4739results about "Automatic steering control" patented technology

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.

An inductive sensor system may comprise an upper rotor comprising an upper target having a first metallic pattern; a lower rotor comprising a lower target having a second metallic pattern; and a stationary circuit board positioned between the upper rotor and the lower rotor. The circuit board comprises one or more transmitter coil sets configured to generate electromagnetic field, and one or more receiver coil sets for sensing relative angular displacement movement between the upper rotor and the lower rotor. The one or more transmitter coil sets and the one or more receiver coil sets are circularly wound.

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.

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.

The invention provides a distributed electric drive vehicle four-wheel differential torque enhanced steering control method and system, and belongs to the technical field of artificial intelligence risk prediction. The vehicle is provided with an upper-layer torque decision module, a lower-layer torque cooperation module and a vehicle-mounted sensor; selecting a pivot steering auxiliary strategy according to an actual driving scene, and pressing a function key to enter a working condition; vehicle dynamic information is obtained through a vehicle-mounted sensor, whether a vehicle is in an in-situ steering state or a small-radius steering state is judged by combining vehicle body static data, and when a selected function key is in an in-situ steering state or a small-radius steering state, the vehicle dynamic information is obtained in real time, and fuzzy reasoning and a neural network algorithm are combined. The ground attachment coefficient and the target yaw angle speed are intelligently judged, and therefore accurate control over the steering torque is achieved; or a double-controller structure is adopted, the torque of each wheel can be effectively distributed and adjusted under complex working conditions, and flexible control and stable running of the vehicle in a narrow space are ensured.

The invention relates to the technical field of automobile electric control, in particular to a new energy automobile electric control steering control method and system, and the method comprises the steps: obtaining and preprocessing a four-wheel vibration data sequence, carrying out the segmentation and consistency evaluation of the vibration data sequence of each wheel, and selecting a current data sequence in an optimal segment to calculate a road condition influence coefficient. And matching the current data sequence with the historical vibration data sequence, calculating the similarity to determine the influence weight, adjusting the influence coefficient in combination with the steering angle change rate of the historical vibration data sequence, inputting the adjusted pavement condition influence coefficient into the ECU, dynamically adjusting the steering auxiliary torque, and realizing accurate steering control. According to the method, the optimal segment is selected through segment processing and consistency evaluation to accurately reflect the current road condition, the steering auxiliary torque is dynamically adjusted in combination with historical vibration data sequence matching and the steering angle change rate, and the driving safety and comfort 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 an electric power steering fault diagnosis and self-adaption system based on torque offset, which relates to the technical field of fault diagnosis and comprises a data acquisition unit, a model establishment unit, a torque offset evaluation unit, a fault judgment unit and a power output adjustment unit. According to the method, the return-to-power torque model is constructed based on the vehicle dynamics law and experience adjustment, the model parameters are optimized to obtain the return-to-power torque model, meanwhile, the real-time output torque of the EPS system is calculated according to the steering wheel torque signal, the deviation coefficient of the EPS system is comprehensively calculated, and the accuracy of the EPS system is improved. The deviation coefficient is evaluated according to a preset fault grading interval, a multi-grade fault judgment mechanism is established according to the change rule of the deviation coefficient, dynamic health evaluation of the EPS system motor performance is achieved, the evaluation serves as the basis of control strategy adjustment, the output assistance value can be dynamically adjusted, return control can be enhanced or a safety mode can be switched, and the reliability of the EPS system motor performance is improved. Therefore, the redundancy control capability and the driving safety are improved.

The invention is applicable to the technical field of automobile steering control, and provides a steering return control method for objective steering evaluation, which comprises the following steps of: acquiring vehicle state parameters; judging the membership degrees of the driver to the conservative driving style, the normal driving style and the sports driving style, and calculating the values of the coefficient influencing the return speed and the coefficient influencing the lateral acceleration; generating a reference return speed; a reference return speed # imgabs0 # is used as a tracking target, and a smooth return torque is generated through MPC. According to the method, design is conducted with the objective evaluation phenomenon as the guide, a large number of real vehicle site tests do not need to be conducted in the later development stage to calibrate relevant parameters, the method faces objective evaluation and personalized driving experience, a driver decides the emphasis of objective evaluation, and therefore personalized objective evaluation-oriented automobile steering return control is achieved.

A work vehicle includes wheels for steering, a steering device to change a steering angle of the wheels for steering, a sensor to output data indicating features around the work vehicle, and a controller to control self-traveling of the work vehicle, set a maximum steering angle for the wheels for steering based on a state of the work vehicle or its surrounding environment, detect two crop rows on opposite sides of the work vehicle based on the data, set a target path for the work vehicle in between the two crop rows, compute a target steering angle for the wheels for steering, limit the target steering angle to be equal to or smaller than a maximum steering angle when the computed target steering angle is greater than the maximum steering angle, and control the steering device so that the steering angle of the wheels for steering equals the target steering angle.

