Hvac system

Abstract

An HVAC system for a vehicle. The HVAC system includes a battery management controller, which can be used to run the components of the HVAC system when the engine of the vehicle is not running.

What is claimed is: 
     
         1 . An HVAC system to be installed in a vehicle comprising:
 a battery management controller comprising:   at least one connection for electrically coupling a first power source with a first voltage;   at least one connection for electrically coupling a second power source with a second voltage;   wherein the battery management controller is configured to run a temperature control system and to supply power to the temperature control system from a combination of the first and second power sources with a combined voltage, wherein the second power source is disconnected when the combined voltage drops below a predetermined amount.   
     
     
         2 . The HVAC system according to  claim 1 , wherein the second power source is at least one battery connected to an engine starter of the vehicle. 
     
     
         3 . The HVAC system of  claim 2 , wherein the first power source is at least one auxiliary battery. 
     
     
         4 . The HVAC system of  claim 3 , wherein the battery management controller is configured to gather historical data for any one of the at least one auxiliary battery and the at least one battery connected to the engine starter. 
     
     
         5 . The HVAC system of  claim 4 , wherein the historical data is maximum or average battery discharge. 
     
     
         6 . The HVAC system of  claim 3 , further comprising a display for showing current approximate battery charge of the at least one auxiliary battery or the at least one battery connected to the engine starter. 
     
     
         7 . The HVAC system of  claim 3 , further comprising a combination/separation device configured to connect the at least one auxiliary battery to the engine starter to assist the at least battery connected to the engine starter during start up of the vehicle if the at least one battery connected to the engine starter is weakened such that the vehicle has difficulty starting. 
     
     
         8 . The HVAC system of  claim 1  further comprising: a first power source; a compressor; a motor operatively coupled to the compressor; and a condenser in fluid communication with the compressor. 
     
     
         9 . The HVAC system of  claim 8 , wherein the first power source, the compressor, the motor, and the condenser are configured to be outside a cab of the vehicle as an exterior subsystem. 
     
     
         10 . The HVAC system of  claim 9 , wherein the exterior subsystem is configured to connect to a plurality of evaporators at one time. 
     
     
         11 . The HVAC system of  claim 10 , wherein the exterior subsystem is configured to connect to the vehicle's existing evaporator. 
     
     
         12 . The HVAC system of  claim 8 , wherein the compressor is a stepless variable speed compressor that is controlled by a power management controller. 
     
     
         13 . The HVAC system of  claim 8 , further comprising an evaporator in fluid communication with the condenser and a circulation blower configured to flow air past the evaporator. 
     
     
         14 . The HVAC system of  claim 13 , wherein the circulation blower is a stepless variable speed control that is controlled by a power management controller. 
     
     
         15 . The HVAC system of  claim 1 , further comprising an electric resistance heater. 
     
     
         16 . The HVAC system of  claim 1 , further comprising a reverse cycle heating system. 
     
     
         17 . The HVAC system of  claim 1 , wherein the battery management controller is configured to recharge the first and second power sources by using a charging device. 
     
     
         18 . The HVAC system of  claim 17 , wherein the battery management controller is configured to connect the first and second power sources to the charging device when the voltage of the first power source is above a predetermined level and to only connect the second power source to the charging device when the voltage of the first power source is below a predetermined level. 
     
     
         19 . The HVAC system of  claim 1 , wherein the predetermined amount is an amount dynamically determined based on ambient operating conditions 
     
     
         20 . An HVAC system to be installed in a vehicle comprising:
 a reverse cycle heating system; and   a battery management system configured to control the operation of the reverse cycle heating system when the engine of the vehicle is turned off.   
     
     
         21 . The system of  claim 19 , wherein the reverse cycle heating system is run entirely by battery power. 
     
     
         22 . An HVAC system to be installed in a vehicle comprising:
 a first power source;   a compressor;   a motor operatively coupled to the compressor;   a condenser; and   a power management controller configured to run the motor when the engine of the vehicle is turned off,   wherein the first power source, the compressor, the motor, and the condenser are configured to be outside a cab of the vehicle as an exterior subsystem.   
     
     
         23 . The HVAC system of  claim 22 , wherein the exterior subsystem is configured to connect to a plurality of evaporators at one time. 
     
     
         24 . The system of  claim 22 , wherein the exterior subsystem is configured to connect to the vehicle's existing evaporator.