Abstract: The invention relates to an improvement in internal combustion engines equipped with a compressor for the feeding air, according to which the intake duct is equipped with a heat-exchanging element for cooling the air when the latter is compressed to a comparatively high pressure.

Abstract: This invention relates to a temperature-controlling system for the liquid coolant of an internal-combustion engine, which provides three sensing members for the temperature of said liquid in the outlet conduit from the cylinder block. Said sensors are intended to drive a valve which controls the flow of the liquid through a conduit which by-passes the radiator, a vane which controls the flow of air through a port formed through the car body, and a fan which cools said radiator respectively.

Abstract: This invention relates to a lubricating oil seal device for a rotating shaft support bearing, which is arranged to prevent the emergence of said oil from a collection chamber disposed at one end of the bearing, by means of a stream of air created in an annular meatus provided in the passage which communicates with said chamber.

Abstract: The invention relates to a motor vehicle driven by an internal-combustion engine housed in a compartment, the latter having at least one opening (24) through which the flow of air is controlled by a vane (22) which is operatively connected to means (25) sensing the temperature of the engine-cooling fluid.

Abstract: This invention relates to a timing variator device for an internal combustion engine, comprising a coupling between the cam shaft and the drive gear, which is capable of making angular movements between the coupled parts according to the rotational speed, and in which said movement is actuated by the engine lubricating oil under the control of a valve element constituting the member sensitive to the engine speed.

Abstract: This invention relates to a coolant circuit for internal combustion engines, specially for motor vehicles. In order to improve the engine operation after cold starting, there is provided a second valve which cooperates with the usual thermostatic valve so as to lower substantially to zero the flow rate of the coolant through the circulating pump and the engine when the engine and the coolant are still cold and limited power is requested.

Abstract: An internal combustion engine comprises a combustion chamber located between a spherical-cup bottom wall of the engine head and a crown top wall of the piston. The crown wall includes of five wall portions, of which first and second side portions are convex, third and fourth side portions are flat, and a fifth central portion is concave.

Abstract: A device is disclosed which detects the knocking phenomena in a controlled-ignition internal combustion engine, the device essentially comprising two ionization probes arranged in a zone of the explosion chamber remote from the sparking plug: the probes deliver signals when the state of ionization changes and the time interval between the signals of the two probes is measured and compared with an appropriate reference value.

Abstract: A device is disclosed for refining the adjustment of the angle of ignition advance in an internal combustion engine.The angles of rotation of the crankshaft relative to the top dead center of an engine cylinder, relative to the start of ignition and the completion of combustion are detected electronically and signals are processed which are expressive of the magnitudes of said angles: these magnitudes are compared in a comparison circuit which is calibrated according to an optimum preselected ratio between the two angles. The electronic comparison circuit is capable of commanding the controlled-ignition system of the engine so as to modify the angle of advance of ignition continually, keeping it constantly to the desired optimum value.

Abstract: In a controlled ignition internal combustion engine, two temperature sensors, one of which is placed in the farthest position relative to the spark plug and the other in the vicinity of the spark plug in a cylinder, generate signals the difference of which is significant for the detection of the knock phenomenon. As the temperature differential of the two sensors exceeds a preselected magnitude, a warning signal may be delivered on the dashboard, or the controlled ignition system of the engine may receive a command for reducing the angle of advance of ignition until ordinary, non-knock conditions are restored for the engine.

Abstract: In an internal combustion engine in which overheating phenomena in the explosion chamber are to be monitored and prevented, a temperature sensor is arranged in the region far from the sparking plug to send signals to a governing electronic circuitry which is arranged for modifying the ignition advance responsively to abnormal situations and for restoring normal running conditions as soon as the disturbing phenomena have ceased to occur.

Abstract: This invention relates to a timing variator for the timing system of a reciprocating internal combustion engine of the type having a camshaft for the intake valves and another camshaft for the exhaust valves. At least one of said camshafts is coupled to a driving gear through an annular piston housed in a cavity connected to the outside through a slide valve. The latter includes a valve element provided with an eccentric mass, which is able to overcome the force of a preloaded spring and to move the valve element from open to closed position when the rotational speed of the engine is higher than a predetermined value.

