Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2000-05-26
2001-11-27
Solis, Erick (Department: 3681)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S326000, C477S173000
Reexamination Certificate
active
06321722
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and apparatus for controlling an amount of fuel to be injected into a diesel engine, and more particularly to a method and apparatus that can reduce shock upon clutch engagement while an engine brake is applying.
2. Description of the Related Art
Conventionally, a basic amount of fuel injection in a diesel engine is determined based on an engine revolution speed and an accelerator opening, and this basic value is modified based on temperature of water flowing in the engine and/or intake air temperature in order to determine an ultimate (or target) amount of fuel injection.
Incidentally, when a driver is operating a vehicle equipped with a manual transmission, he/she may perform a shift-down operation to the transmission (gear shift-down) while an engine brake is being applying. In this situation, the engine revolution speed often rises steeply upon engagement of a clutch. This results in great change in engine revolution speed. This is primarily caused by negative acceleration due to the engine brake and inertia of the vehicle. As the clutch is engaged, the load on the vehicle is first shifted forward and then shifted backward because of reaction. In other words, back-and-forth oscillation occurs. This results in very fast change in the engine revolution speed, as mentioned earlier. As the engine revolution speed varies rapidly, passengers in the vehicle are forced to move back and forth and experience great uncomfortableness.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome the above described problems.
According to one aspect of the present invention, there is provided an arrangement for controlling fuel injection in a diesel engine, including a sensor for detecting if an engine revolution speed change per unit time exceeds a predetermined amount, another sensor for detecting if an accelerator opening stays within a predetermined range, and a controller for determining a target amount of fuel injection that is greater than a basic amount of fuel injection when the engine revolution speed change exceeds the predetermined amount and the accelerator opening stays in the predetermined range. The basic amount of fuel injection is determined at least based on the accelerator opening and engine revolution speed.
The engine revolution speed change sensor may determine whether the engine revolution speed variation exceeds the predetermined value by comparing a filtered value of engine revolution speed change rate with a threshold value that changes with the engine revolution speed.
The controller may determine the target amount of fuel injection based on at least one of the engine revolution speed and the temperature of water flowing in the engine.
Additional objects and advantages of the present invention will become apparent to those skilled in the art to which the invention relates from the subsequent detailed description and appended claims, taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4515040 (1985-05-01), Takeuchi et al.
patent: 6006724 (1999-12-01), Takahashi et al.
Isuzu Motor Limited
McCormick Paulding & Huber LLP
Solis Erick
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