Cooling System of Power Converter for On- Vehicle Rotary Electric Machine
First Claim
1. A cooling system of a power converter for an on-vehicle rotary electric machine comprising:
- a cooling circuit which has a circulation pump to circulate a coolant containing antifreeze solution and cools down, by using the coolant, a power element mounted in a power converter for an on-vehicle rotary electric machine;
a heat quantity calculation unit which calculates heat quantity generated by the power element;
a first temperature acquisition unit which acquires temperature of the power element;
a second temperature acquisition unit which acquires temperature of the coolant;
a heat transfer rate calculation unit which calculates, on the basis of the heat quantity, the temperature of the power element, and the temperature of the coolant, a heat transfer rate that is an amount of heat transferred from the power element to the coolant per unit temperature difference; and
a pump control unit which decreases an amount of the coolant discharged by the circulation pump when the heat transfer rate calculated is greater than a predetermined heat transfer rate reference.
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Accused Products
Abstract
A cooling system includes a cooling circuit that has a circulation pump circulating a coolant containing antifreeze solution and cools down, by means of the coolant, a power element mounted in a power converter for an on-vehicle rotary electric machine; a control signal calculation unit that calculates heat quantity generated by the power element; a power element temperature sensor that detects the temperature of the power element; and a coolant temperature sensor that detects the temperature of the coolant. The control signal calculation unit calculates, on the basis of the heat quantity, the temperature of the power element, and the coolant temperature, power element cooling performance that is the amount of heat transferred from the power element to the coolant per unit temperature difference, and lowers the driving power of the circulation pump when the calculated power element cooling performance is greater than a predetermined criterion.
14 Citations
20 Claims
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1. A cooling system of a power converter for an on-vehicle rotary electric machine comprising:
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a cooling circuit which has a circulation pump to circulate a coolant containing antifreeze solution and cools down, by using the coolant, a power element mounted in a power converter for an on-vehicle rotary electric machine; a heat quantity calculation unit which calculates heat quantity generated by the power element; a first temperature acquisition unit which acquires temperature of the power element; a second temperature acquisition unit which acquires temperature of the coolant; a heat transfer rate calculation unit which calculates, on the basis of the heat quantity, the temperature of the power element, and the temperature of the coolant, a heat transfer rate that is an amount of heat transferred from the power element to the coolant per unit temperature difference; and a pump control unit which decreases an amount of the coolant discharged by the circulation pump when the heat transfer rate calculated is greater than a predetermined heat transfer rate reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification