902 results about "Electric power steering" 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.

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.

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 discloses a recirculating ball type electric power steering system fault self-checking method and system and a readable medium, and relates to the technical field of vehicles, and the method comprises the steps: storing a signal transmission path and each function node, determining the type of an influence factor which influences the instruction execution accuracy of the function node, and determining the instruction execution accuracy of the function node; analyzing and acquiring the relationship between the fluctuation amplitude of the data signal at each function node and the numerical value of the influence factor, storing the relationship as a correction model, and storing a first relationship model for reflecting the data association relationship among the function nodes on the same signal transmission path; acquiring real-time data and source data of various impact factors, and generating theoretical response data according to the first relation model, the real-time impact factor data and the correction model; the actual response data is collected, the deviation amplitude between the actual response data and the theoretical response data is calculated, whether the function node breaks down or has a potential fault is judged according to the deviation amplitude, early warning is output, and the fault detection accuracy and the potential fault pre-judgment capability are greatly improved through the technical scheme.

An electric powered steering assembly includes a housing with a cylindrical portion extending in an axial direction, an interior wall of the cylindrical portion defines a groove and extends in the axial direction, and the groove has at least two inwardly tapered walls. A ball screw is disposed in the housing and defines a hole extending in a radial direction. A ball nut disposed in the housing, surrounding the ball screw, is configured to rotate relative to the housing. An anti-rotational pin has a tapered end disposed in the hole, the tapered end having tapered surfaces corresponding to the at least two inwardly tapered walls. A spring is disposed in the hole and biases the anti-rotational pin in a radially outward direction towards the groove so that the tapered end of the anti-rotational pin engages the groove and thereby restricts rotation of the ball screw relative to the housing.

The invention belongs to a man-machine cooperative control technology in the field of intelligent driving, and particularly discloses a lane departure early warning and correction method based on driver behavior prediction. And in combination with vehicle state parameters (such as vehicle speed, yaw velocity, lane departure distance and the like), a Transformer-CNN hybrid model is adopted to predict the steering intention of the driver, so that accurate behavior judgment is realized. Multi-source data are fused through a graph neural network (GNN), the lane departure risk is dynamically evaluated, integration with an electric power steering system (EPS) is achieved, damping and torque of a steering wheel are adjusted in real time, and a vehicle is actively corrected to a safe lane. Meanwhile, the system provides multi-mode early warning such as sound, vibration and head-up display (HUD) according to the risk level, and it is ensured that a driver responds in time.

The invention discloses a vehicle control method, control equipment, a vehicle and a computer readable storage medium, and the vehicle control method comprises the steps: obtaining biological characteristic information, driving environment data and driving behavior data of a driver; based on the biological characteristic information, the driving environment data and the driving behavior data, the steering torque is dynamically calculated through a weighting algorithm; and the steering torque is sent to an electric power steering system controller so as to adjust the steering output torque of the vehicle. In this way, according to the technical scheme, accurate adjustment of the steering output torque of the vehicle can be achieved, so that the driving safety and individuation are improved.

The objective of the present disclosure is to realize downsizing of the bus-bar holder, and then to downsize an electric rotating machine apparatus and an electric power steering apparatus. In a first protruding portion of the bus-bar holder, there are provided a columnar portion, two or more first ribs that are provided on an outer circumferential surface of the columnar portion in such a way as to be parallel with a center axis of the columnar portion and in such a way as to be spaced apart from one another, and two or more second ribs; the first rib makes contact with an inner circumference surface of a first through hole of the control circuit board; the second rib makes contact with an inner circumference surface of a second through hole of the bus bar.

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.

The invention provides an electric power steering active return control method and system, and belongs to the field of electric power steering systems.The electric power steering active return control method comprises the steps that in the rotating process of a vehicle steering wheel, zone control is conducted with the steering wheel rotating angle as the benchmark, and original request torque is obtained; estimating the inertia moment of the steering wheel in the steering wheel aligning process; and calculating the original request torque and the steering wheel inertia torque to obtain a corrected steering wheel torque, and correcting the steering wheel torque according to the corrected steering wheel torque. According to the technical scheme, the aligning torque error caused by rotating speed fluctuation of the steering wheel is eliminated, and particularly under the working condition that a driver is completely released from the hand, the stability of aligning control is remarkably improved.

