Fuel injection valve controller apparatus
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorSusumu Maeda
Life of this patent
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Abstract
A second operation mode without a hold period is used for starting up an engine when the ambient temperature is extremely low so that an electromagnetic coil remains fed with the current until the valve opening is completed, thus ensuring elimination of an injection valve cling up. A full opening of the injection valve is recognized by detecting a decrease of a coil current in the electromagnetic coil. The lower the temperature where the cling up is hardly eliminated in a short period, the longer the energizing period for the coil is provided. Consequently, such an event as failing to eliminate the cling up due to too short of the energizing period will be prevented.
Claims8
A fuel injection valve controller apparatus for driving a fuel injection valve for a gaseous fuel internal combustion engine which is opened by feeding an electromagnetic coil with a current, comprising:
- temperature detecting means for detecting the temperature representative of an engine temperature;
- valve opening signal generating means for producing a valve opening signal which defines a period for opening the fuel injection valve;
- driver controlling means adapted to be operable in one of a first operation mode having a hold period for holding the full opening of the fuel injection valve and a second operation mode not having the hold period and the driver controlling means being arranged in the first operation mode for decreasing the coil current after the fuel injection valve has fully been opened with a high intensity of the coil current fed to the electromagnetic coil in response to the valve opening signal and during the valve opening signal is enabled and
- switching means for, when the detected engine temperature is lower than a predetermined temperature, switching the driver controlling means to the second operation mode for at least first cycle of the valve opening operation after turning on of an ignition switch for starting up the engine,
- wherein the coil current in the second operation mode is shut off when it is detected that the fuel injection valve has fully been opened in response to the valve opening signal, regardless of the valve opening signal being enabled continuously.
Dependencies are inferred from the claim text.