Gear shifting control method for preventing temperature of DCT clutch from being too high
A control method and clutch technology, applied in the direction of transmission control, toothed components, belts/chains/gears, etc., can solve the driver's bad driving experience, the service life of the clutch friction plate is reduced, and the temperature of the clutch friction plate is rapid Problems such as rising to achieve the effect of reducing the probability of triggering and improving driving experience
Active Publication Date: 2022-03-04
CHONGQING TSINGSHAN IND
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Problems solved by technology
In the process of shifting without power interruption, a large amount of clutch friction will inevitably cause the temperature of the clutch friction plate to rise rapidly, and the high temperature of the clutch friction plate will reduce the service life of the clutch friction plate
[0003] Moreover, when the temperature of the clutch friction plate is too high, it will trigger the temperature protection strategies of the clutch such as "execute abandoning gear shift", "limit engine torque", "change clutch engagement rate", etc., which will bring a very bad driving experience to the driver.
Method used
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Embodiment Construction
[0028] Such as figure 1 As shown, a shift control method for preventing DCT clutch temperature from being too high may include the following steps:
[0029] 1) Determine whether the current gear of the DCT is equal to the target gear:
[0030] 1-1) If the current gear of the DCT is equal to the target gear, the DCT does not need to shift gears;
[0031] 1-2) If the current gear of the DCT is not equal to the target gear, the DCT needs to shift gears;
[0032] 2) When the DCT needs to shift gears, if the real-time engine torque is greater than the engine torque threshold for power shifting under the current driving conditions, shift gears according to the following method:
[0033] In this embodiment, the engine torque threshold value during the power shift under the current driving condition is obtained according to the real-time accelerator opening, the current gear, and the target gear, according to the engine torque threshold comparison table, and the engine torque The t...
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The invention discloses a gear shifting control method for preventing the temperature of a DCT clutch from being too high. The gear shifting control method comprises the following steps that (1) whether gear shifting is needed or not is judged; and (2) when gear shifting is needed, gear shifting is carried out according to the following method: (2-1) if the current gear is smaller than the target gear and the temperature threshold value of the odd / even clutches is larger than the sum of the real-time temperature of the odd / even clutches and the upshift temperature rise value, power upshift is carried out; 2-2) if the current gear is greater than the target gear, judging whether to perform power downshift or not according to the following method: I, if the clutch temperature threshold value is greater than the sum of the clutch real-time temperature and the downshift temperature rise value, performing power downshift; and II, if the temperature threshold value of the clutch is smaller than or equal to the sum of the real-time temperature of the clutch and the downshift temperature rise value, the target gear is increased step by step, and the steps 2-2 are repeated till the temperature threshold value of the clutch is larger than the sum of the real-time temperature of the clutch and the downshift temperature rise value.
Description
technical field [0001] The invention relates to the field of automobile DCT, in particular to a gear shift control method for preventing the DCT clutch from being overheated. Background technique [0002] Both DCT and DCT-based hybrid transmissions can switch gears quickly and without power interruption during operation. In the process of shifting without power interruption, a large amount of clutch friction will inevitably cause the temperature of the clutch friction plate to rise rapidly, and the high temperature of the clutch friction plate will reduce the service life of the clutch friction plate. [0003] Moreover, when the temperature of the clutch friction plate is too high, it will trigger the temperature protection strategies of the clutch such as "execute abandoning gear shift", "limit engine torque", "change clutch engagement rate", etc., which will bring a very bad driving experience to the driver. . [0004] Therefore, how to properly shift gears while control...
Claims
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Login to View More IPC IPC(8): F16H61/12
CPCF16H61/12F16H2061/1232F16H2061/128F16H2061/0075
Inventor 银联作赵秋林林远宗刘丽萍仇坤刘德财方世杰陈国利张祥瑞曾开莲
Owner CHONGQING TSINGSHAN IND