Abstract: A device modifies the signals for the control unit of an electronic fuel injection system of an internal combustion engine in order to reduce lengthwise vehicle vibrations. The signals are derived from a tachometer that measures the engine speed and a gauge that measures the air flow supply to the engine. The device dampens the a.c. components in the signal either symmetrically or asymmetrically. This device can be in the form of a passive RC circuit with diodes to determine the operating points or it can be an active circuit.

Abstract: A gas valve having first and second redundant valve members, disposed in a passageway between an inlet and an outlet of the valve which are individually operable to open and close respective inlet and outlet valve ports, and a pressure regulating apparatus interposed between the inlet and outlet valve ports operable to supply gas to the outlet valve port initially at a pressure lower than the inlet pressure when the first and second valve members are operated to open respective valve ports, and to gradually increase the pressure of the gas supplied to the outlet valve port until the outlet pressure equals a value intermediate the inlet pressure and the initial outlet pressure, as established by a pressure regulator spring of the pressure regulating apparatus. The gas valve is disclosed with reference to an application in a fuel ignition system to regulate gas flow to a combustion box to minimize ignition noise and rollout of gas flame from the combustion box.

Abstract: A fail-safe energizing circuit for effecting the operation of a functional device, such as a relay, includes a resistor and a capacitor connected between outputs of an AC signal source which supplies an AC signal for charging the capacitor, a normally disabled silicon controlled rectifier connected in shunt with the capacitor and an operate coil of the relay and operable when enabled to provide a discharge path for the capacitor permitting the capacitor to discharge over the relay coil to operate the relay, and a control circuit operable to provide an enabling signal derived from the AC signal for enabling the silicon controlled rectifier. The energizing circuit is described with reference to an application in an automatic fuel ignition system for controlling the operation of a relay which energizes a fuel valve of the system.

Abstract: A control valve providing various predesignated output signals in response to changes in the pressure of a fluid input signal including a position responsive member mounted for operative connection with such fluid input signal for movement to various positions to direct the fluid input signal outwardly as a selective output signal.