Short term fuel trim - Revision history

Nyet: /* Notes */

2007-07-13T04:20:06Z

Notes

← Older revision		Revision as of 04:20, 13 July 2007
Line 43:		Line 43:
	O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.		O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.

	[STFT]s can be monitored using [VAG-COM] channel 033.		[[STFT]]s can be monitored using [[VAG-COM]] channel 033.

	[[Category:Fueling]]		[[Category:Fueling]]

Nyet: /* Notes */

2007-07-13T04:19:50Z

Notes

← Older revision		Revision as of 04:19, 13 July 2007
Line 42:		Line 42:

	O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.		O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.

			[STFT]s can be monitored using [VAG-COM] channel 033.

	[[Category:Fueling]]		[[Category:Fueling]]

Nyet at 20:43, 3 September 2006

2006-09-03T20:43:47Z

← Older revision		Revision as of 20:43, 3 September 2006
Line 43:		Line 43:
	O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.		O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.

	[[Category:~~Tuning~~]]		[[Category:Fueling]]

Nyet: /* Notes */

2006-09-02T00:30:42Z

Notes

← Older revision		Revision as of 00:30, 2 September 2006
Line 42:		Line 42:

	O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.		O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.

			[[Category:Tuning]]

Nyet: Short Term Fuel Trim moved to Short term fuel trim

2006-08-30T00:36:24Z

Short Term Fuel Trim moved to Short term fuel trim

← Older revision		Revision as of 00:36, 30 August 2006
(No difference)

Pansgor at 00:32, 30 August 2006

2006-08-30T00:32:27Z

← Older revision		Revision as of 00:32, 30 August 2006
Line 8:		Line 8:
	engineers at the factory from extensive dynamometer testing and are stored in a "weighted STFT value		engineers at the factory from extensive dynamometer testing and are stored in a "weighted STFT value
	array(1)" in the drive maps. When the STFT reaches the limit of its adjustment it will cause corresponding		array(1)" in the drive maps. When the STFT reaches the limit of its adjustment it will cause corresponding
	decrease or increase to the Long Term Fuel Trim. If the correction to the base value exceeds +25% or -25%		decrease or increase to the [[Long Term Fuel Trim]]. If the correction to the base value exceeds +25% or -25%
	for longer than 10 seconds a DTC is set for rich or lean stop for STFT.		for longer than 10 seconds a DTC is set for rich or lean stop for STFT.

Pansgor at 00:31, 30 August 2006

2006-08-30T00:31:51Z

@@ Line 1: / Line 1: @@
-This is the control of Injection Pulse Time Open (ti) (also called Injection Pulse Width) over the entire range
+This is the control of the Injection Pulse Time Open over the mid to upper range of engine operation. When
-of engine operation. It is primarily calculated at idle or low load mid range engine operation and is averaged
+the engine operates at normal or higher load or at higher engine speeds, larger volumes of fuel and air are
 O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.

Pansgor at 00:28, 30 August 2006

2006-08-30T00:28:10Z

New page

This is the control of Injection Pulse Time Open (ti) (also called Injection Pulse Width) over the entire range
of engine operation. It is primarily calculated at idle or low load mid range engine operation and is averaged
over time.
In these idle/low load conditions the amount of fuel variation is small due to the relatively small amount of air
input. The computer monitors the O2 sensor and ADDS or SUBTRACTS approximately 0.001msec to the
injection pulse time (ti) in order to maintain a Lambda = 1. This amount of increase or decrease of the
injection pulse width is known as the Adaptation Value. This is the value output by the ECU when reading
the live data stream.
For example: An LTFT of 1 is the factory spec for a new injector's injection pulse width (time open). This
corresponds to an LTFT Adaptation Value of 0.0.
An LTFT Adaption Value of 0.100 would indicate a wider injection pulse width. This corresponds to a LTFT
of 1.100.
An LTFT Adaption Value of -0.020 would indicate a narrower injection pulse width. This corresponds to a
LTFT of 0.980.
The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).

O2 readings have no control over ECU activity during [[open loop]] operation. In order to change fueling during open loop, the entire fuel map would have to be changed, or tools like [[Lemmiwinks]] can be used.