CN1345669A - Inteligent type electronic speed meter for vehicle - Google Patents
Inteligent type electronic speed meter for vehicle Download PDFInfo
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- CN1345669A CN1345669A CN00124688.7A CN00124688A CN1345669A CN 1345669 A CN1345669 A CN 1345669A CN 00124688 A CN00124688 A CN 00124688A CN 1345669 A CN1345669 A CN 1345669A
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Abstract
The present invention relates to an intelligent electronic speedometer of motor vehicle, consisting of Hall vehicle speed sensor, liquid crystal display, magnetoelectric meter with pointer and electronic circuit. The speed pulse signal in the device is modulated by Hall vehicle speed sensor, its counter is used to count to produce identical speed pulse count value, and said counter value can be operated by chip microprocessor, and a digital signal for driving liquid crystal display to display vehicle speed is outputted, at the same time said chip microprocessor also can output a speed electric signal which is converted by D/A convertor and used for driving pointer and making it deflect to count speed. Said invention is an intelligent electronic speed meter with digita/analogue conversion and counting speed.
Description
The present invention relates to a kind of electronic vehicle speed table that vehicle running speed gauging device, especially automobiles such as automobile, motor bike, train are used that is used for.
At present, electronic vehicle speed table on the market is mainly pointer electron average speed indicator and digital electronic average speed indicator two classes.Its principle of design overwhelming majority is by the car speed sensor of being satisfied with on the automobile gearbox output shaft, and output is proportional to the vehicle speed pulse of the wheel number of turns, handles driving the pointer indication speed of a motor vehicle through a series of electronic circuits; Or, on charactron or Liquid Crystal Display (LCD), show the speed of a motor vehicle with digital form through the computing of micro controller system counting.The former, the impulse singla of car speed sensor output is through the integer circuit, and monostable circuit produces the square-wave signal of a fixed amplitude and pulse width, regulates the constant current source outgoing current, the magneto-electric gauge outfit of rotating band pointer.The latter, then the vehicle speed pulse with car speed sensor output is apart from equivalent, adopts M (frequency measurement) method or T (survey cycle) the method measuring and calculating speed of a motor vehicle, directly shows in digital mode.
More than, be domestic and international electronic vehicle speed table technology and present situation.Because the electronic vehicle speed table of the fast mode of above-mentioned different meters respectively has merits and faults, so be mainstream technology in which way, international automobile circle does not have final conclusion yet in a very long time.On the one hand, though the pointer electron average speed indicator does not possess the digital electronic average speed indicator in the speed information collection, data storage such as reads at the aspect advantage, and is practical reliable, and speed sense and view effect are good, enjoys the chaufeur favor; On the other hand, the existing automobile-used Hall element output of technology pulse count can't increase substantially under the situation, the digital electronic average speed indicator digital display that causes lags behind unstable, defectives such as measuring accuracy difference exist always, the trend to such an extent as to come to a halt over past ten years, China introduces Shanghai " Buick " car and Guang Zhou " Accord " car of producing from the U.S., Japan as late nineteen nineties, all is pointer electron average speed indicator (only mileage is that liquid crystal digital shows).
For a change pointer-type is difficult to the present situation of having complementary advantages with the discrete meter speed of digital electronic average speed indicator, in the recent period, " the electronic spedometer gauge outfit that a kind of analog/digital has both " (China Patent No.: 99215805.2), the simulation vehicle speed value with the pointer indication of success is converted to cooresponding digital quantity vehicle speed value, having solved long-standing speed of a motor vehicle digital display jumps, flicker, the unstable difficult problem of numeric display, but on its conversion technique scheme, its speed of a motor vehicle measuring accuracy also can only remain on the measurement standard of pointer, the precision problem of speed of a motor vehicle digitalisation aspect still can not be resolved from basic aspect.
The purpose that a kind of inteligent type electronic speed meter for vehicle of the present invention proposes, be to optimize the vehicle speed pulse counting, improve on the speed of a motor vehicle measuring accuracy basis, directly vehicle speed pulse is treated to speed of a motor vehicle number, through D/A mode corresponding conversion is the speed of a motor vehicle scale value of needle deflection to indication, and then it is parallel with pointer to reach in the average speed indicator system speed of a motor vehicle digital display of realizing being digitized as with the speed of a motor vehicle agent technology, the fast synchronous inteligent type electronic speed meter for vehicle of meter.
