Sm2 Autronic.pdf

AUTRONIC SM2

LAPTOP CALIBRATION / DIAGNOSIS SOFTWARE RELEASE 3.27/3.29

The software utility supplied with Autronic SM2 and SM3 ECU may be used with any IBM

compatible computer that is operating under MS-DOS 3.0 or later. The computer must have

the following hardware:-

i. VGA graphics adaptor.

ii. Minimum of 2MB random access memory.

iii. One serial communications port.

iv. One 3.5" any capacity or 5.25" high capacity floppy disk

drive.

The following functions are available using this program:

1. Real-time display of the current operating status of the ECU

and engine.

2. Display of error/fault condition history information recorded

in the ECU and the cancellation of stored error history.

3. Display of the relative timing of the engine position reference

signals for ease of setup.

4. Calibration adjustment:-

1. Non-interactive calibration of the ECU (offline calibration

editing).

ii. Interactive calibration of the ECU (online calibration

editing).

iii. Disk file storage and retrieval of calibrations.

iv. Free transfer of calibrations between file, screen and ECU.

V. Calibration process does not effect normal ECU operation

ie:- No hickups during online adjustment.

vi. Calibration may be password secured in ECU to prevent

unauthorised access.

vii. User I.D. may be included with calibration in ECU for ease

of future identification.

The calibration features accessible with this version of the program are as listed

below. All tabular calibrations may have a user selected table size from 1 X 1 = 1

variable up to the maximum specified for each table. The program allows calibration

tables (or maps) to be defined with variable spacing of the calibration grid points.

Mapping detail can be fine where engine charactistics vary dramatically and course where

engine charactistics are well behaved. This ensures that precise calibration is acheived

with a minimum of effort. Variable mapping precision if achieved by allowing arbitary

choise of the calibration axis site values. The program allows the building of larger

tables by the, insertion of table rows and/or columns as more calibration detail is

required. Calibrations, other than the base fuel and ignition tables, maybe initialized

with default values to eliminate the complexity of these enhanced features in

applications where only the basic features, are required.

BASE FUEL DELIVERY CALIBRATION

Basic fuel delivery calibration table providing fine (0.1%) adjustment of fuel. This

table, the engine "load", barometric pressure and corrections dependent upon intake and

coolant temperature, acceleration and deceleration and external trims determine the

actual rate of fuel delivery for all engine operating conditions. The table data values

being a representation of the engines "Volumetric efficiency" allows considerable

simplification of the calibration procedure. Up to 32 engine speed and 16 engine load

dependent calibration sites may be chosen at random calibration intervals giving up to

512 adjustment points. The engine load variable used in this table and others that

follow below is a function of throttle position if throttle position is chosen as the

primary input, and a function of manifold absolute pressure if pressure is the primary

input.

BASE IGNITION TIMING CALIBRATION

Basic ignition timing calibration table for "normal" engine operation, excluding

cranking, idling and over-run conditions. The table uses the same site calibrations as

the base fuel delivery table and therefore is of equal size. Timing is selectable in

0.25 Degrees increments over a range from 0 to 50 Degrees crank angle. The calibration

from this table is combined with temperature dependent corrections and. an external trim

to produce the actual engine "running" ignition timing.

OVERRUN IGNITION TIMING CALIBRATION

Engine speed dependent ignition timing calibration for stable combustion under closed

throttle conditions. The adjustment range is the same as the base ignition timing

calibration table above. The table comprises a single row using the same engine speed

calibration sites as the base fuel delivery table above.

CRANKING IGNITION TIMING CALIBRATION

Ignition timing for engine cranking calibration allows the selection of an engine speed

dependent timing characteristic that minimizes the possiblity of starter gear damage due

to engine kick-back, yet aids in the rapid acceleration of the engine up to running

speed. The range of calibration is as for the base ignition table and up to 5 engine

speed calibration sites may be chosen.

