Method for testing vehicle speed limit current and power-off vehicle speed of electric power-assisted bicycle

Abstract

The invention discloses an electric power-assisted bicycle speed limit current and power-off speed testing method, which comprises the following steps of: firstly, fixing an electric power-assisted bicycle, and then measuring a torque-free output current value; then, at least one of the following four driving methods is used for driving the electric power-assisted bicycle: the first driving method is that the electric power-assisted bicycle is accelerated to exceed the limit vehicle speed through riding of a driver; according to the second driving method, the crankset is driven by the external motor to accelerate the electric power-assisted bicycle to the speed exceeding the limiting value. The third driving method comprises the steps of simulating an output signal of the sensor, and meanwhile driving the electric power-assisted bicycle to accelerate to exceed the limited speed through the rotary drum or the conveying belt. The fourth driving method comprises the steps that a crank is driven by hand cranking or an external motor to accelerate the electric power-assisted bicycle to the speed exceeding the limiting value. And the working current and the vehicle speed are measured and recorded in the driving process. According to the invention, the vehicle speed limit current and the power-off vehicle speed of the electric power-assisted bicycle can be measured more comprehensively, so that the measurement result is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of detection of electric-assisted bicycles, and in particular relates to a method for testing a speed limit current and a power-off speed of an electric-assisted bicycle. Background Art

[0002] GB 17761-2018 stipulates that the maximum speed of electric-assisted bicycles must be tested, requiring that when the speed exceeds 25km / h during the use of the electric-assisted function, the motor will not provide power output. This also involves testing the speed limit current and power-off speed of electric-assisted bicycles.

[0003] However, the test methods recorded in the standard are relatively simple, and fail to classify the driving methods of electric-assisted bicycles, especially fail to classify the different sensor types. For example, the sensors used in electric-assisted bicycles usually include torque sensors, pedaling frequency / speed sensors, etc., and different sensors require different methods to start. At the same time, the standard does not provide detailed operating methods for speed limit current and power-off speed tests. Moreover, the operating process of the test methods recorded in the standard uses manual pedaling, which is time-consuming and labor-intensive, the pedaling speed is unstable, and data collection and processing are difficult. Summary of the invention

[0004] The purpose of the present invention is to provide a method for testing the speed limit current and power-off speed of an electric-assisted bicycle, which better realizes the testing of the speed limit current and power-off speed of an electric-assisted bicycle.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for testing a speed limit current and a power-off speed of an electric-assisted bicycle, characterized in that it comprises the following steps:

[0007] S1, fixing the electric-assisted bicycle and making the driving wheel of the electric-assisted bicycle contact with a rotating drum or a conveyor belt;

[0008] S2, measuring and obtaining the torque-free output current value of the electric-assisted bicycle;

[0009] S3, driving the electric bicycle using at least one of the following four driving methods:

[0010] The first driving method is: adding a set load to the drum or conveyor belt, the driver balances the weight according to the regulations, and the driver rides the electric power-assisted bicycle to steadily accelerate the electric power-assisted bicycle to a speed exceeding the limit;

[0011] The second driving method is: adding a set load to the drum or conveyor belt, loading a set weight on the electric-assisted bicycle, driving the chainring of the electric-assisted bicycle to rotate through an external motor, and accelerating the electric-assisted bicycle to a speed exceeding the limit;

[0012] The third driving method is: a weight of a set weight is loaded on the electric-assisted bicycle, an output signal of a sensor is simulated by an external signal generating simulation device, and the signal is output to a corresponding sensor signal input terminal of a controller of the electric-assisted bicycle, and at the same time, a driving wheel of the electric-assisted bicycle is driven to accelerate through a rotating drum or a conveyor belt until the speed exceeds the limit value;

[0013] The fourth driving method is: a weight of a set weight is loaded on the electric-assisted bicycle, and the crank of the electric-assisted bicycle is driven by hand or an external motor to accelerate the electric-assisted bicycle to a speed exceeding the limit;

[0014] In the process of driving the electric-assisted bicycle by the driving method, the input current value of the controller of the electric-assisted bicycle is measured and recorded as the working current, and the linear speed of the drum or the conveyor belt is measured and recorded as the vehicle speed; when the vehicle speed reaches the limit speed, the working current is the vehicle speed limit current, and when the working current first reaches the no-torque output current value, the vehicle speed is the power-off speed.

[0015] A further technical solution of the present invention is: in step S2, the measurement process of the torque-free output current value is: the drum or the conveyor belt of the treadmill is in a no-load state, the electric-assisted bicycle is started to the normal electric-assisted mode, and the input current value of the controller of the electric-assisted bicycle is measured as the torque-free output current value.

[0016] A further technical solution of the present invention is: before testing, the electric-assisted bicycle needs to be assembled according to standard regulations, the tires of the electric-assisted bicycle need to be inflated, and the electric-assisted bicycle needs to be charged.

[0017] A further technical solution of the present invention is: before testing, the electric-assisted bicycle is directly fully charged, or when the electric-assisted bicycle is charged, the battery voltage of the electric-assisted bicycle is measured until it reaches a specified range.

