4879 results about "Steering system" patented technology

An agricultural vehicle may include a propulsion system, a steering system, and a vehicle controller. An agricultural vehicle may include a camera sensor having a camera field of view (CFOV), a light detection and ranging (LiDAR) sensor having a LiDAR field of view (LFOV), and an imaging controller in operable communication with the camera sensor and the LiDAR sensor. The imaging controller may include a processor and at least one non-transitory computer-readable storage medium having instructions store thereon that, when executed by the at least one processor cause the imaging controller to, at least, receive image data, segment the image data, fuse LiDAR data and the image data, create a fused instance including depth information; and provide at least the fused instance to the vehicle controller, wherein the vehicle controller is configured to provide at least one navigational command based at least partially on the fused instance.

An agricultural vehicle includes a propulsion system configured to move the agricultural vehicle, a steering system configured to orient the agricultural, a navigation controller operably coupled to the propulsion system and the steering system, and a camera and a radar operably coupled to the agricultural vehicle. A computing device is operably coupled to the radar and the camera and includes instructions that, when executed by at least one processor, cause the computing device to receive image data from the camera, receive radar data from the radar and generate a radar point cloud based on the radar data, identify one or more objects in the image data using a trained neural network to generate labeled image, fuse the labeled image data with the radar point cloud to obtain fused data, and perform one or more navigation operations based on the fused data. Related agricultural vehicles and methods are also disclosed.

An electric power assisted steering assembly comprises a steering mechanism which operatively connects a steering wheel to the roadwheels of a vehicle, a torque sensing means adapted to produce a first output signal indicative of the torque carried by a portion of the steering mechanism, a means for producing a second output signal indicative from a signal indicative of the angular velocity of the portion of the steering mechanism, an electric motor operatively connected to the steering mechanism, a signal processing unit adapted to receive the two output signals and to produce therefrom an overall torque demand signal representative of a torque to be applied to the steering mechanism by the motor, and a motor drive stage adapted to provide a drive current to the motor responsive to the torque demand signal. The overall torque demand signal includes a damping component that is dependent upon the second output signal. The means for producing the yaw damping component includes a filter having one pole and one zero, and in use the second signal is passed through the filter to produce the damping component, the frequency of the pole and zero being selected such that the filter provides a band between the pole and zero within which the phase of the filtered second signal and the velocity signal are further out of phase or in phase than within the band.

A catheter includes a handle and an elongate member extending from the handle. The catheter may also include steering system coupled to the handle. The steering system may be configured to deflect at least a portion of the elongate member in at least one direction. The catheter may also include a locking mechanism configured to lock the portion of the elongate member in a deflected configuration, and a lever coupled to the handle. The lever may be configured to move from a first position to a second position to engage the locking mechanism. The lever may also be configured to be separably retained at least at one of the first position or the second position to prevent movement therebetween.

A method for cooperative vehicle operation includes receiving a first target angle signal associated with a handwheel of a vehicle, receiving a second target angle signal associated with an autonomous steering system of the vehicle, and, in response to a determination that a handwheel angle error between the first target angle signal and the second target angle signal is less than a handwheel error threshold: generating a handwheel motor torque command based on a position control motor torque command and a torque control motor torque command; and controlling a position of the handwheel of the vehicle based on the handwheel motor torque command.

Disclosed in the present application are a corner module and a vehicle, the corner module comprising a suspension system and a steering system, wherein the steering system comprises a steering power assembly, a steering execution assembly and a steering transmission assembly; the steering execution assembly comprises a first steering knuckle and a second steering knuckle, wherein the first steering knuckle is arranged on a traveling system, and the first steering knuckle is connected to the steering transmission assembly; the second steering knuckle is connected to the suspension system; and the first steering knuckle is movably connected to the second steering knuckle, such that the first steering knuckle turns around a movable connection point of the first steering knuckle and the second steering knuckle. In the corner module, decoupling of a steering axis from the suspension system is achieved, the position of the movable connection point is conveniently configured to form a more rational steering axis, the degree of design freedom is increased, the steering performance is better considered, excessive constraint on the degree of freedom of the traveling system is avoided to a certain extent, and motion interference between the steering system and the suspension system is reduced, thereby improving the flexibility, safety and stability of the steering system of the corner module.

