Mercedes-Benz has decided to discontinue its trials involving range-extender drivetrains, a technology that incorporates a combustion engine adapted as a generator to charge the battery when needed. Despite initial tests and an advanced engineering program focused on this technology, the German automaker has chosen to shift its focus towards more straightforward and cost-effective battery-electric drivetrains.

The decision to abandon range-extender technologies was prompted by the understanding that these drivetrains represent a transitional technology with limited long-term benefits in terms of sales and come with relatively high production costs. Mercedes-Benz had explored this technology through various prototypes, including an EQS-based mule that featured a front-mounted 1.0-liter two-cylinder turbocharged engine specifically designed to operate as a generator without directly driving the wheels.

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This special combustion engine was optimized with Miller-cycle thermodynamic prototypes to enhance constant-rev efficiency and was combined with a rear-mounted electric motor and lithium-ion battery for propulsion. The prototype could be charged through traditional AC and DC plug-in methods, while the two-cylinder range extender was intended to generate backup electricity in situations where traditional charging was unavailable.

Despite the cancellation of the range-extender trials by Mercedes-Benz, this technology has gained traction in China due to the limited EV charging infrastructure in certain areas. Chinese automakers like Li Auto have capitalized on the popularity of range-extender models by incorporating them as alternatives to pure-electric drivetrains in their lineup. Li Auto, renowned for its range-extender vehicles, sold an impressive number of vehicles in 2023, all of which feature this technology to combat range anxiety and cater to markets lacking adequate charging infrastructure.

Ultimately, Mercedes-Benz's decision to move away from range-extender drivetrains underscores the shifting focus within the automotive industry towards dedicated battery-electric solutions, aligning with the brand's commitment to sustainability and future mobility solutions.

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