Exhaust gas recirculation rate control device
AssigneeNissan Motor Co., Ltd.
InventorGiichi Shioyama
Life of this patent
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Abstract
A fuel injection time is calculated from a flow rate of intake air to an internal combustion engine. A rotational speed of the engine is sensed. A desired recirculation rate of exhaust gas is determined by a central processing unit from the fuel injection time and the rotational speed of the engine using memory which contains a two-dimensional look-up table, each lattice point in the table being defined by axes of fuel injection time and rotational speed of the engine, and each lattice-point containing the value of a desired recirculation rate of exhaust gas.
Claims8
In an exhaust gas recirculation system for an internal combustion engine having a valve for controlling a flow rate of exhaust gas recirculated from an exhaust gas outlet to an intake air inlet of the engine, a control device comprising:
- (a) first sensor for measuring a flow rate of intake air to the engine;
- (b) second sensor for measuring the rotational speed of the engine;
- (c) first calculating means for determining fuel injection time from the output of the first sensor;
- (d) memory in which is stored a two-dimensional look-up table of exhaust gas recirculation rates for a lattice of points representing values of rotational speed of the engine and fuel injection time;
- and
- (e) second calculating means adapted to refer to the look up table and determine data corresponding to the fuel injection time calculated and the rotational speed of the engine measured, and supplying the data for control of the valve.
Dependencies are inferred from the claim text.