FR2824351A1 - Control of automobile electric door lock having two drive motors, uses three switching relays to control motor voltage supply - Google Patents

Abstract

The door locking system includes three relays.. The third relay (C3) is switched into an actuating position to interrupt the supply to the second (M2) of the two motors. Then the first and third relays (C1,C3) are switched, at the same time, into a release state so as to return all three relays to a rest state. Control method for a vehicle door lock including a first electric motor (M1) electrically fed via a first relay (C1), with a second motor (M2) fed via the first relay and a third relay (C3). Each relay can be switched between a release state in which it is connected to the vehicles negative supply terminal (-) and an actuated state in which it is connected to the vehicles positive supply terminal (+). From the release state of the three relays, the first (C1) and second (C2) relays are switched at the same time into an actuated state for feeding the second motor (M2). Followed by switching the second relay (C2) into a release state for supply to the first motor (M1) whilst maintaining the first relay in its actuated state and the third relay (C3) in its release state

Description

comprises a housing (12) according to any one of claims

preceding.

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  The invention relates to a control method for a door lock of a motor vehicle comprising a first electric motor electrically powered by a first relay and a second relay, and a second electric motor electrically powered by I ' intermediate of said first relay and of a third relay, each relay being able to be switched between a relaxed state in which it is connected to a negative supply terminal of the vehicle and an actuated state in which it

  is connected to a positive vehicle supply terminal.

  Such a lock can be locked or unlocked, using a remote control, a hands-free access system, or even from a

  electric control button fitted to the vehicle.

  When the lock is locked by switching the relays so as to power the first electric motor, it prevents the opening of the door

  from outside the vehicle. This command is called condemnation.

  When the lock is locked by switching the relays so as to supply the first and the second motor, it prevents the opening of the door from the inside by blocking the frieze zipper of this door, and from the outside of the vehicle . This command is called super-sentencing. These relays can be switched so as to selectively supply each motor while choosing the direction of the supply current. This

  allows you to lock and unlock the lock.

  When the lock is to go from a deadlocking state to a deadlocking state, it is necessary that both motors are actuated. So far, this control is achieved by switching the first relay to an actuated state while maintaining the second and third relays in the released state. It follows that when it switches, the first relay is crossed by a current whose intensity varies from a substantially zero value to a large value which is the sum of the current passing through the first motor and the current passing through the second engine. More specifically, if the first relay is connected to several motors mounted in different vehicle locks, the jump in current flowing through this first relay when it is switched to its actuated state can be worth up to 45 Amps. The second and third relays undergo more limited current jump times

of commutation.

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  As a result, the first relay must be oversized with respect to the second and third relays, since it must be able to switch large currents, without which premature wear leading to the destruction of this relay would take place. The oversizing of this first relay to absorb a large current jump leads to an additional manufacturing cost

  negligible of the lock control system.

  The object of the invention is to remedy this drawback.

  To this end, the invention relates to a control method for a door lock of a motor vehicle comprising a first electric motor electrically powered by a first relay and a second relay, and a second motor. electrically powered by said first relay and a third relay, each relay being able to be switched between a relaxed state in which it is connected to a negative supply terminal of the vehicle and an actuated state in which it is connected to a positive supply terminal of the vehicle, characterized in that it consists, starting from a relaxed state of the three relays, in switching the first relay and the second relay at the same time in an actuated state to supply the second motor, then, to switch the second relay to a relaxed state to supply the first motor while maintaining the first relay in the actuated state and the third relay me

in the relaxed state.

  Thus, to pass from the super-locked state to the unlocked state, the power supply of the first motor and that of the second motor are offset

  to reduce the amplitude of the jumps of current flowing through the first relay.

  In a particular implementation of the method according to the invention, the return to an initial state of the three relays consists in then switching the third relay to an actuated state in order to stop supplying the second motor, then in switching the first and third relay at the same time in a relaxed state to return to an idle state of the three relays. In this way, the return to a relaxed state of the three relays is also achieved

  with a reduced amplitude of current jumps.

  The invention will now be described in more detail, and with reference to the accompanying drawings which illustrate an exemplary embodiment thereof.

not imitative.

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  Figure 1 is a truth table showing control methods of the prior art; FIG. 2 is a representation of the electrical diagram for controlling the lock when the first and second relays are actuated; FIG. 3 is a representation of the electrical diagram for controlling the lock when the first relay is actuated; FIG. 4 is a representation of the electrical diagram for controlling the lock when the first and third relays are actuated; FIG. 5 is a representation of the electrical diagram for controlling the lock when no relay is actuated;

  Figure 6 is a timing diagram illustrating the control process.