A steering assembly includes a housing. An interior wall of a cylindrical portion of the housing defines a groove that extends in an axial direction and having inwardly tapered walls. A ball screw disposed in the housing defines a hole in a radial direction. An anti-rotational pin having a tapered end is disposed in the hole, the tapered end corresponding to the inwardly tapered walls. A spring disposed in the hole biases the anti-rotational pin so that the tapered end of the anti-rotational pin engages the groove and restricts rotation of the ball screw. A support bushing disposed between the ball screw and the housing is fixedly coupled to the ball screw and defines a through hole between the groove and the hole of the ball screw, the through hole receives the anti-rotational pin. The support bushing absorbs radial loads exerted on the ball screw and supports the anti-rotational pin.

The invention relates to the technical field of steering systems, in particular to an electric power steering system. The electric power steering system comprises a steering axle, two steering motors, a steering wheel and a proportional potentiometer. The output power of the steering motor can be intelligently adjusted according to key parameters such as the rotating speed and angle of the steering wheel and the vehicle running speed, it is ensured that under different driving conditions, proper steering assistance is provided, steering sensitivity and accuracy are ensured, unnecessary energy consumption is avoided, and the driving safety is improved. In addition, external cooling air can be sucked, uniform and rapid flowing of cooling lubricating liquid can be ensured, rapid cooling of the steering motor is achieved through combination of the external cooling air and the cooling lubricating liquid, the working temperature of the steering motor is rapidly reduced, the overheating phenomenon is prevented, and the service life of the steering motor is prolonged. And the stable working state of the steering motor under various working conditions is ensured.

An electric powered steering assembly for a commercial vehicle includes a housing. An interior wall of a cylindrical portion of the housing defines a groove that extends in an axial direction, the groove having inwardly tapered walls. A ball screw is disposed in the housing and defines a hole extending in a radial direction. A ball nut disposed in the housing, surrounding the ball screw, rotates relative to the housing. An anti-rotational pin having a tapered end is disposed in the hole, the tapered end having tapered surfaces corresponding to the inwardly tapered walls. A bearing material is disposed on tapered surfaces of the tapered end. A spring is disposed in the hole and biases the anti-rotational pin in a radially outward direction towards the groove so that the tapered end of the anti-rotational pin engages the groove and restricts rotation of the ball screw relative to the housing.

To provide a controller for rotary electric machine and an electric power steering apparatus which can set a control gain which is used for controlling the d-axis current command value based on the q-axis current deviation between the current command value of q-axis and the current detection value of q-axis, considering the response of the current of q-axis. A controller for rotary electric machine changes the current command value of d-axis, based on a value obtained by multiplying a proportional gain to a q-axis current deviation which is a deviation between the current command value of q-axis and the current detection value of q-axis; and changes the proportional gain in inverse proportion to the rotational angle speed.

The invention provides a steering gear autonomous zero calibration control system and a steering gear autonomous zero calibration control method. The steering gear autonomous zero calibration control system comprises a data acquisition module used for acquiring required bus message information; the vehicle mass calculation module is used for calculating the vehicle mass; the steering wheel angle calculation module is used for calculating a corresponding steering wheel sensor angle value; the tire pressure calculation module is used for receiving the tire pressure measured by the tire pressure sensor; the straight-line driving judgment module is used for judging whether the vehicle is in a straight-line driving state or not according to the wheel rotation angle obtained by the wheel rotation angle sensor in the steering controller; the zero angle control module is used for vehicle zero angle control calibration; and the data storage module is used for storing the data in the corresponding NVRAM after the vehicle learns new zero angle data. The problem that a steering wheel is not correct due to the fact that the electric power steering zero angle of the vehicle deviates from the zero position due to changes of the mass and the tire pressure of the vehicle is solved.

The invention relates to the technical field of mechanical parts, and discloses a high-bearing engineering plastic worm gear applied to a light truck electric power steering system and a manufacturing process, and the manufacturing process comprises the following steps: pretreatment of a polymer base material, preparation of a composite reinforcing material, preparation of an injection molding raw material, precise injection molding, post-treatment and detection. After a polymer base material is subjected to fluorination activation treatment, the surface energy of the material is reduced, the interfacial compatibility with a composite reinforced material is enhanced, and through the synergistic effect of chemical bonding and physical anchoring formed between matrix resin and a modified reinforcement body, the interfacial layering tendency of engineering plastic and a fiber reinforced phase is overcome, so that stress transmission is more uniform; meanwhile, the functional additive components generate an in-situ synergistic effect in the precise injection molding process, and form a multi-stage enhanced network with matrix resin, so that the worm wheel matrix is endowed with excellent overall bearing strength and fatigue fracture resistance, and the structural integrity under the working conditions of high load and high-frequency steering is ensured.

