CN110879392B - Host-free radar ranging alarm method, device, circuit and storage medium - Google Patents
Host-free radar ranging alarm method, device, circuit and storage medium Download PDFInfo
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- CN110879392B CN110879392B CN201911210594.8A CN201911210594A CN110879392B CN 110879392 B CN110879392 B CN 110879392B CN 201911210594 A CN201911210594 A CN 201911210594A CN 110879392 B CN110879392 B CN 110879392B
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2013/9317—Driving backwards
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a distance measuring and alarming method, a device, a circuit and a storage medium for a radar without a host, wherein the radar of a target automobile is started when the target automobile is detected to enter a reversing mode; acquiring voltage values of a plurality of radar probes of a radar, and distributing different radar probe IDs according to the voltage values; sending the self-checking result to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking result and feeds back the analysis result; when the analysis result is that the self-checking is qualified, the obstacle distance information fed back by each radar probe is received, and the obstacle distance information is sent to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated or not to give an alarm after comparing the obstacle distance information with a preset alarm distance threshold value, the cost of the radar device can be reduced, the radar control without a host is realized, and the radar device has strong compatibility and early warning accuracy, and effectively protects the driving safety of a driver.
Description
Technical Field
The invention relates to the field of automobile radars, in particular to a distance measurement alarm method, a distance measurement alarm device, a distance measurement alarm circuit and a storage medium for a radar without a host.
Background
Automotive radars include various different radars based on different technologies (e.g., laser, ultrasonic, microwave), have different functions, and employ different operating principles; from the vehicle owner's perspective, automotive radars are convenient and not very expensive as a safety device; the automobile radar system can bear some work needing attention, judgment and technology, so that driving strength is reduced, burden of a driver is reduced, the existing automobile radar system is composed of a radar sensor and a radar controller, and the production cost of the automobile can be increased due to the radar controller, namely an additional host.
Disclosure of Invention
The invention mainly aims to provide a radar ranging alarm method, a radar ranging alarm device, a radar ranging alarm circuit and a storage medium, and aims to solve the problem that in the prior art, a radar controller host can increase the production cost of an automobile.
In order to achieve the above object, the present invention provides a distance measuring and alarming method for radar without a host, which comprises the following steps:
starting a radar of a target automobile when the target automobile is detected to enter a reversing mode;
acquiring voltage values of a plurality of radar probes of the radar, and distributing different radar probe IDs according to the voltage values;
determining a main radar probe according to the ID of each radar probe, receiving self-checking results of other radars according to the main radar probe, and sending the self-checking results to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking results and feeds back the analysis results;
and when the analysis result is that the self-inspection is qualified, receiving obstacle distance information fed back by each radar probe, and sending the obstacle distance information to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated or not to alarm after comparing the obstacle distance information with a preset alarm distance threshold value.
Preferably, the receiving obstacle distance information fed back by each radar probe, and sending the obstacle distance information to the vehicle-mounted instrument includes:
transmitting the acquired peripheral obstacle distance information to the main radar probe by other radar probes except the main radar probe through a preset internal local area interconnection network (LIN);
the main radar probe integrates the main obstacle distance information measured by the main radar probe and the received peripheral obstacle distance information to generate obstacle distance information;
and after converting the obstacle distance information into a Pulse Width Modulation (PWM) code, sending the PWM code to the vehicle-mounted instrument.
In addition, in order to achieve the above object, the present invention further provides a hardware interface circuit based on the distance measurement alarm method for radar without host, which is used for implementing the distance measurement alarm of radar without host, and is characterized in that the hardware interface circuit includes: the radar hardware interface circuit is arranged in a radar of the target automobile, and the instrument hardware interface circuit is arranged in the vehicle-mounted instrument.
Preferably, the radar hardware interface circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a first triode, a fourth resistor, a fifth resistor, a first capacitor and a second capacitor;
the first end of the first resistor receives the driving pulse of the target automobile, the second end of the first resistor is connected with the base electrode of the first triode, the first end of the second resistor is connected with a power supply voltage, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the collector electrode of the first triode, the emitting electrode of the first triode is grounded, the second end of the second resistor is also connected with the vehicle-mounted instrument, the second end of the third resistor is also connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is grounded, the first end of the first capacitor is connected with the vehicle-mounted instrument, the second end of the first capacitor is grounded, the first end of the second capacitor is connected with the second end of the fourth resistor, the first end of the second capacitor is also connected with the detection end of the vehicle-mounted instrument, and the second end of the second capacitor is grounded.
