GB2338762A - Safety and anti-theft device for a vehicle - Google Patents
Safety and anti-theft device for a vehicle Download PDFInfo
- Publication number
- GB2338762A GB2338762A GB9810682A GB9810682A GB2338762A GB 2338762 A GB2338762 A GB 2338762A GB 9810682 A GB9810682 A GB 9810682A GB 9810682 A GB9810682 A GB 9810682A GB 2338762 A GB2338762 A GB 2338762A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- braking
- vehicle
- auxiliary
- distributor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
- B60R25/08—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on brakes or brake systems
Abstract
A safety and anti-theft device for a vehicle comprises an auxiliary hydraulic circuit 12 having a pump 22 driven by an electric motor 20, an isolating valve 14, a distributor 16, and control means 38. In normal use, the auxiliary circuit is isolated by valve 14 and the electrically operated slide valve of the distributor allows direct operation of the brakes by the master cylinder. When the ignition is switched on and an incorrect number is keyed into pad 42, the valve 14 adopts the illustrated position and distributor slide valve is moved to allow fluid from the auxiliary circuit to flow via inlet 36 and at least one outlet 34 to the associated brake(s), thus locking the wheel(s) and preventing theft. The control means may also lock the wheels in response to release of the handbrake 48 when the vehicle is on a slope. In a further embodiment, the distributor slide valve is operated hydraulically.
Description
SAFETY AND ANTI-THEFT DEVICE 1 2338762 The present invention concerns a
safety and anti-theft device, in particular for motor vehicles, but also for any vehicle having a hydraulic braking system. This device operates by locking one or more wheels by acting on the hydraulic braking circuit of the vehicle.
Anti-theft devices for motor vehicles acting on the braking circuit of the vehicle are already known. Document FR 2 647 071 describes a device for a circuit comprising a master cylinder coupled by pipelines to a receiver on each wheel of the vehicle. The invention described in this document proposes to provide this hydraulic assembly with a hydraulic accumulator and a distribution valve associated with the master cylinder.
In the various embodiments described in this document, the driver arms the anti-theft device before leaving the vehicle and the brake or brakes of this vehicle remain locked during all the period that the vehicle is immobilized.
Document FR 2 714 005 describes another anti-theft device acting on a braking circuit of the vehicle, in which a mechanical pressure generator is added to the hydraulic braking circuit of the vehicle to maintain a permanent braking force during all the period that the vehicle is immobilized. This pressure generator includes a spring under stress acting on a piston or on a diaphragm.
The disadvantage of the aforementioned devices is that the braking circuit is under pressure during all the period that the vehicle is immobilized. The braking circuits of the vehicle are not designed by the manufacturers to remain under stress for such long periods of time. There is thus a risk of leakages of hydraulic fluid appearing prematurely on vehicles fitted with such an anti-theft device. Moreover, if the brake pads remain under stress for a long 1 2 time, there are risks of seizing. It is then possible that the pads do not return to their rest position when the anti-theft device is disarmed.
Finally, the systems referred to above only operate when the driver actuates them before leaving the vehicle.
The object of the present invention is then to provide a device acting on a hydraulic braking circuit for which the braking circuit is not under pressure during all the period that the vehicle is immobilized. Preferably, this device operates without a positive action by the driver when the latter leaves his or her vehicle.
Accordingly, the present invention provides a safety and anti theft device for a vehicle, in particular a motor vehicle, including a hydraulic braking circuit supplying from a master cylinder at least one braking device situated on a wheel of the veh-'cle, characterized in that li comprises:
- an auxiliary hydraulic circuit having means for putting hydraulic fluid under pressure, - means of selection enabling at least one braking device to be supplied either from the braking circuit or from the auxiliary circuit, and - means of control making it possible to act on the means of selection.
Thus, in order to lock at least one wheel of the vehicle, it is sufficient to put the fluid under pressure in the auxiliary hydraulic circuit and to place the means of selection into the position in which at least one braking device is supplied by the auxiliary circuit. The means of 3 control make it possible to act on the means of selection only in the case of predetermined figures. It is then quite unnecessary to lock the wheel or wheels during all the period that the vehicle is immobilized. It is sufficient to lock the wheels when an unauthorized user, or one suspected to be such, attempts to drive the vehicle away. This device is also a safety device, since it can prevent the vehicle from moving under certain conditions, for example when the ignition is not switched on. Thus, if for example provision is made for at least one wheel to be locked when the ignition is not switched on and the handbrake is released, in the case where children play in the vehicle and release the handbrake while the vehicle is on a slope, an accident may be av oided.
