MXPA95002162A - Electro-pneumatic control system for puer - Google Patents

Abstract

The present invention relates to an electro-pneumatic control system for doors, particularly for doors of passenger transport vehicles, which does not allow the driver to put the vehicle in motion with open passenger entry / exit doors. Additionally, according to the present invention, it is necessary for the vehicle to be closed so that the doors can be opened. These effects are achieved by the fact that the activation of the service and parking brakes (29, 30) of the vehicle is linked to the opening and closing of the doors.

Description

"SYSTEM ELECTRONIC CONTROL FOR DOORS" Inventors: FERNANDO ANTONIO GRANDOLPHO, Brazilian, domiciled in Rúa México 478, Sao Bernardo do Campo, Sao Paulo, Brazil and JOAO ORLANDO PONTES, Brazilian, domiciled in Rúa Leonardo Fioravante 96, Santo Andre, Sao Paulo, Brazil.

Causaire: MERCEDES-BENZ DO BRASIL S.A., Brazilian company, domiciled at Av. Alfred Jurzykowski 562, Sao Bernardo do Campo, Sao Paulo, Brazil.

DESCRIPTION OF THE INVENTION The present invention relates to an electro-pneumatic control system for doors, particularly for doors of passenger transport vehicles such as buses or the like. More specifically, the invention relates to an electro-pneumatic door control system, which prevents the driver from setting the vehicle in motion with the doors open. In addition, the proposed system does not allow the driver to open the doors while the vehicle is in motion, that is, it is necessary to stop the vehicle to be able to open the doors. These effects are achieved by the fact that the activation of the service and parking brakes of the vehicle is linked to the opening and closing of the doors. US Patents 4,546,845 and DD 154,162 disclose electro-pneumatic controls for vehicle doors that prevent the doors from opening while the vehicle is in motion, and which result in the actuation of the brakes while the vehicle is stopped with the doors open. The object of the present invention is to provide an electro-pneumatic control system for vehicle passenger transport doors such as buses, which brings greater security for the users compared to the systems known up to now.