A system including a computer having a processor and a memory. The memory includes instructions executable by the processor to, upon actuating movement of a steering element of a vehicle, measure a torque applied to the steering element in a direction opposite the actuated movement. In response to a determination that the torque is less than a predetermined threshold, the processor actuates a component of the vehicle.

A system for collaborative steering in steer-by-wire (SBW) vehicles includes sensors, a rack motor altering a position of the vehicle's steerable road wheels and an emulator altering a torque and position of a vehicle hand wheel. A collaborative steering system application (CSSA) obtains, static and dynamic information about the vehicle and the vehicle's environment, and generates a rack torque and / or angle command to the rack motor and an emulator torque and / or angle command to the emulator. The CSSA adjusts between ADAS and manual steering ratios and automatically transitions control between ADAS SBW control and manual control. The CSSA smooths transitions between ADAS SBW control and manual steering control and adjusts hand wheel stiffness by altering the emulator torque command, and causes the rack motor and emulator to operate according to a kinematic model while adapting road wheel response and vehicle operator steering feel based on scenarios and features currently enabled.

A conflict control method for shared driving, and an electronic device are provided. The method includes: establishing, based on a deterministic steering torque of a driver and a stochastic steering torque of the driver, a game model for human-machine path tracking control corresponding to a human-machine interaction behavior; obtaining human-machine torque conflict information by solving the game model for human-machine path tracking control; determining a shared control strategy according to the human-machine torque conflict information; and controlling a shared driving vehicle according to the shared control strategy.

The invention discloses a shimmy suppression method for a four-wheel independent steer-by-wire system. The shimmy suppression method comprises the following steps: establishing a wheel shimmy kinetic model of the four-wheel independent steer-by-wire system; designing a barrier Lyapunov function, and converting the swing amplitude constraint into a state constraint condition; designing a backstepping sliding mode controller parameter self-tuning strategy based on the shimmy frequency; designing a back-stepping sliding mode controller with self-adaptive swing amplitude-frequency characteristics based on the state constraint condition; based on a designed backstepping sliding mode controller, active self-adaptive control is carried out on shimmy phenomena of wheels with different frequencies and amplitudes, and then suppression of the shimmy phenomenon of the four-wheel independent steer-by-wire system is completed. According to the amplitude-frequency characteristics of the shimmy phenomenon occurring in the operation process of the four-wheel independent steer-by-wire system, the shimmy phenomenon of different frequencies and amplitudes can be restrained in a self-adaptive mode, then the reliable operation capacity of the four-wheel independent steer-by-wire system is improved, and vehicle instability caused by excessive shimmy of wheels is avoided.

A method of controlling motor torque in a vehicle comprises receiving torque requests; determining first upper and lower torque thresholds based on vehicle sensor information; determining second upper and lower torque thresholds; if consecutive torque requests are received that are between the first and the second upper torque threshold or between the first and the second lower torque threshold, summing up over time the consecutive torque requests between the first the second upper torque thresholds or between the first and the second lower torque thresholds to find a summed-up torque value; and if the summed-up torque value exceeds a summed-up torque limit, adjusting the second upper torque threshold and / or the second lower torque threshold. The first upper and torque thresholds are indicative of a range of allowable torque, and the second upper and lower torque thresholds set upper and lower limits which the motor torque cannot exceed.

A steer by wire includes a steering wheel holding system. An emulator controller receives vehicle data from vehicle systems and determines whether a vehicle is in one of a driving mode and a non-driving mode. When the vehicle is in the driving mode, the emulator controller transmits a command to an emulator switching system to electrically couple the phases of an emulator motor to a power source to enable the emulator motor to implement steer by wire operations placing the steering wheel in an un-hold mode. When the vehicle is in the non-driving mode, the emulator controller transmits a command to the emulator switching system to electrically couple the phases of the emulator motor to ground to short the phases of the emulator motor to ground to generate a resistive torque to resist rotational movement of a steering wheel of the vehicle placing the steering wheel in a hold mode.

The utility model discloses a worm type steer-by-wire device which comprises a moment road sense feedback device, a steering column comprises a spline shaft, and one end of the spline shaft is connected with a steering wheel. The torque feedback assembly comprises a first gear shaft, an angle torque sensor, a motor, a worm and a worm gear. The first gear shaft is connected with the spline shaft. The angle torque sensor is installed on one side of the first gear shaft. The worm gear is mounted on the first gear shaft; a worm matched with the worm gear is arranged at the output end of the motor. Detecting the torque and angle of the steering wheel through an angle torque sensor; according to the detected torque and angle, a feedback torque is simulated through a motor, a worm and a worm gear, and linear steering control can be realized through simulating and adjusting steering damping through the motor; mechanical decoupling between the steering wheel and the steering actuator is achieved, the steering hand feeling is improved, and personalized driving requirements can be met.