The invention discloses a method for testing an electric power steering system assembly, and belongs to the technical field of automobile part testing. The technical problems that in an existing testing method, static and dynamic testing processes are separated, testing efficiency is low, and quantitative evaluation on key dynamic performance parameters is difficult are solved. According to the invention, a test tool comprising a simulation rack, a driving device, an encoder, a torque sensor and a data acquisition card is adopted, and a control and processing module automatically executes a continuous test process: firstly, performing a static assistance test on an assembly, and judging qualification; and if the test is qualified, the test is automatically switched to dynamic test, a torque command signal is sent to the assembly, an output shaft is driven to rotate forwards and backwards, a position and a feedback torque signal are collected, and dynamic response parameters such as a position dispersion error, power-assisted delay time and overshoot are calculated. The method is mainly used for comprehensive performance testing and quality evaluation of the electric power steering system assembly in the production manufacturing or maintenance after-sales link.

The invention discloses a speed-dependent power-assisted control method and device of an electric power steering system and a medium. The method comprises the following steps: acquiring vehicle frequency sweep experiment data; processing the frequency sweep experiment data; frequency response characteristics from steering wheel torque to a motor torque instruction and from motor electromagnetic torque to the motor torque instruction are obtained; establishing a stability controller optimization model, and calculating stability controller parameters at zero vehicle speed; the damping ratio is adjusted, and stability controller parameters under other typical vehicle speeds are calculated; determining a speed-dependent assistance mapping relation; calculating an amplitude margin and a phase margin of the electric power steering system in a main vehicle speed range based on the speed-following power-assisted mapping relation and parameters of a stability controller; and when the amplitude margin and the phase margin meet the minimum threshold requirement, finishing controller design. According to the stability controller, the stability of the electric power steering system can be guaranteed, and meanwhile the expected steering hand feeling defined by the speed-following power-assisted mapping relation can be kept as much as possible.

The utility model relates to the technical field of automobile steering, and discloses a multi-stage gear type all-electric power steering device which comprises a control module and a power steering module. The control module comprises at least two steering control units which are connected with each other through SPI (Serial Peripheral Interface) signals; the power-assisted steering module comprises a power-assisted motor, a gear transmission mechanism, a planetary gear mechanism, a worm and gear mechanism, a shell, an input shaft and an output shaft, the power-assisted motor is arranged on the shell, the gear transmission mechanism, the planetary gear mechanism and the worm and gear mechanism are arranged in the shell, and the power-assisted motor is in transmission connection with the gear transmission mechanism; the planetary gear mechanism is connected with the gear transmission mechanism, and the worm and gear mechanism is connected with the planetary gear mechanism. The multi-stage gear type all-electric power steering device solves the limitation of an existing electric power steering device in the application field of commercial vehicles, and the pure electric steering device which is efficient, energy-saving, light and convenient in steering and good in controllability can be provided for passenger and goods commercial vehicles.

The utility model discloses a worm gear and worm clearance compensation mechanism of an electric power steering system, which comprises a shell, a worm and a worm gear are arranged in the shell, the worm is meshed with the worm gear, a ring sleeve is arranged in one axial end of a worm mounting cavity, a cavity is arranged in the ring sleeve, and the worm gear and the worm gear are meshed with each other. One end of the worm extends into the cavity and is matched with the ring sleeve through a bearing arranged on the outer side of the worm in a sleeving mode, an installation hole is formed in the position, corresponding to the bearing, of the side wall of the ring sleeve in the radial direction, a hole cavity is formed in the position, corresponding to the installation hole, of the shell, an adjusting bolt arranged in the axial direction of the installation hole is installed in the hole cavity, and an ejector block is installed at the end of the adjusting bolt. The first end of the ejecting block penetrates through the hole cavity and the mounting hole to abut against the bearing, the block-shaped elastic body is arranged between the second end of the ejecting block and the adjusting bolt, the ejecting block is supported and ejected outwards by arranging the block-shaped elastic body supporting stably, and therefore the ejecting block cannot rebound to impact the adjusting bolt when subjected to large impact, and the service life of the ejecting block is prolonged. The problem that noise is generated under the extreme working condition is solved.

