Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Patent
1997-05-01
1998-06-23
Dombroske, George M.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
73116, 731173, 123419, 123436, G01L 300, G01M 1500
Patent
active
057714835
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a method and a device for measuring the torque of an internal combustion engine and, more precisely, to improvements to this method and device for measuring the aforementioned torque as described in French Patent No. 9,111,273 filed by the applicant.
2. Discussion of the Background
In this patent a device is described to produce a numerical value Cg which is representative of the mean gas torque generated by each combustion of the gaseous mixture in the cylinders of a combustion engine at low level operating conditions. This device comprises: connected to the inertial flywheel of the engine or the shaft; a fixed manner in the vicinity of the ring gear; representative of the instantaneous passage time before the sensor of each of the references; secondary numerical value T which is representative of the total passage time before the sensor of each series of n references in the angular range of the combustions of the engine; representative of the projection onto a phase reference line of the references, corresponding to the origin of the angular periods of the combustions, of the amplitude of the alternating component of the instantaneous passage times di of the references before the sensor, at the frequency of the combustions in the engine. The defining relation D is: ##EQU1## hereafter called the initial relation calculation means to derive the desired numerical value Cg from the relation Cg=A.multidot.d d/T.sup.3 +B/T.sup.2, where A and B are experimentally determined constants.
In a variant, the same patent proposes, to decrease the calculation times, to regroup the n references of an angular range of combustions into three or four sets and to calculate the above-mentioned term D from the passage times of these sets before the sensor.
SUMMARY OF THE INVENTION
A first object of the invention is to propose a method and device for simplified calculation of the term D, using a small number of reference sets and producing a result which is essentially identical to that supplied by the initial calculation procedure, while at the same time considerably decreasing the number of mathematical operations required.
A second object of the invention is to propose a method and complementary device either of the fundamental method described in the patent referenced above, or of the method and device according to the first object of the present invention, to measure the variations at a low frequency of the resistant torque applied to the engine to allow the assignment of a quality factor to the torque measurement performed.
A third object of the invention concerns a method and device derived from the preceding ones to correct the low-frequency perturbations undergone by the engine torque, especially those caused by the oscillations of the vehicle or by sudden changes in load.
A fourth object of the invention is to propose a method and device to carry out a new correction integrating the effects of the richness of the mixture of the recirculation rate, of the exhaust gases and of the transient operating conditions of the engine. This new correction may or may not be combined with the above-mentioned corrections.
According to a first object of the invention, a method for the calculation in a simplified manner of the term D mentioned above consists in: between consecutive explosions in the engine; this measurement horizon in a relatively small number of du.sub.0, . . . , du.sub.m passage times of reference sets and in assigning to these times du their rank 0 . . . m in each measurement horizon; number of times having predetermined ranks, so as to produce a magnitude Q which has a nonzero frequency response at the analysis frequency of the explosions of the engine; term D=p.Q is at least for said analysis frequency and for the combination of the measurements used for Q, identical to that obtained for the term D calculated by said initial relation.
According to a first embodiment of the preceding method, the measurement horizon exactly correspond
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Moine Xavier
Taupin Jean-Marie
Dombroske George M.
Renault
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