WO2021181016A1 - Method for controlling an electric vacuum pump in a vacuum braking system for a vehicle - Google Patents

Method for controlling an electric vacuum pump in a vacuum braking system for a vehicle Download PDF

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Publication number
WO2021181016A1
WO2021181016A1 PCT/FR2021/050196 FR2021050196W WO2021181016A1 WO 2021181016 A1 WO2021181016 A1 WO 2021181016A1 FR 2021050196 W FR2021050196 W FR 2021050196W WO 2021181016 A1 WO2021181016 A1 WO 2021181016A1
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WO
WIPO (PCT)
Prior art keywords
continuous
vacuum pump
periodic
activation
pressure threshold
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PCT/FR2021/050196
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French (fr)
Inventor
Claire MIQUEL
Herve DOUDOU
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Psa Automobiles Sa
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Application filed by Psa Automobiles Sa filed Critical Psa Automobiles Sa
Publication of WO2021181016A1 publication Critical patent/WO2021181016A1/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
    • B60T13/24—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 the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • 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
    • 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
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor

Definitions

  • TITLE PROCESS FOR CONTROL OF AN ELECTRIC VACUUM PUMP IN A VACUUM BRAKING SYSTEM FOR A
  • the present invention relates generally to a method for controlling an electric vacuum pump mounted on a motor vehicle.
  • the invention also relates to a vacuum braking system for a vehicle, this vacuum braking system for the vehicle comprising an electric vacuum pump, the control of the electric vacuum pump being implemented by a method.
  • the invention relates to a motor vehicle comprising such a vacuum braking system.
  • a motor vehicle is conventionally equipped with braking assistance, so as to reduce the force that the driver must exert with his foot on the brake pedal to obtain a braking effect, and if necessary a stop of the vehicle .
  • the most commonly adopted assistance is through a vacuum generated in a chamber, forming a brake amplifier.
  • the chamber is inserted into the braking system between the brake pedal and the master cylinder, the latter being connected to the hydraulic braking circuit.
  • this vacuum braking system with an electric vacuum pump has the particular drawback of constantly applying the vacuum pump when the driver presses the brake pedal strongly or presses it at a high frequency. Long activations of the electric vacuum pump can damage it in the long term. In addition, using the vehicle at altitude also means that the electric vacuum pump will have to operate for longer in order to provide a satisfactory vacuum reserve.
  • the vacuum pump constitutes the main vehicle vacuum generation system. It will indeed be more strained in terms of activation and duration of activation than on a hybrid motor vehicle, where it is still possible to switch to a vacuum pump coupled and driven mechanically by the engine.
  • the vacuum pump may overheat and / or its component parts may be damaged. A failure of the electric vacuum pump no longer ensures correct braking performance for the driver
  • An object of the present invention is to respond to the drawbacks of the prior art mentioned above and in particular, first of all, to provide protection for the electric vacuum pump in the event of heavy stress.
  • a first aspect of the invention relates to a method of controlling an electric vacuum pump in a vacuum braking system for a vehicle.
  • the method comprises the steps of:
  • the control of the electric vacuum pump switches from the continuous operating mode to the periodic operating mode, and vice versa from the periodic operating mode to the periodic operating mode.
  • Operating continuous at least as a function of the pressure measured in the vacuum braking system.
  • the invention consists in providing for a method of controlling a vacuum pump an additional operating mode, which will be periodic with thus a functional periodic activation.
  • Periodic activation makes it possible to activate the vacuum pump for a period of a few seconds, to deactivate it for another period of a few seconds, then to switch it on again and so on, all the time the vehicle is in a precise situation.
  • the vacuum requirement is thus detected by a pressure sensor.
  • the invention is to be able to switch to a more optimized driving mode for the vacuum pump, before reaching a situation where it will no longer be able to properly provide vacuum to the driver to be able to brake his vehicle.
  • Such control for the vacuum pump will make it possible to increase its availability on the vehicle, and to increase its durability, by avoiding excessively long activation times.
  • the heating of the vacuum pump will be limited.
  • control of the vacuum pump can switch from continuous operating mode to periodic operating mode, when the following conditions are simultaneously met:
  • a duration of continuous activation of the vacuum pump is greater than a first determined duration, or again when the measured pressure is greater than a lower continuous activation pressure threshold and the measured pressure is less than or equal to a threshold of higher continuous deactivation pressure, and
  • a vehicle speed is less than a threshold speed
  • an altitude of the vehicle is between a minimum altitude and a maximum altitude.
  • the continuous operating mode of the electric vacuum pump stops and the periodic operating mode can begin, if the mentioned preconditions allow it.
  • the pressure sensor controls the starting of the electric vacuum pump according to two thresholds, a lower continuous activation threshold and an upper continuous deactivation threshold. As soon as a target vacuum level is reached and / or as soon as the shutdown conditions are met, the electric vacuum pump stop.
  • the activation of the functional periodic mode will only be carried out after a long continuous activation, in order to avoid any overheating or damage to the electric vacuum pump and in order to continue to guarantee the vacuum supply service in the braking system. depression.
  • the activation of the periodic mode is also conditioned on a vehicle speed threshold (low), to favor its activation on more typical “city” routes and at altitudes for example below 3000m, in order to more precisely target real-life situations.
  • a vehicle speed threshold low
  • the continuous mode of operation can be reactivated at any time if necessary. Operation of the vehicle below a threshold speed implies that the electric vacuum pump will operate for longer, in order to provide a satisfactory vacuum reserve, the continuous operating mode thus remaining activated. Operation at altitude also means that the electric vacuum pump will operate for longer, in order to provide a satisfactory vacuum reserve, the continuous operating mode thus remaining activated.
  • the upper continuous deactivation pressure threshold may be greater than the lower continuous activation pressure threshold.
  • control of the vacuum pump can switch from periodic operating mode to continuous operating mode, when only one of the following conditions is met:
  • the measured pressure is greater than or equal to a higher pressure threshold for periodic deactivation
  • the measured pressure is less than a lower pressure threshold for periodic activation, - the measured pressure is greater than an upper pressure threshold for continuous deactivation and below the upper pressure threshold for periodic deactivation for a second determined period,
  • the pressure measured is less than a lower pressure threshold for continuous activation and greater than a lower pressure threshold for periodic activation for a third determined period.
  • two additional thresholds are defined, and when the pressure exceeds the upper additional threshold, or when the pressure is below the lower additional threshold, the periodic operation mode may stop and the continuous operation mode may restart.
  • any control mode of the electric vacuum pump is stopped, the target vacuum level in the vacuum braking system being reached.
  • the control of the vacuum pump then switches back to continuous operating mode.
  • the periodic mode is maintained for this second period. The periodic mode stops at the end of this second duration, and the stopping of the activation of the electric vacuum pump is then authorized beyond this second duration, because the measured pressure is above the threshold of continuous deactivation.
  • the periodic mode stops at the end of this third period and the mode continuous operation of the vacuum pump is then reactivated beyond this time delay, because the measured pressure is below the continuous activation threshold.
  • the upper pressure threshold for periodic deactivation may be greater than the upper pressure threshold for continuous deactivation.
  • the upper continuous deactivation pressure threshold may be greater than the lower continuous activation pressure threshold.
  • the lower pressure threshold for continuous activation may be greater than the lower pressure threshold for periodic activation.
  • the periodic operating mode can stop once this second determined period has expired and the stopping the control of the electric vacuum pump in continuous mode or in periodic mode can be authorized.
  • the periodic operating mode can stop once this third determined duration has expired and the continuous operating mode can then start again.
  • control of the vacuum pump can remain in the periodic operating mode beyond a fourth determined period, when the measured pressure is greater than a lower pressure threshold for continuous activation and less than or equal at a higher continuous deactivation pressure threshold.
  • the control of the vacuum pump can remain in the periodic operating mode beyond a fourth determined duration on the condition of having previously had a long continuous activation of the electric vacuum pump of more than 30s .
  • the method can comprise an additional step, in the event of overheating or damage to the vacuum pump, following a long continuous activation, consisting in triggering at least one of the following degraded modes, with:
  • the after-sales service will be notified in the event of failure of the vacuum pump.
  • the vacuum pump will go into an emergency operating mode which will still allow at least one braking of the vehicle.
  • By the “stop” light on the driver will be warned of the breakdown and will stop his vehicle. Compensation strategies for the lack of braking assistance will be initiated by activating a hydraulic pump with an electronic trajectory corrector, such as ESC or ESP.
  • a second aspect of the invention is a vacuum braking system for a vehicle, comprising an electric vacuum pump, the control of the vacuum pump being implemented according to the method according to the first aspect of the invention .
  • a final aspect of the invention is a motor vehicle comprising a braking system according to the second aspect of the invention.
  • FIG. 1 represents an architecture of the implementation of the control method according to the present invention
  • FIG. 2 represents the positioning of the different pressure thresholds, namely periodic deactivation, continuous deactivation, continuous activation, and periodic activation, with respect to each other;
  • FIG. 3 represents a strategy for controlling the electric vacuum pump with activation and deactivation of the periodic operating mode and with activation and deactivation of the continuous operating mode;
  • FIG. 4a represents, in broken lines, a pressure evolution curve DP measured according to a first test case, measured in millibars, and in mixed lines-dots, a pressure evolution curve DP measured according to a second test case, measured in millibars, in the vacuum braking system, as a function of time t expressed in seconds;
  • FIG. 4b represents three curves of changes in time counts, measured in seconds, a first curve of the continuous operating mode, in continuous line, and of the periodic operating mode, a first curve in broken lines according to the first test case, and a second curve in mixed line-dots according to the second test case, according to the pressure evolution curve of FIG. 4a, as a function of time t expressed in seconds;
  • FIG. 4c represents two curves for activating and deactivating the continuous operating mode, a first curve in solid line according to the first case test, and a second curve in mixed line-dots according to the second test case, according to the pressure evolution curve of FIG. 4a, as a function of time t expressed in seconds;
  • FIG. 4d represents an activation and deactivation curve of the periodic operating mode, a first continuous line curve according to the first test case, and a second dash-dot mixed curve according to the second test case, according to the evolution curve pressure in Figure 4a, as a function of time t expressed in seconds.
