CN210133057U - Car backing buzzing warning system - Google Patents
Car backing buzzing warning system Download PDFInfo
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- CN210133057U CN210133057U CN201921028356.0U CN201921028356U CN210133057U CN 210133057 U CN210133057 U CN 210133057U CN 201921028356 U CN201921028356 U CN 201921028356U CN 210133057 U CN210133057 U CN 210133057U
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Abstract
The utility model provides a buzzing warning system backs a car, its characterized in that: the method comprises the following steps: the device comprises a distance measuring unit, a frequency control circuit, a square wave circuit, a power supply and a passive buzzer; the power supply unit is used for providing power and is respectively connected with the distance measuring unit, the frequency control circuit, the square wave circuit and the power supply end of the passive buzzer; the distance measuring unit is used for measuring the distance between the tail of the automobile and other obstacles when the automobile backs up, and the output end of the distance measuring unit is connected with the input end of the frequency control circuit; the frequency control circuit is used for receiving the output signal of the distance measuring unit and controlling the output frequency of the square wave circuit according to the output signal, and the output end of the frequency control circuit is connected with the input end of the square wave circuit; the square wave circuit is used for providing a square wave signal for driving the passive buzzer to sound, and the output end of the square wave circuit is connected with the passive buzzer; the utility model discloses can send the prompt tone of different frequencies according to the change of the distance of car afterbody and barrier.
Description
Technical Field
The utility model relates to an auto-parts especially relates to a buzzing warning system backs a car.
Background
The back-up buzzing warning system is an electronic accessory of an automobile, can provide reliable, stable, continuous and rhythmic warning sounds to remind pedestrians and vehicles when the automobile backs up, and is generally connected in parallel on a back-up light circuit. The sound frequency of the existing backing buzzer warning system is fixed, and the buzzer cannot send out warning sounds with different frequencies according to the actual distance between a vehicle body and a target object in the backing process, namely, when the distance between the vehicle body and the target object is smaller than the preset distance, the sound frequency is automatically increased so as to remind pedestrians/animals/vehicles behind to avoid in time, and meanwhile, a driver is reminded, the vehicle speed is slowed down, and observation is noticed.
Therefore, there is a need for a car backing buzzer warning system capable of sounding at different frequencies according to the distance between the vehicle and the target object.
SUMMERY OF THE UTILITY MODEL
The utility model provides a buzzer of backing a car realizes sending the buzzer of backing a car of the sound of different frequencies through the change of the distance of vehicle and target object with automatic control circuit.
The utility model provides a buzzing warning system backs a car, its characterized in that: the method comprises the following steps: the device comprises a distance measuring unit, a frequency control circuit, a square wave generating circuit, a power supply unit and a passive buzzer;
the distance measuring unit is used for measuring and outputting the distance between the tail of the automobile and the barrier when the automobile backs up, and the output end of the distance measuring unit is connected with the input end of the frequency control circuit;
the frequency control circuit is used for receiving the signal output by the distance measuring unit and outputting a frequency control signal according to the signal, and the output end of the frequency control circuit is connected with the input end of the square wave circuit;
the square wave generating circuit is used for receiving the frequency control signal output by the frequency control circuit and outputting a square wave with corresponding frequency according to the frequency control signal, and the output end of the square wave generating circuit is connected with the passive buzzer;
the power supply unit is used for providing working direct current for the distance measuring unit, the frequency control circuit, the square wave circuit and the passive buzzer;
the square wave circuit comprises a chip MAX038, a frequency modulation circuit connected with the chip MAX038, a first voltage reduction circuit and a second voltage reduction circuit;
the frequency modulation circuit comprises a capacitor C1, a capacitor C2 and a capacitor C3, one end of the capacitor C1 is connected with a COSC pin of a chip MAX038, the other end of the capacitor C1 is grounded, one end of the capacitor C2 is connected with the COSC pin of the chip MAX038, the other end of the capacitor C2 is grounded, one end of the capacitor C3 is connected with the COSC pin of the chip MAX038, and the other end of the capacitor C3 is grounded.
