JP2003322182A - Electric disc brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric disc brake device capable of preventing the deterioration of a motor coil and an insulating film by properly detecting the temperature of a motor. <P>SOLUTION: NTC thermistors 95U, 95V and 95W mounted on a U-phase coil 70U, a V-phase coil 70V and a W-phase coil 70W are connected in parallel, and temperature information of the NTC thermistors 95U, 95V, 95W of each phase are transmitted to a comparator 91 inside of a vehicle through a first outgoing line 89a and a second outgoing line 89b to prevent the overheating of the motor 12. As the prevention of overheat of the motor 12 is achieved by using only two outgoing lines (first outgoing line 89a and second outgoing line 89b) from a temperature sensor (NTC thermistor 95) with respect to a controller 62, the outgoing lines can be easily deflected, the generation of disconnection can be prevented, and further the outgoing lines can be easily led. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric disc brake device for generating a braking force by a rotating force of an electric motor.

[0002]

2. Description of the Related Art As a braking device for a vehicle such as an automobile, there is known a so-called electric braking device which does not use a brake hydraulic pressure line and generates a braking force by an output of an electric motor.

An electric brake device is disclosed in Japanese Patent Laid-Open No. 60-
As disclosed in Japanese Patent No. 206766, there is an electric disc brake device in which a brake pad is pressed against a disc rotor by a piston to generate a braking force. This type of electric disc brake device detects a brake pedal depression force (or displacement amount) by a driver by a sensor, and a controller
The rotation of the electric motor is controlled according to this detection to obtain a desired braking force.

Further, in the above-mentioned electric disc brake device, various sensors are used to detect the vehicle state such as the rotational speed of each wheel, the vehicle speed, the vehicle acceleration, the steering angle, the vehicle lateral acceleration, and the like. Boosting control by controlling the rotation of the electric motor by a controller such as a main controller or a motor driver based on the detection,
Antilock control, traction control, vehicle stabilization control, etc. can be incorporated relatively easily.

[0005]

At present, an electric disc brake device has a structure in which the rotary motion of a rotary servomotor is converted into a linear motion to push a brake pad. The electric power required for the electric motor is supplied from the battery or the generator via the controller. In this case, it is necessary to pay attention to the disconnection of the cable and the disconnection of the connector because the cable reaching the motor becomes long and the brake caliper portion provided with the electric motor is displaced.

Further, when the brake is applied, the brake pad is pressed by the rotation of the motor. Therefore, the rotation of the motor is minute or stopped when the brake is applied. Therefore, there may be a situation in which the current flowing through the coils of each phase of the motor is not the average current but only one phase is large and other phases are small. Therefore, in the usual measurement of the motor temperature (coil temperature) using one temperature sensor, the coil coating cannot be properly protected.

Further, it is conceivable that the temperature sensor is separately arranged in each phase coil and the temperature is measured separately, but since the place where the brake main body is installed is under the spring, the lead wire for the controller ( If the number of signal lines increases (for example, if temperature sensors are placed in each of the three-phase coils, 6 lead wires (2 wires x 3 systems) are required), the cable bundled together will not bend easily. Becomes For this reason, when the vibration of the same amplitude is applied to the cable, the damage becomes large and the possibility of disconnection increases. In addition, it becomes difficult to route the cable.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electric disc brake device capable of appropriately detecting the temperature of a motor and preventing deterioration of a motor coil and an insulating film. To do.

[0009]

The invention according to claim 1 is
An electric disc brake device including a disc brake main body that generates a braking force by operating a motor having a plurality of phases of coils that receive power from a controller,
A temperature sensor is arranged for each of the plurality of phase coils, the plurality of temperature sensors are connected in series or in parallel, and two lead wires are provided.
The motor temperature information is output to the controller via the two lead wires. Claim 2
The described invention is characterized in that, in the configuration according to claim 1, the temperature sensor is an NTC thermistor, and the temperature sensors are connected in parallel. According to a third aspect of the present invention, in the configuration of the first aspect, the temperature sensor is a PTC thermistor, and the temperature sensors are connected in series.

According to a fourth aspect of the present invention, there is provided an electric disc brake device comprising a disc brake main body for generating a braking force by the operation of a motor having a plurality of phases of coils supplied with electric power from a controller. A temperature sensor provided in the vicinity of a neutral point to which the end of the coil is connected or in a lead wire bundle portion where the lead wires of the coils of the plurality of phases are bundled, and a current sensor for detecting a coil current flowing through the coils of the plurality of phases, respectively. And a controller, wherein the controller uses a relative temperature increase value with respect to a neutral point of a plurality of phase coils or a lead wire bundling portion obtained based on a coil current detected by each of the current sensors as a detection value of the temperature sensor. It is characterized in that a coil temperature calculation unit for adding and calculating the temperatures of the coils of a plurality of phases is provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An electric disk brake device according to a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 1 to 4, the electric disc brake device 1 includes one side of the disc rotor 2 (usually inside the vehicle body) that rotates together with wheels (not shown).
The caliper main body 3 is disposed in the caliper main body 3, and a claw portion 4 formed in a substantially C shape and extending to the opposite side across the disc rotor 2 is integrally coupled to the caliper main body 3 by a bolt 5. Brake pads 6 and 7 are provided on both sides of the disc rotor 2, that is, between the disc rotor 2 and the caliper main body 3 and between the tip end of the claw portion 4, respectively. The brake pads 6 and 7 are supported by a carrier 8 fixed to the vehicle body so as to be movable along the axial direction of the disc rotor 2 so that the carrier 8 receives a braking torque. Are guided slidably along the axial direction of the disk rotor 2 by slide pins 9 mounted on the carrier 8.

A substantially cylindrical case 11 of the caliper body 3 to which an annular flange portion 10 formed on the base of the pawl portion 4 is joined.
An electric motor (hereinafter referred to as a motor) 12 and a rotation detector 13 are provided therein, and a ball lamp unit 14 is inserted into the rotor 15 of the motor 12 from the annular flange portion 10 side of the claw portion 4. . A cover 16 is attached to the rear end of the case 11 with bolts 17. In this embodiment, a disc brake body 60 is composed of the disc rotor 2, the caliper body 3, the brake pads 6, 7, the motor 12 and the ball ramp unit 14. The disc brake body 60 is provided under the spring.

The motor 12 is fixed to the inner peripheral portion of the case 11, and is rotatable with the plain bearings 19 and 20 facing the inner peripheral portion of the stator 18 in the case 11 and movable in the axial direction. And a rotor 15 supported by. The rotation detector 13 includes a resolver stator 23 fixed to a resolver case 22 attached to the case 11 with bolts 21,
A resolver rotor 24 fixed to the rotor 15 so as to face the resolver stator 23 is provided, and the rotational position of the rotor 15 is detected based on their relative rotation. A resolver 61 is composed of the resolver case 22, the resolver stator 23, and the resolver rotor 24.

