CN101344990A - Intervention type active speed limiting control device of motor vehicle - Google Patents

Abstract

The invention provides an active speed limit controlling device of motor-vehicle-involved mode, aiming at solving passiveness and limitation which are introduced by the traditional 'electronic eye' speed detecting method and the novel method of 'interval speed detection' in the detection of an over-speed vehicle on a freeway. The active speed limit controlling device comprises an emission source of a speed-limited value signal, a vehicle-bone signal receiver, a Hall sensor, a speed limit indicator and a circuit thereof, an over-speed alarming circuit, a switch circuit of an electronically-controlled accelerating pedal and components thereof, a single-chip speed controlling software and so on. The emission source is arranged under or on the ground of the entrance of a freeway, with different pulse frequencies representing different vehicle speed limit values. When the vehicle exceeds the speed limit, the system device emits an over-speed alarming signal, and the driver needs to decelerate by self, otherwise, at the end of the alarm, the accelerating pedal does not take effect to the oil-supplied control instantly, and recovers after automatically decelerating the vehicle to a given value in a punishing way. The active speed limit controlling method and the process thereof are carried out repeatedly, which leads the vehicles to be driven in order, reduces the occurrence of traffic jam, and prevents a traffic accident which is easily caused by over-speed.

Description

Intervention type active speed limiting control device of motor vehicle

Technical field:

The present invention relates to the travel device of insertion type speed of a motor vehicle control of automobile overspeed, more particularly, relate to the expressway traffic safety management and go up the driving vehicle that exeeds the regulation speed is implemented the initiatively device of speed of a motor vehicle Control for Speed Limitation.

Background technology:

At present, speed of a motor vehicle management and control on the highway, being mainly traffic safety management department needs crossing, speed limit highway section to set up obvious speed(-)limit sign in the direction board mode at highway, and the vehicle that enters the speed limit highway section is carried out the prompting of warning speed limit.Several standard of the limited speed such as the 120km/h that stipulates on China's traffic law, 110km/h, 100km/h, 80km/h are mainly looked highway different brackets or place environment road conditions and are set, and countries in the world are also like this substantially.At some complexity and special road section, China big and medium-sized cities and coastal economy developed regions, also " electronic eyes " speed measuring device that adopts fixed point to be provided with exceeds the speed limit in violation of rules and regulations and drives to be subjected to the comparatively severe economic penalties of vehicle supervision department.The concrete speed limit control measures of above-mentioned traffic law and traffic safety management department, be passive type speed of a motor vehicle method for managing and monitoring, have the limit except that technical, its effect and effect also are subject to artificial factor and interference, as some local hidden fixed point " electronic eyes " speed-measuring methods that constantly occur are just controversial in the recent period, on the one hand, in a single day publicity fixed point velocity measuring technique has crossed one kilometer scope that tests the speed in addition of speed measuring point radius because of tested vehicle, the motorist just can be exceeded the speed limit and be driven to be difficult to can penalize on evidence, on the other hand, motorist's random hypervelocity and anti-monitoring phychology also cause the generation of problem such as traffic hazard easily.For solving the monitoring and anti-monitoring confusion phenomena that recent " electronic eyes " tests the speed and occur, a kind of " testing the speed in the interval " new technology, promptly in certain highway section, judge the vehicle method that whether exceeds the speed limit according to vehicle ' average velocity, China Guangdong Province also takes the lead in carrying out at wide dark fastlink inside the province from declaration in 2007.Should " testing the speed in the interval " method seem to strengthen than the fairness that tests the speed on " electronic eyes " point, transparency, but still do not break away from the passive management monitor mode of technological lag, and interval interior former many group refuelings, maintenance, food service industry that " testing the speed in the interval " relates to must be included parking timer supervision or interval outer reconstruction problem in, thereby the complicacy and the difficulty of system monitoring have been increased, at least, vehicle parking time in it is interval, will become the motorist to set out on a journey again can arbitrarily to exceed the speed limit the time more than needed of driving and lose the essential meaning of " testing the speed in the interval ".At present, but abroad except that the monitoring of the direct track and localization of the special highway special car of minority satellite, yet there are no a large amount of normal domestic highways are implemented ACTIVE CONTROL and management to over-speed vehicles device.

Summary of the invention:

The present invention aims to provide and a kind ofly can implement the initiatively motor vehicle intervention type active speed limiting device of speed of a motor vehicle monitoring to the driving vehicle that exeeds the regulation speed on the highway, to overcome not enough and difficult in the management of existing technology and present expressway traffic safety.

Intervention type active speed limiting control device of motor vehicle of the present invention, at first be based on following principle and method innovation and creation: underground or porch at the highway crossing, place an electromagnetic pulse signal emissive source, speed of a motor vehicle speed limit numerical value according to different highway sections speed limit direction board indicates sends the different frequency pulse of representing this speed limit; On motor vehicle, be equipped with electromagnetic pulse signal receiver and corresponding treatment circuit.When the vehicle detection of passing by behind electromagnetic pulse signal, system transforms reduction with signal, draw the speed limit numerical value of this highway section to Vehicle Speed, with vehicle current driving velocity ratio, in case the speed of a motor vehicle surpasses this speed limit numerical value, then the control signal of onboard system output automatically the Control of Automobile fuel oil force vehicle deceleration normally for amount, to reach purpose to motor vehicle active Control for Speed Limitation.

Be satisfied with the underground electromagnetic pulse signal emissive source in fastlink porch, the setting of its pulsed frequency can simply be set according to the speed limit value corresponding, and promptly speed limit is 100 kilometers/hour, and frequency is exactly 100 hertz etc.In order to improve reception reliability, the vehicle that faster passes through shortens time of reception so that also can obtain speed-limiting messages reliably, then pulsed frequency can be set according to certain multiple of speed limit, when setting by 10 times, when speed limit is 100 kilometers/hour, frequency is exactly 1kHz (promptly 1000 hertz); 120 kilometers/hour of speed limits, frequency is exactly 1.2kHz etc., and all the other are by that analogy.On behalf of 100 kilometers/hour speed limit setting values, the specific embodiment of the invention will explain with 1kHz.

