Patent ID: 8538664
Filing Date: 2013-09-17
Classification: F02D,Y02T

Abstract:
1. A controller for a diesel engine that performs primary injection control in which primary injection of fuel is controlled based on an operational status of the diesel engine and additional injection control in which additional injection of the fuel is controlled for estimation of a cetane number of the fuel, the diesel engine controller comprising a control section that, as the additional injection control, causes a plurality of fuel injections to be performed at respectively different injection timings, calculates an amount of increase in torque of an engine output shaft due to each of the plurality of fuel injections, estimates injection timing at which misfiring starts to occur based on a trend of variation in the calculated amount of increase in torque as the injection timing of the plurality of fuel injections is shifted in one direction, and estimates the cetane number of the fuel based on the estimated injection timing, wherein the trend of variation in the amount of increase in torque is a trend of variation in the amount of increase in torque as the injection timing is shifted so that the injection timing of the plurality of fuel injections is shifted from an advance side to a retard side relative to a top dead center.