ATR 1.60 (Exhaust Gas Temperature Control) - Revision history

TTQS at 19:52, 22 May 2012

2012-05-22T19:52:31Z

MattDanger at 22:04, 29 September 2011

2011-09-29T22:04:39Z

TTQS at 17:23, 11 September 2011

2011-09-11T17:23:40Z

TTQS at 17:21, 11 September 2011

2011-09-11T17:21:01Z

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TTQS at 17:16, 11 September 2011

2011-09-11T17:16:46Z

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TTQS at 17:11, 11 September 2011

2011-09-11T17:11:28Z

TTQS at 17:08, 11 September 2011

2011-09-11T17:08:26Z

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TTQS: Created page with "See the funktionsrahmen for the following diagrams: atr-main exhaust gas temperature control overview atr-atrbb detection of control range atr-atrb exhaust gas temperature con..."

2011-09-09T15:18:11Z

Created page with "See the funktionsrahmen for the following diagrams: atr-main exhaust gas temperature control overview atr-atrbb detection of control range atr-atrb exhaust gas temperature con..."

New page

See the funktionsrahmen for the following diagrams:

atr-main exhaust gas temperature control overview

atr-atrbb detection of control range

atr-atrb exhaust gas temperature control for cylinder bank 1

atr-atrerb enabling exhaust gas temperature control for cylinder bank 1

atr-atrpi exhaust gas temperature proportional/integral control for cylinder bank 1

atr-atrb2 exhaust gas temperature control for cylinder bank 2

atr-atrerb2 enabling exhaust gas temperature control for cylinder bank 2

atr-atrpi2 exhaust gas temperature proportional/integral control for cylinder bank 2

atr-atrnl limp mode for exhaust gas temperature control

atr-atrko coordination of the control output

ATR 1.60 Function Description

Task:

Protection of components (manifold, turbocharger, etc.) by controlling the exhaust gas temperature. By means of this control, the general enrichment at high load and speed ("full-load enrichment") can be reduced. When general mixture control is insufficient, the exhaust gas temperature control enrichment must also be invoked which leads to reduced fuel consumption.

Principle:

An excessively high exhaust gas temperature can be lowered by enriching the air-fuel mixture. Through this enrichment, more fuel enters the cylinder than is required for stoichiometric combustion of the fuel. The unburned fuel vaporises on the cylinder walls and cools them, whereby the exhaust gas temperature decreases. For this control, the exhaust gas temperature is measured using an exhaust gas temperature sensor or estimated by an exhaust gas temperature model.

As long as the exhaust temperature is below the threshold temperature, there is no control. Thus, there is only a "down regulation" of the exhaust temperature, not an "up regulation". If the desired temperature is reached or exceeded, the control switches. To achieve an enrichment of the mixture, the controller is adjusted to give a desired value of lambda in the "rich" region. This enrichment decreases the exhaust gas temperature, and the controller sets the desired exhaust temperature. When the exhaust temperature drops back below the threshold temperature, the controller takes back the enrichment. If enrichment is no longer required, control is switched off.

Overview of Codeword CATR:

<table>
<tr>
<td>
Bit No.
</td>
<td>
7
</td>
<td>
6
</td>
<td>
5
</td>
<td>
4
</td>
<td>
3
</td>
<td>
2
</td>
<td>
1
</td>
<td>
</td>
</tr>
<tr>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
*
</td>
</tr>
</table>

*If the value of bit 0 is set equal to 1, this enables exhaust gas temperature control.

ATRBB: Detection Control Range

This function detects the valid control range. Via the configuration byte CATR, the control can, in principle, be switched off. A valid range is usually present when the end of start conditions is detected (B_stend = 1), and the relative load (rl) lies above an applicable threshold rlatr. This control scheme is only available in the near-full load range (rl > rlatr) is active, since exhaust temperatures are only likely to be high in this range. Once the range is exited, control is switched off, e.g. in the transition to idle to shorten the duration of the enrichment.

The valid control range is indicated by the flag B_atrb = 1.

