Drive Shaft Torque Detection Device and System

Abstract

The present invention provides a drive shaft torque detection device and system, relating to the field of sensor technology. The device comprises: a torque sensor tone wheel, a magnetoelectric torque sensor, and a torque signal processor. The torque sensor tone wheel is fixedly mounted on the shaft head of the drive shaft; the torque sensor tone wheel is provided with magnetic steel assemblies spaced circumferentially; the torque sensor's acquisition end faces the magnetic steel assembly on the torque sensor tone wheel, and the torque sensor is used to collect the induced magnetic field generated by the magnetic steel assembly driven by the rotation of the torque sensor tone wheel. The torque signal processor determines a torque signal based on the induced magnetic field and preset calculation parameters. The preset calculation parameters include: the tail drive shaft torque stiffness value, the maximum torque value, the rated torque value, and the torque angle. By providing the magnetoelectric torque sensor and the associated induced magnetic field generating assembly and signal processing assembly, the measurement accuracy of the drive shaft torque is greatly improved in heavily polluted environments.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a transmission shaft torque detection device and system. Background Art

[0002] Currently, photoelectric torque sensors are used to measure drive shaft torque. During operation and maintenance, photoelectric torque sensors should be carefully protected from strong vibrations and impacts, such as drops and collisions. In particular, the sensor's light-transmitting window should be kept clean to prevent dust, oil, and foreign matter from obstructing the light beam. Obstruction of the photoelectric detection window by foreign matter reduces its light transmittance, affecting the formation of photoelectric pulses and causing significant fluctuations in torque data. Photoelectric torque sensors are susceptible to electromagnetic interference and are difficult to install. High drive shaft speeds can cause dynamic balance issues, resulting in poor measurement accuracy. Summary of the Invention

[0003] The purpose of the present invention is to provide a transmission shaft torque detection device and system, which greatly improves the measurement accuracy of transmission shaft torque in a heavily polluted environment by providing a magnetoelectric torque sensor and a matching induction magnetic field generating component and signal processing component.

[0004] In a first aspect, the present invention provides a transmission shaft torque detection device, comprising: a first torque sensor tone wheel, a second torque sensor tone wheel, a first torque sensor, a second torque sensor, and a torque signal processor; wherein the first torque sensor and the second torque sensor are both magnetoelectric torque sensors; the first torque sensor tone wheel is fixedly disposed on a shaft head at a first end of the transmission shaft; the second torque sensor tone wheel is fixedly disposed on a shaft head at a second end of the transmission shaft; the transmission shaft drives the first torque sensor tone wheel and the second torque sensor tone wheel to rotate;

[0005] The first torque sensor tone wheel and the second torque sensor tone wheel are both provided with the same number of magnetic steel components spaced apart along the circumferential direction;

[0006] The collecting end of the first torque sensor faces the magnetic steel assembly on the first torque sensor sound wheel, and the first torque sensor is used to collect the first induced magnetic field generated by the magnetic steel assembly driven by the rotation of the first torque sensor sound wheel;

[0007] The collecting end of the second torque sensor faces the magnetic steel assembly on the second torque sensor sound wheel, and the second torque sensor is used to collect the second induced magnetic field generated by the magnetic steel assembly driven by the rotation of the second torque sensor sound wheel;

[0008] The torque signal processor determines a torque signal based on the first induced magnetic field, the second induced magnetic field and preset calculation parameters; wherein the preset calculation parameters include: tail drive shaft torque stiffness value, maximum torque value, rated torque value and torque angle.

[0009] In some preferred embodiments of the present invention, the first torque sensor tone wheel and the second torque sensor tone wheel each include: a mounting plate, a magnetic steel assembly and a screw;

[0010] The mounting plate is fixedly connected to the shaft head of the transmission shaft;

[0011] The magnetic steel assembly is evenly mounted on the mounting plate along the circumference of the mounting plate by screws; the magnetic steel assembly is used to provide an induced magnetic field.

[0012] In some preferred embodiments of the present invention, the first torque sensor and the second torque sensor each include: a sensor socket, a housing, a heat shrink tube, a nut, a shielding cover, and a coil assembly;

[0013] The sensor socket is connected to the torque signal processor via a communication wire;

[0014] The shell is wrapped around the outside of the heat shrink tubing, the shielding cover and the coil assembly;

[0015] The nut is arranged on the outer side of the shell;

[0016] The shield is used to isolate the coil assembly from the sensor socket;

[0017] The coil assembly is connected to the terminal of the sensor socket through wires, and heat shrink tubing is used to protect the wires and the terminal.

[0018] In some preferred embodiments of the present invention, the hardware circuit of the torque signal processor includes: a signal processing circuit, a channel detection circuit, a disconnection detection circuit, a microcontroller, a D / A conversion and output interface circuit, an RS422 interface circuit, and a calibration signal detection circuit;

[0019] The first torque sensor and the second torque sensor are both connected to one end of the signal processing circuit, and the other end of the signal processing circuit is connected to the microcontroller;

[0020] The D / A conversion and output interface circuit, the RS422 interface circuit, and the calibration signal detection circuit are all connected to the microcontroller;

[0021] Both ends of the channel detection circuit and the disconnection detection circuit are connected to the microcontroller and the signal processing circuit.

