WO1999037510A1

WO1999037510A1 - Vehicle security system

Info

Publication number: WO1999037510A1
Application number: PCT/US1999/001262
Authority: WO
Inventors: Joaquim Da Silva Augusto; Ettienne Cox; Manuel Da Costa Reis
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-01-22
Filing date: 1999-01-21
Publication date: 1999-07-29
Anticipated expiration: 2000-07-22
Also published as: ZA98540B; AU2240099A

Abstract

A vehicle security system is provided which includes a base unit (12) and a portable remote device (10). The base unit (12) is located in a vehicle and includes base transmitter means (24) operable to transmit at least one status signal. The portable remote device (10) includes remote receiver means (106) operable to receive the status signal, and further includes warning means (56, 58) responsive to the remote receiver means (106) and operable to generate a warning signal when communication between the base unit (12) and the portable remote device (10) is at least impeded. Preferably, the remote device (10) and base unit (12) include a remote transceiver and a base transceiver respectively to permit bi-directional communication. The invention extends to a method of monitoring unauthorized tampering with a vehicle and to a portable remote device (10) for use in the system.

Description

VEHICLE SECURITY SYSTEM

THIS INVENTION relates to a vehicle security system. It also relates to a portable remote device for use in the system and to a method of monitoring unauthorised tampering with a vehicle.

According to the invention, there is provided a vehicle security system, which includes a base unit located in a vehicle in use and which includes base transmitter means operable to transmit at least one status signal; and a portable remote device which includes remote receiver means operable to receive the status signal, the portable remote device including warning means responsive to the receiver means and operable to generate a warning signal when communication between the base unit and the portable remote device is at least impeded.

The base unit may include a base transceiver including the base transmitter means and including base receiver means; and the portable remote device may include a remote transceiver including the remote receiver means and including remote transmitter means thereby to permit bi-directional communication between the base unit and the portable remote device.

The warning means may include a visual indicator, e.g. an LED, which at least intermittently provides a visual indication when communication between the base unit and the portable remote device is at least impeded. 2

Additionally or instead, the warning means may include an audible warning device, e.g. a buzzer or the like, which at least intermittently provides an audible indication when communication between the base unit and portable remote device is at least impeded, typically when a total communication breakdown occurs between the remote device and the base unit.

Preferably, the portable remote device includes switching means, e.g. a push-button or the like, for selectively disabling the warning means.

The base unit may include sensing means for sensing unauthorised tampering, e.g. unauthorised access, with the vehicle. The base transmitter means may be operable in response to transmit a coded alarm condition via the status signal to the warning means of the portable remote device.

The base transceiver and the remote transceiver may each include an encoder and a decoder thereby to permit coding of the status signal.

The base unit may include disabling means for disabling the vehicle. The disabling means may be responsive to the base receiver means, and the portable remote device may include a switch for activating the portable remote device to transmit a coded disable condition to the base receiver means thereby selectively to permit remote disabling of the vehicle.

Typically, the disabling means includes at least one relay, preferably four relays, connected in use to an electrical system of the vehicle in such a fashion so as to selectively disable the vehicle.

The portable remote device and the base unit may each include a microprocessor based controller operable at least to control coded communication between the portable remote device and the base unit. 3

Preferably, the base transceiver and the remote transceiver are frequency modulated transceivers, e.g. conventional FM transceivers.

Further in accordance with the invention, there is provided a method of monitoring unauthorised tampering with a vehicle by means of a vehicle security system including a base unit and a portable remote device which is operable to receive a transmitted signal from the base unit, the method including at least intermittently monitoring reception of the transmitted signal by the portable remote device; generating a warning when reception of the transmitted signal is at least partially impeded; and sensing when unauthorised tampering with the vehicle is sensed and in response thereto generating an alarm.

The method may include coding the transmitted signal to include information on the status of the vehicle.

The base unit and the portable remote device may be operable to communicate in a bi-directional fashion, the method including selectively transmitting a coded disable signal from the portable remote device to the base unit thereby remotely to disable the vehicle.

The base unit may transmit a coded confirmation signal to the remote unit to confirm receipt of the coded disable signal.

The portable remote device may transmit a coded confirmation signal to the base unit to confirm receipt of the transmitted signal.

Still further in accordance with the invention, there is provided a portable remote device for use in a vehicle security system, the device including a compact portable housing; 4 receiver means mounted within the housing and operable to receive a status signal from a base station mounted in a vehicle; and monitoring means responsive to the receiver means and operable to generate a warning when communication between the base station and the portable remote device is at least impeded.

The portable remote device may include decoding means operable to decode an encoded status signal which includes an alarm code when tampering with the vehicle is sensed by the base unit.

The portable remote device may include a remote transceiver including the receiver means thereby to permit bi-directional communication between the portable remote device and the base station.

The invention is now described, by way of example, with reference to the accompanying diagrammatic drawings.

