a hydraulic torque converter, characterized in that, include: Obtain the torque converter speed ratio; When the torque converter speed ratio is greater than the speed ratio threshold, the unlocking and locking states of the hydraulic torque converter are controlled based on the throttle opening and vehicle speed, including: When the torque converter speed ratio is greater than the speed ratio threshold, the first torque curve of the engine and hydraulic torque converter working together under different throttle openings is obtained. Obtain the second torque curve of the engine operating independently under different throttle openings; Under the same coordinate system, obtain the first intersection point of the first torque curve and the second torque curve; Connect multiple first intersection points to obtain the locking curve; Obtain the third torque curve of the wheel output under different gears; Under the same coordinate system, obtain the second intersection point of the third torque curves of two adjacent gears; Connect the second intersection point between two adjacent gear positions to obtain the upshift curve; Based on the lock-up curve and the upshift curve, the unlocking and lock-up states of the hydraulic torque converter are determined.
2. The control method according to claim 1, characterized in that, The torque converter speed ratio is the ratio of the turbine speed to the pump wheel speed, and the speed ratio threshold value is between 0.65 and 0.
85.
3. The control method according to claim 1, characterized in that, Also includes: When the torque converter speed ratio is less than or equal to the speed ratio threshold, the hydraulic torque converter is controlled to remain in the unlocked state.
4. The control method according to claim 1, characterized in that, The step of determining the unlocking and locking states of the hydraulic torque converter based on the lock-up curve and the upshift curve includes: In the same coordinate system, when the first vehicle speed corresponding to the lock-up curve is greater than the second vehicle speed corresponding to the upshift curve, and the difference is greater than a first threshold, the hydraulic torque converter is controlled to remain in the lock-up state. In the same coordinate system, when the first vehicle speed corresponding to the locking curve is less than the second vehicle speed corresponding to the upshift curve, and the difference is greater than the first threshold, the hydraulic torque converter is controlled to remain in the unlocked state. In the same coordinate system, when the difference between the first vehicle speed corresponding to the locking curve and the second vehicle speed corresponding to the upshift curve is less than or equal to the first threshold, the hydraulic torque converter is controlled to maintain the current state.
5. The control method according to claim 4, characterized in that, The step of controlling the unlocking and locking states of the hydraulic torque converter based on the throttle opening and vehicle speed when the torque converter speed ratio is greater than the speed ratio threshold further includes: Based on the locking curve, obtain the unlocking curve; Based on the upshift curve, obtain the downshift curve; Based on the unlocking curve and the downshifting curve, the unlocking and locking states of the hydraulic torque converter are determined.
6. The control method according to claim 5, characterized in that, The step of obtaining the unlocking curve based on the locking curve includes: In the same coordinate system, the locking curve is shifted by the first scale in the direction of decreasing vehicle speed to obtain the unlocking curve; The step of obtaining the downshift curve based on the upshift curve includes: In the same coordinate system, the upshift curve is shifted by a second scale in the direction of decreasing vehicle speed to obtain the unlock curve.
7. The control method according to claim 6, characterized in that, The step of determining the unlocking and locking states of the hydraulic torque converter based on the unlocking curve and the downshifting curve includes: In the same coordinate system, when the third vehicle speed corresponding to the unlocking curve is greater than the fourth vehicle speed corresponding to the downshifting curve, and the difference is greater than the second threshold, the hydraulic torque converter is controlled to remain in the unlocked state. In the same coordinate system, when the third vehicle speed corresponding to the unlocking curve is less than the fourth vehicle speed corresponding to the downshifting curve, and the difference is greater than the second threshold, the torque converter is controlled to remain in the locked state. When the vehicle reaches the downshifting curve, the torque converter is controlled to switch to the unlocked state. In the same coordinate system, when the difference between the third vehicle speed corresponding to the unlocking curve and the fourth vehicle speed corresponding to the downshifting curve is less than or equal to the second threshold, the hydraulic torque converter is controlled to maintain the current state.
8. A control device, characterized in that, include: Memory, which stores computer programs; The processor executes the computer program; Wherein, when the processor executes the computer program, it implements the control method as described in any one of claims 1 to 7.
9. A vehicle, characterized in that, include: The control device as described in claim 8; A hydraulic torque converter, wherein the control device is connected to the hydraulic torque converter and is used to control the hydraulic torque converter.