CN2213999Y

CN2213999Y - Infrared bicycle speed meter

Info

Publication number: CN2213999Y
Application number: CN 94220617
Authority: CN
Inventors: 苏鸿裕
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-07
Filing date: 1994-09-07
Publication date: 1995-11-29
Anticipated expiration: 2004-09-07

Abstract

The utility model relates to an infrared bicycle speed meter. The utility model makes use of a magnetic reed switch to receive pulses generated from the rotation of wheels, and deliver the pulses into a monostable circuit. Signals with a certain pulse width generated by the monostable circuit are ejected with infrared lights, received by an infrared receiver, filtered by a filter circuit to extract trashes, and then delivered into a microprocessor to carry out calculation and processing. The results of vehicle speed, mileage, etc., are finally shown through a liquid crystal display. The device has no need for using any wire, and can improve the entire aesthetic sense and the travelling safety of bicycles.

Description

Infrared bicycle speed meter

The utility model relates to a kind of bicycle accessory, exactly, relates to a kind of infrared ray bicycle speedometer.

Though automobile is the main vehicles, be suitable for lying fallow, the bicycle of body-building and non-environmental-pollution has the valued tendency that heals day recently.Because the design of bicycle is based on convenient, speedometer, indicator or other warning lamps all have been omitted on Regular Bicycle, therefore, can not influence riding safety unavoidably.Now, the speedometer of being installed on some bicycle all is the tach signal that transmits wheel with electric wire, via circuit or physical construction it is presented on the speedometer.This guy structure for the simple bicycle of car body, not only is repugnant to the eye, and bicycle is difficult to effectively contain lead, is easily mixed or causes by the foreign material hook and damage or cause danger under steam.These all are the significant deficiency of existing bicycle speedometer.

The purpose of this utility model provides a kind of infrared ray bicycle speedometer that traffic safety is attractive in appearance with the enhancement car body, understand the speed of a motor vehicle that helps to improve.

The utility model includes: the emitter element that is made of Magnetic Sensor part and monostable circuit and trigger circuit thereof, the receiver parts that constitute by reception, amplification, filtering circuit, it is characterized in that: the Magnetic Sensor part is contained in respectively on the width of cloth bar of cycle wheel and the front forked bracket corresponding with it, and makes the receiver hole formation straight line corresponding relation on infrared light transmitting aperture and the receiver parts that are installed on the bicycle rack on its emitter element; In receiver, also be installed on the microprocessor chip that utilizes the infrared ray reception and count, calculate and show through amplification, filtered pulse.

Characteristics of the present utility model are to adopt infrared ray transfer car wheel speed pulse signal, and utilize the microprocessor chip that tacho-pulse is calculated demonstration; Omit the lead burden that common bicycle speedometer is had, both guaranteed traffic safety.It is attractive in appearance to improve car body again.

Fig. 1 is an assembling schematic perspective view of the present utility model.

Fig. 2 is a control method block diagram of the present utility model.

Fig. 3 is a radiating portion preferred embodiment circuit diagram of the present utility model.

Fig. 4 is a receiving unit preferred embodiment circuit diagram of the present utility model.

Consult Fig. 1, the utility model is on the wheel width of cloth bar of bicycle a magnetic element 10 to be installed, and with the vehicle front forked bracket of its opposite position on a magnetic reed switch and emitter 11 are installed, when turning a wheel, magnetic sensitive circuit in this emitter 11 can responsive be tested the cycle rotating signal of magnetic element 10, and the infrared light transmitting aperture of this signal by its top be emitted to receiving trap 12 on side's vehicle frame provided thereon, make the infrared light receiver hole of receiving trap constitute the straight line corresponding relation with the transmitting aperture of its emitter 11, circuit in it and microprocessor chip calculate rotational speed pulse signal and with rotating speed again, data presentation such as mileage are on the LCD of receiving trap 12.

Consult working routine block scheme of the present utility model shown in Figure 2.At first magnetic reed switch receives the wheel rotation and the pulse of generation, a monostable circuit is sent in this pulse, this monostable circuit makes the width of above-mentioned pulse become a definite value, again that this pulsewidth is certain pulse transfers to infrared transmitter, via infrarede emitting diode this signal is gone out with infrared.This infrared pulse signal is received by the infrared ray reception amplifier and amplifies, and again by its filtering circuit filtering transmitter contained high-frequency signal and other noises, sends into microprocessor and carries out computing and only extract useful signal.Microprocessor only carries out calculation process to the signal of pulsewidth fixed length, so extraneous interference signal can not cause misoperation, and operation result is presented on the LCD, the user also can utilize an external button to select the account form and the computing function (as kilometer, meter, mile, lining etc.) of microprocessor, or as the output of light control, stand by lamp control.

Consult Fig. 3, radiating circuit of the present utility model mainly is to constitute the magnetic force testing circuit by Q1, Q2 transistor, and after recording the magnetic force signal, shaping, monostable circuit through four AND circuit formations of U2A～U2D, make the width of above-mentioned magnetic force pulse signal become a definite value, amplify via the Q3 transistor again, drive infrared device IRLD1, IRLD2 signal is launched.

Consult Fig. 4, reception control circuit of the present utility model is after receiving above-mentioned transmitting, amplify through transistor Q5 earlier, carry out filtering by transistor Q6, Q7, Q8 again, so that obtain the useful signal identical with the transmitter pulse width, and other noises of filtering and input to microprocessor and handle (this figure omit), so that can carry out relevant calculation and show corresponding data.

Claims

1, a kind of infrared ray bicycle speedometer, include the emitter element that constitutes by Magnetic Sensor part and monostable circuit and trigger circuit thereof, the receiver parts that constitute by reception, amplification, filtering circuit, it is characterized in that: the Magnetic Sensor part is contained in respectively on the width of cloth bar of cycle wheel and the front forked bracket corresponding with it, and makes the receiver hole formation straight line corresponding relation on infrared light transmitting aperture and the receiver parts that are installed on the bicycle rack on its emitter element; In receiver, also be installed on the microprocessor chip that utilizes the infrared ray reception and count, calculate and show through amplification, filtered pulse.