Electric vehicle three-electrics comprehensive testing platform achieving synchronous control of front and rear electric motors, and testing method

Abstract

An electric vehicle three-electrics comprehensive testing platform achieving synchronous control of front and rear electric motors. The testing platform comprises a right front wheel testing mechanism (Ⅰ), a left front wheel testing mechanism (Ⅱ), a right rear wheel testing mechanism (Ⅲ), a left rear wheel testing mechanism (Ⅳ) and a wheelbase adjustment device (Ⅴ), wherein the right front wheel testing mechanism (Ⅰ) and the left front wheel testing mechanism (Ⅱ) have the same structure; the right rear wheel testing mechanism (Ⅲ) and the left rear wheel testing mechanism (Ⅳ) have the same structure; the four mechanisms are arranged on a horizontal foundation plane at the same depth; the right front wheel testing mechanism (Ⅰ) comprises a front driving roller (A), a front driven roller (B), a front lifting device (C) and a front wheel electric motor (D); the right rear wheel testing mechanism comprises a rear driving roller (K), a rear driven roller (L), a rear lifting device (M), a blocking device (N), a locking mechanism (O) and a rear wheel electric motor (Q); the wheelbase adjustment device (Ⅴ) adjusts the distance between a front wheel electric motor base (H) and a support for the rear wheel testing mechanisms; and the front wheel electric motor (D) and the rear wheel electric motor (Q) are synchronously controlled by a controller during a testing process. Further provided is a testing method based on the electric vehicle three-electrics comprehensive testing platform achieving synchronous control of front and rear electric motors.

Description

Electric vehicle three-electric integrated test bench and test method with synchronous control of front and rear motors

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202311603880.7 filed with the Patent Office of China on November 28, 2023, entitled “Electric Vehicle Three-Electric Integrated Test Bench and Test Method with Synchronous Control of Front and Rear Motors”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present invention belongs to the technical field of electric vehicle detection, and in particular relates to an electric vehicle three-electric integrated detection platform and a detection method for synchronously controlling front and rear motors. Background Art

[0004] Electric vehicles (EVs) are gaining widespread attention as a clean energy vehicle. The core components of EVs include power batteries, electric drive systems, and electronic control systems. Accurate testing and evaluation of these critical systems are crucial to ensuring EV performance and safety.

[0005] At present, there are some challenges in the field of electric vehicle testing. First, different types of drive systems have different characteristics and requirements. Especially under rapidly changing working conditions, such as sudden acceleration and braking, the power output of the test bench may not be able to fully meet the needs of electric vehicles, which may cause the ESP system to misjudge the vehicle stability and trigger an alarm. This poses a challenge to the high-precision synchronous control of the detection device. Secondly, the power battery is the energy source of electric vehicles. Therefore, accurate measurement of parameters such as the voltage, current, temperature and SOC value of the power battery pack is necessary. In addition, in view of the particularity of the requirements for the power performance and economic performance testing projects of in-use electric vehicles, a separate comprehensive testing station for the three-electric (battery, motor, and electronic control) system must be set up. At this testing station, the power performance and economic performance of the electric vehicle are comprehensively examined, and the performance status of the electric vehicle battery system, electric drive system and electronic control system is then evaluated.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to address the problems in the above-mentioned prior art and provide an electric vehicle three-electric integrated test bench and test method with synchronous control of the front and rear motors, which can realize synchronous control of the front and rear motors, so as to comprehensively examine the power performance and economic performance of the electric vehicle under corresponding test conditions, and then evaluate the performance status of the electric vehicle battery system, electric drive system and electronic control system.

[0008] In order to achieve the above object, the present invention has the following technical solutions:

[0009] An electric vehicle three-electric integrated test bench with synchronous control of front and rear motors, comprising:

[0010] A right front wheel detection mechanism, a left front wheel detection mechanism, a right rear wheel detection mechanism, a left rear wheel detection mechanism, and a wheelbase adjustment device; the right front wheel detection mechanism and the left front wheel detection mechanism have the same structure, and the right rear wheel detection mechanism and the left rear wheel detection mechanism have the same structure, and are all arranged on a horizontal foundation plane at the same depth;

[0011] The transverse center lines of the right front wheel detection mechanism and the left front wheel detection mechanism coincide with each other, and the transverse center lines of the right rear wheel detection mechanism and the left rear wheel detection mechanism coincide with each other; the wheelbase adjustment device is placed between the right rear wheel detection mechanism and the left rear wheel detection mechanism, and the transverse center lines of the three coincide with each other;

[0012] The right front wheel detection mechanism includes a front active roller, a front driven roller, a front lifting device, and a front wheel motor. The front active roller and the front driven roller have consistent motion states. The front active roller is connected to the front wheel motor and driven by the front wheel motor for transmission. The front lifting device can raise and lower the front active roller and the front driven roller. The right front wheel detection mechanism is arranged on the front wheel motor base, and the lower part of the front wheel motor base is mounted on a combined track consisting of left and right direction tracks and front and rear direction tracks.