  • FIG. 1 presenting an architecture 1 of the implementation of the method according to the present invention.
  • An electric vacuum pump 2 in a vacuum braking system of a motor vehicle is controlled by an engine computer 3 (eVCU) of the vehicle.
  • the functions linked to the control method 4 of the vacuum pump 2 are embedded in the software present in the computer 3.
  • the eVCU computer 3 is electrically connected to a pressure sensor 6, to a vehicle speed sensor 7, to an atmospheric pressure sensor 8, making it possible to determine the altitude of the vehicle, and to a sensor detecting the pressure of the driver on the brake 9.
  • the pressure sensor 6 measures the pressure DP within the depression braking system.
  • the vacuum pump 2 is connected to a computer of a trajectory corrector 11, known under the name "Electronic Stability Control” (ESC) or “Electronic Stability Program” (ESP).
  • ESC Electronic Stability Control
  • ESP Electronic Stability Program
  • a hydraulic pump linked to the path corrector computer 11 is activated.
  • This compensation strategy 12 for lack of braking assistance 13 known under the names “Hydraulic Brake Boost” and “Hydraulic Brake Failure Compensation” (HBB / HBC), is embedded in the computer of the trajectory corrector 11.
  • a degraded operating mode In the event of failure of the vacuum pump 2, a degraded operating mode, with various transmissions of degraded modes 14, is thus implemented by the computer 3.
  • a fault report signaling a failure of vacuum supply for 16 after-sales service is provided, for example via an interface of GSM type, this coming within the framework of remote monitoring of the vehicle.
  • a sending of a degraded mode requesting the activation of a dysfunctional periodic control mode 17 is provided, this giving the possibility of still having at least one braking allowing the driver to stop the vehicle.
  • a STOP (or Service) warning light is provided, informing the driver of a fault in his vehicle, this immediately alerting the driver and obliging him to stop the vehicle.
  • the vacuum requirement controls the starting of the electric vacuum pump 2, as a function of a lower pressure threshold of continuous activation DPon and of a pressure threshold upper continuous deactivation DPoff (see Fig. 2).
  • the upper continuous deactivation pressure threshold DPoff is greater than the lower continuous deactivation pressure threshold DPon.
  • the method 19 for controlling the electric vacuum pump 2 requires the introduction of two new activation and deactivation thresholds, namely a lower pressure threshold for periodic activation DPon 'and a DPoff periodic deactivation upper pressure threshold.
  • the activation and deactivation thresholds are positioned in the following order and must not overlap: periodic deactivation pressure threshold DPoff, continuous deactivation threshold DPoff, continuous activation threshold DPon, and pressure threshold periodic activation DPon '.
  • the upper pressure threshold for periodic deactivation DPoff is greater than the upper pressure threshold for continuous deactivation DPoff.
  • the upper continuous deactivation pressure threshold DPoff is greater than the lower continuous deactivation pressure threshold DPon.
  • the DPon continuous activation lower pressure threshold is greater than the DPon periodic activation lower pressure threshold.
  • the method 19 for controlling the electric vacuum pump 2 comprises two operating modes, namely a continuous operating mode and a periodic operating mode.
  • the cumulative conditions "AND" 22 are as follows.
  • the duration of continuous activation of the vacuum pump 2 must be greater than a first determined duration t1. For example t1> 30s. But also as an alternative criterion, the measured pressure DP must be greater than a lower pressure threshold for continuous activation DPon and less than or equal to an upper pressure threshold for continuous deactivation DPoff.
  • a vehicle speed V is less than a threshold speed V s.
  • the threshold speed of the vehicle V s must be low, for example V ⁇ 30 km / h.
  • an altitude of the vehicle is between a minimum altitude Hmin and a maximum altitude Hmax.
  • the altitude must for example be between 0 (Hmin) and 3000 m (Hmax).
  • the measured pressure DP can exceed or be equal to the upper threshold of periodic deactivation DPoff: DP> DPoff.
  • the periodic mode and the continuous mode are stopped, the target depression threshold being reached.
  • the measured pressure DP can exceed the lower threshold of periodic deactivation DPon ": DP ⁇ DPon". In this case, the control of the vacuum pump 2 then switches back to continuous activation.
  • the measured pressure DP can remain above the upper pressure threshold of continuous deactivation DPoff, but can remain below the upper threshold of periodic deactivation DPoff, during a time delay t2.
  • t2 30s.
  • the periodic mode stops and the vacuum pump 2 will automatically stop because the pressure DP is above the upper pressure threshold of continuous deactivation DPoff.
  • the measured pressure DP can remain below the lower continuous activation threshold DPon, but not below the lower periodic deactivation threshold DPon ′, for a time delay t3.
  • t3 30s.
  • the periodic mode stops, the continuous mode is reactivated and the vacuum pump 2 will automatically restart in continuous mode because the pressure DP is below the lower pressure threshold for continuous activation DPon.
  • FIGS. 4a-4d Different curves of the measured pressure DP as well as the consequences on the control of the vacuum pump 2 are shown in FIGS. 4a-4d. These curves correspond to situations which concern the conditions for activating and deactivating the periodic mode.
  • the activation of the functional periodic activation can only be done after having had a long continuous activation beforehand (of 30s or less), for all the following cases below.
  • the vacuum pump 2 is activated in continuous for 15s.
  • the measured pressure DP rises 36 and exceeds the lower continuous activation pressure threshold DPon, but remains below the upper continuous deactivation pressure threshold DPoff.
  • the periodic mode is continuous and is maintained beyond 20s. This corresponds to a lasting periodic activation.
  • the 20s time delay of the periodic mode is triggered 37, beyond the 15s continuously, but as the pressure DP remains blocked between the lower continuous activation pressure thresholds DPon and upper continuous deactivation DPoff, the activation periodic continues beyond the timeout.
  • the measured pressure DP crosses 38 the lower threshold of periodic deactivation DPon '. Periodic activation then ceases and control of the pump empty 2 switches back to continuous activation. In this case the continuous activation lasts 40s non-stop, beyond the time delay because the measured pressure DP remains blocked below the lower threshold of periodic deactivation DPon '.
  • the control of the vacuum pump 2 then exits the periodic mode 42, before the 20s provided because the measured pressure DP will quickly be greater than the upper threshold periodic deactivation DPoff.
  • Periodic activation 42 is restarted briefly, when the lower continuous activation pressure threshold DPon is crossed, because the measured pressure DP is found in the area between the upper continuous deactivation pressure threshold DPoff and the upper threshold of periodic deactivation DPoff. Periodic activation 42 is interrupted when the upper threshold of periodic deactivation DPoff is exceeded.
  • the continuous activation 44 starts as soon as the lower pressure threshold of continuous activation DPon is crossed, after 20s.
  • the piloting stops the activation of the electric vacuum pump 2.
  • the measured pressure DP crosses the upper pressure threshold of continuous deactivation DPoff. Periodic activation is triggered for 20s only, because the pressure is above the upper pressure threshold for continuous deactivation DPoff. And since the measured pressure DP does not cross the upper threshold of periodic deactivation DPoff, the vacuum pump 2 then switches off after 20s.
  • the continuous activation 47 starts as soon as the lower pressure threshold of continuous activation DPon is crossed, after 20s.
  • the electric vacuum pump 2 is activated in the continuous operating mode.
  • the continuous activation starts as soon as the lower pressure threshold of continuous activation DPon is crossed and lasts 30s.
  • the control of the vacuum pump 2 switches to periodic mode.
  • the measured pressure DP remains stuck between the lower continuous activation pressure threshold DPon and the lower periodic deactivation threshold DPon '.
  • the periodic activation 49 engages over the 20s, but as the measured pressure DP remains blocked between the lower continuous activation pressure threshold DPon and the lower threshold of periodic deactivation DPon ', the control switches back to continuous activation.
  • the control of the vacuum pump 2 exits periodic mode .
  • the control switches back to a long activation of the vacuum pump 2.
  • the periodic activation is triggered briefly, when the lower continuous activation pressure threshold DPon is crossed.
  • the measured pressure DP is found in the zone between the lower continuous activation pressure threshold DPon and the lower periodic deactivation threshold DPon '.
  • the control switches back to continuous activation as soon as the lower periodic deactivation threshold DPon 'is crosses. In this situation 51, periodic activation takes priority over continuous activation, over 10s.
  • the present invention presents a relative pressure sensor
  • the sensor can also be an absolute pressure sensor.
  • the activation-deactivation thresholds are therefore reversed compared to what has been previously described.!

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

A method for controlling an electric vacuum pump (2) in a vacuum braking system for a vehicle, comprising the steps of: - measuring a pressure in the braking system, and - controlling the pump (2) according to a continuous or periodic operating mode, the control of the vacuum pump (2) transitioning from continuous to periodic operating mode, and vice versa, at least depending on the pressure measured in the braking system.

Description

DESCRIPTION DESCRIPTION
TITRE : PROCÉDÉ DE PILOTAGE D’UNE POMPE À VIDE ÉLECTRIQUE DANS UN SYSTÈME DE FREINAGE À DÉPRESSION POUR UNTITLE: PROCESS FOR CONTROL OF AN ELECTRIC VACUUM PUMP IN A VACUUM BRAKING SYSTEM FOR A
VÉHICULE DOMAINE TECHNIQUE VEHICLE TECHNICAL FIELD
[0001] La présente invention revendique la priorité de la demande française N°2002335 déposée le 10.03.2020 dont le contenu (te<te, dessins et revendications) est ici incorporé par référence. The present invention claims the priority of French application No. 2002335 filed on 03.10.2020, the content of which (te <te, drawings and claims) is incorporated here by reference.