In the drawings, Figure 1 shows a schematic diagram of a portable remote device of a vehicle security system in accordance with the invention;

Figure 2 shows a schematic circuit diagram of a remote controller of the remote device of Figure 1 ;

Figure 3 shows a schematic circuit diagram of a power supply unit of the remote device of Figure 1 ;

Figure 4 shows a schematic circuit diagram of a decoder of the remote device of Figure 1 ;

Figure 5 shows a schematic circuit diagram of an encoder of the remote device of Figure 1 ; Figure 6 shows a schematic diagram of a remote transceiver of the remote device of Figure 1 ;

Figure 7 shows a circuit diagram of a base unit of the vehicle security system; 5

Figure 8 shows a schematic circuit diagram of a base controller of the base unit of Figure 7;

Figure 9 shows a schematic circuit diagram of relay units of the base unit of Figure 7; Figure 10 shows a schematic circuit diagram of a power supply unit of the base unit of Figure 7;

Figure 1 1 shows a schematic circuit diagram of a decoder of the base unit of Figure 7;

Figure 1 2 shows a schematic circuit diagram of an encoder of the base unit of Figure 7; and

Figure 1 3 shows a schematic circuit diagram of a base transceiver of the base unit of Figure 7.

Referring to the drawings, a vehicle security system, in accordance with the invention, includes a portable remote device 1 0 which is in bi-directional radio frequency communication with a base unit 1 2 (see Figure 7) of the security system. The base unit 12 is connected to a conventional vehicle alarm system mounted in a vehicle and is operable to transmit a coded status signal to the portable remote device 1 0 when unauthorised tampering with the vehicle is sensed. When the portable remote device 10 is out of range of the base unit 1 2, thereby impeding or preventing radio frequency communication between the base unit 1 2 and the portable remote device 1 0, the portable remote device 10 is operable to provide a warning to a bearer, as described in more detail below.

The portable remote device 10 includes a remote controller 14 connected via lines 1 6 to an encoder 1 8 and via lines 20 to a decoder 22. The remote device 10 further includes a remote transceiver 24 which has its transmitter data line 26 connected to the encoder 1 8, its transmitter select line 28 connected to the remote controller 14, its receiver data line 30 connected to the decoder 22, and its receiver select line 32 connected to the remote controller 14. The remote device 10 further includes a power supply unit 34 (see Figure 3) for supplying regulated power to its various components. 6

The remote controller 14 (see Figure 2) includes a PIC16F84 microcontroller chip 36 and associated circuitry. The firmware used in the portable remote device 10 is provided in Table 1 at the end of the specification. The microcontroller chip 36 has certain of its ports connected via lines 1 6, 32, and 20 to the encoder 1 8, the remote transceiver 24, and the decoder 22 respectively. The microcontroller chip 36 has one of its ports connected via a resistor 38 to a switching transistor 40 which is connected via a terminal block 42 to a buzzer for selectively providing an audible warning. The microcontroller chip 36 has certain of its ports connected via lines 20, 28 to the decoder 22 and to the transceiver 24 respectively. Further ports of the microcontroller chip 36 are connected via lines 44, 46, 48, 50 to a first switch 52, a second switch 54, a first LED 56, and a second LED 58 respectively.

Referring in particular to Figure 3 of the drawings, the power supply unit 34 is connected via a connector 60 to an external power source or via a further connector 62 to a rechargeable battery power source. The power supply unit 34 includes a protection diode 64 and a zener diode 66, and a 1 2 volt power output is provided at terminal 68. The 1 2 volt output is also fed into a voltage regulator 70, with its associated circuitry, and a 5 volt regulated output is provided on terminal 72 for the various components of the remote device 1 0.

The decoder 22 (see Figures 1 and 4) includes a PIC1 6C56 microcontroller chip 74 and associated circuitry. Certain of the ports of the microcontroller chip 74 are connected via lines 20 to the microcontroller chip 36 as hereinbefore described. The microcontroller chip 74 is connected via lines 76 to a clock chip 78 and via line 80 to a DS 1 810 chip 82. Data from the transceiver 24 is fed into the decoder 22 via the receiver data line 30.

The encoder 1 8 (see Figures 1 and 5) is connected to the transceiver 24 via the transmitter data line 26 as hereinbefore described. The encoder is formed by an HCS 200 encoder chip 84 which is connected to the microcontroller 7 chip 36 via lines 1 6. Test points 86 are optionally provided for trouble shooting purposes.

Referring in particular to Figure 6 of the drawings, the transceiver 24 includes an FM transmitter 88 and a corresponding FM receiver 90. The transmitter 88 is connected to an antenna via terminals 92 and, likewise, the receiver 90 is connected to an antenna via terminals 94. The transmitter 88 is connected to a transistor 96 which, in turn, is connected to the microcontroller chip 36 via the transmitter select line 28. Further, the transmitter 88 is connected via the transmitter data line 26 to the encoder 84 (see Figures 5 and 6) . The receiver 90 is also connected to a transistor 98 which, in turn, is connected via the receiver select line 32 to the microcontroller chip 36. A data output port of the FM receiver 90 is connected via the receiver data line 30 to the decoder 22 as described above.

Referring in particular to Figures 7 to 1 3 of the drawings, the base unit 1 2 includes a controller 1 00 connected to an encoder 102, a decoder 104, and a transceiver 106. The interconnection of the controller 100 and the encoder 102, decoder 1 04 and transceiver 106 resembles the interconnection of the various components of the portable remote device 1 0 (see Figure 1 ) and, accordingly, like reference numerals have been used to indicate the same or similar features.

