Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1997-11-20
1998-12-01
Solis, Erick R.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4132
Patent
active
058424598
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of controlling a fuel injection apparatus for an internal combustion engine, and particularly to a method of controlling a fuel injection apparatus for an internal combustion engine which prevents the breakage of an exhaust manifold and the like as a result of high-temperatures.
BACKGROUND ART
Conventionally, various kinds of methods of controlling fuel injection apparatuses for internal combustion engines have been proposed. Of these methods, a method of controlling a fuel injection apparatus, by detecting a temperature of the exhaust gas with a temperature sensor, is disclosed in Japanese Patent Application Laid-open No. 3-505115. According to this method, one terminal end of a thermometer extends into an exhaust manifold. A temperature sensor is connected thereto by being embedded in an electronic unit type of a control unit. The control unit converts an extremely weak electric signal from the temperature sensor into a pulse width modulated output signal, and outputs the signal to an electronic fuel injection apparatus. The output signal has a duty cycle, which increases as the temperature of the exhaust gas increases when the increase exceeds a certain level.
The structure described above relates to a control that provides a cooling medium only when there is an actual need for cooling. However, many internal combustion engines, which are used in construction machinery or the like, are often used at full power, and the temperature of the exhaust gas frequently increases. Especially in a location with an atmosphere of high temperature, this tendency becomes more noticeable. The exhaust manifolds of the internal combustion engines used in such a place often break. As a result, the construction machinery is stopped, and the operation is stopped, thereby causing a disadvantage that a great loss occurs due to the delayed completion of the construction or the like.
DISCLOSURE OF THE INVENTION
The present invention is made to eliminate the above-described disadvantages of the conventional art, and its object is to provide an improvement of a method of controlling a fuel injection apparatus for an internal combustion engine that is capable of preventing the breakage of a component exposed to high-temperatures, such as an exhaust manifold, and which gives an alarm in order to keep the operation going.
A method of controlling a fuel injection apparatus for an internal combustion engine relating to the present invention is characterized by including the steps of: which is higher than the first set temperature, combustion engine, 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, and occasions, or when the total of the length of time exceeds a predetermined length, taking at least one of the following actions: giving an alarm, reducing a fuel injection rate, and changing the fuel injection timing.
According to the structure described above, when the number of occasions, at which the temperature of the exhaust gas exceeds the first set temperature, exceeds a predetermined value, or when the total of the lengths of time, during which the temperature of the exhaust gas has exceeded the second set temperature, exceeds a predetermined value, the fuel injection rate is restricted, for example, with an alarm being given; therefore, unexpected breakage of the exhaust manifold or the like, which is caused by high-temperatures of the exhaust gas can be prevented. In addition, after an alarm is given, an operation can be carried out even if the fuel injection rate is restricted; therefore, there is less delay in completion of the construction. The breakage of an exhaust manifold or the like can be also prevented by changing the injection timing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an internal combustion engine related to an embodiment of the present invention;
FIG. 2 is a graph which is related to the embodiment, and whic
REFERENCES:
patent: 4319451 (1982-03-01), Tajima et al.
patent: 5602737 (1997-02-01), Sindano et al.
Abe Norifumi
Akagi Jiro
Okaya Koichi
Sato Hiroki
Komatsu Ltd.
Solis Erick R.
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