Kubota‘s patented electromagnetic valve control device regulates the swash plate angle in a hydrostatic continuously variable transmission. It uses feedback control with an environmental coefficient, limiting operations during a learning period. The device ensures precise control of motive power in the transmission system. GlobalData’s report on Kubota 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 Kubota, Autonomous harvesters was a key innovation area identified from patents. Kubota's grant share as of May 2024 was 35%. Grant share is based on the ratio of number of grants to total number of patents.
Electromagnetic valve control device for hydrostatic continuously variable transmission
The granted patent (Publication Number: US12013032B2) discloses an electromagnetic valve control device designed to regulate the angle of a swash plate in a hydrostatic continuously variable transmission device. This device utilizes at least one electromagnetic valve to adjust motive power from a driver, which is then combined with motive power from the hydrostatic continuously variable transmission device in a gear transmission. The control device includes a control signal generator, a coefficient determiner, and an operation limiter. The coefficient determiner determines an environmental coefficient during a learning period, while the operation limiter restricts operations of the electromagnetic valve and gear transmission during this period.
Furthermore, the patent details various configurations and functionalities of the electromagnetic valve control device, such as the use of pulse signals for control, machine-learning models for determining environmental coefficients, and the interaction with a gear transmission equipped with multiple clutches. The device also includes features like disabling external operations during the learning period and continuous updating of the environmental coefficient post-learning period. Additionally, the patent extends to a work vehicle incorporating this electromagnetic valve control device, enabling the vehicle to travel based on the motive power supplied by the gear transmission. Overall, the patent outlines a sophisticated control system for optimizing the performance of hydrostatic continuously variable transmission devices in work vehicles through precise electromagnetic valve regulation and feedback control mechanisms.
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