[0013] The right rear wheel detection mechanism includes a rear active roller, a rear driven roller, a rear lifting device, a blocking device, a locking mechanism, and a rear wheel motor. The movement states of the rear active roller and the rear driven roller are consistent, and the rear wheel motor is connected to drive the rear active roller; the rear lifting device can raise and lower the rear active roller and the rear driven roller; the blocking device is used to prevent the wheel from moving out of the detection position during the test; the locking mechanism can lock the rear active roller and the rear driven roller, and the locking mechanism is connected to the rear lifting device through a connecting rod mechanism; the right rear wheel detection mechanism is set on a bracket, the bottom of the bracket is installed on the rear track, and the rear track is linked to the combined track below the front wheel detection mechanism;

[0014] The wheelbase adjustment device adjusts the distance between the front wheel motor base and the bracket of the rear wheel detection mechanism;

[0015] The front wheel motor and the rear wheel motor are synchronously controlled by the controller during the detection process.

[0016] As a preferred solution, the front active roller and the front driven roller have the same structure, and one end of the two is connected by a belt to keep their motion states consistent, and the gear at the other end of the front active roller is connected to the gear on one side of the front wheel motor through a belt, and is driven by the front wheel motor for transmission; the front lifting device is located at the center of the front active roller and the front driven roller, and the lower end of the front lifting device is connected to the front lifting air pump through a connecting rod mechanism, and the front lifting air pump is fixed on the front wheel motor base and is parallel to the side line of the front wheel motor base; the left and right direction rails are perpendicular to the front and rear direction rails, and the front and rear direction rails are located below the left and right direction rails.

[0017] As a preferred solution, the front driving roller includes a cylindrical roller, a bearing, a bearing seat and a front driving roller gear; the bearing is matched with the central axis of the cylindrical roller, and the side of the bearing is in contact with the side of the cylindrical roller; the bearing seat is in contact with the side of the front driving roller gear, and the center is matched with the central axis of the cylindrical roller; the front driving roller has a symmetrical structure, and the bearing, bearing seat and front driving roller gear are arranged on both sides of the cylindrical roller in the same assembly method.

[0018] As a preferred solution, the right front wheel detection mechanism further includes a front lift air pump, which is fixed to the front wheel motor base via a front air pump chassis; the front lift device is connected to the upper end of the front lift air pump via a connecting rod mechanism, and the front lift device is driven by the front lift air pump to move up and down;

[0019] The right rear wheel detection mechanism also includes a rear lift air pump, which includes a rear air pump body, a rear air pump base and a rear connecting rod mechanism; the lower end of the rear air pump body is connected to the rear air pump base; the rear air pump base is fixed to the detection platform bracket by bolts; the rear air pump body is connected to the rear lifting device through the rear connecting rod mechanism, driving the lifting device to move up and down.

[0020] As a preferred solution, the left and right tracks are composed of two first track assemblies with the same structure, and the two first track assemblies are symmetrically arranged on both sides of the front wheel motor base. Each track has two symmetrically arranged track clips, and each track has a partition at the top for blocking. The front and rear tracks are composed of two second track assemblies with the same structure, and each track has two symmetrically arranged track clips, and each track has a partition at the top for blocking.

[0021] The rear track includes a track buckle, a track baffle and a third track assembly; the track buckle is fixed to both ends of the chassis support to drive the right rear wheel detection mechanism to move on the track; the track baffle is fixed to both ends of the third track assembly.

[0022] As a preferred solution, the bracket consists of a lower bracket, a middle bracket and an upper bracket; the right rear wheel detection mechanism also includes a rear lift air pump; the rear track is fixed on the lower bracket; the rear lift air pump is fixed at the middle position of the middle bracket and is connected to the rear lift device through a connecting rod mechanism; the rear wheel motor is fixed on one side of the middle bracket, and the gear of the rear wheel motor is connected to the gear of the rear active roller through a belt; the gears on both sides of the rear active roller and the rear driven roller are fixed to the upper bracket through a bearing seat, and one side gear is transmitted through a belt connection; the blocking device is located in the middle position of the rear active roller and the rear driven roller; the locking mechanism is installed on both sides of the rear active roller and the rear driven roller, and is fixed to the upper bracket by bolts; the locking mechanism is located on both sides of the rear lift air pump and is connected to the rear lift device through a connecting rod mechanism.

[0023] As a preferred solution, the rear active roller includes a cylindrical roller, two bearing seats and two gears; the bearing seat matches the central axis of the cylindrical roller, and the two bearing seats are symmetrically installed on both sides of the cylindrical roller; the side surfaces of the bearing seat and the gear coincide with each other, and the centers of the bearing seat and the gear match the central axis of the cylindrical roller; the rear active roller has a symmetrical structure, and the two bearing seats and the two gears are arranged in the same manner on both sides of the rear active roller; the structure and installation method of the rear driven roller are the same as those of the rear active roller, and the gear on one side of the rear driven roller is connected to the gear of the rear active roller through a belt, so that the motion state of the rear active roller and the rear driven roller remain consistent.

