Abstract: A power unit comprises an internal combustion engine adapted for operating with natural induction, supercharged by a turbine-compressor unit receiving the exhaust gases of the engine. The compressor supplies air to the engine through an intake pipe provided with an atmospheric air inlet closed by a check valve in operation under load. The power of the engine is controlled by a power control member movable by an operator between a maximum power position and an idling position. An inlet valve, placed in the air inlet of the compressor and movable between an open position and a closed position, is biased towards closure by the power control member when the latter is moved towards its idling position. A locking member responsive to air pressure at the outlet of the compressor cooperates with said inlet valve to prevent its closing as long as the air pressure at the outlet of the compressor is greater than a predetermined threshold.

Abstract: This disclosure deals with an aneroid for an internal combustion, compression-ignition engine including a turbocharger. The engine further includes a fuel supply system including a fuel supply rail connected to carry fuel to a plurality of fuel injectors and a regulator for regulating the pressure of the fuel in the supply rail. The quantity of fuel injected in each operating cycle of the engine is a function of the fuel pressure in the supply rail. The aneroid is connected in the rail between the regulator and the injectors, and it includes valve means operative to gradually increase the fuel pressure in the rail downstream of the aneroid, in response to a rise in manifold air pressure. The aneroid further includes means responsive to the downstream fuel pressure for adjusting the valve means to reduce the fuel pressure in response to a rise in the downstream fuel pressure.

Abstract: A supercharged engine is provided with a by-pass pipe through which all the air from the compressor which is not absorbed by the engine flows towards the turbine through an auxiliary combustion chamber. There is provided a system for supplying fuel to the combustion chamber, comprising means for regulating the flow rate of fuel supplied to the auxiliary chamber so as to prevent the supercharging pressure falling below a set value; in which power unit the regulating means comprise sensing means sensitive to the quantity of fuel injected per cycle into the engine so that each value of the said quantity of fuel is made to correspond to a particular set value of supercharging pressure.

Abstract: A valve in the fuel line of an internal combustion engine of the type which is normally biased to its closed position, causing engine shut-down, but prevented by an opposing oil pressure from doing so; the valve, in effect, therefore being one which promotes engine shut-down in the event of failure in the engine oil pressure. As an improvement to this class of valves, of which the within valve is a significant contribution, the valve has an engine shut-down function related not merely to the required oil pressure at engine start-up, but also to required oil pressures at full power speed as well as intermediate power speeds throughout its contemplated range of operation.

Abstract: An air pressure regulating arrangement for regulating charging air pressure of an internal combustion engine which is provided with an exhaust gas turbo-charger including a charging blower and an exhaust turbine. A pressure regulating device responding to charging pressure of a charging blower operates a control device arranged in an exhaust channel by passing the exhaust turbine with the charging air pressure between the charging blower and a load regulating member of the internal combustion engine being monitored so that, upon exceeding a predetermined charging air pressure, the fuel supply to the internal combustion engine is interrupted until such time as the charging air pressure is decreased to the predetermined air pressure whereupon the fuel supply to the engine is then restored.

Abstract: A fuel control system to provide an excess fuel quantity during engine acceleration and including manifold pressure actuated control units. The pressure increase in one control unit is delayed by throttling, resulting in net differential control forces tending to increase the fuel supplied to the injection nozzles of the engine injection system while the manifold pressure is rising.

Abstract: An internal combustion engine, particularly for use with a vehicle having a turbine-driven supercharger for supplying air to the intake manifold. The turbine is continuously driven by a pressurized fluid, particularly water, which is continuously maintained in a liquid state. The water is stored within a tank and is supplied by a pump to the turbine for rotatably driving same. The pump also supplies the pressurized water to a further passage which communicates with the intake manifold to selectively permit injection of water into the fuel-air mixture supplied to the combustion chamber.

Abstract: A load follow-up device for use with an internal combustion engine equipped with a supercharger, comprises detector means operatively connected to the engine for sensing a sudden application of load to the engine; air feed means for feeding air into the engine cylinder; intake air relief means for discharging a portion of the pressurized air present within the intake manifold into atmosphere; means for forcedly shifting the fuel rack towards the fuel increasing side; and control circuit means connected to the detector means for operating the air feed means, intake air relief means and fuel rack shifting means in response to instruction from the detector means. The air feed means, intake air relief means and fuel rack shifting means are so arranged that they operate to faithfully follow up the application of an additional load, thereby preventing reduction in engine speed.