Be the above-mentioned purpose that realizes that the present invention proposes, the present invention is on magnetic inductive car speed sensor-Hall element of selecting for use, employing is under the difference moment speed of a motor vehicle, whenever shared time and the speed of a motor vehicle relation of being inversely proportional between two Hall square-wave signals links to each other, the Hall square-wave signal that utilization changes with the speed of a motor vehicle goes to modulate the signal source pulse of a known fixed frequency, the signal source pulse number of being modulated between two Hall square-wave signals linking to each other is as the vehicle speed pulse count value, by micro controller system with after the count value input, by lookup table mode (in signal source pulse number of being modulated and speed of a motor vehicle corresponding tables 0-220km/h or the higher prior writing system of speed of a motor vehicle scaled value among the ROM), converse corresponding speed of a motor vehicle numerical value, the speed of a motor vehicle numerical value that converts is outputed to liquid crystal display circuit, realize that the digitalisation of the speed of a motor vehicle shows; Meanwhile, in the single chip circuit system, another one also write in advance with the corresponding speed of a motor vehicle of its count value/volt meter scale value corresponding tables, then can search and draw needle deflection to corresponding vehicle speed value angle required voltage value.This voltage value is driven the magneto-electric gauge outfit of the inner supporting band pointer structure of inteligent type electronic speed meter for vehicle through digital-to-analog voltage changer (D/A change-over circuit), perhaps, write in advance with the corresponding speed of a motor vehicle of vehicle speed pulse count value/volt meter scale value corresponding tables, also can be one and the corresponding speed of a motor vehicle of vehicle speed pulse count value/amperemeter/ammtr scale value corresponding tables writing in advance, the required current value of its needle deflection, then, realize purpose proposed by the invention through a current mode D/A change-over circuit conversion driving gauge outfit.
Because the present invention is in collection, the seizure of vehicle speed pulse information, there is new design the Velocity Updating aspect that also is vehicle speed pulse, increased substantially this difficult problem of a specified duration and unsettled of speed of a motor vehicle measuring accuracy, thereby solve existing digital speedometter speed of a motor vehicle digital display stability, continuity, real-time from basic aspect poor, and speed reads defectives such as hysteresis.Like this, the present invention is parallel with pointer and digital display that the speed of a motor vehicle is digitized as agent technology, the inteligent type electronic speed meter for vehicle that meter speed is synchronous, except that satisfying the preference and conventional requirement of chaufeur to pointer, the speed digitalisation average speed indicator system inner joint, more can implement the expansion that is connected with car body inside and outside control signal, adapting to safe, the monitoring of following intelligent expressway, management aspect, can bring into play more importantly acting on especially.
Below in conjunction with accompanying drawing the present invention is elaborated:
Fig. 1 is modulating waveform figure of the present invention
Fig. 2 is a principle of work block diagram of the present invention
Fig. 3 is a circuit logic schematic diagram of the present invention
According to Fig. 1 modulating waveform figure, it is as follows to make a concrete analysis of the principle of design of introducing a kind of inteligent type electronic speed meter for vehicle of the present invention.
Among Fig. 1, a succession of square-wave signal that Fig. 1 (1) wave mode is sent when running car for existing Hall element.This square-wave signal is by the Hall element output of being satisfied with the automobile gearbox output shaft.The Hall element that the present invention selects for use sends eight vehicle speed pulse signals when the output shaft of gear-box revolution moves a week, when automobile do not stop cover one kilometer distance the time, generally export 4127 pulses (can change magnet steel quantity in sensor or the output shaft housing according to output shaft modulus and needs) altogether to increase certain pulse count.Calculate measured frequency (M) method of the speed of a motor vehicle according to the pulse count of set time inner sensor output, the functional relation of Fig. 1 (1) square-wave signal and the speed of a motor vehicle should be N=K * V (V be the representative automobile 0,1,2,3 ... the 220km/h vehicle speed value; K is the automobile pulse number that Hall element sends when unit velocity 1km/h; The N counted number of pulses that to be Hall element send during for V in the speed of a motor vehicle).Obviously, with said method and functional relation, when automobile was walked with 1km/h speed, its N value also was 4127 pulses.By present technology, digital speedometter needed in per 0.3 second to detect once the time speed of a motor vehicle calculate, in this moment speed of a motor vehicle counting machine still no pulse enter counting; Even according to survey cycle (T) the method measuring and calculating of measuring the used time of fixed pulse period, under the speed of a motor vehicle state of low speed (1km/h) like this, the next pulse signal also arrives in the Hall element at this moment, in addition the special vehicle speed sensors that is used for the digital electronic average speed indicator more requires the moving impulse singla that need export at least in a week more than 20 of sensor revolution as the car speed sensor that has magnetic resistance unit (MRE).So the traditional Hall square-wave signal of Fig. 1 (1), comprise above-mentioned special vehicle speed sensors, the speed of a motor vehicle digitalisation measuring accuracy that all is difficult to solve present existence is poor, and particularly the high regime of the low speed segment of M method or T method measuring and calculating error is bigger.
