Question and answer on the ECU

Question and answer on the ECU website site

　　ECU is short for Electronic control unit .The function of electronic control unit is operating processing, judging the information from air flow sensor and any other sensors in light of its program and data.. And then it outputs instructions and provides the fuel injector with a certain width around pulsesto control circuit. 　
　　ECU also know as " trip computer "and" on-board computer ". From the application,it is a computer controller for automobile,which also called car-specific microcontroller. It is the same as the single chip microcomputer which consist of a large scale integrated circuit.Such as the microprocessor (CPU), memory (ROM,, RAM), input / output interface (I / O), ADC (A / D), shaping and driving.
　　There is a voltage stabilizer on the internal key ,so the voltage range of ecu is generally 6.5-16V. The operating current is in the 0.015-0.1Aand operating temperature of minus is around 40-80 degrees.The ecu can be able to bear below 1000Hz vibration.So It is less likely to damage the ecu .The CPU is the corn of the ECU which has the computing and control functions.when the engine is running, it collects all the sensor signals, carry out calculations, and change the results of calculation into a control signal to control the controlled object.Meanwhile, the ecu also control the ROM RAM , input / output interface (I / O) and other external circuit . The program in the ROM memory is based on the file which was been worked out and taken a large number of experiments.What’s more , all the sensor signals can be computed and compared constantly by the program.And the results can control engine ignition, air-fuel ratio, idle speed, exhaust gas recirculation and many other parameters. The program has auto-diagnosis and auto-protection functions. it can automatically record the error in the RAM ,take some the protective measures and read the alternaltive program from the above program to keep the engine running.Then the car can be drived to the repairshop when the system failure.
　　In normal circumstances RAM will record the data incessantly during vehicle traveling, which will become the ECU learning process,It can adapt to your driving habits and provide the best control state,so the program also called adaptive process.But beause the program is in the RAM which is the same as the error .Once lose electritity all the data will lose .
Nowadays the ecu can be found not only in the engine ,but also in many other places.For example , Anti-lock brake system, 4 x 4 drive system. automatic transmission, active automotive suspensions, the airbag system, multi adjustable electric seats and so on . With the development of Electronic Automation, ECU will be increasing and the line bocomes more complex.In order to simplify the circuit and reduce cost , the information transfer among the ecu of the car need to adopt a technology called multiplexing communication network, which combine all the ecu in a durable network..It also called CAN data bus.
    Due to the rapid progress of automotive technology,the modern car not only need to adapt ro all kinds of weather , circumstances and the drivers various requirement,but also should be promise that it can be drived in various complicated cases.Moreoever, the auto emissions and fuel economy standards should be controlled by the car .Therefore in most cases,the program in the original ecu is the best compromise which meet all conditions.For example ,under some conditions, the air fuel ratio(AFR )may be adjusted more thin by the programmer to cut the fuel consumption which is helpful to through testing fuel consumption standards.However, the AFR of the original ecu will be set at 1：14.7 in other time . which is the most likely meet the emission standard ratio.
    For most engines, the maximum power of the AFR can be issued in the a thicker mixture or the more oil and less gas range .In order to enhance the fuel adaptability ,ignition advanced angle set by the manufacturer can be adapted to the Lower grade of fuel.It also mean that it is not bound to be perfect with ignition advanced angle and the grade of fuel we use now .So if the file can be modified in power , the horsepower can be increased at 5-8% and the car with Turbo is at 15%.
    If you don’t want to compromise ,the best way is to rewrite the ecu file according to individual drivers requests .However，because of the cost and technical levels ,some fans will assemble some accessories called “secondary air-“ or “APEXI” to improve the gas mileage and the amount of air.But in fact ,these accessories around the original sensor or change the voltage of sensor to deceive the ecuso that the Air-fuel ratio of the engine can be changed and the power can be improved in some cases.
This incomplete way has side-effects and even cause security problems.So although the an orthodox approach modifying ecu costs hagh ,it can avoid sequela.

