ELECTRIC MOWER WITH AUTOMATIC BLADE RELEASE AND METHOD FOR CONTROLLING THE MOWER.

专利摘要:
The invention relates to an electric mower comprising an electric motor driving at least one rotary cutting blade, and a driving method of the mower comprising: - a rest phase (100) during which the electric motor n ' is not supplied with energy, - a mowing phase (102) during which the electric motor is driven for rotation in a first direction of rotation, corresponding to a rotation of the cutting blade in a cutting direction of plants, - a transient blade launching stage (108), during which the electric motor is temporarily driven for rotation in a second direction opposite to the first direction of rotation. Application to lawnmowers and trimmer brush cutters.
公开号:FR3046024A1
申请号:FR1563189
申请日:2015-12-23
公开日:2017-06-30
发明作者:Roger Pellenc
申请人:Pellenc SAS；
IPC主号:

专利说明:

Electric mower with automatic blade release and method of driving the mower
Technical area
The present invention relates to an electric lawn mower powered by an electric battery, having an automatic blade release function. It also relates to a method of driving such a mower, including its blade drive motor. The invention finds applications in the field of lawn mowers or trimmers battery-type brushcutters, used for the maintenance of private or public green spaces. It can be used for walk-behind mowers, walk-behind mowers and even stand-alone robotic lawn mowers.
State of the art
Lawnmowers used for maintenance of green spaces, for the most part include a cutting housing housing at least one rotating blade, and a blade drive motor. The engine may be a heat engine or an electric motor. Each blade can be driven by its own motor or all blades can be driven by a single motor. In the absence of a meticulous maintenance of the cutting deck it happens that mowing residues are fixed to the housing, and eventually form solid clumps. These clusters constitute, when they are of a certain size, obstacles to the free rotation of the blades. A clump of plants may also form when, during shearing, a quantity of plants reaching the cutting blade (s) exceeds the cutting and / or evacuation capacity of the plants.
Such clusters are likely to slow the movement of the cutting blade or blades or block them.
EP 2 425 701 proposes to modulate the cutting height of an autonomous electric mower, so as to avoid an overload of the blade being mowed, and thus a blade lock.
This measurement does not lead to a uniform height of the plants and remains difficult to transpose to walk-behind mowers, the result of mowing being mediocre from an aesthetic point of view. Better uniformity of the cut would indeed require at least one additional passage. Modulation of the cutting height is also ineffective against the clumps of plants, mentioned above, which gradually form as a result of an approximate cleaning of the cutting deck, or which form abruptly according to the conditions of density and humidity of the plants. cut vegetables.
Plant clumps that clog the mower deck and hinder the free rotation of the blades, can to some extent be overcome for mowers equipped with a heat engine for driving the blades.
Indeed, some engines are equipped with manual launchers. The actuation of the launcher by a user, to start the engine, generally causes a rotation of the forced blades in the cutting direction with a large force torque at the axis of rotation of the blade. Also, the actuation of the launcher can, because of this rotation, enough to detach clusters of plants that clutter the mower deck.
In contrast, the problem of clumps of plants in the mower deck remains unresolved for electric mowers, devoid of manual launcher. Thus, when the starting torque of the electric motor is insufficient to overcome the resistance of the clumps of plants, the cutting blade or blades remain blocked.
Unblocking requires in this case a user intervention at the blades and in particular near their cutting edge. Such an intervention is not only expensive in time but especially dangerous. It is not desirable.
Presentation of the invention
The present invention aims to provide an electric mower not having the difficulties mentioned above.
One goal is to propose an electric mower with a function of unlocking or automatic release of the blades, without user intervention at the blades.
An object of the invention is still to provide an electric mower capable of starting, notwithstanding possible clumps of plants likely to hinder the free rotation of the blades.
Yet another object of the invention is to provide an electric mower capable of overcoming a stuffing situation during mowing, causing a slowing or blocking of the blades.
Finally an object of the invention is to provide a method of driving an electric mower for automatic release of the cutting blade or blades.
To achieve these aims the invention more precisely relates to an electric mower comprising: at least one rotary cutting blade, a rotary electric motor driving the cutting blade, an electronic control unit of the electric motor configured to control a rotation of the electric motor in a first direction of rotation during a mowing phase. According to the invention, the control unit of the electric motor is further configured to control a rotation of said electric motor in a second direction of rotation opposite the first direction of rotation, during a transient blade launching phase. The control unit can also be configured to detect a possible blade blocking situation, when starting the electric motor, and to automatically initiate the blade launch phase in response to a blocking situation.
In the following description it is referred to, for simplicity, a single cutting blade and a single electric drive motor of the blade. It should be noted, however, that the mower of the invention can be provided with several cutting blades. The cutting blades may be blades rotating about a substantially vertical axis, in a mowing position of the mower, or around a substantially horizontal axis. The blades rotate about a substantially horizontal axis in the case of mowers provided with a helical cut drum.
