CN202243022U

CN202243022U - Miniature instrument system of vehicle

Info

Publication number: CN202243022U
Application number: CN2011202974838U
Authority: CN
Inventors: 覃晓昌; 李宝泳; 王凌志; 林加伟
Original assignee: Huizhou Desay SV Automotive Co Ltd
Current assignee: Huizhou Desay SV Automotive Co Ltd
Priority date: 2011-08-16
Filing date: 2011-08-16
Publication date: 2012-05-30
Anticipated expiration: 2021-08-16

Abstract

The utility model relates to a miniature instrument system of a vehicle, which comprises an MCU (microprogrammed control unit) master control chip, a signal input module, a scale driving module, an LCD (liquid crystal display) module and a detecting module. The signal input module, the scale driving module, the LCD module and the detecting module are connected with the MCU master control chip, the detecting module is used for detecting the temperature of the MCU master control chip and further provides frequency correction parameters for an MCU, the MCU master control chip is an intelligent chip which is provided with an internal crystal oscillator and has an LCD driving function, and the signal input module consists of a rotation speed signal input unit, a vehicle speed signal input unit, a fuel signal input unit and a coolant signal input unit. Devices such as an external crystal oscillator, a memory, a display chip and the like of an original instrument system are omitted, the intelligent chip with all the functions is used as a core of the system, and cost of the miniature instrument system is lowered without reducing various functions of the original system on the basis that quality performance indexes of an automobile product are guaranteed.

Description

A kind of little car meter system

Technical field

The utility model relates to the automobile instrument system design, specifically is meant a kind of meter system that is applicable to minicar.

Background technology

The system design of existing combination instrument; With microcontroller unit MCU is core; With external crystal-controlled oscillation as signal source of clock; In order to handle from the numeral on the car, analog signal, bus communication signal, drive motor carries out the running of scale, and the general programmable IO port GPIO through MCU removes to drive corresponding alarm lamp and drives the demonstration that LCD carries out relevant vehicle body information through display driver chip.Scale is that MCU realizes through pulse-width modulation PWM mode drive stepping motor; And some information of vehicle body (total kilometrage; Service cycle etc.) just be kept among the exterior electricallyerasable ROM (EEROM) EEPROM; At last, auto meter generally all has the function of real-time clock RTC, and this function generally also need utilize exterior crystal oscillator to realize as the clock source.The system schema of general auto meter can be with reference to Fig. 1, and its peripheral components is more, and cost is also higher.But for minicar, also less relatively on the function because the minicar instrument is relatively simple for structure, so also corresponding requirements step-down of the cost of development of the instrument of minicar.So, satisfy client's price request and increase self benefit, just must have low cost, quality and a performance can both satisfy the auto meter platform of client's standard.

Summary of the invention

The utility model technical matters to be solved provides the superior relatively but lower-cost automobile instrument system of a mass and performance.

For solving the problems of the technologies described above; The utility model adopts following technical scheme to realize: a kind of little car meter system; Comprise MCU main control chip and connected signal input module, scale driver module, LCD display module; Said MCU main control chip adopts the intelligent chip that has inner crystal oscillator and flash and have LCD display driver function; Also comprise and be used to detect MCU main control chip temperature and then for MCU provides the detection module of frequency correction parameter, this detection module mouth connects the MCU main control chip.

Said little car meter system also comprises the warning indicator lamp with MCU main control chip bonded assembly LED.

Said MCU main control chip is reserved inner crystal oscillator frequency output port.

Said signal input module comprises tach signal input block, GES input block, fuel oil signal input unit, refrigerant fluid signal input unit.

Compared with prior art; The utility model has been cancelled the external crystal-controlled oscillation, memory device, display chip of original meter system or the like device; The intelligent chip that adopts above-mentioned functions integrated is as the system core; Do not reduce original system each item function but reduce system cost, guaranteed on the basis of vehicle product quality performance figure.

