JP6266381B2 - Electric brake device - Google Patents

Description

  The present invention relates to an electric brake device, and more particularly to a technique for reducing the size of a device by making a power supply system redundant.

Conventionally, the following are proposed as an electric brake device.
1. By depressing the brake pedal, the rotational motion of the motor is converted into a linear motion via a linear motion mechanism, and the braking force is applied by pressing the brake pad against the brake disc (Patent Document 1).
2. An electric linear actuator using a planetary roller screw mechanism has been proposed (Patent Document 2).

JP-A-6-327190 JP 2006-194356 A

  In the techniques 1 and 2, it is necessary to electrically connect the sprung and unsprung parts of the vehicle on which the electric brake device is mounted with a harness for supplying power. In this case, durability (bending, vibration, etc.) of the harness becomes a problem.

  In the case of a vehicle that generates braking force only with an electric brake device, even if an abnormality occurs in the power supply device, the vehicle can travel over a certain distance (for example, the distance to the nearest vehicle repair shop, etc.). In order to do so, it may be necessary to maintain at least part of the braking function of the electric brake device. Therefore, the configuration of the redundant system when an abnormality occurs mainly in the power supply apparatus becomes a problem. For example, it is necessary to multiplex power supply devices, to provide two power sources for an electric brake device, or to install a mechanical brake device separately, and in any case, this may increase manufacturing costs and space. There is sex.

  An object of the present invention is to provide an electric brake device capable of reducing the size of the device while making the power supply system redundant.

The electric brake device according to the present invention includes an electric motor 2, a brake member 7 that applies a braking force to a vehicle wheel 45, a transmission mechanism 4 that converts the rotational motion of the electric motor 2 into an operation of the brake member 7, In the electric brake device including the control device 9 for controlling the electric motor 2,
A dedicated backup power supply 32 having a storage capacity capable of driving the electric motor 2;
A power generation device 33 for converting a part of the kinetic energy during travel of the vehicle into electric energy and charging the backup power supply device 32;
The control device 9 drives the electric motor 2 by the backup power supply device 32 when the electric power of the main power supply device 31 that is constantly supplying electric power to the electric motor 2 does not reach a predetermined standard. Features.
The “predetermined standard” is determined based on, for example, results of experiments and simulations.
The “main power supply device” may use, for example, a power window driven at a low voltage in a vehicle, an auxiliary battery for driving an auxiliary device such as an air conditioner, or an electric motor different from the auxiliary battery. A battery dedicated to the brake device may be applied.

  According to this configuration, when the driver of the vehicle operates the brake operation means 39 at all times, the control device 9 drives the electric motor 2 by the main power supply device 31. The rotational movement of the electric motor 2 is converted into the operation of the brake member 7 by the transmission mechanism 4. As a result, the braking force is applied to the vehicle by the brake member 7 imparting frictional resistance to the wheel 45 of the vehicle. Further, when the vehicle is traveling, the power generation device 33 converts a part of kinetic energy during traveling of the vehicle into electric energy and charges the backup power supply device 32.

  For example, when the power of the main power supply device 31 does not reach a predetermined standard due to an abnormality occurring in the main power supply device 31, the control device 9 uses the charged backup power supply device 32 to drive the electric motor 2. Drive. Thus, even when an abnormality occurs in the main power supply device or the like, the electric motor 2 can be driven using the dedicated backup power supply device 32. As a result, a traveling distance of a certain distance or more, for example, a distance to the nearest vehicle repair shop or the like can be traveled.

  As the electric power for driving the vehicle driving motor, for example, several kW to several tens of kW of electric power is required, but the electric power for driving the electric motor 2 of the electric brake device is, for example, several W and that of the vehicle driving motor. It is much smaller than the driving power. Then, the rated output of the backup power supply device 32 can be reduced by reducing the storage capacity of the backup power supply device 32 on the basis of the electric power that can stop the running vehicle at least once. Small size is enough. For this reason, space saving of the entire electric brake device can be achieved while achieving redundancy of the power supply system. Further, since the brake function is maintained by making the power supply system of the electric brake device redundant, the structure can be simplified and the manufacturing cost can be reduced as compared with the case where a mechanical brake is separately installed. Although power generation by the power generation device 33 results in energy loss, since the power that can stop the vehicle at least once is about several watts as described above, the energy loss due to the power generation device 33 does not affect the fuel consumption of the vehicle.