Preferably, when the vehicle-mounted instrument is a 3.5 inch instrument, the instrument hardware interface circuit includes: a sixth resistor, a seventh resistor, an eighth resistor and a third capacitor;
the first end of the sixth resistor is connected with the radar of the target automobile, the second end of the sixth resistor is connected with the first end of the seventh resistor, the second end of the seventh resistor is grounded, the first end of the seventh resistor is also connected with the first end of the grounded third capacitor, the second end of the third capacitor is grounded, the first end of the third capacitor is also connected with the first end of the eighth resistor, and the second end of the eighth resistor is connected with the signal output end of the vehicle-mounted instrument.
Preferably, when the vehicle-mounted instrument is a 7-inch instrument, the instrument hardware interface circuit includes: a fourth capacitor, a ninth resistor, a tenth resistor and a fifth capacitor;
the first end of the fourth capacitor is connected with the radar of the target automobile, the first end of the fourth capacitor is further connected with the first end of the ninth resistor, the second end of the fourth capacitor is grounded, the second end of the ninth resistor is connected with the first end of the tenth resistor, the second end of the tenth resistor is grounded, the first end of the tenth resistor is connected with the first end of the fifth capacitor, the first end of the fifth capacitor is connected with the signal output end of the vehicle-mounted instrument, and the second end of the fifth capacitor is grounded.
Preferably, when the vehicle-mounted instrument is a 10.25 inch instrument, the instrument hardware interface circuit includes: the device comprises an eleventh resistor, a twelfth resistor, a sixth capacitor, a second triode and a thirteenth resistor;
the first end of the eleventh resistor is connected with the radar of the target automobile, the second end of the eleventh resistor is connected with the first end of the twelfth resistor, the second end of the twelfth resistor is grounded, the first end of the twelfth resistor is connected with the first end of the sixth capacitor, the second end of the sixth capacitor is grounded, the first end of the sixth capacitor is further connected with the base electrode of the second triode, the first end of the thirteenth resistor is connected with the power supply voltage, the second end of the thirteenth resistor is connected with the collector electrode of the second triode, the emitter electrode of the second triode is grounded, and the second end of the thirteenth resistor is further connected with the signal output end of the vehicle-mounted instrument.
Preferably, when the vehicle-mounted instrument is a 12.5 inch instrument, the instrument hardware interface circuit includes: a fourteenth resistor, a fifteenth resistor and a seventh capacitor;
the first end of the fourteenth resistor is connected with the radar of the target automobile, the second end of the fourteenth resistor is connected with the first end of the fifteenth resistor, the second end of the fifteenth resistor is grounded, the first end of the fifteenth resistor is also connected with the first end of the seventh capacitor, the second end of the seventh capacitor is grounded, and the first end of the seventh capacitor is also connected with the signal output end of the vehicle-mounted instrument.
In addition, to achieve the above object, the present invention further provides a storage medium having a hostless radar ranging alarm program stored thereon, wherein the hostless radar ranging alarm program, when executed by a processor, implements the steps of the hostless radar ranging alarm method as described above.
In addition, in order to achieve the above object, the present invention further provides a distance measuring and warning device without a host machine, which includes a radar, a vehicle instrument, and the hardware interface circuit.
