Engine Terminology and Abbreviations - EngineKnowHow

Abbreviation

Definition

aBDC

after Bottom Dead Centre

aTDC

after Top Dead Centre

bBDC

before Bottom Dead Centre

BDC

Bottom Dead Centre

BMEP

Brake Mean Effective Pressure

BSFC

Brake Specific Fuel Consumption

bTDC

before Top Dead Centre

CA°

Crank Angle Degrees

CO

Carbon Monoxide

CO2

Carbon Dioxide

DI

Direct Injection

ECU

Engine Control Unit

EGR

Exhaust Gas Recirculation

eEGR

External Exhaust Gas Recirculation

EMS

Engine Management System

EVC

Exhaust Valve Closing

EVO

Exhaust Valve Opening

FMEP

Friction Mean Effective Pressure

GMEP

Gross Indicated Mean Effective Pressure

iEGR

Internal Exhaust Gas Recirculation

ISFC

Indicated Specific Fuel Consumption (NMEP)

IVC

Inlet Valve Closing

IVO

Inlet Valve Opening

MBF50%

50% Mass Burn Fraction

MBT

Maximum Brake Torque

MEP

Mean Effective Pressure

MON

Motor Octane Number

NEDC

New European Driving Cycle

NMEP

Net Indicated Mean Effective Pressure

NMEPsd

Standard Deviation of Indicated Mean Effective Pressure

NOx

Nitrogen Oxides

O2

Oxygen

PFI

Port Fuel Injection

PMEP

Pumping Mean Effective Pressure

RON

Research Octane Number

rpm

Revolutions per minute

SOI

Start of Injection

TDC

Top Dead Centre

THC

Total Hydrocarbon (Unburnt)