Research: BYD DM-I Super Mixing Platform of EHS Electricity System Technology Advantage

January 11, 2021, BYD released a new DM-I super mixing platform. A special high-efficiency engine (电 骁-1.混 专用 1.5L high-efficiency engine or inexplicrature-based special turbine boost 1.5Ti high-efficiency engine), 1 group consists of drive motor and generator “2” Dual motor EHS mixing system, 1 large-capacity high-power DM-I super mixed special power blade battery is mainly composed. Among them, the EHS electric mixing system as a core system of DM-I super mixing, and it has caused widespread attention.

This paper will be based on DM technology adopted by BYD on the F3DM model. After 13 years of technical and control strategy, the latest DM-I super mixed dual motor EHS is mixed after the model is used. The technical state of the system is studied and determined.

1. Technical advantages of the EHS electric mixing system:

High integration: EHS electric mixing system consists of dual motors, dual electrical control, direct drive clutch, motor oil cooling system, single gear reducer Composition, height integration, a reduction in weight by 30% compared to the first generation volume of 30 percentage.

Adaptation A to C-class models: EHS electric mixing system can be with 云–pply special 1.5L high-efficiency engine (maximum output power 81 kW, maximum output 135 cattle Mi) and 云–pply special turbocharged 1.5Ti high-efficiency engine (maximum output power 102 kW, 231 Nm) for modular combination. Therefore, the EHS electric mixing system can optionally be selected 132 kW, 145 kW, 160 kW drive motors and generators corresponding to different power levels, adapt to all models A to C-class, rich in configuration, Convenient user personalization.

The core technical advantage of the EHS electric mixing system is very highlighted: equipped with ultra-high speed motor, and the flat line design is used, minimizing motor volume (length and height) And self-weight, improve the torque density; the reducer uses minimal mining gauges to increase the transmission efficiency; and the motor uses advanced oil-cooling technology, greatly improves heat dissipation efficiency, so that the motor power density is increased to 44.3kw / L; simultaneous electric controlMatching autonomous fourth-generation IGBT technology, with a total of 98.5 percentage efficiency.

The previous new energy intelligence analysis network continuously released two “3-fitting 1” electric drive assembly that BYD’s own research and development of BYD, the maximum output power 160 kW (Adapted for EV models). The maximum output power of the drive motor used for the flat line design of the DM-I super mixing platform is only 160 kW, the maximum speed is increased to 16000 rpm, and the maximum efficiency of the motor is 97.5 percent.

The integrated drive motor and generator in the EHS mixing system are easily and Plug-in dedicated 1.5L high-efficiency engine or inexplica-in-chiral special turbocharged 1.5Ti high-efficiency engine is “embedded” engine compartment. Since the drive motor and the generator integrate the hardware level, the energy transfer path is reduced, and the transmission efficiency is high.

According to the personal experience of the author and the public information, it can be seen that in the electric drive system catalog of BYD, from the original

E6 (parameter) | Picture) Adaptated 90 kW level, 12000 rpm begins to gradually increase, to Tang EV (parameter | picture) adapted 180 kW, 15000 rpm adopts IGBT4.0 electronic control chip; then go to Han EV adaptation 200 kW, 15500 rpm, using SiC silicon carbide electronics. The flat line technology electrical drive system used in the EHS mixer system is also based on the experience innovation of up to dozens of electric drive systems accumulated in BYD more than 10 years of electric drive system.

Second, the Working Mode and Principle Analysis of the EHS Mixture:

BYD’s engineers use the scenario and working conditions to different use scenarios, HEV series, HEV parallel mode And the intelligent switching of the engine direct drive mode is optimized, and it is mainly designed with the traditional hybrid technique based on the traditional hybrid technology, which is mainly served from the high-power motor drive and the large-capacity power battery. For example, in the lossNext, the urban working condition will travel as the EV pure electric mode, the 81 percentage working condition engine stops running, 18 percentage working conditions The engine is in a high-efficiency area (HEV series mode), and finally 99% The motor is driven. Under the high-speed low load conditions of the loss of the loss, the engine is in high-efficiency zone as the main (according to the driving load state, dynamically adjusting the driving power); when it is at a high-speed overtaking or ultra-high speed, the system is switched to HEV In parallel mode, in parallel mode, drive motor parallel drive. In this mode, the assembly exploses the ultimate power performance, providing adequate push back, creating an excellent accelerated experience atmosphere.

Taking the NEDC operating calculation standard as an example, the loss of the EV pure electric mode of the EV pure electricity mode is as high as 70 percentage. Under the WLTC operating condition to be implemented in the next country, the loss of EV will also have 54%, and the total ratio is 28%; the integrated operating conditions can be seen that DM-I super mix really achieves electricity The Lord, the maximum degree of driving experience is unlimited close to the pure electricity.

