Internal-combustion engines – Engine speed regulator – Responsive to deceleration mode
Reexamination Certificate
1999-11-16
2001-04-17
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Engine speed regulator
Responsive to deceleration mode
C073S114220, C073S116070
Reexamination Certificate
active
06216668
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a method for measuring engine performance, and more particularly, an engine performance measuring method which utilizes the capabilities of an electronically controlled fuel injected engine with compression brake units.
Typically, engine performance has been measured by placing the engine in a test cell and connecting it to a dynamometer. Commercially available internal combustion engines are known which have an electronic control unit which controls fuel injectors and engine compression brake units. When activated, a engine compression brake system converts the engine from a power generating device into a power absorbing device. This power absorbing capability of the engine compression brake may be varied by activating different numbers of compression brake units. Each engine compression brake unit converts one or more cylinders of the engine into power absorbing units. It would be desirable to use the capabilities of engine compression brake units and electronic controls in order to measure engine performance without the need for a dynamometer.
SUMMARY OF THE INVENTION
Accordingly, an object of this invention is to provide a method for measuring engine performance without requiring a dynamometer.
A further object of the invention is to provide such a method which utilizes the capabilities of a fuel injected, compression brake engine which has an electronic control unit which controls fuel injection and compression braking.
These and other objects are achieved by the present invention, wherein an internal combustion engine includes a plurality of cylinders, a plurality of fuel injectors, compression brake units operatively associated the cylinders, an engine speed sensor and an engine control unit (ECU) for controlling the fuel injectors and the compression brake unit as a function of at least sensed engine speed. A method of measuring performance of the engine includes running the engine at a specified speed under no load, setting to zero a rate of fuel flow delivered by a selected one or more of the fuel injectors associated with the cylinders associated with the compression brake unit, increasing by a first amount a rate of fuel flow delivered by the other of the fuel injectors so that the engine runs at the specified engine speed, activating the compression brake unit associated with the selected fuel injectors so that the cylinders associated therewith absorbs power, and again increasing by a second amount a rate of fuel flow delivered by the other of the fuel injectors so that the engine runs at the specified engine speed. This second amount of fuel flow rate increase thereby represents a performance characteristic of the engine.
REFERENCES:
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patent: 5647318 (1997-07-01), Feucht et al.
patent: 5718199 (1998-02-01), Hu et al.
patent: 5733219 (1998-03-01), Rettig et al.
patent: 5816665 (1998-10-01), Burnett et al.
Deere & Company
Gimie Mahmoud
Yuen Henry C.
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