The cover 16 includes a motor 12 and a rotation detector.
A connector 25 connected to 13 and a cable 26 are attached, and the motor 12 drives the rotor 15 in response to a control signal (electrical signal) from a main controller 62 that controls the motor 12, as shown in FIG. It can be rotated by a desired angle with a desired torque. The connector 25 and the cable 26 are inclined with respect to the axial direction of the disc rotor 2 in order to avoid interference with members such as arms, links, knuckles, and struts of the suspension device of the vehicle.
It is extended outward in the radial direction.

The ball ramp unit 14 includes a ball ramp mechanism 27 (transmission mechanism) for converting the rotational movement of the rotor 15 of the motor 12 into a linear movement, a piston 28 for pressing the brake pad 6, and a piston 28 interposed therebetween. Adjusting nut 29 and a limiter mechanism 30 for transmitting the rotation of the ball ramp mechanism 27 to the adjusting nut 29.

In the ball ramp mechanism 27, three ball grooves 37 and 38 extending in an arc shape along the circumferential direction are each 120 °.
It is formed by extending in the range of the central angle of 90 ° at intervals of. These ball grooves 37, 38 are inclined in the same direction, a ball 34 is inserted between the ball grooves 37, 38, and the relative rotation of the fixed disk 32 and the movable disk 33 causes the balls to move to 3
One ball 34 rolls in the ball grooves 37 and 38, and the movable disk 33 and the fixed disk 32 relatively move in the axial direction in accordance with the rotation angle.

As shown in FIG. 5, the main controller 62 generates the control signal E ₀ based on the detection signal from the vehicle state detection sensor, and controls the motor driver 63 by this control signal E ₀ to drive the motor. 12 is driven to generate a braking force on the disc brake body 60.

The main controller 62 includes an oscillator 41, a synchronous detection circuit 42 connected to the oscillator 41, and a synchronous detection circuit 42.
From the control signal E ₀ (control signals E1 to E6)
Of the motor driver 63 to the first to sixth FETs 81 to 86 to operate the first to sixth FETs 81 to 86
43, a correction circuit 50, an addition circuit 51, and a comparator 91 described later.

Each component of the main controller 62 will be described below. The current value supplied to the motor 12 is calculated according to the signal of the brake pedal operated by the driver (detection signal of the pedaling force sensor), and the torque command value E _P is obtained. Regarding the torque command value E _P , a function to reversely rotate the motor 12 when the brake pedal is released to prevent the brake pad from being dragged, and a function to vary the braking force for each of the four wheels for traction control. It is also possible to set the value in consideration of.

The torque command value E obtained as described above
_{According to P} , the oscillator 41 generates a sine wave signal Esin (ωt), and the phases of the sine wave signal Esinωt are 120 ° and 240 °, respectively.
° Different sine wave signals Esin (ωt-2π / 3) and Esin
(Ωt-4π / 3) is generated, these are output to the synchronous detection circuit 42, and the signals Ecosωt and Esinωt are output to the resolver 61.

In the synchronous detection circuit 42, the signal Esi is obtained by synchronously detecting Esin (ωt + θ) obtained from the resolver 61.
n (θ), Esin (θ−2π / 3) and Esin (θ−4π / 3) are obtained and output to the PWM conversion circuit 43. The PWM conversion circuit 43 uses the signals Esin (θ), Esin (θ−2π / 3),
Based on Esin (θ−4π / 3), a control signal E ₀ (control signals E1 to E6) is generated and output to the motor driver 63 as shown in FIG. As a result, the control signal E
A voltage corresponding to ₀ (control signals E1 to E6) is applied to the U-phase coil 70U, the V-phase coil 70V, and the W-phase coil 70W that are Y-connected as shown in FIG.

When the voltage is applied to the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W as described above, a rotating magnetic field is generated in the stator 18 of the motor 12, and accordingly the rotor 15 is rotated. It generates rotation torque and rotates. The rotary operation of the rotor 15 will be briefly described as follows.

That is, the sine wave voltage is applied to the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W of the stator 18 as described above at the positions of the rotor 15 and the stator 18 in FIG. When an S pole (a magnetic pole of the rotating magnetic field formed by energizing the coil) is generated in the rotor and an N pole (a magnetic pole of the rotating magnetic field formed by energizing the coil) is generated in the W-phase coil 70W, the rotor 15 The N pole of is attracted to the U-phase coil 70U side. Similarly for the S pole, the W phase coil 7
It is pulled to the 0W side. By the electromagnetic force thus acting, a rotation torque is generated in the rotor 15 and the rotor 15 rotates.

Here, when the motor 12 rotates in the forward direction, the gap between the brake pads becomes narrower, the brake pads come into contact with each other, and the braking force acts. Then,
The motor 12 is stopped except that the caliper is deformed and the brake pad is compressed by the reaction force of the brake. When the braking force is increased, the stop position of the motor 12 (relative positional relationship between the rotor and the stator) is determined. U-phase coil 70U, V-phase coil 70V and W-phase coil 70W at that time
The voltages Vu, Vv, Vw of are calculated by the following equations, where θ is the rotation angle of the motor 12.

Vu = Esin (θ) Vv = Esin (θ-2π / 3) Vw = Esin (θ-4π / 3)

Therefore, when the rotation angle θ is a predetermined angle, for example, when θ = 0, the voltage of the U-phase coil 70U becomes 0, and no current flows in the U-phase coil 70U. Further, since the voltage in the opposite direction is applied to the other coils (V-phase coil 70V and W-phase coil 70W), the V-phase coil 70V to the W-phase coil 7
A current will flow to 0 W (or from the W-phase coil 70 W to the V-phase coil 70 V). Here, since the motor 12 is not rotating, the heat generation amount of the coil of the motor 12 is
V phase and W phase coils 70U, 70V, 70W) are determined from the resistance and current values. The calorific value is obtained by multiplying the coil resistance value by the square of the current value.

U-phase, V-phase and W-phase coils of the motor 12 (U-phase coil 70U, V-phase coil 70V and W-phase coil 70W)
NTC thermistors 95 (temperature sensors) are respectively arranged in the vicinity of. NTC thermistor 95 corresponding to U-phase, V-phase and W-phase coils 70U, 70V, 70W respectively corresponding to U-phase, V-phase and W-phase NTC thermistors 95U, 95V, 95
W.

In the first embodiment, the NTC thermistor 95 is used as the temperature sensor as described above.
Thermistors and platinum resistance thermometers are widely used as temperature sensors. An ordinary thermistor (corresponding to the NTC thermistor 95) has a negative temperature coefficient, and a platinum resistance thermometer has a positive temperature coefficient. Among the thermistors, the thermistor having a negative temperature coefficient is an NTC thermistor [the temperature line sensor of the present embodiment (NTC thermistor 95)
Corresponds to this. ], And the PTC thermistor 96 corresponds to the temperature line sensor (PTC thermistor 96) of the second embodiment described later. ]]. The thermistor can realize three types of temperature coefficients by changing the material, and the following types are widely used.