[0024] As a preferred solution, the blocking device includes a cylindrical roller, a bearing seat and a spring; the two bearing seats are symmetrically arranged on both sides of the cylindrical roller, and the centers are matched with the axis of the cylindrical roller. The lower end of the bearing seat is fixed to the support plate by bolts, the lower surface of the support plate is connected to the spring, and the other end of the spring is fixed to the bracket.

[0025] As a preferred solution, the wheelbase adjustment device includes a wheelbase motor, an intermediate shaft, a coupling, a screw protection cover, a screw and a chassis support; the upper ends of the two chassis supports are respectively fixed under the chassis of the right rear wheel detection mechanism and the left rear wheel detection mechanism; the screw passes through the circular hole in the center of the two chassis supports; the screw protection cover covers the screw passing through the chassis support; the coupling is fixed to the end of the screw by a screw; the intermediate shaft is fixed to the end of the coupling by a screw; the wheelbase motor is fixed to the end of the intermediate shaft by a screw.

[0026] A detection method of the electric vehicle three-electric integrated test bench based on the synchronous control of the front and rear motors comprises the following steps:

[0027] Before the test, the wheelbase adjustment device is used to move the brackets supporting the right rear wheel detection mechanism and the left rear wheel detection mechanism forward and backward on the track according to the wheelbase of the test vehicle, so that the distance between the front and rear wheel detection mechanisms is consistent with the wheelbase of the test vehicle; the front and rear lifting devices are in the raised state, with the upper ends flush with the ground; the blocking device is lowered to the same height as the rear driving roller and the rear driven roller, and the test vehicle is driven into the test bench; after the test vehicle enters the test bench and the front and rear wheels fall between the driving and driven rollers, the blocking device is raised to prevent the wheels from moving out of the detection position during the test; the front and rear lifting devices are then lowered, so that the wheels are suspended between the driving and driven rollers;

[0028] During the test, the front and rear wheel motors are synchronously controlled using a PID control algorithm. According to the performance test requirements of the test vehicle, under the corresponding test conditions, the load of the test vehicle when driving on the test bench under various road driving conditions is simulated, and the voltage, current, temperature of the single cells in the power battery pack and the SOC value of the battery pack are read, and the performance status of the battery system, electric drive system and electronic control system of the test vehicle are evaluated.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] The front wheel motor and the rear wheel motor are synchronously controlled by the controller during the detection process, which can keep the rollers of the front and rear wheel detection mechanisms synchronized with each other with high precision, thereby effectively solving the ESP alarm problem of electric vehicles. The detection platform of the present invention is connected to the electric vehicle power battery management system through a power battery special detection device, which can read the voltage, current, temperature and battery pack SOC value of the battery in the test vehicle power battery pack. According to the fast working conditions required by the electric vehicle performance test, the chassis dynamometer is loaded with force output control. Under the corresponding test conditions, the power performance and economic performance of the electric vehicle are comprehensively examined, and the total voltage, current and temperature of the power battery are monitored by a voltmeter, ammeter and temperature tester; the control system analyzes and calculates the detection data of each device and instrument according to the studied electric vehicle power performance test method and economic performance test method, and then evaluates the performance status of the electric vehicle battery system, electric drive system and electronic control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of the overall structure of an electric vehicle three-electric integrated test bench with synchronous control of front and rear motors according to an embodiment of the present invention;

[0032] FIG2 is a schematic structural diagram of a right front wheel detection mechanism of a detection platform according to an embodiment of the present invention;

[0033] FIG3 is a schematic structural diagram of the front active roller of the right front wheel detection mechanism according to an embodiment of the present invention;

[0034] FIG4 is a schematic structural diagram of a lift air pump of a right front wheel detection mechanism according to an embodiment of the present invention;

[0035] FIG5 is a schematic structural diagram of a track assembly of a right front wheel detection mechanism according to an embodiment of the present invention;

[0036] FIG6 is a schematic structural diagram of a right rear wheel detection mechanism of a detection platform according to an embodiment of the present invention;

[0037] FIG7 is a schematic structural diagram of the rear active roller and blocking device of the right rear wheel detection mechanism according to an embodiment of the present invention;

[0038] FIG8 is a schematic diagram of the lift air pump and track structure of the right rear wheel detection mechanism according to an embodiment of the present invention;

[0039] FIG9 is a schematic structural diagram of a wheelbase adjustment device of a test bench according to an embodiment of the present invention;

[0040] FIG10 is a schematic diagram showing the principle of the PID control algorithm used in an embodiment of the present invention;

[0041] FIG11 is a schematic diagram of a dual-motor control simulation model based on a PID control algorithm according to an embodiment of the present invention;

[0042] FIG12 is a graph comparing the torque outputs of the front and rear motors of the test bench according to an embodiment of the present invention;

[0043] FIG13 is a graph showing simulation results of synchronous control of front and rear motors of a test bench according to an embodiment of the present invention;

[0044] FIG14 is a schematic diagram of an online control process of a detection station according to an embodiment of the present invention;

[0045] FIG15 is a schematic diagram of a wheelbase adjustment control process of a test bench according to an embodiment of the present invention;

[0046] FIG16 is a schematic diagram of the inertia switching control flow of the test bench according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0048] 1 , an electric vehicle three-electric integrated testing platform with synchronous control of front and rear motors according to an embodiment of the present invention includes a right front wheel testing mechanism I, a left front wheel testing mechanism II, a right rear wheel testing mechanism III, a left rear wheel testing mechanism IV and a wheelbase adjustment device V.

