There is no doubt that the YC6K13 diesel engine of Yuchai’s shares will be of concern to all parties in the sixth commercial vehicle evaluation that I trust.
Because it is the largest displacement, the largest power model in the participating products. Even taking a look at domestic heavy-duty circles, 12.939 liters of displacement and 580 horsepower are enough to make it disdain.
However, compared to the large-displacement, high-power, high-torque selling points, "Commercial Automotive News" reporter is more concerned about is its real material.
Really new technology allows you to use enough
In 2010, Yuchai released YC6K. This series has YC6K12, YC6K13 two engines, participate in the selection, it is YC6K13.
When it comes to 13-liter engines, there is no shortage of products in this displacement range. However, careful study of the parameters will reveal that many of the 13-liter products are actually “more than a little†from the 13-liter displacement. The YC6K13 has a displacement of 12.939 liters and is a standard 13-liter engine. Really, this is one of them.
Researching YC6K data, the reporter discovered several key words: first, first, latest, original. For example, YC6K is a product jointly developed by Yuchai and an internationally renowned component supplier. YC6K is the first overhead camshaft four-valve heavy-duty diesel engine that meets the Euro 3~Euro 6 emission standards in China; it is the first use of RG reliability in the engine industry. Product growth technology; the use of the latest Top-DownCooling cooling technology; originality introduced precision combustion and electronic control technology, engine reverse cross-flow cooling technology, high-strength materials and efficient engine cylinder braking technology.
For those technologies, people who do not have a certain knowledge reserve are really difficult to understand. Fortunately, Xiaodong Chen, deputy manager of the marketing department of Yuchai United Power Co., Ltd. (hereinafter referred to as Yuchai United Power) explained it in plain language, letting the reporter sigh. Awesome!
The first is the YC6K component development model. The 6K engine adopts imported parts or joint venture suppliers of internationally renowned brands in the country. At the beginning of the design of the whole machine, the boundary conditions are determined so that the parts can work in the optimal range, and their performance and reliable advantages can be fully utilized. Different from the simple and easy to put together, it can be said that the same. Real material, this is the second.
This is followed by the application of RG (Reliability Growth Technology). “U.S. General Motors needed to solve reliability problems when it came to research and development of aero-engines. So we developed RG (Reliability Growth Technology), which was later used by other companies. Simply put, reliability growth technology is based on market demand before product development. Set targets, and gradually increase the level of engine reliability through a series of control optimization measures during the development process, and ultimately achieve the reliability target requirements, he said.
Let's look at several unique tricks of YC6K.
First, the Top-Down Cooling cooling technology (efficient reverse cooling technology) has the advantage that the cooling water first touches the nose of the cylinder head, allowing the temperature in the nose bridge area to be reduced by 15~16°C compared to conventional engines. This can increase the reliability of the cylinder head to Higher level. In addition, this technology also allows the engine cooling system to be designed to be more flexible.
Second, the use of overhead camshafts can be called "an unprecedented." "Before the introduction of YC6K, over 10 liters of domestic commercial vehicle engines did not use overhead camshafts." Chen Xiaodong told reporters that overhead camshaft fuel consumption, noise, and reliable advantages are prominent.
Specifically, the traditional transmission method is to form a long transmission chain with side-mounted cams, push rods, tappets, and rocker arms. Since these parts are all elastic, they will cause problems such as compression and deformation; in addition, the cam type The line controls the opening and closing speed of the valve. If the transmission chain is long, the profile will not be transmitted accurately. The overhead camshaft removes the push rod and the tappet and transfers it directly from the camshaft to the rocker arm, which can more accurately control the valve opening and closing, so as to control the combustion more accurately to achieve the goal of fuel economy, and also reduce the valve mechanism transmission. noise. Second, the conventional engine uses side-mounted camshafts. In order to pick up the movement space of the tappet, it is necessary to leave space on the side of the machine body during casting. This results in asymmetry of the machine body, large internal stress in the cooling process, and an impact on the service life; The use of a symmetrical structure on the overhead camshaft can increase the strength of the body, which can improve the ability to resist burst pressure and improve the reliability of the whole machine.
Third, the use of efficient engine retarder technology. Thanks to the overhead cam structure and the joint development with the internationally renowned brake company JACOBS, the braking power of the YC6K reaches the forward power output level of the engine. In short, how much speed is used on the slope, the same speed can be used. How big a slope. Its advantage is that it can reduce the watering device, multi-pull goods, can also eliminate road safety hazards, and can effectively reduce the wear of the brake pads. The benefits generated each year are very significant.
Fourth, integrated design technology. Through the integration and integration of similar functional parts, the number of engine parts is greatly reduced, the risk of leakage is reduced, and the reliability of the engine is greatly improved, while the structure of the entire machine is compact and the appearance is beautiful.
Breakthrough technology is accompanied by high difficulty, but it is precisely because of the adoption of advanced technology that the YC6K can “always be imitated and never surpassedâ€. The technology is far ahead and it is real material. This is the third of its kind.
Solid low emissions and high reliability can have both
Guoliu was referred to by Yu Ping, chairman of Yuchai Group’s board of directors, as “a challenge to Yuchai’s life and deathâ€. In terms of emissions, YC6K has done a very solid job.
The YC6K is aimed at Europe 6 at the time of design. This is what many people know, but few people know what this means.
One of the biggest requirements of Europe 6 is the explosion pressure control in the cylinder. In the Euro 6 stage, particulate emissions are close to zero. In addition to DPF control, the combustion process also needs to be more complete, which puts higher requirements on the explosion pressure—the explosion pressure in the cylinder is at least 220 bar. "YC6K is designed according to 220bar explosion pressure. In fact, according to the national four, the five emission requirements, the explosion pressure does not need to be so big, we are currently using about 170 ~ 180bar. The excess explosion pressure can be transformed into reliability This is the unique advantage of YC6K, said Chen Xiaodong.
In the face of State VI, the workload is huge, mainly to increase the outbreak pressure, improve the fuel system, and increase DPF and EGR after reprocessing. "The EGR will change the control of the engine. The DPF needs to be calibrated, mainly in the carbon accumulation mode." He further explained that carbon particles will accumulate in the DPF, and when accumulated to a certain extent, the exhaust will be plugged. It is necessary to regenerate and judge the regeneration time. If it cannot be accurately judged, it will cause the engine to malfunction. Therefore, the DPF carbon accumulation model needs to be calibrated according to the engine operating conditions. This process is very complicated. In addition, because the engine has a length of exhaust connection pipe extending to the vehicle, if the length of the exhaust connection pipe is different, the direction of turning is different, and the remaining amount is not enough, the carbon accumulation mode that has previously spent a lot of effort on calibration can not be used normally. Therefore, it is necessary to work together with the auto manufacturer to confirm the diameter of the pipe, the degree of insulation, and the resistance loss of the process.
It's soft and hard.
Designed from 2006, the first YC6K prototype was made in 2007, and the RG reliability target was reached in 2009. Yuchai took a full 3 years to make a bench test, and the accumulated bench test time reached 40,000~ 50,000 hours. The YC6K development process is inseparable from the support of hardware and software.
On the software side, YC6K's development process follows the standards of AVL, a well-known professional engine consulting company in Europe. Among the more than 30 test items and evaluation standards, Yuchai has already mastered it. On the hardware side, Yuchai's complete test equipment uses AVL products. “For example, we all use eddy current dynamometers. The advantage is that we can use electric drives when the engine is not starting to understand if its internal friction power level is up to the target. The hydraulic dynamometer cannot generate power and cannot do this work. Only the engine can be used to test the power and torque, assuming that the power measured by the hydraulic dynamometer is 100 kilowatts, but it does not measure the internal friction work at 10 kilowatts, and for Yuchai, we can measure 10 kilowatts. And it is required to control under 8 kilowatts, if it measures more than 8 kilowatts, dismantle it and inspect it to ensure that the quality of the engine is the same at the factory. At the same time, the eddy current dynamometer responds quickly and can perform transient loading experiments on the engine. The driver's feeling is that acceleration is stronger and smoother.†Chen Xiaodong told the “Commercial Automotive News†reporter that the eddy current dynamometer is only a detail of performance development, and “Yuchai has many unique mechanical development and performance. Developed to protect the quality of the engine."
Compared with the YC6K12, the YC6K13 has improved its engine capacity, and its reliability has been further improved. "For example, the fuel system has been optimized, and the valve-assisted braking has used higher-power products," said Xiaodong Chen.
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