Patent ID: 6491033
Filing Date: 2002-12-10
Classification: F02B,F02D

Abstract:
An internal combustion engine having an engine body defining at least one combustion chamber, a throttle valve affecting a flow of air into the at least one combustion chamber, a charge former configured to deliver fuel to the engine body to form an air/fuel mixture within the combustion chamber for combustion therein, a combustion condition sensor communicating with the combustion chamber, the combustion condition sensor configured to output a signal indicative of a combustion condition in the combustion chamber, and a controller communicating with the combustion condition sensor and configured to control operation of the charge former, the controller including a memory having a three-dimensional map stored therein, the three-dimensional map including data regarding a target output value of the combustion condition sensor as a function of a first and a second engine operation condition, the controller being configured to adjust an air fuel ratio of the fuel and air delivered to the engine such that a value of the output signal of the combustion condition sensor is approximately the target output value, wherein a first engine operation state comprises engine speeds less than about 3500 rpm and throttle valve positions between approximately closed and about one-half open.