Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1996-09-05
1998-05-05
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
123672, F02D 4102
Patent
active
057461643
ABSTRACT:
A method is provided for determining valve control times for a maximum charge for cylinders in a piston-type internal combustion engine provided with fuel injection, lambda sensor control and electromagnetically actuatable cylinder valves. The method includes setting the "intake closes" control moment to a preliminary value on all gas intake valves of the engine; changing continuously the "intake closes" control moment on the gas intake valves at least one cylinder while maintaining a constant engine rpm and determining, with the lambda sensor control at .lambda.=1, one of (1) a longest fuel injection duration and (2) a leanest operation at a constant injection duration; and storing the determined "intake closes" control moments at respective rpm's in a performance characteristic of an engine control for achieving a maximum charge in the cylinders at the respective rpm's.
REFERENCES:
patent: 4782798 (1988-11-01), Jones
patent: 4945870 (1990-08-01), Richeson
patent: 4995351 (1991-02-01), Ohkubo et al.
patent: 5190013 (1993-03-01), Dozier
patent: 5419301 (1995-05-01), Schechter
Schmitz Guenter
Schrey Ekkehard
FEV Motorentechnik GmbH & Co. KG
Lo Weilun
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