Abstract: A powertrain, a coolant flow rate estimation method, and an electric vehicle are provided. Coolant in a first cooling loop of the powertrain is configured to cool an inverter. An electronic pump drives the coolant to circulate in the first cooling loop. When a phase current of a motor is greater than or equal to a preset current value, a controller determines a rotation speed of the electronic pump at a first moment as a first rotation speed, and determines a coolant flow rate at the first moment based on a temperature at a first position in the first cooling loop, a temperature at a second position in the inverter, and a power loss of the inverter. In the solution of this application, data does not need to be separately calibrated for different thermal management systems. This reduces time consumed by data calibration and improves practicability.

Abstract: A monocular vision-based method for measuring displacement and trajectory of planar motion. In this method, a sequence image of a motion of a high-contrast feature mark fixed on a moving plane to be measured is collected using a camera. A sub-pixel coordinate of a feature edge of a linear motion of the sequence in an X direction and a Y direction is extracted using a sub-pixel edge detection method, and the sub-pixel coordinate is converted into a corresponding world coordinate. The world coordinate of the feature edge is fitted based on a least squares principle to obtain a straight line of the feature edge to realize decoupling measurement of a displacement in the X direction and the Y direction. The planar motion trajectory is obtained through measuring the displacement in the X direction and the Y direction.

Abstract: The present invention discloses a modular charging device and a cooling structure thereof. The modular charging device comprises a housing, at least one battery package socket located on the housing, and a PCB located in the housing, the at least one battery package socket being located at one or two sides of the PCB, at least one battery package being electrically connectable into the at least one battery package socket in a plug-in manner, and the battery package socket comprising a battery package insertion slot extending inwards from the housing to the PCB. A cooling structure for a modular charging device comprises an air inlet disposed at one end of a housing, an air outlet at another end, and a pathway between a first PCB and a second PCB, the fan causing an airflow to flow through the pathway.

Abstract: A six-degree-of-freedom measurement method by machine vision based on physical decoupling. A point projector capable of emitting three laser beams perpendicular to each other is placed on a measured object. A rear-projection screen is configured to allow the three laser beams to be projected thereon as three laser points. The collection of motion images is performed by a camera. Plane coordinates of the three laser points are obtained by processing a sequence image. A mathematical decoupling model is built according to a nature of sphere and a spatial position relationship of three laser beams. The plane coordinates of the three laser points are input into the mathematical decoupling model to obtain six-degree-of-freedom information of the measured object.

Abstract: A thermal management system includes a compressor, a water-cooled condenser, a battery chiller, a valve body assembly, a first water pump, a second water pump, and a third water pump that are disposed in a centralized manner. The thermal management system can separately form a passenger compartment cooling loop, a passenger compartment heating loop, a battery cooling loop, a battery heating loop, and an electrical driver cooling loop, and any one or more of the passenger compartment, the battery, and the electrical driver can be cooled or heated.

Abstract: This application provides a powertrain, a coolant flow rate estimation method, and an electric vehicle. Coolant in a first cooling loop of the powertrain is configured to cool an inverter. An electronic pump drives the coolant to circulate in the first cooling loop. When a phase current of a motor is greater than or equal to a preset current value, a controller determines a rotation speed of the electronic pump at a first moment as a first rotation speed, and determines a coolant flow rate at the first moment based on a temperature at a first position in the first cooling loop, a temperature at a second position in the inverter, and a power loss of the inverter. In the solution of this application, data does not need to be separately calibrated for different thermal management systems. This reduces time consumed by data calibration and improves practicability.

Abstract: A monocular vision-based method for measuring displacement and trajectory of planar motion. In this method, a sequence image of a motion of a high-contrast feature mark fixed on a moving plane to be measured is collected using a camera. A sub-pixel coordinate of a feature edge of a linear motion of the sequence in an X direction and a Y direction is extracted using a sub-pixel edge detection method, and the sub-pixel coordinate is converted into a corresponding world coordinate. The world coordinate of the feature edge is fitted based on a least squares principle to obtain a straight line of the feature edge to realize decoupling measurement of a displacement in the X direction and the Y direction. The planar motion trajectory is obtained through measuring the displacement in the X direction and the Y direction.

Abstract: A six-degree-of-freedom measurement method by machine vision based on physical decoupling. A point projector capable of emitting three laser beams perpendicular to each other is placed on a measured object. A rear-projection screen is configured to allow the three laser beams to be projected thereon as three laser points. The collection of motion images is performed by a camera. Plane coordinates of the three laser points are obtained by processing a sequence image. A mathematical decoupling model is built according to a nature of sphere and a spatial position relationship of three laser beams. The plane coordinates of the three laser points are input into the mathematical decoupling model to obtain six-degree-of-freedom information of the measured object.

Abstract: A p2mp ring network protection method including, for each ring in the p2mp ring network, determining p2mp services with an identical off-ring node as a protection group; and establishing a pair of closed loop channels in opposite directions for each protection group; for each p2mp service, taking one of the closed loop channels as a working channel, and taking the other one of the closed loop channels as a protection channel. According to the present disclosure, the network structure can be simplified and the network resources can be saved.

Abstract: The present disclosure provides a p2mp ring network protection method and device. With respect to each ring in the p2mp ring network, determining p2mp services with an identical off-ring node as a protection group; and establishing a pair of closed loop channels in opposite directions for each protection group; for each p2mp service, taking one of the closed loop channels as a working channel, and taking the other one of the closed loop channels as a protection channel. According to the present disclosure, the network structure can be simplified and the network resources can be saved.

Abstract: This invention relates to a the tip structure of a fuel injector as used in a internal combustion engine. Internal combustion engines using Homogeneous Charge Compression Ignition (HCCI) technology require a tip structure that directs fuel spray in a downward direction. This requirement necessitates a tip design that is capable of withstanding mechanical stresses associated with the design.

Abstract: This invention relates to a the tip structure of a fuel injector as used in a internal combustion engine. Internal combustion engines using Homogeneous Charge Compression Ignition (HCCI) technology require a tip structure that directs fuel spray in a downward direction. This requirement necessitates a tip design that is capable of withstanding mechanical stresses associated with the design.