JP3152604B2 - Key lock device and key lock solenoid control device for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a key lock device for locking an engine key in an automatic vehicle.

[0002]

2. Description of the Related Art An automatic vehicle employs a key interlock mechanism for inhibiting rotation of an engine key and removal of a key when a shift lever is located at a position other than parking (P). Therefore, this mechanism prevents a malfunction such as starting the engine while the shift lever is in the drive (D) position.

As shown in FIG. 3, the conventional key interlock mechanism includes a key lock solenoid 10 which is energized to inhibit rotation and pulling out of an engine key, and a control circuit 26 which controls the energization of the key lock solenoid 10. Has a basic configuration. And this control circuit 26
Controls the power supply to the key lock solenoid 10 in accordance with the operation of an ignition switch (IGSW) 12 and a parking detection switch 14.

In FIG. 3, an emitter of a transistor Tr11 and a base of the transistor Tr11 are connected to a high-voltage power supply line 20 via a resistor R19. One end of a thermal fuse F11 is connected to the collector of the transistor Tr11. The other end of the thermal fuse F11 is connected to one end of the key lock solenoid 10 via the emitter-collector of the transistor Tr12, and the resistor R20 and the fuse F12
Is also connected to one end of the key lock solenoid 10.

The transistor Tr13 has an emitter connected to the base of the transistor Tr12, a base connected to the emitter via a resistor R15, a resistor R17 and a diode D1.
9 is connected to the capacitor C12.

Further, a collector of the transistor Tr14 is connected to an emitter of the transistor Tr13 via a diode D15. This transistor Tr14
Is connected to the high-voltage power supply line 20, the base is connected to the capacitor C11, and is connected between the resistor R11 and the Zener diode ZD10.

The key lock solenoid 10 is mounted on a key cylinder disposed near the steering of the vehicle, and is connected to a control circuit 26 disposed in the shift lever device of the vehicle by a covered conductor. When assembling the insulated wire or due to the deterioration of the insulated wire over time,
The coated conductor may be short-circuited. Therefore, the transistor Tr1 that controls the key lock solenoid 10
A thermal fuse F11 is provided in the immediate vicinity of 1. When an excessive current flows through the transistor Tr11 due to such a short circuit of the coated conductor and the transistor Tr11 abnormally generates heat, the thermal fuse F11 detects this and operates to cut off the circuit. A configuration is employed.

In the above configuration, first, when an engine key is inserted into a key cylinder and the key is turned by a predetermined amount, an ignition switch (IGSW) 12 is switched to an accessory (ACC) position (including an ON position). , The high-voltage power supply line 20 of the control circuit 26
It is connected to a power supply 18 such as a vehicle-mounted battery via the SW 12.

When the shift lever is at a position other than the P position and the parking detection switch 14 detects this and closes the key lock switch P2, the low voltage power supply line 22 of the control circuit 26 is connected to a predetermined low voltage power supply. (GND in the figure).

When the two switches 12 and 14 operate as described above, current is supplied from the power supply 18 to the high voltage power supply line 20 via the diode D11, and the transistors Tr11, Tr12 and Tr13 are turned on.
Therefore, the key lock solenoid 10 is connected via the transistor Tr11, the fuse F11 and the transistor Tr12.
Is energized. Thereby, the key lock solenoid 10
Then, as shown in FIG. 4, a starting (sucking) voltage corresponding to the power supply voltage VB is generated, and the plunger provided in the key cylinder is attracted to the key lock solenoid 10, and, for example, the lock pin is Rotation and pull-out of the engine key are prevented by contacting the cam of the key cylinder.

The transistor Tr13 is on during the period from the start of energization to the key lock solenoid 10 to the time when the capacitor C12 connected to the base thereof is being charged, but turns off when the capacitor C12 is charged. In response, the transistor Tr12 is also turned off. On the other hand, since a voltage corresponding to the resistance ratio between the resistors R19 and R21 is applied to the base of the transistor Tr11,
If the power supply voltage VB is within the normal range, the transistor T
It is on regardless of the off of r12.

Therefore, when the transistor Tr12 is turned off, a current is supplied from the transistor Tr11 to the key lock solenoid 10 through the resistor R20 and the fuse F12, and a holding voltage as shown in FIG. , The key lock operation is maintained. Note that the resistor R20 is a cement resistor, and has a function of reducing the voltage applied to the key lock solenoid to some extent when the power supply voltage VB is, for example, 11.5 V or more.

The voltage of the power supply 18 is low, for example, 11.5 V
In the following cases, the transistor Tr14 which is turned on when the voltage is high is turned off, and the diode D15 connected to the collector of the transistor Tr14 operates. Therefore, the transistor Tr is connected via the diode D15 and the resistor R13.
A current flows from the base of the power supply 12 toward the low-voltage power supply line 22, the transistor Tr12 is turned on, and the key lock solenoid 10 is energized. Thus, as described above, the plunger is attracted to the key lock solenoid 10 and the key lock operation is performed.

[0014]

However, in the conventional control circuit 26, when the power supply voltage VB of the power supply 18 fluctuates as shown in FIG.
11 operates, the current supplied to the key lock solenoid 10 fluctuates.

Therefore, when the power supply voltage VB rises and the output voltage of the key lock solenoid 10 exceeds a predetermined value,
There is a possibility that the suction force of the key lock solenoid 10 becomes large and the tapping sound at the time of suction of the plunger becomes large, giving the driver of the vehicle an uncomfortable feeling. Further, there is a possibility that the amount of electricity supplied to the key lock solenoid 10 is increased to generate heat, and the heat is transmitted to the engine key, and the engine key becomes hot.

Further, since the conventional control circuit 26 switches between the attraction voltage of the key lock solenoid 10 and the holding voltage by using a resistor, the number of parts is large, the circuit configuration is complicated, and a large installation space is required. I need.

The present invention has been made to solve these problems, and can maintain the output voltage of the key lock solenoid within a certain range even if the power supply voltage fluctuates, with a simple configuration. It is an object to provide a key lock device.

[0018]

In order to achieve the above object, a key lock device for a vehicle according to the present invention has the following features.

That is, a key lock solenoid that is energized according to the operation of both the ignition switch and the parking detection switch and locks an engine key, a power supply line connected to a power supply when the ignition switch moves to a predetermined position, A switch element connected to the power supply line for controlling current supply from the power supply line to the key lock solenoid in accordance with a voltage applied to a control electrode; and detecting that a shift lever of the automatic vehicle is at a position other than the parking position. The parking detection switch that connects the control electrode of the switch element to the power supply line, and operates when a voltage supplied to the control electrode of the switch element becomes equal to or higher than a predetermined value. A constant voltage element that holds
Having.

The key lock solenoid control device for locking the engine key controls the energization of the key lock solenoid in accordance with the operation of both the ignition switch and the parking detection switch, and has the following configuration. Features.

That is, a power supply line connected to a power supply when the ignition switch moves to a predetermined position, and a switch element provided between the power supply line and the key lock solenoid. The power supply line is connected to the control electrode, a switch element for controlling current supply from the power supply line to the key lock solenoid according to a voltage applied to the control electrode, and a switch element connected to the control electrode of the switch element. A constant-voltage element that operates when the voltage at the control electrode becomes equal to or higher than a certain value and holds the voltage at the control electrode at or below a certain value.

Further, in the above device, the constant voltage element may be constituted by a Zener diode.

In the above configuration, when the power supply voltage fluctuates to a predetermined value or more, the constant voltage element operates to maintain the voltage applied to the control electrode of the switch element at a constant value or less. You. Therefore, even if the power supply voltage fluctuates, the current supplied to the key lock solenoid does not increase based on the control of the switch element, and it is possible to prevent an excessive current from flowing through the key lock solenoid to generate heat. Also,
Since the output voltage of the key lock solenoid is limited to a certain value or less, even if the power supply voltage VB increases, the suction force of the key lock solenoid increases in accordance with this, and the plunger suction for locking the engine key occurs. The problem of a loud hitting sound does not occur.

Further, according to the above configuration, the current supplied to the key lock solenoid is not switched between the power supply start period (key lock activation period) and the power supply maintenance period (key lock holding period) to the key lock solenoid. Therefore, a configuration for switching is unnecessary, the number of parts is reduced, the size of the control circuit can be reduced, and the manufacturing efficiency can be improved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a key lock device for a vehicle according to an embodiment of the present invention will be described below with reference to the drawings. Note that the same reference numerals are given to portions corresponding to the drawings described above, and description thereof will be omitted.

