Method and device for starting a vehicle at low temperature

Abstract

The invention discloses a low-temperature vehicle starting method and device. The method includes the steps: determining starting power when receiving vehicle starting signals; controlling an engine to drive an ISG motor to generate power and controlling the ISG motor to drive a TM driving motor when the electric quantity of a power battery is larger than a preset electric quantity threshold value, power provided by the power battery at current temperature cannot meet the starting requirement of a vehicle and the temperature of the power battery is lower than a preset temperature threshold value. Therefore, vehicle starting can be ensured at the low temperature of the power battery without additionally increasing a power assembly or hardware configuration of the whole vehicle. Moreover, after the vehicle is started, the power battery is slightly charged and discharged, the temperature of the power battery is rapidly improved, so that the power battery directly supplies power for the TMdriving motor in next starting, and the vehicle is started.

Description

technical field [0001] The invention relates to the field of vehicle control, in particular to a method and device for starting a vehicle at low temperature. Background technique [0002] For hybrid direct drive hybrid vehicles, such as figure 1 , shows a schematic diagram of a series hybrid power system. Under normal circumstances, when the vehicle starts, the power battery supplies power to the TM drive motor to drive the TM drive motor. However, in the cold winter, because the power battery is not equipped with heating equipment such as a warmer, when the vehicle is cold started, the battery temperature is low, the chemical reaction inside the power battery is slow, the power of the power battery is limited, and the power battery cannot meet the starting requirements. demand, resulting in vehicle breakdowns or traffic jams. [0003] In the prior art, the TM drive motor is usually directly driven by the engine, but the target matching engine motor is small, and the TM dr...

AI Technical Summary

Problems solved by technology

However, in the cold winter, since the power battery is not equipped with heating equipment such as a warmer, when the vehicle is cold started, the battery temperature is low, the chemical reaction inside the power battery is slow, the power of the power battery is limited, and the power battery cannot meet the starting requirements. demand, resulting in vehicle breakdown or traffic jams, etc.

[0003] In the prior art, the TM drive motor is usually driven directly by the engine, but the target matching engine motor is small, and the TM drive motor cannot be directly driven by the engine to start the vehicle. If it is replaced with an engine with a larger motor, the cost higher

Images