This objective is achieved by the fact that the electro-pneumatic control system for doors comprises pneumatic door actuation means, a pressurized fluid supply source and even valve means connected to the pressurized fluid supply source which respond to signals selective means for supplying pressurized fluid to the pneumatic actuating means of doors, valve means connected to the pneumatic actuating means of doors and to the vehicle brake system which respond to selective electrical signals for braking the vehicle and switch means of pressure connected to the ignition system and vehicle brake system that respond to selective pressure signals to supply an electrical signal to the ignition system. According to the present invention, an electro-pneumatic control system for doors is proposed by which it is only possible to disconnect the vehicle contact when the parking brake is activated, emitting an audible signal in the event that the vehicle operator tries to disconnect the contact without the parking brake being activated. This prevents the driver from closing the doors from outside the vehicle, unlocking the brake system through the doors, without the guarantee that the parking brake is activated. In addition, in the event that the vehicle operator releases the air from the door drive cylinders (neutral position of the actuation valve or emergency relief valve) with the vehicle contact connected, the brakes will be activated. This will ensure that the vehicle is braked if the driver leaves in this condition. A pilot light is still provided on the vehicle panel, which emits a light signal while the brakes are acting as a result of the opening status of the doors. The invention will now be described in more detail on the basis of an exemplary embodiment, illustrated in the drawings. Brief Description of the Drawings: - - - Figure 1 is a schematic diagram of the proposed electro-pneumatic control system. Figures 2A and 2B represent a schematic diagram of the electrical circuit comprised by the control system. - Figure 3 represents a schematic view of the part of the control system that is mounted on the chassis of the vehicle. Detailed Description of the Figures Figure 1 shows a diagram that schematically combines the electrical and pneumatic parts of the control system, where the lines of the electrical circuit are drawn in dotted lines and the lines of the pneumatic system are drawn in full lines. The symbols used to represent the valves, switches, contacts and connections are the conventional symbols. The pneumatic cylinder of the front door of the vehicle is indicated by reference 3, while the pneumatic cylinders of drive of the rear doors are indicated by references 4 and 5. References 18, 19, 20 and 21, 22, 23 indicate , respectively, the opening sides and the closing sides of the doors in the pneumatic cylinders 3, 4, 5. According to the present invention, it is not possible to open the doors with the vehicle in motion. This is only possible when the vehicle is stopped. With the vehicle with contact 50 disconnected, the control system is inactive. When the vehicle with the contact 50 is connected, in movement and with the doors closed, the tachograph 1 emits an electrical signal that blocks, through two-way electromagnetic valves / two positions 6, 7, 8, 9, the passage of air of the pressurized air supply reservoir 2 for the inlets and outlets of the pneumatic cylinders 3, 4, 5 for driving the front and rear doors. Thus, when the vehicle is in motion, the doors do not open. This will only be possible when the vehicle is stopped, because only then tachograph 1 ceases the electrical signal in the electromagnetic valves 6, 7, 8, 9, which then allow the passage of air to the pneumatic cylinders 3, 4 5. According to the electric circuit of Figures 2A and 2B, a triplex mechanism 11 is connected to the cable of the mechanical speedometer 10 of the tachograph 1 and to the control box. 100 change of the vehicle. The triplex mechanism 11 is still connected to a pulse generator 12, which transforms the mechanical signal of the movement of the vehicle into an electrical signal that feeds a speed module or an opening interruption module of the doors 13. In the case of If the vehicle is in motion, the opening interruption module of the doors 13 sends an electrical signal to the auxiliary relay 14 of the two-way electromagnetic valves 6, 7, 8, 9, which block the air passage of the reservoir of pressurized air supply 2 to the electro-pneumatic cylinders 3, 4, 5. If the vehicle is stopped, the opening interruption module of the doors 13 does not send the electrical signal to the auxiliary relay 14 and the doors can be opened. For vehicles equipped with an electronic tachograph, the pulse generator 12 is already incorporated in the same tachograph, so the use of the triplex mechanism is dispensable. According to the present invention, the vehicle with the rear and / or front doors open, the driver is unable to put the vehicle in motion before closing the doors. In addition, in order to close the doors, the driver of the vehicle must activate the service brake or the parking brake. The door drive cylinders 3,4,5 are provided with limit switch connectors 24, 25, which are actuated or closed at the beginning of the opening of the doors, that is, when the pistons of the pneumatic cylinders 3. , 4, 5 move to positions 18, 19, 20 of the cylinder chambers. During the opening of the front door or rear doors, the limit switch connector 24, 25 sends a signal towards a three-way / two-position valve 26, which unblocks the passage of air in the brake system, by actuating the brake. service of - - vehicle. The liberated air is regulated at a pressure of 35,000 Kgf / m2 (3.5 bar) through a pressure regulating valve 27, mounted next to the valve 26, in the vehicle frame 28 near the pressurized air supply reservoir (figure 3). Figure 3 shows still a four-circuit valve 72, a quick discharge valve 74 and a pedal valve 76, which belong to the brake circuit. A pressure switch 52 (normally open), which closes the contact of a pilot lamp 53, is provided next to the pressure regulating valve 27, resulting in the emission of a light signal on the panel, while the system is active, that is, while the brakes are operated by the doors at the pressure of 35,000 Kgf / m2 (3.5 bar). The pressure of 35,000 Kgf / m2 (3.5 bar) is sufficient to keep the vehicle stationary without compromising the durability of the brake cylinders 29, 30. The supply of the rear brake cylinder 29, 30 must be done in parallel with the rear brake system, through a double circuit valve "Ó" 31, coupled as close as possible to the brake cylinders 29, 30, in order not to compromise the safety of the vehicle's brake system. With the vehicle stationary, so that the doors can be closed, the driver must operate the service brake 70 or the parking brake. The air switches 32 and 33 connected, respectively, in the closing line of the front door and in the closing line of the rear doors, are normally closed, opening only with pressures in excess of 10,000 Kgf / m2 (1 bar) . With the doors open, the pressure in the closing lines of the doors is less than 10,000 Kgf / m2 (1 bar), causing the pressure switches 32, 33 to remain in the closed position. With the air switches 32, 33 in the closed position, an electrical signal is sent to the electromagnetic valves 6, 7, 8, 9, which block the passage of the pressurized air to the drive cylinders of the door in question. Two other pressure switches are provided, one normally closed 34 (opens with pressure greater than 10,000 Kgf / m2 (1 bar), coupled to the valve outlet of the service brake 26, which commands the rear brake cylinders 29, 30, and another open 35 (closes with pressure greater than 5,000 Kgf / m ' '(0.5 bar), coupled to the inlet of the rear brake cylinders 29, 30 in the parking brake chamber (not shown), these switches are intended to release the electromagnetic valves 6, 7, 8, 9 , which block the passage of pressurized air to the operating cylinders 3, 4, 5 of the doors when the service brake or the parking brake is activated.Thus, by operating the service brake 70, the air pressure rises for more than 10,000 Kgf / m2 (1 bar), causing the air switch 34 to open and release, through the electromagnetic valves 6, 7, 8, 9, the air passage to the pneumatic cylinders 3, 4, 5. In the same way, the parking brake is applied, the air pressure at the inlet of the rear brake cylinders fall to less than 5,000 Kgf / m2 (0.5 bar), which results in the opening of the air switch 35 and in the consequent unblocking of the air passage to the pneumatic cylinders 3, 4, 5. The closing of the doors is linked to the actuation of the parking brake to prevent the driver from unlocking the service brake by manually closing the doors on the outside of the vehicle, unlocking the parking system. brake by the doors. The closing of the doors is also linked to the service brake 70, to avoid that it is necessary to operate the parking brake when it is desired to close the doors in working condition. Figure 1 illustrates, schematically, the valve for actuating the front door 38, with the positions closed 35, neutral 40 (unlocks the door) and open 41, and the valve for actuating the rear door 45, also with the positions close 46, neutral (unlocks the door) 47 and open 48. According to the present invention, if the driver of the vehicle releases air from the drive cylinders 3, 4, 5 of one or both doors, the service brake will be automatically activated, to ensure that the vehicle is braked in the event that the driver leaves in this condition. In addition, when the air is released from the drive cylinders 3, 4, 5, the manual opening of the doors will be hindered. When the driver releases the air from the drive cylinders of one or both of the doors (neutral position of the actuation valves 38, 45 or emergency relief valve (not shown), with the vehicle contact 50 in operation, the pressure in the respective closing lines fall to less than 10,000 Kgf / m2 (1 bar), causing the pressure switches 32, 33 to remain in the closed position With the switches 32, 33 connected to the three-way valve / two positions 26 , an electrical signal is sent to the latter, which unlocks the passage of air in the brake system, by operating the vehicle service brake.In addition, with the pressure switches 32, 33 in the closed position, an electrical signal is sent towards the electromagnetic valves 6, 7, 8, 9, which prevent the passage of air to the cylinders 3, 4, 5 and, consequently, block the doors of the vehicle, according to the present invention, it is only possible disconnect the contact of the vehicle when the parking brake is activated. Additionally, if the driver of the vehicle tries to disconnect the contact 50, without the parking brake having been activated, a sound signal will be issued on the vehicle panel, through a warning cicada 55. According to the figures, the disconnection of the motor vehicle contact is done through the power relay 84 of the contact 50. When the vehicle is disconnected, energy is sent to the engine stop-off pointer 82, which operates the engine stop valve 86. Also, according to the present invention, the power relay 50 receives energy from both the contact 50 and the line A, coming from the parking brake of the vehicle. As long as the parking brake is not activated, the air switch 35 remains in the closed position, so that the line A is sent current to the relay 84. Thus, even turning the key of the contact 50 to the non-contact position, energy will be sent to the relay 84, and the vehicle can not be disconnected. On the other hand, by actuating the parking brake, the air switch 35 will go to the open position, blocking on the line A the current passage to the relay 84. In this situation, turning the key of the contact 50 to the position of no. -contact, the motor will be disconnected. Still according to the present invention, a warning cicada 55 is provided below the instrument panel of the vehicle (not shown). If the driver tries to disconnect the vehicle contact 50 without the parking brake being applied, there will be no passage of current to the coil of the relay drive 54, causing the relay to be switched to feed the cicada 55, thus issuing a sound warning to the driver. Diode boxes 60, 61, 62 are provided in the electrical part of the system, which prevent the return of the current coming from the door switches. They are used so that the front door does not interfere with the rear doors. Also illustrated in the electrical diagram of FIGS. 2A and 2B, fuses 78, 80 and a brake light 92. In the electric circuit, the lines leading to the battery E, to the starting motor F and to the alternator G of the motor are identified. vehicle. It should be understood that the described electronic pneumatic control system for doors is only a preferred embodiment of the invention, the real scope of which is defined by the appended claims. It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects or products to which it refers. Having described the invention as above, property is claimed as contained in the following:

