Abstract: A location determinative method and system for controlling an engine to automatically regulate cabin temperature within a parked vehicle that is equipped with a heating/cooling apparatus, the method including determining the current location of the vehicle using a satellite navigation system, retrieving from memory location-specific parameters of engine operation and automatically controlling idling of the engine, in compliance with locally applicable law, for the purpose of enabling the heating/cooling apparatus to maintain a desirable cabin temperature.

Abstract: A method and system for controlling an engine in order to maintain a comfortable cabin temperature within a vehicle that is equipped with an engine, a battery and a heating/cooling apparatus including determining an acceptable range of cabin temperatures, monitoring cabin and outside air temperatures, controlling automatic starting of the vehicle engine when both temperatures are outside of the acceptable range and running the engine only as is minimally necessary to maintain the cabin temperature within the acceptable range.