Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Reexamination Certificate
1995-05-11
2001-12-04
Lieu, Julie (Department: 2632)
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
C340S539230, C340S531000, C340S534000, C340S870030, C340S870030, C307S010200, C455S098000
Reexamination Certificate
active
06326885
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a keyless security system and, more particularly, to a keyless security system equipped with a portable transmitter and a vehicle-mounted receiver which receives a remote control signal supplied from the portable transmitter so as to lock or unlock a vehicular door lock mechanism and which also monitors each section of the vehicle when not in use and issues an alarm if any anomalies are detected.
2. Description of the Related Art
A conventional keyless security system is constructed by a portable transmitter and a vehicle-mounted receiver. When the vehicle is not in use, the vehicle-mounted receiver monitors for the motion of the vehicle, a shock applied to the vehicle, an opened door, a broken window, and other anomalies. The vehicle-mounted receiver serves as a vehicular security system for sounding an alarm if it detects such an anomaly and it also serves as a vehicular key to lock and unlock a vehicular door in response to the remote control signal received from the portable transmitter.
FIGS. 7A and 7B
are schematic diagrams showing an outline of the construction of the aforesaid known keyless security system;
FIG. 7A
shows the construction of the portable transmitter and
FIG. 7B
shows the construction of the vehicle-mounted receiver.
The system illustrated in
FIGS. 7A and 7B
includes a portable transmitter
50
, a button control panel
51
, an unlock button (disarm button)
51
-
1
, a lock button (arm button)
51
-
2
, a remote control processing unit
52
, a transmitting unit
53
, a transmitting antenna
54
, a vehicle-mounted receiver
60
, a receiving antenna
61
, a receiving module
62
, a control unit
63
, a power switch
64
, a line voltage regulator
65
, a door lock device
71
, a door sensor
72
, a motion sensor
73
, a shock sensor
74
, a glass sensor
75
, a siren driver circuit
76
, and a headlight blinker circuit
77
.
The portable transmitter
50
includes the button control panel
51
which has the lock button
51
-
1
and the unlock button
51
-
2
for setting the lock/unlock condition of the vehicular door lock mechanism, the remote control processing unit
52
for issuing data signals corresponding to the aforesaid buttons
51
-
1
and
51
-
2
, respectively, the transmitting unit
53
for converting the aforesaid data signals into remote control signals, and the transmitting antenna
54
for transmitting the remote control signals. The vehicle-mounted receiver
60
includes the receiving antenna
61
for receiving the remote control signals, a receiving module
62
which receives the remote control signals and supplies an electric field intensity detection signal SQ based on the remote control signals and the aforesaid data signal to the control unit
63
, the control unit
63
which monitors each section of the vehicle and issues an alarm if any anomaly is detected, and also controls the locking and unlocking of the vehicular lock mechanism in response to the aforesaid data signal, the power switch
64
which turns ON/OFF the power to the receiving module
62
, and the voltage regulator
65
which regulates the line voltage.
In connection with the construction stated above, the function for the vehicular security will be first described first. When the vehicle is not in use, if the vehicle-mounted receiver
60
is set in a security mode, then the control unit
63
is alternately switched in a fixed cycle between a control-activated condition, under which each section is monitored at high speed, and a standby condition, under which no monitoring control is carried out in the subsystem clock mode, so as to minimize the power consumed by the vehicle-mounted receiver
60
. During the control-activated condition, the control unit
63
monitors for an opened door through the door sensor
72
, vehicle motion through the motion sensor
73
, a shock applied to the vehicle through the shock sensor
74
, and a broken window through the glass sensor
75
. If any of the anomalies is detected, the control unit
63
actuates the siren driver circuit
76
to give an audible alarm such as siren and/or actuates the headlight blinker circuit
77
to flash the headlight. The control unit
63
issues such an audible alarm to signal the anomaly of the vehicle; it issues no alarm if none of the aforesaid anomalies are detected.
The operation for locking and unlocking the vehicular door will now be described. Under the control-activated condition, the control unit
63
monitors for anomalies and also supplies control signal V
TCONT
to the power switch
64
. While control signal V
TCONT
is being supplied, the power switch
64
functions to supply the line voltage obtained through the line voltage regulator
65
to the receiving module
62
so as to set the receiving module
62
ready for receiving the remote control signal. While the receiving module
62
is ready for receiving the remote control signal, if the lock button
51
-
1
or the unlock button
52
-
2
of the button control panel
51
of the portable transmitter
50
is operated, then the data signal, which corresponds to the button operation, is generated in the remote control processing unit
52
. The data signal thus generated is converted into the remote control signal through the transmitting unit
53
before it is transmitted through the transmitting antenna
54
. When the receiving module
62
of the vehicle-mounted receiver
60
receives the transmitted remote control signal through the receiving antenna
61
, the receiving module
62
, which is ready for receiving the remote control signal, processes the received remote control signal and supplies electric field detection signal SQ (representing electric field of the remote control signal and demodulated data signal DATA) to the control unit
63
. Upon receipt of electric field detection signal SQ, the control unit
63
switches the periodic control-activated condition over to the continuous control-activated condition. At the same time, the control unit supplies continuous control signal V
TCONT
to the power switch
64
and it also sets the receiving module
62
for receiving continuous remote control signals. Thus, the receiving module
62
becomes ready to receive the remote control signals which are supplied in succession. The control unit
63
drives the door lock device
71
in accordance with the contents of data signal DATA supplied from the receiving module
62
, thereby locking or unlocking the vehicular door key.
FIG. 8
is the block diagram showing the details of the configuration of the receiving module
62
in the known keyless security system illustrated in FIG.
7
B.
The receiving module
62
shown in
FIG. 8
includes a signal receiver
80
, a high-frequency band-pass filter
81
, a high-frequency amplifier
82
, a frequency mixer circuit
83
, a local oscillator
84
, an intermediate-frequency (IF) band-pass filter
85
, an IF amplifier
86
, a demodulating unit
87
, a signal processor
90
, a low-pass filter
91
, a comparator circuit
92
, an electric field detector
95
, a band-pass filter
96
, an electric field intensity detector
97
, and a comparator circuit
98
. Other composing elements which are identical to those shown in
FIG. 7B
are assigned the same reference numerals.
The signal receiver
80
includes the high-frequency band-pass filter
81
for removing the frequency components to isolate the effective frequency component from a received remote control signal, the high-frequency amplifier
82
for amplifying the filtered remote control signal as necessary, the local oscillator
83
for generating a local oscillation frequency signal, the frequency mixer circuit
84
for mixing the remote control signal with the local oscillation frequency signal and for generating an IF signal, the IF band-pass filter
85
for removing unnecessary frequency components from the IF signal, the filtered IF amplifier
86
for amplifying the IF signal as necessary, and the demodulating unit
87
for demodulating the filtered IF signal to obta
Alpine Electronics Inc.
Brinks Hofer Gilson & Lione
Lieu Julie
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