Method and device for acquiring linear starting point of double clutch
A dual-clutch and acquisition method technology, applied in the field of vehicle clutches, can solve problems such as large deviation of expected pressure and affect shifting comfort, and achieve the effect of fast response speed
Active Publication Date: 2017-03-08
SAIC MOTOR
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Problems solved by technology
[0005] The embodiment of the present invention solves the problem of how to obtain the linear starting point of the clutch to avoid the large deviation between the actual pressure response and the expected pressure during the clutch interaction process, which affects the comfort of shifting
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Embodiment Construction
[0037] In the prior art, it is difficult for the oil filled in the clutch oil-filled oil chamber to make the actual pressure of the clutch at a linear initial point. Typically, there is an overfill or underfill situation where the actual clutch pressure deviates from the linear start point. Regardless of whether the oil is filled too much or too little, the actual pressure response and the expected pressure will deviate during the subsequent clutch interaction process, causing shift shock and affecting driving comfort.
[0038] In the embodiment of the present invention, each time the current of the solenoid valve of the odd-even clutch increases from 0 to the first current value, the corresponding actual pressure value when the pressure change rate is greater than the preset threshold value is acquired. When the N actual pressure values are all within the preset pressure range and the difference between them is small, the average value of the N actual pressure values is t...
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The invention relates to a method and device for acquiring the linear starting point of double clutch. The method includes: when the double clutch satisfies preset conditions, detecting whether an odd-even clutch electromagnetic valve and a pressure sensor fail or not; if not, controlling the times of currents, increasing from 0 to a first current value at preset first step length, of the odd-even clutch electromagnetic valve to reach N times; acquiring the corresponding actual pressure when the pressure change rate of the double clutch is larger than a preset threshold in each current increasing; when the acquired N actual pressure is located in a preset pressure range and the difference between every two pressure is located in a preset difference range, calculating the average of the N actual pressure to serve as the linear starting point of the double clutch. By the method and device, the linear starting point of the clutch can be acquired, the problem that the difference between the actual pressure and expected pressure is large during double clutch interaction is avoided, and gear shifting quality is increased.
Description
technical field [0001] The invention relates to the field of vehicle clutches, in particular to a method and device for obtaining a linear starting point of a dual clutch. Background technique [0002] The dual-clutch automatic transmission is a complex system in which the mechanical, electrical and hydraulic systems work together. In a car equipped with a dual-clutch automatic transmission, the power of the engine can be transmitted to the wheels without interruption through the interaction of the clutches during the shifting process to achieve power shifting. [0003] Due to the constructional characteristics of wet clutches, the clutch fill chamber needs to be pre-filled with fluid before clutch interaction begins. In an ideal situation, the pre-filled oil in the oil-filled oil chamber can make the pressure of the clutch at a linear starting point, that is, the actual pressure of the clutch can increase linearly. When the pressure of the clutch is at the linear start po...
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Login to View More IPC IPC(8): F16D28/00F16H61/688
Inventor 边淑伟王小军焦伟孙贤安陈亮
Owner SAIC MOTOR