Internal-combustion engines – Charge forming device – Auxiliary air or oxygen added to combustible mixture
Patent
1989-10-20
1990-12-25
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Auxiliary air or oxygen added to combustible mixture
F02M 307
Patent
active
049794841
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a device of the generic type of the main claim. A device of this kind is already known (German Offenlegungsschrift No. 3,234,468), but in this there is the disadvantage that the complete opening of the control orifice, starting from a control orifice opening forming an emergency-running cross-section, is attainable only after traversal of the maximum control path of the throttle member, for which the maximum control current is required to excite the positioning motor. A device of this kind is used to regulate the idling speed of internal combustion engines in order, with the minimum possible speed, to achieve favorable consumption figures and emission values. Here, the lowest possible idling speed is dependent on various operating conditions of the internal combustion engine, for example on the load condition, the external temperature and the engine temperature or the power requirement of systems which are driven by the internal combustion engine, for example an air conditioning system. By virtue of this and in particular at very low starting temperatures of the internal combustion engine, the supply voltage delivered by the battery of the motor vehicle falls and the positioning motor of the idle-regulation device cannot be supplied with the necessary current to adjust the throttle member, precisely in this operating condition, to a position which opens the control orifice completely.
In addition, in the known device there is the danger that if the spring element breaks and the positioning motor is excited, the control orifice will be opened completely by the throttle member and the operation of the internal combustion engine will be influenced in an undesirable manner or even endangered.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a device for controlling at least one throttle cross-section of a throttle member operable against a spring element at at least one control orifice so that the engine operation will not be undesirably influenced or endangered, if the positioning motor is excited and the spring element broken.
It is also an object of the present invention to provide a device for controlling at least one throttle cross-section of a throttle member operable against a spring element at at least one control orifice so that engine idle is properly regulated despite a fall in battery current, especially at low temperatures.
Accordingly, these objects and others are attained in a device for controlling at least one throttle cross section of the above-described kind which is designed and structured so that a throttle member having at least one throttle orifice can be positioned relative to at least one control orifice in a bypass line of the internal combustion engine carrying an operating medium, so that a safety cross-section is opened in the bypass line, when the spring element is inoperative and the positioning motor is excited.
With a device for controlling the throttle cross section of this kind the internal combustion engine continues to run safely, but also, for example, avoids a situation in which the internal combustion engine reaches undesirably high speeds, when the spring element is broken, but the positioning member is excited.
Advantageous further developments and improvements of the device given in the main claim are possible by virtue of the measures listed in the subclaims.
It is particularly advantageous, if necessary, to move the throttle member beyond the position in which it closes the control orifice into the position which opens the safety cross-section.
It is furthermore advantageous to provide the throttle member with at least one throttle orifice which, when the throttle member is moved, starting from a position which opens the emergency-running cross-section, opens at least one control orifice to a greater or a lesser extent, it being possible for the control orifices and throttle orifices to have a rectangular or quadratic cross-section and for the safety cross-section of the control or
REFERENCES:
patent: 4426988 (1984-01-01), Greiner et al.
patent: 4428356 (1984-01-01), Kemmer
patent: 4483309 (1984-11-01), Norman et al.
patent: 4494517 (1985-01-01), Kratt et al.
Dolinar Andrew M.
Macy M.
Robert & Bosch GmbH
Striker Michael J.
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