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.

Torque-vectoring stability control of a four wheel drive electric vehicle

Abstract: The electrification of the automotive powertrain provides completely new control options regarding the distribution of individual wheel moments. The integration of up to four independently controlled electrical engines in a vehicle allows individual adjustment of driving and braking torques to the current driving situation. Thus, electrical engines create a new kind of dynamic vehicle control. Unlike the Electronic Stability Control (ESC), Torque-Vectoring influences the vehicle dynamics not only through braking forces but also by setting up positive driving torques allowing for a new way of dynamic driving. In this paper two different control algorithms are developed in order to calculate a desired yaw moment to influence vehicle dynamics. The Torque-Vectoring algorithm distributes the yaw moment among the four wheels. The evaluation of the vehicle dynamic simulation has shown that the best results regarding the control quality can be reached by using the Fuzzy control algorithm to optimize the driving stability in extreme driving situations.

Dynamic Impact Factors for Simply-Supported Bridges Due to Vehicle Braking

Abstract: Previous studies have shown that the dynamic impact factors of bridges caused by vehicle braking may exceed those prescribed in the bridge design codes. While simple vehicle and bridge models were used in most of the previous studies, a three-dimensional vehicle-bridge coupled model was developed in this paper to study the dynamic impact factors for bridges due to vehicle braking. This model is able to deal with more complex bridge structures than most of the existing models in the literature and can produce more reasonable results. Considerable dynamic effects were observed on the bridge responses as well as on the contact forces between the bridge and the vehicle due to vehicle braking. The effects of several important parameters, including the vehicle braking position, deceleration rate, initial vehicle speed, and road surface condition, on the dynamic impact factors were studied. In addition, a comparison was made between the dynamic impact factors caused by vehicle braking and acceleration.

Method of controlling sensitivity of vehicle automatic braking process

Abstract: A method for determining the triggering sensitivity of an automatic braking process in motor vehicles. By a control element the driver can control within a specific range the threshold value which is effective for triggering. The permissible range is selected so that the effective threshold value can neither be reduced to such an extent that automatic braking is triggered at actuation speeds of the brake pedal which are normal for travel mode, nor increased to such an extend that it is impossible to trigger automatic braking process.

Dynamic braking system for electric drive

Abstract: A system for dynamically braking an electrically driven vehicle wherein a retarding means is directly coupled to the engine/generator drive and employed to absorb the major portion of the energy produced during power regeneration. Running at near rated engine speed, the retarding means generates substantially constant braking torque during vehicle deceleration and associated control systems automatically operate the retarding means in response to command signals and employ circuits to maintain the excitation of generator below that of the wheel motors during retarding whereby better power transfer is effected.

Regenerative braking system in a motor vehicle

Abstract: A regenerative braking system in a motor vehicle determines a state of deceleration on the basis of the number of revolutions of a motor and an accelerator signal and performs a regenerative braking according to the state of deceleration. The regenerative braking system includes a revolution sensor for detecting the number of revolutions of a rotor of a vehicle driving motor and an accelerator opening sensor in a RAM stores discrimination data for discriminating between a regenerative braking mode and a drive mode on the basis of the number of revolutions of the rotor and the accelerator opening and also stores on-off duty ratio data of FETs in the regenerative braking mode and that in the drive mode. A CPU retrieves on-off duty ratio data corresponding to the number of revolutions of the rotor and the accelerator opening in the regenerative braking mode when the regenerative braking mode is determined on the basis of the rotor revolutions and the accelerator opening, and controls the FETs at an on-off duty ratio corresponding to the retrieved on-off duty ratio data.