In the case where the mower has several blades, a single blades electric drive motor can be provided. Several drive motors, for example a motor per blade, can also be envisaged. The electronic control unit is then configured for controlling the drive motor or motors of the different cutting blades. The invention is based on an observation that the impediment to rotation that constitutes a cluster of plants does not necessarily oppose the same resistance to rotation in the two possible directions of rotation of the blade. A slight movement of blade clearance is often possible at least a fraction of the blade revolution.
Transient piloting of the motor in the second direction of rotation during the blade launching phase then makes it possible to disengage the blade and to provide a free blade stroke, for example, over a fraction of a blade revolution. If this free stroke does not fully release the blade it allows at least the blade to acquire a certain speed of rotation and therefore a certain kinetic moment of rotation. The kinetic moment of rotation is used to overcome the possible blockage in the case where the only torque of the engine would be insufficient. In addition, during this fraction of rotation in the opposite direction to the direction of rotation defined for cutting, the blade can also meet the possible cluster of plants during its rotation in the opposite direction, destabilizing it then and reducing its resistance for a next encounter with the blade when it resumes rotation in the direction of the cut.
At the end of the transient blade launching phase, rotation in the first direction of rotation can be resumed. The control unit can also be configured to detect a persistent blade blocking situation during the blade launch phase and to cause, in this case, an unlocking operation including controlling a sequence of engine rotations. alternately in the first and second directions of rotation. This corresponds to a less favorable situation in which a simple retro rotation during the launch phase is insufficient to clear the blade. Controlling a new rotation sequence in a direction of rotation then in the opposite direction then makes it possible to insist and increase the chances of overcoming the blockage of the blade. The unlocking operation can be interrupted: - as soon as the blocking situation disappears, - after a predetermined duration, for example a few seconds, - at the end of a predetermined number of reversal of direction, for example a dozen inversions.
In the absence of release of the blade at the end of the sequence, the engine power can be automatically interrupted to put the engine safe and if necessary alert the driver to allow him to intervene near the blade.
The launch phase can be initiated in different ways.
According to a first possibility, the control unit is configured to initiate the blade launching phase automatically at each start of the electric motor for driving the cutting blade. In this case the detection of a possible blocking situation is not a prerequisite for the launch phase. By starting the electric motor is meant a start that can occur at the end of a storage period or an off state of the mower, or can intervene in case of stopping the rotation during use of the mower. In the latter case it is a restart.
Furthermore, it is considered that the blade launch phase is initiated automatically when it is initiated in the absence of a command from a user of the mower, specific to the blade launch phase.
A user command to start or restart the mower is not considered a specific command for the blade launch phase.
According to another possibility, and as mentioned above, the control unit can be configured to detect a blade blocking situation when starting the electric motor driving the cutting blade, and to automatically initiate the blade launch phase in response to a detection of the blocking situation.
Thus, the launch phase is not necessarily initiated in all startup cases but can be initiated only if a blocking situation is detected. In this case too, a blocking situation remains transparent for the user whose only action is then to start a start of the mower.
A blade blocking situation also results in blockage of the blade drive motor, due to their rotational coupling. It is considered that a blocking corresponds either to a total absence of rotation, to a limited rotation, less than a revolution, or to a rotation with a much lower speed of rotation, for example by a factor of 10, at a speed desired rotation.
Finally, according to a third possibility, the mower may include a control interface connected to the engine control unit, the control interface comprising a trigger member of the blade launch phase. In this case, initiation of the launching phase requires an action of the user of the mower on the manual triggering member of the interface, for example a button, a lever or a pedal. The existence of a possibility of triggering the blade launch phase by the user is not exclusive of an automatic trigger as described above.
The detection of a blade blocking situation can take place in different ways. In particular, the control unit may be provided with a measuring circuit of at least one of a current induced in a winding of the electric motor and a power supply current of the electric motor.
In the case of a blade drive motor of the brushless type, the measurement of currents induced in the motor stator windings is used to determine the position of the rotor and to control the motor supply currents. The detection of an absence of currents induced by the rotor, despite the power supply of the motor, characterizes a situation of blocking of the motor and therefore of the cutting blade.
It is considered in this case that the engine blockage translates a blade lock due to a rotation coupling of the motor and the blade. Similarly, the control unit may have a specific sensor, for example a Hall effect sensor, to determine the position of the rotor, its movement or its absence of movement. The control unit may also include a circuit for measuring the supply current. In this case, a blocking situation of the cutting blade and the motor is characterized by an electrical overconsumption of the motor.
The mower may further include a rotation sensor associated with one of a shaft of the electric drive motor of the blade and a shaft of rotation of the cutting blade, if it is distinct from the motor shaft. The rotation sensor is then connected to the engine control unit and provides a rotation signal.
The blocking situation is then characterized, for example, by an absence of a sensor rotation signal while the electric blade drive motor is supplied with energy.
