Electric cross-country motorcycle three-electric system matching test device and method

Abstract

The invention discloses an electric cross-country motorcycle three-electric system matching test device and method, and the device comprises a switching wheel system and six load wheel systems which are uniformly distributed at the periphery of the switching wheel system. The six load wheel systems correspond to the asphalt road condition, the cement road condition, the jungle soil road condition, the riprap road condition, the cannonball pit road condition and the wet and slippery low adhesion road condition respectively, and a fixing support is arranged on a rear wheel of the motorcycle, so that the wheel face of the rear wheel of the motorcycle is attached to one of the load wheel systems. The different load wheel systems are switched through the switching wheel system to achieve the working condition of the electric cross-country motorcycle flying and jumping platform, the three-electric system is matched by switching the simulation motorcycle under different road conditions and the working condition of the electric cross-country motorcycle flying and jumping platform, and matching and testing conditions and method technical references are provided for the electric cross-country motorcycle. Safety guarantee is improved, matching test time is shortened, and actual test performance parameters are obtained.

Description

Technical Field

[0001] The present invention relates to the field of electric motorcycles, and in particular to a device and method for testing the matching of three-electric systems of an electric off-road motorcycle. Background Art

[0002] With the development of new energy automobile and motorcycle technology, electric motorcycles are becoming more and more diversified. In the past two years, electric off-road motorcycles have gradually emerged. However, since the operating conditions of electric off-road motorcycles are relatively complex, and as the power gradually increases, the terrain they can adapt to will also become more complex. How to match and test the three-electric system under complex working conditions has become the biggest problem for electric off-road motorcycles. At present, the industry is based on conventional electric motorcycle technology and methods for matching tests, and then professional riders drive the vehicles on various road conditions in the field and wild mountains and forests to collect data, make matching adjustments and test and verify. The current matching test method has safety hazards, complex matching test procedures, and long time consumption. Summary of the invention

[0003] In view of the shortcomings of the above-mentioned prior art, the present invention provides an electric off-road motorcycle three-electric system matching test device, which explains and analyzes the torque, speed and current changes of the electric off-road motorcycle corresponding to different road conditions, simulates the operating conditions of the whole vehicle, improves safety, and solves problems such as complex procedures and long time consumption.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] 1. A three-electric system matching test device for an electric off-road motorcycle, characterized in that it includes a switching wheel system and a load wheel system, the load wheel systems are six and evenly distributed on the periphery of the switching wheel system, the six load wheel systems respectively correspond to asphalt road conditions, cement road conditions, jungle mud road conditions, rubble road conditions, shell crater road conditions, and slippery low-adhesion road conditions, a fixed bracket is provided on the rear wheel of the motorcycle so that the rear wheel surface of the motorcycle fits with one of the load wheel systems, and the working condition of the electric off-road motorcycle flying jump platform is realized by switching different load wheel systems through the switching wheel system.

[0006] 2. The three-electric system matching test device of an electric off-road motorcycle according to claim 1, characterized in that the load wheel system has a drive controller.

[0007] 3. A method for testing the matching of three-electric systems of an electric off-road motorcycle, characterized in that it comprises the following steps:

[0008] The torque, speed and power of the rear wheel of the electric off-road motorcycle corresponding to the current road conditions are calculated according to the load wheel system, namely:

[0009] T 车 ×R1=T负载轮 ×R2 (1)

[0010] n 车 ×R1=n 负载轮 ×R2 (2)

[0011] It can be concluded that

[0012]

[0013] P=T 负载轮 ·n 负载轮 / 9550 (5)

[0014] Where T 车 is the torque of the rear wheel of the electric off-road motorcycle, T 负载轮 is the torque of the current load wheel system, R1 is the radius of the rear wheel of the electric off-road motorcycle, R2 is the radius of the load wheel corresponding to the current load wheel system, n 车 is the speed of the rear wheel of the electric off-road motorcycle, n 负载轮 is the speed of the load wheel corresponding to the current load wheel system, V 车 is the speed of the electric off-road motorcycle, and P is the power of the electric off-road motorcycle;

[0015] Under the flying platform condition:

