CN100576717C - Mirror apparatus for use in vehicles - Google Patents
Mirror apparatus for use in vehicles Download PDFInfo
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- CN100576717C CN100576717C CN200710140234A CN200710140234A CN100576717C CN 100576717 C CN100576717 C CN 100576717C CN 200710140234 A CN200710140234 A CN 200710140234A CN 200710140234 A CN200710140234 A CN 200710140234A CN 100576717 C CN100576717 C CN 100576717C
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Abstract
In this mirror apparatus for use in vehicles, drive unit (4) has: be used to drive body motor (421), detect the current detection circuit (414) of the electric current variance components that the rotation follow motor (421) produces and the switching circuit (412) that the ON/OFF state of the energising of motor (421) is switched.And when detecting the electric current variance components by current detection circuit (414), switching circuit (412) keeps the ON state constant, and when not detecting the electric current variance components, makes switching circuit (412) become the OFF state.Detect by the electric current variance components that the rotation of following motor is produced, judge the rotation status (whether motor is in the stall state) of motor, the ON/OFF state of switching circuit (energising of motor) is switched.Thus, have when the motor stall, can cut off the energising of motor rightly, the advantage of protection motor.
Description
Technical field
The present invention relates to a kind of mirror apparatus for use in vehicles, in more detail, relate to a kind ofly when the drive motor stall, can cut off the mirror apparatus for use in vehicles of the energising of motor rightly.
Background technology
In the mirror apparatus for use in vehicles that uses as the electronic gathering formula rearview mirror of vehicle etc., when holding up (during gathering) rearview mirror when rearview mirror is displaced to the cocked position (curling position) of regulation, exist this drive motor to become the stall state, and problem such as be damaged.Therefore, when the drive motor stall, need promptly cut off the energising of motor.
In relating to the existing mirror apparatus for use in vehicles of this problem, the technology of known record in patent documentation 1.Existing mirror apparatus for use in vehicles (mirror apparatus electromotor control circuit) is a kind of mirror apparatus electromotor control circuit that the motor that makes the rearview mirror displacement that is installed on the vehicle by actuating force is controlled of being used for, it is characterized by, have: the pulsation detection unit, its according to the interval of corresponding each regulation of rotating speed of the rotor of described motor, the pulsating current that produces in the drive current of described motor is detected; Identifying unit, its testing result according to described pulsation detection unit judges whether described rotor rotates; And switch element, it cuts off the electric current that described motor is supplied with according to the result of determination of described identifying unit when described rotor does not rotate.
[patent documentation 1] spy opens the 2005-306277 communique
Summary of the invention
The object of the present invention is to provide a kind ofly when the drive motor stall, can cut off the mirror apparatus for use in vehicles of the energising of motor rightly.
In order to reach above-mentioned purpose, mirror apparatus for use in vehicles of the present invention, comprise: be fixed on bottom on the vehicle, have mirror and the body that can install rotatably for the bottom and make the drive unit of described body for the rotation of described bottom, being characterized as of this mirror apparatus for use in vehicles: described drive unit has: the motor that is used to drive described body; The current detection circuit that the electric current variance components that the rotation of following described motor is produced detects; And the switching circuit that the ON/OFF state of the energising of described motor is switched, and when detecting the electric current variance components by described current detection circuit, described switching circuit keeps the ON state constant, and when not detecting this electric current variance components, making described switching circuit is the OFF state.
In this mirror apparatus for use in vehicles, follow the electric current variance components of the rotation generation of motor to judge the rotation status (whether motor is in the stall state) of motor by detection, come the ON/OFF state of switching circuit (energising of motor) is switched.Thus, just have when the stall of motor, cut off the energising of motor rightly, the advantage of protection motor.
In addition, in mirror apparatus for use in vehicles of the present invention, have timing circuit, it is given for the setting-up time that makes described switching circuit become the regulation of OFF state, and, when detecting the electric current variance components, described timing circuit is resetted by described current detection circuit.
In this mirror apparatus for use in vehicles, when detecting the electric current variance components, continue the timing circuit that resets by current detection circuit, keep the energising of motor.Therefore, the difference between current of the electric current of the electric current when rotating according to motor during with stall judges that the structure of the rotation status of motor compares, and has when the load instantaneous variation of motor, prevents the disconnected advantage of erroneous judgement of the rotation status of motor.