(1) NTC thermistor: A semiconductor made of nickel, cobalt, manganese, etc., which has a low resistance value at high temperatures and a negative temperature coefficient of resistance value. (2) PTC thermistor: barium titanate (BaTio ₃ )
Oxide ceramics whose main component is and whose resistance increases rapidly with temperature. (3) CTR thermistor: a thermistor made by mixing powder of vanadium pentoxide with a metal oxide and sintering the powder at about 1000 ° C, and the resistance value rapidly decreases with temperature.

The resistance value R of the NTC thermistor 95 is obtained from the thermistor constant B and the temperature T _A (absolute temperature, Kelvin) by the following equation (1). R = R ∞ exp (B / T _A ) ... (1) Here, R ∞ is the resistance value of the thermistor at a virtual infinite temperature, and this resistance value R ∞ is obtained by the following equation (2). R∞ = R ₂₅ / exp (B / T ₂₅ ), where T ₂₅ is the absolute temperature corresponding to 25 ° C.

The NTC thermistor 95 exhibits a temperature-resistance value characteristic in which the resistance value decreases as the temperature rises, as shown in FIG. Here, consider a case where there is a difference in the currents flowing through the three-phase coils (U-phase, V-phase, W-phase coils 70U, 70V, 70W), and as a result, the coil temperatures differ. The motor current Im is obtained by squaring the current values [Iu, Iv, Iw] of each phase and adding them, as shown in the following formula (3): 1/3
It is obtained by multiplying by the square root. Im = [(Iu ² + Iv ² + Iw ² ) / 3] ^1/2 (3)

Considering the unbalanced state of the coil current in this state, the current flowing into the W phase and the V phase flows out from the U phase as it is. Therefore, the magnitude | Iu | It becomes as shown in the following equation (4). | Iu | = 2 × | Iv | = 2 × | Iw | (4) Therefore, 1.4 times the motor current Im may flow to one coil, and the amount of heat generation there becomes twice. I understand. Since the other coils have 0.7 times the current, the amount of heat generated is halved. For this reason, the NTC thermistor 95 corresponding to the one coil and the NTC thermistor 95 corresponding to the other coil measure a temperature difference that is four times different.

Therefore, in the present embodiment, the NTC thermistor 95 is installed in each of the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W, and three NTCs corresponding to each phase are provided.
Thermistor 95 (U-phase, V-phase, W-phase NTC thermistor 95
U, 95V, 95W) are connected in parallel. As described above, when the coil temperatures of the respective phases are different, U-phase, V-phase, and W-phase NTC thermistors 95U, 95V, 95 connected in parallel.
The resistance values Ru, Rv and Rw of W and the combined resistance value are obtained. In this case, the thermistor constant B is 3000K, the motor 12
(Motor body) temperature (ambient temperature) is 100 ° C, thermistor resistance R is 3KΩ, U-phase coil 70U is 20 ° C due to coil heat generation, V-phase coil 70V and W-phase coil 70W are 5
It is assumed that the temperature rises by ℃. When the resistance values Ru, Rv, and Rw of the U-phase, V-phase, and W-phase NTC thermistors 95U, 95V, and 95W are calculated based on the equation (1), the resistance value Ru is about
The resistance is 2.0 KΩ and the resistance values Rv and Rw are about 2.7 KΩ. Therefore, the combined resistance value is, as shown in equation (5),
It becomes about 0.8 KΩ.

[0035] R (120 ° C + 105 ° C + 105 ° C) = 1.992 // 2.697 // 2.697 = 0.804 [KΩ]… (5 )

The combined resistance value (0.804K) obtained by the equation (5)
Ω) is the combined resistance obtained when the temperature rises of the U-phase, V-phase, and W-phase coils 70U, 70V, and 70W are 10.3 ° C (average temperature rise) as shown in the following equation (6). Value (0.806
KΩ). That is, since there is a certain correspondence relationship described later between the case where the temperature rises of the coils of the respective phases are different and the case where the temperature rises are the same, by obtaining the combined resistance value (current), the U phase, the V phase, and the W phase are obtained. Phase coil
The average temperature rise and maximum temperature rise of 70U, 70V, 70W can be detected. R (110.3 ℃ ＋ 110.3 ℃ ＋ 110.3 ℃) ＝ 2.417 // 2.417 // 2.417 ＝ 0.806 [KΩ]… (6)

The above-mentioned constant correspondence is that the average temperature rise of the thermistor is substantially equal to the temperature rise calculated from the combined resistance value of the three thermistors [calculated temperature rise value], and the maximum temperature rise is the average temperature rise. It is a relation that is approximately twice the value of [approximately equal to the calculated temperature rise value]. As a condition for the coil temperature imbalance, there may be a case where current does not flow in one of the three coils. In that case, the temperature rise is as follows. If the temperature rise of two of the three coils where current flows is 20 ° C and the temperature rise of one coil where no current flows is 0 ° C, the resistance value [ambient temperature is 100 ° C It is assumed that the value is 3 KΩ. ] Are 1.992 [KΩ] and 3.000 [KΩ], respectively, so the combined resistance R (120 ° C + 12
0 ° C + 100 ° C) is 0.748 [K as shown in the formula (6A).
Ω]. R (120 ° C + 120 ° C + 100 ° C) = 1.992 // 1.992 // 3.000 = 0.748 [KΩ]… (6A)

Further, when the temperature of the three thermistors rises equally (temperature rise of 14 ° C.) and the temperature becomes equal (114 ° C.), the combined resistance value R (114 ° C. + 114 ° C. +) of the three thermistors
114 ° C. is R (114 ° C. + 114 ° C. + 114 ° C.) = 2.243 // 2.243 // 2.243 = 0.748 [KΩ] (6B). Equivalent temperature rise (14
Combined resistance value of three thermistors R (114 ° C + 114 ° C)
C. + 114.degree. C.) is approximately equal to the combined resistance R (120.degree. C. + 120.degree. C. + 100.degree. C.) obtained when the temperature rise obtained by the formula (6A) is different [in this case, it is the same. ].
Therefore, the temperature of the three thermistors rises equally, that is, the temperature (114 ° C.) after the average temperature rise is 3 when the unbalanced state (when no current flows in one of the three coils). Average temperature of two coils (120 ℃
It is approximately equal to + 120 ° C + 100 ° C) / 3 = 113.3 ° C, and it is possible to obtain the other from either one. Further, in this case, the maximum temperature rise (20 ° C.) is about 1.4 times the temperature rise 14 ° C. (114 ° C.-100 ° C.) obtained from the combined resistance value, so a double current flows in the U phase. The maximum temperature rise is lower than in some cases.

