Patent ID: 9664605
Date: 2017-05-30
CPC Classifications: F02D,G01N

Claim:
1. A fuel density detection device comprising: a pulsation detection unit configured to detect, as an actual characteristic, a pulsation frequency of a pressure pulsation, which is caused in a fuel pressure, or a physical quantity, which corresponds to the pulsation frequency, according to a sensor signal from a pressure sensor, the pressure sensor configured to detect the fuel pressure of fuel supplied to a fuel injection valve, which is equipped to an internal combustion engine; a storage unit configured to store, as a reference characteristic, a reference frequency of a predetermined reference pulsation or a physical quantity, which corresponds to the reference frequency; and a density detection unit configured to detect a fuel density according to a quantity of deviation between the reference characteristic, which is stored in the storage unit, and the actual characteristic, which is detected with the pulsation detection unit.