CN107124239B - Vehicle-mounted central frequency control point interference source detection method - Google Patents
Vehicle-mounted central frequency control point interference source detection method Download PDFInfo
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- CN107124239B CN107124239B CN201710266049.5A CN201710266049A CN107124239B CN 107124239 B CN107124239 B CN 107124239B CN 201710266049 A CN201710266049 A CN 201710266049A CN 107124239 B CN107124239 B CN 107124239B
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Abstract
The invention discloses a method for detecting a vehicle-mounted central control frequency point interference source, which comprises the following steps: placing equipment to be tested in a shielding room, and receiving a power supply of a vehicle machine system, wherein the vehicle machine system comprises a main controller, a radio module, a storage peripheral, modules 1-N-1, program-controlled power supplies 1-N and a system memory; the car machine system carries out radio frequency point interference searching and scanning to obtain full frequency point pre-scanning data before the car machine system closes the programmable power supply by 1-N and full frequency point scanning data of each time after the car machine system sequentially closes the programmable power supply by 1-N; and the vehicle-mounted machine system compares and analyzes the full-frequency-point pre-scanning data with the full-frequency-point pre-scanning data of each time so as to locate the interference source. The invention can automatically obtain the influence of each module on the frequency point test, thereby quickly and accurately finding an interference source without frequently taking out and disassembling the module from a shielding environment in the radio performance test process, having simpler and faster operation, lower requirement on the test environment, difficult damage to a car machine and wide application in the test field.
Description
Technical Field
The invention relates to the field of testing, in particular to a method for detecting an interference source of a vehicle-mounted central frequency control point.
Background
As is known, the vehicle-mounted market is different from the general consumer market, and the requirements of vehicle-mounted products on the reliability and durability of each device are generally strict, so the technical development level of the vehicle-mounted market at the present stage is far behind that of the general consumer electronic products, especially in the field of front-loading vehicle-mounted products. With the rise of intelligent equipment, the public experience requirements on vehicle-mounted products are continuously improved, and the attention of each party is focused on the vehicle-mounted market.
The current front-loading vehicle-mounted central control (i.e. vehicle-mounted system) generally adopts a super heterodyne radio, and engineers need to frequently enter and exit a shielding room to test various performance indexes of the front-loading vehicle-mounted central control in the research and development stage. Particularly for the detection of an interference source, the frequency point of a radio is low, a plurality of DC-DC power supplies exist in a car machine, and a plurality of integrated modules are adopted in the car machine, so that the broadband noise is difficult to identify by using a near-field probe. In contrast, the existing solution is that a hardware engineer first obtains a full frequency point signal-to-noise ratio test result according to an audio analyzer test, then takes out a car machine, welds or detaches corresponding devices according to experience and the full frequency point signal-to-noise ratio test result, then assembles and places the devices into a shielding room for testing, and repeatedly operates the steps to lock a final interference source. The radio performance testing mode of frequently taking out and disassembling the radio from the shielding environment is complex to operate, consumes long time, has high requirements on the testing environment, is easy to damage a car machine in the frequent disassembling mode, and needs to be further improved.
Disclosure of Invention
To solve the above technical problems, the present invention aims to: the method for detecting the interference source of the vehicle-mounted central frequency control point is easy and quick to operate, low in requirement on test environment and not prone to damage of a vehicle machine.
The technical scheme adopted by the invention is as follows:
a method for detecting an interference source of a vehicle-mounted central control frequency point comprises the following steps:
placing equipment to be tested in a shielding room, and connecting a power supply of a vehicle machine system, wherein the vehicle machine system comprises a main controller, a radio module, a storage peripheral, modules 1-N-1, program-controlled power supplies 1-N and a system memory, N is the total number of the program-controlled power supplies, the modules 1-N-1 are respectively connected with the program-controlled power supplies 1-N-1 in a one-to-one correspondence manner, and the program-controlled power supplies N are connected with the system memory;
the car machine system carries out radio frequency point interference searching and scanning to obtain full frequency point pre-scanning data before the car machine system closes the programmable power supply by 1-N and full frequency point scanning data of each time after the car machine system sequentially closes the programmable power supply by 1-N;
and the vehicle-mounted machine system compares and analyzes the full-frequency-point pre-scanning data with the full-frequency-point pre-scanning data of each time so as to locate the interference source.
