Fuel injection control system for an automotive engine
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorMitsuo Nakamura
Life of this patent
Estimating the term…
Abstract
Average pressure of pressure in an intake passage is calculated. A basic injection quantity is determined by engine speed and the average pressure. On the other hand, estimated pressure is estimated from engine speed and throttle position. A correcting coefficient is obtained from the average pressure and the estimated pressure, and the basic injection quantity is corrected with the correcting coefficient.
Claims3
A system for controlling fuel injection of an engine for a motor vehicle having an intake passage, a throttle valve provided in the intake passage, and a fuel injector for injecting fuel by a quantity determined by the system, the system comprising:
- an engine speed sensor producing an engine speed signal dependent on speed of the engine;
- a throttle position sensor producing a throttle position signal dependent on opening degree of the throttle valve;
- a pressure sensor producing a pressure signal dependent on pressure in the intake passage;
- first calculator means for averaging pressures represented by the pressure signal and for producing an average pressure signal;
- estimating means responsive to the engine speed signal and the throttle position signal for estimating pressure in the intake passage and for producing an estimated pressure signal;
- means responsive to the average pressure signal and the estimated pressure signal for producing a correcting signal;
- second calculator means responsive to the engine speed signal and the average pressure signal for producing a basic fuel injection quantity signal;
- and
- corrector means for correcting the basic fuel injection quantity signal with the correcting signal, for determining the quantity of fuel to be injected.
Dependencies are inferred from the claim text.