| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection measuring device for realizing the calculation of a volume modulus by a simpler construction.SOLUTION: A closed vessel 1 filled with a fuel is equipped with two pressure sensors 5 for measuring a pressure change in the closed vessel 1, at a difference of a distance L from the injection port of an injection nozzle 2 for injecting a fuel to the closed vessel 1. A delay time calculation part 822 calculates the difference of the time, at which the pressure waves generated by the fuel injection of the injection nozzle 2 has arrived at the two pressure sensors 5. A sound velocity calculation unit 823 calculates the sound velocity v in the fuel of the closed vessel 1 from v=α×L/τ, and a volume modulus coefficient calculation part 824 calculates a volume modulus coefficient k from k=&rgr;×v. |
