mass airflow sensor
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Computer Science Clay
Active In SP
**

Posts: 712
Joined: Jan 2009
#1
07-06-2009, 01:30 AM


A mass airflow sensor is used to determine the mass of air entering the engine. The air mass information is necessary to calculate and deliver the correct fuel mass to the engine. Air is a gas, and its density changes as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the vehicle's operating environment, and is an ideal application for a mass sensor. (See stoichiometric, ideal gas law, and density.)

There are two common types of mass airflow sensors in usage on gasoline engines. They are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.

Both approaches are used almost exclusively on gasoline burning, EFI (electronic fuel injection) engines. Both sensor designs output a 0 - 5.0 volt signal that is proportional to the air mass flow rate, and both sensors have an IAT sensor (intake air temperature) incorporated into their housings.

When a MAF is used in conjunction with an exhaust gas oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop predicted air flow information (the measured air flow) to the engine's ECU, and the EGO sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
Reply
Zigbee
Active In SP
**

Posts: 153
Joined: Aug 2010
#2
02-09-2010, 08:39 PM

mass airflow sensor
The mass airflow sensors converts the air drawn into the engine into a voltage signal. The amount if air taken in is to e known by the ECM for calculating the engine load. Amount of fuel injected, ignition time of the cylinder, timing of shifting the transmission are all decided by this . The airflow sensor is located in the air intake stream, between the throttle body and the air cleaner, so that the amount of incoming air can be sensed.

OPERATION
a hot wire sensing element is utilised by the sensor to measure the amount of air entering the engine.when the incoming air cools the hot wire, a voltage signal is generated by the sensor and is sent to the PCM. The signal is used by the PCM to calculate the injector pulse width which controls the air/fuel ratio in the engine.a thin platinum wire wound on a ceramic bobbin and coated with glass is used as the sensing element in the hot wire type mass airflow meter. This hot wire is maintained at 392°F (200°C) above the ambient temperature as measured by a constant "cold wire''.


.pdf   Mass Air Flow Sensor (MAF).pdf (Size: 301.98 KB / Downloads: 96)
more details are also available at:
freeautomechanicmaf-mass-air-flow-sensor.html
samarinsglossary/airflow_sensor.html
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page

Quick Reply
Message
Type your reply to this message here.


Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  dual mass flywheel wiki jaseelati 0 257 06-02-2015, 04:48 PM
Last Post: jaseelati
  actinometer sensor jaseelati 0 121 05-02-2015, 02:31 PM
Last Post: jaseelati
  ir sensor in proteus jaseelati 0 110 30-12-2014, 01:13 PM
Last Post: jaseelati
  Hybrid Design Electrothermal Polymeric Microgripper with Integrated Force Sensor pdf study tips 0 453 20-06-2013, 03:23 PM
Last Post: study tips
  Recent Advances in MEMS Sensor Technology—Thermo-fluid and Electro-magnetic Devices study tips 0 467 02-05-2013, 12:32 PM
Last Post: study tips
  Mass Airflow Sensor computer science crazy 2 1,891 12-03-2013, 09:40 AM
Last Post: study tips
  VARIOUS SENSOR USED IN AUTOMOBILE PPT study tips 0 905 23-02-2013, 10:20 AM
Last Post: study tips
  mass airflow sensor computer science crazy 3 7,686 07-02-2013, 10:10 AM
Last Post: Guest
  How design cylinder to carry Mass 12460 kg project girl 0 368 01-02-2013, 02:18 PM
Last Post: project girl
  Fiber Optic Sensor Technology seminar flower 1 829 02-10-2012, 01:43 PM
Last Post: seminar flower