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[[Category:English]]
[[Category:Engine Fundamentals]]

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= Introduction =

This aiMOOC introduces '''Engine Fundamentals''' for apprentices, trainees, and vocational students who need a practical understanding of modern reciprocating internal-combustion engines. You will learn how an engine changes the chemical energy of fuel into useful mechanical work, how the main components cooperate, how gasoline and diesel engines differ, how lubrication and cooling protect the engine, and how a technician approaches basic inspection and fault diagnosis.

The main focus is the four-stroke piston engine used in many cars, vans, trucks, machines, generators, and training rigs. The principles also help you understand related systems in hybrid vehicles. High-voltage hybrid and electric-vehicle work requires separate specialist training and authorization.

[[File:Cummins Turbo Diesel cutaway.jpg|500px|frameless|center]]

A cutaway engine lets you connect workshop vocabulary with real parts. Look for the cylinders, pistons, connecting rods, crankshaft, cylinder head, intake and exhaust passages, and turbocharger.

{{#ev:youtube|https://www.youtube.com/watch?v=ZQvfHyfgBtA|500|center}}

'''Learning goals:''' By the end of the course, you should be able to explain the four-stroke cycle, identify major engine components, compare spark-ignition and compression-ignition engines, trace basic oil and coolant flow, interpret common symptoms, and plan safe first-line diagnostic checks.

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= What an Engine Does =

An [[English:Internal combustion engine|internal-combustion engine]] is a heat engine. Fuel burns with air inside the engine. Combustion creates hot, high-pressure gases. In a piston engine, those gases push a piston. The piston transfers force through a connecting rod to the crankshaft, and the crankshaft turns. In a vehicle, the transmission and final drive transfer this rotation to the wheels.

Energy conversion is never perfect. Some fuel energy becomes useful mechanical work, while much leaves as heat through the cooling system and exhaust or is lost through friction and pumping. Good engine design and maintenance therefore aim to manage combustion, friction, heat, airflow, and emissions.

[[File:Kawasaki Ninja H2R engine cutaway cylinder.JPG|500px|frameless|center]]

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== Core Mechanical Components ==

'''Cylinder block:''' The block forms the main engine structure and contains the cylinders. It also includes passages for coolant and oil on many designs.

'''Cylinder head:''' The head closes the top of the cylinders and contains the combustion chambers, ports, valves, and often the camshafts, spark plugs, or injectors.

'''Piston and piston rings:''' The piston moves up and down in the cylinder. Rings help seal combustion pressure, control lubricating oil on the cylinder wall, and transfer heat from the piston to the cylinder.

'''Connecting rod:''' The rod links the piston to the crankshaft.

'''Crankshaft:''' The crankshaft changes the piston's reciprocating motion into rotary motion. Main bearings support it in the engine block.

'''Camshaft and valves:''' Cam lobes operate the intake and exhaust valves. The valve train must be timed to the crankshaft so the valves open and close at the correct points in the cycle.

'''Flywheel or flexplate:''' This component is attached to the crankshaft. It helps smooth speed changes between power strokes and connects the engine to the clutch or torque converter.

[[File:Piston bielle vilebrequin coupe et schema cinematique.svg|500px|frameless|center]]

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== Bore, Stroke, Displacement, and Compression Ratio ==

'''Bore''' is the cylinder diameter. '''Stroke''' is the distance the piston travels between [[English:Top dead centre|top dead center]] and [[English:Bottom dead centre|bottom dead center]]. Engine displacement is the total swept volume of all cylinders. For a conventional cylindrical bore, displacement equals the area of one cylinder multiplied by stroke and then by the number of cylinders.

'''Compression ratio''' compares the cylinder volume when the piston is at bottom dead center with the much smaller volume when it is at top dead center. It is a geometric ratio, not the same as a compression-pressure test result.

'''Torque''' is a turning effect at the crankshaft. '''Power''' describes the rate of doing work and depends on torque together with rotational speed. In service work, you should distinguish these terms rather than using them as synonyms.

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= The Four-Stroke Cycle =

A four-stroke engine completes one operating cycle in four piston strokes and two crankshaft revolutions. The usual sequence is intake, compression, power, and exhaust. In a conventional four-stroke valve train, the camshaft completes one revolution while the crankshaft completes two.

