FR2468483A1 - WARNING CIRCUIT FOR MOTOR VEHICLES, MONITORING THE WEAR OF THE BELT AND THE LIGHTING - Google Patents

Abstract

The invention causes intermittent melodic gong sounds to sound and a warning light to shine when the driver has not initially buckled his seat belt, the key is left in the ignition, the door is left open or the lighting is switched off. remained on after removing the key. To this end, the acoustic signal 74 is controlled by the circuit 19 determining the frequency of repetition of the sounds at the desired rate and by the sound generator circuit 53, while the circuit 95 ensures the progressive attenuation of the sounds at each intermittence and that A multivibrator circuit 93 causes the pilot light to shine without flickering.

Description

WARNING SYSTEM FOR AUTOMOBILES, INSURING

  MONITORING THE WEAR OF THE BELT AND

LIGHTING.

  The invention covers a warning circuit for automobiles, ensuring the monitoring of the wearing of the belt and the lighting, this circuit being associated with the closing of the door, with an audible signal and with a warning lamp while an input is provided. on the ignition switch, an input and an output on the switch controlled by the belt, the output on the belt being connected to the door contact switch, as well as an input and an output on the indicator lamp , an entry on

  the light switch and an earth connection.

  We often unwittingly leave a car leaving its lighting

  lit so that after a certain waiting period the battery is discharged

  and the car can no longer start. The risk of forgetting to switch off the ignition is particularly high when the lamps have to be turned on in broad daylight due to poor visibility conditions or bad weather. The main reason for this is that the indicators inside the car cannot be read practically in broad daylight. To avoid this drawback, we have already provided, according to the German utility model 7712096, an audible warning to indicate if the headlights are lit when the ignition is off by letting the driver know when he leaves his vehicle that the headlights still light up after switching off the ignition and this by making a musical sound. For this purpose, there are in a case two coils controlled by transistors, exiies in turn and whose windings of opposite directions are placed in common on a coil core in the form of a bar crossing bores formed along the axes of the coils that a membrane capable of vibrating is placed in the path of this core. A suitable connection with the switch controlled by the door triggers the musical sound only when the car door is opened. Apart from the fact that the musical sound is relatively monotonous, this known warning circuit does not trigger any signal in the event that the driver does not fasten his belt, which must be considered as a big disadvantage in the conditions

current traffic.

  This is why, the subject of the invention is a warning circuit for motor vehicles, intended to inform the driver first of all that he has not fastened his belt at the start, then of the fact that the key is still there. on contact when the door is opened, thirdly that the light is still on although the key has been removed di, contact and the door has been opened and finally, when driving with the door open. This is why the invention proposes to establish as simply as possible a warning circuit of the type recalled above, where the warning is provided by a melodious gong sound and by a warning lamp which lights up without flickering - 2 - the assembly having a very high insensitivity to disturbances from the network mounted on board the car, the circuit according to the invention satisfying the conditions of

electromagnetic compatibility.

  The problem thus posed is resolved in accordance with the invention thanks to the fact that two combined circuits producing rhythms are combined with the acoustic signal, one of which gives the repetition frequency and the other the frequency of the sounds of a gong while that a terminal circuit produces the gradual melodic extinction of the gong sound and that a control lamp is connected to a multivibrator ensuring ignition without flickering of

this lamp.

  According to another aspect of the invention, the warning circuit comprises a Darlington transistor connected by its transmitter to the acoustic signal and by its collector at the inputs of the light and ignition switches, the base of this transistor being connected to a resistor and a diode to the generator of the frequency of the sounds and on the other hand, by this same resistance, another resistance as well as another diode

  to the rhythm generator at the repetition frequency, while between this other resistance

  tance and this other diode is interposed a capacitor connected to ground and

  used to define the characteristic sound of the gong.

  According to another characteristic of the invention, the multivibra circuit

  tor comprises a transistor connected by its emitter to the input of the positive supply voltage and by its collector to ground via two resistors connected in series, the base of this transistor being connected by a point of connection and resistance to a "plus" conductor and also by other connection points to an RC element followed by a connection point itself connected via a diode to the output of the control lamp, while a capacitor is interposed between one of the connection points mentioned in the second place and a connection point connected to the collector of the transistor. In addition, the connection point which is located after the RC element is connected on the one hand by a diode to the output of the belt switch and, on the other hand, to the collector a transistor whose base is connected to the connection point between the two resistors connected in series and whose emitter is grounded. The

  O rhythm generator for the frequency of repetition of the gong sounds can advantageously

be dismantled and reassembled.

  The essential advantage of the invention consists in the safety of the warning

  weaving made to the driver of the vehicle by melodic gong sounds when first the belt switch is closed, that is to say when the belt is not put on at start-up, secondly when the key is still on the ignition switch when the door is opened, thirdly when the light is still on and fourthly during the journey, when driving with the door open, 3 - the indicator light comes on , moreover, without wobbling, for a certain time at the time

  from the start so that the passenger always receives the notice to have to fasten their seatbelt.

