Flexible DC Transmission System and Method for Rickshaws

Abstract

The present invention provides a flexible DC drive system for a human-powered vehicle, which includes a power generation module capable of generating electricity, a drive motor connected to the power generation module, and an electronic speed control module capable of controlling the drive motor; the mechanical transmission structure in the existing human-powered vehicle is replaced by the provided power generation module and drive motor, and a fully enclosed sealing shell can be arranged outside the drive motor and the power generation device, which can effectively achieve the waterproof and dustproof of the drive motor and the power generation device, effectively reducing the maintenance frequency of the human-powered vehicle. At the same time, since the output is extremely unstable when a person controls the drive component to generate electricity, therefore, by the control method of the electronic speed controller for the drive motor, the duty ratio of the drive motor is limited to only two states of 0% and 100%, effectively avoiding the situation that the drive motor is burned out due to excessive current during the power generation process, and ensuring the normal operation of the drive motor during the riding process.

Description

Technical Field

[0001] The present invention relates to the technical field of rickshaw drive systems, and particularly to a flexible DC drive system and method for rickshaws. Background Art

[0002] Rickshaws are common means of transportation in modern society. Common rickshaws include two-wheel pedal bicycles, three-wheel pedal bicycles, assisted bicycles with a human-powered driving function, electric two-wheel or three-wheel vehicles with a human-powered driving function, etc. During the riding process, the rider needs to step on the mechanical transmission mechanism on the rickshaw to drive the rickshaw, thereby realizing the riding activity of the rider.

[0003] Most of the common mechanical transmission mechanisms on rickshaws are composed of pedals, sprockets, and drive chains. Since the sprocket and the drive chain are meshed, during long-term operation, slippage is likely to occur, and the transmission structure exposed to the outside is also prone to rust, resulting in an unsmooth transmission process. Therefore, it is necessary to regularly maintain the transmission structure, especially for those with mechanical gear shifting functions because of their more complex structures. There are certain inconveniences during use. Summary of the Invention

[0004] To solve the above problems, the present invention provides the following technical solutions:

[0005] A flexible DC drive system for a rickshaw, comprising:

[0006] A power generation module, which includes a power generation device provided on the rickshaw body and a drive assembly provided at the power generation input end of the power generation device. The drive assembly can drive the power generation input end of the power generation device to move, so as to prompt the power generation device to output electric energy;

[0007] A drive motor, whose input end is connected to the output end of the power generation device, and the output end of the drive motor can drive the rickshaw to move forward;

[0008] An electronic speed regulation module, which includes a monitoring unit for detecting the electric energy data of the power generation device and the drive motor, an execution unit capable of controlling the start and stop of the drive motor, and a processing unit provided in the power generation device for receiving the electrical signal of the monitoring unit and controlling the execution unit. The processing unit can control the rotation speed of the drive motor through the execution unit according to the electric energy output by the power generation device;

[0009] Sealing shells that wrap the power generation module and the drive motor are provided outside both of them, and the sealing shells are connected to the rickshaw body.

[0010] Based on the above technical solutions, the present invention can also be improved as follows.

[0011] Further, the power generation device outputs three-phase alternating current, and a rectification and filtering module is provided between the output end of the power generation device and the drive motor.

[0012] Further, a kinetic energy recovery module is provided inside the drive motor.

[0013] Further, the electronic speed regulation module is connected to an external power supply for supplying power to the entire electronic speed regulation module, and the external power supply is connected to the kinetic energy recovery module.

[0014] A flexible DC drive method for a rickshaw, characterized by comprising the following steps:

[0015] S1. The power generation device generates alternating current under the drive of the drive assembly and transmits it to the rectification and filtering module for rectification and filtering;

[0016] S2. The rectification and filtering module transmits the rectified and filtered direct current to the electronic speed regulation module;

[0017] S3. After the monitoring unit detects that the output electric energy of the rectification and filtering module meets the start standard, the processing unit in the electronic speed regulation module controls the execution unit to input the output electric energy into the drive motor to start the drive motor;

[0018] S4. After the electric energy input to the drive motor reaches the standard, the electronic speed regulation module keeps the duty ratio of the drive motor at 100%;

[0019] S5. Stop the active drive assembly, the power generation device no longer supplies electric energy to the drive motor, the drive motor continues to move under the inertial action of the whole rickshaw, and the kinetic energy recovery module recovers the electric energy generated inside the drive motor at this time and transmits it to the external power supply;

[0020] S6. When the whole rickshaw stops moving, the external power supply continues to supply power to the electronic speed regulation module, and the monitoring unit in the electronic speed regulation module monitors the output electric energy of the power generation device in real time. When the power generation device outputs electric energy, repeat steps S3 - S6.

