Engine boosting — definition of supercharging What is the engineering term for the process in which intake air is supplied to an engine cylinder at a pressure higher than the surrounding atmospheric pressure?

Introduction / Context:
Modern engines frequently use devices to increase air mass flow so that more fuel can be burned efficiently, improving power density. The general umbrella term for raising the intake pressure above atmospheric is important terminology.

Given Data / Assumptions:

• Intake pressure at the manifold exceeds ambient pressure.
• Pressure rise may be produced by a turbocharger or mechanically driven supercharger.
• Four-stroke spark-ignition or compression-ignition engine.

Concept / Approach:
Supercharging denotes any method that increases intake manifold absolute pressure above ambient. Turbocharging is a form of supercharging using exhaust-gas energy; mechanically driven compressors are another form. The result is increased air density, enabling more fuel while maintaining proper air–fuel ratio.

Step-by-Step Solution:

Verification / Alternative check:
Boost gauges show manifold pressure above 1 bar absolute (sea level) during boost events, confirming supercharging.

Why Other Options Are Wrong:

• Auto-ignition and detonation: combustion phenomena, not air-supply methods.
• Scavenging: process of clearing exhaust and filling with fresh charge, typically in two-stroke or boosted engines.
• Aftertreatment: refers to catalytic converters and filters, not intake pressurization.

Common Pitfalls:
Confusing turbocharging as separate from supercharging; both raise intake pressure and fall under supercharging.

Final Answer: