Patent ID: 9708987
Date: 2017-07-18
CPC Classifications: F02D,Y02T

Claim:
1. A control apparatus for application to a compression-ignition engine, the engine having at least one cylinder and a fuel injector controllable for executing injections of fuel into the cylinder, an oxygen concentration variation device operable for varying an oxygen concentration of intake air supplied to the cylinder, and a compression ratio variation device operable for varying a compression ratio of intake air within the cylinder: wherein the control apparatus comprises: density detection circuitry configured for detecting a density of the fuel which is injected by the fuel injector; flammability detection circuitry configured for detecting, as a flammability of the fuel, one of: oxygen concentration increase circuitry configured for controlling the oxygen concentration variation device to increase oxygen concentration of the intake air supplied to the cylinder, when the flammability of the fuel is detected to be less than a predetermined reference value of flammability and the density of the fuel is detected to exceed a predetermined reference value of density, the predetermined reference value of flammability enabling judgement as to whether the flammability of the fuel is normal or not, the predetermined reference value of density enabling judgment as to whether the fuel is closer to a heavy fuel or a light fuel; compression ratio increase circuitry configured for controlling the compression ratio variation device to increase the compression ratio of the intake air within the cylinder, when the flammability of the fuel is detected to be less than the reference value of flammability and the density of the fuel is detected to be less than the reference value of density.