Claims (7)

1. An electro-pneumatic control system for doors, particularly for passenger entry and exit doors of a passenger transport vehicle, having pneumatic door operating means and a pressurized fluid supply source, characterized by comprising valve means connected to the pressurized fluid supply source and the pneumatic actuating door means responsive to the selective electrical signals for supplying pressurized fluid to the pneumatic means and to the vehicle brake system responsive to the selective electrical signals for the braking of the vehicle and means of Pressure switch connected to the ignition system and the vehicle brake system responsive to the signals. selective pressure to supply an electrical signal to the ignition system. A control system according to claim 1, characterized in that the braking of the vehicle, when provided through the valve means, is done in parallel with the vehicle's brake system and at a pressure ß substantially less than the pressure of the vehicle. medium braking of the vehicle. 3. A control system according to claim 2, characterized in that the braking of the vehicle, when provided through the valve means, is done at a pressure of approximately 35,000 Kgf / m (3.5 bar). A control system according to claim 1, characterized by pressure switch means in connection with pressurized fluid lines closing the doors and with the valve means responsive to selective pressure signals to send an electrical signal for the valve means. 5. A control system according to claim 4, characterized in that the pressure switch means is in connection with the valve means, wherein the valve means is responsive to the selective electrical signals received from the pressure switch means for braking the vehicle. A control system according to claim 1 or 4, characterized in comprising pressure switch means in connection with the exit of the valve means and with the entry of the brake cylinders in the parking brake chamber of the vehicle, responsive to selective pressure signals to block the transmission of electrical signals to the valve means. 7. A control system according to claim 1, characterized in that it comprises a warning cicada responsive to selective electrical signals received from the pressure switch means and the ignition system of the vehicle. In testimony of which I sign the present in this City of Mexico, D.F., on May 11, 1995. Attorney