Vehicle Rooftop Engine Cooling System and Method
An vehicle rooftop cooling system includes a radiator located outside of the engine compartment of a vehicle, the radiator having a liquid coolant inside the radiator; a fan coupled to the radiator and configured to extract hot air from the radiator; a first sensor proximate to the radiator configured to measure coolant temperature of the coolant in the radiator; and a controller communicably coupled to the first sensor, the controller configured to receive inputs from the first sensor, to make determinations based on the received inputs, and to communicate control signals across a controller area network (CAN) in response to said determinations, wherein the controller is further configured to communicate a first control signal to cool the liquid coolant upon determining that the first sensor has measured temperature above a threshold.
1 . A vehicle rooftop cooling system, comprising:
a radiator located on the rooftop of the vehicle, the radiator having a liquid coolant inside the radiator;
a fan coupled to the radiator and configured to extract hot air from the radiator;
a first sensor in or proximate to the radiator configured to measure coolant temperature of the coolant in or proximate to the radiator;
a controller communicably coupled to the first sensor, the controller configured to receive inputs from the first sensor, to make determinations based on received inputs, issue control signals in response to said determinations, and to communicate across a Controller Area Network (CAN).
2 . The vehicle rooftop cooling system of claim 1 , wherein the fan is a variable-speed fan.
3 . The vehicle rooftop cooling system of claim 1 , wherein the first sensor includes multiple sensors configured to measure one or more of coolant temperature going into radiator, coolant temperature leaving radiator, coolant flow rate, coolant pressure, ambient temperature, fan current draw, fan blockage, cooling air flow rate, objects in the coolant, bubbles in coolant, quality of coolant, vibration of rooftop components.
4 . The vehicle rooftop cooling system of claim 1 , further comprising a second sensor located remotely from the radiator;
wherein the controller is communicably coupled to the second sensor via the Controller Area Network (CAN), and the controller is further configured to receive inputs from the second sensor.
5 . The vehicle rooftop cooling system of claim 4 , wherein the second sensor includes multiple sensors, the multiple sensors including at least one of the following sensors: temperature sensor, mass flow sensor, current sensor, pressure sensor, optical sensor, vibration sensor, and chemical sensor.
6 . The vehicle rooftop cooling system of claim 4 , further comprising a third sensor configured to measure at least one condition of a braking resistor of the vehicle;
wherein the controller is communicably coupled to the third sensor via the Controller Area Network (CAN), and the controller is further configured to receive inputs from the third sensor;
wherein the second sensor is configured to measure at least one condition of an engine of the vehicle.
7 . The vehicle rooftop cooling system of claim 1 , wherein the controller is further configured to communicate cooling system information over the Controller Area Network (CAN) to at least one of a vehicle computer and a vehicle diagnostic unit.
8 . The vehicle rooftop cooling system of claim 1 , wherein communicating across a Controller Area Network (CAN) includes receiving inputs via the Controller Area Network (CAN); and
wherein the controller is further configured to operate as a forward-feedback control to anticipate a future cooling need.
9 . The vehicle rooftop cooling system of claim 8 , wherein forward-feedback control signals are responsive to one or more of: braking resistor activation/deactivation, accelerator activation/deactivation, brake pedal activation/deactivation, vehicle passenger compartment heating/cooling system activation/deactivation, electrical loads applied/removed to/from electrical accessories, vehicle location information, and road conditions.
10 . The vehicle rooftop cooling system of claim 1 , wherein the controller comprises a Programmable Logic Controller (PLC).
11 . The vehicle rooftop cooling system of claim 10 , wherein the first sensor includes multiple sensors, and the Programmable Logic Controller (PLC) receives inputs from the multiple sensors to determine one or more of: fan performance, or lack thereof, fan faults, coolant pump performance, or lack thereof, coolant pump failure, radiator performance, or lack thereof, radiator blockage, and overall cooling performance.
12 . The vehicle rooftop cooling system of claim 10 , wherein the Programmable Logic Controller (PLC) is configured to perform one or more of the following: modify operation of one or more fans, shut off one or more fans, modify operation of a coolant pump, shut off the coolant pump, modify operation of or de-rate at least one hybrid drive component, re-calibrate one or more fans to operate on a revised expected performance curve based on measured conditions, re-calibrate the coolant pump to operate on a revised expected performance curve based on measured conditions, trigger the cooling system to activate early in anticipation of an imminent cooling need, communicate information to other vehicle systems, and alert a vehicle operator of measured conditions.