Further, the car machine system carries out radio frequency point interference searching scanning, obtains the full frequency point pre-scanning data before car machine system closes programmable power supply 1~ N and the car machine system closes this step of full frequency point scanning data of each time after programmable power supply 1~ N in order, and it includes:
the vehicle-mounted machine system selects one mode from three preset modes of an FM mode, an AM mode and an FM + AM mode as a radio frequency point interference searching mode;
and the vehicle machine system carries out searching and scanning on the radio frequency point interference in the corresponding mode according to the selected mode to obtain full frequency point pre-scanning data before the vehicle machine system closes the programmable power supply 1-N and full frequency point scanning data after the vehicle machine system closes the programmable power supply 1-N in sequence.
Further, the car machine system carries out radio frequency point interference searching scanning of corresponding modes according to the selected mode, and a step of obtaining full frequency point pre-scanning data before the car machine system closes the programmable power supply 1-N and full frequency point scanning data of each time after the car machine system closes the programmable power supply 1-N in sequence comprises the following steps:
s11, the car machine system automatically carries out FM full frequency point pre-scanning through the radio module according to the selected FM mode, and caches the measured FM full frequency point pre-scanning data into a system memory;
s12, initializing, and taking the programmable power supply 1 as the current power supply;
s13, the car machine system scans FM full frequency points under the current situation through the radio module and caches FM full frequency point scanning data under the current situation into a system memory, wherein the current situation is the situation that the current power supply is closed and the program-controlled power supplies of other non-current power supplies are opened;
and S14, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the current power supply and returning to the step S13.
Further, the car machine system carries out radio frequency point interference searching scanning of corresponding modes according to the selected mode, and a step of obtaining full frequency point pre-scanning data before the car machine system closes the programmable power supply 1-N and full frequency point scanning data of each time after the car machine system closes the programmable power supply 1-N in sequence comprises the following steps:
s21, the car machine system automatically carries out AM full frequency point pre-scanning through the radio module according to the selected AM mode, and caches the measured AM full frequency point pre-scanning data into a system memory;
s22, initializing, and taking the programmable power supply 1 as the current power supply;
s23, the car machine system scans the AM full frequency point under the current situation through the radio module and caches the AM full frequency point scanning data under the current situation into a system memory, wherein the current situation is the situation that the current power supply is closed and the program-controlled power supplies of other non-current power supplies are opened;
and S24, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the current power supply and returning to the step S23.
Further, the car machine system carries out radio frequency point interference searching scanning of corresponding modes according to the selected mode, and a step of obtaining full frequency point pre-scanning data before the car machine system closes the programmable power supply 1-N and full frequency point scanning data of each time after the car machine system closes the programmable power supply 1-N in sequence comprises the following steps:
s31, the car machine system automatically carries out FM full frequency point pre-scanning through the radio module according to the selected FM + AM mode, and caches the measured FM full frequency point pre-scanning data into a system memory;
s32, initializing an FM mode, and taking the programmable power supply 1 as the current power supply of the FM mode;
s33, the vehicle-mounted system scans the FM full frequency points under the current condition of the FM mode through the radio module and caches the FM full frequency point scanning data under the current condition of the FM mode into a system memory, wherein the current condition of the FM mode is the condition that the current power supply of the FM mode is closed and the program-controlled power supplies of other current power supplies which are not the FM mode are opened;
s34, judging whether the current power supply in the FM mode is the program control power supply N, if so, executing the step S35, otherwise, taking the next program control power supply as the current power supply in the FM mode and returning to the step S33;
s35, the car machine system automatically carries out AM full frequency point pre-scanning through the radio module, and caches the measured AM full frequency point pre-scanning data into a system memory;
s36, carrying out AM mode initialization, and taking the programmable power supply 1 as the current AM mode power supply;
s37, the car machine system scans the AM full frequency point under the current situation of the AM mode through the radio module and caches the AM full frequency point pre-scanning data under the current situation of the AM mode into a system memory, wherein the current situation of the AM mode is the situation that the current power supply of the AM mode is closed and the program-controlled power supplies of other current power supplies which are not in the AM mode are opened;
and S38, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the AM mode current power supply and returning to the step S37.
