The invention provides a vehicle door assembly tool. The vehicle door assembly tool comprises a tool body, a framework structure arranged on the tool body, and a vehicle door clamping structure connected with the framework structure, wherein the framework structure is in lifting connection with the tool body through a lifting control assembly; and the vehicle door clamping structure is rotationally connected with the framework structure through a rotating control assembly. The vehicle door assembly tool is high in flexibility degree and can be applicable to various vehicle types, the universality of the vehicle door assembly tool is improved, and the vehicle producing cost is reduced; and the vehicle door assembly tool solves the problems that an existing vehicle door assembly tool is mainly used for a single vehicle type and low in flexibility degree.

Vehicle door assembly tool

A path tracking controller based on active disturbance rejection control(ADRC) theory is presented in this paper to solve path tracking problem in inverse vehicle handling dynamics. The basic idea behind the work is to design an active disturbance rejection controller according to yaw rate and lateral displacement during a vehicle travels along a prescribed path to generate an expected trajectory which guarantees minimum clearance to the prescribed path. Aiming at this purpose, using preview follower theory, a linear extended state observer based on lateral displacement is designed. Considering yaw angle of vehicle, a non-linear combination function combined error of lateral displacement as well as error of yaw angle is designed according to monotone bounded hyperbolic of tangent function. Finally, a real vehicle test is executed to verify the rationality of the path tracking controller. At the same time, according to characteristics of pavement file in Carsim, a 3-D virtual pavement model is established and ride comfort simulation of random pavement is carried out in the software model. The results show that the minimum lateral position error of the generated path tracking trajectory can be good indicators of successful solving of the path tracking problem in inverse vehicle handling dynamics for ADRC. More precisely, there is higher calculation accuracy for the algorithm of the ADRC to solve the path tracking problem. The study can help drivers easily identify safe lane-keeping trajectories and area.

/pdf/path-tracking-control-for-inverse-problem-of-vehicle-4c0kgkzc5d.pdf

Path tracking control for inverse problem of vehicle handling dynamics

A problem in vehicle minimum-time maneuver is the assumption that a vehicle passes through a given path in a minimal amount of time without deviating from the boundary of the given path. Vehicle ha...

Vehicle Optimal Velocity Curves for Minimum-Time Maneuver:

The invention discloses a test bench for trial-producing a vehicle body. The test bench comprises a base having a first vertical column and a second vertical column opposed to each other in the left and right direction; an overturning unit both ends of which are pivoted to the first vertical column and the second vertical column respectively; a plurality of clamping units connected to the overturning unit; a transmission unit disposed on the base and comprising a worm gear reducer and a gear transmission assembly, the worm of the worm gear reducer being fixedly connected with the driving gear of the gear transmission assembly, the driven gear of the gear transmission assembly being connected with the overturning unit to drive the overturning unit to rotate synchronously; and a braking unit arranged on the base and switchable between a locking mode for braking a driving mechanism and a unlocking mode for disengaging from the drive mechanism. The test bench can fix a vehicle body, facilitates the overturn of the vehicle body to an appropriate angle and the installation of components and parts on the vehicle body.

Test bench for trial-producing vehicle body

Methods and systems are provided for cylinder valves of an internal combustion engine. In one example, a valve assembly may include a poppet valve and a valve spring. The valve spring includes a plurality of legs adapted to engage with an annular groove of the valve spring in order to couple the valve spring to the poppet valve.

Internal combustion engine comprising a valve train with valve springs and method for mounting such a valve spring

Vehicle driving safety is the urgent key problem to be solved of vehicle independent development while encountering emergency collision avoidance with high speed. And it is also the premise and one of the necessary conditions of vehicle active safety. A new technique for vehicle handling inverse dynamics which can evaluate the emergency collision avoidance performance is proposed. Firstly, the steering angle input of 3-DOF vehicle mode is established. The steering angle input imposed by driver is the control variable, and accurately tracking the expected path was the control object. The optimal control problem can be converted into a nonlinear programming problem while using the state variables conversion, which was solved by the sequential quadratic programming (SQP) algorithm. The results show that vehicle can well track the expected path in high speed.

