KR-20260065303-A - Oil Flow Control Device for Automatic Transmission Cooling and Its Control Method

Abstract

The present invention relates to an oil flow control method for efficiently cooling oil by controlling the flow of oil for cooling an automatic transmission. By cooling the oil by allowing it to flow to an air-cooled cooler when the vehicle is driving on the road and by allowing it to flow to a water-cooled cooler when driving off-road, the invention achieves the effect of improving the vehicle's fuel efficiency through oil cooling suitable for the vehicle's driving conditions and preventing the deterioration of the lubrication performance of the torque converter or gearbox caused by increased heat generation of the oil.

Inventors

• 강동훈

Assignees

• 현대자동차주식회사
• 기아 주식회사

Dates

Publication Date

20260508

Application Date

20241101

Claims (10)

1. A step of collecting input signal information from various sensors of a vehicle; A step of predicting the heat of the oil through a set calculation process using the collected input signal information; and A step of changing the flow of the oil from an air cooler to a water cooler if the predicted oil heat output exceeds a reference threshold heat output for more than a set time; including, Method for controlling oil flow for automatic transmission cooling.
2. In paragraph 1, The above input signal information is, including at least one of engine speed, engine torque, turbine speed, gear ratio, and lock-up signal, Method for controlling oil flow for automatic transmission cooling.
3. In paragraph 1, The calculation process set above is, Step to calculate the speed ratio; Step to calculate the toconv; Step of calculating turbine torque; and Step to calculate Torken loss; including, Method for controlling oil flow for automatic transmission cooling.
4. In paragraph 3, The above speed ratio is, Derived through [Mathematical Formula 1] below, Method for controlling oil flow for automatic transmission cooling. [Mathematical Formula 1]
5. In paragraph 3, The above Torconbi is, Derived through [Mathematical Formula 2] below, Method for controlling oil flow for automatic transmission cooling. [Mathematical Formula 2] Torque ratio = f(velocity ratio)
6. In paragraph 3, The above turbine torque is, Derived through [Mathematical Formula 3] below, Method for controlling oil flow for automatic transmission cooling. [Mathematical Formula 3]
7. In paragraph 3, The above torque loss is, Derived through [Mathematical Formula 4] below, Method for controlling oil flow for automatic transmission cooling. [Mathematical Formula 4] (EngRPM: Engine RPM, EngTQ: Engine Torque, TurRPM: Turbine RPM, TurTQ: Turbine Torque)
8. In paragraph 1, The time set above is, Between 20 and 100 seconds, Method for controlling oil flow for automatic transmission cooling.
9. A controller comprising: a collection unit that collects input signal information from various sensors of a vehicle; a calculation unit that predicts the heat generation amount of the oil through a set calculation process based on the collected input signal information; and a control unit that transmits a control signal to change the flow of the oil from an air cooler to a water cooler if the predicted heat generation amount of the oil exceeds a reference threshold heat generation amount for more than a set time; and A valve unit that receives the control signal generated by the above controller and changes the flow of the oil; including, Oil flow control device for automatic transmission cooling.
10. In Paragraph 9, The above valve part is, 3-way electronic valve, Oil flow control device for automatic transmission cooling.

Description

Oil Flow Control Device for Automatic Transmission Cooling and Its Control Method The present invention relates to an oil flow control method for efficiently cooling oil by controlling the flow of oil for cooling an automatic transmission. Generally, an automatic transmission automatically operates gears according to the vehicle's driving speed, enabling optimal torque conversion automatically in accordance with the vehicle's driving speed and load, and allowing the machine to automatically control clutch and gear shifting operations on behalf of the driver according to driving conditions. Pickup trucks or SUVs are frequently driven off-road, and the automatic transmissions installed in pickup trucks or SUVs operate with the lock-up connecting the impeller and turbine of the torque converter always disengaged due to the characteristics of off-road sections, where the vehicle speed is very low and there is a demand for instantaneous high torque. For this reason, automatic transmissions installed in off-road pickup trucks or SUVs experience a problem where severe oil overheating is generated due to slip inside the torque converter. Conventional automatic transmissions control heat generation by supplying oil to an air-cooled cooler when heat is generated. However, when a vehicle is driven off-road, the vehicle's speed is low, which reduces cooling efficiency and creates a problem where efficient oil cooling cannot be achieved. Although there is a method to cool the oil using a water-cooled cooler to solve this, constantly cooling the oil with a water-cooled cooler lowers the engine's coolant temperature, which worsens fuel efficiency and increases exhaust gas emissions. Therefore, a solution to address this issue is currently required. The matters described above as background technology are intended only to enhance understanding of the background of the present invention and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art. FIG. 1 is a flowchart of an oil flow control method for cooling an automatic transmission according to an embodiment of the present invention. FIG. 2 is a diagram illustrating the process of calculating torque loss in an oil flow control method for cooling an automatic transmission according to an embodiment of the present invention. Figure 3 is a graph showing the oil heat generated in real time through a torque loss calculation process in an oil flow control method for cooling an automatic transmission according to an embodiment of the present invention. FIG. 4 is a drawing illustrating a controller of an oil flow control device for cooling an automatic transmission according to an embodiment of the present invention. FIG. 5 is a diagram illustrating the flow of oil in an oil flow control device for cooling an automatic transmission according to an embodiment of the present invention. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Terms including ordinal numbers, such as “first,” “second,” etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. The term “and/or” is used to include any combination of the multiple items in question. For example, “A and/or B” means including all three cases, such as “A,” “B,” and “A and B.” When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. In the description of the embodiments, the statement that each layer (film), region, pattern, or structure is formed "on" or "under" the substrate, each layer (film), region, pad, or pattern includes both direct formation and formation through another layer. The criteria for "on" or "under" are based on the appearance depicted in the drawings for convenience and are used merely to indicate the relative positional relationship between components for convenience; they should not be understood as limiting the actual positions of the components. For example, "on B" merely indicates that B is depicted on A in the drawings unless otherwise stated or if, due to the attributes of A or B, A must be positioned on B. In actual products, B may be positioned under A, or B and A may be arranged side by side