Method for the self-adaptive control of the angle of ignition advance of a thermal engine having positive ignition
First Claim
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1. A method for the self-adaptive control of the angle of ignition advance of a thermal engine having positive ignition, in particular for use in a motor vehicle, in which an iterative search operation for an optimum value θ
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opt of the angle of advance is carried out, the method comprising the steps of;
periodically adding an angle of advance increment Δ
θ
to an instantaneous angle of advance θ
o,detecting the instantaneous speeds N1 and N2 of the engine corresponding to the angles of advance θ
o and θ
o +Δ
θ
, respectively,determining the direction of variation of the speed N of the engine,correcting the angle of advance θ
o such that the speed variation Δ
N is as low as possible, or even zero, so that the angle of advance θ
o is kept in the vicinity of its optimum value θ
opt,detecting instantaneous speeds N1 and N2 of the engine at the end of each half-period of the iterative operation,selecting the duration of the half-period as a function of the speed N of the engine,determining the direction of variation of the speed N of the engine by comparing the speed N1t at the end of a half-period with no angle of advance increment Δ
θ
, during a measurement of rank t, with the speeds N2(t-1) and N2t at the end of half-periods with angle of advance increments Δ
θ
respectively during the previous measurement of rank t-1 and during the measurment of rank t,correcting the angle of advance θ
o by respectively adding thereto or subtracting therefrom a value ε
θ
≦
Δ
θ
if the speed N1t is, for a number m of comparisons between 1 and 10, respectively lower or greater than the speeds N2(t-1) and N2t, in order to bring the instaantaneous angle of advance θ
o toward its optimum value θ
opt in a progressive manner, while avoiding correction if the speeds N1t, N2t and N2(t-1) are substantially equal, and when the speed N1t lies between the speeds N2(t-1) and N2t, correcting the angle of advance by superposing curve data giving the angle of advance as a function of the engine speed.
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Abstract
In accordance with the invention, an iterative search operation for the optimum value θopt of the angle of advance is carried out by adding periodically an angle of advance increment Δθ to the instantaneous angle of advance θo, and by detecting the instantaneous speeds N1t and N2t which correspond to the angles of advance θo and θo +Δθ, and by determining the direction of variation ΔN of the engine speed so as to correct the angle of advance θo such that the variation ΔN is as low as possible, or even zero, such that the angle of advance θo is kept in the vicinity of its optimum value θopt. In the case of transitory states, a "floating cartography" is superposed and takes into account a curve of the advance as a function of the engine speed. The invention may be used for controlling the ignition advance of the engines of motor vehicles.
16 Citations
15 Claims
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1. A method for the self-adaptive control of the angle of ignition advance of a thermal engine having positive ignition, in particular for use in a motor vehicle, in which an iterative search operation for an optimum value θ
-
opt of the angle of advance is carried out, the method comprising the steps of;
periodically adding an angle of advance increment Δ
θ
to an instantaneous angle of advance θ
o,detecting the instantaneous speeds N1 and N2 of the engine corresponding to the angles of advance θ
o and θ
o +Δ
θ
, respectively,determining the direction of variation of the speed N of the engine, correcting the angle of advance θ
o such that the speed variation Δ
N is as low as possible, or even zero, so that the angle of advance θ
o is kept in the vicinity of its optimum value θ
opt,detecting instantaneous speeds N1 and N2 of the engine at the end of each half-period of the iterative operation, selecting the duration of the half-period as a function of the speed N of the engine, determining the direction of variation of the speed N of the engine by comparing the speed N1t at the end of a half-period with no angle of advance increment Δ
θ
, during a measurement of rank t, with the speeds N2(t-1) and N2t at the end of half-periods with angle of advance increments Δ
θ
respectively during the previous measurement of rank t-1 and during the measurment of rank t,correcting the angle of advance θ
o by respectively adding thereto or subtracting therefrom a value ε
θ
≦
Δ
θ
if the speed N1t is, for a number m of comparisons between 1 and 10, respectively lower or greater than the speeds N2(t-1) and N2t, in order to bring the instaantaneous angle of advance θ
o toward its optimum value θ
opt in a progressive manner, while avoiding correction if the speeds N1t, N2t and N2(t-1) are substantially equal, and when the speed N1t lies between the speeds N2(t-1) and N2t, correcting the angle of advance by superposing curve data giving the angle of advance as a function of the engine speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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opt of the angle of advance is carried out, the method comprising the steps of;
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12. A method for the self-adaptive control of the angle of ignition advance of a thermal engine having positive ignition, in particular for use in a motor vehicle, in which an iterative search operation for an optimum value θ
-
opt of the angle of advance is carried out, the method comprising the steps of;
periodically adding an angle of advance increment Δ
θ
to an instantaneous angle of advance θ
o,detecting the instantaneous speeds N1 and N2 of the engine corresponding to the angles of advance θ
o and θ
o +Δ
θ
respectively,determining the direction of variation of the speed N of the engine, correcting the angle of advance θ
o such that the speed variation Δ
N is as low as possible, or even zero, so that the angle of advance θ
o is kept in the vicinity of its optimum value θ
opt,detecting instantaneous speeds N1 and N2 of the engine at the end of each half-period of the iterative operation, selecting the duration of the half-period as a function of the speed N of the engine, determining the direction of variation of the speed N of the engine by comparing the speed N1t at the end of a half-period with no angle of advance increment Δ
θ
, during a measurement of rank t, with the speeds N2(t-1) and N2t at the end of half-periods with angle of advance increments Δ
θ
o respectively during the previous measurement of rank t-1 and during the measurement of rank t,correcting the angle of advance θ
o by respectively subtracting therefrom or adding thereto a value Σ
0 which is lower than or equal to Δ
θ
if twice the speed N1t is, for a number m of comparisons, between 1 and 10, respectively greater or smaller than the sum of the speeds N2(t-1) and N2t, so as to bring the instantaneous angle of advance θ
o gradually towards its optimum value θ
opt, while avoiding correction, if twice the speed N1t is equal to the sum of the speeds N2(t-1) and N2t. - View Dependent Claims (13, 14, 15)
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opt of the angle of advance is carried out, the method comprising the steps of;
Specification
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Current AssigneeEquipements Automobiles Marshall
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Original AssigneeEquipements Automobiles Marshall
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InventorsNguyen, Huu-Can
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Primary Examiner(s)ARGENBRIGHT, TONY MICHAEL
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Application NumberUS06/601,621Time in Patent Office770 DaysField of Search123/419, 123/416, 123/417US Class Current123/406.23CPC Class CodesF02P 5/1455 by using a second control o...F02P 5/1504 with particular means durin...F02P 5/1521 with particular means durin...Y02T 10/40 Engine management systems