Further, the frequency control circuit comprises a relay J1, a relay J2, a comparator U1, a comparator U2, a triode Q2, a triode Q3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a resistor R12,
one end of a resistor R4 is connected with the output end of the distance measuring unit, the other end of the resistor R4 is grounded, one end of a resistor R5 is connected with a power supply end, the other end of the resistor R5 is grounded through a resistor R6, the in-phase end of a comparator U1 is connected with the common connection point of the resistor R4 and the output end of the distance measuring unit, the inverting end of a comparator U1 is connected with the common connection point of a resistor R5 and a resistor R6, the output end of the comparator U1 is connected with the base of a triode Q2 through a resistor R7, the collector of the triode Q2 is connected with the power supply end through a resistor R8, the emitter of the triode Q2 is connected with one end of an excitation coil of a relay J1, the other end of the excitation coil of the relay J1 is grounded, one end of the resistor R10 is connected with the power supply end, the other end of the resistor R10 is grounded through a resistor R9, the in-phase end of, the inverting terminal of the comparator U2 is connected with the common connection point of the resistor R10 and the resistor R9, the output terminal of the comparator U2 is connected with the base electrode of the triode Q3 through the resistor R11, the collector electrode of the triode Q3 is connected with the power supply terminal through the resistor R12, the emitter electrode of the triode Q3 is connected with one end of the excitation coil of the relay J2, the other end of the excitation coil of the relay J2 is grounded, wherein the relay J1 and the relay J2 are normally open relays, and the triode Q2 and the triode Q3 are NPN type triodes.
Further, the frequency modulation circuit also comprises an amplifying circuit and a protection circuit, wherein the amplifying circuit comprises a resistor R1, a resistor R2, a triode Q1 and a capacitor C8,
the collector of the triode Q1 is connected with a power supply end through a resistor R2, the base of the triode Q1 is connected with the power supply end through a resistor R1, the common connection point of the base of the triode Q1 and the resistor R1 is connected with the OUT pin of the chip MAX038, the emitter of the triode Q1 is connected with one end of a capacitor C8, the other end of the capacitor C8 serves as the output end of a frequency modulation circuit, and the triode Q1 is an NPN type triode.
Further, the protection circuit comprises a diode D1, the anode of the diode D1 is connected with the OUT pin of the chip MAX038, and the cathode of the diode D1 is connected with the common connection point of the base of the triode Q1 and the resistor R1.
Further, the first voltage reduction circuit is a three-terminal voltage stabilization chip 7805.
Further, the second voltage reduction circuit is a three-terminal voltage stabilization chip 7905.
Further, the distance measuring unit is a microwave radar sensor.
The utility model has the advantages of: the change of the distance between the tail of the automobile and the obstacle is reflected by the change of the sound frequency of the three-gear passive buzzer, so that the attention of people, objects, automobiles and drivers around the automobile is reminded; meanwhile, the driver can predict the distance between the automobile and the obstacle according to the sound frequency of the passive buzzer, so that the driving safety of the automobile during reversing is improved.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a block diagram of the present invention.
Fig. 2 is a schematic diagram of the square wave circuit of the present invention.
Fig. 3 is a schematic diagram of the frequency control circuit of the present invention.
