At the beginning of the listing publicity, the majority of netizens for the ideal ONE three-cylinder 1.2T engine spit is a lot, three cylinders do not say, 96 kilowatts of power relative to the ideal 2 tons of more than the hunk is too small, the efficiency is not good, anyway, it is not a good choice.
Although many people have always been skeptical about this engine selection, the increase in the actual driving experience of the ideal ONE has increased with the passage of time and more real car owners, at least from the recent monthly sales of more than 10,000 sales.
It seems that the engine is no longer a problem!
In the end, how to see this engine selection of the ideal ONE?
The following figure is a basic structural diagram of the ideal ONE extender that everyone on Earth knows.
How to evaluate this solution?
Four words, "decent"
Range extender (engine), generator, battery, electric motor, each component is arranged in turn, each performing its duties,
Nothing wrong with it or a highlight.
Seeing this solution you will never have the kind of surprise and admiration that comes into contact with Toyota THS for the first time, WC, what brain circuit can come up with such a design!
But, anyway, one thing we have to admit is that if we're going to switch to fuel cells,
Ideal ONE is one of the lowest cost solutions for technology switching,
No matter what THS, iMMD, DMi, DHT and the like, all have to redesign the power system.
The ideal ONE only needs to replace the part of the blue square grid above with a fuel cell, and even if the size is not a problem, it is possible to retrofit the vehicle that has been sold.
So if it is a fuel cell, how much power do you need to do?
This is a very worth thinking about, the ideal ONE is equipped with two electric motors that add up to 240kW, and the main force of output power depends on the battery. Fuel cells can directly drive the motor, but expecting fuel cells to do the main output is a bit too much and a waste of resources.
The work to be done by the fuel cell is actually two things, one is directly output to the motor to drive the vehicle forward at the right time, and the other is that the battery can be replenished at any time during the driving process to ensure the endurance of the vehicle.
As mentioned earlier, the main force is the battery, the fuel cell is a head, more points and less points are not a big problem, so its power demand is mainly considered to supplement the problem.
The ideal ONE battery pack capacity is 40kWh, this power is full, as long as it is not soaring at a high speed of 160, 180, running for 1 hour is certainly not a problem, if you make a 120kW fuel cell, 20 minutes can fill this battery pack (theoretical calculation), completely unnecessary.
In the end, how big to choose must be a comprehensive trade-off, simple calculation and analysis, radical then 40kW is enough,
Yes, only 40kW is required,
The driving power required for the 120 km cruise on the ideal ONE high-speed is about 30 kW, and if it is directly driven, it is not only enough to use it but also a little rich to replenish the battery, as long as the SOC planning is done, it can meet 99.99% of the working conditions. In this case, there is no need to choose a driving mode such as battery priority fuel priority.
Only in the special working conditions of continuous long-term high power consumption will there be insufficient light power consumption of the battery. Even so, if you park in place for 1 hour, you can be revived with blood.
To be conservative, 50kW or 60kW is more sufficient, but then the more important trade-off may not be the power size but the cost of different power fuel cells.
The conclusions drawn from fuel cells also apply to range extenders and generators, so Dongan's 96kW 1.2T engine is sufficient in terms of output power, of course, the maximum power of the engine is not equal to the best efficiency power, and the optimal efficiency power of the extended range engine is more important.
Thermal efficiency diagram of an engine
From the demand for fuel cells, we can roughly get the most suitable engine requirements for the ideal ONE,
The first power does not need to be too large,
The second range extender engine is mainly used for power generation and can operate stably at the optimal efficiency point, and the efficiency should be high enough.
Obviously, Dongan's 1.2T engine meets the requirements in terms of power, but the efficiency is a little worse.
Dongan official data, the maximum efficiency of this engine is 36%, the user evaluation is 32 ~ 33% thermal efficiency, considering the power generation loss, we calculate according to 30%.
Jokernojoking: Probably the most reliable article to date on the calculation of the energy consumption of the ideal one14 agrees · 3 Comments
essay
Looking at the industry benchmark BYD DMi, the advertised thermal efficiency of the plug-in hybrid special engine is 43%, assuming that the power generation efficiency of the two is similar, it is roughly estimated that BYD's real power generation efficiency is 36%, which will actually be higher.
On the surface, there is only a gap of 6 points, which is not big, but we have to actually calculate it
Suppose you need to generate 10.8 kWh of electricity,
The ideal ONE consumes the same amount of fuel heat as 36 kWh,
BYD consumes fuel thermal energy equivalent to 30 degrees of electricity,
The gap between this is 20%, and if BYD's power generation efficiency is measured accurately, this gap will inevitably be even greater.
What does this mean?
As long as the efficiency of the ideal ONE engine and generator can reach the level of BYD, its fuel consumption level can be 20% lower than the current level, from the current high-speed cruise 8.x to less than 7 liters, and the endurance will also increase.
This does not require advanced engine combustion theory and complex engine control systems, but only a more efficient engine under a single operating condition.
For the ideal, it may not be realistic to develop an extended range engine from scratch, but it is more to see if they can outsource the procurement of a suitable engine with high enough efficiency, power is not a problem, the key is efficiency, which is probably also the pain of a company's lack of core technology.
However, in terms of the technical performance of this Dong'an engine now, it is not too much to put forward higher expectations.
Therefore, the biggest shortcoming of the ideal power system combination is the engine, not power but efficiency,
Definitely not excellent,
Qualified, reluctantly!
It is rumored that the ideal has a new engine alternative, 1.5T four-cylinder, or the previous analysis, power is not a problem, the important thing is efficiency, if the efficiency is strong enough, the ideal is afraid that once again will face the old problem of too big gap between the new and old models.
The previous time solved the general, what will happen this time?