BYD has been granted a patent for a vehicle braking method that involves obtaining vehicle state information, calculating the required braking torque, and controlling the vehicle to output an electric braking torque. The method also includes calculating an electric braking exit speed and unloading the electric braking torque when the current vehicle speed is below a certain threshold. GlobalData’s report on BYD 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 BYD, battery management systems was a key innovation area identified from patents. BYD's grant share as of September 2023 was 70%. Grant share is based on the ratio of number of grants to total number of patents.

Braking method for a vehicle using electric braking torque

Source: United States Patent and Trademark Office (USPTO). Credit: BYD Co Ltd

A recently granted patent (Publication Number: US11752987B2) describes a braking method for vehicles. The method involves obtaining various state information about the vehicle, such as its mass and the deceleration required for braking. Based on this information, the method calculates the braking torque required by the vehicle and controls the vehicle to output an electric braking torque accordingly.

Additionally, the method involves obtaining the current vehicle speed and an electric braking exit protection speed. Using the calculated braking torque and the deceleration required for braking, the method calculates an electric braking exit speed. If the current vehicle speed is less than the larger value between the electric braking exit speed and the electric braking exit protection speed, the method controls the vehicle to unload the electric braking torque.

The patent also includes provisions for determining whether to unload the electric braking torque and apply a mechanical braking torque based on the current vehicle speed, braking torque required by the vehicle, deceleration required for braking, and the current gradient. If the current gradient is not zero, the method calculates a mechanical braking application speed and applies the mechanical braking torque if the current vehicle speed is less than this speed.

The patent further describes the use of a hydraulic brake system to provide the mechanical braking torque. In this case, the method obtains additional state information about the vehicle, including the kinetic friction coefficient, brake disc radius, and clamp port area. The hydraulic brake system is then controlled to apply the mechanical braking torque based on the unloading rate of the electric braking torque, the first state information, and the second state information.

Overall, this patent presents a comprehensive braking method for vehicles that takes into account various factors such as vehicle mass, deceleration required for braking, current vehicle speed, and gradient. By combining electric and mechanical braking torques, the method aims to optimize the braking performance and ensure safe and efficient vehicle stopping.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

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.