SAIC Anting powertrain manufacturing laboratory
October 2006, SAIC officially released its first own-brand high-end cars Roewe (Roewe) 750, until 2012 when, SAIC company's total passenger car sales have exceeded 200,000, and sitting on the Roewe, MG dual-brand products . At present, the company has Yizheng, Shanghai port, and the United Kingdom Longbridge along with Nanjing Pukou four vehicle manufacturing base, producing Roewe brand, MG brand vehicle series and KV6, K4, NSE engine series automotive products.
Today we are fortunate to be able to visit in Shanghai Anting, Roewe powertrain test chamber, to tell the truth as an automotive editor I'm looking forward to this trip because of the distance can be 0 Roewe a visit to the core technology laboratory. This is a car brand, but the most important of the "military areas", so some top-secret laboratory and research and development of products that we can not report, but that's okay, our focus is on the Roewe 550. Morning's interview has been reporting a road, a group of non-stop of our trip came to powertrain test floor outside the gate by the responsible engineer into the test chamber to explain.
In this rigorous work area neat breakdown of the different functions and sizes of 16 laboratories, would we be afraid to disturb the work of the engineers, but they concentrate on work attitude has been to us as air. Each test has two outdoor engineers staring complex number on the screen, where a 24-hour shifts, and they want to put through a variety of tests Roewe playing the best quality.
Powertrain for a car is absolutely the core competitiveness, too professional data and analysis do not say the average consumer, even if the internal staff Roewe not all familiar with, so today we primarily from our daily driving The most relevant research to find out, how engineers conduct research and development and testing.
Powertrain semi anechoic chamber
Why is a semi-anechoic chamber it? Because our car while driving which is not possible in fully soundproofed space travel, so engineers must first Roewe simulate normal driving environment, and even the sound of the ground must be fed back simulated. This semi-anechoic test chamber is very interesting, it is actually two houses, the outside is a large "shell", with only a small room inside doors are figured, and the rest between them is completely separated. Laboratory inside the walls are thick insulation material, thickness at least 60cm, if you count the two parts of the house plus the hollow outer door thickness, the trial chamber's entrance about 2 meters in length.
"Noise" is a very wonderful indicator because when we sat in the library reading time in meditation, even if the pace will become slight noise, and when we excited about being in the concert scene, playing and deafening Scream have become a wonderful note. For a working engine, the noise test is actually very complicated, not as we imagined would simply be reduced to a noise standards will be successful, because the "noise" of the criteria is too difficult, the driver may be due to environmental, speed, number of objective factors, even personal preferences and feelings of the day produce different evaluation results. So debugging an engine noise becomes particularly difficult because of the simple drop db Roewe far less than the goal.
Responsible for the noise test chamber engineers told us, the Roewe 550 1.8T engine noise as low as 64 db or so. First of engineers in the test chamber when the engine is running, monitoring, and then through software analysis and experience to judge which one is the noise component, and then one by one, debugging, optimizing, and finally to the overall noise control at 64 db or less. Second, through the analysis of complex graphics on the screen, according to the various components in a certain vibration frequencies produced db there is not excessive, but produces harsh and unpleasant noise again debug (cite a simple example, draw a sharp object blackboard business, db, while not high, but makes some people want to die). Engineers will last longer overall and rigorous aspects of the various components of the noise to make the final commissioning to achieve the best "pitch."
It sounds so simple, but the engine is running in a time which a component is detected by the sounds, and then how to debug, which are the need superb technology and rich experience and will never be like around the radio volume knob so simple. Engineers will be based on the character models themselves tuning noise, such as sports car sounds and sound business models is certainly somewhat different.
Here is a 3D graph, the horizontal axis represents the frequency of the sound, the vertical axis represents the engine speed, speed changes in the frequency distribution can be seen the process is not the same, the color represents the size of the sound, the sound is relatively general red large adjustment range can see the different frequencies and different speeds which sounds great, and then focused on solving the problems which speeds. There you can also see, I drew a pink line marked out, and I know there is a part frequency is in this, I see here, there have been voices, if followed to resolve this problem is to change the main parts.
--- Gearbox durability and performance of laboratory tests
This is the test chamber Roewe a gearbox, is durable and the ongoing performance of the test, the same outside the test chamber two engineers test room gearbox carefully monitored during the test data for each feedback. Gearbox test is somewhat different, because it not only to test the mechanical aspects of the hardware, it's software also need to be tested. Test chamber is a powerful simulator, which can simulate various road conditions and physical conditions, and even simulate different people's driving habits.
