CN112918380A - Reversing safety detection device for special vehicle - Google Patents
Reversing safety detection device for special vehicle Download PDFInfo
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- CN112918380A CN112918380A CN202110346502.XA CN202110346502A CN112918380A CN 112918380 A CN112918380 A CN 112918380A CN 202110346502 A CN202110346502 A CN 202110346502A CN 112918380 A CN112918380 A CN 112918380A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
- B60Q9/008—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for anti-collision purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
- B60Q9/002—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle
- B60Q9/004—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle using wave sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
- B60Q9/002—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle
- B60Q9/004—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle using wave sensors
- B60Q9/006—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle using wave sensors using a distance sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Mechanical Engineering (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Transportation (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a reversing safety detection device for a special vehicle, which effectively solves the problem that the reversing radar of the special vehicle influences the running safety of the special vehicle due to short acting distance and unstable effect.
Description
Technical Field
The invention relates to the field of vehicle detection, in particular to a reversing safety detection device for a special vehicle.
Background
Vehicles such as special vehicles, engineering vehicles, port and dock working vehicles and the like undertake tasks which cannot be undertaken by common vehicles, and the running safety of the vehicles is also a very important factor because the vehicles work in special environments and dangerous environments. Because the automobile body of this kind of vehicle is great, for avoiding the influence of sight blind area to driver when backing a car as far as possible, generally set up ultrasonic wave radar of backing a car to detect the existence of barrier, and then supplementary driver's work of backing a car.
However, in the working environment of a special vehicle, the electromagnetic environment is extremely complex, and in severe environments such as rain, snow, fog and other weather conditions, the ultrasonic reversing radar has short range and unstable effect, which affects the judgment of the driver on the road condition when reversing, and affects the driving safety of the special vehicle.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a reversing safety detection device for a special vehicle, which effectively solves the problem that the running safety of the special vehicle is influenced due to the fact that a reversing radar of the special vehicle is short in action distance and unstable in effect.
The technical scheme includes that the reversing safety detection device for the special vehicle comprises a signal receiving circuit and a signal processing circuit, the signal receiving circuit enables ultrasonic signals detected in a blind area of the special vehicle by an ultrasonic sensor U1 to pass through a filter and a subtracter to obtain difference signals, the signal receiving circuit transmits the difference signals and the ultrasonic signals to the signal processing circuit, the signal processing circuit receives the ultrasonic signals and the difference signals by the aid of an adder to obtain standard signals, and a controller is started by the standard signals.
Further, the signal receiving circuit comprises a filter and a subtracter, the filter filters the ultrasonic signals detected in the blind area of the special vehicle by the ultrasonic sensor U1, the filtered ultrasonic signals obtain difference signals by the subtracter, and the difference signals and the ultrasonic signals are transmitted to the signal processing circuit.
Furthermore, the filter comprises a resistor R1, one end of the resistor R1 is connected with an out pin of the ultrasonic sensor U1, the other end of the resistor R1 is respectively connected with one end of a capacitor C1 and one end of an inductor L1, the other end of the inductor L1 is respectively connected with one end of a capacitor C2 and one end of an inductor L3, the other end of the inductor L3 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with one end of the capacitor C6, one end of an inductor L2 and a base of a triode Q1, one end of a resistor R2, a collector of a triode Q1 are respectively connected with the other end of the resistor R2 and a VCC pin of the ultrasonic sensor U1 and connected with a positive power supply VCC, an emitter of the triode Q1 is connected with one end of a resistor R4, and the other end of a resistor R4 is respectively connected with the other end of an inductor L2, the other end of a capacitor C2, the other end of a capacitor C1 and a gnd pin of the ultrasonic sensor U1 and connected with the ground in parallel.