The distance measurement alarm method of the radar without the host machine provided by the invention starts the radar of the target automobile when detecting that the target automobile enters a reversing mode; acquiring voltage values of a plurality of radar probes of the radar, and distributing different radar probe IDs according to the voltage values; determining a main radar probe according to the ID of each radar probe, receiving self-checking results of other radars according to the main radar probe, and sending the self-checking results to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking results and feeds back the analysis results; when the analysis result is that the self-checking is qualified, obstacle distance information fed back by each radar probe is received, and the obstacle distance information is sent to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated for alarming or not after comparing the obstacle distance information with a preset alarm distance threshold value, the cost of the radar device can be reduced, the radar control without a host is realized, and the radar device has strong compatibility and early warning accuracy, and effectively protects the driving safety of a driver.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of a radar ranging alarm method without a host according to the present invention;
FIG. 2 is a schematic circuit diagram of a hardware interface circuit according to the present invention;
FIG. 3 is a schematic diagram of a radar hardware interface circuit according to the present invention;
FIG. 4 is a schematic diagram of a 3.5 inch meter hardware interface circuit structure of the hardware interface circuit of the present invention;
FIG. 5 is a schematic diagram of a 7-inch meter hardware interface circuit structure of the hardware interface circuit of the present invention;
FIG. 6 is a schematic diagram of a 10.25 inch meter hardware interface circuit configuration of the hardware interface circuit of the present invention;
FIG. 7 is a schematic diagram of a 12.5 inch meter hardware interface circuit structure of the hardware interface circuit of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The solution of the embodiment of the invention is mainly as follows: according to the invention, when a target automobile is detected to enter a reversing mode, a radar of the target automobile is started; acquiring voltage values of a plurality of radar probes of the radar, and distributing different radar probe IDs according to the voltage values; determining a main radar probe according to the ID of each radar probe, receiving self-checking results of other radars according to the main radar probe, and sending the self-checking results to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking results and feeds back the analysis results; when the analysis result is that the self-checking is qualified, obstacle distance information fed back by each radar probe is received, and the obstacle distance information is sent to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated for alarming or not after comparing the obstacle distance information with a preset alarm distance threshold value according to the obstacle distance information, the cost of the radar device can be reduced, the radar control without a host is realized, the compatibility and the early warning accuracy are high, the driving safety of a driver is effectively protected, and the technical problem that the host of a radar controller can increase the production cost of an automobile in the prior art is solved.
Referring to fig. 1, fig. 1 is a schematic flow chart of a radar ranging alarm method without a host according to a first embodiment of the present invention.
In a first embodiment, the hostless radar ranging alarm method includes the steps of:
and step S10, when the target automobile is detected to enter the reversing mode, starting the radar of the target automobile.
It should be noted that when the target vehicle enters a reverse mode, that is, when the target vehicle is backing up, the radar of the target vehicle is turned on.
And step S20, acquiring voltage values of a plurality of radar probes of the radar, and distributing different radar probe IDs according to the voltage values.
It is understood that by acquiring voltage values of a plurality of radar probes of the radar, different ID voltage values can be assigned according to the voltage values of the radar probes, and different IDs can be assigned according to the ID voltage values of the radar probes by the system.
And S30, determining a main radar probe according to the ID of each radar probe, receiving self-checking results of other radars according to the main radar probe, and sending the self-checking results to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking results and feeds back the analysis results.
It should be understood that a main radar probe can be determined according to the ID of each radar probe, and further, the self-test result of other radars can be received by the radar probe, and the self-test result is sent to the vehicle-mounted instrument, so that the vehicle-mounted instrument analyzes the self-test result, and feeds back the analysis result, that is, the radar system is powered by the reverse gear switch, and when entering the R gear, the radar system is powered on, and then an ID address is assigned: after the system is started, different IDs are allocated to the system according to different voltage values of the IDs of the radar probes, the system can perform self-checking after ID addresses are allocated, and a self-checking result is sent to the instrument by the main probe.
And step S40, when the analysis result is that the self-inspection is qualified, receiving obstacle distance information fed back by each radar probe, and sending the obstacle distance information to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated or not to give an alarm after comparing the obstacle distance information with a preset alarm distance threshold value.
It can be understood that when the analysis result is that the self-inspection is qualified, the obstacle distance information fed back by each radar probe is received, and then the obstacle distance information is compared with a preset alarm distance threshold value to determine whether to alarm or not.
Further, the step S40 includes the following steps:
transmitting the acquired peripheral obstacle distance information to the main radar probe by other radar probes except the main radar probe through a preset internal local area interconnection network (LIN);
the main radar probe integrates the main obstacle distance information measured by the main radar probe and the received peripheral obstacle distance information to generate obstacle distance information;
and after converting the obstacle distance information into a Pulse Width Modulation (PWM) code, sending the PWM code to the vehicle-mounted instrument.