[[File:4-Stroke-Engine.gif|500px|frameless|center]]

[[File:Four stroke engine diagram.jpg|500px|frameless|center]]

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== Intake Stroke ==

The piston moves down from top dead center toward bottom dead center while the intake valve is open. Fresh charge enters the cylinder. In many gasoline engines this charge is air mixed with fuel, although direct-injection engines may add fuel directly in the cylinder. In a diesel engine, the intake charge is primarily air.

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== Compression Stroke ==

The piston moves upward while the intake and exhaust valves are closed. The trapped charge is compressed, so its pressure and temperature rise. Near the end of compression, the engine must initiate combustion at the correct time.

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== Power Stroke ==

Combustion raises cylinder pressure sharply. Expanding gases push the piston downward and deliver useful torque to the crankshaft. This is the stroke that directly produces positive work in the basic four-stroke cycle.

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== Exhaust Stroke ==

The exhaust valve opens and the piston moves upward, pushing burned gases out of the cylinder. Real engines use carefully designed valve timing, and intake and exhaust valve events may overlap around the transition between exhaust and intake.

[[File:Casovanie4T.png|500px|frameless|center]]

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= Gasoline and Diesel Combustion =

Both gasoline and diesel engines can use the four-stroke cycle, but they prepare and ignite the charge differently.

'''Spark-ignition gasoline engine:''' Air and fuel are prepared in a combustible mixture. Near the end of compression, the ignition system supplies high voltage to a [[English:Spark plug|spark plug]]. The spark starts combustion. Modern engines use electronic control to adjust ignition timing according to operating conditions.

[[File:Spark plug.svg|350px|frameless|center]]

'''Compression-ignition diesel engine:''' The cylinder compresses air to a high pressure and temperature. Fuel is injected into the hot compressed air at a controlled time and rate, and it autoignites without a spark plug. Many diesel engines use glow plugs or other aids for cold starting, but glow plugs are not the normal ignition source once the engine is operating.

{{#ev:youtube|https://www.youtube.com/watch?v=fTAUq6G9apg|500|center}}

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= Air, Fuel, Ignition, and Engine Management =

An engine needs the correct amount of clean air and fuel, delivered at the correct time. The intake system commonly includes an air filter, ducting, sensors, a manifold, and, on many gasoline engines, a throttle. The engine control unit uses sensor signals and programmed strategies to control fuel delivery, ignition, idle functions, boost, emissions equipment, and other actuators depending on the engine design.

Modern fuel injectors meter and atomize fuel. Port fuel injection sprays into an intake port, while gasoline direct injection sprays into the combustion chamber. Common-rail diesel systems store fuel at very high pressure and use electronically controlled injectors. Because fuel pressure can be dangerous, depressurization and testing must follow the manufacturer's service information.

[[File:Fuelinjector.png|500px|frameless|center]]

An engine must also keep camshaft and crankshaft timing synchronized. Timing belts, chains, or gears provide the mechanical drive. Incorrect timing can cause poor running, a no-start condition, or mechanical contact in interference-engine designs.

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= Lubrication System =

Engine oil forms a protective film between moving surfaces, reduces friction and wear, carries heat, helps seal piston rings, suspends contaminants, and can operate hydraulic devices such as lash adjusters or variable valve-timing actuators.

A typical pressure-lubrication path is '''oil sump → pickup → oil pump → filter → oil galleries → bearings and other lubricated components → return to sump'''. The exact route varies by engine. Oil pressure depends on pump operation, engine speed, oil temperature and viscosity, clearances, restrictions, and system condition.

{{#ev:youtube|https://www.youtube.com/watch?v=mmmcj53TNic|500|center}}

Use the oil grade and specification required by the vehicle or engine manufacturer. An oil-pressure warning must be treated seriously: continued operation with genuinely low oil pressure can quickly damage bearings, camshafts, turbochargers, and other parts.

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= Cooling System =

The cooling system regulates engine temperature. A typical liquid-cooled system uses coolant passages in the block and head, a coolant pump, thermostat, radiator, fan, hoses, and an expansion or recovery tank. The thermostat controls coolant routing according to temperature so the engine can warm up and then reject excess heat through the radiator.

