Title:
熱式流量測定装置
Document Type and Number:
Japanese Patent JP7034285
Kind Code:
B2
Abstract:
In a gas flow rate measurement device attached in an intense temperature environment in which there is significant intake pulsation, temperature dependence differs between a reverse flow side and a forward flow side, and the problem therefore arises that precision of temperature characteristic correction in the pulsating environment is inadequate only on the forward flow side. In the present invention, a detection element capable of detecting forward/reverse flow, and a map for correcting a detected intake air flow rate are provided, and an intake air flow rate signal is forward/reverse corrected in accordance with a temperature signal of an intake air temperature detection element for detecting the intake air temperature, whereby the flow rate of drawn-in air can be detected with high precision without the intake air temperature being affected, even in a pulsating-flow environment with significant temperature variation.
Inventors:
Kazunori Suzuki
Kotabe Akira
Kotabe Akira
Application Number:
JP2020528734A
Publication Date:
March 11, 2022
Filing Date:
June 05, 2019
Export Citation:
Assignee:
Hitachi Astemo, Ltd.
International Classes:
G01F1/696
Domestic Patent References:
| JP2002295292A | ||||
| JP2004012358A | ||||
| JP2005345346A | ||||
| JP5344446A | ||||
| JP2001324364A | ||||
| JP2004226289A | ||||
| JP9236464A | ||||
| JP2007071889A |
Attorney, Agent or Firm:
Hiraki International Patent Office