FR2791174A1 - DEVICE FOR ADJUSTING THE POWER CONSUMPTION OF AN ENERGY CONSUMER - Google Patents

Abstract

The device comprises a control member (1), mounted movably along a stroke comprising a neutral position (4), a position (5) for temporal increase in power, a position (6) for temporal decrease in power. power and a power reset position (7), an electronic power adjustment, controlled by the control unit (1), and two detection modules, with two states, to detect the different positions of adjustment of the control member (1), the different combinations of the respective states of the detection modules corresponding respectively to the different adjustment positions of the control member (1). The invention applies well to electric hotplates.

Description

DEVICE FOR ADJUSTING THE POWER OF

  ENERGY CONSUMPTION OF A DEVICE

ENERGY CONSUMER

  The invention relates to a device for adjusting the energy consumption power of an energy consuming device, such as a device for adjusting the heating power of an electric heating plate. There are mainly two types of plate adjustment devices

  heating, to use this example again.

  The devices of the first type include a control button, rotary, and a potentiometer. They allow discreet adjustment of the heating power of the plate. This can therefore take a plurality

  discrete, predefined values, including zero.

  The devices of the second type also include a rotary control button, which can be driven in rotation around a neutral position to the right, in a position to increase the heating power over time, or to the left, to a position time decrease in heating power. Thus, by turning the knob to the right, or to the left, and keeping it in this position for a determined adjustment period, the heating power is increased, or decreased, by a value proportional to the duration of setting. The button returns by elastic return to the neutral position, in which the power of

  heating remains constant and equal to that previously set.

  Buttons of the second type are cheaper than those of the first type. However, they do not allow instantaneous reset of the heating power. To achieve this, the knob should be turned to the left and held in position for an adjustment period

  sufficient to reach a zero heating value.

  The present invention aims to overcome this drawback.

  To this end, the invention relates to a device for adjusting the power consumption of an energy consuming device, comprising a control member mounted movable along a stroke.

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  comprising a neutral position at least one position for temporally increasing the power and at least one position for temporally decreasing the power, and means for adjusting the power, controlled by the control member, device characterized in that the stroke of the control member further comprises a positioning position

at zero power.

  Thanks to the invention, the consumption power of the device can be reset to zero instantly, by driving the control member in

io zero reset position.

  Advantageously, stop means are provided for the

  control in zero setting position.

  Advantageously also, the position of increase and the position of decrease being respectively situated on either side of the neutral position, the position of zeroing is situated beyond the position of

  decrease, on the side opposite the neutral position.

  Preferably, return means are provided in the neutral position of

the control unit.

  In a preferred embodiment, two detection modules are provided, with two states, for detecting the different adjustment positions of the control member, the different combinations of the respective states of the detection modules corresponding respectively to the different

  adjustment positions of the control member.

  In a particular embodiment, each detection module

  includes a two-position switch, open and closed.

  The two switches may include conductive tracks and a contact finger, integral with the control member and arranged for

  cooperate by contact with the tracks in order to actuate the switches.

  It should be noted here that the term "actuate" relates equally to the action of

  closing only when the switch opens.

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  The invention will be better understood using the following description of

  different embodiments of the adjustment device of the invention with reference to the accompanying drawing in which: - Figure 1 shows a front view of a control button of the adjustment device, according to a first embodiment; - Figure 2 shows a view of the return mechanism of the control button of Figure 1; - Figure 3 shows a view of the return mechanism of the control button of the adjustment device, according to a second embodiment io; - Figure 4 shows a view of an end part of a support pin, on which is mounted the button of Figure 1; - Figure 5 shows a diagram of an electronic power adjustment and two switches for detecting the adjustment positions of the i5 control button of the device of Figure 1; - Figures 6 to 9 show different embodiments of a system for detecting the adjustment positions of the control button of the

  adjusting device of the invention.

  In the particular example of the description, the adjustment device is

  intended to regulate the heating power of an electric heating plate.

