公开(公告)号：US11273833B2

公开(公告)日：2022-03-15

申请号：US16474636

申请日：2017-12-27

Applicant: BYD COMPANY LIMITED

Inventor： Yubo Lian ,  Heping Ling ,  Hao Chen ,  Guo Tian ,  Xinming Wei

IPC: B60W30/18 ,  B60K17/356 ,  B60L15/20 ,  B60W40/105

Abstract: An acceleration slip regulation method and device for a four-wheel drive electric vehicle are disclosed. The method comprises the following steps: detecting wheel speeds of four wheels of an electric vehicle and a depth of depression of an accelerator pedal; estimating a vehicle speed of the electric vehicle according to the wheel speeds of the four wheels, determining a road condition at the location of the electric vehicle according to the wheel speeds of the four wheels and the vehicle speed, and acquiring a required torque of the electric vehicle according to the depth of depression of the accelerator pedal, wherein the road condition comprising a low adhesion starting road, a joint road, and a bisectional road; and performing acceleration slip regulation on the four wheels respectively according to the road condition and the required torque. The control method can ensure that the wheels do not slip, the electric vehicle does not undergo lateral displacement and a yaw rate is kept within a certain range after the electric vehicle activates acceleration slip. The control method can maximize the use of ground adhesion to improve the escape capability of the electric vehicle.

公开(公告)号：US11876197B2

公开(公告)日：2024-01-16

申请号：US17416781

申请日：2019-12-20

Applicant: BYD COMPANY LIMITED

Inventor： Heping Ling ,  Hua Pan ,  Yuxin Zhang ,  Guo Tian ,  Zhao Xie

IPC: H01M10/615 ,  H01M10/613 ,  H01M10/625 ,  H01M10/635 ,  H01M10/6567 ,  H01M10/663 ,  B60L58/27 ,  H02J7/00 ,  H01M10/48

CPC classification number: H01M10/615 ,  B60L58/27 ,  H01M10/48 ,  H01M10/486 ,  H01M10/613 ,  H01M10/625 ,  H01M10/635 ,  H01M10/6567 ,  H01M10/663 ,  H02J7/0047 ,  H02J7/007194 ,  H01M2220/20

Abstract: In a power battery heating method for a vehicle, when a current temperature value of a power battery is lower than a preset temperature value, and a heating condition of the power battery meets a preset condition, a three-phase inverter is controlled to cause a three-phase alternating current motor to generate heat according to heating energy, to heat a coolant flowing through the power battery, a preset quadrature-axis current that causes a torque value outputted by the motor to be an appropriate value is obtained, and a corresponding preset direct-axis current is obtained according to heating power of the power battery, so as to control, according to the preset direct-axis current and the preset quadrature-axis current, the three-phase inverter to adjust a phase current of the three-phase alternating current motor in the heating process, where a direction of the preset direct-axis current changes periodically in the heating process.