In addition, in the mirror apparatus for use in vehicles of this invention, described current detection circuit possesses the shunt resistance that is used to detect described electric current variance components, and described shunt resistance is made of semistor.
In this mirror apparatus for use in vehicles, the shunt resistance that is used to detect the electric current variance components is made of semistor, so compare with the structure that disposes shunt resistance and semistor respectively, even because the effect of semistor descends to the voltage that motor applies, the voltage that applies to control circuit also is difficult to change.Thus, the advantage that has the stable action of guaranteeing control circuit.
In addition, in the mirror apparatus for use in vehicles of this invention, disposing described current detection circuit that when rearview mirror draws in, uses and the described current detection circuit that when rearview mirror is holded up, uses respectively, the described current detection circuit that uses when rearview mirror draws in has the shunt resistance that is used to detect described electric current variance components, and the described current detection circuit that uses when rearview mirror is holded up has the structure of the shunt resistance that is used for detecting described electric current variance components, the diode that the shunt resistance of the described current detection circuit that has and use when rearview mirror draws in is connected in parallel, the diode that is connected in parallel with shunt resistance with the described current detection circuit that when rearview mirror is holded up, uses, and when a side described shunt resistance energising, the described diode cut-out that is connected with this shunt resistance to the energising of the opposing party's described shunt resistance.
In this mirror apparatus for use in vehicles, (when rearview mirror is holded up) only flows through electric current in a side shunt resistance when rearview mirror draws in, so compare with the structure that flows through electric current in both sides' shunt resistance, can reduce because the voltage that shunt resistance causes descends.Thus, has efficiently advantage to the motor service voltage.
In the mirror apparatus for use in vehicles of this invention, follow the electric current variance components of the rotation generation of motor to judge the rotation status (whether motor is in the stall state) of motor by detection, come the ON/OFF state of switching circuit (energising of motor) is switched.Thus, have when the stall of motor, cut off the energising of motor rightly, the advantage of protection motor.
Description of drawings
Fig. 1 is the pie graph of the mirror apparatus for use in vehicles of the expression embodiment of the invention.
Fig. 2 is the Action Specification figure of the mirror apparatus for use in vehicles of the expression embodiment of the invention.
Fig. 3 is the block diagram of drive unit of the mirror apparatus for use in vehicles of presentation graphs 1 record.
Fig. 4 is the circuit diagram of object lesson of control circuit of the drive unit of presentation graphs 3 record.
Fig. 5 is the chart of an example of the detection electric current of expression motor.
Fig. 6 is the key diagram of variation of the mirror apparatus for use in vehicles of presentation graphs 1 record.
Fig. 7 is the key diagram of variation of the mirror apparatus for use in vehicles of presentation graphs 1 record.
Fig. 8 is the key diagram of variation of the mirror apparatus for use in vehicles of presentation graphs 1 record.
Symbol description
1 mirror apparatus for use in vehicles, 2 bottoms, 3 bodies, 4 drive units, 10 power supplys, 31 mirror shells, 32 mirrors, 41 control circuits, 42 driving mechanisms, 411 drive circuits, 412 switching circuits, 413 timing circuits, 414 current detection circuits, 415 amplifying circuits, 421 motor
Embodiment
Below, with reference to accompanying drawing the present invention is described in detail.In addition, the present invention is not limited by this embodiment.In addition, in the inscape of this embodiment, comprise key element or the identical in fact key element that those skilled in the art can and replace easily.In addition, make up arbitrarily in the scope that a plurality of variation of record can those skilled in the art be known in this embodiment.
Fig. 1 and Fig. 2 are the structure chart (Fig. 1) and the Action Specification figure (Fig. 2) of the mirror apparatus for use in vehicles of the expression embodiment of the invention.Fig. 3 is the block diagram of drive unit of the mirror apparatus for use in vehicles of presentation graphs 1 record.Fig. 4 is the circuit diagram of object lesson of control circuit of the drive unit of presentation graphs 3 record.Fig. 5 is the chart of an example of the detection electric current of expression motor.Fig. 6～Fig. 8 is the key diagram of variation of the mirror apparatus for use in vehicles of presentation graphs 1 record.