For this reason, Fig. 1 of the present invention in the Hall impulse singla with the signal modulation system, comprise employing under the different instantaneous speed of a motor vehicle, whenever link to each other between two Hall impulse singlas shared its time period of asynchronism(-nization) and the speed of a motor vehicle are inversely proportional to that fast [relational expression is: (V is this moment vehicle speed value of living in to T=3600 ÷ K ÷ V to the relation meter; Pulse number when K is unit velocity 1km/h; The 3600th, with unit of time by the constant that hour is changed to second)], all be for solving the method that problem that traditional step-by-step counting measuring and calculating aspect exists is taked.Specific design and method continue to be explained by Fig. 1.
Fig. 1 (5) wave mode is modulated pulse wave signal for the present invention, and this signal is modulated between positive rise Fig. 1 (3) of Hall impulse singla and falling edge Fig. 1 (2) and produced.Among Fig. 1, the Hall pulse that utilization of the present invention changes with the speed of a motor vehicle goes to modulate the signal source pulse (wave mode such as Fig. 1 (4)) of a known fixed frequency (60kHz), this signal source pulse is with the pulsed quantity advantage of high-frequency high stability, for the precision counting of vehicle speed pulse count value of the present invention provides sufficient assurance.So far, be subjected to modulating pulse wave with what the speed of a motor vehicle changed shown in Fig. 1 (5), and the present invention is shown by modulating pulse wave design-calculated up-to-date technology for being suitable for: when vehicle is in a certain vehicle speed value V
1Or V
2Or V
3The time, the interpulse period of Hall element output, also determined to be subjected to accordingly the pulse N of frequency of modulation pulse
1Or N
2Or N
3Number; Opposite, if the pulse number of how much having been modulated is arranged between known two Hall impulse singlas, then can instead extrapolate its corresponding speed of a motor vehicle numerical value, thereby actv. solves and influences digital speed of a motor vehicle measuring accuracy because of car speed sensor output pulse count is restricted.
Then, with Fig. 2 principle of work block diagram, implementation method of the present invention is described again.
Fig. 2 among Fig. 2 (1) is the automobile gearbox output shaft.The Hall element that the present invention selects for use (2) is satisfied with on the output shaft of gear-box, produces the different frequency electric impulse signal that changes with the speed of a motor vehicle.That is to say, when the speed of a motor vehicle is invariable, the electric impulse signal of a fixed frequency of Hall element output, the shared time period is identical between two pulse; When the speed of a motor vehicle improves, impulse rate is increased, then the shared time period diminishes between two pulses; On the contrary, when the speed of a motor vehicle reduced, impulse rate reduced, and the pulse spacing strengthens.
To as the Hall electric impulse signal of speed of a motor vehicle transducing signal after pulse shaping circuit (3) shaping, isolate end signal of a commencing signal by on-off signal separation circuit (4).
Wherein: commencing signal occurs in the position of super beginning in two pulse spacings, and end signal occurs when a back pulse in two pulse spacings arrives.
Signal source (5) conduct is subjected to modulating frequency (seeing Fig. 1 (4)), its frequency values known (60kHz), and after the hall sensing pulse frequency modulation, be input in the counting circuit (6).Counting circuit is subjected to on-off signal control and begins counting, stops counting after danger signal arrives.So, just having formed between two pulses of Hall element all has a corresponding count value, and promptly Fig. 1 (5) is subjected to the modulating pulse wave count value.Micro controller system (7) in the pass signal while reporting system of switch separation circuit output by the digital readout that micro controller system is added up counting circuit, is removed this counting machine content by reset signal, subsequently so that carry out the statistics of next recurrent pulse number.