The invention discloses a steering device, a steering system and a vehicle, relates to the technical field of vehicles, and aims to solve the problem of how to reduce the space of a driving position occupied by a steering wheel. The steering device comprises a steering wheel, the steering wheel comprises a folded state and an unfolded state, and the steering wheel is configured to enable the steering wheel to be switched from the unfolded state to the folded state through folding action. When the vehicle is in a first driving state, the steering wheel is in an unfolded state, and the first driving state is a state that the vehicle is in a driving state and auxiliary driving of the vehicle is not started.

The invention relates to an automatic driving vehicle steering and suspension cooperative control method based on reinforcement learning, and the method specifically comprises the following steps: 1, building a dynamic model of a vehicle steering system and a suspension system, and obtaining transverse and vertical vehicle motion states through controlling a steering angle and a suspension acting force; 2, constructing a control action and reward function of a vehicle steering system and a suspension system, and forming a reinforcement learning exploration strategy of vehicle steering and suspension cooperative control; 3, constructing intelligent agents of a steering system and a suspension system; and 4, constructing a reinforcement learning environment, and realizing cooperative control of the steering system and the suspension system through a multi-agent reinforcement learning method. According to the method, different vertical and transverse plane environments and different learning tasks are comprehensively considered, the data input dimension is reduced, the optimal motion control strategies under different working conditions are considered, and on the premise that accurate path tracking is guaranteed, the transverse roll stability and the vertical smoothness and comfort are improved through cooperative steering system and suspension system control.

Electro-Hydraulic Steering System and Method An electro-hydraulic steering system (1) includes a steering wheel (2) for setting a steering demand and a hydraulic steering actuator (11) for turning the steered wheel in response to the steering demand. An electrically controlled hydraulic valve (26) is arranged to supply pressurised fluid to the hydraulic steering actuator to turn the steered wheel according to a variable steering ratio. An electronic control unit (21) receives an angular position of the steering wheel and an angular position of the steered wheel. The control unit is operative to determine an angular misalignment between the steering wheel and the steered wheel and carry out a realignment procedure. The realignment procedure comprises calculating a compensation angle based on the angular misalignment and controlling the steering ratio based on the compensation angle by controlling the hydraulic valve to adjust the supply of pressurised fluid to the hydraulic steering actuator.

The invention provides a dynamic fault-tolerant control method based on an expected function safety mechanism, and the method comprises the steps: 1, selecting the model of a sensor, and enabling the sensor to be distributed at the periphery of a vehicle body; 2, building a decision algorithm model, carrying out environment scene recognition, planning a driving path and speed according to data obtained by a sensing layer, evaluating safety risks of different decisions, and carrying out judgment and decision making on various conditions; 3, control interfaces of a vehicle power system, a steering system and a braking system are established, and the electronic control unit converts a decision control instruction output by the decision algorithm model into actual vehicle operation through the control interfaces; 4, performing an expected function safety mechanism, performing real-time monitoring on state parameters of the vehicle, and analyzing detection data through a fault detection algorithm; 5, implementing a fault tolerance strategy; and 6, continuously monitoring the actual driving state and the system response condition of the vehicle, and adjusting the fault tolerance strategy.

The invention provides a steering control method and equipment for a four-wheel independent driving and steering electric automobile, and belongs to the field of automobile steering. When the fault detector detects that the steering actuator breaks down, the fault state at the moment is quantified and transmitted to the self-adaptive fault-tolerant controller in real time, and the fault-tolerant controller calculates the needed additional yawing moment according to the current residual state of the steering actuator and the driving state of the vehicle; and then the vehicle steering function is jointly completed through hub motor differential drive and a residual steering actuator, and if the vehicle cannot be kept in a stable area after the steering actuator breaks down, steering degradation and parking processing are conducted. According to different failure types of the steer-by-wire system, vehicle steering can be completed through differential drive of the four-wheel hub motor and the residual steering actuator, and the cost is reduced while it is guaranteed that the vehicle has the steering function.

The invention relates to the technical field of steering systems, in particular to an angle control method for smooth angle response and rapid intervention. An angle control method for smooth angle response and rapid intervention comprises an angular velocity feed-forward PID algorithm, and the angular velocity feed-forward PID algorithm comprises the steps that the difference between a request angle and an actual angle is obtained to obtain an angle difference, the angle difference is subjected to the PID algorithm to obtain target motor torque, the target motor torque is converted into actually-executed motor torque through gradient output, and a steering wheel is controlled to rotate. The method is characterized in that the angle smooth response comprises a low-frequency compensation strategy and a high-frequency compensation strategy. Compared with the prior art, the angle control method for smooth angle response and rapid intervention is provided, the torque of the motor is calculated by adopting an angular velocity feed-forward PID algorithm, a low-frequency and high-frequency compensation strategy and a rapid intervention strategy are introduced, and the purpose of controlling a steering wheel to smoothly and rapidly reach a target angle can be achieved.

A steering system includes a steering wheel rotation limiting device being arranged radially offset to the steering wheel hub and including a base being fixed to the or another non-rotatable component of the steering system and a sliding element. The base includes two opposing end stop surfaces, and the sliding element is axially slidable parallel to the axis of rotation relative to the base and relative to the steering wheel hub between the two opposing end stop surfaces. The sliding element includes a projection that engages a spiral groove formed on a circumferential surface of the steering wheel hub so that rotation of the steering wheel hub causes axial movement of the sliding element, and so that abutment of the sliding element with one of the two end stop surfaces blocks movement of the sliding element and rotation of the steering wheel hub.

The invention discloses a distributed driving electric vehicle path tracking control method, system and device, and relates to the technical field of vehicle chassis control. The method comprises the steps that vehicle parameter information is received, a vehicle dynamics model and a magic formula tire model are constructed according to the vehicle parameter information, and a vehicle-road system model used for trajectory tracking control is constructed based on the vehicle dynamics model and the magic formula tire model. According to the method, various uncertain disturbances in the vehicle driving process are comprehensively considered, a model predictive control framework based on minimum-maximum robustness is designed, and the robustness of a path tracking control system is enhanced; meanwhile, an online observer based on a minimum robust positive invariant set is designed, real-time and accurate obtaining of key parameters of the vehicle is achieved without increasing hardware cost, meanwhile, an active front wheel steering and torque vector cooperative control method is designed, and coordinated operation between a steering system and a four-wheel drive system is achieved.

The invention discloses an intelligent emergency control system of an arrangement ship steering oar, and belongs to the technical field of arrangement ship steering oar control. An intelligent emergency control system of an arrangement ship steering oar comprises a main control module, a steering oar driving module and a steering oar control module. The problem that in the prior art, when a main steering system breaks down, a ship is prone to being out of control, colliding or other safety accidents are caused is solved, the steering oar driving module is used for conducting driving operation on the arrangement ship steering oar in an emergency mode, the state of the arrangement ship steering oar is monitored in real time, and the safety of the arrangement ship steering oar is improved. When potential problems and fault trends exist in the arrangement ship steering oar, a control instruction of the arrangement ship steering oar is adjusted so as to ensure safe operation of the arrangement ship steering oar, quick response can be made and an emergency mode can be started in emergency, dangerous situations such as out-of-control of the ship can be effectively avoided, remote monitoring and management can be achieved, and the safety of the arrangement ship steering oar is improved. Safety and management efficiency of the ship are improved, and safe driving of the ship is effectively guaranteed.

