Electromagnetic fuel injector and control method thereof
First Claim
1. An electromagnetic fuel injection valve for injecting fuel by opening/closing a fuel flowing path, including a valve seat, a valve element for opening/closing said fuel flowing path formed between said valve seat and said valve element, and drive means having at least one coil for driving said valve element, wherein said drive means includes first magnetomotive force generating means using said at least one coil and second magnetomotive force generating means, said first magnetomotive force generating means and said second magnetomotive force generating means being composed so that said first magnetomotive force generating means generates and raises its magnetomotive force at a larger rate of change in time in comparison with that of said second magnetomotive force generating means.
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Accused Products
Abstract
An electromagnetic fuel injection valve for injecting fuel by opening/closing a fuel flow path, includes a valve seat, a valve element for opening/closing the fuel flow path formed between the valve seat and the valve element, and a drive unit having at least one coil for driving the valve element. The drive unit includes a first magnetomotive force generating device using the at least one coil and a second magnetomotive force generating device, the first magnetomotive force generating device and the second magnetomotive force generating device being composed so that the first magnetomotive force generating device generates and raises its magnetomotive force at a larger rate of change in time in comparison with the second magnetomotive force generating device. A valve open state is held by the second magnetomotive force generating device which uses a smaller current flow in comparison with the first magnetomotive force generating device.
59 Citations
22 Claims
- 1. An electromagnetic fuel injection valve for injecting fuel by opening/closing a fuel flowing path, including a valve seat, a valve element for opening/closing said fuel flowing path formed between said valve seat and said valve element, and drive means having at least one coil for driving said valve element, wherein said drive means includes first magnetomotive force generating means using said at least one coil and second magnetomotive force generating means, said first magnetomotive force generating means and said second magnetomotive force generating means being composed so that said first magnetomotive force generating means generates and raises its magnetomotive force at a larger rate of change in time in comparison with that of said second magnetomotive force generating means.
- 6. A fuel injection apparatus for injecting fuel by opening/closing a fuel flowing path, which includes an electromagnetic fuel injection valve having a valve seat, a valve element for opening/closing said fuel flowing path formed between said valve seat and said valve element, and drive means having at least one coil for driving said valve element, and control means for operating said electromagnetic fuel injection valve by controlling current flowing in said at least one coil, wherein said drive means includes first magnetomotive force generating means using said at least one coil and second magnetomotive force generating means, said coil and said second magnetomotive force generating means generating a combined magnetomotive force in a direction in which said force generated by said coil and said force generated by said second means strengthen each other at an initial valve opening time at which said valve element is driven from a closed valve state to an valve opening state, said coil raising its magnetomotive force at a larger rate of change in time in comparison with that of said second magnetomotive force generating means, and said current flowing in said coil is stopped during a valve opening hold period for which a valve opening position of said valve element is held by magnetomotive force generated by said second magnetomotive force generating means.
- 11. An internal combustion engine into which fuel is injected by opening/closing a fuel flowing path, which includes a fuel tank, a fuel pump for feeding and pressurizing fuel from said fuel tank, an electromagnetic fuel injection valve for injecting fuel pressurized by said fuel pump, which has a valve seat, a valve element for opening/closing said fuel flowing path formed between said valve seat and said valve element, and drive means having at least one coil for driving said valve element, and control means for determining fuel injection timing and necessary fuel injection amount to be injected from said electromagnetic fuel injection valve and for operating said electromagnetic fuel injection valve by controlling current flowing in said coil, wherein said drive means includes coil first magnetomotive force generating means using said at least one coil and second magnetomotive force generating means, said coil and said second magnetomotive force generating means generating magnetomotive force in the same direction in which said force generated in said coil and said force generated in said second means strengthen each other at an initial valve opening time at which said valve element is driven from a closed valve state to a valve opening state, said coil raising its magnetomotive force at a larger rate of change in time in comparison with that of said second magnetomotive force generating means, and current flowing in said coil is stopped during a valve hold period in which a valve opening position of said valve element is held by magnetomotive force generated by said second magnetomotive force generating means.
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16. A method of injecting fuel by opening/closing a fuel flowing path with a valve element of an electromagnetic fuel injection valve including first magnetomotive force generating means and second magnetomotive force generating means, which valve element is driven by magnetomotive force generated by using said first magnetomotive force generating means and said second magnetomotive force generating means, said fuel flowing path being formed between said driven valve element and a valve seat to which said valve element is seated, said method comprising the steps of:
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generating magnetomotive force with at least one coil provided as said first magnetomotive force generating means and with second magnetomotive force generating means in a force direction in which said force generated with said at least one coil and said force generated with said second means strengthen each other at an initial valve opening time at which said valve element is driven from a closed valve state to a valve opening state, so that said force generated with said at least one coil is raised with a larger rate of change in time in comparison with that generated with said second magnetomotive force generating means; and stopping current flowing in said at least one coil during a valve hold period in which an open position of said valve element is held by said force generated with said second magnetomotive force generating means. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification