Abstract:
A valve control mechanism is disclosed which permits the engine timing to be varied as a non-linear function of axial camshaft (4) displacement. The mechanism utilises a coupling in which radially outwardly extending pegs (107) carried by a first member (80) cooperate with a variable angular pitch spline track (106) in a second member (88) positioned about said first member (80).
Abstract:
The invention relates to a device for adjusting the movement path of the gas shuttle valve of an internal combustion engine with a camshaft. The inventive device comprises a regulator which generates an adjustment signal for an adjusting element (54) of an adjusting device (5) provided for adjusting the camshaft (3). A pilot control is provided which corrects the adjustment signal in an additive manner.
Abstract:
The object of the invention is to render a device (1) for varying the valve timing of an internal combustion engine more lightweight and produce it more simply. According to the invention, this object is achieved in that an adjusting element (3), which is acted upon hydraulically and is connected to a drive wheel (2) and a camshaft, is made from plastics.
Abstract:
The invention concerns a hydraulic control device for turning the camshaft (10) of an internal combustion engine, the device having a linkage element (23), designed as a piston (25), which is connected to a sprocket wheel (12) on the camshaft (10) by helical gearing and is connected to the camshaft (10) by straight-tooth bevels (29, 30). Flange-fitted to the camshaft is a hydraulic unit (13) accommodating a radial piston pump (14) which supplies the hydraulic fluid necessary for displacement of the piston (25). The pressure space (78) in front of the piston is closed off by a controllable pressure-relief valve (85). A solenoid valve (39) controls the flow of hydraulic fluid from an external pump (57) to the cylinder bores (62) of the radial piston pump. Translational motion of the piston (25) causes the sprocket wheel (12) and the camshaft (10) to rotate relative to each other.
Abstract:
In a device for adjusting the relative angle of rotation of a shaft to a drive wheel, especially the camshaft of an internal combustion engine, with a linear hydraulic motor as the actuating arrangement for an adjuster acting between the drive wheel and the shaft, in order to achieve a compact, space-saving unit for structural integration in/on the internal combustion engine it is proposed to arrange a hydraulic pump with a pump rotor coaxially to the longitudinal or adjustment axis of the linear motor. The pump rotor is preferably fitted to be movable in rotation at the periphery of a cylinder of the linear motor arranged as a cylinder/piston unit.
Abstract:
A device for accurately detecting an engine intake air volume based on an air volume passing through an air flowmeter in an internal combustion engine provided with a variable intake air control mechanism capable of varying the operational condition of an intake air control valve for controlling a flow of intake air into a combustion room. A throttling ratio is reduced according to the operational condition of the intake air control valve when a volumetric efficiency is lowered to calculate a throttling ratio so as to increase a throttling level. An engine intake air volume is calculated by throttling an air flowmeter passing air volume based on the obtained throttling ratio. A volumetric efficiency is calculated according to, in addition to the operational condition of the intake air control valve, an engine load and an engine revolution speed to calculate a throttling ratio based on the calculated volumetric efficiency.
Abstract:
A device for adjustment of the angular position of a shaft, preferably a camshaft of an internal combustion engine, relative to a driving wheel, comprising an adjusting device for adjustment of the angular position starting from a base position and comprising an arresting device for arresting the angular position in the base position is proposed. Between components (2, 3) capable of being respectively connected non-rotatably to the shaft and to the driving wheel, an interface (11) located eccentrically to the shaft and having a longitudinal extension running circumferentially of the shaft is provided. One part of the arresting device is formed as an arresting pin element (13) movable at an angle to the interface and the other part as an arresting recess (39) into which a portion of the arresting pin element (13) can engage when in the base position, the arresting pin element being mechanically preloaded in the engagement direction and being movable counter to the engagement direction by the pressure of a control fluid.
Abstract:
The invention relates to a device (1) for changing the duration of opening and closing of gas-reversing valves in an internal combustion engine. It is intended to avoid disadvantageous rattling caused by very frequent abutment of the adjusting piston (9) of said device in its "late" abutment position due to a lack of hydraulic pressure during start-up, using simple means. According to the invention, it is therefore provided to position a slide (19) in a driven unit (12) of the device (1), which slide acts on radially and externally acting coupling means (24). Said coupling means (24) can be moved with partial regions of the surface (27) thereof into a recess (26) of an adjustment piston (9) of the device (1), thereby preventing the adjustment piston (9) from making further axial movement when it reaches its "late" abutment position until the device (1) has been sufficiently refilled with hydraulic medium.
Abstract:
In a device (1) for changing the timing of an internal combustion engine, a hydraulic leakage gap damper (35) is fitted in its pressure chambers (13, 15). Said damper (35) prevents the undesirable clatter caused by the high-frequency striking of a displacement piston (7) in the device (1), caused by the uneven rotation of the camshaft (10) and otherwise occurring in the present state of the art, especially when the internal combustion engine is started.