Further, the car machine system compares and analyzes the full frequency point pre-scanning data with the full frequency point pre-scanning data of each time to locate the interference source, and the method comprises the following steps:
the vehicle-mounted machine system respectively calculates the interference value change condition of the interference frequency point after each program-controlled power supply is turned off according to the full-frequency-point pre-scanning data and the full-frequency-point pre-scanning data of each time;
and the vehicle machine system determines the interference source of the interference frequency point according to the change condition of the interference value of the interference frequency point after each programmable power supply is turned off.
Further, the vehicle machine system determines an interference source of the interference frequency point according to the interference value change condition of the interference frequency point after each program-controlled power supply is turned off, and the method comprises the following steps:
s41, judging whether the interference values of all interference frequency points are unchanged after any one of the program-controlled power supplies 1-N is turned off, and if yes, judging that the main controller is the only interference source; otherwise, go to step S42;
s42, judging whether the interference value of the partial interference frequency point is unchanged after the current program-controlled power supply is turned off, and if so, judging that the module corresponding to the current program-controlled power supply is not an interference source; otherwise, judging that the module corresponding to the current program-controlled power supply is one of the interference sources of the partial interference frequency point, and executing the step S43 after recording the interference value reduction value of the partial interference frequency point after the current program-controlled power supply is turned off; the current programmable power supply is any one of the programmable power supplies 1-N, the module corresponding to the current programmable power supply is the module corresponding to the current programmable power supply in the modules 1-N, and the partial interference frequency points are one or more of all the interference frequency points;
s43, judging whether the sum of the interference value reduction values of all interference sources of partial interference frequency points in the modules 1-N reaches a set threshold value, if so, judging that the main controller is not one of the interference sources of the partial interference frequency points, otherwise, judging that the main controller is also one of the interference sources of the partial interference frequency points.
Further, a step S44 is further provided after the step S43, where the step S44 specifically is: and storing each interference frequency point and all interference sources corresponding to each interference frequency point in a report form.
Further, the method also comprises the step of displaying the detection result of the interference source on a vehicle-mounted central control screen.
Further, the method also comprises the step of storing the detection result of the interference source in a storage peripheral.
The invention has the beneficial effects that: comprises the steps of placing the device to be tested in a shielding chamber and connecting with a power supply of a vehicle machine system, the vehicle machine system carries out radio frequency point interference searching and scanning, the vehicle machine system carries out comparison and analysis on full frequency point pre-scanning data and all frequency point pre-scanning data, the whole radio frequency band of the vehicle machine system is pre-scanned to obtain the full frequency point pre-scanning data, then the programmable power supply of each module is turned off in sequence, the whole radio frequency band of the vehicle-mounted system is scanned in sequence to obtain all frequency point scanning data of each time, finally the vehicle-mounted system compares and analyzes the all frequency point pre-scanning data with all frequency point scanning data of each time to automatically obtain the influence of each module on the frequency point test, therefore, in the radio performance test process, the interference source can be found quickly and accurately without frequently taking out the radio from the shielding environment for disassembly, the operation is simpler and easier, the radio performance test method is quicker, the requirement on the test environment is lower, and the car machine is not easy to damage.
Drawings
FIG. 1 is a general flowchart of a method for detecting an interference source of a vehicle-mounted central control frequency point according to the present invention;
FIG. 2 is a block diagram of the vehicle-mounted device system according to the present invention;
FIG. 3 is a specific flowchart of three in-vehicle radio frequency point interference search modes according to the present invention.
