CN201626358U

CN201626358U - Automobile instrument based on CAN bus

Info

Publication number: CN201626358U
Application number: CN2010201492617U
Authority: CN
Inventors: 马敏杰
Original assignee: ZHEJIANG AUTOMOBILE INSTRUMENT CO Ltd
Current assignee: ZHEJIANG AUTOMOBILE INSTRUMENT CO Ltd
Priority date: 2010-04-02
Filing date: 2010-04-02
Publication date: 2010-11-10
Anticipated expiration: 2020-04-02

Abstract

The utility model mainly discloses an automobile instrument based on a CAN bus, which comprises a processing unit, a CAN BUS module, an acquisition module, a shifting output module, a PWM/frequency dividing module, an instrument head module and a liquid crystal module. The CAN BUS module is connected with a data receiving and transmitting end of the processing unit, the acquisition module is connected to an input end of the processing unit, the shifting output module is connected to an output end of the processing unit, the PWM/frequency dividing module is connected to the output end of the processing unit, the instrument head module is connected to a pulse output end of the processing unit, and the liquid crystal module is connected onto a liquid crystal driving end of the processing unit. The automobile instrument has the advantages of simplified automobile wiring harness, strengthened control function, improved safety guarantee, complete information reflection, strong interference resistance and the like.

Description

Auto meter based on the CAN bus

Technical field

The utility model relates to automobile instrument device, and is particularly relevant with a kind of auto meter based on the CAN bus.

Background technology

Development along with automotive electronic technology, electronic control unit on the automobile (ECU) is also more and more, employing can be satisfied multiplexed bus communication system, each ECU can be connected to become a network, transmit data and information in the mode of sharing, realize the digital communication and the controllable function of networking.

Therefore, based on simplifying automotive wire bundle, enhancing controllable function, raising safety assurance, reducing many-sided considerations such as fuel oil consumption, saving manufacturing cost, digitalisation In-vehicle networking technology will be brought a huge leap for automotive electronic industry, and CAN (abbreviation of Controller AreaNetwork is the serial communication protocol of ISO international standarkdization) bus is a component part important in the vehicle netbios.

At present, the CAN bus is widely used in the network service of automobile dynamic system and bodywork system and control.Auto meter is as the part of body control system, problems such as automotive wire bundle, enhancing controllable function, raising safety assurance, reduction fuel oil consumption, saving manufacturing cost are also more and more urgent for simplifying, car load factory is many at the conventional instrument wire harness of usefulness at present, connect complicated, message reflection is incomplete, a little less than the antijamming capability.

Given this, the inventor designs a kind of auto meter based on the CAN bus, overcomes the defective of above-mentioned existence, and this case produces thus.

The utility model content

The purpose of this utility model just provides a kind of auto meter based on the CAN bus, connects simply, and antijamming capability is strong, the auto meter that stability is high.

To achieve these goals, solution of the present utility model is:

Based on the auto meter of CAN bus, comprise processing unit, CAN BUS module, acquisition module, displacement output module, PWM/ frequency division module, gauge outfit module, Liquid Crystal Module; The data transmit-receive end of CAN BUS module connection processing unit, the collection module is connected the processing unit input end, the displacement output module is connected the mouth of processing unit, the PWM/ frequency division module is connected the mouth of processing unit, the pulse output end of gauge outfit module connection processing unit, Liquid Crystal Module is connected on the liquid crystal drive end of processing unit.

Described processing unit adopts auspicious Sa science and technology H8S2282 chip.

Described gauge outfit module comprises that mileage, rotating speed, fuel oil and four of water temperatures are used for the stepping motor of control instrument pointer.

The externally fed end of described processing unit connects power module.

Described interface module connects auto meter and other electric components of automobile, transmission auto meter various signals to be expressed.

Described acquisition module comprises sensor assembly and switching value module, and sensor assembly comprises fuel sensor, evaporator temperature sensor, environment temperature sensor; The switching value module comprises air-conditioning A/C request collecting unit, brake troubles collecting unit and four wheel drive locking collecting unit.

