FR2593454A1 - Multi-circuit safety installation, especially a compressed air braking installation for motor vehicles - Google Patents

Abstract

a) Multi-circuit safety installation, especially a compressed air braking installation for motor vehicles. b) Characterised in that in the pressurised system, sensors 8, 16, 17, 18, 19, 20 are combined, on the primary side and on the secondary side, with valves 2, a sensor 16, 17, 18, 19, 20 combined on the secondary side with a valve 2 at the same time being combined on the primary side with a valve 2 situated downstream and in that the sensors 8, 16, 17, 18, 19, 20 as well as the valves 2 are connected to an adjusting installation 6 and in that the sensors 16, 17, 18, 19, 20 are connected each time to a braking circuit 11, 12, 13, 14, 15.

Description

"Security installation with several circuits, in particular
compressed air braking system for vehicles with
engine
The present invention relates to a safety installation with several circuits, in particular compressed air braking installation for motor vehicles.

 The invention relates in particular to the field of safety installations with several circuits, in particular to compressed air braking installations of motor vehicles with electronic regulation.

 We know different security installations with several circuits which are generally based on mechanical principles. In these known safety installations, the opening and / or closing pressures are obtained by the cooperation of spring forces, friction forces and / or variable active surfaces. As a result, a large fraction of these control variables undergoes long-term variations, which necessarily causes variations in the opening pressure and / or the closing pressure. In order that these adjustment variables do not unacceptably increase or decrease the pressures, the active surfaces are produced in a corresponding manner and very small tolerances are fixed for the parts and groups of parts. This results in technical means and significant manufacturing costs with correspondingly high manufacturing costs. In addition, a large part of the known security installations has a very complicated structure.

The present invention aims to create a safety installation with several circuits of the above type, intended in particular for compressed air braking installations of motor vehicles overcoming the drawbacks of mechanical functioning installations and which - in the event of failure of a circuit, allows to return to
normal operating pressure in circuits
not faulty, and to maintain the pressure at this level, - in the event of faults in the intact circuits, not comprising
no tank, allows that it is not cut, - a new automatic filling of the defective circuit
once the incident has been repaired so as to avoid any
exhaust air from the installation, filling the installation with a circuit
defective up to normal operating pressure,
without limit and possibility of pressure balancing
in intact circuits.

 To this end, the invention provides for the mounting of measurement and adjustment members of the electronic adjustment installation in the pressure system between the installation which supplies the compressed air and the users of compressed air, so simple and with minimal means.

 To this end, the invention relates to an installation of the above type, characterized in that in the pressure system, sensors are associated on the primary side and on the secondary side with valves, a sensor associated on the secondary side with a valve being at the same time associated on the primary side with a valve located downstream and in that the sensors as well as the valves are connected to an adjustment installation and in that the sensors are connected each time to a braking circuit.

 The valves have an open position and a closed position; these valves are short-circuited by auxiliary lines. In each auxiliary line, there are throttling devices and shut-off valves.

The control system performs the following functions - switching the valves according to the pressures
mayor and secondary, - implementation of the control installation, - monitoring and control of the various components of
multi-circuit security installation.

 The present invention will be described below using an embodiment shown in the single appended figure which is a partial diagram of a compressed air braking installation.

 According to the figure, the exemplary embodiment comprises, in the direction of passage of the fluids, a pressure line 1 which supplies compressed air from a compressor (not shown) to the various brake circuits 11, 12, 13, 14, 15 2. Electrically controlled valves 2 are provided in the pressure line; these valves open or close the pressure line 1. Each valve 2 is short-circuited by an auxiliary line 3 which is connected to the pressure line 1. Throttling members 4 are provided in each auxiliary line 3. It is also possible provide non-return valves 5.

 In the regulating part of the unit subjected to the pressure, there is provided a regulating installation 6 which is connected on the one hand to the sensors 8, 16, 17, 18, 19, 20 by the pipes 7 and on the other part to the valves 2. The adjustment installation 6 comprises an optical and / or acoustic control installation 9 for the driver of the vehicle. The two installations are connected by a pipe 7.

 The electrical energy necessary for operation is supplied by a voltage source 10.

The sensors 8, 16, 17, 18, 19, 20 are associated with the valves 2 to detect the pressure upstream and downstream of the valves 2.

The operation of the installation described above is as follows
A compressor, not shown, supplies compressed air through the pressure line 1 to the valves 2. The valves 2 are preferably kept closed in the absence of pressure. The compressed air then acts on the sensor 8 of the pressure line 1. The latter supplies a signal proportional to the pressure via the line 7 to the adjustment installation 6.

The auxiliary lines 3 which short-circuit the valves 2 allow part of the compressed air to pass through the pressure lines 1 downstream of the valves 2; at this point, the compressed air acts on the sensors 16, 17, 18, 19, 20. The adjustment installation 6 receives signals proportional to the pressure from the sensors, via the pipes 7. The installation of setting 6 ensures the exploitation of these signals. If the operation carried out in the adjustment installation 6 indicates that the signals are within predetermined limits, the valves 2 are controlled and switched.

 I1 results in the opening of the entire section of the pressure line 1 and the compressed air passes without obstacle through the pressure line 1.

When, as a result of a defect in the pressure line 1, the pressure drops, this drop results in a change in the signals supplied by the sensors 8, 16, 17, 18, 19, 20 to the adjustment installation 6. The exploitation of these signals leads to the switching of certain valves via the lines 7 so as to restore the system pressure in the intact part of the installation. When the causes having helped the pressure drop disappear, the corresponding part of the braking system again receives compressed air through the auxiliary lines 3 and when the predetermined limit value is reached, the adjusting system 6 closes the valves again 2.

List of references
1 pressure line
2 valve
3 auxiliary line 4 throttle body
5 check valve
6 setting installation
7 driving
6 sensor
9 control system
10 voltage source
11 brake circuit
12 brake circuit
13 brake system
14 braking circuit
15 brake system
16 sensor
17 sensor
18 sensor
19 sensor
20 sensor.

Claims (4)

 10) Safety installation with several circuits, in particular compressed air braking installation for motor vehicles, installation comprising an electronic adjustment means with protection of each of the braking circuits, installation characterized in that in the system under pressure, sensors ( 8, 16, 17, 18, 19, 20) are associated on the primary side and on the secondary side with valves (2), a sensor (16, 17, 18, 19, 20) associated on the secondary side with a valve (2 ) being at the same time associated on the primary side with a valve (2) located downstream and in that the sensors (8, 16, 17, 18, 19, 20) as well as the valves (2) are connected to an installation adjustment (6) and in that the sensors (16, 17, 18, 19, 20) are connected each time to a braking circuit (11, 12, 13, 14, 15).  20) Multi-circuit safety installation according to claim 1, characterized in that the sensors (8, 16, 17, 18, 19, 20) react to pressure variations and the valves (2) have an open position and closing.  30) Multiple circuit safety installation according to any one of claims 1 and 2, characterized in that the adjustment installation (6) is associated with an optical and / or acoustic control installation (9).  40) Multi-circuit safety installation according to any one of claims 1 to 3, characterized in that the adjustment installation (6) comprises means for monitoring the operating state of the entire installation, in particular - valve switching as a function of pressures  primary and secondary, - implementation of the control installation, - monitoring and control of the various components of  multi-circuit security installation.