Engine torque testing method, device, equipment, medium and product

Abstract

The invention discloses an engine torque testing method, device and equipment, a medium and a product, and relates to the technical field of engine real-time torque testing, and the method comprises the steps: obtaining the output voltage of a strain bridge disposed on a dual-mass flywheel at the current moment; the dual-mass flywheel is connected with the engine; obtaining the torque of the engine at the current moment according to the output voltage of the strain bridge at the current moment and the calibration curve; the calibration curve determination process comprises the steps that torque is applied to the dual-mass flywheel in real time in a historical time period, and output voltages of the strain bridge at all moments in the historical time period are collected; obtaining a calibration curve according to the torque applied to the dual-mass flywheel in the historical time period and the output voltage of the strain bridge at each moment; the abscissa of the calibration curve is the output voltage of the strain bridge, and the ordinate of the calibration curve is the torque applied to the dual mass flywheel.

Description

Technical Field

[0001] The present application relates to the technical field of engine real-time torque testing, and in particular to an engine torque testing method, device, equipment, medium and product. Background Art

[0002] The engine output effective torque (engine torque for short), its steady-state value is a key parameter that characterizes the engine's external characteristics, universal characteristics, internal resistance characteristics, etc. The analysis of the vehicle's energy flow, especially the disassembly of the chassis' wide temperature range resistance and the construction of a dynamic model, as well as the calibration of the power transmission strategy involved in driving quality improvement, requires reliance on the transient characteristics of the engine torque. Generally, the engine steady-state torque obtained based on bench calibration is output through the ECU CAN, which is difficult to meet the needs of energy testing and calibration under complex working conditions such as wide temperature range environments, cold starts, and gear shifting.

[0003] For engine torque estimation, related technologies have proposed model methods, such as: engine model based on BP neural network, and verified its effectiveness through test samples. Based on the linear relationship between injection speed ratio and engine torque, a piecewise linear torque model under different engine loads is established. The test verifies that the torque reconstruction result has a torque deviation of 8.67% from MAP calculation, but a torque deviation of 24.81% from CAN bus acquisition. The model methods proposed by related technologies have shortcomings such as poor real-time performance and inaccurate measurement results. Summary of the invention

[0004] The purpose of this application is to provide an engine torque testing method, device, equipment, medium and product, which can accurately measure the engine torque in a timely manner.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides an engine torque testing method, comprising:

[0007] Obtaining the output voltage of the strain bridge at the current moment; the strain bridge is arranged on the primary mass of the dual-mass flywheel; the dual-mass flywheel is connected to the engine;

[0008] The torque of the engine at the current moment is obtained according to the output voltage of the strain bridge at the current moment and the calibration curve;

[0009] The determination process of the calibration curve is:

[0010] Apply torque to the dual-mass flywheel in real time during the historical time period, and collect the output voltage of the strain bridge at each moment during the historical time period;

[0011] A calibration curve is obtained according to the torque applied to the dual mass flywheel in a historical time period and the output voltage of the strain bridge at each moment in the historical time period; the abscissa of the calibration curve is the output voltage of the strain bridge, and the ordinate of the calibration curve is the torque applied to the dual mass flywheel.

[0012] Optionally, obtaining the torque of the engine at the current moment according to the output voltage of the strain bridge at the current moment and the calibration curve specifically includes:

[0013] Determine the calibration equation according to the calibration curve;

[0014] The output voltage of the strain bridge at the current moment is input into the calibration equation to obtain the torque of the engine at the current moment.

[0015] In a second aspect, the present application provides an engine torque testing device, characterized in that the engine torque testing device comprises:

[0016] A dual-mass flywheel, a strain bridge, a strain unit and a host computer; the dual-mass flywheel is connected to the engine, the strain bridge is arranged on the primary mass of the dual-mass flywheel, the strain unit is connected to the strain bridge, the strain unit is used to collect the output voltage of the strain bridge, and send the collected output voltage of the strain bridge to the host computer, and the host computer is used to implement the above-mentioned engine torque test method.