ATRERB: Enabling Exhaust Gas Temperature Control for Bank 1

The exhaust gas temperature control is a flip-flop on or off. The condition flag B_atr = 1 indicates that control is active. If the exhaust gas temperature (tabg) is greater than or equal to the applicable threshold value TABGSS, the control is switched on. The control is switched off when enrichment is no longer required. This is the case when the regulator output dlatr > 0. The controller output dlatr for the exhaust temperature control is then set to zero. It is possible to set a lean limit for the control scheme via the fixed value LATRO. If the current set-lambda without add. If the current desired lambda value without additional lamvoa parts above the limit LATRO (in the lean range) there will be no control. In addition, there is no control if any of the following conditions are met:

(a) No valid control range is detected (B_atrb = 0)

(b) Fuel injector cut-off condition is true (B_bevab = 1)

(c) The exhaust gas temperature sensor indicates an error (E_ats = 1)

(d) The exhaust gas temperature sensor is not ready (B_atsb = 0)

(e) Significant differences between the bank controller control variables were found (E_atrd = 1).

If the engine reaches the rich running limit (B_lagf = 1) while exhaust gas temperature control is active (B_atr = 1), a further enrichment attempt is prohibited by the control scheme (B_atrsp = 1). The current value of the controller output is recorded. However, an enrichment reduction is allowed.

ATRPI2: Exhaust Gas Temperature Proportional/Integral Control for Cylinder Bank 1

The exhaust gas temperature controller is configured as a PI controller, because the "delta lambda controller" intervenes additively. ATRP and ATRI are applied amplification factors for the P and I components. When control is switched off (B_atr = 0) the controller output is set to zero. The integral component in this case is set to equal the negative value of the proportional component (dlatri = -dlatrp), so it follows that the sum is zero. The controller output (dlatr) will be limited to "rich" by the applicable limit DLATRMN. In this case, the integrator is suspended. The exhaust gas temperature tabg falls below the threshold temperature TABGSS or the control is turned off (B_atr = 0), the integrator will be released. When the controller is inhibited (B_atrsp = 1), the last value of controller output (dlatr) is recorded. The integral part is calculated so that the controller output is constant even when a control error remains (dlatri = dlatr - dlatrp).

ATRERB2: Enabling Exhaust Gas Temperature Control for Cylinder Bank 2

As per cylinder bank 1

ATRPI2: Exhaust Gas Temperature Proportional/Integral Control for Cylinder Bank 2

As per cylinder bank 1

ATRNL: Limp Mode for Exhaust Gas Temperature Control

In the event that an exhaust gas temperature sensor fails or is not ready, a limp mode variable (dlatrnl) is provided. The delta lambda target of interest for the limp mode is in the characteristic DLATRNL.

ATRKO: Control Output Coordination

If there is no error in the exhaust gas temperature sensors before, the controller outputs dlatr or dlatr2 through the function outputs dlamatr or dlamatr2 are transferred to lambda coordination. Once a sensor failure (E_ats = 1 or E_ats2 = 1) or the sensors are not operational (B_atsb = 0), or significant bank differences of the controller variables (E_atrd = 1 or E_atrd2 = 1) is detected, the ATR-control range (B_atrb = 1) the limp mode variable dlatrnl are transferred to both banks of lambda coordination.

ATR 1.60 Application Notes

Requirements:

- Application of lambda control

Applications Tools:

VS100

Preassignment of the Parameters:

Erkennung Regelbereich:

- Codeword CATR = 01 (hexadecimal) = 1 (decimal) enable control

- Minimum load for exhaust gas temperature control map KFRLATR (x: engine speed/rpm, y: intake air temperature/ C, z:%)

<table>
<tr>
<td>
</td>
<td>
2000
</td>
<td>
3000
</td>
<td>
4000
</td>
<td>
5000
</td>
<td>
6000
</td>
</tr>
<tr>
<td>
10
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
35
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
60
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
85
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
109
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
</table>

Enable exhaust gas temperature control for cylinder bank 1/bank 2:

- Threshold exhaust gas temperature for exhaust gas temperature control: TABGSS(2) = 1000 C

- Desired AFR upper limit for switching off exhaust gas temperature control: LATRO = 16.0

Exhaust gas temperature control for cylinder bank 1/bank 2:

- Threshold exhaust gas temperature for exhaust gas temperature control: TABGSS(2) = 1000 C

- Gain factor for proportional component exhaust gas temperature PI control: ATRP = 0.005 l/K

- Gain factor for integral component for exhaust gas temperature PI control: ATRI = 0.0005 l/(s K)

