WO2020126731A1 - Dispositif d'affichage pour un véhicule électrique - Google Patents

Dispositif d'affichage pour un véhicule électrique Download PDF

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Publication number
WO2020126731A1
WO2020126731A1 PCT/EP2019/084592 EP2019084592W WO2020126731A1 WO 2020126731 A1 WO2020126731 A1 WO 2020126731A1 EP 2019084592 W EP2019084592 W EP 2019084592W WO 2020126731 A1 WO2020126731 A1 WO 2020126731A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
temperature
designed
light
display device
Prior art date
Application number
PCT/EP2019/084592
Other languages
German (de)
English (en)
Inventor
Marcin Rejman
Mickael Segret
Christoph Klee
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2020126731A1 publication Critical patent/WO2020126731A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the invention relates to a display device for a power tool. Furthermore, the invention relates to a power tool or an accessory for such a power tool with a corresponding display device.
  • Power tools and accessories for such power tools are often equipped with light indicators.
  • the state of charge or an operating state is indicated by means of LEDs on the battery or directly on the power tool.
  • Light intensity of a light display also depends on the external one
  • Lighting situation For example, a light indicator that is easily recognizable in low ambient lighting is less easy to recognize for the user in the case of relatively strong lighting from the sun or artificial light.
  • a light display with strong intensity which it with strong
  • Ambient lighting can cause glare to the user.
  • a display device for a power tool which has a light display with at least one LED, a
  • Control device for controlling the light display and a light sensor designed to detect the ambient brightness.
  • the control device is designed to control the luminosity of the luminous display in
  • Luminosity of the contrast between illuminated and non-illuminated elements of the illuminated display which is typically reduced in the case of particularly strong ambient lighting, is increased.
  • a reduction in the luminosity reduces the glare that typically occurs in particularly weak ambient lighting and thus increases the resolution of the illuminated display that can be perceived by the user.
  • dimly lit environment can be avoided and at the same time
  • the light display comprises an at least partially transparent window structure, the LED and the light sensor being arranged together behind the window structure. This arrangement of the light sensor enables an optimal measurement of the
  • control device is designed to deactivate the LED for a short period of time at defined time intervals and to detect the ambient brightness by means of the light sensor during the time in which the LED is deactivated. This effectively prevents the measurement of the ambient brightness using the light sensor from being falsified by the light from the adjacent LED.
  • control device is designed to control the LED using a control signal modulated by means of pulse width modulation. Furthermore, the control device is designed to detect the ambient brightness by means of the light sensor in a switch-off phase
  • Pulse width modulation to record modulated control signal.
  • Using the switch-off phases of pulse width modulation enables a particularly simple measurement of the ambient brightness.
  • the LED is designed to emit light radiation with at least one defined wavelength.
  • the light sensor has a reduced sensitivity for the at least one wavelength of the light radiation emitted by the LED. This measure enables the ambient brightness to be measured independently of the control of the LED.
  • the LED has a luminous intensity which varies with the temperature.
  • the control device is designed to determine the temperature of the LED with the aid of a temperature sensor and to compensate for a temperature-dependent change in the luminous intensity on the basis of the determined temperature. As a result, temperature-related luminous intensity variations can be largely compensated for.
  • Temperature sensor is used.
  • the control device is designed to detect a temperature-dependent forward voltage of the LED and to determine the temperature of the LED by evaluating the detected forward voltage. This measure can be used on a separate temperature sensor to be dispensed with. At the same time, the use of the LED enables
  • Temperature sensor a particularly precise determination of the temperature of the LED.
  • control device is designed to determine the temperature determined using the bias of the LED
  • Temperature sensor which is arranged for example in the power tool or in the corresponding accessory, has a defect. This increases the operational safety of the power tool or the corresponding accessory.
  • the light display is in the form of a charge status display. Is often arranged in the immediate field of vision of the user an improvement in the illuminated display thus increases the ease of use of the power tool or the corresponding accessory.
  • Fig. 1 shows schematically a battery-operated power tool with a
  • Fig. 2 schematically shows a battery-operated power tool with a
  • Fig. 3 is a block diagram of the display device
  • FIG. 5 shows a digital control circuit implemented by means of a microcontroller for
  • 6 shows an analog control circuit for controlling an LED light indicator
  • 7 shows the digital control circuit from FIG. 5 with a temperature sensor
  • FIG. 8 shows the digital control circuit from FIG. 7, in which the LED is used as an additional temperature sensor.
  • FIG. 1 shows a schematic representation of a means of a
  • Exchangeable batteries 300 powered electric tool 200 which is designed in the present embodiment in the form of a cordless screwdriver.
  • a power tool 200 generally has at least one light indicator 110 for displaying certain information in the
  • Connection with the operation of the power tool 200 include, for example, the current operating state or operating mode of the
  • Power tool 200 or a power tool accessory 300 as well as other information of interest to the user, such as, for example, the currently set speed or the current charge status, the currently set gear, the current direction of rotation, the current device temperature, etc.