The control device 9
A power diagnosis function unit 41a for judging whether or not the current power supply capability is insufficient with respect to the power supply capability when the main power supply device 31 is in a normal state,
When the power supply diagnosis function unit 41a determines that the power supply capability is insufficient, the backup power supply device 32 supplements the insufficient power and uses the power auxiliary function unit 41b used as power for the electric brake device. It may be included.

  In this case, the power supply diagnosis function unit 41a of the control device 9 detects the power of the main power supply device 31, and determines whether or not the detected power Pm is greater than or equal to the threshold value P, for example. The threshold value P is electric power at which the power supplied from the main power supply device 31 to the electric brake device is determined to be normal, and is determined from results of experiments, simulations, and the like, for example. When it is determined that the power Pm is equal to or greater than the threshold value P, for example, the power auxiliary function unit 41b supplies power from the main power supply device 31 to the electric brake device. When it is determined that the power Pm is less than the threshold value P, for example, the power assist function unit 41b supplements the insufficient power with the backup power supply device 32 and uses it as power for the electric brake device.

The control device 9
Determination means 37a for determining whether or not the state of charge of the power of the backup power supply 32 is equal to or greater than a threshold;
When the determination unit 37a determines that the state of charge is less than a threshold value, charging from the power generation device 33 to the backup power supply device 32 is continued, and when the state of charge is determined to be greater than or equal to the threshold value, the power generation device 33 is determined. Switching means 37b for stopping the charging of the backup power supply device 32 from the power supply 32. In this case, the determination unit 37a determines the state of charge of the backup power supply device 32, for example, constantly or periodically. When the state of charge is determined to be equal to or greater than the threshold, the switching unit 37b supplies the backup power supply device 32 with By stopping charging, useless energy loss can be prevented. It is also possible to prevent the backup power supply device 32 from being overcharged.

The power generation device 33 includes an armature provided in one of a fixed portion and a movable portion that relatively move when the vehicle travels, and a field provided in the other that generates an electromagnetic induction effect on the armature. The electric power generated in the armature by the electromagnetic induction effect due to the relative movement of the movable part may be used as the electric power of the electric brake device.
The armature includes, for example, an armature winding and an armature core.
The field is a portion that generates a field magnetic flux, and includes, for example, a permanent magnet, a yoke / magnetic pole, a field winding, and the like.

  The field may be provided in a rotating portion that rotates in synchronization with the wheel 45 and the axle 44 in the vehicle, and the armature may be provided in an outer peripheral portion of the rotating portion. In this case, when the vehicle travels, the backup power supply 32 can be charged by efficiently rotating the field with the rotation of the axle 44 without using another drive source.

The power generation device 33A may be a wind power generation device in which the field is rotated by air resistance during travel of the vehicle.
The power generation device 33B may be a vibration power generation device in which the movable portion moves relative to the fixed portion by vibration generated when the vehicle travels.

  The electric brake device according to the present invention includes an electric motor, a brake member that applies a braking force to the wheels of the vehicle, a transmission mechanism that converts the rotational motion of the electric motor into an operation of the brake member, and a control that controls the electric motor. And a backup power supply device having a storage capacity capable of driving the electric motor, and the backup power supply device by converting a part of kinetic energy during travel of the vehicle into electrical energy. And the control device controls the electric motor by the backup power supply device when the electric power of the main power supply device that is constantly supplying electric power to the electric motor does not reach a predetermined standard. To drive. For this reason, it is possible to reduce the size of the apparatus while making the power supply system redundant.

It is sectional drawing of the electric brake device which concerns on 1st Embodiment of this invention. It is an expanded sectional view of the deceleration mechanism of the same electric brake device. It is a block diagram which shows schematic structure of the electric brake device and a power supply system. It is a flowchart which shows the control operation of the electric brake device in steps. It is a figure which shows schematically the example of the electric power generating apparatus of the electric brake device. It is a figure which shows schematically the example of the electric power generating apparatus of the electric brake device which concerns on other embodiment of this invention. It is a figure which shows schematically the example of the electric power generating apparatus of the electric brake device which concerns on further another embodiment of this invention.