In the specific implementation, after self-checking, the system starts to measure distance, the master probe controls other slave probes to work, receives obstacle distance information fed back by the slave probes, performs comprehensive processing, and sends the information to the instrument (the slave probes send data to the master probe through Local Interconnect Network (LIN)), the master probe sends the distance measurement information of each probe to the instrument in a Pulse Width Modulation (PWM) mode, the master probe sends the obstacle distance information to the instrument for alarming, and then quits the R-gear system to be closed.
It will be appreciated that in actual operation, the following strategies may be implemented by the off-host radar software: when the radar system identifies the main probe (450ms), the ID line is actively pulled down, and then the alarm mode is kept the same as the original host mode, and high-level alarm is carried out. This therefore involves the meter determining when the initial high level is active. Simultaneously, the meter needs to meet the requirements put forward by customers: the instrument which needs to be changed can be compatible with the original master radar scheme, the radar system and the instrument need to be modified as follows, for the radar system without the master, in order to meet the high-level alarm strategy, the radar system is electrified to judge that the time sequence identified by the ID is about 450ms, and after 450ms, the high level sent by the ID is pulled down through software, so that the high-level alarm strategy is realized; for an instrument system, in order to be compatible with a host radar alarm strategy and a host-free radar alarm strategy, the following 2-point requirements need to be added to the original strategy of software in the instrument: the R range signal is identified and after the identification of the R range signal, the signal (PWM) emitted by the radar system is processed with a delay of 500 ms.
According to the scheme, when the target automobile is detected to enter the reversing mode, the radar of the target automobile is started; acquiring voltage values of a plurality of radar probes of the radar, and distributing different radar probe IDs according to the voltage values; determining a main radar probe according to the ID of each radar probe, receiving self-checking results of other radars according to the main radar probe, and sending the self-checking results to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking results and feeds back the analysis results; when the analysis result is that the self-checking is qualified, obstacle distance information fed back by each radar probe is received, and the obstacle distance information is sent to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated for alarming or not after comparing the obstacle distance information with a preset alarm distance threshold value, the cost of the radar device can be reduced, the radar control without a host is realized, and the radar device has strong compatibility and early warning accuracy, and effectively protects the driving safety of a driver.
Further, fig. 2 is a hardware interface circuit based on the radar ranging alarm method without a host, and fig. 2 is a schematic circuit structure diagram of the hardware interface circuit.
The hardware interface circuit Z0 includes: the radar hardware interface circuit Z1 and the instrument hardware interface circuit Z2, the radar hardware interface circuit Z1 is arranged in the radar of the target automobile, and the instrument hardware interface circuit Z2 is arranged in the vehicle-mounted instrument.
Further, based on the hardware interface circuit of fig. 2, a radar hardware interface circuit of the present invention is proposed, and fig. 3 is a schematic structural diagram of the radar hardware interface circuit of the present invention.
The radar hardware interface circuit includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first triode Q1, a fourth resistor R4, a fifth resistor R5, a first capacitor C1 and a second capacitor C2;
a first end of the first resistor R1 receives the driving pulse MC of the target vehicle, a second end of the first resistor R1 is connected to a base of the first triode Q1, a first end of the second resistor R2 is connected to a supply voltage VCC, a second end of the second resistor R2 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to a collector of the first triode Q1, an emitter of the first triode Q1 is grounded, a second end of the second resistor R2 is further connected to the vehicle-mounted instrument YB, a second end of the third resistor R3 is further connected to a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to a first end of the fifth resistor R5, a second end of the fifth resistor R5 is grounded, a first end of the first capacitor C1 is connected to the vehicle-mounted instrument YB, and a second end of the first capacitor C1 is grounded, a first end of the second capacitor C1 is connected to a second end of the fourth resistor R4, a first end of the second capacitor C2 is further connected to a detection end YB1 of the vehicle-mounted instrument YB, and a second end of the second capacitor C2 is grounded.
Further, based on the hardware interface circuit of fig. 2, a 3.5 inch instrument hardware interface circuit of the present invention is proposed, and fig. 4 is a schematic structural diagram of the 3.5 inch instrument hardware interface circuit of the present invention.
