estimating said cooling amount, based on {HEAD ~ an estimation result} of {TAIL ~ said fuel cell}, when the step of detecting the temperature of said refrigerant malfunctions 
estimating said cooling amount , based on { HEAD ~ an estimation result } of { TAIL ~ said fuel cell } , when the step of detecting the temperature of said refrigerant malfunctions
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH