Abstract: A spark plug includes a ground electrode, an insulator, and a center electrode. In a case where a first position of a surface of the ground electrode exposed to a side of an inner wall surface of a cylinder head is a most downstream position in an air flow direction between the center electrode and the ground electrode, and a second position of the inner wall surface of the cylinder head is a position closest to the center electrode on a downstream side of the center electrode in an air flow direction, the spark plug is installed at a position where the first position and the second position are on a same air flow line, or at a position where the first position is recessed to a side where the first position recedes from the inner wall surface than the second position.

Abstract: A spark plug includes a ground electrode, an insulator, and a center electrode. In a case where a first position of a surface of the ground electrode exposed to a side of an inner wall surface of a cylinder head is a most downstream position in an air flow direction between the center electrode and the ground electrode, and a second position of the inner wall surface of the cylinder head is a position closest to the center electrode on a downstream side of the center electrode in an air flow direction, the spark plug is installed at a position where the first position and the second position are on a same air flow line, or at a position where the first position is recessed to a side where the first position recedes from the inner wall surface than the second position.

Abstract: The control device controls an internal combustion engine comprising a fuel injector 31. The control device comprises an injection control part controlling fuel injection from the fuel injector. The injection control part controls the fuel injections so as to perform a plurality of pre-injections and a main injection and so that the pre-injected fuel is burned by compression self-ignition after the start of main injection. The injection control part controls the fuel injector so as to perform the pre-injections and main injection at basic injection timings during steady operation, and performs correction control so as to correct the injection timings from the basic injection timings during transient operation. In correction control, the larger a crank angle from TDC of the injection timings of the different injections before correction, the greater the amounts of correction of the injection timings of the injections.

Abstract: A controller is provided that performs first injection that executes fuel injection with lower injection rate and subsequently performs second injection with higher injection rate. The controller configured to determine a target value for fuel pressure drop amount or difference between pressure of fuel within a fuel injection valve at starting point of the first injection and pressure of fuel within the fuel injection valve while the first injection is performed, and stop supply of command signal to the fuel injection valve once fuel pressure drop amount in the first injection becomes greater than target value for the fuel pressure drop amount, and supply command signal once the fuel pressure drop amount in the first injection becomes smaller than the target value for the fuel pressure drop amount.

Abstract: The control device controls an internal combustion engine comprising a fuel injector 31. The control device comprises an injection control part controlling fuel injection from the fuel injector. The injection control part controls the fuel injections so as to perform a plurality of pre-injections and a main injection and so that the pre-injected fuel is burned by compression self-ignition after the start of main injection. The injection control part controls the fuel injector so as to perform the pre-injections and main injection at basic injection timings during steady operation, and performs correction control so as to correct the injection timings from the basic injection timings during transient operation. In correction control, the larger a crank angle from TDC of the injection timings of the different injections before correction, the greater the amounts of correction of the injection timings of the injections.

Abstract: A controller is provided that performs first injection that executes fuel injection with lower injection rate and subsequently performs second injection with higher injection rate. The controller configured to determine a target value for fuel pressure drop amount or difference between pressure of fuel within a fuel injection valve at starting point of the first injection and pressure of fuel within the fuel injection valve while the first injection is performed, and stop supply of command signal to the fuel injection valve once fuel pressure drop amount in the first injection becomes greater than target value for the fuel pressure drop amount, and supply command signal once the fuel pressure drop amount in the first injection becomes smaller than the target value for the fuel pressure drop amount.