Furthermore, the subtractor comprises an inductor L4, one end of the inductor L4 is connected to an emitter of a transistor Q1 in the filter and one end of a resistor R4, the other end of the inductor L4 is connected to one end of a capacitor C5, an anode of a varactor D1 and one end of a resistor R5, the other end of the resistor R5 is connected to one end of a resistor R6 and a non-inverting end of an operational amplifier U2B, an inverting end of the operational amplifier U2B is connected to one end of a variable resistor R7 and one end of a resistor R3, the other end of the resistor R3 is connected to the other end of a capacitor C5, a cathode of a varactor D1, the other end of a resistor R6 and the other end of an inductor L2 in the filter, and is grounded, and the other end of the variable resistor R7 is connected to a positive collector of a transistor Q1 in the filter and is connected to.
Further, the signal processing circuit comprises an adder and a controller, the adder receives the difference signal and the ultrasonic signal transmitted by the signal receiving circuit, the difference signal and the ultrasonic signal obtain a standard signal on the adder, and the standard signal starts the controller.
Furthermore, the adder includes a resistor R10, one end of the resistor R10 is connected to the output end of the operational amplifier U2B in the signal receiving circuit, the other end of the resistor R10 is connected to one end of the resistor R11 and the non-inverting end of the operational amplifier U3B, the other end of the resistor R11 is connected to one end of the resistor R5 in the signal receiving circuit, the inverting end of the operational amplifier U3B is connected to one end of the resistor R8 and one end of the resistor R9, and the other end of the resistor R8 is connected to the other end of the resistor R6 in the signal receiving circuit and grounded.
Further, the controller comprises a voltage regulator tube D2, the cathode of the voltage regulator tube D2 is respectively connected with one end of a resistor R14, the base of a triode Q2, the ECU, the other end of the resistor R9 in the adder and the output end of an operational amplifier U3B, the emitter of the triode Q2 is respectively connected with the other end of the resistor R14 and one end of the resistor R12, the other end of a variable resistor R7 in the signal receiving circuit is connected with a positive polarity power supply VCC, the collector of a triode Q2 is respectively connected with one end of a relay K1, one end of a switch S1 and the emergency braking mechanism, the other end of the relay K1 is connected with one end of a resistor R13 and is grounded, the other end of a switch S1 is respectively connected with the anode of a voltage regulator D2 and the base of the triode Q3, the collector of a triode Q3 is connected with one end of a buzzer B1, the other end of the buzzer B1 is connected with the other end of the resistor R12, and the emitter of the triode Q3 is connected with the other end of the resistor R13.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
the ultrasonic signal voltage compensation method has the advantages that the ultrasonic signal voltage compensation method can accurately compensate the voltage value of the ultrasonic signal which is filtered by the inductor L3, the capacitor C4, the inductor L2 and the capacitor C6 and further filtered by the inductor L4, the variable capacitance diode D1 and the capacitor C5 through the subtracter with the operational amplifier U2B as the core and the adder with the operational amplifier U3B as the core, accurately represent the distance between an obstacle and a special vehicle, avoid the existence of errors, avoid the loss caused by the influence of the Q value of a resonant cavity of the filter on the amplitude of the ultrasonic signal, realize the purpose that the obtained ultrasonic signal is pure and has no interference, avoid the influence of the bad weather such as rain, snow, fog and the like on the ultrasonic signal and cause the problem of low accuracy on the ultrasonic signal, and simultaneously ensure the safety of the special vehicle by the controllers with the stabilivolt D2, the triode Q3 and the triode Q2 as the core, the method reminds the driver of adjusting the reversing direction, avoids influencing the running safety of the special vehicle, and also avoids the problem that the reversing radar of the special vehicle influences the running safety of the special vehicle due to short acting distance and unstable effect.
Drawings
FIG. 1 is a schematic view of a specialty vehicle and installed reversing radar.
