656 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.

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 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.

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 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 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 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 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.

Provided are an electric drive device and an electric power steering device that reduce noise superimposed on a detection value detected by a current detection element in a path from the current detection element to a control circuit. The electric drive device includes a motor and an electronic control device including a circuit board. With a position on an extension line in an axial direction of a shaft as a reference position, a mounting area for a first motor driver circuit, a mounting area for a first current detection element, a mounting area for a plurality of drive elements of a first inverter circuit, and a disposition area for a first coil wiring are disposed in this order from the reference position to one side in a first direction.

A straddled vehicle with electric power steering including: a front fork including a left leg and a right leg extending in an up-down direction; an upper bracket supporting the front fork; a steering shaft disposed between the left and right legs, and extending in the up-down direction, the upper bracket rotating together with the front fork about an axis line of the steering shaft; a handlebar holder attached to the upper bracket and supporting the handlebar; and a torque sensor detecting a steering torque, the torque sensor including an input shaft extending in the up-down direction. The handlebar holder includes: a torque sensor support holder attached to the upper bracket, and a handlebar support holder rigidly fixed to the torque sensor support holder with a relative position therebetween changeable.

This AC motor control device comprises: a current detector; a first coordinate converter that converts a detection current before conversion, which is the detection result detected by the current detector, into a two-axis detection current which is a current on two rotating axes; a two-axis current filter that reduces the noise component of the two-axis detection current; a second coordinate converter that converts the filtered two-axis current into a filtered three-phase current in a stationary coordinate system; a first controller that generates a first three-phase voltage command on the basis of the two-axis detection current or the filtered two-axis current; a second controller that generates a second three-phase voltage command on the basis of the filtered three-phase current; and an inverter that applies a voltage to an AC motor on the basis of the first and second three-phase voltage commands.

The invention discloses a CAN network fault-tolerant automatic test system and method for an electric steering system, and relates to the technical field of CAN network testing, and the system comprises an upper computer module and a test tool. The test tool comprises an MCU and a switch array. The switch array comprises a plurality of controlled chip switches and relay switches. The test tool receives a test sequence message of the upper computer through the CAN bus and controls the switch array to act so as to inject a fault into the EPS or recover communication; and the upper computer module also receives a reply message of the EPS and generates a fault-tolerant test result. A CAN fault-tolerant test tool is formed by a switch array composed of a plurality of controlled chip switches and relay switches, a test sequence message of an upper computer test script is received to carry out various fault tests, whether a test result is qualified or not is analyzed according to a feedback EPS message, multiple fault-tolerant ability tests including Busoff fast and slow recovery time can be automatically carried out, and the fault-tolerant ability test efficiency is improved. And the development and test cost is reduced.

The invention discloses an active aligning force adjusting method for a commercial vehicle under different load conditions, relates to the technical field of active adjustment of steering wheels, and provides a torque adjusting method for the active aligning function of an electric power steering system of the commercial vehicle. The steering return performance problems of insufficient steering return, return overshoot, neutral position swing and the like of an existing commercial vehicle due to the load working condition can be effectively solved.

This utility model discloses an electric drive assembly, including a motor body, a connector, and a control circuit board. The motor body includes a housing and a motor structure installed within the housing. The windings of the motor structure are led out of the housing through multiple pins and arranged parallel to each other along a first direction. The connector includes a socket and a terminal block located on the socket. The socket is detachably fixedly connected to the housing, and when the socket is connected to the housing, the terminal block and the pins are oriented in the same direction. The control circuit board is connected to the housing along the first direction. Both the pins and the terminal blocks are inserted into the control circuit board along the first direction and are electrically connected to the control circuit board. The utility model also discloses an electric power steering system and a vehicle having the same assembly. The control circuit board of this utility model can simultaneously connect to the pins and terminal blocks during installation, which not only ensures precise positioning and convenient operation but also avoids mechanical stress at the electrical connection points during fixed installation, improving the reliability of the connection between the connector and the control circuit board.

The invention relates to the technical field of manual forklifts, and discloses a forklift internal electric power steering device which comprises an electric power unit, forks are symmetrically mounted on the outer surface of the electric power unit, supporting wheels are mounted at the bottoms of the sides, away from the electric power unit, of the forks, and a bearing frame is mounted on the side, away from the forks, of the electric power unit; a handle is mounted at the top of the bearing frame, a driving part is mounted at the bottom of the handle, an aligning and centering assembly is arranged in the pallet fork, the aligning and centering assembly comprises rotating grooves which are linearly distributed at equal intervals and symmetrically formed in the pallet fork, and the rotating grooves abut against the ground through auxiliary wheels at different positions; the auxiliary wheel and the driving wheel jointly form two key point positions for bearing the gravity of the goods, the two key point positions can be automatically adjusted till the goods are located at the relatively-centered position, then it is guaranteed that the goods are kept balanced on the pallet fork, and therefore the problem that in the prior art, the goods are difficult to be accurately positioned in the middle of the pallet fork is effectively solved through the structure.

1. Name of the product in this design: Electric power steering controller assembly. 2. Purpose of this design: for electric power steering control in automotive steering systems. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

This application provides an electronic control unit, an assembly method, and an electric power steering system. The electronic control unit, used in the electric power steering system, includes a connector and a circuit board assembly. The circuit board assembly includes a first circuit board and a second circuit board arranged in layers. The first circuit board is electrically connected to the connector. The first circuit board and the second circuit board are connected by a flexible circuit board for signal connection and by a power-supply connector for current connection. The control module of the electronic control unit is integrated on the first circuit board, and the filtering module, drive module, and position detection module of the electronic control unit are integrated on the second circuit board. This double-layer circuit board arrangement saves structural space of the control unit with redundant design and also improves its assembly efficiency.

