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541results about How to "Improve lateral stability" patented technology

Trajectory tracking control method and control device for driverless vehicle

The invention relates to a trajectory tracking control method and a control device for a driverless vehicle. The control method comprises that error of present driving trajectory and a reference trajectory of a vehicle is calculated by a data preprocessor, a target performance indicator function which is corresponding to the present driving model is obtained simultaneously; an upper layer controller predicts driving states of the vehicle over a period of time through a vehicle dynamics model; transition switch is conducted to function parameters according to switching control algorithm, and a performance indicator function at present sampling time is obtained; optimal controlled quantity of present time is calculated by considering performance requirement constraint conditions at the same time according to predicted driving states and the performance indicator function; a lower layer controller calculates throttle opening, braking pedal pressure and steering wheel turning angle according to the optimal controlled quantity; and the control device comprises the data preprocessor, the upper layer controller and the lower layer controller. Compared with the prior art, the trajectory tracking control method and the control device for the driverless vehicle have the advantages of being good in control effect, high in practicability, capable of improving stability and safety of vehicles and the like.
Owner:TONGJI UNIV

Asymmetric truck racing tire

An improved truck racing tire includes three belts and reduced tread and undertread thickness for weight reduction. An asymmetric shoulder design is provided and circumferential grooves having wear indicia therein at a preselected depth are incorporated into the tread to divide the tread into plural ribs. Notches are formed within the tread ribs in circumferential patterns of distribution at a depth equivalent to the depth of groove tread wear indicators. The tread is constructed of a relatively softer compound in the cap and a relatively harder compound in the base. The boundary between the cap and the base is at a depth corresponding to the notch depth and the wear indicators within the grooves to provide a further indication and confirmation of wear pattern and magnitude.
Owner:THE GOODYEAR TIRE & RUBBER CO

Method for controlling traction of electric vehicle

The invention discloses a method for controlling the traction of an electric vehicle. A motor is driven by one controller; and the controller is internally provided with a finished vehicle status gain calculator, a vector controller, an error observer and an optimal slip ratio tracker. When a system operates, the finished vehicle status gain calculator analyzes the intention of a driver according to initialized vehicle information and real-time read finished vehicle status information and determines a torque gain curve, a vehicle acceleration curve and a vehicle desired speed; then the vector controller controls the motor to be up to a preset torque; next, the error observer compares the error between an actual value and a calculated value of the speed and adjusts a road condition resistance coefficient; and the optimal slip ratio tracker calculates the real-time slip ratio of the vehicle and adjusts a slip coefficient in a torque equation according to the calculated value so that the vehicle keeps in an optimal slip ratio state. By using the method, the phenomenon of slip is effectively prevented, and the acceleration performance and the side stability of the electric vehicle are improved.
Owner:GREAT WALL MOTOR CO LTD

Wall panel system

InactiveUS20020129574A1Easily and quickly reconfiguredStable structureWallsPublic buildingsWall plate
A stackable wall panel assembly including a lower wall panel having a top, a bottom, vertically extending ends and opposite sides and an upper wall panel having a top, a bottom, vertically extending ends and opposite sides. A vertically extending stanchion has a lower end connected to the top of the lower wall panel and an upper end connected to the bottom of the upper wall panel. The bottom of the upper wall panel is spaced from the top of the lower wall panel to form an open space between the upper and lower wall panels. In a preferred embodiment, a rail extends between the stanchions. Also in a preferred embodiment, a cover covers the space formed between the upper and lower wall panels. In another aspect, a second stanchion is connected to the top of the upper wall panel and a second upper wall panel is connected to the top of the second stanchion. In one preferred embodiment, draw members connect the first upper wall panel to the first stanchion and connect the second upper wall panel to the second stanchion. Alternatively, a draw block, insert and draw rod are used to connect the first upper wall panel to the lower wall panel, and to connect the first and second upper wall panels. In another aspect, a draw rod connects a lower connector post to a first upper connector post, with a spacer post disposed therebetween. A method for assembling a stackable wall panel assembly is also provided.
Owner:MILLERKNOLL INC