In order to travel as much as possible in EV pure electric mode as much as possible, the DM-I super mixed special power type blade battery is loaded with the electric blade battery is 8.3- 21.5 degrees. The SOC value intelligent adjustment range is at least 4 degrees of electricity range within 4 degrees. Due to more power, the loss of the loss should be less than that In addition, the charging power of the DM-I super mixed special power blade battery is 2 times that of ordinary mixing batteries, and the internal resistance is lower, and the charge and discharge efficiency is superior to the conventional hybrid power 10%, and the energy recovery is raised to 30%. Can make up quickly.

Remarks: Relative to the power battery capacity of 1-5 degrees of power battery with energy-saving Japanese HEV model, adjustable SOC ranges from 50%, only in the range of 0.5-2.5 degrees Make schedule. Due to the extremely loaded capacity, the engine must operate or directly drive the vehicle for a longer period of time or for power generation or direct driving.

In the four types of drive patterns of the EHS, the engine is either running, or it is running in an efficient interval.For power generation, for charging driving (HEV series-driven vehicle while charging battery) and is used to drive directly. In EV pure electric mode, HEV series mode, engine either stop running or only responsible for power generation, will not be directly associated with the drive wheel. Therefore, the EHS electric mixing system under the Super DM-I hyperlighizing platform is characterized by electric drive, and fuel supplemented.

Third, the inheritance and breakthrough of the EHS mixer:

This EHS electric mix system originated from the F3 DM system developed previously 2008 BYD, design around high-power motor The drive and large-capacity power battery is mainly available, and the engine is a secondary electric mixing framework.

The upper graph is a dual motor drive system and energy stream using by the engine as the main power source; the right is right is

Qin (parameters | Picture) Plus DM-I uses electricity-based dual motor EHS electric mixing system and energy streamlined.

The 2008 annual production F3 DM continues to provide power for generators with 0.8 displacement engine, after converting the generator to power, or directly drive wheels directly by driving the motor, or drive the wheel at the same time Part of “rich” is stored to the power battery. It is also possible to bind to the clutch, driven by the engine, and control the engine operating in the highest efficiency, reducing engine fuel consumption.

The EHS electric mixing system is also used in parallel architecture, engine and drive motors to operate independently, engine and generators directly connected to direct drive clutches and drive motors. Partial connections, EV pure electricity, HEV series, HEV parallel and engine direct drive four major patterns.

Affected by the technical big outbreak bonus, Qin Plus DM-I was integrated with thermal efficiency at the DM-I super mixing architecture, the thermal efficiency reached 43.04% 骁 高 专 机The main EHS mixing system, large-capacity high-power DM-I super mixed special power blade battery. During most of the driving, the generator in the engine is directly associated with the generator in the EHS mixing system, and the conversion of power is used in the driving motor within the EHS mixing system.Drive wheel. Only under high speed steady state conditions, the engine is directly driven by the single stage reducer with the wheel through the clutch “release” with the generator.

The longitudinal alignment, the engine operation of the BYD F3 DM is widely located (comprehensive analysis, the engine speed “is from 800 rpm to 4200 rpm), which provides sufficient power quantity. Or driving or driving, it can be seen as a mixed technology based on the power output of the engine; the 云 秦 专 专 专 – 专 专 区 区 区 区 区 区 区 区 区 区 区 区 区 区 区 区The ratio reached 70 percentage (engine speed at 2000 rpm), and the power generator is provided by the generator for driving, which can be seen as a mixing technique mainly based on electric drive.

The author has something to say:

New design, a comprehensive upgrade EHS electric mix system, as a “big housekeeper” responsible for power coordination and allocation, it has a high integration of dual electrical control + dual motor Designed, large power, small size, light weight. At the same time, it is benefited from the adoption of the industry-leading flat line technology, oil-cold technology, and self-research IGBT technology, the maximum speed of 16000R / min, the motor is high, the efficiency is as high as 97.5%, and the higher than 90% of the high-efficiency zone accounts for 90.3%. The peak torque reaches 325 N · m, the peak power is up to 160kW, and the position is laid in the leading industry.

High efficiency is a major advantage of the EHS electric mixing system, which guarantees DM-I hyperlighizing system by distributing the intelligent power of the engine, generator and drive motor More work in high performance zones. From the key technologies to the driving mode, we can see the “high efficiency” two words to implement the EHS electric mixing system. Pingshun is its second feature, regardless of the electricity electricity, DM-I super mixing technology, does not need to change the EHS electric mix system, always in one gear, no chance to give any commences during the driving process, The driving experience is more delicate. It can be seen that in order to achieve DM-I super mixing with electricity-based technology, the EHS electric mix system does not.

Not complete. . . .

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