Abstract: 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.

Abstract: 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<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.