Described CAN BUS module comprises CAN interface chip, common mode inductance transient suppressor, terminal resistance and filter circuit composition; The input end of CAN interface chip connects the common mode inductance transient suppressor successively, eliminates terminal resistance, the filter circuit of signal reflex in the communication cable, and the mouth of CAN interface chip is connected to the input end of processing unit.

The RTC module of described processing unit adopts the PCF8563 of PHILIPS Co. chip.

Described displacement output module comprises that two parallel port pio chip CD4094 are composed in series, and mouth is connected with the auto meter warning circuit; The PWM/ frequency division module comprises output of speed of a motor vehicle frequency division and water temperature PWM output.

After adopting such scheme, the utility model realizes adopting the CAN bus form, simplifies automotive wire bundle, strengthens controllable function, improves safety assurance, message reflection is complete, and antijamming capability is strong.Wherein the CAN bus in the utility model adopts common mode inductance to isolate, and prevents the irrecoverable property destruction of CAN treatment circuit, and CAN bus itself has high anti-electromagnetic interference in addition, speed is fast, distance, the data error rate is extremely low, priority is set satisfies characteristics such as different real-times.

Information interaction in the utility model is not only just accepted the CAN bus data and is presented in the instrument, but also is the acquisition volume of signal feedback CAN information the time.Such as coolant-temperature gage, information such as the speed of a motor vehicle are exported by the PWM/ frequency division module all from the CAN bus data.Brake troubles in addition, air-conditioning A/C request, four wheel drive locking information is responsible for gathering by the utility model and is passed to cooresponding electric stabilizing system (ESC), engine management system (EMS), transmission control system (TCCU) by CAN then.

Description of drawings

Fig. 1 is the modular construction scheme drawing of the utility model preferred embodiment;

Fig. 2 is the processing module circuit diagram 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 assembly and the switching value module circuit diagram of the utility model preferred embodiment;

Fig. 5 is the PWM/ frequency division module circuit diagram of the utility model preferred embodiment;

Fig. 6 is the gauge outfit module circuit diagram of the utility model preferred embodiment;

Fig. 7 is the indicator light circuit figure of the utility model preferred embodiment;

Fig. 8 is the buzzer circuit figure of the utility model preferred embodiment;

Fig. 9 is the displacement output module circuit diagram of the utility model preferred embodiment;

Figure 10 is the Liquid Crystal Module circuit diagram of the utility model preferred embodiment;

Figure 11 is the power module circuitry figure of the utility model preferred embodiment;

Figure 12 is the RTC module circuit diagram of the utility model preferred embodiment;

Figure 13 is the interface module circuit diagram of the utility model preferred embodiment;

Figure 14 is the instrument backlight module circuit diagram of the utility model preferred embodiment;

Figure 15 is the zero key circuit figure that returns of the utility model preferred embodiment;

Figure 16 is the debug port circuit diagram of the utility model preferred embodiment.

The specific embodiment

As shown in Figure 1, the utility model preferred embodiment comprises processing module 1, CAN BUS module (CAN bus module) 2, sensor assembly 3, switching value module 4, displacement output module 5, PWM (pulse width modulation)/frequency division module 6, gauge outfit module 7, Liquid Crystal Module 8, alarm module 9, interface module 10, power module 11, RTC module 12, instrument backlight module 13.

The micro controller system that is adopted in the processing unit 1 is the H8S2282 chip that the auspicious Sa science and technology of renesas is produced, this chip is 16 automotive grade micro controller systems of peripheral functions such as band CAN treater, the output of PWM/ frequency division, 10 A/D, lcd controller, and its peripheral junction circuit as shown in Figure 2.

Wherein, 86 pin HRXD in the H8S2282 chip are connected CAN BUS module 2 with 87 pin HTXD.The concrete connection of CAN BUS module 2 comprises CAN interface chip 21, common mode inductance transient suppressor 22, terminal resistance 23 and filter circuit 24 compositions as shown in Figure 3.

