Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1989-03-13
1990-08-14
Argenbright, Tony M.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
123361, F02D 902, F02D 1110
Patent
active
049478150
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
A device for adjusting the throttle valve of an internal combustion engine in a motor vehicle is known from the German Patent No. 10 23 268. This device comprises a slotted lever gearing by means of which, for one, the straight-line guidance of a gas pedal linkage is replaced by an oscillating guidance which is easier to lubricate. Secondly, an increased restoring force is produced by means of a spring, which is pretensioned between two fixed stops, and a rocker arm stop as soon as the actuating lever is positioned between a determined limiting position I and the maximum position II. Thus, a pressure point or action point is provided which tells the driver of the vehicle when a determined opening of the throttle flap has been achieved (kickdown threshold). By means of a suitable shaping of the contour of the gearing slot in the slotted lever, this device enables, in a purely mechanical manner, a transmission ratio of the accelerator pedal position onto the throttle valve position in a manner so as not to preserve the angles unaltered, but rather so as to be specifically adapted to the vehicle or engine, for example, so that a non-proportional dependency of the throttle valve position on the accelerator pedal position can also be realized in an easy manner. However, this known solution provides no measures either for making available an emergency driving function or for preventing the throttle valve from freezing fast.
As a rule, in newer systems for mixture metering which operate electronically a mechanical coupling between the accelerator pedal and throttle valve is dispensed with. Rather, in such systems the throttle valve is driven or adjusted by an electromotive actuator which receives correction commands directly from an electronic control device via an electrical line; for this purpose, the same electronic control device receives the driver's command from an accelerator pedal position transmitter also via an electrical line. Geared-down direct current motors (usually in a permanently excited construction) or so-called rotary actuators, which function in principle in a manner similar to a moving-coil instrument and occupy a determined position as a function of the average current intensity or the pulse duty factor of the operating current, respectively, in at least one regulating winding, are taken into consideration as electromotive actuators. In order to be able to operate such rotary actuators with the lowest possible electrical output, the spring constant of the restoring spring of the throttle valve cannot be made as large as desired. On the other hand, a desirably low drive output of such a rotary actuator is not sufficient under certain circumstances for "tearing loose" the throttle valve when the internal combustion engine is operating in the event that the throttle valve is frozen fast in its rest position.
In contrast, electronic systems for adjusting the throttle valve in an internal combustion engine can realize virtually any desired transmission ratios between the accelerator pedal position and the throttle valve position, e.g. by utilizing a characteristic line or family of characteristics filed in a digital storage.
Therefore, it is the object of the invention to provide a simple device in connection with timed electronic metering systems, which device allows a reliable drive of an air-metering throttle valve of an internal combustion engine with low power requirement and, in addition, eliminates the problem of a seizing throttle valve. Further, it is the object of the invention to design this device in such a way that a reliable emergency drive operation is nevertheless possible in the event of a failure of the current supply, the electronic control device for the throttle valve position or the actuator adjusting the throttle valve, so that the driver of the vehicle can drive the vehicle to the nearest repair shop in any case.
ADVANTAGES OF THE INVENTION
A first advantage of the invention consists in that the problem of the seizing of the throttle valve is overcome in tha
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Argenbright Tony M.
Mates Robert E.
Robert & Bosch GmbH
Striker Michael J.
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