Detailed Description
Referring to fig. 1 and 2, a method for detecting an interference source at a vehicle-mounted central control frequency point includes the following steps:
placing equipment to be tested in a shielding room, and connecting a power supply of a vehicle machine system, wherein the vehicle machine system comprises a main controller, a radio module, a storage peripheral, modules 1-N-1, program-controlled power supplies 1-N and a system memory, N is the total number of the program-controlled power supplies, the modules 1-N-1 are respectively connected with the program-controlled power supplies 1-N-1 in a one-to-one correspondence manner, and the program-controlled power supplies N are connected with the system memory;
the car machine system carries out radio frequency point interference searching and scanning to obtain full frequency point pre-scanning data before the car machine system closes the programmable power supply by 1-N and full frequency point scanning data of each time after the car machine system sequentially closes the programmable power supply by 1-N;
and the vehicle-mounted machine system compares and analyzes the full-frequency-point pre-scanning data with the full-frequency-point pre-scanning data of each time so as to locate the interference source.
The modules 1 to N-1 are respectively connected with the programmable power supplies 1 to N-1 in a one-to-one correspondence mode, namely the module 1 is connected with the programmable power supply 1, the module 2 is connected with the programmable power supply 2, … …, and the module N-1 is connected with the programmable power supply N-1.
Referring to fig. 3, as a preferred embodiment, the step of the car machine system performing radio frequency point interference searching and scanning to obtain full frequency point pre-scanning data before the car machine system turns off the programmable power supply 1 to N and full frequency point scanning data each time after the car machine system turns off the programmable power supply 1 to N in sequence includes:
the vehicle-mounted machine system selects one mode from three preset modes of an FM mode, an AM mode and an FM + AM mode as a radio frequency point interference searching mode;
and the vehicle machine system carries out searching and scanning on the radio frequency point interference in the corresponding mode according to the selected mode to obtain full frequency point pre-scanning data before the vehicle machine system closes the programmable power supply 1-N and full frequency point scanning data after the vehicle machine system closes the programmable power supply 1-N in sequence.
Referring to fig. 3, as a preferred embodiment, the step of the car machine system performing radio frequency point interference search scanning in a corresponding mode according to a selected mode to obtain full frequency point pre-scanning data before the car machine system turns off the programmable power supply 1 to N and full frequency point scanning data each time after the car machine system turns off the programmable power supply 1 to N in sequence includes:
s11, the car machine system automatically carries out FM full frequency point pre-scanning through the radio module according to the selected FM mode, and caches the measured FM full frequency point pre-scanning data into a system memory;
s12, initializing, and taking the programmable power supply 1 as the current power supply;
s13, the car machine system scans FM full frequency points under the current situation through the radio module and caches FM full frequency point scanning data under the current situation into a system memory, wherein the current situation is the situation that the current power supply is closed and the program-controlled power supplies of other non-current power supplies are opened;
and S14, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the current power supply and returning to the step S13.
Referring to fig. 3, as a preferred embodiment, the step of the car machine system performing radio frequency point interference search scanning in a corresponding mode according to a selected mode to obtain full frequency point pre-scanning data before the car machine system turns off the programmable power supply 1 to N and full frequency point scanning data each time after the car machine system turns off the programmable power supply 1 to N in sequence includes:
s21, the car machine system automatically carries out AM full frequency point pre-scanning through the radio module according to the selected AM mode, and caches the measured AM full frequency point pre-scanning data into a system memory;
s22, initializing, and taking the programmable power supply 1 as the current power supply;
s23, the car machine system scans the AM full frequency point under the current situation through the radio module and caches the AM full frequency point scanning data under the current situation into a system memory, wherein the current situation is the situation that the current power supply is closed and the program-controlled power supplies of other non-current power supplies are opened;
and S24, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the current power supply and returning to the step S23.