[0017] Optionally, the engine torque testing device further includes: a wireless power supply module, wherein the wireless power supply module is used to supply power to the strain unit, and the strain unit is also used to supply power to the strain bridge.

[0018] Optionally, the engine torque testing device further includes: a data acquisition assembly, and the strain unit is used to send the acquired output voltage of the strain bridge to a host computer through the data acquisition assembly.

[0019] Optionally, the engine torque testing device further comprises: a wireless transmission module, and the strain unit transmits the collected output voltage of the strain bridge to the data acquisition assembly through the wireless transmission module.

[0020] Optionally, the wireless power supply module includes: a stator exciter, a stator coil and a rotor coil connected in sequence, the stator exciter is used to supply power to the stator coil so that the stator coil generates a magnetic field, the rotor coil is used to cut the magnetic field generated by the stator coil, and the rotor coil is connected to the strain unit for supplying power to the strain unit.

[0021] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any of the above-described engine torque testing methods.

[0022] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-mentioned engine torque testing methods.

[0023] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned engine torque testing methods.

[0024] According to the specific embodiments provided in this application, this application has the following technical effects:

[0025] The present application provides an engine torque testing method, device, equipment, medium and product. The model-based method proposed in the related art requires the acquired data to be input into the model. The processing time of the model is long, resulting in the inability to output the obtained torque result in time, and the real-time performance is poor. The present application can obtain the torque based on the output voltage of the strain bridge and the calibration curve. Compared with the model method, the processing time is short, the engine torque can be measured in time, and the real-time performance is strong. The vehicle engine may accelerate, brake, and idle due to the driver's driving habits. The model method proposed in the related technology does not discuss these situations, resulting in poor adaptability of the model method to complex working conditions and inaccurate measurement results. The strain bridge of the present application is arranged on the primary mass of the dual-mass flywheel, and the torque of the engine will be applied to the dual-mass flywheel. When the torque is applied to the dual-mass flywheel, the primary mass will undergo different deformations according to the magnitude of the torque, and the stress on the strain bridge will change with the magnitude of the deformation of the primary mass. The output voltage of the strain bridge changes according to the strain received, which essentially measures the torque based on the strain. Because the strain bridge has the characteristics of high precision, high sensitivity, and good linearity, it can accurately sense the stress changes caused by the tiny deformation of the primary mass due to different torques under complex working conditions, and can accurately convert it into changes in the output voltage. Therefore, the present application has strong adaptability to complex working conditions and can improve the accuracy of the torque measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of a flow chart of an engine torque testing method provided in one embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of an engine torque testing device provided in one embodiment of the present application;

[0029] Figure 3 It is the circuit diagram of strain bridge;

[0030] Figure 4 It is the parameter curve diagram of bench test process;

[0031] Figure 5 It is the CAN torque deviation curve diagram;

[0032] Figure 6 A primary quality structure diagram provided for an embodiment of the present application;

[0033] Figure 7 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] In an exemplary embodiment, Figure 1 As shown, a method for testing engine torque is provided, comprising:

[0037] Step 201: Obtain the output voltage of the strain bridge at the current moment; the strain bridge is set on the primary mass of the dual-mass flywheel; the dual-mass flywheel is connected to the engine. The torque of the engine will be applied to the dual-mass flywheel.

[0038] Step 202: The torque of the engine at the current moment is obtained according to the output voltage of the strain bridge at the current moment and the calibration curve. The calibration curve is determined by applying torque to the dual-mass flywheel in real time during the historical time period, and collecting the output voltage of the strain bridge at each moment during the historical time period. The calibration curve is obtained according to the torque applied to the dual-mass flywheel during the historical time period and the output voltage of the strain bridge at each moment during the historical time period; the abscissa of the calibration curve is the output voltage of the strain bridge, and the ordinate of the calibration curve is the torque applied to the dual-mass flywheel.

[0039] The implementation of the above steps 201 and 202 can accurately measure the engine torque in a timely manner.

