Induction and Turbocharging Flashcards
The primary purpose of an induction system in a reciprocating engine is to provide a sufficient quantity of air to support normal ______.
COMBUSTION
(AIR FILTERING) If dust could accumulate and clog an oil passage. What could happen?
- It will cause oil starvation
- dust could fuck up FUEL METERING DEVICE and disrupts it’s ability to provide fuel/air mixture. Therefore , ENGINE POWER is affected
The purpose of a fuel delivery system is to meter the amount of fuel based on the ______ of ____ delivered to the cylinders.
volume of air
Drawback for Superchargers?
they use a large amount of the engine’s power output for the amount of power increase that they produce.
_______ are powered by engine exhaust. In other words, a turbocharger recovers energy from a source that would otherwise be lost.
turbochargers
_______ is defined as the maximum altitude that a turbocharged engine can produce its rated horsepower
under standard atmospheric conditions.
Critical altitude
What happens if a turbocharged engine exceeds critical altitude?
power output begins to decrease like a normally aspirated engine.
Where is turbocharger located?
between the air intake and the fuel metering device
or between the compressor discharge and throttle valve
A continuous flow of ______ ______ must be pumped through the bearing housing to cool and lubricate the bearings.
engine oil
An _____ is a small heat exchanger that uses outside air to cool the hot compressed air before it enters the fuel metering device.
intercooler
When a wastegate is fully _____, all of the exhaust gases bypass the turbocharger and pass out the exhaust stack.
open
When a wastegate is fully ______, all of the exhaust gases are routed through the turbine before they exit through the exhaust.
closed
Protection for overboost condition?
Pressure Relief valve
For waste gate actuators , the wastegate is held open by _____ pressure and closed by _____ pressure that acts on a piston.
spring, oil
_____ _____ ____ consist of a bellows and a variable restrictor valve. The bellows senses the absolute pressure of the air before it enters the fuel metering device. This pressure is commonly referred to as ____ _____ _____.
Absolute Pressure Controller(APC)
Upper deck pressure
On Automatic control system waste-gate actuator is controlled by ______?
APC
______ is similar to APC but instead of using a bellows to control the position of a restrictor valve, the position of the restrictor valve seat is controlled by a CAM that is actuated by the throttle control.
Variable absolute pressure controller (VAPC)
The _______ monitors both the ambient and upper deck pressures to PREVENT the turbocharger
from boosting upper deck pressure more than 2.2 times the ambient pressure.
pressure-ratio controller
____ - ____ - ____ controller prevents upper deck pressure from increasing too RAPIDLY.
rate-of-change controller
The ______ ______ valve assembly functions in a manner similar to the wastegate actuator.
exhaust bypass
If the density of the air is insufficient to produce full engine power, the _______ _______ adjusts the oil pressure acting on the exhaust bypass valve assembly so more exhaust is directed to the turbocharger.
density controller
_________ typically occurs during part-throttle operation and is characterized by a continual drift or transient increase in manifold pressure.
Bootstrapping
As turbocharger air passes through a ______ ______, it accelerates to transonic speed to produce a shock wave. The shock wave slows the remaining airflow in the venturi, thereby limiting the amount of air entering the cabin.
sonic venturi
A _______ engine is a reciprocating engine in which exhaust driven turbines are coupled to the engine crankshaft.
turbocompound
a _______ system enables an engine to recover energy from the velocity of the exhaust gases that would be lost if
they were ducted overboard.
Power Recovery Turbine (PRT)
