5a Aula TE0315 Sistemas Acessórios MCI Ciclo Otto 04 08 2020

About this Video

• Video Title: 5a Aula TE0315 Sistemas Acessórios MCI Ciclo Otto 04 08 2020
• Channel: William Barcellos
• Speakers: William Barcellos
• Duration: 01:38:02

Introduction

This video lecture discusses accessory systems in the Otto cycle engine, focusing on the starting system, cooling system, and lubrication system. The speaker explains the basic principles and functionality of each system, emphasizing practical applications and potential problems. The lecture also touches upon the evolution of engine technology and the shift towards hybrid engines.

Key Takeaways

• Accessory Systems: The video defines accessory systems as components beyond the engine's fundamental functions (fuel and air intake, combustion control). These have become significantly more complex over time, especially with the integration of electronics.
• Starting System: The starting system's evolution from manual cranks to electric starters is detailed. The lecture explains the components (battery, ignition switch, starter motor, pinion gear) and their interaction. The importance of the correct starter motor for the specific engine is stressed.
• Cooling System: The cooling system uses water and ethylene glycol to maintain optimal engine operating temperature. Ethylene glycol's benefits (anti-corrosion, high boiling point, anti-freeze) are explained. The role of the thermostat and cooling fan is also described, emphasizing the importance of regular maintenance.
• Lubrication System: The lubrication system uses oil to lubricate and cool internal engine components. The importance of oil type and viscosity is explained in detail. The lecture covers the system components (oil pan, filter, pump, and distribution channels), maintenance, and the effects of improper lubrication. The shift towards multi-viscosity oils is also discussed.
• Hybrid Engines: The lecture briefly covers the transition to hybrid engines as a step towards the eventual replacement of combustion engines. Hybrid systems use electric motors (essentially large starter motors) for low-speed operation and combustion engines for higher speeds.