[0040] In another exemplary embodiment of the present application, obtaining the torque of the engine at the current moment according to the output voltage of the strain bridge at the current moment and the calibration curve specifically includes:

[0041] Determine the calibration equation based on the calibration curve.

[0042] The output voltage of the strain bridge at the current moment is input into the calibration equation to obtain the torque of the engine at the current moment.

[0043] Based on the same inventive concept, the embodiment of the present application also provides an engine torque test device for implementing the engine torque test method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more engine torque test device embodiments provided below can refer to the limitations of the engine torque test method above, and will not be repeated here.

[0044] In an exemplary embodiment, an engine torque testing device is provided, such as Figure 2 As shown, the engine torque testing device comprises:

[0045] A dual-mass flywheel, a strain bridge, a strain unit and a host computer; the dual-mass flywheel is connected to the engine, the strain bridge is arranged on the primary mass of the dual-mass flywheel, and is used to sense the tensile strain or compressive strain on the surface of the primary mass, the strain unit is connected to the strain bridge, the strain unit is used to collect the output voltage of the strain bridge, and send the collected output voltage of the strain bridge to the host computer, and the host computer is used to implement the engine torque test method of the above embodiment.

[0046] In practical applications, the strain unit is also used to amplify and modulate the collected output voltage of the strain bridge.

[0047] In another exemplary embodiment of the present application, the engine torque testing device further includes: a wireless power supply module, wherein the wireless power supply module is used to supply power to the strain unit, and the strain unit is also used to supply power to the strain bridge.

[0048] In another exemplary embodiment of the present application, the wireless power supply module includes: a stator exciter, a stator coil and a rotor coil connected in sequence, the stator exciter is used to power the stator coil so that the stator coil generates a magnetic field (the stator exciter is powered to generate an alternating magnetic field with the same voltage frequency as the stator exciter output, and the amplitude and frequency of the stator exciter output voltage are affected by adjusting the resonant capacitor inside the stator exciter), the rotor coil is used to cut the magnetic field generated by the stator coil, and the rotor coil is connected to the strain unit to power the strain unit (specifically to provide a stable arch bridge voltage).

[0049] In practical applications, the rotor coil includes: a rotor coil body and enameled wire, the enameled wire is wound around the rotor coil body, a shell of epoxy resin plate material is arranged outside the rotor coil, and a shielding layer of 1J50 nickel-iron magnetic alloy material is arranged between the shell and the rotor coil to enhance the magnetic field effect. The rotor coil is installed on the primary mass surface of the dual-mass flywheel by arranging a metal sleeve and fasteners, and is concentric with the stator coil. The high-speed rotation does not interfere with the surrounding structure, and the high-speed rotation of the rotor coil cuts the alternating magnetic field to generate an induced electromotive force.

[0050] In practical applications, the stator coil includes: a stator coil body and enameled wire, the enameled wire is wound around the stator coil body, both ends of the enameled wire are connected to the stator exciter, an epoxy resin plate material shell is arranged outside the stator coil, and the shell is installed on the end face of the engine crankshaft by a special connector made of aluminum alloy, which is concentric with the rotor coil and does not interfere with the surrounding structure.

[0051] In another exemplary embodiment of the present application, the engine torque testing device also includes: an AD / DC unit, the rotor coil is connected to the strain unit through the AD / DC unit, and the AD / DC unit rectifies the induced electromotive force generated by the rotor coil, stabilizes the voltage and outputs stable direct current to power the strain unit.

[0052] In another exemplary embodiment of the present application, the engine torque testing device further includes: a data acquisition assembly, and the strain unit is used to send the acquired output voltage of the strain bridge to a host computer through the data acquisition assembly.

[0053] In another exemplary embodiment of the present application, the engine torque test device further includes: a wireless transmission module, through which the strain unit transmits the collected output voltage of the strain bridge to the data acquisition assembly. The wireless transmission module is an antenna, which is wound around the rotor coil body of the rotor coil.

