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.

Adaptive regenerative braking control in severe cornering for guaranteeing the vehicle stability of fuel cell hybrid electric vehicle

Abstract: Front-wheel-drive electric vehicle has only 1 electric motor which is connected to the front drive axle. With this system constraint, regenerative braking by using an electric motor can be only applied on front wheels symmetrically. Additional mechanical friction braking can be independently applied on each of all wheels using brake by wire such as EMB (Electro-Mechanical Brake). During severe cornering with braking, excessive regenerative braking force distribution to the front axle for improving the fuel economy can cause the vehicle to approach its handling limit, i.e., if the front tires saturate first, the vehicle may plow out of the curve and is called to limit understeer. When the vehicle comes in a danger of crossing the limit, adaptive regenerative braking controller engages, assisting the driver to guarantee the vehicle stability. Controller can distribute an optimal regenerative brake torque and additional mechanical friction brake torques in order to prevent loss of control for the vehicle. Carsim™ software is used to verify the effectiveness of the proposed controller.

Method and system for braking in a wind turbine

Abstract: A braking system for a wind turbine is provided. The system includes one or more motors for driving a part of the wind turbine, a first group of brakes for braking the part of the wind turbine, and a second group of brakes for braking the part of the wind turbine. The first group of brakes is in a normally closed condition and the second group of brakes is in a normally open condition, so that a default brake torque can be selectively chosen that is less than a maximum brake torque.

Study on control strategy of regenerative braking for electric bus based on braking comfort

Abstract: The control strategy of regenerative braking energy is an important link in pure electric buses development. Because of the addition of motor braking in traditional mechanical braking basis, the total vehicle braking force under the same brake intention of drivers will vary, and this may change the braking comfort. Combining the maximum regenerative braking torque provided by motor and ECE braking regulations, the thesis chosen two regenerative braking control strategies, made modeling and simulation on them, and analyzed the braking comfort changes by them. Moreover, Regenerative braking control procedures have been writen by CoDeSys engineering software, carried out the tests, and compared the test data and simulation results.

The coordinated control of motor regenerative braking torques defined by accelerator pedal and brake pedal of electric vehicle

Abstract: Driver can operate accelerator pedal and brake pedal to control the driving force and the braking force exerted on vehicle. For electric vehicles, it is possible that the braking force can be controlled by manipulating the accelerator pedal because of the regenerative braking function. In this paper, fuzzy control theory is employed to calculate regenerative braking force during releasing accelerator pedal based on the accelerator pedal opening and its change rate. Two modes are designed to coordinate the braking forces defined by accelerator pedal and brake pedal. One mode is engine braking imitation mode, and the other is auxiliary braking mode. The simulation results show that engine braking imitation mode can provide the similar driving feel to internal combustion engine vehicle. Auxiliary braking mode changes the traditional driving habit, but it has much higher regenerative efficiency. Auxiliary braking mode is suitable for the city driving condition which has frequent braking requirement.

Vehicle braking force control device with feedback communication between wheels

Abstract: A vehicle braking force control device for executing a follow-up (or servo) control of braking force for individual wheels is improved for canceling the difference of braking force between left and right wheels especially during transient condition of braking force variation due to the difference of input-output response characteristics in braking force generating apparatuses and components associated therewith in a braking system. In the inventive control device, a relation between actual values of braking force on left and right wheels, such as the difference between braking force or pressure values on the left and right wheels, is fed back to these braking force generating apparatuses through the modification of target barking force or pressure values. The modification amounts of the target values may be determined so as to keep appropriate braking force distribution among front and rear wheels.