Toyota is quite persistent with hybrids, especially non-plug-in hybrids. Therefore, even in the development of pure electric power systems, this "hybrid" thinking is also in the shadow.
As in the previous article, "The fuel efficiency increased by 30%, the "special pet" mixed Toyota watch is wrong? As mentioned in the article, the internal combustion engine will still play an important role in the transition to pure electric vehicles. Therefore, even the injection-mixed Toyota did not give up the research on the engine. How to make the internal combustion engine continue to glow in the pure electric vehicle business is also one of the research directions of engineers.
It is under this guiding ideology that Toyota's Central Research Institute has developed a new type of generator with a power of 10 kW. Although this linear generator is a generator, it is transformed from the structure of the internal combustion engine. There is an unclear name - Free Piston Engine Linear Generator (hereinafter referred to as FPEG), free piston engine linear power generation. machine. The biggest difference from the traditional engine is the addition of a power generator to the cylinder.
Toyota expects a pair of 10 kW generators to allow a B/C class pure electric vehicle to cruise at speeds of up to 120 km/h. It should be known that for pure electric vehicles, the driving speed is always limited by the cruising range. Although many electric vehicles can have a top speed of more than 150 km/h, this number will be greatly reduced in order to get the maximum cruising range. So how does Toyota do it?
In fact, the principle of this new invention is quite simple, and it is also the physics knowledge in high school - electromagnetic induction.
We know that in a conventional internal combustion engine, the crank-link mechanism allows the piston to reciprocate in the cylinder, converting the chemical energy of fuel combustion into mechanical energy for output. In FPEG, a magnet is added to the outside of the piston. The reciprocating motion of the piston cuts the magnetic induction line generated by the magnet, and the external induction coil generates electromagnetic induction, which converts the kinetic energy of the piston movement into electric energy.
At present, Toyota Academia Sinica has only produced a prototype for experiments. The prototype was modified on a two-stroke cylinder consisting of a combustion chamber, a linear generator and a gas spring chamber.
Cylinder structure profile
In conventional engines, the key structure for the reciprocating motion of the piston to circulate is the crank linkage. In FPEG, since the mechanical energy is not directly output, and the magnet is added to the cylinder, the crank link structure is directly canceled. The magnet is attached to the piston, and in the original cylinder block, an induction coil and a stator embedded in the cylinder liner are added, and the magnet, the induction coil and the stator together form a linear generator. A linear engine can be thought of as a permanent magnet motor that can be used as both a motor and a generator.
The most critical structure in FPEG is a hollow piston. The diameters of the two ends of the piston are different. Among them, the small diameter end and the cylinder block form a combustion chamber, and the large diameter one and the cylinder together form a gas spring chamber. As can be seen from the above sectional view, the cross-sectional shape of the piston is a W, and Toyota also refers to this type of piston as a W-shaped piston.
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