[[File:Układ chłodzenia silnika spalinowego.svg|500px|frameless|center]]

{{#ev:youtube|https://www.youtube.com/watch?v=k0ovUHEOtyE|500|center}}

Overheating can result from coolant loss, trapped air, a faulty thermostat, poor pump circulation, fan faults, airflow restriction, combustion-gas leakage, or other causes. Do not remove a pressure cap from a hot cooling system. Hot pressurized coolant can cause severe burns. Allow the system to cool and follow the manufacturer's procedure.

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= Intake Boosting and Exhaust =

A naturally aspirated engine relies on atmospheric pressure and piston movement to fill its cylinders. A [[English:Turbocharger|turbocharger]] uses exhaust-gas energy to drive a turbine connected by a shaft to a compressor. The compressor raises intake-air pressure so more air mass can enter the engine. Many systems use an intercooler to reduce the temperature of compressed intake air.

[[File:Sectioned Garrett AiResearch turbocharger.JPG|500px|frameless|center]]

Turbocharged engines place additional demands on lubrication, cooling, intake sealing, and charge-air hoses. A boost complaint should be diagnosed systematically rather than by replacing the turbocharger first.

The exhaust system carries combustion gases away from the engine and usually includes emissions-control devices. Depending on the engine and market, these may include a three-way catalytic converter, exhaust-gas recirculation, a diesel oxidation catalyst, a diesel particulate filter, and selective catalytic reduction. Internal-combustion engines can emit carbon monoxide, nitrogen oxides, hydrocarbons or other organic gases, particulate matter, and greenhouse gases, so correct engine control and aftertreatment operation matter for both performance and air quality.

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= Engine Timing and Breathing =

Valve timing determines when each intake and exhaust valve opens and closes relative to piston position. Modern systems may vary camshaft phase or valve lift to improve torque, efficiency, emissions, or high-speed breathing. A technician must distinguish '''mechanical timing''' from '''ignition timing''' and '''injection timing'''.

Airflow restrictions, intake leaks, incorrect valve timing, exhaust restrictions, and boost leaks can all reduce cylinder filling. A useful diagnostic habit is to think in paths: '''air in → compression → combustion → torque out → exhaust out'''. Then ask where the process is being lost.

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= Basic Diagnostic Thinking =

Good diagnosis is a process, not a parts-changing contest. Begin by confirming the complaint and checking whether the vehicle is safe to test. Record when the symptom occurs: cold or hot, idle or load, steady speed or acceleration, dry or wet conditions, after repairs, or only intermittently.

A basic sequence is to inspect fluid levels and condition, look for loose connectors and damaged hoses, check for obvious leaks or mechanical damage, scan for diagnostic trouble codes where applicable, examine live data, and then choose targeted electrical or mechanical tests.

'''Compression testing''' compares the ability of cylinders to build pressure during cranking. '''Cylinder leak-down testing''' introduces regulated compressed air to a cylinder at a specified piston position and helps identify leakage past valves, piston rings, or the head gasket. '''Fuel-pressure, oil-pressure, vacuum, boost, and cooling-system pressure tests''' are useful when the symptom and service information justify them.

Do not treat a diagnostic trouble code as proof that the named component has failed. A code identifies a monitored condition or circuit problem and must be interpreted with wiring diagrams, specifications, measurements, and the symptom.

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== Symptom Examples ==

'''No start:''' Check cranking speed, battery condition, immobilizer status, fuel delivery, spark or injection command as applicable, compression, and timing according to the engine design.

'''Misfire or rough running:''' Compare cylinders and consider ignition, injector operation, air leaks, mechanical sealing, compression, timing, and control inputs.

'''Overheating:''' Confirm the temperature reading, coolant level when safe, circulation, thermostat operation, fan control, radiator airflow, leaks, and possible combustion-gas entry.

'''Low oil pressure warning:''' Stop unnecessary operation. Verify oil level, correct oil, the warning-sensor circuit, and actual pressure with the specified test method before deciding on internal repair.

'''Abnormal exhaust smoke:''' Color can provide clues, but diagnosis must consider operating conditions. Persistent blue smoke can indicate oil entering combustion, dense black smoke can indicate excessive fuel or insufficient air in many diesel situations, and persistent white vapor after warm-up can have several causes including coolant entry on some faults.

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= Workshop Safety =

Engine work combines heat, rotating machinery, stored pressure, electricity, chemicals, heavy components, and exhaust gases. Use eye protection and other personal protective equipment required by the task. Keep hands, clothing, tools, and test leads away from belts, pulleys, fans, and other moving parts. Remember that electric cooling fans may start automatically on some vehicles.

