CN205469271U - EPS is with integration rotation direction sensor - Google Patents

Abstract

An integrated steering sensor for EPS relates to a steering sensor. The purpose of the utility model is to solve the problem of high cost and large space occupation of the existing single sensor stacking method, and the two signals are input into the control system independently of each other, resulting in complicated control calculation engineering. The steering sensor of the utility model includes a torque measurement module and an angle measurement module, wherein the torque measurement module adopts a Hall-type torque measurement device, including a multi-stage magnetic coil, a double-layer tooth yoke, a magnetic collecting end and a Hall chip HAL815. The reluctance angle measurement device used in the rotation angle measurement module includes a radially magnetized permanent magnet and a Hall chip AS5147, and the multi-turn measurement of the absolute angle is achieved by amplifying the rotation angle through multi-stage gears. The two measurement modules are connected by a flexible cable to achieve unified output of signals while avoiding mutual interference.

Description

Integrated steering sensor for EPS

technical field

The utility model relates to a steering sensor for automobile EPS, in particular to a magnetoresistive non-contact angle torque integrated sensor, which is used to measure the torque of the torsion bar in the steering wheel and the absolute rotation angle of the steering wheel during the rotation of the steering wheel. Automobile steering control technology field.

Background technique

The electric power steering system (EPS) of a car controls the motor to provide assistance for the steering of the car to improve the driving comfort of the driver during the steering process, while the steering sensor in the EPS system provides torque and angle signals for the steering control system, and the control motor provides Steering assist assists steering and steering wheel return. With the improvement of EPS performance requirements and the development of automobile chassis integration technology, it is required to be equipped with torque and rotation angle signal sensors in the EPS system. At present, in China, a single sensor is the main method, and most of them are superimposed using individual sensors. This method not only costs a lot, takes up a lot of space, but also the two signals are input to the control system independently of each other, which makes the control calculation engineering complicated. At present, only a few foreign auto parts companies have developed torque-angle integrated sensors that occupy a major market share. Therefore, it is of great significance to design and develop a torque-angle integrated steering sensor suitable for the automotive environment, small in size, low in cost, reliable in performance, and highly integrated to further improve the performance of EPS and improve the integration of automotive control systems.

Utility model content

A brief overview of the present invention is given below in order to provide a basic understanding of certain aspects of the present invention. It should be understood that this summary is not an exhaustive summary of the invention. It is not intended to identify the key or important part of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

In view of this, according to one aspect of the utility model, the utility model aims to propose an integrated steering sensor for EPS with a high degree of integration, simple structure, and internal interference-free torque and angle measurement, so as to realize EPS steering The input torque of the system and the absolute rotation angle of the steering wheel are measured to solve the problem of high cost and large space occupation of the superimposed use of separate sensors, and the two signals are input to the control system independently of each other, resulting in complex control calculation engineering.

The integrated steering sensor for EPS proposed by the utility model has a specific structure: the multi-stage magnetic coil is connected to the input shaft, the double-layer tooth yoke is connected to the output shaft, and the double-layer tooth yokes are arranged in a staggered manner, and the tooth pieces of the upper tooth yoke Corresponding to the gap of the lower tooth yoke; the upper magnetic collecting end is fixed in the upper cover by injection molding, the lower magnetic collecting end is fixed in the lower housing by injection molding, the Hall chip HAL815 is welded vertically on the first circuit board, and the first circuit board is fixed on the On the PCB mounting bracket; the PCB mounting bracket is fixed with the lower shell and the upper cover through the positioning holes; the large gear is fixed on the multi-stage magnetic ring through the keyway, and the first pinion and the second pinion are installed on the upper shell through the gear shaft In the positioning groove; the center positions of the first pinion and the second pinion are fixed with radially magnetized permanent magnets through the injection molding process, and at the same time, the second circuit board is arranged under the first pinion and the second pinion, and the second There are two Hall chips AS5147 arranged on the circuit board, and the two Hall chips AS5147 are respectively corresponding to the radially magnetized permanent magnets; the first pinion, the second pinion and the large gear mesh with each other; the first circuit board It is connected with the second circuit board through a flexible cable.

The upper cover, the upper case and the lower case form part of the sensor installation case. The sensor installation housing part is fixedly installed on the EPS steering column without relative movement.