[0021] On the basis of the above technical solutions, the present invention can also be improved as follows

[0022] Further, in step S3, when the rectification and filtering output electric energy standard is UG - UZ > US, the drive motor is started, where UG is the ideal value of the voltage rectified and output by the power generation device, UZ is the voltage drop of the rectification and filtering module, and US is the overall minimum drive voltage of the drive system.

[0023] Further, in step S4, the electronic speed control module adjusts the PWM of the drive motor to I*(RG + RM + RE) / (UG - UM - UZ), where I is the overall rated current of the transmission system, RG is the internal resistance of the power generation device, RM is the internal resistance of the drive motor, RE is the internal resistance of the electronic speed control module, and UM is the back electromotive force of the drive motor.

[0024] Further, in step S4, when (UG - UM - UZ) <= (RG + RM + RE)*I, the duty cycle of the drive motor driven by the electronic speed control module = 100%.

[0025] Further, when the duty cycle of the drive motor is 100%, IG = IM, where IG is the rectified output current of the brushless generator and IM is the current of the brushless motor.

[0026] Beneficial Effects

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] In the present invention, the provided power generation module and drive motor are used to replace the mechanical transmission structure in the existing rickshaw. When the driver activates the drive device, the power generation module can generate electric energy to drive the movement of the drive motor. A fully enclosed sealing housing can be arranged outside the power generation module and the drive motor, which can effectively achieve waterproof and dustproof functions for the drive motor and the power generation device, effectively reducing the maintenance frequency of the rickshaw. At the same time, since the output is extremely unstable when manpower controls the drive component for power generation, the control method of the drive motor by the electronic speed controller limits the duty cycle of the drive motor to only two states: 0% and 100%, effectively avoiding the situation of burning out the drive motor due to excessive current during power generation, and ensuring the normal operation of the drive motor during cycling. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is the structural block diagram of the flexible DC transmission system for rickshaws;

[0031] Figure 2 It is the flow block diagram of the flexible DC transmission method for rickshaws;

[0032] Figure 3 It is the side view structural schematic diagram of the power generation module;

[0033] Figure 4 Schematic diagram of the structure of the flexible DC drive system for a rickshaw when installed on a rickshaw;

[0034] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0035] 1. Power generation module; 101. Driving assembly; 102. Power generation device; 2. Driving motor; 3. External power supply; 4. Sealed housing. Detailed implementation manners

[0036] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant accompanying drawings. Several embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0037] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] It should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the technical product is usually placed during use. It is only for the convenience of describing the present technology and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present technology. In addition, "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Therefore, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0041] In addition, terms such as "horizontal", "vertical", "hanging", etc. do not mean that the component is required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0042] Please refer to Figures 1-4 , the present invention provides a flexible DC drive system for a rickshaw, including a power generation module 1 capable of generating electricity, a drive motor 2 connected to the power generation module 1, and an electronic speed control module capable of controlling the drive motor 2.

[0043] Among them, the power generation module 1 is a common power generation device 102, specifically including a power generation device 102 provided on the rickshaw body and a drive assembly 101 provided at the power generation input end of the power generation device 102. The drive assembly 101 can drive the power generation input end of the power generation device 102 to move, prompting the power generation device 102 to output electric energy. The power generation device 102 can be a common brushless generator, and the drive assembly 101 can be two common footrests and a connecting rod on the rickshaw. The connecting rod passes through the center of the brushless generator and fixes the two footrests on both sides of the rickshaw seat respectively.

[0044] The drive motor 2 can be a common brushless DC motor, its input end is connected to the output end of the power generation device 102, and the output end of the drive motor 2 is connected to the rear wheel axle of the rickshaw, capable of driving the rickshaw to move forward.

[0045] Specifically, to avoid the irregular output of the power generation device 102 from damaging the driving motor when manually stepping on the driving device, the electronic speed regulation module includes a monitoring unit for detecting the electrical energy data of the power generation device 102 and the driving motor 2, an execution unit capable of adjusting the duty cycle of the driving motor 2, and a processing unit disposed in the power generation device 102 to receive the electrical signal of the monitoring unit and control the execution unit. The electronic speed regulation module can control the duty cycle of the driving motor 2 and limit the duty cycle of the driving motor 2 to 100% when the input current to the driving motor 2 exceeds the rated current of the driving motor 2.

