Method and arrangement for determining a parameter of a lambda c

Details Method and arrangement for determining a parameter of a lambda c Method and arrangement for determining a parameter of a lambda c

1992-06-08

1994-03-08

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

052918734

ABSTRACT:
The invention is directed to a method for determining the particular current value of at least one control parameter for a lambda control of an internal combustion engine which provides a shift to make the fuel mixture lean or a shift to make the fuel mixture rich in dependence upon the operating state of the controlled engine. The method includes the steps of: determining a base value for the control parameter in dependence upon the current value of at least one pregiven operating variable as the current value applies for a control with a minimal discharge of toxic gas during steady-state operation of the engine; and, modifying the base value with a transition variable having a value decaying as a function of time when changes in the operating state of the engine occur. The method of the invention affords the advantage that the control parameter does not have a value which was applied for a minimum discharge of toxic gas for a typical operation sequence at steady-state or transient operation; instead, for steady-state and transient operations, optimized values are available. In this way, a discharge of exhaust gas is obtained which is lower compared to possibilities which have existed up until now.

REFERENCES:
patent: 4075982 (1978-02-01), Asano et al.
patent: 4241710 (1980-12-01), Peterson, Jr. et al.
patent: 4442817 (1984-04-01), Auth et al.
patent: 4461258 (1984-07-01), Becker et al.

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