Preferably, the hydraulic circuit includes a pump, a hydraulic fluid reservoir and a pressure accumulator. Preferably, the pump is supplied with powe-- from an independent battery. An interruption in the supply which would be caused by cutting the supply w--res would not make the cevice inoperative.
The means of selection. can. include a distributor with a slide valve supplied with hydraulic fluid from the master cylinder of the braking circuit and from the auxiliary circuit and distributing the fluid received to at least one braking device of the vehicle, it being possible for the slide valve to take up a first position in which the braking devices are supplied from the braking circuit and a second position in which the braking devices are supplied by the auxiliary hydraulic circuit.
The means of selection may additionally include a three-way valve mounted upstream from the distributor on the auxiliary circuit, a valve which in one position isolates the auxiliary hydraulic circuit and which in another 4 position puts the auxiliary hydraulic circuit into connection with the distributor. Preferably, the pressurized hydraulic fluid of the auxiliary hydraulic circuit controls the movement of the slide valve.
The means of control preferably act on the means of selection in relation to information received by the sensors. For example, a sensor makes it possible to detect whet"-er a parking brake mounted on the vehicle has been activated. This in particular prevents the vehicle from moving,,jhen -the handbrake is inadvertently released.
In order to make it possible to ident-Lfv whether the user an authorized user, the means of contro' can include a key board for entering numerical or alphanumerical daia making possible to key in a confidential code. In th--s case, the means of control preferably include a timer started for example by ope-rating a lock so as to all:v a crecieEe-rm--ned period of time to elapse between the action of the timer and sending a command to the selec---,c-i at least one braking device, so as to allow time -fo-a,se- to enter the conf-Ldential code on the '1"e,,;'--oard the safety and ar.ti-the"L't. device into action.
is io act on In any case, the invention will be best understood with the aid of the following description, with reference to the accompanying schematic drawings, representing by way of non-limiting examples two embodiments of a device according to the invention.
Figures 1 and 2 are each a schematic view of a hydraulic braking circuit of a vehicle provided with a safety and anti-theft device according to the invention.
1 1 Figure 1 shows a braking circuit of the type of those currently encountered on a motor vehicle. This circuit is designed to apply the brakes of four wheels 2, each provided with a braking device 4, for example a hydraulically operated disc brake. A brake pedal 6 makes it possible to operate the braking devices 4 via the master cylinder 8. A vacuum-assisted braking device 10 is shown in the figures.
The device according to the invention shown in figure 1 includes an auxiliary hydraulic circuit 12, a three-way valve 14, a distributor 16 and means of control 18 for operating the device.
The auxiliary hydraulic circuit 12 includes an electric motor 20 driving a hydraulic pump 22. A hydraulic fluid reservoir 24 is provided to supply the pump. The latter sends the pumped liquid through a non-return valve 26 into an accumulator 28. The electric motor 20 is connected to an independent battery 30 which is preferably rechargeable by an alternator (not shown).
The three-way valve 14 may take two positions. In a first position, that shown in the figures, the auxiliary circuit 12 is connected to the braking circuit. In the other position, the auxiliary circuit 12 is isolated hydraulically from the braking circuit.
The distributor 16 of figure 1 is a distributor with a slide valve. The slide valve is actuated electrically and its movement is controlled by the means of control 18. it includes four inlets 32 and four outlets 34, each corresponding to a wheel 2 of the vehicle and to a braking device 4 associated with this wheel 2. Each inlet 32 is directly connected to the master cylinder 8. As regards the outlets 34, these are connected to the braking devices 4.
6 A fifth inlet 36 is provided on the distributor 16. It is connected to the auxiliary circuit 12. It is thus supplied with hydraulic fluid when the three-way valve 14 is in its first position, namely that shown in the figures.
The slide valve of the distributor 16 may take up two positions. In a first position, the inlets 32 are in direct communication with the outlets 34. The device according to the invention does not act at all on the braking device. The brakes then operate normally.
In the second position of the slide valve of the distributor 16, the inlet 36 is connected to the outlet 34 and the inlets 32 of the distributor 16 are closed. The braking devices 4 of the wheels 2 of the vehicle are thus supplied with hydraulic fluid by the auxiliary hydraulic circuit 12. Braking of the vehicle is no longer ensured by operating the brake pedal 6 but is ensured by the pump 22 driven by the motor 20. When the slide valve of the distributor 16 is in this second position and the inlet 36 is supplied with pressure by the auxiliary circuit 12, the four braking devices of the vehicle are locked.
