BG2830U1 - Controllable led lighting system for railway vehicles - Google Patents

Abstract

The present utility model relates to a controllable LED lighting system for railway vehicles and can find application in light industry for manufacturing of ceiling and wall lighting fittings related to design, construction / installation and operation on / in railway vehicles, including. passenger wagons, compartments, corridors and service spaces. The controllable LED lighting system comprises a LED module (A), a light intensity controller and a power source, and the controller comprises a start-control unit (B) and an individual control system (15), wherein the start-control unit (B) is powered by a power source in the form of a central wagon board (E) and is connected together with the LED module (A) in a single illuminator. The system is energy-saving with optimized and reduced operating costs per unit wagon, and it achieves reduced energy consumption through individual power supply for each lamp as well as central lighting control in the wagon as additionally and locally for every passenger compartment. At the same time, it brings together functions that are necessary for the passenger comfort in the compartment / emergency brake; lighting control and audible control/ and helps to easily find and use the said functions even under stressful situations. The system, according to the current utility model, allows the illuminator to operate as an independent system, even in the absence of control from the central wagon board, and takes measures to keep the wagon battery in emergency situations by smart distributing of the remaining energy in the batteries and provides longer time of normal lighting in the wagon as subsequently reflects the desire for light of the passengers in the compartment.

Description

Technical field

The utility model relates to a controlled LED lighting system for rail vehicles and a method for controlling it and may find application in lighting in the manufacture of ceiling and wall interior lighting fixtures related to the design, construction and operation of railway vehicles, in item. hours coaches, compartments, corridors and service premises.

BACKGROUND OF THE INVENTION

Essential for passenger comfort in vehicles, incl. and in the case of railways, especially those with longer journey times, there is good illumination to ensure greater visibility when traveling and when leaving the vehicle safely in the event of an emergency. At the same time, it is also important to promote energy savings in this type of electric transport and to conserve environmental resources.

The main structural elements of LEDs (EEE) for lighting systems for railway vehicles, incl. in the wagon and emergency lighting are LED module and control module. With many of the existing technological solutions, the wagon and emergency lighting is divided into two independent and separately powered light sources based on central and autonomous lighting control.

EP 27900471 is known for a lighting system coupled to a power source comprising: lighting modules, a master controller, further comprising a secondary controller, external batteries, and emergency batteries. Each of the described light modules comprising light-emitting diodes (EOE3) is end-to-end connected to form a line with a first line end and a second line end. The master controller is electrically connected to the end of the first line and controls the intensity of the EOE by sending the first and second modulating signal to the LED modules. The first modulating signal corresponds to the intensity of the first EEE and the second to the intensity of the second EEE, where the first modulating signal is sent when the main controller reports the presence of an energy source and the second modulating signal is sent when the main controller reports the absence of an energy source. The secondary controller is electrically connected to the end of the second line and to the power source. These controllers control the modes: by generating appropriate control modulated signals, in the presence or absence of the corresponding control signals of energy respectively from the energy source and / or from external batteries and / or emergency batteries.

This type of system is complicated to implement. It uses a central power supply unit in which its control is centrally implemented, where the lighting control is carried out centrally and autonomously using available external light sensors and a central command. This system also uses the PMU from the central control panel for illumination modes, which in turn causes a change in the wagon installation. In turn, the transmission of RAUM over long cables generates EMC (electromagnetic interference) and this leads to conditions for disturbing the signals of other operating systems in the wagon, such as the anti-lock braking system, or interfering with other electronic devices such as a pacemaker. The system in its form, including its attachment, has a relatively high value. The known technology used in EP 27900471 applies a minimum supply voltage of 220U AC, which in the fall-off central power mode is implemented with a 24 V to 220V inverter system. Such a system brings additional conversion losses and increases the risk of insulation breakage in the cable installation. Such a breakthrough most often causes fires. Also, this system does not allow the monitoring of the supply voltage from the batteries of the wagon and in this way the energy consumption is excessive and uneconomical. This system also lacks the ability to individually control the light intensity of passengers, in the event of an emergency the system shuts off most illuminators and thus reduces the illumination for passengers and crew in critical panic situations and does not provide

2830 υι system for controlling the energy consumption of batteries, with batteries being local only in emergency lighting.

