CN108072796A - A kind of interference source localization method and device of vehicle-mounted multimedia terminal - Google Patents
A kind of interference source localization method and device of vehicle-mounted multimedia terminal Download PDFInfo
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- CN108072796A CN108072796A CN201610999138.6A CN201610999138A CN108072796A CN 108072796 A CN108072796 A CN 108072796A CN 201610999138 A CN201610999138 A CN 201610999138A CN 108072796 A CN108072796 A CN 108072796A
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- circuit
- vehicle
- mounted multimedia
- interference source
- multimedia terminal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A kind of interference source localization method and device of vehicle-mounted multimedia terminal first increases switch to control the break-make of power supply respectively to each functional circuit of vehicle mounted multimedia；Then the MCU of vehicle mounted multimedia is controlled to start radio and carries out tuning, each power supply for disconnecting a functional circuit and the respectively signal intensity difference for the same frequency point that comparison is fed back for electrically disconnected front and rear radio are controlled, so that it is determined that interference source.The present invention combines software and hardware, realizes quick investigation and positioning circuit interference source, simplifies vehicle-mounted multimedia terminal Electro Magnetic Compatibility rectification testing procedure, shortens rectification test period, improve product development efficiency.
Description
Technical field
The present invention relates to the interference source localization methods and dress in mobile unit field, particularly a kind of vehicle-mounted multimedia terminal
It puts.
Background technology
The radio receiver module of vehicle-mounted multimedia terminal is the highest vehicle of most common in vehicle electronic device and subscriber usage
Information carrying breath one of entertainment configuration provides the essential element that advanced broadcast audience experiences for driver and passenger.Some circuits by
Circuit is caused to lead to the problem of conduct and radiation interference, make in device layout and cabling or the design of chip periphery device are unreasonable etc.
It is low into radio poor sensitivity, signal-to-noise ratio, the experience of user is directly affected, and causes vehicle-mounted multimedia terminal Electro Magnetic Compatibility
It is bad, the electromagnetic compatibility test of depot can not be passed through.
Therefore need quickly to search the interference source with positioning circuit in product development process, then carry out circuit rectification test.It passes
The method of system investigation circuit interference source is using the artificial device for removing some circuit step by step using soldering iron, is swept step by step with frequency spectrum
The spectrum waveform figure that instrument scans exceeded frequency point is retouched, the spectrum waveform for removing or increasing before and after device shown by spectrum scan instrument
Comparison, the interference source of positioning circuit.The method of tradition investigation circuit interference source is handled mainly by manual intervention, has rectification test
Complex steps rectify and improve the shortcomings of test period is longer, testing expense cost is higher.
The content of the invention
It is a primary object of the present invention to overcome drawbacks described above of the prior art, a kind of simplified testing procedure, contracting are proposed
Short rectification test period, quick investigation and the interference source localization method and device of the vehicle-mounted multimedia terminal in location interference source.
The present invention adopts the following technical scheme that：
A kind of interference source localization method of vehicle-mounted multimedia terminal, it is characterised in that：First to each work(of vehicle mounted multimedia
Energy circuit increases switch to control the break-make of power supply respectively；Then the MCU of vehicle mounted multimedia is controlled to start radio and carries out tuning,
Control disconnect every time the power supply of a functional circuit and respectively comparison for the same frequency point of electrically disconnected front and rear radio feedback
Signal intensity difference, so that it is determined that interference source.
Preferably, the switch on and off that the MCU passes through the GPIO mouthfuls of each functional circuits of gradual control.
Preferably, the MCU carries out tuning by I2C bus marcos radio and receives the signal of feedback.
Preferably, the functional circuit includes Bluetooth circuit, power amplifier, liquid crystal display backlight circuit, camera circuit, regards
It is two or more in frequency AD circuits, CAN communication circuit.
Preferably, the MCU controls vehicle mounted multimedia shows test result.
A kind of interference source positioner of vehicle-mounted multimedia terminal, including
Radio starts tuning by control and sends frequency point information；
Multiple switch connects one to one and with the feeder ear of multiple functional circuits by the break-make of MCU control power supplies respectively；
MCU is connected with radio and multiple switch, to control the power supply of one functional circuit of disconnection every time and compare respectively
The signal intensity difference of the same frequency point of radio feedback before and after break-make of powering, so that it is determined that interference source；
Display device is connected to show test result with MCU.