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and functional aspects of the present invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying figures 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A reversing safety detection device for a special vehicle is applied to the tail of the special vehicle, the signal receiving circuit comprises a filter and a subtracter, the filter receives an ultrasonic signal detected by an ultrasonic sensor U1 through a resistor R1, an impedance matching circuit consisting of an inductor L1, a capacitor C1 and a capacitor C2 is used for impedance matching of the ultrasonic signal, a band-pass filter consisting of an inductor L3, a capacitor C4, an inductor L2 and a capacitor C6 is used for band-pass filtering of the ultrasonic signal, the filtered ultrasonic signal is subjected to follow-up processing through a triode Q1, the capacity of the ultrasonic signal for driving a post-stage circuit is improved, the ultrasonic signal is transmitted to the subtracter and a signal processing circuit, the subtracter performs further filtering processing on the ultrasonic signal through the inductor L4, a varactor D1 and the capacitor C5 to improve the accuracy of the ultrasonic signal, the resistor R5 transmits the ultrasonic signal after further filtering to the subtractor, the subtraction is performed with the voltage value provided by the resistor R3 and the variable resistor R7, the voltage value provided by the resistor R3 and the variable resistor R7 is equal to the voltage value of the ultrasonic signal transmitted to the band-pass filter composed of the inductor L3, the capacitor C4, the inductor L2 and the capacitor C6, the difference signal output by the subtractor is the loss caused by the Q value of the resonant cavity of the band-pass filter composed of the inductor L3, the capacitor C4, the inductor L2 and the capacitor C6 when the ultrasonic signal is filtered, the difference signal is transmitted to the signal processing circuit, the adder receives the difference signal and the ultrasonic signal, the difference signal and the ultrasonic signal are added by the operational amplifier U3B to obtain the alarm signal, the precise compensation after filtering the ultrasonic signal is realized, and the ultrasonic signal is transmitted to the controller, meanwhile, an alarm signal is transmitted to an ECU to remind a driver that an obstacle exists at the tail of the special vehicle and the special vehicle needs to stop, when the triode Q2 is conducted by the alarm signal, the amplitude of the alarm signal is weak, namely the obstacle is close to the tail of the special vehicle and is easy to be dangerous, at the moment, the triode Q2 conducts the relay K1, and simultaneously the emergency braking mechanism is started to realize the emergency braking of the special vehicle and ensure the safety of the special vehicle, the switch S1 is switched from a disconnected state to a closed state, wherein the switch S1 is a pin switch of the relay K1, the triode Q3 is conducted, the buzzer B1 is started to alarm, the driver is reminded to adjust the direction of backing the special vehicle, when the voltage stabilizing tube D2 is conducted by the alarm signal and indicates that the obstacle is further away from the tail of the special vehicle, the voltage stabilizing tube D2 conducts the triode Q3, the triode Q3 starts the buzzer B1 to alarm, reminding a driver of adjusting the reversing direction to avoid influencing the running safety of the special vehicle;
the signal receiving circuit comprises a filter and a subtracter, wherein the filter receives an ultrasonic signal detected by an ultrasonic sensor U1 through a resistor R1, when the ultrasonic sensor U1 receives the ultrasonic signal, an obstacle is detected, the ultrasonic sensor U1 adopts an ultrasonic sensor with a model similar to MB1010, the ultrasonic sensor is the prior art, and not described in more detail herein, the impedance matching circuit composed of an inductor L1, a capacitor C1 and a capacitor C2 is used for carrying out impedance matching on the ultrasonic signal so as to realize complete reception of the ultrasonic signal, loss caused by impedance mismatching between the ultrasonic sensor U1 and the filter is avoided, the band-pass filter composed of the inductor L3, the capacitor C4, the inductor L2 and the capacitor C6 is used for carrying out band-pass filtering on the ultrasonic signal, and interference caused by signals with other frequencies except the frequency band of the ultrasonic signal is filtered, the ultrasonic signal accuracy is prevented from being influenced by the complexity of the electromagnetic environment, for example, signals sent by other sensors mounted on a special vehicle or signals sent by a mobile phone of a driver, the filtered ultrasonic signals are followed by a triode Q1, the capacity of driving a post-stage circuit by the ultrasonic signals is improved, the ultrasonic signals are transmitted to a subtracter and a signal processing circuit, the subtracter firstly carries out further filtering processing on the ultrasonic signals by an inductor L4, a variable capacitance diode D1 and a capacitor C5, clutter in a frequency band where the ultrasonic signals are located is filtered, clutter caused by multipath effect under the severe environment such as rain, snow, fog and the like of the ultrasonic signals is filtered, the accuracy of the ultrasonic signals is further improved, the judgment of the road condition of the driver is prevented from being influenced, and the ultrasonic signals after further filtering are transmitted to the subtracter by a resistor R5, subtraction is carried out on the voltage values provided by the resistor R3 and the variable resistor R7, the voltage values provided by the resistor R3 and the variable resistor R7 are equal to the voltage value of the ultrasonic signal transmitted to the band-pass filter consisting of the inductor L3, the capacitor C4, the inductor L2 and the capacitor C6, the difference signal output by the subtractor is the loss caused by the Q value of the resonant cavity of the band-pass filter consisting of the inductor L3, the capacitor C4, the inductor L2 and the capacitor C6 when the ultrasonic signal is filtered, and the difference signal is transmitted to the signal processing circuit;
the filter comprises a resistor R1, one end of the resistor R1 is connected with an out pin of the ultrasonic sensor U1, the other end of the resistor R1 is respectively connected with one end of a capacitor C1 and one end of an inductor L1, the other end of the inductor L1 is respectively connected with one end of a capacitor C2 and one end of an inductor L3, the other end of the inductor L3 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with one end of a capacitor C6, one end of an inductor L2, a base of a triode Q1 and one end of a resistor R2, a collector of a triode Q1 is respectively connected with the other end of a resistor R2 and a VCC pin of an ultrasonic sensor U1 and is connected with a positive power supply VCC, an emitter of a triode Q1 is connected with one end of a resistor R4, the other end of a resistor R4 is respectively connected with the other end of an inductor L4, the other end of a capacitor C;
the subtractor comprises an inductor L4, one end of the inductor L4 is connected with an emitter of a triode Q1 in the filter and one end of a resistor R4, the other end of the inductor L4 is connected with one end of a capacitor C5, an anode of a varactor D1 and one end of a resistor R5, the other end of the resistor R5 is connected with one end of a resistor R6 and a same-phase end of an operational amplifier U2B, an inverting end of the operational amplifier U2B is connected with one end of a variable resistor R7 and one end of a resistor R3, the other end of the resistor R3 is connected with the other end of the capacitor C5, a cathode of the varactor D1, the other end of the resistor R6 and the other end of an inductor L2 in the filter and is grounded, and the other end of the variable resistor R7 is connected with a collector of the triode Q1 in the filter and is connected with;
the signal processing circuit comprises an adder and a controller, the adder receives a difference signal transmitted by the signal receiving circuit by using a resistor R10, receives an ultrasonic signal transmitted by the signal receiving circuit by using a resistor R11, and adds the difference signal and the ultrasonic signal by using an operational amplifier U3B to obtain an alarm signal, wherein the alarm signal is the ultrasonic signal after precise compensation is realized, precise compensation after band-pass filtering is realized on the ultrasonic signal, the distance between an obstacle and a special vehicle is accurately represented, the existence of an error is avoided, the loss caused by the influence of the Q value of a resonant cavity of a band-pass filter on the amplitude of the ultrasonic signal is avoided, the purpose that the obtained ultrasonic signal is purer and has no interference is realized, at the moment, the alarm signal is transmitted to the controller, and meanwhile, the alarm signal is transmitted to an ECU, so that a driver is reminded that the obstacle exists at the tail part of the special vehicle, a shutdown is required, when the alarm signal turns on transistor Q2, indicating that the alarm signal is of a weak amplitude, namely, the obstacle is close to the tail of the special vehicle and is easy to be dangerous, at the moment, the triode Q2 conducts the relay K1, meanwhile, the emergency brake mechanism is opened to realize the emergency brake of the special vehicle and ensure the safety of the special vehicle, the switch S1 is switched from the open state to the closed state, wherein the switch S1 is a pin switch of the relay K1, the triode Q3 is conducted, the buzzer B1 is started to give an alarm to remind a driver of adjusting the reversing direction, when the warning signal conducts the voltage-regulator tube D2, the fact that the distance between the barrier and the tail of the special vehicle is a little is indicated, the voltage-regulator tube D2 conducts the triode Q3, the triode Q3 starts the buzzer B1 to give an alarm, a driver is reminded of adjusting the reversing direction, and the driving safety of the special vehicle is prevented from being influenced;