Incidentally, the mower may include a mechanism for adjusting a cutting height. This is, for example, an electric cylinder, and a control unit of the cylinder. It can be set to automatically increase the cutting height during the blade launch phase or during a jam. The mechanism for adjusting the cutting height can act, for example, on the position of the mower wheels, on the position of a cutting unit relative to a mower frame or on a position in height of the mower. cutting blade relative to a mower frame. The increase in the cutting height during the blade launch phase makes it possible to remove from the cutting blade all or part of the plants possibly present under the blade or facing the blade at the time of the launching phase, and thus promote the rotation of the blade. The invention also relates to a driving method of a mower comprising an electric drive motor of at least one rotary cutting blade comprising: - at least one resting phase during which the electric motor is not powered by energy, - at least one mowing phase during which the electric motor is powered and is driven for rotation in a first direction of rotation, corresponding to a rotation of the cutting blade in a cutting direction of plants, - at least one transient blade launch phase in which the electric motor is temporarily driven for rotation in a second direction opposite the first direction of rotation.
The different phases of the process can be initiated or repeated several times. Moreover, the order of the different phases may be different from that indicated above.
The mowing phase corresponds to a rotation of the blade in one direction to cut possible plants to mow. It does not necessarily imply effective mowing of plants, nor the actual presence of plants in the cutting area of the blade.
In the manner already described, several possibilities are offered to initiate the blade launch phase. In particular: the blade launching phase can be initiated automatically when starting the electric motor, the blade launching phase can be initiated in response to a detection of a blade blocking situation when starting the blade. electric motor. the blade launching phase can be initiated in response to a detection of a blade blocking situation during the mowing phase. - The blade launch phase can be initiated in response to a command from the user.
It is considered that the blade launching phase is initiated during a start of the engine when it follows a control of powering the electric drive motor of the blade.
The detection of a blocking situation of the blade can be characterized, as previously described, by a lack of rotation of the motor and / or the blade. It can also be characterized by an abnormally low rotation speed of the engine.
Thus, and according to a particular implementation of the method, the blade launch phase can be initiated in response to the detection of a rotational speed of the electric motor in the first direction of rotation, less than a set speed.
The blade launch phase is transient in that it is not a permanent mode of operation of the mower. It is followed by the mowing phase or, in case of persistent blocking of the cutting blade, a resting phase.
The launching phase is also transient in the sense that it is preferably limited in time.
The launch phase of iame can be maintained, for example, for a period corresponding to a fraction of revolution of the cutting blade.
The blade launching phase can still be maintained for a duration corresponding to a number of revolutions of the cutting blade of between 0.5 and 5. At the end of the launching phase the method can comprise one of a resumption of the mowing phase and continuation with the mowing phase.
Moreover, the resumption of the mowing phase, respectively the continuation of the mowing phase may be conditional on a speed of rotation of the motor or the blade, during the blade launching phase, greater than a setpoint value. .
When the speed of rotation is insufficient, or in the event of a blockage, the mower can be put in the rest phase. According to another possibility, an unlocking phase comprising, in the manner already described, an alternation of rotations in the first direction of rotation and in the second direction of rotation, can also be initiated.
Finally, and as mentioned above, the blade launching phase may comprise a transient lifting of a cutting height of the mower. Other features and advantages of the invention emerge from the description which follows with reference to the figures of the drawings. This description is given for illustrative and not limiting.
Brief description of the figures
Figure 1 is a perspective of a walk-behind mower according to the invention.
Figure 2 is a partial section of the mower of Figure 1 passing through cutting blade drive shafts.
Fig. 3 is a flowchart illustrating the main aspects of a driving method of the mower.
Detailed description of modes of implementation of the invention.
Identical or similar parts of the different figures are marked with the same reference signs so that one can refer from one figure to another.
The mower of Figure 1 is a walk-behind type mower. It comprises a cutting unit 20 mounted on a frame 14. The cutting unit is connected to the frame by a parallelogram suspension not visible in Figure 1. It has a freedom of vertical movement relative to the frame 14 so as to be able to bring it closer to or away from the ground and change the cutting height. The vertical displacement of the cutting unit is provided by an electric jack mechanism 16.
An interface 18 disposed at the end of a handlebar comprises various controls and possibly a display. It allows a user to drive the mower by adjusting, if necessary, its operating parameters.
As best shown in FIG. 2, the cutting unit 20 comprises a cutting housing 22 housing two cutting blades 24a, 24b and having a mowing discharge channel 25 towards a collection bin 26 visible in FIG. 1. The cutting unit 20 also comprises a blade drive motor 30, it is an electric motor, and, in the illustrated example, a brushless type motor.