The controller 100 is connected via lines 1 6 to the encoder 102 which, in turn, is connected via a transmitter data line 26 to the transceiver 106. Further, the controller 1 00 is connected via lines 20 to the decoder 104 which is connected via a receiver data line 30 to the transceiver 1 06. The receiver data line 30 is also connected via a diode 108 to a main connector 1 10 which interfaces the base unit 1 2 to various circuitry of the motor vehicle as well as a conventional ultrasonic vehicle alarm system. A power supply unit 1 1 2 supplies power to various components of the base unit 1 2. 8

Unlike the portable remote device 1 0, the base unit 1 2 includes a relay arrangement 1 1 4 which is connected via lines 1 1 6 to the controller 100. The main connector 1 10 connects the base unit 1 2 via line 1 1 8 to a 1 2 volt power source, and via line 1 20 connects the controller 100 to the ignition of the vehicle. Output line 1 22 connects the controller 100 via the main connector 1 10 to an LED which is mounted in the vehicle to provide a visual indication in the status of the vehicle security system. The controller 100 is connected via line 1 24 to a door sensor, and via line 1 26 to an alarm input connector of the main connector 1 1 0. The alarm input is derived from the conventional vehicle alarm system provided in the vehicle. The controller 100 is connected via line 128 and via the connector 1 10 to an audio alarm e.g. a buzzer in the vehicle, and via line 1 30 to the decoder 104. The transceiver 106 is connected via a transmitter select line 28 to the controller 100.

The controller 100 includes a PIC1 6C73 microcontroller chip 132 which is connected via lines 1 1 6 to the relay arrangement 1 14 as described above, and via lines 20 to the decoder 104. The firmware used in the base unit 1 2 is provided in Table 2 at the end of the specification.

The ignition line 1 20 is connected via a diode 1 34 and a voltage clamping circuit 1 36 to an input port 1 38 of the microcontroller chip 1 32. Further output ports are connected via lines 1 6 to the encoder 102 as described above and a further output port 1 40 is connected via line 142 and via a diode 144 to the line 1 24 which leads to the door sensor via the main connector 1 10. Output line 1 22 is connected to a switching transistor 1 46 which, in turn, is selectively switched by the microcontroller chip 1 32 via line 148. In a similar fashion, the output line 1 28, which activates the buzzer, is connected to a switching transistor 150 which is selectively switched by the microcontroller chip 1 32 via line 1 52. The alarm output line 1 26 is connected to a further port of the microcontroller chip 1 32 via line 1 54. The microcontroller chip 1 32 has one of its ports connected via a reset line 20.1 to the decoder 104. The microcontroller chip 1 32 is also connected via a detect line 1 56 (see Figures 7 and 8) to the transceiver 9

1 06 and via line 1 30 to the decoder 1 04 as described above, and via the receiver select line 32 and transmitter select line 28 to the transceiver 106.

The relay arrangement 1 1 4 (see Figures 7 and 9) comprises four identical relay sub-circuits 1 58 each of which includes a switching transistor 160 which is arranged selectively to switch a relay 1 62. Each relay sub-circuit 1 58 is powered from a 1 2 volt output terminal 1 64 (see Figure 10) of the power supply unit 1 1 2. Lines 1 1 6 (see Figures 7 and 9) connect the respective switching transistors 1 60 of the relay arrangement 1 14 to selected ports of the microcontroller chip 1 32 (see Figure 8) . Lines 166, 168, 170 and 172 connect the relays 1 62 to the main connector 1 1 0 (see Figure 7 and 9) .

The power supply unit 1 1 2 has its terminal 1 74 connected via line 1 76 (see Figures 7 and 10) to a 1 2 volt input contact of the main connector 1 10. Power is fed via a fuse 1 78 to the 1 2 volt output terminal 1 64 and to a 5 volt voltage regulator 1 80 which, together with its associated circuitry, provides a 5 volt regulated output on terminal 1 82 which is fed to the various components of the base unit 1 2.

The encoder 1 02 is substantially similar to the encoder 1 8 (see Figure 5) and, likewise, the decoder 1 04 is substantially similar to the decoder 22 of the portable remote device 1 0. Accordingly, like reference numerals have been used to indicate the same or similar features unless otherwise indicated.

The encoder 102 includes an HCS 200 encoder chip 84 which is connected via lines 1 6 to the microcontroller chip 1 32 as described above. The transmitter data line 26 is connected to a data in port of an FM transmitter 1 84 (see Figure 1 3) of the transceiver 106.

The decoder 1 04 includes a PIC1 6C56 microcontroller chip 74 connected to a clock chip 78 via lines 76 and to a DS 1 81 0 chip 82 via line 80. Selected ports of the microcontroller chip 74 are connected via lines 20 to the 10 microcontroller chip 1 32 (see Figures 8 and 1 1 ) . A selected output port of the microcontroller chip 74 is connected via line 1 86 to a transistor 1 88. The transistor 1 88 has its base connected to the receiver data line 30, which, in turn, is connected to a FM receiver 1 90 of the transceiver 106 via a transistor 1 92 (see Figure 1 3). The FM receiver 1 90 is connected via transistors 1 94, 1 96 and via line 1 56 and the receiver select line 32 respectively to the microcontroller chip 1 32 (see Figures 7, 8 and 1 3) . Likewise, the FM transmitter 1 84 is connected via a transistor 1 98 and via the transmitter select line 28 to a port of the microcontroller chip 1 32 (see Figures 8 and 1 3).