The means of control 18 include an electronic card 38 which, according to information which it receives from sensors, provides instructions to the motor 20, to the three-wav valve 14 and to the distributor 16. The word "sensor" is to be understood here in its broad sense and is considered as a device sending information to the electronic board 38.
An electrical supply 40 is provided for the correct functioning of the means of control.
A first sensor consists of a box 42 provided with keys enabling the user to key in a code. When a predetermined 7 code is then keyed in, corresponding information is sent to the electronic board 38.
The vehicles are generally provided with a contact with a key 44 and a sensor is provided at this point to inform the board 38 that the electrical circuit of the vehicle has been switched on. Another sensor 46 is provided on a hand brake 48 making it possible to detect whether the hand brake is in an engaged or disengaged position. Another sensor may be incorporated in the electronic board to detect a break in the electrical supply wires.
The operation of the device according to the invention may then be as follows.
When the vehicle is at rest, with the engine switched off, the slide valve of the distributor 16 is in its first position, namely that which connects the inlets 32 to the outlets 34. The braking devices 4 are thus controlled by the master cylinder 8, i.e. it is necessary to exert a pressure on the pedal 6 for braking. When the contact 44 is made, a timer incorporated in the electronic board 38 allows time for a user to key in a code on the key board 42. If the code keyed in corresponds to the recorded code, the slide valve of the distributor 16 remains in its position and the operation of the braking devices 4 is "nor-mall'. During all this time, the three-way valve remains in the position in which it isolates the auxiliary circuit 12 from the rest of the braking circuit.
If now the code keyed in on the keyboard 42 does not correspond to the predetermined code, the electronic board orders the motor 20 to start and orders the actuation of the three-way valve 14 so that this changes from the position in which the auxiliary hydraulic circuit 12 is isolated from the rest of the braking circuit into the position enabling this hydraulic circuit 12 to be connected 8 to the distributer 16. A command is also sent to this distributer 16 so that the braking devices 4 are supplied with hydraulic fluid through the auxiliary circuit 12 from the inlet 36. The brakes are then locked. No action, except for entering the correct code in the box 42, or indeed possible sabotage of the brakes, will enable the wheels 2 to be unlocked. The vehicle is thus immobilized.
For safety reasons, locking of the wheels 2 may also be brought about for example when the electrical contact 44 is not made and the handbrake 48 is released. This situation could arise for example when children are left alone in a vehicle and release the handbrake while playing. If the car is on a slope, the consequences of this play could be very serious.
Locking of the wheels may also be commanded when the sensor incorporated in the electronic board 38 detects a failure in the electricity supply. The independent battery 30 then takes over to ensure the electrical supply of the electronic board 38 and thus enables the braking devices 4 to be locked.
The device could also be provided with other sensors and other schemes could be designed actuating the locking of the braking devices 4.
The differences between the embodiment shown in figure 2 and that in figure 1 are to be found in pa--ticu'ar in the L distributer 16. This distributer is no longer actuated elecricallv but hydraulically. The electronic control board 38 then only sends instructions to the three-way valve 14.
Four inlets 32 and four outlets 34 are to be found on the distributer as on the distributer of figure 1. Instead of a single supplementary inlet 36, there are here two inlets 9 - 1 36a, 36b, one of which for example corresponds to the front wheels and the other to the rear wheels. Another hydraulic inlet 50 is provided. It acts by pressing on the slide valve of the distributer 16 which then behaves as a piston. The latter is prestressed in a rest position by a return spring 52 and when fluid under pressure arrives at the inlet 50, the spring 52 is compressed and the slide valve takes up a position enabling the wheels 2 to be locked without action on the brake pedal 6. A venturi 54 is associated with the inlet 50.
A hydraulic jack 56 is mounted between the three-way valve 14 and the distributer 16. When the three-way valve 14 is connected to the braking circuit, the fluid under pressure coming from the auxiliary hydraulic circuit 12 supplies this hydraulic jack 56. A return spring 58 is provided in the jack 56 so that, when the three-way valve changes from the position enabling connection to be made between the auxiliary hydraulic circuit 12 and the braking circuit in its position isolating the auxiliary hydraulic circuit 12, the inlet of the distributer 50 is no longer under pressure. The wheels 2 may then be unlocked.
In this device, it is thus sufficient to start the motor 20 and hence the pump 22, as well as to actuate the three-way valve so as to put it into a position where it connects the auxiliary circuit 12 and the braking circuit to obtain locking of the wheels 2 by the braking devices.^=. In point of fact, when the pump 22 operates, fluid under pressure is sent by the three-way valve 14 and the hydraulic jack 56, firstly to the inlet 50 and secondly to the inlets 36a and b. The fluid sent to the inlet 50 enables the slide valve of the distributor 16 to move so that the fluid under pressure supplying the inlets 36a and b is sent r-o the braking devices of the wheels 2.
For the rest, an operation will be found which is identical to that described above with reference to figure 1. It is also possible here to have many sensors and to def ine, according to the manufacturer's choice, all situations which could lead to the wheels 2 locking.
For reasons of inviolability, the device according to the invention, including the independent battery 30, may be situated in an armoured box (not shown). This makes it possible to create a deterrent effect against possible thieves.
The systems described may be connected to existing pipelines which end in the braking devices 4. The connection is made at the outlet from the master cylinder of the braking circuit of the vehicle. It is possible to adapt these systems to existing vehicles. If the operation is carried out on a safety device, it must be carried out by a specialist. However, this installation is relatively simple and does not interfere with the operation of the braking system of the vehicle. In the second variant (figure 2), the return spring 58 enables the quantity of brake fluid put into circulation by the device according to the invention to be kept constant. The stroke of the piston of the hydraulic jack 56 has the same value when the system controls the locking of the wheels 2 as when the wheels are once again freed. This principle eliminates any purging or leakage problems.
As will be self evident, the invention is not limited to the two embodiments described above by way of non-limiting examples, but on the other hand it encompasses all the variants within the context of the following claims.
Thus, for example, the motor-pump unit in the auxiliary circuit could be replaced by a jack which would put the hydraulic fluid under pressure. Other solutions may be envisaged for putting this fluid under pressure.
The hydraulic layout of the systems described may be changed. The presence of the three-way valve is not indispensable and/or its position may be modified.
The distributors described are given as examples. Other embodiments may be envisaged. Thus, for example, in the first embodiment, a single inlet coming from the auxiliary circuit is provided on the distributor to supply the four braking devices of a vehicle. In the second variant, two inlets are provided for the four braking devices. It is of course possible to envisage four inlets for four braking devices. It is also possible to imagine a distributor which would only ensure the locking of one or two wheels of the vehicle instead of ensuring the locking of all the wheels.
Finally, the sensors indicated are given by way of nonlimiting examples and many other sensors may be envisaged.
12
Claims (10)
1. Safety and anti-theft device for a vehicle, in particular a motor vehicle, including a hydraulic braking circuit supplying from a master cylinder (8) at least one braking device (4) situated on a wheel (2) of the vehicle, characterized in that it comprises:
- an auxiliary hydraulic circuit (12) having means (20, 22) for putting hydraulic fluid under pressure, - means of selection (16) enabling at least one braking device (4) to be supplied either from the braking circuit or from the auxiliary circuit (12), and - means of control (38) making it possible to act on the means of selection (16).
2. Device according to claim 1, characterized in that the auxiliary hydraulic circuit (12) includes a pump (22), a hydraulic fluid reservoir (24) and a pressure accumulator (28).
3. Device according to claim 2, characterized in that the pump (22) is supplied with power by an independent battery (30).
4. Device according to one of claims 1 to 3, characterized in that the means of selection include a distributor with a slide valve (16) supplied with hydraulic fluid from the master cylinder (8) of the braking circuit and from the auxiliary circuit (12) and distributing the fluid received to at least, one braking device (4) of the vehicle, it being possible for the slide valve to take up a first position in which --he braking devices (4) are supplied from the braking circuit and a second position in which the braking devices (4) are supplied by the auxiliary hydraulic circuit (12).
13
5. Device according to claim 4, characterized in that the means of selection additionally include a three-way valve (14) mounted upstream from the distributor (16) on the auxiliary circuit (12), a valve which in one position isolates the auxiliary hydraulic circuit (12) and which in another position puts the auxiliary hydraulic circuit (12) into connection with the distributor (16).
6. Device according to claim 5, characterized in that the hydraulic fluid under pressure of the auxiliary hydraulic circuit (12) controls the movement of the slide valve.
7. Device according to one of claims 1 to 6, characterized in that the means of control (38) act on the means of selection (14, 16) according to information received by the sensors (42, 44, 46).