  • Such light indicators 110 which are generally realized with the aid of light-emitting diodes (LED) 111, 112, 113, 114, 115, are typically arranged on the housing 210 of the power tool 200 or on the housing 310 of the rechargeable battery 300 in a manner that is clearly visible to the user. In the case of the power tool 200 shown in FIG. 1, the light indicator 110 is in an upper part of the LED
  • Power tool housing 210 arranged and in the form of a
  • Charging status display is formed, which comprises a plurality of light-emitting diodes 111 to 115 each forming individual LED segments. For reasons of clarity, only the first and the last LED 111, 115 have been provided with a reference symbol.
  • the individual LEDs 111 to 115 are generally mounted on a printed circuit board in a spatially separated manner and are visible through a transparent window structure 116 formed in the housing 210.
  • the transparent window structure 116 can be designed in the form of a transparent cover or in the form of a light-guiding element and, depending on the particular design, can be designed as a separate window structure for individual LEDs 111 to 115 or as a common window structure for all LEDs 111 to 115.
  • the transparent window structure 116 can also be diffuse be formed so that an LED 111 to 115 arranged behind the window structure 116 appears to be areally illuminated to the viewer.
  • the illuminated display 110 forms part of a display device 100 housed in the power tool housing 210, which also further comprises a control device 120 for controlling the illuminated display 110.
  • the lighting device 100 also includes one
  • the control device 120 is designed to determine the brightness of the surroundings of the power tool 200 using the light sensor 140, which is preferably arranged in the immediate vicinity of the light display 110, and to determine the brightness of the display or
  • Illuminated display 110 increased at a high measured ambient brightness in order to increase the contrast between illuminated and non-illuminated elements and thus to improve the readability. If, on the other hand, a low ambient brightness is measured, the control device 120 reduces it
  • Luminosity of the light display 110 in order to avoid glare to the user in dimly lit surroundings.
  • FIG. 2 shows an alternative embodiment in which the
  • Lighting device 100 with the light indicator 110 is arranged inside the housing 310 of the battery 300 serving as an accessory for the electrical device 200.
  • a lighting device 100 can also be provided on other accessories of the power tool 200, such as a charger, which is only temporarily connected to the power tool 200 or the battery 300.
  • FIG. 3 shows a simplified illustration of the electrical device 200 from FIG. 1.
  • the electrical device 200 shown here as a block diagram includes the
  • Display device 100 with the light indicator 110 arranged in a housing opening of the electrical device 200 and the control device 120 arranged in the housing of the electrical device 200.
  • the light indicator 110 comprises a total of five LEDs or LED segments 111 to 115, which are arranged behind a common transparent window structure 116.
  • the light sensor 140 is arranged in the immediate vicinity of the first LED 111, so that it looks through the transparent window structure 116 together with the LEDs 111 to 115.
  • the arrangement of the light sensor 140 in the immediate vicinity of the illuminated display 110 enables a particularly precise measurement of the ambient brightness, which is necessary for a corresponding adjustment of the luminous intensity of the illuminated display 110. Furthermore, no additional cover for the light sensor 140 is required in this construction.
  • the light indicator 110 and the associated lighting device 100 can also be arranged on an accessory 300 of the electrical device 200.
  • Such an alternative arrangement of the lighting device 100 within a battery pack 300 serving as an accessory is shown in FIG.
  • the lighting device 100 also has a
  • Charge status indicator light indicator 110 which comprises five separate LEDs 111-115.
  • the individual LEDs 111-115 of the light display 110 shown here each have separate window structures 116.
  • the additional light sensor 140 is located directly next to the first LED 111 arranged so that the light sensor 140 and the first LED 111 use a common window structure 116.
  • control device 120 comprises a special control circuit 121 for controlling the illuminated display 110 or the individual LEDs 111-115.
  • the digital or analog control circuit 121 is designed to detect the ambient brightness with the aid of the light sensor 140 and to adapt the luminosity of the light segments 111 to 115 as a function of the detected ambient brightness.
  • Various methods are possible to control the brightness of an LED 111 to 115.
  • the LED can be controlled using a pulse-width-modulated signal, by means of which the LEDs are repeatedly switched on and off at relatively short time intervals.
  • the ratio of the duration of the on and off phases determines the current brightness of the LEDs. For example, an extension of the switch-off phases and / or a
  • Control circuit 121 which is implemented, for example, with the aid of a microcontroller, vary the supply voltage of the LEDs with the aid of a suitable circuit in order to adjust the luminosity of the illuminated display 110 in
  • FIG. 5 shows an example of a digitally implemented control circuit 121 as part of the control device 120.
  • the control circuit 121 comprises one
  • Microcontroller 123 for controlling an LED 111.
  • the LED 111 is connected via a series resistor 153 to an output PB5 of the microcontroller 123.
  • the control circuit 121 further comprises a light sensor 140 in the form of a phototransistor, which is connected in series with an electrical resistor 152.
  • the microcontroller 123 detects at its signal input PA3 the electrical potential of one arranged between the phototransistor 140 and the electrical resistor 152
  • the microcontroller 121 is designed to change the electrical potential at its
  • Control circuit 122 comprises an operational amplifier 124 which is connected to the cathode of LED 111 via a resistor 155.
  • the analog control circuit 122 further comprises a light sensor in the form of a phototransistor 140.
