Abstract: An internal combustion engine fuel injection control has two groups of injectors energized alternately by a pulse duration modulating control system, in accordance with a fuel demand signal. There is also a circuit controlled by V.sub.fd for changing the phase of the injection sequence when V.sub.fd is below a predetermined value to vary the timing of injection relative to the timing of engine valve actuation.

Abstract: A device for monitoring the composition of the exhaust emission of a combustion process includes a hollow elongated body open at one end thereof and an elongated substrate located in the body and defining adjacent the one end of the body an exhaust emission sensing element and a resistive heating element. The sensing element and the heating element are printed on opposite sides of one end of the substrate and are electrically connected to respective first conductive areas extending to the opposite end of the substrate. A carrier is mounted in the other end of the body and supports at least two terminal members which are electrically connected to respective second conductive areas provided on first and second elongated, flexible circuit elements which at their free ends project from the carrier and are folded inwardly so that said second conductive areas are presented to each other.

Abstract: An ion discharge type gas flow meter with an impedance control determining the total discharge current includes a humidity compensation circuit which varies the impedance control to compensate for changes in humidity.