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Use of Electric Driveline for a Cooperative Braking Strategy

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

NEVS-Mustafa Ali Arat, Hans-Martin Duringhof, Johan Hagnander, Eduardo L. Simoes
  • Journal Article
  • 2017-01-1595
Published 2017-03-28 by SAE International in United States
This paper presents a brake control strategy with a novel approach to the allocation of actuator effort in an electric vehicle. The proposed strategy relies on a combination of the conventional hydraulic braking system and the electric machine in order to improve braking performance. The higher response frequency of the electric machine is paired with the additional braking torque employed by the hydraulic brakes using an integrated control allocation strategy, which allows for a constant availability of a faster and more accurate modulation of both wheel torque and wheel speed. Therefore, the availability of an electric machine as a fast longitudinal actuator yields to an improved tracking of the desired wheel slip, especially when compared to the hydraulic actuators used in traditional braking applications. As a result, this strategy leads to a clear and considerable reduction of the braking distance, removes the need for a hydraulic modulator and thereby also removes the disturbing feedback on the brake pedal in hard braking maneuvers. The control algorithm is implemented and tested with numerical analysis using a plant…
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A Model-Based Approach for Investigating Tire-Pavement Friction Threshold Values

NEVS-Mustafa Ali Arat
Coventry University-Emmanuel Bolarinwa
Published 2017-03-28 by SAE International in United States
Most ground vehicles related accidents occur when the friction demand to perform a maneuver with a certain vehicle and tires exceeds the coefficient of friction of the pavement surface. As generally known, the forces and moments acting on the vehicle body are mainly generated at the tire-road surface interface. The common characteristics of tire forces on any surface include a linear region where the forces vary linearly with respect to the relative slip values; and a nonlinear region where the forces saturate and may even start decreasing. The experience of most of the daily drivers on the roads is limited within this linear region where the dynamic behavior of the vehicle remains proportional to the driver’s inputs. Therefore, an unexpected change in tire or surface characteristics (due to a change in surface friction, large driver inputs, etc.) may easily cause the driver to panic and/or to lose his/her ability to maintain a stable vehicle. These types of instabilities underline the importance of monitoring the corresponding tire and pavement attributes for improved vehicle performance and controls.…
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