Abstract: A method of operating a low boiling point liquid fuel injection system for an internal combustion engine (1) wherein the fuel is stored in a tank (17) and has a variable vapour pressure in the tank (17) dependent upon ambient temperature. The method comprises pumping the fuel to the fuel inlet rail (15) and injectors (8, 9, 10, 11) at an absolute pressure which is maintained at a constant differential above the variable vapour pressure in the tank (17), monitoring the absolute pressure of the fuel and varying the fuel injection pulse width dependent upon the absolute pressure of the fuel together with the other usual engine parameters. The method has particular application where the fuel is a liquified gas.

Abstract: An output stage that reduces power or ground bouncing caused by a capacitive load while either a single or multiple outputs are switching at the same time. A first control means coupled to a power source generates first control signal to the gate terminal of a first MOS transistor in response to an input signal. A second control means coupled to ground generates a second control signal to the gate terminal of the second MOS transistor in response to the input signal. A first gate control means generates third and fourth control signals to the gate terminals of the first and second MOS transistor respectively, in response to the input signal, to turn on one of the first and second MOS transistors partially. A second gate control means generates fifth and sixth control signals to the gate terminals of the first and second MOS transistor respectively, in response to the input signal and the output signal, to turn on said one of the first and second MOS transistors entirely.