JP2011126293A - Theft deterrent device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stop a motorcycle safely when user authentication fails in a theft deterrent device mounted on a kick start type motorcycle in particular. <P>SOLUTION: The user authentication is performed while an engine is running (steps S1-S3). If the user authentication fails and the engine speed is higher than a predetermined safe stop speed at the time the user authentication finishes, the engine speed is gradually reduced, and the engine is stopped when the engine speed becomes the safe stop speed or below (steps S6-S14). Thus, falling of the motorcycle due to sudden stop of the engine is prevented, and the motorcycle can be stopped safely. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a theft deterrent device (immobilizer) that is particularly suitable for being mounted and used in a kick start type motorcycle.

  Conventionally, when a theft deterrence device is mounted on this type of motorcycle, if the battery is in an open state, power is not supplied to the theft deterrence device, so user authentication cannot be performed. As a result, even a legitimate user cannot drive the motorcycle.

In order to eliminate such inconvenience, there is a method to perform user authentication while the engine is rotating by kick-starting the engine once and supplying power to the anti-theft device even when the battery is open. It has been proposed (see, for example, Patent Document 1). This method allows the engine to continue rotating when user authentication is successful (when it is certified as a legitimate user), and when user authentication fails (when it is not certified as a legitimate user). When) stop the engine.
JP 2001-18753 A (paragraphs [0005] to [0007], FIG. 1)

  However, this will cause the engine to start before user authentication ends (that is, before it is determined whether the user is a legitimate user). A two-wheeled vehicle can be driven. Therefore, if the person who ran the motorcycle is a person other than a legitimate user, especially when the car body is tilted due to cornering, etc., the situation where the engine falls suddenly due to failure of user authentication and the engine suddenly stopping In order to avoid this, there was a strong demand to stop the vehicle safely.

  In view of such circumstances, it is an object of the present invention to provide a theft deterrent device capable of safely stopping a vehicle such as a motorcycle when user authentication fails.

  In order to achieve such an object, the invention according to claim 1 is theft deterrent configured to perform user authentication while the engine is rotating and to stop the engine when the user authentication fails. An engine monitoring means for detecting an engine rotation speed of the engine; and when the user authentication is completed and the user authentication is unsuccessful, the engine rotation speed of the engine is predetermined when the user authentication is completed. Engine deceleration means for gradually decreasing the engine rotation speed of the engine when the engine rotation speed is lower than the safe stop speed, and engine stop means for stopping the engine when the engine rotation speed of the engine becomes equal to or less than the safe stop speed. And a theft deterrent device provided.

  Further, the invention according to claim 2 is the configuration according to claim 1, wherein when the engine speed reduction means decreases the engine speed of the engine, the engine speed is increased by a predetermined differential speed. It is characterized by being lowered step by step.

  The invention according to claim 3 is characterized in that, in addition to the configuration according to claim 1 or 2, the safe stop speed is an idling rotation speed.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the engine monitoring means is configured such that the engine rotation speed of the engine is based on a voltage waveform output from a rectifier regulator. Is detected.

  Further, in the invention according to claim 5, in addition to the configuration according to any one of claims 1 to 3, the engine monitoring means uses the ignition timing signal output from the pulsar generator to generate the engine of the engine. The rotational speed is detected.

  According to the first aspect of the present invention, even when the user authentication fails, the engine is stopped after the safety stop speed is reached. Therefore, the vehicle is prevented from falling over due to the sudden stop of the engine, thereby making the vehicle safe. It is possible to prevent the vehicle from being stolen while stopping.

  Further, according to the invention described in claim 2, since the engine rotation speed is decreased stepwise, it is possible to avoid a situation where the engine rotation speed is decreased at a stretch and the vehicle suddenly stalls, thereby further improving safety. Can do.

  Moreover, according to the invention of Claim 3, there exists the same effect as the invention of Claims 1 and 2.

  Further, according to the invention described in claim 4, since the engine rotation speed can be detected by effectively utilizing the existing parts (rectifier regulator), an increase in manufacturing cost due to an increase in the number of parts can be avoided. Is possible.

  Furthermore, according to the invention described in claim 5, since the engine rotation speed can be detected by effectively utilizing the existing parts (pulsar generator), it is possible to avoid an increase in manufacturing cost due to an increase in the number of parts. Is possible.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention

  1 to 3 show a first embodiment of the present invention.

  First, the configuration will be described.

  As shown in FIG. 1, the scooter type motorcycle 1 includes an AC magneto generator 4, a half-wave rectifier rectifier regulator 3, a battery 5, an AC load 6 such as a headlight, a DC load 7 such as a meter, a main A switch 9, a pulsar generator 10 such as a pickup coil, an ignition unit 11, a theft deterrent device 2, and the like, are of a kick start type in which a kick lever (not shown) is depressed to start the engine. The antitheft device 2 includes a microcomputer 21, an input circuit 22, an AD conversion circuit 25, an output control circuit 26, and a power supply circuit 27.

