CN2243996Y

CN2243996Y - Low pressure remote controller warning device for automobile tire

Info

Publication number: CN2243996Y
Application number: CN 95222488
Authority: CN
Inventors: 王文林
Original assignee: 王玉西
Priority date: 1995-10-04
Filing date: 1995-10-04
Publication date: 1997-01-01
Anticipated expiration: 2005-10-04

Abstract

The utility model discloses a warning device with a remote controller for the low pressure of a car tyre, which is composed of a transmitting circuit and a receiving circuit. The transmitting circuit is composed of an indicator circuit, a free-running multivibrator and a high-frequency transmitting circuit; the receiving circuit is composed of a filtering circuit, a voltage-stabilizing circuit, a signal reception head, a one-stage amplifying circuit, a two-stage amplifying circuit, a frequency selection amplifying circuit, a speech triggering circuit and a power amplification circuit. The transmitting circuit is arranged on a car steel ring, powered by a battery and connected with a warning device switch; the receiving circuit is arranged in a cab.

Description

Automobile tyre low pressure remote controller alarm device

The utility model relates to the remote-controlled alarm device of air pressure of automobile tire when specified pressure (normal operating pressure) is following.

Automobile is one of most important vehicle.Tire is the most damageable parts of running car, causes that owing to air pressure is low damaged tyres is again a chief reason especially.Tire is deposited tolerance and is in the low pressure driver and generally is difficult for realizing, if damaged tyres especially under steam will cause the load of adjacent tires, thereby produce chain reaction.Therefore, how the driver can find tire deflation in time, and this is that problem to be solved is arranged, and at present, goes back the warning instrument of neither one practicality.The theoretical scheme that can provide, as Chinese patent CN93206186.9, " automobile tyre low pressure autoalarm " is though when this patent has proposed automobile tyre low pressure, send warning to the driver, but because the defective of sensing arrangement, add to electric appliance circuits and adopt wired conduction, and automobile in motion, tire is in high speed rotating, circuit should not be installed, thereby above-mentioned patent lacks implementation.

The motor tire poor working environment is corroded by rainwater, silt directly, expose in freezing winter and in sultry summer among.So, how to make practical automobile tyre low pressure warning device, its designing requirement is very high.

The purpose of this utility model is a kind of remote control circuit cooperative mechanical switch of design, the alarm device when being used for automobile tyre low pressure.

The technical scheme of the utility model automobile tyre low pressure remote detector alarm device is: be made up of transmission circuit and acceptor circuit, its transmission circuit is the indicating circuit of joining power, the free running multivibrator circuit in parallel with indicating circuit connects high frequency transmission circuit behind free running multivibrator; So-called acceptor circuit is the filter circuit and the mu balanced circuit of joining power, the signal in parallel with filtering and mu balanced circuit receives a circuit, receive an electrical hookup one-level amplification, secondary amplification and selective frequency amplifier circuit with signal, connect the speech trigger circuit thereafter, trigger circuit connect power amplifier.

Automobile tyre low pressure remote controller alarm device of the present utility model, its transmission circuit links to each other with mechanical switch on being installed in the motor tire stem of valve, can be in time, when exactly tire pressure being dropped to design value, give acceptor circuit signal, acceptor circuit is installed in the automobile cab, and signal is informed chaufeur.This apparatus structure is reasonable, is fit to suitability for industrialized production, uses reliable, practical.

Fig. 1 is an automobile tyre low pressure remote controller alarm device transmission circuit scheme drawing;

Fig. 2 is an automobile tyre low pressure remote controller alarm device acceptor circuit scheme drawing.

Below in conjunction with Fig. 1-Fig. 2 an embodiment of the present utility model is done detailed explanation.

