Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1991-09-25
1993-05-25
Argenbright, Tony M.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
731181, F02D 4128, F02D 1110
Patent
active
052130789
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for determining at least one end position of a displacement device in a motor vehicle.
BACKGROUND OF THE INVENTION
Such a method for determining at least one end position of a displacement device in a motor vehicle is known from U.S. Pat. No. 4,506,642. A displacement device for controlling the engine power with two end positions is described there, wherein, in order to determine and store these two end positions of the displacement device, the displacement device is first driven in the direction of the first end position and, after a predetermined displacement time has elapsed, the position of the displacement device is stored as the end position. The displacement device is then driven in the direction of the second end position with the position of the displacement device being stored after a further predetermined time period has elapsed as the second end position. In this procedure, however, it is possible that, on the one hand, the recording of an incorrect end position can, for example, occur due to the flexibility of the stop and, on the other hand, due to mechanical or electrical tolerances or due to the flexibility of the stop mentioned above, an increase in the control variable of the displacement device, and thus destruction of or damage to the displacement device, can occur.
SUMMARY OF THE INVENTION
The invent is therefore based on the object of avoiding the above-mentioned disadvantages in a method of the type mentioned initially. U.S. Pat. No. 4,622,936 discloses an electronic accelerator pedal which, for the purpose of ascertaining the end positions of the throttle flap, approaches the particular end position in a controlled manner starting with a minimum or maximum desired value by increasing or reducing this desired value and detects from the manipulated variable a driving of the throttle flap toward the particular end position. The desired value then present is stored as a desired value representing the end position if the manipulated variable exceeds a predetermined value.
However, this procedure does not take into account the fact that an increase in the manipulated variable can also occur, for example, because of mechanical jamming of the throttle flap or because of friction. Furthermore, the end position is approached in a controlled manner and thus correspondingly slowly since the desire value can only be changed with a speed such that the throttle flap follows the change synchronously.
The procedure presented below eliminates the above-mentioned disadvantages of the prior art in that, when the device is driven to the particular end position, the control variable of the displacement device is interrogated and the position of the displacement device is stored as the particular end position when this control variable of the displacement device has taken on at least a particular predetermined value. This method can, in particular, be used advantageously in the determination of the end positions of an electrically controllable power actuator, in particular the throttle flap of an internal combustion engine or the injection pump of a diesel engine of a motor vehicle. By means of the features described it is possible that, on the one hand, in the case of flexible stops (such as are represented, for example, by the rubber buffers at the full-load stop of an injection pump mechanism), the displacement device is pressed into its correct position and, on the other hand, destruction of or damage to the displacement device due to a control signal which has passed beyond its permissible limits, is prevented. In this way, an accurate determination of the end positions of the displacement device is achieved and the life of the displacement device is increased.
The method according to the invention is not limited only to its use for determining end positions of the power actuator of an internal combustion engine but can be utilized wherever controllable displacement devices, whose end positions have to be determined for further informati
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Holzberg Jorg
Koch Stefan
Kolberg Gerhard
Preis Karl-Heinrich
Argenbright Tony M.
Ottesen Walter
Robert & Bosch GmbH
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