Given the prior art in the art in question, the utility of the utility model is to provide a new simplified, easy to control and maintain design of an LED lighting system for attachment to the interior of rail vehicles that provides centrality with priority and local control of the intensity of illumination in the passenger compartment by the railway system, with centralized power supply and an individual intuitive start-up control unit for each luminaire while providing optimum illumination of spaces in the car and reduced power consumption in operational mode and emergency mode and achieves effective electrical characteristics required with guaranteed reliability and safety.

The technical nature of the utility model

The task of the present utility model is solved by means of a controlled LED lighting system for railway vehicles consisting of: an LED module, a light intensity controller and a power source, where the LED module includes an outer housing - a base with a light aperture and mounting holes to which on one side, a profile for the LED matrix is attached via the mounting system, with caps at the two ends positioned inside, with ΙΈϋ the matrix having a counter position a diffusion matrix and an angle of 100 to 150 ° at its two ends reflectors positioned on the outer housing base, and the controller includes a start-up unit and an individual control system where the start-up unit is powered by a source cable of power supply in the form of a central wagon board and connected together with the LED module in one illuminator, secured on the other side of the housing base by means of a polymeric dust adhesive on the back of the profile for the LED matrix by means of an axis ignition elements with mounting bolts and polymer glass and is equipped with a power control system and a pulse regulator. Where the individual control system is powered by a center wagon and connected to the luminaire, incorporating an electronic control unit connected to the audible alarm system in the compartment and a compartment panel to which soft-touch buttons have been implemented, with light bar indicators illuminated in the existing compartment panel in the form of a vehicle emergency brake sign.

The individual control system controls the illumination of at least one illuminator and the audible alarm system in the passenger compartment. The coupe panel is equipped with a processor system and is connected by a wiring harness to the electronic control unit, which is equipped with an adapter for the generated control signal for the lamps in the passenger compartment, an audio amplifier and a power supply unit for the control panel and the amplifier controlling the brightness and volume. in the passenger compartment. The electronic control unit, the adapter, the sound amplifier and the power supply for the control panel in the passenger compartment are housed in a metal housing secured to the service niches of the wagon by bolts and connected via a wiring harness to a control panel controlling the light and volume of the compartment, as and to the electrical installation of the body through which it controls the lighting and speakers in the body. The coupe panel is made of polymeric materials in the form of a sandwich panel incorporating soft keys illuminated in the vehicle's existing emergency brake control panel to control the lighting and the audible alarm system in the passenger compartment with two bars the indicator by which the instantaneous settings of the controlled systems are visualized, all this is controlled by a processor system in the panel that produces and sends the control signals to the horse the trolley block and through it and to the lighting in the passenger compartment. The panel is secured to the interior wall panel of the passenger compartment at the designated location according to the wagon structure.

The base of the housing may be made of rolled carbon steel with a polymer powder coating with mounting holes and a center-mounted light aperture to which a fastening system (bolt, brackets) is welded prior to the application of the protective coating. Subsequently through them and

2830 υι polymer dustproof adhesive is attached profile for LED matrix.

The polymer glass is secured by adhesive materials together with the anchorage securing elements, double securing the glass position, if for some reason the adhesive layer breaks and mounting bolts, passing through them and through the base, holding them in place in the interior space. of the illuminator. The polymer glass protects against dust and other contaminants from the light-emitting system, as well as from mechanical damage.

The LED matrix profile can be made of extruded or extruded or sintered aluminum, copper, zinc, tzam, designed to allow the elements of the LED matrix, reflectors, diffusion matrix and profile caps to be secured to it. Provides a normal temperature mode of the LED matrix, giving off the released heat during its operation to the environment.

The YELL matrix is made up of PCBs (PCBs) on which LEDs are soldered.

The WEEE reflectors are made of mirror aluminum or a polymer mirror and are fixed to the profile by crimping offset from the central vector of the 100-150 ° matrix illumination.

The diffusion matrix is made of a polymeric material with a special coating, providing a high degree of diffusion of light at low losses from its passage, positioned on the profile in specially designed channels and is crimped to achieve mechanical fixation and closure of the space of the ELD matrix. from the outside atmosphere, protecting it from dust.

The anchorage securing elements are made of polypropylene and provide additional fixation of the polymer glass to the base of the housing by collectively attaching to the ceiling of the wagon interior by mounting bolts, the anchor element cover hiding the bolts from direct visibility and providing protection against unwanted and unauthorized demon of the illuminator.

