There are three main companies to contact in China. The first one is Toyota. Toyota's hybrid power has a long history, with a development history of more than 20 years. Global sales of more than10 million hybrid vehicles have enabled Toyota to dominate the hybrid vehicle market in the past two decades.
The second one is Honda. Although Honda has only focused on hybrid models in recent years, it is a latecomer after all and has performed well in all aspects.
The third company is BYD, without the technical accumulation and accumulation of the first two Japanese companies, starting from scratch, it is completely close to the continuous attempts and improvements in recent years, so as to achieve the status of the two major Japanese brands in the world.
First, Toyota THS hybrid power system
Toyota's hybrid technology is called THS for short. This THS hybrid technology should be mature by now. Toyota recently issued a patent for the core part of THS hybrid technology, and * * * enjoyed this hybrid vehicle technology that has dominated for more than 20 years.
Toyota's THS hybrid power technology uses two motors, with the engine as the output power, and adjusts the output power of the internal combustion engine and the motors through complex and ingenious planetary gear mechanisms, so that the internal combustion engine always stays in an efficient working range. When the vehicle is started, it is driven by the motor, which avoids the inefficient working area of the traditional internal combustion engine.
When the vehicle is driving under low load conditions such as cruising, the internal combustion engine works and the motor is stationary; When accelerating, the motor assists the internal combustion engine to work, saving fuel and obviously improving the driving experience; When the vehicle slows down, the motor can reverse charge the battery through kinetic energy recovery.
Second, Honda i-MMD hybrid power system
Due to the patent protection of Toyota hybrid planetary gear mechanism in previous years, the research and development of Honda hybrid power system has had a certain impact. Honda's i-MMD hybrid system completely bypasses Toyota's hybrid planetary gear mechanism, adopts PCU electronic module control, and adds a set of clutch to realize the coordination between motor and internal combustion engine.
Its overall power output idea is consistent with Toyota's hybrid, which is to make the internal combustion engine work in the most efficient working range as much as possible.
When the vehicle is started, it is completely driven by the motor; When driving at medium and low speed, the internal combustion engine charges the battery and the motor drives the vehicle; When driving at high speed, Honda's i-MMD hybrid system has a direct connection mode of internal combustion engine, which allows the internal combustion engine to directly drive the vehicle forward. At the same time, PCU will be more able to decide whether to let the motor participate in the work or use the power of internal combustion engine to charge the battery.
On the whole, Honda's i-MMD hybrid system is more flexible than Toyota's THS hybrid system, and its motor power and battery capacity are also larger, so it is relatively more inclined to motor-driven vehicles.
Third, BYD DM-i hybrid system
BYD's DM-i hybrid system has three motors, one of which is connected with the belt of the internal combustion engine, which is mainly responsible for the start-up and auxiliary afterburner when the internal combustion engine works. The other two motors are located at the front axle and the rear axle respectively, which directly drive the front and rear wheels of the vehicle. The internal combustion engine drives the front axle, so when the internal combustion engine works, the excess power can be reversed by the motor of the front axle to charge the power battery.
BYD's DM-i hybrid system is similar to Toyota's and Honda's hybrid systems, both of which are aimed at reducing the start of internal combustion engines as much as possible or making internal combustion engines work as efficiently as possible. The vehicle will travel in the best power distribution mode according to the current driving state and vehicle condition.