Antitheft apparatus for vehicle

Abstract: To have electronic control means for preventing theft of a vehicle and electronic control means for controlling ignition timing of an ignition device formed integral and disposed in one package to thereby provide an antitheft apparatus for vehicle being small, economical, and highly capable of preventing theft. The antitheft apparatus for vehicle is constituted of an immobilizer (2), an antitheft electronic control means (3), an ignition device (4), a sensor (6), a remote control means (7), and an alarm means (8).

Description: The present invention relates to a vehicle antitheft apparatus and more particularly to a vehicle antitheft apparatus according to the characteristics of the preamble of claim 1. As a prior art antitheft apparatus for vehicle, there is known a type of antitheft apparatus for vehicle, as disclosed for example in the gazette of Japanese Patent Laid-open . JP-A- 6-286583, so arranged that such an abnormality that the power circuit from the power supply to the ignition device is made or broken by a key operation, the switch mechanism of the ignition switch for controlling the traveling of the vehicle is broken or removed, or the like is detected by a sensor and, thereupon, the function of at least one component of the ignition device is controlled, i.e., the ignition device is made inoperable and starting of the engine is made impossible. Also, such an antitheft apparatus for vehicle is known in which various functions for preventing theft are controlled by remote control. Further, an antitheft apparatus for vehicle is known in which a lock cable attachable and detachable by a key operation is used for engaging a vehicle with a suitable structure to thereby prevent the vehicle from being thieved. In the antitheft apparatus for vehicle disclosed in the gazette of Japanese Patent Laid-open JP-A- 6-286583, the electronic control means including a CPU (Central Processor Unit) for preventing theft and the electronic control means for controlling the ignition timing of the ignition device to start the vehicle engine are designed to function independently of each other and they are not formed integral. Therefore, there has been such a possibility that either of the electronic control means starts to perform other function than is desired. Further, in the prior art antitheft apparatus for vehicle in which various functions for preventing theft are controlled by remote control, since the electronic circuit portion of the receive portion for the remote controlling installed on the side of the vehicle is not integrally formed with the electronic control means of the antitheft apparatus for vehicle, there is present an independent wiring connecting the receive portion to the electronic control means of the antitheft apparatus for vehicle. Therefore, there has been such a possibility that a physical load is placed on the wiring and a short circuit or the like is caused and a malfunction occurs. Further, in the prior art antitheft apparatus for vehicle in which a lock cable is used, since the electronic control means detecting breakage of the lock cable for coping with theft is not integrally formed with the electronic control means of the antitheft apparatus for vehicle, there is present an independent wiring connecting the electronic control means of the lock cable to the electronic control means of the antitheft apparatus for vehicle. Therefore, there has been such a possibility that a physical load is placed on the wiring and a short circuit or the like is caused and a malfunction occurs. US-A-5 467 070 discloses an antitheft system which comprises a control circuit with receiver and several output signal means for connection with separate vehicle disabling means, such as an inition disable, pump disable or starter disable and other vehicle devices to prevent theft. EP-A-0 618 113 discloses an antitheft device for preventing theft of a vehicle by controlling the ignition system of the vehicle. US-A-4 878 045 discloses an antitheft device for preventing theft of a vehicle by use of a locking cable which is connected to the vehicle. The antitheft device transmits a photo signal through the locking cable and activates a warning device when the locking cable is damaged or separated from the antitheft device. GB-A-2 261 026 discloses a vehicle engine immobiliser for preventing theft of a vehicle. The engine immobilizer only corrects the ignition timing output of a mis-timed ignition sensor to its correct setting in response to authorised operation of an electronic coded security lock to enable engine opperation. A vehicle antitheft apparatus for protecting a vehicle according to the preamble of claim 1 is known from US-A 5 307 048. This prior art antitheft apparatus includes an electronic control portion detecting an unjust operation of the vehicle and thereupon functioning to prevent the vehicle from being thieved. The antitheft apparatus is provided with electronic control means responsive to a signal generated upon detection of an unjust operation of a vehicle for preventing the vehicle from being thieved by interacting with a disablement device which disables