The base unit 1 2 is connected via an appropriate terminal on its main connector 1 10 to the conventional alarm system which monitors tampering, e.g. unauthorised access to the vehicle. Such a system may, for example, monitor door contact switches of the vehicle, include an ultrasonic motion detector, monitor opening of the hood of the vehicle, or the like when unauthorised tampering to the vehicle is sensed. The vehicle security system is armed automatically about 30 seconds after the ignition switch of the vehicle is switched off and once a door of the vehicle has been opened and closed. Relay contacts of the relay arrangement 1 1 4, which are connected to various cut-out circuits of the vehicle via the main connector 1 10, are released and selected circuits of the vehicle such as the vehicles ignition, fuel supply and coil control are thereby disabled. The display LED connected to the base unit 1 2 via line 1 22 (see Figure 7) is then intermittently illuminated to indicate that the vehicle security system has been armed. The base unit 1 2 then begins to transmit an immobilised code approximately every 1 0 seconds to the portable remote device 10.

The portable remote device 1 0, when switched on, receives the immobilised code from the base unit 1 2 acknowledges receipt of the immobilised code to the base unit 1 2. The first LED 56 (see Figure 2) of the remote device 10 is then energised to indicate that the vehicle security system is active and that the vehicle has been immobilised. The immobilised code, which is transmitted from the base unit 1 2 to the portable remote device 1 0 every ten seconds, is 1 1 monitored by the portable remote device 1 0. If the bearer of the remote device 10 moves out of range of the base unit 10, typically about 500m, and radio frequency bi-directional communication is at least impeded or terminated, the buzzer connected to terminal block 42 (see Figure 2) is activated and the first LED 56 is intermittently flashed to indicate to the bearer that the portable remote device 1 0 is out of range of the base unit 1 2. This warning is repeated approximately every 20 seconds until the portable remote unit 1 0 is back within range of the base unit 1 2. However, in the event of the bearer of the portable remote device 1 0 being out of range for a prolonged period, the warning signal may be deactivated until the portable remote device 1 0 is switched on again and reactivated.

If unauthorised tampering with the vehicle is sensed by the base unit 1 2, an alarm code is then transmitted to the portable remote device 10 to indicate the vehicle status. On detecting the alarm code, the remote device 10 activates the buzzer and flashes the second LED 58 whilst the first LED 56 remains on. The buzzer may be deactivated by pressing the second switch 54 momentarily. Thus, the bearer of the portable remote device 10 is notified of the unauthorised tampering with the vehicle.

When the alarm code is received by the remote device 10, various defence circuits connected to the relay arrangement 1 1 4 may be activated by pressing the second switch 54 and holding it down for more than 5 seconds. The remote device 1 0 then transmits a defence activation code to the base unit 1 2 and energises the relays 1 62 thereby to immobilise the vehicle. In order to confirm or acknowledge that the vehicle has been immobilised, the base unit 1 2. transmits a defence activated code to the remote device 1 0 which, in turn, causes the first LED 56 to flash intermittently and the second LED 58 to flash intermittently at a greater frequency to indicate that the various defence circuits have been activated. 1 2

The defence circuits collectively switched by the relay arrangement 1 14 may be deactivated by pressing the second switch 54 for a duration of less than 5 seconds. The remote device 1 0 then transmits a deactivation signal to the base unit 1 2 and the relays 1 62 are energised to enable the vehicle and a confirmation signal is sent from the base unit 1 2 to the remote device 10 once this has been effected. The first and second LED 56 and 58 then revert to their original conditions.

In order to disable the vehicle security system, the bearer of the ^' remote device 10 presses the first switch 52 which causes the remote device 10 to transmit a disarm code to the base unit 1 2 which, in turn, deactivates and disables the immobiliser circuitry. The first LED 56 is then switched off and a confirmation code is transmitted from the base station 1 2 to the remote device 1 0 to confirm that the vehicle security system has been deactivated. The driver of the vehicle must then start the vehicle within 30 seconds failing which the vehicle security system will once again be activated automatically.

The Applicant believes that the invention, as illustrated, provides a relatively simple vehicle security system which allows a bearer of the portable remote device 10 to constantly monitor whether or not the vehicle is being tampered with. The Applicant further believes that it is an advantage of the invention, as illustrated, that the bearer of the portable remote device 10 is warned when it is out of range of the base unit 12.

13

TABLE 1

;" Filename MAN cτ. c

Program ,-escrι.p-ιoπ

; Dace Author Rev Detail

; 17 Oct 1997 Z . Cox 1.0

Data

Sword led_count Sword buzzer_count Sword tx_count Sword range_couπt Sword sw_count

Sbyte countl

Sbyte rx_code ; code received Sbyte rx_codel ; emp code received

Sbyte sw_statusl ;lst switch status Sbyte sw_status2 ; 2nd switch status

Sbyte raan_status .^•present status of man unit

; flags

Sbit απ_flag Sbit bιt_set_flag Sbit code_rκ_filag Sbit ala*ππ_flag Sbit defence_flag

;bytes for PROCs Sbyte byte_ π Sbyce byte out

Literals

; INPUTS sdefine S'rfl PORTB:0 ;Swιtchl Sdefine SW2 PORTB .1 ; Swιtch2 Sdefme RX_S0 PORTB. ; received code SO Sdefine RX_S1 PORTB: 5 ; eceived code SI Sdefine RX S2 PORTB: 6 ; eceived cede S2

