| 摘要 |
Control apparatus and method for internal combustion engine includes a fuel injection valve that injects fuel into an intake pipe at the upstream side of intake valves. When a deposition amount VDEPO of the intake valves is estimated, and becomes greater than a second threshold value SL2, the current mode switches to a cleaning mode to clean deposits away by increasing the amount of fuel adhering to the intake valves and changing the fuel injected by the fuel injection valve to a fuel with a higher cleaning performance, or one of increasing and changing. The increasing of the amount of fuel adhering to the intake valves is achieved by the changing of the injecting timing, the increasing of the fuel pressure, the switching of the fuel injection valve, and the like. Furthermore, changing of the fuel with the higher cleaning performance is achieved by switching to additive-containing fuel.
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