Preferably, the multiple functional circuit includes Bluetooth circuit, power amplifier, liquid crystal display backlight circuit, camera electricity
It is two or more in road, video AD circuit, CAN communication circuit.
Preferably, the switch is metal-oxide-semiconductor.
From the above-mentioned description of this invention, compared with prior art, the present invention has the advantages that：
1st, methods and apparatus of the present invention with reference to software and hardware, is realized quick investigation and positioning circuit interference source, is simplified
Vehicle-mounted multimedia terminal Electro Magnetic Compatibility rectifies and improves testing procedure, shortens rectification test period, improves product development efficiency.
2nd, methods and apparatus of the present invention by switch being set to control break-make each functional circuit, passes through GPIO mouthfuls
Gradual control switch on and off, hardware configuration is simple, control mode is reliable.
3rd, methods and apparatus of the present invention, by the way that radio tuning is controlled to feed back frequency point information, backstage automatic comparison is single
Switch disconnects front and rear data difference, draws the functional circuit of interference, step is simple, test result is accurate.
Description of the drawings
Fig. 1 is functional block diagram of the present invention；
Fig. 2 is the broad flow diagram of the present invention；
Fig. 3 stores flow chart for frequency point signal of the present invention.
Specific embodiment
Below by way of specific embodiment, the invention will be further described.
Referring to figs. 1 to Fig. 3, a kind of interference source localization method of vehicle-mounted multimedia terminal, this method passes through software and hardware combining
It realizes.In hardware components, switch is increased respectively to each functional circuit of vehicle mounted multimedia so that corresponding function circuit to be controlled to power
Break-make, the functional circuit include Bluetooth circuit, power amplifier, liquid crystal display backlight circuit, camera circuit, video AD electricity
Road, CAN communication circuit are medium.The break-make for each functional circuit of GPIO mouth gradual controls that software section passes through vehicle mounted multimedia MCU,
I2C communication control starts radio and carries out tuning and lock station, and records frequency point, before and after each functional circuit break-make of automatic comparison
The frequency point of test shows test result.Specific testing procedure is as follows：
1) vehicle mounted multimedia enters test page, and MCU controls the power switch of each functional circuit in the conduction state,
2) MCU carries out I2C communications with radio, and control radio opens tuning；
3) MCU receives the signal strength of the frequency point of radio feedback, and records and save as test data 1, the test data 1
Including functional circuit title, the frequency and signal strength of frequency point；
4) MCU control one of functional circuit (such as：Bluetooth circuit) switch GPIO output low level so that should
Functional circuit (Bluetooth circuit) is in non-working condition, repeats step 2) -3), it is disconnected that record stores the functional circuit (Bluetooth circuit)
Test data 2 after opening, test data 2 include functional circuit title, the frequency and signal strength of frequency point；
5) MCU compares the functional circuit (Bluetooth circuit) for electrically disconnected front and rear test data 1 and test data 2, if
The difference of test number before and after the signal strength of some frequency point is more than default threshold value, such as is arranged to 35 (threshold value is electricity
The empirical value of magnetic compatibility laboratory test), illustrate what the frequency point generated for the functional circuit (Bluetooth circuit).
6) MCU controls the switch of the functional circuit to be closed in the conduction state, then controls the confession of other functional circuits one by one
2) electricity condition enters step, until the detection of all functional circuits finishes.
7) MCU controls vehicle mounted multimedia to show test result in test interface, and display content is：Certain functional circuit (bluetooth
Circuit) be powered for interference source and the functional circuit before and after the signal strength of frequency point fed back of radio.So as to intuitively show electricity
The interference source on road, the quantity of the interference source can be one or more.
Based on above-mentioned method, the present invention also proposes a kind of interference source positioner of vehicle-mounted multimedia terminal, including
Radio starts tuning by control and sends frequency point information, which includes signal strength and frequency；
Multiple switch, the break-make for connecting one to one with the feeder ear of multiple functional circuits and being powered by MCU controls respectively,
The plurality of functional circuit includes Bluetooth circuit, power amplifier, liquid crystal display backlight circuit, camera circuit, video AD circuit, CAN
Telecommunication circuit etc..The switch switchs for metal-oxide-semiconductor.
