WO2021044091A1 - Hydraulic system and associated method for detecting a leak in the control line - Google Patents

Hydraulic system and associated method for detecting a leak in the control line Download PDF

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Publication number
WO2021044091A1
WO2021044091A1 PCT/FR2020/051498 FR2020051498W WO2021044091A1 WO 2021044091 A1 WO2021044091 A1 WO 2021044091A1 FR 2020051498 W FR2020051498 W FR 2020051498W WO 2021044091 A1 WO2021044091 A1 WO 2021044091A1
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WO
WIPO (PCT)
Prior art keywords
control
pressure
braking
valve
threshold value
Prior art date
Application number
PCT/FR2020/051498
Other languages
French (fr)
Inventor
André PRIGENT
Original Assignee
Poclain Hydraulics Industrie
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 Poclain Hydraulics Industrie filed Critical Poclain Hydraulics Industrie
Publication of WO2021044091A1 publication Critical patent/WO2021044091A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/108—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic to a trailer fluid system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • B60T7/20—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger specially for trailers, e.g. in case of uncoupling of or overrunning by trailer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/403—Brake circuit failure

Definitions

  • the present invention relates to the field of hydraulic braking circuits, and in particular finds an application for vehicles coupled to trailers.
  • Hydraulic braking systems for vehicles which can be fitted with a hitch, for example tractors, comprise a hydraulic control line and an additional hydraulic line connecting the vehicle to its hitch.
  • the control line is controlled by the user, as a function of a braking instruction that he applies, for example by pressing a vehicle service brake pedal which forms a vehicle braking control.
  • the additional pipe is itself typically supplied with pressure by a pump delivering a fixed and relatively low pressure.
  • EU regulation 2015/68 requires in particular that in the event of a failure in the control line, the pressure in the additional line must drop to 1000 kPa within two seconds of the moment when the service brake control has actuated and then drops to ambient pressure or 0 kPa.
  • the present disclosure thus aims to respond at least partially to these problems, and proposes a hydraulic braking system for a vehicle comprising a control line and an additional line adapted to be connected to a hydraulic braking system of a coupling , the system including
  • a braking control adapted to be actuated by a user so as to deliver a braking pressure
  • control valve electronically receiving a constant initialization setpoint, typically predetermined, so as to deliver a minimum control pressure to the control line, the braking system being characterized in that it further comprises
  • control pressure sensor configured to measure the control pressure
  • a brake control sensor configured to detect an actuation of the brake control
  • a computer configured in such a way as to trigger an actuation of the braking control, triggering a time delay at the end of which the measured control pressure is compared with a control pressure threshold value, if the pressure measured control pressure is less than the control pressure threshold value, the computer controls an additional valve so that the pressure delivered to the additional line is zero, and controls the control valve so that the pressure in the control line is zero.
  • the brake control sensor is a potentiometer, a position sensor, a pressure switch or a pressure sensor associated with the brake control.
  • the computer is configured so as to define the constant initialization setpoint and the control pressure threshold value as a function of the temperature of the fluid of the hydraulic system, of the nominal speed of rotation of an engine primary vehicle, and the displacement of a hydraulic pump of the vehicle, or alternatively, depending on the flow of the resulting hydraulic pump.
  • the constant initialization setpoint which will determine the minimum control pressure, is between 10 and 40 bar, or by example between 12 and 18 bar and the control pressure threshold value is between 10 bar and 15 bar.
  • the time delay has a duration of between 0.6 and 1.5 seconds.
  • a method of controlling a hydraulic braking system of a vehicle comprising a control line and an additional line adapted to be connected to a hydraulic braking system of a coupling, in which
  • a braking control is actuated so as to deliver a braking pressure
  • a time delay is triggered and a constant initialization setpoint, typically predetermined, is supplied to a control valve by means of an electronic control, so as to deliver a minimum control pressure to the control line,
  • a measurement of the control pressure is compared to a control pressure threshold value, if the measured control pressure is less than the control pressure threshold value, an additional valve is piloted. so that the pressure delivered to the additional line is zero, and the control valve is piloted so that the pressure in the control line is zero.
  • the time delay has a duration of between 0.6 and 1.5 seconds, or between 0.6 and 1 second.
  • the constant initialization setpoint is between 10 and 40 bar, or for example between 12 and 18 bar and the control pressure threshold value is between 10 bar and 15 bar.
  • the constant initialization setpoint and the control pressure threshold value are defined as a function of the temperature of the fluid of the hydraulic system, of the operating speed of a primary engine of the vehicle, and of the displacement of a hydraulic pump of the vehicle. According to one example, if the measured control pressure is greater than said control pressure threshold value, the control valve is controlled by means of a computer so that the control pressure is proportional to the pressure braking.
  • Figure 1 shows an example of a circuit according to one aspect of the invention.
  • FIG. 2 Figure 2 schematically illustrates a method according to one aspect of the invention.
  • Figure 3 shows another variant of the circuit shown in Figure 1.
  • Figure 4 shows another variant of the circuit shown in Figure 1.
  • Figure 1 shows a system according to one aspect of the invention.
  • a vehicle V provided with a hydraulic system comprising an additional line 100 and a control line 200.
  • the additional line 100 is connected to an additional connector 102, and the control line is connected to a control connector 202, said connectors 102 and 202 being adapted to be connected to a hydraulic coupling circuit as defined in EU regulation 2015/68, such as for example the hydraulic circuit presented in patent application FR 3037023.
  • the additional pipe 100 is supplied by an additional pressure source 110, associated with an additional valve 120 making it possible to control the pressure within the additional pipe 100 and delivered to the additional connector 102.
  • the control line 200 is supplied by a control pressure source 210, associated with a control valve 220 making it possible to control the pressure within the control line 200 and delivered to the control connector 202.
  • the additional pressure source 110 and the control pressure source 210 are separate. As a variant, it may be the same source of pressure, the operation then being unchanged.
  • the vehicle V comprises a computer 400, which is commonly referred to by the acronym in English as ECU (Electronic Control Unit) or electronic control unit.
  • ECU Electronic Control Unit
  • the vehicle V also comprises a braking control 300, typically an actuator such as a brake pedal controlled directly by the user, so as to apply a brake pressure Pf.
  • the control valve 220 is controlled by the computer 400, so that in stable operation, a control pressure Pc delivered by the control valve 220 to the control pipe 200 is a function of the braking pressure Pf.
  • the computer 400 is associated with a control pressure sensor 420 configured so as to measure the control pressure Pc and with a control sensor 430 configured so as to detect an actuation of the brake control 300.
  • the computer 400 thus receives from the control pressure sensor 420 and from the control sensor 430 information relating to the value of the control pressure Pc and to the actuation of the brake control 300.
  • the control sensor 430 can for example be a switch coupled to the braking control 300, a potentiometer, a pressure sensor detecting a pressure variation at the output of the braking control 300, a pressure switch, a position sensor , or any other sensor suitable for detecting a variation of the state or position of the braking control 300.
  • the control sensor 430 When the user actuates the braking control 300, the control sensor 430 thus delivers information to the computer 400 signaling the initiation of a braking control.
  • the computer 400 then initiates a time delay having a duration TO typically between 0.6 and 1.5 seconds, or more precisely between 0.6 and 0.8 seconds, or between 0.6 and 1 second.
  • the control valve 220 is controlled by the computer 400 to deliver a predetermined control pressure Pc to the control pipe 200.
  • This control pressure Pc delivered during this first step is typically delivered according to a set point d 'initialization, which is for example constant and predetermined, and is not proportional to the braking pressure Pf.
  • the initialization setpoint supplied by the computer 400 typically leads to a control pressure Pc having a value different from the desired pressure in the command line when the system is under normal operating conditions.
  • the computer 400 compares the control pressure Pc measured by the control pressure sensor 420 with a pressure threshold value.
  • the comparison is typically performed at the end of the timer, so that between the initiation of the timer and the end of the comparison, the elapsed time is less than 1 second.
  • the computer 400 determines that the system has regular or normal operation (or more generally that it is not faulty). In this case, the control valve 220 is then typically controlled by the computer 400 so as to deliver a control pressure Pc proportional to the braking pressure Pf. The additional valve 120 is then also typically controlled by the computer 400 so as to deliver an additional non-zero pressure Ps. If the measured control pressure Pc is less than the control pressure threshold value, then the computer 400 determines that there is a leak or a fault in the circuit. The computer 400 controls the additional valve 120 so that the pressure delivered to the additional line 100 is zero, and controls the control valve 220 so that the pressure in the control line 200 is zero.
  • control of the valves it is meant that the computer 400 goes by example engage or disengage an electric control of the additional valve 120 and / or of the control valve 220.
  • the control of the additional valve 120 and of the control valve 220 is typically carried out so that the zero pressure in the pipe control 200 and in the additional pipe 100 is established while a period of less than 2 seconds has elapsed since the actuation of the braking control 300 (and therefore since the initiation of the time delay).
  • the control pressure threshold value can be a predetermined value, or be established by the computer 400 for example according to different criteria.
  • the control pressure threshold value can be established by the computer 400 as a function of the temperature of the fluid of the hydraulic system or of the ambient temperature, of an operating speed of a primary engine of the vehicle V, or of the displacement of a hydraulic pump in the hydraulic system.
  • the constant initialization setpoint supplied by the computer 400 to the control valve 220 to deliver a control pressure Pc to the control pipe 200 typically corresponds to the control pressure threshold value within a margin of error, for example example of the order of 10% to 20%, the initialization setpoint always being greater than the threshold value. More generally, the values of the initialization setpoint and of the control pressure threshold value are linked.
  • a margin is applied, typically from 10% to 20% in order to determine the other of these values, the initialization setpoint always being greater than the threshold value.
  • the pressure threshold value is typically between 10 bar and 15 bar or between 10 bar and 40 bar depending on the temperature, speed and pump displacement criteria.
  • the system as presented makes it possible to detect several types of failures by controlling the rate of establishment of a desired pressure in the control line 200.
  • the system as presented makes it possible in particular to detect a failure on the valve.
  • control 220 on the pressure source supplying the control pipe 200, or more generally any leak on a flexible or a pipe of the control pipe.
  • control 200 More generally, the system as presented makes it possible to carry out a preliminary test step during which it is checked whether the system is able to deliver a given pressure. Failure of this test is interpreted as a system failure.
  • the computer 400 can then switch to continuous monitoring of the pressure within the control line 200 as soon as the actuation of the braking control 300 is detected so as to ensure that it does not drop below a low threshold value, which would then reflect a system failure during operation. In the event that the measured pressure drops below this low threshold value, the computer 400 can then deliver an error message to a user of the vehicle.
  • the preliminary test step described above is therefore followed by monitoring of the system in operation.
  • the low threshold value may be of the order of 10 bar, if we consider that the threshold value used during the preliminary test step is between 10 bar and 15 bar.
  • Figure 2 schematically shows a method according to an aspect of the invention associated with the circuit shown above with reference to Figure 1.
  • Step of application of a braking instruction by the user via the braking control 300 This is for example the application of a braking instruction by a user, for example by actuating d 'a brake pedal or brake control.
  • the sensor 430 detects a change of state or position of the brake control 300.
  • E3 Step for initiating a timer.
  • the computer 400 triggers a time delay having a duration TO as indicated above.
  • E4 Step of establishing a control pressure Pc in the control line 200 by the control pressure source 210 and the control valve 220, the control pressure Pc here typically being established according to a setpoint d 'predetermined constant initialization, regardless of the value of the brake pressure Pf.
  • step E5 Step of measuring the control pressure Pc in the control line 200 at the end of the time delay initiated in step E3.
  • E7 Diagnostic step; the computer 400 controls the hydraulic circuit as a function of the result of the comparison step E6.
  • the computer 400 can control the control valve 220 by providing it with a set point supposed to lead to the establishment of a pressure of 48 bar (or 18 bar) in the control line 200.
  • the pressure threshold value can then be equal to 40 bar (or 1500 kPa).
  • the computer 400 determines that the system has a fault.
  • the time elapsing between steps E1 and the end of step E6 is typically less than 1 second.
  • the computer 400 determines the control pressure threshold value and the constant initialization setpoint, this can for example be carried out during step E3.
  • the computer 400 then collects the information required for determining the constant initialization setpoint and the pressure threshold value, for example the ambient temperature or the temperature of the fluid in the hydraulic system, the displacement of a pump of the hydraulic system and / or the operating speed of a primary engine of the vehicle, and defines the constant initialization setpoint and the control pressure threshold value.
  • Figures 3 and 4 show two detailed embodiments of the system already described with reference to Figure 1.
  • a first embodiment is described below with reference to FIG. 3.
  • the braking control 300 is detailed here. It comprises two brake actuators 310 and 320, each controlling a brake, respectively 315 and 325, for one side (right or left) of the vehicle V. Such a brake control structure is used in particular for agricultural vehicles, and makes it possible to facilitate turns. It is understood that the invention also applies to a brake control 300 having a single brake actuator for both sides of a vehicle, the example of brake control 300 illustrated being purely illustrative and not limiting.
  • the brake actuators 310 and 320 are each connected to a brake pressure source 301 and to a first reservoir R1 in which the brake pressure source 301 takes a first fluid. It is understood that this example is not limiting; The invention is also applicable to fluid autonomous actuators such as master cylinders.
  • the brake control 300 comprises a high pressure selector 330, so that the pressure at the output of the brake control 300, that is to say the brake pressure Pf, corresponds to the highest pressure among that delivered by the brake actuators 310 and 320.
  • the control sensor 430 thus typically detects a displacement or a change of state of the brake actuators 310 and / or 320, or a pressure variation at the high pressure selector. 330 or in the line connecting the high pressure selector 330 to the first port 231 of the all-or-nothing solenoid valve 23.
  • the additional pressure source 110 and the control pressure source 210 are a single source of pressure, here a hydraulic pump designated by the reference 510.
  • the pressure source 510 is associated with a pressure limiter 512 adapted to discharge an excess of pressure beyond a pressure threshold value in a second reservoir R2 in which the pressure source 510 takes a second fluid.
  • the additional valve 120 as shown comprises two valves; an additional pilot valve 13 and an additional power valve 14.
  • the additional pilot valve 13 comprises a first port 131 connected to the pressure source 510, a second port 132 connected to the second reservoir R2, and a third port 133. It is understood that the circuit proposed in Figure 3 allows 'use separate fluids for the brake control 300 on the one hand, and for the additional line 100 and the control line 200 on the other hand. In the case where the same fluid is used, the hydraulic pumps 301 and 510 can be one and the same pump, and the reservoirs R1 and R2 may be the same reservoir.
  • the additional control valve 13 is controlled by an electrical control 134 connected to the computer 400, which is opposed by an elastic return means 135 and a transplanting pipe 136 provided with a restriction 137 taking the pressure off at the level of the third port 133.
  • the additional pilot valve 13 thus alternates between a first configuration in which the first port 131 is closed and the second port 132 is connected to the third port 133, and a second configuration in which the first port 131 is connected to the third port 133 and the second orifice 132 is closed.
  • the additional control valve 13 is by default (that is to say in the absence of control applied by the electric control 134) in its first configuration.
  • the additional pilot valve 13 is a proportional valve, so that the pressure at its third port 133 is proportional to the control applied via the electric control 134.
  • the additional control valve 13 can be a non-proportional 2-position valve (valve referred to as an "ON / OFF valve").
  • the transplanting pipe 136 and its restriction 137 are not present.
  • the additional power valve 14 comprises a first port 141 connected to the pressure source 510, a second port 142 connected to the second reservoir R2, and a third port 143 connected to the additional connector 102.
  • the additional power valve 14 is controlled by a hydraulic control 144 connected to the third orifice 133 of the additional control valve 13 which is opposed by an elastic return means 145.
  • a transplanting line 146 provided with a restriction 147 takes the pressure at the level of the third orifice 143 and comes to apply it in opposition to the elastic return means 145.
  • the additional power valve 14 is controlled proportionally between a first configuration in which the first port 141 is connected to the third port 143 and the second port 142 is closed, and a second configuration in which the first port 141 is closed , and the second port is connected to the third port 143.
  • the additional power valve 14 can be a non-proportional 2-position valve (valve that is referred to as an "ON / OFF valve” or an all-or-nothing valve).
  • the transplanting line 136 and its restriction 137 are not necessary and can be omitted.
  • the control valve 220 as shown comprises three valves; an all-or-nothing solenoid valve 23, a proportional solenoid valve 24, and a proportional valve 25.
  • the all-or-nothing solenoid valve 23 is controlled by an electrical control 234 connected to the computer 400, which is opposed by an elastic return means 235. It has a first orifice 231 connected to the high pressure selector 330, and a second orifice 232.
  • the all-or-nothing solenoid valve 23 is configured to either pass through only from its first port to its second port 232, or pass only from its second port 232 to its first port 233.
  • the proportional solenoid valve 24 comprises a first port 241 connected to the pressure source 510, a second port 242 connected to the second reservoir R2, and a third port 243.
  • the proportional solenoid valve 24 is controlled by an electrical control 244 connected to the computer 400, which is opposed by an elastic return means 245 and a transplanting pipe 246 taking the pressure at the level of the third orifice 243 and provided with ' a restriction 247.
  • the proportional solenoid valve 24 is controlled in a proportional manner between a first a configuration in which the first port 241 is closed, and the second port 242 is connected to the third port 243, and a second configuration in which the first port 241 is connected to the third port 243, and the second port 242 is closed.
  • the proportional valve 25 has a first port 251 connected to the pressure source 510, a second port 252 connected to the second reservoir R2, and a third port 253 connected to the control connector 202.
  • the proportional valve 25 is controlled by a hydraulic control 254, typically a double chamber cylinder, connected to the second port 232 of the on / off solenoid valve 23 and to the third port 243 of the proportional solenoid valve 24, so as to apply a command corresponding to the highest pressure between the pressure at the level of the second port 232 of the on / off solenoid valve 23 and the third port 243 of the proportional solenoid valve 24.
  • a hydraulic control 254 typically a double chamber cylinder, connected to the second port 232 of the on / off solenoid valve 23 and to the third port 243 of the proportional solenoid valve 24, so as to apply a command corresponding to the highest pressure between the pressure at the level of the second port 232 of the on / off solenoid valve 23 and the third port 243 of the proportional solenoid valve 24.
  • An elastic return means 255 and a transplanting pipe 256 provided with a restriction 257 oppose the hydraulic control 254, the transplanting line taking the pressure at the level of the third port
  • the proportional valve 25 is controlled in a proportional manner between a first configuration in which the first port 251 is closed and the second port 252 is connected to the third port 253, and a second configuration in which the first port 251 is connected to the third orifice 253 and the second orifice 252 is closed.
  • the pressure delivered to the third port 253 is therefore proportional to the pressure applied by the hydraulic control 254.
  • the pressure delivered to the third port is the control pressure Pc measured by the control pressure sensor 420.
  • the computer 400 will thus control the electrical controls 134, 234 and 244 respectively of the additional control valve 13, of the all-or-nothing solenoid valve 23 and of the proportional solenoid valve 24 in order to achieve the fall of pressure in the control line 200 and in the additional line 100 if, when one of the brake actuators 310 and / or 320 is actuated, and after execution of a time delay, the pressure Pc in the control line 200 does not reach a pressure threshold value as already described above.
  • the electrical control 134 is actuated, the electrical control 234 remains actuated, while the electrical control 244 is deactivated in order to achieve the pressure drop in the control line 200 and in the additional line 100 .
  • this embodiment makes it possible to provide power to the control line 200 and to the additional line 100 even in the event of an electrical failure of the system, and in particular makes it possible to maintain a variable braking function, although degraded compared to normal operation, even in the event of an electrical failure, by controlling the proportional valve 25 directly by means of the brake pressure Pf.