  We will now describe the warning circuit according to the invention

  with reference, by way of example, to an embodiment shown in the drawings below

  seals, o: Fig. 1 is a diagram of the connections leading to the circuit

  horn according to the invention.

  Fig. 2 is a diagram of the warning circuit itself.

  Fig. 3 represents the curves indicating the pace as a function of time

  tensions producing the gong sounds.

  The ignition switch 1 (Fig. 1) is connected to input 2 of the

  warning circuit 5 and the light switch 3 is connected to the input 4 of the latter.

  In addition, the warning circuit 5 is connected to the warning lamp 6, which has the role of

  ask "please fasten your seat belts", via an input 7 and an output 8. On the other hand, the warning circuit 5 is connected by an input Il and an output to the switch 9 associated with the belt of the vehicle driver, this input 11 being connected via the connection point 12 to the switch 13 of the door contact. Finally, the warning circuit 5 is connected by the connection point 14 to ground. Input 2 of ignition switch 1 is connected by wire 15 (Fig. 2)

  in which the diode 16 and the resistor 17 are inserted, at the emitter of a transistor

  tor 18 whose collector is connected to the rhythm generator 19. The base of the transistor 18 is connected on the one hand to the grounding 14 through the connection point 20 passing through the capacitor 21 and on the other part to the resistor 22 which is itself connected by the connection point 23 on the one hand to the input 4 of the light switch 3 passing through the resistor 24 and the diode 25 and on the other

  diode 26 starts at input 11 of the belt switch 9. The collector of the transis-

  tor 18 is connected by resistor 27 and connection point 28 to the entrance of a door

  of non-conjunction 29. From this connection point 28 leaves a wire 30 in which is

  wedged the resistance 31 and which leads to the output 32 of the rhythm generator 19. The output of the gate 29 is connected by the three connection points 33,34,35 to another gate of non-conjunction 36 whose output is connected by connection points 37.38

  at the output of the rhythm generator 19 as well as through this connection point 37 to the conden-

  sator 39. The latter is connected by the wire 40 having two connection points 41, 42 to the other input of the non-conjunction door 2 9. The connection point 41 is connected by the resistor 43 to the connection point 34 and the connection point 42 is connected by

  resistor 44 and diode 45 at connection point 33.

  -4 - Beyond the resistor 17 inserted in the wire 16 are arranged in series the connection point 48 connected to the Zener diode 49, the connection point 50 connected to the capacitor 51 and the connection point 52 connected to the generator sounds 53. This point

  connection 52 is, for this purpose, connected by wire 54 to an input of the door of no -

  conjunction 55. In front of this entrance to gate 55 is the connection point

  56 connected by the resistor 57 to the ground wire 58. The exit from the door of no

  conjunction 55 is connected by wire 59 to connection points 60,61, leading to the inputs of another non-conjunction door 62 whose output is connected by connection point 63 on the one hand to output 64 of the generator sounds 53, and secondly,

    by the capacitor 65 and the connection point 66 to the second input of the door 55.

  The connection points 66 and 60 are connected together by the resistor 67.

  The output 32 of the rhythm generator 19 is connected by a diode 68,

  the connection point 69, the resistor 70, the connection point 71 and another resistor

  tance 72 at the base of the Darlington transistor 73 forming part of the terminal circuit 95 and the emitter of which is connected to the grounding wire 58 by means of the acoustic signal 74. The collector of the Darlington transistor 73 is connected by the points of

  connection 75,76 to the inputs 4 respectively of the light switch and the

  ignition tact. The connection point 71 located between the resistors 70 and 72 is connected via the diode 77 to the output 64 of the sound generator 53. The connection point 69 located between the diode 68 and the resistor 70 is connected to the grounding wire 58 via the capacitor 78. The connection point 79 6 located between

  the connection point 75 and the collector of the Darlington transistor 73 is connected by the

  intermediate of the capacitor 47 to the grounding wire 58. The input 7 of the indicator light 8 is connected by the wire 80 to the emitter of the transistor 81 whose collector is connected by the connection point 82, the resistor 83 , connection point 84 and resistance

  to ground wire 58. The base of transistor 81 is connected by the connection point

  nexion 101, the connection point 86, the capacitor 87 and the resistor 88 at the connection point 89 itself connected to the output 8 of the indicator lamp 6 via the diode 102 and also, passing through the diode 90 at the output 10 of the belt switch 9 as well as with the collector of another transistor 91. Between the points of

  connection 101 and 103 of wire 30 is interposed a resistor 104. The transmitter of the transis-

  tor 91 is connected to the grounding wire 58 and its base is connected to the connection point 84 located between the resistors 83 and 85. A capacitor 92 is mounted in parallel with the transistor 81 between the connection points 86 and 82 to serve as a capacitor

  protection against any unexpected introduction of overvoltages.

