Abstract: Disclosed is a fuel injection control device for an engine equipped with a solenoid-type fuel injector 67. The fuel injection control device comprises: a voltage sensor SW19 configured to detect a voltage of a solenoid of the fuel injector 67; and a PCM 10 configured to set a valve-open period of the fuel injector 67, based on a fuel injection amount according to an operation state of the engine 1, and control the fuel injector 67 based on the valve-open period. The PCM 10 is configured to perform correction for gradually shortening the set valve-open period, as the voltage (residual voltage) detected by the voltage sensor SW19 when opening the fuel injector becomes larger, and control the fuel injector 67 based on the corrected valve-open period.

Abstract: A control system of an engine is provided. The control system includes an exhaust variable valve mechanism for changing an operation mode of an exhaust valve, a fuel injection controlling module for controlling a fuel injector to inject fuel at a fuel injection timing associated with an operating state of the engine, a variable valve mechanism controlling module for operating the exhaust valve via the exhaust variable valve mechanism in a first operation mode when the operating state of the engine is within a compression self-ignition range, and in a second operation mode when the operating state of the engine is within a spark-ignition range, and a first in-cylinder state quantity estimating module for estimating a first state quantity inside the cylinder relating to a burned gas amount within the cylinder.

Abstract: Disclosed is a fuel injection control device for an engine equipped with a solenoid-type fuel injector 67. The fuel injection control device comprises: a voltage sensor SW19 configured to detect a voltage of a solenoid of the fuel injector 67; and a PCM 10 configured to set a valve-open period of the fuel injector 67, based on a fuel injection amount according to an operation state of the engine 1, and control the fuel injector 67 based on the valve-open period. The PCM 10 is configured to perform correction for gradually shortening the set valve-open period, as the voltage (residual voltage) detected by the voltage sensor SW19 when opening the fuel injector becomes larger, and control the fuel injector 67 based on the corrected valve-open period.

Abstract: A control system of an engine is provided. The control system includes an exhaust variable valve mechanism for changing an operation mode of an exhaust valve, a fuel injection controlling module for controlling a fuel injector to inject fuel at a fuel injection timing associated with an operating state of the engine, a variable valve mechanism controlling module for operating the exhaust valve via the exhaust variable valve mechanism in a first operation mode when the operating state of the engine is within a compression self-ignition range, and in a second operation mode when the operating state of the engine is within a spark-ignition range, and a first in-cylinder state quantity estimating module for estimating a first state quantity inside the cylinder relating to a burned gas amount within the cylinder.