Control method for heating during low-temperature starting of automatic transmission

Abstract

The invention relates to the technical field of low-temperature starting of automatic transmissions, and discloses a control method for heating during low-temperature starting of an automatic transmission. The method comprises the steps that S1, the automatic transmission is started, the temperature of oil liquid is collected, and an engine enters an engine heating state; S2, when the temperature of the oil liquid is lower than a first preset temperature, a heating piece is started to heat the oil liquid flowing through an oil pump, a low-temperature unloading valve is started, the oil pump rotates at a first preset rotating speed when the engine is heated, and the oil liquid in a bottom shell can return to the bottom shell sequentially through the oil pump, a filter and the low-temperature unloading valve until engine heating is finished; S3, whether the temperature of the oil liquid reaches a first preset temperature or not is judged, if yes, S4 is executed, and if not, the rotating speed of the oil pump is reduced to a second preset rotating speed till the temperature of the oil liquid is larger than or equal to the first preset temperature; and S4, the heating piece and the low-temperature unloading valve are closed. According to the control method for heating during low-temperature starting of the automatic transmission, the oil liquid does not need to be replaced with low-temperature-resistant lubricating oil, and the oil liquid can be rapidly heated.

Description

technical field [0001] The invention relates to the technical field of low-temperature starting of automatic transmissions, in particular to a control method for heating at low-temperature starting of automatic transmissions. Background technique [0002] The ambient temperature range of automobiles is large. Once the external ambient temperature is lower than -30°C, the viscosity of the lubricating oil will increase significantly, making the resistance of the lubricating oil flowing through the pipeline with the same length and pore diameter increase geometrically. In order to meet the low temperature system For normal operation, the operating power of the oil pump needs to be greatly increased. This mode of operation not only does not use the operation of the oil pump, but also cannot meet the needs of reducing power consumption. In the prior art, lubricating oil with better low temperature resistance is used to reduce the power increase of the oil pump. However, lubricati...

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Problems solved by technology

[0003] Based on the above, the object of the present invention is to provide a control method for automatic transmission low-temperature start-up heating, which can quickly heat the oil without replacing the oil with low-temperature-resistant lubricating oil, and solves the problem of low-temperature and high-power oil pumps. The transmission can meet the needs of lower temperature use

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