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  The assembly comprising the capacitor 51, the Zener diode 49 and the resistor 17 stabilizes the voltage for the frequency of sound and rhythm. The voltage is supplied by the network on board the vehicle to at least one of the inputs 4 and 2 of the warning circuit 5. The current first passes through at least one of the diodes 25 and 16 and passes through resistor 17 to sub-divide then leaving a current

  fairly weak control the frequency of sound and rhythm and a stronger current

  enter the transistor 73 to act on the sound signal 74. The capacitors 51

  and 47 protect the warning circuit against any possible overvoltages-

  also in the network on board the vehicle. Acoustic signal 74 makes sounds heard

  melodic of a gong. The amplification of the sounds thus provided is ensured by the transis-

  tor Darlington 73. The repetition frequency of the gong sounds is determined by circuit 19 of the rhythm generator and the frequency of the gong sounds is provided by circuit 53 of the tone generator. The gong sounds are obtained by the fact that the amplitude of a continuous sound is made to decrease exponentially in the manner of the envelope curve of the sounds of a gong. When the capacitor 78 is charged, the voltage VI at 69 is a function of the voltages at the output of the rhythm generator 19 and of the Darlington transistor 73. Since the amplification of the current by the Darlington transistor 73 is very strong, the current at the base of this transistor 73 is weak so that a low voltage drop appears between the resistors 70 and 72. This basic voltage V2 is periodically reduced to zero EM the diode 7 7 with the frequency of the frequency of the sounds . The capacitor 78 is at this time only slightly discharged via the resistor 70, so that V2 and V3 at 74 are also zero, which blocks the transistor 73. In the middle of the following period, Vl becomes equal at V2 and the Darlington transistor becomes conductive again, but alor-s V3 is slightly lower. This process continues until the capacitor 78 is not completely discharged and can no longer

  allow transistor 73 to become conductive again, which eliminates gong sounds.

  The principle of the circuit described thus produces the gongs of melodic character.

  The gong sounds are stopped until the capacitor 78 is charged again. When the voltage V2 at the output 32 of the rhythm generator circuit 19 becomes high, the capacitor 78 is charged by the intermediary of the diode 68. The resistor 44 and the diode 48 of the circuit 19 are such that 1 has pulsation ensuring ant the charge of the capacitor 78 does not last too long, so that the sound produced resonates

  like a gong sound that goes out slowly (compare Fig. 3). The transistor 18 deter-

  mine the switching on and off-circuit of the timing generator 19. As long as the voltage V5 is applied at 28, that is to say as long as the transistor 18 is

  driver, the timing generator circuit 1 9 remains energized.

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  Resistor 31 prevents the gong sounds from stopping suddenly. && moment when this excitation ceases because the capacitor 78 does not fully charge

  when said excitation ceases for the duration of a pulse. When the transistors-

  is no longer conductive, the gong sounds go out since the voltage Vl is then high. The capacitor 39 and the resistor 43 determine the frequency of the rhythm generator circuit 19. The resistor 27 serves to limit the intensity of the

  current and the capacitor 21 serves as protection in the event of voltage spikes

  could reach via the inputs 2,4, 11 at the base of the transistor 18. The resistance 22

  based on this transistor limits the intensity of the setting current.

  When a positive voltage is applied to the input 7, the capacitor 87 is charged via the resistance 1 04. As long as a negative potential is applied to the base of the transistor 81 via the point of connection 101, this

  transistor is conductive and allows a positive voltage to be applied to the base of the transistor

  tor 91. The latter transmits under the action of a transmitter a negative voltage to the connection point 89 connected to its collector. These conditions are maintained for as long

  that transistor 91 is conductive. When the capacitor 87 reaches approximate-

  the potential of the applied voltage, the current no longer flows. The transistor 91 then receives on its base, via the resistor 85, a negative voltage! 0 which also makes it nonconductive. We thus obtain a time constant defined by the capacitor 87 and the resistor 88. If we have, at the connection point, a voltage

  negative, there is also at output 8 a negative potential and the indicator lamp lights up.

  Diode 90 transmits a negative voltage to output 10 and from there to input 11 when

  the belt switch is closed so that the gong sounds are heard.

  If you open the belt switch 9 ,. these gong sounds stop well, but the indicator lamp continues to shine until the multivibrator stage acting on the connection point 89 erases the negative potential at this point. If we close again

  again the belt switch 9, we no longer hear the gong sounds.