An apparatus for steering adjustment detects a gaze direction of a driver of a vehicle from a facial image in which a face of the driver is represented. During autonomous driving in which steering of the vehicle is autonomously controlled, when an operation by the driver on a steering wheel is detected, determines whether the gaze direction of the driver corresponds to the steering direction in the operation of the driver. The apparatus adjusts a reaction force with respect to the operation of the steering wheel smaller when the gaze direction corresponds to the steering direction than when the gaze direction does not correspond to the steering direction.

To provide a method for operating a steering device of a motor vehicle according to the steer-by-wire principle.SOLUTION: A steering device (1) comprises a rotatable steering handle (2), in particular steering wheel, to provide a steering request. The steering device (1) comprises an electric machine (3) mechanically coupled to the steering handle (2). The electric machine (3) is drive-controlled in an active state of the steering device (1) to generate a reset torque counteracting a rotational movement of the steering handle (2), and the machine (3) is drive-control free in an idle state of the steering device (1). In the idle state, an electrical voltage of the electric machine (3) is detected to determine a rotational movement of the steering handle (2), and if the electrical voltage reaches a predetermined threshold value, in particular exceeds it, the active state is activated.SELECTED DRAWING: Figure 1

A travel assistance method sets a target slip angle, estimates or detects an actual slip angle, sets a target braking / driving force by, when a sign of the vehicle body slip angle rotating in a turning direction of the vehicle is defined as positive and a sign of the vehicle body slip angle rotating in an opposite direction to the turning direction is defined as negative, correcting a required braking / driving force in such a manner as to increase a braking / driving force for a rear wheel or reduce a braking / driving force generated on a front wheel when the actual slip angle is larger than the target slip angle and correcting the required braking / driving force in such a manner as to reduce a braking / driving force for the rear wheel or increase a braking / driving force generated on the front wheel when the actual slip angle is smaller than the target slip angle.

A steering system includes: an operation device including an operation member and a reaction force application device; a turning device mechanically cut off from the operation device and configured to turn a wheel according to a control current; and a controller configured to control the turning device and the reaction force application device based on an operation signal relating to an action of the operation member. The steering system is configured to switch between a normal mode of turning the wheel based on the operation signal and a virtual mode of steering a virtual mobile body based on the operation signal. In the virtual mode, the controller sets the control current to a current value at which the wheel does not turn regardless of the operation signal, and sets the operation reaction force based on a predetermined oscillation component of a signal received from the turning device.

A method for controlling steering wheel torque in a steering system of a vehicle includes obtaining at least one of a reference yaw rate of the vehicle and a reference yaw acceleration of the vehicle; obtaining at least one of a yaw rate error and a yaw acceleration error based on at least one of the reference yaw rate and the reference yaw acceleration; obtaining a steering wheel torque correction based on at least one of the yaw rate error and the yaw acceleration error; adjusting a reference torque using the steering wheel torque correction amount; and controlling the steering wheel torque using a reference torque adjusted using the steering wheel torque correction amount.

Disclosed in the present application is a torque vectoring control system for an in-wheel-motor four-wheel-drive vehicle. In the torque vectoring control system, a driving style identification module determines the driving style of a driver during the travel of an in-wheel-motor four-wheel-drive vehicle; a vehicle state sensing module acquires a steering wheel angle and a longitudinal vehicle speed in real time, and performs fault state monitoring on the in-wheel-motor four-wheel-drive vehicle; a vehicle motion control module calculates an ideal yaw rate target of the in-wheel-motor four-wheel-drive vehicle; and a torque vectoring control module calculates an additional yaw moment on the basis of the ideal yaw rate target and an actual yaw rate, executes a corresponding fault handling strategy on the basis of a fault state monitoring result, and then performs torque distribution on the basis of the additional yaw moment combined with the fault state monitoring result to generate an additional driving torque and an additional braking torque of each wheel. The present application realizes self-adaptive yaw stability control for drivers having different driving styles.

In one aspect of a vehicle control device and a vehicle control method according to the present invention, in steering reaction force control, in which steering reaction force torque to be applied to a steering operation input mechanism operated by a driver is derived on the basis of the motion state of a vehicle and a reference steering reaction force characteristic indicating a characteristic of steering reaction force torque with respect to the motion state of the vehicle, the reference steering reaction force characteristic is changed in accordance with a characteristic obtained by trial driving using a prescribed trial steering reaction force characteristic. This makes it possible for the characteristics of the steering reaction torque applied to the steering operation input mechanism to be changed to characteristics that are suited to the aptitude of the driver.

