Injection controller and injection control method

Patent metadata

Field	Value
Publication number	US-12140103-B1
Application number	US-202318475426-A
Country	US
Kind code	B1
Filing date	Sep 27, 2023
Priority date	Sep 27, 2023
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

An injection controller includes processor that determines a fuel injection quantity in each of cylinders of a multi-cylinder engine, and a memory. The processor acquires an intake air pressure of each of the cylinders, determines, for each of the cylinders, on the basis of the intake air pressure in one intake stroke, a fuel injection quantity for a next intake stroke in the cylinder, determines whether an instruction operation for making an instruction to increase or reduce a rotation speed of the engine has been performed on the basis of the intake air pressure in one of the cylinders, and performs transient response control to apply the fuel injection quantity for the next intake stroke in the one cylinder also to the fuel injection quantity in the next intake stroke in the cylinders other than the one cylinder when it is determined that the instruction operation has been performed.

First claim

What is claimed is:

1. An injection controller that controls fuel injection in each cylinder of an engine including a plurality of cylinders, the injection controller comprising:
a processor that determines a fuel injection quantity in each of the cylinders; and
a memory, wherein
the processor
acquires an intake air pressure of each of the cylinders from an intake air pressure sensor provided in an intake path,
determines, for each of the cylinders, on the basis of the intake air pressure in one intake stroke, a fuel injection quantity for a next intake stroke in the cylinder,
determines whether an instruction operation for making an instruction to increase or reduce a rotation speed of the engine has been performed on the basis of the intake air pressure in one of the cylinders, and
performs transient response control to apply the fuel injection quantity for the next intake stroke in the one cylinder also to the fuel injection quantity in the next intake stroke in the cylinders other than the one cylinder when it is determined that the instruction operation has been performed.

2. The injection controller according to claim 1 , wherein the processor determines that the instruction operation has been performed on the basis of the intake air pressure of the one cylinder and the intake air pressure of another one of the cylinders that starts the intake stroke immediately before the intake stroke of the one cylinder.

3. The injection controller according to claim 1 , wherein
the processor
acquires the rotation speed of the engine from a rotation sensor that detects the rotation speed of the engine, and
determines whether the instruction operation has been performed on condition that the rotation speed of the engine is less than a predetermined upper limit rotation speed threshold and the intake air pressure in the one cylinder is less than a predetermined upper limit pressure threshold.

4. The injection controller according to claim 1 , wherein
the processor
acquires the rotation speed of the engine from a rotation sensor that detects the rotation speed of the engine, and
does not perform the transient response control when the rotation speed of the engine is equal to or less than a predetermined lower limit rotation speed threshold or the intake air pressure in the one cylinder is equal to or less than a predetermined lower limit pressure threshold.

5. The injection controller according to claim 1 , wherein
the intake air pressure sensor detects an intake air pressure inside an intake manifold that distributes, to the cylinders, air flowing into the intake manifold from an intake pipe through an intake valve, and
the processor acquires, for each of the cylinders, an intake air pressure detected by the intake air pressure sensor at a timing when a piston of the cylinder reaches a top dead center position in the intake stroke of the cylinder as the intake air pressure in the cylinder.

6. The injection controller according to claim 1 , wherein explosion intervals between a plurality of the cylinders are irregular intervals in the engine.

7. The injection controller according to claim 6 , wherein
the processor
determines that the instruction operation has been performed when an intake air pressure variation exceeds a predetermined variation threshold, wherein the intake air pressure variation is an absolute value of a difference between the intake air pressure of the one cylinder and the intake air pressure of another one of the cylinders that starts the intake stroke immediately before the intake stroke of the one cylinder, and
the predetermined variation threshold being used to determine presence or absence of the instruction operation, has different values corresponding to a difference in crank angle at a top dead center in the intake stroke between two of the cylinders in which the intake air pressure used to calculate the intake air pressure variation is measured.

8. The injection controller according to claim 1 , wherein the engine is an engine for an outboard motor.

9. An injection control method performed by a processor that controls a fuel injection quantity in each cylinder of an engine including a plurality of cylinders, the injection control method comprising:
an acquiring step of acquiring an intake air pressure of each of the cylinders from an intake air pressure sensor provided in an intake path;
an injection quantity determining step of determining, for each of the cylinders, on the basis of the intake air pressure in one intake stroke, a fuel injection quantity in a next intake stroke in the cylinder;
an instruction determining step of determining that an instruction operation for making an instruction to increase or reduce a rotation speed of the engine has been performed on the basis of the intake air pressure in one of the cylinders; and
a transient response step of performing transient response control to apply the fuel injection quantity for the next intake stroke in the one cylinder determined in the injection quantity determining step also to the fuel injection quantity in the next intake stroke in the cylinders other than the one cylinder when it is determined that the instruction operation has been performed in the instruction determining step.

Assignees

• Honda Motor Co Ltd

Inventors

• Miyauchi Tomohiro
• Asai Kenichiro

Classifications

• F02D41/32

  of the low pressure type {(F02D41/3082 takes precedence)} · CPC title

• F02D41/2422

  Selective use of one or more tables · CPC title

• F02D2250/12

  Timing of calculation, i.e. specific timing aspects when calculation or updating of engine parameter is performed · CPC title

• F02D2200/101

  Engine speed · CPC title

• F02D2200/0406

  Intake manifold pressure · CPC title