[0002] La présente invention concerne de manière générale un procédé de pilotage d’une pompe à vide électrique montée sur un véhicule automobile. L’invention se rapporte également à un système de freinage à dépression pour un véhicule, ce système de freinage à dépression pour le véhicule comprenant une pompe à vide électrique, le pilotage de la pompe à vide électrique étant mise en oeuvre grâce à un procédé. L’invention concerne enfin un véhicule automobile comprenant un tel système de freinage à dépression. [0002] The present invention relates generally to a method for controlling an electric vacuum pump mounted on a motor vehicle. The invention also relates to a vacuum braking system for a vehicle, this vacuum braking system for the vehicle comprising an electric vacuum pump, the control of the electric vacuum pump being implemented by a method. Finally, the invention relates to a motor vehicle comprising such a vacuum braking system.
[0003] Un véhicule automobile est classiquement équipé d’une assistance au freinage, de façon à réduire la force que le conducteur doit exercer avec son pied sur la pédale de frein pour obtenir un effet de freinage, et le cas échéant un arrêt du véhicule. L’assistance la plus communément adoptée est réalisée par le biais d’une dépression générée dans une chambre, formant un amplificateur de frein. La chambre est insérée dans le système de freinage entre la pédale de frein et le maître cylindre, ce dernier étant branché sur le circuit hydraulique de freinage. [0003] A motor vehicle is conventionally equipped with braking assistance, so as to reduce the force that the driver must exert with his foot on the brake pedal to obtain a braking effect, and if necessary a stop of the vehicle . The most commonly adopted assistance is through a vacuum generated in a chamber, forming a brake amplifier. The chamber is inserted into the braking system between the brake pedal and the master cylinder, the latter being connected to the hydraulic braking circuit.
ART ANTÉRIEUR PRIOR ART
[0004] Dans ce type de système de freinage à dépression, il est connu dans l’art antérieur, par exemple du document EP2726351 , que le vide necessaire est typiquement généré par une pompe à vide. La pompe à vide est soit entraînée mécaniquement par le moteur du véhicule, soit par un moteur électrique dédié. La nécessité de maintenir une pression négative est détectée par un capteur de pression. Le capteur commande la mise en marche de la pompe à vide électrique en fonction de seuils d’activation et de désactivation. Dès qu’un niveau de dépression cible est atteint dans et/ou que les conditions d’arrêt sont remplies, la pompe à vide électrique s’arrête. In this type of vacuum braking system, it is known in the prior art, for example from document EP2726351, that the necessary vacuum is typically generated by a vacuum pump. The vacuum pump is either driven mechanically by the vehicle engine or by a dedicated electric motor. The need to maintain negative pressure is detected by a pressure sensor. The sensor controls the starting of the electric vacuum pump according to activation and deactivation thresholds. As soon as a level of depression target is reached in and / or the stop conditions are met, the electric vacuum pump stops.
[0005] En contrepartie, ce système de freinage à dépression avec une pompe à vide électrique présente notamment l’inconvénient de solliciter constamment la pompe à vide, lorsque le conducteur appuie fortement sur la pédale de frein ou encore appuie à une fréquence élevée. De longues activations de la pompe à vide électrique peuvent générer un endommagement de celle-ci sur du long terme. De plus, l’utilisation du véhicule en altitude implique également que la pompe à vide électrique devra fonctionner, de surcroît, plus longtemps afin de fournir une réserve de vide satisfaisante. [0005] On the other hand, this vacuum braking system with an electric vacuum pump has the particular drawback of constantly applying the vacuum pump when the driver presses the brake pedal strongly or presses it at a high frequency. Long activations of the electric vacuum pump can damage it in the long term. In addition, using the vehicle at altitude also means that the electric vacuum pump will have to operate for longer in order to provide a satisfactory vacuum reserve.
[0006] Dans le cas d’un véhicule électrique, la pompe à vide constitue le principal système de génération du vide du véhicule. Elle sera effectivement plus sollicitée en termes d’activation et de durée d’activation que sur un véhicule à moteur hybride, où il reste possible de basculer sur une pompe à vide attelée et entraînée mécaniquement par le moteur. [0006] In the case of an electric vehicle, the vacuum pump constitutes the main vehicle vacuum generation system. It will indeed be more strained in terms of activation and duration of activation than on a hybrid motor vehicle, where it is still possible to switch to a vacuum pump coupled and driven mechanically by the engine.
[0007] En cas d’utilisation prolongée, la pompe à vide peut ainsi surchauffer et/ou ses pièces constitutives peuvent être endommagées. Une défaillance de la pompe à vide électrique ne permet plus d’assurer une prestation de freinage correcte pour le conducteur [0007] In the event of prolonged use, the vacuum pump may overheat and / or its component parts may be damaged. A failure of the electric vacuum pump no longer ensures correct braking performance for the driver
RESUME DE L'INVENTION SUMMARY OF THE INVENTION
[0008] Un but de la présente invention est de répondre aux inconvénients de l’art antérieur mentionnés ci-dessus et en particulier, tout d’abord, d’assurer une protection de la pompe à vide électrique en cas de fortes solicitations. [0008] An object of the present invention is to respond to the drawbacks of the prior art mentioned above and in particular, first of all, to provide protection for the electric vacuum pump in the event of heavy stress.
[0009] Pour cela, un premier aspect de l’invention concerne un procédé de pilotage d’une pompe à vide électrique dans un système de freinage à dépression pour un véhicule. [0009] For this, a first aspect of the invention relates to a method of controlling an electric vacuum pump in a vacuum braking system for a vehicle.
[0010] Le procédé comprend les étapes consistant : The method comprises the steps of:
- à mesurer une pression dans le système de freinage, et - to measure a pressure in the braking system, and
- à piloter la pompe à vide électrique selon un mode de fonctionnement continu ou un mode de fonctionnement périodique, le pilotage de la pompe à vide électrique passe du mode de fonctionnement continu au mode de fonctionnement périodique, et inversement du mode de fonctionnement périodique au mode de fonctionnement continu, au moins en fonction de la pression mesurée dans le système de freinage à dépression. - to control the electric vacuum pump according to a continuous operating mode or a periodic operating mode, the control of the electric vacuum pump switches from the continuous operating mode to the periodic operating mode, and vice versa from the periodic operating mode to the periodic operating mode. Operating continuous, at least as a function of the pressure measured in the vacuum braking system.
[0011] Autrement dit, l’invention consiste à prévoir pour un procédé de pilotage d’une pompe à vide un mode de fonctionnement supplémentaire, qui va être périodique avec ainsi une activation périodique fonctionnelle. L’activation périodique permet d’activer la pompe à vide pendant une durée de quelques secondes, de la désactiver pendant une autre durée de quelques secondes, puis de la réenclencher et ainsi de suite, tout le temps où le véhicule va se trouver dans une situation précise. In other words, the invention consists in providing for a method of controlling a vacuum pump an additional operating mode, which will be periodic with thus a functional periodic activation. Periodic activation makes it possible to activate the vacuum pump for a period of a few seconds, to deactivate it for another period of a few seconds, then to switch it on again and so on, all the time the vehicle is in a precise situation.
[0012] Le besoin en vide est ainsi détecté par un capteur de pression. L’invention consiste à pouvoir basculer dans un mode de pilotage plus optimisé pour la pompe à vide, avant d’arriver dans une situation où elle ne sera plus en mesure de fournir correctement du vide au conducteur pour pouvoir freiner son véhicule. Un tel pilotage pour la pompe à vide va permettre d’accroître sa disponibilité sur le véhicule, et d’augmenter sa durabilité, en lui évitant des durées d’activations trop longues. L’échauffement de la pompe à vide va être limité. The vacuum requirement is thus detected by a pressure sensor. The invention is to be able to switch to a more optimized driving mode for the vacuum pump, before reaching a situation where it will no longer be able to properly provide vacuum to the driver to be able to brake his vehicle. Such control for the vacuum pump will make it possible to increase its availability on the vehicle, and to increase its durability, by avoiding excessively long activation times. The heating of the vacuum pump will be limited.
[0013] Avantageusement, le pilotage de la pompe à vide peut passer du mode de fonctionnement continu au mode de fonctionnement périodique, lorsque les conditions suivantes sont simultanément remplies : Advantageously, the control of the vacuum pump can switch from continuous operating mode to periodic operating mode, when the following conditions are simultaneously met:
- une durée d’activation continue de la pompe à vide est supérieure à une première durée déterminée, ou encore lorsque la pression mesurée est supérieure à un seuil de pression inférieur d’activation continu et la pression mesurée est inférieure ou égale à un seuil de pression supérieur de désactivation continu, et - a duration of continuous activation of the vacuum pump is greater than a first determined duration, or again when the measured pressure is greater than a lower continuous activation pressure threshold and the measured pressure is less than or equal to a threshold of higher continuous deactivation pressure, and
- une vitesse du véhicule est inférieure à une vitesse seuil, et - a vehicle speed is less than a threshold speed, and
- une altitude du véhicule est comprise entre une altitude minimale et une altitude maximale. - an altitude of the vehicle is between a minimum altitude and a maximum altitude.
