[Diy_efi] Re: Diy_efi digest, Vol 1 #231 - 12 msgs
Bill Washington
bill.washington at nec.com.au
Thu Aug 8 13:18:34 GMT 2002
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Gents,
Perhaps I'm missing something, but wouldn't you get better performance, faster response and more accurate control if you used a pump capable of a pressure greater than the highest you are likely to require and an electronically controllable/variable pressure regulator with a return line?
Regards
Bill W
Date: Wed, 07 Aug 2002 22:00:09
To: diy_efi at diy-efi.org
From: Mike <erazmus at iinet.net.au>
Subject: Re: [Diy_efi] CIS EFI via Fuel Pump PWM
Reply-To: diy_efi at diy-efi.org
At 07:54 AM 7/8/2002 -0500, you wrote:
>>>> You are forgetting the rotational
>>>> inertia of the pump rotor... and the propensity for the fuel pressure
>>>> regulator to oscillate during a step change in flow/pressure, most outlets
>>
>>
>>The point was to PWM the pump and get rid of the regulator. And the
>>inertia of the pump rotor isn't affected by the length of fuel line.
>
Furthermore - I doubt you could fully do away with a pressure regulator
if you wanted optimum response to WOT and transients in respect of WCS
- but it would be an alternative to PWM the injectors - nonetheless
I wouldn't want to do it that way as its dead easy to PWM injectors...
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<pre wrap="">Gents,<br>Perhaps I'm missing something, but wouldn't you get better performance, faster response and more accurate control if you used a pump capable of a pressure greater than the highest you are likely to require and an electronically controllable/variable pressure regulator with a return line?<br><br>Regards<br>Bill W<br><br> Date: Wed, 07 Aug 2002 22:00:09
To: <a class="moz-txt-link-abbreviated" href="mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</a>
From: Mike <a class="moz-txt-link-rfc2396E" href="mailto:erazmus at iinet.net.au"><erazmus at iinet.net.au></a>
Subject: Re: [Diy_efi] CIS EFI via Fuel Pump PWM
Reply-To: <a class="moz-txt-link-abbreviated" href="mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</a>
At 07:54 AM 7/8/2002 -0500, you wrote:
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""><span class="moz-txt-citetags">>> </span>You are forgetting the rotational
<span class="moz-txt-citetags">>> </span>inertia of the pump rotor... and the propensity for the fuel pressure
<span class="moz-txt-citetags">>> </span>regulator to oscillate during a step change in flow/pressure, most outlets
</pre>
</blockquote>
<pre wrap=""><span class="moz-txt-citetags">></span>
<span class="moz-txt-citetags">></span>The point was to PWM the pump and get rid of the regulator. And the
<span class="moz-txt-citetags">></span>inertia of the pump rotor isn't affected by the length of fuel line.
</pre>
</blockquote>
<pre wrap=""><!---->
Furthermore - I doubt you could fully do away with a pressure regulator
if you wanted optimum response to WOT and transients in respect of WCS
- but it would be an alternative to PWM the injectors - nonetheless
I wouldn't want to do it that way as its dead easy to PWM injectors...</pre>
<br>
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