[mirror apparatus for use in vehicles]
This vehicle mirror 1 for example uses (with reference to Fig. 1) as the electronic gathering formula rearview mirror (outside mirror) of vehicle.Mirror apparatus for use in vehicles 1 has: bottom 2, body 3 and drive unit 4.Bottom 2 is the parts that are fixed on the car door (omitting diagram).The mirror 32 that body 3 has mirror shell 31 and embeds this mirror shell 31 can be installed (with reference to Fig. 2) rotatably for bottom 2.Drive unit 4 is to be used to make the device of body 3 with respect to bottom 2 swing offsets, is accommodated in the mirror shell 31 that is configured in body 3.This drive unit 4 is made of control circuit 41 and driving mechanism 42.Control circuit 41 is the circuit that are used for controlling and driving mechanism 42, is connected with the power supply (DC power supply) 10 of vehicle.About this control circuit 41, will be described in detail with reference to accompanying drawing in the back.Driving mechanism 42 has: motor 421 and a plurality of gears (omitting diagram) that link with this motor 421.This driving mechanism 42 is delivered to body 3 via gear with the rotation of motor 421, makes body 3 be rotated displacement for bottom 2.
When using (holding up) rearview mirror,, body 3 is holded up the angle position (with reference to Fig. 2) of stipulating for the mirror 32 that the driver of vehicle can see body 3.And, when drawing rearview mirror in, by the switch drive drive unit 4 of operation vehicle both sides, body 3 picture folds into swing offset draw the curling position of stipulating in.In addition, when reusing rearview mirror, by the switch drive drive unit 4 of operation car both sides, body 3 is holded up the angle position of regulation from the curling position expansion.
[control circuit of drive unit]
The control circuit 41 of drive unit 4 has: drive circuit 411, switching circuit 412, timing circuit 413, current detection circuit 414 and amplifying circuit 415 (with reference to Fig. 3).Drive circuit 411 is the circuit that drive in order to make switching circuit 412 become the ON state.Switching circuit 412 is circuit that the ON/OFF state to the energising of motor 421 switches.Specifically, when switching circuit 412 was the ON state, motor 421 energisings were rotated (becoming the ON state), and when switching circuit 412 became the OFF state, the energising of motor 421 was cut off, and the rotation of motor 421 stops (becoming the OFF state).Timing circuit 413 is the circuit that are given for the setting-up time of the regulation that makes switching circuit 412 become the OFF state.Current detection circuit 414 is circuit that the electric current variance components (ripple component of motor current) that the rotation of following motor 421 produces is detected.Amplifying circuit 415 is to inputing to the circuit of timing circuit 413 after being amplified by current detection circuit 414 detected electric current variance components.In addition, about the object lesson of control circuit 41, will narrate in the back.
At this, when motor 421 rotation (when drawing in or holding up rearview mirror before motor 421 becomes the stall state), follow the rotation of motor 421 to produce the electric current variance components.On the other hand, when rearview mirror is displaced to the curling position or the cocked position of regulation, when motor 421 becomes the stall state, do not produce this electric current variance components.
For this, in this mirror apparatus for use in vehicles 1, the current detection circuit 414 of control circuit 41 when holding up rearview mirror (draw in or) when motor 421 energising detects the electric current variance components of generation all the time.And when detecting the electric current variance components, this signal is amplified by amplifying circuit 415, is input in the timing circuit 413 as the ON/OFF signal, and timing circuit (being used to make switching circuit 412 to become the setting-up time of the regulation of OFF state) continues to be reset.In addition, resetting of this timing circuit 413 carried out according to the time interval of the setting-up time that is shorter than timing circuit 413.Thus, switching circuit 412 keeps the ON state constant, and motor 421 continues rotation.
On the other hand, when motor 421 becomes the stall state, when detecting less than the electric current variance components, timing circuit 413 does not reset.So by this setting-up time of process, switching circuit 412 becomes the OFF state, the rotation that the energising of motor 421 is cut off motor 421 stops.Thus, remove the state that motor 421 is switched under the stall state, can suppress the damage (for example in the coil of motor 421, producing the state of affairs of bigger thermal stress) of motor 421.
As mentioned above, in the mirror apparatus for use in vehicles 1 of this invention, follow the electric current variance components of the rotation generation of motor 421 to judge the rotation status (whether motor 421 is in the stall state) of motor 421 by detection, come the ON/OFF state of switching circuit 412 (energising of motor 421) is switched.Thus, have when the stall of motor 421, cut off the energising of motor 421 rightly, the advantage of protection motor 421.
