JPH0158299B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention provides an electronic lock for an automobile that unlocks the door when a serial signal generated by operating a door handle of the automobile matches a predetermined coded signal. It is related to.

Prior Art and Problems Car doors are locked by operating a key from the outside, a lock button from the inside, a lock switch on the driver's seat, etc., and it is difficult to lock the door while leaving the key inside the car. In this case, you will not be able to open the door. Furthermore, the same problem occurs when the key is lost, and the user is no longer able to use the vehicle.

In order to overcome these drawbacks, an electronic lock for automobiles as shown in FIG. 1 has been proposed. In the figure, 1 is a door handle, 2 is a switch, 3 is a door lock section consisting of an electromagnetic solenoid, etc., 4 is a signal receiving section, 5 is a decoding processing section, and 6 is an unlocking drive section.

In the door lock section 3, an electromagnetic solenoid is energized for a short time by operation of a lock switch on the driver's seat or by a detection signal of a traveling speed higher than a predetermined speed, thereby locking the door. It has a configuration in which it is possible to release the lock by excitation in the reverse direction for a short time, and the lock release operation is performed by the output of the lock release drive section 6. By operating the handle 1, the switch 2 is turned on or off, and the on/off signals are applied to the signal receiving section 4, subjected to processing such as level conversion, etc., and then applied to the decoding processing section 5. The decode processing unit 5 decodes the on/off serial signal,
It is determined whether or not it is a predetermined encrypted signal, and when it is determined that it is an encrypted signal, a control signal is applied to the unlocking drive section 6 to drive the door locking section 3 to release the lock.

In this way, the electronic lock for a car shown in Fig. 1 can be unlocked by operating the handle 1 and applying a coded signal to the signal receiving section 4. Even if the door is locked while inside the car or the key is lost, the door lock can be released.

By the way, when such electronic locks for automobiles are actually applied, it is necessary to prevent the door lock from automatically releasing due to malfunction of the device, etc.
Although this is absolutely necessary from the standpoint of safety, the device shown in FIG. 1 did not take this point into consideration.

OBJECTS OF THE INVENTION The present invention has been made to improve the above-mentioned drawbacks, and its purpose is to prevent the door lock from spontaneously releasing due to malfunction. Examples will be described in detail below.

Embodiment of the Invention FIG. 2 is a block diagram of an embodiment of the invention, in which SW is a switch that is turned on and off by operating the door handle, D1 to D3 are diodes, and R1 and R
2, R3 is a resistor, C is a capacitor, RE is a relay,
Re is a relay contact, COM is a comparator, BZ is a buzzer, and the same symbols as in other figures in FIG. 1 represent the same parts.

The door lock section 3, signal reception section 4, decode processing section 5, and lock release drive section 6 are connected to the relay from the power supply B2.
It is operated by the operating voltage applied through the contact re of the RE, but normally the contact re is off as shown in the figure, so it is in a non-operating state.
Now, in order to release the door lock, when you operate the door handle and turn on the switch SW, the operating voltage is supplied from the power supply B1 to the comparator COM via the resistor R1, switch SW, and diode D1, and also,
A charging current is supplied to the capacitor C via the resistor R1, the switch SW, the diode D2, and the resistor R2. The comparator COM compares the voltage appearing across the capacitor C with a threshold value, and when the terminal voltage of the capacitor C rises to the threshold value, it supplies operating current to the relay RE and turns on its contact re. As a result, from the power supply B2 to each part of the device 3 to 6 and the comparator
Operating voltage is supplied to COM via contact re, and buzzer BZ sounds to notify that each part of the device 3 to 6 is in an operating state. Then, by operating the door handle, the switch SW is turned on and off, and a predetermined coded signal is applied to the signal receiving section 4, so that each section 3 to 6 of the device operates in the same manner as described above. This will release the door lock.

In this case, the discharge circuit consisting of the resistor R3 and the capacitor C maintains the terminal voltage of the capacitor C at a level higher than the threshold value while applying the coded signal to the signal receiving section 4 by turning the switch SW on and off. By setting the discharge time constant in this way, the contact re will automatically turn off after the door lock is released, and the device will shut off. Since each part 3 to 6 is in a non-operating state, there is no fear that the door lock will be released due to malfunction of the device while the vehicle is running.
Further, since the operating voltage is supplied to each part of the device 3 to 6 only when the door lock is released, there is no need to worry about the battery running out while the vehicle is parked. Furthermore, since the buzzer sounds when the door handle is operated, a crime prevention effect can be desired.

Effects of the Invention As explained above, the present invention compares a switch that is turned on and off by operating a door handle of a car, a serial signal caused by turning on and off the switch, and a predetermined coded signal, A detection means for detecting an operation of the door handle in an electronic automobile lock comprising a determination means for outputting a control signal when the two match, and a door lock release driving means for releasing the door lock based on the control signal. and operating power supply means for supplying operating power to the determining means and the door lock release driving means while the detecting means detects that the door handle is being operated. There is no possibility that the lock will be released due to malfunction, which has the advantage of improving safety.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional example, and FIG. 2 is a block diagram of an embodiment of the present invention. 1 is a handle, 2, SW is a switch, 3 is a door lock section, 4 is a signal receiving section, 5 is a decoding processing section, 6
is the lock release drive unit, R1, R2, R3 are resistors,
D1 to D3 are diodes, C is a capacitor,
COM is a comparator, RE is a relay, re is a contact, and BZ is a buzzer.

Claims (1)

[Claims] 1. A switch that is turned on and off by operating the handle of a car door, and a determination means that compares the serial signal generated by turning on and off the switch with a predetermined coded signal, and outputs a control signal when the two match. and a door lock release driving means for releasing the door lock in response to the control signal, a detection means for detecting an operation of the door handle, and a door handle operated by the detection means. 1. An electronic lock for an automobile, comprising operating power supply means for supplying operating power to the determining means and the door lock release drive means while the door lock is detected to be closed.