top dead center

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top dead center

[¦täp ′ded ′sen·tər]
(mechanical engineering)
The dead-center position of an engine piston and its crankshaft arm when at the top or outer end of its stroke.

top dead center (TDC)

top dead center (TDC)click for a larger image
top dead center (TDC)click for a larger image
Topographical map
The position of the piston within the cylinder when the piston has reached its farthest uppermost (closest to the cylinder head and valves) position.
References in periodicals archive ?
Acronyms ATDC: After top dead centre BTDC: Before top dead centre CA: Crank angle CFD: Computational fluid dynamics CO: Carbon monoxide EOI: End of injection HC: Hydrocarbon HPCR: High pressure common rail HRR: Heat release rate HSDI: High speed direct injection NOx: Nitrogen oxides PM: Particulate matters TDC: Top dead centre.
All the tests are performed at an injection timing 23[degrees] before top dead centre (bTDC).
"Our research has shown that combustion temperatures and, thus the generation of N[O.sub.x], can be reduced by injecting the fuel closer to piston top dead centre. However, since this requires a very fast rate of fuel injection it called for increased fuel injection pressures.
Several previous studies have shown that an engine operation close to the optimum can be achieved on a wide range of fuels by keeping the combustion phasing constant at a few degrees crank angle ([degrees]CA) after top dead centre (aTDC).
In each case the final compression occurs during the final 10mm of piston stroke, or around 35[degrees] before top dead centre.
When the piston reaches the top dead centre of the cylinder, liquid nitrogen at -196[degrees]C from an insulated tank is injected into the cylinder.