[0049] Among them, the right front wheel detection mechanism I and the left front wheel detection mechanism II have the same structure, and the right rear wheel detection mechanism III and the left rear wheel detection mechanism IV have the same structure. They are all installed on a horizontal foundation plane at the same depth. The right front wheel detection mechanism I and the left front wheel detection mechanism II are aligned and placed in front of the entire detection platform, and the right rear wheel detection mechanism III and the left rear wheel detection mechanism IV are aligned and placed in the rear of the entire detection platform. At the same time, the transverse centerlines of the right front wheel detection mechanism I and the left front wheel detection mechanism II coincide, and the transverse centerlines of the right rear wheel detection mechanism III and the left rear wheel detection mechanism IV coincide. Furthermore, the wheelbase adjustment device V is placed between the right rear wheel detection mechanism III and the left rear wheel detection mechanism IV, and the transverse centerlines of the three coincide.

[0050] Referring to Figures 2 to 5 , the right front wheel detection mechanism I of the embodiment of the present invention comprises a front driving roller A, a front driven roller B, a front lifting device C, a front wheel motor D, a front lift air pump E, a left-right track F, a front-back track G, a front wheel motor base H, a pinion I, and a gear J. The front driving roller A and the front driven roller B have identical structures, one end of which is connected by a belt to maintain consistent motion. The gear on the other end of the front driving roller A is connected to a gear on one side of the front wheel motor D via a belt, driven by the motor for transmission. The front lifting device C is located at the center of the front driving roller A and the front driven roller B. Its lower end is connected to the front lift air pump E via a connecting rod mechanism. The front lift air pump E is fixed to the front wheel motor base H, parallel to its edge. The pinion I and gear J are meshed and positioned below the front wheel motor base H. The left-right track F and the front-back track G are perpendicular to each other, and the front-back track G is located below the left-right track F.

[0051] The front driving roller A includes a cylindrical roller 1, two bearings 2, two bearing seats 3 and two front driving roller gears 4; the bearing 2 is matched with the central axis of the cylindrical roller 1 and the side of the bearing 2 is in contact with the side of the cylindrical roller 1; the bearing seat 3 is in contact with the side of the front driving roller gear 4, and the center of each is matched with the central axis of the cylindrical roller 1; the front driving roller A has a symmetrical structure, and the bearing 2, bearing seat 3 and front driving roller gear 4 are located on both sides of the driving roller 1 in the same manner.

[0052] The front lift air pump E is fixed to the front wheel motor base H through the air pump base 5. As shown in Figure 4, the air pump base 5 is fixed to the front wheel motor base H by four bolts symmetrically distributed at the bottom; the front lift device C is connected to the upper end of the front lift air pump E through three connecting rod mechanisms, and the front lift air pump E drives the front lift device C to rise and fall.

[0053] Referring to Figure 5, the left and right direction track F is composed of two first track assemblies 6 with the same structure. The two first track assemblies 6 are symmetrically arranged on both sides of the base. Each track has two track clips 8 symmetrically arranged on the track, and each track has a partition at the top for blocking; the front and rear direction track G is composed of two second track assemblies 7 with the same structure. Each track has two track clips 8 symmetrically arranged on the track, and each track has a partition at the top for blocking.

[0054] Referring to Figure 6, the right rear wheel detection mechanism III includes a rear active roller K, a rear driven roller L, a rear lifting device M, a blocking device N, a locking mechanism O, a rear lifting air pump P, a rear wheel motor Q and a rear track R; wherein, the rear track R is fixed on the lowest bracket; the rear lifting air pump P is fixed at the middle position of the middle bracket and is connected to the rear lifting device M through a connecting rod mechanism; the rear wheel motor Q is fixed on the left side of the middle bracket, and the gear of the rear wheel motor Q is connected to the gear of the active roller K through a belt; the gears on both sides of the rear active roller K and the rear driven roller L are fixed to the upper bracket through a bearing seat, and one side gear is connected through a belt for transmission; the blocking device N is located in the middle position of the rear active roller K and the rear driven roller L; the locking mechanism O is installed on both sides of the rear active roller K and the rear driven roller L, and is fixed to the upper bracket by bolts; the locking mechanism O is located on both sides of the rear lift air pump P, and is connected to the rear lifting device M through a connecting rod mechanism.