and enables, for example, the vehicle's engine by interrupting the electrical power supply, for example, to an ignition coil. However, as the vehicle antitheft apparatus and an electronic control means of the ignition device are designed to function independently of each other and are separated from each other, there is a possibility that either of the electronic control means and ignition device starts to perform other functions than desired or can be bypassed. The present invention has been made to solve the above mentioned technical problems and it is an object of the invention to provide an vehicle antitheft apparatus having electronic control means for preventing theft of a vehicle and electronic control means for controlling ignition timing of an ignition device formed integrally and disposed in one package and, therefore being small, economical, and highly capable of preventing theft. This object is achieved by the features of claim 1. The present invention with the above described configuration has the following effects. Since the antitheft apparatus for vehicle according to the invention comprises antitheft electronic control means integrally formed of electronic control means responsive to a signal generated upon detection of an unjust operation of a vehicle for preventing the vehicle from being thieved and electronic control means for controlling ignition timing of an ignition device starting the engine of the vehicle, it can dispose the antitheft electronic control means on the same substrate and in one package. The invention comprises antitheft electronic control means integrally formed of electronic control means for preventing theft of a vehicle in response to a detection signal of an unjust operation of the vehicle and electronic control means for controlling ignition timing of the ignition device starting the vehicle engine, and the antitheft electronic control means can be disposed on the same substrate and in one package. Therefore, an antitheft apparatus for vehicle being small, highly capable of preventing theft, and available at low cost because of commonly usable component parts can be provided. Further, the antitheft electronic control means integrally comprise an electronic circuit portion of the receive portion of remote control means for controlling the antitheft apparatus for vehicle to be operable/inoperable. Therefore, both the members can be disposed on the same substrate and in one package, and accordingly it is made very difficult to place a physical load between the input and the output of the antitheft electronic control means and the electronic circuit portion of the receive portion. The antitheft apparatus comprises antitheft electronic control means integrally formed with an electronic circuit portion of the receive portion of remote controlled means for making the antitheft apparatus for vehicle operable/inoperable and both the members can be disposed on the same substrate and in one package. Therefore, it can be made very difficult to place a physical load between the input and the output of the antitheft electronic control means and the electronic circuit portion of the receive portion and, accordingly, an antitheft apparatus for vehicle being small, quite operable, and highly capable of preventing theft can be provided. Further, the antitheft apparatus for vehicle according to the invention comprises lock means for engaging a structural member of the vehicle to another structural member of the vehicle or a structural member of a body other than the vehicle, lock control means for controlling the lock means, and alarm means for sounding an alarm upon detection of unjust unlocking of the lock means, in which the lock control means and the antitheft electronic control means are formed integral. Therefore, the lock control means and the antitheft electronic control means can be disposed on the same substrate and in one package, and accordingly it is made very difficult to place a physical load between the input and the output of the lock control means and the antitheft electronic control means so that the capability of preventing theft can be improved. Further, the antitheft apparatus comprises lock means for engaging a structural member of the vehicle with another structural member of the vehicle or a structural member of a body other than the vehicle, lock control means for controlling the lock means, and alarm means for sounding an alarm upon detection of unjust unlocking of the lock means, and has the lock control means integrally formed with the antitheft electronic control means and can have the lock control means and the antitheft electronic control means disposed on the same substrate and in one package. Therefore, it can be made very difficult to place a physical load between the input and the output of the lock control means and the antitheft electronic control means and, accordingly, an antitheft apparatus for vehicle having high capability of preventing theft and high reliability can be provided. Further, the antitheft apparatus for vehicle according to the invention comprises connection means for electrically and mechanically connecting thereto a lock cable