CN2462356Y

CN2462356Y - Automatic detecting device of electric booster bicycle

Info

Publication number: CN2462356Y
Application number: CN 01201843
Authority: CN
Inventors: 余达太; 马相峰; 张明浩; 胡健中; 张卫冬; 晏蔚光
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2001-01-18
Filing date: 2001-01-18
Publication date: 2001-11-28
Anticipated expiration: 2011-01-18

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

The electric assisted bicycle automatic detection device

The utility model belongs to electric bicycle and makes the field, is specially adapted to the contactless detection to pedaling power, speed and turning to.

Existing intelligent electric bicycle pedal power detects general axis or the chain stress detection mode of adopting, and realizes control to electric bicycle by the pressure detection to the contact.This detection mode is high to the sensor process requirement, cost is big, a sensor can not detect control to pedaling power, speed and turning to simultaneously simultaneously.

The utility model adopts a kind of device can detect pedaling power, speed and turning to simultaneously with a sensor; Be contactless detection owing to what adopt simultaneously, sensor do not had wearing and tearing, the reliability height; After producer demarcated when sensor dispatched from the factory, need not to demarcate again in the future, easy to maintenance.

The utility model relates to a kind of electric bicycle pick-up unit, 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.

Big trochal disc after the improvement is made up of interior wheel disc 8 and outer wheel disc 7, and inside and outside wheel disc connects by outer baffle 9, screw 10, snap ring 12, Internal baffle 11, pin 13, spring 14.This structure has guaranteed the people when the forward pedal, and spring 14 produces small deformation, and inside and outside wheel disc can produce relative slip, and magnetic sheet 4 and magnetic sheet 5 relative positions change.Oppositely during pedal, spring 14 is undeformed, and inside and outside wheel disc is fricton-tight, and magnetic sheet 4 and magnetic sheet 5 relative positions are constant.When wheel disc rotates, be fixed on Hall element 1 on the support 3 and Hall element 2 and be fixed on the signal of the magnetic sheet on the wheel disc, can obtain legpower, speed, and direction information by detection.

Principle of work: when just changeing since relatively slide between inside and outside wheel disc cause magnetic sheet 4, magnetic sheet 5, and magnetic sheet 6 between relative position change as shown in Figure 3, the waveform that single-chip microcomputer records from Hall element 1 and Hall element 2 as shown in Figure 4, if detect the signal on the Hall element 2 earlier, illustrate that wheel disc just changes, low level time T2 on the record Hall element 1 can be regarded as out the bicycle rotating speed according to magnetic sheet 1 length L 2 again.Write down the low level time T1 on the Hall element 2 simultaneously, stabilization of speed when supposing Hall element work, suppose magnetic sheet 4 again, 5,6 is equal to wheel disc centre distance, can get L1/L2=T1/T2, and there is linear relationship between L1/L2 and the legpower value, calculate formula F=4kr2 (L1/L2-m)/r1=4kr2 (T1/T2-m)/r1 so can draw legpower, wherein F is for pedaling power, k is a elastic coefficient, r2 be spring position to wheel disc centre distance, r1 be magnetic sheet to wheel disc centre distance, T1 is for detecting the low level time of Hall element 2, T2 is for detecting the low level time of Hall element 1, and m is that legpower is the value of 0 o'clock L1/L2.Inside and outside wheel disc does not have relative slip during counter-rotating, the magnetic sheet relative position as shown in Figure 5, the waveform that single-chip microcomputer records from Hall element 1,2 detects low level signal on the Hall element 1 earlier as shown in Figure 6, thinks that wheel disc counter-rotating, the power of pedaling are 0.

Advantage of the present utility model is, can detect pedaling power, speed and turning to simultaneously with a sensor; Be contactless detection owing to what adopt simultaneously, sensor do not had wearing and tearing, the reliability height; After producer demarcated when sensor dispatched from the factory, need not to demarcate again in the future, easy to maintenance.

Fig. 1 is the utility model big trochal disc structure and sensor fixing structure synoptic diagram;

Fig. 2 is the side view of big trochal disc structure and sensor fixing structure;

Fig. 3 is a magnetic sheet relative position when just changeing;

Fig. 4 is the detected waveform of Hall element when just changeing;

Magnetic sheet relative position when Fig. 5 is counter-rotating;

The detected waveform of Hall element when Fig. 6 is counter-rotating.

Below in conjunction with Figure of description the utility model is further described.

Big trochal disc after the improvement is made up of interior wheel disc 8 and outer wheel disc 7, and inside and outside wheel disc connects by outer baffle 9, screw 10, snap ring 12, Internal baffle 11, pin 13, spring 14.This structure has guaranteed the people when the forward pedal, and spring 14 produces small deformation, and inside and outside wheel disc can produce relative slip, and magnetic sheet 4 and magnetic sheet 5 relative positions change.Oppositely during pedal, spring 14 is undeformed, and inside and outside wheel disc is fricton-tight, and magnetic sheet 4 and magnetic sheet 5 relative positions are constant.When wheel disc rotates, be fixed on Hall element 1 on the support 3 and Hall element 2 and be fixed on the signal of the magnetic sheet on the wheel disc, can obtain legpower, speed, and direction information by detection.Principle of work: when just changeing since relatively slide between inside and outside wheel disc cause magnetic sheet 4, magnetic sheet 5, and magnetic sheet 6 between relative position change as shown in Figure 3, the waveform that single-chip microcomputer records from Hall element 1 and Hall element 2 as shown in Figure 4, if detect the signal on the Hall element 2 earlier, illustrate that wheel disc just changes, low level time T2 on the record Hall element 1 can be regarded as out the bicycle rotating speed according to magnetic sheet 1 length L 2 again.Write down the low level time T1 on the Hall element 2 simultaneously, stabilization of speed when supposing Hall element work, suppose magnetic sheet 4 again, 5,6 is equal to wheel disc centre distance, can get L1/L2=T1/T2, and there is linear relationship between L1/L2 and the legpower value, calculate formula F=4kr2 (L1/L2-m)/r1=4kr2 (T1/T2-m)/r1 so can draw legpower, wherein F is for pedaling power, k is a elastic coefficient, r2 be spring position to wheel disc centre distance, r1 be magnetic sheet to wheel disc centre distance, T1 is for detecting the low level time of Hall element 2, T2 is for detecting the low level time of Hall element 1, and m is that legpower is the value of 0 o'clock L1/L2.Inside and outside wheel disc does not have relative slip during counter-rotating, the magnetic sheet relative position as shown in Figure 5, the waveform that single-chip microcomputer records from Hall element 1,2 detects low level signal on the Hall element 1 earlier as shown in Figure 6, thinks that wheel disc counter-rotating, the power of pedaling are 0.

Claims

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.