Method for controlling fuel injection for automotive engines
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorHiroshi Ohishi
Life of this patent
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Abstract
A basic fuel injection time is obtained based on engine speed and intake-air pressure in an intake passage of an engine downstream of a throttle valve of the engine. The basic fuel injection time is corrected by a correcting value based on a constant for a fuel injector and capacity of a chamber formed in an intake passage and on variation in intake-air pressure at every one rotation of a crankshaft of the engine when the idling state of the engine or throttle rapid closing are detected.
Claims7
A method for controlling fuel injection for an automotive engine comprising:
- determining constants of an injector for the fuel injection and of a capacity of a chamber formed in an intake passage of the engine;
- detecting engine speed and intake-air pressure in the intake passage downstream of a throttle valve of the engine;
- calculating a basic fuel injection time based on the detected engine speed and intake-air pressure;
- said detecting intake-air pressure includes detecting the intake-air pressure at every one rotation of a crankshaft of said engine;
- calculating the difference between the detected intake-air pressures at every one rotation of the crankshaft;
- correcting the basic fuel injection time by adding thereto a correcting value which is the product of said constants and said difference.
A method for controlling fuel injection for an automotive engine having an intake passage with a throttle valve disposed in the intake passage comprising:
- determining a constant of an injector for the fuel injection;
- detecting engine speed and intake-air pressure in the intake passage downstream of the throttle valve;
- calculating a basic fuel injection time based on the detected engine speed and intake-air pressure;
- said detecting intake-air pressure includes detecting the intake-air pressure at every one rotation of a crankshaft of said engine;
- calculating the difference between the detected intake-air pressures at every one rotation of the crankshaft;
- correcting the basic fuel injection time by adding thereto a correcting value which is the product of said constant and said difference.
An apparatus for controlling fuel injection by a fuel injector having a constant factor of fuel injection time for an automotive engine having an intake passage with a throttle valve disposed in the intake passage comprising:
- means for detecting engine speed and intake-air pressure in the intake passage downstream of the throttle valve;
- means for calculating a basic fuel injection time based on the detected engine speed and intake-air pressure;
- said detecting intake-air pressure includes detecting the intake-air pressure at every one rotation of a crankshaft of said engine;
- means for calculating the difference between the detected intake-air pressures at a rotation of the crankshaft and one rotation of the crankshaft prior thereto;
- means for correcting the basic fuel injection time by adding thereto a correcting value which is the product of said constant and said difference.
Dependencies are inferred from the claim text.