EV1 ElectricNews

APM   Accessory Power Module

Contains a power supply which interfaces with the auxiliary battery to energize various accessory systems in the EV1. (Housed in PEB)

AC   Alternating Current

An electric current that periodically reverses its direction of current. This reversal usually takes place 60 times (60 cycles) per second in household current in the U.S.

ABS   Anti-lock Braking System

Eliminates brake lock-up during panic or emergency stops.

ACSP   Authorized Charger Service Provider

Provides the infrastructure and equipment to install and service EV1's inductive chargers. In California, Clean Fuel Connection, Inc. (CFCI) is the ACSP. In Arizona, it is EV Power.

Battery Pack

An interconnected group of cells or batteries treated as a single unit. EV1's battery pack contains 26 modules.

BPM   Battery Pack Monitor

Monitors state of charge, temperature and other vital battery readings. Communicates with charger to facilitate charging. (Attached to front of battery pack)

BTCM   Brake and Traction Control Module

Controls the braking, ABS, traction control, tire pressure monitoring system, and regenerative braking features of the vehicle. (Housed in PEB)

CCM   Convenience Charge Module

The 110-volt charger provided in the trunk of the lead acid EV1.

CP   Charge Port

Located at the nose of EV1, it is where the paddle is inserted to commence inductive charging.

Curb Weight

The empty weight of a vehicle, including batteries but excluding occupants and cargo.

DC   Direct Current

Electricity that flows in only one direction; this is the type of current that flows from a storage battery.

DSCM   Display, Steering & Chime Module

Instrument cluster that presents information on state of charge, range remaining, speed, odometer, instantaneous energy consumption and provides intelligence to the power steering system (EHPS) and also communicates with the RSA.

EV   Electric Vehicle

Typically, a vehicle powered by batteries and electric motor(s), qualified as a zero-emission vehicle.

EVS   EV Specialist

EV1 marketing area specialists that coordinate the leasing of EV1's, working with customers, Saturn retailers, and the local ACSP.

EHPS   Electro-Hydraulic Power Steering

Motor-driven, variable assist power steering system that provides more assistance at lower speeds, and less at higher speeds. The system includes a unique energy-saving feature, meaning it is programmed to only run as required, reducing energy by as much as 65% compared to a conventional hydraulic system. (Housed in PEB)

FMVSS   Federal Motor Vehicle Safety Standard (U.S.)

Safety standards that all new production vehicles must meet prior to public offering.

HTCM   Heating and Temperature Control Module

Manages heating, ventilating, and air conditioning.

HVAC   Heating, Ventilating and Air Conditioning

In EV1, this is controlled by the HTCM and heating or cooling is provided by the electric heat pump system.

IGBT   Insulated Gate Bipolar Transistor

Converts DC voltage into 3-phase AC voltage to power EV1's motor. (Housed in PEB)


Internal Combustion Engine


A device that converts AC electricity in DC electricity. Electric cars that have DC motors do not need an inverter; EV's using AC motors need the inverter to change the DC electricity from the batteries into AC for the motor. (Also see PIM, IGBT)

kW   Kilowatt

The international unit to measure power (not only electrical), a kilowatt is one thousand watts. One kW equals 1.34 horsepower; 746 watts equals 1 horsepower.

kWh   Kilowatt-hour

A kilowatt-hour is a unit of electrical energy or work, equal to that accomplished by one kilowatt acting for one hour.

PEB   Power Electronics Bay

Houses major electronics such as PIM, APM, PCM, and IGBT. (The big box under the hood)

PIM   Power Inverter Module

Controls the conversion of AC power to DC power and back again, working with IGBT and PCM. (Housed in PEB)

PCM   Propulsion Control Module

Controls the energy flow to the motor during propulsion and regenerative braking. Works with APM, BTCM, PIM, and IGBT. (Housed in PEB)

Regenerative Braking

A means to recover energy when slowing or stopping an electric vehicle. On cars equipped with such a system, when the brake pedal is pressed, the electric motor acts as a generator and sends a small amount of electricity back into the batteries.

RRIM   Reinforced Reaction-Injection Molded

Compound utilized for front and rear fascias, front fenders, rear quarter panels, rocker panels and rear wheel skirts.

SMC   Sheet Molding Compound

Fiberglass-reinforced-resin sheet molding compound that make up the hood, doors, roof and decklid.


Short/Long Arm Suspension

SDM   (Supplemental Inflatable Restraint Control Module)

Monitors sudden changes in acceleration and other factors necessary to trigger air bag inflation.

SCM   Standard Charge Module

220 volt floor and wall mount chargers

SOC   State of Charge (of battery pack)

Usually expressed as a percentage, it is the ratio of the energy remaining in the battery pack as compared to the energy in a fully charged pack.

SRIM   Structural Reaction-Injection Molded

Polyurethane compound that makes up the belly pan

SIR   Supplemental Inflatable Restraint

Air bag system

VRLA  Batteries   Valve-Regulated Lead-Acid

EV1's specially designed, sealed, 12-volt batteries. The valve-regulated designation refers to a one-way/pressure valve which permits small quantities of gas to escape from the battery during the vehicle's operation. These gasses are collected and vented safely under EV1's hood.


Vehicle Identification Number


A unit of electromotive force. One volt equals 1 watt per ampere.

ZEV   Zero emission Vehicle

A vehicle certified (by the state) to emit no pollutants into the atmosphere.

Copyright 2001 General Motors Corporation. All rights reserved.