[0018] A further technical solution of the present invention is: before testing, determining the type of sensor for the position of the middle axis of the electric power-assisted bicycle connected to the crankset and determining the type of output signal of the sensor.

[0019] A further technical solution of the present invention is: in step S1, when only one wheel of the electric-assisted bicycle is a driving wheel, the driving wheel is contacted with the rotating drum and the other wheel is fixed; when both wheels of the electric-assisted bicycle are driving wheels, the two driving wheels are respectively contacted with two rotating drums arranged side by side, or the two driving wheels are contacted with the same conveyor belt.

[0020] A further technical solution of the present invention is: the speed limit is 25 km / h.

[0021] A further technical solution of the present invention is: in the first driving method, the overall weight of the driver after counterweight is 75 kg, and in the second to fourth driving methods, the weight of the heavy object loaded on the electric assisted bicycle is 75 kg.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention realizes the test of the speed limit current and the power-off speed of an electric-assisted bicycle, and provides four driving modes. Different driving methods can be measured according to the sensor type of the electric-assisted bicycle, so that the speed limit current and the power-off speed of the electric-assisted bicycle can be measured more comprehensively, making the measurement result more accurate. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with embodiments.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientation or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] Example:

[0029] Before testing the electric-assisted bicycle speed limit current and power-off speed test method of this embodiment, the electric-assisted bicycle needs to be assembled in accordance with the standard provisions and the instructions, and the tires of the electric-assisted bicycle need to be inflated in accordance with the standard provisions and the markings on the side of the tires, and the electric-assisted bicycle needs to be charged in accordance with the standard provisions. When charging the electric-assisted bicycle, fully charge or measure the battery voltage of the electric-assisted bicycle until it reaches the specified range. The battery voltage range will vary depending on the electric-assisted bicycle. For a 48V electric-assisted bicycle, the required value is generally around 52V, and for a 36V electric-assisted bicycle, the required value is generally around 42V.

[0030] After charging is completed, testing needs to be carried out within the specified time, and the movement of the electric assisted bicycle cannot use the energy of the battery, and the energy recovery function of the electric assisted bicycle will not be activated.

[0031] At the same time, before testing, it is also necessary to determine the sensor type of the middle axis position connected to the chainring of the electric-assisted bicycle and the output signal type of the sensor. The general sensor types include torque sensors and cadence / speed sensors. The torque sensor needs to apply torque to the middle axis to start, and the cadence / speed sensor can start by rotating the chainring. The sensor can refresh the firmware to the signal normal output state. The output signal type of the sensor can also be determined by using a signal acquisition device to collect signals, and used for signal generation simulation devices to simulate signals.

[0032] After the above preparations are completed, the test can be carried out. The electric power-assisted bicycle speed limit current and power-off speed test method of this embodiment includes the following steps:

[0033] S1, fix the electric-assisted bicycle and make the driving wheel of the electric-assisted bicycle contact with a rotating drum or a conveyor belt. Specifically: when only one wheel of the electric-assisted bicycle is a driving wheel, make the driving wheel contact with the rotating drum and fix the other wheel; when both wheels of the electric-assisted bicycle are driving wheels, make the two driving wheels contact with two rotating drums arranged side by side respectively, or make the two driving wheels contact with the same conveyor belt, which can be a conveyor belt of a treadmill. For fixing the electric-assisted bicycle, a conventional fixing frame can be used to fix it at a single point or multiple points to prevent it from slipping.

[0034] S2, measuring and obtaining the torque-free output current value of the electric-assisted bicycle. The specific process is: the drum or the conveyor belt of the treadmill is in an unloaded state, the electric-assisted bicycle is not placed with any heavy objects, and is also unloaded, the electric-assisted bicycle is started to the normal electric-assisted mode, and the input current value of the controller of the electric-assisted bicycle is measured as the torque-free output current value.

[0035] S3, driving the electric bicycle using at least one of the following four driving methods:

[0036] The first driving method is: adding a set load to the drum or the conveyor belt, the driver balances the weight according to the regulations, the overall weight after the driver balances the weight is 75 kg, the driver rides the electric-assisted bicycle in a normal riding manner, steadily accelerates the electric-assisted bicycle, and accelerates the electric-assisted bicycle to a speed exceeding the limit;

[0037] The second driving method is: adding a set load to the drum or conveyor belt, and the load is added in a conventional manner, that is, increasing the drag resistance, loading a set weight on the electric power-assisted bicycle, setting an external motor, connecting the output shaft of the external motor to the chainring through a conventional coupling, universal joint, clamp or chain, etc., driving the chainring to rotate through the external motor, accelerating the electric power-assisted bicycle at a stable speed, and finally accelerating the electric power-assisted bicycle to a speed exceeding the limit;

[0038] The third driving method is: a weight of a set weight is loaded on the electric-assisted bicycle, an output signal of a sensor is simulated by an external signal generating simulation device, and the signal is output to a corresponding sensor signal input terminal of a controller of the electric-assisted bicycle, and at the same time, a driving wheel of the electric-assisted bicycle is driven to accelerate through a rotating drum or a conveyor belt until the speed exceeds the limit value;