[0014] Dès que la pompe à vide tourne trop longtemps, le mode de fonctionnement continu de la pompe à vide électrique s’arrête et le mode de fonctionnement périodique peut commencer, si les conditions préalables mentionnées le permettent. Le capteur de pression commande la mise en marche de la pompe à vide électrique en fonction de deux seuils, un seuil d’activation continu inférieur et un seuil de désactivation continu supérieur. Dès qu’un niveau de dépression cible est atteint et/ou dès que les conditions d’arrêt sont remplies, la pompe à vide électrique s’arrête. L’activation du mode périodique fonctionnel ne se réalisera que suite à une activation continue longue, afin d’éviter toute surchauffe ou endommagement de la pompe à vide électrique et afin de continuer à garantir la prestation de fourniture de vide dans le système de freinage à dépression. L’activation du mode périodique est conditionnée également à un seuil de vitesse véhicule (faible), pour privilégier son activation sur des parcours plus typés « ville » et à des altitudes par exemple inférieures à 3000m, afin de cibler plus précisément des situations de vie où la pompe à vide électrique peut être plus fortement sollicitée, le mode de fonctionnement continu pouvant être réactivé à tout moment en cas de besoin. Le fonctionnement du véhicule en-dessous d’une vitesse seuil implique que la pompe à vide électrique va fonctionner plus longtemps, afin de fournir une réserve de vide satisfaisante, le mode de fonctionnement continu restant ainsi activé. Le fonctionnement en altitude implique également que la pompe à vide électrique va fonctionner plus longtemps, afin de fournir une réserve de vide satisfaisante, le mode de fonctionnement continu restant ainsi activé. As soon as the vacuum pump runs for too long, the continuous operating mode of the electric vacuum pump stops and the periodic operating mode can begin, if the mentioned preconditions allow it. The pressure sensor controls the starting of the electric vacuum pump according to two thresholds, a lower continuous activation threshold and an upper continuous deactivation threshold. As soon as a target vacuum level is reached and / or as soon as the shutdown conditions are met, the electric vacuum pump stop. The activation of the functional periodic mode will only be carried out after a long continuous activation, in order to avoid any overheating or damage to the electric vacuum pump and in order to continue to guarantee the vacuum supply service in the braking system. depression. The activation of the periodic mode is also conditioned on a vehicle speed threshold (low), to favor its activation on more typical “city” routes and at altitudes for example below 3000m, in order to more precisely target real-life situations. where the electric vacuum pump can be more heavily used, the continuous mode of operation can be reactivated at any time if necessary. Operation of the vehicle below a threshold speed implies that the electric vacuum pump will operate for longer, in order to provide a satisfactory vacuum reserve, the continuous operating mode thus remaining activated. Operation at altitude also means that the electric vacuum pump will operate for longer, in order to provide a satisfactory vacuum reserve, the continuous operating mode thus remaining activated.
[0015] Avantageusement, le seuil de pression supérieur de désactivation continu peut être supérieur au seuil de pression inférieur d’activation continu. Advantageously, the upper continuous deactivation pressure threshold may be greater than the lower continuous activation pressure threshold.
[0016] Avantageusement, le pilotage de la pompe à vide peut passer du mode de fonctionnement périodique au mode de fonctionnement continu, lorsqu’une seule des conditions suivantes est remplie : Advantageously, the control of the vacuum pump can switch from periodic operating mode to continuous operating mode, when only one of the following conditions is met:
- la pression mesurée est supérieure ou égale à un seuil de pression supérieur de désactivation périodique, - the measured pressure is greater than or equal to a higher pressure threshold for periodic deactivation,
- la pression mesurée est inférieure à un seuil de pression inférieur d’activation périodique, - la pression mesurée est supérieure à un seuil de pression supérieur de désactivation continu et inférieure au seuil de pression supérieur de désactivation périodique pendant une deuxième durée déterminée, - the measured pressure is less than a lower pressure threshold for periodic activation, - the measured pressure is greater than an upper pressure threshold for continuous deactivation and below the upper pressure threshold for periodic deactivation for a second determined period,
- la pression mesurée est inférieure à un seuil de pression inférieur d’activation continu et supérieure à un seuil de pression inférieur d’activation périodique pendant une troisième durée déterminée. - the pressure measured is less than a lower pressure threshold for continuous activation and greater than a lower pressure threshold for periodic activation for a third determined period.
[0017] Autrement dit, deux seuils supplémentaires sont définis, et lorsque la pression dépasse le seuil supplémentaire supérieur, ou lorsque la pression est inférieure au seuil supplémentaire inférieur, le mode de fonctionnement périodique peut s’arrêter et le mode de fonctionnement continu peut recommencer. In other words, two additional thresholds are defined, and when the pressure exceeds the upper additional threshold, or when the pressure is below the lower additional threshold, the periodic operation mode may stop and the continuous operation mode may restart.
[0018] Dès que la pression mesurée est supérieure ou égale à un seuil de pression supérieur de désactivation périodique, tout mode de pilotage de la pompe à vide électrique est arrêté, le niveau de dépression cible dans le système de freinage à dépression étant atteint. Dès que la pression mesurée est inférieure à un seuil de pression inférieur d’activation périodique, le pilotage de la pompe à vide rebascule alors en mode de fonctionnement continu. Dès que la pression mesurée est supérieure à un seuil de pression supérieur de désactivation continu et inférieure au seuil de pression supérieur de désactivation périodique pendant une deuxième durée déterminée, le mode périodique se maintient pendant cette deuxième durée. Le mode périodique s’arrête au bout de cette deuxième durée, et l’arrêt de l’activation de la pompe à vide électrique est alors autorisé au-delà de cette deuxième durée, car la pression mesurée se trouve au-dessus du seuil de désactivation continu. Dès que la pression mesurée est inférieure à un seuil de pression inférieur d’activation continu et supérieure à un seuil de pression inférieur d’activation périodique pendant une troisième durée déterminée, le mode périodique s’arrête au bout de cette troisième durée et le mode de fonctionnement continu de la pompe à vide est alors réactivé au-delà de cette temporisation, car la pression mesurée est en-dessous du seuil d’activation continu. As soon as the measured pressure is greater than or equal to a higher pressure threshold for periodic deactivation, any control mode of the electric vacuum pump is stopped, the target vacuum level in the vacuum braking system being reached. As soon as the measured pressure is below a lower pressure threshold for periodic activation, the control of the vacuum pump then switches back to continuous operating mode. As soon as the measured pressure is greater than an upper pressure threshold for continuous deactivation and lower than the upper pressure threshold for periodic deactivation for a second determined period, the periodic mode is maintained for this second period. The periodic mode stops at the end of this second duration, and the stopping of the activation of the electric vacuum pump is then authorized beyond this second duration, because the measured pressure is above the threshold of continuous deactivation. As soon as the measured pressure is less than a lower continuous activation pressure threshold and greater than a lower periodic activation pressure threshold for a third determined period, the periodic mode stops at the end of this third period and the mode continuous operation of the vacuum pump is then reactivated beyond this time delay, because the measured pressure is below the continuous activation threshold.
[0019] Avantageusement, le seuil de pression supérieur de désactivation périodique peut être supérieur au seuil de pression supérieur de désactivation continu. Avantageusement, le seuil de pression supérieur de désactivation continu peut être supérieur au seuil de pression inférieur d’activation continu. Et avantageusement, le seuil de pression inférieur d’activation continu peut être supérieur au seuil de pression inférieur d’activation périodique. Advantageously, the upper pressure threshold for periodic deactivation may be greater than the upper pressure threshold for continuous deactivation. Advantageously, the upper continuous deactivation pressure threshold may be greater than the lower continuous activation pressure threshold. And advantageously, the lower pressure threshold for continuous activation may be greater than the lower pressure threshold for periodic activation.
[0020] Lorsque la pression oscille entre le seuil de pression supérieur de désactivation périodique et le seuil de pression supérieur de désactivation continu, pendant une deuxième durée déterminée, le mode de fonctionnement périodique peut s’arrêter une fois cette deuxième durée déterminée échue et l’arrêt du pilotage de la pompe à vide électrique en mode continu ou en mode périodique peut être autorisé. Lorsque la pression oscille entre le seuil de pression inférieur d’activation continu et le seuil de pression inférieur d’activation périodique, pendant une troisième durée déterminée, le mode de fonctionnement périodique peut s’arrêter une fois cette troisièmedurée déterminée échue et le mode de fonctionnement continu peut alors recommencer. When the pressure oscillates between the upper pressure threshold of periodic deactivation and the upper pressure threshold of continuous deactivation, for a second determined period, the periodic operating mode can stop once this second determined period has expired and the stopping the control of the electric vacuum pump in continuous mode or in periodic mode can be authorized. When the pressure oscillates between the lower continuous activation pressure threshold and the lower periodic activation pressure threshold, for a period of third determined duration, the periodic operating mode can stop once this third determined duration has expired and the continuous operating mode can then start again.
[0021] Avantageusement, le pilotage de la pompe à vide peut rester dans le mode de fonctionnement périodique au-delà d’une quatrième durée déterminée, lorsque la pression mesurée est supérieure à un seuil de pression inférieur d’activation continu et inférieure ou égale à un seuil de pression supérieur de désactivation continu. Advantageously, the control of the vacuum pump can remain in the periodic operating mode beyond a fourth determined period, when the measured pressure is greater than a lower pressure threshold for continuous activation and less than or equal at a higher continuous deactivation pressure threshold.
[0022] Le pilotage de la pompe à vide peut rester dans le mode de fonctionnement périodique au-delà d’une quatrième durée déterminée à la condition d’avoir eu au préalable une activation longue continue de la pompe à vide électrique de plus de 30s. The control of the vacuum pump can remain in the periodic operating mode beyond a fourth determined duration on the condition of having previously had a long continuous activation of the electric vacuum pump of more than 30s .
[0023] Avantageusement, le procédé peut comprendre une étape supplémentaire, en cas d’une surchauffe ou d’un endommagement de la pompe à vide, suite à une activation longue continue, consistant à enclencher au moins un des modes dégradés suivants, avec : Advantageously, the method can comprise an additional step, in the event of overheating or damage to the vacuum pump, following a long continuous activation, consisting in triggering at least one of the following degraded modes, with:
- un envoi d’un signal au service après-vente, signalant une défaillance de la pompe à vide, - sending a signal to the after-sales service, indicating a failure of the vacuum pump,
- une activation d’un mode de pilotage périodique dysfonctionnel de la pompe à vide,- activation of a dysfunctional periodic control mode of the vacuum pump,
- un allumage d’un voyant au tableau de bord, correspondant à une défaillance du véhicule, - an indicator light on the dashboard, corresponding to a vehicle failure,
- une activation d’une pompe hydraulique d’une commande de stabilité électronique. - activation of a hydraulic pump with electronic stability control.