IDLING IGNITION TIMING CALIBRATION

Idling ignition timing calibration allows optimal timing during this condition for good

idle quality and improved idle speed stability. The range of calibration is as for the

base ignition table and up to 5 engine speed calibration sites may be chosen.

COOLANT IGNITION TIMING MODIFIER CALIBRATION

Base ignition timing modification dependent upon engine coolant temperature and engine

load to ensure efficient operation during warm-up and to minimize the possibility of

engine damage if over-heating occurs. Table size is 12 engine coolant temperature

calibration sites by 6 engine load calibration sites and the correction range is +/-

31.75 degrees.

ALTITUDE IGNITION TIMING MODIFIER CALIBRATION

Base ignition timing modification dependent upon barometric pressure and engine load to

ensure efficient operation at high altitude. Table size is 7 engine load calibration

sites by 2 barometric pressure calibration sites and the correction range is +/- 31.75

degrees.

FUEL INJECTION DELIVERY TIMING

Calibration of the actual positioning of the fuel injection pulse within the engine

cycle, dependent upon engine speed and engine load. Calibration may be selected at up to

20 engine speed sites and 5 engine load sites with a resolution of 2.8 crankshaft

degrees.

INDIVIDUAL CYLINDER FUEL DELIVERY TRIMMING

Individual calibration trim tables for each injection group (ie:-cylinder) to correct

for injector calibration differences or individual cylinder efficiency differences due

to non-ideal manifolding. These tables share common calibrations sites with the

injection timing calibration data (20 X 5) and allow +/- 61% adjustment range in 0.4%

increments..

MANIFOLD ABSOLUTE PRESSURE SENSOR FAILURE LIMP HOME CALIBRATION.

Calibration table that allows the throttle position sensor to act as a back-up in the

event of a pressure sensor failure, thus ensuring almost normal engine operation. This

is used for limp home in applications where pressure is the primary engine load input.

This table can have up to 8 engine speed calibration sites and 6 throttle position

calibration sites. Calibration range is 20 to 420 KPa in 0.1 Kpa increments.

THROTTLE POSITION SENSOR FAILURE LIMP HOME CALIBRATION

Calibration table that provides a limp-home function if the throttle position sensor is

faulty. This table uses the same engine speed calibration sites as the manifold pressure

failure table limp-home table. Calibration range is 0 to 100% in 0.1 % increments.

EXHAUST BACK PRESSURE SENSOR FAILURE LIMP HOME CALIBRATION

Calibration table that allows the manifold absolute pressure sensor to act as a back up

in the event of this pressure sensor failure, thus ensuring almost normal engine

operation. This is used for limp home in applications where pressure is the primary

engine load input. This table can have up to 8 engine speed calibration sites and 6

manifold absolute pressure sites. Calibration range is 0 to 409 KPa (Gauge) in 1.6 KPa

increments.

TRANSIENT ENGINE OPERATION CALIBRATION

Calibrations to optimize the operation of the engine during acceleration and

deceleration. These calibrations all have common engine speed calibration sites (up to 8

max).

i. IGNITION ADVANCE ATTACK RATE.

Sets the maximum rate at which the ignition timing is

allowed to advance. Can be used to improve driveability

and/or reduce exhaust emissions. Calibration range 1.5 to

400 deg/sec.

ii. IGNITION ADVANCE RETARD RATE.

Sets the maximum rate at which the ignition timing is

allowed to retard. Can be used in conjunction with i. above

to improve driveability and/or reduce exhaust emissions.

Calibration range. 1:5 to 400 deg/sec.

iii. CLOSED THROTTLE ACCELERATION MULTIPLIER. Sets the amount of

additional fuel delivered for increasing throttle openings

starting from a closed throttle condition. Controls the

delivery of fuel for acceleration from small throttle

openings.

iv. OPEN THROTTLE ACCELERATION MULTIPLIER.

Sets the amount of additional fuel delivered for increasing

throttle openings starting from a part throttle condition.