For example in existing mirror apparatus for use in vehicles, also have following structure: the difference between current of the electric current when electric current when rotating according to motor and stall, the rotation status of judgement motor switches (omitting diagram) to the ON/OFF state of switching circuit (energising of motor).But in this structure, since the above-mentioned difference between current of the specification of motor hour, existence can't be judged the problem of the rotation status of motor rightly.In this, this mirror apparatus for use in vehicles 1 is irrelevant with the size of the current value of motor 421, can judge on the rotation status this point of motor 421 comparatively desirable rightly.
In addition, this mirror apparatus for use in vehicles 1, for example, with merely only the structure of the conduction time of the regulation of the setting-up time by timing circuit motor (omitting diagram) compare ideal comparatively on can being reduced in the state of affairs this point that motor carries out unnecessary energising after becoming the stall state.
In addition, in this mirror apparatus for use in vehicles 1, as mentioned above, the timing circuit 413 that when detecting the electric current variance components, continues to reset, the energising that keeps motor 421 by current detection circuit 414.Therefore, for example, the difference between current of the electric current when electric current when rotating according to motor and stall judges that the structure (omitting diagram) of the rotation status of motor is compared, and has the disconnected advantage of erroneous judgement of the rotation status of the motor in the time of can preventing to have taken place to change in load moment of motor.
[object lesson of control circuit]
Fig. 4 represents the control circuit 41 of drive unit 4, and its structure and effect are described.In addition, in Fig. 4, when drawing (holding up) rearview mirror in, the last side line of control circuit 41 (line of the upside among Fig. 4) and power supply 10+utmost point is connected, following side line (line of the downside among Fig. 4) and power supply 10-utmost point is connected.On the other hand, when holding up (gathering) rearview mirror, become connection in contrast to this.At this, to the last side line of control circuit 41 and power supply 10+situation that the utmost point is connected describes.
At first, the drive circuit 411 of control circuit 41 comprises Zener diode ZD1 and resistance R 3 (Zener diode ZD2 and resistance R 3) and constitutes.When drawing (holding up) rearview mirror in, via these drive circuit 411 switching circuits 412 closures, motor 421 energisings drive.In addition, the Zener diode ZD by this drive circuit 411 makes switch element FET conducting.
In addition, the switching circuit 412 of control circuit 41 comprises switch element FET1 (switch element FET2) and constitutes.In this switching circuit 412, when switch element FET1 was the ON state, motor 421 energisings were rotated, and when switch element FET1 was the OFF state, the energising of motor 421 was cut off, and the rotation of motor 421 stops.Thus, the ON/OFF to the energising of motor 421 switches.
In addition, the timing circuit 413 of control circuit 41 comprises resistance R 4, capacitor C1, Zener diode ZD3 and transistor Tr 1 (resistance R 5, capacitor C2, Zener diode ZD4 and transistor Tr 2) and constitutes.In this timing circuit 413, when capacitor C1 was charged to setting voltage based on Zener diode ZD3, transistor Tr 1 became the ON state.So the switch element FET1 of switching circuit 412 becomes the OFF state, the energising of motor 421 is stopped, and the rotation of motor 421 stops.On the other hand, as described later, be reset and capacitor C1 is not charged under the state of setting voltage at timing circuit 413, keep the OFF state of transistor Tr 1, rotation is proceeded in electronic device 421 energisings.
In addition, the current detection circuit 414 of control circuit 41 comprises shunt resistance R1 and capacitor C3 (shunt resistance R2 and capacitor C4) and constitutes.This current detection circuit 414 obtains by shunt resistance R1 and capacitor C3 because the electric current variance components (with reference to Fig. 5) that the rotation of motor 421 produces, and is input in the amplifying circuit 415.
In addition, the amplifying circuit 415 of control circuit 41 comprises resistance R 10, resistance R 11 and transistor Tr 7 (resistance R 12, resistance R 13 and transistor Tr 8) and constitutes.This amplifying circuit 415 amplifies the electric current variance components of the motor 421 obtained by current detection circuit 414.In addition, the electric current variance components after the amplification is transfused to timing circuit 413 after being converted to the ON/OFF signal by transistor Tr 3 (Tr4).