  • FIG. 4 shows a variant of this embodiment.
  • the additional pressure source 110 and the control pressure source 210 presented previously in FIG. 1 are one and the same pressure source, here a hydraulic pump designated by the reference 510.
  • the pressure source 510 is associated with a pressure limiter 512 adapted to discharge an excess of pressure beyond a threshold pressure value in a R.
  • the brake pressure source 301 is removed, the brake control 300 is here supplied by the pressure source 510; a single fluid is used here, taken from a single reservoir R.

Abstract

The invention relates to a method for controlling a hydraulic braking system of a vehicle (V) comprising a control line (200) and an additional line (100), wherein (E1) a brake control (300) is actuated, (E2) the actuation of the brake control (300) is detected, (E3) a time delay is triggered and (E4) a control valve (220) is controlled so as to supply a control pressure (Pc) to the control line (200), (E6) at the end of the time delay, if the measured control pressure (Pc) is below a threshold value, an additional valve (120) and the control valve (220) are controlled in such a way that the pressure supplied to the additional line (100) and the pressure in the control line (200) are zero.

Description

Titre de l'invention : Système hydraulique et procédé associé pour la détection d'une fuite dans la conduite de commande. Title of the invention: Hydraulic system and associated method for detecting a leak in the control line.
Domaine Technique Technical area
[0001] La présente invention concerne le domaine des circuits de freinage hydraulique, et trouve notamment une application pour les véhicules couplés à des remorques. The present invention relates to the field of hydraulic braking circuits, and in particular finds an application for vehicles coupled to trailers.
Technique antérieure Prior art
[0002] Les systèmes de freinage hydrauliques pour véhicules pouvant être munis d’un attelage, par exemple des tracteurs, comprennent une conduite hydraulique de commande et une conduite hydraulique supplémentaire reliant le véhicule à son attelage. [0002] Hydraulic braking systems for vehicles which can be fitted with a hitch, for example tractors, comprise a hydraulic control line and an additional hydraulic line connecting the vehicle to its hitch.
[0003] La conduite de commande est pilotée par l’utilisateur, en fonction d’une consigne de freinage qu’il applique, par exemple en appuyant sur une pédale de frein de service du véhicule qui forme une commande de freinage du véhicule. [0003] The control line is controlled by the user, as a function of a braking instruction that he applies, for example by pressing a vehicle service brake pedal which forms a vehicle braking control.
[0004] La conduite supplémentaire est quant à elle typiquement alimentée en pression par une pompe délivrant une pression fixe et relativement faible. [0004] The additional pipe is itself typically supplied with pressure by a pump delivering a fixed and relatively low pressure.
[0005] La règlementation UE 2015/68 impose notamment qu’en cas de défaillance dans la conduite de commande, la pression dans la conduite supplémentaire doit tomber à 1000 kPa dans les deux secondes qui suivent le moment où la commande du frein de service a été actionnée et ensuite chute jusqu’à la pression ambiante ou 0 kPa. [0005] EU regulation 2015/68 requires in particular that in the event of a failure in the control line, the pressure in the additional line must drop to 1000 kPa within two seconds of the moment when the service brake control has actuated and then drops to ambient pressure or 0 kPa.
[0006] Cette règlementation pose donc de nouvelles problématiques de détection de fuite dans la conduite de commande et de modulation du pilotage du freinage en cas de défaillance. [0006] This regulation therefore poses new problems of detecting leaks in the control line and modulating the braking control in the event of failure.
Exposé de l’invention Disclosure of the invention
[0007] Le présent exposé vise ainsi à répondre au moins partiellement à ces problématiques, et propose un système de freinage hydraulique pour un véhicule comprenant une conduite de commande et une conduite supplémentaire adaptées pour être reliées à un système de freinage hydraulique d’un attelage, le système comprenant [0007] The present disclosure thus aims to respond at least partially to these problems, and proposes a hydraulic braking system for a vehicle comprising a control line and an additional line adapted to be connected to a hydraulic braking system of a coupling , the system including
- une commande de freinage adaptée pour être actionnée par un utilisateur de manière à délivrer une pression de freinage, - a braking control adapted to be actuated by a user so as to deliver a braking pressure,
- une valve de commande recevant électroniquement une consigne d'initialisation constante, typiquement prédéterminée , de manière à délivrer une pression de commande minimum à la conduite de commande, le système de freinage étant caractérisé en ce qu’il comprend en outre - a control valve electronically receiving a constant initialization setpoint, typically predetermined, so as to deliver a minimum control pressure to the control line, the braking system being characterized in that it further comprises
- un capteur de pression de commande, configuré de manière à mesurer la pression de commande, - a control pressure sensor, configured to measure the control pressure,
- un capteur de commande de freinage, configuré de manière à détecter un actionnement de la commande de freinage - a brake control sensor, configured to detect an actuation of the brake control
- un calculateur, configuré de manière à lors de la détection d’un actionnement de la commande de freinage, déclencher une temporisation à l’issue de laquelle la pression de commande mesurée est comparée avec une valeur seuil de pression de commande, si la pression de commande mesurée est inférieure à la valeur seuil de pression de commande, le calculateur pilote une valve supplémentaire de manière à ce que la pression délivrée à la conduite supplémentaire soit nulle, et pilote la valve de commande de manière à ce que la pression dans la conduite de commande soit nulle. - a computer, configured in such a way as to trigger an actuation of the braking control, triggering a time delay at the end of which the measured control pressure is compared with a control pressure threshold value, if the pressure measured control pressure is less than the control pressure threshold value, the computer controls an additional valve so that the pressure delivered to the additional line is zero, and controls the control valve so that the pressure in the control line is zero.
[0008] Selon un exemple, le capteur de commande de freinage est un potentiomètre, un capteur de position, un manocontact ou un capteur de pression associé à la commande de freinage. [0008] According to one example, the brake control sensor is a potentiometer, a position sensor, a pressure switch or a pressure sensor associated with the brake control.
[0009] Selon un exemple, le calculateur est configuré de manière à définir la consigne d'initialisation constante et la valeur seuil de pression de commande en fonction de la température du fluide du système hydraulique, de la vitesse de rotation nominale d’un moteur primaire du véhicule, et de la cylindrée d’une pompe hydraulique du véhicule, ou de manière alternative, en fonction du débit de la pompe hydraulique qui en est la résultante. [0009] According to one example, the computer is configured so as to define the constant initialization setpoint and the control pressure threshold value as a function of the temperature of the fluid of the hydraulic system, of the nominal speed of rotation of an engine primary vehicle, and the displacement of a hydraulic pump of the vehicle, or alternatively, depending on the flow of the resulting hydraulic pump.
[0010] Selon un exemple, la consigne d'initialisation constante, qui déterminera la pression de commande minimum, est comprise entre 10 et 40 bar, ou par exemple entre 12 et 18 bar et la valeur seuil de pression de commande est comprise entre 10bar et 15 bar. According to one example, the constant initialization setpoint, which will determine the minimum control pressure, is between 10 and 40 bar, or by example between 12 and 18 bar and the control pressure threshold value is between 10 bar and 15 bar.
[0011] Selon un exemple, la temporisation a une durée comprise entre 0,6 et 1 ,5 seconde. According to one example, the time delay has a duration of between 0.6 and 1.5 seconds.
[0012] Procédé de pilotage d’un système de freinage hydraulique d’un véhicule comprenant une conduite de commande et une conduite supplémentaire adaptées pour être reliées à un système de freinage hydraulique d’un attelage, dans lequel [0012] A method of controlling a hydraulic braking system of a vehicle comprising a control line and an additional line adapted to be connected to a hydraulic braking system of a coupling, in which
- on actionne une commande de freinage de manière à délivrer une pression de freinage, - a braking control is actuated so as to deliver a braking pressure,
- on détecte l’actionnement de la commande de freinage, - the actuation of the brake control is detected,
- on déclenche une temporisation et on fournit une consigne d'initialisation constante, typiquement prédéterminée, à une valve de commande au moyen d’une commande électronique, de manière à délivrer une pression de commande minimum à la conduite de commande, - a time delay is triggered and a constant initialization setpoint, typically predetermined, is supplied to a control valve by means of an electronic control, so as to deliver a minimum control pressure to the control line,
- à l’issue de la temporisation, on compare une mesure de la pression de commande à une valeur seuil de pression de commande, si la pression de commande mesurée est inférieure à la valeur seuil de pression de commande, on pilote une valve supplémentaire de manière à ce que la pression délivrée à la conduite supplémentaire soit nulle, et on pilote la valve de commande de manière à ce que la pression dans la conduite de commande soit nulle. - at the end of the time delay, a measurement of the control pressure is compared to a control pressure threshold value, if the measured control pressure is less than the control pressure threshold value, an additional valve is piloted. so that the pressure delivered to the additional line is zero, and the control valve is piloted so that the pressure in the control line is zero.
[0013] Selon un exemple, la temporisation a une durée comprise entre 0,6 et 1 ,5 seconde, ou entre 0,6 et 1 seconde. According to one example, the time delay has a duration of between 0.6 and 1.5 seconds, or between 0.6 and 1 second.
[0014] Selon un exemple, la consigne d'initialisation constante est comprise entre 10 et 40 bar, ou par exemple entre 12 et 18 bar et la valeur seuil de pression de commande est comprise entre 10 bar et 15 bar. According to one example, the constant initialization setpoint is between 10 and 40 bar, or for example between 12 and 18 bar and the control pressure threshold value is between 10 bar and 15 bar.