[0055] Referring to Figure 7, the rear active roller K includes a cylindrical roller 9, two bearing seats 10 and two gears 11; the bearing seats 10 are matched with the central axis of the cylindrical roller 9, and the two bearing seats 10 are symmetrically installed on both sides of the cylindrical roller 9 and are also fixed to the bracket by bolts; the side surfaces of the bearing seats 10 and the gears 11 fit together, and their centers are matched with the central axis of the cylindrical roller 9; the rear active roller K has a symmetrical structure, and the bearing seats 10 and gears 11 are located on both sides of the rear active roller K in the same manner.

[0056] The structure and installation method of the rear driven roller L are the same as those of the rear active roller K. The gear on its left side is connected to the gear of the rear active roller K through a belt, so that the movement state remains consistent.

[0057] The blocking device N includes a cylindrical drum 12, two bearing seats 13 and two springs 14; the bearing seats 13 are symmetrically arranged on both sides of the cylindrical drum 12, and their centers are matched with the axis of the cylindrical drum 12. The lower end of the bearing seat 13 is fixed to an iron plate by bolts, and the lower end of the iron plate is connected to two springs 14, and the other end of the spring 14 is fixed to the bracket.

[0058] Referring to Figure 8, the rear lift air pump P includes an air pump body 15, an air pump base 16 and a connecting rod mechanism 17. The lower end of the air pump body 15 is connected to the air pump base 16; the air pump base 16 is fixed to the test bench bracket by four bolts; the air pump body 15 is connected to the rear lift device M through the connecting rod mechanism 17, driving the lifting block to move up and down.

[0059] The rear track R includes two track clips 18, two track baffles 19 and a third track assembly 20, wherein the track clips 18 are fixed at both ends of the inspection platform bracket, driving the right rear wheel inspection mechanism III to move on the track; the two track baffles 19 are fixed at both ends of the third track assembly 20.

[0060] Referring to Figure 9, the wheelbase adjustment device V includes a wheelbase motor S, an intermediate shaft T, a coupling U, two screw protection covers V, a screw W, and two chassis supports X; the upper ends of the two chassis supports X are fixed to the lowermost ends of the brackets of the right rear wheel detection mechanism III and the left rear wheel detection mechanism III; the screw W passes through the circular hole in the center of the two chassis supports X; the screw protection cover V covers the screw W passing through the chassis supports X; the coupling U is fixed to the right end of the screw W by four screws; the intermediate shaft T is fixed to the right end of the coupling U by four screws; and the wheelbase motor S is fixed to the right end of the intermediate shaft T by four screws.

[0061] The front and rear wheel motors D and Q in the test bench of this embodiment of the present invention are synchronously controlled using a PID control algorithm. Simulation verification demonstrates that dual-motor synchronization is achieved within 0.03 seconds, meeting the requirements for fast synchronization. The PID control algorithm is a controller that controls the deviation according to its proportional (P), integral (I), and differential (D) parameters. The independent regulation of its control parameters is an effective method for dynamic quality correction of continuous systems.

[0062] The principle mechanism of the PID algorithm used in the embodiment of the present invention is shown in FIG10 . r(t) is the given value of the system, and y(t) is the actual feedback value of the output of the control system. The difference between the two can be used to obtain the deviation e(t), which is expressed as: e(t) = r(t) - y(t) (1)

[0063] The error signal e(t) is defined as the input of the PID controller, and the output u(t) can be obtained by combining proportional, integral, and differential. The calculation formula of the analog PID is as follows:

[0064] Where Kp is the proportional time constant, Ti is the integral time constant, and dT is the differential time constant.

[0065] Then, the analog PID control formula (2) is further discretized to meet the subsequent application requirements. The sampling period is T. When t=kT, the discrete PID control formula is obtained:

[0066] After simplifying formula (3), we can get:

[0067] K1 is the integral coefficient, K D is the differential coefficient, e(k), e(k-1) are the corresponding errors.

[0068] Based on formula (4), we can clearly and intuitively understand that the output of the PID algorithm is correlated with the system state at the previous moment. If e(k) is accumulated, it will significantly increase the difficulty of data processing. Therefore, this operation should generally not be performed. If e(k) fluctuates when the system is operating abnormally or unstable, it will inevitably cause the output to change accordingly. Based on formula (4), we can recursively obtain:

[0069] The front wheel motor D and the rear wheel motor Q are synchronously controlled using the above formula, and the simulation model is shown in FIG11 .

[0070] FIG12 is a comparison curve of the front and rear motor torque outputs obtained by simulating and verifying the PID synchronous control of the front-wheel motor D and the rear-wheel motor Q. In the figure, at the time of 0.4s, after applying different loads to the two motors, it can be clearly seen that PID can control the dual motors to quickly complete synchronous control within 0.03s, with excellent control effect.

[0071] Based on the device's operating conditions, motor synchronization control simulations were conducted using different loads and loading times. The simulation results, shown in Figure 13, show that the front-wheel motor D and rear-wheel motor Q complete the process from startup to synchronization within 0s to 0.3s. After applying different loads to the front-wheel motor D and rear-wheel motor Q simultaneously at 0.6s, the PID control system achieves dual-motor synchronization within 0.03s.

[0072] The embodiment of the present invention also provides a method for detecting the three-electric system of an electric vehicle, which utilizes the above-mentioned electric vehicle three-electric system integrated detection platform with synchronous control of the front and rear motors. The overall online control process is shown in Figure 14. Before the vehicle to be tested enters the test platform for testing, the vehicle is first lifted up using a lift to ensure that it can enter the test platform and wait for the vehicle arrival signal. After the vehicle is in place, the wheelbase of the test platform is adjusted according to the wheelbase information of the vehicle, accurate to millimeters, and the drive wheel inertia is adapted. Subsequently, the vehicle is controlled according to the standard operating condition prompts to complete the entire test process. During the coasting stage, the vehicle speed range is not controlled, and in the subsequent acceleration, braking and uniform speed sections, the vehicle is required to operate within the standard operating speed range of ±3.0km / h.

[0073] During the entire working process, real-time data is collected, including the vehicle's operating mode, the total voltage and total current of the power battery, the highest and lowest voltages of the single cells, the highest and lowest temperatures of the motor, the real-time temperature of the controller, the real-time temperature of the DC / DC controller, the accelerator pedal opening, the brake pedal opening, SOC (battery state of charge), the real-time torque of the motor, the motor speed, the real-time speed of the vehicle, and the loading force on the tire surface.

[0074] Before the test begins, that is, before the vehicle enters the test bench, the test vehicle's wheelbase is input into the test bench controller. Using the wheelbase adjustment device V, the motor drives the coupling to adjust the length of the screw, causing the support frame supporting the right rear wheel detection mechanism III and the left rear wheel detection mechanism IV to move back and forth on the track, thereby aligning the distance between the front and rear lifting blocks with the wheelbase of the vehicle under test. The front and rear lifting devices are in their highest position, with their upper ends flush with the ground. The rollers at both ends of the blocking device N are lowered to the same height as the rear driving roller K and the rear driven roller L, allowing the vehicle to enter the test bench. After the vehicle enters the test bench and the front and rear wheels fall onto the lifting device between the master and slave rollers, the rollers at both ends of the blocking device N rise to their highest position to ensure that the vehicle does not exit the device during the test. The front and rear lifting devices then slowly descend to their lowest position, leaving the wheels suspended between the master and slave rollers.

[0075] During the test, personnel controlled the chassis dynamometer's load output, simulating the loads of an electric vehicle on a test bench under various road conditions, based on the requirements of the electric vehicle's performance testing. Using various sensors on the test bench and specialized power battery testing equipment connected to the electric vehicle's power battery management system, they read the voltage, current, temperature, and SOC value of the individual cells in the power battery pack.

[0076] After the test, the front and rear lifting devices slowly rise to the highest position, with the upper ends flush with the ground, and the rollers at both ends of the blocking device N slowly descend. After the vehicle completes the test, it drives out of the test bench.

[0077] The electric vehicle three-electric integrated test bench has a wheelbase adjustment function, and its process is shown in Figure 15. Before the vehicle goes online, the front stand is moved back and forth according to the wheelbase information of the vehicle to be tested to ensure that both axles of the vehicle are parked on the stand. At the same time, during the wheelbase adjustment process, preparations for vehicle testing are carried out to shorten the detection time and synchronize the connection of the OBD equipment. The wheelbase adjustment is based on the current distance between the two stands and the difference in the vehicle wheelbase, and a control instruction for adjusting the distance is sent to the wheelbase adjustment servo. At the same time, during the adjustment process, it is judged whether the target wheelbase value is reached, and whether the wheelbase adjustment reaches the maximum and minimum margins of the wheelbase to prevent danger during the adjustment process. During the adjustment process, the indicator light reminds personnel that the stand is moving.

[0078] In particular, the inertia selection function is a sub-function of the detection. Its detection process is shown in Figure 16. In order to simulate the inertia of the vehicle during road driving and meet the detection needs of vehicles of different weights, the inertia selection is switched according to the parking position of the drive wheel, and necessary protection judgment is made during the control process.

[0079] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection, an electrical connection, or communication; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and replacements, and these modifications and replacements are also within the scope of protection covered by the claims.