Referring to fig. 3, as a preferred embodiment, the step of the car machine system performing radio frequency point interference search scanning in a corresponding mode according to a selected mode to obtain full frequency point pre-scanning data before the car machine system turns off the programmable power supply 1 to N and full frequency point scanning data each time after the car machine system turns off the programmable power supply 1 to N in sequence includes:
s31, the car machine system automatically carries out FM full frequency point pre-scanning through the radio module according to the selected FM + AM mode, and caches the measured FM full frequency point pre-scanning data into a system memory;
s32, initializing an FM mode, and taking the programmable power supply 1 as the current power supply of the FM mode;
s33, the vehicle-mounted system scans the FM full frequency points under the current condition of the FM mode through the radio module and caches the FM full frequency point scanning data under the current condition of the FM mode into a system memory, wherein the current condition of the FM mode is the condition that the current power supply of the FM mode is closed and the program-controlled power supplies of other current power supplies which are not the FM mode are opened;
s34, judging whether the current power supply in the FM mode is the program control power supply N, if so, executing the step S35, otherwise, taking the next program control power supply as the current power supply in the FM mode and returning to the step S33;
s35, the car machine system automatically carries out AM full frequency point pre-scanning through the radio module, and caches the measured AM full frequency point pre-scanning data into a system memory;
s36, carrying out AM mode initialization, and taking the programmable power supply 1 as the current AM mode power supply;
s37, the car machine system scans the AM full frequency point under the current situation of the AM mode through the radio module and caches the AM full frequency point pre-scanning data under the current situation of the AM mode into a system memory, wherein the current situation of the AM mode is the situation that the current power supply of the AM mode is closed and the program-controlled power supplies of other current power supplies which are not in the AM mode are opened;
and S38, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the AM mode current power supply and returning to the step S37.
Further as a preferred embodiment, the on-board unit system compares and analyzes the full frequency point pre-scan data with the full frequency point pre-scan data of each time to locate the interference source, and includes:
the vehicle-mounted machine system respectively calculates the interference value change condition of the interference frequency point after each program-controlled power supply is turned off according to the full-frequency-point pre-scanning data and the full-frequency-point pre-scanning data of each time;
and the vehicle machine system determines the interference source of the interference frequency point according to the change condition of the interference value of the interference frequency point after each programmable power supply is turned off.
Further as a preferred embodiment, the step of determining, by the car machine system, an interference source of the interference frequency point according to the change condition of the interference value of the interference frequency point after each program-controlled power supply is turned off includes:
s41, judging whether the interference values of all interference frequency points are unchanged after any one of the program-controlled power supplies 1-N is turned off, and if yes, judging that the main controller is the only interference source; otherwise, go to step S42;
s42, judging whether the interference value of the partial interference frequency point is unchanged after the current program-controlled power supply is turned off, and if so, judging that the module corresponding to the current program-controlled power supply is not an interference source; otherwise, judging that the module corresponding to the current program-controlled power supply is one of the interference sources of the partial interference frequency point, and executing the step S43 after recording the interference value reduction value of the partial interference frequency point after the current program-controlled power supply is turned off; the current programmable power supply is any one of the programmable power supplies 1-N, the module corresponding to the current programmable power supply is the module corresponding to the current programmable power supply in the modules 1-N, and the partial interference frequency points are one or more of all the interference frequency points;
s43, judging whether the sum of the interference value reduction values of all interference sources of partial interference frequency points in the modules 1-N reaches a set threshold value, if so, judging that the main controller is not one of the interference sources of the partial interference frequency points, otherwise, judging that the main controller is also one of the interference sources of the partial interference frequency points.
Further as a preferred embodiment, a step S44 is further provided after the step S43, and the step S44 specifically is: and storing each interference frequency point and all interference sources corresponding to each interference frequency point in a report form.
Further as a preferred embodiment, the method further comprises the step of displaying the detection result of the interference source on an on-vehicle central control screen.
Further as a preferred embodiment, the method further comprises the step of storing the detection result of the interference source in a storage peripheral.
The invention will be further explained and explained with reference to the drawings and the embodiments in the description.
Example one
The embodiment provides a novel method for detecting an interference source of a vehicle-mounted central control frequency point, aiming at the problem of the mode that the existing vehicle-mounted central control (namely a vehicle-mounted system) needs to be frequently taken out of a shielding environment and disassembled to carry out radio performance test. According to the method, the vehicle-mounted central control firstly prescans and caches the whole radio frequency band spectrum through three modes preset by the system, then sequentially closes the program-controlled power supply of each module, and sequentially scans and caches the radio frequency band spectrum, and finally the vehicle-mounted central control compares the prescans with the cached sub-frequency spectrum to automatically obtain the influence of each module on frequency point testing, so that an interference source is quickly and accurately positioned.
