Abstract: The present invention concerns a linear amplifier for providing a sinusoidal waveform to a load, characterized in that the linear amplifier is composed of an asymmetric amplifier and a H-bridge module, the asymmetric amplifier comprises at least one transistor that amplifies a full wave rectified sinus signal that is transformed by the H bridge module into a sinewave signal that is provided to the load.

Abstract: Process for correcting the richness of an air-fuel mixture admitted into an internal combustion engine with electronic ignition of the pressure-speed type, to obtain a constant richness as a function of the air temperature entering the cylinders, wherein the correction is of the multiplicative type:T.sub.i =T.sub.in (1+(.alpha..sub.air)/256).alpha..sub.air =f(T')T'=T+k(T.sub.water -T)k=k.sub.1 (N)+k.sub.2 (P)+k.sub.3wherein:.alpha..sub.air is term of correction of the richness as a function of the air temperature T' actually entering the cylinders;T is the temperature of the air measured by the injection computer; andT.sub.water is the water temperature of the engine.

Abstract: According to this process, the computer determines opening time (Ti) of the injector from a nominal time (Tin) as a function of the parameters of the engine operation and of a proportional and integral correction term (.alpha. cl) as a function of the state of the signal of probe .lambda.. More particularly, a richness predictive estimate (Re) of the exhaust gases is made from the engine operating parameters and from pure delay (m), determined experimentally, between injector (2) and probe (12), at least a simulated probe signal (Ss .lambda.) is produced from said richness predictive estimate, said correction term (.alpha. cl) is produced from simulated probe signal (Ss .lambda.) and said correction term (.alpha. cl) is modified periodically in response to the detection of a difference between the state of measured probe signal (S .lambda.) and the state of a delayed simulated probe signal (S"s .lambda.). Application to vehicles with internal combustion engines.

Abstract: A process and apparatus for controlling the air flow at the intake of a heat engine fed by fuel injection. The air flow is controlled as a function of the rotational speed of the engine, particularly in the vicinity of the rated idling speed. The control point is determined as a result of a filtering made on a value linked to the instantaneous value of the rotational speed of the engine followed by a weighted average between the filtered value and a magnitude linked to the rated idling speed.

Abstract: An adaptive process controlling the injection of an engine. The injection time is continuously determined by a standard control as a function of the intake pressure or air flow of the intake. From a straight control line defined by its slope and its beginning ordinate, readjustments are periodically made, by successive adaptive cycles of the values of the slope and the beginning ordinate of the straight control line as a function of the possible richness difference found by an exhaust gas analysis probe.