[Structure of key lock device] In FIG.
The anode side of the diode D1 is connected to the ACC position (including the ON position) of the ignition switch (IGSW) 12 via a cigarette lighter fuse.

The high voltage power supply line 20 is connected to a collector of a transistor Tr2 (an npn transistor in this embodiment). The emitter of the transistor Tr2 is connected via a fuse F1 to one end of a key lock solenoid 10 whose other end is grounded. The cathode of the diode D2 is connected to the connection point between the fuse F1 and the key lock solenoid 10, and the fuse F
This prevents a current from flowing from 1 to the low-voltage power supply line 22.

A base, which is a control electrode of the transistor Tr2, is connected to the collector of the transistor Tr2 via a capacitor C1, and is connected to a parking detection switch 1 via a resistor R2.
4 is connected to the key lock switch P2. Therefore, the base of the transistor Tr2 is connected to the cathode of the diode D1, that is, the high-voltage power supply line 20, when the switch P2 is closed.

Between the base of the transistor Tr2 and the low-voltage power supply line 22, a resistor R1 and a Zener diode ZD1 as a constant voltage element are provided. For example, the Zener diode ZD1 operates when the voltage of the power supply 18 increases and the voltage applied to the base of the transistor Tr2 increases and exceeds a predetermined breakdown voltage value. Then, a reverse current flows from the base of the transistor Tr2 toward the low-voltage (ground in the figure) power supply line 22, and the transistor T2
The control is performed so that the base voltage of r2 is within a predetermined value.

[Operation of Key Lock Device] When an engine key is inserted into a key cylinder and turned from a LOCK position to an ACC position (or an ON position), the IGSW 12 is turned on.
When the vehicle is connected to the C position (or the IGON position) and the parking detection switch 14 detects that the shift lever of the vehicle is in the [D, R, 2, 1] position other than the parking (P), the key lock is performed. When the switch P2 is closed, the base of the transistor Tr2 is connected to the high voltage power supply line 20. Accordingly, the transistor T
A current is supplied to the base of r2 via the resistor R2, and the transistor Tr2 turns on. When the transistor Tr2 is turned on, the high voltage power supply line 20
Through the collector-emitter of r2 and the fuse F1,
A current is supplied to the key lock solenoid 10. Therefore, the key lock solenoid 10 responds to this current by
As in the prior art, the plunger is suctioned and held, and rotation of the engine key (for example, rotation of the key cylinder from the ACC position to the LOCK position) and pulling out of the key are prohibited.

Next, the relationship between the power supply voltage VB and the voltage applied to the key lock solenoid 10 when the key lock control circuit 16 of the present embodiment is used will be described with reference to FIGS. In FIG. 2, the vertical axis represents the output voltage of the key lock solenoid, and the horizontal axis represents the power supply voltage VB.

As described above, the IGSW 12 shown in FIG.
When the switch reaches the position C (or ON) and the switch P2 of the parking detection switch 14 is closed, a voltage corresponding to the power supply voltage VB is applied to the base of the transistor Tr2. Here, when the power supply voltage VB is, for example, 10.5 V or less, the Zener diode ZD1 does not operate, and the transistor Tr2 controls the current supplied to the key lock solenoid 10 according to the power supply voltage VB. Accordingly, in this range (about 9 to 10.5 V of the power supply voltage VB), the output voltage of the key lock solenoid 10 becomes the power supply voltage VB as shown in FIG.
For example, it changes in the range of 7.5 V to 9 V according to B.

On the other hand, when the power supply voltage VB is higher than 10.5 V, a voltage higher than the breakdown voltage is applied to the Zener diode ZD1, and the Zener diode ZD1
1 causes a reverse current to flow. Therefore, the power supply voltage VB 10.5
When the voltage is equal to or higher than V, the base voltage of the transistor Tr2 is kept constant regardless of the power supply voltage VB, and the current supplied to the key lock solenoid 10 does not change. Therefore, the output voltage of the key lock solenoid becomes a constant value (for example, 9 V). That is, even if the power supply voltage VB becomes higher than a predetermined value, the current supplied to the key lock solenoid does not increase, so that the key lock solenoid 10 does not generate abnormal heat, and the tapping sound during plunger suction increases. Does not occur.