The model that CAN interface chip 21 adopts is TJA1050T, and 7 pin CANH of this TJA1050T chip are connected common mode inductance transient suppressor 22 with 6 pin CANL, are used to filter common-mode point interfering signal herein.Also be connected with filter circuit 24 and terminal resistance on the input end of common mode inductance transient suppressor 22, filter circuit 24 is that the common anode of rectifier diode 2D1 and 2D2 is connected to form, and circuit is carried out rectification.Terminal resistance is that resistance 2R1 and the 2R2 series connection among Fig. 3 forms, and has the signal reflex of elimination in communication cable, provides the CAN terminal to determine the effect of level.

The acquisition module that sensor assembly 3 and switching value module 4 form in the utility model as shown in Figure 4, is mainly gathered all kinds of vehicle signals.Have fuel sensor 31, evaporator temperature sensor 32, environment temperature sensor 33 in the sensor assembly 3.Have air-conditioning A/C request collecting unit 41, brake troubles collecting unit 42 and four wheel drive locking collecting unit 43 in the switching value module 4.The Acquisition Circuit of sensor assembly 3 and switching value module 4 signals is the signal processing circuit of auto electric.

Wherein, fuel sensor 31, brake troubles collecting unit 42 and four wheel drive locking collecting unit 43 are connected on the analog quantity input pin on the H8S2282 chip, be connected to 88 pins, 94 pins, 93 pins of H8S2282 chip in the present embodiment, air-conditioning A/C request collecting unit 41 is connected 79 pins, 94 pins, 93 pins of H8S2282 chip, and evaporator temperature sensor 32, environment temperature sensor 33 are connected to 57,58 pins on the H8S2282 chip.

PWM/ frequency division module 6 comprises speed of a motor vehicle frequency division output unit 61 and water temperature PWM output unit 62 as shown in Figure 5, and wherein speed of a motor vehicle frequency division is 1 frequency division.The speed of a motor vehicle that from the CAN bus, obtains, water temperature signal, after the micro controller system processing, output from PWM/ frequency division module 6.

Gauge outfit module 7 figure are four stepping motors that are connected H8S2282 chip pulse output end shown in 6, comprise mileage, rotating speed, fuel oil and water temperature, and stepping motor output is the rotation of four dial plate pointers of dial plate in the control instrument.

Have lcd controller in the H8S2282 chip, Liquid Crystal Module 8 direct connections drive on the pin at LCD.Liquid Crystal Module 8 adopts the HT1621B lcd drive chip as shown in figure 10, and liquid crystal chip YJ-ZB155F4.

Alarm module 9 in the present embodiment mainly contains two kinds of structures, and a kind of is indicator light circuit 91 shown in Figure 7, and a kind of is buzzer circuit 92 shown in Figure 8.Wherein a part is the rigid line direct control of drawing on the automobile in the indicator light circuit 91, such as safety air bag report to the police, engine oil pressure low reports to the police, left steering, right steering, adverse-weather lamp, fog tail lamp, passing light, country beam, PAGOFF (baggage container is closed), safety strap, antitheft, servo-steering, braking during standstill, charging indication etc.A part is reported to the police according to switching value that collects and CAN data direct or indirect (by displacement output) control indicator lamp by micro controller system in addition.Buzzer circuit 92 is that direct connection is in the H8S2282 chip on the 80 buzzer phone output pins.

What a part was reported to the police by displacement output control indicator lamp in above-mentioned is to realize by displacement output module 5, comprises fuel oil warning, water temperature warning, four wheel drive locking, ABS (braking anti-lock), oil separation, 4WD fault (4 wheel driven fault), ESP fault (the steady system failure of automatically controlled form), ESP work, mounted automatic diagnosis, brake troubles, engine preheating, cruises, engine breakdown etc.As shown in Figure 9, displacement output module 5 is to be composed in series by two parallel port pio chip CD4094, forms 16 parallel port outputs.

Power module 11 comprises voltage stabilizing processing unit 111 and externally fed unit 112 as shown in figure 11.Voltage stabilizing processing unit 111 adopts the voltage stabilizing of LM317T three-terminal regulator block that ignition tension or battery tension are carried out the voltage stabilizing processing, obtains the power supply voltage VCC of system.In addition, externally fed unit 112 is to export from 78 externally fed pins of H8S2282 chip, for buzzer circuit 92 provides power supply.

