Coolant fan control for fuel cell systems
First Claim
1. A fan control system for a fuel cell cooling system of the type having a first coolant loop and a second coolant loop, the fan control system comprising:
- a first sensor generating a first input signal as a function of a coolant heat energy in a first coolant loop;
a second sensor generating a second input signal as a function of a coolant temperature in a second coolant loop; and
a controller including a first control circuit receiving said first input signal and generating a first control signal having a high state and a low state, a second control circuit receiving said second input signal and generating a second control signal having a high state and a low state, and a fan control circuit receiving said first and second control signals and generating a fan enable signal when at least one of said first and second control signals are in said high state, and generating a fan disable control signal when both said first and second control signals are in said low state.
13 Assignments
0 Petitions
Accused Products
Abstract
A control system and method for operating a cooling fan in a coolant system of fuel cell power plant having a high temperature coolant loop and a low temperature coolant loop. The fan controller generates a fan control signal based on a first control signal from the high temperature coolant loop and a second control signal from the low temperature coolant loop. The first control signal is a function of the waste heat energy in the high temperature coolant loop, and the second control signal is a function of the temperature in the low temperature coolant loop. The fan control signal may also be generated based on a third control signal which is a function of a localized ambient temperature such as the under hood temperature of a vehicle.
44 Citations
24 Claims
-
1. A fan control system for a fuel cell cooling system of the type having a first coolant loop and a second coolant loop, the fan control system comprising:
-
a first sensor generating a first input signal as a function of a coolant heat energy in a first coolant loop;
a second sensor generating a second input signal as a function of a coolant temperature in a second coolant loop; and
a controller including a first control circuit receiving said first input signal and generating a first control signal having a high state and a low state, a second control circuit receiving said second input signal and generating a second control signal having a high state and a low state, and a fan control circuit receiving said first and second control signals and generating a fan enable signal when at least one of said first and second control signals are in said high state, and generating a fan disable control signal when both said first and second control signals are in said low state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A cooling system for a fuel cell power plant comprising:
-
a radiator having a first radiator section in fluid communication with a first coolant loop and a second radiator section in fluid communication with a second coolant loop and a fan disposed adjacent said radiator and operable to pass air through said first and second radiator sections; and
a fan control system including;
a first sensor generating a first input signal as a function of a coolant heat energy in a first coolant loop;
a second sensor generating a second input signal as a function of a coolant temperature in a second coolant loop; and
a controller including a first control circuit receiving said first input signal and generating a first control signal having a high state and a low state, a second control circuit receiving said second input signal and generating a second control signal having a high state and a low state, and a fan control circuit receiving said first and second control signals and generating a fan enable signal to turn said fan on when at least one of said first and second control signals are in said high state, and generating a fan disable control signal to turn said fan off when both said first and second control signals are in said low state. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for controlling a fan in a cooling system of a fuel cell power plant, the method comprising:
-
determining a heat energy of a coolant in a first coolant loop;
determining a coolant temperature of a coolant in a second coolant loop;
generating a first control signal having a high state when said heat energy is above a predetermined level and a low state when said heat energy is below said predetermined level;
generating a second control signal having a high state when said coolant temperature is above a predetermined temperature and a low state when said coolant temperature is below said predetermined temperature;
enabling a fan when at least one of said first and second control signals are in said high state; and
disabling said fan when both said first and second control signals are in said low state. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
determining a localized ambient temperature;
generating a third control signal having a high state when said localized ambient temperature is above a predetermined temperature and a low state when said localized ambient temperature is below said predetermined temperature;
enabling a fan when at least one of said first, second and third control signals are in said high state; and
disabling said fan when all of said first, second and third control signals are in said low state.
-
-
23. The method of claim 22 wherein the step of determining a localized ambient temperature includes determining a plurality of localized ambient temperatures and determining a maximum localized ambient temperature for such plurality of localized ambient temperatures.
-
24. The method of claim 22 wherein the step of generating a third control signal further comprises generating said third control signal having a high state when said localized ambient temperature is above a first predetermined temperature and a low state when said localized ambient temperature is below a second predetermined temperature, said second predetermined temperature being less than said first predetermined temperature.
Specification