376 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 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.

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 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.

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.

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.

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.

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 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.

A cover for a worm wheel gear box for a steering system and an electric power steering system for a vehicle. The cover comprises a substantially disc or dome shaped cover body configured to cover an opening of the worm wheel gear box. The cover body includes an inner surface configured to face the worm wheel gear box and an opposite outer surface. The cover body includes a sealing portion formed on the inner surface and configured to sealingly engage an outer circumference of the opening of the worm wheel gear box. The cover body includes a first attachment means and a second attachment means for mounting the cover body to the worm wheel gear box. The first attachment means and the second attachment means are provided at substantially diametrically opposed positions of the cover body. The cover body includes a reinforcement structure reinforcing the cover body.

A drive device according to the present disclosure includes: a motor including a motor main body having a rotor and two sets of windings, a frame configured to accommodate the motor main body, and a housing fitted to the frame; and a control unit attached to the motor and configured to control a current supplied to the two sets of windings, in which the control unit includes a wiring board having a first surface facing the housing and a second surface opposite to the first surface, a first inverter circuit and a second inverter circuit configured to independently supply a current to each of the two sets of windings, and a CPU configured to control the first inverter circuit and the second inverter circuit, a first switching element constituting the first inverter circuit is disposed on the first surface of the wiring board, and a second switching element constituting the second inverter circuit is disposed on the second surface of the wiring board.

The utility model relates to the technical field of steering systems, in particular to a deflection measuring tool for a rack of a steering engine. A steering engine rack deflection measuring tool comprises a bottom plate, a fixed end assembly and a load end assembly, and is characterized in that the fixed end assembly, an input end assembly, a servo end assembly and the load end assembly are sequentially connected to the bottom plate from left to right; bases of the fixed end assembly, the input end assembly, the servo end assembly and the load end assembly are connected with the bottom plate through bolts. The input end assembly is a pressing block fixing tool, and the servo end assembly is a pressing block fixing tool or a parallel shaft type steering engine servo tool. Compared with the prior art, the tool for measuring the deflection of the rack of the steering engine is convenient for carrying out research on the deflection of the rack, provides data support for arrangement of the steering engine and type selection of gears and racks, and can measure the deflection of the racks of various types of steering engines including a double-gear type electronic steering engine and a parallel shaft type electric steering engine.

To provide a controller for a rotary electric machine and an electric power steering apparatus which can suppress the error increase of the rotational angle due to the high frequency noise component included in the current detection value, while reducing the AC component error included in the sensor detection value of rotational angle, at high rotational speed. A controller for a rotary electric machine estimates an estimation actual angle deviation; calculates a detection angle deviation; calculates a control angle deviation by dividing internally between the estimation actual angle deviation and the detection angle deviation; calculates a rotational angle for control by performing feedback control so that the control angle deviation approaches 0; and makes the ratio of the estimation actual angle deviation higher than the ratio of the detection angle deviation, when the rotational speed is higher than a speed threshold value.

The present application belongs to the technical field of vehicles. Disclosed are a steering angle neutral position compensation control method and apparatus for an electric power steering system, and a vehicle and a storage medium. On the basis of initial neutral position calibration information of a TAS sensor, preset rotor neutral position information of a rotor of an electric motor is correspondingly obtained; when a vehicle is in a travelling-straight state, a steering wheel neutral position reference value is acquired; and vehicle rotor steering angle position information is acquired, and after the latest acquired steering wheel neutral position reference value is used for performing deviation determination, calculation is performed on the vehicle rotor steering angle position information having a relatively large deviation using the steering wheel neutral position reference value that meets a duration condition and has been subjected to self-learning, so as to obtain a high-precision target steering wheel steering angle value.

This invention provides an electric motor, an electric power steering system, and a vehicle. The motor includes a stator core, a rotor core, and an air gap. The rotor core is located inside the stator core, and the air gap is located between the rotor core and the stator core. The axial height Ls of the stator core, the outer diameter Dso of the stator core, the stator split ratio k of the stator core, the axial height Lr of the rotor core, and the width lg of the air gap satisfy the following: This application optimizes the dimensional relationship between the stator core, the rotor core, and the air gap between them. Without increasing the number of components, it effectively solves the problem of motor performance degradation caused by end magnetic leakage, thereby reducing cogging torque, suppressing torque pulsation, increasing the average torque of the motor, and improving motor vibration and noise. While ensuring motor performance, it can minimize motor weight and reduce production costs.