Never work under a vehicle supported only by a jack. Use approved lifting points and properly rated stands or lifting equipment. Support engines and heavy components with equipment designed for the load.

Treat hot cooling systems and pressurized fuel systems as stored-energy hazards. Disconnect or isolate electrical power when the procedure requires it, while preserving vehicle data and following manufacturer instructions. Batteries can deliver very high current and can produce flammable gas during charging.

Do not run a combustion engine in an enclosed or poorly ventilated area. Exhaust can contain carbon monoxide, a colorless and odorless toxic gas. Use suitable exhaust extraction and workshop ventilation.

For hybrid or electric vehicles, orange high-voltage cables and components require specific training, personal protective equipment, isolation procedures, and legal or employer authorization. This introductory course does not qualify you for live high-voltage work.

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= Service Information and Professional Practice =

Specifications are engine-specific. Tightening torque, torque-angle procedures, timing marks, fluid type, oil viscosity, coolant formulation, test pressures, sensor values, and disassembly sequences must come from current manufacturer or approved technical information for the exact engine.

Professional practice includes cleanliness, correct tool selection, calibrated measuring equipment where required, labeling and organizing removed parts, replacing single-use fasteners or seals when specified, documenting measurements, and confirming the repair with a final operational check.

A strong technician can explain not only '''what''' failed, but also '''why the test supports that conclusion''' and '''how the repair will be verified'''.

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= Interactive Tasks =

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== Quiz: Test Your Knowledge ==

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'''Which stroke draws fresh charge into a four-stroke cylinder?'''
(Intake stroke)
(!Compression stroke)
(!Power stroke)
(!Exhaust stroke)

{{E}}
<br>

{{MC}}

'''How many crankshaft revolutions complete one four-stroke cycle?'''
(Two revolutions)
(!One revolution)
(!Three revolutions)
(!Four revolutions)

{{E}}
<br>

{{MC}}

'''Which component converts piston movement into rotary motion?'''
(Crankshaft)
(!Thermostat)
(!Radiator)
(!Injector)

{{E}}
<br>

{{MC}}

'''What normally initiates combustion in a gasoline spark-ignition engine?'''
(Spark plug)
(!Glow plug)
(!Oil pump)
(!Thermostat)

{{E}}
<br>

{{MC}}

'''What normally initiates combustion in a diesel compression-ignition engine?'''
(Heat of compression)
(!Spark plug)
(!Cooling fan)
(!Starter relay)

{{E}}
<br>

{{MC}}

'''What is a primary purpose of engine oil?'''
(Lubricate moving surfaces)
(!Increase coolant pressure)
(!Open exhaust valves)
(!Create battery voltage)

{{E}}
<br>

{{MC}}

'''What does the thermostat mainly regulate in a liquid-cooled engine?'''
(Coolant flow)
(!Fuel octane)
(!Battery current)
(!Tire pressure)

{{E}}
<br>

{{MC}}

'''What is the safe action before opening a hot pressurized cooling system?'''
(Allow the system to cool)
(!Remove the cap immediately)
(!Increase engine speed)
(!Disconnect the injector)

{{E}}
<br>

{{MC}}

'''What drives the turbine side of a typical turbocharger?'''
(Exhaust gas)
(!Battery current)
(!Coolant pressure)
(!Starter motor)

{{E}}
<br>

{{MC}}

'''What should a technician do early in a systematic diagnosis?'''
(Verify the symptom)
(!Replace the engine)
(!Clear all evidence)
(!Ignore service information)

{{E}}
<br>

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== Memory Game ==

<div class="memo-quiz">
{|
|-
| Crankshaft || Converts reciprocating piston motion into rotation
|-
| Camshaft || Controls valve opening through cam lobes
|-
| Thermostat || Regulates coolant routing according to temperature
|-
| Injector || Meters and atomizes fuel
|-
| Turbocharger || Uses exhaust energy to compress intake air
|-
| Piston ring || Helps seal combustion pressure at the cylinder wall
|}
{{E}}
<br>

