US 10,883,464 B2 · Method and device for controlling compression ignition engine

Abstract

A system for controlling a compression ignition engine includes: a speed obtaining section which obtains an engine speed; and an injection amount setting section which sets, in a start period after the start of cranking, a fuel injection amount to be injected by injectors in next and subsequent cycles. If an engine speed achieved by combustion in an (n−1)-th cycle is higher than or equal to a determination threshold value and lower than a lower limit of the resonance range, the injection amount setting section sets the fuel injection amount for the n-th cycle to a jump-over injection amount, and sets the fuel injection amount for the (n+1)-th cycle to a resonance induction reducing amount, which is smaller than the jump-over injection amount.

Claims12

Dependent claims

A system for controlling a compression ignition engine having a fuel injection valve which supplies fuel into a combustion chamber, the system comprising:

an engine starter which increases an engine speed to a predetermined idle speed;
a speed obtaining section which detects or estimates the engine speed;
and
an injection amount setting section which sets a fuel injection amount to be injected by the fuel injection valve in next and subsequent cycles, based on the engine speed, in a period until the engine speed reaches the idle speed, wherein
if the engine speed detected or estimated before fuel injection in an n-th cycle is higher than or equal to a predetermined reference speed and lower than a lower limit of a resonance speed range, the lower limit being higher than the reference speed, the injection amount setting section sets a fuel injection amount for the n-th cycle to be a predetermined first injection amount, and sets a fuel injection amount for an (n+1)-th cycle to be a second injection amount smaller than the first injection amount, where n is a positive integer.

2 more elements

A method of controlling a compression ignition engine having a fuel injection valve which supplies fuel into a combustion chamber, the method comprising:

an engine start step in which an engine speed is increased to a predetermined idle speed;
a speed obtaining step in which the engine speed is detected or estimated;
and
an injection amount setting step in which a fuel injection amount to be injected by the fuel injection valve in next and subsequent cycles is set, based on the engine speed, in a period until the engine speed reaches the idle speed, wherein
the injection amount setting step includes, if the engine speed detected or estimated before fuel injection in an n-th cycle is higher than or equal to a predetermined reference speed and lower than a lower limit of a resonance speed range, the lower limit being higher than the reference speed, setting a fuel injection amount for the n-th cycle to be a predetermined first injection amount, and setting a fuel injection amount for an (n+1)-th cycle to be a second injection amount smaller than the first injection amount, where n is a positive integer.

2 more elements

Dependencies are inferred from the claim text.

Method and device for controlling compression ignition engine

Life of this patent

Method and device for controlling compression ignition engine

Life of this patent

Abstract

Claims12