On motor vehicle, a cover electronic control system is installed, vehicle-mounted electromagnetic pulse signal receiver, Hall vehicle speed pulse signal source, speed limit indicator and circuit, overspeed alarming circuit, automatically controlled accelerator pedal on-off circuit and assembly thereof etc. are arranged in the system.So-called automatically controlled accelerator pedal on-off circuit and assembly, a cover makes the throttle drag-line break away from the electric control gear of accelerator pedal interlock exactly, this device allows throttle drag-line and accelerator pedal be in linkage status at ordinary times, when automatically controlled accelerator pedal module is in speed limit startup and executing state, the interlock of throttle drag-line and accelerator pedal is broken away from, make engine idling operation, motor vehicle speed is reduced, when the speed of a motor vehicle drops to setting speed of a motor vehicle numerical value, again recover the interlock of accelerator pedal and throttle drag-line, thereby realize purpose below speed limit is fallen in motor vehicle speed.

Be installed on the electromagnetic pulse signal receiver of motor vehicle bottom, constitute by electromagnetic induction elements such as magnetic induction coils, its effect is that the inductive impulse conversion of signals is become electric impulse signal, electric impulse signal becomes standard TTL logic level signal through amplifying the shaping match circuit with conversion of signals, be input on the outside input port of a private counter of single-chip microcomputer, with a private counter of corresponding single-chip microcomputer inside; The inner timer in addition of single-chip microcomputer, at system acquisition behind electromagnetic pulse signal, begin to start this timer, in a regular time section, such as the select time section is 0.1 second, in this time period, even the motor vehicle of rapid movement very, the signal that receives the electromagnetic pulse signal emissive source also can be distinguished effectively by system; Surpass 3 above electromagnetic pulse signal Transmission Time Interval and receiver does not receive electromagnetic pulse signal in system, then system can confirm that vehicle has passed through this electromagnetic pulse signal emissive source scope; After passing through electromagnetic pulse signal emissive source zone, system begins speed-limiting messages is handled, and calculates the concrete speed limit numerical value in this speed limit highway section.

When the signal source transmission frequency was 1kHz, in 0.1 second, one group of electromagnetic pulse number that vehicle can receive was 100 (number of pulses that receives in per 0.1 second just is referred to as one group); If the speed of a motor vehicle is very fast, when vehicle passes through so, can receive the pulsegroup number of small number slightly; If the speed of a motor vehicle is very slow, when vehicle passes through so, will receive a lot of groups of same number pulses; If the speed of a motor vehicle is extremely slow, when vehicle passes through so, can receive more groups of same number pulses, Gu need only 3 promptly 0.3 second time periods of work in the Single Chip Microcomputer (SCM) system, then, single-chip microcomputer is in the particular memory location of speed limit value storage in its sheet that calculates, the foundation that speed limit is handled during as later vehicle '; This storage unit after vehicle enters other highway section, can be replaced by the new speed limit numerical value of other electromagnetic pulse signal emissive source emission and upgrade.Above process after single-chip microcomputer obtains above-mentioned speed limit requirement, all can be done a hexadecimal data 5A mark and light-emitting diode flash external label in inside, so that whether single-chip microcomputer can exceed the speed limit in the software program for execution judgement.

Hall vehicle speed pulse signal source (the vehicle speed pulse signal that the motor vehicle gearbox output shaft is gathered), comprise Hall element, coupling and amplifying circuit etc., the vehicle speed pulse signal of its output TTL logic level, input port interface with single-chip microcomputer, utilize the software routines of inner this pulse signal of special disposal of single-chip microcomputer, by measured frequency method or survey periodic method, just can calculate the current travel speed value of vehicle, and with the speed of a motor vehicle numerical value that calculates, in the inner fixing storage unit of single-chip microcomputer, store, upgrade, later on software just can this numerical value, compares with speed limit numerical value, thereby draw hypervelocity whether conclusion.

After program has detected the speed limit mark, the flash of light of speed limit indicator, and begin vehicle current driving speed and speed limit are compared, if when finding current vehicle speed greater than speed limit, control signal of single-chip microcomputer output, open hummer sound and report to the police, remind the present vehicle of driver to be in the state of driving over the speed limit, should slow down immediately; Simultaneously, single-chip microcomputer starts a timer, after the time of driving over the speed limit surpasses this timer timing time, single-chip microcomputer is exported another control signal, start automatically controlled accelerator pedal on-off circuit, disconnect throttle drag-line and accelerator pedal annexation in the automatically controlled accelerator pedal module, the driver is lost utilize accelerator pedal to control the ability of air throttle, engine is in idling mode, therefore motor vehicle speed can reduce, when the speed of a motor vehicle is reduced to the speed of a motor vehicle numerical value of software program setting, single-chip microcomputer disconnects throttle drag-line connection control signal from above-mentioned two delivery outlets output cancellation audible alarm and cancellation again, makes the driver can enter normal vehicle mobility operation state again by accelerator pedal.In addition, the important point agreement is, electromagnetic pulse signal emissive source of the present invention, can launch the specific frequency value of cancellation speed limit, after onboard system receives this characteristic frequency, remove control mark, the cancellation Control for Speed Limitation, occur up to new speed limit, like this, just can realize the speed of a motor vehicle control task of complete traffic link, such as, the electromagnetic pulse frequency of a 3kHz, original this frequency can be represented speed limit 300km/h, but do not have on the domestic and international traffic law of this high speed speed limit, can be as the speed limit of motor vehicles is set in the scm software system, but software systems can be with this frequency, comprise and select to surpass the characteristic frequency numerical value that any one above speed of a motor vehicle numerical value of China's traffic law standard of the limited speed is arranged to cancel speed limit, therefore, after onboard system receives this characteristic frequency numerical value, will cancel at inside and outside set 5AH mark of single-chip microcomputer and light-emitting diode flash mark, program is no longer carried out later on and has been handled software that whether vehicle exceeds the speed limit, and single-chip microcomputer can not judged by accident yet.Launch the electromagnetic pulse signal emissive source of the characteristic frequency of this cancellation Control for Speed Limitation, can be installed on highway end or exit.The above is exactly the intervention control procedure that system initiatively carries out the speed of a motor vehicle, thereby realizes the purpose of motor vehicle intervention type active speed limiting control of the present invention.

In addition, emission receiving unit of the present invention except that adopting electromagnetic pulse emission receive mode, also can adopt FM radio set emission receive mode (concrete grammar explains again, omits temporarily) herein in following specific embodiment.