The invention discloses a low-temperature friction compensation method and system for an electric power steering system, and the method comprises the steps: obtaining the voltage of a PCB temperature-sensitive resistor in a controller of the electric power steering system when a vehicle is powered on; controlling a motor of the electric power steering system to output a detection signal, and collecting a starting current of the motor under the detection signal; based on the PCB temperature-sensitive resistor voltage, the starting current and a preset offline three-dimensional mapping table, the estimated initial temperature of a steering column of the electric power steering system is determined, then the basic compensation torque of the electric power steering system is determined, the real-time compensation torque of the electric power steering system in the operation process is determined, and torque compensation processing is carried out. The estimated initial temperature of the steering column is accurately calculated through the voltage of the PCB temperature sensitive resistor and the starting current of the motor under the detection signal, low-temperature friction compensation is more accurate, hardware such as a temperature sensor does not need to be additionally added, and therefore the hardware cost and the assembly complexity are prevented from being increased.

An electric powered steering assembly includes a housing with a cylindrical portion, an interior wall of the cylindrical portion defining a first and second grooves extending in an axial direction, the first and second grooves having inwardly tapered walls. A ball screw is disposed in the housing, extending in the axial direction, and defining a through hole extending in a radial direction having a first and second ends. A ball nut is disposed in the housing surrounding the ball screw and configured to rotate relative to the housing. A first anti-rotational pin is disposed in the first end of the through hole, a second anti-rotational pin is situated in the second end of the through hole, and a spring is disposed between the anti-rotational pins. The spring is configured to bias the first and second anti-rotational pins in a radially outward direction towards the first and the second groves respectively.

A vehicle control device includes: an input image acquirer that acquires an input image; a target steering amount calculator that calculates a target steering amount based on the input image; and a steering controller that manipulates an electric power steering to a positive side or a negative side based on the target steering amount. The target steering amount calculator is configured to execute: processing of recognizing a positive-side dividing line LP and a negative-side dividing line LN of the vehicle; processing of calculating at least either one of a positive-side area value between a neutral reference line L0 determined virtually and the positive-side dividing line LP, and a negative-side area value between the neutral reference line L0 and the negative-side dividing line LN; and processing of calculating the target steering amount based on at least either one of the positive-side area value and the negative-side area value.

The present embodiments relate to a control device and method for an electric power steering (EPS) system, and an EPS system including the same. A control device according to an embodiment may include a steering controller configured to control a rotation of a motor linked to a steering wheel or a wheel of a vehicle, and a wake-up circuit configured to, in an ignition-off state of a vehicle, wake up the steering controller using a change in current consumption of a motor rotation detection element due to forced rotation of the motor by external force, wherein the steering controller may apply a reaction torque to the motor to suppress the forced rotation of the motor after waking up.

The rear wheel electric power steering gear assembly comprises a shell, a linear reciprocating motion mechanism and an electric drive assembly, a first containing cavity and a second containing cavity are formed in the shell, and the first containing cavity is formed in the first direction and externally penetrates through the first containing cavity to form two shaft holes; the second accommodating cavity is annularly arranged and communicated with the circumferential direction of the first accommodating cavity; the linear reciprocating motion mechanism comprises a nut, a rolling bearing assembly, a threaded rod and two transmission shafts, and the two transmission shafts are slidably connected to the two shaft holes respectively; the nut is supported in the second containing cavity through the rolling bearing assembly. The threaded rod penetrates through the first containing cavity and the second containing cavity, one end of the threaded rod is connected with a transmission shaft, and the other end of the threaded rod penetrates through the nut and is connected with the other transmission shaft. The threaded rod is in threaded engagement with the nut, and the thread is configured to be a trapezoidal thread; the driving end of the electric driving assembly extends into the second containing cavity from the outside of the shell to be in transmission connection with the nut so as to drive the nut to rotate forwards or backwards. According to the invention, steering assistance can be provided for the rear wheels, and mechanical self-locking is realized.