  It comprises a member 1, in this case a button, for controlling the adjustment of the heating power of the plate, at different adjustment positions, a system for detecting the different adjustment positions of button 1, and

  an electronic 20 for adjusting the heating power of the plate.

  The control electronics 20 is intended to vary, in other words to

  adjust the heating power under the control of button 1.

  The detection system and the control electronics 20 are integrated into

  a housing, not shown, out of which the button 1 projects.

  The control button 1 comprises a female housing, not shown, for receiving an end part 2a of a support axis 2, of axis 3, providing a flat 19 (FIG. 4), intended to secure in rotation the button 1 and axis 2, the housing for receiving part 2a being of shape complementary to that of part 2a. Support axis 2 and therefore

  button 1 are rotatably mounted around axis 3.

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  The button 1 is intended to be driven in rotation along a drive stroke comprising a neutral position "'T'" 4, a position "+" 5 for temporally increasing the heating power, a position "- "6 for time reduction of the heating power and a" 0 "position 7 for resetting the heating power. The increase position "+" 5 and the decrease position "-" 6 are located on either side of the neutral position 'T' 4, respectively to the right and to the left of it from the point of view of 'a user, and the reset position "0" 7 is located beyond the decrease position "-" 6, on the side opposite the neutral position "' T '" 4. The

  io button 1 supports a position indicator 8.

  In the increase position "+" 5 and in the decrease position "-" 6, the button 1 is intended to respectively control a time increase and a time decrease in the heating power. In other words, the button 1, driven in the increase position "+" 5, or in the decrease position "-" 6, and held in this position for a determined adjustment time T, is intended to control an increase , or a decrease, of the heating power, proportional to the setting time T. In neutral position "'T'" 4, button 1 is intended to control the maintenance of the heating power at a constant value equal to the one previously set. Finally, the reset position "0" 7 enables the heating power to be zeroed instantly. A spring 9 for returning the button 1 to the neutral position "'T'" 4, in the form of a spiral, is integral, at one of its ends, with the support axis 2 and, at its

other end of the housing.

  The axis 2 supporting the button 1 also supports an abutment finger, not shown, projecting laterally from the support axis 1 and intended to cooperate with an abutment secured to the housing, in order to block in rotation the button 1 in the position of zero setting "0" 7 and thus limit the rotation to the left of button 1. The zero setting position "0" 7 thus constitutes a

button stop position 1.

  The detection system, shown in FIGS. 5 and 6, comprises two detection modules 9, 10 with two states, in this case two switches Il 9,

  I2 10 with two positions, open and closed.

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  Each electric switch Il 9 (I2 10) comprises two contact poles 9a, 9b (10Oa, lOb) and a contact element 9c (0lc), movable between a closed position, in which the contact element 9c (0lc) connects the two contact poles 9a, 9b (10a, 1Ob), and an open position, in which the two contact poles 9a, 9b (1Oa, 1Ob) are not connected to each other. The two poles 9a, 10a are connected to each other and to a common port 21 for connection to the control electronics 20. The two poles 9b, 10Ob are respectively connected to two separate ports 22, 23 for connection to

the control electronics 20.

  Structurally, the assembly of the two switches Il 9, I2 10 comprises three conductive contact tracks 11-13 and a movable electrical contact finger 14, intended to slide on the contact tracks 11-13 and to cooperate with them by contact so actuate the switches Il 9, I2 10, in other words i5 in order to open or close them. The contact tracks 11-13 are printed on a substrate secured to the housing and respectively connected to the ports 21-23 for connection to the adjustment electronics 20. The contact finger 14

is integral with the support axis 2.

  The finger 14 is movable, in circular translation, along a race comprising four adjustment positions 15-18: a neutral position "'T'" 15, an increase position "+" 16, a decrease position " - "17 and a reset position" 0 "18, corresponding respectively to

  four adjustment positions 4-7 of button 1.