  Here, a rectifier regulator 3 and an AC load 6 are connected to the AC magneto generator 4 as shown in FIG. A battery 5 is detachably connected to the rectifier regulator 3 and a DC load 7 is connected thereto. Further, the rectifier regulator 3 is connected to the input circuit 22 of the theft deterrence device 2 via the main switch 9 and to the power supply circuit 27 of the theft deterrence device 2. The ignition unit 11 is connected to the pulsar generator 10 and to the output control circuit 26 of the antitheft device 2.

  Further, in the antitheft device 2, the input circuit 22 is connected to the AD conversion circuit 25, the AD conversion circuit 25 is connected to the microcomputer 21, and the microcomputer 21 is further connected to the output control circuit 26. . The power supply circuit 27 is configured to be able to supply power to the input circuit 22, the AD conversion circuit 25, the microcomputer 21, and the output control circuit 26.

  Further, the microcomputer 21 stores a user authentication program PRG shown in FIG. Further, the microcomputer 21 stores a differential rotational speed dF and a safe stop speed Fe so as to be freely read out. Here, the differential rotational speed dF means a reduction amount for one time when the engine rotational speed is gradually decreased, and is, for example, 500 rpm. Further, the safe stop speed Fe means an engine rotation speed at which the traveling motorcycle 1 can be safely stopped. Here, the idling rotation speed (for example, 1,500 rpm) is set to the safe stop speed Fe. ing.

  Next, the operation will be described.

  In the motorcycle 1 having the above-described configuration, when starting the engine, the main switch 9 is turned on and the engine is kick-started. Then, the AC magneto generator 4 rotates to generate electric power, a voltage waveform is output from the rectifier regulator 3 and input to the antitheft device 2, and power is supplied from the antitheft device 2 to the ignition unit 11. As a result, the plug (not shown) ignites and the engine starts to rotate. At this time, since the ignition timing signal is output from the pulsar generator 10 to the ignition unit 11 according to the rotation of the AC magneto generator 4, the engine rotates smoothly.

  Then, in order to prevent the motorcycle 1 from being stolen by a person other than the authorized user, the microcomputer 21 of the anti-theft device 2 reads the user authentication program PRG shown in FIG. Perform user authentication operations based on

  First, in the battery state determination step (step S1 of the user authentication program PRG), the microcomputer 21 forms the voltage waveform output from the rectifier regulator 3 and input to the input circuit 22 of the antitheft device 2 via the main switch 9. Based on the above, it is determined whether or not the battery 5 is in an open state. That is, if this voltage waveform remains half-wave rectified and is not smoothed, it is determined that the battery 5 is in an open state, and if it is half-wave rectified and smoothed, the battery 5 Is not open (closed).

  If the result of this determination is that the battery 5 is in the open state, power cannot be supplied from the battery 5 to the theft deterrent device 2, so the routine proceeds to the engine ignition temporary permission step (step S 2 of the user authentication program PRG), and the microcomputer 21 Turns on the output control circuit 26 to temporarily allow engine ignition. Then, power is supplied from the AC magneto generator 4 to the antitheft device 2 via the rectifier regulator 3 by kick start. Next, the process proceeds to a user authentication step (step S3 of the user authentication program PRG), and the microcomputer 21 performs user authentication.

  On the other hand, if the battery 5 is not in the open state as a result of the determination in the battery state determination step (step S1 of the user authentication program PRG), power can be supplied from the battery 5 to the anti-theft device 2, so that the user can immediately The process proceeds to an authentication process (step S3 of the user authentication program PRG), and the microcomputer 21 performs user authentication.

  Then, when the user authentication is completed, the process proceeds to a user authentication result determination step (step S4 of the user authentication program PRG), and the microcomputer 21 determines whether the user authentication has succeeded or failed.

  As a result of this determination, if the user authentication is successful, it is considered that the authorized user is trying to drive the motorcycle 1, and therefore the process proceeds to the engine ignition permission continuation step (step S5 of the user authentication program PRG). The microcomputer 21 continues the ON state of the output control circuit 26 and continuously permits engine ignition. Thereby, the authorized user can drive the motorcycle 1 as usual.