The invention is suitable for the technical field of vehicle intelligent control, and provides a model prediction controller parameter self-calibration method based on deep reinforcement learning. According to the method, modeling expression is carried out on the delay characteristic of a vehicle steering system by utilizing a first-order inertial link, the delay characteristic is used as a state variable to be augmented to an error tracking control architecture, and a model prediction controller considering the steering delay characteristic is designed according to the state variable; the problem that the transverse motion control performance of the automatic driving vehicle is deteriorated due to hysteresis between the target wheel rotation angle and the actual vehicle rotation angle is solved. Meanwhile, a deep Q network (DQN) of a multi-target reward mechanism is designed, and an optimal strategy is trained to quickly calibrate multiple parameters of model predictive control (MPC). The generalization performance of reinforcement learning enables the vehicle to adapt to most complex working conditions after sufficient training, the problems that in a traditional method, the parameter calibration time of a control system is long, and robustness is insufficient are solved, and high-precision and stable transverse control over the full-drive-by-wire four-wheel steering vehicle under the complex working conditions is achieved.

An electric vehicle and a powertrain for an electric vehicle are disclosed. According to an embodiment, an electric vehicle includes a steering system with a steering column, and a battery pack having a battery enclosure and a plurality of battery modules housed within the battery enclosure. The battery enclosure defines a slot that extends from at least a top surface of the battery enclosure to receive the steering column.

The invention discloses a road interference detection and compensation control method for a steering system, and belongs to the technical field of vehicle steering systems. The method specifically comprises the steps of road bumping detection and steering system road interference compensation control, the road bumping detection is that a detection signal is obtained through a time window integration method by utilizing the amplitude difference of the high-frequency interference torque of the steering system, and the road bumping is detected by adopting a dynamic threshold value in combination with various signals such as the steering torque and the vehicle speed; the method can adapt to different vehicle speed scenes and realize accurate identification. According to the road surface interference compensation control method, a steering system kinetic model containing interference torque is established, an expansion state observer is innovatively designed, the system state and the total disturbance quantity are actively estimated, state information which cannot be obtained by a traditional sensor is obtained, and the steering system dynamic model is obtained through a feed-forward control and compensation control method. Effective disturbance torque compensation control is achieved, and the robustness of a steering control system under the working condition of a bumpy road surface is enhanced.

The invention discloses a drive-by-wire chassis electric vehicle hardware-in-the-loop simulation test bench and a power chassis domain integrated control architecture thereof. The test bench comprises a driving simulation system, an electric drive system, a drive-by-wire brake system, a drive-by-wire steering system, an active suspension system, a power chassis domain integrated control system, a vehicle real-time simulation system and a bench measurement and control system. And the power chassis domain integrated control system receives a driver instruction, road environment and vehicle model information and response information of each execution system of the power chassis and the load simulation device of the execution system to complete decision-making instruction sending. The power chassis domain integrated control system adopts a hierarchical control architecture and comprises a vehicle motion stability judgment layer, a vehicle motion integrated control layer and an actuator and load control layer thereof. The system is used for testing and verifying control algorithms of various movement modes such as transverse and longitudinal movement modes, transverse and vertical movement modes and transverse, longitudinal and vertical movement modes of the drive-by-wire chassis intelligent electric vehicle, and has the characteristics of complete drive-by-wire chassis functions, high power chassis domain fusion degree, wide test coverage and the like.

The invention provides a vehicle control method, a vehicle and a computer readable storage medium, and relates to the technical field of vehicle control, and the method comprises the steps: carrying out the redundancy design of a steer-by-wire system of the vehicle, immediately triggering a fault processing mechanism under the condition that the steer-by-wire system is judged to have a fault, firstly positioning a fault condition, and carrying out the fault processing mechanism; then, the faults are graded based on the fault conditions to obtain fault grades, then the steering control strategy of the steer-by-wire system for the vehicle is adjusted according to the fault grades, and the speed of the vehicle is limited according to the fault grades; according to the steering-by-wire system, the steering control strategy corresponding to the fault level is executed, so that a user can still control the vehicle, the situation that the vehicle is out of control is avoided, the controllability, safety and reliability of the fault of the steering-by-wire system are improved, and the user experience is improved. And the driving experience and the driving confidence of the user and the credibility of the user for the steer-by-wire system are improved.

The embodiment of the invention provides a vehicle steering wheel and tire aligning method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the actual angle of a steering wheel and the actual angle of a tire under the conditions that a vehicle is detected to enter a parking state, a driver is not in a driving position, and a vehicle door is in a closed locking state; calculating an angle difference according to the actual angle of the steering wheel and the actual angle of the tire; controlling the steering wheel to return along with the tires according to the angle difference. According to the embodiment of the invention, the angle difference between the steering wheel and the tire is calculated, and then the steering wheel is controlled to return along with the tire through the angle difference, so that the problem that the tire of the steer-by-wire system cannot return automatically under the parking condition is solved, unnecessary damage to a vehicle is avoided, damage to chassis components, a steering machine, the tire and the like is avoided, and the safety of the vehicle is improved. Meanwhile, the problem that the steering wheel and the tires are not aligned is solved, and it is guaranteed that the steering wheel and the tires are located in the middle straight-moving position when a driver restarts the vehicle.

The embodiment of the invention discloses an automobile power-assisted steering test system and method, and relates to the technical field of automobile electronics. An EPS controller in the automobile power-assisted steering test system is used for acquiring an input torque generated by a driver simulation motor through an angle torque sensor; according to the input torque and the state information of the vehicle, the power-assisted torque needing to be output by the EPS motor in the steering process is determined; the power-assisted torque is sent to an EPS motor, so that the EPS motor assists the vehicle in steering; if the input torque, the power-assisted torque and the actual resistance torque of the rocker arm end are balanced in the steering process of the vehicle, and the amplitude and the variation trend of the power-assisted torque all accord with the preset power-assisted characteristic curve, the vehicle power-assisted steering test passes. Therefore, by introducing a driver steering wheel input part and a steering resistance simulation part, the automobile power-assisted steering test system can simulate the working principle of a steering system more truly, so that the test precision and effect are improved.

The invention provides a trajectory tracking method, device and equipment based on steer-by-wire fault tolerance and a medium wherein the trajectory tracking method based on steer-by-wire fault tolerance comprises: when a steering execution motor has a fault, determining expected control parameters for vehicle trajectory tracking, the expected control parameters comprising an expected steering wheel steering angle and an expected differential yaw moment; reducing the expected steering angle of the steering wheel and increasing the expected differential yawing moment; determining a front axle differential steering torque and an output torque of a steering execution motor based on the expected steering wheel steering angle; and trajectory tracking is carried out based on the front axle differential steering torque, the expected differential yawing torque and the output torque of the steering execution motor. When the steering-by-wire system breaks down, the front axle differential steering torque can be used for assisting the fault steering-by-wire system in stably tracking the expected steering wheel steering angle, and then the requirement of vehicle trajectory tracking for steering is met. Meanwhile, the stability of vehicle trajectory tracking can be improved.

The invention discloses a hardware-in-the-loop test system of a steering system, which comprises an upper computer, a steering execution simulation system, a wire harness connection fault test box and a motor controller, and is characterized in that the upper computer is used for simulating the driving state of a vehicle and generating vehicle operation condition information; the steering execution simulation system is used for simulating a sensor to generate a corresponding sensor signal according to the vehicle operation condition information and sending the sensor signal to the motor controller; the motor controller is used for generating a motor control signal required when the vehicle executes steering operation according to the received sensor signal; the steering execution simulation system is also used for simulating the work of the motor according to the motor control signal and feeding back the working state information of the motor to the motor controller, so that the upper computer can judge whether the logic function of the steering system is normal or not according to the working state information of the motor; the wire harness connection fault test box is used for simulating open circuit and short circuit of signals between the steering execution simulation system and the motor controller so as to realize fault injection test.

The invention relates to the technical field of vehicle stability control and fault-tolerant control, and discloses a steer-by-wire vehicle stability control method under actuator faults and input hysteresis, a terminal and a medium. The method comprises the following steps: establishing a kinetic model of a steer-by-wire vehicle, and constructing a front wheel subsystem kinetic model in a steer-by-wire system by comprehensively considering an actuator fault, input hysteresis and a state constraint condition; according to the steering angle instruction of the driver and the ideal vehicle model, the expected yaw velocity and the expected sideslip angle of the vehicle are obtained through calculation; designing an upper-layer stability controller of the front wheel subsystem; generating a desired front wheel steering angle for the front wheel subsystem; and a lower-layer steering angle tracking controller of the front wheel steering system is designed, the front wheel steering angle tracking performance of the steer-by-wire system under the working conditions of actuator faults and input hysteresis is ensured, and the actual front wheel steering angle of the vehicle approaches the expected front wheel steering angle. According to the invention, the steer-by-wire system can still maintain the stability of the vehicle under the conditions of actuator fault and input hysteresis.