8. Device according to claim 7, characterized in that a sensor (46) makes it possible to detect whether a parking brake (48) mounted on the vehicle has been actuated.
9. Device according to one of claims 7 or 8, characterized in that the means of control include a keyboard (42) for entering numerical or alphanumerical data making it possible to key in a confidential code.
10. Device according to claim 9, characterized in that the means of control (38) include a timer started for example by operatinc a lock so as to allow a predetermined period of time to elapse between the action of starting the timer and sending a command to the selection device (16) to act on at least one braking device (4), to allow time for a user to enter the confidential code on the keyboard (42) before putting the safety and anti-theft device into action.
P. DevIce substantially as herein descri-ned.,jiih reference to the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9810682A GB2338762A (en) | 1998-05-19 | 1998-05-19 | Safety and anti-theft device for a vehicle |
| PCT/FR1999/001192 WO1999059849A1 (en) | 1998-05-19 | 1999-05-19 | Security and anti-theft device, in particular for motor vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9810682A GB2338762A (en) | 1998-05-19 | 1998-05-19 | Safety and anti-theft device for a vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9810682D0 GB9810682D0 (en) | 1998-07-15 |
| GB2338762A true GB2338762A (en) | 1999-12-29 |
Family
ID=10832276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9810682A Withdrawn GB2338762A (en) | 1998-05-19 | 1998-05-19 | Safety and anti-theft device for a vehicle |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2338762A (en) |
| WO (1) | WO1999059849A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202000024016A1 (en) * | 2020-10-12 | 2022-04-12 | Vincenzo Dambrosio | "CONDITIONING DEVICE FOR THE HYDRAULIC ACTUATORS OF A VEHICLE, IN ORDER TO PREVENT THEFT" |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4669570A (en) * | 1984-06-01 | 1987-06-02 | Maurice Perret | Anti-theft device for automotive vehicles acting on the hydraulic braking circuit |
| US5505528A (en) * | 1993-01-13 | 1996-04-09 | Mico, Inc. | Electric motorized brake-lock system |
| US5584538A (en) * | 1995-01-13 | 1996-12-17 | Jidosha Kiki Co., Ltd. | Brake system with automatic braking mechanism |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2579944A2 (en) * | 1984-04-05 | 1986-10-10 | Moio Bruno | Anti-theft device for vehicles: by neutralising the electric circuit and instantly locking the brakes after a break-in |
| FR2588812A1 (en) * | 1985-10-18 | 1987-04-24 | Avaac Systems Sa | Vehicle anti-theft device by hydraulic locking of the wheels |
| DE3802015A1 (en) * | 1988-01-25 | 1989-07-27 | Teves Gmbh Alfred | System for securing a vehicle equipped with ABS and/or TCS |
| FR2647071B1 (en) | 1989-05-16 | 1992-04-24 | Dumas Pierre Henri | ANTI-THEFT SYSTEM FOR AUTOMOBILES BY WHEEL LOCK |
| DE4129919C2 (en) * | 1991-09-09 | 2002-05-29 | Bayerische Motoren Werke Ag | Parking brake system for motor vehicles, in particular passenger cars |
| FR2705298B3 (en) * | 1993-05-21 | 1995-09-22 | Le Provost Andre | Anti-theft device for vehicles. |
| FR2714005B1 (en) | 1993-12-16 | 1996-04-12 | Dumas Pierre Henri | Advanced anti-theft system for cars by locking the wheels. |
-
1998
- 1998-05-19 GB GB9810682A patent/GB2338762A/en not_active Withdrawn
-
1999
- 1999-05-19 WO PCT/FR1999/001192 patent/WO1999059849A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4669570A (en) * | 1984-06-01 | 1987-06-02 | Maurice Perret | Anti-theft device for automotive vehicles acting on the hydraulic braking circuit |
| US5505528A (en) * | 1993-01-13 | 1996-04-09 | Mico, Inc. | Electric motorized brake-lock system |
| US5584538A (en) * | 1995-01-13 | 1996-12-17 | Jidosha Kiki Co., Ltd. | Brake system with automatic braking mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202000024016A1 (en) * | 2020-10-12 | 2022-04-12 | Vincenzo Dambrosio | "CONDITIONING DEVICE FOR THE HYDRAULIC ACTUATORS OF A VEHICLE, IN ORDER TO PREVENT THEFT" |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999059849A1 (en) | 1999-11-25 |
| GB9810682D0 (en) | 1998-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |