Internal combustion engine

Patent metadata

Field	Value
Publication number	US-9316171-B2
Application number	US-201414244434-A
Country	US
Kind code	B2
Filing date	Apr 3, 2014
Priority date	Apr 12, 2013
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

An internal combustion engine includes fuel injection valves and an ECU. In the internal combustion unit, predetermined injection is performed when the bed temperature of a catalyst is lower that a predetermined temperature. In the predetermined injection, fuel is injected from a first fuel injection valve, from among the fuel injection valves, within the valve opening period of an intake valve, and fuel is injected from a second fuel injection valve, from among the fuel injection valves, within the valve opening period of an exhaust valve. In the internal combustion engine, a first injection amount is specifically injected from the first fuel injection valve in the predetermined injection.

First claim

What is claimed is:

1. An internal combustion engine comprising:
a first injection unit injecting fuel into an intake passage communicating with a combustion chamber;
a second injection unit injecting fuel into the combustion chamber;
an intake valve and an exhaust valve arranged with respect to the combustion chamber; and
a control unit performing a predetermined injection such that when a bed temperature of a catalyst for purifying exhaust gas discharged from the combustion chamber is lower than a predetermined temperature, fuel is injected from the first injection unit, from among the first and second injection units, during a valve opening period of the intake valve, and fuel is injected from the second injection unit, from among the first and second injection units, during a valve opening period of the exhaust valve.

2. The internal combustion engine according to claim 1 , comprising
a piston adjacent to the combustion chamber, and a valve train changing at least a valve closing timing of the exhaust valve, from among valve characteristics of the intake valve and the exhaust valve, wherein
the control unit performs the predetermined injection in a predetermined case and in a case in which the bed temperature of the catalyst is lower than a predetermined temperature, and
the predetermined case is a case in which the valve train is in a state of closing the exhaust valve on an advance side with respect to an exhaust top dead center of the piston and forming a minus overlap between the intake valve and the exhaust valve.

3. The internal combustion engine according to claim 1 , wherein
the control unit sets a fuel amount to be injected by the first injection unit as an injection amount required per cylinder.

4. The internal combustion engine according to claim 1 , wherein
the control unit changes a fuel amount to be injected from the second injection unit, according to the bed temperature of the catalyst.

Assignees

• Katou Yuuichi
• Tomimatsu Makoto
• Toyota Motor Co Ltd

Inventors

• Katou Yuuichi
• Tomimatsu Makoto

Classifications

• F02D41/345

  Controlling injection timing (F02D41/365 takes precedence) · CPC title

• Y02T10/44

  Cross-Sectional Technologies · mapped topic

• F02D41/006

  using internal EGR (control of valve overlap for internal EGR F02D13/0261; arrangements for internal EGR F02M26/01) · CPC title

• F02D13/0265

  Negative valve overlap for temporarily storing residual gas in the cylinder · CPC title

• F02D2200/0804

  Estimation of the temperature of the exhaust gas treatment apparatus · CPC title