Upgrade to remove ads
MCTI - Auto Tech, Chapter 1 Terms
Auto Tech Chapter 1 Terms to study!
Terms in this set (101)
A term derived from the Greek work 'autos', which means self, and the French word mobile, which means moving.
The application of math, science, physics, and other subjects.
The smallest removable item on a car. A part is not usually disassembled.
A term used when referring to an electrical or electronic part.
A set of fitted parts designed to complete a function.
A group of related parts and assemblies that performs a specific function (job or task).
The strong metal structure that provides a mounting plate for the other parts of the vehicle. This holds the engine, transmission, suspension, and other assemblies in place.
A steel, aluminum, fiberglass, plastic, or composite skin forming the outside of the vehicle. This is painted to give the vehicle an attractive appearance.
Often used when referring to a vehicle's frame and everything mounted to it except the body - tires, wheels, engine, transmission, drive axle assembly, and frame.
In this, the frame consists of thick steel members. The chassis parts and the body bolt to this frame. Also called full frame construction or perimeter frame construction, this design is heavy but strong. It is used on full-size cars, vans, pickup trucks, and sport-utility vehicles.
This consists of sheet body panels which are welded together to form the body and frame. Also called a 'space frame construction or unitized construction', this is the most common type of configuration used to build small and medium passenger cars. This construction reduces weight, improved fuel economy, and has a high strength-to-weight ratio. However, vehicles are not as strong as those with body-over-frame construction.
This provides the energy to propel (move) the vehicle and operate the other systems. Most consume gasoline or diesel fuel.
This is typically used within automobile engines. Four separate piston strokes are needed to produce one cycle. The piston must slide down, up, down, and up again to complete one cycle.
This draws the air-fuel mixture into the engine's combustion chamber. The piston slides down while the intake valve is open and the exhaust valve is closed. this produces a vacuum (low-pressure area) in the cylinder. Atmospheric pressure (outside air pressure) can then force air and fuel into the combustion chamber.
This prepares the air-fuel mixture for combustion. With both valves closed, the piston slides upward and compression (squeezes) the trapped air-fuel mixture.
This produces the energy to operate the engine. With both valves still closed, the spark plug arcs (sparks) and ignites the compressed air-fuel mixture. The burning fuel expands and develops pressure in the combustion chamber and on the top of the piston. This pushes the piston down with enough force to keep the crankshaft spinning until the next power stroke.
This removes the burned gasses from the combustion chamber. During this stroke, the piston slides up while the exhaust valve is open and the intake valve is closed. The burned fuel mixture is pushed out of the engine and into the exhaust system.
These are engines typically used on automobiles. They have more than one piston and cylinder. Vehicles commonly have 4-, 6-, 8-, or 10-cylinder engines. Additional cylinders smooth engine operation and increase power output.
This uses electronic and electrical devices to monitor and control various systems in the vehicle, including the fuel, ignition, drive train, safety and security systems.
This must provide the correct mixture of air and fuel for efficient combustion (burning). This system must add the right amount of fuel entering the cylinders. This must alter the air-fuel ratio (percentage of air and fuel) with changes in the operating conditions (engine temperature, speed, load, and other variables).
This is the percentage of air and fuel.
gasoline injection systems
These use a control module, sensors, and electrically operated fuel injectors (fuel valves) to meter fuel into the engine. This is the most common type of fuel system on gasoline, or spark ignition, engines.
diesel fuel system
This is primarily a mechanical system that forces diesel fuel (not gasoline) directly into the combustion chambers. This does not use spark plugs to ignite the air-fuel mixture. It uses extremely high pressure produced during the compression stroke to heat the air in the combustion chamber. The air is squeezed until it is hot enough to ignite the fuel.
carburetor fuel system
This system uses engine vacuum (suction) to draw fuel into the engine. The amount of air-flow through the carburetor determines the amount of fuel used. This automatically maintains the correct air-fuel ratio. A mechanical or an electrical fuel pump draws fuel out of the tank and delivers it to the carburetor.
This is needed on gasoline engines to ignite the air-fuel mixture. It produces an extremely high voltage surge, which operates the spark plugs. A very hot electric arc jumps across the tip of each spark plug at the correct time. This causes the air-fuel mixture to born, expand, and produce power.
