1,721,167 research outputs found
Force-based braking control algorithm for vehicles with electric motors
No full textElectric motors offer the possibility to control the braking torque in a more precise way than the hydraulic circuit. The applied torque is in fact measured and so it can be used to feedback the controller. Moreover, this information can be used to estimate the tyre-road friction coefficient, before potential friction is reached. The present paper proposes a novel ABS control strategy for electric vehicles with distributed motors. The controller is a six states machine that uses the information on applied braking torque provided by the electric motors. This information is of paramount importance to understand when the wheel reaches the peak of the braking force. Simulation results shows the benefits of the proposed strategy, comparing the results with state of the art acceleration-based controller
A cooperative control strategy for yaw rate and sideslip angle control combining torque vectoring with rear wheel steering
Full text linkAutomobiles are becoming more and more complex as multiple control systems are integrated into the vehicle platform. This paper investigates the coordination of active rear steering (RWS) and torque vectoring (TV)–which is enabled by independent electric motors at the rear axle–in controlling vehicle lateral dynamics. The proposed controller aims at enhancing vehicle handling performance and stability while cornering. The coordination of the two actuators is achieved by weighting their contribution based on their impact on vehicle dynamics according to the working condition. The impact of each control system is assessed by means of phase portraits. These plots are a very powerful tool for analysing vehicle nonlinear dynamics as they readily display vehicle stability properties and map equilibrium point locations and movement to changing parameters and control inputs. Based on phase portrait analysis, a performance index is thus proposed, which weights more the control action (TV or RWS) capable of leading the vehicle at the nearest equilibrium point with the fastest rate. The controller performance is assessed through numerical simulations carried out using a nonlinear 14 dofs vehicle model. Results are compared with ones of the two controllers alone (RWS and TV) in different manoeuvers and adherence conditions
Torque vectoring control for different powertrain layouts of hybrid and electric vehicles
No full textIn recent years the need in energy saving in transportation raised the attention on alternative powertrain. The main competitor of ICE become electric motors. With this type of powertrain it is possible to drastically change the power train layout of a vehicle. It is in fact possible to equip the vehicle with more than one single motor. In this paper the author analyses the effectiveness of a control strategy for lateral dynamics applied on different powertrain layouts comparing the performance of each layout with respect to others and with respect to the passive equivalent vehicle
- …