[0022] In some preferred embodiments of the present invention, the signal processing circuit includes: a first signal processing path, a second signal processing path, and a phase difference acquisition circuit;

[0023] The first signal processing path and the second signal processing path both include: an impedance matching circuit, a filtering and amplifying circuit, and a square wave conversion circuit connected in sequence;

[0024] The output end of the square wave conversion circuit is connected to the phase difference acquisition circuit and the microcontroller;

[0025] The output end of the phase difference acquisition circuit is connected to the microcontroller.

[0026] In some preferred embodiments of the present invention, the phase difference acquisition circuit includes: two square wave signal processing paths and an XOR comparator;

[0027] The square wave signal processing path includes: a plurality of resistors, a plurality of capacitors and two comparators connected in sequence;

[0028] The output ends of the two square wave signal processing paths are both connected to the input ends of the exclusive OR comparator;

[0029] The output terminal of the XOR comparator is connected to the microcontroller.

[0030] In some preferred embodiments of the present invention, the hardware circuit of the torque signal processor further includes: a power supply circuit;

[0031] The power supply circuit includes: a filter circuit, an energy storage circuit and a DC / DC module which are connected in sequence.

[0032] In some preferred embodiments of the present invention, the torque signal processor is solidified with torque signal processor software;

[0033] The torque signal processor software determines a torque signal based on the first induced magnetic field, the second induced magnetic field, and the calculated parameters.

[0034] In some preferred embodiments of the present invention, the torque signal is determined by the following formula:

[0035] ;

[0036] in, is the torque signal; is the torque stiffness value of the tail drive shaft; is the maximum torque; is the first torque angle; is the second torque angle; is the rated torque value.

[0037] In a second aspect, the present invention provides a transmission shaft torque detection system, comprising: an external user terminal, a ground adjustment device, and the transmission shaft torque detection device provided in the first aspect above.

[0038] The present invention brings the following beneficial effects:

[0039] The present invention provides a transmission shaft torque detection device and system, the device comprising: a first torque sensor tone wheel, a second torque sensor tone wheel, a first torque sensor, a second torque sensor and a torque signal processor; wherein the first torque sensor and the second torque sensor are both magnetoelectric torque sensors; the first torque sensor tone wheel is fixedly arranged on the shaft head at the first end of the transmission shaft; the second torque sensor tone wheel is fixedly arranged on the shaft head at the second end of the transmission shaft; the transmission shaft drives the first torque sensor tone wheel and the second torque sensor tone wheel to rotate; the first torque sensor tone wheel and the second torque sensor tone wheel are both provided with the same number of magnetic steel components spaced apart along the circumferential direction; the collection end of the first torque sensor faces the magnetic steel component on the first torque sensor tone wheel, The first torque sensor is used to collect the first induced magnetic field generated by the magnetic steel assembly driven by the rotation of the first torque sensor sound wheel; the collection end of the second torque sensor faces the magnetic steel assembly on the second torque sensor sound wheel, and the second torque sensor is used to collect the second induced magnetic field generated by the magnetic steel assembly driven by the rotation of the second torque sensor sound wheel; the torque signal processor determines the torque signal based on the first induced magnetic field, the second induced magnetic field and preset calculation parameters; wherein the preset calculation parameters include: the torque stiffness value of the tail drive shaft, the maximum torque, the rated torque value and the torque angle; by setting a magnetoelectric torque sensor and a matching induced magnetic field generating component and a signal processing component, the measurement accuracy of the drive shaft torque is greatly improved in a heavily polluted environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A schematic diagram of the working principle of a magnetoelectric sensor provided by an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of the installation of a transmission shaft torque detection device provided by an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the installation of a first torque sensor tone wheel and a first torque sensor provided by an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of the installation of a second torque sensor tone wheel and a second torque sensor provided by an embodiment of the present invention;

[0045] Figure 5A schematic diagram of a design of a transmission shaft torque detection device provided by an embodiment of the present invention is shown;

[0046] Figure 6 A schematic structural diagram of a torque sensor tone wheel provided by an embodiment of the present invention;

[0047] Figure 7 A schematic diagram of a torque sensor tone wheel provided by an embodiment of the present invention being installed on a drive shaft head;

[0048] Figure 8 A schematic structural diagram of a magnetoelectric torque sensor provided by an embodiment of the present invention;

[0049] Figure 9 A schematic diagram of the hardware circuit principle of a torque signal processor provided by an embodiment of the present invention;

[0050] Figure 10 A schematic diagram of the power supply circuit principle in the hardware circuit of a torque signal processor provided by an embodiment of the present invention;

[0051] Figure 11 A schematic diagram of a processing circuit principle for a torque sensor signal 1 in a hardware circuit of a torque signal processor provided by an embodiment of the present invention;

[0052] Figure 12 A schematic diagram of a processing circuit principle for a torque sensor signal 2 in a hardware circuit of a torque signal processor provided by an embodiment of the present invention;

[0053] Figure 13 A schematic diagram of a phase difference acquisition circuit provided by an embodiment of the present invention;

[0054] Figure 14 A schematic diagram of the functional principle of a torque signal processor software provided by an embodiment of the present invention;

[0055] Figure 15 A schematic diagram of the structure between a torque sensor and an elastic shaft provided by an embodiment of the present invention;

[0056] Figure 16 A schematic diagram of the output waveform of a torque sensor provided by an embodiment of the present invention.