Abstract: A regulation device is disclosed, for regulating a physical magnitude as a function of two independent parameters: the parameters can be, for example, parameters of interest in the operation of an internal-combustion engine. Instead of the conventional space cam, a surface is provided on which the third dimension is represented by different voltage so as to define on such a planar or curved surface a family of equipotential curves. The readings taken by a conductive follower are mechanically converted so as to govern the appropriate component parts of an engine so as to have an automatical adjustment of certain parameters. The device is dependable and reliable and cannot be prone to jamming or mechanical defects. The device is of the potentiometric class.

Abstract: This invention relates to an automatic device for controlling the pressure of the intake air of an internal combustion engine as its operating altitude varies. The device according to the invention comprises first valve means adapted to keep the air pressure downstream of the said valve means substantially constant and equal to the external pressure corresponding to a predetermined altitude, first actuator means which control said first valve means as a function of an operating pressure which varies with the altitude and reaches at said predetermined altitude a value equal to the substantially constant value downstream of the first valve means, and second valve means controlled by second actuator means sensitive to an absolute pressure which is a function of the external atmospheric pressure, said second valve means being able to modulate said operating pressure.

Abstract: A catalytic muffler for internal combustion engines of cylindrical flattened construction having an inner casing containing the catalyst. Annular flow patterns are provided for gas entry and exit wherein the gas pressure and thus velocity remain substantially constant. The specific connections of the circular faces of the inner casing to the annular wall thereof are slip designed with the design of the outer half shells providing the holding force to keep the same in yieldable, contact throughout the various temperature changes undergone.

Abstract: A device for correcting the mixture ratio of fuel vapors and air for an internal combustion engine is disclosed, which comprises pressure-sensitive members of the barometric sylphon-bellows type and means responsive to the engine temperature of the same type, said two responsive means being connected by a flex transmission means which is kept loose but becomes tightened under certain conditions, such as the last portion of the throttle-opening stroke. The device in question thus effects the correction of the mixture ratio by modifying the density of the air introduced in the engine intake duct.

Abstract: A muffler for internal combustion engines to afford a better approach to the solution of air pollution problems due to unburned fuel fractions. The muffler is of the catalytic type and has a flattened structure, with the flow of the exhaust gases through the catalyst taking place in a substantially downward vertical direction. By such an arrangement the gas pressure drop through the catalyst is reduced and the catalyst efficiency is increased.

Abstract: An exhaust conveying system for internal combustion engines, in which the exhaust pipes connecting the engine head with a single exhaust manifold comprise each at least a pair of tubular members, at least one of the tubular members being made of thin sheet having circumferential corrugations, with the crests of the corrugations being adherent to the surface of the other tubular member so as to define air spaces between the tubular members. As consequence, the heat losses from the exhaust pipes are strongly reduced, thus improving the post-combustion of unburned components of the exhaust gases which takes place downstream of the exhaust pipes. The exhaust pipes can also be provided with a porous layer of a ceramic material bonded to their inner wall.

Abstract: In an electronic system for an explosion engine, a device for automatically adjusting the spark timing, wherein a follower is kept into contact with a three-dimensional cam having a surface shaped; with lifts representing the desired timing angle of the spark delivery with respect to an angular position of the drive shaft, said follower and said cam being mutually displaced in two directions orthogonal to each other and to the cam lifts as a function of variables representative of the engine operation, more particularly the engine r.p.m.

Abstract: To improve the operation of an internal combustion engine under idling conditions, a carburetor has at least a premixture chamber commmunicating through calibrated ports with a fuel induction duct and with a cavity: the latter communicates with the atmosphere through a calibrated port and with the intake duct through at least a progression passageway. The progression passageway opens in the vicinity of the throttle edge so that it is upstream of the edge when the throttle is in the minimum opening position and is, conversely, downstream of the edge when the throttle is partially open. An auxiliary duct is also provided for connecting the premixture chamber with the intake duct downstream of the carburetor.