US 6,546,915 B2Granted

Fuel injection control apparatus

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsKenichi Machida, Tatsuo Hayashi, Masahiko Abe

Life of this patent

Estimating the term…

Loading patent…

Abstract

To enable accurate detection of the alternative ambient pressure when the correction of fuel supply is carried out by the used of the value of the ambient pressure substituted by the negative pressure in the inlet pipe. The difference between the calculated alternative ambient pressure and the estimated ambient pressure (offset) is set as a plurality of functions of the number of engine revolutions and the throttle opening, and stored in the area determination section with a plurality of areas divided by each offset value. In which area the condition of the engine resides is determined from the number of engine revolution and the throttle opening and the offset corresponding to the area is supplied. The calculation section calculates the calculation base value by the use of the negative pressure PB and the offset.

Claims20

Dependent claims

A fuel injection control apparatus for correcting the basic injection time period calculated from the number of engine revolutions and the throttle opening by a correction expression including the value of the ambient pressure to calculate the corrected injection time period, comprising:

first detecting means for detecting a number of engine revolutions;
second detecting means for detecting a throttle opening;
third detecting means for detecting a negative pressure in an inlet pipe;
area determination means for determining the division of the area defined as a function of the number of engine revolutions and the throttle opening in which the engine condition resides out of a plurality of divisions divided based on the offset value that is the difference between the ambient pressure determined under the reference ambient pressure in advance and the negative pressure in the inlet pipe according to the number of engine revolutions and the throttle opening;
calculating means for calculating the base value for calculating the alternative ambient pressure by adding the offset value described above provided for each area determined by the area determination means to the negative pressure in the inlet pipe;
and
ambient pressure value determination means for determining the base value for calculating the alternative ambient pressure as a value of the ambient pressure when the difference between the last determined value of the ambient pressure and the base value for calculating the alternative ambient pressure is not more than the predetermined value.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/951,416Filed 14 Sep 2001
Priority: JP 2000-28050914 Sep 2000
Published: US 2002/0029764 A114 Mar 2002
Granted: 15 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

F02D 41/34
Of the low pressure type: with means for controlling injection timing or duration
F02D 41/182
By measuring intake air flow: for the control of a fuel injection device
F02D 41/32
Controlling fuel injection: of the low pressure type
F02D 2200/0402
Engine intake system parameters: the parameter being determined by using a model of the engine intake or its components