Control device for internal combustion engines

Abstract

The challenge is to suppress the accumulation of deposits in the intake ports and intake valves while preventing deterioration of NVH performance. [Solution] The control device is a control device for an internal combustion engine comprising a port injection valve that injects fuel into the intake port and an in-cylinder injection valve that injects fuel into the cylinder, wherein the control device performs fuel injection using the port injection valve when the vehicle equipped with the internal combustion engine is running and the internal combustion engine is in an idling state (first state), or when the vehicle's stationary duration is less than a preset threshold and the internal combustion engine is in an idling state (second state), and performs fuel injection using only the in-cylinder injection valve when the vehicle is in an idling state other than the first and second states.

Claims

1. A control device for an internal combustion engine, comprising a port injection valve for injecting fuel into an intake port and an in-cylinder injection valve for injecting fuel into a cylinder, The control device performs fuel injection using the port injection valve when the vehicle equipped with the internal combustion engine is in motion and the internal combustion engine is idling (first state), or when the vehicle's stationary duration is less than a preset threshold and the internal combustion engine is idling (second state), and performs fuel injection using only the in-cylinder injection valve when the vehicle is idling in any state other than the first or second state. Control device for internal combustion engines.

2. When the control device determines whether or not the second state is in place, the threshold includes a first threshold and a second threshold that is lower than the first threshold. The control device selects the first threshold if there is no history of fuel injection using only the in-cylinder injection valve during a single trip from the start to the stop of the internal combustion engine, and selects the second threshold if there is such a history. A control device for an internal combustion engine according to claim 1.

Images