Directional Stability of a Front Wheel Drive Passenger Car with Preemptive Use of the Direction Sensitive Locking Differential (DSLD)

Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)


The topic of this paper is the bigger picture of vehicle dynamics and handling characteristics of cars, with a focus on driving safety. More specifically, the directional stability gain obtained using the semi-active differential (DSLD) is experimentally verified in transient steering maneuvers using a prototype in a FWD Saab 9-3 Aero.

Stemming from the obvious need to enable low speed maneuvering, the open differential was developed already in the beginning of the automotive era and it has ever since maintained a position as the unquestioned solution almost irrespective of the driving situation. However, due to the inherent compromise between low speed maneuverability and high speed stability in road vehicle design, there are fundamental benefits of locking the differential more or less preemptively during for example expressway driving.

In recent decades electronic stability control (ESC) has become the go-to solution to improve driving safety by increasing the directional stability in transient maneuvers. However, similar but significantly greater stability gains can be accomplished by utilizing controllable differentials. All in all this means that the mentioned inherent compromise between maneuverability and stability can be circumvented and the overall handling characteristics of cars can be fundamentally improved.


Direction stability Yaw damping Sine with dwell DSLD 


  1. 1.
    Alfredson, J.: Locking differential. United States Patent US 7,654,934B2, 2 February 2010Google Scholar
  2. 2.
    Lidberg, M., Alfredson, J.: Control of the direction sensitive differential (DSLD) for front wheel drive passenger car in transient cornering. In: Proceedings of the 21st International Symposium on Dynamics of Vehicles on Roads and Tracks (IAVSD 2009), Stockholm, Sweden, 14–18 August 2009 (2009)Google Scholar
  3. 3.
    Alfredson, J., Lidberg, M.: A method and a system for controlling the stability and yaw response of a vehicle by locking a differential at elevated speeds. Swedish Patent SE 539 607 C2, 17 October 2017 (2017)Google Scholar
  4. 4.
    Maeda, T., Irie, N., Hidaka, K., Nishimura, H.: Performance of driver-vehicle system in emergency avoidance. SAE Technical Paper 770130. SAE International, Warrendale, PA, USA (1977)Google Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Chalmers University of TechnologyGothenburgSweden
  2. 2.DsenseD Technology ABLerumSweden

Personalised recommendations