Description of drawings

The existing little car meter system of Fig. 1 is formed structural representation;

The said little car meter system of Fig. 2 the utility model is formed structural representation.

The specific embodiment

Below will combine accompanying drawing and embodiment that the utility model is explained in further detail for the ease of it will be appreciated by those skilled in the art that.

Little car meter system that the utility model disclosed; Comprise MCU main control chip and signal input module, scale driver module, LCD display module, LED warning indicator lamp and voice guard, be used to detect the detection module of MCU main control chip temperature, above-mentioned module all is connected with the MCU main control chip.Wherein, signal input module comprises tach signal input block, GES input block, fuel oil signal input unit, refrigerant fluid signal input unit.

Said MCU main control chip adopts the intelligent chip that has inner crystal oscillator and flash and have LCD display driver function, and MCU also reserves inner crystal oscillator frequency output port.MCU utilizes inner flash to simulate EEPROM and stores data like this, and under various abnormal condition, such as situation such as power down suddenly or spread of voltages, this flash provides the active data restorability, has guaranteed data security.Simultaneously, the driver module that MCU inside carries, but direct drive LCD display owing to be directly the home address of MCU to be operated, need do not pass through universal serial bus and carry out data transmission, and the information of demonstration is more timely, does not have to postpone.

The scale driver module of the utility model only adopts a stepping motor and a scale; Cancelled after one or several scales in the former meter system; Show the demonstration that increases corresponding information at LCD; And increase the LED warning indicator lamp, and drive complicated scale number thereby reduced, reducing can not appear in the information that instrument can be pointed out yet.

For the cancellation external clock; Adopt internal clocking the situation of timing error can occur, under the normal temperature, a port is set on MCU; When letting this port get into factory test mode in the software design, export inner crystal oscillator frequency; Producers can be stored in frequency values among the inner flash (EEPROM), so when entering into normal operation mode according to the mode that defines in advance through bus after measuring this frequency with outside precision instrument; Program can obtain real frequency values earlier from EEPROM, obtain correct clocking value and frequency etc. through suitable frequency correction algorithm then.Simultaneously, on bus communication, can increase the corresponding communication correct algorithm of makeing mistakes according to the extent of deviation of frequency, accurate to guarantee data transmission.

Simultaneously, the thermally dependent resistor of periphery increase at MCU is used for test MCU temperature under non-normal temperature, and this temperature information feeds back among the MCU, cooperates the temperature curve of MCU crystal oscillator again, it is further revised, with clocking value and the frequency values that obtains wanting.

When doing RTC clock source with inner crystal oscillator; Can be in suitable interrupt source period of the inner selection of MCU; When producing interruption, again according on software, designing a rational timing algorithm period, in conjunction with the top frequency correction way of being mentioned; Just can proofread and correct clock accuracy more accurately, thereby guarantee the particularity of real-time clock.

The foregoing description is the preferred version that the utility model is realized; And indefiniteness is exhaustive; The utility model can also have other variations under same idea; Need to prove that do not breaking away under the utility model design prerequisite, any conspicuous replacement and subtle change are all within the protection domain of the utility model.

Claims

1. little car meter system; Comprise MCU main control chip and connected signal input module, scale driver module, LCD display module; It is characterized in that: said MCU main control chip adopts the intelligent chip that has inner crystal oscillator and flash and have LCD display driver function; Also comprise and be used to detect MCU main control chip temperature and then for MCU provides the detection module of frequency correction parameter, this detection module mouth connects the MCU main control chip.

2. little car meter system according to claim 1 is characterized in that: also comprise the warning indicator lamp with MCU main control chip bonded assembly LED.

3. little car meter system according to claim 2 is characterized in that: said MCU main control chip is reserved inner crystal oscillator frequency output port.

4. little car meter system according to claim 3 is characterized in that: said signal input module comprises tach signal input block, GES input block, fuel oil signal input unit, refrigerant fluid signal input unit.