;OUTPUTS :

Sdefme 3UZZER PORTA.O ;buzzer line

Sdefine TX SO PORTA: 1 ; transmit code SO

Sdefine TX SI PORTA.2 -transmit code SI sdefme TX S2 PORTA.3 ; transmit code S2

Sdefine RX SEL PORTA.4 ; eceiver select

Sdefme ^•-.ε:.u PORTB.2 , LED1 output

Sdefir.e SD2 PORT3.3 ;LΞD2 output

Sdefir.e TX SEL PORTB.7 , transmiter seiec;

Constants

Sde fir.e ARMED Sdefine D - SARr-ΕD <Jde f i-e ALARM •fd-.£ιne 3εr≤NCΞ l Sce fi-.e DE FENCE 2 14

Sdefine OUT_RANGE 50

Sdefine ALAKM1 51 ϊ afj-πe ALARM2 52

Sdefine ON 1

Sdefine OFF 0 register b ts Literals

CODE

INTERRUPT HANDLER

INT_haπdler nop endint

Main entry point for this program mam: clear_wdt clear WATCHDOG timer call Initialise ; setup the environment

IOOD

; check timer call TIME

; heck RX call CHECK_RX

; heck switches call CHΞCK_SW

; heck status if man_status - DISARMED then raπge_count - 0 L-.D1 - OF? LED2 - OFF else

; check range if range_count > 1500 then ; 3x update rate raπge_count - 0 buzzer_count — 0 BUZZER - ON man_status - OUT RANGE endif if man_status - ARMED then LED1 - ON LED2 - OFF else if man_status - OUT_RANGE then LED1 - ON ; Flash LED if led_count > 55 Chen set LED2 if led_count > SO then clear LED2 led_cαunt -^*■ 0 endif endif else if man_status ^■» ALA?JH1 tnen om:ar_count » 0 ^■-1UZZER - ON -EDI - ON , lash LED 1 5

f led_couπt > 15 then toggle LEDZ led_couπt - 0 en if else if an_status - AI-ARM2 then BUZZER - OFF LED1 - ON ; lash LED if led_count > 15 then toggle LED2 led_count - 0 endif else if ιaaπ_status DEFENCEl then BUZZER - OFF LED1 - ON ; Flash LEO if led_count > 15 then toggle LEDZ led_couπt - 0 endif .else if ma _status DEFENCE2 then BUZZER - OFF ; Flash LED1, 2 if led_couπt > 15 then toggle LED1 toggle LED2 led_couπt - 0 endif endif endif

; switch o f buzzer if buzzer_count >^*- 10 then buz er_count - 0 clear BUZZER endif eπdlooD

Initialisation procedure

■ro inline Initialise

Setup prescaler and port direction set_option 10000111b ; 1 :256 prescaler on TMRO , TMR0 INT .

,* portB pullups o ff

A 3

43210 76543210 set_I/0 00000000b O lllQO llb ; ports I/O set reset OUTPUTS clear LED1 clear LED? clear 3UZZER clear TX_S0 clear TX_S1 clear TX_S2 clea r TX_SEL set RX_SΞL reset va riables man_status - DISARMED reset FLAGS clear oπ_flag clear alαrπ\_fiag clβΛr defence_flag

clear all counters 16

tx_couπt " 0 raπge_couπt ^*- Q fla^-h- leds }t from couπtl - 5 "set LED1 clear^* LED2 led_cαunt - 0 while led_count < 10 do call TIME endwhile set LED2 clear LED1 led_count — 0 while led_count < 10 do call TIME endwhile nextcount clear LED1 clear LED2 endproc

TIME procedure proc TIME clear_wdt ;clear WATCHDOG timer if bit_set_flag set then if TMR0:7 clear then clear bit_set_flag tx_count++ led_count++ raπge_count++ b zzer_count*t-+ sw_couπt++ eπdi else if TMR0:7 set then set it_set_flag t.^*_couπt++ led_count+-*- rar.ge_co*jnt++ buzzer_count ^■•-•!- sw_couπt++ endif endif πdproc

SΞND_CODE procedure roc SEND_CODE (byte_in)

.^•disable RX clear RX_SEL sec LE01

; setup code if byte in - I then so: ^" TX_30 clear TX_S1 clear TX_S2 else if byte in - 2 then- 17

clear TX_S0 set TX_S1 clear TX_S2 ei—vβ if byte_-.rτ - 3 then let TX_Sύ* sec TX_S1 clear TX_S2 else if byce_iπ - 4 then clear TX_S0 clear TX SI set T.sAsZ else if byte_in » 5 then set TX_SO clear TX SI set TX~S2 else if by*Ce_in - 6 then clear TX_S0 set TX_S1 set TX_SZ else goto TX_END endif

; enable TX set TX_SEL

;wait for TX tκ^cαuπt - .0 while tx_count < 50 do call TIME endwhile

TX_END:

