43 results about "Cornering force" patented technology

Provided is a non-pneumatic wheel (100) for a vehicle, and a wheel (100), suspension (200; 200-1), and tire (300) used therein that are capable of ensuring driving stability because there is no air chamber between a wheel (100) and a tire (300) to blowout. They are also capable of ensuring good road holding, preventing standing waves, reducing brake fade and cornering force, providing good handling and ride comfort, staying quiet when rolling, and are economical and environmentally friendly. The non-pneumatic wheel (100) includes a wheel (100), a shock absorbing member (220; 220-1) coupled to an outer periphery of the wheel (100) and absorbing or attenuating noise and vibration due to external shock, a plurality of resilient members (230; 230-1; 230-2) arranged around and coupled to an outer periphery of the shock absorbing member (220; 220-1) in a radial direction and having a plurality of resilient rings (230-1a) that are resiliently deformed in response to an external force, resilient links (240) respectively coupled to the resilient rings (230-1a) to evenly transmit external shock to the resilient rings (230-1a), rail plates (270) to which sliders (261) formed at both ends of the resilient links (240) are slidably coupled, and a tire (300) having a plurality of coupling grooves (321) formed along an inner periphery such that the rail plates (270) are inserted into the coupling grooves (321).

The invention discloses a trajectory tracking control method used for a driverless vehicle. The method includes the following steps that the current position point of a vehicle body is confirmed according to a reference trajectory; a matching point nearest to the current position point of the vehicle is found, and the road curvature of the nearest matching point is obtained according to a two-point curvature obtaining method; according to the current position point of the vehicle and the nearest matching point, a trajectory tracking error is obtained through calculation and comprises a transverse error and a head pointing error; a dynamic model feeding back cornering force on the basis of front wheels is established, and the optimal feedback control rate is obtained by the adoption of an LQR control algorithm; and the cornering force of the front wheels is determined, a front wheel slip angle is obtained on the basis of a reverse tire model, and then the steering wheel angle controlledquantity is obtained and issued to a steering-by-wire system to achieve trajectory tracking control. By the adoption of the method, the stability of trajectory tracking control of the driverless vehicle is improved, the trajectory tracking accuracy is improved, the tire slip angle is restrained, and the possibility that the tire force of the vehicle is saturated under an extreme working conditionand therefore the vehicle loses stability is avoided.

The invention discloses a method for controlling the stability of a vehicle based on vertical load distribution of a tire. The control method comprises the following steps of: 10, giving steering input out by a driver, estimating motion state information and ideal state information of the vehicle by using a finished vehicle model and a finished vehicle reference model, and judging whether the vehicle is positioned in a stable state or not by the comparison of vehicle information; 20, inputting tracking errors of the vehicle into a proportion integration differentiation (PID) controller, and acquiring an active force feedback of a suspension frame by a corresponding PID control algorithm; and 30, after feedback control is received by the vehicle, redistributing a vertical load of the tire of the vehicle to generate calibration yawing moment so as to restrain the sideslip of the vehicle and improve the stability of the vehicle. In the method, the vertical load of the tire is distributed by the active force of the suspension frame; the calibration yawing moment is generated due to a nonlinear coupling relationship between the vertical load of the tire and cornering force; therefore, yawing motion of the vehicle is controlled, the sideslip of the vehicle is restrained, and the lateral stability of the vehicle is improved.

By bending and stretching a link mechanism, both left and right wheels of a vehicle can be inclined toward inside of cornering to generate a camber thrust as a lateral force, i.e. an increase in cornering force. Further, by bending and stretching the link mechanism, the passenger compartment can be inclined in accordance with inclination of a connecting link, and thus the center of gravity of the vehicle can be moved toward its inner wheel during cornering. By preventing lifting of the inner wheel during cornering, cornering performance is improved. Because the passenger compartment is inclined toward the inner wheel during cornering, centrifugal force is less likely to be felt by the occupant.