- Lower limit for exhaust gas temperature control: DLATRMN = -0.3

Exhaust gas temperature control limp mode:

- Delta lambda exhaust gas temperature control limp mode:

<table>
<tr>
<td>
Engine speed/rpm
</td>
<td>
2000
</td>
<td>
3000
</td>
<td>
4000
</td>
<td>
5000
</td>
<td>
6000
</td>
</tr>
<tr>
<td>
DLATRNL
</td>
<td>
-0.10
</td>
<td>
-0.13
</td>
<td>
-0.17
</td>
<td>
-0.20
</td>
<td>
-0.23
</td>
</tr>
</table>

Procedure:

Switching off the Function:

To prohibit exhaust gas temperature control set codeword CATR [Bit 0] equal to 0.

Affected Functions:

%LAMKO through dlamatr_w and dlamatr2_w

<table>
<tr>
<td>
Parameter
</td>
<td>
Description
</td>
</tr>
<tr>
<td>
ATRI
</td>
<td>
Gain factor (integral component), exhaust gas temperature control
</td>
</tr>
<tr>
<td>
ATRP
</td>
<td>
Gain factor (proportional component), exhaust gas temperature control
</td>
</tr>
<tr>
<td>
CATR
</td>
<td>
Configuration byte, exhaust gas temperature control
</td>
</tr>
<tr>
<td>
DLATRMN
</td>
<td>
Lower limit for exhaust gas temperature control
</td>
</tr>
<tr>
<td>
DLATRNLN
</td>
<td>
Delta lambda in limp mode, exhaust gas temperature control
</td>
</tr>
<tr>
<td>
KFRLATR
</td>
<td>
Minimum load for exhaust gas temperature control
</td>
</tr>
<tr>
<td>
LATRO
</td>
<td>
Desired lambda upper limit, exhaust gas temperature control
</td>
</tr>
<tr>
<td>
SY_STERVK
</td>
<td>
System constant condition flag for stereo pre-cat
</td>
</tr>
<tr>
<td>
TABGSS
</td>
<td>
Exhaust gas temperature threshold for exhaust gas temperature control
</td>
</tr>
<tr>
<td>
TABGSS2
</td>
<td>
Exhaust gas temperature threshold, exhaust gas temperature control, bank 2
</td>
</tr>
<tr>
<td>
Variable
</td>
<td>
Description
</td>
</tr>
<tr>
<td>
B_ATR
</td>
<td>
Condition flag for exhaust gas temperature control
</td>
</tr>
<tr>
<td>
B_ATR2
</td>
<td>
Condition flag for exhaust gas temperature control, cylinder bank 2
</td>
</tr>
<tr>
<td>
B_ATRB
</td>
<td>
Condition flag for valid operating range, exhaust gas temperature control
</td>
</tr>
<tr>
<td>
B_ATRNL
</td>
<td>
Condition flag for limp mode in exhaust gas temperature control
</td>
</tr>
<tr>
<td>
B ATRSP
</td>
<td>
Condition flag for exhaust gas temperature control disabled
</td>
</tr>
<tr>
<td>
B_ATRSP2
</td>
<td>
Condition flag for exhaust gas temperature control disabled, cylinder bank 2
</td>
</tr>
<tr>
<td>
B_ATSB
</td>
<td>
Condition flag for exhaust gas temperature sensor ready
</td>
</tr>
<tr>
<td>
B_BEVAB
</td>
<td>
Condition flag for fuel injector cut-off in cylinder bank 1
</td>
</tr>
<tr>
<td>
B_BEVAB2
</td>
<td>
Condition flag for fuel injector cut-off in cylinder bank 2
</td>
</tr>
<tr>
<td>
B_LALGF
</td>
<td>
Condition flag for "lambda rich" limit active
</td>
</tr>
<tr>
<td>
B_LALGF2
</td>
<td>
Condition flag for "lambda rich" limit active
</td>
</tr>
<tr>
<td>
B STEND
</td>
<td>
Condition flag for end of start conditions reached
</td>
</tr>
<tr>
<td>
DLAMATR2_W
</td>
<td>
Delta lambda for exhaust gas temperature control, cylinder bank 2
</td>
</tr>
<tr>
<td>
DLAMATR_W
</td>
<td>
Delta lambda for exhaust gas temperature control
</td>
</tr>
<tr>
<td>
DLATR2_W
</td>
<td>
Delta lambda for exhaust gas temperature control, cylinder bank 2
</td>
</tr>
<tr>
<td>
DLATRI2_W
</td>
<td>
Integral component, exhaust gas temperature PI control, cylinder bank 2
</td>
</tr>
<tr>
<td>
DLATRI_W
</td>
<td>
Integral component, exhaust gas temperature PI control
</td>
</tr>
<tr>
<td>
DLATRNL_W
</td>
<td>
Delta lambda in limp mode, exhaust gas temperature control
</td>
</tr>
<tr>
<td>
DLATRP2_W
</td>
<td>
Proportional component, exhaust gas temperature PI control, cylinder bank 2
</td>
</tr>
<tr>
<td>
DLATRP W
</td>
<td>
Proportional component, exhaust gas temperature PI control
</td>
</tr>
<tr>
<td>
DLATR_W
</td>
<td>
Delta lambda, exhaust gas temperature control
</td>
</tr>
<tr>
<td>
E_ATRD
</td>
<td>
Error flag: cylinder bank difference, exhaust gas temperature control
</td>
</tr>
<tr>
<td>
E_ATRD2
</td>
<td>
Error flag: cylinder bank difference, exhaust gas temperature control bank 2
</td>
</tr>
<tr>
<td>
E_ATS
</td>
<td>
Error flag: exhaust gas temperature sensor
</td>
</tr>
<tr>
<td>
E_ATS2
</td>
<td>
Error flag: exhaust gas temperature sensor, cylinder bank 2
</td>
</tr>
<tr>
<td>
LAMVOA2_W
</td>
<td>
Lambda pilot control without additive parts, cylinder bank 2
</td>
</tr>
<tr>
<td>
LAMVOA_W
</td>
<td>
Lambda pilot control without additive parts
</td>
</tr>
<tr>
<td>
NMOT
</td>
<td>
Engine speed
</td>
</tr>
<tr>
<td>
RL
</td>
<td>
Relative cylinder charge
</td>
</tr>
<tr>
<td>
RLATR
</td>
<td>
Load threshold for exhaust gas temperature control
</td>
</tr>
<tr>
<td>
TABG2_W
</td>
<td>
Exhaust gas temperature, cylinder bank 2
</td>
</tr>
<tr>
<td>
TABG_W
</td>
<td>
Exhaust gas temperature
</td>
</tr>
<tr>
<td>
TANS
</td>
<td>
Intake air temperature
</td>
</tr>
</table>