[0046] Considering the issue of power generation efficiency, the power generation device 102 is a brushless AC generator, and its output is three-phase alternating current. A rectification and filtering module is provided between the output end of the power generation device 102 and the driving motor 2. The rectification and filtering module can be installed on the vehicle body or together with the power generation device 102, and both are wrapped inside the sealed housing 4.

[0047] At the same time, to effectively achieve the overall low maintenance rate of the flexible DC drive system, sealed housings 4 that enclose both the power generation module 1 and the driving motor 2 are provided outside. The sealed housing 4 is connected to the rickshaw body. The sealed housing 4 can be a common three-proof housing, or other components in the flexible DC drive system can be arranged inside the sealed housing 4, effectively avoiding the influence of the external environment on each electronic device. To facilitate the heat dissipation of the electronic devices, heat dissipation fins can also be provided on the surface of the sealed housing 4 to improve the heat dissipation efficiency and avoid overheating and damaging related components in a closed environment.

[0048] To further improve the energy utilization efficiency, a kinetic energy recovery module is provided inside the driving motor 2. The kinetic energy recovery module is a common kinetic energy recovery device. When there is no longer electrical energy input to the driving motor 2, the electronic speed regulator uses the back electromotive force of the brushless motor for synchronous rectification and reversely outputs it to the power input terminal, and transports it to the kinetic energy recovery module for kinetic energy recovery. Also, to ensure that the electronic speed regulation module can smoothly perform its monitoring work even when there is no electrical energy input from the power generation module 1, the electronic speed regulation module is connected to an external power supply 3 that supplies power to the entire electronic speed regulation module. The external power supply 3 is connected to the kinetic energy recovery module. When kinetic energy is recovered, the external power supply 3 is charged for subsequent use.

[0049] To more clearly and elaborately illustrate the working process and principle of the present invention, a flexible DC drive method for a rickshaw is now disclosed, including the following steps:

[0050] S1. The power generation device 102 generates alternating current under the drive of the drive assembly 101 and transports it to the rectification and filtering module for rectification and filtering.

[0051] S2. The rectification and filtering module transports the rectified and filtered direct current to the electronic speed regulation module.

[0052] After the monitoring unit detects that UG - UZ > US, the processing unit in the electronic speed regulation module controls the execution unit to input the output electric energy into the drive motor 2, prompting the drive motor 2 to start.

[0053] Among them, UG is the ideal value of the voltage rectified and output by the power generation device 102, UZ is the voltage drop of the rectification and filtering module, and US is the overall minimum transmission voltage of the transmission system.

[0054] S4. When (UG - UM - UZ) > (RG + RM + RE) * I, the electronic speed regulation module can continuously collect Hall signals through the Hall sensor, continuously update the electrical phase data of the brushless motor, and update the on - off control state between the three phases of the brushless motor and the positive and negative poles of the power supply based on this, so as to continuously drive the brushless motor. At this time, the duty cycle of the drive motor 2 is I * (RG + RM + RE) / (UG - UM - UZ).

[0055] When the driver steps on the drive device so that the output power of the power generation device 102 enables the data detected by the electronic speed regulation module to satisfy (UG - UM - UZ) <= (RG + RM + RE) * I, the electronic speed regulation module controls the duty cycle of the drive motor 2 to be 100%. At this time, IG = IM. From this, it can be obtained that both IG and IM are in a completely linear proportional relationship with the torque of the brushless generator, and the torque of the brushless generator is in a completely linear proportional relationship with the torque of the brushless motor, and an effect similar to mechanical transmission can be achieved.

[0056] Among them, I is the overall rated current of the transmission system, RG is the internal resistance of the power generation device 102, RM is the internal resistance of the drive motor 2, RE is the internal resistance of the electronic speed regulation module, UM is the back - electromotive force of the drive motor 2, IG is the rectified output current of the brushless generator, and IM is the current of the brushless motor.

[0057] S5. Stop the active drive assembly 101. The power generation device 102 no longer supplies electric energy to the drive motor 2. The drive motor 2 continues to move under the inertial action of the rickshaw as a whole. The kinetic energy recovery module recovers the electric energy generated inside the drive motor 2 at this time and transports it to the external power supply 3.

[0058] S6. When the rickshaw as a whole stops moving, the external power supply 3 continues to supply power to the electronic speed regulation module. The monitoring unit in the electronic speed regulation module monitors the output electric energy of the power generation device 102 in real - time. When the power generation device 102 outputs electric energy, repeat steps S3 - S6.