[0054] In another exemplary embodiment of the present application, the data acquisition assembly includes a wireless receiver, an AD unit and a CAN recorder; the strain unit sends the collected output voltage of the strain bridge to the wireless receiver through the wireless transmission module, and the wireless receiver is used to convert the received output voltage of the strain bridge into an analog signal and output it. The AD unit is connected to the wireless receiver and is used to convert the analog signal output by the wireless receiver into a CAN signal and send it to the CAN recorder for storage. The CAN recorder is connected to the host computer via UDB and sends the internally stored data to the host computer.

[0055] In another exemplary embodiment of the present application, the wireless receiver and the CAN recorder are powered by a battery, the CAN recorder also powers the AD unit, and the wireless receiver also powers the stator exciter. The host computer is also used to configure the data acquisition assembly.

[0056] In another exemplary embodiment of the present application, the engine torque testing device further includes: a calibration device, the calibration device is connected to the CAN recorder via an AD unit, and a torque of known magnitude is applied to the dual-mass flywheel via the calibration device.

[0057] The process of obtaining the calibration curve is as follows: the calibration device applies a known torque to the dual-mass flywheel in real time during the historical time period, and sends the applied torque to the CAN recorder for storage through the AD unit. The strain unit collects the output voltage of the strain bridge at each moment in the historical time period in real time, and sends the collected voltage to the wireless receiver. The wireless receiver is used to convert the received output voltage of the strain bridge into an analog signal and send it to the CAN recorder for storage through the AD unit. The CAN recorder is connected to the host computer via USB, and the internally stored data is sent to the host computer. The host computer fits the relationship between the applied torque value and the output voltage according to the data stored in the CAN recorder to obtain the calibration curve, and then obtains the calibration equation: T D =kU D , where T D It represents the torque value applied by the calibration device to the dual-mass flywheel, N·m, k represents the fitting coefficient, U D Represents the output voltage of the strain gauge bridge, mV.

[0058] In another exemplary embodiment of the present application, the primary mass in the dual-mass flywheel is formed by modifying the primary mass in a certain flywheel, such as Figure 6 As shown, considering the factors of safe use, reliable structure, component installation, accurate torque measurement, etc. of the dual-mass flywheel, the function of the dual-mass flywheel is not affected and the overall dynamic balance is not destroyed. In the embodiment of the present application, the circular holes of the bowl-shaped plugs are symmetrically arranged on the surface of the primary mass to form four arched grooves 1, and two symmetrical arched grooves 1 are provided with four first M3 threaded holes 2, and the strain unit and the AC / DC unit are fixed in the arched grooves using M3 bolts matching the first M3 threaded holes 2. The strain unit and the AC / DC unit are symmetrically arranged, and eight second M3 threaded holes 3 are symmetrically provided near the center of the circle, and the rotor coil is fixed using M3 bolts matching the second M3 threaded holes 3; at the same time, there are structural beams between the adjacent four arched grooves, and the center lines of the four structural beams are 90°, which can effectively concentrate the surface strain, enhance the torque signal perception capability, and improve the test accuracy; the dual-mass flywheel composed of the improved primary mass is an elastomer.

[0059] In practical applications, such as Figure 3 As shown, the strain bridge uses biaxial strain gauges, and arranges the gauges in an equal-arm, symmetrical, full-bridge manner. The strain gauges subjected to the same tensile (compressive) force are placed on opposite sides, and the strain gauges subjected to different forces are placed on adjacent sides, so that the output of the bridge is maximized, and temperature compensation and debending moment coupling are achieved to improve the torque test accuracy. Specifically, Figure 3 1t and 1c are a biaxial strain gauge, 2c and 2t are a biaxial strain gauge, 3t and 3c are a biaxial strain gauge, and 4t and 4c are a biaxial strain gauge, corresponding to the first biaxial strain gauge, the second biaxial strain gauge, the third biaxial strain gauge and the fourth biaxial strain gauge, respectively. Among them, 1t, 2t, 3t and 4t are the compression side of the strain gauge, 1c, 2c, 3c and 4c are the tension side of the strain gauge, "+" is the positive pole of the bridge supply voltage, "-" is the negative pole of the bridge supply voltage, "a" is the positive pole of the bridge output voltage, and "b" is the negative pole of the bridge output voltage.

