Spark ignition direct injection engine, method of operating a spark ignition direct injection engine and computer program product

摘要

A spark ignition direct injection engine, comprising: an engine body (1) having at least one cylinder (18); a fuel injection valve (67) for injecting fuel into the cylinder (18) to form a mixed gas therein; a fuel pressure adjusting mechanism (62) for adjusting a pressure of the fuel to be injected through the fuel injection valve (67); a spark plug (25) arranged to be oriented inside the cylinder (18) and for igniting the gas mixture inside the cylinder (18); and a controller (10) for operating the engine body (1) by controlling at least one of the fuel injection valve (67), the fuel pressure adjusting mechanism (62), and the spark plug (25), wherein Control means (10) a combustion mode between a compression ignition mode, in which the engine body (1) is operated to perform a compression ignition combustion, where the gas mixture itself ignites within the cylinder (18) for combustion, and a spark ignition mode, in which the Engine body (1) is operated to perform a spark ignition combustion, where the spark plug (25) is controlled or controlled to ignite the gas mixture within the cylinder (18) for combustion, immediately after switching from the spark ignition mode to the compression ignition mode the control or control device (10) the engine body (1) transitionally in a In the compression ignition start mode, in which the fuel pressure to be a high fuel pressure of about 30 MPa or more is set by using the fuel pressure adjusting mechanism (62) and the control valve (67) is controlled is to perform the fuel injection at least in a period from a late stage of a compression stroke to an early stage of an expansion stroke, so that the gas mixture ignites within the cylinder (18) for burning, and wherein the controller ( 10), the fuel injection timing after the compression ignition start mode ends to switch to the compression ignition mode.