According to the method, when the car machine needs to search for the interference source in the radio performance index test, a user enters the frequency point interference source searching mode through a touch screen operating instruction of the car machine system, and the car machine system can preset three frequency point interference source searching modes on a user interface, namely an FM mode, an AM mode and an FM + AM mode.
The structure of the car machine system of this embodiment is shown in fig. 2, and includes a main controller, a radio module, a storage peripheral, modules 1 to N-1, programmable power supplies 1 to N, a system memory, and other modules, where the main controller controls the on/off of the programmable power supplies 1 to N through a program, and further controls the on/off of the modules 1 to N-1 and the power supply of the system memory. The system memory may be implemented using EPROM. And the radio receiving module is used for carrying out radio receiving performance test. And the storage peripheral is used for storing the detected result data. Other modules comprise an input module and the like.
The specific implementation process of the interference source detection method of the embodiment is as follows:
(1) and placing the equipment to be tested in a shielding chamber and connecting a power supply.
The equipment to be tested can be used as one or more of the car machine system modules 1-N-1, so that the test is more convenient.
(2) An instruction is input into the car system shown in fig. 2 to enter a test mode, and the car radio frequency point interference search mode is selected (the implementation flow chart of the mode is shown in fig. 3, and a user can select a preset mode from an FM mode, an AM mode, and an FM + AM mode as required). As shown in fig. 3, for example, when the FM + AM mode is selected, the car-mounted device system starts to perform FM full frequency point pre-scanning automatically by using its own radio module, and stores the measured full frequency point pre-scanning data (i.e., the pre-scanning spectrum of the whole radio frequency band) in the system memory in a buffer manner, then closes the programmable power supply 1, performs FM full frequency point scanning again, and stores corresponding data; and then, the programmable power supply 2 is turned off, FM full frequency point scanning is carried out again, corresponding data … … are stored, and the FM full frequency point scanning is completed after the programmable power supply N is turned off after the FM full frequency point scanning is circularly carried out, at the moment, the vehicle machine system is automatically switched to an AM mode for full frequency point testing, and similarly, a full frequency point AM full frequency point scanning mode of the programmable power supply is sequentially turned off until the AM full frequency point scanning is completed after the programmable power supply N is turned off. And the vehicle-mounted system then compares and analyzes the full-frequency point data respectively called in the FM/AM mode, and stores the comparison and analysis result.
(3) After the storage is finished, the detection result is displayed on a display screen of the vehicle-mounted central control unit, and according to the requirement, the detection result can be stored to a storage peripheral device by clicking a storage function. The whole process of the embodiment is fully automatically executed.
The principle of searching the frequency point interference of the vehicle radio in the FM mode and the AM mode is the same as that of the FM + AM mode.
The basic principle of the comparative analysis in this embodiment is as follows: the full frequency point test data after the module corresponding to a certain programmable power supply is closed is compared with the full frequency point test data (namely, full frequency point pre-scanning data) when the whole machine normally works, for example: if the interference value of one or some interference frequency points is reduced after the module 1 corresponding to the programmable power supply 1 is turned off, it can be determined that the module 1 is one of the interference sources of the or these interference frequency points, and if the interference value of the interference frequency points is not changed after the module 1 corresponding to the programmable power supply 1 is turned off, it is indicated that the module 1 is not an interference source, and whether other modules are interference sources can be analyzed by a similar method. If the interference values of the partial interference frequency points are reduced to some extent but do not reach the standard after the modules 1 to N are closed after the sequential comparison (namely the sum of the interference value reduction values of all the interference sources does not reach the set threshold), the main controller is also one of the interference sources of the partial interference points, and if the interference values of all the interference frequency points are not changed after the modules 1 to N are closed after the sequential comparison is found, the main controller is the only interference source of the interference frequency points. Finally, all interference sources of all interference frequency points can be presented in a report form through analysis software.