As shown in FIG. 2, the suction voltage (starting voltage) required when the key lock solenoid 10 is energized to suction the plunger is, for example, 7.5V to 11V.
It is about. On the other hand, when the power supply voltage VB is in the range of 9V to 16V, the output voltage of the key lock solenoid of the present embodiment is 7.5V to 9V, which is within the required range of the above-mentioned attraction voltage.

On the other hand, the holding voltage required to hold the key lock is, for example, about 6 V to 9.5 V. Therefore, the output voltage of the key lock solenoid of the present embodiment also satisfies the required value of the holding voltage.

Further, in the configuration of the present embodiment, the voltage applied to the key lock solenoid is the same in the suction period and the holding period because the key lock solenoid, the suction voltage, and the holding voltage are not switched as in the related art. . Therefore, a sufficiently high voltage can be applied to the key lock solenoid 10 even during the holding period as in the case of suction. Since the key lock solenoid, the suction voltage, and the holding voltage are not switched, a configuration for switching is unnecessary, and
The number of components of the control circuit can be greatly reduced.

[Function of Fuse F1] Next, the function of the fuse F1 of this embodiment will be described.

As is conventionally known, the control circuit of the key lock solenoid is often arranged together with the shift lever control circuit in the shift lever device of an automatic vehicle. The temperature of the shift lever device may increase due to heat generated by the exhaust muffler of the engine. The temperature also changes depending on the outside air temperature. For this reason, the temperature of the printed circuit board on which the key lock solenoid control circuit arranged in the shift lever device is mounted also changes. In the conventional circuit configuration shown in FIG. 3, the fuse F11 is a thermal fuse. When an excessive current flows through the transistor Tr11 and the transistor Tr11 generates abnormal heat, the fuse is detected and the circuit is cut off.

However, since the temperature of the printed circuit board changes as described above, it is difficult to keep the temperature of the fuse F11 constant. For this reason, in the conventional configuration, the fuse F1
The operation timing of 1 may vary depending on the temperature of the printed circuit board, and the key lock solenoid 10 and the transistor Tr11 may not be properly protected. Further, the fuse F11 is connected to the transistor Tr11.
Therefore, it is difficult to assemble, for example, the operator must manually attach the fuse F11, and there is a problem that the manufacturing efficiency is low.

On the other hand, in the present embodiment, FIG.
Transistor Tr2 and key lock solenoid 10 shown in FIG.
Is provided between the current fuse (I
C protector), which operates when an excessive current flows through the transistor Tr2 to cut off the circuit. Therefore, the fuse F1 can appropriately protect the key lock solenoid 10 and the control circuit 16 without being affected by a change in the temperature of the printed circuit board in the shift lever device as in the related art. Further, since it is not necessary to assemble the fuse F1 in close contact with the transistor Tr2, the manufacturing efficiency of the control circuit 16 is further improved.

[Shift Lock Device with Key Interlock] In an automatic vehicle, a key interlock function is added to the shift lock device, and a so-called shift lock device with key interlock is often configured. In accordance with the key interlock function described above, this shift lock device with a key interlock operates so that the shift lever cannot be moved from the P (parking) position unless the brake pedal is depressed (shift lock), and the shift lever malfunctions. And a device for preventing malfunction of the engine key.

Therefore, when the key interlock function of the present embodiment having the above-described configuration is added to the shift lock device, the shift lock device can adopt, for example, the following configuration.

In FIG. 1, a power source 18 includes a stop switch 30 which is turned on when a vehicle brake pedal is depressed.
Is connected via a stop fuse.
A stop lamp 32 is connected to the other end of the stop switch 30. In addition, stop fuse
A resistor and a capacitor are connected in this order in parallel with the stop switch 30, and the current flowing through the fuse is averaged.

A shift lock switch P1 of the parking detection switch 14 is further connected to the other end of the stop switch 30. Further, resistors R4 and R5 are provided between the other end of the shift lock switch P1 and the low voltage power supply line 22, and a connection point between the resistors R4 and R5 is connected to the npn-type transistor Tr1. The base is connected. The shift lock switch P1 is
When the shift lever is at the P position, the shift lever closes, whereby a desired voltage is applied to the base of the transistor Tr1 to turn on the transistor Tr1.

The emitter of the transistor Tr1 is connected to the low-voltage power supply line 22.
The other end of the shift lock solenoid 34 is connected to one collector via a diode D4 provided in a direction in which a current flows toward the collector.

