Disabled=(Scale not used)
Road speed=(Meter/Pulse or Wheel circumference(meters) divided by
number of pulse per rev)
CLC A/F Ratio
Closed loop control air fuel ratio.
For adaptive correction of air fuel ratio.
Here you enable and configure the CLC (closed loop control). CLC is used to correct air
fuel ratios to maintain Stoichiometric air fuel ratio of 14.7:1 to unsure correct operation of
catalytic converter.
For the CLC to operate correctly the engine must be first tuned within 1 or 2% of
required CLC air fuel ratios.
The CLC has two modes, ECU internal C/L and open loop lean hwy (highway), see
below.
For ECU internal C/L to work you need to have a O2 sensor connected to the SM4 and
configured under I/P ANALOGS – I/P A/F Ratio.
CLC only operates when the engine is no longer in warm up enrichment. The highway
mode is optional, and can be selected in the software set up. Highway mode is achieved
when the ECU logic determines the engine is in highway mode.
The Open Loop air fuel table is used to setup ECU internal C/L and open loop lean hwy
AF ratios.
The CLC will only operate on air fuel ratios Stoichiometric (14.7) or leaner. In internal C/L
it will ignore air fuel ratios leaner than stoichiometric and maintain stoichiometric air fuel
ratio.
Typhical stoichiometric volts for normal 4-wire Bosch O2 sensors are 0,640 Volt.
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