When (when holding up) is connected control circuit 41 with power supply 10 when drawing rearview mirror in, via 421 energisings of 411 pairs of motor of drive circuit, motor 421 rotations.At this moment, on shown in Figure 4 survey line be+during the utmost point, electric current flows according to the order of internal body diodes, shunt resistance R2, motor 421, shunt resistance R1 and the switch element FET1 of switch element FET2, motor 421 energisings are rotated.When these motor 421 energisings, electric current flows into Zener diode ZD1 via resistance R 3, and switch element FET1 becomes the ON state.
When motor 421 rotations, generation electric current variance components in the waveform of its detection electric current (for example because the electric current that the variation of the relative position of magnets of stator and rotor coil causes variation and because the electric current variation that the optimizing phase switching causes) (with reference to Fig. 5), the current detection circuit 414 of control circuit 41 detects this electric current variance components.And, amplify by 415 pairs of detected electric current variance components of amplifying circuit, be converted to the ON/OFF signal by transistor Tr 3 (Tr4) and input to timing circuit 413.And when this ON/OFF signal was the ON state, the capacitor C1 (C2) of timing circuit 413 discharged, and timing circuit 413 is resetted.And, be not charged at continue to reset timing circuit 413 and capacitor C1 under the state of setting voltage of regulation, keep the OFF state of transistor Tr 1, it is constant that the switch element FET1 of switching circuit 412 continues as the ON state, and motor 421 continues rotation.
On the other hand, (body 3 is displaced to the cocked position or the curling position of regulation when motor 421 stalls, motor 421 is in the state of stall) because do not produce the electric current variance components of the rotation of following electronic device 421, be certain (constant current) so should detect the waveform of electric current.So, only be the OFF signal via the signal that transistor Tr 3 (Tr4) inputs to timing circuit 413 from current detection circuit 414.So capacitor C1 (C2) does not discharge and is charged to the setting voltage of regulation always.And when capacitor C1 was charged to setting voltage based on Zener diode ZD3, transistor Tr 1 became the ON state.Thus, the switch element FET1 of switching circuit 412 becomes the OFF state, and the energising of motor 421 is cut off, and motor 421 stops the rotation.
In addition, when the switch element FET1 of switching circuit 412 became the OFF state, the current potential of the shunt resistance R1 (R2) of drive circuit 411 rose sharp, and transistor Tr 5 (Tr6) becomes the ON state, and transistor Tr 3 (Tr4) is the OFF state by breech lock.
[variation 1]
As mentioned above, in this mirror apparatus for use in vehicles 1, control circuit 41 (current detection circuit 414) detects the electric current variance components (with reference to Fig. 5) of the rotation of following motor 421, judge motor 421 stall when not detecting this electric current variance components, switching circuit 412 becomes the OFF state.Thus, cut off the energising of motor 421, protection motor 421 prevents that it is subjected to the infringement of overcurrent.
But (1) is even this electric current variance components when the rotating speed of motor hangs down, produces as long as motor is rotated just.So, might be in that the load of motor be very high when having produced overcurrent, switching circuit still continues to keep the ON state constant, and motor is proceeded rotation.In addition.(2) even might be when switching circuit produces fault owing to certain is unusual, motor be still proceeded rotation.
Therefore, in this mirror apparatus for use in vehicles, prevent that in order to protect motor 421 it is subjected to the infringement of overcurrent, disposed semistor PTC (with reference to Fig. 4).This semistor PTC is connected in series for control circuit 41, when producing overcurrent, makes its resistance increase heating.Thus, alleviate the load of the motor 421 that causes by overcurrent, protection motor 421.
But, in above-mentioned structure, when semistor PTC performance function, the voltage that control circuit applies being reduced in this transitional period, it is unstable that the action of control circuit may become.
Therefore, in this mirror apparatus for use in vehicles 1, when control circuit 41 (current detection circuit 414) has the shunt resistance R1 (R2) of the electric current variance components that is used to detect motor 421, comparatively it is desirable to this shunt resistance R1 (R2) and constitute (with reference to Fig. 6) by semistor PTC1 (PTC2).For example, in structure shown in Figure 4, semistor PTC is connected in series for control circuit 41, but as shown in Figure 6, comparatively it is desirable to following structure: omit this semistor PTC, and shunt resistance R1 (R2) is replaced into semistor PTC1 (PCT2).
