SAIC’s “Zhi Ka Hui”: Exploring why DMH is “a plug-in hybrid technology with more long-term value”

"Smart brain", "agile body" and "strong heart". Earlier this year, at the SAIC "Smart Cafe" held in Shanghai, SAIC used these three aspects to summarize its technological advantages.

On November 6, at the second SAIC Group "Smart Cafe" held in Guangzhou, the core of communication was SAIC Group's new DMH super hybrid system.

In fact, SAIC is one of the first domestic independent car companies to enter the plug-in hybrid track. As early as 2010, SAIC Passenger Cars proposed three different technical paths for new energy (pure electric, PHEV and fuel cells). And that same year, the first plug-in hybrid product, the Roewe 750Hybird, was launched. In 2013, SAIC Group released the first-generation plug-in hybrid system. Subsequent plug-in hybrid models such as the Roewe e550 were a hot "new species" in the auto market that year.

For more than ten years since then, SAIC has continued to invest and iterate in self-research and development in the field of plug-in hybrid technology. Based on more than ten years of hybrid research and development accumulation, SAIC has launched a new generation of "most powerful hybrid" DMH super hybrid system.

The core technology of the DMH super hybrid system adopts the current market mainstream P1+P3 dual motor + 1st gear direct drive mode, and is equipped with a 1.5L hybrid dedicated engine, as well as an intelligent and efficient hybrid transmission with higher output power and integration. The box allows the vehicle to always maintain the optimal working mode during daily driving, achieve the longest battery life and the lowest fuel consumption, allowing consumers to enjoy lower vehicle costs.

The DMH super hybrid system adopts the industry-leading dual-motor mode and provides five drive modes: pure electric, series, full load, direct drive, and energy recovery. Different modes can allow the vehicle to get more power during daily overtaking and acceleration.

It is worth mentioning that Roewe DMH's industry-first powertrain brain PICU realizes "five-in-one integration" of motor control, engine control, hybrid transmission control, air-conditioning thermal management and battery thermal management functions. Not only does it increase the vehicle's computing speed by 50%, but the power response is only 0.26 seconds, which is twice as fast as competing products at the same level. In addition to strong acceleration capabilities, with the support of multiple technologies, the DMH super hybrid system can increase the engine thermal efficiency to 43%. At the same time, SAIC is already simultaneously researching the next generation hybrid, with a thermal efficiency exceeding 47%.

In fact, compared with these, it is better to talk about the product directly to make consumers feel more directly. We might as well talk about the first Roewe D7DMH equipped with a DMH system.

Compared with direct competing products, Roewe D7DMH has been optimized in many aspects. For example, the power of P1 and P3 motors is increased, and the industry's first five-in-one PICU increases the power response speed to 0.26 seconds, etc.

The direct feeling of this optimization is that the Roewe D7DMH drives more like a pure electric car that is extremely popular in the market today. It accelerates quickly and the speed-increasing process is relatively linear. At the same time, the optimization of five working modes, including the series-parallel connection of the engine and motor and the direct drive mode, has enhanced the vehicle's NVH performance and improved the noise control in the vehicle.

According to public data, compared with its direct competitor BYD   Qin PLUS ( parameter | inquiry ) DM-i, the Roewe D7 DMH has larger engine power, motor power and pure electric cruising range even though its body size and curb weight are larger than those of its rivals. Have a certain advantage.

The 1.5L hybrid-specific engine equipped in the Roewe D7 DMH has a maximum thermal efficiency of more than 43%, which is an industry-leading level. Optimization measures such as the coaxial design of the P1 motor have further improved the efficiency of the entire vehicle system.

The direct result of this is that fuel consumption is greatly reduced. A piece of evidence is that in the "2023 Hybrid Vehicle Extreme Challenge" previously held by the China Automotive Industry Center, the Roewe D7 DMH won the first place in the medium and large sedan group in the comprehensive performance and pure electric endurance test, and in the "fuel consumption on loss of power" In the test, Roewe D7 DMH won the double championship with a performance of 4.61L per 100 kilometers.

Previously, SAIC mentioned that it would turn the price war into a technical war to build its own "technical moat", and the DMH super hybrid system, known as "a plug-in hybrid technology with more long-term value", may become an important technology for SAIC in the future. cornerstone and give the market more surprises.