JP4940981B2 - Vehicle steering lock device - Google Patents

Description

  According to the present invention, a steering member is selectively switched between a locked state and an unlocked state by drivingly engaging and disengaging a lock member with an electric actuator with respect to an engaged portion that rotates together with a steering shaft of a vehicle. The present invention relates to a locking device.

  In a vehicle such as an automobile, an engaged part that rotates together with the steering shaft, a lock member that engages / disengages the engaged part and selectively switches the steering shaft between a locked state and an unlocked state, and engages / disengages the lock member An antitheft steering lock device (see, for example, Patent Document 1) including an electric actuator for driving and a drive control unit for driving and controlling the electric actuator is well known.

  Here, for example, a push button type engine starter that starts the engine without using a general mechanical key is well known, and in a steering lock system including such an engine starter and the steering lock device, When the engine control unit connected to the vehicle-mounted unit of the keyless entry device receives a predetermined engine start command, the engine is started after the steering lock device is switched to the unlocked steering shaft in the unlocked state. It is configured.

In the steering lock device, usually, the engaged portion is formed of an engagement recess opening outward in the radial direction of the steering shaft, and the lock member is driven to move in the radial direction by the electric actuator and is engaged with and disengaged from the engagement recess. Is done.
JP 2005-313773 A

  In the steering lock device, when the steering shaft is in a locked state, when the turning force acts on the steering shaft and the lock member engaged with the engaged portion is twisted, the lock member is covered. When the engagement portion is strongly engaged, when the locked steering shaft is switched to the unlocked state, the lock member is pulled out from the engaged portion even if the lock member is driven by the electric actuator. There is a possibility that the engagement cannot be released.

  Therefore, when driving the electric actuator, it is conceivable to set the driving voltage supplied to the electric actuator high in advance and to set the driving voltage supply time long in advance. There arises a problem that damage or failure due to heat generation of the actuator is likely to occur, and deterioration of the electric actuator is easily promoted.

  It is an object of the present invention to reliably disengage the lock member from the engaged portion when switching the locked steering shaft to the unlocked state, and this keeps the drive voltage supplied to the electric actuator unnecessarily high. It is another object of the present invention to provide a steering lock device for a vehicle that can be achieved without excessively extending the drive voltage supply time (unlock time).

  According to another aspect of the present invention, there is provided a steering lock device for a vehicle, wherein the lock member selectively engages / disengages with an engaged portion that rotates together with the steering shaft of the vehicle to switch the steering shaft between a locked state and an unlocked state. In a vehicle steering lock device including an electric actuator for engaging and disengaging the electric actuator and a drive control means for driving and controlling the electric actuator, the drive control means includes a drive circuit for driving the electric actuator, and the drive Voltage control means for variably controlling the drive voltage supplied to the electric actuator via the circuit, and the voltage control means starts when the drive voltage is supplied when the locked steering shaft is switched to the unlocked state. Until a predetermined time elapses, a predetermined first voltage and a second voltage higher than the first voltage are Supplying a pulsed driving voltage to each other output, after a predetermined time has elapsed and supplying a lower driving voltage than the second voltage.

  In this vehicle steering lock device, the lock member is engaged with the engaged portion, the steering shaft is locked, the lock member is disengaged from the engaged portion, and the steering shaft is unlocked. Become. The electric actuator is driven and controlled by the drive control means, and the lock member is engaged with and disengaged from the engaged portion by the electric actuator. In this drive control means, the drive voltage supplied to the electric actuator is variably controlled by the voltage control means via a drive circuit for driving the electric actuator.

When the steering shaft in the locked state is switched to the unlocked state, the voltage control means generates a predetermined first voltage and a second voltage higher than the first voltage from the start of supplying the driving voltage until a predetermined time has elapsed. Since the pulsed drive voltage that is output alternately is supplied to the electric actuator, the impact effect that the output of the electric actuator repeats high and low is exerted on the lock member, and the lock member is disengaged from the engaged portion. For example, by making the second voltage higher than the normal drive voltage, the impact effect is enhanced, and when the steering shaft is in the locked state, the lock member is strongly engaged with the engaged portion. Even when the lock member is engaged, the lock member is reliably released from the engaged portion.
In addition, since the drive voltage lower than the second voltage is supplied by the voltage control means after a predetermined time has elapsed, the effect of being able to disengage the lock member from the engaged portion is unnecessary for the drive voltage supplied to the electric actuator. This is achieved without continuing to supply the pulsed drive voltage including the second voltage to be increased to a high level.