  If the door closing switch 1-3 is closed, entry 11 is found in the

  2 negative potential and the gong sounds are heard again until first the door is closed again and secondly that no positive voltage is no longer applied to inputs 2 and 4. The indicator lamp 6 connected at output 8 can therefore no longer shine since no negative potential can no longer pass through diode 90. The rapid repetition determined by the monostable multivibrator stage is obtained by

  the presence at input 7 of external devices with low ohmic resistance. The Po-

  positive potential previously applied to capacitor 87 disappears through resistance

  104 in wire 80 and outdoor devices with low ohmic resistance.

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  Resistor 24 reduces input 11 to present a low ohmic resistance so that the gong sound only appears when current flows normally through input 11. The diode 16 serves as a logical link for control

outside the circuit.

  r The warning circuit allows very small construction of the type known for relay boxes. It is thus possible to arrange the connection plugs so that they can be introduced into the system

known grid of a relay.

Claims (10)

RESELL I CATIONS   1. Warning circuit for cars, monitoring the wearing of seat belts and lighting, this circuit associated with closing the door,   acoustic signal and to a pilot light and comprising an input on the interrup-   ignition, an input and an output on the switch controlled by the belt, -output connected to the door contact switch, an input and an output on the indicator lamp, an input on the light switch as well as earthing, being characterized by the fact that the acoustic signal 74 is controlled at the same time by two frequency generators, one of which 19, determines the frequency of sounds simulating the sounds of gong, while a terminal circuit 95 ensures the gradual melodic extinction of these gong sounds and that the indicator lamp 3 is connected to a monostable multivibrator 93 forcing this lamp to shines without flickering.   2. Warning circuit according to claim 1 characterized in that the terminal circuit 95 comprises a Darlington transistor 73 whose emitter is connected to the acoustic signal 74 and whose collector is connected to the inputs4. of the light switch 3 and 2 of the ignition switch ge 1, the base of this transistor being connected on the one hand to the generator of the frequency of sounds 53 by means of a resistor 72 and d 'a diode 77, and on the other hand by the   same resistor 72, another resistor 70 and another diode 68, generally   tor 19 of the rhythm at the repetition frequency, a capacitor 78 connected to a grounding wire tS being, moreover, mounted between this other resistor 70 and this other diode 68.   3. Warning circuit according to claim 1 and claim 2 characterized   by the fact that input 4 of the light switch 3 and input 2 of the inter-   light switch 1 are interconnected by diodes 25 and 16.   4. Warning circuit according to claim 3 characterized in that to ensure the stability of the voltage, is mounted following the diodes 25, 26 connected to the inputs of the lighting and ignition switches, a resistor 17, a   Zener diode 49 and a capacitor 5 1.   5. Warning circuit according to any one of the preceding claims   characterized by the fact that the monostable multivibrator 93 comprises a transist   tor 81 and is connected by its transmitter to input 7 of the positive supply voltage   tation and by its collector with two resistors 83, 85 connected in series and connected to ground while its base is connected, by the connection point 101 and a resistor 104, to the wire 80 receiving the positive voltage and, moreover, via the connection points 10, 8, to an RC element 87-88 beyond which is the connection point 24684.3   connection 89 connected by a diode 102 to the output 8 of the indicator lamp À, a condenser being provided between the connection point p recited 86 and another connection point 82 connected to the collector of this transistorsil 6. Warning circuit according to claim 5 characterized in that the connection point 89 located beyond the RC element 87-88 is further connected, on the one hand by a diode 90 to the output 10 and on the other hand to the collector of a transistor 91 whose base is connected to a connection point 84 located between the two resistors in series 83.85 and whose emitter is connected to wire 58 of Grounding.   7. Warning circuit according to any one of the preceding claims   characterized by the fact that the urate 19 of rhythm at the frequency of repet   tition of the gong sound can be switched on and off by a transistor 18, the emitter of which is connected to the inputs 2,4 of the ignition and light switches 1,3 and the glue of which is connected to the circuit of the rhythm generator 19 while its base is connected by a connection point 20 on the one hand to ground by the intermediary of a capacitor 21, and on the other hand by a resistor 22 at a point of connection 23 itself connected on the one hand by another resistor 24 to the inputs 4, 2 of the light switches   and 3.1 ignition, and other p art by a diode 26 at the input 11 of the inter- belt breaker 9.   8. Warning circuit according to any one of the preceding claims   characterized by the fact that the repetition frequency of the gong sounds depends on the values of the RC element 43,39 of the rhythm generator circuit 19 and that the frequency of the gong sounds depends on the values of the RC element 67 , 65 the tone generator 53.   9. Warning circuit according to any one of the preceding claims   characterized by the fact that it can be mounted entirely inside a very   small box having the dimensions of a conventional relay box.   10. Warning circuit according to claim 9 characterized in that the connection plugs of the housing can be introduced into the system usual grid of relays.