Introduction
Generation Ⅱ BYD the DM technique, by dress more efficient assembly TID robust, high speed motors, the motor controller integrated, safer iron batteries, etc. to achieve a more dynamic performance and better economic performance, the first vehicle equipped with this technology is the BYD Qin.
“BYD Qin”
This DMⅡ-generation hybrid technology still uses a parallel way, the difference is that the traditional power in part by a new the 1.5L turbocharged direct injection engine (currently mounted in speed and sharp G6) substituted in DMⅠ 1.0L naturally aspirated engine, and 6 speed dual clutch transmission of a single speed reducer alternatively before, more wide gear ratio, allowing natural power systems work in a dynamic range of more energy-efficient.
“Comparison of two generations of dual-mode technology.”
DMⅡ to by the previous generation 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.
“more compact high-speed high-power motors.”
In order to fit more powerful motor, DMⅡ on behalf of the voltage of the system from the original 330V raised to 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 simple terms, the higher its mass density and energy density, and has a more powerful charge and discharge capacity, so DMⅡ generation iron battery bodyThe product can be made smaller, so that also the trunk of the vehicle to leave more space (iron battery disposed within the sealed region between the rear seat and the trunk of the vehicle).
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As the brain mdash motor; mdash; motor controller also corresponding optimization, compared to the previous generation, which integrates the DC / DC converter, which 14V low voltage generator may be a conventional conversion to generate 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 the hybrid mode, the system will use 90 percentage pure electric mode (EV mode), will make the engine fuel mode to enter the case of 10 percent, so that the greatest degree of control logic can reduce vehicle fuel consumption, after all, today’s price far far below the price of oil, while the current official one hundred kilometers fuel consumption of only 2L.