Q1：why not design like this before the car go out ?
A:multinational companies,such as the BOSCH、SIEMENS、MM and so on .Their products are sold all over the world . Because the gasoline quality ,temperature, atmospheric pressure, humidityand engine vary greatly from country to country, the ECU softwre should be comply with the conditions of various countries to use.What’s more , the ecu must be durable, economic, and environmental,so original computer set a conservative limit and keep some space available for upgrades.

Q2:Does it will affect the security and life of car after modification ?
A:It will not affect the security and life of car after modification. (DT)Digi-Tec just optimize the ECU engine operating parameters and use the engine ‘s designed capacity as efficiently as possible. Optimization is based on ensuring the safety of life and security.Meanwhile , in order to bring a best space for the car to run, it will also keep the absolute safety of the space.So it will not affect the security and life of car after modification.

Q3 :Does the car will cost too much gas after modification?
A:It don’t increase horsepower by injecting,but by regrouping and adjusting oil supply and ignition curves. According to the signals of different sensors,the computer make the best mix of air and fuel to increase horsepower.As a result ,many customers argue that the car run more faster and less oil after modification.

Q4:Does it have harm to the engine after modification?
A: ECU modification is able to take Full advantage of the performance of the car and accelerate the ecu computing speed. What’s more ,it can improve the engine's combustion efficiency ,so it is not harmful . New car can be upgraded in the run-in period. (DT)Digi-Tec is the ecu optimization of the master , the largest Europe ecu data designer and the ecu industry leader

Q5:What’s the features of the Digi-tec modification?
A: After repeated trials into practical promotion ,the Digi-tec modification made a two-way effect .On one hand ,it can improve the power ,on the other hand it can get good gas mileage.And this two advantages do not conflict with each other. Digi-tec modification not only can improve the power or get good gas mileage,but also integrate to enhance the performance of all aspects of the car,which is helpful to balance and full play the various parts of the performance . The difference between (DT)Digi-Tec technology and other brandsis that DT) Digi-Tec start processing the data before entering the signal prior and solve the problem from the source .As a result ,it can process 100%data.However , the other brand just can process 40%data,so it is easy for the engine to have the problem.Moreover , Auto emissions processing is not ideal

Q6: What effect does it have after modification?
A: Firstly ,it can improve the power and torque ,Secondly ,it can get good gas mileage and require low emissions from automobiles .At last ,it can achieve the effect of energy saving.

Q7: What is the upgrade process?
A:We will read the chip data from the engine ECU chip,then compressed the data and spread it to the German headquarters, Since our headquarters has a large car database, the system will optimiz the data and calculate the most appropriate data of the ECU.After that the data will be send back ,then we can write the new file into the chip .

Q8: Is it unable to return to the original diagnosis for the computer after modification? If it will lose the security features anti-theft system?

A:Since our dealers also have the tools ,the original file will be read and send to the Digi-Tec headquarters .The headquarters will transfer the information from their manufacturer. and adjust it in accordance with customer’s needs.Therefore ,it will have any effect on the original features.For example the original electronic systems and the electronic equipment installed on the car .What’s more , fault code that can not be eliminated will not appear on the diagnostic computer. Security systems also will be preserved.

Q9:How about the life of the engine after modification?
A:ECU modification will not affect any part of life. The computation logic of the ecu is not the same as the computer .It has no chose except 0 or 1.It means that there are only two circumstances it choose.One is unavailable,and the other is available.As long as it is no damage ,the ecu is available.

Q10:How long it will take Digi-Tec to modify?
A:100% of the DT data is passed by the the German.As you know , the time difference between German and us is 7 hours.So the updating file will be send back around 17:00—21:00 on Monday to Saturday night .The modification can be finished in the day.But if too many cars need to be modified，it required to complete the next day.

