Fuel injection control apparatus of internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016017818-A1
Application number	US-201514801492-A
Country	US
Kind code	A1
Filing date	Jul 16, 2015
Priority date	Jul 17, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

A fuel injection control apparatus of an internal combustion engine, which can appropriately control the amount of fuel injection from an in-cylinder injection valve so as to achieve a desired air-fuel ratio, regardless of the operating state of the internal combustion engine, is provided. The fuel injection control apparatus comprises: an additional injection means which, when determining that the operating state of the internal combustion engine is a transient state, allows the in-cylinder injection valve to inject a fuel amount conformed to a changing intake air amount; and a subtraction means for subtracting a minimum fuel amount, injectable from the in-cylinder injection valve, from a fuel amount to be injected, before injection by the additional injection means is performed.

First claim

1 . A fuel injection control apparatus of an internal combustion engine having an in-cylinder injection valve for directly injecting fuel into a combustion chamber, comprising:
operating state detection device that detects an operating state of the internal combustion engine; additional injection device that, when determining based on detection results of the operating state detection device that the operating state of the internal combustion engine is a transient state involving a change in an intake air amount, allows the in-cylinder injection valve to inject a fuel amount conformed to the changing intake air amount; and subtraction device that subtracts a minimum fuel amount, injectable from the in-cylinder injection valve, from a fuel amount to be injected, before injection by the additional injection device is performed.

2 . The fuel injection control apparatus of an internal combustion engine according to claim 1 , wherein
the additional injection device allows the in-cylinder injection valve to inject a fuel amount obtained by adding the minimum fuel amount to the fuel amount conformed to the intake air amount.

3 . The fuel injection control apparatus of an internal combustion engine according to claim 1 , wherein
if a fuel amount obtained by subtracting the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, is less than the minimum fuel amount, the subtraction device takes the fuel amount obtained by subtraction as the minimum fuel amount.

4 . The fuel injection control apparatus of an internal combustion engine according to claim 2 , wherein
if a fuel amount obtained by subtracting the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, is less than the minimum fuel amount, the subtraction device takes the fuel amount obtained by subtraction as the minimum fuel amount.

5 . The fuel injection control apparatus of an internal combustion engine according to claim 3 , wherein
if the subtraction device takes the fuel amount obtained by the subtraction as the minimum fuel amount, the additional injection device allows the in-cylinder injection valve to inject a fuel amount obtained by adding the fuel amount to be injected, before the injection by the additional injection device is performed, to the fuel amount conformed to the intake air amount.

6 . The fuel injection control apparatus of an internal combustion engine according to claim 4 , wherein
if the subtraction device takes the fuel amount obtained by the subtraction as the minimum fuel amount, the additional injection device allows the in-cylinder injection valve to inject a fuel amount obtained by adding the fuel amount to be injected, before the injection by the additional injection device is performed, to the fuel amount conformed to the intake air amount.

7 . The fuel injection control apparatus of an internal combustion engine according to claim 1 , wherein
the additional injection device allows the in-cylinder injection valve to inject fuel in a compression stroke.

8 . The fuel injection control apparatus of an internal combustion engine according to claim 2 , wherein
the additional injection device allows the in-cylinder injection valve to inject fuel in a compression stroke.

9 . The fuel injection control apparatus of an internal combustion engine according to claim 3 , wherein
the additional injection device allows the in-cylinder injection valve to inject fuel in a compression stroke.

10 . The fuel inject ion control apparatus of an internal combustion engine according to claim 4 , wherein
the additional injection device allows the in-cylinder injection valve to inject fuel in a compression stroke.

11 . The fuel injection control apparatus of an internal combustion engine according to claim 5 , wherein
the additional injection device allows the in-cylinder injection valve to inject fuel in a compression stroke.

12 . The fuel injection control apparatus of an internal combustion engine according to claim 6 , wherein
the additional injection device allows the in-cylinder injection valve to inject fuel in a compression stroke.

13 . The fuel injection control apparatus of an internal combustion engine according to claim 1 , wherein
the subtraction device subtracts the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, when the operating state of the internal combustion engine is a gentle acceleration state.

14 . The fuel injection control apparatus of an internal combustion engine according to claim 2 , wherein
the subtraction device subtracts the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, when the operating state of the internal combustion engine is a gentle acceleration state.

15 . The fuel injection control apparatus of an internal combustion engine according to claim 3 , wherein
the subtraction device subtracts the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, when the operating state of the internal combustion engine is a gentle acceleration state.

16 . The fuel injection control apparatus of an internal combustion engine according to claim 4 , wherein
the subtraction device subtracts the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, when the operating state of the internal combustion engine is a gentle acceleration state.

17 . The fuel injection control apparatus of an internal combustion engine according to claim 5 , wherein
the subtraction device subtracts the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, when the operating state of the internal combustion engine is a gentle acceleration state.

18 . The fuel injection control apparatus of an internal combustion engine according to claim 6 , wherein
the subtraction device subtracts the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, when the operating state of the internal combustion engine is a gentle acceleration state.

19 . The fuel injection control apparatus of an internal combustion engine according to claim 7 , wherein
the subtraction device subtracts the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, when the operating state of the internal combustion engine is a gentle acceleration state.

20 . The fuel injection control apparatus of an internal combustion engine according to claim 8 , wherein
the subtraction device subtracts the minimum fuel amount from the fuel amount to be injected, before the injection by the additional injection device is performed, when the operating state of the internal combustion engine is a gentle acceleration state.

Assignees

• Mitsubishi Motors Corp

Inventors

• Miyata Toshiyuki
• Toda Hitoshi

Classifications

• F02D7/00 Primary

  Other fuel-injection control · CPC title

• Y02T10/40

  Engine management systems · CPC title

• F02D41/10

  for acceleration · CPC title

• F02D41/182

  for the control of a fuel injection device · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title