[0016] Assume that the frontal area of ​​the electric off-road motorcycle is A, and the rolling friction coefficient is f; if the wind resistance during the ascent and landing is ignored, the flight angle is θ, and the take-off speed is V 车1 , we can get the flying height h, rising time t1, falling time t2, and landing vehicle speed V 落地 ;

[0017]

[0018]

[0019] t=t1+t2=2t1 (8)

[0020] Assume that the switching wheel rotates at a speed n 切换轮 , when switching the next load wheel, the switching wheel needs to rotate 60°, that is, 1 / 6 turn, and its speed should be:

[0021]

[0022]

[0023]

[0024] In formula (10), V 落地1 is the horizontal speed of the electric off-road motorcycle at the moment of landing, V落地2 is the vertical speed of the electric off-road motorcycle at the moment of landing, and g is the acceleration due to gravity;

[0025] During the leap, the sudden unloading after the vehicle is in the air will cause the rear wheel speed to increase suddenly. Since the driver will control the rear wheel speed by accelerator and brake, this factor is taken into account in the vehicle drive controller matching test. This device regards the vehicle as a whole, and its landing speed is:

[0026]

[0027] In formula (12), F 风 is the wind resistance, M is the initial inertia of the electric off-road motorcycle and the driver, C D is the air resistance coefficient, and the motorcycle drag coefficient is usually 0.64.

[0028] Therefore, the moment of inertia load of the next load wheel system at the moment of landing should be the sum of the initial inertia M of the electric off-road motorcycle and the driver, and the work done to overcome the wind resistance and rolling resistance during take-off. If the total moment of inertia of the load wheel is set to M1 at this time, the force is F = M1g, and the absolute value of the gravity work and the gravitational potential energy are equal, E P =Mgh=F M h can be obtained:

[0029]

[0030] In formula (13), F W is the air resistance, F f is the rolling resistance,

[0031] Therefore, at the moment of landing, that is, when the load wheel 2 reaches the predetermined position, the load wheel 2 driving controller controls the output according to the rotational inertia of M1, and when it is stable, it switches to M for output;

[0032] During the matching process, the vehicle drive controller responds to the torque caused by the leap, the output and feedback current mutations caused by the sudden change in speed, and adjusts the current size, FOC output or shuts down control based on the maximum allowable discharge or feedback current parameters obtained by interacting with the power battery and the state of the electric drive itself.

[0033] The beneficial effects of the present invention include: making up for the deficiencies of existing dynamometer and electric off-road motorcycle matching and testing technologies, providing a technical reference for matching and testing conditions and methods for electric off-road motorcycles, improving safety assurance, shortening matching test time, and obtaining actual test performance parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention.

[0035] Figure 2It is the control logic diagram of the present invention.

[0036] Figure 3 It is a schematic diagram of the leap of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0038] This device Figure 1 As shown in the figure, it is mainly composed of 6 load wheel systems and 1 road condition switching wheel system. The 6 load wheels are evenly distributed around the switching wheel in a circle. The switching wheel rotates according to the set road conditions to switch the test vehicle between loaded-unloaded-loaded to simulate the flying jump-landing condition, and test under various road conditions. Load wheels No. 1 and No. 2 are asphalt / cement roads, and the corresponding flying jump platform is rotated by the switching wheel; No. 3 is an irregular dirt road in the jungle; No. 4 is a pile of rocks; No. 5 is a shell pit road, and No. 6 is a slippery low-adhesion road.

[0039] Figure 1 The device shown in the figure adds a fixing device to the rear wheel of the electric off-road motorcycle, and adapts to different rear wheel sizes through the slider adjustment, which can solve the problems of the electric off-road motorcycle's torque and acceleration being too large to accurately test the acceleration performance and climbing.