In sum, content of the present invention specifically comprises:

Described electromagnetic pulse signal emissive source (also can be the frequency modulated radio signal emissive source), being installed on highway needs porch, speed limit highway section underground, this electromagnetic pulse signal emissive source has different variable pulse oscillation frequency, in order to represent different speed of a motor vehicle speed limit numerical value.

The receiver of described electromagnetic pulse signal emissive source is vehicle-mounted electromagnetic pulse signal receiver (also can be vehicle-mounted frequency modulated radio signal receiver).When vehicle passes through porch, speed limit highway section, the electromagnetic pulse signal that vehicle-mounted electromagnetic pulse signal receiver receives induction is handled on the general input of back input single-chip microcomputer, be reduced into speed limit numerical value as calculated, be stored in the storage unit in the single-chip microcomputer sheet.

Another input interface of described single-chip microcomputer with the input signal interface of Hall vehicle speed sensor pulse signal, through the speed of a motor vehicle numerical value that single-chip microcomputer calculates, also is stored in the single-chip microcomputer sheet stored unit.Also have the speed of a motor vehicle Control Software program that writes in advance in the single-chip microcomputer, when Vehicle Speed surpassed the speed of a motor vehicle speed limit of single-chip microcomputer stored, single-chip microcomputer speed of a motor vehicle control circuit can be in time to vehicle output overspeed alarming and the deceleration control signal of driving over the speed limit.

Described automatically controlled accelerator pedal on-off circuit is the control circuit of the automatically controlled accelerator pedal module of control, and this circuit is switched on or switched off the output of 12V power supply according to the scm software programmed instruction; One permanent magnet and electromagnetic core adhesive are arranged in the described automatically controlled accelerator pedal module, when the solenoid in the electromagnetic core has electric current to pass through, the adhesive of permanent magnet and electromagnetic core is thrown off automatically, accelerator pedal is to the ineffective power of motor vehicle gasoline throttle drag-line, make the air throttle return, engine is in idling mode; When the solenoid no current in the electromagnetic core passed through, permanent magnet and electromagnetic core recovered attracting state.

The chimes of doom that described overspeed alarming circuit sends is used for the bulletin vehicle and has been in the state of driving over the speed limit, and the motorist needs to slow down voluntarily, otherwise under the effect of scm software program, system gets involved and forces vehicle to slow down automatically.

Described particular value frequency signal is a cancellation speed limit setpoint frequency signal, and its effect is with the removing of the special sign 5AH mark in the single-chip microcomputer and extinguishes external light-emitting flash of light mark, removes the Control for Speed Limitation to motor vehicles.

Implement beneficial effect of the present invention: (1) reduce test the speed on existing " electronic eyes " point of expressway safety management system with " testing the speed in the interval " supervision on dispute and passive, the generation of the traffic hazard that the driving that can solve effectively that wagon flow that highway faces day by day blocks and the motorist is arbitrarily exceeded the speed limit causes easily reduces personnel's life and property loss; (2) the lifting its people observe rules and obey laws to drive a vehicle and realize, and are beneficial to the development construction of harmonious society, are beneficial to great-leap-forward and promote the existing traffic safety management level of China; (3) this invention technology and technology manufacturing are implemented easily, and social benefit and economic benefit are obvious.

Description of drawings:

Fig. 1 is electromagnetic pulse signal emissive source circuit theory diagrams of the present invention.

Fig. 2 is single-chip microcomputer and vehicle speed control system circuit theory diagrams.This figure is by vehicle-mounted electromagnetic pulse signal receiver (1); Hall vehicle speed pulse signal source (2); Speed limit indicator and circuit (3); Overspeed alarming circuit (4); Automatically controlled accelerator pedal on-off circuit (5) constitutes.

Fig. 3 is automatically controlled accelerator pedal module configuration diagram.

Fig. 4 is a single-chip microcomputer speed of a motor vehicle Control Software process flow diagram.

Fig. 5 is a singlechip interruption subroutine software flow pattern.

Embodiment:

The invention will be further described describes below in conjunction with content of the present invention and accompanying drawing.

Fig. 1 is electromagnetic pulse signal emissive source circuit theory diagrams of the present invention, and JT is the crystal oscillator of a 10MHz among the figure, and FPQ is a CPLD integrated circuit EPM7128STI.In this piece integrated circuit FPQ, the optional frequency frequency divider logic module of utilizing special software MAXPLUS-II establishment is arranged, this frequency divider depends on the frequency selection network of non-essential resistance R3 and SW switch (the actual switch network is rotary-type 9 and selects 1 waver) composition, pulsed frequency with crystal oscillator JT generation, frequency division becomes that to represent speed limit be 9 500Hz～1.3KHz pulsed frequency of 50km/h～130km/h, by waver SW 9 diverse locations of living in, select certain frequency pulse signal of output.Resistance R 1, R2 and triode V1, V2 form amplifying circuit; Electromagnetic pulse is from telefault L1 emission, and V3 releases the recoil electromotive force of telefault L1 as fly-wheel diode, the protection amplifying circuit.Its effect and process are that after the emissive source circuit powered up, the pulse signal that crystal oscillator produces through frequency division, frequency-selecting output, amplification rear drive telefault L1, converted electric impulse signal to the magnetic-pulse signal and is transmitted in the space.The magnetic-pulse that this telefault L1 sends, can pass through a magnetic isolation channel, emitting area is limited in the fixed range, and transmitting range, can be controlled by resistance R 1, the R2 that regulates power amplifying part, to reach the purpose that can well receive the vehicle-mounted electromagnetic pulse signal receiver among Fig. 2.

FPQ forms the frequency dividing circuit mode of operation: 1 pre-frequency division module, divide ratio=100 are with the 10MHz dominant frequency of crystal oscillator JT, and frequency division is the global frequencies source of 100kHz as the further meticulous frequency division of other circuit; The frequency division module of 1 coefficient=200 is the 500Hz frequency of representative 50km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=167 is the 600Hz frequency of representative 60km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=143 is the 700Hz frequency of representative 70km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=125 is the 800Hz frequency of representative 80km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=111 is the 900Hz frequency of representative 90km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=100 is 1000Hz (1kHz) frequency of representative 100km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=91 is 1100Hz (1.1kHz) frequency of representative 110km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=83 is 1200Hz (1.2kHz) frequency of representative 120km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=77 is 1300Hz (1.3kHz) frequency of representative 130km/h with global frequencies source frequency division; The frequency division module of 1 coefficient=33 is 3000Hz (3kHz) frequency of representative cancellation speed limit with global frequencies source frequency division.

