Patent ID: 7188468
Filing Date: 2007-03-13
Classification: F01N,F02D,Y02T

Abstract:
1. A controller for cylinder cut-off for a multi-cylinder internal combustion engine comprising: a partially operable cylinder that is cut off by a cut-off cylinder mechanism provided therewith, a full operating cylinder that is always on during operation of the engine, partially operable cylinder side catalyst temperature estimating section provided along an exhaust passageway connecting to a partially operable cylinder for estimating a temperature of a catalyst on a partially operable cylinder side, full operating cylinder side catalyst temperature estimating section provided along an exhaust passageway connecting to a full operating cylinder for estimating a temperature of a catalyst on a full operating cylinder side, and cylinder cut-off authorization determining section for determining whether to authorize or prohibit a cut-off of the partially operable cylinder based on a partially operable cylinder side catalyst temperature estimated by the partially operable cylinder side catalyst temperature estimating section and a full operating cylinder side catalyst temperature estimated by the full operating cylinder side catalyst temperature estimating section.