[0024] Le service après-vente va être averti en cas de défaillance de la pompe à vide. La pompe à vide va passer dans un mode de fonctionnement de secours qui va permettre encore au moins un freinage du véhicule. Par le voyant « stop » allumé, le conducteur va être averti de la panne et va arrêter son véhicule. Des stratégies de compensations de manque d’assistance au freinage vont être enclenchées par activation d’une pompe hydraulique d’un correcteur électronique de trajectoire, de type ESC ou ESP. The after-sales service will be notified in the event of failure of the vacuum pump. The vacuum pump will go into an emergency operating mode which will still allow at least one braking of the vehicle. By the “stop” light on, the driver will be warned of the breakdown and will stop his vehicle. Compensation strategies for the lack of braking assistance will be initiated by activating a hydraulic pump with an electronic trajectory corrector, such as ESC or ESP.
[0025] Avantageusement, le pilotage de la pompe à vide peut être mis en oeuvre à l’aide d’un calculateur moteur du véhicule. [0026] Un deuxième aspect de l’invention est un système de freinage à dépression pour un véhicule, comprenant une pompe à vide électrique, le pilotage de la pompe à vide étant mise en oeuvre selon le procédé selon le premier aspect de l’invention. Advantageously, the control of the vacuum pump can be implemented using an engine computer of the vehicle. A second aspect of the invention is a vacuum braking system for a vehicle, comprising an electric vacuum pump, the control of the vacuum pump being implemented according to the method according to the first aspect of the invention .
[0027] Un dernier aspect de l’invention est un véhicule automobile comprenant un système de freinage selon le deuxième aspect de l’invention. [0027] A final aspect of the invention is a motor vehicle comprising a braking system according to the second aspect of the invention.
BRÈVE DESCRIPTION DES FIGURES BRIEF DESCRIPTION OF THE FIGURES
[0028] D’autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description détaillée qui suit d’un mode de réalisation de l’invention donné à titre d’exemple nullement limitatif et illustré par les dessins annexés, dans lesquels : Other characteristics and advantages of the present invention will emerge more clearly on reading the following detailed description of an embodiment of the invention given by way of non-limiting example and illustrated by the accompanying drawings, wherein :
[0029] [Fig. 1] représente une architecture de l’implémentation du procédé de pilotage selon la présente invention ; [0029] [Fig. 1] represents an architecture of the implementation of the control method according to the present invention;
[0030] [Fig. 2] représente le positionnement des différents seuils de pression, à savoir de désactivation périodique, de désactivation continu, d’activation continu, et d’activation périodique, les uns par rapport aux autres ; [0030] [Fig. 2] represents the positioning of the different pressure thresholds, namely periodic deactivation, continuous deactivation, continuous activation, and periodic activation, with respect to each other;
[0031] [Fig. 3] représente une stratégie de pilotage de la pompe à vide électrique avec activation et désactivation du mode de fonctionnement périodique et avec activation et désactivation du mode de fonctionnement continu ; [0031] [Fig. 3] represents a strategy for controlling the electric vacuum pump with activation and deactivation of the periodic operating mode and with activation and deactivation of the continuous operating mode;
[0032] [Fig. 4a] représente, en trait tillés, une courbe d’évolution de pression mesurée DP selon un premier cas test, mesurée en millibars, et en mixte traits- points, une courbe d’évolution de pression mesurée DP selon un deuxième cas test, mesurée en millibars, dans le système de freinage à dépression, en fonction du temps t exprimé en secondes ; [0032] [Fig. 4a] represents, in broken lines, a pressure evolution curve DP measured according to a first test case, measured in millibars, and in mixed lines-dots, a pressure evolution curve DP measured according to a second test case, measured in millibars, in the vacuum braking system, as a function of time t expressed in seconds;
[0033] [Fig. 4b] représente trois courbes d’évolutions de décomptes de temps, mesuré en seconde, une première courbe du mode de fonctionnement continu, en trait continu, et du mode de fonctionnement périodique, une première courbe en traits tillés selon le premier cas test, et une deuxième courbe en mixte traits-points selon le deuxième cas test, selon la courbe d’évolution de pression de la figure 4a, en fonction du temps t exprimé en secondes ; [0033] [Fig. 4b] represents three curves of changes in time counts, measured in seconds, a first curve of the continuous operating mode, in continuous line, and of the periodic operating mode, a first curve in broken lines according to the first test case, and a second curve in mixed line-dots according to the second test case, according to the pressure evolution curve of FIG. 4a, as a function of time t expressed in seconds;
[0034] [Fig. 4c] représente deux courbes d’activation et de désactivation du mode de fonctionnement continu, une première courbe en trait continu selon le premier cas test, et une deuxième courbe en mixte traits-points selon le deuxième cas test, selon la courbe d’évolution de pression de la figure 4a, en fonction du temps t exprimé en secondes ; et [0034] [Fig. 4c] represents two curves for activating and deactivating the continuous operating mode, a first curve in solid line according to the first case test, and a second curve in mixed line-dots according to the second test case, according to the pressure evolution curve of FIG. 4a, as a function of time t expressed in seconds; and
[0035] [Fig. 4d] représente une courbe d’activation et de désactivation du mode de fonctionnement périodique, une première courbe en trait continu selon le premier cas test, et une deuxième courbe en mixte traits-points selon le deuxième cas test, selon la courbe d’évolution de pression de la figure 4a, en fonction du temps t exprimé en secondes. [0035] [Fig. 4d] represents an activation and deactivation curve of the periodic operating mode, a first continuous line curve according to the first test case, and a second dash-dot mixed curve according to the second test case, according to the evolution curve pressure in Figure 4a, as a function of time t expressed in seconds.
DESCRIPTION DÉTAILLÉE DETAILED DESCRIPTION
[0036] En particulier, il est fait référence à la Fig. 1 présentant une architecture 1 de l’implémentation du procédé selon la présente invention. Une pompe à vide électrique 2 dans un système de freinage à dépression d’un véhicule automobile est pilotée par un calculateur moteur 3 (eVCU) du véhicule. Les fonctions liées au procédé de pilotage 4 de la pompe à vide 2 sont embarquées dans le soft présent dans le calculateur 3. In particular, reference is made to FIG. 1 presenting an architecture 1 of the implementation of the method according to the present invention. An electric vacuum pump 2 in a vacuum braking system of a motor vehicle is controlled by an engine computer 3 (eVCU) of the vehicle. The functions linked to the control method 4 of the vacuum pump 2 are embedded in the software present in the computer 3.
[0037] Le calculateur eVCU 3 est électriquement connecté à un capteur de pression 6, à un capteur de vitesse du véhicule 7, à un capteur de pression atmosphérique 8, permettant de déterminer l’altitude du véhicule, et à un capteur détectant les appuis du conducteur sur le frein 9. Le capteur de pression 6 mesure la pression DP au sein du système de freinage à dépréssion. The eVCU computer 3 is electrically connected to a pressure sensor 6, to a vehicle speed sensor 7, to an atmospheric pressure sensor 8, making it possible to determine the altitude of the vehicle, and to a sensor detecting the pressure of the driver on the brake 9. The pressure sensor 6 measures the pressure DP within the depression braking system.
[0038] La pompe à vide 2 est connectée à un calculateur d’un correcteur de trajectoire 11 , connu sous la dénomination « Electronic Stability Control » (ESC) ou « Electronic Stability Program » {ESP). En cas de défaillance de la pompe à vide 2, une pompe hydraulique liée au calculateur du correcteur de trajectoire 11 est enclenchée. Cette stratégie de compensations 12 de manque d’assistance au freinage 13, connue sous la dénomination « Hydraulic Brake Boost » et « Hydraulic Brake Failure Compensation » (HBB/HBC), est embarquée dans le calculateur du correcteur de trajectoire 11. The vacuum pump 2 is connected to a computer of a trajectory corrector 11, known under the name "Electronic Stability Control" (ESC) or "Electronic Stability Program" (ESP). In the event of failure of the vacuum pump 2, a hydraulic pump linked to the path corrector computer 11 is activated. This compensation strategy 12 for lack of braking assistance 13, known under the names "Hydraulic Brake Boost" and "Hydraulic Brake Failure Compensation" (HBB / HBC), is embedded in the computer of the trajectory corrector 11.
[0039] En cas de défaillance de la pompe à vide 2, un mode de fonctionnement dégradé, avec différents envois de modes dégradés 14, est ainsi mis en oeuvre par le calculateur 3. Une remontée de défaut signalant une défaillance de fourniture de vide pour le service après-vente 16 est prévue, par exemple via une interface de type GSM, ceci entrant dans le cadre d’une surveillance à distance du véhicule. Un envoi d’un mode dégradé demandant l’activation d’un mode de pilotage périodique dysfonctionnel 17 est prévu, ceci donnant la possibilité d’avoir encore au moins un freinage permettant au conducteur d’arrêter le véhicule. Un allumage voyant STOP (ou Service) informant le conducteur d’une défaillance sur son véhicule, est prévu, ceci alertant sans délai le conducteur et l’obligeant à arrêter le véhicule. In the event of failure of the vacuum pump 2, a degraded operating mode, with various transmissions of degraded modes 14, is thus implemented by the computer 3. A fault report signaling a failure of vacuum supply for 16 after-sales service is provided, for example via an interface of GSM type, this coming within the framework of remote monitoring of the vehicle. A sending of a degraded mode requesting the activation of a dysfunctional periodic control mode 17 is provided, this giving the possibility of still having at least one braking allowing the driver to stop the vehicle. A STOP (or Service) warning light is provided, informing the driver of a fault in his vehicle, this immediately alerting the driver and obliging him to stop the vehicle.
