Mitsubishi Motors has patented a driving force adjusting device featuring dual electric motors, a differential mechanism, and drive shafts. This device is designed to optimize torque distribution between the vehicle’s wheels, ensuring that its resonance frequency during turns exceeds the vehicle’s yaw resonance frequency for improved stability. GlobalData’s report on Mitsubishi Motors gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Mitsubishi Motors, HEV energy management was a key innovation area identified from patents. Mitsubishi Motors's grant share as of July 2024 was 51%. Grant share is based on the ratio of number of grants to total number of patents.
Driving force adjusting device for vehicle wheels
The granted patent US12071024B2 introduces a driving force adjusting device designed for vehicles, which incorporates a pair of electric motors to drive the left and right wheels. This device features a differential mechanism that allows for a torque difference between the wheels, along with left and right drive shafts that transmit the driving force from the differential to the wheels. Notably, the device is characterized by four elements and two degrees of freedom. A key aspect of its design is the adjustment of inertia moments along the paths from the electric motors to the wheels, ensuring that the resonance frequency of the device during vehicle turns exceeds the yaw resonance frequency of the vehicle.
Additionally, the patent outlines a method for designing this driving force adjusting device. This method involves calculating the inertia moments based on various factors, including the motor inertia moments of the electric motors, the gear ratio of the differential mechanism, and the angular acceleration ratio of the wheels. The resonance frequency can be further refined by considering the stiffness of the drive shafts and the inertia moments of both the drive shafts and the wheels. This comprehensive approach aims to enhance the performance and stability of the vehicle during operation, particularly when navigating turns.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