Among Fig. 2, after micro controller system is imported count value, can converse corresponding speed of a motor vehicle numerical value easily by lookup table mode, speed of a motor vehicle numerical value is outputed to liquid crystal display circuit (8) realize that the digitalisation of the speed of a motor vehicle shows, simultaneously in Single Chip Microcomputer (SCM) system, utilize count value to look into the another one speed of a motor vehicle/voltage corresponding tables, the simulation list index of can sening as an envoy to deflects into corresponding vehicle speed value angle required voltage numerical value.Convert this numerical value the output of to relevant voltage value by digital-to-analog voltage changer D/A change-over circuit (9) and drive simulation list index (10) indication speed of a motor vehicle scale value.
Attached: it is as follows to represent the pulse count of speed of a motor vehicle numerical value to convert the computing formula and the working process of the speed of a motor vehicle and aanalogvoltage to:
At first can draw mapping table between one group of vehicle velocity V and the count value N by formula N=3600 ÷ 4127 ÷ V * 60000 (60kHz), be stored in the single chip circuit, count value N of later every input just can find vehicle speed value easily.As: when vehicle velocity V was 1km/h, count value N was 52337 pulses.Below by formula calculate and analogize, then:
Vehicle velocity V=2km/h: modulated pulse count N=26169
Vehicle velocity V=3km/h: modulated pulse count N=17446
Vehicle velocity V=4km/h: modulated pulse count N=13084
Vehicle velocity V=5km/h: modulated pulse count N=10467
Vehicle velocity V=6km/h: modulated pulse count N=8723
……
Vehicle velocity V=219km/h: modulated pulse count N=239
Vehicle velocity V=220km/h: modulated pulse count N=238
(the whole table of mapping table slightly).
(wherein Uout is the magnitude of voltage that drives the deflection of simulation list index according to formula Uout=Vp ÷ 220 * V in addition; Required maximum deflection voltage when Up is the max speed 220km/h; V is this moment speed of a motor vehicle numerical value), calculate a pulse count N and the corresponding relation table of deflection voltage again, also deposit in the single chip circuit, simply table look-up, output to the D/A circuit for micro controller system and carry out the conversion driving, can obtain the speed of a motor vehicle scale value of pointer indication.
Vehicle velocity V=1km/h: deflection voltage Uout=0.011 volt
Vehicle velocity V=2km/h: deflection voltage Uout=0.023 volt
Vehicle velocity V=3km/h: deflection voltage Uout=0.034 volt
Vehicle velocity V=4km/h: deflection voltage Uout=0.045 volt
Vehicle velocity V=5km/h: deflection voltage Uout=0.057 volt
Vehicle velocity V=6km/h: deflection voltage Uout=0.068 volt
……
Vehicle velocity V=219km/h: deflection voltage Uout=2.489 volt
Vehicle velocity V=220km/h: deflection voltage Uout=2.500 volt
(the whole table of mapping table slightly).
If adopt the current drives mode, can (wherein Iout be the current value that drives the deflection of simulation list index according to formula Iout=Ip ÷ 220 * V; Required maximum deflection electric current when Ip is the max speed 220km/h; V is this moment speed of a motor vehicle numerical value), calculate a pulse count N and the corresponding relation table of deflection current again, also deposit in the single chip circuit, simply table look-up, output to a current mode D/A circuit for micro controller system and carry out the conversion driving, can obtain the speed of a motor vehicle scale value of pointer indication.
Vehicle velocity V=1km/h: deflection current Iout=0.136 milliampere
Vehicle velocity V=2km/h: deflection current Iout=0.273 milliampere
Vehicle velocity V=3km/h: deflection current Iout=0.409 milliampere
Vehicle velocity V=4km/h: deflection current Iout=0.545 milliampere
Vehicle velocity V=5km/h: deflection current Iout=0.682 milliampere
Vehicle velocity V=6km/h: deflection current Iout=0.818 milliampere
Vehicle velocity V=219km/h: deflection current Iout=29.863 milliampere
Vehicle velocity V=220km/h: deflection current Iout=30.000 milliampere
(the whole table of mapping table slightly).
