DYNAMIC SIMULATION OF AN INNOVATIVE PERMANENTLY ENGAGED MECHANISM FOR STARTING SYSTEMS
Alvaro Canto Michelotti1; Jonny Carlos da Silva2
1 ZEN S.A. Indústria Metalúrgica; 2 Universidade Federal de Santa Catarina
doi:10.20906/CPS/COB-2015-1827
Resumo
Environmental challenges to reduce current emission levels place a strong pressure in the automotive industry. Alternatives to replace internal combustion engines have both technology and infrastructure constraints to allow wider spread of electric and fuel cell vehicles. Another option is to increase internal combustion engine vehicles efficiency. Following this direction, Stop-Start Vehicles (SSV), aiming to reduce fuel consumption and emissions, are a promising market trend. SSV impose a new challenge to current starting systems for internal combustion engine. Alternatives to improve starting systems may involve innovative One-Way Clutch design. One promising concept is the mechanical diode or ratchet-pawl configuration, a reliable option for high torque transmission and low friction wear during overrunning but has limited application in current starting systems. One potential constraint when dimensioning a pawl-ratchet is the impact noise generated by the strut during engagement. This paper presents a 1-D dynamic model, whose damping effect was evaluated in a prototype installed in a flywheel to start an engine in a test bench. The proposed design allows a more robust mechanical interface for starting systems and provides an option for the evolution of the starting system and the spread of SSV as a viable fuel efficiency alternative.
Palavras-chave: Starting Systems; Stop-Start Vehicles; One-Way Clutch; 1-D Modeling and Simulation; Damping System