Aftertreatment system for work vehicle engine system and engine system using same

Abstract

A control system for a work vehicle engine system with an engine from which exhaust gas flows, at least in part, to an aftertreatment selective catalytic reduction (SCR) catalyst includes a temperature sensor providing an indication of a catalyst temperature associated with the SCR catalyst and a controller having processing and memory architecture. The controller is configured to receive a control signal from the temperature sensor indicative of the catalyst temperature and execute instructions according to the control signal to activate a conversion of exhaust gas by the SCR catalyst by operating the engine system in a first mode that drives the SCR catalyst temperature to a first temperature threshold. After first temperature threshold is reached, the controller is configured to execute instructions to reduce power to the SCR catalyst by operating the engine system in a second mode in which the conversion of the exhaust gas by the SCR catalyst is sustained by hysteresis within a temperature band between the first temperature threshold and a second temperature threshold that is less than the first temperature threshold.

Dependencies are inferred from the claim text.