Dynamic braking

About: Dynamic braking is a research topic. Over the lifetime, 3472 publications have been published within this topic receiving 34897 citations. The topic is also known as: Rheostatic brake.

Research on Modeling and Control of Regenerative Braking for Brushless DC Machines Driven Electric Vehicles

Abstract: In order to improve energy utilization rate of battery-powered electric vehicle (EV) using brushless DC machine (BLDCM), the model of braking current generated by regenerative braking and control method are discussed. On the basis of the equivalent circuit of BLDCM during the generative braking period, the mathematic model of braking current is established. By using an extended state observer (ESO) to observe actual braking current and the unknown disturbances of regenerative braking system, the autodisturbances rejection controller (ADRC) for controlling the braking current is developed. Experimental results show that the proposed method gives better recovery efficiency and is robust to disturbances.

Braking system for electric railcars including means for controlling electric brake force

Abstract: A braking system for an electric railcar having an a.c. motor with a variable voltage variable frequency inverter. The inverter controls the voltage and frequency supplied to the a.c. motor in response to the railcar speed, commands from the cab, load conditions, etc. The braking system also includes a pneumatic brake which operates at low speeds. A control circuit operates the inverter to supply electric braking down to a slow speed and then simultaneously applies electric braking and pneumatic braking, smoothly increasing the pneumatic braking force until the railcar stops. During the transistion from electric braking to pneumatic braking the control circuit maintains an output frequency from the inverter to the a.c. motor in the vicinity of 0 Hz, keeping the voltages in the positive phase range.

Combined motor vehicle braking system operating method, involves performing brake force distribution in range of reduced deceleration such that part of braking force on vehicle wheels of rear axle is greater than braking force of front axle

Abstract: The method involves determining braking intention of a driver, and performing brake force distribution for hydraulically actuatable wheel brakes. The brake force distribution in a range of reduced deceleration is performed such that a part of braking force on vehicle wheels of a rear axle is greater than the braking force on vehicle wheels of a front axle. The part of the braking force on the vehicle wheels of the rear axle is exclusively produced by an electric motor in a generator mode.