/disable TX clear TX_SEL clear TX_S0 clear TX_S1 clear TX_S2 clear LED1

;enable RX set RX_SEL eπdproc

CHECX_RX procedure proc inline CHECK RX

; enable RX set RX_SEL rx_code - 0 rx_codel - 99

.-tes code if RX_S0 set and RX_S1 clear and RX_S2 clear then rx_codel - ^* 1 else if RX_S0 clear and RX_S1 set. and RX_S2 clear then rx_codel - 2 else if RX_S0 set and RX_S1 set and RX_Ξ2 clear then rκ_codel - 3 eTS~~ if RX_S0 clear and R ^SI clear and RX_S2 set then rx_codel - 4 else if RX_SQ set and RX_S1 clear and RX_S2 set then rx_codel - 5 else if RX_SC clear and RX_S1 se and RX_S2 set then rx_codei - 6 else 18

goto RX_END endi

; f-xc RX again. t> __ .όunt - 0 while tx_cσunc < 3 do call TIME endwhile

; test code if RX_S0 set and RX_S1 clear and RX_S2 clear then rx_code - 1 else if RX_SQ clear and RX_S1 set" and RX_S2 clear then rx_code — 2 else if RX_S0 set and RX_S1 set and RX_S2 clear then rx_code — 3 else if RX_S0 clear and RX_S1 clear and RX_S2 set then rx_code ^■» 4 else if RX_S0 set and RX_S1 clear and RX_SZ set then rx_code* - 5 else if RX_S0 clear and RX_S1 set and RX_S2 set theπ rx_code — 6 else goto RX_E D endif ^""

.^• compare codes if rx_codel - rx_code then ; reset out of range timer range_count - 0 if rx_code - ARMED then man_statU3 - ARMED clear defence_flag clear alar _flag else if rx_code - DISARMED then man_status -- DISARMED clear alaπtt_flag ! else if rx_code - ALARM. Chen maπ_status =» ALARM1 set alarra_flag clear defence_flag else if rx_code - DEEΕNCΞ2 then set defence_flag clear alarro_ lag set LED1 clear LED2 man_status - DEFENCEZ endif endif

^■U<_END : sndDroc

CHΞCK_SW procedure jroc inline CHECK S

sw_status l - 0 sw_status2 - 99

; check sw 1s t Cime if ΞVfl clear or SW2 clear Chen if SW1 clear and S 2 set then sw_status l - 1 else i f SWl set and SW2 clear then

- _s :a: s l - 2 else i f 3'rfl clear and SH2 clear then s^*~^* s ta tus 1 - 3 19

endi else sw_count - 0 — -oto S _END et. if

; wait for SW to settle tx_count - 0 while tx count < 3 do call TIME endwhile

; check sw 2nd time if SWl clear or SW2 clear then if SWl clear and SW2 sec then sw_statusZ - 1 else if SWl set and SW2 clear then sw_3tatus2 - 2 else if SWl clear and SW2 clear Chen sw_3tatus2 - 3 endif else sw_count -0 goto SW_END endif if sw_3tatusl - sw_status^*2 then if sw_statusl - 1 then sw_count - 0 call SEND_CC.DE (DISARMED) else if sw_statusl - 2 then clear BUZZER if π-an_3tatus - AIΛRM1 then sw_count - 0 man_status - ALARM2 else if alarm_flag set and sw_count > 152 then ^• set LED2 sw_couπC - 0 call SEND_C0DΞ(DEFENCΞ2) maπ-_status - DEFENCEl else if defeπce_flag set and sw_count > 20 then sw_count - 0 call SEND_C0DE (ALARM) endif endif else sw_count -0 endif

SW END:

; enable RX set RX SEL eπdproc

EEPROM procedures proc EEVfRlTE(byte in)

EEDATA ^•» oyte_in set EECONl:2 ;set WREN bit

EECON2 - 55h

EECOM2 - OAAh set EECONl:l .see WR bit while EϊCONl:! set do

.^•wait for end of write endwhile clear EEC0N1:2 /clear WREN bit 20

endproc

EEPROM procedures proc EEREAD set EECON1:0 ;set RD bit ■ byte out - EEDATA endproc

21

TABLE 2

Filename CAR CTL.C Program

_ escription ^*\

Di ϋ Author Rev DeCail

17 Oct 1997 S. Cox 1.0

Data

Ifword arm_count Jword led_couπt Sword buzzer_couπt Ifword tx_couπt Sword update_count Sword siren count

Sbyte couπtl

Sbyte rx_code ; ode received SbyCe rx_codel ; code received

Sbyte car status present status of car

; flags

Sbit on_flag

Sbit bit_set_flag

Sbit code_rx_flag

#bit door_flag

Sbit alarm_flag

Sbit siren^flag

;bytes for PROCs Sbyte byte_in

Literals

; INPUTS

-(define ALARM IN PORT : 7 ^■Alarm sensor input (active low)

^define IGN PORTA: 0 ; Igπicion sense ION - high)

^define DOOR PORTA: 5 ;Door sense (high - ciose)

{define C DETECT PORTC: 2 .^•carrier detect (high ^*- signal)

♦define RX SO PORTB : ; received code SO tdefiπe RX SI PORTB : 5 .^•received code SI

