CN2261618Y

CN2261618Y - Electronic speedometer

Info

Publication number: CN2261618Y
Application number: CN96211949U
Authority: CN
Inventors: 倪安镇; 谢修敏
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-22
Filing date: 1996-05-22
Publication date: 1997-09-03
Anticipated expiration: 2006-05-22

Abstract

The utility model relates to an electronic speedometer, which is characterized in that a photoelectric coupler and a supporting frame are arranged in a sealed casing, diaphragm sheets are installed on an optical path through the connection of a joint and an output shaft of a gear box, the pulse output of the photoelectric coupler is connected with the transducer signal input end of an application specific integrated circuit, a worm rod is installed on a main shaft of a step motor driven by the application specific integrated circuit, the worm rod is engaged with a worm wheel which is coaxial with a driving gear, and the worm rod respectively engaged with worm wheels of a spiral counting character wheel group and a partial sum character wheel group is coaxially fixed on a driven gear. The utility model reflects Chinese technological level of car instrument industries, and the utility model can meet the requirements of high grade electronic speedometers on cars which are made in China.

Description

Electronic speedometer

The utility model belongs to measuring apparatus, particularly relates to a kind of electronic vehicle speedometer.

The automobile speed mileometer of present introduction of foreign technology and element, be that rotating speed with output shaft of gear-box is via tongue tube, sensor that the plastic hoop of four pairs of magnetic poles constitutes or the sensor that adopts hall device to constitute are converted to electric impulse signal, deliver to and comprise frequency divider, the special IC of monostalbe trigger and constant-current source circuit, the wide-angle electric current gauge outfit of this circuit output drive stepping motor and the indication speed of a motor vehicle, stepper motor drives the mechanical counter accumulative mileage, the driving-chain processing technology of its sensor and mechanical counter is higher, the needs of incompatibility domestic car penetration of electron speedometer.

The driving-chain processing technology that the purpose of this utility model provides a kind of sensor and mechanical counter is simple, is of value to the electronic speedometer that domestic car improves grade.

Above-mentioned purpose is achieved through the following technical solutions: the photoelectrical coupler and the support 4 that place closed shell 12, the light hurdle sheet 3 that is connected with output shaft of gear-box by joint 1 is housed on its light path, the pulse output of photoelectrical coupler is connected to the sensor signal input end of special IC IC1, the stepper motor 11 that this special IC drives, its main shaft is equipped with worm screw 12, and be meshed with the coaxial worm gear 13 of driving gear 14, driven gear 15 is coaxial to be fixed with the worm screw 17 that is meshed with the

worm gear

16,18 of accumulative total character wheel group 9 and subtotal character wheel group 6 respectively.

Light hurdle sheet 3 is provided with 16 Guang Lan holes;

Special IC IC1 selects BL2115 for use, and the pin 11 unsettled frequency dividing circuits that make are 32 frequency divisions, and pin 7, pin 9 connect the photoelectrical coupler receiving tube D2+ utmost point through resistance R 1, R2 respectively, and power supply+end connects the photoelectrical coupler power valve D1+ utmost point with resistance R 3;

The driving-chain ratio of gear of stepper motor 11 accumulative totals, subtotal character wheel group 9,6 is 63.7, and wherein worm screw 12 is 7 with the ratio of gear of worm gear 13, and driving gear 14 is 0.7 with the ratio of gear of driven gear 15, and worm screw 17 is 13 with the ratio of gear of

worm gear

16,18;

Stepper motor 11 to the driving-chain ratio of gear of accumulative total, subtotal character wheel group 9,6 is 62.4, and wherein worm screw 12 is 8 with the ratio of gear of worm gear 13, and driving gear 14 is 0.6 with the ratio of gear of driven gear 15, and worm screw 17 is 13 with the ratio of gear of

worm gear

16,18.

Below with drawings and Examples explanation the utility model.

Accompanying drawing 1, sensor construction synoptic diagram;

Accompanying drawing 2, Figure 1A are to view;

Accompanying drawing 3, machine core structure synoptic diagram;

Accompanying drawing 4, the utility model electrical schematic diagram.

Drawing explanation: 1 joint, 2 seal casinghousings, 3 smooth hurdle sheets, 4 photoelectrical couplers and support, 5 cables, 6 subtotal character wheel groups, 7 indicator axles, 8 wide-angle electric current gauge outfits, 9 accumulative total character wheel groups, 10 movement base plates, 11 stepper motors, the gear-driven worm and worm wheel of 12,13 first order, 14, gear-driven driving gear in 15 second level and driven gear, the gear-driven worm and worm wheel of 17,16,18 third level, 19 subtotal character wheel groups reset and push away handle, 20 printed circuit board (PCB)s, 21 table covers.

