Air compressor system control

A power pack connectable to a vehicle air system, the power pack comprising:

• a filtered air supply;
• an air compressor;
• a temperature sensor positioned to sense a temperature at or near an outlet of the air compressor;
• a pressure sensor positioned to sense a pressure downstream of the outlet of the air compressor;
• a valve operatively connected to the outlet of the air compressor and positioned external to the air compressor;
• an engine turbo compressor downstream of and operatively connected to the outlet of the air compressor, wherein the valve is positioned on a feedback air loop to permit air flow from the outlet of the air compressor to the engine turbo compressor;
• and
• a controller configured to open the valve upon the pressure exceeding a cut-out threshold or the temperature exceeding a temperature threshold to permit air to flow through the valve along the feedback air loop to the engine turbo compressor.

An air system comprising:

• an air compressor configured to receive a filtered air;
• a turbo compressor downstream of and operatively connected to an outlet of the air compressor via an engine, the turbo compressor configured to provide compressed air for the engine;
• a temperature sensor positioned at or near the outlet of the air compressor and configured to sense a temperature at or near the outlet of the air compressor;
• a first valve operatively connected to the outlet of the air compressor, wherein the first valve is external to the air compressor and is located on a feedback air loop to the turbo compressor;
• connectors downstream of the compressor, the temperature sensor and the valve as defined by a direction of flow of air through the system, wherein the connectors are configured to allow air from the air compressor to pass therethrough;
• an air reservoir downstream of the connectors, wherein the air reservoir is configured to hold pressurized air from the air compressor;
• and
• a second valve located upstream of the air reservoir and operatively connected to the outlet of the air compressor, wherein the second valve is configured to permit flow of air to bypass the air reservoir if the pressurized air is above a threshold pressure;
• a controller configured to monitor the sensed temperature at the outlet of the air compressor and control the first valve to permit air to flow from the outlet of the air compressor through the first valve to the turbo compressor to unload the air compressor if the sensed temperature exceeds a threshold temperature, wherein the controller is configured to monitor the pressure and control the second valve to permit flow of air to bypass the air reservoir if the pressurized air is above the threshold pressure and the controller is configured to monitor the pressure and control the second valve to charge the air reservoir if the pressurized air is less than a cut-in threshold.