  On the other hand, if the result of determination in the user authentication result determination step (step S4 of the user authentication program PRG) is that user authentication has failed, it is considered that the person trying to drive the motorcycle 1 is not a legitimate user. The engine is stopped to prevent the motorcycle 1 from being stolen. At this time, when the engine rotation speed is higher than the safe stop speed Fe at the time when the user authentication is completed, the engine rotation speed is reduced to the safe stop speed Fe by the following procedure (steps S6 to S14 of the user authentication program PRG). Decrease gradually.

  First, in the first current engine speed reading step (step S6 of the user authentication program PRG), the microcomputer 21 detects and reads the current engine speed F0 based on the voltage waveform output from the rectifier regulator 3. The current engine speed F0 means the current engine speed and changes with time. That is, when the battery is opened, as shown in FIG. 3, a voltage waveform that is half-wave rectified by the rectifier regulator 3 is output and input to the input circuit 22 of the theft deterrent device 2 via the main switch 9. At this time, the number of voltage waveforms generated by one rotation of the engine is proportional to the number of poles of the AC magneto generator 4. For example, when the AC magneto generator 4 has 8 poles, a voltage waveform of 4 times is generated by one rotation of the engine, and when the AC magneto generator 4 has 6 poles, the voltage waveform of 3 times by one rotation of the engine. Will occur. Therefore, based on this proportional relationship, the microcomputer 21 calculates the engine rotation speed from the period T of this voltage waveform (the time from when the voltage exceeds the predetermined threshold voltage Vref until the next threshold voltage Vref), Is the current engine speed F0.

  Next, the process proceeds to a target engine speed setting step (step S7 of the user authentication program PRG), and the microcomputer 21 sets the current engine speed F0 as the target engine speed F1. This target engine speed F1 means the engine speed to be controlled, and changes with time.

  Thereafter, the process proceeds to a first current engine speed determination step (step S8 of the user authentication program PRG), and the microcomputer 21 reads the safe stop speed Fe, and whether or not the current engine speed F0 is equal to or less than the safe stop speed Fe. Determine.

  As a result of this determination, if the current engine speed F0 is equal to or lower than the safe stop speed Fe, it is considered safe even if the engine is stopped as it is, so the first engine ignition stop process (step S9 of the user authentication program PRG) The microcomputer 21 turns off the output control circuit 26 and stops engine ignition. As a result, it is possible to prevent the motorcycle 1 from being stolen while preventing the motorcycle 1 from overturning and stopping the motorcycle 1 safely.

  On the other hand, as a result of the determination in the first current engine speed determination step (step S8 of the user authentication program PRG), the current engine speed F0 is not less than or equal to the safe stop speed Fe (that is, the current engine speed F0 is not equal to the safe stop speed Fe). If the engine stops as it is, the motorcycle 1 may fall over, so the process proceeds to the second current engine speed determination step (step S10 of the user authentication program PRG). It is determined whether or not the current engine speed F0 is equal to or lower than the target engine speed F1.

  If the result of this determination is that the current engine speed F0 is less than or equal to the target engine speed F1, the routine proceeds to the engine ignition permission step (step S11 of the user authentication program PRG), and the microcomputer 21 turns on the output control circuit 26. Allow engine ignition.

  Thereafter, in the target engine rotation speed setting step (step S12 of the user authentication program PRG), the microcomputer 21 reads the differential rotation speed dF, subtracts the differential rotation speed dF from the current engine rotation speed F0, and calculates this difference as the target engine rotation speed. Let it be F1.

  Next, in the second current engine rotation speed reading step (step S13 of the user authentication program PRG), the microcomputer 21 performs the same procedure as the first current engine rotation speed reading step (step S6 of the user authentication program PRG) described above. Read the current engine speed F0.

  Next, the process returns to the first current engine speed determination step (step S8 of the user authentication program PRG), and the microcomputer 21 repeats the same operation.

  On the other hand, as a result of the determination in the second current engine speed determination step (step S10 of the user authentication program PRG), the current engine speed F0 is not less than or equal to the target engine speed F1 (that is, the current engine speed F0 is the target engine speed). If the speed exceeds F1), the process proceeds to the second engine ignition stop step (step S14 of the user authentication program PRG) in order to reduce the engine speed, and the microcomputer 21 temporarily turns the output control circuit 26 on. After turning off and temporarily stopping the engine ignition, the output control circuit 26 is turned on again.

  Thereafter, the process proceeds to the second current engine speed reading step (step S13 of the user authentication program PRG), and the microcomputer 21 thereafter repeats the same procedure (steps S8 to S14 of the user authentication program PRG).

  Then, the engine rotation speed is gradually decreased from the current engine rotation speed F0 by the difference rotation speed dF, and the engine is stopped when the engine rotation speed becomes equal to or less than the safe stop speed Fe.

  Here, the user authentication operation based on the user authentication program PRG ends.

