초록 ▼

An abnormality detection apparatus for a Rankine cycle system includes: a gas-liquid separator that separates a cooling medium that circulates in an internal combustion engine into a gas-phase and a liquid-phase; a superheater that gives waste heat of the engine to the cooling medium; a waste heat r

An abnormality detection apparatus for a Rankine cycle system includes: a gas-liquid separator that separates a cooling medium that circulates in an internal combustion engine into a gas-phase and a liquid-phase; a superheater that gives waste heat of the engine to the cooling medium; a waste heat recoverer that recovers energy of waste heat of the cooling medium; a valve provided in a passageway; a liquid surface sensor that detects liquid surface level of the liquid-phase cooling medium in the gas-liquid separator; a vapor temperature sensor that detects temperature of the gas-phase cooling medium in the superheater; and an ECU that determines whether the valve is abnormal on the basis of the amount of the liquid-phase cooling medium and the temperature of the gas-phase cooling medium if abnormality of the cooling medium supply portion of the engine is not detected.

대표청구항 ▼

1. An abnormality detection apparatus for a Rankine cycle system, comprising: a main body of an internal combustion engine which vaporizes a cooling medium that circulates in the internal combustion engine by giving waste heat to the cooling medium;a gas-liquid separator that, downstream of the main

1. An abnormality detection apparatus for a Rankine cycle system, comprising: a main body of an internal combustion engine which vaporizes a cooling medium that circulates in the internal combustion engine by giving waste heat to the cooling medium;a gas-liquid separator that, downstream of the main body, separates the cooling medium into a gas-phase cooling medium and a liquid-phase cooling medium;a superheater that, downstream of the gas-liquid separator, gives waste heat of the internal combustion engine to the gas-phase cooling medium and the liquid-phase cooling medium;a waste heat recoverer that, downstream of the superheater, recovers energy of the waste heat that the cooling medium receives;a control valve provided in a liquid-phase cooling medium passageway which connects the gas-liquid separator and the superheater, and through which the liquid-phase cooling medium separated by the gas-liquid separator passes;a cooling medium amount detector that detects amount of the liquid-phase cooling medium in the gas-liquid separator;a temperature detector that detects temperature of the gas-phase cooling medium in the superheater;a cooling medium supply abnormality detection portion that detects whether there is abnormality of a cooling medium supply portion that supplies the cooling medium to the main body; anda control valve abnormality detection portion that detects whether there is abnormality in the control valve based on the amount of the liquid-phase cooling medium in the gas-liquid separator and the temperature of the gas-phase cooling medium in the superheater if abnormality in the cooling medium supply abnormality detection portion is not detected. 2. The abnormality detection apparatus according to claim 1, wherein the control valve abnormality detection portion detects that there is abnormality in the control valve if the amount of the liquid-phase cooling medium in the gas-liquid separator is outside a predetermined range and the temperature of the gas-phase cooling medium in the superheater is outside a predetermined range. 3. The abnormality detection apparatus according to claim 2, wherein the control valve abnormality detection portion detects that the control valve is fixed in an open valve state, if the amount of the liquid-phase cooling medium in the gas-liquid separator is less than a first threshold value and the temperature of the gas-phase cooling medium in the superheater is less than a second threshold value. 4. The abnormality detection apparatus according to claim 2, wherein the control valve abnormality detection portion detects the control valve is fixed in a closed valve state, if the amount of the liquid-phase cooling medium in the gas-liquid separator is greater than a third threshold value and the temperature of the gas-phase cooling medium in the superheater is higher than a fourth threshold value. 5. An abnormality detection method for a Rankine cycle system that includes: a main body of an internal combustion engine which vaporizes a cooling medium that circulates in the internal combustion engine by giving waste heat to the cooling medium; a gas-liquid separator that, downstream of the main body, separates the cooling medium into a gas-phase cooling medium and a liquid-phase cooling medium; a superheater that, downstream of the gas-liquid separator, gives waste heat of the internal combustion engine to the gas-phase cooling medium and the liquid-phase cooling medium; a control valve provided in a liquid-phase cooling medium passageway which connects the gas-liquid separator and the superheater, and through which the liquid-phase cooling medium separated by the gas-liquid separator passes; and a cooling medium supply portion that supplies the cooling medium to the main body, the abnormality detection method comprising: detecting amount of the liquid-phase cooling medium in the gas-liquid separator;detecting temperature of the gas-phase cooling medium in the superheater;detecting whether there is abnormality of the cooling medium supply portion; anddetecting whether there is abnormality of the control valve based on the amount of the liquid-phase cooling medium in the gas-liquid separator and the temperature of the gas-phase cooling medium in the superheater if abnormality of the cooling medium supply portion is not detected.