Internal-combustion engines – Engine speed regulator – By changing valve lift
Patent
1983-03-24
1985-06-25
Cuchlinski, Jr., William A.
Internal-combustion engines
Engine speed regulator
By changing valve lift
123342, 123357, 123361, F02D 900
Patent
active
045247404
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a coupling means between an output control member of an internal combustion engine and an actuator member. This coupling means is provided for use with actuator members which actuate a servomotor by way of an electronic control unit. The servomotor controls the output control member of the internal combustion engine.
BACKGROUND ART
Energy conservation has lately acquired increasing significance. In conventional internal combustion engines of automotive vehicles an actuator member, commonly the accelerator pedal, is usually rigidly connected to an output control member. In gasoline engines the output control member is as a rule a throttle valve; in Diesel engines it is the control plunger. Owing to this rigid connection there exists a definite relationship between the position of the actuator member and the position of the output control member. This definite relationship is disadvantageous in that the internal combustion engine is driven more or less frequently at unfavorable operating conditions at which it operates at a relatively high specific fuel consumption.
With a view to avoiding this disadvantage German patent specification DE-OS No. 29 26 105 proposes a coupling means of the kind under consideration in which the accelerator pedal is connected to the throttle valve by means of a Bowden wire, the throttle valve being additionally actuated by a servomotor which is controlled by an electronic control unit.
This arrangement is such that with increasing actuation of the accelerator pedal the throttle valve may increasingly be moved to its open position, the position of the accelerator pedal determining the minimum opening of the throttle valve. The servo motor, except when the valve is fully open, may move the valve from any opening to a wider opening which results in slackening of the Bowden cable. This prior art arrangement brings about an initial acceleration of the internal combustion engine in accordance with the position of the throttle valve as set by the accelerator pedal. As soon thereafter as a consumption efficient curve in a torque performance graph stored within the electronic control unit is reached, the throttle valve is automatically opened further by the servomotor in such a manner that the internal combustion engine accelerates further along this chosen consumption efficient curve.
One characteristic of this known device resides in the fact that the electronic control unit cannot move the throttle valve to its closed or slightly open position when the accelerator pedal is positioned at mid-range, for instance. Because of this the operative range of the electronic control unit is limited.
DISCLOSURE OF THE INVENTION
The task of the invention lies in further to develop a coupling means of this kind in such a manner that in spite of the given direct connection between the actuator member and the output control member, which assures operability of the internal combustion engine even when the electronic control unit is defective, as broad an operative range as possible is provided for the electronic control unit.
The task is accomplished by the elements defined in claim 1.
By means of the coupling of the invention provided between the actuator member and the output control member, the minimum opening of the output control member determined by the mechanical connecting means is reduced in accordance with the position of the actuator member so that the range of openings of the output control member between a given minimum opening and the fully open position as determined by the electronic control is increased. Thus, the possible operating range of the electronic control unit is increased without giving rise to the possibility that the internal combustion engine is no longer controllable by the actuator member in case of failure of the control unit. In such circumstances the controllability is merely rendered slightly less precise by the coupling means of the invention.
Claims 2 and 3 are directed to advantageous embodiments of the coupling mean
REFERENCES:
patent: 3217827 (1965-11-01), Pickles
patent: 3348626 (1967-10-01), Thorner
patent: 3721309 (1973-03-01), Donaldson
patent: 4210110 (1980-07-01), Krebaum et al.
patent: 4362138 (1982-12-01), Krueger et al.
patent: 4453516 (1984-06-01), Filsinger
Audi NsU Auto Union AG.
Cuchlinski Jr. William A.
Hormann Karl
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