The transmission circuit power supply is by the power supply of 12V minicell, and K represents the alarm device switch, not adhesive under normal circumstances, not power consumption of entire circuit, when tire pressure hanged down to design value, just closed, radiating portion work was after receiving unit receives and transmits, send alarm call, remind the driver to note resistance R ₁, R ₅Play metering function, cond C ₁Strobe resistance R ₂Form indicating circuit with diode (LED), LED is bright, and corresponding tire lacks presses.Resistance R ₂One end power supply, the other end is connected with the positive pole of diode (LED); The LED negative earth.By integrated package F ₁, F ₂, resistance R ₃, R ₄, R ₁₀With cond C ₂Form free running multivibrator, produce the brachmorphy ripple, as modulation signal.Integrated package F ₁Two pin indicating circuit power connection in parallel positive and negative electrodes, integrated package F ₁Other is two pin series connection integrated package F ₂And resistance R ₃, resistance R ₃With integrated package F ₂Between condenser in series C ₂, at integrated package F ₁With F ₂Between connecting resistance R ₄, R ₁₀, resistance R ₄, R ₁₀Shunt resistance R ₃With cond C ₂Its vibration is by C ₂Discharge and recharge and realize, work as F ₂Mouth be height at ordinary times, F ₁Input end also be high level, F ₁Mouth be low level, at this moment, C ₂To R ₄, W discharge, at this moment, the flow direction of electric current shown in Fig. 1 solid arrow, F ₁Output end voltage descends, when dropping to F ₁Changing voltage Vt the time, transition appears immediately, F ₁The output high level, F ₂Output low level, at this moment current direction is opposite, shown in empty arrow, C ₂Charging, F ₂Input terminal voltage descend, when dropping to F ₂Changing voltage Vt the time, F ₂Mouth become high level immediately, above-mentioned circulation appears later on again and again.R ₃Be compensating resistance, owing to all be added with the protection diode at the mouth of cmos circuit, because the vibration of protection diode pair can produce clamping action, oscillation frequency will be subjected to the influence of mains voltage variations, adjunction R ₃, can eliminate this influence, improve the stability of frequency.By cond C ₃, C ₄, C ₅, Cx, inductance L ₁, L ₂, resistance R ₅Form high frequency transmission circuit, resistance R with aerotron BG ₅The integrated package F of a termination free running multivibrator ₂With cond C ₂Between, the other end is pressed cond C ₃, C ₃Other end power connection, the emitter of aerotron BG is connecting resistance R simultaneously ₅With cond C ₃, the base stage connecting resistance R of BG ₆With cond C ₄, the collecting electrode of BG meets cond C simultaneously ₄And inductance L ₁, resistance R ₆Other end power connection, inductance L ₁Middle condenser in series C ₅, Cx, inductance L ₁With L ₂Series connection, L ₂Other end power connection.Work as F ₂When being output as high level, BG ends, trading halt; Work as F ₂When being output as low level, the BG conducting.L ₁Be loop antenna, can launch radiowave.

