A cooling system for a hybrid power system that includes an engine employs an engine cooling circuit to deliver coolant to the engine, the engine cooling circuit including a radiator and a main fan to draw air through the radiator. When the hybrid power system further includes an inverter, then the
A cooling system for a hybrid power system that includes an engine employs an engine cooling circuit to deliver coolant to the engine, the engine cooling circuit including a radiator and a main fan to draw air through the radiator. When the hybrid power system further includes an inverter, then the inverter is cooled via an inverter cooling circuit that is formulated as one portion of the cooling system to deliver coolant to the inverter, the inverter cooling circuit including a heat exchanger located such that the main fan draws air through the heat exchanger when the main fan is active. The cooling system also includes a secondary fan to selectively draw air though the heat exchanger during operation of an inverter cooling circuit coolant pump.
대표청구항▼
What is claimed is: 1. A cooling system comprising: an engine; an engine cooling circuit to deliver coolant to the engine, the engine cooling circuit including a radiator and a main fan to draw air through the radiator of the engine cooling circuit; an inverter; an inverter cooling circuit to deliv
What is claimed is: 1. A cooling system comprising: an engine; an engine cooling circuit to deliver coolant to the engine, the engine cooling circuit including a radiator and a main fan to draw air through the radiator of the engine cooling circuit; an inverter; an inverter cooling circuit to deliver coolant to the inverter, the inverter cooling circuit including a heat exchanger located such that the main fan draws air through the heat exchanger when the main fan is active; a secondary fan to selectively draw air through the heat exchanger of the inverter cooling circuit, and a controller configured to control operation of the secondary fan; the main fan and optionally the secondary fan being configured to draw cooling air across the heat exchanger of the inverter cooling circuit during modes when the engine is running, and the controller being configured to operate the secondary fan to selectively draw air through the heat exchanger of the inverter cooling circuit during modes when the engine is not running. 2. The cooling system according to claim 1, wherein the engine is adapted to develop electrical energy as part of a hybrid power system. 3. The cooling system according to claim 1, wherein the inverter is coupled to a bank of DC batteries. 4. The cooling system according to claim 1, wherein the engine cooling circuit and the inverter cooling circuit are coupled to a common coolant tank. 5. The cooling system according to claim 1, wherein the secondary fan is an electric fan. 6. The cooling system according to claim 1, wherein the controller turns the secondary fan on whenever a coolant pump to drive coolant through the inverter cooling circuit is active. 7. The cooling system according to claim 1, wherein the engine is a generator engine. 8. A cooling system comprising: an engine; an engine cooling circuit to deliver coolant to the engine, the engine cooling circuit including a radiator and a main fan to draw air through the radiator of the engine cooling circuit; an inverter; an inverter cooling circuit to deliver coolant to the inverter, the inverter cooling circuit including a coolant pump operatively coupled to a heat exchanger, the coolant pump to drive coolant though the inverter cooling circuit, the heat exchanger located such that the main fan draws air through the heat exchanger when the main fan is active; a secondary fan to selectively draw air through the heat exchanger of the inverter cooling circuit; a controller configured to control operation of the secondary fan; the main fan and optionally the secondary fan being configured to draw cooling air across the heat exchanger of the inverter cooling circuit during modes when the engine is running, and the controller being configured to operate the secondary fan to selectively draw air through the heat exchanger of the inverter cooling circuit during modes when the engine is not running, and the controller being configured to turn the secondary fan of the inverter cooling circuit on whenever the coolant pump is active. 9. The cooling system according to claim 8, wherein the engine is adapted to develop electrical energy as part of a hybrid power system. 10. The cooling system according to claim 8, wherein the inverter is coupled to a bank of DC batteries. 11. The cooling system according to claim 8, wherein the engine cooling circuit and the inverter cooling circuit are coupled to a common coolant tank. 12. The cooling system according to claim 8, wherein the secondary fan is an electric fan. 13. The cooling system according to claim 8, wherein the engine is a generator engine. 14. The cooling system according to claim 8, wherein the controller turns the pump on based on a predetermined threshold value of at least one of a temperature and current sensed at the inverter. 15. The cooling system according to claim 8, wherein the controller turns the pump on if any one of multiple temperature points or currents are above a pre-determined threshold. 16. The cooling system according to claim 14, wherein the predetermined threshold value includes any one of a temperature value of a boost Mosfet temperature, a main IGBT temperature, a charger IGBT temperature, and includes any one of a boost current and an inverter output current. 17. The cooling system according to claim 15, wherein the multiple temperature points include any one of a temperature of a boost Mosfet at 60 degrees Celsius; a temperature of a main IGBT at 65 degrees Celsius; a temperature of a charger IGBT at 50 degree Celsius and the multiple currents include any one of a boost current at 250 Amps and a inverter output current at 30 Amps. 18. The cooling system according to claim 8, wherein the controller turns the pump off if a difference between a temperature point of any one of a charger IGBT, a main IGBT, or a boost Mosfet and a temperature point of a cold plate are below a threshold value. 19. The cooling system according to claim 18, wherein the threshold value includes any one of 5 degrees Celsius difference between the temperature point of the boost Mosfet and the cold plate, 3 degrees Celsius difference between the temperature point of the charger IGBT and the cold plate, and 5 degrees Celsius difference between the temperature point of the main IGBT and the cold plate. 20. The cooling system according to claim 8, wherein the controller is configured to produce a fault signal when the controller determines no coolant is available to the pump based on temperature levels of the cooling system, pump operation status, battery voltage and pump current.
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