[0015] Selon un exemple, on définit, la consigne d'initialisation constante et la valeur de seuil de pression de commande en fonction de la température du fluide du système hydraulique, du régime de fonction d’un moteur primaire du véhicule, et de la cylindrée d’une pompe hydraulique du véhicule. [0016] Selon un exemple, si la pression de commande mesurée est supérieure à ladite valeur seuil de pression de commande, on pilote la valve de commande au moyen d’un calculateur de manière à ce que la pression de commande soit proportionnelle à la pression de freinage. According to one example, the constant initialization setpoint and the control pressure threshold value are defined as a function of the temperature of the fluid of the hydraulic system, of the operating speed of a primary engine of the vehicle, and of the displacement of a hydraulic pump of the vehicle. According to one example, if the measured control pressure is greater than said control pressure threshold value, the control valve is controlled by means of a computer so that the control pressure is proportional to the pressure braking.
Brève description des dessins Brief description of the drawings
[0017] L’invention et ses avantages seront mieux compris à la lecture de la description détaillée faite ci-après de différents modes de réalisation de l’invention donnés à titre d’exemples non limitatifs. The invention and its advantages will be better understood on reading the detailed description given below of various embodiments of the invention given by way of non-limiting examples.
[0018] [Fig. 1 ] la figure 1 représente un exemple de circuit selon un aspect de l’invention. [0018] [Fig. 1] Figure 1 shows an example of a circuit according to one aspect of the invention.
[0019] [Fig. 2] la figure 2 illustre schématiquement un procédé selon un aspect de l’invention. [0019] [Fig. 2] Figure 2 schematically illustrates a method according to one aspect of the invention.
[0020] [Fig. 3] la figure 3 présente une autre variante du circuit représenté sur la figure 1. [0020] [Fig. 3] Figure 3 shows another variant of the circuit shown in Figure 1.
[0021] [Fig. 4] la figure 4 présente une autre variante du circuit représenté sur la figure 1. [0021] [Fig. 4] Figure 4 shows another variant of the circuit shown in Figure 1.
[0022] Sur l’ensemble des figures, les éléments en commun sont repérés par des références numériques identiques. [0022] In all of the figures, the elements in common are identified by identical reference numerals.
Description des modes de réalisation Description of the embodiments
[0023] La figure 1 présente un système selon un aspect de l’invention. [0023] Figure 1 shows a system according to one aspect of the invention.
[0024] On représente schématiquement sur cette figure un véhicule V muni d’un système hydraulique comprenant une conduite supplémentaire 100 et une conduite de commande 200. Schematically shown in this figure a vehicle V provided with a hydraulic system comprising an additional line 100 and a control line 200.
[0025] La conduite supplémentaire 100 est reliée à un connecteur supplémentaire 102, et la conduite de commande est reliée à un connecteur de commande 202, lesdits connecteurs 102 et 202 étant adaptée pour être reliés à un circuit hydraulique d’attelage comme défini dans le règlement UE 2015/68, comme par exemple le circuit hydraulique présenté dans la demande de brevet FR 3037023. The additional line 100 is connected to an additional connector 102, and the control line is connected to a control connector 202, said connectors 102 and 202 being adapted to be connected to a hydraulic coupling circuit as defined in EU regulation 2015/68, such as for example the hydraulic circuit presented in patent application FR 3037023.
[0026] La conduite supplémentaire 100 est alimentée par une source de pression supplémentaire 110, associée à une valve supplémentaire 120 permettant de piloter la pression au sein de la conduite supplémentaire 100 et délivrée au connecteur supplémentaire 102. The additional pipe 100 is supplied by an additional pressure source 110, associated with an additional valve 120 making it possible to control the pressure within the additional pipe 100 and delivered to the additional connector 102.
[0027] La conduite de commande 200 est alimentée par une source de pression de commande 210, associée à une valve de commande 220 permettant de piloter la pression au sein de la conduite de commande 200 et délivrée au connecteur de commande 202. The control line 200 is supplied by a control pressure source 210, associated with a control valve 220 making it possible to control the pressure within the control line 200 and delivered to the control connector 202.
[0028] Dans l’exemple représenté sur la figure 1 , la source de pression supplémentaire 110 et la source de pression de commande 210 sont distinctes. En variante, il peut s’agir d’une même source de pression, le fonctionnement étant alors inchangé. In the example shown in Figure 1, the additional pressure source 110 and the control pressure source 210 are separate. As a variant, it may be the same source of pressure, the operation then being unchanged.
[0029] Le véhicule V comprend un calculateur 400, que l’on désigne de manière commune par l’acronyme en langue anglaise ECU (Electronic Control Unit) ou unité de contrôle électronique. The vehicle V comprises a computer 400, which is commonly referred to by the acronym in English as ECU (Electronic Control Unit) or electronic control unit.
[0030] Le véhicule V comprend également une commande de freinage 300, typiquement un actionneur tel qu’une pédale de frein pilotée directement par l’utilisateur, de manière à appliquer une pression de freinage Pf. La valve de commande 220 est pilotée par le calculateur 400, de sorte qu’en fonctionnement stable, une pression de commande Pc délivrée par la valve de commande 220 à la conduite de commande 200 soit fonction de la pression de freinage Pf. The vehicle V also comprises a braking control 300, typically an actuator such as a brake pedal controlled directly by the user, so as to apply a brake pressure Pf. The control valve 220 is controlled by the computer 400, so that in stable operation, a control pressure Pc delivered by the control valve 220 to the control pipe 200 is a function of the braking pressure Pf.
[0031] Le calculateur 400 est associé à un capteur de pression de commande 420 configuré de manière à mesurer la pression de commande Pc et à un capteur de commande 430 configuré de manière à détecter un actionnement de la commande de freinage 300. The computer 400 is associated with a control pressure sensor 420 configured so as to measure the control pressure Pc and with a control sensor 430 configured so as to detect an actuation of the brake control 300.
[0032] Le calculateur 400 reçoit ainsi du capteur de pression de commande 420 et du capteur de commande 430 des informations relatives à la valeur de la pression de commande Pc et à l’actionnement de la commande de freinage 300. [0032] The computer 400 thus receives from the control pressure sensor 420 and from the control sensor 430 information relating to the value of the control pressure Pc and to the actuation of the brake control 300.
[0033] Le capteur de commande 430 peut par exemple être un interrupteur couplé à la commande de freinage 300, un potentiomètre, un capteur de pression détectant une variation de pression en sortie de la commande de freinage 300, un manocontact, un capteur de position, ou tout autre capteur adapté pour détecter une variation d’état ou de position de la commande de freinage 300. [0034] Lorsque l’utilisateur actionne la commande de freinage 300, le capteur de commande 430 délivre ainsi une information au calculateur 400 signalant l’initiation d’une commande de freinage. Le calculateur 400 initie alors une temporisation ayant une durée TO typiquement comprise entre 0,6 et 1 ,5 seconde, ou plus précisément comprise entre 0,6 et 0,8 seconde, ou entre 0,6 et 1 seconde. Lors de cette première étape, la valve de commande 220 est pilotée par le calculateur 400 pour délivrer une pression de commande Pc prédéterminée à la conduite de commande 200. Cette pression de commande Pc délivrée lors de cette première étape est typiquement délivrée selon une consigne d’initialisation, qui est par exemple constante et prédéterminée, et n’est pas proportionnelle à la pression de freinage Pf. La consigne d’initialisation fournie par le calculateur 400 conduit typiquement à une pression de commande Pc ayant une valeur différente de la pression souhaitée dans la ligne de commande lorsque le système est dans des conditions normales d’utilisation. The control sensor 430 can for example be a switch coupled to the braking control 300, a potentiometer, a pressure sensor detecting a pressure variation at the output of the braking control 300, a pressure switch, a position sensor , or any other sensor suitable for detecting a variation of the state or position of the braking control 300. When the user actuates the braking control 300, the control sensor 430 thus delivers information to the computer 400 signaling the initiation of a braking control. The computer 400 then initiates a time delay having a duration TO typically between 0.6 and 1.5 seconds, or more precisely between 0.6 and 0.8 seconds, or between 0.6 and 1 second. During this first step, the control valve 220 is controlled by the computer 400 to deliver a predetermined control pressure Pc to the control pipe 200. This control pressure Pc delivered during this first step is typically delivered according to a set point d 'initialization, which is for example constant and predetermined, and is not proportional to the braking pressure Pf. The initialization setpoint supplied by the computer 400 typically leads to a control pressure Pc having a value different from the desired pressure in the command line when the system is under normal operating conditions.
[0035] A l’issue de la temporisation, le calculateur 400 compare la pression de commande Pc mesurée par le capteur de pression de commande 420 avec une valeur seuil de pression. La comparaison est typiquement réalisée à l’issue de la temporisation, de sorte qu’entre l’initiation de la temporisation et la fin de la comparaison, le temps écoulé soit inférieur à 1 seconde. [0035] At the end of the time delay, the computer 400 compares the control pressure Pc measured by the control pressure sensor 420 with a pressure threshold value. The comparison is typically performed at the end of the timer, so that between the initiation of the timer and the end of the comparison, the elapsed time is less than 1 second.