The upper magnetic collecting end is fixed in the upper cover, the lower magnetic collecting end is fixed in the lower housing, and the relative positions of the upper and lower magnetic collecting ends are fixed through positioning and installation.

Further: the multi-stage magnetic coil is connected to the input shaft through a thin-wall bush injected together with it, and the double-layer tooth yoke is connected to the output shaft through a thin-wall bush injected together with it.

Further: the first circuit board is a torque processing circuit board, the second circuit board is an angle processing circuit board, and the two are arranged in opposite positions along the circumference diameter. The two are connected by a flexible cable to realize the transmission of long-distance electrical signals and output signals while avoiding mutual interference.

Further: the plane where the PCB mounting bracket is located is perpendicular to the plane where the lower case is located.

Further: at least two rectangular protrusions are provided on the inner wall of the large gear. Rectangular protrusions are fastened and installed by cooperating with grooves in the injection molded body of the magnetic ring.

The effect achieved by the utility model is:

The sensor of the utility model is installed between the input shaft connected with the steering wheel of the automobile and the output shaft connected with the booster assembly, and is used to measure the torque generated between the input shaft and the output shaft when the steering wheel is turned and the steering wheel is relatively The angle of rotation produced by the car body. The steering sensor includes a torque measurement module and an angle measurement module. The torque measurement module uses a Hall-type torque measurement device, including a multi-stage magnetic coil, a double-layer tooth yoke, a magnet collector and a Hall chip HAL815. The reluctance angle measurement device used in the rotation angle measurement module includes a radially magnetized permanent magnet and a Hall chip AS5147, and the multi-turn measurement of the absolute angle is achieved by amplifying the rotation angle through multi-stage gears. The two measurement modules are connected by a flexible cable to achieve unified output of signals while avoiding mutual interference.

Description of drawings

Fig. 1 is the overall structural diagram of the steering sensor;

Figure 2 is an exploded view of the steering sensor assembly;

Figure 3 is the structure of the upper cover and the magnetic collecting end;

Fig. 4 is a layout diagram of the upper case and gears.

detailed description

Exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Furthermore, it should be understood that, while potentially complex and time-consuming, such development would nevertheless be a routine undertaking for those skilled in the art having the benefit of this disclosure.

Here, it should also be noted that, in order to avoid obscuring the utility model due to unnecessary details, only the device structure and/or processing steps closely related to the solution according to the utility model are shown in the drawings, Other details that have little relationship with the utility model are omitted.

The integrated steering sensor for EPS in this embodiment includes a sensor installation housing part, a processing circuit, a torque measurement module and an angle measurement module, wherein the torque measurement module uses a Hall-type torque measurement device, including a multi-level Ring, double-layer tooth yoke, magnetic collector end and Hall chip HAL815. The reluctance angle measurement device used in the rotation angle measurement module includes a radially magnetized permanent magnet and a Hall chip AS5147, and the multi-turn measurement of the absolute angle is achieved by amplifying the rotation angle through multi-stage gears. The first circuit board and the second circuit board of the processing circuit are connected through a flexible cable to realize unified output of signals between the two measurement modules.

The specific structure of the integrated steering sensor for EPS is that the multi-stage magnetic coil 4 is connected to the input shaft through a thin-walled bush that is injected together with it, and the double-layer tooth yoke 2 is connected to the input shaft through a thin-walled bush that is injected together with it. The sleeve is connected to the output shaft, and the double-layer yokes 2 are arranged in a staggered manner, and the teeth of the upper yoke correspond to the gap of the lower yoke; the upper magnet collecting end 12 is fixed in the upper cover 1 by injection molding, and the lower magnet collecting end 6 is fixed in the lower yoke by injection molding. In the housing 7, the Hall chip HAL815 is vertically welded on the first circuit board, and the first circuit board is fixedly installed on the PCB mounting bracket 3; the PCB mounting bracket 3 is fixed to the lower housing 7 and the upper cover 1 through positioning holes; The gear 5 is fixed on the multi-stage magnetic coil 4 through the keyway, and the first pinion 8 and the second pinion 9 are installed in the positioning groove of the upper housing 10 through the gear shaft, and are connected with the positioning groove through the protrusion on the gear shaft. Obstacle-free relative rotation and axial non-transmission positioning; the center positions of the first pinion 8 and the second pinion 9 are fixed with radially magnetized permanent magnets through injection molding technology, and at the same time, the first pinion 8 and the second pinion The second circuit board is arranged below 9, and an angle processing circuit and two Hall chips AS5147 are arranged on the second circuit board, and the two Hall chips AS5147 correspond to the radially magnetized permanent magnets respectively; the first pinion 8, The second pinion 9 and the large gear 5 mesh with each other to realize signal amplification through multi-stage transmission angles; the first circuit board and the second circuit board are connected by a flexible cable.