Certainly, also how adopt other method of calculating, obtain the speed of a motor vehicle and outputting drive voltage or current value, such as direct computing method.Promptly by formula
N=3600 ÷ derives the speed of a motor vehicle in 4127 ÷ V * 60000---and the functional relation of pulse count is
V=3600 ÷ 4127 * 60000 ÷ N through simplify V=52338 ÷ N.Micro controller system is modulated pulse count N according to the sampling input of phase weekly, just can directly calculate cooresponding vehicle speed value V with division routine.
At last, in conjunction with Fig. 3 circuit logic schematic diagram, further full and clear realization detail of the present invention.
In Fig. 3, the X1 plug is this circuit and the interface of Hall element, and its 1: 3 for the Hall car speed sensor provides operating voltage+12V and ground, and 2 is the signal output part of Hall car speed sensor.
Resistance R 1 connects the mouth of Hall car speed sensor, to reach the effect of voltage matches.Resistance R 2, R3 make aerotron V1 reach suitable amplification operation point, make the signal shaping of Hall car speed sensor output amplify the square-wave pulse signal that is matched to standard TTL logic.
D1:74121 is a monostable multivibrator, and its effect is that the duty time of TTL logic square wave is fixed, to avoid because the irregular problem of square wave width of the transducing signal that just forms of the speed of a motor vehicle.Its duty time, can be by parameter setting and the adjustment of element R4 and C1.The pulse with speed of a motor vehicle variation of Hall car speed sensor output, the standard TTL logic square-wave signal that after R2, R3 and aerotron V1 effect, forms, after being input to the ACK end of D1:74121, just form identical a string square-wave signal of duty time, its waveform such as Fig. 1 (1).
D2:A and D2:B are two parts of the two monostable multivibrators of same 74LS221, and this element and D1:74121 monostable multivibrator function are identical.Wherein, the purposes of D2:A is when the positive rise of the square wave of D1:74121 output, produces a narrower negative level pulse as danger signal (STOP), and its pulse width is determined by the parameter of R5 and C2, (2) of waveform such as Fig. 1; And the purposes of D2:B is when the falling edge of the square wave that D1:74121 is exported, and produces a narrower positive level pulse, and as actuation signal (START), its pulsewidth is by the parameter decision of R6 and C3, (3) of waveform such as Fig. 1.
D3:74LS74 produces unlatching, closing signal starting (START) and stopping under the effect of (STOP), opens a control gate D4:A74LS08.Opening (START) and closing between (STOP) two signals, control gate D4:A74LS08 opens, and all the other times close.
D7:89C52 is a micro controller system, and the timer in its sheet can be provided with a repeated freqnency signal very easily, exports on the P10/T leg by it, selects to allow it export the signal of a 60KHz frequency herein, as the frequency source of counting with clock.(4) of its waveform such as Fig. 1.
D8:A, D8:B74LS393 are one 8 binary counters, D9:A, D9:B74LS393 are 8 binary counters, this counting machine of two 8, be combined into one 16 counting machine, to starting (START) and the 60KHz frequency source signal-count statistics of the output that stops to open the door between (STOP), (5) of this signal waveform such as Fig. 1, its maximum count value are 65535, can satisfy the maximum count amount of Hall car speed sensor when minimum speed of a motor vehicle 1km/h.
End end in each square wave count cycle produces danger signal (STOP), this signal not only will be closed the D4:A74LS08 control gate, and make micro controller system D7:89C52 produce interruption (INTO), the count value that the notice computing machine can be got two counting machines, micro controller system the numerical value that two counting machines of D8, D9 are added up read finish after, send a reset signal (CLEAR) to them, will wait for the counting statistics work of doing following one-period after start signal (START) arrives again after these two counter O resets.
Micro controller system is after each unlatching, closing end cycle, the count value that utilization is read, search counted number of pulses in the micro controller system storage inside---speed of a motor vehicle relation table, can find out corresponding speed of a motor vehicle numerical value corresponding to this moment, above program loop is reciprocal, has then realized the digitalisation work of the real-time speed of a motor vehicle.