In this laboratory, the gearbox test completed entirely by this simulator, it is in good condition setting operation of the transmission, the key is to be constantly shifting and accelerated durability test, in addition to software testing. Both ends of this simulator can simulate the rotation of the wheels working conditions, through axle and drive shaft connected to the gearbox, just like a real car on the road for the same.
Our engineers speed their development, there are two, called development and testing, there is something called the recognition test, development and testing of different development purposes according to set time standards, and recognition test is a user-oriented. For example, like this test, they will use the user's characteristics, such as the gearbox to do a full speed, such as 50,000 km. This test simulates a vehicle designed maximum speed of 195 km / hour continuous run 50,000 km. Customers generally impossible to actually do that driving mileage, which is an enhanced assessment.
There is also a fully will follow customer-oriented, analog customers driving habits, taking different samples to analyze the customer's driving habits is how looks like, this simulation is not just for the country, because there is a product for the international , so the engineers would choose more than one place, then developed a standard, and then to test. For example, if you want to test with 160,000 km, this bench can be fully simulated, ran the simulation, but also on the vehicle, the vehicle will run 160,000 km, round after round, and finally to a different state run three. It is understood that 160,000 km of testing to 24 hours non-stop run at least three months, so rigorous testing to ensure the quality of Roewe cars.
In fact, we see a lot of testing just a small part of them, the engineers will do the environmental chamber simulations, from stand point of view, they can simulate the Tanggula altitude, you can simulate the temperature to 60 degrees, These can be achieved through simulation. In addition to the analog outside engineers will do it measured, for example, the winter will go Heihe do the test, a test base over there, the summer will go to Hainan, there Tanggula Flaming Mountains in Xinjiang, and even sometimes have to go to Australia . So these unsung engineers are actually very busy, their lives rarely "holiday" of the word.
In addition to hardware, engineers Jiao Wei also introduced us to the Roewe 550 dual-clutch gearbox TST electronic control system development, including its software, electrical architecture and sensors content. "First we have to go through a lot of analysis how the control transmission, not only to meet the basic driving functions, including such as starting, crawling, climbing, lifting gear which is the most basic, we also take into account the case of poor working conditions, such as said traveling on the ice, in the case of how low temperature driving, high temperatures how to do that in climbing time how to do that in high latitudes Tanggulashan situation how to do this, we will carefully setting and certification, so algorithm design to consider something more complex, mechanical things can be seen, the algorithm is invisible, but these things are also relatively more central secret stuff. "
Engine performance laboratory: emission, fuel consumption, power
This laboratory study was done by the most complex and most important content is to engine emissions, fuel consumption, power calibration. The so-called calibration of these parameters is to achieve an optimal solution by optimizing, so that the engine's fuel consumption, emissions, power design and development to meet the requirements of this simply means to do this. Engineers through a three-dimensional map sheets, research engine parameters, in which position the throttle opening, fuel injectors in the end how much oil should be sprayed, when to start the ignition, etc. These efforts are all there is to do.
It is a pursuit of the best work, all values are variable, but also to put these values are calibrated to an optimal value, making the relatively most powerful engine.
We all know that the car's engine is an internal combustion engine, its power and all of the indicators through the combustion gas mixture to achieve, so it can be said that we said above, these are all part of a major issue, and that is burning development. Burning development includes two aspects, one is hardware development, the other is the control of the ECU, which is the control of the combustion process, and now the car is a pile of scrap metal from the electricity, so there is a pre-designed sample after production , to get the test bench. After the test calibration, calibration after the road test to the market, which is a series of work, then the core is burning, the combustion process to be controlled is good, very solid combustion system to be done, followed by calibration to in this based on the well.
An engine development in addition to combustion development but also to pay attention to engine design, such as an engine inlet must be here, exhaust must be there, and that there is a logical relationship, and not just to figure, including why design and why design of gas would also be logical. Inlet design will affect the flow of gas into the engine, exhaust, too. In addition, the temperature is one of the factors that must be considered, and temperature control of internal combustion engine is very complex, even external exhaust gas temperatures are also to be taken into account. Extended, will also involve the layout of the engine compartment.
Final Roewe engineers as they did all the work and effort of a vivid metaphor, "we work like on a piece of white paper to answer, they asked, make my own answer, but consumers found the volume of people, bad answers to good only consumers can give the evaluation, and evaluation standards also depends on the person.