Fig. 2 is single-chip microcomputer and vehicle speed control system circuit theory diagrams.Among the figure, vehicle-mounted electromagnetic pulse signal receiver (1) is made the electromagnetic pulse inductor by telefault L2 and diode V4.Wherein the purposes of telefault L2 is the magnetic-pulse signal that coupling electromagnetic pulse signal emissive source is sent from the space; Diode V4 plays the effect of the positive phase electric pulse that extracts telefault L2 coupling output; Resistance R 4 and R5, and triode V5 forms amplification, shaping, match circuit, the positive phase electric impulse signal is realized the saturation limiting amplification through amplification, shaping, match circuit, then in resistance R 5 and triode V5 tie point position, generation meets the TTL logical criteria, and to enter single-chip microcomputer (D:AT89C52) T0 mouth with same frequency pulse signal that transmitter unit sends be to count and calculate on the general I/O port P3.4, can draw the speed limit instruction numerical value that emissive source sends.For example: the current vehicle speed speed limit is 100km/h, the electromagnetic pulse signal emissive source sends 1kHz frequency electromagnetic pulse signal, then vehicle-mounted electromagnetic pulse signal receiver (1) will be imported decoded 1kHz frequency TTL logic pulse signal among Fig. 2, the internal counter of single-chip microcomputer T0 mouth correspondence, number of pulses according to the input of 0.1 second cycle statistics T0 mouth, single-chip microcomputer compares the data that read, consider and need certain redundance, so if data are between 95～105, just represent that present speed limit is 100km/h, if the data of reading are between 85～95, just represent that present speed limit is 90km/h, the rest may be inferred by analogy for it, just evaluation has ± 5 error allowed band, in case the locking system parameter drift, with the speed limit data of calculating, store in the single-chip microcomputer, later on just can with current Vehicle Speed numeric ratio in used.Simultaneously, single-chip microcomputer is portion and outer setting speed(-)limit sign within it also, make the scm software program learn that there is speed limit message in this highway section, and uninterruptedly compare during vehicle is advanced afterwards and judge whether Vehicle Speed exceeds the speed limit, and the speed limit indicator flashing index of outer setting can remind the driver to enter the speed limit highway section.

According to the principle of the invention, after aforementioned single-chip microcomputer inside counting unit has detected restricting signal and enters and make inside and outside standard laid down by the ministries or commissions of the Central Government note, immediately speed of a motor vehicle speed limit numerical value is compared with current vehicle speed, if when finding current vehicle speed numerical value greater than speed limit, single-chip microcomputer will be by software program from the real-time control signal of its output/input port output to the vehicle of driving over the speed limit.Below, elaborate with Hall vehicle speed pulse signal source (2) input vehicle speed pulse and interface microcontroller and computing among Fig. 2 earlier.

The commercialization Hall vehicle speed sensor HR that can obtain on the market has three connecting lines, is respectively+the 12V power lead, ground wire and sensing pulse signal output line.Sensing pulse signal output line generally is open collector (OC) mode delivery outlet, can be connected to by the resistance in the sketch on the power supply of different magnitudes of voltage, with various different application Circuits System couplings, thereby obtain the pulse signal of varying level output mode, among Fig. 2, build-out resistor R6 is connected to+the 5V power supply on, in order to form single-chip microcomputer acceptable 5V pattern TTL logic output pulse signal, this signal is connected on the special-purpose counting input port T1 mouth (also being that adopted name is the P3.5 mouth) of single-chip microcomputer, just can allows scm software calculate vehicle ' real-time speed value by measured frequency or survey periodic method.Explain with measured frequency method and formula below.

After the power supply that Hall vehicle speed sensor HR connects is opened, on sensing pulse signal output line, can export the pulse signal that is directly proportional with the speed of a motor vehicle, satisfy formula M=K * V.M is Hall vehicle speed pulse number (unit is " individual ") in the formula; V is Vehicle Speed (unit is " kilometer/per hour: km/h "); K is the sensor scale factor, (K value is because of different automobile types output shaft of gear-box modulus, sensor number of poles and the wheel diameter difference that varies in size for the number of pulses of the sensor output so that per hour 1 kilometer speed is travelled that is automobile, but its scale factor K is finalized the design for all having when supporting in each vehicle and is demarcated or simple test just can be learnt), during computing this scale factor is changed into and choose corresponding dimension of certain time period.If adopt the measured frequency method, the pass between the speed of a motor vehicle and the umber of pulse is V=M ÷ K, just passes through unit of account in the time, and the variable quantity of the umber of pulse that single-chip microcomputer receives divided by scale factor in this unit interval, can obtain the vehicle speed value in this moment.Such as, certain brand Hall pulse transducer HR, when on certain vehicle, using, its scale factor K=2500, promptly when this car travels with 1km/h, the 1km that so whenever travels, Hall pulse transducer HR will export 2500 pulses; And when this car travels with 10km/h, the 10km that so whenever travels, Hall pulse transducer HR will export 25000 pulses.Conversely, if 25000 pulses are per hour arranged, illustrate that then the present speed of a motor vehicle is exactly 10km/h.When calculating the speed of a motor vehicle, for improving speed of a motor vehicle computational accuracy, obviously can not wait for and just calculate a speed of a motor vehicle numerical value for a long time, therefore chronomere need be changed to 0.1 second by 1 hour, scale factor K=2500/36000 so, then speed of a motor vehicle computing formula is V=M ÷ K==M ÷ 2500 * 36000, and wherein M is a Hall umber of pulse in 0.1 second.Scm software only need be by this formula, with 0.1 second be a time period, constantly calculate, draw Vehicle Speed continuously, this is the input and the speed of a motor vehicle computing method of Hall vehicle speed sensor.

Speed limit indicator among Fig. 2 and circuit (3) are and the simple peripheral web member of single-chip microcomputer, can select to be connected with certain delivery outlet of single-chip microcomputer such as P2.0.There is a nonshared control unit D2:NE555 speed limit indicator inside, can directly drive the V6 light emitting diode and flash; D2:NE555 integrated circuit and resistance R 7, R8 and capacitor C 1 are formed the bistable oscillation circuit, control light emitting diode V6 presses the certain frequency flash of light, wherein the time of " bright " state is determined by R7 and C1, state time of " going out " is determined by R8 and C1, resistance R 9 is as the currents match resistance of light emitting diode, and its resistance size determines the luminosity of light emitting diode.

