Engine device

Patent metadata

Field	Value
Publication number	US-10267254-B2
Application number	US-201615760591-A
Country	US
Kind code	B2
Filing date	May 24, 2016
Priority date	Sep 16, 2015
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

An engine device of including: an intake manifold configured to supply air into a cylinder; a gas injector configured to mix fuel gas with air supplied from the intake manifold, and supply mixed gas to the cylinder; an igniter configured to ignite, in the cylinder, premixed fuel obtained by pre-mixing the fuel gas with the air; and a control unit configured to execute a combustion control of a premixed fuel based on the output signal indicative of an output from the engine device. When the air amount is determined to be insufficient and when the output signal is lost, the control unit estimates an output signal based on the fuel gas injection amount from the gas injector, and executes the combustion control based on the estimated output signal.

First claim

The invention claimed is:

1. An engine device, comprising:
an intake manifold configured to supply air into a cylinder, a gas injector configured to mix fuel gas with air supplied from the intake manifold, and supply mixed gas to the cylinder, and an igniter configured to ignite, in the cylinder, premixed fuel obtained by pre-mixing the fuel gas with the air, the engine device further comprising:
a control unit configured to execute a combustion control of the premixed fuel based on an output signal indicative of an output from the engine device, wherein
when the output signal is lost, the control unit estimates an output signal based on a fuel gas injection amount from the gas injector, and executes the combustion control based on the estimated output signal.

2. The engine device according to claim 1 , wherein the control unit sets a target value of an intake manifold pressure based on the estimated output signal, and executes the combustion control.

3. The engine device according to claim 1 , wherein the control unit sets a target value of a fuel gas injection amount based on the estimated output signal, and executes the combustion control.

4. The engine device according to claim 1 , wherein, when the output signal is lost, the control unit executes the combustion control based on the estimated signal, until a separate auxiliary engine starts its operation.

5. The engine device according to claim 1 , wherein:
the engine device is a gas engine configured to drive and rotate a generator, and
the control unit receives an output from the generator as the estimated output signal and executes the combustion control.

6. The engine device according to claim 1 , wherein:
the engine device is a dual-fuel engine capable of selecting a gaseous fuel or a liquid fuel, and
the control unit receives an engine torque as the estimated an output signal and executes the combustion control.

Assignees

• Yanmar Co Ltd

Inventors

• Hagiwara Ryoichi
• Yamagishi Osamu
• Ikeda Naoya

Classifications

• F02M21/04

  Gas-air mixing apparatus · CPC title

• F02D41/222 Primary

  relating to the failure of sensors or parameter detection devices · CPC title

• F02B43/04

  for improving efficiency of combustion · CPC title

• F02B69/04

  for gaseous and non-gaseous fuels · CPC title

• F02D2200/1004

  Estimation of the output torque · CPC title