When on-vehicle instrument is 3.5 cun instruments, instrument hardware interface circuit includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a third capacitor C3;
a first end of the sixth resistor R6 is connected to a radar of the target vehicle, that is, connected to the radar hardware interface circuit Z1, a second end of the sixth resistor R6 is connected to a first end of the seventh resistor R7, a second end of the seventh resistor R7 is grounded, a first end of the seventh resistor R7 is further connected to a first end of a ground third capacitor C3, a second end of the third capacitor C3 is grounded, a first end of the third capacitor C3 is further connected to a first end of the eighth resistor R8, and a second end of the eighth resistor R8 is connected to the signal output terminal YB2 of the vehicle-mounted instrument YB.
Further, based on the hardware interface circuit of fig. 2, a 7-inch instrument hardware interface circuit of the present invention is proposed, and fig. 5 is a schematic structural diagram of the 7-inch instrument hardware interface circuit of the present invention.
When on-vehicle instrument is 7 cun instruments, instrument hardware interface circuit includes: a fourth capacitor C4, a ninth resistor R9, a tenth resistor R10 and a fifth capacitor C5;
the first end of the fourth capacitor C4 is connected to the radar of the target vehicle, that is, the radar hardware interface circuit Z1, the first end of the fourth capacitor C4 is further connected to the first end of the ninth resistor R9, the second end of the fourth capacitor C4 is grounded, the second end of the ninth resistor R9 is connected to the first end of the tenth resistor R10, the second end of the tenth resistor R10 is grounded, the first end of the tenth resistor R10 is connected to the first end of the fifth capacitor C5, the first end of the fifth capacitor C5 is connected to the signal output end YB2 of the vehicle-mounted instrument YB, and the second end of the fifth capacitor C5 is grounded.
Further, based on the hardware interface circuit of fig. 2, a 10.25 inch instrument hardware interface circuit of the present invention is proposed, and fig. 6 is a schematic structural diagram of the 10.25 inch instrument hardware interface circuit of the present invention.
When on-vehicle instrument is 10.25 cun instruments, instrument hardware interface circuit includes: an eleventh resistor R11, a twelfth resistor R12, a sixth capacitor C6, a second triode Q2 and a thirteenth resistor R13;
a first end of the eleventh resistor R11 is connected to the radar of the target vehicle, that is, connected to the radar hardware interface circuit Z1, a second end of the eleventh resistor R11 is connected to a first end of the twelfth resistor R12, a second end of the twelfth resistor R12 is grounded, a first end of the twelfth resistor R12 is connected to a first end of the sixth capacitor C6, a second end of the sixth capacitor C6 is grounded, a first end of the sixth capacitor C6 is further connected to a base of the second triode Q2, a first end of the thirteenth resistor R13 is connected to the supply voltage ACC, a second end of the thirteenth resistor R13 is connected to a collector of the second triode Q2, an emitter of the second triode Q2 is grounded, and a second end of the thirteenth resistor R13 is further connected to the signal output terminal YB2 of the vehicle-mounted instrument YB.
Further, based on the hardware interface circuit of fig. 2, a 12.5 inch instrument hardware interface circuit of the present invention is proposed, and fig. 7 is a schematic structural diagram of the 12.5 inch instrument hardware interface circuit of the present invention.
When on-vehicle instrument is 12.5 cun instruments, instrument hardware interface circuit includes: a fourteenth resistor R14, a fifteenth resistor R15 and a seventh capacitor C7;
a first end of the fourteenth resistor R14 is connected to the radar of the target vehicle, that is, connected to the radar hardware interface circuit Z1, a second end of the fourteenth resistor R14 is connected to a first end of the fifteenth resistor R15, a second end of the fifteenth resistor R15 is grounded, a first end of the fifteenth resistor R15 is further connected to a first end of the seventh capacitor C7, a second end of the seventh capacitor C7 is grounded, and a first end of the seventh capacitor C7 is further connected to a signal output end YB2 of the vehicle-mounted instrument YB.
The invention also provides a distance measurement and alarm device for the radar without the host, which comprises the radar, the vehicle-mounted instrument and the hardware interface circuit.