[0057] Figure 17 A schematic diagram of the torsional angle displacement of a transmission shaft provided by an embodiment of the present invention.

[0058] Icon: 1-Sensor socket; 2-Housing; 3-Heat shrink tubing; 4-Nut; 5-Shielding cover; 6-Coil assembly; 10-Drive shaft; 20-First torque sensor tone wheel; 30-Second torque sensor tone wheel; 40-First torque sensor; 50-Second torque sensor; 60-Magnetic steel assembly; 70-Mounting plate. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0060] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0061] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0062] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0063] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0064] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0065] Currently, the torque of the transmission shaft 10 is measured using a photoelectric torque sensor. In many monitoring systems for the torque of the transmission shaft 10 , only the monitoring and measurement parts are used, and the measured values are sometimes not directly usable by users.

[0066] The photoelectric torque sensor calculates torque by measuring the torsional deformation of two sections of the engine's drive shaft 10, separated by a predetermined distance, under load. To achieve this, a special modulation disk is mounted on the drive shaft 10 to pulse-modulate an infrared beam. The sensor measures and calculates the angular displacement between the modulation disks caused by the applied force on the drive shaft 10 by measuring the changes in the parameters of the photoelectric pulses generated by the infrared light pulses. The resulting torque is then resolved.

[0067] During operation and maintenance, photoelectric torque sensors should be carefully protected from strong vibrations and impacts, such as drops and collisions. In particular, the sensor's light-transmitting window should be kept clean to prevent dust, oil, and foreign matter from obstructing the light beam. Obstruction of the light-transmitting window by foreign matter reduces its light transmittance, affecting the formation of photoelectric pulses and causing significant fluctuations in torque data. Photoelectric torque sensors are also susceptible to electromagnetic interference and difficult to install. High shaft speeds can lead to dynamic balance issues.

[0068] In order to solve this situation and problem, taking into account that both ends of the tail drive shaft 10 are lubricated with bearings, the torque sensor is in a more polluted environment, and the tail drive shaft 10 has a certain amount of runout during transmission, the torque sensor uses a magnetoelectric torque sensor that is easy to maintain and more stable.

[0069] Driven by user needs, the torque sensor's output speed signal was susceptible to interference, operating in polluted environments, experiencing large fluctuations in the signal received by the subsequent processing circuitry, requiring high measurement accuracy, and addressing the impact of signal amplitude on the measurement accuracy of the torque sensor and torque signal processor. With the existing structure and foundation, accurate torque measurement and subsequent processing of the tail drive shaft 10 were difficult in heavily polluted and interference-prone environments.

[0070] The torque detection device and system for the transmission shaft 10 provided by the present invention is an integrated technology that includes torque measurement by a magnetoelectric torque sensor, subsequent signal reprocessing, and maintenance.

[0071] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0072] Example 1

[0073] An embodiment of the present invention provides a transmission shaft torque detection device, comprising: a first torque sensor tone wheel 20, a second torque sensor tone wheel 30, a first torque sensor 40, a second torque sensor 50, and a torque signal processor; wherein the first torque sensor 40 and the second torque sensor 50 are both magnetoelectric torque sensors; the first torque sensor tone wheel 20 is fixedly disposed on the shaft head at the first end of the transmission shaft 10; the second torque sensor tone wheel 30 is fixedly disposed on the shaft head at the second end of the transmission shaft 10; the transmission shaft 10 drives the first torque sensor tone wheel 20 and the second torque sensor tone wheel 30 to rotate; the first torque sensor tone wheel 20 and the second torque sensor tone wheel 30 are both circumferentially spaced apart and have the same number of magnetic steel components. 60; the collecting end of the first torque sensor 40 faces the magnetic steel assembly 60 on the first torque sensor sound wheel 20, and the first torque sensor 40 is used to collect the first induced magnetic field generated by the magnetic steel assembly 60 driven by the rotation of the first torque sensor sound wheel 20; the collecting end of the second torque sensor 50 faces the magnetic steel assembly 60 on the second torque sensor sound wheel 30, and the second torque sensor 50 is used to collect the second induced magnetic field generated by the magnetic steel assembly 60 driven by the rotation of the second torque sensor sound wheel 30; the torque signal processor determines the torque signal based on the first induced magnetic field, the second induced magnetic field and preset calculation parameters; wherein the preset calculation parameters include: the torque stiffness value, the maximum torque, the rated torque value and the torque angle of the tail drive shaft 10.

