CN201897826U

CN201897826U - Vehicle-mounted information recording instrument with Micro SD (secure digital) card memory interface

Info

Publication number: CN201897826U
Application number: CN2010205014900U
Authority: CN
Inventors: 张洪燕; 金黎杰
Original assignee: Shanghai Zhongke Shenjiang Electric Vehicle Co Ltd
Current assignee: Shanghai Zhongke Shenjiang Electric Vehicle Co Ltd
Priority date: 2010-08-24
Filing date: 2010-08-24
Publication date: 2011-07-13
Anticipated expiration: 2020-08-24

Abstract

The utility model discloses a vehicle-mounted information recording instrument with a Micro SD (secure digital) card memory interface, which comprises a singlechip, a bus interface, a Micro SD card, an indication LED (light-emitting diode), a ferroelectric memory and a button battery, wherein the bus interface comprises a CAN (controller area network) bus interface, a synchronous SPI (serial peripheral interface) bus interface, an asynchronous SCI (serial communication interface) bus interface, and a USB (universal serial bus) interface. The singlechip is connected with a whole vehicle CAN network through a CAN module circuit, namely a node is added to the whole vehicle CAN network; and the singlechip is connected with the Micro SD card through an SPI bus interface. The singlechip is connected with the whole vehicle CAN network through the CAN module circuit, namely a node is added to the whole vehicle CAN network to realize the collection and analysis of various data. The singlechip is connected with the Micro SD card through the SPI bus interface, therefore, the required driving data can be recorded in the Micro SD card according to a certain time interval.

Description

On-vehicle information registering instrument with Micro SD card memory interface

Technical field

The utility model relates to a kind of on-vehicle information registering instrument, relates to a kind of on-vehicle information registering instrument of the Micro of having SD card memory interface especially, the running data that it can the real time record electric vehicle, and can offline access.

Background technology

Micro SD card claims the T-Flash card again, full name: TransFLash, research and develop jointly by Motorola and SANDISK, and released in 2004.Product design adopts the SD architecture design to form, it is a kind of microminiature card (15mm*11mm*1mm), be about 1/4 of SD card, it is mainly used in mobile phone, but the continuous lifting of small because of its volume in storage volume has been used in GPS equipment, portable music player and some the flash memory dishes now.Current Micro SD card provides the capacity of 128MB, 256MB, 512MB, 1G, 2G, 4G, 8G, 16G and 32G.Micro SD card can be behind the SD ticket converter, when the SD card uses.Present nearly all notebook computer all has the SD draw-in groove, can directly read the data message in the SD card.

CAN is the abbreviation (hereinafter referred to as CAN) of ControllerAreaNetwork, is to solve a kind of serial data communication agreement that control numerous the Hyundai Motor and the exchanges data between the testing tool are developed by German BOSCH company from the beginning of the eighties.Be one of most widely used fieldbus in the world at present.Be widely used in aspects such as industrial automation, boats and ships, Medical Devices, commercial unit.In current automobile industry,, make that the CAN bus is more and more outstanding in aspect effects such as vehicular data acquisition and fault diagnosises for to security, comfortableness, convenience, low public hazards, requirement cheaply.

USB is the abbreviation of English Universal Serial BUS (USB (universal serial bus)), is used for being connected and communication of standard computer and external unit.The plug and play of USB interface support equipment and hot plug function.USB will unite proposition in the end of the year 1994 by many companies such as Intel, Compaq, IBM, Microsoft.USB interface has become the standard interface of computing machine now.

The on-vehicle information registering instrument mainly writes down electric vehicle driving data, and it can preserve the various information in the vehicle operating process.Such as battery electric quantity SOC, cell voltage, Electric Machine Control actuator temperature, gear information, failure code or the like.At present the vehicle-mounted CAN network is very universal, and the car load Control Network of electric vehicle especially needs CAN to coordinate data with processing motor controller, entire car controller and battery management system etc.Now the railway air line all has monitoring record instrument separately, is commonly called as black box, and electric automobile is as new environment-friendly products, and reliability requirement higher also needs such registering instrument naturally.Vehicle is not mostly installed such product at present.Need the very big work of expense investigation when breaking down or after breaking down, also can't reduce on-site situation.For technical Analysis provides suitable difficulty.

Summary of the invention

The purpose of this utility model is to have overcome deficiency of the prior art, and a kind of on-vehicle information registering instrument of electric vehicles is provided.This registering instrument both can realize the CAN bus signals with the car record, can be connected to computing machine by SD draw-in groove or USB interface again and carry out offline access and information analysis.

