Regie Nationale Des Usines Renault

Gilles Jehanno

This device applies to all internal combustion heat engines. It includes an electronic unit (10) associated with a ring gear (12) of the inertial flywheel and with sensor (22) with variable reluctance such as those used for electronic ignition engines. Instantaneous period d.sub.i of advancement of teeth (14-16) is produced (26-30-32-34). From signal d.sub.i, period T.sub.4 of the fraction of revolution of the flywheel corresponding to a period of the combustions is calculated (36) and stored (38). A magnitude D'.sub.4, representative of a projection of the alternating component of the angular velocity of the flywheel at the frequency of the combustions is also calculated (40-42). A calculating stage (44) combines (T.sub.4 and D'.sub.4) with constants A and B suited to the type of engine for producing signals for measuring the average gas torque for each combustion of the gas mixture in the cylinders of the engine. This makes possible optimized settings and the detection of misfirings of combustion of passenger or industrial motor vehicles.

Process and device for measuring the torque of an internal combustion

In internal combustion engines in which residual burnt gases (GBR) exist and in which a recirculation of exhaust gases (RGE) is provided as well as the engines in which the gas mixture is low in gasoline or in the case of diesel engines, a digital value Cg, representative of the average gas torque per combustion and provided by a system, not shown, is corrected as a function of total rate q of recirculation of the exhaust gases and the presence of the residual burnt gases. The correcting device comprising calculating means (56) for producing a correction factor Q.sub.2 -(1-p.sub.2.q), in which p.sub.2 is a constant close to 0.50 and q, the value of said total rate, then applying this factor Q.sub.2 to value Cg, if necessary previously corrected as a function of richness r of the gas mixture when r&lt;1, for providing a corrected digital value (Cg).sub.q or (Cg).sub.r,q. Other devices are provided for correcting Cg in the case of excess oxidant and in the case of diesel engines.

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Aubergenville, France

Gilles Jehanno