Thermal-type air flow measuring instrument with fluid-direction

Details Thermal-type air flow measuring instrument with fluid-direction Thermal-type air flow measuring instrument with fluid-direction

1995-10-18

1997-12-09

Dombroske, George M.

Measuring and testing

Volume or rate of flow

Proportional

731182, G01F 168, G01M 1500

Patent

active

056963211

ABSTRACT:
There is disclosed a thermal-type air flow measuring instrument which judges whether the direction of flow of a fluid, ranging from a static flow to a pulsating flow involving a reverse flow, is forward or reverse, and outputs a signal corresponding to the flow rate of the fluid, thereby measuring the flow rate with high precision. An auxiliary passage is provided in a fluid passage, and is constituted by first, second and third passageways. Two temperature sensing resistors are mounted respectively at an upstream side and a downstream side within the first passageway in close proximity to each other. Most of the fluid, flowed into the first passageway in a forward direction, flows through the second passageway. The third passageway serves to direct a reverse flow of the fluid toward the temperature sensing resistors. Results of measurement of the flow rate of intake air in an internal combustion engine indicate that a minus error due to a pulsating flow, experienced in the conventional construction, is eliminated almost completely, and that a plus error due to a reverse flow is reduced to about 1/10.

REFERENCES:
patent: 4478075 (1984-10-01), Oyama et al.
patent: 4974445 (1990-12-01), Arai et al.
patent: 5355726 (1994-10-01), Zurek et al.
patent: 5467648 (1995-11-01), Igarashi et al.

Affiliated with

Also associated with

Rating

Thermal-type air flow measuring instrument with fluid-direction does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Thermal-type air flow measuring instrument with fluid-direction , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal-type air flow measuring instrument with fluid-direction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1609502