Detailed Description
The invention is further explained by the following combined with the attached drawings of the specification:
the utility model provides a buzzing warning system backs a car, its characterized in that: the method comprises the following steps: the device comprises a distance measuring unit, a frequency control circuit, a square wave generating circuit, a power supply unit and a passive buzzer;
the distance measuring unit is used for measuring and outputting the distance between the tail of the automobile and the barrier when the automobile backs up, and the output end of the distance measuring unit is connected with the input end of the frequency control circuit;
the frequency control circuit is used for receiving the signal output by the distance measuring unit and outputting a frequency control signal according to the signal, and the output end of the frequency control circuit is connected with the input end of the square wave circuit;
the square wave generating circuit is used for receiving the frequency control signal output by the frequency control circuit and outputting a square wave with corresponding frequency according to the frequency control signal, and the output end of the square wave generating circuit is connected with the passive buzzer;
the power supply unit is used for providing working direct current for the distance measuring unit, the frequency control circuit, the square wave circuit and the passive buzzer;
the power supply unit is connected with the automobile storage battery, and when the automobile is in reverse gear, the power supply unit is communicated with the automobile storage battery so as to supply power to the distance measuring unit, the frequency control circuit, the square wave circuit and the passive buzzer; the passive buzzer adopts the existing passive buzzer, the distance measuring unit has the following characteristics that when the distance between the automobile and the obstacle is longer, the current signal output by the distance measuring unit is weaker, otherwise, when the distance between the automobile and the obstacle is shorter, the electric signal output by the microwave radar sensor is gradually enhanced, and the current signal output by the distance measuring unit is in inverse proportion to the distance between the automobile and the obstacle; the existing microwave radar sensor with current signals as output signals can be adopted, when the microwave radar sensor converts the distance between an automobile and an obstacle into electric signals to be output, such as a laser radar scanner ranging sensor of a large group of lasers, a person skilled in the art can select a proper distance measuring sensor according to factors such as actual precision, project cost and the like;
the square wave circuit comprises a chip MAX038, a frequency modulation circuit connected with the chip MAX038, a first voltage reduction circuit and a second voltage reduction circuit;
the frequency modulation circuit comprises a capacitor C1, a capacitor C2 and a capacitor C3, one end of the capacitor C1 is connected with a COSC pin of a chip MAX038, the other end of the capacitor C1 is grounded, one end of the capacitor C2 is connected with the COSC pin of the chip MAX038, the other end of the capacitor C2 is grounded, one end of the capacitor C3 is connected with the COSC pin of the chip MAX038, and the other end of the capacitor C3 is grounded.
The working principle is as follows:
MAX038 is a precise high-frequency waveform generator, which can precisely generate triangular waves, sawtooth waves, rectangular waves (including square waves) and sinusoidal signals, the frequency range of the generator is from 0.1HZ to 20MHZ, the duty ratio and the frequency of the generator can be independently adjusted, MAX038 is used as a mature chip and has a clearly completed use instruction and a pin instruction, and a person skilled in the art can connect each pin of MAX038 according to the specification and the pin instruction of MAX 038; in this embodiment, a square wave of 1KHZ to 4KHZ is selected, the square wave is selected through pin a1 or pin a0 of MAX038, the output frequency of MAX038 is controlled by the capacitance of the COSC pin through a frequency control circuit whether the capacitor C1, the capacitor C2, and the capacitor C3 are connected to the COSC pin of MAX038, so as to change the capacitance of the capacitor connected to the COSC pin, and when the capacitor C1 is connected to the COSC pin of MAX038, the capacitance of the COSC pin of MAX038 is the capacitance of the capacitor C1; when the capacitor C1 and the capacitor C2 are connected in parallel to the COSC pin of MAX038, the capacitance value of the COSC pin of MAX038 is the capacitance value of the capacitor C1 and the capacitor C2 which are connected in parallel; similarly, when the capacitor C1, the capacitor C2, the capacitor C3, the parallel capacitor C2 and the capacitor C3 are connected in parallel to the COSC pin of MAX038, the capacitance value of the COSC pin of MAX038 is the capacitance value of the parallel capacitor C1, the capacitor C2 and the capacitor C3; i.e. the frequency modulation circuit is capable of providing frequencies in three frequency bands. The sound frequency of the passive buzzer is corresponded to by a preset distance, for example, when the distance between the automobile and the barrier is larger than C, the capacitor C1 is connected to the COSC pin of MAX038, and the frequency is the first sound frequency; when the distance between the automobile and the obstacle is smaller than or equal to C and larger than B, the capacitor C1 and the capacitor C2 are connected in parallel to a COSC pin of MAX038, and the frequency of the second-gear sound is obtained; when the distance between the automobile and the obstacle is smaller than B, the capacitor C1, the capacitor C2 and the capacitor C3 are connected in parallel to a COSC pin of MAX038, and the frequency of third-gear sound is obtained.
