Re:GM accused of installing devices in diesel trucks to beat...
by rosbrith on Friday May 26, 2017 @04:03AM
(#14422632)
This replicates the functioning of a carburettor equipped with a mechanical accelerator pump. It squirts some extra fuel into the manifold when the throttle pedal is depressed, the quantity determined by the force applied to the pedal.
Re:GM accused of installing devices in diesel trucks to beat...
by jcoby on Friday May 26, 2017 @08:40AM
(#14423604)
What you're describing is called accelerator enrichment and does mirrror the accel pump in a carb. https://www.hptuners.com/help/vcm_editor_parameters_gm_eng_f...
Power enrichment is a different function and commands a new afr for peak power (generally around 12.5:1) instead of trying to maintain around stoich.
FWIW, that's common on gas engines so there is some precedent. It's called power enrichment and can be adjusted in GM computers. When it kicks in depends on the car/truck it's installed in. But it uses a combination of manifold pressure and throttle position and rpm to decide whether or not to command extra fuel. You can see the params HP Tuners uses to configure the PE circuit here: https://www.hptuners.com/help/vcm_editor_parameters_gm_eng_f...