Q:11Why are fuel consumption of the car so high After upgrading the other brands?Moreover,black smoke appear when accelerating and the output acceleration is not smooth .
A:There are two most important factors.One is that procedures are not accurate,the other is that the programs is undesirable. Accordance with the internal combustion engine of the law, only the best combustion efficiency can the engine achieve maximum output. Digi-Tec provide the100% aacurate upgrading file which is made for each car.

Q12； Which models do (DT) Digi-Tec upgrade ?
A: All of the German cars and European luxury car!

Q13: What does the ECU work environment look like?
A: The voltage range of ecu is generally 6.5-16V. the operating current is in the 0.015-0.1A and operating temperature of minus is around 40-80 degrees.The ecu can be able to bear below 1000Hz vibration.So It is less likely to damage the ecu .

Q14: Is there any limitation of condition though auto emissions meets the Europe Ⅳ standard by Digi-Tec technology?
A:Yes.For example ,the gasoline standards, whether the engine is close to the original ,catalyst (silencer) and so on.

Q15: Are the cars be limited to conduct normal maintenance at the 4s dealer after modification?
A: Digi-Tec's products is unconditional access to 4s dealers in Europe. In order to ensure the data synchronization, Digi-Tec keep pace with manufacture. So Digi-Tec's products have no effect on normal maintenance in China.

Q16；Why are so many domestic models that (DT) Digi-Tec can not provide an updating file?
A: Digi-Tec's products which developed for each models requires to be tested thousands of times.Meanwhile,Only certified by TUV ,can the products launch into the market .

Q:17 There are too many accumulated carbon on the spark plug .How can we do ?
A:With the accumulated carbon, the power and economy of engine will be significantly reduced. if the gasoline engine is in for a long time in low speed , low load and incomplete combustion , the Carbon pollution occurs. It is a soft carbon black,which attached to the spark plug insulator. When all of the material will cover the insulator surface, they will gradually reduce so that they can damage the insulation between the spark plug and effect spark plug arcing. When the insulation is less than 0.5-1M ohm, there are no reliable spark on the spark plug.And the combustion of the engine cylinder is in the disorder and difficult situation,which brings the engine starting difficulties and unstable idle speed; The air-fuel ratio relys on computers to adjust, but a simply adjustment of air-fuel ratio will bring other problems on the engine system.So it is the time that we should consider to solve the problem by adjusting the ECU program .
There is a Passat 1.8T which replace the spark plug 3months before modification. After upgrading ECU a month later,we removed the spark plug
and found that the surface of the spark plug is white .It mean that the car is not good combustion before midification.However, combustion and Air likelihood ratio of the engine can be improved after modification,so the accumulated carbon will disappear.

Q18:There are much fruste sense when the car shift. How can we do?
A: During the design process,the manufacture think that their products are sold all over the world . Because the gasoline quality ,temperature, atmospheric pressure, humidityand engine vary greatly from country to country, the ECU softwre should be comply with the conditions of various countries to use.so it have reservations about adjustment in the program , such as the timing shift. they have to consider some areas of poor quality oil.Since the heat generated is not enough to change gear at a specific speed,so it will enable a reduction in engine speed and change the gear.Then you will have fruste sense.
Through ECU tuning, engineers can re-set parameters in the light of the environment and the quality od the oil.Then the more power can be increased when the car shift. The speed had adjusted and the fruste sense will disappear.

Q19：If the car inability to speed upacce，how we can do?
A: There are a lot of cases on the poor acceleration.such as the fuel quality problems, machine exhaust system, body weight and tuning process of the engine . Excluding oil and the intake and exhaust system, if the feeling is not ideal, we should consider to making improvemengts from the control program.
During the design process,the manufacture think that their products are sold all over the world . Because the gasoline quality ,temperature, atmospheric pressure, humidityand engine vary greatly from country to country, the ECU softwre should be comply with the conditions of various countries to use.So in general, outgoing performance of the car can only reach 65-70% limits of design performance.
By increasing the voltage of the ignition, change the ignition timing settings, increasing the feed rate and increasing the computing speed,the ecu tuning can advances 10-25% actual capabilityand significantly enhance driving comfortableness.

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