This has a powerful electric starting motor that rotates the engine crankshaft until the engine 'fires' and runs on its own power.
This is needed to replace electrical energy drawn from the battery during the starting system operation. It forces electrical current back into the battery.
This consists of the components that operate a vehicle's interior and exterior lights.
This maintains a constant engine operating temperature. It removes excess combustion heat to prevent engine damage and also speeds engine warm-up.
This reduces friction and wear between internal engine parts by circulating filtered engine oil to high-friction points in the engine. It also helps cool the engine by carrying heat away from internal engine parts.
This quiets the noise produced during engine operation and routes engine exhaust gases to the rear of the vehicle body.
emissions control systems
These are used to reduce the amount of toxic (poisonous) substances produced by an engine. Some prevent fuel vapors from entering the atmosphere. Others remove unburned and partially burned fuel from the engine exhaust.
This transfers turning force from the engine crankshaft to the drive wheels. Configurations vary, depending on vehicle design.
This allows the vehicle's wheels and tires to move up and down with little effect on body movement. This makes the vehicle's ride smooth and safe.
This allows the driver to control the vehicle direction by turning the wheels right or left. It uses a series of gears, swivel joints, and rods to do this.
This produces friction to slow or stop the vehicle.
These include the air conditioner, sound system, power seats, power windows, and read window defogger.
Common types of these systems include seat belts, air bags, and security systems.
This type of vehicle uses two methods of propulsion - an internal combustion engine and a large electric motor-generator - to help improve vehicle performance (acceleration), increase fuel economy (gas mileage), and reduce air emissions (air pollution).
During braking, the rotational force of the vehicle's drive axles spins the motor-generator's armature, causing the motor-generator to produce electrical energy to recharge the battery.
A car that has front and back seats and will carry four to six people. It has center body pillars, or 'B' pillars, between the front and rear doors. Available with two- or four- doors.
Similar to a sedan, but it has no 'B' pillars. Available with two- or four- doors.
Has a vinyl or cloth top that can be raised and lowered. Has no door pillars, and its strength is designed into the frame or floor pan. Most have two-doors, some have four.
hatchback or liftback
Has a large read door for easy access when hauling items. Available in three- or five- door models.
Has a long, straight roof that extends to the rear of the vehicle. These have large rear interior compartments and come in two- or four-door models. Some have space for up to nine passengers.
Similar to the station wagon, but it has a higher roofline for more headroom and cargo space. Most are designed to carry seven passengers.
Often equipped with four-wheel-drive systems and have a tall body design. They provide the comfort of a passenger car, the interior space of a station wagon, and the durability of a truck.
A metal casting that holds all the other engine parts in place.
A round hole bored (machined) in the block. It guides the piston movement.
A cylindrical component that transfers the energy of combustion (burning of air-fuel mixture) to the connecting rod.
These seal the small gap around the sides of the piston. They keep combustion pressure and oil from leaking between the piston and the cylinder wall (cylinder surface).
This links the piston to the crankshaft.
This changes the reciprocating (up-and-down) motion of the piston and rod into useful rotary (spinning) motion.
This covers and seals the top of the cylinder. It also holds the valves, rocker arms, and often, the camshaft.
This is a small cavity (hollow area) between the top of the piston and the bottom of the cylinder head. The burning or the air-fuel mixture occurs in the combustion chamber.
These open and close to control the flow of the air-fuel mixture into the combustion chamber and the exhaust gasses out of the combustion chamber.
This controls the opening of the valves.
These keep the valves closed when they do not need to be open.
These transfer camshaft action to the valves.
lifters or followers
These ride on the camshaft and transfer motion to the other parts of the valve train.
This helps keep the crankshaft turning smoothly. It also provides a large gear for the starting motor.
Up or down movements.
A complete series of events.
These are input devices that can produce or modify electrical signals with a change in a condition, such as motion, temperature, pressure, etc. These are the 'eyes, ears and nose' of the computer system.
This is a computer (electronic circuit) that uses signals to from input devices (sensors) to control various output devices. The control module is the 'brain' of the computer system.