[0074] For details, see Figure 1The schematic diagram shows the operating principle of a magnetoelectric sensor provided by an embodiment of the present invention. The basic principle of a magnetoelectric torque sensor is to convert the measured torque into two electrical signals with a phase difference through magnetoelectric conversion. The change in the phase difference between these two signals is proportional to the magnitude of the measured torque. The single detection portion of the magnetoelectric torque sensor primarily consists of a permanent magnet and a coil assembly, which works in conjunction with an inductor (a gear or grid type). When the inductor rotates, the gear teeth approach the pole shoe, reducing the magnetic resistance. When the gear teeth deviate from the pole shoe, the magnetic resistance increases. Consequently, the magnetic flux passing through the induction coil varies periodically with a period of T, generating an induced electromotive force (EMF) and outputting a sinusoidal voltage signal U. The frequency and amplitude of this induced electromotive force vary with the frequency of the inductor teeth passing through the pole shoe. Specifically, the higher the inductor speed, the higher the frequency of the inductor teeth passing through the pole shoe, i.e., the faster the magnetic flux changes, and the higher the voltage output by the speed magnetic sensor. Conversely, the lower the voltage output by the speed magnetic sensor.

[0075] For further information, see Figure 2 The embodiment of the present invention provides a schematic diagram of the installation of a transmission shaft torque detection device, Figure 3 The embodiment of the present invention provides a first torque sensor tone wheel and a first torque sensor installation diagram and Figure 4 The embodiment of the present invention provides a schematic diagram of the installation of a second torque sensor tone wheel and a second torque sensor. The torque sensor is installed at both ends of the front axle of the tail drive shaft 10; the torque sensor tone wheel is installed on the inner side of both ends of the front axle of the tail drive shaft 10; the installation position of the amplified first torque sensor 40 and the first torque sensor tone wheel 20 is as shown in FIG. Figure 3 The installation position of the second torque sensor 50 and the second torque sensor tone wheel 30 after the enlargement is as shown Figure 4 As shown; the torque signal processor is installed on the side wall panel inside the cabin.

[0076] For further information, see Figure 5 The schematic diagram of the design of a transmission shaft torque detection device provided by an embodiment of the present invention is shown. Two torque sensor sound wheels and two torque sensors are fixed. The torque sensors receive and output two sensor signals. The torque signal processor then collects and processes the two sensor signals. The signals are resolved and processed by the torque signal processor software, and calibration is required. Finally, they are converted into a DC voltage signal and output. The change in the voltage value reflects the change in the torque value of the tail transmission shaft 10.

[0077] Furthermore, in some preferred embodiments of the present invention, the first torque sensor tone wheel 20 and the second torque sensor tone wheel 30 both include: a mounting plate 70, a magnetic steel assembly 60 and screws; the mounting plate 70 is fixedly connected to the shaft head of the transmission shaft 10; the magnetic steel assembly 60 is evenly mounted on the mounting plate 70 along the circumference of the mounting plate 70 by screws; the magnetic steel assembly 60 is used to provide an induced magnetic field.

[0078] For details, see Figure 6 The structural diagram of a torque sensor tone wheel provided by an embodiment of the present invention is shown as follows Figure 7 The schematic diagram shows a torque sensor tone wheel installed on a drive shaft stub according to an embodiment of the present invention. The torque sensor tone wheel primarily comprises a mounting plate 70, a magnetic steel assembly 60, and screws. The mounting plate 70 is mounted on the stubs at both ends of the tail drive shaft 10, and the magnetic steel assembly 60 is evenly mounted on the mounting plate with screws to provide the induction magnetic field required by the torque sensor.

[0079] In order to obtain a better and more stable magnetic field and facilitate installation on a cylindrical shaft such as the drive shaft 10, the torque detection system of the drive shaft 10 provided in the embodiment of the present invention has a special-shaped structural design for the torque sensor tone wheel structure; in some preferred embodiments of the present invention, a through hole corresponding to the sensor mounting bolt is provided on the mounting plate 70 of the torque sensor tone wheel, and the mounting plate 70 of the torque sensor tone wheel is fixed to the sensor through the sensor mounting bolt. The torque sensor tone wheel is structurally designed by utilizing the installation space of the original bolt flat washer when the drive shaft 10 is installed in the user's transmission system, so that the tone wheel function can be realized without making any changes to the size and structure of the user's original transmission system, which is convenient for user use, and the magnetic steel is evenly distributed on the circumference of the tone wheel, and the tone wheel is installed on the tail drive shaft 10.

[0080] Furthermore, in some preferred embodiments of the present invention, the first torque sensor 40 and the second torque sensor 50 each include: a sensor socket 1, a housing 2, a heat shrink tube 3, a nut 4, a shielding cover 5, and a coil assembly 6; the sensor socket 1 is connected to the torque signal processor via a communication wire; the housing 2 is wrapped around the outside of the heat shrink tube 3, the shielding cover 5, and the coil assembly 6; the nut 4 is disposed on the outside of the housing 2; the shielding cover 5 is used to isolate the coil assembly 6 from the sensor socket 1; the coil assembly 6 is connected to the terminal of the sensor socket 1 via a wire, and the heat shrink tube 3 is used to protect the wire and the terminal. For details, see Figure 8 The figure shows a schematic structural diagram of a magnetoelectric torque sensor provided by an embodiment of the present invention.

[0081] Reasonable setting of the installation positions of the two torque sensors can achieve matching of the installation positions of the two torque sensors, greatly reducing the influence of the signal amplitude on the measurement results.