Micro controller system D7:89C52 selects a titer crystal display Disply:TM82A by decoding circuit Decoder, digitized speed of a motor vehicle numerical value is shown, and drive a D/A changer D5:AD5310 simultaneously, the required magnitude of voltage of deflection when converting digitized vehicle speed value the indication of to simulation table again, form suitable voltage amplifier (or galvo amplifier) driving spider coil analog meter through an amplifier D6 and resistance R 7, drive pointer, realize a kind of inteligent type electronic speed meter for vehicle that speed of a motor vehicle digital display of the present invention and pointer are parallel, meter speed is synchronous.Illustrate: 1. the selection of the frequency values of standard frequency source can be by the design alternative of gauge outfit the max speed value, importantly guarantee to make the speed of a motor vehicle when maximum, modulated pulse count and still can be distinguished two adjacent speed of a motor vehicle numerical value, and make the speed of a motor vehicle hour, modulated pulse count and be no more than the maxim (as: 16 powers 65536 of 2) that counting machine can be added up.2. when the present invention calculates vehicle speed value, because micro controller system limited in one's ability, so at first select look-up table to calculate numerical value such as the speed of a motor vehicle.Like this, can guarantee that maximum speed in the cycle, finishes all evaluation works.If select more powerful DSP (digital signal processor), such as: TMS320C2X, just can preferentially select direct computing method, but its cost is higher relatively, so selecting not to be subjected to Fig. 3 to indicate model, the micro controller system model limits.3. no matter use the sort of method to calculate, all will consider the fugitiveness that the sensor shake causes.When using look-up table, but enlarged area.Such as, N=8723 is that the speed of a motor vehicle is 6km/h, when tabling look-up, that can consider to import is modulated pulse count whether between 8700～8750, if think that then the speed of a motor vehicle is 6km/h; When using method of calculation, can add correction.Such as, the pulse count of being modulated of input is 8708, calculates according to formula V=3600 ÷ 4127 * 60000 ÷ N, V=6.45, go into method with 4 houses 5 and can simply choose V=6,, guarantee that the increment that the speed of a motor vehicle changes is no more than " ± 1 " so that under software damping adjusting control.4. it is a kind of that the Hall element selected for use of the embodiment of the invention belongs in the magnetic inductive car speed sensor general-duty, and other magnetic inductive one class car speed sensor also is applicable to enforcement that the present invention adopts.As: the magnetic inductive car speed sensor that is used for the tooth-like structure of output shaft interface band; The car speed sensor that has magnetic resistance unit (MRE), the vehicle speed pulse signal of its output is after existing technology is shaped as square wave, and all available principle of the present invention and method are implemented.External mode also can be adopted in (principle and method are identical with the employing Hall element, slightly) pulse duration frequency signal 5. of the present invention source, and its effect and effect are identical during with employing micro controller system internal clocking frequency source.
Claims (5)
1. inteligent type electronic speed meter for vehicle that is used for automobile-uses such as automobile, motor bike, train, this average speed indicator is made up of car speed sensor, Liquid Crystal Display (LCD), pointer magnetoelectricity gauge outfit, micro controller system and electronic circuit, it is characterized in that:
---be used for the vehicle speed pulse signal of vehicle speed pulse counting, be modulated by a class magnetic inductive car speed sensor square-wave signal such as Hall car speed sensor, and the speed of the pulse count reflection vehicle of being modulated between two square-wave signals to link to each other;
---vehicle speed pulse count value N that vehicle speed pulse count value N that of writing in advance changes with the speed of a motor vehicle and the mapping table between the vehicle velocity V and one changes with the speed of a motor vehicle and the corresponding relation table of needle deflection magnitude of voltage U are arranged in the micro controller system or be stored in the ROM system with the vehicle speed pulse count value N and the corresponding relation table of needle deflection current value I of speed of a motor vehicle variation;
---Liquid Crystal Display (LCD) and the fast magnetoelectricity gauge outfit of parallel meter, the identical vehicle speed pulse counting that changes with the speed of a motor vehicle is all arranged, this count value is by rolling counters forward, the input micro controller system converts, from micro controller system output via decoder for decoding and drive the digital signal of the liquid crystal display displays speed of a motor vehicle, simultaneously, also corresponding output is changed via D/A converter, is used to drive the speed of a motor vehicle electric signal of needle deflection.
2. according to the described average speed indicator of claim 1, it is characterized in that: the described vehicle speed pulse count value that is used to reflect the speed of a motor vehicle, be pulse signal source number of pulses and the speed of a motor vehicle relation of being inversely proportional to that links to each other and to be modulated between two signals by the Hall square-wave signal, and calculate the speed of a motor vehicle with T=3600 ÷ K ÷ V formula;
3. according to the described average speed indicator of claim 1, it is characterized in that: the magnetoelectricity gauge outfit parallel with Liquid Crystal Display (LCD), can be scaled by the vehicle speed pulse count value of representing the speed of a motor vehicle and drive the required voltage value of needle deflection, also can be scaled and drive the required current values of needle deflection, be converted to relevant voltage value or the current value that drives pointer indication and Liquid Crystal Display (LCD) synchrometer speed by a numeral/aanalogvoltage changer or digital-to-analog power pack respectively again;
4. according to the described average speed indicator of claim 1, it is characterized in that: specific pulse count was carried out special-purpose pairing or selected to the Hall element flat thin magnet when described Hall element can rotate a circle according to automobile output shaft modulus or output shaft;
5. according to claim 1 or 2 or 4 described average speed indicators, it is characterized in that: a described pulse signal source that is subjected to the modulation of Hall square-wave signal can be a suitable frequency signal selecting setting in the micro controller system timer;
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| Application Number | Priority Date | Filing Date | Title |
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| CNB001246887A CN1136453C (en) | 2000-09-29 | 2000-09-29 | Inteligent type electronic speed meter for vehicle |
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| CNB001246887A CN1136453C (en) | 2000-09-29 | 2000-09-29 | Inteligent type electronic speed meter for vehicle |
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| CN1136453C CN1136453C (en) | 2004-01-28 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1862233B (en) * | 2006-04-12 | 2010-08-18 | 贵州省电子产品监督检验所 | Analogue speed signal generator |
| CN102221630A (en) * | 2010-04-16 | 2011-10-19 | 上海森太克汽车电子有限公司 | Adaptive speed sensor and signal duty ratio correction method |
| CN103578389A (en) * | 2013-11-06 | 2014-02-12 | 四川金网通电子科技有限公司 | Compatible liquid crystal instrument and implementation method thereof |
| CN103675327A (en) * | 2012-09-17 | 2014-03-26 | 泰州市双宇电子有限公司 | Vehicle speed detection method |
| CN104535095A (en) * | 2014-12-04 | 2015-04-22 | 苏州欣航微电子有限公司 | Novel waterproof thermal-insulation liquid crystal instrument of electric car |
| CN105857080A (en) * | 2015-02-09 | 2016-08-17 | 德尔福技术有限公司 | Vehicle instrument panel with pointer presence detection |
| WO2018133067A1 (en) * | 2017-01-22 | 2018-07-26 | 江门市江海区精工摩托车配件有限公司 | Motorbike dashboard |
| CN108909455A (en) * | 2018-07-20 | 2018-11-30 | 安徽江淮汽车集团股份有限公司 | Digitize speed display methods and system |
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2000
- 2000-09-29 CN CNB001246887A patent/CN1136453C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862233B (en) * | 2006-04-12 | 2010-08-18 | 贵州省电子产品监督检验所 | Analogue speed signal generator |
| CN102221630A (en) * | 2010-04-16 | 2011-10-19 | 上海森太克汽车电子有限公司 | Adaptive speed sensor and signal duty ratio correction method |
| CN103675327A (en) * | 2012-09-17 | 2014-03-26 | 泰州市双宇电子有限公司 | Vehicle speed detection method |
| CN103578389A (en) * | 2013-11-06 | 2014-02-12 | 四川金网通电子科技有限公司 | Compatible liquid crystal instrument and implementation method thereof |
| CN103578389B (en) * | 2013-11-06 | 2016-02-10 | 四川金网通电子科技有限公司 | Compatible liquid crystal instrument and its implementation |
| CN104535095A (en) * | 2014-12-04 | 2015-04-22 | 苏州欣航微电子有限公司 | Novel waterproof thermal-insulation liquid crystal instrument of electric car |
| CN105857080A (en) * | 2015-02-09 | 2016-08-17 | 德尔福技术有限公司 | Vehicle instrument panel with pointer presence detection |
| WO2018133067A1 (en) * | 2017-01-22 | 2018-07-26 | 江门市江海区精工摩托车配件有限公司 | Motorbike dashboard |
| CN108909455A (en) * | 2018-07-20 | 2018-11-30 | 安徽江淮汽车集团股份有限公司 | Digitize speed display methods and system |
| CN108909455B (en) * | 2018-07-20 | 2020-11-03 | 安徽江淮汽车集团股份有限公司 | Digital vehicle speed display method and system |
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| CN1136453C (en) | 2004-01-28 |
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