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== Drag and Drop ==

<div class="lueckentext-quiz">

{| class="wikitable"
! Match the correct terms.
! Topic
|-
| '''Persistent blue exhaust smoke'''
| Possible oil consumption
|-
| '''Repeated coolant loss'''
| Cooling system leak investigation
|-
| '''Low measured compression'''
| Mechanical sealing check
|-
| '''Whistling under boost'''
| Charge air leak inspection
|-
| '''Oil pressure warning'''
| Lubrication pressure verification
|}
{{E}}

<br>
<br />

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== Crossword Puzzle ==

<div class="kreuzwort-quiz">
{|
|-
| Piston || Which moving component travels up and down inside a cylinder?
|-
| Crankshaft || Which shaft changes piston movement into rotation?
|-
| Camshaft || Which shaft uses lobes to operate valves?
|-
| Injector || Which component meters fuel into an intake port or combustion chamber?
|-
| Thermostat || Which cooling component regulates coolant routing according to temperature?
|-
| Turbocharger || Which device uses an exhaust-driven turbine to compress intake air?
|}
{{E}}
<br>

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== LearningApps ==

<iframe> https://learningapps.org/index.php?s=Engine+Fundamentals </iframe>

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== Cloze Text ==

<quiz display=simple>
{'''Complete the text.'''<br>
|type="{}"}
A piston engine converts fuel energy into useful { mechanical work }. The crankshaft changes reciprocating piston motion into { rotation }. A four-stroke cycle requires { two crankshaft revolutions }. During the intake stroke the piston moves down while the { intake valve } is open. During compression the trapped charge is squeezed before { combustion }. A gasoline spark-ignition engine normally uses a { spark plug } to start combustion. A diesel engine normally ignites fuel using the heat created by { compression }. Engine oil reduces friction and protects { moving surfaces }. The thermostat helps regulate the engine by controlling { coolant flow }. A turbocharger uses exhaust energy to drive a { compressor }. Systematic diagnosis begins by verifying the { symptom }. A hot pressurized cooling system must be allowed to { cool } before it is opened safely.
</quiz>

<br>

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= Open-Ended Tasks =

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=== Easy ===
# [[English:Engine component identification|Engine component identification]]: Photograph or sketch a training engine and label at least ten visible components, then write one clear sentence explaining the function of each.
# [[English:Four-stroke cycle storyboard|Four-stroke cycle storyboard]]: Create a four-panel image showing intake, compression, power, and exhaust, including piston direction and valve state in every panel.
# [[English:Workshop safety checklist|Workshop safety checklist]]: Inspect a training bay with your instructor and produce a one-page checklist covering rotating parts, hot surfaces, exhaust extraction, lifting, fluids, and electrical hazards.
# [[English:Engine vocabulary map|Engine vocabulary map]]: Build a concept map linking cylinder, piston, connecting rod, crankshaft, camshaft, valve, injector, spark plug, oil pump, and thermostat.

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=== Standard ===
# [[English:Cooling system inspection|Cooling system inspection]]: On a cold training engine, identify the radiator, hoses, expansion tank, thermostat location, coolant pump drive, and fan, then explain the expected coolant path without opening a hot system.
# [[English:Lubrication flow model|Lubrication flow model]]: Create a diagram or physical model that traces oil from the sump through the pump, filter, galleries, bearings, and return path, and explain two consequences of low oil pressure.
# [[English:Gasoline and diesel comparison|Gasoline and diesel comparison]]: Interview a qualified technician and write a comparison of spark ignition and compression ignition covering charge preparation, ignition, injection, cold starting, and typical service concerns.
# [[English:Diagnostic case report|Diagnostic case report]]: Choose one symptom such as misfire, overheating, or no start, list at least four possible causes, and design a test sequence that separates them without replacing parts at random.

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=== Advanced ===
# [[English:Compression test plan|Compression test plan]]: With instructor supervision and service information, design and carry out a compression or leak-down experiment on a suitable training engine, record results, and explain what the measurements do and do not prove.
# [[English:Fault diagnosis project|Fault diagnosis project]]: Introduce or use an instructor-approved fault on a training rig, gather scan data and physical measurements, form a hypothesis, test it, repair the fault if authorized, and document verification.
# [[English:Engine efficiency investigation|Engine efficiency investigation]]: Research where fuel energy goes in an internal-combustion engine and produce a technical poster that connects useful work, exhaust heat, cooling losses, friction, pumping, and emissions.
# [[English:Workshop teaching video|Workshop teaching video]]: Produce a short training video for other apprentices that demonstrates one safe engine inspection procedure, cites the required service information, explains each decision, and includes a final verification step.