/pdf/research-on-vehicle-handling-inverse-dynamics-based-on-20i6ec7s7w.pdf

Research on vehicle handling inverse dynamics based on optimal control while encountering emergency collision avoidance

The utility model relates to a fixing overturning frame for green disassembly of a scrapped automobile. The fixing overturning frame comprises a bottom plate, a distribution box, an overturning device and a clamping device, wherein the distribution box is fixed to the bottom plate; the distribution box is electrically connected with the overturning device and the clamping device; the overturning device comprises a supporting frame, a motor, a transmission gear and a worm and worm wheel, wherein the supporting frame is fixed to the bottom plate; the motor drives the worm and worm wheel to rotate through the transmission gear; the clamping device comprises a supporting plate, a hydraulic pump, a rotating shaft and a clamp; the supporting plate is fixed to the bottom plate; the rotating shaft is rotatably arranged on the supporting plate; the clamp is fixed to the rotating shaft; the hydraulic pump is fixed to one side of the supporting plate; the hydraulic pump is connected with the clamp; an overturning gear is arranged on the rotating shaft and is connected with the worm and worm wheel. The fixing overturning frame for the green disassembly of the scrapped automobile can be adjusted quickly and fixed and overturned reliably according to different types and different specifications of the scrapped automobiles, so that high efficiency and safety of subsequent disassembly are ensured.

Fixing overturning frame for green disassembly of scrapped automobile

The utility model relates to an elevating platform for disassembling door, including base, stand and lifting unit, the stand vertical fixation is on the base, lifting unit includes trailing arm, anchor clamps, motor, hydraulic pump and pneumatic cylinder, the pneumatic cylinder is fixed in the stand, the piston rod fixed of trailing arm and pneumatic cylinder, motor and hydraulic pump are fixed in stand one side, and the hydraulic pump passes through the motor to be connected with the pneumatic cylinder, and the hydraulic pump passes through that the pneumatic cylinder fuel feeding is given to the motor so that trailing arm rising or decline, the draw-in groove has been seted up on the trailing arm, fixture set is in draw-in groove one side. This an elevating platform for disassembling door can be according to the abandoned car of different motorcycle types, and the not unidimensional door of different specifications goes on fixedly fast going up and down to it, and the commonality is strong, improves the efficiency of abandoned car recovery work, lightens artifical intensity of labour, increases the rate of recovery of spare part.

A elevating platform for disassembling door

The invention discloses a crankcase ventilating and cleaning device and belongs to the technical field of gasoline direct injection engines. The crankcase ventilating and cleaning device comprises a crankcase, an air cylinder body, an air cylinder cover, a fuel injector, a high-pressure fuel passage, an fuel tank and a fuel pipe; the side wall of the crankcase is provided with an exhaust pipe withis connected with the inlet of an air pump; the inner cavity of the air pump is divided into a left cavity and a right cavity through a separating plate; a left impeller and a right impeller are mounted inside the left cavity and the right cavity respectively, the left impeller is fixedly connected with a first gear shaft, which rotates through a first bearing and is assembled at one end inside afirst through hole of the separating plate, and the right impeller is fixedly connected with a second gear shaft, which rotates through a second bearing and is assembled at the other end inside the first through hole of the separating plate; a sealing piece is mounted between the first gear shaft and the second gear shaft and isolates the left cavity and the right cavity in a sealed mode. The crankcase ventilating and cleaning device solves the problems of carbon deposition on a throttle valve and the inner wall of an air inlet pipe and engine oil droplet deposition on the inner wall of an air pump and a left impeller in a direct injection engine.

Crankcase ventilating and cleaning device

The invention relates to the technical field of internal combustion engines, in particular to a camshaft-free gas distribution mechanism based on piezoelectric unit parts driving internal combustion engine valves. The camshaft-free gas distribution mechanism comprises a driving device, an executive device, a valve chamber cover and an air cylinder. The driving device is mounted in the valve chamber cover. The executive device is mounted in the air cylinder. The valve chamber cover is fixed to the top of the air cylinder. The driving device is connected to the upper portion of the executive device through the valve chamber cover. According to the design, the piezoelectric unit parts are used as the driving device of an executor; through combination of the valve chamber cover and the air cylinder, the driving device and the executive device are mounted and connected; the valves are driven to open and close under the effect of the piezoelectric unit parts; because the response speed of the piezoelectric unit parts is high, the control response speed of an engine during high-speed running is satisfied, and the control precision and control reliability are greatly improved. Meanwhile, a hydraulic circuit is omitted, the camshaft-free gas distribution mechanism is simpler in structure, the structural arrangement is more convenient, and the portability will be higher.

Hang Weixing

Papers

Research on vehicle handling inverse dynamics based on optimal control while encountering emergency collision avoidance

Fixing overturning frame for green disassembly of scrapped automobile

A elevating platform for disassembling door

Crankcase ventilating and cleaning device

Camshaft-free gas distribution mechanism based on piezoelectric unit parts driving internal combustion engine valves