A method for controlling handwheel torque in a steering system of a vehicle includes obtaining at least one of a reference yaw rate of the vehicle and a reference yaw acceleration of the vehicle, obtaining at least one of a yaw rate error and a yaw acceleration error based on the at least one of the reference yaw rate and the reference yaw acceleration, obtaining a handwheel torque modifier based on the at least one of the yaw rate error and the yaw acceleration error, adjusting a reference torque using the handwheel torque modifier, and controlling the handwheel torque using the reference torque as adjusted using the handwheel torque modifier.

The embodiment of the invention provides a vehicle steering control method, a controller, a vehicle, a medium and a program product, and the method comprises the steps: obtaining a steering wheel rotation angle and a vehicle longitudinal speed of the vehicle when the vehicle is controlled to steer; according to the steering wheel angle and the vehicle longitudinal speed, target steering control parameters are determined, and control is conducted according to the target steering control parameters; actual steering control parameters of the vehicle are obtained; according to the target steering control parameter and the actual steering control parameter, fast terminal sliding mode control is carried out, and yawing moment and a rear wheel steering angle are generated; according to the yawing moment and the steering angle of the rear wheels, the two first wheels are controlled, and the control stability of the vehicle can be improved through the embodiment of the invention.

A vehicle driving support device issues an alert to notify a driver of a vehicle in advance that the vehicle is approaching a road having a large curvature. The vehicle driving support device includes a forward information providing device that provides forward information that is information forward of the vehicle, acquires, from the forward information, a curvature of a point that is a first distance forward from the vehicle and a curvature of a point that is a second distance forward from the vehicle, as a near point curvature and a distant point curvature, respectively, the second distance being longer than the first distance, and the curvatures being curvatures of a road on which the vehicle is traveling, and issues the alert when an alert condition is satisfied that the distant point curvature is larger than the near point curvature by a predetermined value or more.

The present application provides a control method, device, vehicle and storage medium for vehicle steering. When the automatic U-turn mode is turned on, the vehicle controller obtains the auxiliary parameters of the vehicle according to the pre-activation signal input by the user, and generates the target direction, rotation angle, feedforward torque, target wheel speed, and then sends a steering instruction to the motor controller. The motor controller responds according to the feedforward torque, obtains a response signal, and sends it to the vehicle controller. Based on the response signal, the vehicle controller obtains the swing angle sensor information and the lateral longitudinal acceleration information to calculate the wheel rotation angle and sends it to the motor controller. The motor controller performs self-closed loop control based on the target direction, target wheel speed, wheel rotation angle, rotation angle and auxiliary parameters to control the vehicle to complete the steering. Automatic U-turn and zero turning radius steering of the vehicle are realized, making the vehicle steering more flexible, accurate and efficient, and reducing the rotation error, achieving millisecond-level drive control.

A vehicle steering assist device includes a steering assist ECU. The steering assist ECU calculates a target steering angle for driving the vehicle along the road, and a target steering guide torque that guides the driver's steering so that the actual steering angle becomes the target steering angle. The steering assist ECU controls the torque applying device so that the steering guide torque becomes the target steering guide torque. The steering assist ECU acquires at least one of information on the driving environment of the vehicle and information on the state of the driver, and calculates an index value indicating the necessity of the steering guide torque based on at least one of the pieces of information. The steering assist ECU corrects the target steering guide torque based on the index value so that the higher the need for the steering guide torque, the larger the target steering guide torque.

According to the torque control method and system, the control method comprises the steps that the difference value between a first target angle and a current rotation angle is determined, when the first target angle is automatic steering, an electric power steering system executes the target angle according to a rotation angle request of advanced auxiliary driving, and when the current rotation angle is first torque applied to a steering wheel, the current rotation angle is the target angle executed according to the rotation angle request of advanced auxiliary driving; real included angles between wheels and the front of the vehicle; calculating a second torque of the motor according to the difference value, the vehicle speed and the first torque; wherein the second torque is the output torque of the motor, is in negative correlation with the difference value and the first torque and is in positive correlation with the vehicle speed. According to the control method, the output torque of the motor can be calculated according to the first target angle, the current rotating angle, the vehicle speed and the first torque, when the driver intervenes in taking over in advanced auxiliary driving, the resistance of the steering motor and the driver during automatic driving and the jamming feeling during intervention can be greatly reduced, the hand feeling transition of the driver is smoother, and the driver experience is improved. And meanwhile, the steering angle control precision of automatic steering can be ensured.