{{:Open Task - Create a MOOC}}

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= Learning Assessment =

# [[English:Four-stroke reasoning|Four-stroke reasoning]]: Explain how a mistimed intake or exhaust valve can reduce cylinder filling, compression, power, and exhaust quality across more than one stroke.
# [[English:Gasoline diesel transfer|Gasoline diesel transfer]]: Given a no-start gasoline engine and a no-start diesel engine, compare which ignition and fuel checks should differ and justify the order of your tests.
# [[English:Cooling fault analysis|Cooling fault analysis]]: A vehicle overheats only at low road speed but cools at higher speed; propose several plausible causes and design observations or measurements that would separate them.
# [[English:Lubrication decision making|Lubrication decision making]]: An oil-pressure warning appears on a hot engine at idle; explain which immediate safety decision you would make and which tests would distinguish a sensor fault from genuinely low pressure.
# [[English:Evidence based diagnosis|Evidence based diagnosis]]: A scan tool reports a misfire code for one cylinder; design a test plan that can distinguish ignition, fuel, air, compression, and mechanical timing faults without assuming the named cylinder component is defective.
# [[English:Professional repair verification|Professional repair verification]]: After a cooling-system repair, create a verification plan that checks leak tightness, coolant level, operating temperature, fan control, cabin heater performance where relevant, and the original customer complaint.

<br>
<br>

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= Evidence of Learning =

# '''Knowledge:''' You can accurately explain energy conversion, four-stroke operation, major mechanical components, spark and compression ignition, lubrication, cooling, boosting, and basic emissions control.
# '''Skills:''' You can identify components, trace system flows, use service information, select safe first-line checks, record measurements, and connect symptoms with testable hypotheses.
# '''Products:''' Your evidence can include labeled diagrams, inspection checklists, diagnostic reports, measurement tables, interview notes, posters, photographs, and instructional videos.
# '''Transfer:''' You can apply the same system-based reasoning to unfamiliar engine layouts by tracing air, fuel, compression, combustion, lubrication, cooling, electrical control, and exhaust paths.
# '''Professional behavior:''' You can justify safety precautions, avoid unnecessary parts replacement, communicate limitations of a test, document evidence, and verify the result of a repair.

<br>
<br>

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= OERs on the Topic =

<iframe> https://en.m.wikipedia.org/wiki/Internal_combustion_engine </iframe>

[https://www.energy.gov/cmei/vehicles/articles/internal-combustion-engine-basics U.S. Department of Energy: Internal Combustion Engine Basics]

[https://www.cdc.gov/niosh/carbon-monoxide/about/index.html CDC and NIOSH: Carbon Monoxide Hazards at Work]

[https://www.epa.gov/greenvehicles/smog-vehicle-emissions U.S. Environmental Protection Agency: Smog Vehicle Emissions]

<br>

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= Linked Learning Areas =

{| align=center
{{:D-Tab}}
'''[[English:Engine Fundamentals|Engine Fundamentals]]'''
# [[English:Internal combustion engine|Internal combustion engine]]
# [[English:Four-stroke engine|Four-stroke engine]]
# [[English:Piston|Piston]]
# [[English:Crankshaft|Crankshaft]]
# [[English:Camshaft|Camshaft]]
# [[English:Valve train|Valve train]]
# [[English:Fuel injection|Fuel injection]]
# [[English:Spark ignition|Spark ignition]]
# [[English:Diesel engine|Diesel engine]]
# [[English:Engine cooling|Engine cooling]]
# [[English:Engine lubrication system|Engine lubrication system]]
# [[English:Turbocharger|Turbocharger]]
# [[English:On-board diagnostics|On-board diagnostics]]
# [[English:Automotive safety|Automotive safety]]
|}

{{BR}}
= aiMOOC Projects =
[[Category:English]]
[[Category:Engine Fundamentals]]
[[Category:Vocational Education]]
[[Category:Automotive Engineering]]
[[Category:Mechanical Engineering]]
[[Category:Automotive technology]]
[[Category:Internal combustion engines]]
[[Category:AI_MOOC]]
[[Category:GPT aiMOOC]]
{{MT}}

English:Engine Fundamentals - Versionsgeschichte

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