[0082] Furthermore, in some preferred embodiments of the present invention, the hardware circuit of the torque signal processor includes: a signal processing circuit, a channel detection circuit, a disconnection detection circuit, a microcontroller, a D / A conversion and output interface circuit, an RS422 interface circuit, and a calibration signal detection circuit; the first torque sensor 40 and the second torque sensor 50 are both connected to one end of the signal processing circuit, and the other end of the signal processing circuit is connected to the microcontroller; the D / A conversion and output interface circuit, the RS422 interface circuit, and the calibration signal detection circuit are all connected to the microcontroller; both ends of the channel detection circuit and both ends of the disconnection detection circuit are connected to the microcontroller and the signal processing circuit.

[0083] Furthermore, in some preferred embodiments of the present invention, the signal processing circuit includes: a first signal processing path, a second signal processing path and a phase difference acquisition circuit; the first signal processing path and the second signal processing path both include: an impedance matching circuit, a filtering and amplifying circuit and a square wave conversion circuit connected in sequence; the output end of the square wave conversion circuit is connected to the phase difference acquisition circuit and the microcontroller; the output end of the phase difference acquisition circuit is connected to the microcontroller.

[0084] Furthermore, in some preferred embodiments of the present invention, the phase difference acquisition circuit includes: two square wave signal processing paths and an XOR comparator; the square wave signal processing path includes: multiple resistors, multiple capacitors and two comparators connected in sequence; the output ends of the two square wave signal processing paths are both connected to the input ends of the XOR comparator; and the output end of the XOR comparator is connected to the microcontroller.

[0085] Furthermore, in some preferred embodiments of the present invention, the hardware circuit of the torque signal processor further includes: a power supply circuit;

[0086] The power supply circuit includes a filter circuit, a tank circuit, and a DC / DC module connected in sequence. In some preferred embodiments of the present invention, the torque signal processor includes torque signal processor software; the torque signal processor software determines the torque signal based on the first induced magnetic field, the second induced magnetic field, and the calculated parameters.

[0087] Specifically, the torque signal processor consists of a socket, a conductive square rubber pad, a cover, a box body, a signal processing component, a power component, a wiring piece, a heat shrink tube, an ultra-micro rectangular plug, a grounding wire and a grounding column. Figure 9 The hardware circuit principle diagram of a torque signal processor provided by an embodiment of the present invention is shown in FIG. Figure 10 The schematic diagram of the power supply circuit in the hardware circuit of a torque signal processor provided by an embodiment of the present invention is shown. Figure 11 The schematic diagram of the processing circuit principle of the torque sensor signal 1 in the hardware circuit of the torque signal processor provided by the embodiment of the present invention is shown, Figure 12The schematic diagram of the processing circuit principle of the torque sensor signal 2 in the hardware circuit of the torque signal processor provided by the embodiment of the present invention is shown and Figure 13 The embodiment of the present invention shown in the schematic diagram of a phase difference acquisition circuit provides a torque signal processor hardware circuit including: a signal processing circuit, a disconnection detection circuit, a microcontroller, a D / A conversion and output interface circuit, an RS422 interface circuit, a power supply circuit, etc.

[0088] The signal processing circuit consists of an impedance matching circuit, a filtering and amplifying circuit, a square wave conversion circuit, and a phase difference acquisition circuit. The torque sensor outputs a frequency signal proportional to the rotational speed, with signal characteristics similar to a sinusoidal signal. The torque signal processor transmits the signals from the first torque sensor 40 and the second torque sensor 50 through the impedance matching circuit to the filtering and amplifying circuit, where noise is filtered out before amplification. After passing through the impedance matching circuit and filtering and amplifying circuit, a significant portion of the signal interference is filtered out. The amplified signal is then converted into a square wave using a square wave conversion circuit. The phase difference acquisition circuit converts the phase difference between the two square wave signals into a rectangular pulse (i.e., an XOR signal).

[0089] The microcontroller captures and counts these rectangular pulses (i.e., one XOR signal) and converts them into corresponding torque values. After D / A conversion and the output interface circuit, it drives the DA output chip to output a DC voltage signal proportional to the torque value. Upon power-up, the disconnection detection circuit and channel detection circuit check the connection status (connected or disconnected) between the torque signal processor and the torque sensor, as well as the functioning of the signal conditioning channel (filtering circuit, amplification circuit, and shaping circuit). The RS422 interface circuit is used for communication and is calibrated during the initialization of the entire system.

[0090] After the two torque sensor signals (IN1+ and IN2+) pass through an active second-order low-pass filter circuit, they are converted into two square wave signals (sign1 and sign2) using a comparison circuit. The phase difference between the two square wave signals is converted into corresponding levels through an exclusive-OR gate.

[0091] For further information, see Figure 14The functional principle diagram of a torque signal processor software provided by an embodiment of the present invention is shown. The torque signal processor software is solidified on the torque signal processor. First, the system is initialized; then, the three signals introduced by the interrupt I / O port of the microcontroller on the hardware are captured and measured, and the filtering processing functions of each channel are used in combination with bubbling, median averaging method, recursive averaging filtering method, and limiting filtering to obtain a stably changing signal. Then, the frequency calculation function obtains two frequency signal values and one pulse width signal (exclusive OR signal). At the same time, the level is judged through the high and low level judgment port of one I / O port, and the torque angle calculation formula to be selected is judged through the formula judgment function. Then, the torque angle calculation function The torque angle value (in degrees at this time) is calculated; in addition, when the frequency signal is a fixed value (this is the initial state of the entire system), calibration data is received through RS422 communication; when the calibration is successful, the data to be calibrated is sent through RS422 communication, and the data of the received array is stored and read (including the torque rating, the torque stiffness value of the tail drive shaft 10 (the K value mentioned above), and the initial value of the torque in the initial state), and the read data participates in the voltage calculation; then, according to the corresponding relationship between the torque angle value and the voltage, the voltage calculation function is used to calculate the theoretical voltage to be output, and the voltage chip drive output function is used to drive each pin of the voltage chip to output a DC voltage signal.