[0036] Si la pression de commande Pc mesurée est supérieure à la valeur seuil de pression de commande, alors le calculateur 400 détermine que le système présente un fonctionnement régulier ou normal (ou plus généralement qu’il n’est pas défaillant). Dans ce cas, la valve de commande 220 est alors typiquement pilotée par le calculateur 400 de manière à délivrer une pression de commande Pc proportionnelle à la pression de freinage Pf. La valve supplémentaire 120 est alors également typiquement pilotée par le calculateur 400 de manière à délivrer une pression supplémentaire Ps non nulle. Si la pression de commande Pc mesurée est inférieure à la valeur seuil de pression de commande, alors le calculateur 400 détermine qu’il y a une fuite ou une panne dans le circuit. Le calculateur 400 pilote la valve supplémentaire 120 de manière à ce que la pression délivrée à la conduite supplémentaire 100 soit nulle, et pilote la valve de commande 220 de manière à ce que la pression dans la conduite de commande 200 soit nulle. Par pilotage des valves, on entend que le calculateur 400 va par exemple engager ou désengager une commande électrique de la valve supplémentaire 120 et/ou de la valve de commande 220. Le pilotage de la valve supplémentaire 120 et de la valve de commande 220 est typiquement réalisé de manière à ce que la pression nulle dans la conduite de commande 200 et dans la conduite supplémentaire 100 soit établie alors qu’une durée inférieure à 2 seconde s’est écoulée depuis l’actionnement de la commande de freinage 300 (et donc depuis l’initiation de la temporisation). If the measured control pressure Pc is greater than the control pressure threshold value, then the computer 400 determines that the system has regular or normal operation (or more generally that it is not faulty). In this case, the control valve 220 is then typically controlled by the computer 400 so as to deliver a control pressure Pc proportional to the braking pressure Pf. The additional valve 120 is then also typically controlled by the computer 400 so as to deliver an additional non-zero pressure Ps. If the measured control pressure Pc is less than the control pressure threshold value, then the computer 400 determines that there is a leak or a fault in the circuit. The computer 400 controls the additional valve 120 so that the pressure delivered to the additional line 100 is zero, and controls the control valve 220 so that the pressure in the control line 200 is zero. By control of the valves, it is meant that the computer 400 goes by example engage or disengage an electric control of the additional valve 120 and / or of the control valve 220. The control of the additional valve 120 and of the control valve 220 is typically carried out so that the zero pressure in the pipe control 200 and in the additional pipe 100 is established while a period of less than 2 seconds has elapsed since the actuation of the braking control 300 (and therefore since the initiation of the time delay).
[0037] La valeur seuil de pression de commande peut être une valeur prédéterminée, ou être établie par le calculateur 400 par exemple en fonction de différents critères. Par exemple, la valeur seuil de pression de commande peut être établie par le calculateur 400 en fonction de la température du fluide du système hydraulique ou de la température ambiante, d’un régime de fonctionnement d’un moteur primaire du véhicule V, ou de la cylindrée d’une pompe hydraulique du système hydraulique. La consigne d’initialisation constante fournie par le calculateur 400 à la valve de commande 220 pour délivrer une pression de commande Pc à la conduite de commande 200 correspond typiquement à la valeur de seuil de pression de commande à une marge d’erreur près , par exemple de l’ordre de 10% à 20% , la consigne d’initialisation étant toujours supérieure à la valeur de seuil. De manière plus générale, les valeurs de la consigne d’initialisation et de la valeur seuil de pression de commande sont liées. On détermine dans un premier temps l’une ou l’autre de ces valeurs, puis on applique une marge, typiquement de 10% à 20% afin de déterminer l’autre de ces valeurs, la consigne d’initialisation étant toujours supérieure à la valeur de seuil. [0038] La valeur seuil de pression est typiquement comprise entre 10 bar et 15 bar ou entre 10 bar et 40 bar suivant les critères de température de vitesse et de cylindrée de pompe. The control pressure threshold value can be a predetermined value, or be established by the computer 400 for example according to different criteria. For example, the control pressure threshold value can be established by the computer 400 as a function of the temperature of the fluid of the hydraulic system or of the ambient temperature, of an operating speed of a primary engine of the vehicle V, or of the displacement of a hydraulic pump in the hydraulic system. The constant initialization setpoint supplied by the computer 400 to the control valve 220 to deliver a control pressure Pc to the control pipe 200 typically corresponds to the control pressure threshold value within a margin of error, for example example of the order of 10% to 20%, the initialization setpoint always being greater than the threshold value. More generally, the values of the initialization setpoint and of the control pressure threshold value are linked. One or the other of these values is first determined, then a margin is applied, typically from 10% to 20% in order to determine the other of these values, the initialization setpoint always being greater than the threshold value. The pressure threshold value is typically between 10 bar and 15 bar or between 10 bar and 40 bar depending on the temperature, speed and pump displacement criteria.
[0039] Ainsi, le système tel que présenté permet de détecter plusieurs types de défaillances en contrôlant la vitesse d’établissement d’une pression souhaitée dans la conduite de commande 200. Le système tel que présenté permet notamment de détecter une défaillance sur la valve de commande 220, sur la source de pression alimentant la conduite de commande 200, ou plus généralement toute fuite sur un flexible ou un conduit de la conduite de commande 200. Plus généralement, le système tel que présenté permet de réaliser une étape préliminaire de test lors de laquelle on vérifie si le système est en mesure de délivrer une pression donnée. Un échec à ce test est interprété comme une défaillance du système. Thus, the system as presented makes it possible to detect several types of failures by controlling the rate of establishment of a desired pressure in the control line 200. The system as presented makes it possible in particular to detect a failure on the valve. control 220, on the pressure source supplying the control pipe 200, or more generally any leak on a flexible or a pipe of the control pipe. control 200. More generally, the system as presented makes it possible to carry out a preliminary test step during which it is checked whether the system is able to deliver a given pressure. Failure of this test is interpreted as a system failure.
[0040] Selon un exemple, dans le cas où le calculateur 400 détermine que le système présente un fonctionnement régulier ou normal (ou plus généralement qu’il n’est pas défaillant), le calculateur 400 peut alors basculer sur un contrôle continu de la pression au sein de la conduite de commande 200 dès que l’on détecte l’actionnement de la commande de freinage 300 de manière à s’assurer qu’elle ne descend pas en dessous d’une valeur seuil basse, ce qui traduirait alors une défaillance du système intervenue lors de son fonctionnement. Dans le cas où la pression mesurée descend en dessous de cette valeur seuil basse, le calculateur 400 peut alors délivrer un message d’erreur à destination d’un utilisateur du véhicule. According to one example, in the case where the computer 400 determines that the system has regular or normal operation (or more generally that it is not faulty), the computer 400 can then switch to continuous monitoring of the pressure within the control line 200 as soon as the actuation of the braking control 300 is detected so as to ensure that it does not drop below a low threshold value, which would then reflect a system failure during operation. In the event that the measured pressure drops below this low threshold value, the computer 400 can then deliver an error message to a user of the vehicle.
[0041] L’étape préliminaire de test décrite précédemment est donc suivie d’une surveillance du système en fonctionnement. The preliminary test step described above is therefore followed by monitoring of the system in operation.
[0042] A titre d’exemple, la valeur seuil basse peut être de l’ordre de 10 bar, si on considère que la valeur seuil employée lors de l’étape préliminaire de test est comprise entre 10 bar et 15 bar. [0042] For example, the low threshold value may be of the order of 10 bar, if we consider that the threshold value used during the preliminary test step is between 10 bar and 15 bar.
[0043] La figure 2 représente schématiquement un procédé selon un aspect de l’invention associé au circuit représenté précédemment en référence à la figure 1. [0043] Figure 2 schematically shows a method according to an aspect of the invention associated with the circuit shown above with reference to Figure 1.
[0044] On représente sur cette figure les étapes suivantes : The following steps are shown in this figure:
[0045] E1 : Etape d’application d’une consigne de freinage par l’utilisateur via la commande de freinage 300. Il s’agit par exemple de l’application d’une consigne de freinage par un utilisateur par exemple par actionnement d’une pédale de frein ou d’une commande de frein. E1: Step of application of a braking instruction by the user via the braking control 300. This is for example the application of a braking instruction by a user, for example by actuating d 'a brake pedal or brake control.
[0046] E2 : Etape de détection de la commande via le capteur de commande 430. Le capteur 430 détecte un changement d’état ou de position de la commande de freinage 300. E2: Control detection step via the control sensor 430. The sensor 430 detects a change of state or position of the brake control 300.
[0047] E3 : Etape d’initiation d’une temporisation. Le calculateur 400 déclenche une temporisation ayant une durée TO comme indiqué précédemment. [0048] E4 : Etape d’établissement d’une pression de commande Pc dans la conduite de commande 200 par la source de pression de commande 210 et la valve de commande 220, la pression de commande Pc étant ici typiquement établie selon une consigne d'initialisation constante prédéterminée, indépendamment de la valeur de la pression de freinage Pf. E3: Step for initiating a timer. The computer 400 triggers a time delay having a duration TO as indicated above. E4: Step of establishing a control pressure Pc in the control line 200 by the control pressure source 210 and the control valve 220, the control pressure Pc here typically being established according to a setpoint d 'predetermined constant initialization, regardless of the value of the brake pressure Pf.
[0049] E5 : Etape de mesure de la pression de commande Pc dans la conduite de commande 200 à l’issue de la temporisation initiée lors de l’étape E3. E5: Step of measuring the control pressure Pc in the control line 200 at the end of the time delay initiated in step E3.
[0050] E6 : Etape de comparaison de la pression de commande Pc mesurée avec une valeur seuil de pression, ladite valeur seuil de pression correspond typiquement à la consigne d’initialisation constante, typiquement à 10% près ou à 20% près. E6: Comparison step of the measured control pressure Pc with a pressure threshold value, said pressure threshold value typically corresponds to the constant initialization setpoint, typically within 10% or within 20%.
[0051] E7 : Etape de diagnostic ; le calculateur 400 pilote le circuit hydraulique en fonction du résultat de l’étape E6 de comparaison. E7: Diagnostic step; the computer 400 controls the hydraulic circuit as a function of the result of the comparison step E6.
[0052] A titre d’exemple, lors de l’étape E4, le calculateur 400 peut piloter la valve de commande 220 en lui fournissant une consigne supposée conduire à l’établissement d’une pression de 48 bar (ou 18 bar) dans la conduite de commande 200. La valeur seuil de pression peut alors être égale à 40 bar (ou 1500 kPa). Ainsi, si la pression établie dans la conduite de commande 200 n’atteint pas 40 bar (ou 15 bar) à l’issue de la temporisation, le calculateur 400 détermine que le système présente une défaillance. By way of example, during step E4, the computer 400 can control the control valve 220 by providing it with a set point supposed to lead to the establishment of a pressure of 48 bar (or 18 bar) in the control line 200. The pressure threshold value can then be equal to 40 bar (or 1500 kPa). Thus, if the pressure established in the control line 200 does not reach 40 bar (or 15 bar) at the end of the time delay, the computer 400 determines that the system has a fault.
[0053] Le temps s’écoulant entre les étapes E1 et la fin de l’étape E6 est typiquement inférieur à 1 seconde. The time elapsing between steps E1 and the end of step E6 is typically less than 1 second.
[0054] Dans le cas où le calculateur 400 détermine la valeur seuil de pression de commande et la consigne d'initialisation constante, cela peut par exemple être réalisée lors de l’étape E3. Le calculateur 400 recueille alors les informations requises pour la détermination de la consigne d'initialisation constante et la valeur seuil de pression, par exemple la température ambiante ou la température du fluide dans le système hydraulique, la cylindrée d’une pompe du système hydraulique et/ou le régime de fonctionnement d’un moteur primaire du véhicule, et définit la consigne d'initialisation constante et la valeur seuil de pression de commande. [0055] Les figures 3 et 4 présentent deux modes de réalisation détaillés du système déjà décrit en référence à la figure 1. In the case where the computer 400 determines the control pressure threshold value and the constant initialization setpoint, this can for example be carried out during step E3. The computer 400 then collects the information required for determining the constant initialization setpoint and the pressure threshold value, for example the ambient temperature or the temperature of the fluid in the hydraulic system, the displacement of a pump of the hydraulic system and / or the operating speed of a primary engine of the vehicle, and defines the constant initialization setpoint and the control pressure threshold value. Figures 3 and 4 show two detailed embodiments of the system already described with reference to Figure 1.
[0056] On décrit ci-après un premier mode de réalisation en référence à la figure 3. A first embodiment is described below with reference to FIG. 3.
[0057] La commande de freinage 300 est ici détaillée. Elle comprend deux actionneurs de freinage 310 et 320, pilotant chacun un frein, respectivement 315 et 325, pour un côté (droite ou gauche) du véhicule V. Une telle structure de commande de freinage est notamment employée pour les véhicules agricoles, et permet de faciliter les virages. On comprend que l’invention s’applique également pour une commande de freinage 300 ayant un actionneur de freinage unique pour les deux côtés d’un véhicule, l’exemple de commande de freinage 300 illustré étant purement illustratif et non limitatif. The braking control 300 is detailed here. It comprises two brake actuators 310 and 320, each controlling a brake, respectively 315 and 325, for one side (right or left) of the vehicle V. Such a brake control structure is used in particular for agricultural vehicles, and makes it possible to facilitate turns. It is understood that the invention also applies to a brake control 300 having a single brake actuator for both sides of a vehicle, the example of brake control 300 illustrated being purely illustrative and not limiting.
[0058] Les actionneurs de freinage 310 et 320 sont chacun reliés à une source de pression de freinage 301 et à un premier réservoir R1 dans lequel la source de pression de freinage 301 prélève un premier fluide. On comprend que cet exemple n’est pas limitatif ; l’Invention s’applique également à des actionneurs autonomes en fluide tels que des maitres cylindres. The brake actuators 310 and 320 are each connected to a brake pressure source 301 and to a first reservoir R1 in which the brake pressure source 301 takes a first fluid. It is understood that this example is not limiting; The invention is also applicable to fluid autonomous actuators such as master cylinders.
[0059] La commande de freinage 300 comprend un sélecteur de haute pression 330, de sorte que la pression en sortie de la commande de freinage 300, c’est-à-dire la pression de freinage Pf, correspond à la pression la plus élevée parmi celle délivrée par les actionneurs de freinage 310 et 320. Le capteur de commande 430 détecte ainsi typiquement un déplacement ou un changement d’état des actionneurs de freinage 310 et/ou 320, ou une variation de pression au niveau du sélecteur de haute pression 330 ou dans la conduite reliant le sélecteur de haute pression 330 au premier orifice 231 de l’électrovalve tout ou rien 23. [0060] Dans le mode de réalisation représenté, la source de pression supplémentaire 110 et la source de pression de commande 210 sont une seule et même source de pression, ici une pompe hydraulique désignée par la référence 510. The brake control 300 comprises a high pressure selector 330, so that the pressure at the output of the brake control 300, that is to say the brake pressure Pf, corresponds to the highest pressure among that delivered by the brake actuators 310 and 320. The control sensor 430 thus typically detects a displacement or a change of state of the brake actuators 310 and / or 320, or a pressure variation at the high pressure selector. 330 or in the line connecting the high pressure selector 330 to the first port 231 of the all-or-nothing solenoid valve 23. In the embodiment shown, the additional pressure source 110 and the control pressure source 210 are a single source of pressure, here a hydraulic pump designated by the reference 510.
[0061] La source de pression 510 est associée à un limiteur de pression 512 adapté pour décharger un excédent de pression au-delà d’une valeur seuil de pression dans un second réservoir R2 dans lequel la source de pression 510 prélève un second fluide. [0062] La valve supplémentaire 120 telle que représentée comprend deux valves ; une valve supplémentaire de pilotage 13 et une valve supplémentaire de puissance 14. The pressure source 510 is associated with a pressure limiter 512 adapted to discharge an excess of pressure beyond a pressure threshold value in a second reservoir R2 in which the pressure source 510 takes a second fluid. The additional valve 120 as shown comprises two valves; an additional pilot valve 13 and an additional power valve 14.
[0063] La valve supplémentaire de pilotage 13 comprend un premier orifice 131 relié à la source de pression 510, un second orifice 132 relié au second réservoir R2, et un troisième orifice 133. On comprend que le circuit proposé sur la figure 3 permet d’employer des fluides distincts pour la commande de freinage 300 d’une part, et pour la conduite supplémentaire 100 et la conduite de commande 200 d’autre part. Dans le cas où un même fluide est employé, les pompes hydrauliques 301 et 510 peuvent être une même et unique pompe, et les réservoirs R1 et R2 peuvent être un même réservoir. The additional pilot valve 13 comprises a first port 131 connected to the pressure source 510, a second port 132 connected to the second reservoir R2, and a third port 133. It is understood that the circuit proposed in Figure 3 allows 'use separate fluids for the brake control 300 on the one hand, and for the additional line 100 and the control line 200 on the other hand. In the case where the same fluid is used, the hydraulic pumps 301 and 510 can be one and the same pump, and the reservoirs R1 and R2 may be the same reservoir.
[0064] La valve supplémentaire de pilotage 13 est pilotée par une commande électrique 134 reliée au calculateur 400, à laquelle s’opposent un moyen de rappel élastique 135 et une conduite de repiquage 136 munie d’une restriction 137 prélevant la pression au niveau du troisième orifice 133. The additional control valve 13 is controlled by an electrical control 134 connected to the computer 400, which is opposed by an elastic return means 135 and a transplanting pipe 136 provided with a restriction 137 taking the pressure off at the level of the third port 133.
[0065] La valve supplémentaire de pilotage 13 alterne ainsi entre une première configuration dans laquelle le premier orifice 131 est obturé et le deuxième orifice 132 est relié au troisième orifice 133, et une seconde configuration dans laquelle le premier orifice 131 est relié au troisième orifice 133 et le deuxième orifice 132 est obturé. La valve supplémentaire de pilotage 13 est par défaut (c’est-à-dire en l’absence de commande appliquée par la commande électrique 134) dans sa première configuration. La valve supplémentaire de pilotage 13 est une valve proportionnelle, de sorte que la pression à son troisième orifice 133 soit proportionnelle à la commande appliquée via la commande électrique 134. The additional pilot valve 13 thus alternates between a first configuration in which the first port 131 is closed and the second port 132 is connected to the third port 133, and a second configuration in which the first port 131 is connected to the third port 133 and the second orifice 132 is closed. The additional control valve 13 is by default (that is to say in the absence of control applied by the electric control 134) in its first configuration. The additional pilot valve 13 is a proportional valve, so that the pressure at its third port 133 is proportional to the control applied via the electric control 134.
[0066] A titre de variante la valve supplémentaire de pilotage 13 peut être une valve à 2 positions non proportionnelle (valve que l’on qualifie de « valve ON/OFF »). Dans ce cas la conduite de repiquage 136 et sa restriction 137 ne sont pas présentes. As a variant, the additional control valve 13 can be a non-proportional 2-position valve (valve referred to as an "ON / OFF valve"). In this case, the transplanting pipe 136 and its restriction 137 are not present.
[0067] La valve supplémentaire de puissance 14 comprend un premier orifice 141 relié à la source de pression 510, un second orifice 142 relié au second réservoir R2, et un troisième orifice 143 relié au connecteur supplémentaire 102. [0068] La valve supplémentaire de puissance 14 est pilotée par une commande hydraulique 144 reliée au troisième orifice 133 de la valve supplémentaire de pilotage 13 à laquelle s’oppose un moyen de rappel élastique 145. Une conduite de repiquage 146 munie d’une restriction 147 prélève la pression au niveau du troisième orifice 143 et vient l’appliquer en opposition au moyen de rappel élastique 145. The additional power valve 14 comprises a first port 141 connected to the pressure source 510, a second port 142 connected to the second reservoir R2, and a third port 143 connected to the additional connector 102. The additional power valve 14 is controlled by a hydraulic control 144 connected to the third orifice 133 of the additional control valve 13 which is opposed by an elastic return means 145. A transplanting line 146 provided with a restriction 147 takes the pressure at the level of the third orifice 143 and comes to apply it in opposition to the elastic return means 145.
[0069] La valve supplémentaire de puissance 14 est pilotée de manière proportionnelle entre une première configuration dans laquelle le premier orifice 141 est relié au troisième orifice 143 et le deuxième orifice 142 est obturé, et une seconde configuration dans laquelle le premier orifice 141 est obturé, et le deuxième orifice est relié au troisième orifice 143. The additional power valve 14 is controlled proportionally between a first configuration in which the first port 141 is connected to the third port 143 and the second port 142 is closed, and a second configuration in which the first port 141 is closed , and the second port is connected to the third port 143.
