CN202947747U - Automotive speedometer and engine tachometer comprehensive checking device - Google Patents
Automotive speedometer and engine tachometer comprehensive checking device Download PDFInfo
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- CN202947747U CN202947747U CN 201220645288 CN201220645288U CN202947747U CN 202947747 U CN202947747 U CN 202947747U CN 201220645288 CN201220645288 CN 201220645288 CN 201220645288 U CN201220645288 U CN 201220645288U CN 202947747 U CN202947747 U CN 202947747U
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Abstract
The utility model discloses an automotive speedometer and engine tachometer comprehensive checking device. The device comprises a host circuit board, a microprocessor, an integrated phase-locked loop, a dual operational amplifier, a double-D trigger, a decimal counter/distributor, and a programmable BCD (binary coded decimal) synchronous 1/N counter, wherein a control circuit board includes a CPU, an output connector CZ1, and an indicating lamp decoding drive circuit; and the control circuit board is connected with the host circuit board in a chassis through a signal lead-out socket. A frequency synthesizer composed of the integrated phase-locked loop of the host circuit board and the programmable BCD synchronous 1/N counter transmits high-accuracy pulsed signals. Particularly, the integrated phase-locked loop represents higher damping during the frequency capturing process, so that the pointer of a pointer instrument oscillates stably to prevent shaking or overshoot near a test point; and the programmable BCD synchronous 1/N counter can generate pulsed signals with different frequencies to adapt to the speed transmission ratio of different types of vehicles.
Description
Technical field
The utility model relates to automobile instrument panel speedometer and engine speed calibration equipment, particularly relates to a kind of automobile odometer and engine speed indicator comprehensive calibration device.
Background technology
Pointer-type speedometer and engine speed indicator are two very important instrument in the modern automobile industry field, they not only carry out Real-Time Monitoring and are indicated with the form of pointer scale car speed and engine speed, and guidance system, ABS system, oil consumption calculating, engine control all need the speed of a motor vehicle and tach signal to come for referencial use.Car speed has the meaning of particular importance for safety traffic, different road conditions also have different requirements to the speed of a motor vehicle, and we can see the signs such as speed limit 30Km/h, 60Km/h often, and national law on road traffic safety rule have been carried out specified in more detail to this.Therefore in national standard, the pointing accuracy of speedometer mileage and engine speed indicator is made clear, must carry out accuracy test and verification before each automobile instrument panel dispatches from the factory, met national standard and industry standard to guarantee product quality.On the other hand, automobile all will carry out the maintenance in mid-term and safeguard after a period of time of travelling, also be necessary during this period speedometer and engine speed indicator are carried out verification.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming and defect of above-mentioned prior art, a kind of automobile odometer and engine speed indicator comprehensive calibration device are provided, conveniently speedometer and engine speed indicator are carried out verification, in order in time panel board is carried out maintaining, make the verifying work of speedometer and tachometer gage be able to normality and complete.
The utility model is achieved through the following technical solutions:
A kind of automobile odometer and engine speed indicator comprehensive calibration device comprise cabinet, test control enclosure;
Be provided with stabilized voltage supply, host circuit board in described cabinet, host circuit board comprises accessory power outlet CZ2, CZ3, CZ4, microprocessor IC1, integrated phase lock IC2, two-way operational amplifier IC3, double D trigger IC4, decimal system counting/divider IC5, the synchronous 1/N counter of BCD able to programme IC6 ~ IC9;
Be provided with control circuit board in described test control enclosure, control circuit board comprises CPU, out connector CZ1, the first LED light decoder driver circuit IC2, the second LED light decoder driver circuit IC3; Control circuit board draws socket outward by signal and is connected with host circuit board in cabinet.
Host circuit board comprises that also field effect transistor N3, transistor N4, resistance R 11, capacitor C 5 form power amplification circuits, and the signal spacing output circuit that forms of pulse booster transformer TR1, ceramic high-power resistance R12, high voltage rectifier D2.
Described cabinet also comprises front panel, rear panel, be provided with power light, power switch, rpm signal selecting switch on described front panel, be provided with cable socket, speedometer socket, tachometer gage socket, direct supply outlet terminal on described rear panel, described speedometer socket, tachometer gage socket are connected with speedometer, engine speed indicator respectively.