[0060] When the dual-mass flywheel is working, there will be a wide temperature range change, which will cause the resistance of the four biaxial strain gauges to change, but the sensitive grid temperature of the same strain gauge is the same. Assume that the strain changes of the four strain gauges affected by temperature are Δε 1 , Δε 2 , Δε 3 , Δε 4 , the bridge output is: U o =G[(1c'+Δε 1 )-(1t'+Δε 1 )+(2c'+Δε 2 )-(2t'+Δε 2 )+(3c'+Δε 3 )-(3t'+Δε 3 )+(4c'+Δε 4 )-(4t'+Δε4 )], and calculate U 0 =G(1c'+2c'+3c'+4c'-1t'-2t'-3t'-4t'). Because the biaxial strain gauge is set on the structural beam of the primary mass, when the dual-mass flywheel is subjected to bending moment, the biaxial strain gauges on the four structural beams will be subjected to the same tension and pressure, that is, the tension is equal to the pressure. At this time, the output voltage of the bridge is U 0 =G(1c'+2c'+3c'+4c'-1t'-2t'-3t'-4t')=0, where G represents the bridge and strain sensitivity coefficient, 1c' is the tension on the first biaxial strain gauge, 2c' is the tension on the second biaxial strain gauge, 3c' is the tension on the third biaxial strain gauge, 4c' is the tension on the fourth biaxial strain gauge, 1t' is the pressure on the first biaxial strain gauge, 2t' is the pressure on the second biaxial strain gauge, 3t' is the pressure on the third biaxial strain gauge, and 4t' is the pressure on the fourth biaxial strain gauge. Based on this, it can be seen that under the action of bending moment, the biaxial strain gauges on the two symmetrical structural beams are simultaneously subjected to stresses of equal magnitude and the same nature, so the Wheatstone bridge and difference characteristics are used to achieve decoupling of bending moment and eliminate temperature effects.

[0061] The principle of the engine torque tested by the engine torque test device provided by the present application is to characterize the torque on the primary mass surface of the dual-mass flywheel fixed to the rear end of the engine crankshaft by bolts. In practical application, the engine torque test device provided by the present application is set on the primary mass surface of the dual-mass flywheel, and the real-time torque of the primary mass of the dual-mass flywheel is obtained by actual vehicle test to characterize the real-time torque of the engine. The battery supplies power to the wireless power supply module and the data acquisition assembly, and the accelerator pedal is stepped on. The real-time change of the torque curve is observed through the upper computer software to obtain the real-time torque of the engine. Specifically, the engine torque is transmitted outward and transmitted to the primary mass of the dual-mass flywheel through the bolts. Its surface is twisted, and the strain gauge sensitive grid of the strain bridge set on it is deformed accordingly, and the resistance value of the strain gauge will change. The size of the resistance change is in a certain proportional relationship with the deformation of the primary mass. The analog signal proportional to the strain converted by the circuit is measured, and it is analyzed and processed, so as to realize the measurement of the primary mass torque of the dual-mass flywheel. The primary mass torque of the dual-mass flywheel is the engine torque.

[0062] Traditional magnetoelastic and photoelectric torque measurement methods have high space requirements. It is a feasible solution to arrange a resistive strain sensor between the dual-mass flywheel and the engine housing to test the engine torque. However, the dual-mass flywheel needs to be modified to balance the power transmission reliability and sensor sensitivity. At the same time, it is necessary to consider the problems of wireless power supply in a small space, electromagnetic compatibility of signal transmission, and wide temperature range precision compensation. In this application, four arched grooves are formed by symmetrically arranging circular holes of bowl-shaped plugs on the surface of the primary mass, and there are structural beams between the adjacent four arched grooves. The center lines of the four structural beams are 90°, which can effectively concentrate the surface strain and enhance the torque signal perception ability. It can balance the power transmission reliability and sensor sensitivity and improve the test accuracy.