An electric brake device according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the electric brake device includes a housing 1, an electric motor 2, a speed reduction mechanism 3 that decelerates the rotation of the electric motor 2, a linear motion mechanism 4 that is a transmission mechanism, and a lock mechanism 5. The brake rotor 6, the brake pad 7 as a brake member, the control device 9, the main power supply device 31 (FIG. 3), the backup power supply device 32 (FIG. 3), and the power generation device 33 (FIG. 3). .

  A base plate 8 extending radially outward is provided at the open end of the housing 1, and the electric motor 2 is supported on the base plate 8. In the housing 1 is incorporated a linear motion mechanism 4 that applies a braking force to the brake rotor 6, in this example, the disk rotor, by the output of the electric motor 2. The opening end of the housing 1 and the outer surface of the base plate 8 are covered with a cover 10.

The linear motion mechanism 4 will be described.
The linear motion mechanism 4 is a mechanism that converts the rotational motion output from the speed reduction mechanism 3 into a linear motion and causes the brake pad 7 to abut against and separate from the brake rotor 6. The linear motion mechanism 4 includes a slide member 11, a bearing member 12, an annular thrust plate 13, a thrust bearing 14, rolling bearings 15 and 15, a rotating shaft 16, a carrier 17, and sliding bearings 18 and 19. And have. A cylindrical slide member 11 is supported on the inner peripheral surface of the housing 1 so as to be prevented from rotating and movable in the axial direction. On the inner peripheral surface of the slide member 11, a spiral protrusion 11 a that protrudes a predetermined distance radially inward and is formed in a spiral shape is provided. A plurality of planetary rollers 20 to be described later mesh with the spiral protrusion 11a.

  A bearing member 12 is provided on one end side in the axial direction of the slide member 11 in the housing 1. The bearing member 12 has a flange portion extending radially outward and a boss portion. Rolling bearings 15 and 15 are fitted into the boss portions, and a rotary shaft 16 is fitted to the inner ring inner surface of each of the bearings 15 and 15. Therefore, the rotating shaft 16 is rotatably supported by the bearing member 12 via the bearings 15 and 15.

  A carrier 17 is provided on the inner periphery of the slide member 11 so as to be rotatable about the rotary shaft 16. The carrier 17 includes disks 17a and 17b that are arranged to face each other in the axial direction. The disk 17b close to the bearing member 12 may be referred to as an inner disk 17b, and the disk 17a may be referred to as an outer disk 17a. Of the one disk 17a, a side surface facing the other disk 17b is provided with an interval adjusting member 17c protruding in the axial direction from the outer peripheral edge portion on this side surface. A plurality of spacing adjusting members 17c are arranged at equal intervals in the circumferential direction in order to adjust the spacing between the plurality of planetary rollers 20. The discs 17a and 17b are integrally provided by the distance adjusting member 17c.

  The inner disk 17b is supported by a slide bearing 18 fitted between the inner shaft 17b and the inner shaft 17b so as to be rotatable and movable in the axial direction. A shaft insertion hole is formed at the center of the outer disk 17a, and a slide bearing 19 is fitted in the shaft insertion hole. The outer disk 17a is rotatably supported on the rotary shaft 16 by a slide bearing 19. A washer that receives a thrust load is fitted to the end of the rotating shaft 16, and a retaining ring for preventing the washer from coming off is provided.

  The carrier 17 is provided with a plurality of roller shafts 21 at intervals in the circumferential direction. Both end portions of each roller shaft 21 are supported across the disks 17a and 17b. That is, the discs 17a and 17b are formed with a plurality of shaft insertion holes each having a long hole, and both end portions of the roller shafts 21 are inserted into the shaft insertion holes, and the roller shafts 21 are supported so as to be movable in the radial direction. The An elastic ring 22 that urges the roller shafts 21 radially inward is stretched around the plurality of roller shafts 21.

A planetary roller 20 is rotatably supported on each roller shaft 21, and each planetary roller 20 is interposed between the outer peripheral surface of the rotary shaft 16 and the inner peripheral surface of the slide member 11. Each planetary roller 20 is pressed against the outer peripheral surface of the rotating shaft 16 by the urging force of the elastic ring 22 spanned across the plurality of roller shafts 21. As the rotating shaft 16 rotates, each planetary roller 20 that contacts the outer peripheral surface of the rotating shaft 16 rotates due to contact friction. On the outer peripheral surface of the planetary roller 20, a spiral groove that meshes with the spiral protrusion 11a of the slide member 11 is formed.
A washer and a thrust bearing (both not shown) are interposed between the inner disk 17b of the carrier 17 and one axial end of the planetary roller 20. In the housing 1, an annular thrust plate 13 and a thrust bearing 14 are provided between the inner disk 17 b and the bearing member 12.