The blade drive motor 30 comprises a motor shaft 32a at the end of which is mounted one of the cutting blades 24a. A transmission system 34 with toothed wheels rotates the motor shaft 32a and a second shaft 32b on which the second cutting blade 24b is mounted. The gear set of the transmission system can be replaced by a belt drive. Thus, the two cutting blades 24a and 24b are integral in rotation with each other and rotatably connected to the drive motor 30. The cutting unit 20 finally comprises a control unit 40 of the electric motor. The control unit comprises an electronic card 42 dedicated to the management of the motor power supply from a battery 44 visible in FIG. 1. It further comprises a magnetoresistive type rotation sensor 46 disposed in the vicinity of the battery. upper end of the shaft 32 of the motor provided with a non-visible associated magnet. The rotation sensor 46 is intended to provide the control unit with information relating to the position of the rotor of the motor. By extension, the rotation sensor signal makes it possible to measure the rotation or the absence of rotation of the motor and the blades.
According to a variant, not shown, the rotation sensor can be replaced by an induction sensor measuring one or more currents induced in the motor windings by the rotation of its rotor. The signal provided by this sensor then makes it possible to estimate the position of the rotor in rotation and to measure the rotation or the absence of rotation of the blades. Other electronic boards 48 of the control unit 40 are provided for accessory functions of the control unit such as the control of electric motors for advancing the mower, the control of the electric ram 16 mentioned above or else of the interface 18.
The logic diagram of FIG. 3 illustrates the operation of the mower and in particular the control of the electric motor 30 for driving the blades.
The reference 100 of FIG. 3 corresponds to a rest phase of the electric motor 30 in which it is not powered. Engine and blades do not rotate. The rest phase 100 is occupied for example during a storage of the mower, during a decommissioning, or during a human intervention on the cutting blades, for example.
An engine start can be caused, for example, by a user action on a push button or a key switch of the interface 18 visible in Figure 1. The electric motor start marks the passage of the phase of rest 100 at a mowing phase 102 in which the electric drive motor of the blades is fed for rotation in a first direction of rotation. The first direction of rotation also corresponds to a direction of rotation of the blades adapted to the mowing. In the mowing phase, the mower can be used to mow plants and, if necessary, collect mowed plants in the grass catcher 26.
In the illustrated example, the transition from the rest phase 100 to the mowing phase 102 at the time of starting can take place in three ways.
According to a first possibility, indicated by an arrow 104, the transition from the rest phase to the mowing phase can be immediate. The cutting blades are thus activated in rotation in the cutting direction of the plants.
According to a second possibility, indicated by an arrow 106, the transition from the rest phase to the mowing phase can take place via a blade launch phase 108.
As mentioned above, the launch phase 108 is a transient phase of short duration in which the electric drive motor of the blades is fed for rotation in the second direction of rotation opposite to the first direction of rotation. The blade launching phase can be accompanied by the control of a lift 150 of the cutting unit, allowing, if necessary, to limit the cutting resistance at the cutting blades.
According to a third possibility, indicated with an arrow 110, the passage through the launching phase 108 may be conditional on a step 112 of verifying the absence of blocking of the blades. The verification takes place, for example, by supplying the electric motor for a rotation in the first direction of rotation, and checking whether the rotation sensor 46 (FIG. 2) emits a rotation signal.
In the absence of blocking, the verification step 112 is immediately followed by the mowing phase 102 as indicated by an arrow 114. In the opposite case, the verification step can be continued by the blade launch phase 108 , as indicated by the arrow 116. At the end of the blade launch phase 108, the electric motor can go directly into the mowing phase 102 as indicated by an arrow 118. The launching phase can also include, or be followed by a non-blocking check step 122 as indicated by the arrow 120. This step is comparable to the non-blocking check step 112 mentioned above.
As shown by an arrow 124, the non-blocking check step 122 of the blade launch phase 108 is followed by the mowing phase in the absence of a block.
In the opposite case, that is to say in case of blocking, the blade launch phase 108 is continued, as indicated by an arrow 126 by an unlocking step 128. The unlocking operation 128 comprises, as mentioned above, a fast sequence of power supply of the electric motor in the first and in the second direction of rotation. Unlocking amounts, in a way, to repeat several times a blade launch operation in opposite directions of rotation.
A new stage 132 for checking the absence of jamming of the blade indicated by the arrow 130 is provided at the end of the unlocking step.
When the verification step 132 makes it possible to note an unlocking, that is to say a rotation of the motor, and therefore of the blades, it is continued, as shown by the arrow 134 by the mowing phase 102. conversely, a failure of the unlocking found during the verification step 132, after a predetermined number of attempts of rotation in the opposite direction, or after a predetermined duration, is followed, as shown by the arrow 136 by a return to the phase of rest so as to allow a possible manual maintenance or unblocking of the blades. This return phase is possibly associated with the presentation of a fault signal to the user (visual signal, sound, ...)
The reference 142 indicates a possible rotation control operation which, as shown by the arrow 140, may take place during the mowing phase 102. It may be a continuous or periodic check of the rotation of the motor. blade drive or blade rotation. It is comparable to the verification steps 112, 122 and 132 mentioned above.
In the case of normal rotation, the mowing phase 102 is continued as indicated by an arrow 144.
In the event of a sudden blockage, the engine control can resume the blade launching phase 108 as indicated by an arrow 146. It may possibly be accompanied by a lifting 150 of the cutting unit.
It should be remembered that FIG. 3 illustrates only a particular possibility of controlling the drive motor of the blades.