In addition, an embodiment of the present invention further provides a storage medium, where the storage medium stores a host-less radar ranging alarm program, and when executed by a processor, the host-less radar ranging alarm program implements the following operations:
starting a radar of a target automobile when the target automobile is detected to enter a reversing mode;
acquiring voltage values of a plurality of radar probes of the radar, and distributing different radar probe IDs according to the voltage values;
determining a main radar probe according to the ID of each radar probe, receiving self-checking results of other radars according to the main radar probe, and sending the self-checking results to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking results and feeds back the analysis results;
and when the analysis result is that the self-inspection is qualified, receiving obstacle distance information fed back by each radar probe, and sending the obstacle distance information to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated or not to alarm after comparing the obstacle distance information with a preset alarm distance threshold value.
Further, when executed by the processor, the hostless radar ranging alarm program further performs the following operations:
transmitting the acquired peripheral obstacle distance information to the main radar probe by other radar probes except the main radar probe through a preset internal local area interconnection network (LIN);
the main radar probe integrates the main obstacle distance information measured by the main radar probe and the received peripheral obstacle distance information to generate obstacle distance information;
and after converting the obstacle distance information into a Pulse Width Modulation (PWM) code, sending the PWM code to the vehicle-mounted instrument.
According to the scheme, when the target automobile is detected to enter the reversing mode, the radar of the target automobile is started; acquiring voltage values of a plurality of radar probes of the radar, and distributing different radar probe IDs according to the voltage values; determining a main radar probe according to the ID of each radar probe, receiving self-checking results of other radars according to the main radar probe, and sending the self-checking results to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking results and feeds back the analysis results; when the analysis result is that the self-checking is qualified, obstacle distance information fed back by each radar probe is received, and the obstacle distance information is sent to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated for alarming or not after comparing the obstacle distance information with a preset alarm distance threshold value, the cost of the radar device can be reduced, the radar control without a host is realized, and the radar device has strong compatibility and early warning accuracy, and effectively protects the driving safety of a driver.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or other apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or other apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or article that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A distance measurement and alarm method for a radar without a host is characterized by comprising the following steps:
starting a radar of a target automobile when the target automobile is detected to enter a reversing mode;
acquiring voltage values of a plurality of radar probes of the radar, and distributing different radar probe IDs according to the voltage values;
determining a main radar probe according to the ID of each radar probe, receiving self-checking results of other radars according to the main radar probe, and sending the self-checking results to a vehicle-mounted instrument so that the vehicle-mounted instrument analyzes the self-checking results and feeds back the analysis results;
when the analysis result is that the self-inspection is qualified, obstacle distance information fed back by each radar probe is received, and the obstacle distance information is sent to the vehicle-mounted instrument, so that the vehicle-mounted instrument judges whether alarm information is generated or not to alarm after comparing the obstacle distance information with a preset alarm distance threshold value;
the sending the obstacle distance information to the vehicle instrument includes:
after the obstacle distance information is converted into a Pulse Width Modulation (PWM) code, the PWM code is sent to the vehicle-mounted instrument;
the radar ranging alarm method without the host further comprises a hardware interface circuit;
the hardware interface circuit includes: the radar hardware interface circuit is arranged in a radar of a target automobile, the instrument hardware interface circuit is arranged in the vehicle-mounted instrument, the vehicle-mounted instrument is additionally provided with an R gear signal identification strategy on the basis of an original strategy, and the PWM codes sent by a radar system are processed by delaying for 500ms after the R gear signal identification, so that an alarm strategy compatible with a host radar and a non-host radar is realized.
2. The radar ranging alarm method without the host computer according to claim 1, wherein the receiving obstacle distance information fed back by each radar probe and sending the obstacle distance information to the vehicle-mounted instrument comprises:
transmitting the acquired peripheral obstacle distance information to the main radar probe by other radar probes except the main radar probe through a preset internal local area interconnection network (LIN);
the main radar probe integrates the main obstacle distance information measured by the main radar probe and the received peripheral obstacle distance information to generate obstacle distance information;
and after converting the obstacle distance information into a Pulse Width Modulation (PWM) code, sending the PWM code to the vehicle-mounted instrument.