  As described above, in the user authentication operation in the motorcycle 1, when user authentication fails as a result of user authentication, the engine is stopped when the engine rotation speed decreases and becomes the safe stop speed Fe or less. . Therefore, even if a person other than a legitimate user tilts the vehicle body and runs the motorcycle 1 at the time when the user authentication is completed, the motorcycle 1 is prevented from falling and the motorcycle 1 is stopped safely. The theft of the motorcycle 1 can be suppressed.

  In addition, at this time, since the engine rotation speed is decreased step by step by the differential rotation speed dF, it is possible to avoid a situation in which the engine rotation speed decreases suddenly and the motorcycle 1 suddenly stalls, thereby further improving safety. it can.

Further, since the rectifier regulator 3 which is an existing part can be effectively used to detect the engine rotation speed, it is not necessary to add a new part or wiring. Therefore, it is possible to avoid an increase in manufacturing cost due to an increase in the number of parts.
[Other Embodiments of the Invention]

  In the first embodiment described above, the case where the engine speed is detected using the voltage waveform output from the rectifier regulator 3 when the battery is opened has been described. However, as shown by a broken line in FIG. 1, an input circuit 23 is provided in the anti-theft device 2 and connected to the microcomputer 21, and the ignition timing signal of the pulsar generator 10 is sent to the anti-theft device 2 via the input circuit 23. The engine rotational speed may be detected by inputting.

  In this case, to detect the engine rotation speed, it is only necessary to add a wiring connecting the pulsar generator 10 which is an existing part and the input circuit 23, and it is not necessary to add a new part. Therefore, it is possible to avoid an increase in manufacturing cost due to an increase in the number of parts.

  In the above-described first embodiment, the case where the voltage waveform output from the AC magneto generator 4 is half-wave rectified by the rectifier regulator 3 has been described. However, when the engine speed is calculated based on this voltage waveform. If the threshold voltage Vref is appropriately determined, this voltage waveform can be full-wave rectified.

  Further, in the above-described first embodiment, the case where the idling rotation speed is set to the safe stop speed Fe has been described. However, the safe stop speed Fe is determined according to the running characteristics of the motorcycle 1 and the like. It is possible to set it independently.

  Furthermore, in the above-described first embodiment, the scooter type motorcycle 1 has been described, but it is needless to say that the present invention is similarly applied to a motorcycle 1 of a type other than the scooter type (for example, a saddle type). it can.

  The present invention can be widely applied to a theft deterrent device for deterring a theft act on a motorcycle, a three-wheeled vehicle, a four-wheeled vehicle or other vehicles.

1 is a block diagram of a motorcycle equipped with a theft deterrent device according to Embodiment 1 of the present invention. 4 is a flowchart showing a user authentication program according to the first embodiment. It is a time chart which shows the voltage waveform output from a rectifier regulator at the time of a battery open.

Explanation of symbols

1 …… Motorcycle (vehicle)
2 …… Theft deterrent device 3 …… Rectifier regulator 4 …… AC magneto generator 5 …… Battery 6 …… AC load 7 …… DC load 9 …… Main switch 10 …… Pulsar generator 11 …… Ignition unit 21 ... Microcomputer (engine monitoring means, engine deceleration means, engine stop means)
22, 23 …… Input circuit 25 …… AD conversion circuit 26 …… Output control circuit 27 …… Power supply circuit dF …… Differential rotation speed F0 …… Current engine rotation speed F1 …… Target engine rotation speed Fe …… Safe stop speed PRG …… User authentication program T …… Cycle Vref …… Threshold voltage

Claims (5)

A theft deterrent device configured to perform user authentication while the engine is rotating and to stop the engine when the user authentication fails,
Engine monitoring means for detecting the engine rotation speed of the engine;
When the user authentication is failed after the user authentication is completed, the engine rotation speed of the engine is gradually decreased when the engine rotation speed of the engine is higher than a predetermined safe stop speed when the user authentication is completed. Engine deceleration means for causing
An antitheft device comprising: engine stop means for stopping the engine when the engine rotation speed of the engine becomes equal to or less than the safe stop speed.   2. The theft deterrent device according to claim 1, wherein when the engine speed reduction means reduces the engine rotation speed of the engine, the engine speed reduction means gradually decreases the engine rotation speed by a predetermined differential rotation speed.   The antitheft device according to claim 1 or 2, wherein the safe stop speed is an idling rotation speed.   The antitheft device according to any one of claims 1 to 3, wherein the engine monitoring means detects an engine rotation speed of the engine based on a voltage waveform output from a rectifier regulator.   4. The antitheft device according to any one of claims 1 to 3, wherein the engine monitoring means detects an engine rotation speed of the engine by using an ignition timing signal output from a pulsar generator.

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