  The three contact tracks 11-13 extend respectively along three adjacent arcs of a circle of axis 3. The first track 11 extends continuously between the increase position 16 and the decrease position 17 and slightly beyond these positions 16, 17. The second track 12 extends continuously between the increase position 16 and the neutral position 15 and slightly beyond these positions 16, 15. The third track 13 comprises two portions 13a and 13b. These two track portions 13a and 13b extend over and slightly on either side of the increase position 16 and the position of

decrease 17, respectively.

  The finger 14 is intended to connect the two tracks 11, 12 and the track portion 13a, in the "+" increase position 16, the two tracks 11, 12, in the neutral position 15, and the track portion 13b and the track 11, in the decreasing position "-" 17. In the zeroing position, the finger 14 is not in contact with any

tracks 11-13.

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  It will be noted here that because the contact tracks 1 1-13 extend over a non-point surface, there is in fact, for each setting ("'", "+", "-" and "0") , a plurality of possible adjustment positions located close to each other. For the sake of clarity, we will speak, for each adjustment, of "the" adjustment position, this being able to be any one of the plurality of

neighboring adjustment positions.

  The contact tracks 11, 12 and 13 respectively constitute the two poles 9a, 10a, the pole 9b and the pole 10b. Contact finger 14 plays the role

  contact element 9c, 10 Oc for each of the switches Il 9, I2 10.

  The different combinations of the respective positions of the two switches Il 9 and 12 10 correspond to the different positions of the button

  1, as shown in Table 1.

Table 1

  Positions Switch II Switch 12 Control button closed closed + closed open I

opened closed -

  open open O Contact tracks 11-13 are supplied with electric current and a current detector is provided to measure the value of the current through each switch Il 9, 12 10 and thus allow the control electronics

  determine the position, open or closed, of each switch.

  The control electronics 20 are arranged to interpret each combination of positions of the switches Il 9 and I2 10 as a specific control command for the heating power, in accordance

  to the correspondence specified in Table 1.

  After the structural and functional description of the adjustment device,

  its operation will now be explained.

  In the initial state of rest, the power of the heating plate is zero. The control button 1 and consequently the contact finger 14 are in the neutral "" T "" position 4, 15. In this position, the contact finger 14 connects the

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  two contact tracks 11 and 12, thereby closing the switch Il 9 and leaving the switch 12 open 10. The control electronics 20 therefore keeps the heating power of the plate constant and equal to the zero value. To heat the plate, a user turns the button 1 to the right, against the return action of the spring 9, in order to bring it into the increase position "+" 5, and hold it in this position for a period of Ti setting. Under the action of driving the button 1, the contact finger 14 is driven into the "+" increase position 16 in which it connects the two tracks 11, 12 and the track portion 13a. During the time TI, the switches Il 9 and I2 10 are thus closed and the control electronics therefore increases the heating power by a value Pl, proportional

at duration Ti.

  After the duration 'r, the heating power having reached the desired value, equal to Pl, the user releases the button 1 which returns to the neutral position "1" 4, under the spring return action 9. The finger of contact 14 thus returns to neutral position 15. In this position, the switches I, 9 and I2 10 being closed and open respectively, the control electronics 20 keeps the heating power constant and equal to the previously set value Pi. To decrease the heating power, the user turns the button 1 to the left, against the return action of the spring 9, in order to cause it to decrease position "-" 6, and keep it in this position for a period of r2 setting. Under the action of driving the button 1, the finger 14 is driven into the decreasing position "-" 17, in which it connects the track 11 and the portion of track 13b. During the period T2, the switches Il 9 and I2 10 are thus respectively open and closed and the control electronics 20 therefore reduce the heating power by a value P2, proportional to the

  duration T2, P2 being here less than Pl.

  After the duration 'T2, the heating power having reached the desired value, equal to (P1 - P2), the user releases the button 1 which returns to the neutral position, under the return action of the spring 9. As previously explained , in this neutral position "'T'" 4, the heating power is

  kept constant and equal to the previously set value (Pl - P2).

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  To instantly reset the heating power, the user turns the button 1 to the left, against the return action of the spring 9, as far as it will go, thus driving it to the reset position "0" 7, and immediately releases the button 1 which returns to the neutral position "'T'" 4, under the return action of the spring 9. Under the action of driving the button 1, the finger 14 is driven into the position of zero setting "0" 18 then immediately recalled to the neutral position "I" 15. In the zero setting position "0" 18, the finger 14 does not connect any of the contact tracks 11-13. The switches Il 9 and I2 10 are therefore both open and the control electronics 20 puts

  therefore zero heating power, instantly.

  The various embodiments which will now be described differ from the first embodiment described above only in the structure of the system for detecting the adjustment positions of the control button.

  heating power adjustment control.

  In a second embodiment, the detection system comprises two detection modules, each comprising an electrical switch I, and I2 36 with two positions, or states, open and closed, arranged to cooperate with a shaft 30, of axis 31 , supporting three cams 32-34 for mechanical actuation of the two switches Il 35 and I2 36. The shaft 30 is rotatably mounted around the axis 31 and integral in rotation with the control button. Each switch Il 35 (I2 36) comprises two contact poles, not shown, and a contact element 37 (38), mounted movable in translation between a deployed position, to open the switch Il 35 (I2 36), in which the two contact poles of the switch Il 35 0 (12 36) are not connected to each other, and a depressed position, for closing the switch I, 35 (I2 36), in which the contact element 37 (38) connects the two contact poles of the switch I1 35 (I2 36). The displacement of the contact element 37 (38) from the open position to the closed position takes place against the return action of a spring, not shown. Two contact poles, belonging respectively to the two switches Il 35 and I2 36, are connected to a common port for connection to an electronics for adjusting the heating power. The other two contact poles of the two switches Il 35 and I2 36 are respectively connected to two separate ports

  for connection to the control electronics.

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  The two contact elements 37, 38 are diametrically opposed on the one hand and

on the other side of the support shaft 30.

  The cams 32-34 project laterally from the surface of the support shaft 30 and have the shape, in cross section, of a ring portion. They are intended to push the contact elements 37, 38, in order to move them from their open position to their closed position, against the action of

spring reminder.

  io The support shaft 30 is movable along a drive stroke comprising a neutral position "'T'" 39, a position "+" 40 for increasing the heating power, a position "-" 41 of decrease in heating power and a "0" position 42 for setting the heating power to zero, corresponding respectively to the four adjustment positions

button.

  The different combinations of the respective positions of the switches Il and I2 36 correspond respectively to the different positions of

  adjustment of the control button, as shown in table 1.

  The switches Il 35 and I2 36 are supplied with current and a current detector is provided to measure the current passing through each switch and thus allow the control electronics to determine the position, open or closed, of each switch. The adjustment electronics are arranged to interpret each combination of states of the switches Il 35 and I2 36 as a command for adjusting the heating power,

  according to the correspondence specified in table 1.

  The relative positions and the respective dimensions of the cams 32-34 are such that each adjustment position of the control button, and therefore of the support shaft 30, corresponds to a specific combination of positions.

  respective of the two switches Il 35 and I2 36, as explained below.

  In the neutral position "'T'" 39, the contact element 37 is in the depressed position for closing the switch Il 35, under the thrust action of the cam 32, and the part of the support shaft 30, located between the two cams 33, 34, is positioned opposite the contact element 38 so that the latter is in the deployed position of opening of the switch I2 36. In this position,

  the control electronics keep the heating power constant.

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  In the “+” increase position 40, the two contact elements 37, 38 are in the depressed position for closing the switches Il 35 and I2 36, under the pushing action of the cams 32 and 34, respectively. In this position,

  the control electronics increase the heating power.

  In the decreasing position "-" 41, the contact element 38 is in the depressed position for closing the switch I2 36, under the pushing action of the cam 33, and the part of the support shaft 30, located between the two cams 32 and

  34, is positioned opposite the contact element 37 so that it

  O10 ci is in the deployed position of opening the switch Il 35. In this

  position, the control electronics reduce the heating power.