  • the phototransistor 140 designed as an npn bipolar transistor is connected with its collector to a node 160 arranged between the anode of the LED 111 and a voltage source 170 and with its emitter via an electrical resistor 156 to the negative supply voltage GND.
  • the control circuit 121 If the light sensor 140 is positioned directly next to an LED 111 of the illuminated display 110, as is the case for example in the exemplary embodiments shown in FIGS. 3 and 4, there is basically the risk that the light sensor 140 will also emit that emitted by the LED 111 in addition to the ambient light Light is captured and the measurement of the ambient brightness is falsified. To prevent this, the control circuit 121
  • the control circuit 121 can also be designed to briefly interrupt the operation of the LEDs 111-115 in order to evaluate the brightness sensor during this time and then to adjust the brightness of the display accordingly. For such an interruption, a very short period of time is preferably used, which is imperceptible to the human eye, e.g. B. shorter than 10 ms.
  • This embodiment is particularly useful in connection with a digital control circuit 121, since the LEDs are usually controlled by means of pulse width modulation. Accordingly, the ambient brightness is recorded in the switch-off phases of the pulse-width-modulated control signal. If a brief interruption of the lighting operation of the LEDs 111-115 is not desired or can only be implemented with great difficulty, which is usually the case when using an analog control circuit 122 for controlling the LEDs, the
  • a special light sensor 140 can also be used, which has a reduced sensitivity to light radiation with the wavelength emitted by the LEDs 111-115.
  • wavelength selectivity can also be any wavelength selectivity.
  • wavelength selectivity can also be any wavelength selectivity.
  • suitable optical filter which is arranged in front of the light sensor 140.
  • Brightness sensors are used. However, when using it simple and inexpensive brightness sensors, such as
  • Phototransistors disadvantageous that the corresponding sensor signal fluctuates very strongly with the temperature. In order to reduce the associated measurement inaccuracy, it makes sense for the control device 120 to detect the temperature of the light sensor 140 and thus the temperature-related variation of the
  • FIG. 7 shows a control circuit 121 equipped with a corresponding temperature sensor 151 to compensate for the temperature dependence of the light sensor 140, which is designed essentially analogously to the control circuit from FIG. 5.
  • the in the present example in the form of a thermistor or
  • Thermistors with a negative temperature coefficient (NTC), temperature sensor 151, are connected in series with a further electrical resistor 154.
  • the microcontroller 123 detects the electrical potential of a at its signal input PB5
  • Node 158 between the two resistors 151, 154 Due to the negative temperature coefficient of the temperature sensor 151, its ohmic resistance is reduced when the temperature rises, which has the result of a reduction in the electrical potential measured by the microcontroller 123 at its signal input PB4. On the other hand, a reduction in the temperature leads to an increase in the ohmic resistance of the temperature sensor 151, which is accompanied by an increase in the electrical potential determined by the microcontroller 123 at its signal input 11.
  • an improvement in the temperature compensation can be achieved by measuring the temperature of the light sensor 140 as directly as possible, which can be achieved, for example, by arranging the temperature sensor 150 in the immediate vicinity of the light sensor 140. If the light sensor 140, such as In the exemplary embodiment shown in FIG. 3, which is arranged directly next to an LED 111, this LED 111 can also be used as a temperature sensor 150. This takes advantage of the fact that the forward voltage of LED 111 is also strongly temperature-dependent. For this purpose, the relevant LED 111 is put into a known working state, for example in which a defined or at least known current is fed into the LED 111. The control device 120 then determines the forward voltage of the respective LED 111. The control device 120 can determine the current temperature of the relevant LED 111 from the measured forward voltage.
  • the control device 120 can roughly determine the temperature of the light sensor 140 in this way.
  • a correspondingly designed digital control circuit 121 is shown in FIG. 8. It can be seen that the microcontroller 123, with its signal input PC6, detects the electrical potential of a node 159 arranged between the LED 111 and the series resistor 153. In this arrangement, a change in the forward voltage of the LED 111 caused by an increase in the temperature leads to a measurable change in the electrical potential at the signal input 16 of the microcontroller 123.
  • this type of temperature measurement using LEDs 111-115 can also be used to measure the measured values of other temperature sensors
  • Electrical device 150 to make plausibility They give way by means of the respective
  • Temperature sensor measured temperature and the temperature determined using the LEDs 111-115 strongly differ from each other, a control device of the electrical device 200 or the respective accessory 300 can recognize that a temperature measurement is unreliable. From this, the control device can derive, for example, the operation of the electrical device 200 or the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un dispositif d'affichage (100) pour un véhicule électrique (200), comprenant un voyant lumineux (110) pourvu d'au moins une DEL (111, 112, 113, 114, 115), un système de commande (120) servant à commander le voyant lumineux (110) et un capteur de lumière (140) réalisé pour détecter la luminosité ambiante. Le système de commande (120) est réalisé pour commander l'intensité lumineuse du voyant lumineux (110) en fonction de la luminosité ambiante détectée à l'aide du capteur de lumière (140).
PCT/EP2019/084592 2018-12-20 2019-12-11 Dispositif d'affichage pour un véhicule électrique WO2020126731A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018222485.4A DE102018222485A1 (de) 2018-12-20 2018-12-20 Anzeigevorrichtung für ein Elektrowerkzeug
DE102018222485.4 2018-12-20

Publications (1)

Publication Number Publication Date
WO2020126731A1 true WO2020126731A1 (fr) 2020-06-25

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Application Number Title Priority Date Filing Date
PCT/EP2019/084592 WO2020126731A1 (fr) 2018-12-20 2019-12-11 Dispositif d'affichage pour un véhicule électrique

Country Status (2)

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DE (1) DE102018222485A1 (fr)
WO (1) WO2020126731A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022213034A1 (de) 2022-12-02 2024-06-13 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1072842A2 (fr) * 1999-07-30 2001-01-31 Makita Corporation Outils à moteur avec dispositifs d' éclairage
DE10215871C1 (de) * 2002-04-11 2003-10-30 Laser Optoelektronik Gmbh Z Projektionsvorrichtung
US20110109093A1 (en) * 2006-10-30 2011-05-12 Leininger Jon J Tool having integrated electricity generator with external stator and power conditioner
EP2572834A1 (fr) * 2011-09-26 2013-03-27 Makita Corporation Outil électrique
DE102014226025A1 (de) * 2014-12-16 2016-06-16 Robert Bosch Gmbh Optische Anzeigevorrichtungseinheit zur Verwendung in einer externen Anwendungseinheit
DE102014226051A1 (de) * 2014-12-16 2016-06-16 Robert Bosch Gmbh System mit mindestens einem HMI Modul
US20160342142A1 (en) * 2014-01-27 2016-11-24 Robert Bosch Gmbh Machine Tool Device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140284070A1 (en) * 2012-06-08 2014-09-25 Black & Decker Inc. Operating mode indicator for a power tool
DE102012211354A1 (de) * 2012-06-29 2014-01-02 Robert Bosch Gmbh Hand-Werkzeugmaschine
DE102012211580A1 (de) * 2012-07-04 2014-01-09 Robert Bosch Gmbh Hand-Werkzeugmaschine und Verfahren zum Betrieb einer Hand-Werkzeugmaschine
DE102015218447A1 (de) * 2014-12-16 2016-06-16 Robert Bosch Gmbh Akkupack für eine Handwerkzeugmaschine
US20160226278A1 (en) * 2015-02-02 2016-08-04 Black & Decker Inc. Power tool battery pack and system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1072842A2 (fr) * 1999-07-30 2001-01-31 Makita Corporation Outils à moteur avec dispositifs d' éclairage
DE10215871C1 (de) * 2002-04-11 2003-10-30 Laser Optoelektronik Gmbh Z Projektionsvorrichtung
US20110109093A1 (en) * 2006-10-30 2011-05-12 Leininger Jon J Tool having integrated electricity generator with external stator and power conditioner
EP2572834A1 (fr) * 2011-09-26 2013-03-27 Makita Corporation Outil électrique
US20160342142A1 (en) * 2014-01-27 2016-11-24 Robert Bosch Gmbh Machine Tool Device
DE102014226025A1 (de) * 2014-12-16 2016-06-16 Robert Bosch Gmbh Optische Anzeigevorrichtungseinheit zur Verwendung in einer externen Anwendungseinheit
DE102014226051A1 (de) * 2014-12-16 2016-06-16 Robert Bosch Gmbh System mit mindestens einem HMI Modul

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