The main control controller is used for controlling the main control controller to output the test result when the radio frequency point interference source is analyzed, the machine does not need to be disassembled, and additional devices such as an audio analyzer, a frequency spectrograph and a near-field probe are not needed.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method for detecting an interference source of a vehicle-mounted central control frequency point is characterized by comprising the following steps: the method comprises the following steps:
placing equipment to be tested in a shielding room, and connecting a power supply of a vehicle machine system, wherein the vehicle machine system comprises a main controller, a radio module, a storage peripheral, modules 1-N-1, program-controlled power supplies 1-N and a system memory, N is the total number of the program-controlled power supplies, the modules 1-N-1 are respectively connected with the program-controlled power supplies 1-N-1 in a one-to-one correspondence manner, and the program-controlled power supplies N are connected with the system memory;
the car machine system carries out searching and scanning of radio frequency point interference to obtain full frequency point pre-scanning data before the car machine system closes the programmable power supply 1-N and full frequency point scanning data of each time after the car machine system sequentially closes the programmable power supply 1-N;
the car machine system calculates the interference value change condition of the interference frequency point after the programmable power supply is sequentially turned off according to the full frequency point pre-scanning data before the programmable power supply is turned off by 1-N and the full frequency point scanning data after the programmable power supply is sequentially turned off by 1-N, and locates the interference source according to the interference value change condition, which specifically comprises:
step one, judging whether the interference values of all interference frequency points are unchanged after any one of the program-controlled power supplies 1-N is turned off, and if so, judging that the main controller is the only interference source; otherwise, executing the step two;
step two: judging whether the interference value of a partial interference frequency point is unchanged after the current program-controlled power supply is turned off, and if so, judging that a module corresponding to the current program-controlled power supply is not an interference source; otherwise, judging that the module corresponding to the current program-controlled power supply is one of the interference sources of the partial interference frequency point, and executing the step three after recording the interference value reduction value of the partial interference frequency point after the current program-controlled power supply is turned off; the current programmable power supply is any one of the programmable power supplies 1 to N, the module corresponding to the current programmable power supply is the module corresponding to the current programmable power supply in the modules 1 to N, and the partial interference frequency points are one or more of all the interference frequency points;
and step three, judging whether the sum of the interference value reduction values of all the interference sources of partial interference frequency points in the modules 1-N reaches a set threshold value, if so, judging that the main controller is not one of the interference sources of the partial interference frequency points, and otherwise, judging that the main controller is also one of the interference sources of the partial interference frequency points.
2. The method for detecting the interference source of the vehicle-mounted central control frequency point according to claim 1, characterized in that: the car machine system carries out radio frequency point interference searching and scanning to obtain the steps of full frequency point pre-scanning data before the car machine system closes the programmable power supply 1-N and full frequency point scanning data after the car machine system closes the programmable power supply 1-N in sequence, and the steps comprise:
the vehicle-mounted machine system selects one mode from three preset modes of an FM mode, an AM mode and an FM + AM mode as a radio frequency point interference searching mode;
and the vehicle machine system carries out searching and scanning on the radio frequency point interference in the corresponding mode according to the selected mode to obtain full frequency point pre-scanning data before the vehicle machine system closes the programmable power supply 1-N and full frequency point scanning data of each time after the vehicle machine system closes the programmable power supply 1-N in sequence.
3. The method for detecting the interference source of the vehicle-mounted central control frequency point according to claim 2, characterized in that: the car machine system carries out radio frequency point interference searching scanning of a corresponding mode according to the selected mode to obtain the step of full frequency point pre-scanning data before the car machine system closes the programmable power supply 1-N and full frequency point scanning data of each time after the car machine system closes the programmable power supply 1-N in sequence, and the step comprises the following steps:
s11, the car machine system automatically carries out FM full frequency point pre-scanning through the radio module according to the selected FM mode, and caches the measured FM full frequency point pre-scanning data into a system memory;
s12, initializing, and taking the programmable power supply 1 as the current power supply;
s13, the car machine system scans FM full frequency points under the current situation through the radio module and caches FM full frequency point scanning data under the current situation into a system memory, wherein the current situation is the situation that the current power supply is closed and the program-controlled power supplies of other non-current power supplies are opened;
and S14, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the current power supply and returning to the step S13.
