Automotive technical abbreviations
ABS Anti-blockier system (German) - anti-lock braking system
ABDC After bottom dead centre (engine timing)
A/C Air conditioning
ACL Automatic chassis lubrication (commercial vehicles)
ACT Air charge temperature
A/F Air/fuel ratio
AIR Air injection reactor (emission control)
ALB Anti-lock brakes (Honda)
ARCS Active roll control system (Citroen)
ASD Automatic slip-control differential
ASF Audi space frame (aluminium body construction)
ASR Antriebs-schulpf-regelung (German) -anti-slip regulation or traction control syster
ATC Automatic temperature control
ATDC After top dead centre (engine timing)
ATF Automatic transmission fluid
AWD All-wheel drive (also 4WD)
AWS All-wheel steering (also 4WS)
BBDC Before bottom dead centre (engine timing)
BDC Bottom dead centre (engine timing)
BHP Brake horsepower
BMEP Brake mean effective pressure
BOFT Bearing oil film thickness
BSFC Brake specific fuel consumption
BTDC Before top dead centre (engine timing)
CAD Computer aided design
CAFE Corporate average fuel economy (American)
CAG Computer aided gearshift (Scania)
CB Contact breaker
CBE Cab behind engine (commercial vehicles)
Cd Coefficient of drag (vehicle aerodynamics)
CD Capacity discharge (ignition system)
CFC Chlorofluorocarbon (refrigerant)
CI Compression ignition (diesel engines)
CO Carbon monoxide (emission control)
CO2 Carbon dioxide (global warming)
COE Cab over engine (commercial vehicles)
CP Centre of pressure (vehicle aerodynamics)
CR Compression ratio (engine)
CTX Continuously variable transaxle (Ford)
CV Constant velocity (universal joints)
CVT Continuously variable transmission
Cw Coefficient of drag (German) - vehicle aerodynamics
Cx Coefficient of drag (French) - vehicle aerodynamics
DERV Diesel engine road vehicles (fuel)
DI Direct injection
DIS Direct ignition system (no distributor)
reactor缩写DOHC Double overhead camshafts
EBS Electronic braking system (air brakes)
ECI Electronically controlled injection
ECM Electronic control module
ECS Evaporative control system (fuel system) Electronically controlled suspension
ECT Engine coolant temperature
ECU Electronic control unit
EDC Electronic diesel control
EFI Electronic fuel injection
EGR Exhaust gas recirculation (emission control)
EMS Engine management system
EP Extreme pressure (lubricants)
EPAS Electrical power-assisted steering (NSK-RHP)
EPHS Electrically powered hydraulic steering (TRW Steering Systems)
EPS Electric power steering (EPAS)
EUI Electronic unit injector (Lucas Diesel)
EVC Exhaust valve closed (engine timing)
EVO Exhaust valve open (engine timing)
FHP Friction horsepower
FWD Front-wheel drive
GCW Gross combination weight (articulated vehicles)
GRP Glass reinforced plastics
GTW Gross train weight (drawbar vehicles)
GV Governor valve (automatic transmissions)
GVW Gross vehicle weight (rigid vehicles)
GWP Greenhouse warming potential (refrigerants)
HC Hydrocarbons (emission control)
HFC Hydrofluorocarbon (refrigerant)
HGV Heavy goods vehicle
HUCR Highest useful compression ratio
HVAC Heating, ventilation and air conditioning
IFS Independent front suspension
IHP Indicated horsepower
INJ Injection (timing mark)
IOE Inlet over exhaust (obsolete valve layout)
IRS Independent rear suspension
IVC Inlet valve closed (valve timing)
IVO Inlet valve open (valve timing)
KPI King-pin inclination (steering)
LGV Large goods vehicle
LI Load index (tyres)
LS Leading shoe (drum brakes)
MAF Mass air flow (engines)
MAP Manifold absolute pressure
MOFT Minimum oil film thickness
MON Motor octane number (more demanding ON test)
MPI Multi-point injection
MPV Multi-purpose vehicle (people carrier)
NOx Nitrogen oxides (emission control)
NVH Noise, vibration and harshness (vehicle refinement testing)
OBD On-board diagnosis
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