| 摘要 |
According to the present invention, an apparatus and method for controlling injection timing and power balancing in a gaseous fuel engine with an electronic control unit and a shaft encoder is disclosed. The engine includes an engine block having at least one cylinder with an exhaust port and a cylinder head. A fuel injector and a spark plug is seated in the cylinder head and the injector has a valve which separates the fuel in the injector from the cylinder. A piston reciprocates in each cylinder and is attached to a connecting rod. The rod connects each piston to a crankshaft which converts the motion of the piston to rotary motion. The shaft encoder is connected to the crankshaft and monitors the revolutions of the crankshaft. The electronic control unit is coupled to the shaft encoder and to each of the fuel injectors. The method in accordance with the invention includes several steps. First, a working injection time setting the time for each fuel injector to start an injection of fuel into the cylinder is retarded to an initial injection time. Next, the speed of the crankshaft is measured and compared against a first preset limit. The working injection time is advanced at a predetermined rate, if the monitored speed exceeds the first preset limit. When the working injection time is advanced to be equal to or less than a programed function of speed, the working injection time is set to the injection time calculated from the programmed speed function. The method may also involve establishing a working pulse width for each cylinder, measuring an index of the power output in each cylinder, calculating a balancing factor in response to the measured index, and adjusting the working pulse width in response to the balance factor for each cylinder.
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