Here, the following configuration can be adopted as a dependent claim of claim 1.
The driving voltage after the lapse of the predetermined time is the first voltage. The electric actuator includes an electric motor. The voltage control unit stops the supply of the drive voltage after a set time from the start of supply of the drive voltage.

  According to the vehicle steering lock device of the first aspect, the lock member is engaged and disengaged by the electric actuator with respect to the engaged portion that rotates together with the steering shaft, and the steering shaft is brought into the locked state and the unlocked state. In particular, the drive control means for driving and controlling the electric actuator variably controls the drive circuit for driving the electric actuator and the drive voltage supplied to the electric actuator via this drive circuit. Voltage control means, and when the voltage control means switches the steering shaft in the locked state to the unlocked state, the predetermined first voltage and the first voltage from the start of supply of the drive voltage until a predetermined time elapses. Supply a pulsed drive voltage that alternately outputs a high second voltage to the electric actuator. Supplying a lower driving voltage than the serial second voltage.

  Therefore, when the steering shaft is in a locked state, even if the lock member is strongly engaged with the engaged portion, a pulsed drive voltage is supplied to the electric actuator, and the output of the electric actuator repeats high and low. The effect is exerted on the lock member, and the engagement release operation from the engaged portion of the lock member is promoted, that is, the lock member can be reliably released from the engaged portion. Can be increased.

  The voltage control means supplies the pulsed drive voltage from the start of supplying the drive voltage until the lapse of a predetermined time, and supplies the drive voltage lower than the second voltage after the lapse of the predetermined time. The impact effect of repeatedly changing the output is exerted on the lock member, so that the lock member can be reliably and quickly disengaged from the engaged portion, and after the pulsed drive voltage is supplied to the electric actuator, the second Since the drive voltage lower than the voltage is supplied, the effect of being able to reliably disengage the lock member from the engaged portion is obtained, and the pulsed drive voltage including the second voltage that unnecessarily increases the drive voltage supplied to the electric actuator is provided. This can be achieved without continuing the supply, and therefore it is possible to reliably suppress the occurrence of damage, failure, and deterioration of the electric actuator due to heat generation of the electric actuator.

  According to the vehicle steering lock device of the second aspect, since the driving voltage after the predetermined time has elapsed is the first voltage, it is possible to reliably promote damage to the electric actuator due to heat generation, failure, and deterioration of the electric actuator. Can be suppressed.

  According to the steering lock device for a vehicle of the third aspect, since the electric actuator is an electric motor, the driving voltage for reliably engaging / disengaging the lock member with respect to the engaged portion by the electric motor and supplying the electric motor to the electric motor is provided. By raising the value, the output of the electric motor can be reliably raised.

  According to the vehicle steering lock device of the fourth aspect, since the voltage control means stops the supply of the drive voltage after a set time from the start of the supply of the drive voltage, the supply time (lock) of the drive voltage supplied to the electric actuator It is possible to prevent the release time) from being excessively long, and to more reliably suppress the damage caused by the heat generation of the electric actuator, the occurrence of a failure, and the promotion of the deterioration of the electric actuator.

  In the vehicle steering lock device of the present invention, the lock member is engaged and disengaged by the electric actuator with respect to the engaged portion that rotates together with the steering shaft, and the steering shaft is selectively set to the locked state or the unlocked state. A drive control means for driving and controlling the electric actuator, a drive circuit for driving the electric actuator, and a voltage control means for variably controlling the drive voltage supplied to the electric actuator via the drive circuit; It is equipped with.

  As shown in FIG. 1, a steering lock device 1 for a vehicle is engaged with and disengaged from an engaged portion 3 that rotates together with a steering shaft 2 of a vehicle steering system, and the steering shaft 2 is selectively set to a locked state or an unlocked state. A lock member 4 for switching to the engagement member, an engagement / disengagement drive mechanism 5 having an electric motor 6 which is an electric actuator for engaging / disengaging the lock member 4, and a drive control device 7 which is a drive control means for driving and controlling the electric motor 6. ing.

  The engaged portion 3 is composed of one or a plurality of engaging recesses 3 opened to the outer periphery of the steering shaft 2 in the radial direction. The lock member 4 is driven to move in the radial direction by the engagement / disengagement drive mechanism 5 and is engaged. The engagement member 3 is engaged and disengaged, the lock member 4 is engaged with the engaged portion 3, the steering shaft 2 is locked, the lock member 4 is disengaged from the engaged portion 3, and the steering shaft 2 is unlocked. The engagement / disengagement drive mechanism 5 may have a mechanism such as a gear that transmits the output of the electric motor 6 to the lock member 4.