← Older revision		Revision as of 19:52, 22 May 2012
Line 20:		Line 20:

	atr-atrko coordination of the control output		atr-atrko coordination of the control output
		+

	<u>ATR 1.60 Function Description</u>		<u>ATR 1.60 Function Description</u>

← Older revision		Revision as of 22:04, 29 September 2011
Line 545:		Line 545:
	Intake air temperature		Intake air temperature
	\|}		\|}
		+
		+	[[Category:ME7]]

@@ Line 90: / Line 90: @@
 *If the value of bit 0 is set equal to 1, this enables exhaust gas temperature control.
-u>ATRBB: Detection Control Range</u>
+<u>ATRBB: Detection Control Range</u>
-This function detects the valid control range. Via the configuration byte CATR, the control can, in principle, be switched off. A valid range is usually present
+This function detects the valid control range. Via the configuration byte CATR, the control can, in principle, be switched off. A valid range is usually present when the end of start conditions is detected (B_stend = 1), and the relative load (rl) lies above an applicable threshold rlatr. This control scheme is only available in the near-full load range (rl &gt; rlatr) is active, since exhaust
-when the end of start conditions is detected (B_stend = 1), and the relative load (rl) lies above an applicable threshold rlatr. This control scheme is only
+temperatures are only likely to be high in this range. Once the range is exited, control is switched off, e.g. in the transition to idle to shorten the duration of the enrichment.
 available in the near-full load range (rl &gt; rlatr) is active, since exhaust
 temperatures are only likely to be high in this range. Once the range is
 exited, control is switched off, e.g. in the transition to idle to shorten the
 duration of the enrichment.
-The
+The valid control range is indicated by the flag B_atrb = 1.
 valid control range is indicated by the flag B_atrb = 1.
@@ Line 108: / Line 103: @@
-The
+The exhaust gas temperature control is a flip-flop on or off. The condition flag
 exhaust gas temperature control is a flip-flop on or off. The condition flag
 B_atr = 1 indicates that control is active. If the exhaust gas temperature (tabg)
 is greater than or equal to the applicable threshold value TABGSS, the control
@@ Line 121: / Line 115: @@
 following conditions are met:
+(a) No valid control range is detected (B_atrb = 0)
-(b)
-Fuel injector cut-off condition is true (B_bevab = 1)
+(b) Fuel injector cut-off condition is true (B_bevab = 1)
-(c)
-The exhaust gas temperature sensor indicates an error (E_ats = 1)
+(c) The exhaust gas temperature sensor indicates an error (E_ats = 1)
-(d)
-The exhaust gas temperature sensor is not ready (B_atsb = 0)
+(d) The exhaust gas temperature sensor is not ready (B_atsb = 0)
 (e)
-Significant differences between the bank controller control variables were
+(e) Significant differences between the bank controller control variables were
 found (E_atrd = 1).
-If
+If the engine reaches the rich running limit (B_lagf = 1) while exhaust gas
 the engine reaches the rich running limit (B_lagf = 1) while exhaust gas
 temperature control is active (B_atr = 1), a further enrichment attempt is prohibited
 by the control scheme (B_atrsp = 1). The current value of the controller output
@@ Line 150: / Line 134: @@
-<u>ATRPI2:
+<u>ATRPI2: Exhaust Gas Temperature Proportional/Integral Control for Cylinder Bank 1</u>
 Exhaust Gas Temperature Proportional/Integral Control for Cylinder Bank 1</u>
 The exhaust gas temperature controller is configured as a PI controller, because
 the &quot;delta lambda controller&quot; intervenes additively. ATRP and ATRI
@@ Line 170: / Line 152: @@
-<u>ATRERB2:
+<u>ATRERB2: Enabling Exhaust Gas Temperature Control for Cylinder Bank 2</u>
 Enabling Exhaust Gas Temperature Control for Cylinder Bank 2</u>
 As per cylinder bank 1
 As
 per cylinder bank 1
 <u>ATRPI2: Exhaust Gas Temperature Proportional/Integral Control for Cylinder Bank 2</u>
 <u>ATRPI2:
 Exhaust Gas Temperature Proportional/Integral Control for Cylinder Bank 2</u>
 As per cylinder bank 1
@@ Line 185: / Line 162: @@
 <u>ATRNL: Limp Mode for Exhaust Gas Temperature Control</u>
 In the event that an exhaust gas temperature sensor fails or is not ready, a limp mode variable (dlatrnl) is provided. The delta lambda target of interest for the limp mode is in the characteristic DLATRNL.
 In the event that an exhaust gas temperature sensor fails or is not ready, a limp
 mode variable (dlatrnl) is provided. The delta lambda target of interest for
 the limp mode is in the characteristic DLATRNL.
-<u>ATRKO: Control Output
+<u>ATRKO: Control Output Coordination</u>
 Coordination</u>
 If there is no error in the exhaust gas temperature sensors before, the controller
@@ Line 202: / Line 175: @@
 transferred to both banks of lambda coordination.
 <u>ATR 1.60 Application Notes</u>
 <u>Requirements:</u>
 - Application of lambda control
 Application of lambda control
 <u>Applications Tools:</u>
 VS100
 <u>Preassignment of the Parameters:</u>
 Erkennung Regelbereich:
 - Codeword CATR = 01 (hexadecimal) = 1 (decimal) enable control
-−
 Codeword CATR = 01 (hexadecimal) = 1 (decimal) enable control
 - Minimum load for exhaust gas temperature control map KFRLATR (x: engine
-−
 Minimum load for exhaust gas temperature control map KFRLATR (x: engine
 speed/rpm, y: intake air temperature/°C, z:%)
 {| border="1"
 |-

