1308 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.

In a vehicle steering assist device that includes an electric power steering device that generates a control torque that modifies a return torque for urging a steering wheel to a neutral position, a steering assist ECU that controls the control torque, and a surrounding information detecting device (camera sensor, radar sensor) that detects at least information in front of a vehicle, the control torque is controlled such that a ratio of a change amount of the modified return torque to a change amount of a steering operation amount at the start of avoidance steering decreases when an obstacle is detected in front of the vehicle by the surrounding information detecting device and the avoidance steering for the vehicle to avoid collision with the obstacle is determined to be required.

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.

A control device that controls a control target including at least a motor in a steering mechanism including an input shaft to which a steering wheel is connected, an output shaft connected to the input shaft via a torsion bar, and the motor connected to the output shaft. The control device includes a reaction force controller to generate an input torque input to the control target based on a torsion bar torque generated in the torsion bar and to control a reaction force transmitted from the steering wheel to the steering person, and an assist controller to generate a correction torque to correct the input torque based on an output of the control target and a nominal model. The assist controller is configured or programmed such that a transfer function of the control target is constrained by a transfer function of the nominal model in a frequency band.

A vehicle control controller is configured to acquire information on an obstacle in front of a vehicle acquired by an external world recognition device, and to output, based on the acquired obstacle position and own vehicle position, a first notification command for controlling a notification unit so as to give to a driver a notification for urging the driver to avoid touching a steering wheel when transitioning to an autonomous emergency avoidance steering mode for avoiding the obstacle based on control by an electric power steering device.

A method for performing hysteresis shaping in a steer-by-wire (SbW) steering system of a vehicle includes determining a desired hysteresis associated with rotating a handwheel of the vehicle, determining, based on the desired hysteresis, whether to perform hysteresis subtraction or perform hysteresis addition, in response to a determination to perform hysteresis subtraction, calculating a hysteresis subtraction value, modifying an estimated rack load based on the hysteresis subtraction value, and generating a reference torque based on the estimated rack load as modified based on the hysteresis subtraction value, in response to a determination to perform hysteresis addition, calculating a hysteresis addition value and generating the reference torque based on hysteresis addition value, and controlling the handwheel based on the reference torque.

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.

A resolver body including a rotor having Nx (Nx is a natural number) salient poles, a stator facing the rotor and having Ns (Ns is an integer equal to or larger than 3) teeth arranged in a circumferential direction, and an excitation winding and two phases of output windings wound on each tooth; and an excitation circuit configured to apply voltage to the excitation winding. The excitation winding and the two phases of output windings wound on each of Nsm (Nsm is an integer equal to or larger than 2) teeth among the Ns teeth are set to be of a main system. The excitation winding and the two phases of output windings wound on each of Ns-Nsm teeth are set to be of a sub-system. The number Nsm of the teeth corresponding to the main system is larger than the number Ns-Nsm of the teeth corresponding to the sub-system.

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.

A motor control device includes a model following controller to generate a correction torque based on an output from a control target that is a motor, and correct an input to the control target with the correction torque. A model following controller includes a high-pass filter with a first cutoff frequency and a low-pass filter with a second cutoff frequency larger than the first cutoff frequency, and is configured or programmed so that a transfer function of a control target is constrained to a nominal model in a frequency band in which a gain in a gain characteristic of Q(s)·HPF(s) is 1 where Q(s) is a transfer function of the low-pass filter and HPF(s) is a transfer function of the high-pass filter.

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.

An electric rotating machine apparatus includesan electric rotating machine having a windings and an output axle,a power module having a switching device connected with the winding,a bus bar that is held by a bus-bar holder and is included in a power-supply path to the power module,two or more smoothing capacitors connected with the bus bar, anda capacitor holder in which at a more outer side in the radial direction of the electric rotating machine than the bus-bar holder is, the two or more smoothing capacitors are arranged in the axial direction of the electric rotating machine, and that holds the two or more smoothing capacitors from the outer circumferential side of the electric rotating machine.