RTC module 12 is to adopt the performance-oriented PCF8563RTC chip in Philip, by I2C interface and the connection of 61,62 pins on the H8S2282 chip of RTC, for the present embodiment clock accurately calculates, referring to Figure 12.

Interface module 10 comprises two chips of interface A, B as shown in figure 13, provides auto meter required various signals.Such as the signal that attracts from rigid line in the alarm module 9 is exactly by access the interface module 10, and also having the signal of gathering in sensor assembly 3 and the switching value module 4 also is to introduce by interface module 10.

Instrument backlight module 13 as shown in figure 14, backlight is provided by 15 pins of the interface A in the interface module 10.

In addition, also be furnished with back zero key (as Figure 15) and debug port (as Figure 16) in the present embodiment, return zero key and be connected 95 pins on the H8S2282 chip, speedometer for automobile is carried out subtotal zero clearing and timing.The debug port simulation provides instrument pulse, analog quantity, CAN signal, realizes the function to the various signal debugging of instrument.The H8S2282 chip carries out the switching of normal mode of operation and program downloading mode with two dial-up modes in the present embodiment, and the program download function merges on the debug port of tune-up tester.

The utility model is when work, and the gear information of the startup of cruising of automobile EMS, vehicle speed signal, water temperature and instantaneous oil consumption, TCCU, the vehicle speed signal of ESC are all passed through input in the CAN BUS module 2.Wherein the speed of a motor vehicle of automobile, water temperature signal are handled at last by 6 outputs of PWM/ frequency division module through the H8S2282 chip.

And the utility model itself also has acquisition module, carry out active collection by

sensor assembly

3 and 4 pairs of fuel oil signals of switching value module, evaporator temperature signal, ambient temperature signal, air-conditioning A/C request signal, brake troubles signal and four wheel drive locking signal, send the cooresponding electric stabilizing system of automobile (ESC), engine management system (EMS), transmission control system (TCCU) to by CAN BUS module 2 then.

In addition, the utility model also has perfect alarm module, can directly report to the police to the signal that the automobile rigid line is drawn, and also can report to the police to the signal after handling through micro controller system.

Claims

1. based on the auto meter of CAN bus, it is characterized in that: comprise processing unit, CANBUS module, acquisition module, displacement output module, PWM/ frequency division module, gauge outfit module, Liquid Crystal Module; The data transmit-receive end of CAN BUS module connection processing unit, the collection module is connected the processing unit input end, the displacement output module is connected the mouth of processing unit, the PWM/ frequency division module is connected the mouth of processing unit, the pulse output end of gauge outfit module connection processing unit, Liquid Crystal Module is connected on the liquid crystal drive end of processing unit.

2. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: described processing unit adopts auspicious Sa science and technology H8S2282 chip.

3. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: described gauge outfit module comprises that mileage, rotating speed, fuel oil and four of water temperatures are used for the stepping motor of control instrument pointer.

4. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: the externally fed end of described processing unit connects power module.

5. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: described interface module connects auto meter and other electric components of automobile, transmission auto meter various signals to be expressed.

6. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: described acquisition module comprises sensor assembly and switching value module, and sensor assembly comprises fuel sensor, evaporator temperature sensor, environment temperature sensor; The switching value module comprises air-conditioning A/C request collecting unit, brake troubles collecting unit and four wheel drive locking collecting unit.

7. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: described CAN BUS module comprises CAN interface chip, common mode inductance transient suppressor, terminal resistance and filter circuit composition; The input end of CAN interface chip connects the common mode inductance transient suppressor successively, eliminates terminal resistance, the filter circuit of signal reflex in the communication cable, and the mouth of CAN interface chip is connected to the input end of processing unit.

8. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: the RTC module of described processing unit adopts the PCF8563 of PHILIPS Co. chip.

9. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: described displacement output module comprises that two parallel port pio chip CD4094 are composed in series, and mouth is connected with the auto meter warning circuit; The PWM/ frequency division module comprises output of speed of a motor vehicle frequency division and water temperature PWM output.

10. the auto meter based on the CAN bus as claimed in claim 1 is characterized in that: described processing unit also is connected with back zero key and debug port.