The start-up unit, together with its mounting bolts, provides monitoring of the supply voltage from the vehicle's batteries. This function reduces energy consumption when, due to damage or other circumstances, the wagon is left without external power and the batteries are in the process of depletion. In the case of exhausted wagon batteries, the lamp automatically goes into emergency mode, reducing its total consumption to a minimum of 3Ψ. This function provides longer illuminated time for the withdrawal of passengers from the wagon. It provides the switching of at least two modes of power consumption from the central wagon panel, thus preserving the functionality of the luminaire even when mounted in wagons that are only centrally controlled by the lighting. The actuator control unit is connected externally to the central wagon board with the supply voltage from the wagon batteries and the control signal from the passenger compartment panel, as well as to the LED matrix of the LED module through the contacts of the four-wire couplings (L. 1 - L. 4), connected respectively, with a plug duplicated on the circuit board (L. 1 - L. 4) to the next luminaire, where the plug (L. 1) of the plugs is connected to pin 2 of diode Ό2 on one side and respectively by pin 1 of diode Ό2 connects to resistor K.4 / 1, cat o the reverse diode L4 / 1 and the transfer diode L 1/2 are connected in the same place, with the diode L 1/1 connecting on the other side to the intermediate connection coming from the contact of the plug L. 2 and the diode L3 connecting to the current-determining resistor K5 / 1, current-defining resistor K.7 / 2, capacitor C2 / 1, together with the feeder leg 4 of the impulse regulator and 1-16, at the same time resistors K4 / 2 and K.5 / 2 on the other side are connected to each other and with the LEL matrix 6 constructed by the LEDs L5, L6, L7, L8, L9 and L10, as well as with the pulse controller 1L / 3 8ΕΝ8Ε, and the diode array from the other with and the side is connected to the inductor b1 / 2, the converting inductor b1 / 1 is connected to diode L4 / 2 and is fed from the output of the transistor key contact 13 \ Y of the pulse regulator υΐ - 16, where the pulse regulator Sh is in turn through contact leg of the chip 2ΟΝΠ, together with capacitor C2 / 2, resistor K.2 / 1, diode L12 / 2 are connected to the ground of the circuit, which

2830 υι enters through terminal L .4 of the couplings, where resistor K7 / 1 is connected to diode 011/1 and it in turn connects to diode ϋ12 / 2 and resistor K.6 / 1, which is connected from side 2 with input of the control circuit of the impulse regulator 1L / 7 (Αϋΐ), resistors K.2 / 2 and K1 / 1 connected to its contact 2 with the impulse regulator foot plus the chip and 1/8 (UEU), simultaneously the impulse regulator υΐ -16 is connected to the capacitor C1 / 1 by means of contact compensating circuit, foot 5 (COMP), and is connected to ground on the other side, connected to resistor K.3 / 1 through terminal L. 3 and hence res. history K.3 / 2 connects to the input of the pulse width modulation and 1/6 (AURM) to receive the control signal from the panel into the passenger compartment.

According to another variant embodiment of the controlled LED lighting system, the starting-control unit for the modes of power consumption from the central wagon board are two, respectively, from 0-90% and 100%.

According to a further embodiment of the actuator-control unit, the inlet lines L. 1 L .3 are soldered with additional elements providing overvoltage protection at the inlet lines.

According to another further variant embodiment of the controlled LED system, according to the present utility model, the individual control system may also be connected to another illuminator capable of P \ ¥ M control, insofar as the sound system is implemented in and within the individual control system. performs work and control.