  Finally, in the zero setting position "0" 42, the part of the support shaft 30 situated between the cams 32 and 34 and that situated between the cams 32 and 33 are respectively positioned opposite the contact elements 37, 38, so that these are in the deployed position of opening of switches II and I2 36. In this position, the control electronics set to zero

  instantly the heating power.

  In operation, under the action of the rotary drive of the control button in the various adjustment positions, the support shaft 30 is rotated, in the various adjustment positions 39-42

  corresponding, and it opens or closes switches Il 35 and 12 36.

  Depending on the respective positions of switches Il 35 and I2 36, the control electronics regulate the heating power, as explained

  for the first embodiment.

  In a third embodiment of the adjustment device, the detection system comprises two modules for detecting the position of the control button, each comprising an optical coupler 50, 51, intended for

  cooperate with a grooved obturator disc 52.

  Each optical coupler 50 (51) comprises an optical emitter El (E2), here an electroluminescent source of light emission, and a light optical receiver R1 (R2), associated with each other. The two receptors R1, R2

  are connected to an electronic control of the heating power.

  The shutter disc 52 is integral with a support axis of the control button and intended, under the action of the rotary drive of the button, to be driven in rotation along a drive stroke comprising

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  a neutral position "'T'" 56, a position "+" 57 to increase the heating power, a position "-" 58 to decrease the heating power and a position "O" 59 to zero out the heating power, corresponding respectively to the different adjustment positions of the button. The disc 52 household, three openings 53-55, or grooves, for the passage of light, each in the form of a ring portion, extending in an annular part of the disc 52, close to the peripheral edge thereof. 1o The two optical couplers 50, 51, integral with the housing, are here diametrically opposite on either side of the disc 52. The transmitter El (E2) and the receiver Ri (R2) of each optical coupler 50 (51) are arranged opposite one another, respectively on either side of the grooved annular part of the disc 52. In operation, the transmitter El (E2) of each coupler 50 (51) emits light that the associated receiver Ri (R2) receives, by passage of light through one of the openings 53-55, or does not receive, depending on the position of the disc 52. The receiver RI (R2) is therefore either in an illuminated state, either in a non-illuminated state, and provides the control electronics with a signal indicating its state, whether or not illuminated

illuminated.

  The different combinations of the respective states of the two receivers RI, R2 correspond respectively to the different positions of the button

  adjustment, as shown in table 2.

Table 2

  States Positions RI receiver R2 receiver Control button illuminated illuminated + illuminated non-illuminated I

not illuminated illuminated -

  not illuminated not illuminated O With the aid of the status indication signals supplied by the receivers Ri, R2, the electronic control of the heating power is arranged to interpret each combination of respective states of the receivers R1, R2 as a heating power adjustment control,

  according to the correspondence specified in table 2.

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  The relative arrangement and the respective dimensions of the openings 5355 are such that each position for adjusting the control button, and therefore of the disc 52, corresponds to a particular combination of respective states of the

  two receptors R, R2, as explained below.

  In the neutral position "'T'" 56, the opening 53 and the solid part of the disc 52, located between the openings 54 and 55, extend between the transmitter E1 and the receiver R1 of the coupler 50 and between those E2, R2 of coupler 51, respectively. The receivers R1, R2 are then respectively illuminated and îo non-illuminated. In this position, the control electronics maintain the

constant heating power.

  In the "+" increase position 57, the openings 53 and 55 extend between the transmitter El and the receiver R1 of the coupler 50 and between those E2, R2 of the coupler 51, respectively. The two receivers RI, R2 are then illuminated. In this position, the control electronics increase the

heating power.

  In the decreasing position "-" 58, the solid part of the disc 52, located between the openings 53 and 55, and the opening 54 extend between the transmitter E1 and the receiver R1 of the coupler 50 and between those E2, R2 of coupler 51, respectively. The receivers R1, R2 are then respectively non-illuminated and illuminated. In this position, the control electronics decrease

the heating power.