In wheel ground-contact state judging device and method, a detector directly detects a lateral force acting in a direction perpendicular to the wheel center plane of a wheel. An acceleration sensor detects an acceleration in the lateral direction of a vehicle. A calculator calculates a cornering force acting on each wheel on the basis of the acceleration in the lateral direction thus detected. A judging unit compares the detected lateral force with the calculated cornering force to judge whether the ground-contact state of the wheel is good or not.

The invention discloses a method for calculating a vehicle steering resistance moment considering the friction between a tire and a road surface. A vehicle steering resistance moment model is established and verified by calculating a tire/road in-place steering friction moment and a return moment generated by an inclination angle of a kingpin. By calculating the friction torque of tire/pavement low-speed steering and the rectifying torque of kingpin inclination angle, kingpin back inclination angle and tire towing distance, the model of vehicle low-speed steering resistance torque is established and verified. Based on this method, by taking into account the friction between the tire and the pavement, not only the relationship between the steering resistance torque described by the existingempirical formulas, the front axle load and the tire pressure is included, but also the influence of the inclination angle of the kingpin and the wheel steering angle on the steering resistance torque is considered, at the same time, the variation relationship of the low speed steering friction torque along with the vehicle speed and the correspondance relationship between the tire cornering force, the tire return torque and the vehicle speed and the wheel steering angle can be easily found out. The calculation method is more accurate.

A vehicle-dynamics control method and system for a vehicle train comprising a tractor vehicle and a trailer vehicle. The vehicle-dynamics control system provided in the tractor vehicle, on the basis of vehicle-dynamics signals measured in the tractor vehicle, delivers brake-demand values (BAW) to the trailer vehicle. The trailer vehicle is equipped with a brake system, in which the brakes of the trailer vehicle can be actuated on the basis of the BAW. The vehicle-dynamics control method and system use data signals received from the trailer vehicle and calculates the BAW and permits activation of the brake system of the trailer vehicle while at the same time avoiding an undesirably large reduction of the cornering forces on the wheels of the trailer vehicle.

The invention provides a linear compressor. The linear compressor comprises a shell, a mover, a stator, an air cylinder, a piston, springs and a spring pressure plate, wherein the mover, the stator, the air cylinder, the piston, the springs and the spring pressure plate are arranged in the shell. The stator forms a magnetic field space. A magnetic body is arranged on the mover and inserted into the magnetic field space. The spring pressure plate and the air cylinder are correspondingly fixed to the two sides of the stator. The mover is located between the spring pressure plate and the stator. The springs are arranged between the mover and the spring pressure plate and arranged between the mover and the stator. The piston comprises a piston head and a piston rod which are connected together. The piston head is slidably arranged in the air cylinder. The piston rod is fixedly connected with the mover. A supporting sleeve is arranged on the spring pressure plate. The free end of the piston rod is slidably arranged in the supporting sleeve. The two sides of the piston are supported through the air cylinder and the supporting sleeve, the situation that the piston generates cornering force due to the weight of the mover is avoided, and the reliability of linear compressor is improved.

A method of calculating a cornering force to be applied to each wheel provided to a vehicle which is cornering, comprising the steps of: obtaining a magnitude of a centrifugal force to the vehicle in a direction substantially orthogonal to a vehicle traveling direction, a contact length of each wheel during the cornering of the vehicle, and an amount of deformation in a wheel width direction at the contact portion of each wheel of the vehicle, calculating a difference between the obtained amount of the deformation and an amount of deformation in the wheel width direction under a straight forward travel condition of the vehicle for each wheel, and calculating a cornering force for each wheel based on the magnitude of the centrifugal force, the contact length, and the difference between amounts of deformation in the wheel width direction.

A system and a method for determining when to update a surface estimation value indicative of a condition of a roadway surface are provided. The method includes determining a front axle cornering force error value based on a predicted front axle cornering force value and a first front axle cornering force value. The method further includes determining a threshold yaw rate error value based on the front axle cornering force error value. The method further includes indicating that the surface estimation value is to be updated when a yaw rate error value is greater than the threshold yaw rate error value.