Collapsible canopy and framework therefor

An expandable framework is provided that can move between an expanded state in use and a collapsed state for storage. A canopy covering is supported by the framework to form an expandable canopy. The framework includes a plurality of upright support members with adjacent ones of which being interconnected by edge scissor assemblies. Upper and lower mounts are located on the support members with some of the mounts having a lobe with outwardly facing substantially parallel sidewalls. At least some of the outer ends of the scissor assemblies are provided with socket fittings that have spaced-apart portions that define a channel opening therebetween to receive a lobe in close-fitted engagement wherein at least one of the portions has a substantially flat face that forms a sliding contact surface with the lobe. A fastener secures each lobe in a respective socket for pivotal movement.
Owner:MATTHEWS JOHN T +1

Continuous flexible spacer assembly having sealant support member

A spacer and sealant assembly comprising a stretchable sealant support member having a planar surface bounded by first and second edges wherein said first and second edges have at least one pleated portion, a plastic shim having at least one undulating portion in contact with said first and second edges of said stretchable sealant support member so that said at least one pleated portion is oriented concavedly inward into said at least one undulating portion of said shim, a sealant joined to at least said first and second edges of said sealant support member.
Owner:QUANEX IG SYST INC

Horizontal splicing corrugated steel web plate combined box girder and construction method

The invention discloses a horizontal splicing corrugated steel web plate combined box girder comprising a combined box girder formed by horizontally splicing multiple precast I-shaped girder units (1); and a top plate lower edge steel plate (2-1) and a bottom plate lower edge steel plate (3-1) are respectively connected to the lower end faces of a top plate wet jointing seam (2) and a bottom plate wet jointing seam (3) of two adjacent precast I-shaped girder units (1). The construction method comprises the steps of mounting the multiple precast I-shaped girder units onto a bridge pier abutment, fixing the top plate lower edge steel plates connected with shearing force nails to the top plate wet jointing seams of every two adjacent precast I-shaped girder units, and pouring top plate wet jointing seam concrete (2-3) by taking the top plate lower edge steel plates as support templates; and then fixing the bottom plate lower edge steel plates connected with the shearing force nails to the bottom plate wet jointing seams of every two adjacent precast I-shaped girder units, and pouring bottom plate wet jointing seam concrete (3-3) by taking the bottom plate lower edge steel plates as the support templates. The horizontal splicing corrugated steel web plate combined box girder and the construction method achieve the aims of simplifying the operation process, reducing work amount, shortening construction period, reducing weight and ensuring construction quality.
Owner:HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD

Airplane with combined-wing layout of flying wing and forward-swept wings

The invention provides an airplane with a combined-wing layout of a flying wing and forward-swept wings. The airplane is characterized in that thin-wing type vertical columns A and B are additionally arranged at the 70% wingspan positions of the outer sides of two side wings of a flying-wing airplane with backward-swept wings, a thin-wing type vertical column C is additionally arranged at the tail part of the flying-wing airplane, and horizontal forward-swept wings are additionally arranged at the top ends of the three thin-wing type vertical columns A, B and C so as to form the combined-wing layout of the flying wing and the forward-swept wings; elevators are arranged on the horizontal forward-swept wings and a rudder is arranged on the vertical column C; a duct type air inlet channel is adopted on the upper wing surface of the flying wing, and cracking type drag rudders are distributed at the thin-wing type vertical columns A and B. The airplane provided by the invention has the advantages that under the condition that the structure strength is effectively guaranteed, the effective aspect ratio of the wings is increased, the induced drag is reduced, the lift-drag characteristics of the airplane are improved, the stealth performance of the airplane is improved, direct-force control of the airplane in the vertical direction is realized and the detecting accuracy under the maneuvering condition is improved.
Owner:BEIHANG UNIV
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