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.

Augmentation of Transient Stability Limit of a Power System by Automatic Multiple Application of Dynamic Braking

Abstract: Dynamic braking is known to be a powerful method of augmenting transient stability margins. Investigations of analytical studies supported by experimental verification using micro-machine model of a power system, are presented. A simple strategy based on speed deviation signal has been developed and successfully utilized for automatic single or multiple insertion of braking resistor, whenever required. The stability limit for a transient three phase fault is found to be appreciably raised. A fair degree of agreement between the analytical and experimental results enhances confidence in their reliability.

Braking distribution system for a multi-axle vehicle making allowance for background braking

Abstract: An electronically controlled braking system wherein improved braking distribution in a multi-axle vehicle is achieved by making allowance for sources of background braking by assessing through measurement the total background braking force and assigning this in a predetermined proportion between the vehicle axles.

Brake device for vehicle and brake control program for vehicle

Abstract: PROBLEM TO BE SOLVED: To provide a brake device for a vehicle capable of miniaturizing and reducing the weight of a hydraulic brake device and compensate insufficiency of braking force due to fluctuation of regenerative braking force by a regenerative brake device when regenerative braking force fluctuates by hydraulic braking force by the hydraulic brake device. SOLUTION: This brake device for the vehicle is provided with the hydraulic brake device capable of giving control hydraulic braking force to a wheel corresponding to a wheel cylinder by giving control liquid pressure formed by driving a pump irrespective of brake operation to the wheel cylinder, the regenerative brake device for generating regenerative braking force corresponding to a brake operation condition detected by a brake operation condition detection means for detecting a condition of brake operation in the wheel by a motor driving any of the wheels, and a braking force compensation means for compensating insufficiency of braking force due to fluctuation of regenerative braking force. COPYRIGHT: (C)2006,JPO&NCIPI

Active Braking Control System Design: The D $^{\bf 2}$ -IBC Approach

Abstract: In modern road vehicles, active braking control systems are crucial elements to ensure safety and lateral stability. Unfortunately, the wheel slip dynamics is highly nonlinear, and the online estimation of the road–tire conditions is still a challenging open-research problem. These facts make it difficult to devise a braking control system that is reliable in any possible situation without being too conservative. In this paper, we propose the data-driven inversion-based control approach to overcome the above issues. The method relies on a 2-DOF architecture, with a linear controller and a nonlinear controller in parallel, both designed using only experimental data. The effectiveness of the proposed approach against state-of-the-art braking control is shown by means of an extensive simulation campaign. A validation test on a commercial full-fledged multibody simulator for two-wheeled vehicles is also provided.

Cooperative regenerative braking control for front-wheel-drive hybrid electric vehicle based on adaptive regenerative brake torque optimization using under-steer index

Abstract: In this study, cooperative regenerative braking control of front-wheel-drive hybrid electric vehicle is proposed to recover optimal braking energy while guaranteeing the vehicle lateral stability. In front-wheel-drive hybrid electric vehicle, excessive regenerative braking for recuperation of the maximum braking energy can cause under-steer problem. This is due to the fact that the resultant lateral force on front tire saturates and starts to decrease. Therefore, cost function with constraints is newly defined to determine optimum distribution of brake torques including the regenerative brake torque for improving the braking energy recovery as well as the vehicle lateral stability. This cost function includes trade-off relation of two objectives. The physical meaning of first objective of cost function is to maximize the regenerative brake torque for improving the fuel economy and that of second objective is to increase the mechanical-friction brake torques at rear wheels rather than regenerative brake torque at front wheels for preventing front tire saturation. And weighting factor in cost function is also proposed as a function of under-steer index representing current state of the vehicle lateral motion in order to generalize the constrained optimization problem including both normal and severe cornering situation. For example, as the vehicle approaches its handling limits, adaptation of weighting factor is possible to prioritize front tire saturation over increasing the recuperation of braking energy for driver safety and vehicle lateral stability. Finally, computer simulation of closed loop driver-vehicle system based on Carsim™ performed to verify the effectiveness of adaptation method in proposed controller and the vehicle performance of the proposed controller in comparison with the conventional controller for only considering the vehicle lateral stability. Simulation results indicate that the proposed controller improved the performance of braking energy recovery as well as guaranteed the vehicle lateral stability similar to the conventional controller.