The working principle of the utility model is as follows: when the automobile is in reverse gear, the power supply unit is powered on to supply power to the distance measuring unit, the frequency control circuit, the square wave circuit and the passive buzzer, when the automobile enters reverse gear, the capacitor C1 provides reference frequency for the square wave circuit, and the passive buzzer makes a first-gear sound frequency to remind people, animals or vehicles behind or around the automobile of paying attention; when the distance between the tail of the automobile and the barrier, which is measured by the distance measuring unit, is less than or equal to C and greater than B, the frequency control circuit controls the capacitor C2 to be connected to the COSC pin of MAX038, so that the frequency of the square wave circuit is increased by one gear, the passive buzzer sounds at the second gear sound frequency, surrounding people and vehicles are further reminded of paying attention through the change of the sound frequency, a driver is reminded of paying attention, the speed of the automobile is slowed down, and the surrounding conditions of the automobile are observed; further, when the distance between the tail of the automobile and the obstacle, measured by the distance measuring unit, is smaller than B, the frequency control circuit controls the capacitor C3 to be connected to the COSC pin of MAX038, so that the frequency of the square wave circuit is continuously increased by one gear, the passive buzzer sounds a third gear with a sound frequency to remind surrounding people and vehicles of paying attention, and meanwhile, drivers are reminded of paying attention to further slow down the automobile and watching the surrounding conditions of the automobile closely; the three-gear frequency of the sound emitted by the backing buzzer warning system reminds people or objects around and the distance between the automobile and the barrier of a driver, so that the safety of the automobile during backing is improved.
Above-mentioned technical scheme reflects the change of the distance of car afterbody and obstacle through the change that sets up three fender passive buzzer sound frequency to remind people, thing, car and navigating mate's around the car attention, navigating mate still can predict the distance of car and obstacle according to the sound frequency of passive buzzer simultaneously, thereby promote the driving safety when the car is backed.
In the embodiment, the frequency control circuit comprises a relay J1, a relay J2, a comparator U1, a comparator U2, a triode Q2, a triode Q3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a resistor R12,
one end of a resistor R4 is connected with the output end of the distance measuring unit, the other end of the resistor R4 is grounded, one end of a resistor R5 is connected with a power supply end, the other end of the resistor R5 is grounded through a resistor R6, the in-phase end of a comparator U1 is connected with the common connection point of the resistor R4 and the output end of the distance measuring unit, the inverting end of a comparator U1 is connected with the common connection point of a resistor R5 and a resistor R6, the output end of the comparator U1 is connected with the base of a triode Q2 through a resistor R7, the collector of the triode Q2 is connected with the power supply end through a resistor R8, the emitter of the triode Q2 is connected with one end of an excitation coil of a relay J1, the other end of the excitation coil of the relay J1 is grounded, one end of the resistor R10 is connected with the power supply end, the other end of the resistor R10 is grounded through a resistor R9, the in-phase end of, the inverting terminal of the comparator U2 is connected with the common connection point of the resistor R10 and the resistor R9, the output terminal of the comparator U2 is connected with the base electrode of the triode Q3 through the resistor R11, the collector electrode of the triode Q3 is connected with the power supply terminal through the resistor R12, the emitter electrode of the triode Q3 is connected with one end of the excitation coil of the relay J2, the other end of the excitation coil of the relay J2 is grounded, wherein the relay J1 and the relay J2 are normally open relays, and the triode Q2 and the triode Q3 are NPN type triodes.