[0092] Furthermore, in some preferred embodiments of the present invention, the torque signal is determined by the following formula: ;in, is the torque signal; is the torque stiffness value of the tail transmission shaft 10; Maximum torque; a first torque angle; is the second torque angle; is the rated torque value.

[0093] For details, see Figure 15 The schematic diagram of the structure between a torque sensor and an elastic shaft provided by an embodiment of the present invention is shown. Figure 16 The figure shows a schematic diagram of an output waveform of a torque sensor provided by an embodiment of the present invention.

[0094] Two gears are mounted at either end of the elastic shaft, with a magnetoelectric sensor located above each gear. As the elastic shaft rotates, the change in the permeability of the air gap between the magnet and the gear induces two potentials in the signal coil. When the applied torque is zero, these two potentials have a constant initial phase difference, which depends solely on the relative position of the two gears on the shaft.

[0095] When an external torque is applied, the elastic shaft undergoes torsional deformation. Within the elastic deformation range, its torsional angle is proportional to the applied torque. As the torsional angle changes, the phase difference between the two potentials also changes accordingly. The absolute value of this phase difference change is proportional to the magnitude of the applied torque.

[0096] Since the frequency of the potential is proportional to the product of the speed and the number of teeth, where the number of teeth is a fixed value, the frequency of the potential is proportional to the speed. In the time domain, the induced signal is a sinusoidal signal. The time history of each alternating cycle varies with the speed, and the phase difference between them is measured. , you can get the torque value.

[0097] See also Figure 17 The embodiment of the present invention provides a schematic diagram of a transmission shaft torsion angle displacement, the torsion angle Phase difference with induced potential The relationship is:

[0098] ;

[0099] Where, is the number of teeth on the sensor gear.

[0100] From the mechanics of materials we know that:

[0101] ;

[0102] in, is the torsion angle of the elastic axis; is the torque; is the shear modulus; is the diameter of the elastic shaft; l is the working length of the elastic shaft.

[0103] Among them, l, d, and G are all constants. Let , then:

[0104] ;

[0105] In addition, the elastic shaft used to measure torque needs to physically amplify the torsion angle, so the elastic shaft is long, and the normal working environment temperature is high, and the material The shear modulus will change with temperature. Therefore, it is necessary to consider the effect of temperature on measurement accuracy and take the temperature coefficient into account when calculating torque. , then:

[0106] ;

[0107] When the shaft is subjected to torque, a relative torsion angle will be generated between any two sections with a distance of l along the axial direction. ,See Figure 16 , whose values are:

[0108] ;

[0109] Where, is the shear elastic modulus, is the polar moment of inertia of the shaft section. When the shaft is a solid circular section;

[0110] ;

[0111] When the shaft body is annular in cross section (outer diameter , inner diameter )hour;

[0112] ;

[0113] Torque stiffness of tail drive shaft 10 and torque values The relationship is:

[0114] ;

[0115] ;

[0116] in, is the torque value; is the torque stiffness value of the tail drive shaft; is the torque angle; is the rated torque value; is the torque difference; is the maximum torque; is the converted voltage value, which is the torque signal.

[0117] After calculation and the proportional relationship with the voltage, the voltage calculation formula output by the torque monitoring system of the tail drive shaft 10 is finally as follows:

[0118] ;

[0119] Furthermore, the acquisition of two frequency signal values and one pulse width signal (XOR signal) is achieved by changing the input signal capture trigger mode (Phase 1: After the rising edge trigger is changed to the falling edge trigger, the high level holding time is measured during the period ; Phase 2: After falling edge trigger, change to rising edge trigger, during which the high level holding time is measured . Measured input signal period ), the phase difference is measured , the input signal frequency is measured according to the frequency capture interface , thus obtaining the period of the input signal (Right now and with the input signal cycle Compare them, and when the two are close, the measured data is considered valid), and the torque angle value is obtained Number of teeth.

[0120] The device provided by the present invention comprises two torque sensor phono wheels, two torque sensors, a torque signal processor, and torque signal processor software embedded within the torque signal processor. The torque sensor phono wheels primarily generate an alternating magnetic field when the tail drive shaft 10 rotates. Torque sensors mounted at both ends of the tail drive shaft 10 then collect signals. The torque signal processor and its software then process these signals, converting them into a DC voltage signal for output. This device is used to monitor the torque load on the tail drive shaft 10 during operation.

