Create double ＂world-class＂ records, Roewe DMH super hybrid technology refreshes the upper limit of value.

On November 8th, the Roewe iMAX8 DMH Xinluzun and D7 DMH World Champion Edition were officially launched. With the empowerment of DMH super hybrid technology, two new cars have handed over their bright "report cards", marking another "milestone" moment for the development and application of China’s own brand hybrid technology.

Recently, when SAIC Roewe product experts visited the "DMH Technology Cloud Classroom", they revealed in detail that the Roewe D7 DMH World Champion Edition "can break the Guinness World Record without relying on a large fuel tank" and the Roewe iMAX8 DMH New Land Zun achieved the "world’s longest battery life and lowest fuel consumption MPV".

The key to the continuous breakthrough of product strength is how to improve the efficiency of the whole hybrid system. Hardware innovation is the foundation, and software algorithms and hardware can work together to maximize their effectiveness. As the product of SAIC’s research and development in the field of hybrid technology for more than ten years, DMH super hybrid technology is based on the simultaneous open source and throttling of software and hardware, and super fusion, thus achieving the optimal solution of hybrid power.

Hardware "open source and reduce expenditure": to maximize operational efficiency

The "open source and throttling" at the hardware level needs to improve the thermal efficiency of the engine, give full play to the energy of every drop of oil, and at the same time optimize the core components such as motor, gearbox and drive motor to improve the energy conversion efficiency and keep the engine working in an efficient range.

At present, domestic hybrid technologies are in full bloom and the routes are different. Roewe DMH adopts P1+P3 dual-motor configuration with both power and economy, which brings higher mechanical transmission efficiency, faster dynamic response and more efficient decision-making. In addition, the coaxial structure of the industry-leading engine and P1 motor can effectively improve the transmission efficiency and reduce the energy loss, and at the same time, the NVH performance is also improved by more than 10% compared with similar products with parallel shafts. At the same time, the P3 motor of direct-injection cold flat wire using the industry-leading Hair-pin10-layer flat wire technology has the highest efficiency of 97.5%, and the motor has a wide high-efficiency area, the comprehensive efficiency of WLTC is over 90%, the response time is only 0.2 seconds, and the power is always there.

The engine is like the "heart" of a hybrid system, and its "thermal efficiency" is a key index to measure the performance of the engine and the efficiency of draining fuel energy. For a long time in the past, Toyota has dominated the world in the field of engine thermal efficiency. In 2017, the highest thermal efficiency of its TNGA engine reached 41%, which shocked the world. Under the continuous attack of China’s own brand, this pattern has been completely broken. The Roewe 1.5T super-hybrid special engine adopts VGT variable cross-section turbocharging technology, EGR exhaust gas recirculation technology, deep Miller cycle technology, etc., so that the highest thermal efficiency reaches 43%, which fully demonstrates Roewe’s leading technical strength as a self-owned brand "national team".

Software "open source and reduce expenditure": highly integrated to achieve overall management

Both new cars are "record-breaking", which is also inseparable from the "open source and throttling" of DMH super hybrid technology at the software level. The traditional independent powertrain control system architecture is like a bloated organization. The engine control unit, body control module and transmission control unit are "independent", and even have mutual constraints or "internal friction" in the process of cooperation.

In order to achieve efficient cooperation and overall management, Roewe DMH innovatively put forward the concept of "vehicle energy domain management". Based on the integrated powertrain control system architecture, the vehicle energy is finely managed through the powertrain super brain PICU, which realizes the "five in one" functions of motor control, engine control, hybrid gearbox control, air conditioning thermal management and battery thermal management, and realizes "variable sharing" by "domain", saving 70% redundant components. In addition, the optimization of communication mode will increase the operation speed by 50% and make the dynamic response more fierce.

Thanks to PICU, the Powertrain Super Brain, the dynamic response time of Roewe D7 DMH World Champion is only 0.26 seconds, which not only speeds up overtaking, but also has lower fuel consumption and longer battery life. This is also the first time that an autonomous automobile company has broken the monopoly of foreign technology, innovatively developed a fully autonomous and high-precision mass-produced gasoline engine control system and applied it to the hybrid system.

Based on the "super fusion" of software and hardware, the DMH super hybrid system can provide five working modes: pure electric mode, series mode, full load mode, direct drive mode and energy recovery, so as to truly achieve "the power is strong and the province is saved" and ensure the best balance between power output and energy saving under various driving conditions.

At present, global hybrid has entered the "China moment". The DMH super hybrid technology has strongly empowered Roewe iMAX8 DMH Xinluzun and D7 DMH World Champion Edition to bring "the best choice" to home users, and will continue to set a benchmark for hybrid technology value in the future, helping China’s new energy vehicles to reach the top of the world.