# [TECH] Internal Combustion Engine
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**The Internal Combustion Engine (ICE)** converts chemical energy in fuel into mechanical work via controlled combustion inside a cylinder, enabling the automobile, aviation, and industrial mechanisation.
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## Overview
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Étienne Lenoir (1860) built the first practical gas engine; Nikolaus Otto (1876) invented the four-stroke cycle; Karl Benz and Gottlieb Daimler (1885–1886) built the first petrol-powered automobiles. Rudolph Diesel (1893) invented the compression-ignition engine, more efficient for heavy transport.
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By 1900 the ICE had displaced the steam engine for transport. The automotive industry it spawned became the largest manufacturing sector of the 20th century, driving demand for oil, steel, rubber, glass, and roads.
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## Key Actors
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- **Companies**: Benz & Cie (1883), Daimler (1886), Ford Motor Co. (1903), General Motors (1908), Toyota (1937)
- **Inventors**: Nikolaus Otto (1832–1891), Rudolph Diesel (1858–1913), Karl Benz (1844–1929)
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## Key Patents
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- Otto, N. DE Patent 532 (1877) — four-stroke cycle
- Diesel, R. DE Patent 67,207 (1893) — compression ignition
- Benz, K. DE Patent 37,435 (1886) — motorwagen
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## Economic Value
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Global automotive industry: **$3.0 trillion/year** revenue (2023, OICA). Petroleum industry enabled largely by ICE demand: $5T+/year. Combined transport sector (road, air): ~10% of global GDP (~$10T).
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## Notes
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OICA Production Statistics 2023. IEA Oil 2023 market report for petroleum. The ICE is also a significant source of CO₂ emissions, creating the motivation for electric vehicle transition.
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# Parents
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* [TECH] Steam Engine & Heat Engines⏎