the adder comprises a resistor R10, one end of a resistor R10 is connected with the output end of an operational amplifier U2B in the signal receiving circuit, the other end of the resistor R10 is respectively connected with one end of a resistor R11 and the same-phase end of an operational amplifier U3B, the other end of a resistor R11 is connected with one end of a resistor R5 in the signal receiving circuit, the reverse-phase end of the operational amplifier U3B is respectively connected with one end of a resistor R8 and one end of a resistor R9, and the other end of the resistor R8 is connected with the other end of the resistor R6 in the signal receiving circuit and grounded;
the controller comprises a voltage regulator tube D2, the cathode of the voltage regulator tube D2 is respectively connected with one end of a resistor R14, the base of a triode Q2 and an ECU, the other end of the resistor R9 in the adder and the output end of an operational amplifier U3B, the emitter of the triode Q2 is respectively connected with the other end of the resistor R14 and one end of the resistor R12, the other end of a variable resistor R7 in the signal receiving circuit is connected with a positive polarity power supply VCC, the collector of a triode Q2 is respectively connected with one end of a relay K1, one end of a switch S1 and the emergency braking mechanism, the other end of the relay K1 is connected with one end of a resistor R13 and is grounded, the other end of a switch S1 is respectively connected with the anode of a voltage regulator D2 and the base of the triode Q3, the collector of a triode Q3 is connected with one end of a buzzer B1, the other end of the buzzer B1 is connected with the other end of the resistor R12, and the emitter of the triode Q3 is connected with the other end of the resistor R13.
When the ultrasonic signal processing circuit is used specifically, the signal receiving circuit comprises a filter and a subtracter, the filter receives an ultrasonic signal detected by an ultrasonic sensor U1 through a resistor R1, the ultrasonic signal is subjected to impedance matching through an impedance matching circuit consisting of an inductor L1, a capacitor C1 and a capacitor C2, a band-pass filter consisting of an inductor L3, a capacitor C4, an inductor L2 and a capacitor C6 is used for band-pass filtering of the ultrasonic signal, the filtered ultrasonic signal is subjected to follow-up processing through a triode Q1, the capacity of the ultrasonic signal for driving a post-stage circuit is improved, the ultrasonic signal is transmitted to the subtracter and a signal processing circuit, the subtracter performs further filtering processing on the ultrasonic signal through the inductor L4, a varactor D1 and the capacitor C5 to improve the accuracy of the ultrasonic signal, and the resistor R5 transmits the further filtered ultrasonic signal to the subtracter, the voltage value provided by the resistor R3 and the voltage value provided by the variable resistor R7 are subtracted, the voltage value provided by the resistor R3 and the voltage value provided by the variable resistor R7 are equal to the voltage value of the ultrasonic signal transmitted to the band-pass filter consisting of the inductor L3, the capacitor C4, the inductor L2 and the capacitor C6, the difference signal output by the subtracter is the loss caused by the Q value of the resonant cavity of the band-pass filter consisting of the inductor L3, the capacitor C4, the inductor L2 and the capacitor C6 when the ultrasonic signal is filtered, the difference signal is transmitted to the signal processing circuit, the adder receives the difference signal and the ultrasonic signal, the difference signal and the ultrasonic signal are added by the operational amplifier U3B to obtain the alarm signal, accurate compensation after the ultrasonic signal is filtered is realized, the ultrasonic signal is transmitted to the controller at the moment, the alarm signal is transmitted to the ECU at the same time, and the driver is reminded that an obstacle exists at, a shutdown is required, when the alarm signal turns on transistor Q2, indicating that the alarm signal is of a weak amplitude, namely, the obstacle is close to the tail of the special vehicle and is easy to be dangerous, at the moment, the triode Q2 conducts the relay K1, meanwhile, the emergency brake mechanism is opened to realize the emergency brake of the special vehicle and ensure the safety of the special vehicle, the switch S1 is switched from the open state to the closed state, wherein the switch S1 is a pin switch of the relay K1, the triode Q3 is conducted, the buzzer B1 is started to give an alarm to remind a driver of adjusting the reversing direction, when the warning signal conducts the voltage-regulator tube D2, the fact that the distance between the barrier and the tail of the special vehicle is indicated is that the voltage-regulator tube D2 conducts the triode Q3, the triode Q3 starts the buzzer B1 to give an alarm, a driver is reminded of adjusting the reversing direction, and the driving safety of the special vehicle is prevented from being influenced;