If, more than from Fig. 1 Fig. 2 to speed of a motor vehicle speed limit information emission, reception, the set handling that comprises detection, calculating and the speed limit mark of current car speed numerical value, be the words that realize motor vehicle intervention type active speed limiting control prerequisite of the present invention, so next, adopting which kind of means that the vehicle of driving over the speed limit is carried out speed of a motor vehicle control, then is to realize key of the present invention.Below, continue again to elaborate with Fig. 2 overspeed alarming circuit (4), automatically controlled accelerator pedal on-off circuit (5).

In Fig. 2 overspeed alarming circuit (4), mainly be a transistor amplifier and a hummer.In the present embodiment, the switch controlling signal of being exported by the P2.2 mouth line of single-chip microcomputer is connected on the build-out resistor R10 of amplifying circuit, and V7 makes electronic switch by triode, the on/off of control hummer BEEP.When signal is opened in the output of software control single-chip microcomputer, making hummer BEEP send pipes as prompt tone, remind the driver to notice that vehicle has been in the state of driving over the speed limit, at this moment, the motorist should initiatively loosen accelerator pedal, stops to quicken and in 5 times in second the speed of a motor vehicle is reduced to this speed limit district and set in speed of a motor vehicle speed limit, otherwise, under the effect of scm software program, the control signal from another delivery outlet line output of single-chip microcomputer will start automatically controlled accelerator pedal on-off circuit.

In automatically controlled accelerator pedal on-off circuit (5), a transistor amplifier and electromagnetic core of a VMOS tube drive circuit control make the throttle drag-line dockingundocking of motor vehicle open accelerator pedal control.In the present embodiment, P2.1 mouth line by single-chip microcomputer, switch controlling signal (the so-called switching signal of output, generally be exactly that the high-voltage value representative is opened, the low voltage value representative is closed), be connected on the build-out resistor R11 of amplifying circuit, V8 makes electronic switch by triode, control VMOS manages the V9 conducting or ends, build-out resistor R12 and VMOS pipe V9 and diode V10 form Drive Protecting Circuit, according to the instruction of single-chip microcomputer output, after overspeed of vehicle travels, during software control single-chip microcomputer output " opening " signal, make electromagnetic core and permanent magnet actuating and disconnecting, the air throttle return, engine is in idling mode by force, and the driver can't utilize accelerator pedal control vehicle to continue to run at high speed; And when software control single-chip microcomputer output " pass " signal, electromagnetic core and permanent magnet return automatically in attracting state, and on making accelerator pedal and Throttle Opening Control being connected, this moment, vehicle speed just can be under driver's control again.

Speed of a motor vehicle control also can be taked another kind of mode, and with a relay that has only normally closed contact, with the disconnection of vehicle petrol pump motor power supply line, its breakpoint is connected respectively on two contacts of relay.The relay control line is identical with automatically controlled accelerator pedal module wiring, also is connected on two reference mark Fig. 2 (5) 1,2 output points of automatically controlled accelerator pedal on-off circuit.So, single-chip microcomputer can pass through the on-off circuit pilot relay, makes the vehicle petrol pump be in power supply or off-position; When single-chip microcomputer was exported " opening " signal by on-off circuit, the contact of relay converted disengaged condition to from normally closed on-state, and the petrol pump power supply disconnects, and reached the deceleration purpose thereby vehicle power is descended; And single-chip microcomputer is during by on-off circuit output " opening " signal, the contact of relay is in normally off always, perhaps change normally closed on-state into from the disengaged condition revolution, petrol pump service restoration (reducing to below the speed limit that scm software sets 20 kilometers from overspeed condition) makes the vehicle power fuel feeding revert to normal running dynamically (the oil pump circuit connection diagram slightly).

In addition,, make the Throttle Opening Control pedal of some rear engines along with the continuous development of automotive engineering, employing be the electric transducer form.Same, also can adopt the relay mode to cut off the fax sense signal of Throttle Opening Control pedal, just can realize the speed limit purpose.

Fig. 3 is automatically controlled accelerator pedal module configuration diagram.Among the figure: throttle guy anchor (1); Throttle drag-line (2); Bearing (3); Casing (4); Mould system connecting shaft cover (5); Permanent magnet (6); Electromagnetic core (7); Interior cover location blind nut (8); Interior cover pressing plate (9); Insulation filling material (10); Cover (11) in the flanged pin electromagnet; Electromagnetism winding (12); Overcoat groove (13); Electromagnet overcoat (14); Interior cover is adjusted spring (15); Accelerator pedal rotation axis (16); Bearing (17); Retracing spring (18); Accelerator pedal (19).Below in conjunction with diagrammatic sketch its structure and working condition are described.Single-chip microcomputer speed of a motor vehicle control circuit and software do not have control signal output in Fig. 2, electric current is during by the automatically controlled accelerator pedal module of Fig. 3+12V wiring, as long as the motorist is bend the throttle (19), the throttle guy anchor (1) of automatically controlled accelerator pedal casing (4) opposite side rotates thereupon and spurs the throttle opening that throttle drag-line (2) tension is connected with the throttle drag-line, engine speed and power are subjected to the depth of motorist's step on the accelerator and dynamics size and change and (do not draw in air throttle and the junctor composition, slightly); When leaving accelerator pedal when motorist's release the gas pedal or with pin, accelerator pedal (19) is under retracing spring (18) effect, throttle guy anchor (1) returns back to and is in idle position, and its relation is always interactive synchronized relation, acts on identical with common accelerator pedal; In the automatically controlled accelerator pedal module power supply wiring of Fig. 3, there is electric current to pass through, also be that Fig. 2 single-chip microcomputer speed of a motor vehicle control circuit and software have control signal output by VMOS pipe conducting Fig. 2 (5) 1, during 2 output 12V power supplys, Fig. 3 electromagnetism winding (12) has electric current to pass through, electromagnetic core (7) is identical with permanent magnet (6) adhesive end S end polarity, repel mutually, actuating and disconnecting between two iron, Fig. 3 accelerator pedal (19) acting force can't act on the throttle drag-line (1), accelerator pedal is stepped on sky, aperture control to air throttle is ineffective, engine speed descends and is in the idling work state, engine is under not flame-out situation, over-speed vehicles has only deceleration and can't quicken, thereby reaches the purpose of motor vehicle intervention type active speed limiting control key operations of the present invention design.

