Vehicle security system upgrade
First Claim
1. A security system upgrade kit for a vehicle including a door lock switch connected to provide electrical lock and unlock signals, a two-step door lock mechanism connected so as to sequentially unlock one door of the vehicle in response to a first unlock signal from the door lock switch, and then unlock a second door of the vehicle in response to a subsequent unlock signal from the door lock switch, a central control switch connected to said two-step door lock mechanism so as to provide signals to simultaneously unlock said first and second doors and an ignition switch, and to disarm a vehicle alarm, said upgrade kit comprising:
- an alarm circuit having a disarm input and adapted to be connected to said vehicle alarm; and
a disarm control circuit adapted to be connected to the two-step door lock mechanism and to said disarm input of said alarm circuit so as to disarm said alarm circuit in response to activation of said two-step door lock mechanism upon which said doors are unlocked sequentially and further including inhibiting circuitry connected to said control switch to prevent said alarm circuit from disarming the vehicle alarm in response to activation of said central control switch upon which said first and second doors are unlocked simultaneously.
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Accused Products
Abstract
An upgrade method and apparatus for both remote and key-operated two-step vehicle security systems is disclosed. The upgrade blocks attempts to disarm the alarm circuit when the vehicle is armed and unlocked improperly.
The upgrade can be added to existing systems regardless of the polarity of the signals used therein. Improved power-up and remote control features can also be added as a part of the upgrade.
54 Citations
34 Claims
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1. A security system upgrade kit for a vehicle including a door lock switch connected to provide electrical lock and unlock signals, a two-step door lock mechanism connected so as to sequentially unlock one door of the vehicle in response to a first unlock signal from the door lock switch, and then unlock a second door of the vehicle in response to a subsequent unlock signal from the door lock switch, a central control switch connected to said two-step door lock mechanism so as to provide signals to simultaneously unlock said first and second doors and an ignition switch, and to disarm a vehicle alarm, said upgrade kit comprising:
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an alarm circuit having a disarm input and adapted to be connected to said vehicle alarm; and a disarm control circuit adapted to be connected to the two-step door lock mechanism and to said disarm input of said alarm circuit so as to disarm said alarm circuit in response to activation of said two-step door lock mechanism upon which said doors are unlocked sequentially and further including inhibiting circuitry connected to said control switch to prevent said alarm circuit from disarming the vehicle alarm in response to activation of said central control switch upon which said first and second doors are unlocked simultaneously. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A vehicle security system, comprising:
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a door lock switch connected to provide electrical lock and unlock signals; a two-step door lock mechanism connected so as to sequentially unlock one door of the vehicle in response to a first unlock signal from the door lock switch, and then unlock a second door of the vehicle in response to a subsequent unlock signal from the door lock switch; a central control switch connected to said two-step door lock mechanism so as to provide signals to simultaneously unlock said first and second doors; a disarm control circuit connected to said two-step door lock mechanism so as to disable said disarm control circuit in response to activation of said central control switch upon which said doors are unlocked simultaneously rather than sequentially, so as to prevent said disarm control circuit from producing a disarm signal when said central control switch is activated; an alarm circuit connected to said disarm control circuit so as to be disarmed in response to a disarm signal from said disarm control circuit; a door lock control circuit having a first output connected to provide the first door unlock control signal when the first door is unlocked; a second output connected to provide the second door unlock control signal when another door is unlocked, and first and second inputs connected to the door lock switch and the central control switch so as to provide said first and second outputs in response to the unlocking of the first door and the unlocking of another door, respectively;
whereinsaid first and second unlock signals on respective first and second inputs produce respective first and second unlock signals on respective outputs. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A method of upgrading a vehicle security system, said security system having a two-step door lock mechanism connected so as to sequentially unlock one door of the vehicle in response to a first unlock signal from the door lock switch, and then unlock a second door of the vehicle in response to a subsequent unlock signal from the door lock switch, a central control switch connected to said two-step door lock mechanism so as to provide signals to simultaneously unlock said first and second doors and an ignition switch and to disarm a vehicle alarm, said method comprising the steps of:
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connecting one input of a disarm control circuit to receive the unlock-first-door signal; connecting another input of the disarm control circuit to receive the unlock-second-door signal; and connecting an output of the disarm control circuit to the disarm input of an alarm circuit of the vehicle alarm, said output providing a signal so as to disarm said alarm circuit in response to activation of said two-step door lock mechanism upon which said doors are unlocked sequentially and further connecting said central control switch to inhibiting circuitry to prevent said alarm circuit from disarming the vehicle alarm in response to activation of said central control switch upon which said first and second doors are unlocked simultaneously. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. A method of upgrading a vehicle security system including a door lock control circuit having first- and second-door-unlock control signal outputs and an alarm control circuit, said alarm control circuit having a disarm input, said method providing improved vehicle security, said method comprising the steps of:
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disconnecting the disarm input of the alarm control circuit from any connections external to the alarm control circuit; connecting a first of two inputs of an EXCLUSIVE OR gate to the first-door-unlock control signal output; connecting a second of said two inputs of said EXCLUSIVE OR gate to the second-door-unlock control signal output; and connecting the disarm input of the alarm control circuit to an output of said EXCLUSIVE OR gate so that said alarm control circuit is disarmed when one but not two signals are provided to said two inputs of the EXCLUSIVE OR gate.
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Specification