Bitauto Original During the Chengdu International Auto Show held last month, SAIC MAXUS brought its brand new hardcore mid-to-large SUV - SAIC MAXUS Territory. I believe friends who have seen the pictures of the new car will definitely like it. Attracted by its domineering appearance. Of course, this new car has attracted attention not only because of its appearance, but also because it is the first SUV equipped with diesel light hybrid power - "SAIC Maxus Xuanyuan Power Technology". When the diesel 2.0T engine meets the 48V mild hybrid system, what can it bring to the territory of SAIC MAXUS? I hope you can find the answer after reading this analysis.
Perhaps some friends have already raised questions: "Why is it a diesel mild-hybrid system instead of gasoline?" You and I both know that diesel engines have the characteristics of high torque and low fuel consumption, which is very suitable for a hardcore medium and large SUV. The performance requirements of the engine, and in the case of complete combustion, the calorific value of diesel is slightly higher than that of gasoline. The combination of various factors led SAIC MAXUS to decide to develop a mild hybrid system based on diesel engines.
This diesel engine is the first WGT+VGT two-stage supercharged diesel engine in China. It is adjusted through three vacuum valves to achieve free switching between high and low pressure stages: small blades are used in the low speed range, and two blades are used simultaneously in the medium speed range. To work, large blades are used in the high-speed range; when the engine speed reaches 1000rpm, the turbine intervenes, and full torque can be output when the engine speed reaches 1500rpm. In order to further increase the output power, SAIC MAXUS also installed an integrated water-to-air intercooler on this engine. The purpose is to increase the cooling efficiency of the intake air during the engine intake stage, thereby improving the supercharging effect.
In terms of reducing fuel consumption, this engine uses Bosch's fourth-generation high-pressure common rail system, variable intake vortex technology and variable displacement oil pump. The injection pressure of the fourth generation Bosch high-pressure common rail system is as high as 2000bar, which provides better atomization of diesel. The injection pressure of the system can be flexibly adjusted within the range of 200 to 2000bar, which not only reduces fuel consumption, but also reduces smoke and smoke. NOx emissions. Variable intake vortex technology can ensure the combustion stability of each cylinder. The variable displacement oil pump can adjust the flow rate of the oil pump in real time according to different speed loads to ensure that the oil pump operates at the lowest energy consumption. The ultimate goal is Reduce fuel consumption.
I believe that until now, whenever diesel engines are mentioned, inherent labels such as "high vibration" and "high noise" will still appear in everyone's mind unconsciously. Therefore, in order to improve the NVH performance of the engine, this engine uses a dual-axis balancing mechanism and crankshaft offset technology. The two asymmetrically arranged balance shafts can balance the overturning moment of the engine and reduce vibration;The installation position of the engine crankshaft is slightly staggered from the left and right of the piston to ensure that the movement of the piston in the engine cylinder is perpendicular to the engine cylinder, which can reduce noise and make a small contribution to reducing fuel consumption.
Of course, in addition to these, SAIC MAXUS also improved the strength of the cylinder head for this engine, used a sandwich steel plate oil pan, and designed a lower frame between the body and the oil pan. All of this is In order to improve the NVH performance of the engine. Okay, after talking so much about engine technology, let us turn our attention to the 48V mild hybrid part. As mentioned earlier, the 48V light hybrid system consists of a BSG motor, 48V gear train, bidirectional DC/DC converter and ternary lithium battery.
Not much to say about the 8.4Ah ternary lithium battery, which can provide the vehicle with the required electrical energy when the engine is stopped, and is used to store braking energy from kinetic energy recovery. It can drive a 48V motor when needed; 48V/ In addition to charging the 12V battery, the 12V DC/DC converter can also achieve 12V → 48V boost charging. Another point to mention is that this hybrid also has a passive power generation function. That is, when the 48V battery fails, the BSG motor can ensure the normal operation of the 12V system through the "passive power generation mode".
Editor’s comment: “Smoother start/stop, improved acceleration performance, and fuel saving” is the label that SAIC MAXUS puts on Xuanyuan Power’s 48V light hybrid system. Unfortunately, this time it is just a simple analysis meeting. We It is not possible to drive SAIC MAXUS Territory car. However, this system has gone through 1 million 48V start/stop special endurance tests, and the engine has gone through 80 bench endurance tests in 9 categories, totaling more than 70,000 hours. SAIC MAXUS should not be fooling us. In the future, SAIC MAXUS will also launch SAIC π high-performance engines and plug-in hybrid systems based on diesel engines, and continue to explore the possibility of light-duty diesel engines.
Bitauto's popularity list shows that SAIC Maxus Territory has an average daily attention of 5,655, ranking 72nd on the mid-to-large SUV popularity list. For more data, please view it in the Bitauto App.