The deceleration mechanism 3 will be described.
As shown in FIG. 2, the speed reduction mechanism 3 is a mechanism that transmits the rotation of the electric motor 2 at a reduced speed to the output gear 23 fixed to the rotation shaft 16, and includes a plurality of gear trains. In this example, the speed reduction mechanism 3 is fixed to the end of the rotary shaft 16 by sequentially reducing the rotation of the input gear 24 attached to the rotor shaft 2 a of the electric motor 2 by the gear trains 25, 26 and 27. Transmission to the output gear 23 is possible.

The lock mechanism 5 will be described.
The lock mechanism 5 is configured to be switchable between a locked state in which the braking force slack operation of the linear motion mechanism 4 is prevented and an allowed unlocked state. The deceleration mechanism 3 is provided with a lock mechanism 5. The lock mechanism 5 is a casing (not shown), a lock pin 29, an urging means (not shown) for urging the lock pin 29 to an unlocked state, and an actuator for switching and driving the lock pin 29. And a linear solenoid 30. The casing is supported by a base plate 8, and a pin hole that allows the lock pin 29 to advance and retreat is formed in the base plate 8.

  By causing the lock pin 29 to advance by the linear solenoid 30 and engaging with a locking hole (not shown) formed in the output-side intermediate gear 28 in the gear train 26, prohibiting the rotation of the intermediate gear 28, Set to locked state. When the linear solenoid 30 is turned off, the lock pin 29 is retracted into the casing by the urging force of the urging means to be detached from the locking hole, and the rotation of the intermediate gear 28 is allowed, whereby the lock mechanism 5 Is unlocked.

  FIG. 3 is a block diagram showing a schematic configuration of the electric brake device and the power supply system. The control device 9 of the electric brake device includes a brake force controller 35 that controls at least one electric actuator 34, a motor driver 36 for driving the motor, and a power supply system so that a predetermined brake force is exerted. And a power controller 37 for monitoring and power management. The electric actuator 34 includes the electric motor 2 and the linear motion mechanism 4. The brake force controller 35 and the power supply controller 37 may use, for example, a microcomputer or an application specific integrated circuit (ASIC) that is an integrated circuit, and may integrate these functions into one piece of hardware. The motor driver 36 may use a half bridge using a field effect transistor (abbreviated as FET).

  A vehicle equipped with this electric brake device is provided with an ECU 38 which is an electric control unit for controlling the entire vehicle. For example, the ECU 38 generates a command value for the brake force in accordance with the output of the sensor 39a that changes according to the operation amount of the brake operation means 39. The brake force controller 35 converts it into a current command in accordance with a brake force command value given from the ECU 38 and gives a current command to the motor driver 36.

  The brake force controller 35 obtains a motor current flowing through the electric motor 2 from the current detection means 40 and performs current feedback control. Further, as a feedback signal to the brake force controller 35, for example, a motor angle sensor signal, an axial load sensor signal of the linear motion mechanism 4, and the like may be used. Note that the brake force controller 35 has a function of outputting information such as detection values and control values relating to the electric motor 2 to the ECU 38.

The power supply controller 37 includes a main power supply diagnosis unit 41 and a backup power supply diagnosis unit 42.
The main power supply diagnosis unit 41 has a power supply diagnosis function unit 41a for determining the current power supply capability with respect to the power supply capability when the main power supply device 31 described below is in a normal state, and the power supply diagnosis function unit 41a When it is determined that at least a part is insufficient, the backup power supply device 32 supplements the insufficient power and has a power auxiliary function unit 41b used as power for the electric brake device.

The main power supply 31 is a device that constantly supplies power to the electric brake device. For example, an auxiliary battery that drives an auxiliary device of a vehicle on which the electric brake device is mounted can be used. The auxiliary machine is, for example, a power window driven by a low voltage (for example, 12V), an air conditioner, a light, a wiper, and an air bag.
The backup power supply device 32 is a dedicated device having a storage capacity capable of driving the electric motor 2, and for example, a small battery or a capacitor capable of stopping the running vehicle at least once can be used.

