CN201107726Y

CN201107726Y - Digital type automobile instrument system

Info

Publication number: CN201107726Y
Application number: CNU2007200461766U
Authority: CN
Inventors: 郑强; 邓军
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2007-09-14
Filing date: 2007-09-14
Publication date: 2008-08-27
Anticipated expiration: 2017-09-14

Abstract

The utility model relates to a digital motormeter system which is characterized in that a whole CAN communication network that consists of a microcontroller and an LCD screen that is used for displaying tested signals, such as the driving speed, the rotating speed, the fuel and the water temperature are arranged. The CAN communication network outputs the tested digital signals to the microcontroller by two signal connecting lines; after being compared and treated by the microcontroller, the signals are output to the buffer of a drive and then the drive outputs the real-time signals to the LCD screen. The digital motormeter system greatly simplifies the system formation and the system connecting lines. The signals, comprising the driving speed, the rotating speed, the fuel and the water temperature, can be accurately and directly displayed in the LCD display screen.

Description

The digital automobile instrument system

Technical field

The utility model relates to automobile instrument system, the digital automobile instrument system of more specifically saying so.

Background technology

The instrument that generally adopts on the current automobile is a pointer-type, comprises speedometer, tachometer gage, fuel gauge, water-thermometer, accumulative mileage table, subtotal mileometer and clock etc.The demonstration of pointer instrument is after converting digital signal to by simulating signal that will collect or frequency signal, again digital signal is converted to the pulse signal of drive stepping motor running, the speed of a motor vehicle that it reflects or change in rotational speed often do not satisfy the requirements at the higher level of driver to the speed of a motor vehicle or rotating speed real-time change; There are the following problems for this meter type:

1, form is single, the structural limitations of stepper motor and pointer freely designing of instrument profile;

2, often need to design comparatively complicated light guide structure and come for gauge pointer and show board illumination is provided, thereby increased the weight of instrument.

3, each instrument signal wire independently separately makes the total system wire harness complexity of arranging, and all brings difficulty for design, I﹠ M.

4, along with the development of new auto technology, the Electronic Control degree of automobile requires more and more higher, increasing signal will be required to show on instrument, along with and the increasing of wire harness that come will make system design complicated more, and greatly limited the realization of instrument system function to a great extent.

The utility model content

The utility model is for avoiding above-mentioned existing in prior technology weak point, a kind of digital automobile instrument system is provided, constitute, reduce system's line in the hope of simplifying system, make and comprise the speed of a motor vehicle, rotating speed, amount of fuel, water temperature and clock interior multiple signal can be in real time, the mode with the LCD liquid crystal display intuitively shows exactly.

The utility model technical solution problem adopts following technical scheme:

Design feature of the present utility model is the car load CAN communication network that is made of single-chip microcomputer to be set and to be used to show the LCD LCDs that comprises the speed of a motor vehicle, rotating speed, fuel oil and each measured signal of water temperature, described CAN communication network inputs to single-chip microcomputer with two signal links with described measured number signal, buffer zone input to driver after the comparison process of single-chip microcomputer exports the LCD LCDs in real time by driver then.

Design feature of the present utility model also is:

Adopt the NEC D78F0828A single-chip microcomputer of integrated CAN communication function, be equipped with two drivers with 40 section outputs and 4 backplane output driving segmentation LCDs, the SDA of described driver and SCL end pin connect single-chip microcomputer, and output of driver section and backplane output connect LCD display.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

1, the utility model adopts the mode of CAN communication to carry out the signal transmission, system only increases by two wire harness, the multiple function of except alarm lamp other such as the speed of a motor vehicle, rotating speed, fuel oil, water temperature etc. all centralized displaying have simplified system's formation greatly in the LCD LCDs, the quantity of information that the increase system shows, the requirement that more and more signal demands that the raising of feasible development for the adaptation new auto technology, Vehicle Electronic Control degree brings thereupon carry out the instrument demonstration provides good technical guarantee.

2, compare with pointer automobile instrument, the utility model has been cancelled stepper motor and pointer, and the design of leaded light support also can be simpler, alleviated the overall weight of instrument greatly, and the design of instrument appearance and modeling has bigger performance leeway.

3, the utility model adopts the centralized displaying mode of LCD LCDs, can fully satisfy human pilot to information such as the speed of a motor vehicle fast, reading requirement intuitively, display mode is novel directly perceived; Adopt liquid crystal display also to greatly reduce power consumption.

Description of drawings

Fig. 1 is the utility model system chart.

Fig. 2 is the interface circuit schematic diagram of the utility model driver and single-chip microcomputer and LCD LCDs.

Fig. 3 is the utility model display structure synoptic diagram.

Label among Fig. 3: frame, 6 glass face shields before 1 drain pan, 2 printed circuit board (PCB)s, 3 leaded light supports and table board, the 4 large-scale LCD LCDs, 5.

Below, in conjunction with the accompanying drawings the utility model is further described by embodiment:

Embodiment

Referring to Fig. 1, the car load CAN communication network that setting is made of single-chip microcomputer and be used to show the LCD LCDs that comprises the speed of a motor vehicle, rotating speed, fuel oil and each measured signal of water temperature, the CAN communication network inputs to single-chip microcomputer with two signal links with described measured number signal, buffer zone input to driver after the comparison process of single-chip microcomputer exports the LCD LCDs in real time by driver then.

Principle of work:

The speed of a motor vehicle, CAN information such as rotating speed are by carrying out the CAN communication receiving/transmission device reception that communication is connected with car load, and the signal that receive to need by Single-chip Controlling, be responsible for handling to the received signal by single-chip microcomputer then, judge, and compare, if data have renewal with data in the internal memory, then new data are sent to the display buffer of LCD driver, drive LCDs by LCD driver at last up-to-date information is shown.

