CN202719988U - Combination instrument for automobiles based on imaging TFT - Google Patents
Combination instrument for automobiles based on imaging TFT Download PDFInfo
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- CN202719988U CN202719988U CN 201220326290 CN201220326290U CN202719988U CN 202719988 U CN202719988 U CN 202719988U CN 201220326290 CN201220326290 CN 201220326290 CN 201220326290 U CN201220326290 U CN 201220326290U CN 202719988 U CN202719988 U CN 202719988U
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Abstract
The utility model discloses a combination instrument for automobiles based on an imaging TFT, which comprises a processing unit, a CAN bus module, a sensor module, an alarm module, an instrument backlight module, a gauge outfit module, a TFT liquid crystal module, an interface module, a power module and a storage module, wherein the CAN bus module, the sensor module, the alarm module, the instrument backlight module, the gauge outfit module, the TFT liquid crystal module, the interface module, the power module and the storage module are connected with ports of the processing unit respectively. TFT liquid crystal display adopts an imaging mode, thereby being capable of displaying a vehicle driving condition, an alarm condition, a tire pressure condition and a trip computer condition visually. In addition, the combination instrument can simplify wiring harnesses of automobiles to the maximum degree, enhances the control function, improves safety assurance, and is complete is information reflection and strong in anti-interference ability. The CAN bus of the combination instrument is isolated by adopting a common mode inductor, thereby preventing irretrievable damages on a CAN processing circuit.
Description
Technical field
The utility model relates to automobile instrument device, particularly relates to a kind of automobile combination meter based on graphical TFT.
Background technology
The obtaining and driver's feedback finished by separate equipment often of traditional vehicle traveling information.Obtain the information such as the current driving speed of a motor vehicle, amount of fuel by the pointer on the automobile instrument panel such as the driver; Obtain the information such as accumulative mileage, hypervelocity record by special vehicle-mounted Tachographs; Tire pressure monitoring system by special installation obtains current tire pressure, tire temperature information etc.The method of this traditional acquisition of information and demonstration because equipment room separate, lack corresponding information sharing, lack systematicness, often with the signal specific of part as basis for estimation, therefore when safety problem appears in automobile, can't coordinate between each equipment, can not make the most reasonably dangerous situation and judging.In addition, it is single that traditional driving information obtains equipment form aspect the demonstration of information, friendly not on human-computer interaction interface, can't satisfy the growing demand for good human-computer interaction interface of modern society people.Meanwhile, along with vehicle body ECU (Electrical Control Unit) number is more and more, be necessary by bussing technique control module numerous in the car (node) to be linked up, form the LAN of automotive interior, realize information sharing, reduce wire harness, improve maintainable.Therefore, the inevitable future development towards integrated, graphical and networking of the equipment that obtains of driving information.
Given this, the inventor designs a kind of automobile combination meter based on graphical TFT, overcomes the defective of above-mentioned existence, and this case produces thus.
Summary of the invention
The purpose of this utility model just provides a kind of automobile combination meter based on graphical TFT, adopt graphical TFT display mode, lump line style automobile instrument function, tire pressure monitoring system function and car running computer function are in one, and connection is simple, antijamming capability is strong, and stability is high.
To achieve these goals, solution of the present utility model is:
Automobile instrument based on the CAN bus, comprise processing unit, and the CAN bus module, sensor assembly, alarm module, instrument backlight module, gauge outfit module, TFT Liquid Crystal Module, interface module, power module and the memory module that link to each other with each port of processing unit; Wherein, described sensor assembly connects processes unit simulation amount input end, comprises mileage pulse signal treatment circuit and fuel sensor signal processing circuit; Described gauge outfit module connects the pulse output end of processing unit, 2 stepper motors that comprise mileage gauge outfit, rotating speed gauge outfit and drive above-mentioned gauge outfit.
Described processing unit adopts the MC9S12HY64 chip, and this chip has 16 automotive grade single-chip microcomputers of the multiple peripheral functions such as CAN processor, the output of PWM/ frequency division, 10 A/D, lcd controller.