Controls the delivery of fuel for acceleration from large

throttle openings.

v. PART THROTTLE ACCELERATION LIMIT.

Sets the throttle position above which the closed throttle

acceleration multiplier no longer has an effect on

acceleration fuel delivery. This calibration is dependent

upon the relative size of the throttle butterflys to the

engine capacity Calibration range is 0 to 100% of throttle

opening.

vi. ACCELERATION ENRICHMENT DECAY TIME.

Sets the duration of the acceleration enrichment.

Calibration range is 0.08 to 2 SEC.

vii. ACCELERATION ENRICHMENT RECOVERY TIME / DECELERATION

ENLEANMENT DECAY TIME. Sets the time taken for the

acceleration enrichment to recover in readiness for the next

acceleration enrichment. Also controls the duration of

enleanment when a throttle opening reduction occurs.

Calibration range is 0.08 to 2 SEC.

viii.DECELERATION ENLEANMENT MULTIPLIER. '

Sets the amount of fuel delivery reduction immediatly

following any throttle opening reduction.

CHARGE TEMPERATURE ESTIMATION CALIBRATION

Calibration that allows the estimation of the heat transfered to the incoming charge by

the hot manifold and intake port, so that an actual charge temperature may be estimated

for the calculation of correct fuel delivery. This table can have up to 16 engine speed

calibration sites and 10 engine "load" calibration sites. Calibration represent

contribution that coolant temperature has in determining the charge temperature, its

range is 0 to 100% in 0.5% increments. This calibration is particularly useful for 2

stroke engines where the charge temperature is almost totally determined by crankcase

temperature.

WARM-UP ENRICHMENT CALIBRATION

This calibration table allows engine coolant temperature and engine "load" dependent

control of additional fuel delivery. It controls additional fuel delivery after the

initial post start enrichment period has finished, and its main function is to ensure

stable engine operation during engine warmup. It can also be used to enrich the air/fuel

mixture at high engine loads if an engine overheated condition is detected in order to

minimize the risk of engine damage. Calibration may be selected at up to 13 engine

coolant temperature sites and 10 engine "load" sites and the adjustment range is 1.00 to

1.99 times the base fuel delivery.

POST START ENRICHMENT CALIBRATION

Additional fuel delivery immediately after start-up is controlled by this table, this

additional delivery decays away with time to the warm-up enrichment value from the table

above. Calibration range is 1.00 to 3.99 times the base fuel delivery. This calibration

function is only engine coolant temperature dependent and it uses the same engine

coolant temperature calibration sites as chosen for the warm-up enrichment calibration

table above.

POST START ENRICHMENT TIMEOUT CALIBRATION

The decay time for the additional fuel delivery immediately after start-up is controlled

by this table. Calibration range is 0 to 20 SEC. This calibration function is only

engine coolant temperature dependent and it uses the same engine coolant temperature

calibration sites as chosen for the warm up enrichment calibration table above.

WARM-UP ACCELERATION ENRICHMENT MULTIPLIER

Calibration multiplier for additional engine coolant temperature dependent acceleration

enrichment. Calibration range is 1.0 to 8.0 times the "warm" engine value. This

calibration uses the same engine coolant temperature calibration sites as chosen for the

warm-up enrichment calibration table above.

WARM-UP FAST IDLE RPM CALIBRATION

Calibration for idle speed increase required of automatic idle speed control function

during low temperature engine operation. This calibration table may also be used to

increase the idle speed if engine overheating occurs so that engine driven cooling fan

efficiency is improved helping to eleviate the condition. Calibration range is 0 to 1020

RPM. This calibration uses the same engine coolant temperature calibration sites as

chosen for the warm-up enrichment calibration table above.

POST START FAST IDLE RPM CALIBRATION

Calibration for idle speed increase immediately following start-up. Decays away with

time to warm-up fast idle RPM calibration. Calibration range is 0 to 1020 RPM. This

calibration uses the same engine coolant temperature calibration sites as chosen for the

warm up enrichment calibration table above.

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