14results about How to "Ensure handling stability" patented technology

The invention relates to the technical field of vehicle engineering and automatic control, in particular to an AMPC control method for a hub motor suspension system of an electric vehicle. The method comprises the following steps: S1, obtaining pavement preview information; s2, inputting road excitation in the information into a prediction model, and outputting dynamic response of the hub motor suspension system; s3, generating a control signal based on an adaptive model prediction control method; and S4, adjusting the dynamic response by using a control signal. By means of the method, the hub motor suspension system can perceive the road condition in advance through the road surface preview information, control signals are generated and hub motor input and suspension parameters are adjusted in combination with the AMPC method, the response speed, stability and comfort of the system are improved, and therefore the control requirements under different road conditions are met.

The invention discloses a bone wax conveying system and method.The bone wax conveying system comprises an injection gun and a wax storage box detachably arranged on the injection gun, and the wax storage box comprises a connector device and bone wax pre-poured into the connector device. The wax storage box and the injection gun are detachably arranged, an operator can replace the connector device for multiple times when executing work, and the connector device can be replaced by multiple times in an endoscopic surgery or a UBE surgery by adjusting the hardness of bone wax and the connector length of the wax storage box. The injection gun can push bone wax in the connector device out to a bone wound part needing hemostasis at room temperature with preset injection force, the injection process is easier, the wax output amount is convenient to control, the problems that an endoscope inner cavity is polluted by the bone wax and a traditional injection system needs to be additionally provided with a complex heating structure are solved, and the injection efficiency is improved. Bone wax conveying and the whole operation efficiency are greatly improved.

A method, device, readable storage medium and electronic device for controlling vehicle path tracking, the method comprising: determining the data packet receiving state of a predefined state variable according to real-time sensor data collection; determining whether the vehicle is under network attack at the current moment according to the data packet receiving state of the state variable at the current moment; if so, calculating the value of the control variable at the previous moment according to the data of the state variable at the previous moment; calculating the estimated value of the state variable at the current moment according to the calculated value of the control variable using the state estimation equation, and performing vehicle path tracking control according to the estimated value. The present invention can improve the network information security of intelligent networked vehicles, so that the vehicle still has a certain fault tolerance when encountering a network attack, and improves the path tracking performance of the vehicle.

The invention discloses a control device and method for recognizing double-front-axle tire gnawing, and relates to the technical field of vehicle tire gnawing detection and control. A first-axle rotation angle and a second-axle rotation angle are obtained through a controller, and whether a tire gnawing phenomenon exists in a vehicle or not is judged according to the first-axle rotation angle and the second-axle rotation angle; when a tire gnawing phenomenon exists in the vehicle, a tire gnawing signal is sent to the ADAS controller; a whole vehicle steering angle is obtained through an ADAS controller according to the tire gnawing signal, a vehicle axle with the tire gnawing phenomenon is judged according to the whole vehicle steering angle, a first axle steering angle and a second axle steering angle, a correction angle value is calculated, and the correction angle value is sent to the controller; angle correction control is conducted on the automobile axle with the tire gnawing phenomenon through the controller according to the correction angle value, and tire gnawing control over the automobile axle with the tire gnawing phenomenon is achieved. The tire gnawing phenomenon of the vehicle can be recognized and controlled, so that the vehicle using cost is reduced, and the operation stability and comfort of the vehicle are guaranteed.

The invention provides a vehicle steering auxiliary control method, system and device and a medium. The method comprises the steps of obtaining driving data of a vehicle on a current road; determining a pavement adhesion coefficient of the current road according to the driving data; determining a front wheel superposition torque and a rear wheel rotation angle of the vehicle according to the road adhesion coefficient and the driving data; and cooperative control torque is determined according to the front wheel superposition torque and the rear wheel rotation angle, and steering auxiliary control is conducted on the vehicle. The front wheel superposition torque and the rear wheel rotation angle adaptive to the road surface conditions are calculated for different road surfaces through the road surface adhesion coefficient, cooperative control is performed based on the front wheel superposition torque and the rear wheel rotation angle, and the overall operation stability and safety of the vehicle are guaranteed.

The invention discloses an intelligent fusion navigation filtering method and system for complex environment transition. Navigation data and environment data are collected by a sensor arranged on ocean equipment, preliminary navigation state estimation is obtained after the navigation data passes through a strapdown inertial navigation module, and local error state estimation and filter health degree are obtained after the navigation data and the navigation data are input into a parallel sub-filter; combining the navigation data and the environment data with the health degree of the filter to serve as fusion data, inputting the fusion data into a reinforcement learning agent to obtain a dynamic fusion weight, performing weighted fusion on the plurality of local error state estimations by using the dynamic fusion weight, and superposing the fusion data on the initial navigation state estimation to generate a final navigation result. According to the method, the optimization mapping relation between the environment characteristics and the filtering weight is directly learned through the reinforcement learning agent, integrated self-adaptive adjustment from environment perception to fusion decision is achieved, and the estimation precision and robustness of a navigation system in dynamic complex environments such as a bay-ocean transition section are effectively improved.