  As shown in Figures 1 and 2, the method according to the invention is intended for a locking device making it possible to control one or more locks each comprising two motors M1 and M2 which are supplied electrically by means of three relays C1, C2 , C3. In such a device which is known from the prior art, each first motor M1 is supplied via a first relay C1 and a second relay C2 between which it is mounted. Similarly, each second motor M2 is supplied via the first relay C1 and a third relay C3 between which it is mounted. M1 is a motor, but it is also possible to provide several M1 motors mounted in parallel between the first and the second relay. In the same way, we can also plan

  to mount several M2 motors between the first and the third relay.

  Each relay can be in a relaxed state for which it is connected to a negative (-) terminal of the vehicle, or in an actuated state for which it is connected to a positive (+) supply terminal of the vehicle. Thus, the combinations of the states of these three relays make it possible to selectively supply the first and the second motor and to choose the direction of the current

in each of the engines.

  In Figure 1, there is shown a truth table giving the supply voltages of the relays in the prior art, for several commands. + U corresponds to a relay which is energized to be in an actuated state, and O corresponds to a relay which is not supplied, to be in a released state. Each of the commands shown is carried out in a single phase. The command D -> C allows to pass from a unlocked state D to

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  a condemned state C, and corresponds to energizing the relay C2 for a time t of 500 ms, which makes it possible to electrically supply a first motor M1. Similarly, this table defines the supply voltages for several commands, SC corresponding to a state of superco ndamnation of the r rup. As visible in this table, when a SC -> D command to go from a SC super-locked state to a unlocked D state, relay C1 is energized and relays C 2 and C3 are not powered up. This makes it possible to supply the motors M1 and M 2 for 500 ms. Consequently, in this control of the prior art, the relay C1 switches a current which is equal to the sum of the currents crossing the

  motors M1 and M 2, which requires oversizing of C1.

  In the method according to the invention, the command SC -> D making it possible to power the two motors of each lock takes place in four successive phases corresponding respectively to FIGS. 2, 3, 4 and 5. The phases P1 and P2 are used to supply the motors M 1 and M 2, and phases P 3 and P4 are intended to cut the supply to M 1 and M 2 to return to

an initial state.

  Before the first phase, the three relays are in a relaxed state and the

  first relay is crossed by a current I which is substantially zero.

  In the first phase, the first relay C1 and the second relay C 2 are switched to an actuated state, which makes it possible to supply first only the second motors M 2 through the first relay. During this first phase, the current I passing through the first relay C1 goes from zero to the value of a current i2 which is the current consumed by the second

  motors M 2. Thus, the jump in current I during this first phase is worth 12.

  During a second phase which is shown in FIG. 3, the second relay C 2 is switched to a relaxed state to also supply each first motor M 1 through the first relay. The first relay C1 is kept in the actuated state and the third relay C3 in the released state. During this phase, current I goes from 12 to 11 + 12 but the first relay C1 does not switch, 11 designating the current

  that the first M1 engines call. The variation of current I is worth 11 here.

  To return to the initial state, it will be possible to provide in the command the third and the fourth phase below which make it possible to cut the power supply to the motors while also limiting the jump in current I

crossing the first relay.

  In a third phase, the third relay (C3) is switched to an actuated state, which makes it possible to cut off the supply to each second motor M2 so that only the first motors are supplied through the first relay. The current I then passes from 11 + 12 to 11, so that its variation is worth 12. During a fourth phase which is represented in figure 5, the first and the third relay are released at the same time, which makes it possible to cut the supply of each first motor M1 and return to a relaxed state of the three relays. As we can see, the variation of the current I

  during this fourth phase is worth 11.

  As shown in Figure 6, it is only during the second phase P2 that the two motors M1 and M2 are supplied. In this way, if the first and third phases P1, P3 have the same duration, the motors are supplied for the same duration for the entire command which extends between the start of the first phase P1 and the start of the fourth phase P4. And this, without the first relay having to switch the current of the two motors 11 + 12 at the same time. More specifically, if the first and third phases last 50 ms each and if the second phase lasts 450 ms, each motor is powered for

  500 ms for the entire command operation.

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Claims (2)

  1 / Control method for a motor vehicle door lock comprising a first electric motor (M1) electrically supplied by means of a first relay (C1) and a second relay (C2), and a second motor electric (M2) supplied electrically via said first relay (C1) and a third relay (C3), each relay being able to be switched between a relaxed state in which it is connected to a negative supply terminal (-) of the vehicle and an actuated state in which it is connected to a positive supply terminal (+) of the vehicle, characterized in that it consists, starting from a relaxed state of the three relays, in switching the first relay (C1 ) and the second relay (C2) at the same time in an actuated state to supply the second motor (M2), then then, to switch the second relay (C2) in a released state to supply the first motor (M1) while maintaining the first relay (C1) in the state   actuated and the third relay (C3) in the released state.   2 / A control method according to claim 1, characterized in that it then consists in switching the third relay (C3) in an actuated state to stop supplying the second motor (M2), then in switching the first and third relay (C1, C3) at the same time in a relaxed state for