Patent ID: 9429090
Filing Date: 2016-08-30
CPC Classification: F01N,F02D,Y02T

Claim Text:
1. A method of estimating temperature of a catalyst associated with a cylinder bank of a multi-displacement internal combustion engine having multiple cylinder banks associated with multiple catalysts, comprising: setting a temperature estimate of the catalysts associated with the multiple cylinder banks substantially equal to a base model temperature; determining deactivation of a cylinder bank of the multiple cylinder banks; identifying a catalyst cooldown correction for the catalyst associated with the deactivated cylinder bank from a catalyst cooldown model including time elapsed since deactivation of the cylinder bank; and applying the catalyst cooldown correction to the temperature estimate of the catalyst associated with the deactivated cylinder bank to update the temperature estimate of the catalyst, wherein determining deactivation of the cylinder bank includes identifying that the cylinder bank has been deactivated while a different cylinder bank is still operating in accordance with multi-displacement operation.