The working principle is as follows: the microwave radar sensor converts the distance between the automobile and the obstacle into an electric signal to be output, when the distance between the automobile and the obstacle is longer, the current signal output by the microwave radar sensor is weaker, and on the contrary, when the distance between the automobile and the obstacle is shorter, the electric signal output by the microwave radar sensor is gradually strengthened; the current signal output by the microwave radar sensor is converted into voltage at two ends of a resistor R4 after passing through a resistor R4, the voltage at two ends of the resistor R4 is inversely proportional to the distance between an obstacle and an automobile, when the distance between the automobile and the obstacle is longer, the voltage at two ends of the resistor R4 is smaller, and when the distance between the automobile and the obstacle is shorter, the voltage at two ends of the resistor R4 is larger; the reverse phase end of the comparator U1 provides reference voltage of the second-gear sound frequency for the comparator, when the voltage at the two ends of the R4 is larger than the second-gear sound reference voltage at the reverse phase end of the U1, the comparator U1 outputs high level, the triode Q2 is conducted, so that the magnet exciting coil of the relay J1 is electrified, the normally open switch of the relay J1 is closed, the capacitor C2 is connected to the COSC pin of MAX038, and the frequency control circuit controls the square wave circuit to output square waves of the second-gear sound frequency; the reverse phase end of the comparator U2 provides reference voltage of third-gear sound frequency for the comparator, when the voltage at the two ends of the R4 is larger than the third-gear sound reference voltage at the reverse phase end of the U2, the comparator U2 outputs high level, the triode Q3 is conducted, so that the magnet exciting coil of the relay J2 is electrified, the normally open switch of the relay J2 is closed, the capacitor C3 is connected to the COSC pin of MAX038, and the frequency control circuit controls the square wave circuit to output square waves of the third-gear sound frequency;
in this embodiment, the frequency modulation circuit further includes an amplifying circuit and a protection circuit, the amplifying circuit includes a resistor R1, a resistor R2, a transistor Q1, and a capacitor C8,
the collector of the triode Q1 is connected with a power supply end through a resistor R2, the base of the triode Q1 is connected with the power supply end through a resistor R1, the common connection point of the base of the triode Q1 and the resistor R1 is connected with the OUT pin of the chip MAX038, the emitter of the triode Q1 is connected with one end of a capacitor C8, the other end of the capacitor C8 serves as the output end of a frequency modulation circuit, and the triode Q1 is an NPN type triode. The resistor R1, the resistor R2 and the triode Q1 form an amplifying circuit, and the amplifying circuit is used for amplifying the power of the square wave signal output by the OUT pin of MAX038 to drive the passive buzzer to sound; the capacitor C8 is used to block the direct current power supply and only allow the square wave circuit to pass through, so that the amplifying circuit can only amplify the square wave signal.
In this embodiment, the protection circuit includes a diode D1, an anode of the diode D1 is connected to the OUT pin of the chip MAX038, and a cathode of the diode D1 is connected to a common connection point of the base of the transistor Q1 and the resistor R1. The diode D1 mainly functions to prevent the current of the amplifier circuit of the OUT pin from flowing back to the chip, prevent the chip from burning OUT, and protect the chip.
In this embodiment, the first voltage-reducing circuit is a three-terminal regulator chip 7805 configured to convert a 12V voltage provided by the vehicle battery into a 5V voltage. The second voltage reduction circuit is a three-terminal voltage stabilization chip 7905 and is used for converting 12V voltage provided by the automobile storage battery into-5V voltage, so that a stable working power supply is provided for the chip MAX 038.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The utility model provides a buzzing warning system backs a car which characterized in that: the method comprises the following steps: the device comprises a distance measuring unit, a frequency control circuit, a square wave generating circuit, a power supply unit and a passive buzzer;
the distance measuring unit is used for measuring and outputting the distance between the tail of the automobile and the barrier when the automobile backs up, and the output end of the distance measuring unit is connected with the input end of the frequency control circuit;
the frequency control circuit is used for receiving the signal output by the distance measuring unit and outputting a frequency control signal according to the signal, and the output end of the frequency control circuit is connected with the input end of the square wave circuit;
the square wave generating circuit is used for receiving the frequency control signal output by the frequency control circuit and outputting a square wave with corresponding frequency according to the frequency control signal, and the output end of the square wave generating circuit is connected with the passive buzzer;
the power supply unit is used for providing working direct current for the distance measuring unit, the frequency control circuit, the square wave circuit and the passive buzzer;
the square wave generating circuit comprises a chip MAX038, a frequency modulation circuit connected with the chip MAX038, a first voltage reduction circuit and a second voltage reduction circuit;
the frequency modulation circuit comprises a capacitor C1, a capacitor C2 and a capacitor C3, one end of the capacitor C1 is connected with a COSC pin of a chip MAX038, the other end of the capacitor C1 is grounded, one end of the capacitor C2 is connected with the COSC pin of the chip MAX038, the other end of the capacitor C2 is grounded, one end of the capacitor C3 is connected with the COSC pin of the chip MAX038, and the other end of the capacitor C3 is grounded.
