ELECTRONIC THERMOSTAT

摘要

Provided are apparatus, including electronic thermostats, for detecting temperatures and elapsed times and, in response to those temperatures and elapsed times, controlling the opening or closing of an electric circuit.

主权项

1. An electronic thermostat for use in a mobile heat transfer system, comprising:
(a) a resistive element with a temperature dependent electrical resistance; and (b) a control circuit comprising a microprocessor;
wherein said resistive element(i) is configured for monitoring a temperature at an evaporator core of said mobile heat transfer system and(ii) is in electrical contact with said control circuit and is configured for thermal contact with said evaporator core,wherein said microprocessor(i) is programmed to limit a frequency at which a compressor of said mobile heat transfer system cycles,(ii) enables a first-type event that transitions said control circuit from a first state to a second state in response to an electrical resistance of the resistive element corresponding to a predetermined temperature of the evaporator core cut in point and(iii) enables a second-type event that transitions said control circuit from said second state to said first state in response to an electrical resistance of the resistive element corresponding to a predetermined temperature of the evaporator core cut out pointwherein a current first-type event does not occur until at least a first predetermined minimum time has elapsed since a prior second-type event and a first preset time delay has elapsed since the response to the electrical resistance corresponding to the predetermined temperature cut in point,wherein a current second-type event does not occur until at least a second predetermined minimum time has elapsed since a prior first-type event and a second preset time delay has elapsed since the response to the electrical resistance corresponding to the predetermined temperature cut out point andwherein said microprocessor is further programmed to enable a second-type event when the control circuit is in the second state and a source voltage connected to the control circuit is less than a predetermined voltage threshold.