CN2462356Y - Automatic detecting device of electric booster bicycle - Google Patents

Abstract

The utility model relates to an automatic detecting device of an electric booster bicycle, which is especially used for detecting pedal force, speed and steering direction without having a contact. The utility model is composed of an inner wheel plate 8, an outer wheel plate 7, an outer stop plate 9, screws 10, a clamping ring 12, an inner stop plate 11, pins 13, and a spring 14, and is characterized in that a bracket 3 is fixed on a sleeve 15 of a centre shaft frame of the bicycle. When the wheel plate is rotated, hall elements 1 and 2 fixed on the bracket 3 obtain the information about the pedal force, the speed, and the steering direction through detecting signals of a magnetic sheet fixed on a wheel plate. Owing to non-contact detection, a transducer can not be abraded easily, and the utility model has the advantages of high reliability and convenient maintenance.

Description

Electric power-assisted bicycle automatic detection device

The utility model belongs to the field of electric bicycle manufacturing, and is particularly suitable for non-contact detection of pedal force, speed and steering.

The pedaling force detection of existing intelligent electric bicycles generally adopts the central shaft or chain stress detection method, and the control of the electric bicycle is realized through the pressure detection of the contacts. This detection method requires high sensor technology and high cost, and one sensor cannot simultaneously detect and control pedal force, speed and steering.

The utility model adopts a device which can simultaneously detect pedaling force, speed and steering with one sensor; at the same time, due to the use of non-contact detection, there is no wear on the sensor and high reliability; after the sensor is calibrated by the factory, it does not need to be reset Calibration, easy maintenance.

The utility model relates to an electric bicycle detection device, which is composed of an outer wheel 7, an inner wheel 8, an outer baffle 9, a screw 10, an inner baffle 11, a clasp 12, a pin 13, and a shaft frame sleeve in the vehicle. 15. It is characterized in that a bracket 3 is fixed on the axle frame sleeve 15 in the vehicle, Hall element 1 and Hall element 2 are fixed on the bracket 3, a magnetic piece 4 is fixed on the outer wheel disc 7, and a magnetic piece 4 is fixed on the inner wheel disc 8. The magnetic sheet 5 and the magnetic sheet 6 are fixed, and an arc-shaped hole is dug on the inner wheel disc 8, and a pin 13 and a spring 14 are embedded in the hole. in a state of surface contact.

The improved big roulette is made up of inner roulette 8 and outer roulette 7, and inside and outside roulette is connected by outer baffle 9, screw 10, snap ring 12, inner baffle 11, pin 13, spring 14. This structure ensures that when a person steps on the pedal in the forward direction, the spring 14 produces a slight deformation, the inner and outer wheels can slide relative to each other, and the relative positions of the magnetic sheet 4 and the magnetic sheet 5 change. When stepping on the pedal in reverse, the spring 14 has no deformation, the inner and outer wheels have no slippage, and the relative positions of the magnetic sheet 4 and the magnetic sheet 5 remain unchanged. When the wheel rotates, the Hall element 1 and the Hall element 2 fixed on the bracket 3 can obtain pedal force, speed, and steering information by detecting the signals of the magnetic pieces fixed on the wheel.

Working principle: During forward rotation, due to the relative sliding between the inner and outer wheels, the relative position changes between the magnetic sheet 4, the magnetic sheet 5, and the magnetic sheet 6 are shown in Figure 3. The measured waveform is shown in Figure 4. If the signal on the Hall element 2 is detected first, it means that the wheel is rotating forward. Record the low-level time T2 on the Hall element 1, and then calculate the cycle time according to the length L2 of the magnetic sheet 1. Rotating speed. Simultaneously record the low-level time T1 on Hall element 2, assuming that the speed of the Hall element is stable when it is working, and then assuming that the distances from disks 4, 5, and 6 to the center of the wheel are equal, L1/L2=T1/T2 can be obtained, and There is a linear relationship between L1/L2 and the pedaling force value, so the pedaling force calculation formula F=4kr2(L1/L2-m)/r1=4kr2(T1/T2-m)/r1 can be obtained, where F is the pedaling force, k is the elastic coefficient of the spring, r2 is the distance from the spring position to the center of the wheel, r1 is the distance from the disk to the center of the wheel, T1 is the low-level time for detecting Hall element 2, and T2 is the low-level time for detecting Hall element 1 , m is the value of L1/L2 when the pedal force is 0. There is no relative sliding between the inner and outer wheels when reversing, and the relative position of the magnetic plates is shown in Figure 5. The waveforms measured by the single-chip microcomputer from the Hall elements 1 and 2 are shown in Figure 6. First, the low level on the Hall element 1 is detected. signal, it is considered that the roulette is reversed and the pedaling force is 0.

