METHOD AND APPARATUS TO DETERMINE AN EFFECTIVE TEMPERATURE OF COOLANT FLUID FOR A HEAT GENERATING DEVICE

摘要

A method for dynamically monitoring temperature of a fluid at a heat generating device includes monitoring, using a temperature sensor, temperature of the fluid held in a fluidic sump. A first fluidic flow rate and a second fluidic flow rate are determined. A third fluidic flow rate and a temperature drop of the fluid across the heat exchanger in the active coolant circuit are determined based upon the temperature of the fluid and the third fluidic flow rate through the active coolant circuit. A fluid temperature supplied to the electric machine through the active coolant circuit is determined based upon the third fluidic flow rate and the temperature drop of the fluid across the heat exchanger. An effective temperature of the fluid is determined based upon the temperature of the fluid in the sump and the temperature of the fluid supplied to the electric machine through the active coolant circuit.

主权项

1. A method for dynamically monitoring temperature of fluid employed in a cooling system for a heat generating device, the cooling system including a fluidic pump fluidly connected to a passive coolant circuit and an active coolant circuit each in fluidic communication with the heat generating device, wherein the active coolant circuit includes a heat exchanger, a passive bypass control valve and a bypass circuit, the method comprising:
monitoring, using a temperature sensor, temperature of the fluid held in a fluidic sump supplying the fluid to the fluidic pump; determining a first fluidic flow rate through the passive coolant circuit and a second fluidic flow rate through the active coolant circuit; determining a third fluidic flow rate and a temperature drop of the fluid across the heat exchanger in the active coolant circuit based upon the temperature of the fluid and the third fluidic flow rate through the active coolant circuit; determining a fluid temperature supplied to the heat generating device through the active coolant circuit based upon the third fluidic flow rate and the temperature drop of the fluid across the heat exchanger; and determining an effective temperature of the fluid based upon the temperature of the fluid in the sump and the temperature of the fluid supplied to the heat generating device through the active coolant circuit.