| 摘要 |
<P>PROBLEM TO BE SOLVED: To properly perform learning correction of a deposit ratio and a residual ratio by using a dual injector system. <P>SOLUTION: From a state of only a cylinder injection of fuel such as a (k-1) cycle, port injection such as a k cycle is performed. Since part of fuel by the port injection adheres on an intake port wall face or the like, an exhaust air-fuel ratio AFRs is changed to a side leaner than a stoichiometric air-fuel ratio. The port deposition ratio Rp is calculated from the change of the exhaust air-fuel ratio AFRs to the leaner side. Then in the (k+1) cycle, if the state is returned to the state of only the cylinder injection of fuel again, the exhaust air-fuel ratio AFRs is changed to a side richer than the stoichiometric air-fuel ratio. The port residual ratio Pp is calculated from the change of the exhaust air-fuel ratio AFRs to the richer side. <P>COPYRIGHT: (C)2007,JPO&INPIT |