[0040] The load wheel system is similar to the existing dynamometer load inertia driven wheel. On this basis, a reversing switching device is added to move the load wheel so that the tested vehicle can be loaded or unloaded instantly, simulating the sudden change of flying and landing. The force is mutual and the mileage is the same, that is:

[0041] T 车 ×R1=T 负载轮 ×R2 (1)

[0042] n 车 ×R1=n 负载轮 ×R2 (2)

[0043] The current torque, speed and power of the vehicle's rear wheels can be obtained

[0044]

[0045] P=T 负载轮 ·n 负载轮 / 9550 (5)

[0046] Conventional working condition testing is consistent with the current chassis dynamometer. When simulating complex working conditions of electric off-road motorcycles, it is necessary to switch the wheel and other load wheels. The detailed process is as follows: Figure 2Taking the flying platform working condition as an example, that is, simulating the scene of an electric off-road motorcycle flying into the air and landing, the load wheel 1 sets the initial moment of inertia M according to the curb weight of the electric off-road motorcycle + 75kg, and the load wheel 1 drive controller controls the corresponding output according to the moment of inertia value, and collects the corresponding speed n 负载轮1 , torque T 负载轮1 If it does not meet the set value, the load wheel 1 drive controller performs PID adjustment according to the real-time feedback value; if it meets the value, it will continue to run. According to the set working conditions, when the load wheel needs to be switched when entering the leap, the flight time and the switching wheel speed are calculated according to the set working conditions, and then the switching wheel drive controller controls the output according to the required speed.

[0047] like Figure 3 As shown, the frontal area of ​​the electric off-road motorcycle is A, and the rolling friction coefficient is f; if the rising and landing wind resistance is ignored, the leap angle is θ, and the take-off speed is V 车1 , we can get the flying height h, rising time t1, falling time t2, and landing vehicle speed V 落地 wait.

[0048]

[0049] t=t1+t2=2t1 (8)

[0050] Assume that the switching wheel rotates at a speed n 切换轮 , when switching the next load wheel, the switching wheel needs to rotate 60°, that is, 1 / 6 turn, and its speed should be:

[0051]

[0052]

[0053]

[0054] During the leap, the sudden unloading after the vehicle is in the air will cause the rear wheel speed to increase suddenly. Since the driver will control the rear wheel speed by accelerator and brake, this factor is taken into account in the vehicle drive controller matching test. This device regards the vehicle as a whole, and its landing speed is:

[0055]

[0056] Therefore, the moment of inertia load of the load wheel 2 at the moment of landing should be the sum of the initial inertia M of the electric off-road motorcycle and the driver, and the force of overcoming wind resistance and rolling resistance during take-off. If the total moment of inertia of the load wheel is set to M1 at this time, the force is F = M1g, and the absolute value of the gravity work and the gravitational potential energy are equal, E P =Mgh=F M h can be obtained:

[0057]

[0058] Therefore, at the moment of landing, that is, when the load wheel 2 reaches the predetermined position, the load wheel 2 driving controller controls the output according to the rotational inertia of M1, and switches to M for output when it is stable.

[0059] During the matching process, the vehicle drive controller responds to the torque caused by the leap, the output and feedback current mutations caused by the sudden change in speed, and adjusts the current size and FOC output / shutdown control based on the maximum allowable discharge / feedback current parameters obtained by interacting with the power battery and the electric drive's own state.

[0060] The control logic of the present invention is as follows Figure 2 As shown, first, the load wheel 1 drive controller controls the speed and torque of the load wheel 1, and determines whether the current load speed and torque meet the set working conditions. If not, it is fed back to the load wheel 1 drive controller to further adjust the speed and torque; if so, it enters the next step to determine whether the working condition requires switching the load wheel, if not, it is fed back to the load wheel 1 drive controller, if so, the drive controller is switched, and then the corresponding speed is output according to the set working condition, and then the load wheel system is switched; at the same time, the moment of inertia of the load wheel system is output according to the set working condition, the load wheel 2 drive controller is activated, the current speed and torque of the load wheel 2 are controlled, and the data is transmitted to the vehicle drive controller of the motorcycle, the vehicle drive controller outputs the phase line current and the bus current to drive the vehicle motor, the vehicle drive motor feeds back the feedback current to the vehicle drive controller, and determines whether the feedback current is less than or equal to the maximum allowable feedback current of the battery, if not, it is only used to drive the vehicle motor, if so, the battery management module monitors the maximum allowable discharge current, the maximum allowable charge or feedback current, the battery voltage or SOC (remaining power). The vehicle drive motor controls the rear wheel to match the motor output according to the equality of the action force and the reaction force and the equality of the linear speed.

