Fuel injection device

Patent metadata

Field	Value
Publication number	US-9528459-B2
Application number	US-201214407659-A
Country	US
Kind code	B2
Filing date	Jun 14, 2012
Priority date	Jun 14, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A fuel injection device is provided with an injection instruction unit that instructs multiple fuel injection valves that inject fuel into respective multiple cylinders of an engine to perform fuel injection while the engine is stopped. The injection instruction unit instructs the multiple fuel injection valves to perform the fuel injection while the engine is stopped on the basis of at least one of an amount of heat from combustion gas with respect to at least one of the multiple fuel injection valves and an amount of heat radiated therefrom. The injection instruction unit refers to an EGR rate before the engine is stopped and reduces the fuel injection while the engine is stopped as the EGR rate is lower.

First claim

The invention claimed is:

1. A fuel injection device provided with an injection instruction unit that instructs multiple fuel injection valves that inject fuel into respective multiple cylinders of an engine to perform fuel injection while the engine is stopped,
the injection instruction unit instructing the multiple fuel injection valves to perform the fuel injection while the engine is stopped on the basis of at least one of an amount of heat from combustion gas by at least one of the multiple fuel injection valves and an amount of heat radiated therefrom,
wherein the injection instruction unit refers to an EGR rate before the engine is stopped and reduces the fuel injection while the engine is stopped as the EGR is lower.

2. The fuel injection device according to claim 1 , wherein the injection instruction unit estimates a tip temperature of the fuel injection valve from the amount of heat received from the combustion gas and the amount of heat radiated, and instructs the multiple fuel injection valves to perform the fuel injection while the engine is stopped on the basis of the tip temperature.

3. The fuel injection device according to claim 2 , wherein the injection instruction unit instructs the multiple fuel injection valves to perform the fuel injection while the engine is stopped on the basis of the tip temperature and the EGR rate.

4. The fuel injection device according to claim 2 , wherein when estimating the tip temperature of each of the multiple fuel injection valves, the injection instruction unit corrects estimated values of the tip temperatures of the fuel injection valves so that estimated values of the tip temperatures of the fuel injection valves that inject fuel into cylinders located at ends of a line in which the multiple cylinders are arranged are lower than those of the tip temperatures of the fuel injection valves that inject fuel into cylinders located closer to a center of the line.

5. The fuel injection device according to claim 1 , wherein the injection instruction unit refers to an in-cylinder gas temperature in one of the cylinders into which the fuel injection valve injects fuel, as a value that represents the amount of heat received from the combustion gas.

6. The fuel injection device according to claim 1 , wherein the injection instruction unit refers to a water temperature as a value that represents the amount of heat radiated.

Assignees

• IKEMOTO Masato
• Toyota Motor Co Ltd

Inventors

• IKEMOTO Masato

Classifications

• F02D41/042 Primary

  for stopping the engine · CPC title

• F02D41/0062

  Estimating, calculating or determining the internal EGR rate, amount or flow · CPC title

• F02M2200/06

  Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles · CPC title

• F02M61/1813

  Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other · CPC title

• F02M2200/05

  Fuel-injection apparatus having means for preventing corrosion · CPC title