CN2580402Y - Intelligent driving velometer for car speed - Google Patents

Abstract

The utility model relates to a velometer for car speed, particularly an intelligent driving velometer for car speed. The utility model comprises an indicating mechanism of a pointer instrument panel, an outer shell, and a machine core composed of a sensor, a worm spiral gear drive mechanism driven by a stepping motor which is controlled by a single chip computer. A voltage stabilizing circuit and a reset switch are connected between a power supply and the sensor, and a filter circuit is connected between the sensor and the single chip computer which outputs pulse signals to the stepping motor after software process. The drive mechanism of the stepping motor adopts a worm spiral gear drive device with high drive efficiency. By effective combination of software and hardware and stable drive mechanism, the velometer for car speed not only has higher drive pointing accuracy, but also has favorable linearity and consistency. After the pulse signals are filtered, the signals are stable, and the digital transmission and indication is precise. The adopted worm spiral gear engaging drive mechanism realizes larger transmission ratio and favorable shock resistance with smaller stage number, reduces the assembly space, and makes the cost low.

Description

The intelligent drives speedometer

Affiliated technical field

The utility model relates to a kind of speedometer of indicating vehicle speed mileage, especially intelligent drives speedometer.

Background technology

In the speedometer of prior art, adopt the input data of dual mode processing usually from sensor, a kind of is to adopt the moving-magnetic type winding configuration, utilizes the deflection of magnet to drive the pointer indication.Adopt this mode not only to need special-purpose integrated chip and peripheral circuit, and vibration resistance is poor, the linearity of indication is bad.Another kind is to adopt the moving-coil type core structure, utilizes the rotation of line bag to drive the pointer indication, and is same, needs special integrated chip and peripheral road, and the linearity and vibration resistance are all poor.Above-mentioned dual mode is owing to need coiling and bobbin is installed, and it is big therefore to take up room, and assemble also more complicated, and vibration resistance is poor, and Linearity is bad.Special integrated chip has defect of high cost.No. 95250593.2 utility model patents of Chinese patent disclose a kind of name and have been called " by the stepper motor driven auto meter movement of Single-chip Controlling ", this meter movement has a progression many, gear drive that transmission efficiency is low and return-to-zero mechanism are so transmission accuracy is not high.Single-chip microcomputer, sensor circuit that it adopts utilize resistance or frequency number treatment conversion digital quantity, do not have the support of stable filter regulator circuit, thereby have influenced the Linearity of transmission and the raising of precision.

Summary of the invention

Take up room greatly in order to overcome existing speedometer movement, complex structure, cost height, numeral are transferred low precision, the unfavorable deficiency of Linearity and consistance, the utility model provides a kind of intelligent drives speedometer, this speedometer is by effective software and hardware combining and stable gear train, higher transmission pointing accuracy is not only arranged, and have good linearty and consistance.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of speedometer, intelligent drives speedometer particularly, it comprises a pointer panel board indicating mechanism and shell body, and by sensor, the movement that Single-chip Controlling step motor drive gear drive is formed, its special character is: be connected with mu balanced circuit and reset switch between power supply and sensor, be connected with filtering circuit at sensor and through output pulse signal after the software processes between the single-chip microcomputer of stepper motor, the gear train that is contained between stepper motor and the indicating mechanism is the worm and helical gear gearing.

Reset switch of the present utility model is a backing pin that rotates synchronously with pointer, is with the combination switch of software in conjunction with simple and mechanical composition.

During work, the pulse signal of sensor output becomes the pulse signal of a frequency stabilization and gives single-chip microcomputer after Filtering Processing, and the corresponding pulse signal of output uses to stepper motor after software processes.Motor changes into mechanical rotation with this frequency signal and removes to drive the worm and helical gear gear train and rotate, and numeral indication machinery is intelligent on meter dial to indicate corresponding vehicle speed mileage thereby drive.

The utility model beneficial effect compared with prior art is, after filtering, the signal stabilization Linearity is good through signal in pulse, consistance accurately and reliably, the digital transmission indication accurately, error can be little of ignoring.The worm screw helical teeth engagement transmission mechanism that adopts has been realized bigger ratio of gear with less progression, has not only dwindled assembly space, has reduced cost, and transmission efficiency is also than gear drive height.It also makes its movement mechanism design succinct, the Linearity of indication and high conformity, and shock resistance is stronger.The reset switch of forming in conjunction with simple and mechanical part with software, reliability height not only, and need not drop into a large amount of parts, cost is reduced.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model theory structure block diagram.

Fig. 2 is the utility model inner structure synoptic diagram.

Fig. 3 is the A-A face cut-open view of Fig. 2

Embodiment

Fig. 1 has described the speedometer basic structure of being made up of sensor, single-chip microcomputer, stepper motor, gear train, indicating mechanism and reset switch.Device annexation and prior art between them are roughly the same, so be not described further.Fig. 2, Fig. 3 have described the assembly relation of the utility model inner structure.As can be seen from the figure pointer panel board 9 and numeral indication 7 thereof, mechanical cover body 8 has kept the citation form of prior art, with the prior art basically identical.The movement 1 by the Single-chip Controlling drive transmission device wherein has a worm screw 3 that is contained in 11 rotating shafts 4 of movement support body.This worm screw 3 with its on spiral gear 10 and the gear on worm 12 on stepper motor 2 main shafts, and constitute worm screw helical teeth gear trains with the gear 5 of worm mesh.Worm screw helical teeth rotating mechanism is a preferred forms of the present utility model, but to be not limited to be helical teeth, also can straight-tooth, and awl tooth or worm gear.Wherein be contained on position that is connected the stepper motor most convenient or the support of the showing body internal machine core 1 lower end by mu balanced circuit, reseting switch circuit, sensor, filtering circuit and the choosing of the circuit printing plate formed by the common single-chip microcomputer of software programming device Input Software.Because of software does not belong to scope of patent protection, so do not explain.Circuit in the circuit printing plate connects and selecting for use of components and parts is the known knowledge of common electricity professional and technical personnel.Single-chip microcomputer is selected general single chip for use, and can be but be not limited to be the single-chip microcomputer of PIC model class.Reset switch adopts the backing pin that pointer is synchronous, when pointer returns zero, electric signal of on-off circuit output that backing pin will be connected in the circuit printing plate is given single-chip microcomputer, zero makes pointer get back to stop after the zero-bit by resetting back, is powering on to indicate and prepare next time.The side that reset switch 6 is contained in movement 1 is connected with circuit printing plate.

Claims (3)

1. speedometer, intelligent drives speedometer particularly, it comprises a pointer panel board indicating mechanism and shell body, and the movement of forming by sensor, Single-chip Controlling step motor drive worm and helical gear gear train, it is characterized in that: between power supply and sensor, be connected with mu balanced circuit and reset switch, be connected with filtering circuit at sensor and through output pulse signal after the software processes between the single-chip microcomputer of stepper motor, the gear train that is contained between stepper motor and the indicating mechanism is the worm and helical gear gearing.

2. by the described speedometer of claim 1, it is characterized in that said reset switch is a backing pin that rotates synchronously with pointer, is with the combination switch of software in conjunction with simple and mechanical composition.

3. by the described speedometer of claim 1, it is characterized in that said combination switch (6) is connected with circuit printing plate at the side of movement (1).

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