Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1999-11-22
2000-11-21
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123458, 361153, F02M 3704
Patent
active
061488046
ABSTRACT:
A method of controlling a proportional purge solenoid is provided to improve low flow resolution. The method includes looking-up a primary duty cycle corresponding to purge current in a three-dimensional surface by using purge flow and vacuum level as inputs. Should the primary duty cycle fall below a lowest allowable purge current threshold value, a secondary purge duty cycle (i.e., an on/off pattern of the primary duty cycle) is obtained from a two-dimensional table by using the actual calculated purge flow as an input. The two-dimensional table includes a sequence of program loops subdivided into a delay region wherein the purge flow and vacuum level data are learned, an updating region wherein the purge current of the three-dimensional surface is updated, and a control region wherein the primary duty cycle is toggled between on and off states. When the current program loop falls within the delay region, a recorded primary duty cycle is output. When the current program loop falls within the updating region, the primary duty cycle is applied at a time determined during the last program sequence. When the current program loop falls within the control period, the primary duty cycle is applied at a time when the current program loop number equals a program loop number of the two-dimensional surface corresponding to the actual calculated purge flow.
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Blomquist William B.
Cheng Yi
McCourt Patrick T.
Thomson Sandra N.
Calcaterra Mark P.
DaimlerChrysler Corporation
Miller Carl S.
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