  The drive control device 7 is a drive circuit 8 (driver 8) for driving the electric motor 6, and a voltage for controlling the drive circuit 8 and variably controlling the drive voltage V supplied to the electric motor 6 via the drive circuit 8. And a control unit 9 as control means. Electric power is supplied to the drive circuit 8 from the battery 15, and electric power is supplied from the drive circuit 8 to the electric motor 6.

  The control unit 9 includes a CPU 9a, a ROM 9b, and a RAM 9c. For example, although not illustrated, the control unit 9 is electrically connected to the vehicle-mounted unit of the keyless entry device, and is connected to the vehicle-mounted unit of the keyless entry device. When a predetermined engine start command (for example, operation of a push button switch) is received, an unlock command is output to the control unit 9, and the control unit 9 receives the unlock command and engages the lock member 4 The drive control is performed via the drive circuit 8 and the engagement / disengagement drive mechanism 5 so as to release the engagement from the part 3, and the keyless entry device detects that the steering shaft 2 is switched from the unlocked state to the locked state, Start the engine.

  As shown in FIG. 2, when the locked steering shaft 2 is switched to the unlocked state, that is, when the lock member 4 is disengaged from the engaged portion 3, the drive motor 7 drives the electric motor 6. In the case of control, from the start of driving of the electric motor 6, the electric motor 6 is supplied with the normal first voltage V1 (for example, V1 = 5V) and the second voltage V2 (for example, V2 = 12V) higher than the first voltage V1. ) And a pulsed drive voltage PV that is alternately output.

  Here, the pulse-like drive voltage PV first outputs the second voltage V2, and then switches alternately between the first voltage V1 and the second voltage V2, for example, every about 0.17 seconds. . In addition, as shown in FIG. 3, it is good also as the pulsed drive voltage PV which makes the 1st voltage V1 0V.

  Then, in a state where the pulsed drive voltage PV is supplied to the electric motor 6, a set time Te (for example, Te = 2 seconds) has elapsed since the start of supplying the drive voltage V (pulsed drive voltage PV) to the electric motor 6. Then, supply of the drive voltage V to the electric motor 6 is stopped, and the lock member 4 is disengaged from the engaged portion 3 during that time.

  The control executed by the control unit 9 for realizing the above operation is as shown in the flowchart of FIG. That is, when this control is started, first, the timer t is started (S1), and then the drive circuit 8 is controlled to supply the pulsed drive voltage PV to the electric motor 6 (S2). Then, it is determined whether or not t = Te (S3). If S3; No, the process returns to S2, the pulsed drive voltage PV is continuously supplied to the electric motor 6, and if S3; Yes, the drive circuit 8 is turned on. As a result, the supply of the drive voltage V to the electric motor 6 is stopped (S4), and the process ends.

  According to the steering lock device 1 described above, the drive control device 7 that drives and controls the electric motor 6 supplies the drive circuit 8 for driving the electric motor 6 and the electric motor 6 via the drive circuit 8. A control unit 9 that variably controls the drive voltage V. When the control unit 9 switches the steering shaft 2 in the locked state to the unlocked state, a predetermined first voltage V1 and a first voltage V higher than the first voltage V The pulsed drive voltage P output alternately with the two voltages V2 is supplied to the electric motor 6.

  Therefore, even when the locking member 4 is strongly engaged with the engaged portion 3 when the steering shaft 2 is in the locked state, the pulsed driving voltage PV is supplied to the electric motor 6 to Until the lock member 4 exhibits an impact effect of repeated output, the lock member 4 is disengaged from the engaged portion 3 until the set time Te elapses from the start of driving of the electric motor 6. Since the pulsed drive voltage PV is continuously supplied to the electric motor 6, the lock member 4 can be reliably and quickly disengaged from the engaged portion 3, so that the operation reliability can be improved. Here, the output of the electric motor 6 is reliably increased by reliably driving the lock member 4 to and from the engaged portion 3 by the electric motor 6 and increasing the drive voltage V supplied to the electric motor 6. Can be made.

  In addition, since the control unit 9 stops the supply of the drive voltage V after the set time Te from the start of the supply of the drive voltage V (pulse drive voltage PV), the lock member 4 is reliably engaged from the engaged portion 3. The effect that can be released can be achieved without excessively increasing the supply time (lock release time) of the drive voltage V supplied to the electric motor 6. 6 can be reliably suppressed.

  In the second embodiment, the operation and control performed by the drive control device 7 and the control unit 9 of the first embodiment are changed. As shown in FIG. 5, when the electric motor 6 is driven and controlled by the drive control device 7 when the steering shaft 2 in the locked state is switched to the unlocked state, first, the pulsed driving voltage PV is supplied to the electric motor 6. .

  Next, after a predetermined time T1 (for example, T1 = 1 second) from the start of supply of the drive voltage V to the electric motor 6, the drive voltage V1 is supplied to the electric motor 6 and the output of the electric motor 6 is set to a normal output. . Next, after a set time Te (for example, Te = 2 seconds) longer than a predetermined time T1 from the start of supply of the drive voltage V to the electric motor 6, the electric motor 6 is stopped from supplying the drive voltage V.

  The control executed by the control unit 9 for realizing the above operation is as shown in the flowchart of FIG. That is, when this control is started, the timer t is first started (S10), then the drive circuit 8 is controlled, and the pulsed drive voltage PV is supplied to the electric motor 6 (S11). Then, it is determined whether or not t = T1 (S12). If S12; No, the process returns to S11, and the pulsed drive voltage PV is continuously supplied to the electric motor 6.

  S12: If Yes, the drive circuit 8 is controlled and the drive voltage V1 is supplied to the electric motor 6 (S13). Next, it is determined whether t = Te (S14). If S14; The driving voltage V supplied to the electric motor 6 is maintained at the driving voltage V1. S14: In the case of Yes, the drive circuit 8 is controlled, the supply of the drive voltage V to the electric motor 6 is stopped (S15), and the process ends.

  According to this steering lock device 1, the control unit 9 supplies the pulsed drive voltage PV to the electric motor 6 from the start of supply of the drive voltage V to the elapse of the predetermined time T1, and after the elapse of the predetermined time T1, the second voltage is supplied. Since the drive voltage (first voltage V1) lower than V2 is supplied, the impact effect of repeating the output from the beginning of driving of the electric motor 6 is exerted on the lock member 4, and the lock member 4 is engaged. The engagement can be reliably and quickly released from the portion 3.

  Moreover, since the first voltage V1 lower than the second voltage V2 is supplied after the pulsed drive voltage PV is supplied to the electric motor 6, it is possible to reliably disengage the lock member 4 from the engaged portion 3. This can be achieved without continuing to supply the pulsed drive voltage PV including the second voltage V2 that unnecessarily increases the drive voltage V supplied to the electric motor 6. Therefore, the electric motor 6 is damaged due to heat generation or the like, The promotion of deterioration of the electric motor 6 can be suppressed more reliably.

  As shown in FIG. 7, the control unit 9 compares the time when the first and second voltages V1 and V2 are alternately switched from the start of supplying the drive voltage V to the electric motor 6 until the predetermined time T1 elapses. After the predetermined time T1 has elapsed, the pulse drive voltage PVb having a longer switching time than the time of the pulse drive voltage PVa is switched after the predetermined time T1 has elapsed. You may make it supply.

  As shown in FIG. 8, the steering lock device 1 </ b> A includes the steering lock device 1 according to the first embodiment that includes a current value detection circuit 10 that is a current value detection unit that detects a drive current value I of the electric motor 6. The current value I detected by the current value detection circuit 10 is input to the control unit 9. The control unit 9 is electrically connected to the display device 16 and is configured to be able to control the display device 16 directly or indirectly. The display device 16 includes, for example, a display lamp dedicated to the steering lock device 1, a display common to the steering lock device 1 and other devices, and the like.

  As shown in FIGS. 9A, 10A, and 11A, when the steering shaft 2 in the locked state is switched to the unlocked state, that is, when the lock member 4 is disengaged from the engaged portion 3. When the drive control device 7 controls the drive of the electric motor 6, first, a normal drive voltage V1 (for example, V1 = 5V) is first supplied to the electric motor 6, and the output of the electric motor 6 is set to a normal output at the start of driving. To.

  Here, FIGS. 9-1, 10-1, and 11-1 show the drive voltage V supplied to the electric motor 6 by the drive control device 7, and FIGS. 9-2, 10-2, and 11- 2 indicates the drive current value I of the electric motor 6 detected by the current value detection circuit 10. FIGS. 9A and 9B show FIGS. 10-1 and FIGS. 11-1 and 11-2 when the electric motor 6 is driven from the state where the lock member 4 is not strongly engaged with the engaged portion 3. FIGS. These show the case where the electric motor 6 is driven from the state in which the lock member 4 is strongly engaged with the engaged portion 3.