Described test control enclosure also comprises panel, be distributed with operation push-button S1 ~ S8, operation push-button S9 ~ S16, button pilot lamp L1 ~ L8, button pilot lamp L9 ~ L16, speed of a motor vehicle ratio of gear selection finger wheel DIP switch on panel, described operation push-button S1 ~ S8, operation push-button S9 ~ S16 connect into 4 * 4 matrix keyboard, the corresponding revolution speed meter pointer of operation push-button S1 ~ S8 position, the corresponding speedometer pointer position of operation push-button S9 ~ S16.
The line of described matrix keyboard is connected with I/O port P1.0 ~ P1.3 of CPU on control circuit board respectively, alignment is connected with I/O port P1.4 ~ P1.7 of CPU respectively, button pilot lamp L1 ~ L8 is connected on output pin Q1 ~ Q8 of the first LED light decoder driver circuit IC2, and button pilot lamp L9 ~ L16 is connected on output pin Q1 ~ Q8 of the second LED light decoder driver circuit IC3; Signal end A11 ~ A18 on out connector CZ1 is connected with cpu port P00 ~ P07, and the signal end A19 ~ A22 on out connector CZ1 is connected with cpu port P20 ~ P23.
Advantage of the present utility model and effect:
(1) to have precision high for the common given pulse signal of frequency synthesizer that consists of of the integrated phase lock IC2 of host circuit board, the synchronous 1/N counter of BCD able to programme IC6 ~ IC9, particularly integrated phase lock IC2 presents larger damping during frequency acquisition, this make have coil, the gauge pointer of hairspring, pointer structure swings very steadily, can not produce near test point and rock or overshoot; The synchronous 1/N counter of BCD able to programme IC6 ~ IC9 can produce the pulse signal of different frequency, to adapt to the speed of a motor vehicle gear ratio value of different automobile types.
(2) an independent button on each test point respective operations button, the speed of a motor vehicle/measurement of rotating speed shares a control enclosure, and signal identification distributes to be completed automatically by CPU, simple to operate clear.
(3) the test control enclosure is what to separate with host circuit board, only connect by cable, the test control enclosure can be placed on the place of workman's convenient operation, and this is in the situation that the test board work space is narrower, be very easy to tester's operation, improved work efficiency.
(4) for the actual condition of emulation automobile in advancing more truly, the Motor Engine Cylinder ignition process has been realized realistic simulation, the high-voltage pulse signal that obtains at the pulse transformer secondary can truly reflect the automotive ignition situation.
(5) the test control enclosure was realized connecting by cable socket, speedometer socket, tachometer gage socket with being connected all of host circuit board and tested instrument, and speedometer socket and tachometer gage socket can adopt aviation socket, so firm and reliable connection.In the situation that there are slight vibrations in test board, the signal transmission is also very stable.
Description of drawings
Fig. 1 a, Fig. 2 b are respectively pointer speedometer and engine speed indicator outside drawing.
Fig. 2 is that the utility model test control enclosure panel button is arranged schematic diagram.
Fig. 3 is that the cabinet rear panel is arranged schematic diagram.
Fig. 4 is that case front panel is arranged schematic diagram.
Fig. 5 is the control circuit board electrical schematic diagram in the test control enclosure.
Fig. 6 is one of host circuit board electrical schematic diagram in cabinet.
Fig. 7 is two of the interior host circuit board electrical schematic diagram of cabinet.
Embodiment
Below in conjunction with specific embodiment, the utility model is done further concrete detailed description the in detail.
Embodiment
As shown in Fig. 1～7, a kind of automobile odometer of the utility model and engine speed indicator comprehensive calibration device comprise cabinet, test control enclosure; Be provided with stabilized voltage supply, host circuit board in described cabinet, host circuit board comprises accessory power outlet CZ2, CZ3, CZ4, microprocessor IC1, integrated phase lock IC2, two-way operational amplifier IC3, double D trigger IC4, decimal system counting/divider IC5, the synchronous 1/N counter of BCD able to programme IC6 ~ IC9; Be provided with control circuit board in described test control enclosure, control circuit board comprises CPU, out connector CZ1, the first LED light decoder driver circuit IC2, the second LED light decoder driver circuit IC3; Control circuit board draws socket outward by signal and is connected with host circuit board in cabinet.