[0063] This application solves the problem of wireless power supply in a small space by using coils for wireless power supply. The problem of electromagnetic compatibility of signal transmission is solved by using wireless transmission. By arranging the strain bridge in an equal-arm, symmetrical, full-bridge manner, the strain gauges subjected to the same tensile (compressive) force are placed on the opposite sides, and the strain gauges subjected to different forces are placed on the adjacent sides, so that the output of the bridge is maximized, and temperature compensation is achieved at the same time, solving the problem of accuracy compensation in a wide temperature range.

[0064] The present application also provides a specific embodiment, in which the above engine torque test device is installed on a test vehicle for road testing to verify the reliability of the device function. The data acquisition assembly is placed in the test vehicle cabin, the suction cup antenna in the wireless receiver is fixed on the metal frame with its head facing the gearbox, and the stator coil power supply line is led out from the groove set below the crankshaft end face, tied to the pipeline harness with a cable tie and connected to the stator exciter.

[0065] The road test was conducted on the performance track. The road test was conducted on a well-leveled asphalt road and was divided into straight high-speed conditions and low-speed turning conditions. During the test, the wireless receiver signal was strong and the data was recorded completely. This shows that the device signal transmission and wireless power supply functions are stable and reliable.

[0066] An AVL drum torque test is carried out to evaluate the accuracy of the engine torque (referred to as the measured torque) measured synchronously by the vehicle OBD CAN bus based on the engine torque (referred to as the measured torque) measured by the engine torque test device provided in the embodiment of the present application. The OBD CAN bus is connected to the CAN recorder to send the CAN torque to the CAN recorder and store it in the CAN recorder.

[0067] Before the test, prepare the pedal limit device, data acquisition assembly, portable computer, etc., connect the vehicle OBD CAN bus to the CAN recorder, and configure the system sampling frequency to 100Hz. Load the vehicle onto the drum, check that the tire pressure is normal and the fuel volume is sufficient, and then warm up the vehicle for 20 minutes at a constant speed of 100km / h.

[0068] In the early stage of the test, the drum test bench was set to the road simulation mode. After not pressing the accelerator pedal for a period of time, the accelerator pedal was slowly pressed to change the vehicle speed. The engine torque changed with the road resistance. In the later stage, the drum test bench was set to the constant speed mode with a speed of 30km / h. The accelerator pedal opening was controlled by the pedal limit device at 10% and 20% respectively, so that the engine torque had a clear difference and was at two steady-state values, and the stabilization time was greater than 10s. The test curve is shown in Figure 4 As shown, Figure 4 (a), (b), (c), (d), and (e) respectively represent the comparison curve between the measured torque and CAN torque during the bench test, the comparison curve between the measured torque and CAN torque after processing, the accelerator pedal opening curve, the vehicle speed curve, and the engine speed curve. Among them, 10s~20s is approximately the road simulation mode, i.e., the transient working condition, and 42s~78s is approximately the constant speed mode, i.e., the steady-state working condition.

[0069] The original signal is processed by wavelet filtering and smoothing method to obtain Figure 4 (b) in the figure. When the accelerator pedal opening is 0 at the beginning, the drum drives the vehicle to change its speed, the measured torque fluctuates, while the CAN torque does not change. After the accelerator pedal is pressed gently, the two change trends are the same. In the constant speed mode, the measured torque fluctuates, while the CAN torque remains stable. Overall, the two change trends are consistent.

[0070] Under transient conditions, the torque deviation is calculated based on the CAN torque of 0N·m to 50N·m, 50N·m to 75N·m, 75N·m to 100N·m, 100N·m to 125N·m, 125N·m to 150N·m and above 150N·m. Figure 5 , the CAN torque is lower than the 150N·m range, the difference with the measured torque is small, and the maximum deviation value is 9.9N·m; the CAN torque is higher than the 150N·m range, at this time the vehicle accelerator pedal opening decreases from 35% to 0, the difference changes greatly, and the maximum deviation value is -29.16N·m.