The temperature rise is 40 ° C (R
U-phase coil 70U), 10 ° C (RV-phase coil 70V and W-phase coil 70W), as shown in equation (7), U
Resistance value of NTC thermistor 95 of phase is about 1.4KΩ, V phase,
The resistance value of the W-phase NTC thermistor 95 is about 2.4 KΩ, and the combined resistance value is about 0.65 KΩ. R (140 ° C + 110 ° C + 110 ° C) = 1.377 // 2.432 // 2.432 = 0.646 [KΩ] (7)

Also in this case, the combined resistance value (0.646 KΩ) obtained by the equation (7) is calculated by the following equation (8).
Temperature rise of V phase, W phase coils 70U, 70V, 70W is 21
Since it is almost equivalent to the combined resistance value (0.651 KΩ) obtained when it is assumed that the temperature is ℃ (average temperature rise), in this case also, the case where the temperature rise of the coil of each phase is different and the case where it is equivalent , There is the above-mentioned certain correspondence, and the average temperature rise and the maximum temperature rise of the U-phase, V-phase, W-phase coils 70U, 70V, 70W can be detected by obtaining the combined resistance value (current). . R (121 ° C + 121 ° C + 121 ° C) = 1.954 // 1.954 // 1.954 = 0.651 [KΩ] (8)

Next, targeting a plurality of types of NTC thermistors 95 having different thermistor constants B, the temperature detection errors of the U-phase, V-phase and W-phase NTC thermistors 95U, 95V, 95W are calculated, and the results are shown in the table of FIG. Shown in 1. Here, the average temperature difference and the maximum temperature error are calculated as follows. When the current flowing through the two coils (here, V phase, W phase coils 70V, 70W) flows through one coil (U phase coil 70U),
The temperature rise of the one coil (U-phase coil 70U) becomes four times. Then, for example, the temperature rise of the V-phase and W-phase coils 70V and 70W is 5 ° C, and the temperature rise of the U-phase coil 70U is 20 ° C.
Then, the average temperature rise inside the motor is 10 ° C [Because the masses of the measured parts are almost equal, the temperature rises of the V-phase and W-phase coils 70V and 70W are 5 ° C and the U-phase coil 7 respectively.
If the temperature rise of 0U is 20 ℃, the temperature rise will be 10 ℃
Becomes ] And each phase coil (V phase, W phase coil 70
The maximum temperature rise of V, 70W) is 20 ℃. Table 1 (Fig. 7)
Then, the average temperature difference is the difference between the temperature rise value [calculated temperature rise value] obtained from the combined resistance value and the average temperature rise [(average temperature difference) = (calculated temperature rise value) − (average temperature rise)].
Is the value obtained as.

Then, it is assumed that the U-phase, V-phase, and W-phase NTC thermistors 95U, 95V, 95W [thermistor constant B is 2500K. ] The temperature rise calculated by the calculation based on the resistance value when connected in parallel (calculated temperature rise value) is 10.3 ℃
Therefore, the difference between this temperature rise of 10.3 ° C. and the average temperature rise inside the motor (10 ° C. above) (this difference is called the average temperature difference). ] To obtain 10.3-10 = 0.3 ° C. Also, U phase,
The maximum temperature error is obtained by subtracting the calculated temperature rise value [10.3 ° C] from the maximum temperature rise value (maximum temperature) [20 ° C] of the temperature rise values of the V-phase and W-phase coils 70U, 70V, 70W. [Maximum temperature error] = [Maximum temperature rise value (maximum temperature)]-
[Calculated temperature rise value] = 20-10.3 = 9.7 [° C]

Even if the temperature rise is 40 ° C., the difference between the temperature calculated from the combined resistance value [calculated temperature rise value] and the finally reached temperature (average temperature) is about 1 ° C. ,
Both can be regarded as substantially equal], the average temperature of the coils [U-phase, V-phase, W-phase coils 70U, 70V, 70W] can be measured in the temperature range of 100 to 140 ° C. Then, as described above, the average temperature rise [substantially equivalent to the calculated temperature rise value] can be detected assuming that the value is about half the maximum temperature rise, and the ambient temperature (beginning of braking) The temperature rise is calculated from the previous temperature). In the above example, the maximum temperatures were calculated at 120 ° C and 140 ° C, but in this case, the maximum temperature rises are 40 ° C and 20 ° C. However, since the average temperature rise is 20 ℃ and 10 ℃ (10.3 ℃),
The maximum temperature error is 20 ° C (40 ° C-20 ° C) and 10 ° C (20 ° C-1 ° C).
0.3 ° C).

Further, as shown in Table 1, when the thermistor constant B is larger than 3000K, the resistance value of the thermistor having a high temperature is further lowered because the resistance value is largely decreased even if the temperature rise is the same. For this reason, the resistance value is lower than the resistance value of the three thermistors in parallel at the average temperature, and it is possible to detect a more practical temperature. As the thermistor constant B increases, the maximum temperature error decreases. You can tell by going.

In the first embodiment, as described above, the NTC thermistor 95 is connected to the U-phase coil 70U and the V-phase coil 70V.
, And three NTC thermistors 95 installed in the W-phase coil 70W and corresponding to each phase are connected in parallel. One end of each of the three NTC thermistors 95 connected in parallel is connected to one end of a lead wire (hereinafter referred to as a first lead wire) 89a, and each other end is connected to a lead wire (hereinafter referred to as a second lead wire). It is connected to one end of 89b. The other ends of the first lead wire 89a and the second lead wire 89b are drawn to the outside from the motor 12 arranged under the spring and connected to the comparator 91 (temperature detection circuit) of the main controller 62 arranged inside the vehicle. Has been done.

The comparator 91 includes an operational amplifier 92, two resistors (referred to as first and second resistors R2 and R3) for connecting a positive (+) terminal of the operational amplifier 92 and a threshold value, and the operational amplifier 92. And a pull-up resistor R1 connected to the negative (-) terminal of. The second lead wire 89b is connected to the minus terminal of the operational amplifier 92, and the first lead wire 89a is connected to the plus terminal.
A battery 93 is connected to the negative terminal of the operational amplifier 92 (and thus the NTC thermistor 95) via the pull-up resistor R1.
(Power supply) is connected, and a voltage is applied to the NTC thermistor 95 via a pull-up resistor R1. The voltage applied to the NTC thermistor 95 (NTC thermistor 95 voltage) is detected by the comparator 91 as the first and second resistors R2,
It is compared with the reference voltage obtained by R3.

If the voltage of the NTC thermistor 95 is lower than the reference voltage, the output of the comparator 91 becomes positive and NT
If the voltage of the C thermistor 95 is higher than the reference voltage, the output of the comparator 91 becomes negative. The output of the comparator 91 is connected to a transistor 94 that controls on / off of an on / off conversion circuit (not shown) of the PWM conversion circuit 43, and
When the voltage of the thermistor 95 is low, the transistor 94 is turned on, and the output of the PWM signal is stopped. Therefore, when the temperature of the coil (U-phase coil 70U, V-phase coil 70V or W-phase coil 70W) rises and approaches the temperature at which the coil coating deteriorates, the output of the PMW signal to the motor driver 63 is stopped. Therefore, the motor 12 is no longer overheated.