权利要求:
Claims (18)
[1" id="c-fr-0001]
1. An electric trimmer comprising: - at least one rotary cutting blade (24a, 24b), - a rotary electric motor (30) for driving the cutting blade, - an electronic control unit (40) of the electric motor. configured to control a rotation of the electric motor in a first direction of rotation during a mowing phase (102), characterized in that the electronic control unit (40) of the electric motor (30) is further configured to drive a rotation of said electric motor in a second direction of rotation opposite the first direction of rotation, during a blade launch phase (108).
[0002]
2) A mower according to claim 1, wherein the control unit (40) is configured to detect a blade blocking situation when starting said electric motor, and to automatically initiate the blade launch phase (108) in response to a blocking situation detection.
[0003]
3) A mower according to claim 1, wherein the control unit is configured to initiate the blade launch phase automatically at each start of the electric motor.
[0004]
4) mower according to one of claims 1 or 2 wherein the control unit is configured to detect a blade blocking situation during the blade launching phase and to cause an unlocking operation (128) comprising the driving a sequence of rotations of the electric motor alternately in the first and in the second direction of rotation.
[0005]
5) A mower according to any preceding claim, wherein the control unit (40) is provided with a measuring circuit of at least one of a current induced in a winding of the electric motor and a current power supply of the electric motor (30).
[0006]
6) A mower according to any one of the preceding claims, comprising a rotation sensor (46) associated with one of a rotating shaft (32a) of the electric motor driving the cutting blade and a rotation shaft ( 32a, 32b) of the cutting blade, the rotation sensor being connected to the control unit (40) of the electric motor.
[0007]
7) mower according to one of the preceding claims, comprising an electric mechanism (16) for adjusting a cutting height.
[0008]
8) mower according to claim 1, comprising a control interface (18) connected to the engine control unit, the control interface comprising a trigger member of the blade launch phase.
[0009]
9) A driving method of a mower comprising an electric drive motor of at least one rotary cutting blade comprising: - at least one resting phase (100) during which the electric motor is not supplied with energy - At least one mowing phase (102) during which the electric motor is driven for rotation in a first direction of rotation, corresponding to a rotation of the cutting blade in a cutting direction of plants, - at least one transient blade launch phase (108), during which the electric motor is temporarily driven for rotation in a second direction opposite the first direction of rotation.
[0010]
10) The method of claim 9, wherein the blade launch phase is initiated automatically when starting the electric motor,
[0011]
11) The method of claim 10, wherein the blade launching phase is initiated in response to a detection of a blade blocking situation (114, 116) when starting the electric motor.
[0012]
The driving method according to claim 9, wherein the blade launching phase (108) is initiated in response to a detection of a blade blocking situation (142, 146) during the mowing phase.
[0013]
13) Control method according to claim 9, wherein the blade launch phase (108) is initiated in response to the detection of a rotation speed of the electric motor in the first direction of rotation, less than a set speed. .
[0014]
14) A driving method according to claim 9, wherein the blade launching phase is initiated in response to a command from the user.
[0015]
15) A driving method according to any one of claims 9 to 14, wherein the blade launching phase (108) is maintained for a period corresponding to a fraction of revolution of the cutting blade.
[0016]
16) A driving method according to any one of claims 9 to 14, wherein the blade launching phase (108) is maintained for a duration corresponding to a number of revolutions of the cutting blade of between 0.5 and 5. .
[0017]
17) Control method according to claim 9 to 16, wherein a restart of the mowing phase, respectively a continuation of the mowing phase at the end of the blade launch phase (108) is conditional on a speed rotation of the motor during the blade launch phase, greater than a set value.
[0018]
18) Method according to one of claims 9 to 17, wherein the blade launching phase (108) comprises a transient lift of a cutting height of the mower.

