Air/fuel ratio controller for large internal combustion engines

Details Air/fuel ratio controller for large internal combustion engines Air/fuel ratio controller for large internal combustion engines

F - Mech Eng,Light,Heat,Weapons

02

D

F02D 19/02 (2006.01) F02D 41/14 (2006.01) F02M 7/12 (2006.01) F02M 21/02 (2006.01)

Patent

CA 2134583

Apparatus, and a corresponding method for its operation, for controlling the air/fuel ratio in a large engine having one or more banks of cylinders with separate intake and exhaust manifolds. Oxygen sensors in the manifolds are sampled periodically to provide the apparatus with an indication of the level of oxygen, and therefore an indication of the level of various pollutants, in exhaust gases dis- charged from the engine. The apparatus, preferably in microprocessor form, computes a fuel control correction based on the difference between the sensed oxygen level and a desired oxygen level in each exhaust manifold. The correction is applied in the form of a change to the pulse width of a binary control signal applied to a solenoid valve. In the illustrative embodiment, the solenoid valve is coupled to a fuel pressure regulator and functions to vent an air chamber in the regulator when the solenoid is actuated. Changing the pulse width of the control signal varies the average fuel pressure and thereby controls the air/fuel ratio, which in turn corrects the oxygen level in the exhaust manifold. The controller also monitors various temperatures in the engine and selectively disables control of the air/fuel ratio when selected temperatures fall outside assigned limits.

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