Referring to Fig. 2, single-chip microcomputer and CAN communication receiving/transmission device adopt the NEC D78F0828A single-chip microcomputer of integrated CAN communication function.The process that the ISG automobile instrument receives CAN information is, at first distribute address of automobile instrument by car load CAN communication network, and the data layout of definition car load communication, after communication connects normally, after connecting accumulator electricity and Ignition on point thermoelectricity for the ISG automobile instrument, single-chip microcomputer is started working, at first control the data on the CAN communication receiving/transmission device reception CAN that is integrated in single-chip microcomputer inside, then the CAN information that receives is decoded according to CAN agreement predetermined data coded format, the speed of a motor vehicle that the data-switching that CAN Frame the inside is transmitted becomes the ISG automobile instrument to need, information such as rotating speed also preserve.

LCD driver adopts two driver Philips PCF8576DT with 40 section outputs and 4 backplane output driving segmentation LCDs.PCF8576DT has static state, 1: 2,1: 3 and 1: 4 four kinds of backplane way of output.After the output of data such as the speed of a motor vehicle that will show, rotating speed sent PCF8576DT to, PCF8576DT was filled in the byte data that receives in the display random access memory according to selected LCD type of drive, and is presented on the large-sized liquid crystal display.

Referring to Fig. 3, concrete display structure is made up of drain pan 1, printed circuit board (PCB) 2, leaded light support and table board 3, large-scale LCD LCDs 4, preceding frame 5 and glass face shield 6, owing to used the large-scale LCD LCDs, only need light the LED lamp that is arranged on the printed circuit board (PCB) 2 just can reach good illuminating effect for it, thereby the illumination of having saved to traditional pointer and table board designs the leaded light support separately, and large-scale LCD LCDs and support are fixed by welding on the printed-wiring board (PWB).The utility model display structure simplicity of design is used between each parts to be clasped, and does not need screw to install.

Relevant in concrete the enforcement be provided with can for:

1, the speed of a motor vehicle shows

In the centre of large-sized liquid crystal display with white totally 21 pen sections show the speed of a motor vehicle, indication range 0～999 km/hour, and speed of a motor vehicle unit " km/h ".When the speed of a motor vehicle changes, by single-chip microcomputer vehicle speed signal to be delivered in the buffer zone of driver after relatively, pen section corresponding on the LCD LCDs will be lighted; Display effect novelty, directly perceived.

2, rotating speed shows

In the high order end green of large-sized liquid crystal display, blueness, totally 34 pen sections of red three kinds of colors show engine speed.Wherein change 0～1000 and divide 10 sections, be green pen section, every segment table shows 100 rev/mins; Changeing above per 1000 1000 changes and is divided into 4 sections, and every segment table shows 250 rev/mins, wherein transfers green pen section to from 1000～4000, transfers the blue pen section to from 4000～6500, transfers red pen section to from 6500～7000.When rotating speed changes, by single-chip microcomputer tach signal to be delivered in the buffer zone of driver after relatively, the pen section of corresponding color will be lighted on the LCD LCDs;

3, amount of fuel shows

With green, what of amount of fuel are totally 20 pen sections of red 2 kinds of colors show at the low order end of large-sized liquid crystal display.Wherein from the alarm set point to E, divide 10 sections demonstrations, be red pen section; Alarm set point divides 10 sections demonstrations to full oil level F, is green pen section.When amount of fuel changes, to deliver in the buffer zone of driver after by single-chip microcomputer the fuel oil signal being handled, the pen section of corresponding color will be lighted on the LCD LCDs;

4, water temperature shows

In the right-hand member green of large-sized liquid crystal display, blueness, red 3 kinds of colors totally 10 pen sections show engine coolant temperature, and wherein high temperature alarm shows with a section of redness.When water temperature changes, by single-chip microcomputer water temperature signal to be delivered in the buffer zone of driver after relatively, the pen section of corresponding color will be lighted on the LCD LCDs;

Relevant displaying contents can also comprise: mileage, mileage subtotal, oil consumption, car door are opened demonstration.At the specific vehicle of ISG hybrid vehicle, its displaying contents can comprise that also charging/power-assisted state, ISG automatic stopping idling, accumulator dump energy account for the number percent of total electric weight, and function such as automatic gear-box demonstration, the demonstration of radar for backing car spacing.

Claims

1, digital automobile instrument system, it is characterized in that being provided with the car load CAN communication network that constitutes by single-chip microcomputer and be used to show the LCD LCDs that comprises the speed of a motor vehicle, rotating speed, fuel oil and each measured signal of water temperature, described CAN communication network inputs to single-chip microcomputer with two signal links with described measured number signal, buffer zone input to driver after the comparison process of single-chip microcomputer exports the LCD LCDs in real time by driver then.

2, digital automobile instrument system according to claim 1, it is characterized in that adopting the NECD78F0828A single-chip microcomputer of integrated CAN communication function, be equipped with two drivers with 40 section outputs and 4 backplane output driving segmentation LCDs, the SDA of described driver and SCL end pin connect single-chip microcomputer, and output of driver section and backplane output connect LCD display.

3, digital automobile instrument system according to claim 2, a segment layout that it is characterized in that described display screen are to show the speed of a motor vehicle with 21 pen sections; Show engine speed with 34 pen sections; Show amount of fuel with 20 pen sections; Show engine coolant temperature with 10 pen sections.