3. The host-less radar ranging alarm method of claim 1, wherein the radar hardware interface circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a first triode, a fourth resistor, a fifth resistor, a first capacitor and a second capacitor;
the first end of the first resistor receives the driving pulse of the target automobile, the second end of the first resistor is connected with the base electrode of the first triode, the first end of the second resistor is connected with a power supply voltage, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the collector electrode of the first triode, the emitting electrode of the first triode is grounded, the second end of the second resistor is also connected with the vehicle-mounted instrument, the second end of the third resistor is also connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is grounded, the first end of the first capacitor is connected with the vehicle-mounted instrument, the second end of the first capacitor is grounded, the first end of the second capacitor is connected with the second end of the fourth resistor, the first end of the second capacitor is also connected with the detection end of the vehicle-mounted instrument, and the second end of the second capacitor is grounded.
4. The host-free radar ranging alarm method of claim 1, wherein when the vehicle-mounted meter is a 3.5 inch meter, the meter hardware interface circuit comprises: a sixth resistor, a seventh resistor, an eighth resistor and a third capacitor;
the first end of the sixth resistor is connected with the radar of the target automobile, the second end of the sixth resistor is connected with the first end of the seventh resistor, the second end of the seventh resistor is grounded, the first end of the seventh resistor is also connected with the first end of the third capacitor, the second end of the third capacitor is grounded, the first end of the third capacitor is also connected with the first end of the eighth resistor, and the second end of the eighth resistor is connected with the signal output end of the vehicle-mounted instrument.
5. The host-free radar ranging alarm method of claim 1, wherein when the vehicle-mounted meter is a 7-inch meter, the meter hardware interface circuit comprises: a fourth capacitor, a ninth resistor, a tenth resistor and a fifth capacitor;
the first end of the fourth capacitor is connected with the radar of the target automobile, the first end of the fourth capacitor is further connected with the first end of the ninth resistor, the second end of the fourth capacitor is grounded, the second end of the ninth resistor is connected with the first end of the tenth resistor, the second end of the tenth resistor is grounded, the first end of the tenth resistor is connected with the first end of the fifth capacitor, the first end of the fifth capacitor is connected with the signal output end of the vehicle-mounted instrument, and the second end of the fifth capacitor is grounded.
6. The host-free radar ranging alarm method of claim 1, wherein when the vehicle-mounted meter is a 10.25 inch meter, the meter hardware interface circuit comprises: the device comprises an eleventh resistor, a twelfth resistor, a sixth capacitor, a second triode and a thirteenth resistor;
the first end of the eleventh resistor is connected with the radar of the target automobile, the second end of the eleventh resistor is connected with the first end of the twelfth resistor, the second end of the twelfth resistor is grounded, the first end of the twelfth resistor is connected with the first end of the sixth capacitor, the second end of the sixth capacitor is grounded, the first end of the sixth capacitor is further connected with the base electrode of the second triode, the first end of the thirteenth resistor is connected with the power supply voltage, the second end of the thirteenth resistor is connected with the collector electrode of the second triode, the emitter electrode of the second triode is grounded, and the second end of the thirteenth resistor is further connected with the signal output end of the vehicle-mounted instrument.
7. The host-free radar ranging alarm method of claim 1, wherein when the vehicle-mounted meter is a 12.5 inch meter, the meter hardware interface circuit comprises: a fourteenth resistor, a fifteenth resistor and a seventh capacitor;
the first end of the fourteenth resistor is connected with the radar of the target automobile, the second end of the fourteenth resistor is connected with the first end of the fifteenth resistor, the second end of the fifteenth resistor is grounded, the first end of the fifteenth resistor is also connected with the first end of the seventh capacitor, the second end of the seventh capacitor is grounded, and the first end of the seventh capacitor is also connected with the signal output end of the vehicle-mounted instrument.
8. A distance measuring and alarming device of a radar without a host machine is characterized by comprising a radar, a vehicle-mounted instrument and a hardware interface circuit of the distance measuring and alarming method of the radar without the host machine according to any one of claims 1 and 3-6.
9. A storage medium having stored thereon a hostless radar ranging alarm program which when executed by a processor implements the steps of the hostless radar ranging alarm method of any one of claims 1-2.
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