disengageable by a key operation for engaging the vehicle with a suitable structural member to prevent the same from being thieved and alarm means for sounding an alarm upon detection of breakage of the lock cable, in which electronic control means of the lock cable and the antitheft electronic control means are formed integral. Therefore, both the means can be disposed on the same substrate and in one package, and accordingly it is made very difficult to place a physical load between the input and the output of the electronic control means of the lock cable and the antitheft electronic control means so that the capability of preventing theft can be improved. The antitheft apparatus comprises connection means for connecting thereto electrically and mechanically a lock cable unlockable by a key operation for engaging the vehicle with a suitable structural member for preventing theft of the vehicle and alarm means for sounding an alarm upon detection of breakage of the lock cable and has the electronic control means of the lock cable and the antitheft electronic control means formed integral and can have them disposed on the same substrate and in one package. Therefore, it can be made very difficult to place a physical load between the input and the output of the electronic control means of the lock cable and the antitheft electronic control means and, accordingly, an antitheft apparatus for vehicle having higher capability of preventing theft and higher reliability can be provided. Therefore, an antitheft apparatus for vehicle being small, available at low cost, highly capable of preventing theft, and highly reliable can be provided. Preferred Embodiments A preferred embodiment of the invention will be described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a general block diagram of an antitheft apparatus for vehicle according to the invention. FIG. 2 is a block diagram of the principal portion of the antitheft apparatus for vehicle according to the invention. FIG. 3 is a block diagram of the principal portion of the antitheft apparatus for vehicle provided with a lock cable according to the invention. FIG. 1 is a general block diagram of an antitheft apparatus for vehicle according to the invention. Referring to FIG. 1, an antitheft apparatus for vehicle 1 includes an immobilizer 2, an antitheft electronic control means 3, an ignition device 4, a sensor 6, a remote control means 7, and an alarm means 8. The antitheft electronic control means 3 is configured principally of a one-chip microcomputer (CPU) having functions of RAM, ROM, I/O control, interrupt control, timer, and the like and has an electronic control means for controlling ignition timing of the ignition device 4 and an electronic control means for controlling operation of the immobilizer 2 which are formed integral and disposed in one package. The antitheft electronic control means 3 controls the immobilizer 2 and the alarm means 8 in response to a sensor signal S6 from the sensor 6 and a control signal S7 from the remote control means 7. The immobilizer 2, in response to an immobilizer control signal S3B from the CPU 10, on/off controls a switch means 2B to turn it on/off to thereby control the alarm means 8 to be rendered operable/inoperable and, further, the same on/off controls a switch means 2A to turn it on/off to thereby control the ignition device 4 to be rendered operäble/inoperable. The antitheft electronic control means 3 of the antitheft apparatus for vehicle 1 according to this embodiment of the invention has, as described above, the electronic control means of the ignition device 4 and the electronic control means of the immobilizer 2 formed integral, and, hence, it can be disposed in one package. FIG. 2 is a block diagram of the principal portion of the antitheft apparatus for vehicle according to the invention. Referring to FIG. 2, the antitheft electronic control means 3 includes the immobilizer 2, voltage stabilizer means 11, backup power supply 12, CPU (Central Processing Unit) 10, voltage detector means 13, switch means 14, acceptance means 15, ignition device portion 17, resistor R1, and diode D1. Further, the antitheft electronic control means 3 has, on its periphery, the sensor 6, various ignition timing controlling sensors 18, transmit portion 7B, receive sensor 16, alarm means 8, on-vehicle battery 9, main switch SW1, and horn switch SW2. The remote control means 7 is formed of a receive portion 7A and a transmit portion 7B, of which the receive portion 7A is installed on the vehicle and the transmit portion 7B is carried as a portable unit by the driver. By operation of the transmit portion 7B, a control signal S7B is transmitted by means of electric wave, supersonic wave, infrared ray, and the like. The receive sensor 16 of the receive portion 7A receives the control signal S7B transmitted from the transmit portion 7B and outputs a receive signal S16 to the acceptance means 15. The acceptance means 15 of the receive portion 7A is included in the antitheft electronic control means 3 and formed integral therewith. The acceptance means 15 accepts the receive signal S16 and outputs an acceptance signal S7A to the CPU 10. As