For achieving the above object, the utility model is taked following technical scheme: have the on-vehicle information registering instrument of Micro SD card memory interface, it is characterized in that: it comprises single-chip microcomputer, bus interface, Micro SD card, indication LED, ferroelectric memory (hereinafter to be referred as FRAM) and button cell.Described bus interface comprises CAN bus interface, synchronous serial external apparatus interface (hereinafter to be referred as the spi bus interface), asynchronous serial communication interface (hereinafter to be referred as the SCI bus interface) and usb bus interface.Single-chip microcomputer is connected with indication LED, and single-chip microcomputer is connected with ferroelectric memory, and single-chip microcomputer is connected with button cell, and single-chip microcomputer is by bus interface and Micro SD card connection.Single-chip microcomputer links to each other with car load CAN network by the CAN modular circuit, and being equivalent to car load CAN network increases a node, realizes the collection and the parsing of various data.Single-chip microcomputer sticks into row by spi bus interface and Micro SD and is connected, and the driving data of needs are recorded in the Micro SD card by certain time interval.FRAM and button cell can provide real-time clock (hereinafter to be referred as RTC) for registering instrument.

Product described in the utility model is applicable to various vehicles, especially with the electric vehicle of CAN bus.The data volume that this registering instrument can write down is big, and can select the information that writes down as required, can write down BMS, and the inner parameter of MCU dispatch control system and the real-time time when breaking down can help accurately to locate driving faults like this.

Description of drawings

Fig. 1 is a structured flowchart of the present utility model.

Fig. 2 is a network communication synoptic diagram of the present utility model.

Fig. 3 is a software flow pattern of the present utility model.

Wherein VCU is an entire car controller, and MCU is an electric machine controller, and BMS is a battery management system.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

As shown in Figure 1, single-chip microcomputer (selecting the S9S08DZ32 processor for use) connects CAN driver element circuit, and CAN driver element circuit (selecting the CTM8251 chip for use) inserts the CAN network of car load, and being equivalent to car load increases a node, as shown in Figure 2.Single-chip microcomputer also connects the SPI interface circuit, sticks into the line data exchange by spi bus and Micro SD.Single-chip microcomputer also is connected to usb circuit (selecting the CP2101 chip for use), realizes SCI bus commentaries on classics USB, carries out data communication with computer.Single-chip microcomputer also is circumscribed with storage unit circuit (selecting the FM3316-G chip for use), and the characteristic that this ferroelectric memory outage is difficult for losing can be for providing backup after the on-vehicle information registering instrument abnormal power-down.After powering on, vehicle the data extract in the storer can be come out unloading in Micro SD card.Be connected to the level conversion unit circuit between single-chip microcomputer and the storage unit circuit.

Single-chip microcomputer receives the car load data by car load CAN network real-time, selects the parsing and the conversion of data as required.After data-switching success and the packing,, realize the storage of data by spi bus and based on FAT32 file system read-write Micro SD card.Constantly in the storage unit that extends out, write down on-vehicle information by spi bus simultaneously, so that the data during abnormal power-down are recovered.The timing that produces according to single-chip microcomputer during recorded information is interrupted, and sends the content of a sector every 3s in Micro SD card, and sevtor address increases progressively then, and after the full file size of presetting of record, the file sectors address is made as initial address again.When continuing the record on-vehicle information, cover record the earliest automatically.Because include the real-time clock that the storage unit chip provides during the on-vehicle information record, the computer expert can know the time that these information take place when crossing reading of SD card or USB interface realization data.

Totally 4 of on-vehicle information registering instrument indication LED comprise power supply indication (green), and car load CAN information indication (redness) is accepted in the single-chip microcomputer circulation, SD card initialization success (redness), file logging success (redness).Data record format can define voluntarily, comprises name of the information, the information content and separator.

Claims

1. on-vehicle information registering instrument with Micro SD card memory interface, it comprises single-chip microcomputer, bus interface, Micro SD card, indication LED, ferroelectric memory and button cell, wherein single-chip microcomputer is by bus interface and Micro SD card connection, single-chip microcomputer is connected with indication LED, single-chip microcomputer is connected with ferroelectric memory, and single-chip microcomputer is connected with button cell.

2. the registering instrument described in the claim 1, wherein said bus interface comprises CAN bus interface, synchronous serial external apparatus interface, asynchronous serial communication interface and usb bus interface.

3. according to the on-vehicle information registering instrument described in claim 1 or 2, it is characterized in that single-chip microcomputer passes through the CAN modular circuit and links to each other with car load CAN network, single-chip microcomputer sticks into row by the synchronous serial external apparatus interface with Micro SD and is connected.