One end of the shift lock solenoid 34 is
The IGSW 12 is connected to the ON position of the IGSW 12 via a gauge fuse. When the IGSW 12 is switched to the ON position, the power supply 1 is connected to one end of the shift lock solenoid 34.
8 is connected. A diode D3 for regenerating a current temporarily flowing through the shift lock solenoid 34 is connected between both ends of the shift lock solenoid 34.

In the above configuration, the IGSW1
2 is turned on, the brake pedal is depressed, the stop switch 30 is closed, and furthermore, only when the shift lever is at the P position and the shift lock switch P1 is closed, a predetermined voltage is applied to the base of the transistor Tr1. , The transistor Tr1 turns on. As a result, the shift lock solenoid 34 is energized, the shift lock is released, and the shift lever can be moved from the P position to another shift position.

If a shift lock device with a key interlock is constructed by combining the shift lock device having such a configuration with the key lock device according to the above-described embodiment, both the shift lock solenoid and the key lock solenoid control circuit can be simplified. With such a configuration, the number of parts is small and the production of these control circuits becomes easy. Further, since the circuit can be miniaturized, the degree of freedom in arranging the circuit in the shift lever device is high, and the mounting to the shift lever device becomes easy. Note that the configuration of the control circuit is not limited to the above configuration.

[0049]

As described above, according to the key lock device of the present invention, by using the constant voltage element, the voltage can be applied to the control electrode of the switch element even if the power supply voltage fluctuates with a simple configuration. The voltage can be kept below a certain value. For this reason, even if the power supply voltage fluctuates, the voltage applied to the key lock solenoid can be limited to a certain value or less based on the control of the switch element. Therefore, it is possible to prevent an excessive current from flowing through the key lock solenoid to generate heat, thereby preventing the problem that the tapping sound during plunger suction increases.

[Brief description of the drawings]

FIG. 1 is a schematic circuit configuration diagram showing a key lock device for a vehicle according to an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a power supply voltage VB and an output voltage of a key lock solenoid according to the embodiment of the present invention.

FIG. 3 is a schematic circuit configuration diagram showing a conventional vehicle key lock device.

FIG. 4 shows a power supply voltage VB in a conventional key lock device.
FIG. 3 is a diagram showing a relationship between the output voltage of a key lock solenoid.

[Explanation of symbols]

10 key lock solenoid, 12 ignition switch, 14 parking detection switch, 16 key lock solenoid control circuit, 18 power supply, 20 high voltage power line, 22 low voltage power line, 30 stop switch, 32 stop lamp, 34 shift lock solenoid.

Continuation of the front page (56) References JP-A-7-329716 (JP, A) JP-A-2-136483 (JP, A) JP-A-3-107767 (JP, A) JP-A-2-3560 (JP) , A) Hikaru 1-147765 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 25/00-25/10

Claims (3)

(57) [Claims] A key lock solenoid that is energized according to the operation of both an ignition switch and a parking detection switch to lock an engine key; a power supply line connected to a power supply when the ignition switch moves to a predetermined position; A switch element that is connected to the power supply line and controls current supply from the power supply line to the key lock solenoid according to a voltage applied to a control electrode; and detects that a shift lever of the automatic vehicle is at a position other than the parking position. The parking detection switch that connects the control electrode of the switch element to the power supply line, and operates when a voltage supplied to the control electrode of the switch element becomes equal to or higher than a predetermined value. And a constant-voltage element for maintaining a constant value or less. Vehicle of key locking device to be. 2. A control device for a key lock solenoid, which is energized according to the operation of both an ignition switch and a parking detection switch and locks an engine key, wherein the control device is connected to a power supply when the ignition switch moves to a predetermined position. A power supply line, a switch element provided between the power supply line and the key lock solenoid, wherein the power supply line is connected to the control electrode by the parking detection switch, and a voltage applied to the control electrode. A switch element for controlling a current supply from the power supply line to the key lock solenoid in accordance with the control element; and a switch element connected to the control electrode of the switch element. And a constant voltage element that holds the voltage at or below a certain value. Key lock solenoid control device comprising and. 3. A key lock device and a key lock solenoid control device for a vehicle according to claim 1, wherein the constant voltage element is a Zener diode.