When the steering wheel rotates, the multi-stage magnetic coil 4 connected to the input shaft and the double-layer tooth yoke 2 connected to the output shaft rotate relative to each other, and the magnetic field intensity collected by the upper magnetic collecting end 12 and the lower magnetic collecting end 6 changes, and The relative rotation angle is measured by the Hall chip HAL815, and the torque can be calculated by using the calculation method of material mechanics.

When the steering wheel rotates, the multistage magnetic coil 4 rotates with the input shaft, and the large gear 5 connected with the multistage magnetic coil 4 rotates accordingly, and drives the first pinion 8 and the second pinion 9 to rotate, and is installed on the small The radially magnetized permanent magnet in the gear rotates relative to the Hall chip AS5147 on the second circuit board, measures the relative rotation angle of each pinion, calculates the difference between the rotation angles of the two pinions and forms a correspondence with the rotation angle of the steering wheel relation. The number of teeth of the large gear is 44, the number of teeth of the first pinion is 20, and the number of teeth of the second pinion is 22. The absolute angle measurement in the range of ±900° can be realized through difference calculation.

The torque measurement signal and rotation angle measurement signal are connected through FPC flexible cable to realize long-distance power supply and signal transmission. The obtained signal is processed by the single-chip microcomputer and transmitted to the EPS controller through the wire harness. The controller uses this as a basis to control the power-assisted motor to realize power-assisted steering and the steering wheel to actively return to the center.

Although the embodiments disclosed in the present utility model are as above, the content thereof is only for the convenience of understanding the technical solutions of the present utility model, and is not intended to limit the present utility model. Anyone skilled in the technical field to which the utility model belongs can make any modifications and changes in the form and details of the implementation without departing from the core technical solution disclosed in the utility model, but the protection limited by the utility model The scope must still be subject to the scope defined by the appended claims.

Claims (5)

1.EPS integral steering sensor, it is characterised in that: multistage magnetosphere (4) is connected on power shaft, double-layered tooth Yoke (2) is connected on output shaft, and double-layered tooth yoke (2) interlaced arrangement, upper tooth yoke gear piece correspondence lower tooth yoke space；Upper collection Magnetic end (12) is fixed in upper cover (1) by injection, and next part magnetic end (6) is fixed in lower house (7) by injection, Hall chip HAL815 is vertically welded on first circuit board, and first circuit board is fixedly mounted in PCB mounting bracket (3)； PCB mounting bracket (3) is fixed with lower house (7) and upper cover (1) by hole, location；Gear wheel (5) is solid by keyway Being scheduled on multistage magnetosphere (4), the first little gear (8) and two pinion (9) are arranged on upper shell (10) by gear shaft Locating slot in；The center of the first little gear (8) and two pinion (9) is all fixed with radially by Shooting Technique Charging permanent magnet, simultaneously at the first little gear (8) and arranged beneath second circuit board of two pinion (9), the second electricity Being disposed with two Hall chip AS5147 on the plate of road, two Hall chip AS5147 are corresponding with radial magnetizing permanent magnetism body respectively； First little gear (8), two pinion (9) and gear wheel (5) three engage each other；First circuit board and the second electricity Road plate is connected by soft arranging wire.

EPS integral steering sensor the most according to claim 1, it is characterised in that: described multistage magnetosphere leads to Crossing the thin-wall bush being moulded in therewith together to be connected on power shaft, double-layered tooth yoke is by being moulded in thin-wall bush together therewith It is connected on output shaft.

EPS integral steering sensor the most according to claim 1, it is characterised in that: described first circuit board Processing circuit board for torque, second circuit board is that angle processes circuit board.

EPS integral steering sensor the most according to claim 1, it is characterised in that: described PCB installs and props up Frame (3) place plane is vertical with lower house (7) place plane.

EPS integral steering sensor the most according to claim 1, it is characterised in that: described gear wheel (5) Inwall on be provided with at least two rectangular preiection.