Described CAN bus module connects the data transmit-receive end of processing unit, and this module comprises CAN interface chip, common mode inductance transient suppressor, terminal resistance and filtering circuit; The input end of CAN interface chip connects common mode inductance transient suppressor and filtering circuit successively, the output terminal of CAN interface chip is connected to the input end of processing unit, terminal resistance comprises two mutually resistance of series connection, be connected between common mode inductance transient suppressor and the filtering circuit, its Main Function provides the CAN terminal to determine level for eliminating the signal reflex in telecommunication cable.
Alarm module comprises that the LED lamp is reported to the police and hummer sound is reported to the police, and these two parts have formed the acoustooptic alarm system of automobile jointly, can increase human pilot to the understanding of vehicle condition, improve the security of automobile.Wherein the LED lamp is reported to the police, and part is divided into direct control and processing unit is judged two kinds of circuit of control, and hummer is by the PWM control of processing unit.
The instrument backlight module provides backlight for instrument, by the control of the lampet switch of automobile, travels under the environment of light dark, opens that instrument is backlight can to know clearly the vehicle driving informations such as rotating speed of automobile engine, the speed of a motor vehicle very much.Instrument employing processing unit backlight PWM drives control and realizes.
The TFT Liquid Crystal Module is connected on the liquid crystal drive end of processing unit, shows data and tire pressure state and the car running computer state of fuel oil and water temperature.
Interface module connects processing unit for connecting the tie of automobile instrument and car electrics, is mainly used in transmitting automobile instrument various signals to be expressed.Such as the vehicle speed sensor signal, the fuel sensor signal, instrument power and various AIS are the connection hinges between instrument and the automobile.
The externally fed end of processing unit connects power module.
The storage chip that memory module connects the processing unit use is the E2PROM chip of the 8K of atmel corp.The data that stores meter need to be preserved are such as mileage subtotal and accumulative total etc.
The mileage pulse signal treatment circuit of described sensor assembly is divided into three processing sections, and first is the low-pass filter circuit of signal, the high-frequency signal in the filtered signal; Second portion is level shifting circuit; Third part is the rear class low-pass filter circuit.Described fuel sensor signal processing circuit is divided into two parts, and first is the pull-up resistor of signal; Second portion is signal filter circuit.
After adopting such scheme, graphical TFT display mode, lump line style automobile instrument function, tire pressure monitoring system function and car running computer function be in one, and can maximize simplify automotive wire bundle, strengthen control function, raising safety assurance, message reflection be complete, antijamming capability is strong.Wherein the CAN bus in the utility model adopts common mode inductance to isolate, and prevents that the irrecoverability of CAN treatment circuit from destroying, and CAN bus itself has the high resistance electromagnetic interference (EMI) in addition, speed is fast, distance, the data error rate is extremely low, priority is set satisfies the characteristics such as different real-times.
Description of drawings
Fig. 1 is the modular structure schematic diagram of the utility model preferred embodiment;
Fig. 2 is the pinouts of the processing unit of the utility model preferred embodiment;
Fig. 3 is the CAN bus module circuit diagram of the utility model preferred embodiment;
Fig. 4 is the sensor module circuit diagram of the utility model preferred embodiment;
Fig. 5 is the alarm module circuit diagram of the utility model preferred embodiment;
Fig. 6 is the instrument backlight module circuit diagram of the utility model preferred embodiment;
Fig. 7 is the gauge outfit module circuit diagram of the utility model preferred embodiment;
Fig. 8 is the TFT Liquid Crystal Module circuit diagram of the utility model preferred embodiment;
Fig. 9 is the interface module circuit diagram of the utility model preferred embodiment;
Figure 10 is the power module circuitry figure of the utility model preferred embodiment;
Figure 11 is the memory module circuit diagram of the utility model preferred embodiment;
Figure 12 is the debug port circuit diagram of the utility model preferred embodiment;
Figure 13 is the key circuit figure of the utility model preferred embodiment.
Embodiment
As shown in Figure 1, the utility model preferred embodiment comprises processing unit 1 and the CAN bus module 2 that links to each other with its each pin, sensor assembly 3, alarm module 4, instrument backlight module 5, gauge outfit module 6, TFT Liquid Crystal Module 7, interface module 8, power module 9 and memory module 10.