MCU is connected with radio and multiple switch, to control the power supply of one functional circuit of disconnection every time and compare respectively
The signal intensity difference of the same frequency point of radio feedback before and after break-make of powering, so that it is determined that interference source；
Display device is connected to show test result with MCU.
Methods and apparatus of the present invention with reference to software and hardware, realizes quick investigation and positioning circuit interference source, simplifies vehicle
Multimedia terminal Electro Magnetic Compatibility rectification testing procedure is carried, shortens rectification test period, improves product development efficiency.
The specific embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto, it is all to utilize this
Conceive the change that unsubstantiality is carried out to the present invention, the behavior for invading the scope of the present invention should all be belonged to.
Claims (8)
1. a kind of interference source localization method of vehicle-mounted multimedia terminal, it is characterised in that：First to each function of vehicle mounted multimedia
Circuit increases switch to control the break-make of power supply respectively；Then the MCU of vehicle mounted multimedia is controlled to start radio and carries out tuning, control
System disconnects the power supply of a functional circuit and compares the letter of the same frequency point for electrically disconnected front and rear radio feedback respectively every time
Number strength difference, so that it is determined that interference source.
2. a kind of interference source localization method of vehicle-mounted multimedia terminal as described in claim 1, it is characterised in that：The MCU
Pass through the switch on and off of the GPIO mouthfuls of each functional circuits of gradual control.
3. a kind of interference source localization method of vehicle-mounted multimedia terminal as described in claim 1, it is characterised in that：The MCU
Tuning is carried out by I2C bus marcos radio and receives the signal of feedback.
4. a kind of interference source localization method of vehicle-mounted multimedia terminal as described in claim 1, it is characterised in that：The function
Circuit is included in Bluetooth circuit, power amplifier, liquid crystal display backlight circuit, camera circuit, video AD circuit, CAN communication circuit
It is two or more.
5. a kind of interference source localization method of vehicle-mounted multimedia terminal as described in claim 1, it is characterised in that：The MCU
Vehicle mounted multimedia is controlled to show test result.
6. a kind of interference source positioner of vehicle-mounted multimedia terminal, including
Radio starts tuning by control and sends frequency point information；
Multiple switch connects one to one and with the feeder ear of multiple functional circuits by the break-make of MCU control power supplies respectively；
MCU is connected with radio and multiple switch, to control the power supply for disconnecting a functional circuit every time and comparison power supply respectively
The signal intensity difference of the same frequency point of radio feedback before and after break-make, so that it is determined that interference source；
Display device is connected to show test result with MCU.
7. a kind of interference source positioner of vehicle-mounted multimedia terminal as claimed in claim 6, it is characterised in that：It is the multiple
Functional circuit includes Bluetooth circuit, power amplifier, liquid crystal display backlight circuit, camera circuit, video AD circuit, CAN communication electricity
It is two or more in road.
8. a kind of interference source positioner of vehicle-mounted multimedia terminal as claimed in claim 6, it is characterised in that：The switch
For metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610999138.6A CN108072796A (en) | 2016-11-14 | 2016-11-14 | A kind of interference source localization method and device of vehicle-mounted multimedia terminal |
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| CN201610999138.6A CN108072796A (en) | 2016-11-14 | 2016-11-14 | A kind of interference source localization method and device of vehicle-mounted multimedia terminal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109150682A (en) * | 2018-11-02 | 2019-01-04 | 广州小鹏汽车科技有限公司 | A kind of interference source detection method and device |
| CN109460017A (en) * | 2018-09-14 | 2019-03-12 | 杭州朗迅科技有限公司 | Automatic Track Finding car controller and GaN base switch power module test macro |
| CN112288315A (en) * | 2020-11-13 | 2021-01-29 | 深圳市车可讯科技有限公司 | EMC design method for vehicle-mounted electronics |
| 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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| 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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Application publication date: 20180525 |