1. Name of the product in this design: Body of a drive unit for electric power steering. 2. Purpose of this design: This product is an electric power steering actuator for driving a driven body in electric power steering, and the part to be protected is the main body of the electric power steering actuator. 3. The key design features of this product are the shape of the part to be protected. 4. The picture or photo that best illustrates the key design points: Design 1 3D diagram 1. 5. Design 1 is designated as the basic design. 6. Other situations requiring explanation: A is the motor, B is the worm gear unit, C is the flange, and D is the reduction unit. 7. Other situations requiring explanation: This design patent requires partial design protection. The parts indicated by solid lines are the parts for which protection is required, and the parts indicated by dashed lines are the parts for which protection is not required.

The utility model discloses a novel commercial vehicle electric power steering gear test bench, which is characterized in that the novel commercial vehicle electric power steering gear test bench comprises a servo motor assembly, a torque transmission assembly and a mechanical support assembly, the servo motor assembly comprises a servo motor and a multi-stage speed reducer, and an output shaft of the servo motor is connected with an input end of the multi-stage speed reducer through a coupler; the torque transmission assembly comprises a tested electric power steering gear mounting bracket and an output shaft connecting flange, and the output end of the multi-stage speed reducer is connected with an output shaft of the tested electric power steering gear through the output shaft connecting flange; the mechanical supporting assembly comprises a base frame, a damping device and an adjustable steering wheel support, the servo motor assembly, the tested electric power steering gear installation support and the adjustable steering wheel support are fixed to the base frame, and the damping device is arranged at the bottom of the base frame.

The electric power steering system (100) includes: an electric motor (110) that imparts a driving force to the wheels for operation of the steering wheel; and a control device (10) that estimates the degree of gradient in the transverse direction of the road on which the vehicle is traveling, determines a correction current for correcting the target current required to generate the driving force of the electric motor based on the estimated degree of gradient, and controls the drive of the electric motor by correcting the target current using the correction current.

The application discloses an electric power steering system automation production line, which comprises a ground conveying line, a tray, a partition wall, a processing mechanism, a first air conveying line, a second air conveying line and a feeding track; the processing mechanism comprises a rack assembly mechanism and an inner pull rod assembly mechanism; the rack assembly mechanism comprises a first mounting table, a rack feeding conveying device and a rack positioning and mounting device; the inner pull rod assembly mechanism comprises a second mounting table, and the second mounting table is provided with a tray positioning assembly and an inner pull rod mounting assembly. The application realizes automatic and stable feeding, accurate radial positioning and coaxiality detection of the rack, and accurate axial assembly of the rack to the workpiece, and greatly improves the rack assembly precision and operation efficiency.

A steering angle estimation device of an electric steering system. A first operator calculates a yaw rate. a second operator calculates an average value of rear wheel speeds. A Kalman filter predicts a yaw acceleration by filtering the yaw rate. A third operator estimates a steering angle also taking into account a slip angle by using the yaw rate and the yaw acceleration. A weight adjuster adjusts weights of the wheel speeds by averaging rear right and left wheel speeds calculated by the second operator. A multiplication operator multiplies weight values output by the weight adjuster with the steering angle. A steering angle conversion switch outputs a final steering angle by selecting the estimated steering angle output from the multiplication operator or a motor steering angle measured from a motor of a motorized power steering system by the weight values.

The application discloses a kind of electric power steering system torque sensor failure processing method, comprising the following steps: step 1, when detecting that vehicle electric power steering system torque sensor completely fails, open torque sensor failure processing procedure;Step 2, electric power steering system real-time acquisition external input signal;Step 3, when torque sensor completely fails, freeze current assist motor torque value;Step 4, to frozen assist motor torque value is safety boundary value limit;Step 5, detect driver steering behavior is straight, turn or change direction;Step 6, according to driver steering behavior determines the processing mode of current assist motor torque value and assist torque decrement slope value, and the assist motor torque value is reduced 0;Step 7, real-time monitoring assist motor torque value, when assist motor torque value is incremental, then cut off assist motor torque value output to 0.

The invention discloses a motor rotor angle determination method, system and device and a medium, and relates to the technical field of motor detection.The method comprises the steps that angle collection is conducted on a rotor of an electric power steering motor in real time through a magnetic encoder, and a real-time detection angle is obtained; acquiring a historical amplitude, a historical angle tracking error and a historical zero offset value output by the zero offset compensation adaptive wave trap after previous angle acquisition, and a historical angle output by the phase-locked loop; performing adaptive processing based on the real-time detection angle, the historical amplitude, the historical angle tracking error, the historical angle and the historical zero offset value by using a zero offset compensation adaptive wave trap to obtain a real-time reference signal; and inputting the real-time reference signal into a phase-locked loop for angle tracking error compensation to obtain a real-time target angle of the rotor. According to the invention, continuous signal processing can be directly carried out through the zero offset compensation adaptive wave trap and the phase-locked loop, and the calculation amount and noise influence are reduced, so that the result accuracy can be improved.