In the present embodiment, processing unit 1 adopts the MC9S12HY64 chip of freescale company, and this chip is 16 automotive grade single-chip microcomputers with peripheral functions such as CAN processor, the output of PWM/ frequency division, 10 A/D, lcd controllers.MC9S12HY64 adopts 6 core BDM interfaces to carry out program and downloads, and its abundant peripheral IO resource can be saved the IO mouth expansion of input and output, and integrated level is higher.Its peripheral connecting circuit as shown in Figure 2, the pin RXCAN in the MC9S12HY64 chip is connected CAN bus module 2 with pin TXCAN, 82 pin of MC9S12HY64 chip with are connected pin and connect respectively alarm module 4 and instrument backlight module 5.7 of TFT Liquid Crystal Modules directly are connected to the control pin of processing unit 1.The externally fed end of processing unit 1 connects power module 9.Memory module 10 connects processing unit 83 pin and 84 pin.
As shown in Figure 3, CAN bus module 2 comprises CAN interface chip 21, common mode inductance transient suppressor 22, terminal resistance 23 and filtering circuit 24.
The model that CAN interface chip 21 adopts is TJA1050T, and its input end connects common mode inductance transient suppressor 22, is used for filtering this undesired signal of common-mode point.Also be connected with terminal resistance 23 and filtering circuit 24 on the input end of common mode inductance transient suppressor 22 in turn, circuit is carried out rectification.
Mileage pulse signal treatment circuit 31 is divided into three processing sections, and first is the low-pass filter circuit of signal, the high-frequency signal in the filtered signal, and by device 2R19,2R20,2C10,2R21 and 2R22 form; Second portion is level shifting circuit, is comprised of device 2T6 and 2R23, and the high level that odometer sensor is processed is that to become processing unit 1 collectable high level be the 5V pulse signal to the pulses switch of 8 ~ 12V; Third part is that the rear class low-pass filter circuit is comprised of 2R23 and 2C11.The real-time speed of the current running car of mileage pulse response signal, the total kilometrage number of record running car.Fuel sensor signal processing circuit 33 is divided into two parts, and first is the pull-up resistor of signal, by device R 20, Q3, C20, R22, Q4, R23, C21, R48 forms, and is complementary with the sensor resistance signal and extracts voltage signal on the sensor resistance, wherein R20, Q3, C20, R22, Q4 forms the power control circuit of pull-up resistor, the automobile flameout state can deenergization so that fuel sensor is in off position, satisfy the low-power consumption requirement when guaranteeing the instrument dormancy; Second portion is signal filter circuit, by device R 25, if the signal that C23 composition group is come to sensor plays the effect of filtering, the effect that while R25 also has current limliting, connect the signal of other 12V such as contingency fuel sensor signaling interface, can not destroy processing unit 1 yet, if do not have R25 or R25 too small, the collection pin of break treat with unit 1 probably then.Water temperature signal is also from the CAN bus.Wherein, fuel sensor 33 is connected to the analog input pin on the MC9S12HY64 chip.
Gauge outfit module 6 has two stepper motor driven mileage gauge outfits and rotating speed gauge outfit as shown in Figure 7, drives pin by the stepper motor of processing unit 1 and directly drives control.
TFT Liquid Crystal Module 7 is illustrated in figure 8 as the lattice lcd of 128*64, directly is connected to processing unit 1 control pin.Its intermediate fuel oil and water temperature gauge outfit show in this TFT Liquid Crystal Module.
In addition, go back auxiliary tone examination port (such as Figure 12) and operation push-button (such as Figure 13) in the present embodiment, operation push-button is connected on the MC9S12HY64 chip, and speedometer for automobile is carried out the subtotal zero clearing, and display interface switches, the functions such as parameter modification.The debug port simulation provides the instrument pulse, analog quantity, and the CAN signal is realized the function to the various signal debugging of instrument.
The utlity model has perfect alarm module, can directly report to the police to the signal that the automobile rigid line is drawn, also can report to the police to the signal after processing through processing unit 1.
Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present utility model to its suitable variation or modification of doing.
Claims (9)
1. based on the automobile combination meter of graphical TFT, it is characterized in that: comprise processing unit, and the CAN bus module, sensor assembly, alarm module, instrument backlight module, gauge outfit module, TFT Liquid Crystal Module, interface module, power module and the memory module that link to each other with each port of processing unit; Wherein, described sensor assembly connects processes unit simulation amount input end, comprises mileage pulse signal treatment circuit and fuel sensor signal processing circuit; Described gauge outfit module connects the pulse output end of processing unit, 2 stepper motors that comprise mileage gauge outfit, rotating speed gauge outfit and drive above-mentioned gauge outfit.