When motor start-up, detect the electric current variance components that the rotation owing to motor 421 produces via shunt resistance R1 (R2).And when detecting this electric current variance components, switching circuit 412 (switch element FET1) keeps the ON state constant, and motor 421 is proceeded rotation.On the other hand, when not detecting this electric current variance components, make switching circuit 412 become the OFF state, cut off the energising of motor 421, motor 421 stops the rotation.Thus, protection motor 421 prevents that it is subjected to the infringement of overcurrent.
In addition, when the load owing to motor 421 increased the rotating speed reduction of motor 421, the current value of motor 421 increased.So because the shunt resistance R1 (R2) of control circuit 41 is made of semistor PTC1 (PTC2), so this shunt resistance R1 (R2) heating, its resistance value increases.So the voltage that motor 421 is applied descends, motor 421 stops.So, do not produce the electric current variance components of the rotation of following motor 421, make switching circuit 412 become the OFF state, the energising of motor 421 is cut off.Thus, protection motor 421 prevents that it is subjected to the infringement of overcurrent.
In above-mentioned structure, the shunt resistance R1 (R2) that is used for the electric current variance components is detected is made of semistor PTC1 (PCT2), so compare with the structure (with reference to Fig. 4) that disposes shunt resistance R1 (R2) and semistor PTC respectively, even because the effect of semistor PTC1 (PTC2) (shunt resistance R1 (R2)) descends to the voltage that motor 421 applies, the voltage that control circuit 41 is applied also is difficult to change.Thus, the advantage that has the stable action that to guarantee control circuit 41.
[variation 2]
In addition, in the mirror apparatus for use in vehicles 1 of variation 1, the current detection circuit 414 that control circuit 41 uses when having the current detection circuit 414 that uses when drawing rearview mirror in and holding up rearview mirror, and dispose these current detection circuits 414,414 symmetrically and be connected (with reference to Fig. 6) with motor 421.And shunt resistance R1, the R2 of each current detection circuit 414 are made of semistor PTC1, PTC2 respectively.
In this structure, when motor 421 energisings, electric current flows into the both sides of these semistors PTC1, PTC2 (shunt resistance R1, R2).So when the current value of the rotating speed decline motor 421 of motor 421 had increased, Fa Re semistor PTC1, PTC2 played a role more already.So, dispose in the structure of semistor PTC1, PTC2 (shunt resistance R1, R2) the simple advantage that becomes of the design with control circuit 41 the both sides of the current detection circuit 414,414 of symmetry.
But, be not limited to this, can also only constitute the shunt resistance R1 (R2) (with reference to Fig. 7) of the side in the symmetrical current detection circuit 414,414 by semistor PTC1 (PTC2).Even in this structure, semistor PTC1 (PTC2) also can bring into play function rightly, can guarantee the stable action of control circuit 41.
[variation 3]
In addition, in above-mentioned mirror apparatus for use in vehicles 1, the current detection circuit 414 (with reference to Fig. 6) that has used when having disposed the current detection circuit 414 that uses when drawing rearview mirror in respectively and having holded up rearview mirror.In addition, the current detection circuit 414 that uses when drawing rearview mirror in has the shunt resistance R1 that is used to detect the electric current variance components, and in addition, the current detection circuit 414 that uses when holding up rearview mirror has the shunt resistance R2 that is used to detect the electric current variance components.
At this, in this structure, when mirror apparatus for use in vehicles 1 work, electric current flows into each shunt resistance R1, the R2 of control circuit 41 respectively.Therefore, produce pressure drop at each shunt resistance R1, R2, so, in the voltage that motor 421 is supplied with, can produce loss.
Therefore, in the mirror apparatus for use in vehicles 1 of this variation 3, the shunt resistance R1 of the current detection circuit 414 that uses when drawing rearview mirror in the diode D3 (with reference to Fig. 8) that is connected in parallel.In addition, the shunt resistance R2 of the current detection circuit 414 that uses when the holding up rearview mirror diode D4 that is connected in parallel.These diodes D3, D4 are configured to: when a side shunt resistance R1 energising, cut off the energising to the opposing party's shunt resistance R2.
For example, in control circuit shown in Figure 8 41, in the circuit that when drawing rearview mirror in, uses, the shunt resistance R1 of current detection circuit 414 and the switch element FET1 of switching circuit 412 are configured with being connected in series.And, for these shunt resistances R1 and the switch element FET1 diode D3 that is connected in parallel.Similarly, in the circuit that when holding up rearview mirror, uses, the shunt resistance R2 of current detection circuit 414 and the switch element FET2 of switching circuit 412 are configured with being connected in series.And, for these shunt resistances R2 and the switch element FET2 diode D4 that is connected in parallel.