the CPU 10, a one-chip microcomputer having functions of RAM, ROM, I/O control, interrupt control, timer, and the like is used and it applies an error correcting process to the acceptance signal S7A from the acceptance means 15 and controls various apparatuses installed on the vehicle in accordance with the error-corrected acceptance signal S7A. The sensor 6 installed on the vehicle includes a sensor detecting breakage of the lead wire connected to the main switch SW1, a vibration sensor for detecting a vibration of the vehicle, a supersonic sensor for detecting movement of the vehicle by means of supersonic waves, an infrared sensor for detecting movement of the vehicle by means of infrared rays, and the like and it outputs a sensor signal S6 to the CPU 10 upon detection of an unjust operation of the vehicle. In order to prevent theft of the vehicle, the CPU 10, when the sensor 6 installed on the vehicle detects an unjust operation of the vehicle, outputs, in response to the sensor signal S6 output from the sensor 6, an immobilizer control signal S3B to the switch means 2B of the immobilizer 2 to thereby turn the switch means 2B on so that power from the on-vehicle battery 9 is supplied to the alarm means 8 and, further, outputs an alarm control signal S3C to the alarm means 8 so that it gives an alarm. Further, the CPU 10, in response to the sensor signal S6 output from the sensor 6, outputs the immobilizer control signal S3B to the switch means 2A of the immobilizer 2 to turn the switch means 2A off so that power supply from the on-vehicle battery 9 to the ignition device portion 17 is cut off and, further, brings the output of an ignition timing control signal S3A to the ignition coil 17' to zero to thereby inhibit the ignition plug from igniting and makes it impossible for the engine to start. When the main switch SW1 is on, the CPU 10 makes the alarm means 8 inoperable and the remote control means 7 inoperable, and when the main switch SW1 is off, the CPU 10, in response to turning on of the mounted-electric-parts control switch (horn switch) SW2, causes the receive portion 7A of the remote control means 7 to be operable for a predetermined period of time so as to be held in its stand-by state capable of receiving signal transmission from the transmit portion 7B. Then, the CPU 10, after holding the receive portion 7A operable for the predetermined period of time, cuts off the power supply to the receive portion 7A to thereby stop the operation of the receive portion 7A. The predetermined operable period of time of the receive portion 7A of the remote control means 7 is preferably set to 60 seconds or so. The voltage stabilizer means 11 of the antitheft electronic control means 3 produces a stabilized DC voltage V2 from a DC voltage V1 supplied from the on-vehicle battery 9 through a fuze F1 and the main switch SW1 and supplies the stabilized DC voltage V2 to the CPU 10. Power for the receive portion 7A of the remote control means 7 is supplied from the on-vehicle battery 9 through the switch means 14 and power for the alarm means 8 is supplied from the on-vehicle battery 9 through the switch means 2B. When the main switch SW1 is on, the CPU 10 detects that the stabilized DC voltage V2 is applied to the power terminal of the CPU 10 and outputs a switch control signal S10A to the switch means 14 to turn off the switch means 14 so as to cut off the supply of the DC voltage V1 to the receive portion 7A and render the receive portion 7A inoperable and, further, outputs the immobilizer control signal S3B to the switch means 2A to turn off the switch means 2A so as to cut off the supply of the DC voltage V1 to the alarm means 8 and render the alarm means 8 inoperable. Further, in order to reduce the load on the backup power supply 12, the CPU 10 outputs a control signal S10B to the voltage detector means 13 to thereby isolate the voltage detector means 13 from the backup power supply 12 or reset the same into its state consuming a minimum current. When the main switch SW1 is off, the voltage supplied from the voltage stabilizer means 11 of the antitheft electronic control means 3 to the CPU 10 becomes zero and the CPU 10 is driven by a DC voltage V3 of the backup power supply 12. Then, the CPU 10 detects that the voltage at its power terminal is below a specified voltage and outputs a control signal S10B to the voltage detector means 13 to set the voltage detector means 13 into its operable state. The DC voltage V3 of the backup power supply 12 is applied between the terminals of the horn switch SW2 through the resistor R1 and the diode D1. By turning on of the horn switch SW2, a switch-on control signal S12 is input to the voltage detector means 13. The diode D1, when the main switch SW1 is on, prevents application of the DC voltage V1 to the backup power supply 12 and the CPU 10, while the resistor R1 prevents an overcurrent flowing from the backup power supply 12 by turning on of the horn switch SW2. As the switch for inputting the switch-on control signal S12 to the voltage detector means 13, a switch other than the horn switch SW2, excepting the main switch SW1, may be used. The voltage detector means 13, in