In the first embodiment configured as described above, the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70 are arranged.
The NTC thermistor 95 installed in W is connected in parallel, and the temperature information of the NTC thermistor 95U, 95V, 95W of each phase is displayed first.
It is sent to the comparator 91 inside the vehicle through the lead wire 89a and the second lead wire 89b to prevent the motor 12 from overheating.
In this way, the main controller 62 protects the motor 12 from overheating.
Since the lead wire from the temperature sensor (NTC thermistor 95) for the above is suppressed to two (first lead wire 89a and second lead wire 89b), the lead wire is easily bent,
As a result, the occurrence of disconnection can be suppressed, and the leader line can be easily routed.

Next, a second embodiment of the present invention will be described with reference to FIGS. 8 and 9. In the second embodiment, a PTC thermistor 96 (having a positive temperature coefficient) is used in place of the NTC thermistor 95 of the first embodiment, and 3
Comparing two PTC thermistors 96 in series
Connected to 91 is mainly different. As shown in FIG. 9, the PTC thermistor 96 exhibits temperature-resistance value characteristics in which the resistance value rapidly increases as the temperature rises, and the logarithmic value of the resistance value is proportional to the temperature. The resistance value R is represented by the following equation (10), where the temperature coefficient is α. R = Rαexp (α (T−T _A )) (10)

The value of α becomes about 35% when only barium titanate (BaTio ₃ ) is used, and the value becomes small when a part of barium is replaced with strontium. 20
% Becomes about 8%. As an example of resistance value, α is 15%, resistance value at 100 ℃ is 1KΩ, and up to 80 ℃ is 1
It becomes about 0Ω and then becomes 2 MΩ at 150 ° C.

In the second embodiment, the PTC thermistor 96 for detecting overheat of the motor 12 is installed in the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W as described above. The three PTC thermistors 96 corresponding to each phase are
Lead lines (hereinafter, referred to as a first lead line 89a and a second lead line 89b) are connected in series and are connected to the PTC thermistor 96 on one end side and the PTC thermistor 96 on the other end side.

When the temperature of the motor 12 rises, the resistance value of the PTC thermistor 96 increases and the positive input voltage of the comparator 91 increases. Therefore, the output of the comparator 91 becomes positive at a predetermined voltage or higher, and the PWM conversion circuit
Since the transistor 94 for controlling on / off of the on / off conversion circuit 43 is turned on, the PWM output is stopped. Therefore, the motor 12 is no longer overheated.

In the second embodiment configured as described above, the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70 are arranged.
The PTC thermistor 96 installed in W is connected in series, and the temperature information of the PTC thermistor 96 of each phase is connected to the first lead wire 89a.
And the comparator 91 inside the vehicle through the second lead wire 89b
(Main controller 62) to prevent overheating of the motor 12. In this way, the temperature sensor (PTC thermistor) for the main controller 62 is used to prevent overheating of the motor 12.
96) and two lead lines (first lead line 89a and second lead line)
Since the leader line 89b) is used as a restraint, the leader line is easily bent, which in turn suppresses the occurrence of disconnection and allows the leader line to be easily routed.

Here, the relationship between the resistance value and the temperature when the PTC thermistor 96 is connected in series will be obtained. U-phase coil 70
PTC thermistor 96 (hereinafter referred to as U-phase, V-phase and W-phase P, respectively) corresponding to the U-phase coil 70V and the W-phase coil 70W
TC thermistors 96U, 96V, 96W) have a resistance value of 1 KΩ at 100 ° C. U was 100 ℃
The temperature of the phase coil 70U, the V phase coil 70V, and the W phase coil 70W rises, and the coil with the highest temperature (U phase coil
70U) temperature reaches 120 ℃ (temperature rise 20 ℃) and
U phase, V phase and W phase PTC thermistors 96U, 96V, in two cases at 140 ℃ (temperature rise of 40 ℃)
Calculate the resistance value of 96W and the combined resistance value.

In the former case [when the U-phase coil 70U reaches 120 ° C (temperature rise of 20 ° C)], the V-phase coils 70V and W are used.
U assuming that the phase coil 70W reaches 105 ℃ (temperature rise 5 ℃)
Calculate the resistance value of PTC thermistors 96U, 96V, 96W for phase V, phase V and phase W. In this way, the U-phase coil 70U is 120
V phase coil 70V when the temperature rises to 20 ℃
And the reason why the W-phase coil 70W becomes 105 ° C (temperature rise 5 ° C) is that two coils (here, V-phase coil 70V and W
Phase coil 70W. ) Current flows through one coil (U-phase coil 70U), that coil (U phase coil 70U)
The temperature rise of the phase coil 70U) is based on the fact that the temperature rise of the other two coils (V phase coil 70V and W phase coil 70W) is four times as high. Similarly, in the latter case [U
When the phase coil 70U reaches 140 ° C (temperature rise 40 ° C)], the resistance value is calculated assuming that the V-phase coil 70V and the W-phase coil 70W reach 110 ° C (temperature rise 10 ° C).

First, in the case of the former [U-phase coil 70U is 120 ° C.
(When the temperature rises 20 ° C)], the formula (10)
Based on U phase, V phase and W phase PTC thermistor 96
U, 96V, 96W resistance value Ru (120 ℃), Rv (105 ℃) and Rw (105 ℃) and combined resistance value R (120 ℃ + 105 ℃ + 105)
When the temperature (.degree. C.) is calculated, the following expressions (11) to (14) are obtained.

[0057]   Resistance value of U-phase PTC thermistor 96U Ru (120 ℃)                                   = 20 [KΩ] (11)   Resistance value Rv (105 ℃) of V-phase PTC thermistor 96V                                   = 2.1 [KΩ] (12)   Resistance value Rw (105 ℃) of W-phase PTC thermistor 96W                                   = 2.1 [KΩ] (13)   R (120 ° C + 105 ° C + 105 ° C) = 20 + 2.1 + 2.1                                   = 24.3 [KΩ] (14)

Similarly, in the latter case [U-phase coil 70
When U becomes 140 ° C (temperature rise 40 ° C)], U-phase, V-phase and W-phase PTC thermistors 96U, 96V, 96W resistance R
When u (140 ° C.), Rv (110 ° C.) and Rw (110 ° C.) and the combined resistance value R (140 ° C. + 110 ° C. + 110 ° C.) are obtained, the following equations (15) to (18) are obtained.

