公开(公告)号：US12038082B1

公开(公告)日：2024-07-16

申请号：US18339394

申请日：2023-06-22

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Wenwu Ma ,  Yi Cao ,  Maojie Ren ,  Jinsong Zhang

IPC: F16H57/04 ,  B60K1/00 ,  F16H57/02

CPC classification number: F16H57/0476 ,  B60K1/00 ,  F16H57/0436 ,  F16H2057/02034 ,  F16H2057/02043 ,  F16H57/0486

Abstract: A control method and apparatus may be applied to an electric drive system. The electric drive system includes an oil pump, a motor, a reducer, and a housing, the motor and the reducer are disposed in the housing, lubricating oil is stored in the housing, and the oil pump is configured to pump the lubricating oil. The method includes: obtaining a first rotational speed of the motor, a second rotational speed of the oil pump, and a temperature of the lubricating oil in the housing; and controlling a rotational speed of the oil pump to be a third rotational speed based on the first rotational speed, the second rotational speed, and the temperature. In this way, the rotational speed of the oil pump can be adjusted to change liquid levels of the lubricating oil in a cavity and oil pump power at different rotational speeds of the oil pump.

公开(公告)号：US20240383348A1

公开(公告)日：2024-11-21

申请号：US18789500

申请日：2024-07-30

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Ningbo Feng ,  Ying Li ,  Maojie Ren

IPC: B60L53/122 ,  B60L53/24 ,  H02J7/00

Abstract: This disclosure provides a control method and apparatus for a power supply circuit, and an electric vehicle. The power supply circuit includes a first switch, three bridge arms, and a motor. Each bridge arm includes a first switching transistor and a second switching transistor. The control method is: when detecting that the direct current power supply stops supplying power, controlling the first switch to be turned off; after the first switch is turned off, controlling a second switching transistor of a first bridge arm, a first switching transistor of a second bridge arm among the bridge arms, and a first switching transistor of a third bridge arm among the bridge arms to be turned on, and providing, by the power battery, a first current to the motor, where the first current controls a torque of the motor. This disclosure is implemented to improve NVH characteristics of the electric vehicle.