FR2697586A3 - Electronic adjustment device for adjusting the rotation speed of the engine of an agricultural tractor. - Google Patents

Abstract

An electronic adjustment device (1) according to the invention for adjusting the speed of rotation of the engine of an agricultural tractor comprising a power take-off, comprises at least two control push buttons (7, 8) arranged to be actuated in order to recall and adjust, by means of a regulation system (2) to which is associated a programmable electronic unit (3), at least two corresponding different rotation speeds of the motor, the values of which can be modified by a push-button of memory (9), an adjustment push-button (10) serving to automatically adjust the engine rotation speed according to the state of the power take-off detected by transducer means (5) connected to the electronic unit ( 3) of the system (2).

Description

The present invention relates to electronic adjustment devices

  for adjusting the speed of rotation of the engine of an agricultural tractor, of the type comprising an electronic regulation system with which is associated a programmable electronic unit, and a control panel provided with manual selection means electrically connected to said electronic unit for adjusting

  selectively the engine speed.

  An object of the present invention is to provide an adjustment device of the type mentioned above which

  is arranged to offer increased possibilities for self-

  matism to the tractor operator in adjusting the engine speed, even in connection with tractor operation according to the relative PTO (PTO) engaged

  Another object of the invention is to provide a dis-

  positive setting of the type mentioned above which

  to improve both the ergonomics of the settings and the operating productivity of the agricultural tractor, by a more convenient and quick adjustment of the speed of

tractor engine rotation.

  According to the invention, the above objects are achieved by means of a device of the type mentioned above for the electronic adjustment of the speed of rotation of an agricultural tractor engine, comprising at least one PTO arranged to be coupled in rotation with the engine and to be adjusted in a plurality of operating states corresponding to predetermined engine rotation speeds, characterized in that it further comprises transducer means for detecting said operating states of the PTO and to supply electrical signals corresponding to the electronic unit of the regulation system, and in that the control panel is provided with at least two control push-buttons which can be actuated to recall and adjust by means of said electronic unit at at least two different corresponding rotation speeds of the motor, a memorization push-button used to modify the v engine speed ratings which can

  be recalled by operating either of the two-

  said at least control pushbuttons, and a

  adjustment push button for automatic adjustment

  only the speed of rotation of the motor as a function of the state of the PTO detected by said transducer means.

  According to a preferred embodiment of the in-

  Vention, said adjustment pushbuttons are four in number, so as to allow memorization and immediate selective adjustment of the respective values.

  the engine speed.

  Other features and advantages of the pre-

  invention will be highlighted in the description

  tion following, given by way of non-limiting example, with reference to the accompanying drawing in which the single figure is a block diagram of the device

  electronic adjustment according to the invention.

  In the drawing, the reference numeral 1 indicates as a whole an electronic adjustment device for adjusting the speed of rotation of the engine of an agricultural tractor.

  The device 1 generally comprises

  LEMENT classic, an electronic regulator 2 known in

  self, normally actively connected to a fuel pump

  jection of the motor, to an associated programmable electronic unit 3, which can be autonomous or be part of the

regulator 2.

  The reference numeral 4 indicates a display device (optional) connected to the electronic unit 3 to indicate the set rotational speed of the motor, and the reference 5 indicates transducers arranged to detect the operating states of the socket

  force of the tractor and to provide electrical signals

  triques corresponding to the electronic unit 3 Nor-

  improperly, three different control elements are associated with the PTO (mechanical levers or push button switches): a first control element for engaging or disengaging the PTO,

  that is to say, to couple and not couple the corresponding tree

  laying against the tractor engine; a second

  control element to select the speed of ro-

  PTO ratio according to one or the other of the two different standardized speeds (540-1000 revolutions /

  minute); and a third control element for appli-

  qwer a reduction ratio at the two normalized speeds As a result, the number of transducers is variable depending on the type of control elements used, and their representation in the figure is

purely indicative.

  Reference 6 indicates a control panel

  provided with manual selection means connected electrically

  tracing to the electronic unit 3 of the

  setting 1 to selectively set the speed of rotation

  the tractor engine by means of the governor 2.

  According to the invention, the control panel 6 comprises

  takes first and second pair of buttons-

  control buttons 7,8, a memory push-button

  9 and an automatic adjustment push-button 10. Each of the control push-buttons 7,8 can be actuated in order to modify and then adjust

  permanently, by using the button-

  memory push-button 9, a motor rotation speed selected as desired by the operator, in the engine-specific revolutions / minute range In the figure, these speeds are indicated by "MAX", "MIN", "SERV 1" and

"SERV 2", respectively.

  Once the four different selected speeds are set, and memorized by the unit

  electronic 3, each of them can be recalled automatically

  matically by pressing the corresponding control push-button 7.8 The set rotational speed respects

  tive is indicated in turn by the display device.

chage 4, if we use the latter.

  By actuating instead the adjustment push button 10, in the state of engagement of the PTO, the adjustment device causes the tractor engine to rotate at a speed such that the shaft of said PTO is driven at standard speed

  selected using the respective control elements.

  The speed selection is carried out automatically, by means of the signals sent by the transducer 5, in

  depending on the state set by said control elements

  demand (540 rpm, 1000 rpm, Economic),

  as previously explained.

  It appears from the above that the adjustment device according to the invention makes it possible to obtain a large

  range of automations for immediate adjustment of the vis-

  preselected motor rotation braids, which

  appreciably improves comfort and

  operating mode of the tractor for the driver.

  Naturally, the construction details and the exemplary embodiments of the invention can be largely modified compared to what has been revealed and represented, without thereby departing from the scope of the invention.

  as defined in the appended claims.

Claims (2)

  1 electronic adjustment device (1) for adjusting the speed of rotation of an agricultural tractor engine comprising at least one power take-off arranged to be coupled in rotation to the engine and to be adjusted in a plurality of operating states corresponding to predetermined engine rotation speeds, said device (1) including an electronic system for regulating (2) the engine rotation speed with which an electronic unit is associated   programmable (3), and a control panel (6) comprising   carrying manual selection means (7,8) electrically connected to said electronic unit (3) for selectively adjusting the speed of rotation of the motor,   characterized in that it further comprises trans-   ductors (5) for detecting said operating states   of the PTO and to provide electrical signals   triques corresponding to the electronic unit (3) of the regulation system (2), and in that the control panel (6) is provided with at least two control push-buttons (7) which can be actuated to recall and adjust by means of said electronic unit (3) at   at least two different rotational speeds   dantes of the engine, a memory push-button (9) used to modify the values of the engine rotation speeds which can be recalled by actuating one or the other of said two at least control push-buttons (7), and an adjustment push button (10) for automatically adjusting the speed of rotation of the motor according to the state of the PTO   detected by said transducer means (5).   2 Device according to claim 1, characterized in that said control push buttons are at number of four (7.8).