4. The method for detecting the interference source of the vehicle-mounted central control frequency point according to claim 2, characterized in that: the car machine system carries out radio frequency point interference searching scanning of a corresponding mode according to the selected mode to obtain the step of full frequency point pre-scanning data before the car machine system closes the programmable power supply 1-N and full frequency point scanning data of each time after the car machine system closes the programmable power supply 1-N in sequence, and the step comprises the following steps:
s21, the car machine system automatically carries out AM full frequency point pre-scanning through the radio module according to the selected AM mode, and caches the measured AM full frequency point pre-scanning data into a system memory;
s22, initializing, and taking the programmable power supply 1 as the current power supply;
s23, the car machine system scans the AM full frequency point under the current situation through the radio module and caches the AM full frequency point scanning data under the current situation into a system memory, wherein the current situation is the situation that the current power supply is closed and the program-controlled power supplies of other non-current power supplies are opened;
and S24, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the current power supply and returning to the step S23.
5. The method for detecting the interference source of the vehicle-mounted central control frequency point according to claim 2, characterized in that: the car machine system carries out radio frequency point interference searching scanning of a corresponding mode according to the selected mode to obtain the step of full frequency point pre-scanning data before the car machine system closes the programmable power supply 1-N and full frequency point scanning data of each time after the car machine system closes the programmable power supply 1-N in sequence, and the step comprises the following steps:
s31, the car machine system automatically carries out FM full frequency point pre-scanning through the radio module according to the selected FM + AM mode, and caches the measured FM full frequency point pre-scanning data into a system memory;
s32, initializing an FM mode, and taking the programmable power supply 1 as the current power supply of the FM mode;
s33, the vehicle-mounted system scans the FM full frequency points under the current condition of the FM mode through the radio module and caches the FM full frequency point scanning data under the current condition of the FM mode into a system memory, wherein the current condition of the FM mode is the condition that the current power supply of the FM mode is closed and the program-controlled power supplies of other current power supplies which are not the FM mode are opened;
s34, judging whether the current power supply in the FM mode is the program control power supply N, if so, executing the step S35, otherwise, taking the next program control power supply as the current power supply in the FM mode and returning to the step S33;
s35, the car machine system automatically carries out AM full frequency point pre-scanning through the radio module, and caches the measured AM full frequency point pre-scanning data into a system memory;
s36, carrying out AM mode initialization, and taking the programmable power supply 1 as the current AM mode power supply;
s37, the car machine system scans the AM full frequency point under the current situation of the AM mode through the radio module and caches the AM full frequency point pre-scanning data under the current situation of the AM mode into a system memory, wherein the current situation of the AM mode is the situation that the current power supply of the AM mode is closed and the program-controlled power supplies of other current power supplies which are not in the AM mode are opened;
and S38, judging whether the current power supply is the program control power supply N, if so, ending the radio frequency point interference searching and scanning process, otherwise, taking the next program control power supply as the AM mode current power supply and returning to the step S37.
6. The method for detecting the interference source of the vehicle-mounted central control frequency point according to claim 1, characterized in that: step S44 is further provided after the third step, where step S44 specifically is: and storing each interference frequency point and all interference sources corresponding to each interference frequency point in a report form.
7. The method for detecting the interference source of the vehicle-mounted central control frequency point according to any one of claims 1 to 6, characterized in that: the method also comprises the step of displaying the detection result of the interference source on a vehicle-mounted central control screen.
8. The method for detecting the interference source of the vehicle-mounted central control frequency point according to any one of claims 1 to 6, characterized in that: the method also comprises the step of storing the detection result of the interference source in a storage peripheral.
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| CN109982331B (en) * | 2019-03-29 | 2023-02-07 | 上海翎沃电子科技有限公司 | Spectrum interference back-off selection method and system |
| CN113189415A (en) * | 2021-04-07 | 2021-07-30 | 一汽奔腾轿车有限公司 | Fuel vehicle electromagnetic interference positioning method based on fault matrix |
| CN113219273A (en) * | 2021-04-07 | 2021-08-06 | 一汽奔腾轿车有限公司 | Electric vehicle electromagnetic interference positioning method based on fault matrix |
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