[0059]   Resistance value of U-phase PTC thermistor 96U Ru (140 ℃)                                       = 403 [KΩ] (15)   Resistance value Rv (110 ℃) of V-phase PTC thermistor 96V                                       = 4.5 [KΩ] (16)   Resistance value Rw (110 ℃) of W-phase PTC thermistor 96W                                       = 4.5 [KΩ] (17)   R (120 ℃ + 105 ℃ + 105 ℃) = 403 + 4.5 + 4.5                                       = 412 [KΩ] (18)

In the former and latter cases, the combined resistance value when the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W have the same temperature rise is calculated as follows. First, in the former case [when the U-phase coil 70U reaches 120 ° C. (temperature rise 20 ° C.)], the combined resistance value is given by the following equation (19). R (114 ° C + 114 ° C + 114 ° C) = 8.1 + 8.1 + 8.1 = 24.3 [KΩ] (19)

In the latter case [U-phase coil 70U is 140 ° C.
When the temperature rises 40 ° C.], the combined resistance value is given by the following equation (20). R (132.5 ° C + 132.5 ° C + 132.5 ° C) = 131 + 131 + 131 = 393 [KΩ] (20)

From the above calculation example, since the temperature (maximum temperature) of the U-phase coil is 120 ° C., the temperature [calculated temperature rise value] obtained from the combined resistance value is 114 ° C. Compared to -6 ℃, compared to the average temperature (110 ℃) + 4 ℃
Therefore, it is required to be higher than the average temperature. If the average temperature is 120 ° C (maximum temperature is 140 ° C, other coil temperature is 110 ° C), the difference from the maximum temperature is 7.5 ° C and the difference from the average temperature is + 2.5 ° C, so Is also detected higher than the average temperature.

From the characteristics of the NTC thermistor and the PTC thermistor described above, if the temperature before the motor heats up (the temperature when no current is flowing through the motor) is known, it is calculated from the detection value of the temperature sensor connected in parallel or in series. It can be said that a value about twice the above temperature and the temperature difference is the maximum temperature exhibited by the coil of the motor. Therefore, when calculating the motor temperature, the temperature of the motor when no current is applied and the value of twice the temperature rise when current is applied to the motor are calculated to calculate the coil temperature of the motor. It is possible to obtain the temperature in a state where the temperature rise is considered.

In the first embodiment, CT
Even if the R thermistors are arranged in the U-phase coil 70U, the V-phase coil 70V, and the W-phase coil 70W, respectively, and three CTR thermistors are connected in parallel with the NTC thermistor 95 (third embodiment). Good. As described above, the CTR thermistor has a characteristic that the resistance value sharply decreases when the temperature exceeds the predetermined temperature Tc.

In the third embodiment, the resistance value of the CTR thermistor is very large until the temperature reaches the predetermined temperature Tc, so that the current does not flow through the CTR thermistor but through the NTC thermistor 95. Therefore, until the temperature reaches the predetermined temperature Tc, the operation is the same as in the case where the above-mentioned three NTC thermistors 95 are used (first embodiment). When the temperature reaches the predetermined temperature Tc, the resistance value of the CTR thermistor sharply drops. As a result, a current also flows through the CTR thermistor, and the current value shows a peculiar change different from before. It can be seen that the CTR thermistor has reached the predetermined temperature Tc due to the peculiar change in the current value.

Next, a fourth embodiment of the present invention will be described. The fourth embodiment has a thermistor (temperature sensor) arranged in each of the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W, and a current is passed through the thermistor to allow the thermistor to radiate heat. At this time, the heat dissipation coefficient is obtained, and when the heat dissipation coefficient becomes small, it is determined that the thermistor is broken. When a current is passed through the thermistor, the temperature of the thermistor itself rises due to self-radiation. The temperature rise is determined by the relationship of heat exchange between the outside and the inside of the thermistor, which is called the heat dissipation coefficient. The heat dissipation coefficient C is the electric power P supplied to the thermistor,
It is determined from the relationship of the temperature increase ΔT and can be expressed by the following equation (30). C = P / ΔT (30)

Here, the temperature rise ΔT is obtained from the temperature of the thermistor, but if the structure of the thermistor, the structure of the motor coil to be measured, and the mounting method do not change, the U-phase coil 70U, the V-phase coil 70V and the W-phase coil are used. The heat dissipation coefficients of the thermistors arranged at 70 W are C1, C2 and C3, respectively.
Then, if it is normal, C1 = C2 = C3, and the relationship between the temperature increase ΔT and the electric power P is the same as the case where one thermistor is considered.

The power supplied to the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W is P1, P2 and P3, and in a normal state, a value of 1/3 of the total power P is supplied to one thermistor. Then, the following electric power relationship is established. P1 = P2 = P3 = P / 3 (31)

Then, the heat dissipation coefficient C is obtained from the calculated temperature rise ΔT and the supplied power P by the equation (32). C = P / 3 / ΔT (32)

Here, when one thermistor is disconnected, if the power P is the same, the power supplied to one thermistor increases by 1.5 times. This is the same as the resistance value being 1.5 times, so the value converted to temperature is 20 ℃.
Low detection (when the thermistor constant B is 3000K).

Here, as the calculated temperature rise value, since the same value as the actual temperature rise value can be measured with three or two thermistors, the ratio of the supplied power to the temperature rise, that is, the heat dissipation coefficient is reduced. To be measured. The ratio is 1/1.
It is 5. This shows that the temperature rise is high for a certain electric power, and it is difficult to generate heat from the inside of the thermistor.

Here, it is assumed that the thermistor is disconnected, but considering that the contact between the thermistor and the coil becomes poor and the temperature of the coil cannot be accurately measured, heat is hardly released from the thermistor in this case as well. Therefore, the heat dissipation coefficient becomes small. Therefore, when a power pulse is applied to the thermistor to raise the temperature, the thermistor disconnection and the contact state between the thermistor and the coil can be measured. In all of the above-mentioned embodiments, the configuration has been described in which the lead wire is connected to the comparator 91 in the main controller 62, but the present invention is not limited to this, the comparator 91 is provided in the motor driver 63, and the motor driver 63 transfers it to the motor 12. Alternatively, the power supply may be stopped.

Next, an electric disc brake device 1D according to a fifth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIGS. 1 and 5. It should be noted that members and portions equivalent to those shown in FIGS. 1 to 9 are denoted by the same reference numerals, and description and illustration thereof will be omitted as appropriate. In FIG. 10, a brushless motor (hereinafter referred to as a motor) 12A of three-phase concentrated winding is used in the electric disc brake device 1D according to the fifth embodiment, and the motor 12A is the first Similar to the embodiment, a Y-connected U-phase coil 70U, V-phase coil 70V and W-phase coil 70W (see FIG. 5) are provided. U-phase coil 70U, V-phase coil 70V
The temperature of the neutral point 98 (neutral point temperature) T at or near the neutral point 98 to which each one end of the W-phase coil 70W is connected.
One temperature sensor 95A for detecting _S is provided.