The invention belongs to the technical field of wood processing and relates to a tenoning assist mechanism comprising a U-shaped bench rack, a first mechanism and a second mechanism. The U-shaped bench rack providing a workpiece with side clamping force is used for supporting the workpiece. The first mechanism is used for providing side clamping power. The second mechanism is used for providing top clamping power. The first mechanism and the second mechanism are arranged on two vertical sides of the U-shaped bench rack. The first mechanism and the second mechanism providing the side clamping force and top clamping force respectively are applied to replace existing simple clamping structures, the whole structure is compact, the center of gravity of the tenoning assist mechanism is lowered, the first mechanism, the second mechanism and the U-shaped mechanism co-act to provide the top compressing force, side compressing force and corner force to clamp the workpiece, and tenoning precision is improved.

The invention relates to an elastic coupling bogie of a double-connecting-rod coupling straddling type monorail vehicle. Each single-axle bogie comprises a framework, walking wheels, guide wheels andstabilization wheels, the walking wheels, the guide wheels and the stabilization wheels are installed on the corresponding frameworks, each framework comprises a side beam, a crossbeam and a verticalcantilever beam, two elastic connecting rods are further arranged, and the two single-axle bogies are connected with each other through the two elastic connecting rods arranged in parallel. Compared with the prior art, the elastic coupling bogie can make the two single-axle bogies located in the radial positions of a circular curve, the radial force of guide tires is reduced, the vehicle curve passing safety is improved, the cornering force of walking tires is reduced, and the eccentric wear of the walking tires is reduced.

The invention relates to a tenoning clamping mechanism, and belongs to the technical field of wood industry processing. The tenoning clamping mechanism comprises a worktable frame, a pressing plate, a first air cylinder and a second air cylinder, wherein the worktable frame is used for supporting a tenoning workpiece, the pressing plate is integrally formed, and is used for providing upward pressing force and lateral pressing force for the tenoning workpiece, the first air cylinder and the second air cylinder are used for providing pressing power, the worktable frame is in an L shape, the longitudinal edge of the worktable frame is provided with a movable area, an air cylinder shaft of the first air cylinder transversely penetrates through the movable area and is connected with the pressing plate, the second air cylinder is arranged at the longitudinal edge of the worktable frame, an air cylinder shaft of the second air cylinder longitudinally acts on the shaft of the first air cylinder, and the first air cylinder and the pressing plate are moved along the longitudinal axis direction of the movable area. The tenoning clamping mechanism has the advantages that the structure is simple; by arranging the integral forming pressing plate, the number of pressing plates is reduced, the operation of operators is convenient, the upward pressing force, lateral pressing force and edge and corner force are simultaneously provided, the tenoning workpiece is clamped, and the tenoning accuracy is provided.

The fuel efficiency can be improved, and the braking performance and cornering performance can be improved. A vehicle body (11), front wheels and rear wheels rotatably arranged with respect to the body (11), and a wheel drive unit (31) arranged between the rear wheels and the body (11) and imparting a camber angle to the rear wheels , 32). The coefficient of friction between the tires of the rear wheels and the road surface is smaller than the coefficient of friction between the tires of the front wheels and the road surface. Since the coefficient of friction between the respective tires of the rear wheels and the road surface is smaller than that between the respective tires of the front wheels and the road surface, fuel efficiency can be improved. In addition, since the coefficient of friction between each tire of the front wheels and the road surface is large, acceleration and braking performance can be sufficiently improved. In addition, since the rear wheel is provided with a camber angle, a lateral force can be generated, a lateral resistance force can be generated, and turning performance can be improved.

The roll induces four wheel steering vehicle employs a frame system to protect the driver and serves as an attachment point for, independent suspension links pivotally connect to the wheel assemblies enabling four wheel independent suspensions. A mechanically manipulated centrally mounted steering and suspension pivot, provides both steering control and suspension attachment for the shock and spring. The device is controlled by the driver using typical steering wheel and pedal movement. Steering movement by the driver produces proportionally appropriate camber, steering angle, and roll simultaneously. The invention provides a feeling of integration with the vehicle as the driver rolls into turns with the vehicle, while minimizing fatigue caused by the continuous resistance to centrifugal cornering forces.