[0070] A titre de variante, la valve supplémentaire de puissance 14 peut être une valve à 2 positions non proportionnelle (valve que l’on qualifie de « valve ON/OFF » ou de valve tout ou rien). Dans ce cas la conduite de repiquage 136 et sa restriction 137 ne sont pas nécessaires et peuvent être supprimées. As a variant, the additional power valve 14 can be a non-proportional 2-position valve (valve that is referred to as an "ON / OFF valve" or an all-or-nothing valve). In this case, the transplanting line 136 and its restriction 137 are not necessary and can be omitted.
[0071] La valve de commande 220 telle que représentée comprend trois valves ; une électrovalve tout ou rien 23, une électrovalve proportionnelle 24, et une valve proportionnelle 25. The control valve 220 as shown comprises three valves; an all-or-nothing solenoid valve 23, a proportional solenoid valve 24, and a proportional valve 25.
[0072] L’électrovalve tout ou rien 23 est pilotée par une commande électrique 234 reliée au calculateur 400, à laquelle s’oppose un moyen de rappel élastique 235. Elle présente un premier orifice 231 reliée au sélecteur de haute pression 330, et un second orifice 232. L’électrovalve tout ou rien 23 est configurée pour être soit passante uniquement depuis son premier orifice vers son second orifice 232, soit passante uniquement depuis son second orifice 232 vers son premier orifice 233. [0073] L’électrovalve proportionnelle 24 comprend un premier orifice 241 reliée à la source de pression 510, un deuxième orifice 242 relié au second réservoir R2, et un troisième orifice 243. The all-or-nothing solenoid valve 23 is controlled by an electrical control 234 connected to the computer 400, which is opposed by an elastic return means 235. It has a first orifice 231 connected to the high pressure selector 330, and a second orifice 232. The all-or-nothing solenoid valve 23 is configured to either pass through only from its first port to its second port 232, or pass only from its second port 232 to its first port 233. [0073] The proportional solenoid valve 24 comprises a first port 241 connected to the pressure source 510, a second port 242 connected to the second reservoir R2, and a third port 243.
[0074] L’électrovalve proportionnelle 24 est pilotée par une commande électrique 244 reliée au calculateur 400, à laquelle s’opposent un moyen de rappel élastique 245 et une conduite de repiquage 246 prélevant la pression au niveau du troisième orifice 243 et munie d’une restriction 247. L’électrovanne proportionnelle 24 est pilotée de manière proportionnelle entre une première configuration dans laquelle le premier orifice 241 est obturé, et le deuxième orifice 242 est relié au troisième orifice 243, et une seconde configuration dans laquelle le premier orifice 241 est relié au troisième orifice 243, et le deuxième orifice 242 est obturé. The proportional solenoid valve 24 is controlled by an electrical control 244 connected to the computer 400, which is opposed by an elastic return means 245 and a transplanting pipe 246 taking the pressure at the level of the third orifice 243 and provided with ' a restriction 247. The proportional solenoid valve 24 is controlled in a proportional manner between a first a configuration in which the first port 241 is closed, and the second port 242 is connected to the third port 243, and a second configuration in which the first port 241 is connected to the third port 243, and the second port 242 is closed.
[0075] La valve proportionnelle 25 présente un premier orifice 251 relié à la source de pression 510, un deuxième orifice 252 relié au second réservoir R2, et un troisième orifice 253 relié au connecteur de commande 202. The proportional valve 25 has a first port 251 connected to the pressure source 510, a second port 252 connected to the second reservoir R2, and a third port 253 connected to the control connector 202.
[0076] La valve proportionnelle 25 est pilotée par une commande hydraulique 254, typiquement un vérin à double chambre, relié au deuxième orifice 232 de l’électrovalve tout ou rien 23 et au troisième orifice 243 de l’électrovalve proportionnelle 24, de manière à appliquer une commande correspondant à la pression la plus élevée entre la pression au niveau du deuxième orifice 232 de l’électrovalve tout ou rien 23 et du troisième orifice 243 de l’électrovalve proportionnelle 24. Un moyen de rappel élastique 255 et une conduite de repiquage 256 munie d’une restriction 257 s’opposent à la commande hydraulique 254, la conduite de repiquage prélevant la pression au niveau du troisième orifice 253. The proportional valve 25 is controlled by a hydraulic control 254, typically a double chamber cylinder, connected to the second port 232 of the on / off solenoid valve 23 and to the third port 243 of the proportional solenoid valve 24, so as to apply a command corresponding to the highest pressure between the pressure at the level of the second port 232 of the on / off solenoid valve 23 and the third port 243 of the proportional solenoid valve 24. An elastic return means 255 and a transplanting pipe 256 provided with a restriction 257 oppose the hydraulic control 254, the transplanting line taking the pressure at the level of the third port 253.
[0077] La valve proportionnelle 25 est pilotée de manière proportionnelle entre une première configuration dans laquelle le premier orifice 251 est obturé et le deuxième orifice 252 est relié au troisième orifice 253, et une seconde configuration dans laquelle le premier orifice 251 est relié au troisième orifice 253 et le deuxième orifice 252 est obturé. La pression délivrée au troisième orifice 253 est donc proportionnelle à la pression appliquée par la commande hydraulique 254. La pression délivrée au troisième orifice est la pression de commande Pc mesurée par le capteur de pression de commande 420. The proportional valve 25 is controlled in a proportional manner between a first configuration in which the first port 251 is closed and the second port 252 is connected to the third port 253, and a second configuration in which the first port 251 is connected to the third orifice 253 and the second orifice 252 is closed. The pressure delivered to the third port 253 is therefore proportional to the pressure applied by the hydraulic control 254. The pressure delivered to the third port is the control pressure Pc measured by the control pressure sensor 420.
[0078] En fonctionnement, le calculateur 400 va ainsi piloter les commandes électriques 134, 234 et 244 respectivement de la valve supplémentaire de pilotage 13, de l’électrovalve tout ou rien 23 et de l’électrovalve proportionnelle 24 afin de réaliser la chute de pression dans la conduite de commande 200 et dans la conduite supplémentaire 100 si lors de l’actionnement de l’un des actionneurs de freinage 310 et/ou 320, et après exécution d’une temporisation, la pression Pc dans la conduite de commande 200 n’atteint pas une valeur seuil de pression comme déjà décrit précédemment. In operation, the computer 400 will thus control the electrical controls 134, 234 and 244 respectively of the additional control valve 13, of the all-or-nothing solenoid valve 23 and of the proportional solenoid valve 24 in order to achieve the fall of pressure in the control line 200 and in the additional line 100 if, when one of the brake actuators 310 and / or 320 is actuated, and after execution of a time delay, the pressure Pc in the control line 200 does not reach a pressure threshold value as already described above.
[0079] Dans l’exemple illustré, la commande électrique 134 est actionnée, la commande électrique 234 reste actionnée, tandis que la commande électrique 244 est désactivée afin de réaliser la chute de pression dans la conduite de commande 200 et dans la conduite supplémentaire 100. In the example illustrated, the electrical control 134 is actuated, the electrical control 234 remains actuated, while the electrical control 244 is deactivated in order to achieve the pressure drop in the control line 200 and in the additional line 100 .
[0080] On note par ailleurs que ce mode de réalisation permet d’assurer une alimentation de la conduite de commande 200 et de la conduite supplémentaire 100 même en cas de défaillance électrique du système, et permet notamment de conserver une fonction de freinage variable, bien que dégradée par rapport à un fonctionnement normal, même en cas de panne électrique, en pilotant la valve proportionnelle 25 directement au moyen de la pression de freinage Pf. It should also be noted that this embodiment makes it possible to provide power to the control line 200 and to the additional line 100 even in the event of an electrical failure of the system, and in particular makes it possible to maintain a variable braking function, although degraded compared to normal operation, even in the event of an electrical failure, by controlling the proportional valve 25 directly by means of the brake pressure Pf.
[0081] La figure 4 présente une variante de ce mode de réalisation. Ici également, la source de pression supplémentaire 110 et la source de pression de commande 210 présentées précédemment sur la figure 1 sont une seule et même source de pression, ici une pompe hydraulique désignée par la référence 510. FIG. 4 shows a variant of this embodiment. Here also, the additional pressure source 110 and the control pressure source 210 presented previously in FIG. 1 are one and the same pressure source, here a hydraulic pump designated by the reference 510.
[0082] Comme pour le mode de réalisation déjà décrit en référence à la figure 3, la source de pression 510 est associée à un limiteur de pression 512 adapté pour décharger un excédent de pression au-delà d’une valeur seuil de pression dans un réservoir R. As for the embodiment already described with reference to FIG. 3, the pressure source 510 is associated with a pressure limiter 512 adapted to discharge an excess of pressure beyond a threshold pressure value in a R.
[0083] Dans ce mode de réalisation, la source de pression de freinage 301 est supprimée, la commande de freinage 300 est ici alimentée par la source de pression 510 ; un seul fluide est ici employé, prélevé dans un unique réservoir R. In this embodiment, the brake pressure source 301 is removed, the brake control 300 is here supplied by the pressure source 510; a single fluid is used here, taken from a single reservoir R.
[0084] Le fonctionnement demeure inchangé par rapport au mode de réalisation déjà décrit en référence aux figures précédentes. The operation remains unchanged from the embodiment already described with reference to the previous figures.
[0085] Bien que la présente invention ait été décrite en se référant à des exemples de réalisation spécifiques, il est évident que des modifications et des changements peuvent être effectués sur ces exemples sans sortir de la portée générale de l'invention telle que définie par les revendications. En particulier, des caractéristiques individuelles des différents modes de réalisation illustrés/mentionnés peuvent être combinées dans des modes de réalisation additionnels. Par conséquent, la description et les dessins doivent être considérés dans un sens illustratif plutôt que restrictif. Although the present invention has been described with reference to specific embodiments, it is obvious that modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the revendications. In particular, individual characteristics of the different illustrated / mentioned embodiments can be combined in embodiments. additional. Therefore, the description and the drawings should be taken in an illustrative rather than a restrictive sense.
