[YesAuto Design Decoding] From the first Tiggo to Tiggo 3 in 2005, to the current new Tiggo 5, Chery's progress in the SUV field is obvious to all. What kind of hard work has gone through behind this? Today, let’s change our perspective to see how Chery’s positive R&D system and the 1.4 billion test technology center “trained” this Tiggo 5?
● From Tiggo to Tiggo 5
Tiggo 5 2016 2.0L CVT Honor Edition
The changes from the 2005 Tiggo to the current Tiggo 5 are largely due to Chery’s 1.4 billion investment in the construction of each laboratory, the improvement of each test project, and the V-shaped positive R&D system proposed in 2012. .
So what performance or technical characteristics of Tiggo 5 has been accumulated in the accumulation of Tiggo's ten-year SUV technology? We use the story behind the development of Tiggo 5 in the test technology center to interpret Tiggo 5 from another perspective.
● How safe is the collision of Tiggo 5?
I personally think that life is our most precious wealth, so we first talk about safety, and only when safety is assured will we ask for power, fuel economy, maneuverability, and so on. Tiggo 5 has received the C-NCAP five-star crash safety guarantee, which comes from several simulated crash tests conducted by Chery Crash Safety Laboratory. At present, Chery's laboratory can not only simulate frontal 100% overlapping rigid barrier collisions, frontal 40% overlapping deformable barrier collisions, deformable movable barrier side collisions, whiplash tests, and other domestic mainstream C-NCAP collision test projects. , It can also do side column collision test and pedestrian protection collision test of European E-NCAP.
Compared with the frontal collision with 40% overlapping deformable barriers, when the 30% small-angle overlapped offset collision, the front of the vehicle bears a smaller impact area, so the safety requirements of the body are higher. However, the more stringent requirements for frontal offset collision safety are the American Highway Safety Insurance Association IIHS’s 25% overlapping offset collision test. Compared with the former two, the vehicle under test will not be protected from the body rails. , Only rely on suspension, tires and A-pillars to protect the passenger compartment.
The introduction of such advanced hardware equipment can truly reflect the problems of Tiggo 5 in the collision accident and guide engineers to improve them. So what are the specific improvements of Tiggo 5 compared to the previous Tiggo models?
The optimized design of the body structure and materials best reflects the safety considerations of Tiggo 5 in car crashes compared to previous Tiggo models. Tiggo 5 adopts MEC matrix energy-absorbing lightweight body, which can absorb and disperse reasonably during impact. The impact force is used to minimize the damage to the drivers and passengers in the car.
In addition, compared with Tiggo 3 and Tiggo, Tiggo 5 has also greatly improved in terms of body materials. We know that the beam in the front bumper of a car has a great impact on the crash safety of the vehicle. The manufacturing of the front beam of Tiggo 5 has changed from the original cold stamping technology to the current mainstream hot stamping forming process, and the strength of the steel plate has changed from the original The four to five hundred megapascals increased to more than 1,000 megapascals.
Most of the steel for these hot-stamped parts comes from the German Benteler company, a well-established German company with a history of more than 100 years that first applied hot-stamped steel to the automotive field.
● Why is the 2016 Tiggo 5 more comfortable?
How to evaluate the stability of a car may be different for the same car due to the subjective factors of each of us. For manufacturers' research and development, how do they give results scientifically and objectively? This requires the help of professional suspension and steering system test equipment.
Actual combat confirmed data, for the 2016 Tiggo 5's more comfortable setting, it was also reflected in our actual test drive a while ago (the configuration upgrade was significantly upgraded to test drive the Chery 2016 Tiggo 5).
A special steering controller is installed in the car, which can automatically control the rotation angle of the steering wheel and measure the system characteristics of the steering booster. For example, it can test the magnitude of the steering assist at different vehicle speeds to help engineers better set the car to have greater steering assist at low speeds, which is convenient for the driver to turn and stop at low speeds; and When the vehicle is running at high speed, set the steering wheel to be heavier to improve driving stability.
● How to reduce noise and vibration?
For the level of NVH (Noise, Vibration, Hashness) of a car, in the early stage of vehicle development, it will involve parameter benchmarking and CAE simulation analysis after vehicle modeling. After the prototype cars of the stage are produced, all aspects of one-by-one verification and problem finding and improvement will also be carried out. The semi-anechoic chamber of the vehicle is one of the important infrastructures for completing the test verification and problem finding.
Unlike the four-point engine mount system of Tiggo and Tiggo 3, the engine mount system of Tiggo 5 uses a three-point engine mount system. Because there are fewer constraint points for engine vibration coupling, the NVH problem of Tiggo 5 is relatively simple, and the noise and vibration level of the whole vehicle has also been improved. Through accurate testing in the semi-anechoic room, the idle noise of the front driver of Tiggo 5 is at Around 42dB, the rear noise inside the car is lower than 40dB.
If the attention paid by domestic car companies to noise and vibration levels reflects people's pursuit of car quality, then the material laboratory below proves our higher requirements for quality.
● Why is there always a strange smell in the car?
For newly bought cars, there will generally be unpleasant odors in the car, especially in the summer when the temperature in the car is high, so we often put bamboo charcoal, sachets, etc. in the car to absorb or cover it. Which interior parts are the culprit for the volatile smell?
● How to guarantee the quality of Tiggo 5 in a few years?
Due to the fatigue damage of the various parts of the automobile and the corrosion changes of the rubber parts, etc., a car that has been driven for several years will often experience component cracking and performance degradation. In Chery's endurance reliability test room, parts, system assemblies, and complete vehicles are tested in three levels to ensure reliability. The reliability requirements at the component level are the highest, and the system assembly level and the vehicle level are in descending order, because only by controlling the reliability of the lowest level can the reliability requirements of the vehicle level be guaranteed.
During and after the 45-day test period, engineers must analyze the door hinges, door seals and other components, and evaluate the changes in their strength, damping and other performance to ensure product quality.
Through an 18-day endurance fatigue test, this test bench from MTS in the United States can reflect the endurance reliability level of the entire vehicle after 10 years of 320,000 kilometers in the actual vehicle, and can detect whether the various parts of the vehicle are broken or not in the state of the vehicle. Phenomena such as oil leakage, and changes in the durability of each system assembly.
After visiting the Tiggo 5 in the five major laboratories of the Chery Test Technology Center this time, we can see that the Tiggo 5 focuses on the impact safety, handling stability, noise and vibration, interior materials and durability that consumers care about. Improvements have been made. The 2005 Tiggo cannot be compared with today's Tiggo 5 in every respect. Nowadays, behind Tiggo 5 is a powerful R&D test technology center and V-shaped positive development concept. However, compared to the Great Wall Haval, which has a full line of small, compact, and medium-to-large SUVs, Chery, which is a distance behind, really needs to accelerate. (Auto House Text/Picture Xia Zhimeng)