This invention provides a method, apparatus, equipment, and storage medium for assessing traffic resilience and delay costs under rainfall-induced urban flooding. The method includes: acquiring rainfall data for a target area; performing runoff generation and confluence simulations based on the rainfall data to obtain the water depth; determining a safe driving speed corresponding to the water depth based on the water depth and a speed-depth mapping model; the speed-depth mapping model determining a safe driving speed while ensuring vehicle handling stability, wherein the safe driving speed is obtained based on the road water depth and a scaling factor; obtaining a travel demand matrix based on the spatial distribution of the population in the target area; determining traffic delay time based on the safe driving speed and the travel demand matrix; and obtaining traffic delay costs based on the traffic delay time. This invention can improve the efficiency and accuracy of assessing traffic resilience and delay costs under rainfall-induced urban flooding.

The present disclosure relates to the technical field of semiconductor, and provides a transfer device, which comprises a base, a mechanical arm arranged on the base and formed with a clamping space for grabbing a workpiece, and a fixing assembly arranged on the mechanical arm and comprising a telescopic piece telescopically arranged relative to the mechanical arm and formed with a circumferential closed space for wrapping the workpiece to fix the workpiece. The workpiece is clamped by the clamping space of the mechanical arm and secondarily fixed by the telescopic piece of the fixing assembly, so that the workpiece can be efficiently carried and the carrying stability of the workpiece can be ensured.

The invention provides a tire capable of maintaining steering stability and improving noise performance. A tire is provided with a tread portion (2). The first land portion (7) is provided with a plurality of first lateral grooves (11), and the second land portion (8) is provided with a plurality of second lateral grooves (12). The plurality of first lateral grooves (11) are arranged in a first layout throughout the circumference of the tire. In the first layout, the first lateral grooves (11) are arranged such that the first pitch (P1) of the first lateral grooves (11) becomes a type number a, and in the paired first lateral grooves (11), the first ends (11a) are provided at the same position in the tire circumferential direction as the second ends (11b). The plurality of second lateral grooves (12) are arranged in a second layout. In the second layout, the second lateral grooves (12) are arranged so that the second pitch (P2) of the second lateral grooves (12) becomes the number b of types, and the number b of types of the second pitch (P2) is greater than the number a of types of the first pitch (P1).

This utility model discloses a rebound hammer for non-destructive testing of UHPC compressive strength, belonging to the field of concrete engineering testing technology. It includes a hollow shell, an impact rod, an impact hammer, an impact spring, a guide rod, a hook assembly, and a switch. The impact rod is telescopically connected to one end of the shell. One end of the impact spring is fixed, and the other end is connected to the impact hammer. Both the impact hammer and the hook assembly are slidably connected to the guide rod. The hook assembly can slide along the guide rod and engage with the impact hammer. The switch controls the release of the impact hammer by the hook assembly. The free length of the impact spring is 134.4±0.5mm, and the impact length after stretching is 140.0±0.5mm. The wire diameter of the impact spring is greater than 1.5mm. The UHPC compressive strength regression equation is: ; the value of c ranges from -0.001 to -0.004, where is the average rebound value of the test area or specimen, is the average carbonation depth of the test area, and is the converted value of concrete strength in MPa. This enables non-destructive testing of the compressive strength of UHPC.

The present invention relates to a method and system for rapid access to a large-scale swarm of decentralized same-frequency networks, comprising the following steps: after the swarm is formed, a three-dimensional networking topology diagram of the swarm is generated; when a drone in the swarm in flight needs to be accessed, the swarm formation is controlled, and the drone to be accessed is moved to a set coordinate position; multiple drones are selected for network connection with the drone to be accessed; the backup connection positions of the selected drones are enabled, a networking module of the selected drone generates a network hotspot, and the drones are matched and screened through identification information; a network connection is established for the successfully matched and screened drones through a networking module; while supporting the decentralized networking of the drones in the swarm, the swarm can also be enabled to quickly access the drones in flight, and the distribution position identification and layout functions of the newly accessed drones are provided to ensure the control stability of a new swarm formed after the drones are accessed.

The invention provides a novel full-active hydraulic suspension system and a vehicle, the novel full-active hydraulic suspension system comprises a shock absorber assembly and an electric pump assembly, the shock absorber assembly comprises a left shock absorber and a right shock absorber, and upper and lower cavities of the shock absorbers are respectively communicated with a shock absorption damping valve; the electric pump assembly comprises a motor and a duplex gear pump, the duplex gear pump comprises two hydraulic pumps sharing one driving shaft, and an output shaft of the motor is in transmission connection with the driving shaft; an oil inlet and an oil outlet of each hydraulic pump are respectively connected with two vibration reduction damping valves of one vibration damper through electromagnetic reversing valves, and are communicated with hydraulic oil ways between upper and lower cavities of the vibration dampers and the hydraulic pumps; the hydraulic oil way is connected with an energy accumulator. By the adoption of the technical scheme, automobile driving smoothness and handling stability can be guaranteed, and the chassis space occupied by the suspension system is reduced.