In addition, the configuration direction setting of each diode D3, D4 is become: when a side shunt resistance R1 (R2) and switch element FET1 (FET2) energising, cut off energising to the opposing party's shunt resistance R2 (R1) and switch element FET2 (FET1).Therefore, when drawing in or holding up rearview mirror, can not appear at the situation of streaming current among both sides' shunt resistance R1, the R2.
In this structure, (when holding up rearview mirror) streaming current in a side shunt resistance R1 (R2) only when drawing rearview mirror in, so compare with the structure (with reference to Fig. 6) of streaming current in shunt resistance R1, R2 both sides, can reduce because the voltage that shunt resistance R1, R2 cause descends.Thus, have can be efficiently to the advantage of motor 421 service voltages.
In addition, in above-mentioned structure, it is desirable to, the shunt resistance R1 (R2) of current detection circuit 414 constitutes (with reference to Fig. 8) by semistor PTC1 (PTC2).If adopt this structure, then, has the advantage of the stable action of guaranteeing control circuit 41 by the function of semistor PTC1 (PTC2).
(utilization on the industry)
As mentioned above, mirror apparatus for use in vehicles of the present invention can be appropriate when the drive motor stall Useful on the energising this point of ground cut-out motor.
Claims (2)
1. mirror apparatus for use in vehicles, it comprises: is fixed on bottom on the vehicle, has mirror and the body that can install rotatably for the bottom and make the drive unit of described body, it is characterized in that for the rotation of described bottom,
Described drive unit has: the motor that is used to drive described body; The current detection circuit that the electric current variance components that the rotation of following described motor is produced detects; And the switching circuit that the ON/OFF state of the energising of described motor is switched;
And when detecting the electric current variance components by described current detection circuit, described switching circuit keeps the ON state constant, simultaneously, when not detecting this electric current variance components, makes described switching circuit become the OFF state;
Described mirror apparatus for use in vehicles also has timing circuit, and described timing circuit is given for the setting-up time that makes described switching circuit become the regulation of OFF state; And, when detecting the electric current variance components, described timing circuit is resetted by described current detection circuit.
2. mirror apparatus for use in vehicles according to claim 1 is characterized in that,
In the structure that is configured in described current detection circuit that uses when rearview mirror draws in and the described current detection circuit that when rearview mirror is holded up, uses respectively, the described current detection circuit that uses when rearview mirror draws in has the shunt resistance that is used to detect described electric current variance components, simultaneously, the described current detection circuit that uses when rearview mirror is holded up has the shunt resistance that is used to detect described electric current variance components
Described structure also has: the diode that is connected in parallel with the shunt resistance of the described current detection circuit that uses when rearview mirror draws in; The diode that is connected in parallel with shunt resistance with the described current detection circuit that when rearview mirror is holded up, uses; And, when a side described shunt resistance energising, the described diode cut-out that is connected with this opposing party's shunt resistance to the energising of the opposing party's described shunt resistance.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006239035 | 2006-09-04 | ||
| JP2006239035 | 2006-09-04 | ||
| JP2007111885 | 2007-04-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101141104A CN101141104A (en) | 2008-03-12 |
| CN100576717C true CN100576717C (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710140234A Expired - Fee Related CN100576717C (en) | 2006-09-04 | 2007-08-06 | Mirror apparatus for use in vehicles |
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| CN (1) | CN100576717C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116153A (en) * | 2018-08-16 | 2019-01-01 | 杭州容大智造科技有限公司 | A kind of device and method detecting outside rear-view mirror for vehicle |
| CN111619453B (en) * | 2019-02-27 | 2022-02-25 | 广州汽车集团股份有限公司 | Rearview mirror control method and device |
| CN112519684B (en) * | 2020-12-16 | 2022-11-29 | 上海欧菲智能车联科技有限公司 | Method and device for adjusting exterior rearview mirror, storage medium and electronic equipment |
| CN112776681A (en) * | 2021-02-02 | 2021-05-11 | 一汽奔腾轿车有限公司 | Method and device for judging motor stalling of passenger car seat |
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2007
- 2007-08-06 CN CN200710140234A patent/CN100576717C/en not_active Expired - Fee Related
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| CN101141104A (en) | 2008-03-12 |
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