Fuel injection control device

Patent metadata

Field	Value
Publication number	US-2016305359-A1
Application number	US-201415100359-A
Country	US
Kind code	A1
Filing date	Nov 28, 2014
Priority date	Nov 29, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

In a fuel injection control device, a learning value compensating for a steady deviation between actual air-fuel ratio and target air-fuel ratio is updated through an air-fuel ratio feedback control during engine operation, and a fuel injection amount is corrected using the learning value. If fuel having been replenished is detected at the time of engine starting, a correction amount is added to the learning value. Here, in a case where the learning value is a value which is included in a predetermined range, the correction amount is set to “0” and engine starting is performed by using the learning value as it is. Meanwhile, in a case where the learning value is a value which is not included in the predetermined range, the learning value is corrected to a value equal to a boundary value of the predetermined range by the correction amount, and engine starting is performed.

First claim

1 . A fuel injection control device comprising:
an electronic control unit configured to (a) update and store a learning value compensating for a steady deviation between an actual air-fuel ratio and a target air-fuel ratio through an air-fuel ratio feedback control during operation of an engine, (b) correct a fuel injection amount by using the learning value, (c) detect whether or not fuel is replenished, (d) start fuel injection by using a stored learning value and fuel after being replenished, when the stored learning value at a timing when the electronic control unit determines that fuel is replenished is included in a predetermined range from a first predetermined value to a second predetermined value, the first predetermined value being a value used when an amount increase correction of fuel is performed, the second predetermined value being a value used when an amount decrease correction of fuel is performed, and (e) correct the stored learning value to a value in the predetermined range and start fuel injection by using fuel after being replenished, when the stored learning value at the timing when the electronic control unit determines that fuel is replenished is not included in the predetermined range.

2 . The fuel injection control device according to claim 1 , wherein the first predetermined value is a limit value when the engine operates even in a case where the richest fuel is used, the richest fuel is fuel in which an air-fuel ratio is shifted toward the richest side, and the richest fuel can be replenished.

3 . The fuel injection control device according to claim 2 , wherein the electronic control unit is configured to correct the stored learning value to a value equal to the first predetermined value when the stored learning value at a timing when the electronic control unit determines that fuel is replenished is a value used when the amount increase correction is performed beyond the predetermined range.

4 . The fuel injection control device according to claim 1 , wherein the second predetermined value is a limit value when the engine operates even in a case where the leanest fuel is used, the leanest fuel is fuel in which an air-fuel ratio is shifted toward the leanest side, and the leanest fuel can be replenished.

5 . The fuel injection control device according to claim 4 , wherein the electronic control unit is configured to correct the stored learning value to a value equal to the second predetermined value when the stored learning value at a timing when the electronic control unit determines that fuel is replenished is a value used when the amount decrease correction is performed beyond the predetermined range.

6 . The fuel injection control device according to claim 1 , wherein the electronic control unit is configured to set the predetermined range to be wider as a ratio of a fuel replenishment amount to a fuel storage amount is lower.

7 . A fuel injection control device comprising:
an electronic control unit configured to (a) update and store a learning value compensating for a steady deviation between an actual air-fuel ratio and a target air-fuel ratio through an air-fuel ratio feedback control during operation of an engine, (b) correct a fuel injection amount by using the learning value, (c) detect whether or not fuel is replenished, (d) start fuel injection using fuel after being replenished and a fuel injection amount corrected based on a stored learning value when the stored learning value at a timing when the electronic control unit determines that fuel is replenished is included in a predetermined range from a first predetermined value to a second predetermined value, the first predetermined value being a value used when an amount increase correction of fuel is performed, the second predetermined value being a value used when an amount decrease correction of fuel is performed, and (e) start fuel injection using fuel after being replenished and a fuel injection amount in a predetermined injection amount range when the stored learning value at a timing when the electronic control unit determines that fuel is replenished is not included in the predetermined range, the predetermined injection amount range being a range of a fuel injection amount corrected by the learning value in the predetermined range.

Assignees

• Toyota Motor Co Ltd
• Aisan Ind

Inventors

• Komoda Takao
• Takekawa Shoichiro

Classifications

• F02D41/062

  for starting (F02D41/061 takes precedence) · CPC title

• F02D41/0027

  the fuel being gaseous (non-electrical control F02D19/02) · CPC title

• F02D19/029

  Determining density, viscosity, concentration or composition · CPC title

• F02D41/2454 Primary

  Learning of the air-fuel ratio control · CPC title

• F02M21/0215

  Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas · CPC title