阅读说明：本技术 一种缓解液力自动变速器整车共振的控制方法 (Control method for relieving whole-vehicle resonance of hydraulic automatic transmission ) 是由 刘强 曹永� 高龙 宗伟 郭太民 杨磊 王洪志 吴玉德 王圣涛 李志宗 于 2020-08-01 设计创作，主要内容包括：本发明公开了一种缓解液力自动变速器整车共振的控制方法,液力变矩器在闭锁状态下,判断整车的共振程度符合条件时,控制液力变矩器由闭锁至打开状态；液力变矩器在打开状态持续时间t后,再控制液力变矩器由打开状态进入闭锁状态,利用自动变速器软件实时监测车辆共振程度,发生共振时用液力变矩器的打开状态,处于柔性连接来缓解整车共振,提高驾驶舒适性；设定共振的判定条件,避免了对共振的误判。(The invention discloses a control method for relieving the resonance of a whole hydraulic automatic transmission, wherein a hydraulic torque converter is controlled to be in a locked state and in an unlocked state when the resonance degree of the whole vehicle is judged to meet the condition; after the hydraulic torque converter is in the open state for the duration time t, the hydraulic torque converter is controlled to enter the locked state from the open state, the resonance degree of the vehicle is monitored in real time by using automatic transmission software, and when the resonance occurs, the open state of the hydraulic torque converter is in flexible connection to relieve the resonance of the whole vehicle, so that the driving comfort is improved; and the judgment condition of the resonance is set, so that the misjudgment of the resonance is avoided.)

1. A control method for relieving the resonance of a whole hydraulic automatic transmission is characterized by comprising the following steps:

(1) when the hydraulic torque converter is in a locked state and the resonance degree of the whole vehicle is judged to meet the condition, the hydraulic torque converter is controlled to be in an open state from a locked state;

(2) and after the torque converter is in the open state for the duration t, controlling the torque converter to enter the locked state from the open state.

2. The control method for relieving the resonance of the whole hydraulic automatic transmission as recited in claim 1, wherein the step of judging the resonance degree of the whole hydraulic automatic transmission comprises the following steps:

1) the difference between the wave crest and the wave trough of the input shaft rotating speed Ninput in a fluctuation cycle is larger than a rotating speed value delta n;

2) the time interval between the peak and the trough is less than the time Tm;

3) setting a counter, adding 1 to the counter when the condition 1) and the condition 2) are simultaneously met, and controlling the hydraulic torque converter to be in an open state from a locked state when the counter continuously counts to f;

4) in one period, the condition is not met, the counter returns to zero, and the resonance degree of the whole vehicle is monitored again.

3. The control method for relieving the integral resonance of the hydraulic automatic transmission as recited in claim 1, characterized in that: the time t is 15s-30 s.

4. The control method for relieving the integral resonance of the hydraulic automatic transmission as recited in claim 2, characterized in that:

the rotation speed value delta n is 150-300 revolutions.

5. The control method for relieving the integral resonance of the hydraulic automatic transmission as recited in claim 2, characterized in that:

the count f is 4-10.

6. The control method for relieving the integral resonance of the hydraulic automatic transmission as recited in claim 2, characterized in that: the time Tm is from 100 to 200 ms.

Technical Field

The invention belongs to the technical field of control of a hydraulic automatic transmission, and particularly relates to a control method for relieving the whole vehicle resonance of the hydraulic automatic transmission.

Background

The hydraulic torque converter is a transmission device for transmitting the power of an engine to a transmission, and consists of a pump impeller, a turbine wheel and a guide wheel. The pump wheel is connected with the flywheel end of the engine, and can convert the mechanical energy input by the engine into the kinetic energy of liquid by the action of centrifugal force, so that the turbine can do work. The turbine is connected to the transmission input shaft and is capable of transferring energy contained in the kinetic energy of the fluid to the transmission interior.

The working state of the hydraulic torque converter has two working conditions of opening and locking, when the working state is the opening state, the torque increasing effect can be achieved, the dynamic property is improved, the flexible connection is achieved, the resonance of the whole vehicle is relieved to a certain extent, and the opening working condition is generally used for vehicle low-gear starting or large accelerator acceleration. When the engine is in a locking state, the locking clutch inside the engine enters a locking working condition, the power of the engine can be transmitted to the transmission by 100%, the efficiency is high, the locking working condition is generally used for high-gear normal driving, and the using working condition and the using period are long.

The resonance of the whole vehicle is a common problem in the development process and is normal, each vehicle has a resonance point, and only the vehicle speeds are different when the vehicle resonates, so that the resonance area of the whole vehicle is reduced as much as possible in the development process of the whole vehicle, and the resonance is mainly realized by optimizing chassis or engine hardware. For example, a vibration and noise reduction device is additionally installed, and a resonance detection alarm method, a device and a system are installed, and the main defects are as follows: the above modes mainly adopt hardware optimization, the cost is high, and the verification period is long.

In the process of implementing the invention, the inventor finds that the prior art has at least the following defects: when the valve is in an open state, the efficiency is low because oil is transferred; when the vehicle is in a locking state, the vehicle is in hard connection, and when the whole vehicle resonates, the vehicle feels obvious, and the driving comfort level is reduced.

At present, no method for relieving the resonance of the whole vehicle by adopting a mode of temporarily opening a hydraulic torque converter through software control is found.

Disclosure of Invention

The invention aims to solve the technical problem of providing a control method for relieving the whole vehicle resonance of the hydraulic automatic transmission, overcoming the defects of the existing control method.

In order to solve the technical problems, the technical scheme of the invention is as follows: a control method for relieving the resonance of a whole hydraulic automatic transmission is characterized by comprising the following steps:

(1) when the hydraulic torque converter is in a locked state and the resonance degree of the whole vehicle is judged to meet the condition, the hydraulic torque converter is controlled to be in an open state from a locked state;

(2) and after the torque converter is in the open state for the duration t, controlling the torque converter to enter the locked state from the open state.

An optimization scheme, which judges the resonance degree of the whole vehicle comprises the following steps:

1) the difference between the wave crest and the wave trough of the input shaft rotating speed Ninput in a fluctuation cycle is larger than a rotating speed value delta n;

2) the time interval between the peak and the trough is less than the time Tm;

3) setting a counter, adding 1 to the counter when the condition 1) and the condition 2) are simultaneously met, and controlling the hydraulic torque converter to be in an open state from a locked state when the counter continuously counts to f;

4) in one period, the condition is not met, the counter returns to zero, and the resonance degree of the whole vehicle is monitored again.

In an optimized scheme, the time t is generally set to be 15s-30 s.

In an optimized scheme, the rotating speed value delta n is generally set to be 150-300 revolutions.

In an optimization, the count f is typically set to 4-10.

In an optimization scheme, the time Tm is typically set to 100-200 ms.

By adopting the technical scheme, compared with the prior art, the invention has the following advantages: the resonance degree of the vehicle is monitored in real time by using automatic transmission software, and when resonance occurs, the resonance of the whole vehicle is relieved by using the opening state of a hydraulic torque converter and in flexible connection, so that the driving comfort is improved; and the transmission efficiency of the engine power is not influenced.

And the judgment condition of the resonance is set, so that the misjudgment of the resonance is avoided.

Drawings

Fig. 1 is a monitoring flow chart of relieving the resonance degree of the whole hydraulic automatic transmission in the embodiment of the invention.

Detailed Description

In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings, and it will be understood by those skilled in the art that the following should not be construed as limiting the scope of the present invention.