| 摘要 |
Provided is a system for determining a number of particles, which has a simplified and compact structure as well as a reduced cost. The system comprises a diluter (PND2) arranged at a connecting point of a main flow channel (ML) and a dilution gas flow channel (DL), a dilution gas flow rate control part (MFC3) that controls the flow rate of the dilution gas introduced into the diluter (PND2), a particle number measuring unit (2) that measures a number of solid particles in a diluted exhaust gas, a bypass flow channel (BL3) that bifurcates from between the diluter (PND2) and the particle number measuring unit (2) in the main flow channel (ML) and in which a constant flow rate unit (CFO3) is arranged, a suction pump (P) that is connected downstream of a converged point of the main flow channel (ML) and the bypass flow channel (BL3), and an information processing unit (4) that calculates the dilution factor of the exhaust gas based on a dilution gas flow rate (Q1) controlled by the dilution gas flow rate control part (MFC3), and a total of a unit flow rate (Q2) of the particle number measuring unit (2) and a set flow rate (Q3) of the constant flow rate unit (CFO3).
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