Method for calculating rotating speed of guide wheel of hydraulic torque converter

Abstract

A hydraulic torque converter guide wheel rotating speed calculation method comprises the following steps that (1) a hydraulic torque converter CFD simulation calculation model is built; (2) coupling working conditions are selected, and the rotating speed v0 of the guide wheel is estimated in a random generation mode; and 3) inputting the rotating speed vi of the guide wheel into the CFD simulation calculation model of the hydraulic torque converter to obtain the torque Li of the guide wheel corresponding to the rotating speed vi of the guide wheel. The initial value of i is 0; and (4) judging whether the guide wheel torque Li is close to 0 or not, if yes, taking the guide wheel rotating speed vi as the guide wheel rotating speed of the hydraulic torque converter under the current coupling working condition, and if not, letting vi = vi-delta i, and returning to the step (3). Delta i is the iteration step length of the rotating speed of the guide wheel. The rotating speed of the guide wheel can be approximately calculated. The method can be widely applied to calculation of the hydraulic torque converter guide wheel rotating speed.

Description

Technical Field

[0001] The invention relates to the field of fluid transmission devices, and in particular to a method for calculating the rotation speed of a guide wheel of a hydraulic torque converter. Background Art

[0002] With the rapid development of my country's automobile industry, automatic transmissions are increasingly used in modern cars. Torque converters are one of the core components of automatic transmissions (AT) and continuously variable transmissions (CVT). Torque converters use the flow of liquid to smoothly transfer engine torque to automatic transmissions. The inside of the torque converter is a ring-shaped device filled with automatic transmission oil, located between the engine and the automatic transmission. At present, single-stage, two-phase, three-element locking integrated torque converters consisting of a pump wheel, a turbine, a guide wheel and a locking clutch are widely used in cars. The pump wheel is an active component, which is connected to the flywheel through a cover assembly welded to it, converts mechanical energy into liquid energy, guides the liquid to impact the turbine blades, causes the blades to rotate and drive the turbine, and realizes the conversion of liquid energy into mechanical energy. The turbine is a passive component connected to the transmission input shaft. The guide wheel between the two impellers is fixed to the automatic transmission oil pump cover through a one-way clutch and a guide wheel sleeve, and the locking clutch is installed between the cover assembly and the turbine. The connection relationship between the main components of the automobile torque converter, such as the pump wheel assembly, the guide wheel assembly, the turbine assembly, the cover assembly and the locking clutch assembly, has been clearly recorded in existing literature.

[0003] When the torque converter is in the torque converter working condition, the speed of the guide wheel is 0; when the torque ratio of the torque converter is 1, the torque converter enters the coupling condition, and the guide wheel starts to rotate under the action of the one-way clutch. Summary of the invention

[0004] The object of the present invention is to provide a method for calculating the rotation speed of a hydraulic torque converter guide wheel, comprising the following steps:

[0005] 1) Construct a CFD simulation model for the torque converter.

[0006] 2) Select the coupling condition and estimate the guide wheel speed v by random generation 0 .

[0007] 3) Set the guide wheel speed v i Input into the torque converter CFD simulation model to obtain the guide wheel speed v i Corresponding guide wheel torque L i . The initial value of i is 0.

[0008] 4) Determine the guide wheel torque L iIs it close to 0? If so, the guide wheel speed v i As the torque converter guide wheel speed under the current coupling condition, if not, let v i =v i -Δi, and return to step 3). Δi is the iteration step of the guide wheel speed.

[0009] Furthermore, the error between the guide wheel torque output by the CFD simulation calculation model of the torque converter and the actual guide wheel torque does not exceed a%, where a is a positive number.

[0010] Furthermore, the error between the guide wheel torque output by the CFD simulation calculation model of the torque converter and the actual guide wheel torque does not exceed 6%.

[0011] Furthermore, when the torque ratio of the torque converter is 1, the torque converter enters the coupling condition.

[0012] Furthermore, when the torque converter enters the coupling condition, the pump wheel, turbine wheel and guide wheel of the torque converter are all in a steady-state condition.

[0013] Furthermore, the steady-state operating condition is a condition in which the pump impeller, turbine and guide impeller all have fixed rotation speeds.

[0014] Furthermore, the guide wheel torque L i Close to 0, which means L i ≤0.01.

[0015] The technical effect of the present invention is undoubted, and the present invention can approximately calculate the rotation speed of the guide wheel. The present invention can be widely used in calculating the rotation speed of the guide wheel of a hydraulic torque converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Flowchart for calculation of guide wheel speed. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0018] Embodiment 1:

[0019] See also Figure 1 , a method for calculating the speed of a hydraulic torque converter guide wheel, comprising the following steps:

[0020] 1) Construct a CFD simulation model for the torque converter.

[0021] 2) Select the coupling condition and estimate the guide wheel speed v by random generation 0.

[0022] 3) Set the guide wheel speed v i Input into the torque converter CFD simulation model to obtain the guide wheel speed v i Corresponding guide wheel torque L i . The initial value of i is 0.

[0023] 4) Determine the guide wheel torque L i Is it close to 0? If so, the guide wheel speed v i As the torque converter guide wheel speed under the current coupling condition, if not, let v i =v i -Δi, and return to step 3). Δi is the iteration step of the guide wheel speed.

[0024] Embodiment 2:

[0025] A method for calculating the speed of a guide wheel of a torque converter. The main technical content is shown in Example 1. Furthermore, the error between the guide wheel torque output by the CFD simulation calculation model of the torque converter and the actual guide wheel torque does not exceed a%, where a is a positive number.

[0026] Embodiment 3:

[0027] A method for calculating the speed of a guide wheel of a torque converter, the main technical content of which is shown in any one of embodiments 1 to 2. Furthermore, the error between the guide wheel torque output by the CFD simulation calculation model of the torque converter and the actual guide wheel torque does not exceed 6%.

[0028] Embodiment 4:

[0029] A method for calculating the speed of a guide wheel of a torque converter, the main technical content of which is shown in any one of embodiments 1 to 3. Furthermore, when the torque ratio of the torque converter is 1, the torque converter enters a coupling condition.

[0030] Embodiment 5:

[0031] A method for calculating the rotational speed of a torque converter guide wheel, the main technical content of which is shown in any one of embodiments 1 to 4. Furthermore, when the torque converter enters a coupling condition, the pump wheel, turbine and guide wheel of the torque converter are all in a steady-state condition.

[0032] Embodiment 6:

[0033] A method for calculating the speed of a torque converter guide wheel, the main technical content of which is shown in any one of Examples 1 to 5. Furthermore, the steady-state operating condition is a condition in which the pump wheel, turbine and guide wheel all have fixed speeds.

[0034] Embodiment 7:

[0035] A method for calculating the speed of a guide wheel of a torque converter, the main technical content of which is shown in any one of embodiments 1 to 6. Further, the guide wheel torque L i Close to 0, which means L i ≤0.01.

[0036] Embodiment 8:

[0037] See also Figure 1 , a method for calculating the speed of a hydraulic torque converter guide wheel, comprising the following steps:

[0038] 1) Construct a CFD simulation model for the torque converter.

[0039] 2) Select the coupling condition and estimate the guide wheel speed v0 by random generation.

[0040] The randomly generated rotation speed should be greater than a preset threshold, which is determined based on historical data.

[0041] 3) Set the guide wheel speed v i Input into the torque converter CFD simulation model to obtain the guide wheel speed v i Corresponding guide wheel torque L i . The initial value of i is 0.

[0042] 4) Determine the guide wheel torque L i Is it close to 0? If so, the guide wheel speed v i As the torque converter guide wheel speed under the current coupling condition, if not, let v i =v i -Δi, and return to step 3). Δi is the iteration step of the guide wheel speed.

[0043] Embodiment 9:

[0044] A method for calculating the speed of a guide wheel of a torque converter. The main technical content is shown in Example 8. Furthermore, the error between the guide wheel torque output by the CFD simulation calculation model of the torque converter and the actual guide wheel torque does not exceed a%, where a is a positive number.

[0045] Embodiment 10:

[0046] A method for calculating the speed of a guide wheel of a torque converter, the main technical content of which is shown in any one of Examples 8 to 9. Furthermore, the error between the guide wheel torque output by the CFD simulation calculation model of the torque converter and the actual guide wheel torque does not exceed 6%.

[0047] Embodiment 11:

[0048] A method for calculating the speed of a guide wheel of a torque converter, the main technical content of which is shown in any one of embodiments 8 to 10. Furthermore, when the torque ratio of the torque converter is 1, the torque converter enters a coupling condition.

[0049] When the torque converter is in the torque converter working condition, the speed of the guide wheel is 0; when the torque ratio of the torque converter is 1, the torque converter enters the coupling condition, and the guide wheel starts to rotate under the action of the one-way clutch.

[0050] Embodiment 12:

[0051] A method for calculating the rotational speed of a torque converter guide wheel, the main technical content of which is shown in any one of Examples 8 to 11. Furthermore, when the torque converter enters a coupling condition, the pump wheel, turbine and guide wheel of the torque converter are all in a steady-state condition.

[0052] In a certain coupling condition, according to the force balance principle, the external force exerted on the fluid inside the torque converter is the reaction force exerted by the pump wheel, turbine and guide wheel. At this time, the speeds of the pump wheel, turbine and guide wheel are all fixed, that is, in a steady-state condition.

[0053] Embodiment 13:

[0054] A method for calculating the speed of a torque converter guide wheel, the main technical content of which is shown in any one of Examples 8 to 12. Furthermore, the steady-state operating condition is a condition in which the pump wheel, turbine and guide wheel all have fixed speeds.

[0055] Embodiment 14:

[0056] A method for calculating the speed of a guide wheel of a torque converter, the main technical content of which is shown in any one of Embodiments 8 to 13. Further, the guide wheel torque L i Close to 0, which means L i ≤0.01.

[0057] Embodiment 15:

[0058] See also Figure 1 , a method for calculating the speed of a hydraulic torque converter guide wheel, the main technical contents include:

[0059] On the premise of having the ability to simulate the torque converter (Computational Fluid Dynamics, CFD), in a certain coupling condition, according to the force balance principle, the external force exerted on the fluid inside the torque converter is the reaction force exerted by the pump wheel, turbine and stator. At this time, the speeds of the pump wheel, turbine and stator are all fixed, that is, steady-state conditions. Therefore, the sum of the external forces on the stator is zero. The speed when the stator torque is closest to 0 is found through CFD simulation calculation, which is the speed of the stator.

[0060] The calculation process of the patent of the present invention is as follows: the error between the CFD simulation calculation model of the torque converter and the test result does not exceed 6%. A certain coupling working condition where the guide wheel speed needs to be obtained is selected, a guide wheel speed is estimated in the CFD simulation software, and then a simulation calculation is performed to obtain the guide wheel torque. The calculation is repeated until the guide wheel torque is close to zero, and the corresponding guide wheel speed is the approximately estimated guide wheel speed.

Claims

1. A method for calculating the speed of a hydraulic torque converter guide wheel, characterized in that: The following steps are involved: 1) Construct a CFD simulation model for the torque converter; 2) Select the coupling condition and estimate the guide wheel speed v0 by random generation. 3) Set the guide wheel speed v i Input into the torque converter CFD simulation model to obtain the guide wheel speed v i Corresponding guide wheel torque L i ; The initial value of i is 0. 4) Determine the guide wheel torque L i Is it close to 0? If so, the guide wheel speed v i As the torque converter guide wheel speed under the current coupling condition, if not, let v i =v i -Δi, and return to step 3); Δi is the iteration step of the guide wheel speed.

2. The method for calculating the speed of a hydraulic torque converter guide wheel according to claim 1, characterized in that: The error between the guide wheel torque output by the CFD simulation calculation model of the torque converter and the actual guide wheel torque does not exceed a%, where a is a positive number.

3. The method for calculating the speed of a hydraulic torque converter guide wheel according to claim 1, characterized in that: The error between the guide wheel torque output by the CFD simulation calculation model of the torque converter and the actual guide wheel torque does not exceed 6%.

4. The method for calculating the speed of a hydraulic torque converter guide wheel according to claim 1, characterized in that: When the torque ratio of the torque converter is 1, the torque converter enters the coupling condition.

5. The method for calculating the speed of a hydraulic torque converter guide wheel according to claim 4, characterized in that: When the torque converter enters the coupling condition, the pump wheel, turbine wheel and guide wheel of the torque converter are all in a steady-state condition.

6. A method for calculating the speed of a hydraulic torque converter guide wheel according to claim 5, characterized in that: The steady-state operating condition is a condition in which the pump impeller, turbine and guide impeller all have fixed rotational speeds.

7. The method for calculating the speed of a hydraulic torque converter guide wheel according to claim 1, characterized in that: The guide wheel torque L i Close to 0, which means L i ≤0.01.

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