2. such as the described automobile combination meter based on graphical TFT of claim 1, it is characterized in that: described processing unit adopts the MC9S12HY64 chip.
3. such as the described automobile combination meter based on graphical TFT of claim 1, it is characterized in that: described CAN bus module connects the data transmit-receive end of processing unit, and this module comprises CAN interface chip, common mode inductance transient suppressor, terminal resistance and filtering circuit; The input end of CAN interface chip connects common mode inductance transient suppressor and filtering circuit successively, the output terminal of CAN interface chip is connected to the input end of processing unit, terminal resistance comprises two mutually resistance of series connection, is connected between common mode inductance transient suppressor and the filtering circuit.
4. such as the described automobile combination meter based on graphical TFT of claim 1, it is characterized in that: alarm module comprises that the LED lamp is reported to the police and hummer sound is reported to the police, wherein, the LED lamp is reported to the police and is divided into direct control and processing unit judgement control, and hummer sound is reported to the police by the PWM control of processing unit.
5. such as the described automobile combination meter based on graphical TFT of claim 1, it is characterized in that: the instrument backlight module drives the control realization by the PWM of processing unit.
6. such as the described automobile combination meter based on graphical TFT of claim 1, it is characterized in that: the TFT Liquid Crystal Module is connected on the liquid crystal drive end of processing unit.
7. such as the described automobile combination meter based on graphical TFT of claim 1, it is characterized in that: the externally fed end of processing unit connects power module.
8. such as the described automobile combination meter based on graphical TFT of claim 1, it is characterized in that: memory module adopts the E2PROM chip of the 8K of atmel corp.
9. such as the described automobile combination meter based on graphical TFT of claim 1, it is characterized in that: the mileage pulse signal treatment circuit of described sensor assembly is divided into three processing sections, and first is the low-pass filter circuit of signal; Second portion is level shifting circuit; Third part is the rear class low-pass filter circuit; Described fuel sensor signal processing circuit is divided into two parts, and first is the pull-up resistor of signal; Second portion is signal filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220326290 CN202719988U (en) | 2012-07-06 | 2012-07-06 | Combination instrument for automobiles based on imaging TFT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220326290 CN202719988U (en) | 2012-07-06 | 2012-07-06 | Combination instrument for automobiles based on imaging TFT |
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| Publication Number | Publication Date |
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| CN202719988U true CN202719988U (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220326290 Expired - Fee Related CN202719988U (en) | 2012-07-06 | 2012-07-06 | Combination instrument for automobiles based on imaging TFT |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104494445A (en) * | 2014-12-17 | 2015-04-08 | 绍兴四环怡东仪表有限公司 | Mine vehicle instrument assembly |
| CN104698914A (en) * | 2014-11-24 | 2015-06-10 | 中外合资沃得重工（中国）有限公司 | Engineering machinery digital graph instrument |
| CN105564244A (en) * | 2014-10-13 | 2016-05-11 | 大陆汽车车身电子系统（芜湖）有限公司 | Vehicle meter information display method based on scene |
| CN110370930A (en) * | 2019-08-23 | 2019-10-25 | 河南科技大学 | CAN bus based electric tractor virtual instrument |
-
2012
- 2012-07-06 CN CN 201220326290 patent/CN202719988U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105564244A (en) * | 2014-10-13 | 2016-05-11 | 大陆汽车车身电子系统（芜湖）有限公司 | Vehicle meter information display method based on scene |
| CN105564244B (en) * | 2014-10-13 | 2019-01-01 | 大陆汽车车身电子系统（芜湖）有限公司 | Automobile instrument information display method based on scene |
| CN104698914A (en) * | 2014-11-24 | 2015-06-10 | 中外合资沃得重工（中国）有限公司 | Engineering machinery digital graph instrument |
| CN104494445A (en) * | 2014-12-17 | 2015-04-08 | 绍兴四环怡东仪表有限公司 | Mine vehicle instrument assembly |
| CN110370930A (en) * | 2019-08-23 | 2019-10-25 | 河南科技大学 | CAN bus based electric tractor virtual instrument |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130206 Termination date: 20180706 |
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| CF01 | Termination of patent right due to non-payment of annual fee |