Fuel properties detecting apparatus for an internal combustion e

Details Fuel properties detecting apparatus for an internal combustion e Fuel properties detecting apparatus for an internal combustion e

1988-09-28

1990-03-06

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

731173, G01N 3322, F02D 4104

Patent

active

049056492

ABSTRACT:
A fuel properties detecting aparatus for an internal combustion engine has a pressure detector to detect an inner pressure of cylinder, a crank angle detector to detect a crank angle of engine, and a control device which is adapted to receive signals from the pressure detector and the crank angle detector to thereby calculate an effective calorific value Q of fuel in an ignition cycle on the basis of an inner pressure of a cylinder P(.theta.) at a crank angle in compression and expansion strokes in an ignition cycle, a crank angle .theta. and a cylinder capacity V(.theta.), and to obtain an effective combustion rate K or a low level calorific value Hu of fuel. Fuel properties are detected by using at least one of the effective combustion rate K and the low level calorific value Hu, or a ratio of a fuel injection pulse width Ti to the low level calorific value Hu (Ti/Hu).

REFERENCES:
patent: 4397285 (1983-08-01), O'Neill
patent: 4466408 (1984-08-01), Cheklich
patent: 4788854 (1988-12-01), Javaherian

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