  Finally, in the zero setting position "0" 59, the solid part of the disc 52, located between the openings 53 and 55, and that located between the openings 53 and 54, extend between the transmitter El and the receiver R1 of coupler 50 and between those E2, R2 of coupler 51, respectively. The two receivers R1, R2 are then not illuminated. In this position, the control electronics

  instantly heating power.

  In operation, under the action of the rotary drive of the control button in the various adjustment positions, the shutter disc 52 is driven in rotation and intercepts or does not intercept the light emitted by the emitters El and E2. Depending on the status, illuminated or not illuminated, of the receivers R1 and R2, the control electronics regulate the heating power,

as explained.

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  In a fourth embodiment, the detection system comprises two detection modules with two states, each comprising a magnetic Hall effect sensor CI 61, C2 62, arranged to cooperate with a shaft

  supporting three magnetic magnets 63-65.

  The support shaft 60 is rotatably mounted and integral with the control button. The two sensors C1 61, C2 62, integral with the housing, are diametrically

  opposite on both sides to the support shaft 60 and connected to electronic

  heating power adjustment.

  The support shaft 60 is movable, in rotation, along a stroke comprising a neutral position "'T'" 66, a position "+" 67 for increasing the heating power, a position "-" 68 of reduction in heating power and a "0" position 69 for setting the heating power to zero, corresponding respectively to the different positions of the control button. In operation, each magnet 63-65 creates around it a magnetic field intended to excite the sensors CI 61, C2 62. When one of the magnets 63-65 is located opposite one of the sensors CI 61, C2 62 , the latter is in an excited state and supplies a signal to the heating power control electronics indicating its excited state. On the other hand, when none of the magnets 63-65 is positioned opposite the CI sensor 61, C2 62, the latter is in an unexcited state and provides the electronics with

  setting a signal indicating its unexcited state.

  The different combinations of the respective states of the sensors CI 61, C2 62 correspond to the different adjustment positions of the

  command, as shown in Table 3.

Table 3

  States Positions Sensor C1 Sensor C2 Control button excited excited + excited not excited I

not excited excited -

  not energized not energized 0 Using the status indication signals supplied by the sensors CI 61, C2 62, the electronics for adjusting the heating power is arranged to

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  interpret each combination of states of sensors CI 61, C2 62 as a command to adjust the heating power, in accordance with

  match specified in Table 3.

  The relative arrangement and the dimensions of the magnets 63-65 are such that each adjustment position of the control button corresponds to a specific combination of respective states of the two sensors CI 61, C2 62,

as explained below.

  In the neutral position "'T'" 66, the magnet 63 and the magnetless part of the support shaft 60, located between the magnets 64 and 65, are positioned opposite the CI sensor 61 and the C2 sensor 62, respectively. The sensors CI 61, C2 62 are thus respectively excited and not excited. In this position,

  the control electronics keep the heating power constant.

  In the “+” increase position 67, the magnets 63 and 65 are respectively located opposite the sensors Ci 61, C2 62. The latter are therefore both excited. In this position, the control electronics

increases the heating power.

  In the decreasing position "-" 68, the magnet 64 and the magnetless part of the support pin 6, located between the magnets 63 and 65, are positioned opposite the sensor C2 62 and the sensor Ci 61, respectively. The sensors CI 61 and C2 62 are therefore respectively not excited and excited. In this position,

  the control electronics reduce the heating power.

  In the zero setting position "0" 69, the portion without magnet of the support shaft, located between the magnets 63 and 65 and that located between the magnets 63 and 64, are opposite the sensors CI 61 and C2 62, respectively . They are therefore not excited. In this position, the control electronics

  instantly heating power.

  In operation, under the action of the rotary drive of the control button in the various adjustment positions, the support shaft 60 is

  driven in rotation and excites or does not excite the sensors CI 61 and C2 62.