Technical solutions described herein include a method of controlling an electric power steering system includes determining that one or more hand wheel torque sensors of electric power steering system are not operational and in response generating an assist torque command by estimating a front slip angle based on a motor angle of a motor of the electric power steering system and a vehicle speed. The method also includes converting the front slip angle to a rack force. The method also includes determining an amount of assist torque based on the rack force and controlling the electric power steering system using the generated assist torque command.

A method for automated guidance of a vehicle along a specified setpoint trajectory at an actual speed, wherein the setpoint trajectory includes geometric trajectory variables, the method including ascertaining an actual deviation of the vehicle from the setpoint trajectory and outputting the ascertained actual deviation and generating manipulated variables such that the vehicle, in the case of automated control of a drive system and / or a braking system and / or a steering system of the vehicle, moves closer to the setpoint trajectory. The method also includes ascertaining whether an undesirable driving state is present when the vehicle moves closer to the setpoint trajectory, wherein the undesirable driving state is ascertained from the specified setpoint trajectory based on the geometric trajectory variable, and, if the presence of the undesirable driving state is identified, automatically controlling the vehicle based on generated stability variables and / or adapting the setpoint trajectory.

Provided are a method and system for auxiliary emergency braking after a braking failure, and an electronic device, a computer-readable storage medium, a computer program product and a computer program. The method comprises: obtaining a braking system failure factor parameter numerical value on the basis of a braking system health state observer or a fault diagnosis module of a current vehicle; constructing a braking risk decision function on the basis of a braking system failure factor and related data of the current vehicle to calculate a current braking risk value, and obtaining a desired lateral displacement of the current vehicle on the basis of the current braking risk value and steering system data; constructing an integral heuristic barrier Lyapunov function on the basis of the desired lateral displacement of the vehicle and vehicle state information after decision making, and obtaining a desired vehicle traveling yaw angle on the basis of a calculation result of the function; and converting the desired vehicle traveling yaw angle into an input front wheel steering angle value of the current vehicle, and converting the input front wheel steering angle value of the current vehicle into steering-assist electric motor output data, so that a steering system intervenes in and controls safe braking after a braking process fails.

A method for operating a steering system of a vehicle, wherein the steering system comprises a steering mechanism and at least one electric motor cooperating with the steering mechanism, and wherein a stiffness of a steering assembly of the steering mechanism and / or play in the steering mechanism is determined includes determining the stiffness of the steering assembly and / or play in the steering mechanism. The steering mechanism is brought into a defined test position and / or blocked in the test position and the electric motor is actuated with an excitation signal, and the stiffness of the steering assembly and / or play in the steering mechanism is determined in that, during the actuation of the electric motor with the excitation signal, a motor torque of the electric motor and a rotor orientation angle of the electric motor is monitored and a change in the motor torque is evaluated according to the rotor orientation angle.

“THREE-DIMENSIONAL MONITORING SYSTEM FOR KINGPIN ON FIFTH WHEEL” describes an invention patent, for a monitoring system of Kingpin / Fifth Wheel articulation presented on trucks, with a great applicability for autonomous steering systems and vehicle dynamics control. This system allows the precise monitoring of translational, rotational movements and the relative accelerations of the king pin (5) in relation to the fifth wheel (3) on the X, Y and Z axes, totaling measurements in six degrees of freedom. The present patent presents two ways to make this monitoring of the three-dimensional position of the kingpin (5): The first through a set of sensors (6) accelerometers and gyroscope integrated to an electromagnet (4) that when electrified, is coupled to the king pin (5) by magnetic attraction. The second mode through a reference device (20) that is magnetic, identifiable, independent and easy to apply to the kingpin (4).