These are output devices, such as small electric motors, that can move parts when energized by the control module. The actuators serve as 'hands and arms' of the computer system.
The process by which fuel burns.
Burnable. Evaporates easily.
This forces fuel from the fuel tank to the engine.
This controls the airflow, engine speed, and engine power. When the throttle valve is open for more engine power output, the computer holds the injectors open longer, allowing more fuel to spray out. When the throttle valve is closed, the computer opens the injectors for only a short period of time, reducing power output.
This consists of several subsystems (smaller circuits): ignition system, starting system, charging system, and lighting system. Each subsystem is designed to perform a specific function.
This produces the electric spark for igniting the mixture of gasoline and air.
When triggered, this produces a high voltage output to 'fire' the spark plugs.
This rotates the engine crankshaft until the engine 'fires' and runs on its own power.
This provides the electricity for the starting system.
This spins the alternator pulley when the engine is running.
This generator can produce electricity to recharge the battery and operate other electrical needs of the vehicle when the engine is running.
This is usually built into the alternator and controls the voltage and current output of the alternator.
This forces coolant through the inside of the engine, hoses, and radiator.
Water and antifreeze solution. This collects heat from the hot engine parts and carries it back to the radiator.
This allows the coolant heat to transfer into the outside air.
This draws cool air through the radiator.
This controls the coolant flow and engine temperature.
This pulls oil out of the pan and pushes it to various moving parts of the engine.
This allows the driver to engage or disengage the engine and manual transmission or transaxle.
This uses various gear combinations, or ratios, to multiply engine speed and torque to accommodate driving conditions. Low gear rations allow the vehicle to accelerate quickly. High gear ratios permit lower engine speed, providing good gas mileage.
This allows the driver to change ratios to better accommodate driving conditions.
This does not need to be shifted by the driver. It uses an internal hydraulic system and, in most cases, electronic controls to shift gears.
The input shaft of an automatic transmission is connected to the engine crankshaft through this instead of a clutch.
Also known as a propeller shaft. This transfers power from the transmission to the rear axle assembly.
rear axle assembly
This contains a differential and two axles.
This is a set of gears and shafts that transmits power from the drive shaft to the axles.
These are steel shafts that connect the differential and drive wheels.
This consists of transmission and a differential in a single housing. Although few rear-wheel-drive vehicles are equipped with these, they are most commonly used with front-wheel-drive vehicles. Both manual and automatic types are available.
front drive axles
These connect the transaxle differential to the hubs and wheels of the vehicle. These axles are equipped with constant-velocity joints, which allow the front wheels to be turned to the left or right and to move up and down.
This is a device that can propel the vehicle like a motor or produce electrical energy like an alternator.
Large diameter, insulated conductors that carry voltage between the motor, generator, hybrid control module, and battery pack.
hybrid control module
High power electrical electronic circuits that manage the flow of electrical energy through a vehicle's electrical-mechanical drive train.
hybrid battery pack
Large set of battery cells that can store huge amounts of electrical energy and output high current and voltage to help propel the vehicle.
internal combustion engine
Gasoline or diesel engine that propels the vehicle at cruising speed and drives the motor-generator.
THIS SET IS OFTEN IN FOLDERS WITH...
MCTI Auto Tech - CH71 Study Guide
Auto Tech - Engine Performance Chapters 1 & 2 - Pi…
Auto Tech - Engine Performance Chapters 3 & 4 - Co…
Auto Tech - Engine Performance Chapters 5 & 6 - Di…
YOU MIGHT ALSO LIKE...
Modern Automotive Technology Chapter 1- The Automo…
Modern Automotive Technology Chapter 1- The Automo…
Chapter 1 The Automobile
OTHER SETS BY THIS CREATOR
MCTI OPET - NOCTI Study Questions
MCTI - Auto Collision Ch. 29 - Entrepreneurship an…
MCTI - Auto Collision Ch. 28 - Estimating Repair C…
MCTI - Auto Collision Ch. 27 - Restraint System Re…
OTHER QUIZLET SETS
CF MOD 3/Part 2
ECO 402 exam 2
Honors English lesson 12 vocab