Described host circuit board comprises that also field effect transistor N3, transistor N4, resistance R 11, capacitor C 5 form power amplification circuits, and the signal spacing output circuit that forms of pulse booster transformer TR1, ceramic high-power resistance R12, high voltage rectifier D2.
Described cabinet also comprises front panel, rear panel, be provided with power light, power switch, rpm signal selecting switch on described front panel, be provided with cable socket, speedometer socket, tachometer gage socket, direct supply outlet terminal on described rear panel, described speedometer socket, tachometer gage socket are connected with speedometer, engine speed indicator respectively.
Described test control enclosure also comprises panel, be distributed with operation push-button S 1 ~ S8, operation push-button S9 ~ S16, button pilot lamp L1 ~ L8, button pilot lamp L9 ~ L16, speed of a motor vehicle ratio of gear selection finger wheel DIP switch on panel, described operation push-button S1 ~ S8, operation push-button S9 ~ S16 connect into 4 * 4 matrix keyboard, the corresponding revolution speed meter pointer of operation push-button S1 ~ S8 position, the corresponding speedometer pointer position of operation push-button S9 ~ S16.
The line of described matrix keyboard is connected with I/O port P1.0 ~ P1.3 of CPU on control circuit board respectively, alignment is connected with I/O port P1.4 ~ P1.7 of CPU respectively, button pilot lamp L1 ~ L8 is connected on output pin Q1 ~ Q8 of the first LED light decoder driver circuit IC2, and button pilot lamp L9 ~ L16 is connected on output pin Q1 ~ Q8 of the second LED light decoder driver circuit IC3; Signal end A11 ~ A18 on out connector CZ1 is connected with cpu port P00 ~ P07, and the signal end A19 ~ A22 on out connector CZ1 is connected with cpu port P20 ~ P23.
For ease of better understanding the utility model, specifically be explained below in conjunction with Fig. 5, Fig. 6, Fig. 7.
As Fig. 5, be provided with control circuit board in the test control enclosure.In figure, CPU is that IC1(is hereinafter to be referred as microprocessor), select AT89C51, first, second pilot lamp decoder driver circuit IC2, IC3 to select CD4028.The course of work below in conjunction with Fig. 5 electrical schematic diagram explanation test control enclosure:
Power on initial, microprocessor makes the line P1.4 ~ P1.7 of matrix keyboard be in input state under programmed control, and alignment P1.0 ~ P1.3 exports high level 1111, and S1 ~ S16 prepares for the scanning button.At this moment P20 ~ P27 exports full 0, makes button pilot lamp L1 ~ L16 entirely black, and P20 ~ P23 output 0000, P07 ~ P00 output 00000001 make the divide ratio of the frequency synthesizer in host circuit board equal 1.After finishing these initial work, just wait for tester's operation.If microprocessor scans one-touch, just remove on the one hand to light corresponding button pilot lamp, this button pilot lamp of microprocessor analysis region on the other hand, judge that this is the corresponding speed of a motor vehicle or rotating speed, judge again this corresponding speed of a motor vehicle or rotating speed pointer position, and then determine the frequency of the speed of a motor vehicle corresponding to button pilot lamp or tach signal.For speedometer, different automobile models has different speed of a motor vehicle ratio of gear, and therefore same pointer position has different signal frequencies.The selection of speed of a motor vehicle ratio of gear realizes by referring to DIP switch SWD.Microprocessor provides the speed of a motor vehicle/selection of speed signal RL by pin RXD simultaneously, and sends via connector CZ1 by I/O output port P23 ~ P20, P07 ~ P00 the provides divide ratio corresponding with this frequency.Relay J 1(on RL signal controlling host circuit board sees Fig. 7), realize automatic identification and the distribution of the speed of a motor vehicle/tach signal.Speedometer or tachometer gage on tester's while scope dial plate see whether pointer has pointed to the tram.So repeat, can the verification speedometer or tachometer gage on the each point position, check accordingly the error of this table, and judge whether it qualified.
