Engine device

Patent metadata

Field	Value
Publication number	US-10626809-B2
Application number	US-201615370811-A
Country	US
Kind code	B2
Filing date	Dec 6, 2016
Priority date	Jun 6, 2014
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

An engine device includes a main throttle valve disposed at a portion where an outlet of a supercharger and an inlet of an intercooler are coupled to each other, an exhaust bypass flow path configured to couple an outlet of an exhaust manifold to an exhaust outlet of the supercharger, an exhaust bypass valve disposed in the exhaust bypass flow path, an air supply bypass flow path configured to bypass a compressor of the supercharger, and an air supply bypass valve disposed in the air supply bypass flow path. Within a low load range of a load on the engine device, when the load is lower than a predetermined load, feedback control is performed on the main throttle valve, and when the load is higher than the predetermined load, map control based on a data table is performed on the main throttle valve.

First claim

What is claimed is:

1. An engine device comprising:
at least one cylinder;
an intake manifold configured to supply air into the at least one cylinder;
an exhaust manifold configured to discharge exhaust gas from the at least one cylinder;
at least one main fuel injection valve configured to inject liquid fuel into the at least one cylinder;
at least one gas injector configured to mix gas fuel with the air supplied by the intake manifold;
a supercharger comprising a compressor and configured to compress air through a use of the exhaust gas from the exhaust manifold;
an intercooler configured to cool compressed air resulting from the compression by the supercharger and supply resultant cooled air to the intake manifold;
a main throttle valve disposed at a portion where an outlet of the compressor of the supercharger and an inlet of the intercooler are coupled to each other;
an exhaust bypass flow path configured to couple an outlet of the exhaust manifold to an exhaust outlet of the supercharger;
an exhaust bypass valve disposed in the exhaust bypass flow path;
an air supply recirculation flow path configured to couple the outlet of the compressor of the supercharger to an inlet of the compressor of the supercharger, the air supply recirculation flow path including an inlet coupled to the outlet of the compressor of the supercharger and including an outlet coupled to the outlet of the compressor of the supercharger;
an air supply recirculation valve disposed in the air supply recirculation flow path; and
an engine control unit coupled to the main throttle valve; and
wherein, within a low load range of a load on the engine device, the engine control unit is configured to:
based on the load being lower than a predetermined load, perform a feedback control on the main throttle valve, and
based on the load being higher than the predetermined load, perform a map control based on a data table on the main throttle valve.

2. The engine device according to claim 1 , wherein within the low load range, when the load is higher than the predetermined load, the engine control unit is configured to perform the feedback control on the exhaust bypass valve and perform the map control on the air supply recirculation valve.

3. The engine device according to claim 1 , wherein within the low load range, when the load is lower than the predetermined load, the engine control unit is configured to adjust the exhaust bypass valve to fully open and adjust the air supply recirculation valve to be fully closed.

4. The engine device according to claim 1 , wherein within a medium and high load range of the load, the engine control unit is configured to adjust an opening degree of the main throttle valve to fully-open, and control each of the exhaust bypass valve and the air supply recirculation valve to allow pressure inside the intake manifold to be adjusted to a target value based on the load.

5. The engine device according to claim 4 , wherein within the medium and high load range, the engine control unit is configured to perform the feedback control on the exhaust bypass valve, and perform the map control on the air supply recirculation valve.

6. The engine device according to claim 1 , further comprising an intake relay pipe having a first end coupled to the outlet of the supercharger and a second end coupled to the inlet of the intercooler, wherein the intake relay pipe includes the main throttle valve.

7. The engine device according to claim 1 , wherein the engine control unit is configured to provide one or more control signals to the main throttle valve.

8. The engine device according to claim 7 , wherein the one or more control signals are associated with adjustment of an opening degree of the main throttle valve.

9. An engine system comprising:
an intake manifold configured to supply air into at least one cylinder;
an exhaust manifold configured to discharge exhaust gas from the at least one cylinder;
a supercharger comprising a compressor and configured to compress air through a use of the exhaust gas from the exhaust manifold;
an intercooler configured to cool compressed air resulting from the compression by the supercharger and supply resultant cooled air to the intake manifold;
a main throttle valve disposed at a portion where an outlet of the compressor of the supercharger and an inlet of the intercooler are coupled to each other;
an air supply recirculation flow path including:
an inlet coupled to an outlet side of the compressor of the supercharger; and
an outlet coupled to an inlet side of the compressor of the supercharger;

an engine control unit coupled to the main throttle valve;
wherein, within a low load range of a load on the engine system, the engine control unit is configured to adjust an opening degree of the main throttle valve:
responsive to a feedback control when the load is less than a predetermined load; and
responsive to a map control based on a data table when the load is greater than the predetermined load.

10. The engine system of claim 9 , further comprising:
the at least one cylinder;
at least one main fuel injection valve configured to inject liquid fuel into the at least one cylinder; and
at least one gas injector configured to mix gas fuel with the air supplied by the intake manifold.

11. The engine system of claim 9 , further comprising:
an exhaust bypass valve disposed in an exhaust bypass flow path configured to couple an outlet of the exhaust manifold to an exhaust outlet of the supercharger; and
an air supply recirculation valve disposed in the air supply recirculation flow path,
wherein:
the inlet of the air supply recirculation flow path is coupled between the intercooler and the main throttle valve, and
the engine control unit is configured to recirculate a portion of the compressed air discharged from the outlet of the compressor to the inlet of the compressor via the air supply recirculation flow path, the main throttle valve and the air supply recirculation valve.

12. The engine system of claim 9 , wherein the engine control unit is configured to operate the engine system in a diesel mode or a gas mode.

13. An apparatus comprising:
an engine comprising:
an intake manifold configured to supply air into at least one cylinder;
an exhaust manifold configured to discharge exhaust gas from the at least one cylinder;
a supercharger comprising a compressor and configured to compress air through a use of the exhaust gas from the exhaust manifold;
an intercooler configured to cool compressed air resulting from the compression by the supercharger and supply resultant cooled air to the intake manifold;
a main throttle valve disposed at a portion where an outlet of the supercharger and an inlet of the intercooler are coupled to each other; and

an engine control unit coupled to the engine, the engine control unit configured to, within a low load range of a load on the engine:
perform a feedback control on the main throttle valve when a load on the engine is less than a predetermined load; and
perform a map control on the main throttle valve when the load is greater than the predetermined load, the map control based on a data table.

14. The apparatus of claim 13 , further comprising:
an exhaust bypass valve disposed in an exhaust bypass flow path configured to couple an outlet of the exhaust manifold to an exhaust outlet of the supercharger; and
an air supply recirculation valve disposed in an air supply recirculation flow path configured to couple the outlet of the compressor of the supercharger to an inlet of the compressor of the supercharger,
wherein the

Assignees

• Yanmar Co Ltd

Inventors

• Hirose Koichi
• OHSARA Tatsuro
• Murakami Taishi

Classifications

• F02D41/1401

  characterised by the control or regulation method (F02D41/1473, F02D41/1477 take precedence) · CPC title

• F02M35/104

  Intake manifolds · CPC title

• F01N13/10

  of exhaust manifolds {(with cooling jacket F01N3/046)} · CPC title

• F02B37/18

  by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} · CPC title

• F02D2011/102

  at least one throttle being moved only by an electric actuator · CPC title