Yutong sanitation - two-speed DAT assembly
The Yutong pure electric cleaning vehicle is equipped with a Wanrun dry friction external control automatic transmission ( DAT). As the flagship product of Fujian Wanrun, DAT transmission is a new type of transmission with complete intellectual property, originality and independent development. The assembly's maximum output torque is 5,500 Nm. DAT's unique flexible power coupling mechanism greatly improves the stability of the vehicle and makes the vehicle more durable.
Yutong sanitation - two-speed DAT assembly
Wanrun DAT structure is divided into two parts: one is a flexible coupling mechanism, which is composed of proven and stable dry clutches and brakes on the traditional vehicle; the other part is the transmission component, which consists of planetary rows; the two-part structure realizes wet and dry Separate, and the shift control mechanism is externally placed to make the transmission assembly cavity smaller, reduce the amount of fuel, reduce the oil loss and improve the transmission efficiency.
DAT dry and wet separation configuration
Among them, the flexible power coupling mechanism is unique to DAT, which makes DAT have three characteristics.
The first feature: smooth shifting, power is not interrupted.
The motor speed and vehicle speed information during the DAT shifting process were intercepted for observation and analysis. The results showed that there was no vehicle speed fluctuation and power interruption during the shifting process.
There are five stages in the shifting process of the normal new energy vehicle transmission: untwisting - hanging neutral - speed regulation - cutting the target gear - twisting, the three processes from the withdrawal to the twisting, that is, the power interruption time. When the DAT is shifted, the clutch and brake of the flexible coupling mechanism can realize the semi-coupling state, the torque can be canceled to zero, and only the part is cancelled, the load of the clutch and the brake is reduced, and the two gears are partially overlapped by the semi-coupling state. , no need to go through the neutral gear when switching, to achieve uninterrupted power, resulting in better driving control and ride comfort.
DAT shifting process motor speed and speed information
The second feature: energy saving.
The main reason for DAT energy saving is the ability to achieve high braking energy recovery. Through the research on the braking energy recovery of different gears with supercapacitors as the vehicle energy storage device, the test data analysis, under the same working mode, also from 16km/h braking to 7km/h, judging the energy recovery situation, It turns out that when the vehicle is in the first gear and the second gear, the energy recovery is about 1/3, which means that a reasonable gear shifting during the braking process will increase the energy recovery space by 30%.
DAT can realize gear shifting without interruption, which can be done during the driving process. It can also be done during the braking process, so the gear can be switched reasonably during braking to recover more braking energy.
In the case of a transmission with power interruption, if the shifting during braking means that the electric brake suddenly disappears, the gear position is generally not switched during braking, and the braking energy recovery is relatively small.
Using supercapacitors as accumulators - braking energy recovery in different gears
The third feature: stable and reliable.
The fault comes from the internal shifting mechanism, 20% of the faults come from the external shifting mechanism, and 20% of the faults are caused by the motor speed regulation and twisting problem. The stability of the shifting mechanism and the high requirements for the motor speed regulation and twisting have become new. The source of energy vehicle transmission failure.
DAT uses the proven clutches and brakes of conventional vehicles to reduce the failure rate of the shifting mechanism; and because of the introduction of a flexible power coupling mechanism, the precision of the motor speed regulation and torsion is greatly reduced, and the failure rate of the DAT is effectively reduced. .
Another aspect is to improve the wear and tear of other parts of the vehicle. After sampling the new energy vehicles that were put on the market in the early stage, it was found that the two new components of the new energy vehicles are relatively worn compared with the traditional ones, namely the tires and the spiral bevel gear rear axle. This should be a consensus in the industry, but currently There is still no good method of data support and avoidance.
Tire loss: A bus company in Fujian counted the loss of various models throughout the year and quantified it. It can be found that the tire wear of the pure electric direct drive system is nearly twice that of the conventional one, and the DAT system with the flexible coupling mechanism has the same degree of tire wear as the earlier hybrid, which can greatly reduce the tire wear of the pure electric vehicle and reduce the vehicle use. cost.
Spiral bevel gear rear axle: The stable and reliable rear axle used in traditional vehicles will be relatively poor in terms of noise, wear and stability after being applied to new energy vehicles. After the introduction of the flexible coupling mechanism, the rear axle wear has been greatly improved, effectively extending the life of the transmission system gear.
Tire wear of various models of a bus company in Fujian Province throughout the year
DAT transmission is a major technological breakthrough in the field of core components of new energy vehicles. It has formed a complete product series, which can be applied to passenger cars, special vehicles and passenger vehicles, including Yutong Heavy Industry, Xiamen Jinlong, Xiamen Golden Brigade, Nanjing Jinlong, Dongfeng series and other users are favored and affirmed.
In recent years, from the Xiamen BRIC meeting, the Huawei China Ecology Conference to the 2nd Digital China Summit to the 70th National Day military parade and other domestic and international grand events, Fujian Wanrun's product quality and service level have frequently won the attention and recognition of the outside world. . In the future, Wanrun will continue to innovate technology and services to help the green transportation industry more events.
Fujian Wanrun New Energy Technology Co., Ltd.
Fujian Wanrun creates quality with ingenuity and is committed to building smart, energy-saving and efficient power system products. It is steadily and steadily. While continuously learning from experience, it strengthens its independent research and development capabilities, actively implements innovation-driven strategies, and promotes production automation and product intelligence. To lay a solid and intelligent foundation for becoming a component "smart" enterprise.
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