A control method for low temperature cold start of automatic hydraulic transmission
A technology of hydraulic transmission and control method, which is applied in the direction of transmission control, vehicle gearbox, multi-ratio transmission, etc., and can solve problems such as reducing transmission load, increasing transmission belt loss, and insufficient engine start-up ability , to achieve the effect of reducing the load and improving the success rate of cold start
Active Publication Date: 2020-07-14
SHENGRUI TRANSMISSION
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[0007] The same strategy is used for starting at normal temperature and starting at low temperature. The control process of this strategy is as follows: during the engine starting process, the transmission in neutral state combines two clutches at the same time, which will increase the transmission loss and increase the load. Under the condition of low temperature, the starting ability of the engine itself is insufficient, which will lead to the failure of starting
[0008] like figure 2 As shown, it is the starting method commonly used at present. When the engine speed has just risen, when it reaches about 500 rpm, the engine has not been fully started at this time, and the transmission controls the two clutches B1 and C4 in the neutral position. Pressure from 0bar to 20bar, this time will inevitably bring load to the engine, affecting the engine start
[0009] like image 3 As shown, at extremely low temperature, such as -30 degrees, the starting performance of the engine itself will be weaker than normal temperature under this working condition. If the transmission controls the two clutches B1 and C4 in the neutral position during the engine starting process Action, there will be a situation where the engine starting ability is not enough to overcome the transmission load, resulting in a drop in speed, and finally becomes 0, and the start fails
[0010] At present, there are no technical measures to reduce the transmission load from the control software at home and abroad
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[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that the following does not constitute a limitation to the protection scope of the present invention.
[0032] Examples such as Figure 4 As shown, a control method for low-temperature cold start of an automatic hydraulic transmission, including a start-up phase control step and a delay phase control step;
[0033] After the engine starts at low temperature, the two clutches (B1, C4) that control the neutral gear are disengaged; when the engine reaches the maximum speed and enters the running stage, the engine continues to run for a delay time t; then control the two clutches (B1, C4) that are neutral atresia.
[0034] Specifically, the control steps in the start-up phase include: after the engin...
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The invention discloses a control method for low-temperature cold start of an automatic hydraulic transmission, which includes a start-up stage control step and a delay-stage control step; after the engine is started at low temperature, two clutches (B1, C4) controlling neutral are in a disengaged state; The engine reaches the maximum speed and enters the running stage, and the engine continues to run for a delay time t; then the two clutches (B1, C4) in neutral are locked and wait for the engine to start before combining. This strategy helps reduce the speed of transmission when the engine starts. The load brought by the process can greatly improve the success rate of cold start.
Description
technical field [0001] The invention belongs to the technical field of automatic transmission control, and in particular relates to a control method for low-temperature cold start of an automatic hydraulic transmission. Background technique [0002] During the use of the car, ignition is the most common operation, and whether the start is successful depends mainly on the starting ability of the engine and the size of the vehicle load. The starting ability of the engine is strong, the load of the whole vehicle is small, the easier it is to start the car, and the shorter the time is. Among them, the load of the transmission is an important factor affecting the load of the vehicle, so how to reduce the load of the transmission is related to the difficulty of starting. [0003] In the process of vehicle development and testing, it is relatively easy to start at room temperature, which mainly refers to the start above -10°C, and there will be no problem of unsuccessful start, bu...
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IPC IPC(8): F16H61/02F16H61/16
CPCF16H61/0213F16H61/16F16H2061/0232F16H2200/2043
Inventor刘强曹永郭太民宗伟杨磊陈彦波王洪志李志宗王圣涛
OwnerSHENGRUI TRANSMISSION