The U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W have lead wires (U-phase lead wire 100U, V-phase lead wire 100V and W-phase lead wire 100W) connected to the other ends thereof. ), And a motor driver 63 that supplies electric power to the motor 12A, and the like, and is connected to a battery 93 (power source). A U-phase current sensor 102U is provided on the U-phase lead wire 100U. Similarly, the V-phase lead wire 100V and the W-phase lead wire 100W are provided with a V-phase current sensor 102V and a W-phase current sensor 102W, respectively. The U-phase current sensor 102U, the V-phase current sensor 102V, and the W-phase current sensor 102W respectively include a U-phase lead wire 100U, a V-phase lead wire 100V, a W-phase lead wire 100W, and a U-phase coil.
Currents flowing through 70U, V-phase coil 70V and W-phase coil 70W (each coil current IZU, coil current IZV and coil current I
ZW) is detected.

The electric disc brake device 1D includes a motor.
It has a controller 62A for controlling 12A. The controller 62A includes a coil temperature T _U, the coil temperature calculating unit 110 to obtain the coil temperature T _V and W-phase coil temperature T _W of the coil 70W of V-phase coil 70V in the U-phase coil 70U. Coil temperatures T _U , T _V and T _W obtained by the coil temperature calculation unit 110
Are U-phase coil 70U and V-phase coil 70V corresponding to each
It is also used to prevent deterioration of the W-phase coil 70W and the insulating film.

In the fifth embodiment, the U-phase lead wire 10
The current sensors (U-phase current sensor 102U, V-phase current sensor 102V, and W-phase current sensor 102W) are provided on the 0U, V-phase lead wire 100V, and W-phase lead wire 100W, respectively. Coil current I _U of phase coil 70U, coil current _IV and W of V phase coil 70V
The coil current I _W of the phase coil 70 _W is measured. The current sensors need not be provided in all three phases, but may be provided in two phases and the current of the remaining one phase may be calculated.

Of the U-phase coil 70U, the V-phase coil 70V and the W-phase coil 70W, the heat generated by the U-phase coil 70U is generated by the U-phase coil 70U.
Since it is equivalent to the square of the product of the resistance value and the coil current I _U, the temperature increase [Delta] T _U of the U-phase coil 70U is possible to infer from the coil current I _U of the U-phase coil 70U . Then, the temperature increase ΔT _U of the U-phase coil 70U is 2 of the proportional constant k and the coil current I _U as shown in the following equation (30).
It can be represented by the product of the power and the energization time Δt.

ΔT _U = kI _U ² × Δt (30)

[0079] As for the temperature rise [Delta] T _W of temperature rise [Delta] T _V and W-phase coil 70W of V-phase coil 70 V, as in the case of temperature rise [Delta] T _U of the U-phase coil 70U, the formula (3
It can be represented according to 0).

Although the temperature rise ΔT _U of the U-phase coil 70U is known from the equation (30), the coil temperature T _U of the U-phase coil 70U is unknown only by the equation (30). This is
It is to say the same for the temperature rise [Delta] T _V and W-phase coil 70W temperature rise [Delta] T _W of the V-phase coil 70 V, only the [equation conforming to the formula (30)] Equation showing the temperature rise [Delta] T _V, [Delta] T _W is The coil temperature T _V and the coil temperature T _W are unknown. In the present embodiment, the coil temperature T _U , the coil temperature T _V, and the coil temperature T _W are determined as follows in consideration of the fact that the heat generated by the motor coil is transferred as follows. .

That is, the motor coil (U-phase coil 70
The heat of the U-phase coil 70V, the W-phase coil 70V, and the W-phase coil 70W is transferred from the coil 70U, 70V, 70W to the caliper main body 3 through an iron core or the like.
(See FIG. 1) and radiates heat from the caliper body 3 to the outside air, so that the coil temperature (coil temperature T _U , coil temperature T _V and coil temperature T _W ) finally becomes equal to the ambient temperature (ambient temperature). . However, the temperature around the brake caliper (caliper body 3) of the automobile is unstable. Therefore, the temperature of the neutral point 98 (neutral point temperature T _S ) of the motor coil (coils 70U, 70V, 70W) is measured by the temperature sensor 95A. The neutral point 98 of the motor coil (coils 70U, 70V, 70W) is the collective point of the coils of each phase (coils 70U, 70V, 70W),
The temperature of the neutral point 98 (neutral point temperature T _S ) changes according to the effective current I _M of the motor 12A. The coil of a phase having a large current value has a temperature higher than the neutral point temperature T _S , the temperature of the coil having a small current value becomes lower than the neutral point temperature T _S , and the coil temperature (coil temperature T _U , coil temperature T _V and coil temperature T _W ) change depending on the current value centering on the neutral point temperature T _S.

In FIG. 11, after the energization of the motor 12A is started [time t1], the energization is stopped after a predetermined time [time t].
2] A state of temperature changes of the motor coil, the neutral point 98, and the brake caliper (caliper body 3) in the case 2) is shown.
The coil temperature of the motor shown in FIG. 11 is 70U, 70V, 70W.
Of these, the coil with the highest current value (here, coil 70
U ) Is a diagram obtained for the purpose of the operation of the electric disc brake device 1D, the brake caliper (caliper body 3) and the coils 70U, 70V, 70
The temperatures of W are the same, and at time t1 in FIG.
When energized with the
70 U), the neutral temperature T _S rises. The difference between the coil temperature and the neutral point temperature T _S increases with time.
On the other hand, the temperature rise of the brake caliper (caliper main body 3) is very small (the angle is slightly inclined with respect to the horizontal axis). When the energization is stopped at time t2 in FIG. 11,
The temperature of the coil (coil 70U in this case) and the neutral point temperature T _S become close to each other while decreasing. On the other hand, the temperature of the brake caliper (caliper body 3) is determined by the coil (here, the coil
Since the heat flows from 70U), the temperature rise continues. In this case also, the brake caliper (caliper body 3)
The change in temperature rise is small as shown in FIG.

The contents of the coil temperature calculation executed by the coil temperature calculator 110 will be described with reference to the flowchart of FIG. The controller 62A is configured to perform calculation at a predetermined control cycle, and the coil temperature calculation unit 110 provided in the controller 62A first inputs the neutral point temperature T _S detected by the temperature sensor 95A (step S1). ). Next, the coil temperature T _U of the U-phase coil 70U, the coil temperature T _V and W-phase coil 70W of the coil temperature T _W of the V-phase coil 70 V, and substituting the neutral point temperature T _S (step S2) Prepare for the calculation of steps S5, S6, and S7 described later. Next, the current sensor (U-phase current sensor 102
U and V phase current sensor 102V and W phase current sensor 102
Coil current of U-phase coil 70U as measured respectively by W) I _U, the coil current of the V-phase coil 70 V I _V and the W-phase coil 7
A coil current I _{W of} 0 _W is input (step S3).

In step S4 following step S3, the motor effective current I _M is calculated based on the coil currents I _U , I _V and I _W. The motor effective current I _M is “(1/3)
× (I _U ² + _IV ² + I _W ² ) ”.