2. The reverse buzzer warning system of claim 1, wherein: the frequency control circuit comprises a relay J1, a relay J2, a comparator U1, a comparator U2, a triode Q2, a triode Q3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a resistor R12,
one end of a resistor R4 is connected with the output end of the distance measuring unit, the other end of the resistor R4 is grounded, one end of a resistor R5 is connected with a power supply end, the other end of the resistor R5 is grounded through a resistor R6, the in-phase end of a comparator U1 is connected with the common connection point of the resistor R4 and the output end of the distance measuring unit, the inverting end of a comparator U1 is connected with the common connection point of a resistor R5 and a resistor R6, the output end of the comparator U1 is connected with the base of a triode Q2 through a resistor R7, the collector of the triode Q2 is connected with the power supply end through a resistor R8, the emitter of the triode Q2 is connected with one end of an excitation coil of a relay J1, the other end of the excitation coil of the relay J1 is grounded, one end of the resistor R10 is connected with the power supply end, the other end of the resistor R10 is grounded through a resistor R9, the in-phase end of, the inverting terminal of the comparator U2 is connected with the common connection point of the resistor R10 and the resistor R9, the output terminal of the comparator U2 is connected with the base electrode of the triode Q3 through the resistor R11, the collector electrode of the triode Q3 is connected with the power supply terminal through the resistor R12, the emitter electrode of the triode Q3 is connected with one end of the excitation coil of the relay J2, the other end of the excitation coil of the relay J2 is grounded, wherein the relay J1 and the relay J2 are normally open relays, and the triode Q2 and the triode Q3 are NPN type triodes.
3. The reverse buzzer warning system of claim 1, wherein: the frequency modulation circuit also comprises an amplifying circuit and a protection circuit, wherein the amplifying circuit comprises a resistor R1, a resistor R2, a triode Q1 and a capacitor C8,
the collector of the triode Q1 is connected with a power supply end through a resistor R2, the base of the triode Q1 is connected with the power supply end through a resistor R1, the common connection point of the base of the triode Q1 and the resistor R1 is connected with the OUT pin of the chip MAX038, the emitter of the triode Q1 is connected with one end of a capacitor C8, the other end of the capacitor C8 serves as the output end of a frequency modulation circuit, and the triode Q1 is an NPN type triode.
4. The reverse buzzer warning system of claim 3, wherein: the protection circuit comprises a diode D1, the anode of a diode D1 is connected with the OUT pin of the chip MAX038, and the cathode of a diode D1 is connected with the common connection point of the base of the triode Q1 and the resistor R1.
5. The reverse buzzer warning system of claim 1, wherein: the first voltage reduction circuit is a three-terminal voltage stabilization chip 7805.
6. The reverse buzzer warning system of claim 1, wherein: the second voltage reduction circuit is a three-terminal voltage stabilization chip 7905.
7. The reverse buzzer warning system of claim 1, wherein: the distance measuring unit is a microwave radar sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921028356.0U CN210133057U (en) | 2019-07-03 | 2019-07-03 | Car backing buzzing warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921028356.0U CN210133057U (en) | 2019-07-03 | 2019-07-03 | Car backing buzzing warning system |
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| CN210133057U true CN210133057U (en) | 2020-03-10 |
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| CN201921028356.0U Active CN210133057U (en) | 2019-07-03 | 2019-07-03 | Car backing buzzing warning system |
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