13 . A method of controlling a vehicle rooftop cooling system including: a radiator for liquid coolant, a fan coupled to the radiator to extract hot air, a first sensor in or proximate to the radiator configured to measure temperature, a controller communicably coupled to the first sensor and configured to receive inputs from the first sensor, to make determinations based on received inputs, and to communicate across a Controller Area Network (CAN), the method comprising:
receiving inputs from the first sensor,
making determinations based on received inputs,
issuing control signals in response to said determinations, and
communicating across a Controller Area Network (CAN).
14 . The method of claim 13 , wherein the first sensor includes multiple sensors, the method further comprising at least one of: measuring coolant temperature going into radiator, measuring coolant temperature leaving radiator, measuring coolant flow rate through the radiator, measuring coolant pressure in or near the radiator, measuring ambient temperature near the radiator, measuring fan current draw, measuring fan blockage, measuring cooling air flow rate across the radiator, measuring objects in the coolant, measuring bubbles in coolant, measuring quality of coolant, and measuring vibration of rooftop components.
15 . The method of claim 14 , wherein the vehicle rooftop cooling system further includes a second sensor located remotely from the radiator, and wherein the controller is communicably coupled to the second sensor and configured to receive inputs from the second sensor, the method further comprising receiving inputs from the second sensor via the Controller Area Network (CAN).
16 . The method of claim 15 , wherein the second sensor includes multiple sensors, the method further comprising at least one of: measuring coolant temperature; measuring coolant mass flow; measuring electrical current; measuring coolant pressure; measuring optical qualities of the coolant; measuring vibration; and, measuring chemical qualities of the coolant.
17 . The method of claim 15 , wherein the vehicle rooftop cooling system further includes a third sensor configured to measure at least one condition of a braking resistor of the vehicle, wherein the controller is communicably coupled to the third sensor and configured to receive inputs from the third sensor, and wherein the second sensor is configured to measure at least one condition of an engine of the vehicle, the method further comprising receiving inputs from the third sensor via the Controller Area Network (CAN).
18 . The method of claim 13 , wherein the communicating across a Controller Area Network (CAN) comprises communicating cooling system information over the Controller Area Network (CAN) to at least one of: a vehicle computer and a vehicle diagnostic unit.
19 . The method of claim 13 , wherein the communicating across a Controller Area Network (CAN) includes receiving inputs via the Controller Area Network (CAN), the method further comprising operating the controller as a forward-feedback control to anticipate a future cooling need.
20 . The vehicle rooftop cooling system of claim 19 , wherein forward-feedback control signals are responsive to receiving inputs related to one or more of: braking resistor activation/deactivation, accelerator activation/deactivation, brake pedal activation/deactivation, vehicle passenger compartment heating/cooling system activation/deactivation, electrical loads applied/removed to/from electrical accessories, vehicle location information, and road conditions.
21 . The method of claim 13 , wherein the controller comprises a Programmable Logic Controller (PLC), the method further comprising programming the Programmable Logic Controller (PLC) to control the vehicle rooftop cooling system.
22 . The method of claim 21 , wherein the first sensor includes multiple sensors, the method further comprising:
receiving inputs from the multiple sensors; and
determining one or more of: fan performance, or lack thereof, fan faults, coolant pump performance, or lack thereof, coolant pump failure, radiator performance, or lack thereof, radiator blockage, and overall cooling performance.
23 . The method of claim 21 further comprising one or more of the following:
modifying operation of one or more fans;
shutting off one or more fans;
modifying operation of a coolant pump;
shutting off the coolant pump;
modifying operation of or de-rate at least one hybrid drive component;
re-calibrating one or more fans to operate on a revised expected performance curve based on measured conditions;
re-calibrating the coolant pump to operate on the revised expected performance curve based on measured conditions;
triggering the cooling system to activate early in anticipation of an imminent cooling need;
communicating information to other vehicle systems, and
alerting a vehicle operator of measured conditions.