Claims

1. An electric vehicle three-electric integrated test bench with synchronous control of front and rear motors, characterized in that: include: A right front wheel detection mechanism (I), a left front wheel detection mechanism (II), a right rear wheel detection mechanism (III), a left rear wheel detection mechanism (IV) and a wheelbase adjustment device (V); the right front wheel detection mechanism (I) and the left front wheel detection mechanism (II) have the same structure, and the right rear wheel detection mechanism (III) and the left rear wheel detection mechanism (IV) have the same structure, and are all arranged on a horizontal foundation plane at the same depth; The transverse center lines of the right front wheel detection mechanism (I) and the left front wheel detection mechanism (II) coincide with each other, and the transverse center lines of the right rear wheel detection mechanism (III) and the left rear wheel detection mechanism (IV) coincide with each other; the wheelbase adjustment device (V) is placed between the right rear wheel detection mechanism (III) and the left rear wheel detection mechanism (IV), and the transverse center lines of the three coincide with each other; The right front wheel detection mechanism (Ⅰ) includes a front active roller (A), a front driven roller (B), a front lifting device (C) and a front wheel motor (D). The motion states of the front active roller (A) and the front driven roller (B) are consistent. The front active roller (A) is connected to the front wheel motor (D) and driven by the front wheel motor (D) for transmission. The front lifting device (C) can lift and lower the front active roller (A) and the front driven roller (B). The right front wheel detection mechanism (Ⅰ) is arranged on the front wheel motor base (H), and the lower part of the front wheel motor base (H) is installed on a combined track composed of a left-right direction track (F) and a front-back direction track (G). The right rear wheel detection mechanism (III) includes a rear active roller (K), a rear driven roller (L), a rear lifting device (M), a blocking device (N), a locking mechanism (O) and a rear wheel motor (Q). The motion states of the rear active roller (K) and the rear driven roller (L) are consistent, and the rear wheel motor (Q) is connected to drive the rear active roller (K); the rear lifting device (M) can lift and lower the rear active roller (K) and the rear driven roller (L); the blocking device (N) is used to prevent the wheel from driving out of the detection position during the test; the locking mechanism (O) can lock the rear active roller (K) and the rear driven roller (L), and the locking mechanism (O) is connected to the rear lifting device (M) through a connecting rod mechanism; the right rear wheel detection mechanism (III) is arranged on a bracket, and the bottom of the bracket is installed on the rear track (R), and the rear track (R) is linked with the combined track below the front wheel detection mechanism; The wheelbase adjustment device (V) adjusts the distance between the front wheel motor base (H) and the bracket of the rear wheel detection mechanism; The front wheel motor (D) and the rear wheel motor (Q) are synchronously controlled by a controller during the detection process.

2. According to the electric vehicle three-electric integrated testing platform with synchronous control of front and rear motors as described in claim 1, it is characterized in that: The front active roller (A) and the front driven roller (B) have the same structure, and one end of the two are connected by a belt so that the movement states of the two are consistent. The gear at the other end of the front active roller (A) is connected to the gear on one side of the front wheel motor (D) through a belt, and is driven by the front wheel motor (D) for transmission; the front lifting device (C) is located at the center of the front active roller (A) and the front driven roller (B), and the lower end of the front lifting device (C) is connected to the front lifting air pump (E) through a connecting rod mechanism, and the front lifting air pump (E) is fixed on the front wheel motor base (H) and is parallel to the sideline of the front wheel motor base (H); the left and right direction track (F) and the front and rear direction track (G) are perpendicular to each other, and the front and rear direction track (G) is located below the left and right direction track (F).

3. According to claim 2, the electric vehicle three-electric integrated test platform with synchronous control of front and rear motors is characterized in that: The front driving roller (A) comprises a cylindrical roller (1), a bearing (2), a bearing seat (3) and a front driving roller gear (4); the bearing (2) matches the central axis of the cylindrical roller (1), and the side of the bearing (2) fits the side of the cylindrical roller (1); the bearing seat (3) fits the side of the front driving roller gear (4), and the center of each of them matches the central axis of the cylindrical roller (1); the front driving roller (A) is a symmetrical structure, and the bearing (2), the bearing seat (3) and the front driving roller gear (4) are arranged on both sides of the cylindrical roller (1) in the same assembly manner.

4. According to claim 2, the electric vehicle three-electric integrated test platform with synchronous control of front and rear motors is characterized in that: The right front wheel detection mechanism (I) further comprises a front lift air pump (E), which is fixed to the front wheel motor base (H) via a front air pump chassis (5); the front lift device (C) is connected to the upper end of the front lift air pump (E) via a connecting rod mechanism, and the front lift device (C) is driven by the front lift air pump (E) to be raised or lowered; The right rear wheel detection mechanism (III) also includes a rear lift air pump (P), which includes a rear air pump body (15), a rear air pump base frame (16) and a rear connecting rod mechanism (17); the lower end of the rear air pump body (15) is connected to the rear air pump base frame (16); the rear air pump base frame (16) is fixed to the detection platform bracket by bolts; the rear air pump body (15) is connected to the rear lift device (M) by the rear connecting rod mechanism (17), driving the lift device (M) to move up and down.

5. According to claim 2, the electric vehicle three-electric integrated test platform with synchronous control of front and rear motors is characterized in that: The left-right track (F) is composed of two first track assemblies (6) of the same structure, the two first track assemblies (6) are symmetrically arranged on both sides of the front wheel motor base (H), each track has two symmetrically arranged track buckles (8), and each track has a partition plate at the top for blocking; the front-back track (G) is composed of two second track assemblies (7) of the same structure, each track has two symmetrically arranged track buckles (8), and each track has a partition plate at the top for blocking; The rear track (R) comprises a track buckle (18), a track baffle (19) and a third track assembly (20); the track buckle (18) is fixed at both ends of the chassis support to drive the right rear wheel detection mechanism (III) to move on the track; the track baffle (19) is fixed at both ends of the third track assembly (20).