the ultrasonic signal is accurately compensated by a subtracter taking an operational amplifier U2B as a core and an adder taking an operational amplifier U3B as a core, the voltage value of the ultrasonic signal is accurately compensated by using an inductor L3, a capacitor C4, an inductor L2 and a capacitor C6 for filtering, and the voltage value of the ultrasonic signal is further filtered by using an inductor L4, a variable capacitance diode D1 and a capacitor C5 for accurately representing the distance between an obstacle and a special vehicle, so that the error is avoided, the loss caused by the influence of the Q value of the filter on the amplitude of the ultrasonic signal is avoided, the obtained ultrasonic signal is pure and free from interference, the problem of low accuracy of the ultrasonic signal is solved, meanwhile, the safety of the special vehicle is ensured by using a voltage stabilizing tube D2, a triode Q3 and a controller taking a triode Q2 as a core, the driver is reminded of adjusting the reversing direction, and the driving safety of the special vehicle is prevented from being influenced.
Claims (7)
1. The reversing safety detection device for the special vehicle is characterized by comprising a signal receiving circuit and a signal processing circuit, wherein the signal receiving circuit enables an ultrasonic signal detected by an ultrasonic sensor U1 in a blind area of the special vehicle to pass through a filter and a subtracter to obtain a difference signal, the signal receiving circuit transmits the difference signal and the ultrasonic signal to the signal processing circuit, the signal processing circuit receives the ultrasonic signal and the difference signal through the summator to obtain an alarm signal, and the alarm signal starts a controller.
2. A reversing safety detecting device for a special vehicle according to claim 1, wherein the signal receiving circuit comprises a filter and a subtracter, the filter filters the ultrasonic signal detected in the blind area of the special vehicle by the ultrasonic sensor U1, the filtered ultrasonic signal obtains a difference signal by the subtracter, and the difference signal and the ultrasonic signal are transmitted to the signal processing circuit.
3. A reversing safety detecting device for special vehicle according to claim 2, wherein the filter comprises a resistor R1, one end of the resistor R1 is connected to an out pin of the ultrasonic sensor U1, the other end of the resistor R1 is connected to one end of a capacitor C1 and one end of an inductor L1, the other end of the inductor L1 is connected to one end of a capacitor C2 and one end of an inductor L3, the other end of the inductor L3 is connected to one end of the capacitor C4, the other end of the capacitor C4 is connected to one end of a capacitor C6, one end of an inductor L2, a base of a transistor Q1 and one end of a resistor R2, a collector of the transistor Q1 is connected to the other end of the resistor R2 and a VCC pin of the ultrasonic sensor U1, an emitter of the transistor Q1 is connected to one end of a resistor R4, the other end of the resistor R4 is connected to the other end of an inductor L2 and the other end of a capacitor C2, The other end of the capacitor C1 is connected in parallel with the gnd pin of the ultrasonic sensor U1 and is connected to ground.
4. A reversing safety detecting device for a special vehicle according to claim 2, the subtractor comprises an inductor L4, one end of the inductor L4 is respectively connected with an emitter of a triode Q1 in the filter and one end of a resistor R4, the other end of the inductor L4 is respectively connected with one end of a capacitor C5, an anode of a varactor D1 and one end of a resistor R5, the other end of the resistor R5 is respectively connected with one end of a resistor R6 and a non-inverting end of an operational amplifier U2B, an inverting end of the operational amplifier U2B is respectively connected with one end of a variable resistor R7 and one end of a resistor R3, the other end of the resistor R3 is respectively connected with the other end of the capacitor C5, a cathode of the varactor D1, the other end of the resistor R6 and the other end of an inductor L2 in the filter and is grounded, the other end of the variable resistor R7 is connected to the collector of the transistor Q1 in the filter and connected to the positive power supply VCC.
