The EV1 was a technology tour de force, anticipating the need for safety features such as tire-pressure monitoring and pedestrian warning, as well as pioneering advanced creature comfort and convenience features. Here's a look at 10 things that made the EV1 energy-efficient, safe and comfortable.
1. HVAC system. For heating, ventilating and air conditioning, the EV1 used a heat pump that was smaller than but similar to what is used in many homes. Outside air was routed through a radiator and heat exchanger, which provided heated air for the interior. Cool air was created by taking warmer air from the interior and passing it through a radiator, which removed heat.
2. Heat-reducing glass. To keep the interior temperature down, the EV1 was equipped with thermal glass windows that rejected ultraviolet rays. Moderate interior temperatures reduced the energy needed by the HVAC system.
3. Ability to precondition the cabin temperature. With the EV1 plugged in and charging, the driver could program the HVAC system to warm or cool the interior. That helped save energy once the car was disconnected from the grid.
4. Electric-hydraulic power steering. Saving energy was the motivation behind every mechanical component. When the EV1 was driving straight, the steering system consumed no power. GM used a small electric motor to spin the hydraulic power steering pump.