Sensor as shown in Figure 1, 2, formed by joint 1, seal casinghousing 2, light hurdle sheet 3, photoelectrical coupler and support 4 and three core cables 5, light hurdle sheet 3 is provided with 16 Guang Lan holes, and automotive electronics speedometer standard speed ratio is that 1: 637 and 1: 624 o'clock speed of a motor vehicle and sensor output pulse frequency corresponding relation are as follows:

The speed of a motor vehicle (km/h)	20	30	40	60	80	90	100
The speed of a motor vehicle (km/h)	20	30	40	60	80	90	100	(speed ratio 1: 637 o'clock) signal frequency (HZ)	56.62	84.93	113.24	169.87	226.49	254.80	283.11
(speed ratio 1: 624 o'clock) signal frequency (HZ)	55.47	83.20	110.93	166.40	221.87	249.60	277.33	(speed ratio 1: 637 o'clock) signal frequency (HZ)	56.62	84.93	113.24	169.87	226.49	254.80	283.11

Electronic speedometer movement shown in Fig. 3 is represented by being made of 3 grades of gear drives the driving-chain of stepper motor 11 to accumulative total, subtotal character wheel group 9,6 that movement base plate 10 and each clamping plate support, and be designed to two kinds of speed ratios, be respectively: the 1st grade of gear-driven worm screw 12 and worm gear 13 ratio of gear are 7 or 8, the ratio of gear of the 2nd grade of gear-driven driving gear 14 and driven gear 15 is 0.7 or 0.6, the ratio of gear 13 of gear-driven worm screw 17 of 3rd level and

worm gear

16,18, the overall ratio of its driving-chain is respectively 63.7 and 62.4.The corner of stepper motor 11 is determined by IC1BL2115 pin 10 and pin 11 connected modes of Fig. 4, the frequency dividing circuit that the utility model is set IC1BL2115 is 32 frequency divisions, being that pin 11 is unsettled matches with two kinds of ratio of gear of sensor pulse signal frequency and driving-chain shown in Figure 3, makes the utility model be fit to standard speed ratio 1: 637 respectively and 1: 624 vehicle is used.

Fig. 4 is the utility model electrical schematic diagram; automobile power source+end of introducing through protection diode D3 connects the photoelectrical coupler power valve D1+ utmost point through resistance R 3, K; the pin 7 of integrated circuit (IC) 1BL2115, pin 9 are respectively through resistance R 1, R2; connect the photoelectrical coupler receiving tube D2+ utmost point simultaneously, make special IC IC1BL2115 connect normal operation of sensor of the present utility model.Printed circuit board (PCB) 20 is fixed on the support of table cover 21.

The driving-chain structural design compactness of sensor of the present utility model and mechanical counter is fit to China's automobile instrument industrial technology level fully, and low cost of manufacture can satisfy domestic car and improve grade to the demand of electronic speedometer.

Claims

1, electronic speedometer, by the table cover, dial plate, wide-angle electric current gauge outfit, stepper motor, accumulative total character wheel group, subtotal character wheel group, special IC and printed-wiring board (PWB) are formed, it is characterized in that: the photoelectrical coupler and the support that place closed shell, the light hurdle sheet that is connected with output shaft of gear-box by joint is housed on its light path, the pulse output of photoelectrical coupler is connected to the sensor signal input end of special IC, its main shaft of stepper motor that this special IC drives is equipped with worm screw, and be meshed with the coaxial worm gear of driving gear, driven gear is coaxial to be fixed with the worm screw that is meshed with the worm gear of accumulative total character wheel group and subtotal character wheel group respectively.

2, electronic speedometer as claimed in claim 1 is characterized in that: light hurdle sheet is provided with 16 Guang Lan holes.

3, electronic speedometer as claimed in claim 1, it is characterized in that: special IC is selected BL2115 for use, pin 11 is unsettled, its frequency dividing circuit is 32 frequency divisions, pin 7, pin 9 connect photoelectrical coupler receiving tube+utmost point through resistance R 1, R2 respectively, and power supply+end connects photoelectrical coupler power valve+utmost point through resistance R 3.

4, electronic speedometer as claimed in claim 1 is characterized in that: stepper motor is to the driving-chain of accumulative total, subtotal character wheel group, and ratio of gear is 63.7 or 62.4.