Hardware Design Of Electronic Controlling System Of Diesel

BACKGROUNDThe degree of using electronic has already been regarded as the importantsign of weighing the level of a national auto industry. Abroad, the electronicdevice on each car accounts for 20%-25% of the completed car cost on average,electronics industry is in the automobile unprecedented developing period. Athome, though some electronic products are equipped on the car, are all theproducts that foreign side's related manufacturers offered, let alone commercialtruck, scarcely equips the electronic product. Auto industry pillar industry, we ofnational economy, automobile electronic product occupy heavy proportion veryamong the production cost in automobile. The automobile electron is a high-techproduct, the profit rate is high, develop the electronic industry of the automobile,can create the considerable economic benefit, will offer more employmentopportunities at the same time.Develop the developing platform of embedded software facing automobileelectron, can shorten the electronic product development period of domesticautomobile greatly , raise the putting in an position rate of software code ofelectronic product of automobile, save the electronic product development cost ofthe automobile, improve the cost performance of the products, form a newenormous market.SYSTEM OVERVIEWBy the technique center of the First Automobile Factory of China, Jilinuniversity ," embedded software platform project of supporting the automobileelectron " which Zhejiang University three sides jointly develops, become to acton one's own the domestic demand electronic control system always to of ourcountry automobile electronic automobile power of field, develop one faceautomobile embedded software platform that electron control , consult EuropeOSEK standard, structure the ultra and miniature and real-time and safeembedded operating system, and face the embedded power of the automobileelectron and always become and control the foundation used and special-purposeprogramming interface;Because of this platform, developing the motive force ofthe commercial truck always becomes the electronic control system, form sectorstandard and norm, promote the ability to develop independently of embeddedsoftware of electronic field of automobile of our country.Research contents of "supporting the embedded software platform project ofthe automobile electron ", including: Ultra and miniature and real-time and safeembedded operating system of consulting European OSEK standard;Whole hardware of project develop the board for ECU that is researched anddeveloped independently , regard controller MPC555 a little as the core, combinerelevant introduction and deal with the circuit and export and drive the circuit ,form the intact hardware platform.Here, combine the hardware characteristic of the little controller MPC555,writing the embedded motive force facing automobile electron always becomesand controls the foundation used and special-purpose programming interfacestorehouse, and embedded operating system, develop and go to and alwaysbecome the electronic control system with the motive force of the truck, carry onthe application demonstration that the motive force of the commercial truckalways becomes the electronic control system.HARDWARE ARCHITECTUREECU developed develops the electronic control system that the board issuitable for the Diesel engine , offer hardware platform operated to debug forsoftware that project develop, including input signal punish the circuit mainly,key controller and periphery auxiliary device, is it urge circuit 3 parts to output.Key controller MPC555 whether Motorola MPC500PowerPC simplify ordercollecting type 32 microprocessors. It can in work under the environment, job itsclock can reach 40MHz, MPC555 with power floating dot computing abilitysupport the complicated algorithm. Its abundant function, flexible disposition,steady performance makes it used widely in such trades as aviation, car-making,relay protection,etc.The introduction dealing with the circuit and is divided into the introduction,switch or cycle of the analog signal in input signal is dealt with, it according towith deal with from signal that sensor come. When the input signal is the analogquantity, such as the signal of the air-meter, the sensor signal of temperature, theanalog signals of the pressure,etc, change A/D to them first, turn into the digitalsignal that a little controller can be dealt with, if when the analog signal input isweak , need to be enlarged. When the input signal is measured for the switchamount or cycle , such as the rotational speed, the corner, start the switch, waitidly rapidly , need to enlarge, have a facelift, strain waves, turn it into a standardvoltage range of the peripheral circuit of little controller , then input the littlecontroller to deal with.Outputting and dealing with the circuit is the signal of sending out the littlecontroller according to different execution architectures, turn the signal intodifferent drive signals. Such as the switch signal of the indicator lamp, gush outthe pulse signal of the variable pulse width of the oil device, control pulse signalof the regular pulse width of the valve,etc. idly rapidly. And carry on energy ofthese signals to amplify, in order to drive the executive body.CONCLUSIONBefore the thesis has finished, having already realized the demand for theproject, the technical indicator of the project has reached the international andpresent level, have shortened our country and disparity of the developed countryon the automatically controlled respect of the automobile.