As shown in Figure 6, host circuit board.Microprocessor IC1 produces a reference pulse signal under programmed control, its frequency is very stable, this standard-frequency signal is given the BIN pin of integrated circuit Phase Lock Loop IC 2.Two-way operational amplifier IC3(comprises IC3:A and IC3:B) consist of necessary loop filter in phase-locked loop.This is an active integral form wave filter.The phase signal that is proportional to two pulse signal AIN and BIN by 2 outputs of integrated circuit Phase Lock Loop IC is exported by the PC2 pin of integrated circuit Phase Lock Loop IC 2, after wave filter filtering high frequency clutter, can be obtained the direct current signal that only is directly proportional to the phase differential of reference pulse signal and frequency synthesizer output signal by 7 pin of operational amplifier IC3:B, send into again the input end VCIN of phaselocked loop voltage controlled oscillator, make the frequency of the output VCOUT of voltage controlled oscillator follow change.This signal is given the ÷ N frequency synthesizer that in Fig. 7, the synchronous 1/N counter of BCD able to programme IC6 ~ IC9(consists of again), complete the ÷ Fractional-N frequency to the VCOUT pulse signal.The output of frequency synthesizer is by " 0 " pin output of the synchronous 1/N counter of BCD able to programme IC6, after carrying out level translation through transistor N2, give the AIN end of integrated circuit Phase Lock Loop IC 2 in Fig. 6, integrated circuit Phase Lock Loop IC 2 compares the phase differential of AIN and BIN again, the gained phase discrimination signal is via the output of PC2 end, so go round and begin again, the output signal AIN of frequency synthesizer is equated fully with the frequency of reference frequency signal BIN, and normal value of phase phasic difference, this is the locking duty of phaselocked loop.as Fig. 7, voltage controlled oscillator output signal VCOUT in integrated circuit Phase Lock Loop IC 2, one the tunnel gives frequency synthesizer, decimal system counting/divider IC5(CD4017 is given on another road), comprising IC4:A and IC4:B through double D trigger IC4(again) one road signal directly is connected with connector CZ4 through ignition signal selector switch S22 after frequency division, another road signal is delivered to field effect transistor N3 and is carried out power amplification, because the load capacity of double D trigger IC4 is very limited, therefore after must amplifying via field effect transistor N3 isolation, the power of signal is improved, be sent to again high power transistor N4, come drive ignition former-wound coil TR1 by N4, make the secondary of TR1 produce the approximately high-voltage pulse signal of 400V of amplitude, exported by connector CZ4 through ignition signal selector switch S22.R12 is high-power ceramic resistance; be used for limiting the collector current of high power transistor N4; D2 is high voltage rectifier; when high power transistor N4 is turn-offing; be used for absorbing the induction electromotive force that produces in the primary coil of igniting former-wound coil TR1, thereby protection high power transistor N4 is not breakdown.
Each that comes that the divide ratio A10 of self-test control enclosure ~ A22 correspondence is connected to the synchronous 1/N counter of BCD able to programme IC6 ~ IC9 put several input end P0 ~ P3, under the phaselocked loop collaborative work, obtains at last needed signal frequency.Vehicle speed signal is exported by CZ3, and tach signal is exported by CZ4.
Fig. 6, in 7, each components and parts are selected as follows: microprocessor IC1 selects AT89C2051, integrated circuit Phase Lock Loop IC 2 is selected MC4046, the synchronous 1/N counter of BCD able to programme IC6 ~ IC9 selects CD4522, two-way operational amplifier IC3 selects LM1458, decimal system counting/divider IC5 selects CD4017, double D trigger IC4 selects CD4013, field effect transistor N3 selects IFR720, high power transistor N4 selects TIP41C, the model of relay J 1 choosing+12V work, lighting simulation coil TR1 needs oneself to make, adopt EE42 type skeleton, primary coil uses the enameled wire of wire diameter 0.5 around 250 circles, secondary coil uses the enameled wire of wire diameter 0.1 around 3000 circles.
As mentioned above, just can realize preferably the utility model.
