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.

Design and validation of an MPC-based torque blending and wheel slip control strategy

Abstract: This article presents a braking control algorithm for electric vehicles endowed with redundant actuators, i.e. friction brakes and wheel-individual electric motors. This algorithm relies on a model predictive control framework and is able to optimally split the wheel braking torque among the redundant actuators, while providing anti-lock braking features (i.e. wheel slip regulation). It will be shown that, the integration of these two control functions together with energy metrics, actuator constraints and dynamics improves the control performance compared to state-of-art control structures. Additionally, experimental measurements recorded with our prototype vehicle demonstrate a precise wheel slip regulation and high energy efficiency of the proposed braking control methodology.

Maximise the Regenerative Braking Energy using Linear Programming

Abstract: Regenerative braking improves the energy efficiency of railway transportation by converting the kinetic energy into the electrical energy. In this paper, Linear Programming (LP) is applied to search for the train braking trajectory with the maximum Regenerative Braking Energy (RBE). LP takes the advantages of simplicity in modelling, efficiency in computation, flexibility in applications. Compared with a previously proposed model, the proposed LP optimisation model takes into account the speed limit constraints during the braking operation. Four case studies have been performed with different speed limits and initial braking speeds. While the maximum allowed braking time takes a key role for the RBE recovery, a threshold exists when the impact of maximum allowed braking time starts to become negligible. It has been demonstrated in this paper that LP is a robust and effective method to locate the optimal braking trajectory with the maximum RBE. The results of the optimisation are of significant interest for urban transportation systems where the regenerative braking is frequently applied. Future work of this paper is to investigate the optimisation of RBE in a more complicated scenario where the gradients are present and the motoring operation of train is allowed.

Braking system for an aircraft and a method of monitoring braking for an aircraft

Abstract: A braking system (1) for an aircraft which includes a by-pass control system (9) for activation when undemanded braking or loss of braking is detected The braking system (1) comprises: a brake pedal transducer (2) for generating a brake pedal actuation signal when a brake pedal (3) is applied; brake actuation means (5) for activating a brake (6) on receipt of a braking signal; braking pressure transducer means (7) for generating a braking output signal related to the braking force applied to the brake (6); primary processing means (4) in electrical communication with the brake pedal transducer (2) and the brake actuation means (5) and adapted to generate a braking signal on receipt of a brake pedal actuation signal; secondary processing means (8) adapted to receive the brake pedal actuation signal and braking output signal; and a bypass braking control system (9) adapted to receive the brake pedal actuation signal from the brake pedal transducer (2) and generate a braking signal in response to the brake pedal actuation signal The secondary processing means (8) is adapted to disable the primary processing means (4) and enable the bypass braking control system (9) on detection of undemanded braking or loss of braking from the brake pedal actuation signal and braking output signal

Electric vehicle control apparatus

Abstract: Disclosed is a control apparatus for an electric vehicle, and particularly the dynamic braking control in the event of ineffectual regenerative braking load. A dynamic braking chopper (14) is controlled at electric braking in at least three divided modes of stopping control, chopping control and full conduction control in correspondence to voltages of a filter capacitor (6). As a result, the electric braking operation can be shifted reversely from electric braking to regenerative braking, and vice versa, without opening a line breaker or applying an air brake even in the event of ineffectual regeneration and ultimate over voltage, whereby the domain of regenerative braking after the emergence of over voltage can be extended to the maximum, and consequently the torque variation can be suppressed and the operating life of such mechanical components as brake shoes and line breaker can be extended.