5. A reversing safety detecting device for special vehicles according to claim 1, wherein the signal processing circuit comprises an adder and a controller, the adder receives the difference signal and the ultrasonic signal transmitted by the signal receiving circuit, the difference signal and the ultrasonic signal obtain an alarm signal at the adder, and the alarm signal starts the controller.
6. A reversing safety detecting device for a special vehicle according to claim 5, wherein the adder comprises a resistor R10, one end of the resistor R10 is connected with the output end of an operational amplifier U2B in the signal receiving circuit, the other end of the resistor R10 is respectively connected with one end of a resistor R11 and the same-phase end of an operational amplifier U3B, the other end of the resistor R11 is connected with one end of a resistor R5 in the signal receiving circuit, the reverse-phase end of the operational amplifier U3B is respectively connected with one end of a resistor R8 and one end of a resistor R9, and the other end of the resistor R8 is connected with the other end of the resistor R6 in the signal receiving circuit and grounded.
7. A reverse safety detecting device for special vehicle as claimed in claim 5, wherein said controller comprises a voltage regulator D2, the negative pole of voltage regulator D2 is connected to one end of resistor R14, the base of transistor Q2 and ECU respectively, the other end of resistor R9 in the adder and the output end of operational amplifier U3B, the emitter of transistor Q2 is connected to the other end of resistor R14, one end of resistor R12 and the other end of variable resistor R7 in the signal receiving circuit and connected to positive power VCC, the collector of transistor Q2 is connected to one end of relay K1, one end of switch S1 and emergency braking mechanism respectively, the other end of relay K1 is connected to one end of resistor R13 and grounded, the other end of switch S1 is connected to the positive pole of voltage regulator D2 and the base of transistor Q3 respectively, the collector of transistor Q3 is connected to one end of buzzer B1, the other end of buzzer B1 is connected to the other end of resistor R12, the emitter of the transistor Q3 is connected to the other end of the resistor R13.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110346502.XA CN112918380A (en) | 2021-03-31 | 2021-03-31 | Reversing safety detection device for special vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110346502.XA CN112918380A (en) | 2021-03-31 | 2021-03-31 | Reversing safety detection device for special vehicle |
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| CN112918380A true CN112918380A (en) | 2021-06-08 |
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| CN202110346502.XA Withdrawn CN112918380A (en) | 2021-03-31 | 2021-03-31 | Reversing safety detection device for special vehicle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113325854A (en) * | 2021-07-12 | 2021-08-31 | 徐州天辰货架制造有限公司 | AGV dolly keeps away barrier system |
| CN113359583A (en) * | 2021-08-09 | 2021-09-07 | 徐州天辰货架制造有限公司 | Safety protection device for section bar cutting machine |
| CN114783248A (en) * | 2022-03-01 | 2022-07-22 | 中国人民解放军空军工程大学 | Accurate parking positioning method under complex operation environment of special equipment |
-
2021
- 2021-03-31 CN CN202110346502.XA patent/CN112918380A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113325854A (en) * | 2021-07-12 | 2021-08-31 | 徐州天辰货架制造有限公司 | AGV dolly keeps away barrier system |
| CN113359583A (en) * | 2021-08-09 | 2021-09-07 | 徐州天辰货架制造有限公司 | Safety protection device for section bar cutting machine |
| CN114783248A (en) * | 2022-03-01 | 2022-07-22 | 中国人民解放军空军工程大学 | Accurate parking positioning method under complex operation environment of special equipment |
| CN114783248B (en) * | 2022-03-01 | 2023-09-15 | 中国人民解放军空军工程大学 | Accurate parking positioning method under complex operation environment of special equipment |
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Application publication date: 20210608 |