6. The electric vehicle three-electric integrated testing platform with synchronous control of front and rear motors according to claim 1 is characterized in that: The bracket is composed of a lower bracket, a middle bracket and an upper bracket; the right rear wheel detection mechanism (III) also includes a rear lift air pump (P); the rear track (R) is fixed on the lower bracket; the rear lift air pump (P) is fixed at the middle position of the middle bracket and is connected to the rear lift device (M) through a connecting rod mechanism; the rear wheel motor (Q) is fixed on one side of the middle bracket, and the gear of the rear wheel motor (Q) is connected to the gear of the rear active roller (K) through a belt; the gears on both sides of the rear active roller (K) and the rear driven roller (L) are fixed on the upper bracket through a bearing seat, and one side of the gear is connected through a belt for transmission; the blocking device (N) is located in the middle position of the rear active roller (K) and the rear driven roller (L); the locking mechanism (O) is installed on both sides of the rear active roller (K) and the rear driven roller (L), and is fixed to the upper bracket by bolts; the locking mechanism (O) is located on both sides of the rear lift air pump (P), and is connected to the rear lift device (M) through a connecting rod mechanism.

7. The electric vehicle three-electric integrated test platform with synchronous control of front and rear motors according to claim 6 is characterized in that: The rear active roller (K) comprises a cylindrical roller (9), two bearing seats (10) and two gears (11); the bearing seat (10) matches the central axis of the cylindrical roller (9), and the two bearing seats (10) are symmetrically installed on both sides of the cylindrical roller (9); the side surfaces of the bearing seat (10) and the gear (11) coincide with each other, and the centers of the bearing seat (10) and the gear (11) match the central axis of the cylindrical roller (9); the rear active roller (K) is a symmetrical structure, and the two bearing seats (10) and the two gears (11) are arranged on both sides of the rear active roller (K) in the same manner; the structure and installation method of the rear driven roller (L) are the same as those of the rear active roller (K), and a gear on one side of the rear driven roller (L) is connected to the gear of the rear active roller (K) through a belt, so that the movement states of the rear active roller (K) and the rear driven roller (L) remain consistent.

8. The electric vehicle three-electric integrated testing platform with synchronous control of front and rear motors according to claim 6 is characterized in that: The blocking device (N) comprises a cylindrical roller (12), a bearing seat (13) and a spring (14); the two bearing seats (13) are symmetrically arranged on both sides of the cylindrical roller (12), and the centers thereof match the axis of the cylindrical roller (12); the lower ends of the bearing seats (13) are fixed to a support plate by bolts; the lower surface of the support plate is connected to the spring (14); and the other end of the spring (14) is fixed to a bracket.

9. The electric vehicle three-electric integrated testing platform with synchronous control of front and rear motors according to claim 1 is characterized in that: The wheelbase adjustment device (V) comprises a wheelbase motor (S), an intermediate shaft (T), a coupling (U), a screw protection cover (V), a screw (W) and a chassis support (X); the upper ends of the two chassis supports (X) are respectively fixed under the chassis of the right rear wheel detection mechanism (III) and the left rear wheel detection mechanism (IV); the screw (W) passes through the circular hole in the center of the two chassis supports (X); the screw protection cover (V) covers the screw (W) passing through the chassis support (X); the coupling (U) is fixed to the end of the screw (W) by screws; the intermediate shaft (T) is fixed to the end of the coupling (U) by screws; the wheelbase motor (S) is fixed to the end of the intermediate shaft (T) by screws.

10. A detection method of an electric vehicle three-electric integrated detection station based on the front and rear motor synchronous control as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Before the test, according to the wheelbase of the test vehicle, the wheelbase adjustment device (V) is used to move the bracket supporting the right rear wheel detection mechanism (III) and the left rear wheel detection mechanism (IV) forward and backward on the track (R), so that the distance between the front and rear wheel detection mechanisms is consistent with the wheelbase of the test vehicle; The front and rear lifting devices are in the lifting state, with the upper ends flush with the ground; the blocking device (N) is lowered to be consistent with the height of the rear active roller (K) and the rear driven roller (L), and the test vehicle is driven into the test bench; when the test vehicle enters the test bench and the front and rear wheels fall between the active and driven rollers, the blocking device (N) is raised to prevent the wheels from moving out of the test position during the test; the front and rear lifting devices are then lowered to place the wheels suspended between the active and driven rollers; During the test, the front wheel motor (D) and the rear wheel motor (Q) are synchronously controlled using a PID control algorithm. According to the performance test requirements of the test vehicle, under the corresponding test conditions, the load of the test vehicle when driving on the test bench under various road driving conditions is simulated, and the voltage, current, temperature of the single battery in the power battery pack and the SOC value of the battery pack are read. The performance status of the test vehicle's battery system, electric drive system and electronic control system is then evaluated.

Images