Fuel supply control system for internal combustion engine with i

Details Fuel supply control system for internal combustion engine with i Fuel supply control system for internal combustion engine with i

1988-09-21

1990-07-17

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123480, 123489, F02D 4132

Patent

active

049414488

ABSTRACT:
A fuel supply control system derives a basic induction volume efficiency on the basis of an intake air pressure and modifies the basic induction volume efficiency with a correction value which is derived on the basis of an engine revolution speed and the intake air pressure. An induction volume efficiency is derived on the basis of modified basic induction volume efficiency, which derived induction volume efficiency is used for deriving a basic fuel supply amount with the intake air pressure. The basic fuel supply amount thus derived is used for controlling fuel supply for the engine. Derivation of the basic induction volume efficiency is performed by an interrupt routine which may be executed in a predetermined timing derived depending upon a time or in synchronism with engine revolution cycle. The correction value may be derived in a background job. Since the variation range of the corrective value is relatively small versus variation of the basic induction volume efficiency, smaller capacity of memory is required even when the correction value is set in a form of a two-dimensional table. With this, the memory capacity required for setting the two-dimensional map can be small but can provide satisfactorily high precision in controlling air/fuel ratio.

REFERENCES:
patent: 4112879 (1978-09-01), Assenheimer et al.
patent: 4404946 (1983-09-01), Hoard et al.
patent: 4671242 (1987-06-01), Akiyama et al.

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