Honda has filed a patent application for an active diffuser that would deploy only when needed, keeping a vehicle's styling clean and uncluttered when it's not in use.
Rear diffusers are typically fixed in place, Honda notes in its patent application published by the United States Patent and Trademark Office on Feb. 6, but originally filed on Aug. 24, 2021. That creates a conflict between the need to design an effective diffuser and other considerations like styling, departure angles, and potentially even government regulations, according to Honda.
The solution proposed in the patent application is a rear diffuser that would slide out from a car's rear bumper using an actuator. When deployed, the diffuser would generate an upward flow of air from underneath the car, balancing the downward flow of air spilling off the roof and helping to reduce rear-end lift, the application says. Unlike a conventional diffuser, it would be stowed when not needed, so cars wouldn't have appendages sticking out past their rear bumpers.
Sedan and SUV buyers will likely be less tolerant of a vehicle that has trouble negotiating steep driveways due to low-hanging bodywork than buyers of purebred sports cars.in development as well, although such a vehicle has been rumored for some time with no confirmation of production plans from the automaker. Honda will begin launching a line of EVs developed in-house in 2026, starting with a sedan-type vehicle for North America.
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