INTRODUCCIÓN

“Engine Speed” This field displays current engine speed (rpm).

“Dither Steps” This field allows the user to pro-gram dither steps that allow the AFR system to oscillate around the stepper’s normal movements plus or minus a user-programmed number of steps (0 = OFF; 8 = ±8 steps; 12 = ±12 steps; 16 = ±16 steps;

20 = ±20 steps).

“Target Lambda” This field displays the target Lambda setpoint the AFR system is adjusting stepper position to maintain. The target Lambda is based on a Waukesha-calibrated value and a user off-set programmed in Field 12.

“Intake Mnfld LB” This field displays the engine’s intake manifold pressure. Units are in-Hg absolute (kPa absolute). If an intake manifold pressure sensor or wiring fault occurs, the status bar beneath this field signals an alarm (turns yellow) and provides a message to fix the sensor or wiring. NOTE:

When a sensor or wiring fault is detected, the field dis-plays a default value, not the actual value.

“Check Box for Left Bank Manual Mode” This field allows the user to change the AFR system mode of operation of the engine’s left bank from auto-matic to manual mode. Normally the AFR system operates in automatic mode; however, the user can click the check box, changing the system to manual mode. Manual mode allows the user to adjust stepper position using the arrow buttons (<< < > >>). When changed into manual mode, the AFR system will not make automatic stepper adjustments; it will only move stepper position with user adjustment. Check mark is ON; no check mark is OFF.

“Actual Lambda” This field displays actual Lambda. Lambda is equal to the amount of air present relative to that of a stoichiometric mixture. For example, a Lambda of 1.0000 is equal to an air/fuel ratio of approximately 16:1. Slightly rich of stoichiome-try, or a Lambda of 0.995, is the typical setpoint of cat-alyst engines.

“Left Bank Stepper Motor Setup” This field allows the user to program the correct left bank stepper motor for their engine. The length of the step-per motor shaft must be programmed so the AFR sys-tem knows the stepper motor range. The number of steps is dependent on engine configuration and fuel regulator model. The short shaft stepper has

“Primary Left Stepper Position” This field dis-plays the current position of the left bank step-per motor.

“Arrow Buttons” and “Home” The AFR sys-tem must be in manual mode for the user to use the left bank arrow buttons. The double arrow buttons (<< >>) move the stepper motor up or down in 400-step increments. The single arrow buttons (< >) move the stepper motor up or down in 25-step incre-ments. The home button moves the stepper motor to the home position and then back to the start position only when the engine is not running. If the user clicks on the home button while the engine is running, an error message appears.

“Start Position Left” This field displays the start position of the left bank stepper motor.

“Gain Adjust” This field allows the user to pro-gram the speed that the stepper motor reaches its setpoint. The range of adjustment is listed at the bottom of the programming table. The user can pro-gram the gain with this field to fine-tune both steady-state and transient AFR performance.

“Oxygen Target Lambda Offset” This field allows the user to program an offset to the Waukesha-calibrated target Lambda. By clicking on the “Edit…” button, a programming table is opened.

The user programs an offset based on intake manifold pressure by subtracting or adding a slight Lambda amount. The range of adjustment is listed at the bot-tom of the programming table. The user can program an offset with this field to fine-tune AFR performance.

“Stepper Position Edit Min/Max” This field allows the user to program minimum and maxi-mum stepper positions at various levels of intake man-ifold pressure. By clicking on the “Max…” or “Min…”

button, a programming table is opened. The AFR sys-tem adjusts the stepper motor between two program-mable limits to maintain the oxygen sensor voltage.

The minimum and maximum positions, which define the stepper motor adjustment range, are determined by establishing an air/fuel ratio curve. By defining the stepper motor adjustment range, the user can main-tain stable engine operation and set limits for trouble-shooting or indication of sensor wear.

Field descriptions continued on next page...

1

[F8] AFR SETUP PANEL DESCRIPTION

Figure 3.05-17 AFR Setup Panel in ESP – Fields 14 through 24

23

14 15

16 17

19

20

21 22

18

24

[F8] AFR SETUP PANEL DESCRIPTION – REFER TO FIGURE 3.05-17

“Check Box for Right Bank Manual Mode”

This field allows the user to change the AFR system mode of operation of the engine’s right bank from automatic to manual mode. Normally the AFR system operates in automatic mode; however, the user can click the check box, changing the system to man-ual mode. Manman-ual mode allows the user to adjust step-per position using the arrow buttons (<< < > >>). When changed into manual mode, the AFR system will not make automatic stepper adjustments; it will only move stepper position with user adjustment. Check mark is ON; no check mark is OFF.

“Intake Mnfld RB” This field displays the engine’s intake manifold pressure. Units are in-Hg absolute (kPa absolute). If an intake manifold pressure sensor or wiring fault occurs, the status bar beneath this field signals an alarm (turns yellow) and provides a message to fix the sensor or wiring. NOTE:

When a sensor or wiring fault is detected, the field dis-plays a default value, not the actual value.

“Right Bank Stepper Motor Setup” This field allows the user to program the correct right bank stepper motor for the engine. The length of the stepper motor shaft must be programmed so the AFR system knows the stepper motor range. The number of steps is dependent on engine configuration and fuel regulator model. The short shaft stepper has 5,800 steps (GSI engines); the long shaft stepper has 20,000 steps (GSID engines). This field will be set at the factory but can be reprogrammed by the user.

“Actual Lambda” This field displays actual Lambda. Lambda is equal to the amount of air present relative to that of a stoichiometric mixture. For example, a Lambda of 1.0000 is equal to an air/fuel ratio of approximately 16:1. Slightly rich of stoichiome-try, or a Lambda of 0.995, is the typical setpoint of cat-alyst engines.

“Start Position Right” This field displays the start position of the right bank stepper motor.

“Primary Right Stepper Position” This field displays the current position of the right bank stepper motor.

“Arrow Buttons” and “Home” The AFR sys-tem must be in manual mode for the user to use the right bank arrow buttons. The double arrow buttons (<< >>) move the stepper motor up or down in 400-step increments. The single arrow buttons (< >) move the stepper motor up or down in 25-step incre-ments. The home button moves the stepper motor to the home position and then back to the start position only when the engine is not running. If the user clicks on the home button while the engine is running, an error message appears.

“Stop Editing – Currently Editing” This button must be clicked prior to editing programmable (dark blue) fields in ESP. Clicking this button puts ESP in “editing mode.” The user will not be able to enter new values if ESP is not in editing mode. While in edit-ing mode, the button will read “Stop Editedit-ing – Currently Editing.” When the editing mode is off, the button will read “Start Editing.” See Section 3.10 ESP Program-ming “Basic ProgramProgram-ming in ESP” for more informa-tion.

“Save to ECU” This button is used to save pro-grammed values to NVRAM (permanent mem-ory) in the ECU. Changes saved to permanent memory will not be lost if power to the ECU is removed. See Section 3.10 ESP Programming “Sav-ing to Permanent Memory” for more information.

NOTE: Programmed values not saved to permanent memory are stored in RAM (temporary memory).

When values are in RAM, ESP can be closed and the PC disconnected from the ECU while keeping all changes; however, changes will be lost if power to the ECU is removed or when the engine is shut down.

“Undo Last Change” This button allows the user to reset the last change made while in edit-ing mode back to the programmed parameter that was last saved to permanent memory (NVRAM) in the ECU.

“Undo All Changes” This button allows the user to reset all the programmable fields back to the programmed parameters that were last saved to permanent memory (NVRAM) in the ECU.

14