The invention discloses a gear type automobile electric power steering gear, and belongs to the technical field of automobile steering gears. Comprising a shell, the top of which is provided with a device shell; the boosting shaft is arranged in the shell in a sliding manner; the oil box is detachably arranged at the bottom of the shell, and a filter plate used for filtering lubricating oil is arranged on the inner side of the oil box; the circulating mechanism is arranged on one side of the shell, and the circulating mechanism is used for sucking out the filtered lubricating oil in the oil box and injecting the lubricating oil into the device shell; and the driving motor is arranged at the top of the oil box, the driving motor can drive the boosting shaft to move in the shell, and the circulating mechanism is driven by the driving motor. According to the technical scheme, the oil box is adopted to filter the lubricating oil, and the lubricating oil is sucked and pressed in through the circulating mechanism, so that the lubricating oil is circulated, and the technical effect that impurities in the commutator can be cleaned to reduce the influence on the protection performance of the lubricating oil is achieved.

A motor control device includes a torque controller to operate based on a steering torque and to give an input to a control target that is a motor, and a model following controller to generate a first correction torque based on an output from the control target. A model following controller includes a high-pass filter to remove a low frequency component from a first correction torque, a friction compensation calculator that is coupled in parallel to the high-pass filter to apply friction compensation to the first correction torque to calculate an estimated value of a mechanical friction torque, and an adder to add the estimated value of the friction torque to the first correction torque from which the low frequency component is removed by the high-pass filter to generate a second correction torque and feed back the second correction torque to an input to the control target.

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.

To provide a controller for rotary electric machine and an electric power steering apparatus which can increases decreases an increase amount of the current of d-axis in the negative direction appropriately, and can perform the weakening magnetic flux appropriately, irrespective of increase and decrease in the rotational angle speed, without using the information on the inductance and the interlinkage flux of the rotor. A controller for rotary electric machine, in a case where the current command value of q-axis is a positive value, changes the current command value of d-axis, based on a deviation between an offset q-axis current command value obtained by subtracting the q-axis offset value of the positive value from the current command value of q-axis, and the current detection value of q-axis.

A method for performing diagnostics on a steering system of a vehicle includes: controlling an electric power steering (EPS) gear of the steering system to apply a force to the steering system according to a predetermined torque characteristic; receiving a signal corresponding to a measurement response of the steering system caused by the predetermined torque characteristic; comparing the received signal with an expected response of the steering system; and generating an output including a diagnosis of the steering system based on a comparison between the received signal and an expected response of the steering system.

The invention relates to the technical field of torque angle sensors, in particular to a torque angle sensor of an electric power steering system, which comprises a shell, a magnet driven gear assembly, an input rotor, a PCB (printed circuit board), a cover plate and an output rotor, rotor blades, a driving gear and a rotor sleeve are integrally arranged; the rotor blade is used for generating an induced magnetic field, and the driving gear and the magnet driven gear set rotate in a meshed mode; the magnet driven gear set is formed by magnet insert injection molding, and the magnet driven gear set is provided with a magnet used for generating a magnetic field so as to influence sensing of the angle chip. The input rotor is integrally formed through insert injection molding, the magnet driven gear set is formed through magnet insert injection molding, and the follow-up installation technology and installation steps are simplified. The technical problems that in the prior art, friction noise between the input shaft and the upper shell is large, the technology is complex, and the number of installation steps is large are solved.

A motor control device according to the present disclosure includes: a motor drive circuit that outputs a drive current to a motor; a drive current detector; a main control unit, and an auxiliary control unit, wherein the main control unit has a first control signal generator that generates a first control signal based on a detected current signal; a first drive signal generator that generates a drive signal based on the first control signal, and a first switcher that switches to an output state of the motor drive circuit of the drive signal, and the auxiliary control unit has a second control signal generator that generates a second control signal; a second drive signal generator that generates the drive signal based on the second control signal, and a second switcher that switches to an output state of the motor drive circuit of the drive signal.

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.