[0071] Under steady-state conditions, the torque deviation is calculated by dividing the CAN torque into intervals of 0N·m to 50N·m, 50N·m to 75N·m, 75N·m to 100N·m and 100N·m to 125N·m. Figure 5 The maximum deviation of CAN torque in the range of 0N·m to 50N·m is 22.06N·m, when the pedal opening changes from 0 to 10%; in other ranges, the maximum deviation is around 10N·m.

[0072] In general, the difference between CAN torque and measured torque in transient conditions is small, but the difference in steady-state conditions is large.

[0073] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 7 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store engine torque test data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, an engine torque test method is implemented.

[0074] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the above-mentioned method embodiments when executing the computer program.

[0075] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the above-mentioned method embodiments are implemented.

[0076] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the above-mentioned method embodiments are implemented.

[0077] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0078] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0079] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0080] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. An engine torque testing method, characterized in that: The engine torque testing method comprises: Obtaining the output voltage of the strain bridge at the current moment; the strain bridge is arranged on the primary mass of the dual-mass flywheel; the dual-mass flywheel is connected to the engine; The torque of the engine at the current moment is obtained according to the output voltage of the strain bridge at the current moment and the calibration curve; The determination process of the calibration curve is: Apply torque to the dual-mass flywheel in real time during the historical time period, and collect the output voltage of the strain bridge at each moment during the historical time period; A calibration curve is obtained according to the torque applied to the dual mass flywheel in a historical time period and the output voltage of the strain bridge at each moment in the historical time period; the abscissa of the calibration curve is the output voltage of the strain bridge, and the ordinate of the calibration curve is the torque applied to the dual mass flywheel.

2. The engine torque testing method according to claim 1, characterized in that: The method of obtaining the torque of the engine at the current moment according to the output voltage of the strain bridge at the current moment and the calibration curve specifically includes: Determine the calibration equation according to the calibration curve; The output voltage of the strain bridge at the current moment is input into the calibration equation to obtain the torque of the engine at the current moment.

3. An engine torque testing device, characterized in that: The engine torque testing device comprises: A dual-mass flywheel, a strain bridge, a strain unit and a host computer; the dual-mass flywheel is connected to the engine, the strain bridge is arranged on the primary mass of the dual-mass flywheel, the strain unit is connected to the strain bridge, the strain unit is used to collect the output voltage of the strain bridge, and send the collected output voltage of the strain bridge to the host computer, and the host computer is used to implement the engine torque test method described in any one of claims 1-2.

4. The engine torque testing device according to claim 3, characterized in that: The engine torque testing device further includes: a wireless power supply module, wherein the wireless power supply module is used to supply power to the strain unit, and the strain unit is also used to supply power to the strain bridge.

5. The engine torque testing device according to claim 3, characterized in that: The engine torque testing device further comprises: a data acquisition assembly, and the strain unit is used to send the acquired output voltage of the strain bridge to the host computer through the data acquisition assembly.

6. The engine torque testing device according to claim 5, characterized in that: The engine torque testing device further includes: a wireless transmission module, through which the strain unit transmits the collected output voltage of the strain bridge to the data acquisition assembly.

7. The engine torque testing device according to claim 4, characterized in that: The wireless power supply module includes: a stator exciter, a stator coil and a rotor coil connected in sequence, the stator exciter is used to supply power to the stator coil so that the stator coil generates a magnetic field, the rotor coil is used to cut the magnetic field generated by the stator coil, and the rotor coil is connected to the strain unit to supply power to the strain unit.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the engine torque testing method according to any one of claims 1 to 2.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the engine torque testing method described in any one of claims 1 to 2 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the engine torque testing method described in any one of claims 1 to 2 is implemented.

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