The controlled LED lighting system has the design and operational advantages of this utility model, which are expressed in the following: the system provides control of the energy consumption depending on the fall of the batteries by controlling the supply voltage from the batteries of the wagon and thus reducing energy consumption in situations without external power, the batteries are in the process of depletion. In the case of worn out battery packs, the luminaire automatically goes into emergency mode, reducing its total consumption to min 3 \ Y and providing long illumination time in an emergency. The system is energy efficient overall, achieving reduced energy consumption through the individual power supplies for each luminaire, as well as the central control of the luminaires in the wagon and additionally locally for each passenger compartment. Additionally, this system avoids flashes or vibrations due to changes in the central supply of the wagon. At the same time, the implementation of the control unit panel in the nameplate for the use of the wagon's emergency brake combines, at one place, the functions necessary for passenger comfort (emergency brake), lighting control and sound control, and second, facilitates easy finding and using the same features even in stressful situations. When transmitting the control signal from the panel to the luminaires, ΡΨΜ is used, where the signal-carrying cable has a length not exceeding 2 t and ends with a load suppressor, thus allowing the use of a low voltage below 5 V, which reduces the emission of EMC up to levels lower than background disturbances. Thus, the system of the present utility model, due to the reduction of the number of cables laid in the wagon installation, is a cost-effective solution, which reduces the consumption of copper cables when laying the system, while reducing the overall structural cost of one wagon, which in turn leads to an effective reduction of the risk of interference between wagon systems induced by long wire lines. The automatically set optimum of the intensity of illumination when starting the illumination in the wagon from the central dashboard provides additional energy saving for illumination, which leads to optimization and reduction of the operating costs for traveling per unit wagon.

The system, according to this utility model, allows the luminaire to operate as an independent system even in the absence of central wagon control and takes measures to conserve wagon batteries in emergencies by intelligently distributing the remaining battery energy and providing longer of normal lighting in the wagon, based on the information provided to the lighting in the passenger compartment to reduce the consumption to the minimum standard in the start mode and subsequently reflect the desire for light passenger compartment in the passenger compartment.

2830 W

Explanation of the annexed figures

An exemplary description of an LED lighting system for railway vehicles according to the utility model is provided by means of the accompanying drawings, where:

Figure 1 is a side view of LED module A of the lighting system;

Figure 2 is a bottom view of the base of LED module A;

Figure 3 is a top plan view of the base of the LED module A coupled to the start-up unit B;

Figure 4 is a cross-sectional view of the LED module A coupled to the start-up unit B;

Figure 5 is a functional diagram of the LED module A, the start-up unit B and the system 15 implemented in the wagon;

Figure 5a is a view of a coupe panel;

Figure 6 is an electrical diagram of the start-up unit B and the LED matrix of LED module A;

Figure 6a is a schematic diagram of a solution for controlling the energy consumption depending on the voltage applied to the batteries of the wagon;

Figure 7- General view of the electronic control unit 22.

Examples of implementation of the utility model

The description provides an exemplary description of an LED lighting system for attachment to the interior of a railway vehicle. The exemplary embodiment of the LED lighting system according to FIGS. 1-7 merely clarifies it and does not limit it by its functional purpose or technical effect.

The LED lighting system according to the exemplary embodiment for railway vehicles consists of: LED module A and a light intensity controller, the LED module A comprising an LED illuminator constructed from an outer housing with base 1 with mounting apertures 11 and a light aperture 12 to which an attachment system 9 comprising a bolt, brackets and pre-applied at the edges of the bed mountings and a polymeric dust adhesive 13 an aluminum profile is attached to the LED matrix 2 positioned in e at its end, caps 3 as a prefabricated module located on the base 1, the inside of which by means of crimping are placed the EEE matrix 6, at whose two ends at an angle of 128 ° two reflectors 7 are positioned bilaterally, in the front of the aluminum profile 2 is the crimp and diffusion matrix 8.

The front of the housing base 1 is secured by adhesive binders and additionally by anchorage securing elements 5 with mounting bolts and polymer glass

4. Start-up unit B from the controller for controlling the WEEE matrix 6, control the power according to a standard control scheme (central wagon board E to the start-up electronic unit B) and a system for controlling the energy consumption of the illuminator in accordance with the value the supply voltage from the wagon batteries, as well as the individual control system 15 built into the circuit solution, together with the power control system 14 and the impulse regulator 16. As the power control system 14 monitors energy consumption from the luminaire according to the value of the supply voltage from the wagon batteries, generating a correction signal to the impulse regulator 16, regardless of the switching mode of consumed power from 0% to 100% of the central wagon panel E, thus ensuring optimal consumption of the batteries in cases where the wagon runs out of central supply and switches the luminaire to emergency mode with a power consumption of 3 XV automatically upon reaching a threshold voltage below 19 volts of batteries.