The utility model discloses an electric power steering gear sealing structure, and relates to the technical field of electric power steering gear sealing, the electric power steering gear sealing structure comprises a shell and an input shaft, a double-sealing assembly is arranged at the joint of the input shaft and the shell, the double-sealing assembly comprises a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, the second sealing ring is arranged on the input shaft in a sleeving mode and located at the inner side end of the shell; and the dustproof cover is connected to the outer side of the shell. The first sealing ring and the second sealing ring form a double-sealing defensive line, dynamic sealing and static sealing are combined, the leakage probability of lubricating grease is remarkably reduced, meanwhile, multi-stage blocking is formed on external pollutants, the protection capacity of internal components of the steering gear is improved, the corrugated pipe dust cover is matched with a hoop to be fixed, the exposed part of the input shaft is tightly wrapped, and the service life of the steering gear is prolonged. The telescopic structure adapts to movement of the input shaft, long-term dustproof and waterproof effects are guaranteed through wear-resistant and weather-resistant materials, and damage of pollutants to the interior of the steering gear is reduced.

The application provides a kind of steering gear autonomous zero calibration control system and method, system includes: data acquisition module: for obtaining the bus message information required;Vehicle mass calculation module: for calculating vehicle mass;Steering wheel angle calculation module: for calculating the corresponding steering wheel sensor angle value;Tire pressure calculation module: receiving tire pressure sensor measured tire pressure;Straight travel judging module: for in steering controller, according to the wheel rotation angle sensor obtained wheel rotation angle judges whether vehicle is in straight travel state;Zero angle control module: for vehicle zero angle control calibration;Data storage module: for when vehicle learns new zero angle data, save data to corresponding NVRAM.The application solves the problem that when vehicle zero angle deviates from zero due to changes in vehicle mass and tire pressure, causing the steering wheel to be incorrect.

The invention relates to a fatigue test device for an automobile electric power steering system assembly, and belongs to the technical field of new energy automobile accessory testing, the fatigue test device comprises a test machine body and an automobile electric power steering gear device arranged outside the test machine body, the test machine body comprises a base, a vertical plate, a hydraulic cylinder, a moving plate and a steering fatigue test machine, a knocking structure for periodically knocking the automobile electric power steering gear device is arranged outside the moving plate, the automobile electric power steering gear device comprises an automobile electric power steering gear body and a steering wheel, and an inclination structure for performing inclination adjustment on the steering fatigue testing machine is arranged at the top of the base. The fatigue test device for the automobile electric power steering system assembly has the advantages of being high in test accuracy and the like, synchronous simulation of steering, knocking and inclination is achieved, complex dynamic loads in actual driving are effectively restored, and the test accuracy, comprehensiveness and reliability are remarkably improved.

The invention discloses a simulation experiment system specially used for verifying a steering control strategy in an automobile electric steering controller. The simulation experiment system comprises a platform rack, an automobile electric power steering gear assembly, a platform measurement and control device, a variable damping device, a vehicle speed signal simulator and an EPS control unit. The variable damping device is arranged between the transverse pull rod and the platform rack and comprises a tension sensor, a U-shaped rod, a connecting plate, a variable damper, a return spring and a displacement sensor; the displacement sensor, the variable damper and the return spring are installed between the connecting plate and the platform rack in parallel, the EPS control unit is electrically connected with the steering torque sensor, the power-assisted motor and the vehicle speed signal simulator, and the platform measurement and control device is electrically connected with the EPS control unit, the displacement sensor, the damping control electromagnetic valve and the tension sensor. During experimental operation, various operation data are transmitted to the platform measurement and control device, and steering power-assisted characteristics under various working conditions can be obtained after processing.

An electric power steering apparatus is provided, including a casing; a steering shaft, disposed in the casing in an axially reciprocal manner and extending from two ends of the casing, and the body thereof having a rack portion and a screw portion; a planetary roller nut, assembled in the casing and screwed to the screw portion; a motor, controlled by the ECU, disposed in the casing, and having an external rotor, and the external rotor being coupled to the planetary roller nut to drive the motor to rotate, further driving the steering shaft to reciprocate in the casing; a first waterproof ring, provided between the planetary roller nut and the casing, and a second waterproof ring, placed between the planetary roller nut and the hollow stator of the motor, thus forming an airtight and waterproof efficacy for the motor to prevent the motor from losing power.

The application discloses an EPS motor current monitoring method based on single-resistance time-sharing sampling, relates to the technical field of electric power steering control, and comprises the following steps: sampling two-phase currents flowing through a single sampling resistor respectively; wherein the single sampling resistor is arranged on an inverter bridge DC bus; in a PWM period, the conduction combination of three-phase MOS tubes of the inverter bridge is controlled, so that the two-phase currents of the motor flow through the single sampling resistor in a time-sharing mode, and the two-phase currents are time-sharing sampled in a non-zero vector state; and according to the two-phase currents, a third-phase current is calculated according to the Kirchhoff's current law. The monitoring and time sequence control strategy of the three-phase motor current are realized through single-resistance time-sharing sampling, and the method is suitable for the design of an EPS controller meeting the safety level requirement.