类似技术:

---

公开号 | 公开日 | 专利标题

---

EP3393229B1|2019-10-02|Electric mower with automatic blade unblocking and method for controlling the mower

---

CN101238772B|2014-03-19|A load-responsive energy-saving motor-driven grass mower

---

EP1703829B1|2008-09-03|Electric household food preparation appliance which is designed to be on standby and reactive

---

EP2703292B1|2016-09-28|Method for assisting a pilot of a single-drive rotary wing aircraft during a phase of autorotation

---

EP3393228B1|2019-10-02|Anticipative electric mower and method of piloting such a mower

---

US7669393B2|2010-03-02|Stall detection system for mower blade clutch engagement

---

EP2835045A1|2015-02-11|Vegetation cutting device

---

EP2702850B1|2015-10-28|Electric lawn tractor power management system and method

---

EP2272317B1|2013-03-27|System to clear stuck reels on grass mowing machine and grass mowing machine

---

US9730383B2|2017-08-15|Slip controlling belt tension system

---

EP3414984B1|2021-01-20|Electric walk behind greens mower

---

FR2962770A1|2012-01-20|Method for controlling automatic restarting of heat engine e.g. diesel engine, of motor vehicle i.e. car, by reversible alternator, involves repeating activation of reversible alternator in event of failure of restarting

---

EP0970600A2|2000-01-12|Distributor for forage and similar animal feedstuff

---

US10856465B2|2020-12-08|Systems and methods for inhibiting implement-induced engine stall, and turf maintenance vehicles incorporating same

---

EP2863049A1|2015-04-22|Device for automatic stopping and restarting of an internal combustion engine of a motor vehicle

---

EP3334270B1|2019-11-27|Electric lawn mower with electromagnetic parking break

---

EP1466666A2|2004-10-13|Garden shredder

---

JPH0717814Y2|1995-04-26|Engine starting safety device for mobile agricultural machinery

---

FR3067068A1|2018-12-07|WIND MACHINE HAVING A CONTROL UNIT PROVIDING REGULATION OF THE ROTATION SPEED OF THE ROTOR

---

FR2880543A1|2006-07-14|Fire engine or fire pump for extinguishing fire, has alarm device activated by detection unit when cavitation phenomenon of centrifugal pump is identified to allow operator or control unit to intervene on operation parameters of pump

