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.

Commercial vehicle braking system for co-ordinated braking

Abstract: When the brake actuator is operated, the driver obtains a dynamic vehicle value factor influencing a braking operation so that, depending on the desired deceleration, the driver imposes control on the brake (43) and/or retarder brake (42) and/or service brake (41) by a control device so as to adjust the maximum, non-locking vehicle deceleration in all operating and loading conditions The dynamic value factor of the vehicle should include vehicle speed, acceleration, wheel speed, wheel slippage and yawing speed The sensors determining the dynamic value of the vehicle comprise those for vehicle speed (31), acceleration (32), wheel speed (33), slippage (34) and yawing speed (35) The sensors are responsible as a function of dynamic value factor and brake actuation for matching up the respective vehicle brakes as specified

Braking Torque Closed-Loop Control of Switched Reluctance Machines for Electric Vehicles

Abstract: In order to promote the application of switched reluctance machines (SRM) in electric vehicles (EVs), the braking torque closed-loop control of a SRM is proposed. A hysteresis current regulator with the soft chopping mode is employed to reduce the switching frequency and switching loss. A torque estimator is designed to estimate the braking torque online and to achieve braking torque feedback. A feed-forward plus saturation compensation torque regulator is designed to decrease the dynamic response time and to improve the steady-state accuracy of the braking torque. The turn-on and turn-off angles are optimized by a genetic algorithm (GA) to reduce the braking torque ripple and to improve the braking energy feedback efficiency. Finally, a simulation model and an experimental platform are built. The simulation and experimental results demonstrate the correctness of the proposed control strategy.

Energy management for hybrid electric vehicle during trailer sway

Abstract: Systems and methods for stabilizing a hybrid electric vehicle ("HEV") towing a trailer. One system includes a regenerative braking system, a non-regenerative braking system, and a stabilization system. The stabilization system determines a direction of rotation and a speed of the HEV and compares the HEV's speed to a predetermined low speed threshold value and a predetermined high speed threshold value. The stabilization system instructs the regenerative braking system to brake at least one wheel when the speed is less than or equal to the predetermined low speed threshold value and instructs the regenerative braking system to brake at least one wheel opposite the direction of rotation and at least one of the regenerative braking system and the non-regenerative braking system to provide an extra stabilizing braking torque to at least one wheel opposite the direction of rotation when the speed is greater than the predetermined high speed threshold value.

Electric motor dynamic braking energy recuperating system

Abstract: To provide for high efficiency of recuperation of energy stored in the rotating and electromagnetic system of a dynamo electric machine, upon dynamic braking thereof, in which the dynamo electric machine is connected in a chopper-controlled series circuit, a field diode (10) is connected across the field winding (11); a controlled switch (18), for example a transistor or a thyristor, is connected to the junction between the field winding (11) and the aramature (12, 13) and a return line (N) to a storage battery, the controlled switch being controlled to close by a control circuit (19) which opens a brake switch (16) connected between the battery and the dynamo electric machine series circuit under motor operating conditions, to provide for continued current flow through the field, which then is reversely connected by a field reversal switch (8, 9), with continued current flow being maintained by a free-wheeling diode (10) connected across the field. The chopper may be a thyristor (2) connected to a turn-off circuit, the turn-off capacitor (4) also furnishing initial field current through the controlled switch (18) or it may be a transistor (2') which is energized to conduction with a slight delay with respect to closing of the controlled switch (18).

Torque control allocation based on constrained optimization with regenerative braking for electric vehicles

Abstract: This paper proposes a constrained optimization-based torque control allocation method aimed to improve energy efficiency, and thus, driving range for electric vehicles. In the proposed method, the cost function is defined not only to achieve desired yaw moment for vehicle handling and stability, but also to minimize power losses for energy efficiency. The particular attention is paid to the power losses due to tire slips both longitudinally and laterally. The constraints are also set based on thorough investigation on various causes of power disppation such that the torque is allocated with restraint to use regenerative braking in its maximum capacity. The proposed control allocation method has been tested and verified to be effective on energy efficiency improvement through both simulation and experiment under various driving maneuvers.