  Depending on the state, excited or not excited, of the sensors CI 61 and C2 62, the control electronics regulate the heating power, as

previously explained.

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  Instead of the two Hall effect sensors, two relays could be used

  "Reed", acting as magnetic detectors.

  Finally, in place of the spiral return spring of the control button, an elastic blade 70, shown in FIG. 3, could be provided, integral with a shaft 71 supporting the control button, and intended to cooperate with

four stops 72-75.

  The elastic blade 70 can take four adjustment positions: a neutral position "'T'" 76, a position "+" 77 for increasing the heating power, a position "-" 78 for decreasing the heating power and a position "0" 79 for setting the heating power to zero, corresponding respectively to the various adjustment positions of the control button. Two of the stops 72, 73 are diametrically opposite with respect to the support shaft 71 and positioned so as to be in abutment against the blade

  elastic 70 in neutral position "'T'" 76.

  The stops 74 and 75 are located near the support shaft 71. The stop 74 is positioned so that the blade 70 abuts against it in the "+" increase position 77. The stop 75 is positioned so that the blade 70 abuts against it in the position of

decrease "-" 78.

  In neutral position "'T'" 76, the blade 70 is straight and in abutment against the stops 72 and 73. In increase position "+" 77, the blade 70 is in abutment against

  the stops 72 and 74, by its end portion here upper which is curved.

  In the decreasing position "-" 78, it is in abutment against the abutment 73, by its lower end part which is curved. Finally, in the zero setting position "0" 79, it is in abutment against the stops 73 and 75, by its part

curved lower end.

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Claims (8)

  1- Device for adjusting the energy consumption power of an energy consuming device, comprising a control member (1) mounted movable along a stroke comprising a neutral position (4), at least one position ( 5) temporal increase in power and at least one position (6) for temporal decrease in power, and means (20) for adjusting the power, controlled by the control unit (1), device characterized by the fact that the stroke of the control member (1) further comprises a position (7) for zeroing the power. 2- Device according to claim 1, wherein means are provided   of the control button (1) in the zero setting position (7).   3- Device according to one of claims 1 and 2, wherein, the position   increase (5) and the decrease position (6) being respectively located on either side of the neutral position (4), the zero setting position (7) is located beyond the decrease position (6), on the side opposite the neutral position (4).   4- Device according to one of claims 1 to 3, wherein it is provided   means (9; 70) for returning to the neutral position (4) of the command (1).   - Device according to one of claims 1 to 4, in which it is provided   two detection modules (9, 10; 35, 36; 50, 51; 61, 62), with two states, for detecting the different adjustment positions of the control member (1), the different combinations of the respective states of the detection modules (9, 10; 35, 36; 50, 51; 61, 62) corresponding respectively to the different   adjustment positions of the control member (1).   6- Device according to claim 5, wherein each detection module (9, 10; 35, 36) comprises a two-position switch, open and closed.   7- Device according to claim 6, wherein the two switches (9,) comprise conductive tracks (11-13) and a contact finger 17 2791174   (14), integral with the control member (l) and arranged to cooperate by   contact with the tracks (11-13) in order to activate the switches (9, 10).   8- Device according to claim 6, wherein each switch (35, 36) comprises a contact element (37, 38) movable between a closed position of the switch (35, 36) and an open position of the 'switch (35, 36), the two contact elements (37, 38) being intended to cooperate with a camshaft (30), integral with the control member,   mechanical actuation of the switches (35, 36).   9- Device according to claim 5, wherein each detection module (50, 51) comprises an optical transmitter and receiver, associated with each other, arranged to cooperate with a grooved shutter disc (52), integral with the control member.   - Device according to claim 5, wherein each detection module comprises a magnetic detector (61, 62) arranged to cooperate   with a plurality of magnets (63-65) integral with the control member.   1 1- Device according to claim 9, wherein the detectors   magnetic sensors are Hall effect sensors (61, 62).   12- Device according to claim 9, wherein the detectors   magnetic are "Reed" relays.