Individual control system 15 in the passenger compartment including an electronic control unit 22 connected to the amplifier of the audible alarm system in the passenger compartment and to the panel 17, which is implemented in the form of soft-touch buttons 18 and 19 illuminated by indicator LEDs in the existing indication the vehicle emergency brake plate controls the lighting and the audible warning system in the passenger compartment. Panel 17 is provided with a light bar

2830 υι indicators 20 and 21 for the settings of systems controlled by a processor system that produces and controls signals for the respective systems, being fed and connected by a wiring harness to the electronic control unit 22, which incorporates an audio signal amplifier, adapter for the control signal for the lighting in the passenger compartment and the power converter from the wagon battery voltage in the corresponding +5 and +12 V. The soft-touch buttons 18 integrated in the coupe control panel control the sound in the passenger compartment, and the soft-t 19 pm buttons responsible for managing lighting in the cabin, the indicator 20 is responsible for the sound settings in the passenger compartment and the indicator 21 is responsible for setting the brightness of the interior.

Operation and use of the system

The system according to the present utility model provides the necessary operating modes (Figure 5, 5a, 6 and 6a) by feeding and controlling externally through a four-wire line L.1 - L.4, through which commands come from the central wagon, supplying voltage from wagon batteries, as well as the control signal from the coupe panel, where, when the plug 11 is duplicated, each lamp is sequentially powered and controlled by more than one luminaire, through contacts L and 32 a control voltage of + 24V / 100% and + 24U / 50% of central weight HHO panel E with which it can switch the luminaires in the standard modes, the normal 100% and 50% economical. K7 resistor divider system; K.6 and K2 and diode switch ϋΐ 1 from the start-up unit B monitor the incoming battery voltage, with the diode switch Ώ11 providing voltage to the resistors only at an input voltage greater than 16 V on the battery and ensuring that in emergency situations complete discharge of the batteries, where, within the range of 18 to 28.8 volts, the operating voltage from the exhausted to fully charged wagon battery, the system divides the percentage range and delivers a percentage signal ΑΩ1, k to the input of the impulse regulator circuit depending on this signal, the electronic control changes the final power consumption of the luminaire and the luminaire operates as an independent system, even in the absence of control of the central wagon panel E, will take measures to preserve the car batteries in emergency situations and by intelligent distribution of the remaining in batteries the energy will provide longer time of normal illumination in the wagon, where in a separate line of the connecting cable 41.3 information arrives on the change of consumption of the luminaire helminth of kupeyniya panel 17 by the electronic unit 22, which supplies information on interior lamps to reduce power consumption to the minimum standard in startup mode and subsequently reflects the desire for light passenger cabin.

Considering the standards for the operation of the wagons and for the achievement of optimum performance indicators, the information signal from the coupe panel changes the power of the luminaires only in the given two ranges, respectively 50% in one mode and 100% in the other mode set by the central wagon panel, compensated by the coefficient calculated by each luminaire based on the supply voltage.

The signals of L.1 + 24U / 100% and L.2 + 24U / 50% are received at the anodes of diodes Ό2, ϋ3 via diode ϋΐ, the signal is transmitted + 24U / 100% entering the resistor K4 and to resistors K. 5 and K7. The K7 resistor conducts the incoming battery voltage onto the diode switch ϋ11, whose voltage is subsequently limited by the zener diode ϋ12, so it is fed to the control divider realized with the K6-K2 resistors, which form the voltage monitoring signal to that voltage point, an additional reference voltage is applied via a K1 impulse resistor K1 plus 1L / 8 (ULL) as a result of which the emergency operating mode of the LWE array diodes 05-ϋΙΟ of 3 \ Y is ensured. The impulse controller 1L, which provides conditions for operation of the LSE matrix, is further controlled by the incoming PM signal from the body panel via the L.3 and the current limiting resistor K3. The other components of the circuit are the control elements of the impulse controller 1L according to the manufacturer's circuit.

Claims (8)