[0059] In the description of the present technology, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present technology can be understood according to specific circumstances.

[0060] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered by the protection scope of the present invention.

Claims

1. A flexible DC drive system for a rickshaw, characterized in that, Comprising: A power generation module (1), which includes a power generation device (102) provided on the rickshaw body and a drive assembly (101) provided at the power generation input end of the power generation device (102). The drive assembly (101) can drive the power generation input end of the power generation device (102) to move, so as to prompt the power generation device (102) to output electric energy; A drive motor (2), whose input end is connected to the output end of the power generation device (102), and the output end of the drive motor (2) can drive the rickshaw to move forward; An electronic speed regulation module, which includes a monitoring unit for detecting the electric energy data of the power generation device (102) and the drive motor (2), an execution unit capable of adjusting the duty ratio of the drive motor (2), and a processing unit provided in the power generation device (102) for receiving the electrical signal of the monitoring unit and controlling the execution unit. The electronic speed regulation module can control the duty ratio of the drive motor (2) and limit the duty ratio of the drive motor (2) to 100% when the input current of the drive motor (2) is greater than or equal to the rated current of the drive motor (2); Both the outside of the power generation module (1) and the drive motor (2) are provided with a sealed housing (4) that wraps them inside, and the sealed housing (4) is connected to the rickshaw body.

2. The flexible DC drive system for a rickshaw according to claim 1, wherein: The output of the power generation device (102) is three-phase alternating current, and a rectification and filtering module is provided between the output end of the power generation device (102) and the drive motor (2).

3. The flexible DC drive system for a rickshaw according to claim 2, characterized in that: A kinetic energy recovery module is provided inside the drive motor (2).

4. The flexible DC drive system for a rickshaw according to claim 3, characterized in that: The electronic speed regulation module is connected to an external power supply (3) that supplies power to the entire electronic speed regulation module, and the external power supply (3) is connected to the kinetic energy recovery module.

5. Flexible DC drive method for rickshaws, characterized in that: Including the following steps: S1. The power generation device (102) generates alternating current under the drive of the drive assembly (101) and transports it to the rectification and filtering module for rectification and filtering; S2. The rectification and filtering module transports the rectified and filtered direct current to the electronic speed regulation module; S3. After the monitoring unit detects that the output electric energy of the rectification and filtering module meets the start standard, the processing unit in the electronic speed regulation module controls the execution unit to input the output electric energy into the drive motor (2), so as to prompt the drive motor (2) to start; S4. After the electric energy input into the drive motor (2) reaches the standard, the electronic speed regulation module keeps the duty ratio of the drive motor (2) at 100%; S5. Stop the drive assembly (101) from moving, the power generation device (102) no longer supplies electric energy to the drive motor (2), the drive motor (2) continues to move under the inertial action of the whole rickshaw, and the kinetic energy recovery module recovers the electric energy generated inside the drive motor (2) at this time and transports it to the external power supply (3); S6. When the whole rickshaw stops moving, the external power supply (3) continues to supply power to the electronic speed regulation module. The monitoring unit in the electronic speed regulation module monitors the output electric energy of the power generation device (102) in real time. When the power generation device (102) outputs electric energy, repeat steps S3 - S6.

6. The flexible DC drive method for a rickshaw according to claim 5, wherein: In step S3, the rectification and filtering output electric energy standard is to start the drive motor (2) when UG - UZ > US, where UG is the ideal value of the rectified output voltage of the power generation device (102), UZ is the voltage drop of the rectification and filtering module, and US is the overall minimum transmission voltage of the transmission system.

7. The flexible DC drive method for a rickshaw according to claim 5, characterized in that: In the step S4, when (UG - UM - UZ) > (RG + RM + RE) * I, the electronic speed control module adjusts the duty ratio of the drive motor (2) to I * (RG + RM + RE) / (UG - UM - UZ), where I is the overall rated current of the drive system, RG is the internal resistance of the power generation device (102), RM is the internal resistance of the drive motor (2), RE is the internal resistance of the electronic speed control module, and UM is the back electromotive force of the drive motor (2).

8. The flexible DC drive method for a rickshaw according to claim 7, characterized in that: In the step S4, when (UG - UM - UZ) <= (RG + RM + RE) * I, the duty ratio of the drive motor (2) driven by the electronic speed control module is 100%.

9. The flexible DC drive method for a rickshaw according to claim 8, characterized in that: When the duty ratio of the drive motor (2) is 100%, IG = IM, where IG is the rectified output current of the brushless generator and IM is the current of the brushless motor.

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