Text | Carry the pot to punch
Not surprisingly, Cadillac upgraded the 48V light hybrid power system to its own small and medium-sized SUV - the new American sports SUV, the new Cadillac XT4, and I have to say that in order to save fuel, the American brand is really open-minded.
Save a little is a little, but if you say that americans who like oil tigers have also begun to promote small displacement, it is absolutely deceitful, the suit thug Cadillac naturally "lived up to expectations" to keep an eye, it is more honest than Mercedes-Benz, plus 48V light mix system, the power is not discounted, is still the familiar 2.0T variable cylinder turbo engine.
Counting the upgrade points, from the new generation of Cadillac mobile Internet experience CUE that realizes the OTA intelligent cloud update, to the customized Bose Premium audio system on the new XT4 premium model, the ESS intelligent guardian safety system and the BFI integrated high-strength body structure, and the Haptic safety prompt vibration seat are all covered up in the light of this set of powertrains.
American characteristic engine values
Compared with the pleasing Europeans, American technicians in the car power system to think more honestly, oil tigers everyone does not want, driving experience is not willing to give up, for this generation of American engineers live overtime for several hours a day, and finally in the V8 era drumming out the engine closed cylinder technology.
Cadillac's L62 V8-6-4 was the first engine equipped with closed-cylinder technology, which, as the name suggests, can switch between 8, 6 and 4 cylinders to improve fuel economy by 5.5%-7.5%.
The only small regret is that the fuel-saving performance is not as good as imagined, the engine still has a certain probability of switching between 8 cylinders and 0 cylinders, and the immature computer numerical control system is a bit unplayable so clever calculation logic, often when the cylinder needs to be closed, it is directly replaced by a stall, and naturally it is not promoted.
GM was not discouraged, in 2004 to restart AFM technology, Chrysler introduced a logic-like MDS technology, by changing the length of the strut to play a role in closing a specific cylinder, Pentastar 3.6L V6 engine by this hand brushed the 2010, 2011, 2012 three Ward Top Ten Awards.
To "add cylinders" to performance, to save fuel, to reduce cylinders, full of american rough aesthetics.
The 2.0T variable cylinder turbocharged engine on the old Cadillac XT4 is the ultimate enhanced version of this technology, which can be durable on the one hand, the progress of technology, on the other hand, the qualitative leap in arithmetic logic.
The engine uses a three-stage sliding camshaft to change the lift of the valve, fully operating under the valve lift to increase the intake volume, low load with a smaller valve lift to limit the intake volume, in the cruise and taxiing state directly switch to the cam without lift, turn off the No. 2 and No. 3 cylinders, and drag the car with a two-cylinder ultra-economic mode.
According to official data, under closed cylinder conditions, fuel economy can be improved by 15%, and the reliability is not the former Wuxia Amon.
In terms of experience, in fact, this 2.0T variable cylinder turbo engine is already the pinnacle of general technology, but the policy has not let it go.
Strongest 996 hits
The tragic life of 48V light mixing
The policy requires that in 2020, 2025 and 2030, the average fuel consumption target of enterprises will be 5.0L/100km, 4.0L/100km and 3.2L/100km, and GM has unfortunately become the top place in 2018 for passenger car companies with negative fuel points.
Thankfully, the policy still leaves a hole for fuel vehicles, and the "Energy-saving and New Energy Vehicle Technology Roadmap" released in October 2016 proposes to focus on promoting the development and application of 48V light mix.
The stick of love falls, and the carrots are fed to the mouth.
At the beginning of the car battery voltage level is 6V, basically that is, to light a light, in the 1950s 6V upgraded to 12V to meet the needs of vehicle electrical appliances, listen to a radio or play a tape and CD can be carried, with the need for more and more functions of electricity, the traditional 12V battery can not be carried, germany's five major car brands Audi, BMW, Mercedes-Benz, Porsche and Volkswagen jointly 48V as a new standard.
The technology is not complicated, on the basis of the traditional fuel vehicle and the 12V system in parallel, the 12V system to meet the power demand of low-load equipment, the 48V system to meet the energy requirements of high-load equipment, including the whole vehicle camera or radar, adaptive cruise, active braking, etc., as well as the change to electricity-driven coolant circulating water pump, hydraulic steering booster pump, radiator cooling fan, etc.
The cost of the 48V system is not high, the only annoying place is that it will occupy the cabin space, in line with the logic of making the best use of things, the engineers let this system that could have been touched casually do the work of 996, it not only had to power the electrification equipment, but also had to run with the engine.
This 48V mixing system on the Cadillac XT4 is based on such a hard worker.
It is the power supply core of the engine and vehicle electrical system, reducing emissions with electric idle function at low speed, recovering excess power when starting and stopping and driving at a uniform speed, in addition, it also has to instantaneously output 4 times the power of the traditional starting motor to drive the engine to start at start, which can be described as engine work, it has to play auxiliary, when the engine is not working, it also has to assist in coasting and powering the electrical equipment in the car.
How U Doing forever suit thugs
When you drive the new Cadillac XT4, you can also become a "black heart capitalist", the only thing to hate is that in order to upgrade from a hit worker to a capitalist, you have to pay a little more, the 2021 Cadillac XT4 28T two-wheel drive technical guidance price is 259,700 yuan, the 2022 Cadillac XT4 28T two-wheel drive fashion type guidance price is 261,700 yuan, the latter WLTC comprehensive fuel consumption is 7.38L/100km, The comprehensive fuel consumption of the former NEDC is 7.2L/100km, and the acceleration of the official target 100 km/h is 7.6s.
Of course, the test standards of the WLTC are more stringent, in general, after increasing the 48V light mix, the fuel consumption of 100 kilometers will be reduced by about 0.3-0.4L, the route of our test drive is not long enough to obtain the final data, Shanghai is now 95 # the price of gasoline is seven pieces of four cents, equivalent to saving one or two dollars per hundred kilometers, the environmental significance is greater than the meaning of saving money, and it is unlikely to earn the difference by relying on the number of miles...
The focus is on the experience, there are 48V light mix this worker, first of all, the vibration amplitude and starting speed of the start-stop system have been greatly optimized, coupled with the ANC active noise reduction function, in the congested road section your mind can get greater relaxation, no longer need to silently read peace and love, the motor can not play a driving role like HEV and PHEV models, it is an auxiliary, and it is a good assistance, especially in the power switch, engine shift, can make the power performance without break, Even with more intense operation, it can have a more linear acceleration process.
Of course, it's a suit thug in itself, and the 2.0T turbocharged engine is placed on top of a small and medium-sized SUV, which is completely super-level, not to mention that it can also output 237 horsepower, it has extremely combat properties, and the roar of power will make you more active on your right foot.
In the experience process, even easy-going and gentle female drivers are willing to take the initiative to explore its limits, refreshing is still the same, it is equivalent to a patch for the old model, playing more smoothly on the basis of environmental protection, and there will be no shrinkage in performance.
My attitude is more clear, 48V light mix to improve the level of electrification of the entire car, but also to maintain the dignity of the internal combustion engine model, the German system in the promotion of 48V light mix technology more active, after all, this is a set of standards introduced by people, in a longer period of time, difficult to be replaced by the fuel vehicle can be through this compromise route to get more time for their own transformation, but also let us continue to enjoy the fun brought by the internal combustion engine.
Set up a flag, for a long time to come, 48V light mix system will become the mainstream, I bet a lollipop.