'define RX S2 PORTB: 6 ; received code S2

'define RX_S3 PORTB : 7 ; eceived code S3

'define MAN_TX PORTC : 6 ;manual transmit sw

OUTPUTS : define TP1 PORTC 1 ; tescpin define LED PORTA 4 ; ED output define BUZZER PORTC 0 ; buzzer line define RE AY 1 PORTB 0 ; eiayl control define RE AY 2 PORTS 1 relay? control define REUV.3 P0RT3 2 ;relay3 control de ine RELAY4 PGRT3 3 ;relay4 control define T SC PORTA 1 .^•transmit code SO de ine TX SI PORTA 2 ; transmit code SI define TX S2 PORTA :3 ; transmit code Ξ2 define TX_SEL PORTC :5 ; traπsmiter select define RX_SEL PORTC :4 ; receiver select

de ine W-TNC PORTC . -> .^{• •}jamming indic.iticn output

-c s cant.*; 22

Sdji-n- ARMED 1

Sdefine DISARMED 2

Sdefine ALARM 3

Sdef - DEFENCE! 4

Sdefine DEEENCΞ2 5

-egister biCs Literals

CODE

INTERRUPT HANDLER

INT_handler nop endinc

Main entry point for this program main: clear wdt ; clear WATCHDOG tuner call initialise ; setup the environment loop

; checi ti-ner call TIME checic if IMOBILIZΞR ON if oπ_flag set then ar^*m_count - 0 clear doσr_flag

; Flash. ED if led_count > 20 then set LED endif if led_couπt > 40 then clear LED led_count » 0 endif

;check manual TX if MAN TX set then update_count ■^**■ 0 call SEND_CGDE(1) endif

; check RX call CHECK_RX ; code received'' if code_r _flag set then ;chec: received code if r::_code ^•» DISARMED tnen c.i: status - DISARMED

SEMD_CCDE(car_statJS) clear oπ_flaς clear aiar^*τι_£iag clear BUZZER clear LED , LED of set RELA l , enaoie ignition, fuel, e c set RELAΪ2 .enable ignition, fuel, e:c

•set Rf.,.AY2 . enao ignicion, fuel, et clear RELAY 4 .disable defence system else if r-. code ^» 3EFENCE2 then 23

_f a!ar-π_f!ag sec chen c _status - DEFENCE2 SEND_CCDE icar_scatus) set ELAY4 /enable defence system endif else if rx_code - ALARM Chen car_status - ALARM SEND_CCDE ( car_status ) clear RELAΪ4 ;dιsanle defence system else if rx_code - ARMED then car_status - ARMED

SEND_CODE (car_status) clear RE AYS /disable defence system endif endif

/check alarm input if ALARM_IN clear then car_status - ALARM

SEND_CCDE (car_status) buzzer_couπt - 0 set BUZZER update_count - 0 sec alarm_flag set sιren_flag sι en_count - 0 endif else

/check ignition and door if IGN clear Chen /igniCioπ off /check for door closed if DOOR set then /door closed clear LED

/check if door was open, armed if door_flag set tnen if arm_count >- 440 then ; ISsec 850*«28sec /switch on clear RELAY1 /disable ignition, fuel, etc clear RELAY2 , isable ignition, fuel, etc clear RELAY /disable ignition, fuel, ecc car_status - ARMED SEND_CODE (car_status) set on_flag sat LED endif endi else /door open set LED set door_flag arm_count - 0 endif else / ignition ON clear door_flag arm_count - 0 endi endif

.switch off siren if sιren_flag set and sιren_counC >= 300 then .20sec sιren_court — 0 clo r sircn_flag car_status - ARMED endif

. s -lec of buzzer if u;ιa:_coLr: >^■= 152 Choi , isec bu.:e:_co r: = 0 if sιrsr._£_ag claar clear BUZZER 24

.".send status to pager if update_cαunt >- 300 then /lOsec — update_count - 0 *' 3END_CODE(car_scaCus) endif endloop

Inicialisaciαn procedure proc inline Initialise / Setup prescaler and part direction set_optian lOOOOlllb ; 1:256 prescaler on TMRO, TMRO INT. porCB pullups off

A B C 543210 76543210 76543210 set_I/0 00100001b 11110000b 11000100b /ports I/O se

SeCup serialpσrt TXSTA - 00100110b

"0 - Transmit 9th bit (parity) ^Λl - Tx Shift Empty ^Λl - BRGH high speed "0 - Async "1 - TX-enable ^Λ0 - 8biCs

RCSTA - 10010000b

^Λ0 - Recived 9Ch bic (parley) ^Λl - overrun error " 1 - framing error "uπimplimeπtted ^Λ l - continuous reception " 1 - sigπle recepcicπ ^Λ0 - SbiCs ^sl -- sec Dins as TXD and RXD

BAUD race (for BRGH 1) SPBRG - ( (Fosc/baud)/16) - 1

- ( (4MH-79600)/16) - 1

- 25.042

(for BRGH - 0) SPBRG - ( (Fosc/baud)/64) - 1 SPSRG - 25

SeCup incerrupts

INTCON - 00000000b

/"disable all peripheral interrupts /"disable all interrupts

PIE1 - 00000000b

/"TMR1IΞ bit /^••TMR2IE bit / -TXIΞ bit /^ΛRXIΞ bit

SeCup TIMERS

T1 OH - 00000011b /IK prescaler, ext clock, enable T2COM - OlliillOb ,^*16z prescaler, 16x postscaier .?R2 - 23 /lus*16**39**16 = 9.984ms

