Fuel injection system

Patent metadata

Field	Value
Publication number	US-9784227-B2
Application number	US-201214416756-A
Country	US
Kind code	B2
Filing date	Jul 25, 2012
Priority date	Jul 25, 2012
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A fuel injection system in the present invention is provided with a fuel injection valve ( 10 ) which incorporates a heater ( 20 ) for heating fuel before being injected. The temperature of the heater ( 20 ) is estimated on the basis of the resistance value R Htr of the heater ( 20 ). The temperature of the heater ( 20 ) estimated at or after the time of occurrence of a point of inflection in the resistance value R Htr of the heater ( 20 ) is corrected in order to reduce to zero the difference between the nucleate boiling start point temperature and the estimated temperature value of the heater ( 20 ) at the time of occurrence of the point of inflection.

First claim

The invention claimed is:

1. A fuel injection system, comprising:
a fuel injection valve configured to inject fuel;
a heater configured to receive a supply of electric power from a predetermined power source and heats fuel before the fuel is injected from the fuel injection valve; and
a processor that is programmed to:
estimate a temperature of the heater on a basis of a resistance value of the heater; and
correct, based on a relationship between a nucleate boiling start point temperature of the fuel and an estimated temperature value of the heater at a time of occurrence of a point of inflection on a time change curve of the resistance value of the heater after energization to the heater is started, the estimated temperature value of the heater to reduce a difference between the nucleate boiling start point temperature and the estimated temperature value at the time of the occurrence of the point of inflection.

2. The fuel injection system according to claim 1 ,
wherein, to reduce the difference, the processor provides a correction to reduce the difference with respect to the temperature of the heater estimated at or after the time of occurrence of the point of inflection.

3. The fuel injection system according to claim 1 ,
wherein the processor corrects the estimated temperature of the heater so as to reduce the difference to zero.

Assignees

• Uchiyama Tomoyuki
• Toyota Motor Co Ltd

Inventors

• Uchiyama Tomoyuki

Classifications

• F02M31/125

  Fuel · CPC title

• F02M53/06 Primary

  with fuel-heating means, e.g. for vaporising · CPC title

• F02M61/04

  having valves {, e.g. having a plurality of valves in series} · CPC title

• F02M53/02 Primary

  with fuel-heating means, e.g. for vaporising · CPC title