response to the switch-on control signal S12, outputs a timer starting signal S13 to the CPU 10. The CPU 10, in response to the timer starting signal S13, starts the timer operation and outputs a switch control signal S10A to the switch means 14 so that the switch means 14 is held in its on state for a predetermined period of time until the timer operation is ended. The receive portion 7A is supplied with the DC voltage V1 from the on-vehicle battery 9 through the switch means 14 and rendered capable of signal reception for a predetermined period of time, and, upon receiving a control signal S7B from the transmit portion 7B, outputs an acceptance signal S7A to the CPU 10. When the acceptance signal S7A from the acceptance means 15 is an instruction signal to set the alarm means 8, the CPU 10, in order that the DC voltage V1 from the on-vehicle battery 9 is supplied to the alarm means 8 and the alarm means 8 is rendered operable, outputs an immobilizer control signal S3B to the switch means 2B of the immobilizer 2 to turn on the switch means 2B. The CPU 10, when a predetermined period of time has passed according to the timer operation of the CPU 10, outputs a switch control signal S10A to turn off the switch means 14 and render the receive portion 7A inoperable. As described in the foregoing, the antitheft electronic control means 3 of the antitheft apparatus for vehicle 1 has the immobilizer 2, voltage stabilizer means 11, backup power supply 12, CPU 10, voltage detector means 13, switch means 14, acceptance means 15, ignition device portion 17, and the like formed integral and, therefore, it can be disposed in one package. Further, continuously flowing of the operating current into the receive portion is prevented and, thereby, the load on the on-vehicle battery can be reduced. To release the alarm means of the antitheft apparatus for vehicle by the remote control means, it is required to render the receive portion of the remote control means capable of signal reception by performing a predetermined switch operation, and, thereby, the theft preventing capability can be improved. FIG. 3 is a block diagram of the principal portion of the antitheft apparatus for vehicle provided with a lock cable according to the invention. Referring to FIG. 3, the antitheft apparatus for vehicle 20 has an antitheft electronic control means 21 and a lock cable 23. The antitheft electronic control means 21 includes a remote control portion 25, a charger delay circuit 26, a backup power supply 27, an unlocking actuator 28, a release button 29, a switch means 30, a switch means 31, an ignition device 32 such as CDI, a CPU 34, a siren 35, a connection means 36, resistors (R2, R3), diodes (D2, D3, D4, D5), and transistors (Tr1, Tr2, Tr3). The lock cable 23 includes a light emitting diode LED1, an optical fiber cable 23F, an electric wire 23W, and a phototransistor PT1 within the cable. The antitheft apparatus for vehicle 20 has, on its periphery, a remote control unit (transmit portion) 24, an on-vehicle battery 22, a main switch SW3, a horn switch SW4, a horn H1, a starter switch SW5, a starting electromagnetic switch 33, a clutch switch SW6, a side stand switch SW7, a neutral lamp L, a neutral lamp switch SW8, diodes (D6, D7), and general loads. When the main switch SW3 is turned off, the CPU 34 changes the transistor Tr2 into its cutoff state and turns off the switch means 30 and switch means 31. Thereby, the power supply lines connecting the on-vehicle battery 22 with the ignition device 32 and the starter electromagnetic switch 33 through the main switch SW1 3 are electrically opened so that engine ignition and motor operation are inhibited. Further, providing the CPU 34 with a timer function, it may be adapted such that the transistor Tr2 is cut off when 10 seconds or so have passed after the main switch SW3 was turned off and, thereby, the engine ignition and motor operation are inhibited. When the lock cable 23 is set in the connection means 36 of the antitheft apparatus for vehicle 20, the connection means 36 applies a bias to the phototransistor PT1 of the lock cable 23 and supplies a forward current to the light emitting diode LED1 through the electric wire 23W so that the same is caused to emit light and the emitted light is received by the phototransistor PT1 through the optical fiber cable 23F. When the lock cable 23 was once set in the connection means 36 of the antitheft apparatus for vehicle 20, the CPU 34 detects that the lock cable 23 is set in the connection means 36 and controls the unlocking actuator 28 such that the release button 29 is restrained and the setting of the lock cable 23 in the connection means 36 cannot be unlocked. When the lock cable 23 is broken, it follows that the electric wire 23W and the optical fiber cable 23F are also broken. Then, the optical input to the phototransistor PT1 is stopped and the phototransistor PT1 is put into its cutoff state. This fact is detected by the CPU 34 and the transistor Tr1 is driven to turn on. Thus, a current is supplied from the on-vehicle battery 22 to the siren 35 through the resistor R2 and the diode D2 so that an alarm sound is emitted. If the lock