[0121] The key point of this embodiment of the present invention is that it integrates torque detection into a complete set of devices, implementing a systematic and interconnected design. Furthermore, new torque sensor structural designs, new torque sensor tone wheel structural designs, new torque signal processor hardware designs, new torque signal processor software designs, and data processing algorithm designs were also implemented. By optimizing the magnetic steel and structural design of the torque sensor tone wheel and torque sensor, the problems of the output speed signal being susceptible to interference and the high environmental pollution caused by its use were fundamentally addressed. By designing the torque signal processor hardware and software, as well as implementing algorithmic compensation, the problem of signal amplitude affecting measurement accuracy was resolved. This fulfills the system requirements for torque measurement.

[0122] The embodiment of the present invention solves the problem of difficulty in measuring the torque value of the tail drive shaft 10 by measuring the phase difference and the tone-wheel ratio between the two torque sensor signals, and processing and solving the phase difference and the tone-wheel ratio through a torque signal processor and torque signal processor software to output a DC signal. At the same time, various functions are integrated. Using this system, a voltage value that has a certain corresponding relationship with the torque can be directly obtained, which makes it more convenient to evaluate the load-bearing capacity and durability of the tail drive shaft 10 during operation.

[0123] The torque sensor provided in the embodiment of the present invention is of magnetoelectric type, and is used to collect the torque load of the tail drive shaft 10 when it is working. It has strong pollution resistance, simple maintenance, and no component failure problem.

[0124] The embodiment of the present invention ensures that the installation distance between the torque sensor and the torque sensor tone wheel is about 15 mm through the special structural design of the torque sensor tone wheel. Compared with the torque sensor in the prior art, the magnet is designed inside the torque sensor. In this design, the magnetic flux passing through the coil is determined by the magnet and remains unchanged. The change in magnetic flux caused by the tone wheel only causes the external leakage magnetic flux to change periodically, and the change in magnetic flux of the leakage magnetic flux is not obvious. Therefore, the torque sensor can only be placed close to the tone wheel, and the usual detection distance is about 1 mm. In the transmission shaft torque detection device provided by the embodiment of the present invention, the magnet is installed on the tone wheel, which can make the magnetic flux passing through the torque sensor change from 0 to the maximum, maximize the rate of change of the magnetic flux, and improve the detection of the torque sensor, specifically increasing the detection to 15 mm. The installation distance is adjustable to ensure that there is no possibility of collision during the rotation of the tail shaft, solving the problems of inconvenient installation and easy bumping during use.

[0125] The torque signal processor provided in this embodiment receives analog data from a torque sensor, converts, filters, and amplifies the data, and finally converts the data into a voltage output that corresponds to the torque. The hardware circuitry includes optimized frequency signal conditioning, phase difference acquisition, and filtering, significantly reducing signal interference.

[0126] The torque signal processor software provided in the embodiment of the present invention is responsible for the control and data processing of the entire system, completing tasks such as signal acquisition, calculation, conversion, voltage output, and communication with the host computer. Through the processing of filtering and compensation algorithms, the data is corrected, greatly reducing the impact of interference data.

[0127] The present invention provides a transmission shaft torque detection device, which includes: a first torque sensor tone wheel 20, a second torque sensor tone wheel 30, a first torque sensor 40, a second torque sensor 50 and a torque signal processor; wherein the first torque sensor 40 and the second torque sensor 50 are both magnetoelectric torque sensors; the first torque sensor tone wheel 20 is fixedly arranged on the shaft head of the first end of the transmission shaft 10; the second torque sensor tone wheel 30 is fixedly arranged on the shaft head of the second end of the transmission shaft 10; the transmission shaft 10 drives the first torque sensor tone wheel 20 and the second torque sensor tone wheel 30 to rotate; the first torque sensor tone wheel 20 and the second torque sensor tone wheel 30 are both circumferentially spaced apart with the same number of magnetic steel components 60; the collection end of the first torque sensor 40 faces the shaft head of the first torque sensor tone wheel 20 The magnetic steel assembly 60 and the first torque sensor 40 are used to collect the first induced magnetic field generated by the magnetic steel assembly 60 driven by the rotation of the first torque sensor sound wheel 20; the collecting end of the second torque sensor 50 faces the magnetic steel assembly 60 on the second torque sensor sound wheel 30, and the second torque sensor 50 is used to collect the second induced magnetic field generated by the magnetic steel assembly 60 driven by the rotation of the second torque sensor sound wheel 30; the torque signal processor determines the torque signal based on the first induced magnetic field, the second induced magnetic field and the preset calculation parameters; wherein the preset calculation parameters include: the torque stiffness value, the maximum torque, the rated torque value and the torque angle of the tail drive shaft 10; by setting a magnetoelectric torque sensor and a matching induced magnetic field generating component and a signal processing component, the measurement accuracy of the torque of the drive shaft 10 is greatly improved in a heavily polluted environment.

[0128] Example 2

[0129] Based on the above embodiment, an embodiment of the present invention provides a transmission shaft torque detection system, comprising: an external user terminal, a ground adjustment device, and the transmission shaft torque detection device provided in the above embodiment.

[0130] Specifically, the adjustment work is carried out in accordance with the provisions of the communication protocol, and the initial position where the tail drive shaft 10 is deformed is considered to be the initial state. The calibration work is performed in this state. The adjustment work is only performed when the torque sensor and the torque sensor tone wheel are initially installed or their installation positions are adjusted. It is no longer performed during subsequent use.

