Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1984-03-27
1986-05-06
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123416, F02P 504
Patent
active
045864730
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for the self-adaptive control of the angle of ignition advance of a thermal engine having positive ignition, i.e. a method of control which does not relate to fixed laws of correspondence between the angle of advance and the operating parameters of the engine, such as the engine load or torque, its speed of rotation or the speed of the engine, its operating temperature, atmospheric pressure, the octane rating of the fuel etc., certain of which develop as a function of other parameters in accordance with predetermined families of curves or tables.
Conventional methods of control of the angle of advance which relate to these laws or tables of correspondence, which may be recorded and are called "angle of advance cartography" are used in both mechanical and electronic devices which comprise sensors for detecting certain parameters which only take into account these preferential parameters, for example the speed of rotation and the load of the engine, in order to deduce the angle of advance therefrom.
These known methods are therefore disadvantageous in that they do not in general take into account all the operating parameters of the engine, and do not therefore enable optimum control of the angle of advance, and may only be used with costly and complex devices which comprise numerous sensors.
The invention relates to a method for the self-adaptive control of the angle of advance, which counters the above-mentioned drawbacks, the application of which enables a constant setting of the angle of advance to its optimum value or to a value which is very close thereto, as a result of the fact that all the operating parameters of the engine are implicitly taken into account.
The invention also relates to a method which takes into account additionally, for the setting of the angle of advance, the manufacturing tolerances and variations of the components of any devices designed to carry out the method, as well as the ageing of the engine.
The invention relates further to a method designed to be carried out with a device which does not comprise the various sensors required for the known methods, and which does not comprise in particular sensors for the engine load, such that this device may be of a simpler and less costly construction, simply requiring a positional sensor (for example detecting a component embedded in the engine flywheel) acting as an angular reference for the crankshaft position, and a second sensor detecting the teeth of a ring gear connected to the drive shaft, for example the starting ring gear, and acting as an angular definition for the ignition advance, one or other of these two sensors acting as an engine speed sensor.
In the case of a method of this type for the self-adaptive control of the angle of ignition advance of a thermal engine with positive ignition, designed in particular for use with a motor vehicle, as described in the U.S. Pat. No. 3,142,967, an iterative search operation for the optimum value O.sub.opt of the angle of advance is carried out, this operation comprising:
the periodic addition of an angle of advance increment .DELTA..theta. to an instantaneous angle of advance .theta..sub.o,
the detection of the instantaneous speeds N of the engine which correspond to the angles of advance .theta..sub.o and .theta..sub.o +.DELTA..theta.,
to determine the direction of speed variation .DELTA.N of the engine, and to correct the angle of advance .theta..sub.o so that the speed variation .DELTA.N is as low as possible, or even zero, such that the angle of advance .theta..sub.o is kept in the vicinity of its optimum value .theta..sub.opt.
In accordance with the invention, in order that the periodic angle of advance increment .DELTA..theta. is added to the instantaneous angle of advance .theta..sub.o synchronously with the engine speed, the detection of the instantaneous speeds of the engine N is carried out at the end of each half-period of the iterative operation, and the half-period is selected as a function of the speed N of the engine, such that
REFERENCES:
patent: 4379333 (1983-04-01), Ninomiya et al.
patent: 4428342 (1984-01-01), Suzuki et al.
patent: 4467765 (1984-08-01), Suzuki et al.
Argenbright Tony M.
Equipements Automobiles Marshall
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