Acceptor circuit: it receives head, one-level amplification, secondary amplification, frequency-selecting amplification, speech trigger, power amplifier etc. by filtering, voltage stabilizing, signal and forms.Power supply is from 12V automobile storage battery, R ₂₁Be current-limiting resistance, the filter capacitor C of joining power ₂₁, C ₂₂Form filter circuit, C ₂₂Parallel voltage-stabilizing diode Dz ₂, C ₂₃Be to prevent radio-frequency interference.Signal receives a circuit by resistance R ₂₃, R ₂₆, R ₂₇, cond C ₃₈With aerotron BG ₂₁Form aerotron BG ₂₁Connecting resistance R on the substrate ₂₆, BG ₂₁Emitter resistance R ₂₇, cond C ₂₈, resistance R ₂₃A termination mu balanced circuit, another termination BG ₂₁Collecting electrode.The purpose that signal receives head is: (1) produces local oscillation frequency.(2) amplify receiving the signal that comes, and superpose R with the local oscillation waveform ₂₃-R ₂₆Be biasing resistor, R ₂₇, R ₂₈Be the Current Negative Three-Point Capacitance element, in case temperature traverse causes BG ₂₁The β value change, improve Ic, f _ThisStability.Since still quite faint from receiving a modulation wave signal of separating, therefore, also need to carry out processing and amplifying.Amplifying circuit is by coupling capacitor C ₃₀, C ₃₂, stopping direct current is logical to exchange biasing resistor R ₂₈, R ₂₉, R ₃₀, R ₃₁, R ₃₂, diode D ₂₁, D ₂₂Be the clamp reverse voltage, filter capacitor C ₃₈, resistance R ₃₄, R ₃₅With aerotron BG ₂₄Form.Cond C ₃₀A termination signal receive a circuit, the series connected resistance R of another termination ₂₈, R ₂₉, R ₃₀, aerotron BG ₂₄The collecting electrode power connection, emitter connecting resistance R ₃₄, R ₃₅, base stage meets series capacitors C ₃₇, C ₃₆, C ₃₅, C ₃₄, resistance R ₃₁, R ₃₂Series connection power supply and cond C ₃₂The purpose of frequency selection circuit is to amplify modulating wave, suppresses disturbing wave, reaches the reliability of reception.R ₃₈Be filtering, R ₃₄Can improve f _ChoosingStability, when signal, (refer to transmit normally), BG24 emitter output be vdc; When no signal, R ₃₈Through R ₃₄Discharge, R ₃₅Be current-limiting resistance, so that provide the language sheet suitable electric current.The language trigger circuit are subjected to frequency selection circuit control, by resistance R ₂₀, R ₃₀, R ₃₆, diode D ₂₃, D ₂₄, LED ₂₀Form R ₂₀A pin connect series connected resistance R ₃₆With diode D ₂₃, D ₂₄, LED ₂₀, R ₃₆Other end power connection, LED ₂₀Negative earth.Work as R ₂₀Trigger R during for high level ₃₆, D ₂₃, D ₂₄, LED ₂₀Form the indication bleeder circuit, provide language sheet operating voltage on the one hand, whether indicating circuit enters normal condition on the other hand.Power amplifier is by ic chip ₂₀, cond C ₃₈, C ₃₉, C ₄₀, C ₄₁, C ₄₂, resistance R ₃₇, loudspeaker Y ₂₀Form.Ic chip ₂₀Pin 3 meet cond C ₃₈And C ₃₉, C ₃₈Other end connecting resistance R ₂₀, cond C ₃₉R in parallel ₃₇While ground connection, IC ₂₀Pin meet cond C ₄₀Ground connection, IC ₂₀Pin 5 meet cond C simultaneously ₄₁And C ₄₂Be coupling electrical equipment, C ₃₉, C ₄₁In case radio-frequency interference, C ₄₀Be shunt capacitance, R ₃₇Be shunt resistance, signal is from IC ₂₀Pin3 input, after amplifying, sound signal is exported from pin5, pin1, the pin8 short circuit makes the sound signal gain control within 20dB, the purpose of doing like this makes the sound intensity of each warning the same substantially.

Claims

1, automobile tyre low pressure remote controller alarm device, formed by transmission circuit and acceptor circuit, it is characterized in that transmission circuit is the indicating circuit of joining power, the free running multivibrator circuit in parallel with indicating circuit connects high frequency transmission circuit behind free running multivibrator; So-called acceptor circuit is the filter circuit and the mu balanced circuit of joining power, the signal in parallel with filtering and mu balanced circuit receives a circuit, receive an electrical hookup one-level amplification, secondary amplification and selective frequency amplifier circuit with signal, connect the speech trigger circuit thereafter, trigger circuit connect power amplifier.