cable was once broken, the alarm sound by the siren 35 is not stopped even if the lock cable is connected again. In order to detect breakage of the lock cable 23 more positively, the forward current passed through the LED1 may be modulated to thereby modulate the emitted light therefrom so that a tricking operation by the use of a bypass circuit or the like after breakage of the lock cable 23 is made difficult. When the main switch SW3 is turned on while the inhibition of engine ignition and motor operation is not released, the CPU 34 drives the transistor Tr1 to turn on and allows current to flow from the on-vehicle battery 22 to the siren 35 through the resistor R2 and the diode D2 to cause an alarm sound to be made, and when the main switch SW3 is turned off, it puts the transistor Tr1 into its cutoff state and stops the alarm sound. The remote control portion (receive portion) 25 is held operable for a predetermined period of time set by the timer operation of the CPU 34 after a specific switch of the vehicle (the horn switch SW4 in the present embodiment) was operated and enabled to receive instructions from the remote control unit (transmit portion) 24. When the remote control portion 25, while it is ready to receive signals, has received an instruction signal from the remote control unit 24, the antitheft apparatus for vehicle 20 can release the inhibition of the engine ignition and motor operation in accordance with the received instruction signal. In the case where the engine is not started within the predetermined period of time set by the timer operation of the CPU 34 after the inhibition of the engine ignition and motor operation was released, the engine ignition and motor operation are inhibited again after the predetermined period of time has passed. In the antitheft apparatus for vehicle 20, when the remote control portion 25 has received an instruction signal from the remote control unit 24 while it is ready to receive signals, the CPU 34, in response to the received instruction signal, controls the unlocking actuator 28 to remove restrictions on the release button 29. Then, by depressing the release button 29, the lock cable 23 can be unlocked from the connection means 36. In the case where the lock cable 23 is not unlocked from the connection means 36 within the predetermined period of time set by the timer operation of the CPU 34 after the restrictions on the release button 29 are removed by the unlocking actuator 28, the release button 29 is placed under restrictions again after the predetermined period of time has passed. As described in the foregoing, the antitheft apparatus for vehicle 20 comprises the lock cable 23, connection means 36, charger delay circuit 26, backup power supply 27, unlocking actuator 28, release button 29, CPU 34, switch means 30, switch means 31, CDI ignition device 32, electromagnetic switch for starter 33, remote control portion 25, resistor R2, resistor R3, diode D2, diode D3, diode D4, transistor Tr1, transistor Tr2, and the transistor Tr3, and, hence, the capability of preventing theft can be improved while the operating current is prevented from continuously flowing into the remote control portion 25 and thereby the load on the on-vehicle battery is lightened. Further, the above described antitheft apparatus for vehicle may be adapted such that a stand lock device is provided on the main stand, a control portion is provided in the body of a vehicle, and locking or unlocking of the stand lock device can be achieved by remote controlling with a remote control unit. In the described antitheft apparatus for two-wheel or three-wheel vehicle, the main stand is locked by the stand lock device with the main stand in its erected position. Therefore, even if it is attempted to move the vehicle as it is, the main stand touching the road face interferes with the movement and, hence, the theft of the vehicle can be prevented. The antitheft apparatus for vehicle may further be provided with a steering wheel lock unit for locking or unlocking the steering wheel so that the steering wheel can be locked or unlocked. In the described antitheft apparatus for vehicle, the steering wheel is fixed and held unrotatable when the steering wheel lock unit is in its locked state and theft of the vehicle is thereby prevented. Further, the above described antitheft apparatus for vehicle may be provided with a lock means which makes it impossible to change gear from low gear if the gear is set in low gear when the vehicle is parked and adapted such that the lock means is locked or unlocked by remote control using a remote control unit. Since, in the antitheft apparatus for vehicle provided with the above described lock means, an igniting operation is inhibited by the immobilizer when theft of the vehicle is detected, it is required for the thief to walk pushing the vehicle with its gear set in low gear, and, besides, the siren is kept sounding, theft of the vehicle becomes very difficult. In summary, it is a problem to have electronic control means for preventing theft of a vehicle and electronic control means for controlling ignition timing of an ignition device formed integral and disposed