@@ Line 6: / Line 6: @@
 atr-atrbb detection of control range
-atr-atrb exhaust gas temperature control for
+atr-atrb exhaust gas temperature control for cylinder bank 1
 cylinder bank 1
-atr-atrerb enabling exhaust gas temperature control
+atr-atrerb enabling exhaust gas temperature control for cylinder bank 1
 for cylinder bank 1
-atr-atrpi exhaust gas temperature
+atr-atrpi exhaust gas temperature proportional/integral control for cylinder bank 1
 proportional/integral control for cylinder bank 1
-atr-atrb2 exhaust gas temperature control for
+atr-atrb2 exhaust gas temperature control for cylinder bank 2
 cylinder bank 2
-atr-atrerb2 enabling exhaust gas temperature control for
+atr-atrerb2 enabling exhaust gas temperature control for cylinder bank 2
 cylinder bank 2
-atr-atrpi2 exhaust gas temperature proportional/integral
+atr-atrpi2 exhaust gas temperature proportional/integral control for cylinder bank 2
 control for cylinder bank 2
-atr-atrnl limp mode for exhaust gas temperature
+atr-atrnl limp mode for exhaust gas temperature control
 control
 atr-atrko coordination of the control output
-<u>ATR
+<u>ATR 1.60 Function Description</u>
 .60 Function Description</u>
@@ Line 36: / Line 28: @@
-Protection
+Protection of components (manifold, turbocharger, etc.) by controlling the exhaust gas temperature.
 of components (manifold, turbocharger, etc.) by controlling the exhaust gas temperature.
 By means of this control, the general enrichment at high load and speed
 (&quot;full-load enrichment&quot;) can be reduced. When general mixture control
@@ Line 77: / Line 68: @@
+|
 Bit No.
+|
+|
+|
+|
+|
+|
+|
+|
 |-
+|
@@ Line 122: / Line 95: @@
+|
+*
 |}
-*If the value
+*If the value of bit 0 is set equal to 1, this enables exhaust gas temperature control.
 of bit 0 is set equal to 1, this enables exhaust gas temperature control.
 <u>ATRBB:
 Detection Control Range</u>
-This
+This function detects the valid control range. Via the configuration byte CATR, the
 function detects the valid control range. Via the configuration byte CATR, the
 control can, in principle, be switched off. A valid range is usually present
 when the end of start conditions is detected (B_stend = 1), and the relative load
@@ Line 144: / Line 112: @@
-The
+The valid control range is indicated by the flag B_atrb = 1.
 valid control range is indicated by the flag B_atrb = 1.
@@ Line 152: / Line 119: @@
-The
+The exhaust gas temperature control is a flip-flop on or off. The condition flag
 exhaust gas temperature control is a flip-flop on or off. The condition flag
 B_atr = 1 indicates that control is active. If the exhaust gas temperature (tabg)
 is greater than or equal to the applicable threshold value TABGSS, the control
@@ Line 166: / Line 132: @@
-(a)
+(a) No valid control range is detected (B_atrb = 0)
 No valid control range is detected (B_atrb = 0)
 (b) Fuel injector cut-off condition is true (B_bevab = 1)
 (b)
 Fuel injector cut-off condition is true (B_bevab = 1)
 (c) The exhaust gas temperature sensor indicates an error (E_ats = 1)
 (c)
 The exhaust gas temperature sensor indicates an error (E_ats = 1)
 (d) The exhaust gas temperature sensor is not ready (B_atsb = 0)
 (d)
 The exhaust gas temperature sensor is not ready (B_atsb = 0)
 (e) Significant differences between the bank controller control variables were
 (e)
 Significant differences between the bank controller control variables were
 found (E_atrd = 1).
 If the engine reaches the rich running limit (B_lagf = 1) while exhaust gas
 If
 the engine reaches the rich running limit (B_lagf = 1) while exhaust gas
 temperature control is active (B_atr = 1), a further enrichment attempt is prohibited
 by the control scheme (B_atrsp = 1). The current value of the controller output
@@ Line 198: / Line 153: @@
-The
+The exhaust gas temperature controller is configured as a PI controller, because
 exhaust gas temperature controller is configured as a PI controller, because
 the &quot;delta lambda controller&quot; intervenes additively. ATRP and ATRI
 are applied amplification factors for the P and I components. When control is
@@ Line 219: / Line 173: @@
-As
+As per cylinder bank 1
 per cylinder bank 1
-<u>ATRPI2:
+<u>ATRPI2: Exhaust Gas Temperature Proportional/Integral Control for Cylinder Bank 2</u>
 Exhaust Gas Temperature Proportional/Integral Control for Cylinder Bank 2</u>
-As
+As per cylinder bank 1
 per cylinder bank 1