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US 10,873,098 B2Granted
Fuel cell system and method of identifying power leakage area
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiromu Saito, Keiichi Toriumi
Life of this patent
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Abstract
When reduction of insulation resistance is detected, an FC positive side relay is opened, and a switching element is turned OFF. When the insulation resistance has returned to a normal value as a result of the relay opening and the switching element turning OFF, it is identified that the power leakage is occurring in the area between the positive side relay and the diode.
Claims10
A fuel cell system comprising:
- a fuel cell stack;
- a diode that prevents backflow of current to a positive electrode of the fuel cell stack;
- a relay circuit including:
- a negative side relay corresponding to a negative electrode of the fuel cell stack;
- and
- a positive side relay arranged between the positive electrode of the fuel cell stack and the diode;
- a power leakage detector configured to output a power leakage detection signal to be input to the fuel cell stack via the negative side relay, and detect reduction of insulation resistance;
- and
- a controller programmed to control opening/closing of the positive side relay, control opening/closing of the negative side relay, and acquire a detection result from the power leakage detector,
- wherein the controller is further programmed to execute isolation processing by opening the positive side relay when the reduction of the insulation resistance is detected in a state where the positive side relay and the negative side relay are closed, and to identify that power leakage is occurring in an area between the positive side relay and the diode when the insulation resistance has returned to a normal value as a result of the isolation processing.
7 more elements
A fuel cell system comprising:
- a fuel cell stack;
- a diode that prevents backflow of current to a positive electrode of the fuel cell stack;
- a switching element disposed between the fuel cell stack and the diode and having a function of switching a conductive state between wiring connected to a negative electrode of the fuel cell stack and wiring connected to the positive electrode of the fuel cell stack;
- a relay circuit disposed between the fuel cell stack and the switching element, the relay circuit including a positive side relay corresponding to the positive electrode of the fuel cell stack, and a negative side relay corresponding to the negative electrode of the fuel cell stack;
- a power leakage detector configured to output a power leakage detection signal to be input to the fuel cell stack via the negative side relay, and detect reduction of insulation resistance;
- and
- a controller programmed to control opening/closing of the positive side relay, control opening/closing of the negative side relay, control the switching element, and acquire a detection result from the power leakage detector,
- wherein the controller is further programmed to execute isolation processing by opening the positive side relay, opening the negative side relay, and by putting the switching element in an isolated state when the reduction of the insulation resistance is detected in a state where the positive side relay and the negative side relay are closed, to execute conduction control by putting the switching element in a conductive state while maintaining a state where the positive side relay and the negative side relay are open when the insulation resistance has returned to a normal value as a result of the isolation processing, and to identify that power leakage is occurring in an area between the positive side relay and the diode when the reduction of the insulation resistance occurs as a result of the conduction control by putting the switching element in the conductive state.
5 more elements
Dependencies are inferred from the claim text.