Claims 1. Controlled LED lighting system for railway vehicles comprising an LED module, a light intensity controller and a power source characterized by: 2830 W is that the LED module (A) comprises an outer housing - base (1) with light opening (12) and mounting holes (11) to which an LED profile is attached to one side by means of a fastening system (9). a matrix (2) with caps (3) positioned at their two ends, inside which are placed a BEL matrix (6) with diffusion matrix (8) opposite to it and reflectors (7) angled with respect to the LEL matrix (6). and positioned at both ends on the base (1), and the controller includes a control unit (B) and an ind. individual control (15), where the actuation control unit (B) is supplied by a cable from the power source in the form of a central wagon board (E) and connected together with the LED module (A) in one luminaire and secured by the other - face of housing base (1) by means of polymeric dust adhesive (13) on back of profile for LED matrix (2) by means of safety elements (5) with mounting bolts and polymer glass (4), and is equipped with control system for power (14) and impulse controller (16), and the system is individual Control (15) supplied by the central wagon panel (E) associated with the luminaire, and includes an electronic control unit (22) which is connected with an audible alarm system (10) in the passenger compartment and buy a control panel (17). Controlled LED lighting system according to claim 1, characterized in that the mounting system (9) connecting the profile of the LED matrix (2) to the housing base (1) includes a bolt, brackets, polymeric dustproof adhesive (13) and their combination. Controlled LED lighting system according to claim 1, characterized in that the profile of the LED matrix (2) is made of extruded aluminum, injection molded aluminum, sintered aluminum, copper, zinc and a tsam profile. Controlled LED lighting system according to claim 1, characterized in that the LSE matrix (6) is housed inside the profile of the LED matrix (2) by means of crimping. Controlled LED lighting system according to claim 1, characterized in that the polymer glass (4) is positioned on the base (1) by adhesive binders and additionally secured by anchoring elements (5) through which the mounting bolts pass. Controlled LED lighting system according to claim 1, characterized in that the reflectors (7) are arranged at an angle of from 100 to 150 ° with respect to the BEL matrix (6). Controlled LED lighting system according to claim 1, characterized in that the control panel (17) is equipped with soft-touch buttons (18 and 19), light bar indicators (20 and 21), and the electronic control unit (22) ) is equipped with a lamp control signal adapter and a power supply unit common to the control panel (17) and the sound amplifier of the sound signaling system (10). Controlled LED lighting system according to claim 1, characterized in that the actuator control unit (B) is connected externally to the central wagon panel (E), to the supply voltage from the wagon batteries and to the control signal from the passenger compartment panel (17) ), as well as the LED matrix (6) of the LED module (A) through the contacts of the connectors on a four-wire line (L.1 - L.4), connected respectively to the plug duplicated on the board (L.1 - L.4). the next illuminator, where the contact (L. 1) of the couplings connects to k ontact 2 of diode (L2) on one side, and on the other respectively by contact (1) of diode (L2), it connects to the resistor (K4 / 1), at the same place are connected the reverse diode (04/1) and the transfer diode 01/2, with diode 01/1 connecting on the other side to the intermediate connection coming from the contact of the plug (Ί1.2) and the diode (L3), connecting to the current-determining resistor (K5 / 1), the current-determining resistor (K. 7/2), a capacitor (C2 / 1), together with the feeder leg 4 of the impulse regulator and (1-16), while the resistors (K.4 / 2) and (K5 / 2) on the other side are connected to each other and with YELLOW MAT lattice (6), built by the LEDs (L5, L6, L7, L8, L9 and L10), as well as with a pulse regulator (1L / 3 8ΕΝ8Ε), and the diode array on the other side is connected to the conversion inductor (L1 / 2 ), the converter inductor (b1 / 1) is connected to a diode (l4 / 2) and is fed from the output of the transistor key terminal 1 (§ \ Y) of the pulse regulator (and 1) - (16), where the pulse regulator (and 1) on the other hand, by means of a contact leg, the mass of the chip 2 (ΟΝϋ), together with a capacitor (C2 / 2), a resistor (K2 / 1), a diode (L12 / 2) are connected to the ground of the circuit, which 2830 υι comes through the socket (L. 4) of the couplings, where the resistor (K.7 / 1) is connected to a diode (Ώ11 / 1) and it in turn connects to a diode (Ώ12 / 2) and a resistor (K .6 / 1) connected to the input of the impulse regulator control circuit (and 1/7 (Α 1 I)), resistors (K2 / 2) and (K1 / 1) connected to its contact. (2) with a pulse regulator plus a chip (1L / 8 (MA)), while the pulse regulator (and 1) - (16) is connected to a capacitor (C1 / 1 by means of a contact compensating leg (5) (COMP)). ) and on the other side is connected to a table, through the socket (L .3) connected to the res. of stop (CS / 1) and consequently a resistor (K.3 / 2) is coupled to the input of the pulse-width modulation (υΐ / 6 (\ νΡΜ)) for receiving the control signal from the panel in the passenger compartment (17).