US 10,626,809 B2Granted

Engine device

AssigneeYanmar Co., Ltd.

InventorsKoichi Hirose, Tatsuro Ohsara, Taishi Murakami

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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.

Claims17

Dependent claims

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.

15 more elements

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.

11 more elements

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.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/370,811Filed 6 Dec 2016 · continuation
Priority: JP 2014-1180366 Jun 2014
Published: US 2017/0082041 A123 Mar 2017
Granted: 21 Apr 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification38 codes

F02D 41/0007
Controlling intake air: for control of turbo-charged or super-charged engines
F01N 13/10
Other arrangements or adaptations of exhaust conduits: of exhaust manifolds
F02B 29/0406
Cooling of air intake supply: layout of the intake air cooling or coolant circuit
F02B 37/16
Control of the pumps: by bypassing charging air