  Here, FIG. 4A is a flowchart showing a method of switching operation between the main power supply device 31 and the backup power supply device 32. Hereinafter, description will be made with reference to FIG. 3 as appropriate. For example, after the vehicle is turned on, this processing is started, and the power supply diagnosis function unit 41a detects the current power Pm of the main power supply device 31 using, for example, a series resistance value, a current integrated value, a voltage value, and the like. (Step a1). Next, the power supply diagnosis function part 41a acquires the threshold value P from the memory | storage means 43 provided in the control apparatus 9, for example (step a2). The threshold value P is electric power at which the power supplied from the main power supply device 31 to the electric brake device is determined to be normal, and is determined from results of experiments, simulations, and the like, for example. The threshold value P is stored in the storage means 43 so as to be rewritable.

  Next, the power supply diagnosis function unit 41a determines whether or not the detected power Pm is equal to or greater than the threshold value P (step a3). When it is determined that the power Pm is greater than or equal to the threshold value P (step a3: yes), the power auxiliary function unit 41b disconnects the electrical connection with the backup power supply device 32 (step a4), and the power controller 37 The main power supply 31 is electrically connected (step a5), and electric power is supplied from the main power supply 31 to the electric brake device. Thereafter, this process is terminated.

  When the power diagnosis function unit 41a determines that the power Pm is less than the threshold value P (step a3: no), the power auxiliary function unit 41b disconnects the electrical connection with the main power supply device 31 (step a6). The power controller 37 and the backup power supply 32 are electrically connected (step a7). As a result, the power auxiliary function unit 41b supplements the insufficient power with the backup power supply device 32 and uses it as power for the electric brake device. Thereafter, this process is terminated.

  As shown in FIG. 3, the backup power supply diagnosis unit 42 determines whether or not the state of charge of the power of the backup power supply 32 is equal to or greater than a threshold, and determines that the state of charge is less than the threshold by the determination unit 42a. When it is done, it has the switching means 42b which stops charge to the backup power supply device 32 from the electric power generating apparatus 33 mentioned later.

  Here, FIG. 4B is a flowchart illustrating an operation of charging the backup power supply device 32 with the power generation device 33. This will be described with reference to FIG. For example, after the vehicle is powered on, this processing is started. For example, when the backup power supply 32 is a battery, the determination unit 42a uses the series resistance value, the current integrated value, the voltage value, etc. The power Pb of the device 32 is detected (step b1). Alternatively, when the backup power supply 32 is composed of a capacitor, the determination unit 42a detects the current power Pb of the backup power supply 32 using the voltage value (step b1).

  Next, the determination unit 42a acquires the threshold value P ′ from the storage unit 43, for example (step b2). The threshold value P ′ is electric power that the backup power supply device 32 determines to be fully charged, and is determined from, for example, results of experiments and simulations. This threshold value P ′ is stored in the storage means 43 so as to be rewritable. Next, the determination unit 42a determines whether or not the detected power Pb is greater than or equal to a threshold value P ′ (step b3). When it is determined that the power Pb is less than the threshold value P ′ (step b3: no), the switching unit 42b electrically connects the power supply controller 37 and the power generation device 33 (step b4) and backs up from the power generation device 33. Charging the power supply device 32 is continued.

  When the determination unit 42a determines that the power Pb is equal to or greater than the threshold value P '(step b3: yes), the switching unit 42b disconnects the electrical connection with the power generation device 33 (step b5), and then ends this process. To do. In this case, the determination unit 42a determines the state of charge of the power of the backup power supply device 32, for example, constantly or periodically. When the state of charge is determined to be equal to or greater than the threshold value P ′, the switching unit 42b determines the backup power supply device 32. By stopping the charging, it is possible to prevent the backup power supply device 32 from being overcharged.

  FIG. 5 is a diagram schematically illustrating an example of the power generation device 33 of the electric brake device. This power generator 33 shows an example in which power is generated from the rotation of an axle 44 that is a movable part. The power generation device 33 converts a part of kinetic energy when the vehicle travels into electric energy and charges the backup power supply device. The power generation device 33 includes, for example, a rotor 33a provided at an axial end portion of the axle 44, a stator 33b installed at a fixed portion such as a knuckle of the vehicle, and a rectifier device (not shown).