[0086] Il est également évident que toutes les caractéristiques décrites en référence à un procédé sont transposables, seules ou en combinaison, à un dispositif, et inversement, toutes les caractéristiques décrites en référence à un dispositif sont transposables, seules ou en combinaison, à un procédé. It is also obvious that all the characteristics described with reference to a method can be transposed, alone or in combination, to a device, and conversely, all the characteristics described with reference to a device can be transposed, alone or in combination, to a method.

Claims

Revendications Claims
[Revendication 1] Système de freinage hydraulique pour un véhicule (V) comprenant une conduite de commande (200) et une conduite supplémentaire (100) adaptées pour être reliées à un système de freinage hydraulique d'un attelage, le système comprenant [Claim 1] A hydraulic brake system for a vehicle (V) comprising a control line (200) and an additional line (100) adapted to be connected to a hydraulic brake system of a hitch, the system comprising
- une commande de freinage (300) adaptée pour être actionnée par un utilisateur de manière à délivrer une pression de freinage (Pf), - a braking control (300) adapted to be actuated by a user so as to deliver a braking pressure (Pf),
- une valve de commande (220) configurée de manière à recevoir électroniquement une consigne d'initialisation constante , de manière à délivrer une pression de commande (Pc) selon une consigne d'initialisation à la conduite de commande (200), le système de freinage étant caractérisé en ce qu'il comprend en outre- a control valve (220) configured so as to electronically receive a constant initialization setpoint, so as to deliver a control pressure (Pc) according to an initialization setpoint to the control line (200), the control system braking being characterized in that it further comprises
- un capteur de pression de commande (420), configuré de manière à mesurer la pression de commande (Pc), - a control pressure sensor (420), configured so as to measure the control pressure (Pc),
- un capteur de commande (430), configuré de manière à détecter un actionnement de la commande de freinage (300) - a control sensor (430), configured so as to detect an actuation of the braking control (300)
- un calculateur (400), configuré de manière à lors de la détection d'un actionnement de la commande de freinage (300), déclencher une temporisation à l'issue de laquelle la pression de commande (Pc) mesurée est comparée avec une valeur seuil de pression de commande, si la pression de commande (Pc) mesurée est inférieure à la valeur seuil de pression de commande, le calculateur (400) pilote une valve supplémentaire (120) de manière à ce que la pression délivrée à la conduite supplémentaire (100) soit nulle, et pilote la valve de commande (220) de manière à ce que la pression dans la conduite de commande (200) soit nulle. - a computer (400), configured so as to trigger an actuation of the braking control (300), triggering a time delay at the end of which the measured control pressure (Pc) is compared with a value control pressure threshold, if the measured control pressure (Pc) is less than the control pressure threshold value, the computer (400) controls an additional valve (120) so that the pressure delivered to the additional pipe (100) is zero, and controls the control valve (220) so that the pressure in the control line (200) is zero.
[Revendication 2] Système selon la revendication 1, dans lequel le capteur de commande (430) est un potentiomètre, un capteur de position ou un capteur de pression associé à la commande de freinage (300). [Claim 2] A system according to claim 1, wherein the control sensor (430) is a potentiometer, a position sensor or a pressure sensor associated with the brake control (300).
[Revendication 3] Système selon l'une des revendications 1 ou 2, dans lequel le calculateur (400) est configuré de manière à définir la consigne d'initialisation constante et la valeur seuil de pression de commande en fonction de la température du fluide du système hydraulique, du régime de fonction d'un moteur primaire du véhicule (V), et de la cylindrée d'une pompe hydraulique du véhicule (V). [Claim 3] System according to one of claims 1 or 2, in which the computer (400) is configured so as to define the setpoint. constant initialization and the control pressure threshold value as a function of the temperature of the fluid of the hydraulic system, of the operating speed of a primary engine of the vehicle (V), and of the displacement of a hydraulic pump of the vehicle ( V).
[Revendication 4] Système selon l'une des revendications 1 à 3, dans lequel la consigne d'initialisation constante est comprise entre 10 bar et 40 bar, et la valeur seuil de pression de commande est comprise entre lObar et 15 bar. [Claim 4] System according to one of claims 1 to 3, in which the constant initialization setpoint is between 10 bar and 40 bar, and the control pressure threshold value is between 10 bar and 15 bar.
[Revendication 5] Système selon l'une des revendications 1 à 3, dans lequel la temporisation a une durée comprise entre 0,6 et 1 seconde. [Claim 5] System according to one of claims 1 to 3, in which the delay has a duration of between 0.6 and 1 second.
[Revendication 6] Procédé de pilotage d'un système de freinage hydraulique d'un véhicule (V) comprenant une conduite de commande (200) et une conduite supplémentaire (100) adaptées pour être reliées à un système de freinage hydraulique d'un attelage, dans lequel [Claim 6] A method of controlling a hydraulic braking system of a vehicle (V) comprising a control line (200) and an additional line (100) adapted to be connected to a hydraulic braking system of a coupling , in which
- (El) on actionne une commande de freinage (300) de manière à délivrer une pression de freinage (Pf), - (El) a braking control (300) is actuated so as to deliver a braking pressure (Pf),
- (E2) on détecte l'actionnement de la commande de freinage (300), - (E2) the actuation of the braking control (300) is detected,
- (E3) on déclenche une temporisation et (E4) fournit une consigne d'initialisation constante à une valve de commande (220), de manière à délivrer une pression de commande (Pc) selon une consigne d'initialisation à la conduite de commande (200), - (E3) a time delay is triggered and (E4) supplies a constant initialization instruction to a control valve (220), so as to deliver a control pressure (Pc) according to an initialization instruction to the control pipe (200),
- (E6) à l'issue de la temporisation, on compare une mesure de la pression de commande (Pc) à une valeur seuil de pression de commande, - (E6) at the end of the time delay, a control pressure measurement (Pc) is compared to a control pressure threshold value,
- (E7) si la pression de commande (Pc) mesurée est inférieure à ladite valeur seuil de pression de commande, on pilote une valve supplémentaire (120) de manière à ce que la pression délivrée à la conduite supplémentaire (100) soit nulle, et on pilote la valve de commande(220) de manière à ce que la pression dans la conduite de commande (200) soit nulle. - (E7) if the measured control pressure (Pc) is less than said control pressure threshold value, an additional valve (120) is piloted so that the pressure delivered to the additional pipe (100) is zero, and controlling the control valve (220) so that the pressure in the control line (200) is zero.
[Revendication 7] Procédé selon la revendication 6, dans lequel la temporisation a une durée comprise entre 0,6 seconde et 1 seconde. [Claim 7] A method according to claim 6, wherein the delay has a duration of between 0.6 seconds and 1 second.
[Revendication 8] Procédé selon l'une des revendications 6 ou 7, dans lequel la consigne d'initialisation constante est comprise entre 10 bar et 40 bar, et la valeur seuil de pression de commande est comprise entre 10 bar et 15 bar. [Claim 8] Method according to one of claims 6 or 7, in which the constant initialization setpoint is between 10 bar and 40 bar, and the control pressure threshold value is between 10 bar and 15 bar.
[Revendication 9] Procédé selon l'une des revendications 6 à 8, dans lequel on définit la consigne d'initialisation constante et la valeur seuil de pression de commande en fonction de la température du fluide du système hydraulique, du régime de fonction d'un moteur primaire du véhicule (V), et de la cylindrée d'une pompe hydraulique du véhicule (V). [Claim 9] Method according to one of claims 6 to 8, in which the constant initialization setpoint and the control pressure threshold value are defined as a function of the temperature of the fluid of the hydraulic system, of the operating speed of a primary motor of the vehicle (V), and the displacement of a hydraulic pump of the vehicle (V).
[Revendication 10] Procédé selon l'une des revendications 6 à 9, dans lequel si la pression de commande (Pc) mesurée est supérieure à ladite valeur seuil de pression de commande, on pilote la valve de commande (220) au moyen d'un calculateur (400) de manière à ce que la pression de commande (Pc) soit proportionnelle à la pression de freinage (Pf). [Claim 10] Method according to one of claims 6 to 9, wherein if the measured control pressure (Pc) is greater than said control pressure threshold value, the control valve (220) is controlled by means of a computer (400) so that the control pressure (Pc) is proportional to the braking pressure (Pf).
PCT/FR2020/051498 2019-09-03 2020-08-25 Hydraulic system and associated method for detecting a leak in the control line WO2021044091A1 (en)

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FR1909684A FR3100189B1 (en) 2019-09-03 2019-09-03 Hydraulic system and associated method for detecting a leak in the control line
FRFR1909684 2019-09-03

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3037023A1 (en) 2015-06-03 2016-12-09 Poclain Hydraulics Ind HYDRAULIC BRAKE SYSTEM OF A VEHICLE WITH SEVERAL AXLES, ESPECIALLY A MULTI-AXLE TRAILER
EP3190015A1 (en) * 2016-01-08 2017-07-12 Haldex Brake Products Aktiebolag Brake device for a tractor and group of such devices
EP3275745A1 (en) * 2016-07-28 2018-01-31 Deere & Company Dual line hydraulic trailer brake control circuit and method of control thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3037023A1 (en) 2015-06-03 2016-12-09 Poclain Hydraulics Ind HYDRAULIC BRAKE SYSTEM OF A VEHICLE WITH SEVERAL AXLES, ESPECIALLY A MULTI-AXLE TRAILER
EP3190015A1 (en) * 2016-01-08 2017-07-12 Haldex Brake Products Aktiebolag Brake device for a tractor and group of such devices
EP3275745A1 (en) * 2016-07-28 2018-01-31 Deere & Company Dual line hydraulic trailer brake control circuit and method of control thereof

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FR3100189A1 (en) 2021-03-05
FR3100189B1 (en) 2021-09-17

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