Connect down, set forth annexation between automatically controlled accelerator pedal module structure and the parts according to Fig. 3.Among Fig. 3, have in the flanged pin electromagnet insulation filling material (10) that electromagnetic core (7) and solenoid winding (12) are insulated in the cover (11) and be fixed in in the cover; Cover is embedded in the overcoat groove (13) of electromagnet overcoat (14) in the flanged pin electromagnet, with the conjuncted rotation of electromagnet overcoat (14), during assembling, can pass through adjust the setting between spring (15), interior cover location blind nut (8), the interior cover pressing plate parts such as (9) between the interior cover of interior overcoat, electromagnetic core (7) is positioned on the optimal combination surfaces of holding with permanent magnet (6) S, reaches best attracting state between two iron.Among Fig. 3, casing (4) two side bearings (3) and (17) axis hole be symmetry with one heart, all is on the same axial line again; Electromagnet overcoat (14) is connected with accelerator pedal rotation axis (16); Permanent magnet (6) with mould the system connecting shaft cover (5) conjuncted; When having, accelerator pedal (19) jams on when action up and down, its acting force is through retracing spring (18) → accelerator pedal rotation axis (16) → electromagnet overcoat (14) → permanent magnet (6) and mould system connecting shaft cover (5) and affect throttle guy anchor (1) to rotate on axially same, spurs the motor vehicle air throttle up and down through throttle drag-line (2).

Fig. 4 is a single-chip microcomputer speed of a motor vehicle Control Software process flow diagram, continues the invention process is further described with Fig. 4 below.

After the system power-up, CPU software begins to carry out, and its software flow promptly is work and the course of action of CPU.Program enters from " 1 " position " " of process flow diagram, and Single Chip Microcomputer (SCM) system is carried out initial work, comprises with the internal storage zero clearing (steps 2) such as I/O port configurations; Single-chip microcomputer is arranged to per 0.1 second repetition type once with inner timer by present embodiment and is regularly interrupted the application pattern, and this timer of startup running, simultaneously, open timer interrupt control (step 3), later on every 0.1 second, single-chip microcomputer is accepted this timer interrupt request, suspends other routine processes work, enters in Fig. 5 Interrupt Process subroutine that process flow diagram " 19 " position begins.More than action is 1 → 2 → 3 → step of process flow diagram, and after entering " 4 " position of process flow diagram, scm software will no longer be carried out this part program.

" 4 " position at process flow diagram begins, and program is with circular flow always, up to system closedown; Software at first reads the speed limit mark (step 4) that interruption subroutine is provided with, judge whether (step 5) for sexadecimal number 5A, when conclusion is "No", represent that present vehicle is not in the Control for Speed Limitation zone, software control is closed (step 6) with the flash of light of speed limit indicator, (step 7), this is the insurance action to close the timer that may be in open mode and voice guard simultaneously.In Fig. 4 process flow diagram, program will arrive up to a Control for Speed Limitation order occurring according to the execution that circulates of 4 → 5 → 6 → 7 → 4 these flow processs always; And when conclusion is "Yes", represent that present vehicle is in the Control for Speed Limitation zone, software control is taken out (step 8) with speed limit and current vehicle speed value that the flash message and the interruption subroutine of speed limit indicator calculates, next step will judge whether hypervelocity (step 9), when conclusion is "No", represent that present vehicle is not in the state of driving over the speed limit, the timer that may be in open mode and voice guard are closed in software control, and (step 10), this is the insurance action.In Fig. 4 process flow diagram, program will be according to the execution that circulates of 4 → 5 → 8 → 9 → 10 → 4 these flow processs always; When step 9 judges whether that the conclusion that exceeds the speed limit is "Yes", represent that present vehicle is in the state of driving over the speed limit, the program start audible alarm (step 11), starts 5 seconds timers and (step 12), reads new current vehicle speed value and (step 13), judge whether hypervelocity (step 14); When conclusion is "No", the expression vehicle is in 5 seconds, the motorist has been reduced to the speed of a motor vehicle the non-state of driving over the speed limit, and the timer and the voice guard of open mode closed in software control, closes the automatically controlled accelerator pedal circuit (step 15) that may be in starting state.In Fig. 4 process flow diagram, program will be according to the execution that circulates of 4 → 5 → 8 → 9 → 11 → 12 → 13 → 14 → 15 → 4 these flow processs always; When step 14 judges whether that the conclusion that exceeds the speed limit is "Yes", need further to judge whether this state surpasses 5 seconds (step 16), if do not surpass 5 seconds, turns back to step 13 place; If above 5 seconds, software can be opened automatically controlled accelerator pedal module, get involved by force, the speed of a motor vehicle is reduced (step 17), and between step 17 and step 18 place, carry out repeatedly, be reduced to 20 kilometers places below the speed limit up to judging that the speed of a motor vehicle is chastening, timeing closing device, chimes of doom and disconnect automatically controlled accelerator pedal module power supply (step 15) then, vehicle is become a full member often to be operated and transport condition, in Fig. 4 process flow diagram, program will be according to the execution that circulates of 13 → 14 → 16 → 17 → 18 → 15 → 4 these flow processs always.

Fig. 5 Interrupt Process subroutine in the software is described below.Open 0.1 second regularly at software program, after timing arrived each time, timer sent an interrupt request to single-chip microcomputer; software will interrupt the program of carrying out; protect field data, forward the Interrupt Process subroutine then to, be i.e. 19 positions in Fig. 5 interruption subroutine process flow diagram.First function of subroutine be exactly software by reading the numerical value in the counter 0 in the single-chip microcomputer sheet, calculate new speed limit instruction input value (step 20); Step 21 is to judge whether new speed-limiting messages, be exactly not to be " 0 " when counter 0 interior data, then expression has new speed limit instruction to import from electromagnetic pulse sensor, software execution in step 22 is provided with the single-chip microcomputer inner marker, program judges whether to cancel speed limit (step 23) according to a preconcerted arrangement then, when being judged as the cancellation speed limit numerical value instruction that is not specific, software calculates speed limit and current vehicle speed numerical value with the measured frequency method and upgrades in the relevant position preserves (step 24), be provided with once more and start 0.1 second timer, so that enter subroutine (step 27) next time, turn back to the interrupted position of master routine (step 28) then and continue working procedure.In Fig. 5 subroutine flow chart, program will be according to 19 → 20 → 21 → 22 → 23 → 24 → 27 → 28 these flow performing.When step 23 is judged when being the instruction of specific cancellation speed limit numerical value, software is removed inner marker and speed limit, vehicle derailing speed limit zone (step 25), be provided with once more and start (step 27) behind 0.1 second the timer, turn back to the interrupted position of master routine (step 28) then and continue working procedure.In Fig. 5 subroutine flow chart, program will be according to 19 → 20 → 21 → 22 → 23 → 25 → 27 → 28 these flow performing; When step 21 judgement does not have new speed limit, computed in software goes out current vehicle speed numerical value and upgrade to preserve (step 26) in the relevant position, be provided with once more and start (step 27) behind 0.1 second the timer, turn back to the interrupted position of master routine (step 28) then and continue working procedure.In Fig. 5 subroutine flow chart, program will be according to 19 → 20 → 21 → 26 → 27 → 28 these flow performing.

