[Diy_efi] MAP Sensor

Wed Jul 24 05:38:55 GMT 2002

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Well I'll take a shot at it...

Engine load is basically the amount of air per revolution of the engine.
Usually the amount of air entering the engine is measured and then divided
by the engine's current speed, on the assumption that this will average out
to the amount of air consumed by the cylinders.

The airflow into the engine is usually measured either directly with an
airflow sensor (vane airflow sensor + air temperature sensor, or by a mass
airflow sensor), or by a method called "speed/density".  The speed/density
method measures the pressure in the intake manifold, the engine's speed, the
air temperature (and others?).  The various quantities are then fed to
hard-coded tables in the computer's memory which essentially encode the
volumetric efficiency of the engine and a wide variety of engine states.
The result of this integration operation is the current airflow into the
engine.

Did I miss anything?

 Andrew

on 7/23/02 10:00 PM, Matt Donohoe at mdonohoe at telpacific.com.au wrote:

Hi,

Could somebody give me a quick rundown as to how an engine determines "load"
?

Sorry it's a stupid and very basic question but I am still unsure of how
this is done.

Thanks to all who reply(maybe?)

____________________________________________________________________________
__________________
Matt Donohoe
donohoem at iprimus.com.au

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<HTML>
<HEAD>
<TITLE>Re: [Diy_efi] MAP Sensor</TITLE>
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Well I'll take a shot at it... 
 
Engine load is basically the amount of air per revolution of the engine. &n=
bsp;Usually the amount of air entering the engine is measured and then divid=
ed by the engine's current speed, on the assumption that this will average o=
ut to the amount of air consumed by the cylinders. 
 
The airflow into the engine is usually measured either directly with an air=
flow sensor (vane airflow sensor + air temperature sensor, or by a mass airf=
low sensor), or by a method called &quot;speed/density&quot;. &nbsp;The spee=
d/density method measures the pressure in the intake manifold, the engine's =
speed, the air temperature (and others?). &nbsp;The various quantities are t=
hen fed to hard-coded tables in the computer's memory which essentially enco=
de the volumetric efficiency of the engine and a wide variety of engine stat=
es. &nbsp;The result of this integration operation is the current airflow in=
to the engine. 
 
Did I miss anything? 
 
 &nbsp;Andrew 
 
 
on 7/23/02 10:00 PM, Matt Donohoe at mdonohoe at telpacific.com.au wrote: 
 
<BLOCKQUOTE>Hi, 
 
Could somebody give me a quick rundown as to how an engine d=
etermines &quot;load&quot; ? 
 
Sorry it's a stupid and very basic question but I am still u=
nsure of how this is done. 
 
Thanks to all who reply(maybe?) 
 
____________________________________________________________=
__________________________________ 
Matt Donohoe 
donohoem at iprimus.com.au 
 
</BLOCKQUOTE> 
</BODY>
</HTML>

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