[0040] Le besoin en vide, détecté par le capteur de pression 6, commande la mise en marche de la pompe à vide électrique 2, en fonction d’un seuil de pression inférieur d’activation continu DPon et d’un seuil de pression supérieur de désactivation continu DPoff (voir Fig. 2). Le seuil de pression supérieur de désactivation continu DPoff est supérieur au seuil de pression inférieur d’activation continu DPon. Dès qu’un niveau de dépression cible est atteint entre DPon et DPoff, la pompe à vide électrique 2 s’arrête. The vacuum requirement, detected by the pressure sensor 6, controls the starting of the electric vacuum pump 2, as a function of a lower pressure threshold of continuous activation DPon and of a pressure threshold upper continuous deactivation DPoff (see Fig. 2). The upper continuous deactivation pressure threshold DPoff is greater than the lower continuous deactivation pressure threshold DPon. As soon as a target vacuum level is reached between DPon and DPoff, the electric vacuum pump 2 stops.
[0041] Selon la présente invention, le procédé 19 de pilotage de la pompe à vide électrique 2 demande l’introduction de deux nouveaux seuils d’activation et de désactivation, à savoir un seuil de pression inférieur d’activation périodique DPon’ et un seuil de pression supérieur de désactivation périodique DPoff. Les seuils d’activation et de désactivation sont positionnés dans l’ordre qui suit et ne doivent pas se chevaucher entre eux : seuil de pression de désactivation périodique DPoff, seuil de désactivation continu DPoff, seuil d’activation continu DPon, et seuil de pression d’activation périodique DPon’. Le seuil de pression supérieur de désactivation périodique DPoff est supérieur au seuil de pression supérieur de désactivation continu DPoff. Le seuil de pression supérieur de désactivation continu DPoff est supérieur au seuil de pression inférieur d’activation continu DPon. Et le seuil de pression inférieur d’activation continu DPon est supérieur au seuil de pression inférieur d’activation périodique DPon’. According to the present invention, the method 19 for controlling the electric vacuum pump 2 requires the introduction of two new activation and deactivation thresholds, namely a lower pressure threshold for periodic activation DPon 'and a DPoff periodic deactivation upper pressure threshold. The activation and deactivation thresholds are positioned in the following order and must not overlap: periodic deactivation pressure threshold DPoff, continuous deactivation threshold DPoff, continuous activation threshold DPon, and pressure threshold periodic activation DPon '. The upper pressure threshold for periodic deactivation DPoff is greater than the upper pressure threshold for continuous deactivation DPoff. The upper continuous deactivation pressure threshold DPoff is greater than the lower continuous deactivation pressure threshold DPon. And the DPon continuous activation lower pressure threshold is greater than the DPon periodic activation lower pressure threshold.
[0042] Comme le représente la Fig. 3, et selon la présente invention, le procédé 19 de pilotage de la pompe à vide électrique 2 comprend deux modes de fonctionnement, à savoir un mode de fonctionnement continu et un mode de fonctionnement périodique. [0043] Pour obtenir une activation du mode de fonctionnement périodique 21 de la pompe à vide 2, et ainsi une désactivation du mode de fonctionnement continu de la pompe à vide 2, les conditions cumulatives « ET » 22 sont les suivantes. As shown in FIG. 3, and according to the present invention, the method 19 for controlling the electric vacuum pump 2 comprises two operating modes, namely a continuous operating mode and a periodic operating mode. To obtain an activation of the periodic operating mode 21 of the vacuum pump 2, and thus a deactivation of the continuous operating mode of the vacuum pump 2, the cumulative conditions "AND" 22 are as follows.
[0044] En première condition obligatoire 23, la durée d’activation continue de la pompe à vide 2 doit être supérieure à une première durée déterminée t1. Par exemple t1 > 30s. Mais également en critère alternatif, la pression mesurée DP doit être supérieure à un seuil de pression inférieur d’activation continu DPon et inférieure ou égale à un seuil de pression supérieur de désactivation continu DPoff. As the first mandatory condition 23, the duration of continuous activation of the vacuum pump 2 must be greater than a first determined duration t1. For example t1> 30s. But also as an alternative criterion, the measured pressure DP must be greater than a lower pressure threshold for continuous activation DPon and less than or equal to an upper pressure threshold for continuous deactivation DPoff.
[0045] En deuxième condition obligatoire 24, une vitesse du véhicule V est inférieure à une vitesse seuil V s. La vitesse seuil du véhicule V s doit être faible, par exemple V < 30km/h. In second mandatory condition 24, a vehicle speed V is less than a threshold speed V s. The threshold speed of the vehicle V s must be low, for example V <30 km / h.
[0046] En troisième condition obligatoire 26, une altitude du véhicule est comprise entre une altitude minimale Hmin et une altitude maximale Hmax. L’altitude doit par exemple être comprise entre 0 (Hmin) et 3000 m (Hmax). [0047] Dès que la pompe à vide 2 passe du mode de fonctionnement continu au mode de fonctionnement périodique 21 , un décompte de la temporisation d’activation périodique 27 est activé. In third mandatory condition 26, an altitude of the vehicle is between a minimum altitude Hmin and a maximum altitude Hmax. The altitude must for example be between 0 (Hmin) and 3000 m (Hmax). As soon as the vacuum pump 2 switches from continuous operating mode to periodic operating mode 21, a countdown of the periodic activation delay 27 is activated.
[0048] Pour obtenir une désactivation du mode de fonctionnement périodique 28 de la pompe à vide 2, et ainsi une activation du mode de fonctionnement continu de la pompe à vide 2, une seule des conditions non cumulatives « OU » 29 suivantes doit être remplie. To obtain a deactivation of the periodic operating mode 28 of the vacuum pump 2, and thus an activation of the continuous operating mode of the vacuum pump 2, only one of the following non-cumulative "OR" conditions 29 must be met .
[0049] En première condition facultative 31 , la pression mesurée DP peut dépasser ou être égale au seuil supérieur de désactivation périodique DPoff : DP > DPoff. Dans ce cas, le mode périodique et le mode continu est arrêté, le seuil de dépression cible étant atteint. In the first optional condition 31, the measured pressure DP can exceed or be equal to the upper threshold of periodic deactivation DPoff: DP> DPoff. In this case, the periodic mode and the continuous mode are stopped, the target depression threshold being reached.
[0050] En deuxième condition facultative 32, la pression mesurée DP peut dépasser le seuil inférieur de désactivation périodique DPon’ : DP < DPon’. Dans ce cas, le pilotage de la pompe à vide 2 rebascule alors sur une activation continue. As a second optional condition 32, the measured pressure DP can exceed the lower threshold of periodic deactivation DPon ": DP <DPon". In this case, the control of the vacuum pump 2 then switches back to continuous activation.
[0051] En troisième condition facultative 33, la pression mesurée DP peut rester au- dessus du seuil de pression supérieur de désactivation continu DPoff, mais peut rester en-dessous du seuil supérieur de désactivation périodique DPoff, pendant une temporisation t2. Par exemple t2 = 30s. Au bout de 30s, le mode périodique s’arrête et la pompe à vide 2 va automatiquement s'arrêter car la pression DP est au-dessus du seuil de pression supérieur de désactivation continu DPoff. In the third optional condition 33, the measured pressure DP can remain above the upper pressure threshold of continuous deactivation DPoff, but can remain below the upper threshold of periodic deactivation DPoff, during a time delay t2. For example t2 = 30s. At the end of 30s, the periodic mode stops and the vacuum pump 2 will automatically stop because the pressure DP is above the upper pressure threshold of continuous deactivation DPoff.
[0052] En quatrième condition facultative 34, la pression mesurée DP peut rester en- dessous du seuil inférieur d’activation continu DPon, mais non en-dessous du seuil inférieur de désactivation périodique DPon’, pendant une temporisation t3. Par exemple t3 = 30s. Au bout de 30s, le mode périodique s’arrête, le mode continu est réactivé et la pompe à vide 2 va automatiquement repartir en mode continu car la pression DP est en-dessous du seuil de pression inférieur d’activation continu DPon. In the fourth optional condition 34, the measured pressure DP can remain below the lower continuous activation threshold DPon, but not below the lower periodic deactivation threshold DPon ′, for a time delay t3. For example t3 = 30s. After 30s, the periodic mode stops, the continuous mode is reactivated and the vacuum pump 2 will automatically restart in continuous mode because the pressure DP is below the lower pressure threshold for continuous activation DPon.
[0053] Différentes courbes de pression mesurée DP ainsi que les conséquences sur le pilotage de la pompe à vide 2 sont représentées dans les Figs. 4a-4d. Ces courbes correspondent à des situations qui concernent les conditions d’activation et de désactivation du mode périodique. L’enclenchement de l’activation périodique fonctionnelle ne peut se faire qu’après avoir eu une activation longue continue au préalable (de 30s ou inférieure), pour tous les cas de figure qui suivent ci-dessous. Different curves of the measured pressure DP as well as the consequences on the control of the vacuum pump 2 are shown in FIGS. 4a-4d. These curves correspond to situations which concern the conditions for activating and deactivating the periodic mode. The activation of the functional periodic activation can only be done after having had a long continuous activation beforehand (of 30s or less), for all the following cases below.
[0054] Si le conducteur cesse tout contact avec le frein et que la pression mesurée DP reste continûment entre le seuil de pression inférieur d’activation continu DPon et le seuil de pression supérieur de désactivation continu DPoff, la pompe à vide 2 est activée en continu pendant 15s. La pression mesurée DP remonte 36 et dépasse le seuil de pression inférieur d’activation continu DPon, mais reste en deçà du seuil de pression supérieur de désactivation continu DPoff. L’activation continue reste jusqu’à l’écoulement des 30s, puis le pilotage bascule en mode périodique, au-delà des 20s prévues, car la pression mesurée DP reste en-dessous du seuil de pression supérieur de désactivation continu DPoff, jusqu’à t=100s. Le mode périodique est continu et se maintient au-delà des 20s. Ceci correspond a une activation périodique durable. If the driver ceases all contact with the brake and the measured pressure DP remains continuously between the lower continuous activation pressure threshold DPon and the upper continuous deactivation pressure threshold DPoff, the vacuum pump 2 is activated in continuous for 15s. The measured pressure DP rises 36 and exceeds the lower continuous activation pressure threshold DPon, but remains below the upper continuous deactivation pressure threshold DPoff. The continuous activation remains until the end of the 30s, then the control switches to periodic mode, beyond the 20s provided, because the measured pressure DP remains below the upper pressure threshold of continuous deactivation DPoff, until at t = 100s. The periodic mode is continuous and is maintained beyond 20s. This corresponds to a lasting periodic activation.
