초록 ▼

A true closed-loop air/fuel ratio control system for an internal combustion engine which uses a cylinder air charge percentage value also known as a cylinder or engine load value, is used to control the air/fuel ratio of said engine in response to the difference of said measured load value and a pre

A true closed-loop air/fuel ratio control system for an internal combustion engine which uses a cylinder air charge percentage value also known as a cylinder or engine load value, is used to control the air/fuel ratio of said engine in response to the difference of said measured load value and a predetermined optimum load value. This process allows true closed-loop fuel control immediately following a cold or warm engine start without need of a traditional exhaust gas sensor. As this process automatically compensates for all fuel utilized by the engine, even during cold starting and idles, the problems associated with fuel vapor purge systems are eliminated. This process can reduce government regulated emissions from said engine considerably and improve fuel economy a significant percentage particularly when operated net lean of stoichiometric. Elimination of currently required engine hardware for traditional systems can allow for a considerable cost savings. The process allows for a significant calibration and control robustness increase without compromising emissions or causing an operational instability. The second mathematical derivative of the command control function is utilized to determine the control stability of operation with the corrections to the target load values. These values are then updated accordingly. Other modes of operation allow this use in special situations or in alternative conditions.

대표청구항 ▼

[ What is claimed is:] [1.] A method of controlling the fuel delivery rate at which fuel is supplied to the fuel intake of an internal combustion engine while the engine is operating at a desired angular speed, said method comprising, in combination, the steps of:measuring a quantity of air being in

[ What is claimed is:] [1.] A method of controlling the fuel delivery rate at which fuel is supplied to the fuel intake of an internal combustion engine while the engine is operating at a desired angular speed, said method comprising, in combination, the steps of:measuring a quantity of air being inducted into the internal combustion engine and then processing a resulting signal to determine a measured engine load value;comparing said engine load value with a table of desired engine load values to produce an indication of when said load value is either less than or greater than a desired value;responding to an onset of each indication of a load value greater than that desired by increasing fuel delivery to the engine intake until the load value is equal to or less than said desired load value; andresponding to an onset of each indication of a load value less than that desired by decreasing fuel delivery to the engine intake until the load value is equal to or greater than said desired load value.