It more than is the embodiment of the invention.In sum, the different variable pulse oscillation frequency that electromagnetic pulse signal emissive source of the present invention sends are represented different speed of a motor vehicle speed limit signals, after vehicle-mounted electromagnetic pulse signal receiver induction reception, be reduced to speed of a motor vehicle speed limit through single-chip microcomputer calculating, be stored in the single-chip microcomputer stored unit, and incessantly with advance in vehicle current vehicle speed numerical value compare.When single-chip microcomputer detects current vehicle speed numerical value greater than the speed limit numerical value of single-chip microcomputer stored, the overspeed alarming circuit sends overspeed alarming sound, the driver needs in 5 second time to reduce to below the speed limit from being about to the speed of a motor vehicle, otherwise, under the effect of single-chip microcomputer instruction repertorie, there is electric current to pass through solenoid in the automatically controlled accelerator pedal module in the automatically controlled accelerator pedal on-off circuit, make permanent magnet and the electromagnetic core that adhesive in the assembly repel disengagement mutually, engine is in idling mode thereupon, vehicle deceleration, the driver is controlled ineffective to stepping on of accelerator pedal; When vehicle speed is brought down below below the speed limit 20 kilometers when locating automatically, solenoid in the automatically controlled accelerator pedal module does not have electric current to flow through, the adhesive again of permanent magnet and electromagnetic core, accelerator pedal recovers the control effect of stepping on to air throttle, and the driver just can free improve the speed of a motor vehicle.Above operation program is not before vehicle-mounted electromagnetic pulse receiver is responded to the characteristic frequency pulse signal that receives the cancellation speed limit, speed of a motor vehicle control to the vehicle of driving over the speed limit is undertaken by above-mentioned action and program repeat, thereby reaches the purpose to the control of motor vehicle intervention type active speed limiting.

For adopting the frequency modulated radio signal emission, the embodiment of the invention receives explanation (circuit theory diagrams slightly) below.

In speed of a motor vehicle speed limit emissive source, with the electromagnetic pulse signal emissive source same have a crystal oscillator, a controllable frequency divider (CPLD), a frequency is selected network, these have produced the Frequency-Coded Pulse Signal of expression speed limit numerical value.Frequency modulating radio transmitter can adopt the direct frequency modulation mode, and technology is very ripe, use very simple, select an existing frequency-modulated transmitter integrated circuit (IC) products for use, only need provide the carrier frequency frequency pulse to it, input signal, output are directly coupled on the antenna just passable.Carrier frequency frequency pulse signal, using a crystal oscillator to add an electric capacity just can make the frequency-modulated transmitter integrated circuit in running order, its input end connects a capacitance, Frequency-Coded Pulse Signal coupling input with speed limit numerical value, other work frequency-modulated transmitter integrated circuit is launched signal by directional antenna, perhaps after handling from ground, crossing, also transmitter can be installed on the police car, signal is launched from police car.

Among the present invention, vehicle-mounted FM signal receiver also adopts the whole integrated package embodiment of FM reception integrated circuit.Its local oscillator or base frequency oscillation frequency are used a crystal oscillator identical with transmitter, need not tuningly, and the frequency-modulated wave of antenna coupling is after portion carries out demodulation, filtering, amplification within it, and the Frequency-Coded Pulse Signal of output expression speed limit numerical value is to single-chip microcomputer.Launch, receive this pulse signal that obtains after the processing by the FM radio set mode, identical with the pulse signal that signal is launched, reception obtains after handling by the electromagnetic pulse mode, replace the electromagnetic pulse signal receiving circuit with the FM radio set receiving circuit, the signal that receives is input among the T0/P3.4 of single-chip microcomputer equally, and the work that need do of system is identical with electromagnetic pulse signal transmitting-receiving mode then.

Illustrate: the present invention's single-chip microcomputer device, can adopt other identical function single-chip microcomputer devices and not be subjected to that AT89C52 single-chip microcomputer model limits in the specific embodiment of the invention when specifically implementing.

Claims (10)

1, intervention type active speed limiting control device of motor vehicle, its feature: comprise the electromagnetic pulse signal emissive source, it is underground to be satisfied with porch, Speed Limitation on Freeway highway section, perhaps, also can be the frequency modulated radio signal emissive source, be satisfied with on the ground, porch, Speed Limitation on Freeway highway section or on the police car; The different impulse hunting frequencies that emissive source is launched, the speed of a motor vehicle speed limit of representing different highway sections speed limitation board to indicate, wherein, the pulse signal frequency that emissive source is the highest separately is the set specific frequency signal of cancellation speed limit setting;

Comprise single-chip microcomputer and the vehicle speed control system circuit formed by vehicle-mounted electromagnetic pulse signal receiver (or frequency modulated radio signal receiver), Hall vehicle speed pulse signal source, speed limit indicator and circuit, overspeed alarming circuit, automatically controlled accelerator pedal on-off circuit; Described vehicle-mounted electromagnetic pulse signal receiver (or frequency modulated radio signal receiver), the electromagnetic pulse signal that induction receives is imported on the general input of single-chip microcomputer, be reduced to speed of a motor vehicle speed limit through single-chip microcomputer calculating, be stored in the storage unit in the single-chip microcomputer; Another input port of described Hall vehicle speed pulse signal source input single-chip microcomputer calculates current vehicle speed numerical value by single-chip microcomputer, compares for the speed of a motor vehicle speed limit of storing in single-chip microcomputer and the storage unit, and the judgement overspeed of vehicle is whether foundation; Described speed limit indicator and circuit, with the delivery outlet line interface of single-chip microcomputer, the flashing signal of its indicator, the bulletin vehicle has entered the highway section of Control for Speed Limitation, and the motorist need not exeed the regulation speed and drive; The delivery outlet line interface of described overspeed alarming circuit and single-chip microcomputer, the chimes of doom that the overspeed alarming circuit sends, bulletin vehicle have been in the transport condition that exeeds the regulation speed, and the motorist needs to slow down voluntarily; Described automatically controlled accelerator pedal on-off circuit and single-chip microcomputer delivery outlet line interface, the 12V power supply signal of on-off circuit output start to control to make to the deceleration fuel feeding of motor vehicle by automatically controlled accelerator pedal module to be used;

In the described single-chip microcomputer, comprise that the speed of a motor vehicle Control Software that writes is in advance arranged in the single-chip microcomputer sheet, this speed of a motor vehicle Control Software plays speed of a motor vehicle calculating, supervisory function bit to entering speed limit highway section vehicle, and according to the corresponding command signal of sending Control for Speed Limitation of overspeed of vehicle field conditions;

Intervention type active speed limiting control device of motor vehicle, its feature also comprises automatically controlled accelerator pedal module; Electromagnetic induction coil two leads in the described automatically controlled accelerator pedal module are connected with automatically controlled accelerator pedal on-off circuit power output end, and when electromagnetic induction coil had electric current to pass through, electromagnetic core polarity and permanent magnet repelled each other;

Intervention type active speed limiting control device of motor vehicle, its feature also comprises no matter adopting electromagnetic pulse signal, perhaps adopt frequency modulated radio signal emission receive mode, Hall pulse signal source in the described onboard system, speed limit indicator and circuit, overspeed alarming circuit, automatically controlled accelerator pedal on-off circuit, and the formation of scm software and automatically controlled accelerator pedal module, software flow and working method are constant, and function is identical.

2, according to the described device of claim 1, it is characterized in that: a crystal oscillator JT is arranged in the described electromagnetic pulse signal emissive source, its frequency signal outputs on any one arrival line of a CPLD integrated circuit FPQ, 9 resistor chain R3 and one 9 select 1 waver SW to connect into switching network, are connected on other 9 inlets of CPLD integrated circuit FRQ; A delivery outlet of CPLD integrated circuit; connect the road of discharging before resistance R 1 is formed with triode; the post-stage drive circuit that driving resistor R2 and triode V2 form; be connected to triode V2 and+telefault L1 between the 12V power supply; electromagnetic signal to aerial transmission, and is played the effect of afterflow protection driving circuit with a diode V3 that this coil L1 is connected in parallel.

3, according to the described device of claim 1, it is characterized in that: the telefault L2 in the described vehicle-mounted electromagnetic pulse signal receiver links to each other with a diode V4, be used to extract the electromagnetic induction signal of positive phase, form voltage amplifier by resistance R 4.R5 and triode V5, electromagnetic induction signal is amplified to the Transistor-Transistor Logic level amplitude, outputs on the counter mouth T0 mouth of single-chip microcomputer D1.

4, according to the described device of claim 1, it is characterized in that: in the described Hall vehicle speed pulse signal source, Hall element HR is connected to one+and the resistance R 6 of 5V power supply links to each other, and forms the vehicle speed pulse signal of Transistor-Transistor Logic level amplitude, output on another counter mouth T1 mouth of single-chip microcomputer D1.

5, according to the described device of claim 1, it is characterized in that: described speed limit indicator and circuit have an integrated circuit D2:NE555 and the resistance R 7 that is connected, R8 and capacitor C 1 control to produce the oscillator signal of certain frequency, output terminal Q connects a light emitting diode V6, by current-limiting resistance R9 be connected to+the 12V power supply on, glisten according to the frequency that integrated circuit D2 produces, the control end R of integrated circuit D2 links to each other with the general delivery outlet P2.0 of single-chip microcomputer D1, is sent out flash of light or is extinguished steering order by single-chip microcomputer D1.

6, according to the described device of claim 1, it is characterized in that: described overspeed alarming circuitous resistance R10 links to each other with the general delivery outlet P2.2 of single-chip microcomputer D1, and the triode V7 that has controlled amplification drives hummer BEEP and sends chimes of doom.

7, according to the described device of claim 1, it is characterized in that: the resistance R 11 in the described automatically controlled accelerator pedal on-off circuit links to each other with the general delivery outlet P2.1 of single-chip microcomputer D1, triode V8 and resistance R 12 electrify and press big effect, transistor V9 plays the electric current driving action, open close by output point 1,2 control+12V power supplys, the adhesive of permanent magnet and electromagnetic core in the automatically controlled accelerator pedal module is discharged, reach the purpose that accelerator pedal separates with the throttle drag-line; Diode V10 play a part to release automatically controlled accelerator pedal permanent magnet and electromagnetic core adhesive and discharge the recoil current protection transistor V9 that moment produces.

8, according to the described device of claim 1, it is characterized in that: the software program that described single-chip microcomputer machine is carried out, be divided into a main program flow and a timing interruption subroutine flow process, wherein the software timing of interruption subroutine flow process interrupts the execution of main flow program, plays insertion calculating vehicle current driving speed numerical value and calculating and has judged whether new speed limit numerical value instruction input action; And the work of main program flow is to judge that the current speed limit highway section that whether is in of vehicle travels, and judges whether vehicle is in the state of driving over the speed limit and according to the overspeed of vehicle scene, plays the instruction over-speed vehicles and do the speed-down action effect.

9, according to the described device of claim 1, it is characterized in that: described automatically controlled accelerator pedal module is to the control of motor vehicle fuel feeding, and the control signal that also can adopt automatically controlled accelerator pedal on-off circuit to export plays the relay switch and the circuit of on/off effect to motor vehicle fuel pump motor power lead.

10, according to the described device of claim 1, it is characterized in that: the frequency coding pulse of the expression speed limit numerical value that described speed of a motor vehicle speed limit employing frequency modulated radio signal radiation pattern sends, import in the single-chip microcomputer TO/P3.4 mouth identical too with the electromagnetic pulse signal receiver.

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