The utility model has the advantage that one sensor can detect pedaling force, speed and steering at the same time; at the same time, due to the use of non-contact detection, there is no wear on the sensor and high reliability; Calibration, easy maintenance.

Fig. 1 is a schematic diagram of the large wheel structure and sensor installation structure of the utility model;

Fig. 2 is a side view of the large wheel structure and the sensor installation structure;

Figure 3 is the relative position of the magnetic pieces during forward rotation;

Figure 4 is the waveform detected by the Hall element during forward rotation;

Figure 5 is the relative position of the magnetic pieces when reversing;

Figure 6 is the waveform detected by the Hall element during inversion.

Below in conjunction with accompanying drawing, the utility model is further described.

The improved big roulette is made up of inner roulette 8 and outer roulette 7, and inside and outside roulette is connected by outer baffle 9, screw 10, snap ring 12, inner baffle 11, pin 13, spring 14. This structure ensures that when a person steps on the pedal in the forward direction, the spring 14 produces a slight deformation, the inner and outer wheels can slide relative to each other, and the relative positions of the magnetic sheet 4 and the magnetic sheet 5 change. When stepping on the pedal in reverse, the spring 14 has no deformation, the inner and outer wheels have no slippage, and the relative positions of the magnetic sheet 4 and the magnetic sheet 5 remain unchanged. When the wheel rotates, the Hall element 1 and the Hall element 2 fixed on the bracket 3 can obtain pedal force, speed, and steering information by detecting the signals of the magnetic pieces fixed on the wheel. Working principle: During forward rotation, due to the relative sliding between the inner and outer wheels, the relative position changes between the magnetic sheet 4, the magnetic sheet 5, and the magnetic sheet 6 are shown in Figure 3. The measured waveform is shown in Figure 4. If the signal on the Hall element 2 is detected first, it means that the wheel is rotating forward. Record the low-level time T2 on the Hall element 1, and then calculate the cycle time according to the length L2 of the magnetic sheet 1. Rotating speed. Simultaneously record the low-level time T1 on Hall element 2, assuming that the speed of the Hall element is stable when it is working, and then assuming that the distances from disks 4, 5, and 6 to the center of the wheel are equal, L1/L2=T1/T2 can be obtained, and There is a linear relationship between L1/L2 and the pedaling force value, so the pedaling force calculation formula F=4kr2(L1/L2-m)/r1=4kr2(T1/T2-m)/r1 can be obtained, where F is the pedaling force, k is the elastic coefficient of the spring, r2 is the distance from the spring position to the center of the wheel, r1 is the distance from the disk to the center of the wheel, T1 is the low-level time for detecting Hall element 2, and T2 is the low-level time for detecting Hall element 1 , m is the value of L1/L2 when the pedal force is 0. There is no relative sliding between the inner and outer wheels when reversing, and the relative position of the magnetic plates is shown in Figure 5. The waveforms measured by the single-chip microcomputer from the Hall elements 1 and 2 are shown in Figure 6. First, the low level on the Hall element 1 is detected. signal, it is considered that the roulette is reversed and the pedaling force is 0.

Claims (1)

1. electric assisted bicycle automatic detection device, this device is by outer wheel disc 7, interior wheel disc 8, outer baffle 9, screw 10, Internal baffle 11, snap ring 12, pin 13, pedestal sleeve 15 is formed in the car, it is characterized in that having fixed on the pedestal sleeve 15 in the car support 3, be fixed with Hall element 1 on the support 3, Hall element 2, be fixed with magnetic sheet 4 on the outer wheel disc 7, be fixed with magnetic sheet 5 and magnetic sheet 6 on the interior wheel disc 8, dug the arc hole on the interior wheel disc 8, stud with pin 13 and spring 14 in the hole, interior wheel disc 8 is connected by pin 13 with outer wheel disc 7, is surface contact state between pin 13 and the spring 14.

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