  Here, when the lock member 4 is strongly engaged with the engaged portion 3, the lock member 4 is engaged even when the electric motor 6 is driven at a normal drive voltage V1 (for example, V1 = 5V). When the engagement is not released from the joint portion 3 or is difficult to release, the electric motor 6 is overloaded, but as a drive current value of the electric motor 6, a predetermined current at which the electric motor 6 is overloaded. The value I1 (for example, I1 = 8A) is set in advance experimentally, for example.

  As shown in FIGS. 9A and 9B, when the lock member 4 is not strongly engaged with the engaged portion 3, first, when the drive voltage V1 is supplied to the electric motor 6, the current value detection circuit 10 The detected drive current value I becomes less than a predetermined current value I1 (for example, 1A), and in this state, when a set time Te (for example, Te = 2 seconds) elapses from the start of supplying the drive voltage V1 to the electric motor 6. Then, the electric motor 6 is stopped from being supplied with the drive voltage V1, and during that time, the lock member 4 is disengaged from the engaged portion 3.

  As shown in FIGS. 10-1, 2 and 11-1, 1, in the state where the lock member 4 is strongly engaged with the engaged portion 3, first, when the drive voltage V1 is supplied to the electric motor 6. The drive current value I detected by the current value detection circuit 10 becomes equal to or greater than a predetermined current value I1 (for example, 10A), and this state is maintained for a certain time T1 (for example, from the start of supplying the drive voltage V1 to the electric motor 6) , T1 = 0.3 seconds), the electric motor 6 is then supplied with a normal first voltage V1 (for example, V1 = 5V) and a second voltage V2 (for example, V2 = 12V) higher than the first voltage V1. ) And a pulsed drive voltage PV that is alternately output.

  Here, when the pulsed drive voltage PV is supplied to the electric motor 6, for example, the drive current value I of the electric motor 6 corresponding to the first voltage V1 is about 10A, and the electric motor corresponding to the second voltage V2 is used. The drive current value I of 6 is about 20A.

  Next, as shown in FIGS. 10A and 10B, the drive current value I detected by the current value detection circuit 10 becomes equal to or greater than a predetermined current value I1, and in this state, the drive voltage V (pulse When the set time Te has elapsed from the start of supply of the drive voltage PV), the electric motor 6 is stopped from supplying the drive voltage V2, and during that time, there is a high possibility that the lock member 4 will not be disengaged from the engaged portion 3. .

  On the other hand, as shown in FIGS. 11-1 and 11-2, the drive current value I detected by the current value detection circuit 10 becomes equal to or greater than the predetermined current value I1, and thereafter, the supply of the drive voltage V to the electric motor 6 is started. If the drive current value I (the drive current value I corresponding to the first voltage V) detected by the current value detection circuit 10 becomes less than the predetermined current value I1 before the set time Te elapses, then the electric motor 6 The drive voltage V1 is supplied, the output of the electric motor 6 is set to a normal output, and when the set time Te has elapsed since the start of the supply of the drive voltage V to the electric motor 6, the supply of the drive voltage V to the electric motor 6 is stopped. In addition, the possibility that the lock member 4 is disengaged from the engaged portion 3 is increased.

  The control executed by the control unit 9 for realizing the above operation is as shown in the flowchart of FIG. That is, when this control is started, the timer t is first started (S20), then the drive circuit 8 is controlled to supply the drive voltage V1 to the electric motor 6 (S21), and then The drive current value I detected by the current value detection circuit 10 is read (S22).

  Next, it is determined whether or not the drive current value I read in S22 is equal to or greater than the predetermined current value I1 (S23). If S23; No, the drive voltage V1 is continuously supplied to the electric motor 6 (S24). T = Te is determined (S25). If S25; No, the process returns to S24, and the drive voltage V supplied to the electric motor 6 is maintained at the drive voltage V1, and if S25; Yes, the drive is performed. The circuit 8 is controlled, the supply of the drive voltage V to the electric motor 6 is stopped (S30), and the process ends.

  On the other hand, if S23; Yes, it is determined whether or not t = T1 (S26). If S26; No, the process returns to S21. If S23; Yes, the drive voltage V supplied to the electric motor 6 is When the drive voltage V1 is maintained and S26; Yes, the drive circuit 8 is controlled, and the pulsed drive voltage PV is supplied to the electric motor 6 (S27). Next, it is determined whether or not t = Te (S28). If S28; No, the process returns to S23. If S23; Yes, S26; Yes, the pulsed drive voltage PV is supplied to the electric motor 6. I can continue.

