Exhaust gas aftertreatment system

An aftertreatment system comprising:

• an intake chamber;
• an intake chamber dosing module coupled to the intake chamber and configured to provide an upstream treatment fluid to exhaust gas within the intake chamber;
• a decomposition chamber positioned downstream of the intake chamber;
• a decomposition chamber dosing module coupled to the decomposition chamber and configured to provide a downstream treatment fluid to exhaust gas within the decomposition chamber;
• a downstream particulate filter positioned downstream of the decomposition chamber dosing module;
• a first sensor positioned downstream of the downstream particulate filter and configured to provide a first signal;
• and
• an aftertreatment system controller communicable with the first sensor, the intake chamber dosing module, and the decomposition chamber dosing module, the aftertreatment system controller configured to:
• cause the intake chamber dosing module to provide a first amount of the upstream treatment fluid into the intake chamber,
• cause the decomposition chamber dosing module to provide a second amount of the downstream treatment fluid into the decomposition chamber,
• receive the first signal from the first sensor,
• determine a first measurement based on the first signal,
• determine that the first measurement is greater than a first threshold,
• cause the intake chamber dosing module to provide a third amount of the upstream treatment fluid into the intake chamber after determining that the first measurement is greater than the first threshold, the third amount being greater than the first amount, and
• cause the decomposition chamber dosing module to provide a fourth amount of the downstream treatment fluid into the decomposition chamber after determining that the first measurement is greater than the first threshold, the fourth amount being less than the second amount and less than the third amount.