US 5,842,459 AGranted

Method of controlling fuel injection apparatus for internal combustion engines

AssigneeKomatsu Ltd.

InventorsJiro Akagi, Hiroki Sato, Koichi Okaya, Norifumi Abe

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Abstract

The present invention is a method of controlling a fuel injection apparatus for an internal combustion engine, and is capable of preventing the breakage of a component which is exposed to high-temperatures, such as an exhaust manifold. To this end, a first set temperature and a second set temperature, higher than the first set temperature, are set in advance, and a temperature of exhaust gas from an internal combustion engine (1) is detected. The number of occasions at which the temperature of the exhaust gas exceeds the first set temperature and the lengths of time during which the temperature of the exhaust gas has exceeded the second set temperature are totaled respectively, and either when the total number of occasions exceeds a predetermined number of occasions or when the total of the lengths of time exceeds a predetermined length, at least one of the following actions are taken: giving an alarm, reducing a fuel injection rate and changing the injection timing.

Claims20

Dependent claims

A method of controlling a fuel injection apparatus for an internal combustion engine, wherein said fuel injection apparatus supplies fuel to said internal combustion engine and said internal combustion engine discharges exhaust gas, said method comprising the steps of:

setting a first set temperature;
setting a second set temperature which is higher than said first set temperature;
detecting a temperature of said exhaust gas;
determining an occasion when, after a thus detected temperature of said exhaust gas has exceeded said first set temperature, said thus detected temperature decreases to less than said first set temperature and then after a first period of time increases to again exceed said first set temperature;
totaling a number of thus determined occasions to provide a total number of occasions;
determining a length of time for which said thus detected temperature exceeds said second set temperature;
and
either when said total number of occasions exceeds a predetermined number of occasions, or when said length of time exceeds a predetermined length, taking at least one of the following actions:
(a) giving an alarm,
(b) reducing an injection rate of fuel to said internal combustion engine, and
(c) changing an injection timing of fuel to said internal combustion engine.

8 more elements

Apparatus for controlling a fuel injection device for an internal combustion engine, wherein said fuel injection device supplies fuel to said internal combustion engine and said internal combustion engine discharges exhaust gas, said apparatus comprising:

a controller having an input for setting a first set temperature and for setting a second set temperature, said second set temperature being higher than said first set temperature;
a temperature sensor for detecting a temperature of said exhaust gas and for applying a signal representative thereof to said controller;
said controller determining an occasion when, after a thus detected temperature of said exhaust gas has exceeded said first set temperature, said thus detected temperature decreases to less than said first set temperature and then after a first period of time increases to again exceed said first set temperature;
said controller totaling a number of thus determined occasions to provide a total number of occasions;
said controller determining a length of time for which said thus detected temperature exceeds said second set temperature;
and
either when said total number of occasions exceeds a predetermined number of occasions, or when said length of time exceeds a predetermined length, said controller taking at least one of the following actions:
(a) giving an alarm,
(b) reducing an injection rate of fuel to said internal combustion engine, and
(c) changing an injection timing of fuel to said internal combustion engine.

7 more elements

Dependencies are inferred from the claim text.