Setup A/D inputs ADCON0 -^" 0 ADCONi - OOOύύlilb 25

reset OUTPUTS clear LED clear RELAY! clear RE AY2 '"jar RELAY! ciear RELAΪ4 clear BUZZER. clear TX_S0 clear TX_SI clear TX~S2 clear TX_SEL set RK^SEL clear JAfΦfING reset variables car_3tatus - ARMED reset FLAGS set oπ_flag clear door_flag clear alarm_flag clear siren_flag clear all counters arm_count - 0 tx_couπtt - 0 update_count - 0 flash leds count from couπtl - 5 set LED set TP1 led_couπt - 0 while led_count < 5 do call TIME endwhile clear LED clear TP1 led_counc - 0 while led_couπt < 5 do call TIME endwhile nextcount endproc

TIME procedure proc TIME clear_wdt / clear WATCHDOG timer if bi c_sec_flag set then i f TMRO : 7 clea r Chen clear bic_sec_flag arτn_count++ tx_ccuπt^*'-+ led_count*ι-ι- upd a t e_ u π t ++ buccer_count*r-*- si en_count++ endif else if TMRO: 7 set chen sec bit set_flag ιir^*n_cou^*ι:*- t:-:_counc-+ l ed_count t-+ upda te countι*τ H rt

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Claims

28CLAIMS:

1 . A vehicle security system, which includes a base unit located in a vehicle in use and which includes base transmitter means operable to transmit at least one status signal; and a portable remote device which includes remote receiver means operable to receive the status signal, the portable remote device including warning means responsive to the remote receiver means and operable to generate a warning signal when communication between the base unit and the portable remote device is at least impeded.

2. A vehicle security system as claimed in Claim 1 , in which the base unit includes a base transceiver including the base transmitter means and including base receiver means; and the portable remote device includes a remote transceiver including the remote receiver means and including remote transmitter means thereby to permit bi-directional communication between the base unit and the portable remote device.

3. A vehicle security system as claimed in Claim 2, in which the warning means includes a visual indicator which at least intermittently provides a visual indication when communication between the base unit and the portable remote device is at least impeded.

4. A vehicle security system as claimed in Claim 2 or Claim 3, in which the warning means includes an audible warning device which at least intermittently provides an audible indication when communication between the base unit and portable remote device is at least impeded. 29

5. A vehicle security system as claimed in any one of the preceding claims 2 to 4 inclusive, in which the portable remote device includes switching means for selectively disabling the warning means.

6. A vehicle security system as claimed in any one of the preceding claims 2 to 5 inclusive, in which the base unit includes sensing means for sensing unauthorised tampering with the vehicle, the base transmitter means of the base unit being operable in response to transmit a coded alarm condition via the status signal to the warning means of the portable remote device.

7. A vehicle security system as claimed in any one of the preceding claims 2 to 6 inclusive, in which the base transceiver and the remote transceiver each include an encoder and a decoder thereby to permit coding of the status signal.

8. A vehicle security system as claimed in any one of claims 2 to 7 inclusive, in which the base unit includes disabling means for disabling the vehicle, the disabling means being responsive to the base receiver means, and the portable remote device including a switch for activating the portable remote device to transmit a coded disable condition to the base receiver means thereby selectively to permit remote disabling of the vehicle.

9. A vehicle security system as claimed in Claim 8, in which the disabling means includes at least one relay connected in use to an electrical system of the vehicle in such a fashion so as to selectively disable the vehicle.

10. A vehicle security system as claimed in any one of the preceding claims 2 to 9 inclusive, in which the base transceiver and the remote transceiver are frequency modulated transceivers.

1 1 . A vehicle security system as claimed in any one of the preceding claims, in which the portable remote device and the base unit each include a 30 microprocessor based controller operable at least to control coded communication between the portable remote device and the base unit.

12. A method of monitoring unauthorised tampering with a vehicle by means of a vehicle security system including a base unit and a portable remote

5 device which is operable to receive a transmitted signal from the base unit, the method including at least intermittently monitoring reception of the transmitted signal by the portable remote device; generating a warning when reception of the transmitted signal is at least 10 partially impeded; and sensing when unauthorised tampering with the vehicle is sensed and in response thereto generating an alarm.

13. A method as claimed in Claim 1 2, which includes coding the transmitted signal to include information on the status of the vehicle.

1 5 14. A method as claimed in Claim 13, in which the base unit and the portable remote device are operable to communicate in a bi-directional fashion, the method including selectively transmitting a coded disable signal from the portable remote device to the base unit thereby remotely to disable the vehicle.

15. A method as claimed in Claim 14, in which the base unit transmits 20 a coded confirmation signal to the remote unit to confirm receipt of the coded disable signal.

16. A method as claimed in Claim 14 or Claim 1 5, in which the portable remote device transmits a coded confirmation signal to the base unit to confirm receipt of the transmitted signal.

25 17. A portable remote device for use in a vehicle security system, the device including 31 a compact portable housing; receiver means mounted within the housing and operable to receive a status signal from a base station mounted in a vehicle; and monitoring means responsive to the receiver means and operable to generate a warning when communication between the base station and the portable remote device is at least impeded.

18. A portable remote device as claimed in Claim 17, which includes decoding means operable to decode an encoded status signal which includes an alarm code when tampering with the vehicle is sensed by the base unit.

19. A portable remote device as claimed in Claim 18, which includes a remote transceiver including the receiver means thereby to permit bi-directional communication between the portable remote device and the base station.