1.DM Ⅱ generation of hybrid technologies
Introduction
Generation Ⅱ BYD the DM technique, through more efficient dress TID robust assembly, high speed motors, integrated motor controller, battery and other safer iron to achieve a more dynamic performance and better economic performance, the first vehicle equipped with this technology is the BYD Qin.
This DMⅡ generation of hybrid technology still uses a parallel way, except that the conventional power part consists of a new 1.5L turbocharged direct injection engine (currently and is mounted on the speed sharp G6) substituted in DMⅠ 1.0L naturally aspirated engine, and 6 speed dual clutch transmission of a single speed reducer alternatively before, broader than the teeth, so that the power system can naturally be more work energy efficient power section.
DMⅡ to by the previous generation of dual-motor becomes a single motor, this new high-speed, high power motor maximum speed is 12000 rpm, maximum power of 110kW, maximum torque 200Nmiddot; m. In the electric mode, it can drive the vehicle travels 50km, up to 150km / h in speed, it also as a generator during vehicle deceleration and braking to charge the battery pack to recover energy.
When the internal combustion engine and the electric motor power superposition, the maximum power and maximum torque of the vehicle can reach, respectively 223kW and 440Nmiddot; m, 0 to 100km / h acceleration time of only 6.9 seconds, top speed 185km / h.
adapted for more robust motor, DMⅡ generation of the system from the original voltage raised to 330V 500V, greatly enhance the effectiveness of this hybrid power system. Hybrid system as an integral part of the battery pack, DMⅡ generations using newly developed BYD iron battery technology. In short, its energy density andHigher mass density, and has a more powerful charge and discharge capacity, so that a volume DMⅡ generation iron battery can be made smaller, so that also the trunk of the vehicle to leave more space (iron battery disposed in the rear of the vehicle the sealing region between the rows of seats and trunk).
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As the brain motor mdash; mdash; motor controller also corresponding optimization, compared to the previous generation, which integrates the DC / DC converter, which may be a conventional 14V low voltage generated by the generator is converted into a high voltage of 500V for the air conditioning system, but also can be converted into a 500V 14V voltage for the vehicle and a low-voltage electrical appliances used to charge the battery. This mass and volume of the motor controller are further compressed, while the degree of protection has also been improved.
Finally, again briefly about this hybrid system operating logic, since this hybrid system can charge the battery pack through the external power supply, so in the hybrid mode, the system 90 percentage pure electric mode (EV mode), the case of 10 percent will make the fuel entering the engine operating mode, this can be the greatest degree of control logic to reduce vehicle fuel consumption, after all, today’s price is far below the price of oil, while the current official 100 km fuel consumption of only 2L.