Pacific Auto Network is different. At present, the mainstream hybrid power on the market is divided into two types. One is the hybrid of oil and electricity, with the internal combustion engine assembly as the main part and electrification as the auxiliary part. The representative is Toyota's THS hybrid, but Honda's third-generation i-MMD hybrid system has a faint trend of shine on you. The other is the DM hybrid represented by BYD, with the electrification assembly as the main part and the internal combustion engine as the auxiliary part. These two hybrid technologies represent two different technical routes.
At present, the third generation BYD DM hybrid is not as practical as Toyota THS hybrid, mainly because its universality is not as good as Toyota's.
Toyota THS hybrid technology principle There are many articles about the principle of THS hybrid, the full name of which is ToyotaHybridSystem. Simply put, the key and wonderful point of this technology is ECVT, which skillfully combines the engine and two motors through the planetary gear set to provide power for the vehicle. In addition to ECVT, the engine is also a secret of Toyota's hybrid fuel economy. Because the motor is used to drive at low speed, the engine is used only when the speed comes up, and the Atkinson cycle engine can be in the best efficiency range as far as possible, so THS can achieve lower fuel consumption, and the more blocked it is, the more economical it is. However, the performance of this powertrain at high speed is not as good as Honda's third-generation i-MMD hybrid system.
BYD's principle of DM hybrid technology Compared with Toyota's complex planetary gear structure, BYD's DM hybrid is relatively simple. It adopts "parallel" hybrid structure, that is, the motor and engine are in parallel structure, and the power output is independent of each other. Similar to the parallel circuit, the motor power and engine power can be superimposed and output, so the explosive power is stronger. The third generation BYD has added BSG motor, which has greatly improved its efficiency.
BYD's DM hybrid development history In 28, the first generation of BYD's DM dual-mode hybrid technology was born, but this generation of DM can't be compared with Toyota's THS at all. The actual output power of the dual-motor hybrid structure is limited by electricity, but this is the first step of BYD's genius.
In p>213, BYD officially launched the second generation of DM technology, which is based on multi-speed DCT gearbox to build a parallel structure. The scheme is relatively simple and rude, but the full-time electric four-wheel drive, with an acceleration of less than 5 seconds, consumes less than 2 liters of fuel, which is called the "542" black technology benchmark, laying BYD's position in the industry in one fell swoop. However, this generation of DM technology has been dubbed as "a dragon with electricity, a worm without electricity; Ferrari with electricity, tractor without electricity. " The driving experience and fuel consumption are relatively poor when feeding, and there is still a low-speed setback in the dual-clutch gearbox.
in p>218, the year of the butterfly change of BYD's DM technology, coupled with the high-power and high-voltage BSG motor directly connected with the crankshaft, is a revolutionary change, which has promoted the power, efficiency and ride comfort of this power system to a new height.
at low speed, the BSG motor generates electricity through the engine belt. at this time, the vehicle is similar to Honda's IMMD hybrid, and the engine is always in the highest efficiency working range.