  The rotor 33a has a field 49. The field 49 is composed of, for example, a permanent magnet, a yoke / magnetic pole, a field winding, or the like. The stator 33b has an armature 50, and this armature 50 has, for example, an armature winding and an armature core. The power generation device 33 generates electric power mainly by an electric motor composed of the field 49 and the armature 50. In the power generation device 33, the axle 44 and the rotor 33 a rotate in synchronization with the wheels 45 when the vehicle travels, and generate electric power by the electromagnetic induction effect of the armature 50. The commutator turns an alternating current generated in the winding of the armature 50 into a direct current. The direct current rectified by the commutator flows into the backup power supply device 32 (FIG. 3), and the backup power supply device 32 is charged. This charged power is used as power for the electric brake device. In this example, power is generated using a synchronous motor, but an induction type power generator can also be applied.

  According to the electric brake device described above, when the driver of the vehicle operates the brake operation means 39 at all times, the control device 9 drives the electric motor 2 by the main power supply device 31. The rotational motion of the electric motor 2 is converted into the operation of the brake pad 7 by the linear motion mechanism 4 through the speed reduction mechanism 3. As a result, the braking force is applied to the vehicle by the brake pad 7 providing frictional resistance to the wheel 45. Further, when the vehicle is traveling, the power generation device 33 converts a part of kinetic energy during traveling of the vehicle into electric energy and charges the backup power supply device 32.

  For example, when the power of the main power supply device 31 does not reach the threshold value P or more due to an abnormality occurring in the main power supply device 31, the control device 9 causes the charged backup power supply device 32 to drive the electric motor 2. To drive. Thus, even when an abnormality occurs in the main power supply device or the like, the electric motor 2 can be driven using the dedicated backup power supply device 32. As a result, a traveling distance of a certain distance or more, for example, a distance to the nearest vehicle repair shop or the like can be traveled.

  As the electric power for driving the vehicle driving motor, for example, several kW to several tens of kW of electric power is required, but the electric power for driving the electric motor 2 of the electric brake device is, for example, several W and that of the vehicle driving motor. It is much smaller than the driving power. Then, the rated output of the backup power supply device 32 can be reduced by reducing the storage capacity of the backup power supply device 32 on the basis of the electric power that can stop the running vehicle at least once. Therefore, the backup power supply device 32 can be reduced in size. It's fine. For this reason, space saving of the entire electric brake device can be achieved while achieving redundancy of the power supply system. Further, since the brake function is maintained by making the power supply system of the electric brake device redundant, the structure can be simplified and the manufacturing cost can be reduced as compared with the case where a mechanical brake is separately installed. Although power generation by the power generation device 33 results in energy loss, since the power that can stop the vehicle at least once is about several watts as described above, the energy loss due to the power generation device 33 does not affect the fuel consumption of the vehicle.

  In addition to the backup power supply device 32 that supplies electric power to the electric brake device, if a system that compensates part of the electric power required for the electric brake device from the kinetic energy of the vehicle, a harness for supplying electric power to the electric brake device is made thinner. it can. For this reason, durability of the harness can be improved and cost reduction can be achieved. Further, a redundant mechanism is provided when an abnormality occurs in the main power supply device 31.

Another embodiment will be described.
In the following description, the same reference numerals are given to the portions corresponding to the matters described in the preceding forms in each embodiment, and the overlapping description is omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in advance unless otherwise specified. The same effect is obtained from the same configuration. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

  As shown in FIG. 6, the power generation device 33 </ b> A may be a wind power generation device in which the field mechanism is rotated by air resistance during travel of the vehicle. This power generator 33A is configured such that a rotor 33Aa including a field 49 can rotate about an axis parallel to the vehicle traveling direction. A small windmill 46 is attached to one end of the rotor 33Aa in the axial direction, and the rotor 33Aa rotates together with the small windmill 46 by air resistance when the vehicle travels. A stator 33Ab in which the armature 50 is arranged circumferentially is disposed on the outer periphery of the rotor 33Aa. In this power generator 33A, the rotor 33Aa rotates due to the air resistance during travel, and the electric power generated by the electromagnetic induction effect of the armature 50 is rectified by the commutator and stored in the backup power supply device 32 to be stored in the electric power of the electric brake device Use as

  As shown in FIG. 7, a power generation device 33 </ b> B may be provided in the vehicle vibration damping device 47. This power generation device is, for example, a cylindrical member 33Ba that is interposed between a vehicle body and an arm, is provided in a vehicle body 48 that is a fixed portion, and is arranged in the vertical direction of the vehicle body 48, and along the inside of this cylindrical member 33Ba. And a movable member 33Bb provided movably. For example, the armature 50 is provided on the inner peripheral surface of the cylindrical member 33Ba, and the movable member 33Bb includes a field 49 that causes the armature 50 to generate an electromagnetic dielectric effect.