同族专利:

---

公开号 | 公开日

---

EP3393229B1|2019-10-02|

---

JP2019506149A|2019-03-07|

---

CN108430210B|2021-07-06|

---

EP3393229A1|2018-10-31|

---

CN108430210A|2018-08-21|

---

BR112018010881A2|2018-11-21|

---

WO2017109319A1|2017-06-29|

---

FR3046024B1|2018-05-18|

---

US20180310471A1|2018-11-01|

---

KR20180096774A|2018-08-29|

引用文献:

---

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

---

GB2199226A|1986-12-29|1988-07-06|Kubota Ltd|Cutter-trimmer of the walk-behind type|

---

EP1969919A1|2007-03-14|2008-09-17|Robert Bosch Gmbh|Cutting tools|

---

US7797915B1|2009-07-08|2010-09-21|Deere & Company|System to clear stuck reels on grass mowing machine|

---

US2597735A|1946-09-13|1952-05-20|Sunbeam Corp|Lawn mower|

---

US2979879A|1958-06-25|1961-04-18|Joe C Reynolds|Reel mower with mulching means|

---

US4306402A|1978-05-24|1981-12-22|Ahi Whimpway Limited|Gang mowers|

---

FR2939008B1|2008-12-01|2011-06-24|Pellenc Sa|MOTORIZED SIZE SELF-DECOATING APPARATUS, IN PARTICULAR HEDGE TRIMMER|

---

CN201905046U|2010-12-06|2011-07-27|全栋太阳能光伏有限公司|Plastic belt disc mower with battery terminal protecting device|

---

JP6130153B2|2013-01-31|2017-05-17|株式会社マキタ|Brush cutter|

---

WO2016197120A1|2015-06-05|2016-12-08|Mtd Products Inc|Walk-behind mower with steering wheel control|US10687464B2|2017-01-12|2020-06-23|Briggs & Stratton Corporation|Zero turn radius mower controls|

---

EP3747252A4|2018-03-09|2021-03-03|Honda Motor Co., Ltd.|Work machine|

---

CN110506492A|2019-06-05|2019-11-29|丰疆智能科技研究院有限公司|Agriculture diced system, hydraulic module and agriculture cutting method|

法律状态:
2016-12-02| PLFP| Fee payment|Year of fee payment: 2 |

---

2017-06-30| PLSC| Publication of the preliminary search report|Effective date: 20170630 |

---

2017-12-27| PLFP| Fee payment|Year of fee payment: 3 |

---

2019-12-26| PLFP| Fee payment|Year of fee payment: 5 |

---

2020-12-27| PLFP| Fee payment|Year of fee payment: 6 |

---

2021-12-27| PLFP| Fee payment|Year of fee payment: 7 |

优先权:

---

申请号 | 申请日 | 专利标题

---

FR1563189|2015-12-23|

---

FR1563189A|FR3046024B1|2015-12-23|2015-12-23|ELECTRIC MOWER WITH AUTOMATIC BLADE RELEASE AND METHOD FOR CONTROLLING THE MOWER.|FR1563189A| FR3046024B1|2015-12-23|2015-12-23|ELECTRIC MOWER WITH AUTOMATIC BLADE RELEASE AND METHOD FOR CONTROLLING THE MOWER.|

---

CN201680075556.4A| CN108430210B|2015-12-23|2016-12-06|Electric lawn mower with automatic blade unplugging and method of controlling the same|

---

JP2018533255A| JP2019506149A|2015-12-23|2016-12-06|Electric mower with automatic deblocking of blade and control method of mower|

---

EP16825804.4A| EP3393229B1|2015-12-23|2016-12-06|Electric mower with automatic blade unblocking and method for controlling the mower|

---

BR112018010881-2A| BR112018010881A2|2015-12-23|2016-12-06|electric lawn mower with automatic blade release and lawn mower control method|

---

PCT/FR2016/053228| WO2017109319A1|2015-12-23|2016-12-06|Electric mower with automatic blade unblocking and method for controlling the mower|

---

KR1020187021273A| KR20180096774A|2015-12-23|2016-12-06|Electric lawn mower with automatic blade clogging function and control method of such lawn mower|

---

US15/770,318| US20180310471A1|2015-12-23|2016-12-06|Electric mower with automatic blade unblocking and method for controlling the mower|