Claims (5)
1. an automobile odometer and engine speed indicator comprehensive calibration device, is characterized in that comprising cabinet, test control enclosure;
Be provided with stabilized voltage supply, host circuit board in described cabinet, host circuit board comprises accessory power outlet CZ2, socket CZ3, socket CZ4, microprocessor IC1, integrated phase lock IC2, two-way operational amplifier IC3, double D trigger IC4, decimal system counting/divider IC5, the synchronous 1/N counter of BCD able to programme IC6 ~ IC9;
Be provided with control circuit board in described test control enclosure, control circuit board comprises CPU, out connector CZ1, the first LED light decoder driver circuit IC2, the second LED light decoder driver circuit IC3; Control circuit board draws socket outward by signal and is connected with host circuit board in cabinet.
2. automobile odometer according to claim 1 and engine speed indicator comprehensive calibration device, it is characterized in that host circuit board comprises that also field effect transistor N3, transistor N4, resistance R 11, capacitor C 5 form power amplification circuits, and the signal spacing output circuit that forms of pulse booster transformer TR1, ceramic high-power resistance R12, high voltage rectifier D2.
3. automobile odometer according to claim 1 and 2 and engine speed indicator comprehensive calibration device, it is characterized in that described cabinet also comprises front panel, rear panel, be provided with power light, power switch, rpm signal selecting switch on described front panel, be provided with cable socket, speedometer socket, tachometer gage socket, direct supply outlet terminal on described rear panel, described speedometer socket, tachometer gage socket are connected with speedometer, engine speed indicator respectively.
4. automobile odometer according to claim 1 and engine speed indicator comprehensive calibration device, it is characterized in that described test control enclosure also comprises panel, be distributed with operation push-button S 1 ~ S8, operation push-button S9 ~ S16, button pilot lamp L1 ~ L8, button pilot lamp L9 ~ L16, the speed of a motor vehicle on panel than selecting the finger wheel DIP switch, described operation push-button S1 ~ S8, operation push-button S9 ~ S16 connect into 4 * 4 matrix keyboard, the corresponding revolution speed meter pointer of operation push-button S1 ~ S8 position, the corresponding speedometer pointer position of operation push-button S9 ~ S16.
5. automobile odometer according to claim 4 and engine speed indicator comprehensive calibration device, the line that it is characterized in that described matrix keyboard is connected with I/O port P1.0 ~ P1.3 of CPU on control circuit board respectively, alignment is connected with I/O port P1.4 ~ P1.7 of CPU respectively, button pilot lamp L1 ~ L8 is connected on output pin Q1 ~ Q8 of the first LED light decoder driver circuit IC2, and button pilot lamp L9 ~ L16 is connected on output pin Q1 ~ Q8 of the second LED light decoder driver circuit IC3; Signal end A11 ~ A18 on out connector CZ1 is connected with cpu port P00 ~ P07, and the signal end A19 ~ A22 on out connector CZ1 is connected with cpu port P20 ~ P23.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220645288 CN202947747U (en) | 2012-11-28 | 2012-11-28 | Automotive speedometer and engine tachometer comprehensive checking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220645288 CN202947747U (en) | 2012-11-28 | 2012-11-28 | Automotive speedometer and engine tachometer comprehensive checking device |
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| CN202947747U true CN202947747U (en) | 2013-05-22 |
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| CN 201220645288 Expired - Fee Related CN202947747U (en) | 2012-11-28 | 2012-11-28 | Automotive speedometer and engine tachometer comprehensive checking device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123264A (en) * | 2012-11-28 | 2013-05-29 | 华南理工大学 | Comprehensive calibration device for speedometer and engine speed indicator of vehicle |
| CN105445497A (en) * | 2015-11-16 | 2016-03-30 | 陕西航空电气有限责任公司 | Method for calibrating photoelectric tachometer |
-
2012
- 2012-11-28 CN CN 201220645288 patent/CN202947747U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123264A (en) * | 2012-11-28 | 2013-05-29 | 华南理工大学 | Comprehensive calibration device for speedometer and engine speed indicator of vehicle |
| CN105445497A (en) * | 2015-11-16 | 2016-03-30 | 陕西航空电气有限责任公司 | Method for calibrating photoelectric tachometer |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20151128 |