[0055] La temporisation de 20s du mode périodique se déclenche 37, au-delà des 15s en continu, mais comme la pression DP reste bloquée entre les seuils de pression inférieur d’activation continu DPon et supérieur de désactivation continu DPoff, l’activation périodique continue au-delà de la temporisation. The 20s time delay of the periodic mode is triggered 37, beyond the 15s continuously, but as the pressure DP remains blocked between the lower continuous activation pressure thresholds DPon and upper continuous deactivation DPoff, the activation periodic continues beyond the timeout.
[0056] La pression mesurée DP franchit 38 le seuil inférieur de désactivation périodique DPon’. L’activation périodique cesse alors et le pilotage de la pompe à vide 2 rebascule en activation continue. Dans ce cas l’activation continue dure 40s non stop, au-delà de la temporisation car la pression mesurée DP reste bloquée en- dessous du le seuil inférieur de désactivation périodique DPon’. The measured pressure DP crosses 38 the lower threshold of periodic deactivation DPon '. Periodic activation then ceases and control of the pump empty 2 switches back to continuous activation. In this case the continuous activation lasts 40s non-stop, beyond the time delay because the measured pressure DP remains blocked below the lower threshold of periodic deactivation DPon '.
[0057] La pression mesurée DP remonte, le pilotage de la pompe à vide 2 repasse en activation périodique entre les seuils de pression inférieur d’activation continu DPon et supérieur de désactivation continu DPoff, au-delà des 20s d’activation périodique prévues. The measured pressure DP rises, the control of the vacuum pump 2 returns to periodic activation between the lower pressure thresholds for continuous activation DPon and upper continuous deactivation DPoff, beyond the 20s of periodic activation provided.
[0058] Lorsque le seuil inférieur de désactivation périodique DPon’ est dépassé 41 , le pilotage de la pompe à vide 2 quitte l’activation périodique pour l’activation continue. When the lower threshold of periodic deactivation DPon ’is exceeded 41, the control of the vacuum pump 2 leaves the periodic activation for continuous activation.
[0059] Si le conducteur cesse immédiatement tout contact avec le frein au démarrage du mode périodique, le pilotage de la pompe à vide 2 sort alors du mode périodique 42, avant les 20s prévues car la pression mesurée DP va rapidement être supérieure au seuil supérieur de désactivation périodique DPoff. If the driver immediately ceases all contact with the brake at the start of the periodic mode, the control of the vacuum pump 2 then exits the periodic mode 42, before the 20s provided because the measured pressure DP will quickly be greater than the upper threshold periodic deactivation DPoff.
[0060] L’activation périodique 42 se relance un bref instant, au moment où le seuil de pression inférieur d’activation continu DPon est franchit, car la pression mesurée DP se retrouve dans la zone entre le seuil de pression supérieur de désactivation continu DPoff et le seuil supérieur de désactivation périodique DPoff. L’activation périodique 42 s’interrompt au moment où le seuil supérieur de désactivation périodique DPoff est dépassé. Periodic activation 42 is restarted briefly, when the lower continuous activation pressure threshold DPon is crossed, because the measured pressure DP is found in the area between the upper continuous deactivation pressure threshold DPoff and the upper threshold of periodic deactivation DPoff. Periodic activation 42 is interrupted when the upper threshold of periodic deactivation DPoff is exceeded.
[0061] Lorsque la pression mesurée DP reste stable 43, le pilotage n’engendre pas d’activation de la pompe à vide 2, car la pression mesurée DP se trouve au-dessus du seuil de pression inférieur d’activation continu DPon, donc pas d’activation du mode ni continu ni d’activation du mode périodique. When the measured pressure DP remains stable 43, the control does not cause activation of the vacuum pump 2, because the measured pressure DP is above the lower continuous activation pressure threshold DPon, therefore neither continuous mode activation nor periodic mode activation.
[0062] L’activation continue 44 se lance dès que le seuil de pression inférieur d’activation continu DPon est franchit, au bout de 20s. The continuous activation 44 starts as soon as the lower pressure threshold of continuous activation DPon is crossed, after 20s.
[0063] Si le conducteur appuie plus légèrement sur la pédale de frein et que la pression mesurée DP passe au-dessus de seuil de pression supérieur de désactivation continu DPoff, mais reste en-dessous du seuil supérieur de désactivation périodique DPoff pendant le temps de la temporisation, au bout de 20s le mode périodique s’arrête 46. Le pilotage arrête l’activation de la pompe à vide électrique 2. La pression mesurée DP franchit le seuil de pression supérieur de désactivation continu DPoff. L’activation périodique s’enclenche sur 20s uniquement, car la pression est au-dessus du seuil de pression supérieur de désactivation continu DPoff. Et comme la pression mesurée DP ne franchit pas le seuil supérieur de désactivation périodique DPoff, la pompe à vide 2 se coupe alors au bout des 20s. If the driver presses the brake pedal more lightly and the measured pressure DP goes above the upper pressure threshold for continuous deactivation DPoff, but remains below the upper threshold for periodic deactivation DPoff during the time of the time delay, after 20s the periodic mode stops 46. The piloting stops the activation of the electric vacuum pump 2. The measured pressure DP crosses the upper pressure threshold of continuous deactivation DPoff. Periodic activation is triggered for 20s only, because the pressure is above the upper pressure threshold for continuous deactivation DPoff. And since the measured pressure DP does not cross the upper threshold of periodic deactivation DPoff, the vacuum pump 2 then switches off after 20s.
[0064] L’activation continue 47 se lance dès que le seuil de pression inférieur d’activation continu DPon est franchit, au bout de 20s. The continuous activation 47 starts as soon as the lower pressure threshold of continuous activation DPon is crossed, after 20s.
[0065] Si le conducteur appuie plus violemment qu’avant sur la pédale de frein et que la pression mesurée DP passe en-dessous du seuil de pression inférieur d’activation continu DPon, mais non en-dessous du seuil inférieur de désactivation périodique DPon’ pendant le temps de la temporisation, au bout de 20s le mode périodique s’arrête 48. Au début de cette situation, la pompe à vide électrique 2 est activée dans le mode de fonctionnement continu. L’activation continue se lance dès que le seuil de pression inférieur d’activation continu DPon est franchit et dure 30s. Au bout de ces 30s d’activation continue, le pilotage de la pompe à vide 2 bascule en mode périodique. La pression mesurée DP reste bloquée entre le seuil de pression inférieur d’activation continu DPon et le seuil inférieur de désactivation périodique DPon’. If the driver presses the brake pedal more violently than before and the measured pressure DP goes below the lower continuous activation pressure threshold DPon, but not below the lower periodic deactivation threshold DPon 'during the time delay, after 20s the periodic mode stops 48. At the start of this situation, the electric vacuum pump 2 is activated in the continuous operating mode. The continuous activation starts as soon as the lower pressure threshold of continuous activation DPon is crossed and lasts 30s. At the end of these 30s of continuous activation, the control of the vacuum pump 2 switches to periodic mode. The measured pressure DP remains stuck between the lower continuous activation pressure threshold DPon and the lower periodic deactivation threshold DPon '.
[0066] Vers la fin de la situation de freinage précédente, l’activation périodique 49 s’enclenche alors sur les 20s, mais comme la pression mesurée DP reste bloquée entre le seuil de pression inférieur d’activation continu DPon et le seuil inférieur de désactivation périodique DPon’, le pilotage rebascule en activation continue. Towards the end of the previous braking situation, the periodic activation 49 then engages over the 20s, but as the measured pressure DP remains blocked between the lower continuous activation pressure threshold DPon and the lower threshold of periodic deactivation DPon ', the control switches back to continuous activation.
[0067] Si le conducteur effectue des appuis frein insistant et répétés, la pression mesurée DP passe 51 en-dessous du seuil inférieur de désactivation périodique DPon’, avant la période des 20s, le pilotage de la pompe à vide 2 sort du mode périodique. Le pilotage rebascule dans une activation longue de la pompe à vide 2. L’activation périodique s’enclenche un bref instant, au moment où le seuil de pression inférieur d’activation continu DPon est franchit. La pression mesurée DP se retrouve dans la zone entre le seuil de pression inférieur d’activation continu DPon et le seuil inférieur de désactivation périodique DPon’. Le pilotage rebascule en activation continue dès que le seuil inférieur de désactivation périodique DPon’ est franchit. Dans cette situation 51, l’activation périodique est prioritaire sur l’activation continue, sur les 10s. If the driver performs insistent and repeated brake pressure, the measured pressure DP passes 51 below the lower threshold of periodic deactivation DPon ', before the period of 20s, the control of the vacuum pump 2 exits periodic mode . The control switches back to a long activation of the vacuum pump 2. The periodic activation is triggered briefly, when the lower continuous activation pressure threshold DPon is crossed. The measured pressure DP is found in the zone between the lower continuous activation pressure threshold DPon and the lower periodic deactivation threshold DPon '. The control switches back to continuous activation as soon as the lower periodic deactivation threshold DPon 'is crosses. In this situation 51, periodic activation takes priority over continuous activation, over 10s.
[0068] Diverses modifications et/ou améliorations peuvent être apportées par l’homme du métier aux différents modes de réalisation de l’invention décrits dans la présente description sans sortir du cadre de l’invention. Si la présente invention présente un capteur de pression relatif, le capteur peut être également un capteur de pression absolu. Dans ce cas de figure, les seuils d’activation-désactivation sont donc inversés par rapport à ce qui a été précédemment décrit.! Various modifications and / or improvements can be made by those skilled in the art to the various embodiments of the invention described in the present description without departing from the scope of the invention. If the present invention presents a relative pressure sensor, the sensor can also be an absolute pressure sensor. In this case, the activation-deactivation thresholds are therefore reversed compared to what has been previously described.!

