Abstract: A battery charging station includes a first charging circuit for charging a first battery, a second charging circuit for charging a second battery and circuitry that is responsive to a pulse width modulated signal that defines a plurality of repeating charging periods, for selectively allocating, during a single one of the charging periods, battery charging energy first to one of the first charging circuit or the second charging circuit, and then to the other charging circuit. The PWM signal is preferably received from an external battery charging circuit associated with the first battery, and during a single one of the charging periods the battery charging energy is applied first to the first charging circuit and then, if at least one criteria is met, to the second charging circuit.

Abstract: The device operates by correcting the opening of an additional air control valve (13) as a function of the error E=N.sub.c -N between a set-point speed (N.sub.c) and the actual speed (N), and of the time derivative (E') of this error. The correction is a function of the deviation between the actual state of the engine (E, E') and the locus of the ideal states of the engine, defined by the pairs of specific values (E, E') which correspond to the states of the engine which allow the set-point speed (N.sub.c) to be regained without correcting the nominal opening of the valve (13). The device includes means (16, 17, 18) for outputting signals representing the error and its derivative to controllers (19, 19') whose outputs (.DELTA.u.sub.1, .DELTA.u.sub.2) are combined linearly by means (20, 20', 24) which output a signal (.DELTA.u) for correcting the nominal control of the opening of the valve (13), as a function of the aforementioned deviation.