[0131] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the transmission shaft torque detection system described above can refer to the corresponding process in the aforementioned embodiment of the transmission shaft torque detection device, and will not be repeated here.

[0132] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0133] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0134] If the functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transmission shaft torque detection device, characterized in that: include: A first torque sensor tone wheel, a second torque sensor tone wheel, a first torque sensor, a second torque sensor, and a torque signal processor; wherein the first torque sensor and the second torque sensor are both magnetoelectric torque sensors; the first torque sensor tone wheel is fixedly disposed on the shaft head at the first end of the transmission shaft; the second torque sensor tone wheel is fixedly disposed on the shaft head at the second end of the transmission shaft; the transmission shaft drives the first torque sensor tone wheel and the second torque sensor tone wheel to rotate; The first torque sensor sound wheel and the second torque sensor sound wheel are both provided with the same number of magnetic steel components spaced apart along the circumferential direction; The collecting end of the first torque sensor faces the magnetic steel assembly on the first torque sensor sound wheel, and the first torque sensor is used to collect the first induced magnetic field generated by the magnetic steel assembly driven by the rotation of the first torque sensor sound wheel; The collecting end of the second torque sensor faces the magnetic steel assembly on the second torque sensor sound wheel, and the second torque sensor is used to collect the second induced magnetic field generated by the magnetic steel assembly driven by the rotation of the second torque sensor sound wheel; The torque signal processor determines a torque signal based on the first induced magnetic field, the second induced magnetic field, and preset calculation parameters; wherein the preset calculation parameters include: a tail drive shaft torque stiffness value, a maximum torque value, a rated torque value, and a torque angle; The torque signal is determined by the following formula: Among them, U is the torque signal; K is the torque stiffness value of the tail drive shaft; T max is the maximum torque value; φ1 is the first torque angle; φ0 is the second torque angle; T0 is the rated torque value.

2. The transmission shaft torque detection device according to claim 1, characterized in that: The torque sensor tone wheel and the second torque sensor tone wheel both include: a mounting plate, a magnetic steel assembly and screws; The mounting plate is fixedly connected to the shaft head of the transmission shaft; The magnetic steel assembly is evenly mounted on the mounting plate along the circumference of the mounting plate by means of the screws; the magnetic steel assembly is used to provide an induced magnetic field.

3. The transmission shaft torque detection device according to claim 1, characterized in that: The first torque sensor and the second torque sensor each include: a sensor socket, a housing, a heat shrink tube, a nut, a shielding cover, and a coil assembly; The sensor socket is connected to the torque signal processor via a communication wire; The shell is wrapped around the outside of the heat shrink tube, the shielding cover and the coil assembly; The nut is arranged on the outside of the shell; The shielding cover is used to isolate the coil assembly from the sensor socket; The coil assembly is connected to the terminal of the sensor socket via a wire, and the heat shrink tube is used to protect the wire and the terminal.

4. The transmission shaft torque detection device according to claim 1, characterized in that: The hardware circuit of the torque signal processor includes: a signal processing circuit, a channel detection circuit, a disconnection detection circuit, a microcontroller, a D / A conversion and output interface circuit, an RS422 interface circuit, and a calibration signal detection circuit; The first torque sensor and the second torque sensor are both connected to one end of the signal processing circuit, and the other end of the signal processing circuit is connected to the microcontroller; The D / A conversion and output interface circuit, RS422 interface circuit, and calibration signal detection circuit are all connected to the microcontroller; Both ends of the channel detection circuit and both ends of the disconnection detection circuit are connected to the microcontroller and the signal processing circuit.

5. The transmission shaft torque detection device according to claim 4, characterized in that: The signal processing circuit includes: a first signal processing path, a second signal processing path and a phase difference acquisition circuit; The first signal processing path and the second signal processing path both include: an impedance matching circuit, a filtering and amplifying circuit, and a square wave conversion circuit connected in sequence; The output end of the square wave conversion circuit is connected to the phase difference acquisition circuit and the microcontroller; The output end of the phase difference acquisition circuit is connected to the microcontroller.

6. The transmission shaft torque detection device according to claim 5, characterized in that: The phase difference acquisition circuit includes: two square wave signal processing paths and an XOR comparator; The square wave signal processing path includes: a plurality of resistors, a plurality of capacitors and two comparators connected in sequence; The output ends of the two square wave signal processing paths are both connected to the input end of the XOR comparator; The output end of the XOR comparator is connected to the microcontroller.

7. The transmission shaft torque detection device according to claim 4, characterized in that: The hardware circuit of the torque signal processor further includes: a power supply circuit; The power supply circuit includes: a filter circuit, an energy storage circuit and a DC / DC module which are connected in sequence.

8. The transmission shaft torque detection device according to claim 1, characterized in that: The torque signal processor software is solidified on the torque signal processor; The torque signal processor software determines a torque signal based on the first induced magnetic field, the second induced magnetic field, and the calculated parameters.

9. A transmission shaft torque detection system, characterized in that: include: An external user terminal, a ground adjustment device and a transmission shaft torque detection device as described in any one of claims 1-8.

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