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Brake Steer Torque Optimized Corner Braking of Motorcycles

Schröter, Kai Gerd (2017):
Brake Steer Torque Optimized Corner Braking of Motorcycles.
Darmstadt, [Online-Edition: http://tuprints.ulb.tu-darmstadt.de/5985],
[Book]

Abstract

This thesis deals with the Brake Steer Torque (BST) induced stand-up tendency of Powered Two Wheelers (PTW) and measures to lower the associated risk for running wide on curve accidents with sudden, unforeseen braking. Focus is set on the BST Avoidance Mechanism (BSTAM), a chassis design that eliminates the BST through lateral inclination of the kinematic steering axis. A simple mathematical model is used to identify its main influences on the driving behavior and derive an optimized system layout. Its theoretical potential is evaluated against the standard chassis using different cornering adaptive brake force distributions and riding styles. For the first time ever, a motorcycle with state-of-the-art brake system (Honda CBR 600 RR, C-ABS) is equipped with a BSTAM and tested in corner braking experiments. Compared to the baseline, it is significantly reducing BST related disturbances and improving directional control. The gained insights can be stepping stones to enhance PTW safety by enabling future assistance systems with autonomous corner braking.

Item Type: Book
Erschienen: 2017
Creators: Schröter, Kai Gerd
Title: Brake Steer Torque Optimized Corner Braking of Motorcycles
Language: English
Abstract:

This thesis deals with the Brake Steer Torque (BST) induced stand-up tendency of Powered Two Wheelers (PTW) and measures to lower the associated risk for running wide on curve accidents with sudden, unforeseen braking. Focus is set on the BST Avoidance Mechanism (BSTAM), a chassis design that eliminates the BST through lateral inclination of the kinematic steering axis. A simple mathematical model is used to identify its main influences on the driving behavior and derive an optimized system layout. Its theoretical potential is evaluated against the standard chassis using different cornering adaptive brake force distributions and riding styles. For the first time ever, a motorcycle with state-of-the-art brake system (Honda CBR 600 RR, C-ABS) is equipped with a BSTAM and tested in corner braking experiments. Compared to the baseline, it is significantly reducing BST related disturbances and improving directional control. The gained insights can be stepping stones to enhance PTW safety by enabling future assistance systems with autonomous corner braking.

Place of Publication: Darmstadt
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Automotive Engineering (FZD)
16 Department of Mechanical Engineering > Institute of Automotive Engineering (FZD) > Brake Technology
16 Department of Mechanical Engineering > Institute of Automotive Engineering (FZD) > Driver Assistance
16 Department of Mechanical Engineering > Institute of Automotive Engineering (FZD) > Vehicle Dynamics
16 Department of Mechanical Engineering > Institute of Automotive Engineering (FZD) > Motorcycle
16 Department of Mechanical Engineering > Institute of Automotive Engineering (FZD) > Safety
Date Deposited: 19 Feb 2017 20:55
Official URL: http://tuprints.ulb.tu-darmstadt.de/5985
URN: urn:nbn:de:tuda-tuprints-59852
Additional Information:

Keywords: Motorcycle – Safety – Corner Braking – Chassis Design – Brake System – Assistance System – Brake Steer Torque (BST) – Brake Steer Torque Avoidance Mechanism (BSTAM) – Bremslenkmoment (BLM) – Bremslenkmomentverhinderer (BLMV)

Referees: Winner, Prof. Dr. Hermann and Lienkamp, Prof. Dr. Markus
Refereed / Verteidigung / mdl. Prüfung: 4 February 2015
Alternative Abstract:
Alternative abstract Language
In dieser Arbeit werden das bremslenkmomentbedingte Aufstellverhalten von Motorrädern und Maßnahmen zur Reduzierung des damit verbundenen Unfallrisikos durch Verlassen des eigenen Fahrstreifens bei unerwartet plötzlicher Kurvenbremsung behandelt. Im Fokus steht der Bremslenkmomentverhinderer (BLMV), ein spezielles Fahrwerksdesign, das das Bremslenkmoment (BLM) durch seitliches Schwenken der kinematischen Lenkachse vollständig kompensieren kann. Anhand eines einfachen mathematischen Modells werden die wesentlichen Einflussfaktoren des BLMV auf das Fahrverhalten identifiziert und ein optimiertes Systemlayout abgeleitet. Dessen theoretisches Potential wird – unter Berücksichtigung verschiedener Fahrstile und kurvenadaptiver Bremskraftverteilungen – mit dem des Standardfahrwerks verglichen. Erstmalig wird ein Versuchsmotorrad mit einem modernen Bremssystem (Honda CBR 600 RR, C-ABS) mit einem BLMV ausgerüstet und in Kurvenbremsversuchen erprobt. Im Vergleich zum Serienfahrwerk werden bremslenkmomentbedingte Störungen signifikant reduziert und die Richtungskontrolle erleichtert. Die gewonnenen Erkenntnisse schaffen die Grundlage für zukünftige Fahrerassistenzsysteme mit autonomer Kurvenbremsung und damit zur weiteren Verbesserung der Motorradsicherheit.German
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