  The power generation device 33B is a vibration power generation device in which the movable member 33Bb moves relative to the tubular member 33Ba due to vibration generated when the vehicle travels, and uses the electric power generated by the relative movement as the electric power of the electric brake device. To do. The power generation device 33B may move the movable member 33Bb using a linear motor, or may use a linear motion mechanism (such as a ball screw mechanism) that converts linear motion into rotational motion and a motor.

One power generation device may be provided for each electric brake device provided on each wheel, or may be provided so as to supply electric power to a plurality of electric brake devices.
For example, the control device 9 of the electric brake device may be provided on the brake caliper, or may be provided at a position different from the brake caliper on the vehicle body side. Moreover, it is good also as a structure provided with the one control apparatus 9 in one electric actuator, and you may provide the control apparatus 9 which controls a several electric actuator simultaneously.

The main power supply 31 may be a battery dedicated to the electric brake device different from the auxiliary battery.

  FIG. 4A shows an example in which the main power supply device and the backup power supply device are completely switched. However, a power supply control circuit capable of adjusting the opening degree of each power supply is provided. It is good also as a structure which adjusts an operation ratio.

2 ... Electric motor 4 ... Linear motion mechanism (transmission mechanism)
DESCRIPTION OF SYMBOLS 7 ... Brake pad 9 ... Control apparatus 31 ... Main power supply apparatus 32 ... Backup power supply apparatus 33 ... Power generation apparatus 37a ... Determination means 37b ... Switching means 41a ... Power supply diagnosis function part 41b ... Power auxiliary function part 49 ... Field 50 ... Armature

Claims (7)

An electric brake device comprising: an electric motor; a brake member that applies a braking force to the wheels of the vehicle; a transmission mechanism that converts the rotational motion of the electric motor into an operation of the brake member; and a control device that controls the electric motor. In
A dedicated backup power supply device having a storage capacity capable of driving the electric motor;
A power generation device that converts a part of kinetic energy during travel of the vehicle into electrical energy and charges the backup power supply device; and
The control device drives the electric motor by the backup power supply device when the electric power of the main power supply device that constantly supplies electric power to the electric motor does not reach a predetermined standard. apparatus. In the electric brake device according to claim 1,
The controller is
A power supply diagnosis function unit that determines whether or not the current power supply capacity is insufficient with respect to the power supply capacity when the main power supply device is in a normal state; and
When it is determined that the power supply capability is insufficient by the power supply diagnostic function unit, the backup power supply device supplements the insufficient power, and the power auxiliary function unit used as power of the electric brake device,
Electric brake device having In the electric brake device according to claim 1 or 2,
The controller is
Determining means for determining whether or not the state of charge of the power of the backup power supply device is greater than or equal to a threshold;
When the determination unit determines that the state of charge is less than a threshold, charging from the power generation device to the backup power supply device is continued, and when the state of charge is determined to be greater than or equal to the threshold, the power generation device transmits the backup power supply. Switching means for stopping charging of the device;
Electric brake device having   The electric brake device according to any one of claims 1 to 3, wherein the power generation device includes an armature provided in one of a fixed portion and a movable portion that relatively move when the vehicle travels, and the other An electric brake having a field for generating an electromagnetic induction effect in the armature, and using electric power generated in the armature by electromagnetic induction effect due to relative movement of the movable part as electric power of the electric brake device apparatus.   5. The electric brake device according to claim 4, wherein the field is provided in a rotating portion that rotates in synchronization with a wheel and an axle of the vehicle, and the armature is provided in an outer peripheral portion of the rotating portion.   5. The electric brake device according to claim 4, wherein the power generation device is a wind power generation device in which the field is rotated by air resistance during travel of the vehicle.   5. The electric brake device according to claim 4, wherein the power generation device is a vibration power generation device in which the movable portion moves relative to the fixed portion by vibration generated when the vehicle travels.

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