The invention discloses a method, device and equipment for remotely controlling vehicle steering and a storage medium, and the method comprises the steps: obtaining the state of an electric power steering system, the vehicle speed, the torque of a steering wheel and the state of an angle sensor when a steering signal of remote control equipment is received; determining whether the state of the electric power steering system, the vehicle speed, the torque of a steering wheel and the state of an angle sensor meet preset conditions or not, and if yes, determining a target steering angle based on the steering signal; acquiring a current actual steering angle based on the steering angle sensor, and determining a target steering wheel rotating speed based on the current actual steering angle and the target steering angle; acquiring a current actual steering wheel rotating speed, and determining a target steering motor torque based on the current actual steering wheel rotating speed and the target steering wheel rotating speed; and based on the target steering motor torque, a motor of the electric power steering system is controlled, so that steering of the vehicle is completed. The steering of the vehicle is controlled more accurately, and better control experience is provided for a driver.

The invention discloses a vibration reduction method based on a stator offset auxiliary slot permanent magnet motor. In-depth research on radial electromagnetic force waves causing vibration of the permanent magnet motor finds that the radial electromagnetic force waves are mainly composed of a no-load component and a load component, and a certain phase difference exists between the no-load component and the load component. A stator offset auxiliary slot structure is provided, as shown in figure 1, through optimization of an offset angle bnotch and an offset size Rnotch of the auxiliary slot, a phase difference between a no-load component and a load component of a radial electromagnetic force can be 180 degrees, and the sizes of the no-load component and the load component are similar, so that the amplitude of an electromagnetic force wave can be greatly reduced. The radial vibration acceleration of the motor is weakened by at least 50%. A permanent magnet servo motor system, an automobile electric power steering system, a permanent magnet direct drive wind power generation system and the like can be used.

The invention discloses an assembling structure and method for a pure electric steering gear with double speed reducing mechanisms, and relates to the technical field of pure electric steering gear. According to the structure, a speed reducing shell and a motor controller are arranged on a steering gear shell, and a first-stage speed reducing mechanism composed of a small gear and a large gear is sequentially arranged in the speed reducing shell; one end of the worm is connected with the large gear through a transmission balance shaft, and a spring and a bearing are arranged in the transmission balance shaft to achieve radial elastic supporting and mechanical balance. The assembling method is carried out according to the sequence of the self-adaptive adjusting assembly, the worm, the transmission balance shaft, the speed reduction shell, the steering gear shell and the motor controller, and through a rotation test, the meshing clearance of the gear pair and the worm and gear pair is subjected to self-adaptive compensation by utilizing elastic deformation of a spring and a rubber element. Under the condition of a single motor, a large total transmission ratio and a large steering output torque are obtained, and meanwhile transmission stability, noise vibration performance and long-term use reliability are considered.

The utility model provides a redundancy device, an electric power steering system and a vehicle, and the redundancy device comprises a control unit which is used for receiving the adjustment data of a steering wheel and outputting a drive control signal; and the first execution unit and the second execution unit are connected with the control unit and are used for receiving the driving control signal and controlling a motor to operate based on the non-faulted one of the first execution unit and the second execution unit when one of the driving control signal is faulted. The electric power steering system can meet the safety requirement of the highest risk level of the safety integrity level of an automobile, the driving safety of the automobile is improved, and the safety of a driver, passengers, the automobile, pedestrians and the like is guaranteed.

The invention belongs to the technical field of light passenger car manufacturing and assembling, and particularly relates to a self-adaptive transmission structure of an electric power steering gear and a steering pull rod, which comprises a steering column, an electric power steering gear body, a power motor, a speed reducing mechanism, the steering pull rod and a self-adaptive adjusting assembly. According to the self-adaptive power-assisted steering system, the stress and displacement change of the steering pull rod is detected through the sensor, and the controller adjusts the power-assisted motor accordingly to realize self-adaptive power-assisted steering. The speed reducing mechanism adopts multi-stage gear transmission, the length of a steering pull rod is adjustable, and the angle of a steering column is adjustable; the lubricating system automatically lubricates key parts, the controller has multiple steering modes and is in linkage with the air suspension, steering comfort, transmission efficiency and system reliability are improved, cooperative work of a chassis system is achieved, and the advantages of being convenient to install and maintain, high in compatibility and the like are achieved.