  Thereafter, when S28; Yes, an alarm (failure display) is performed by the display device 16 (S29), and then the drive circuit 8 is controlled to stop the supply of the drive voltage V to the electric motor 6. (S30), the process ends. Thereafter, when S28; No, when S23; No, the drive circuit 8 is controlled to supply the drive voltage V1 to the electric motor 6 (S24), and then it is determined whether t = Te. If (S25) and S25; Yes, the drive circuit 8 is controlled, the supply of the drive voltage V to the electric motor 6 is stopped (S30), and the process ends.

  According to the steering lock device 1A described above, when the lock member 4 is not strongly engaged with the engaged portion 3, the drive current value I detected by the current value detection circuit 10 is less than the predetermined current value I1. Therefore, the electric motor 6 can be driven with a low output, and the lock member 4 can be disengaged from the engaged portion 3. Even if the electric motor 3 is driven with the pulsed drive voltage PV, the current value detection circuit As soon as the drive current value I detected in 10 becomes less than the predetermined current value I1, the drive voltage V supplied to the electric motor 6 is switched from the pulse-like drive voltage PV to V1, so that the lock member 4 is moved from the engaged portion 3. The effect of reliably releasing the engagement can be achieved without continuously supplying the pulsed drive voltage PV including the second voltage V2 that unnecessarily increases the drive voltage V supplied to the electric motor 6.

  Note that T1, Te, V1, and V2 can be changed as appropriate. In addition, various electric actuators such as a solenoid actuator can be applied instead of the electric motor 6, and various structures can be applied to the engaged portion 3, the lock member 4, and the engagement / disengagement drive mechanism 5. . For the pulsed drive voltage PV, the switching time of the first and second voltages V1, V2 can be set as appropriate, and the supply time of the first, second voltages V1, V2 is made different (for example, from the first voltage V1). Also, the supply time of the second drive voltage V2 may be lengthened). In addition, various modifications can be added without departing from the spirit of the present invention. The present invention is suitable for vehicles such as automobiles, but can be applied to various vehicles such as other motorcycles.

It is a block diagram of the steering lock device of Example 1. It is a time chart of the operation | movement which a drive control apparatus performs. It is a time chart of the process which a control unit performs. It is a flowchart of the process which a control unit performs. 6 is a time chart of operations performed by the drive control device of Embodiment 2. It is a flowchart of the process which the control unit of Example 2 performs. It is a block diagram of the steering lock device of a modification . It is a block diagram of the steering lock equipment of Example 3. 10 is a time chart of operations performed by the drive control apparatus of Embodiment 3. It is a time chart which shows the drive current value of an electric motor. 10 is a time chart of operations performed by the drive control apparatus of Embodiment 3. It is a time chart which shows the drive current value of an electric motor. It is a flowchart of the process which the control unit of Example 3 performs. It is a time chart which shows the drive current value of an electric motor. It is a flowchart of the process which the control unit of Example 3 performs.

1, 1A Steering lock device 2 Steering shaft 3 Engaged portion 4 Lock member 6 Electric motor 7 Drive control device 8 Drive circuit 9 Control unit

Claims (4)

A lock member that selectively engages and disengages a steering shaft with a steering shaft of a vehicle to selectively switch the steering shaft between a locked state and an unlocked state; an electric actuator that engages and disengages the lock member; In a steering lock device for a vehicle provided with drive control means for driving and controlling an actuator,
The drive control means includes a drive circuit for driving the electric actuator, and a voltage control means for variably controlling a drive voltage supplied to the electric actuator via the drive circuit,
When the voltage control means switches the steering shaft in the locked state to the unlocked state, a predetermined first voltage and a second voltage higher than the first voltage are generated from the start of supply of the driving voltage until the lapse of a predetermined time. Supplying a pulsed drive voltage to be output alternately, and supplying a drive voltage lower than the second voltage after a predetermined time has elapsed;
A steering lock device for a vehicle. Steering lock apparatus for a vehicle according to claim 1, the driving voltage after the lapse of the predetermined time, wherein the first voltage der Rukoto. Steering lock apparatus for a vehicle according to claim 1 or 2, the electric actuator characterized Rukoto such from the electric motor. It said voltage control means, the supply start time after the set time of the driving voltage, the steering lock device for a vehicle according to any one of claims 1 to 3, wherein the Rukoto stops the supply of the drive voltage.