Claims

REVENDICATIONS
[Revendication 1] procédé de pilotage d’une pompe à vide électrique (2) dans un système de freinage à dépression pour un véhicule, comprenant les étapes consistant à : [Claim 1] method of controlling an electric vacuum pump (2) in a vacuum braking system for a vehicle, comprising the steps of:
- mesurer une pression (DP) dans le système de freinage, et - measure a pressure (DP) in the braking system, and
- piloter la pompe à vide (2) selon un mode de fonctionnement continu ou un mode de fonctionnement périodique, le pilotage de la pompe à vide (2) passant du mode de fonctionnement continu au mode de fonctionnement périodique, et inversement, au moins en fonction de la pression mesurée (DP) dans le système de freinage. [Revendication 2] Procédé selon la revendication 1 , caractérisé en ce que le pilotage de la pompe à vide (2) passe du mode de fonctionnement continu au mode de fonctionnement périodique, lorsque les conditions suivantes sont simultanément remplies : - control the vacuum pump (2) according to a continuous operating mode or a periodic operating mode, the control of the vacuum pump (2) changing from continuous operating mode to periodic operating mode, and vice versa, at least in function of the measured pressure (DP) in the braking system. [Claim 2] A method according to claim 1, characterized in that the control of the vacuum pump (2) changes from continuous operating mode to periodic operating mode, when the following conditions are simultaneously fulfilled:
- une durée d’activation continue (t) de la pompe à vide - a continuous activation time (t) of the vacuum pump
(2) est supérieure à une première durée déterminée (t1), ou la pression mesurée (DP) est supérieure à un seuil de pression inférieur d’activation continu (DPon) et inférieure ou égale à un seuil de pression supérieur de désactivation continu (DPoff), (2) is greater than a first determined duration (t1), or the measured pressure (DP) is greater than a lower continuous activation pressure threshold (DPon) and less than or equal to an upper continuous deactivation pressure threshold ( DPoff),
- une vitesse du véhicule (V) est inférieure à une vitesse seuil (Vs), - a vehicle speed (V) is less than a threshold speed (Vs),
- une altitude du véhicule est comprise entre une altitude minimale (Hmin) et une altitude maximale (Hmax). - an altitude of the vehicle is between a minimum altitude (Hmin) and a maximum altitude (Hmax).
[Revendication 3] Procédé selon la revendication 2, caractérisé en ce que le seuil de pression supérieur de désactivation continu (DPoff) est supérieur au seuil de pression inférieur d’activation continu (DPon). [Claim 3] A method according to claim 2, characterized in that the upper continuous deactivation pressure threshold (DPoff) is greater than the lower continuous activation pressure threshold (DPon).
[Revendication 4] Procédé selon l’une des revendications précédentes, caractérisé en ce que le pilotage de la pompe à vide (2) passe du mode de fonctionnement périodique au mode de fonctionnement continu, lorsqu’une seule des conditions suivantes est remplie : [Claim 4] Method according to one of the preceding claims, characterized in that the control of the vacuum pump (2) changes from periodic operating mode to continuous operating mode, when only one of the following conditions is met:
- la pression mesurée (DP) est supérieure ou égale à un seuil de pression supérieur de désactivation périodique (DPoff), - the measured pressure (DP) is greater than or equal to a higher pressure threshold for periodic deactivation (DPoff),
- la pression mesurée (DP) est inférieure à un seuil de pression inférieur d’activation périodique (DPon’), - the measured pressure (DP) is below a lower pressure threshold for periodic activation (DPon ’),
- la pression mesurée (DP) est supérieure à un seuil de pression supérieur de désactivation continu (DPoff) et inférieure au seuil de pression supérieur de désactivation périodique (DPoff) pendant une deuxième durée déterminée (t2),- the measured pressure (DP) is greater than an upper continuous deactivation pressure threshold (DPoff) and lower than the upper pressure threshold of periodic deactivation (DPoff) for a second determined period (t2),
- la pression mesurée (DP) est inférieure à un seuil de pression inférieur d’activation continu (DPon) et supérieure à un seuil de pression inférieur d’activation périodique (DPon’) pendant une troisième durée déterminée (t3). - the measured pressure (DP) is less than a lower continuous activation pressure threshold (DPon) and greater than a lower periodic activation pressure threshold (DPon ’) for a third determined period (t3).
[Revendication 5] Procédé selon la revendication 4, caractérisé en ce que le seuil de pression supérieur de désactivation périodique (DPoff) est supérieur au seuil de pression supérieur de désactivation continu (DPoff), en ce que le seuil de pression supérieur de désactivation continu (DPoff) est supérieur au seuil de pression inférieur d’activation continu (DPon), et en ce que le seuil de pression inférieur d’activation continu (DPon) est supérieur au seuil de pression inférieur d’activation périodique (DPon’). [Claim 5] A method according to claim 4, characterized in that the upper pressure threshold for periodic deactivation (DPoff) is greater than the upper pressure threshold for continuous deactivation (DPoff), in that the upper pressure threshold for continuous deactivation (DPoff) is greater than the lower pressure threshold for continuous activation (DPon), and in that the lower pressure threshold for continuous activation (DPon) is greater than the lower pressure threshold for periodic activation (DPon ').
[Revendication 6] Procédé selon la revendication 4 ou 5, caractérisé en ce que le pilotage de la pompe à vide (2) reste dans le mode de fonctionnement périodique au-delà d’une quatrième durée déterminée, lorsque la pression mesurée (DP) est supérieure à un seuil de pression inférieur d’activation continu (DPon) et inférieure ou égale à un seuil de pression supérieur de désactivation continu (DPoff). [Claim 6] A method according to claim 4 or 5, characterized in that the control of the vacuum pump (2) remains in the periodic operating mode beyond a fourth determined period, when the measured pressure (DP) is greater than a lower continuous activation pressure threshold (DPon) and less than or equal to an upper continuous deactivation pressure threshold (DPoff).
[Revendication 7] Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce qu’il comprend une étape supplémentaire, en cas d’une surchauffe ou d’un endommagement de la pompe à vide (2), suite à une activation longue continue, consistant à enclencher au moins un des modes dégradés suivants, avec : [Claim 7] A method according to any one of the preceding claims, characterized in that it comprises an additional step, in the event of overheating or damage to the vacuum pump (2), following a long activation. continuous, consisting in triggering at least one of the following degraded modes, with:
- un envoi d’un signal au service après-vente, signalant une défaillance de la pompe à vide (2), - sending a signal to the after-sales service, indicating a failure of the vacuum pump (2),
- une activation d’un mode de pilotage périodique dysfonctionnel de la pompe à vide- activation of a dysfunctional periodic control mode of the vacuum pump
(2), (2),
- un allumage d’un voyant au tableau de bord, correspondant à une défaillance du véhicule, - an indicator light on the dashboard, corresponding to a vehicle failure,
- une activation d’une pompe hydraulique d’un correcteur électronique de trajectoire (11 ). - activation of a hydraulic pump and an electronic trajectory corrector (11).
[Revendication 8] Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que le pilotage de la pompe à vide (2) est mis en oeuvre à l’aide d’un calculateur moteur du véhicule (3). [Claim 8] A method according to any one of the preceding claims, characterized in that the control of the vacuum pump (2) is implemented using a vehicle engine computer (3).
[Revendication 9] Système de freinage à dépression pour un véhicule, comprenant une pompe à vide électrique (2), le pilotage de la pompe à vide (2) étant mise en œuvre conformément au procédé selon l’une quelconque des revendications précédentes. [Claim 9] A vacuum braking system for a vehicle, comprising an electric vacuum pump (2), the control of the vacuum pump (2) being implemented in accordance with the method according to any one of the preceding claims.
[Revendication 10] Véhicule automobile comprenant un système de freinage selon la revendication 9. [Claim 10] A motor vehicle comprising a braking system according to claim 9.
PCT/FR2021/050196 2020-03-10 2021-02-03 Method for controlling an electric vacuum pump in a vacuum braking system for a vehicle WO2021181016A1 (en)

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FRFR2002335 2020-03-10
FR2002335A FR3108079A1 (en) 2020-03-10 2020-03-10 PROCESS FOR CONTROL OF AN ELECTRIC VACUUM PUMP IN A VACUUM BRAKING SYSTEM FOR A VEHICLE

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2002335A1 (en) 1968-02-21 1969-10-17 Allied Chem ALUMINUM TRIFLUORIDE PRODUCTION PROCESS
EP2726351A1 (en) 2011-07-01 2014-05-07 Jaguar Land Rover Limited Method of controlling vacuum pump for vehicle brake booster
FR3012097A1 (en) * 2013-10-23 2015-04-24 Renault Sa MANAGING DIFFERENTIAL PRESSURE THRESHOLDS OF A VACUUM PUMP RELATED TO A MOTOR VEHICLE BRAKE SYSTEM
WO2015189673A1 (en) * 2014-06-11 2015-12-17 Toyota Jidosha Kabushiki Kaisha Vehicle control apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2002335A1 (en) 1968-02-21 1969-10-17 Allied Chem ALUMINUM TRIFLUORIDE PRODUCTION PROCESS
EP2726351A1 (en) 2011-07-01 2014-05-07 Jaguar Land Rover Limited Method of controlling vacuum pump for vehicle brake booster
FR3012097A1 (en) * 2013-10-23 2015-04-24 Renault Sa MANAGING DIFFERENTIAL PRESSURE THRESHOLDS OF A VACUUM PUMP RELATED TO A MOTOR VEHICLE BRAKE SYSTEM
WO2015189673A1 (en) * 2014-06-11 2015-12-17 Toyota Jidosha Kabushiki Kaisha Vehicle control apparatus

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