in one package to thereby provide an antitheft apparatus for vehicle being small, economical, and highly capable of preventing theft. Therefore, the antitheft apparatus for vehicle is constituted of an immobilizer 2, an antitheft electronic control means 3, an ignition device 4, a sensor 6, a remote control means 7, and an alarm means 8. The above described mode for carrying out the invention is just an embodiment and the invention is not limited to the above described mode. Reference Numerals : 1, 20 ... Antitheft apparatus for vehicle, 2... Immobilizer, 2A ... Switch means, 2B ... Switch means, 3 ... Antitheft electronic control means, 4 ... Ignition device, 6... Sensor, 7... Remote control means, 7A... Receive portion, 7 ... Transmit portion, 8... Alarm means, 9... On-vehicle battery, 10, 34 ... CPU, 11... Voltage stabilizer means, 12... Backup power supply, 13... Voltage detector means, 14... Switch means, 15... Acceptance means, 16... Receive sensor, 17... Ignition device portion, 18... Various sensors for controlling ignition timing, 23... Lock cable, 23F... Optical fiber cable, 23W... Electric wire, 25... Remote control portion, 2 ... Charger delay circuit, 27... Backup power supply, 28... Unlocking actuator, 29... Release button, 30, 31 ... Switch means, 32... Ignition device, 33... Electromagnetic switch for starter, 36... Connection means, D1, D2, D3, D4, D5, D6, D7... Diodes, F1... Fuse, L... Neutral lamp, LED1... Light emitting diode, PT1... Phototransistor, R1, R2, R3... Resistors, S3A... Ignition timing control signal, S3B... Immobilizer control signal, S3C... Alarm control signal, S6... Sensor signal, S7... Control signal, S7A... Acceptance signal, S7B... Control signal, S10A... Switch control signal, S10B... Control signal, S12... Switch-on control signal, S13... Timer starting signal, S16... Receive signal, SW1, SW3... Main switches, SW2, SW4... Horn switches, SW5... Starter switch, SW6... Clutch switch, SW7... Side stand switch, SW ... Neutral switch, Tr1, Tr2, Tr3 ... transistors, V1, V2, V3 ... DC voltages Reference Numerals in drawings : FIG. 1 1 ... Antitheft apparatus for vehicle 2 ... Immobilizer 3 ... Antitheft electronic control means (CPU) 4 ... Ignition device 4' ... Ignition coil 6 ... Sensor 7 ... Remote control means 8 ... Alarm means FIG. 2 3 ... Antitheft electronic control means 2 ... Immobilizer 10 ... CPU 11 ... Voltage stabilizer means 12 ... Backup power supply 13 ... Voltage detector means 17 ... Ignition device portion 17' ... Ignition coil 7 ... Remote control means 15 ... Acceptance means 16 ... Receive sensor 7A ... Receive portion 7B ... Transmit portion 6 ... Sensor 8 ... Alarm means 18 ... Ignition timing controlling sensors H1 ... Horn FIG. 3 20 ... Antitheft apparatus for vehicle 21 ... Antitheft electronic control circuit 23 ... Lock cable 24 ... Remote control unit 25 ... Remote control portion 26 ... Charge delay circuit 28 ... Unlocking actuator 29 ... Release button 32 ... CDI ignition device 32' ... Ignition coil 33 ... Electromagnetic Switch for starter 34 .. CPU 35 ... Siren 38 ... Ignition timing controlling sensors SW3... Main switch L ... Neutral lamp H1 ... Horn GL ... General loads

Claims: Vehicle antitheft apparatus comprising an electronic control portion (21, 34, PT1, 32, H1) detecting an unjust operation of a vehicle and thereupon functioning to prevent the vehicle from being thieved, said vehicle antitheft apparatus comprising antitheft electronic control means (21) integrally formed of electronic control means (34) responsive to a signal generated upon detection of an unjust operation of the vehicle for preventing the vehicle from being thieved, wherein said antitheft electronic control means (21) integrally comprise an electronic circuit portion (25) of a receive portion of remote control means (25, 24) for controlling said vehicle antitheft apparatus to be operable/inoperable and wherein said vehicle antitheft apparatus comprises lock means (23) for engaging a structural member of the vehicle to another structural member of the vehicle or a structural member of a body other than the vehicle and lock control means (PT1, 28) for controlling said lock means (23), characterized in that said lock means comprise a lock cable (23), and said vehicle antitheft apparatus comprises connection means (36) for electrically and mechanically connecting thereto the lock cable (23) disengageable by a key operation for engaging the vehicle with said structural member to prevent the vehicle from being thieved, said vehicle antitheft apparatus further comprising alarm means (35) for sounding an alarm upon detection of breakage of said lock cable (23), wherein said antitheft electronic control means (21) is furthermore integrally formed of electronic control means (32) for controlling ignition timing of an ignition device (32) starting the engine of the vehicle and is integrally formed of electronic control means (PT1, 28) of said lock cable (23).

Inventors: NAKAJIMA YOSHIYUKI, NAKAJIMA, YOSHIYUKI
Applicants: HONDA MOTOR CO LTD, HONDA GIKEN KOGYO KABUSHIKI KAISHA
Application year: 1997
Main classification: B60R25
IPC codes: F02D45, F02P11, F02D17, B60R25, F02D29