2, automobile tyre low pressure remote controller alarm device as claimed in claim 1, the indicating circuit that it is characterized in that transmission circuit is resistance (R ₂) and diode (LED) composition, resistance (R ₂) termination power, the other end is connected with the positive pole of diode (LED), diode (LED) negative earth; The free running multivibrator in parallel with indicating circuit is by integrated package (F ₁, F ₂), resistance (R ₃, R ₄, R ₁₀) and cond (C ₂) form integrated package (F ₁) two pin indicating circuit power connection in parallel positive and negative electrodes, integrated package (F ₁) two pin series connection integrated package (F in addition ₂) and resistance (R ₃), resistance (R ₃) and integrated package (F ₂) between condenser in series (C ₂), at integrated package (F ₁) and (F ₂) between connecting resistance (R ₄, R ₁₀), resistance (R ₄, R ₁₀) shunt resistance (R ₃) and cond (C ₂); High frequency transmission circuit is by cond (C ₃, C ₄, C ₅, Cx), inductance (L ₁, L ₂), resistance (R ₅) and aerotron (BG) composition, resistance (R ₅) the integrated package (F of a termination free running multivibrator ₂) and cond (C ₂) between, another termination cond (C ₃), cond (C ₃) other end power connection, the emitter of aerotron (BG) is connecting resistance (R simultaneously ₅) and cond (C ₃), base stage connecting resistance (R (BG) ₆) and cond (C ₄), collecting electrode (BG) meets cond (C simultaneously ₄) and inductance (L ₁), resistance (R ₆) other end power connection, inductance (L ₁) middle condenser in series (C ₅, Cx), inductance (L ₁) and (L ₂) series connection, L ₂Other end power connection.

3, automobile tyre low pressure remote controller alarm device as claimed in claim 1 is characterized in that acceptor circuit is: the filter capacitor (C of joining power ₂₁, C ₂₂) the composition filter circuit, filter capacitor (C ₂₂) parallel voltage-stabilizing diode (DZ ₂); Signal receives a circuit by resistance (R ₂₃, R ₂₆, R ₂₇), cond (C ₂₈) and aerotron (BG ₂₁) form aerotron (BG ₂₁) connecting resistance (R on the base stage ₂₆), (BG ₂₁) emitter connecting resistance (R ₂₇), cond (C ₂₈), resistance (R ₂₃) a termination mu balanced circuit, another termination (BG ₂₁) collecting electrode; Amplifying circuit is by coupling capacitor (C ₃₀, C ₃₂), biasing resistor (R ₂₈, R ₂₉, R ₃₀, R ₃₁, R ₃₂), diode (D ₂₁, D ₂₂), filter capacitor (C ₃₈), resistance (R ₃₄, R ₃₅) and aerotron (BG ₂₄) form cond (C ₃₀) a termination signal receive a circuit, the series connected resistance (R of another termination ₂₈, R ₂₉, R ₃₀), aerotron (BG ₂₄) the collecting electrode power connection, emitter connecting resistance (R ₃₄, R ₃₅), base stage meets condenser in series (R ₃₇, C ₃₆, C ₃₅, C ₃₄), resistance (R ₃₁, R ₃₂) series connection power supply and cond (C ₃₂); The speech trigger circuit is by resistance (R ₂₀, R ₃₆), diode (D ₂₃, D ₂₄, LED ₂₀) form resistance (R ₂₀) a pin meet series connected resistance (R ₃₆) and diode (D ₂₃, D ₂₄, LED ₂₀), (R ₃₆) other end power connection, (LED ₂₀) negative earth; Power amplifier is by integrated package (IC ₂₀), cond (C ₃₈, C ₃₉, C ₄₀, C ₄₁, C ₄₂), resistance (R ₃₇), loudspeaker (Y ₂₀) form integrated package (IC ₂₀) pin (3) meet cond (C ₃₈) and (C ₃₉), (C ₃₈) other end connecting resistance (R ₂₀), cond (C ₃₉) (R in parallel ₃₇) while ground connection, (IC ₂₀) pin (7) meet cond (C ₄₀) ground connection, (IC ₂₀) pin (5) meet cond (C simultaneously ₄₁) and (C ₄₂), cond (C ₄₂) another termination loudspeaker (Y ₂₀) ground connection.