[0039] The fourth driving method is: a weight of a set weight is loaded on the electric-assisted bicycle, and the crank of the electric-assisted bicycle is driven by a constant-speed hand crank or an external motor to accelerate the electric-assisted bicycle to a speed exceeding the limit;

[0040] In the process of driving the electric-assisted bicycle by the above-mentioned driving method, the input current value of the controller of the electric-assisted bicycle is measured and recorded as the working current, and the linear speed of the drum or conveyor belt is measured and recorded as the vehicle speed. When the vehicle speed reaches the limit speed, the working current is the vehicle speed limit current, and when the working current reaches the torque-free output current value for the first time, the vehicle speed is the power-off speed. Specifically, the results can be obtained through the curve graph of the working current and time and the curve graph of the vehicle speed and time. Among them, the value of the speed limit current should not be greater than the value of the torque-free output current.

[0041] In the above driving method, a method of loading a weight of a set weight onto the electric-assisted bicycle is generally to fix a 75kg weight bag on the saddle of the electric-assisted bicycle.

[0042] The limited vehicle speed in the above driving method is 25km / h.

[0043] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for testing speed limit current and power-off speed of an electric-assisted bicycle, characterized in that: The following steps are involved: S1, fixing the electric-assisted bicycle and making the driving wheel of the electric-assisted bicycle contact with a rotating drum or a conveyor belt; S2, measuring and obtaining the torque-free output current value of the electric-assisted bicycle; S3, driving the electric bicycle using at least one of the following four driving methods: The first driving method is: adding a set load to the drum or the conveyor belt, the driver balances the weight according to the regulations, and the driver rides the electric power-assisted bicycle to stably accelerate the electric power-assisted bicycle to a speed exceeding the limit; The second driving method is: adding a set load to the drum or the conveyor belt, loading a weight of a set weight on the electric-assisted bicycle, driving the chainring of the electric-assisted bicycle to rotate through an external motor, and accelerating the electric-assisted bicycle to a speed exceeding a limit; The third driving method is: a weight of a set weight is loaded on the electric-assisted bicycle, an output signal of a sensor is simulated by an external signal generating simulation device, and the signal is output to a corresponding sensor signal input terminal of a controller of the electric-assisted bicycle, and at the same time, the driving wheel of the electric-assisted bicycle is driven to accelerate through the rotating drum or the conveyor belt until the speed exceeds the limit value; The fourth driving method is: a weight of a set weight is loaded on the electric-assisted bicycle, and a crank of the electric-assisted bicycle is driven by hand or an external motor to accelerate the electric-assisted bicycle to a speed exceeding a limit; In the process of driving the electric-assisted bicycle by the driving method, the input current value of the controller of the electric-assisted bicycle is measured and recorded as the working current, and the linear speed of the drum or the conveyor belt is measured and recorded as the vehicle speed; when the vehicle speed reaches the limit speed, the working current is the vehicle speed limit current, and when the working current first reaches the no-torque output current value, the vehicle speed is the power-off speed.

2. The electric power-assisted bicycle speed limit current and power-off speed testing method according to claim 1, characterized in that: In step S2, the measurement process of the torque-free output current value is as follows: the drum or the conveyor belt of the treadmill is in an unloaded state, the electric-assisted bicycle is started to a normal electric-assisted mode, and the input current value of the controller of the electric-assisted bicycle is measured as the torque-free output current value.

3. The method for testing the speed limit current and power-off speed of an electric-assisted bicycle according to claim 1, characterized in that: Before testing, the electric-assisted bicycle needs to be assembled in accordance with standard regulations, the tires of the electric-assisted bicycle need to be inflated, and the electric-assisted bicycle needs to be charged.

4. The method for testing the speed limit current and power-off speed of an electric-assisted bicycle according to claim 3, characterized in that: Before the test, the electric-assisted bicycle is directly fully charged, or when the electric-assisted bicycle is charged, the battery voltage of the electric-assisted bicycle is measured until it reaches a specified range.

5. The method for testing the speed limit current and power-off speed of an electric-assisted bicycle according to claim 1, characterized in that: Before testing, determine the type of sensor for the position of the middle shaft of the electric-assisted bicycle connected to the crankset and determine the type of the output signal of the sensor.

6. The method for testing the speed limit current and power-off speed of an electric-assisted bicycle according to claim 1, characterized in that: In step S1, when only one wheel of the electric-assisted bicycle is a driving wheel, the driving wheel is contacted with a rotating drum and the other wheel is fixed; when both wheels of the electric-assisted bicycle are driving wheels, the two driving wheels are respectively contacted with two rotating drums arranged side by side, or the two driving wheels are contacted with the same conveyor belt.

7. The method for testing the speed limit current and power-off speed of an electric-assisted bicycle according to claim 1, characterized in that: The limit speed is 25km / h.

8. The method for testing the speed limit current and power-off speed of an electric-assisted bicycle according to claim 1, characterized in that: In the first driving method, the overall weight of the driver after counterweight is 75 kg, and in the second to fourth driving methods, the weight of the weight loaded on the electric assisted bicycle is 75 kg.