Control device of internal combustion engine

Patent metadata

Field	Value
Publication number	US-9239022-B2
Application number	US-201113580932-A
Country	US
Kind code	B2
Filing date	Feb 14, 2011
Priority date	Feb 23, 2010
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

Disclosed is an internal-combustion engine controller capable of improving emission characteristics at a start of an internal-combustion engine. When injection during an exhaust stroke is controlled in a port-injection engine, the engine controller ECU performs the first fuel injection during t 1 to t 2 according to a memory-based crank angle as illustrated in FIG. 12 ( b ) at a fuel injection timing before determination of an actual stroke. Thus, the injected fuel has been introduced into a cylinder during the actual stroke. If fuel is not injected during t 1N to t 3N within the next exhaust stroke as denoted by the solid line, this causes misfire in the cylinder, so that the engine rotation at the start cannot be smooth. Thus, the ECU clears a finished fuel injection flag (F_INJ) at an incorrect crank angle storage determination timing (t JUD ) as denoted by the dashed-dotted line, thereby capable of controlling the fuel injection.

First claim

The invention claimed is:

1. An internal-combustion engine controller for an internal-combustion engine including cylinders, a crank sensor, and a top dead center (TDC) sensor, the internal-combustion engine controller comprising:
a cylinder-determining information storing unit that stores as cylinder-determining information an actual crank angle of each cylinder at a time of stopping the internal-combustion engine;
an actual stroke-determining unit that:
reads a signal from the crank sensor and a signal from the TDC sensor,
estimates a current crank angle of each cylinder based on the actual crank angle at the time of stopping the internal-combustion engine stored in the cylinder-determining information storing unit and the signal read from the crank sensor,
determines, based on the signals read from the crank sensor and the TDC sensor, a current actual crank angle of each cylinder and thereby determines a current actual stroke of each cylinder, and
calculates a difference between the estimated crank angle and the determined actual crank angle;

a fuel injection-controlling unit that:
performs an initial fuel injection toward a predetermined cylinder at a timing based on the estimated crank angle of the predetermined cylinder, the initial fuel injection being a fuel injection performed first toward the predetermined cylinder during a time of starting the internal-combustion engine and before the determination of the actual stroke,
calculates a crank angle advance from the timing of the initial fuel injection toward the predetermined cylinder to a timing of the determination of the actual stroke by the actual stroke-determining unit, and
injects, after the determination of the actual stroke by the actual stroke-determining unit, an amount of fuel injection corresponding to a driving condition at a fuel injection timing corresponding to the actual stroke to start the internal-combustion engine; and

an injection timing-determining unit that:
calculates, based on the estimated crank angle at the timing of the initial fuel injection toward the predetermined cylinder and the difference calculated by the actual stroke-determining unit, an actual crank angle at the timing of the initial fuel injection toward the predetermined cylinder,
calculates, based on the calculated actual crank angle and the crank angle advance from the timing of the initial fuel injection toward the predetermined cylinder to the timing of the determination of the actual stroke, the crank angle advance being calculated by the fuel injection-controlling unit, an angle to determine whether to inject fuel for the predetermined cylinder at a next cycle, and
determines, by comparing the calculated angle to determine whether to inject fuel for the predetermined cylinder at the next cycle with a predetermined angle, whether or not fuel injected in the initial fuel injection toward the predetermined cylinder and fuel to be injected toward the predetermined cylinder at a first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder by the actual stroke-determining unit are combined at the same combustion timing, the fuel injection toward the predetermined cylinder at the first-coming fuel injection timing being a fuel injection to be performed first after the determination of the actual stroke of the predetermined cylinder,

wherein the fuel injection-controlling unit controls, based on a result of the determination by the injection timing-determining unit, a fuel injection at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder.

2. The internal-combustion engine controller according to claim 1 ,
wherein when the injection timing-determining unit determines that the fuel injected in the initial fuel injection toward the predetermined cylinder and the fuel to be injected at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder are not combined at the same combustion timing, the fuel injection-controlling unit controls a fuel injection at the amount of fuel injection corresponding to the driving condition at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder; and
wherein when the injection timing-determining unit determines that the fuel injected in the initial fuel injection toward the predetermined cylinder and the fuel to be injected at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder are combined at the same combustion timing, the fuel injection-controlling unit does not perform a fuel injection at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder.

3. The internal-combustion engine controller according to claim 1 ,
wherein the internal-combustion engine is a port-injection internal-combustion engine whose fuel injection valve is disposed in an intake passage; and
the injection timing-determining unit determines whether or not the fuel injected in the initial fuel injection toward the predetermined cylinder and the fuel to be injected at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder are combined at the same combustion timing, by determining whether or not a stroke at the determination of the actual stroke of the predetermined cylinder is before bottom dead center during an intake stroke.

4. The internal-combustion engine controller according to claim 2 ,
wherein the internal-combustion engine is a port-injection internal-combustion engine whose fuel injection valve is disposed in an intake passage; and
the injection timing-determining unit determines whether or not the fuel injected in the initial fuel injection toward the predetermined cylinder and the fuel to be injected at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder are combined at the same combustion timing, by determining whether or not a stroke at the determination of the actual stroke of the predetermined cylinder is before bottom dead center during an intake stroke.

5. The internal-combustion engine controller according to claim 1 ,
wherein the internal-combustion engine is a direct-injection internal-combustion engine whose fuel injection valve is disposed toward a combustion chamber; and
the injection timing-determining unit determines whether or not the fuel injected in the initial fuel injection toward the predetermined cylinder and the fuel to be injected at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder are combined at the same combustion timing, by determining whether or not a stroke at the determination of the actual stroke of the predetermined cylinder is before top dead center during an exhaust stroke.

6. The internal-combustion engine controller according to claim 2 ,
wherein the internal-combustion engine is a direct-injection internal-combustion engine whose fuel injection valve is disposed toward a combustion chamber; and
the injection timing-determining unit determines whether or not the fuel injected in the initial fuel injection toward the predetermined cylinder and the fuel to be injected at the first-coming fuel injection timing after the determination of the actual stroke of the predetermined cylinder are combined at the same combustion timing, by determining whether or not a stroke at the determination of the actual stroke of the predetermined cylinder is before top dead center during an exhaust stroke.

7. The internal-combustion engine controller according to cla

Assignees

• Tsuji Kanta
• Mitsui Atsushi
• Hara Fumio
• Honda Motor Co Ltd

Inventors

• Tsuji Kanta
• Mitsui Atsushi
• Hara Fumio

Classifications

• F02D41/009

  using means for generating position or synchronisation signals · CPC title

• F02D2041/0092

  Synchronisation of the cylinders at engine start · CPC title

• F02D29/02 Primary

  peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers · CPC title

• F02D41/062

  for starting (F02D41/061 takes precedence) · CPC title

• F02N11/0814

  comprising means for controlling automatic idle-start-stop · CPC title