[0061] In summary, the present invention provides a new solution reference and idea for the matching and testing technology of electric off-road motorcycles, solves the potential safety hazard to drivers caused by the unstable performance of the electric drive system during the matching and testing process, and is currently the only research direction for matching and testing while ensuring safety.

[0062] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A three-electric system matching test device for an electric off-road motorcycle, characterized in that: It includes a switching wheel system and a load wheel system. There are six load wheel systems that are evenly distributed on the periphery of the switching wheel system. The six load wheel systems correspond to asphalt road conditions, cement road conditions, jungle mud road conditions, rock pile road conditions, shell crater road conditions, and slippery low-adhesion road conditions, respectively. A fixed bracket is provided on the rear wheel of the motorcycle so that the rear wheel surface of the motorcycle fits with one of the load wheel systems. The working condition of the electric off-road motorcycle flying jump platform is realized by switching different load wheel systems through the switching wheel system.

2. The three-electric system matching test device of an electric off-road motorcycle according to claim 1, characterized in that: The load wheel system has a drive controller.

3. A method for testing the matching of three-electric systems of an electric off-road motorcycle, characterized in that: The following steps are included: The torque, speed and power of the rear wheel of the electric off-road motorcycle corresponding to the current road conditions are calculated according to the load wheel system, namely: T 车 ×R1=T 负载轮 ×R2 (1) n 车 ×R1=n 负载轮 ×R2 (2) It can be concluded that P=T 负载轮 ·n 负载轮 / 9550 (5) Where T 车 is the torque of the rear wheel of the electric off-road motorcycle, T 负载轮 is the torque of the current load wheel system, R1 is the radius of the rear wheel of the electric off-road motorcycle, R2 is the radius of the load wheel corresponding to the current load wheel system, n 车 is the speed of the rear wheel of the electric off-road motorcycle, n 负载轮 is the speed of the load wheel corresponding to the current load wheel system, V 车 is the speed of the electric off-road motorcycle, and P is the power of the electric off-road motorcycle; Under the flying platform condition: Assume that the frontal area of ​​the electric off-road motorcycle is A, and the rolling friction coefficient is f; if the wind resistance during the ascent and landing is ignored, the flight angle is θ, and the take-off speed is V 车1 , we can get the flying height h, rising time t1, falling time t2, and landing vehicle speed V 落地 ; t=t1+t2=2t1 (8) Assume that the switching wheel rotates at a speed n 切换轮 , when switching the next load wheel, the switching wheel needs to rotate 60°, that is, 1 / 6 turn, and its speed should be: In formula (10), V 落地1 is the horizontal speed of the electric off-road motorcycle at the moment of landing, V 落地2 is the vertical speed of the electric off-road motorcycle at the moment of landing, and g is the acceleration due to gravity; During the leap, the sudden unloading after the vehicle is in the air will cause the rear wheel speed to increase suddenly. Since the driver will control the rear wheel speed by accelerator and brake, this factor is taken into account in the vehicle drive controller matching test. This device regards the vehicle as a whole, and its landing speed is: In formula (12), F 风 is the wind resistance, M is the initial inertia of the electric off-road motorcycle and the driver, C D is the air resistance coefficient, usually taken as 0.64; Therefore, the moment of inertia load of the next load wheel system at the moment of landing should be the sum of the initial inertia M of the electric off-road motorcycle and the driver, and the work done to overcome the wind resistance and rolling resistance during take-off. If the total moment of inertia of the load wheel is set to M1 at this time, the force is F = M1g, and the absolute value of the gravity work and the gravitational potential energy are equal, E P =Mgh=F M h,F M is the vertical force on the car and the driver, we can get: In formula (13), F W is the air resistance, F f is the rolling resistance; Therefore, at the moment of landing, that is, when the load wheel 2 reaches the predetermined position, the load wheel 2 driving controller controls the output according to the rotational inertia of M1, and when it is stable, it switches to M for output; During the matching process, the vehicle drive controller responds to the torque caused by the leap, the output and feedback current mutations caused by the sudden change in speed, and adjusts the current size, FOC output or shuts down control based on the maximum allowable discharge or feedback current parameters obtained by interacting with the power battery and the state of the electric drive itself.

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