Subsequent to step S4, the temperature rise with respect to the neutral point 98 of the U-phase coil 70U and the coil temperature T _U of the U-phase coil 70U are calculated (step S5). The coil temperature rise ΔT _U of the U-phase coil 70U is equal to 2 of the coil current I _U.
The temperature rise ΔT _S at the neutral point 98 is proportional to the square of the square of the motor effective current I _M. Then, the temperature rise of the U-phase coil 70U with respect to the neutral point 98 (referred to as a reference temperature rise for convenience in order to distinguish it from the temperature rise in consideration of a change in the amount of transmission to be described later) ΔT _ZU is obtained by the following equation (31). To be

ΔT _ZU = (k ₁ I _U ² −k ₂ I _M ² ) Δt (31) Here, k ₁ and k ₂ are proportional constants, and the neutral point 98 and the coil where the temperature is measured are both k ₁ for the heat capacity is different from that of the
And k ₂ are different.

When a temperature difference occurs between the coil and the neutral point 98, the amount of heat transfer between the coil and the neutral point 98 increases (changes). Considering the influence of the temperature difference [change in transmission amount], the temperature rise ΔT of the coil with respect to the neutral point 98
_U becomes as shown in the following expression (32).

[0088] _{ΔT U = ΔT ZU -k 3 (} T U -T S) Δt = (k 1 I U 2 -k 2 I M 2) Δt-k 3 (T U -T S) 2 Δt ... (32) k ₃ is a constant of proportionality.

Coil temperature calculation unit 110 (controller 62A)
In step S5, the following equation (33) is further calculated, and the temperature rise ΔT _U of the coil is added to the coil temperature T _U of the U-phase coil 70U in which the neutral point temperature T _S is substituted in step S2. Then, the temperature rise value ΔT _U of the U-phase coil 70U with respect to the neutral point 98 is added to the temperature sensor 95A.
The detected value (coil temperature T _U )] of the U-phase coil 7
The coil temperature T _{U of} 0U is obtained.

T _U = ΔT _U + T _S (33)

Similar to the calculation of the coil temperature T _U of the U-phase coil 70U performed in step S5, the equations (34) and (35) are calculated in step S6 to obtain the V-phase coil 70V.
Calculate the coil temperature T _V of

ΔT _V = (k ₁ I _V ² −k ₂ I _M ² ) Δt−k ₃ (T _V −T _S ) ² Δt (3 4) T _V = ΔT _V + T _S (3 5)

In step S7 subsequent to step S6, the operations of equations (36) and (37) are performed, and the W-phase coil 70
The coil temperature T _W of _W is calculated.

[0094] _{ΔT W = (k 1 I W} 2 -k 2 I M 2) Δt-k 3 (T W -T S) 2 Δt ... (36) T W = ΔT W + T S ... (37)

In step S8 following step S7, it is determined whether or not the key (ignition key) of the vehicle is turned off. When it is determined in step S8 that the key is not turned off (No), the process returns to step S3 and the above steps are executed. The key is turned off in step S8 (Yes
If it is determined to be s), the process of the coil temperature calculation unit 110 ends.

According to the fifth embodiment configured as described above, the temperature sensor 95A measures the neutral point temperature T _S while the coil current I detected by the U-phase current sensor 102U.
Calculated temperature rise value [Delta] T _U of the U-phase coil 70U from the _U, obtaining the coil temperature T _U of the U-phase coil 70U by adding the temperature rise value [Delta] T _U neutral point temperature T _S. Further, in the same manner as the calculation of the coil temperature T _U of the U-phase coil 70U, obtains the coil temperature T _V and W-phase coil temperature T _W of the coil 70W of V-phase coil 70 V.
Therefore, compared with the case where the temperature of the coil is estimated only by the temperature of the neutral point using one temperature sensor, the coil of each phase (U-phase coil 70U, V-phase coil 70V, W-phase coil 70W) Temperature [coil temperature T _U , coil temperature T _V, and coil temperature T
_W ] can be detected with higher accuracy. Further, since only one temperature sensor 95A is required, the wiring for the temperature sensor 95A and the wiring assembling work can be reduced, and the handleability can be improved. When the brake is not applied, the estimated temperature of the coil approaches the temperature sensor value measured over time, so the error in the estimated temperature of the coil with respect to the actual coil temperature is large regardless of the passage of time. It doesn't become.

In the fifth embodiment, the case where the temperature sensor 95A is provided at or near the neutral point 98 has been described as an example, but instead of this, the temperature sensor 95A may be configured as shown in FIGS. 13 and 14. (Sixth embodiment). Motor of this sixth embodiment
The 12B is housed in the caliper body 3 (see FIG. 1). In this motor 12B, the caliper body 3 (see FIG. 1)
U phase lead wire 100U, V phase lead wire 100V and W
100W of phase lead wires are bundled together, and this U-phase lead wire 100U, V
A temperature sensor 95A is provided at a portion (lead wire bundle portion) 120 where the phase lead wire 100V and the W phase lead wire 100W are bundled. Then, similarly to the fifth embodiment, the motor effective current I _M is obtained, and U is calculated by using the motor effective current I _M.
Coil temperature T _U of the phase coils 70U, is to obtain the coil temperature T _V and W-phase coil temperature T _W of the coil 70W of V-phase coil 70 V. In the sixth embodiment, the temperature sensor 95
A and coil lead wire (U phase lead wire 100U, V phase lead wire 1
00V and W-phase lead wire 100W), as shown in FIG.
While they are placed in contact with each other, they are fixed by a mold 121 so as not to shift from each other. Also in the sixth embodiment, the coil temperature T _U of the U-phase coil 70U and the coil temperatures T _V and W of the V-phase coil 70V are the same as in the fifth embodiment.
Coil temperature T _W of the phase coil 70W is required.

Therefore, compared with the case where the temperature of the coil (U-phase coil 70U, V-phase coil 70V, W-phase coil 70W) is estimated with only one temperature sensor, the coil of each phase (U-phase coil 70U) is estimated. , V-phase coil 70V, W-phase coil 70W) [coil temperature T _U , coil temperature T _V and coil temperature T _W ] can be detected with higher accuracy. Also, the temperature sensor 95A
Since only one is required, the wiring and assembling work for the temperature sensor 95A can be reduced, and the handleability can be improved.

[0099]

According to the invention described in any one of claims 1 to 3, the temperature sensors arranged in the coils of a plurality of phases are connected in series or in parallel, and the temperature information of the temperature sensors of each phase is obtained. Since the motor temperature information is output to the controller via the two lead wires, it is possible to prevent overheating, and the leader wire for the controller is suppressed to two to prevent the motor from overheating. It is easy to bend, and eventually the occurrence of wire breakage can be suppressed, and the lead wire can be easily drawn around.

According to the fourth aspect of the present invention, the vicinity of the neutral point or the lead wire detected by the temperature sensor provided in the vicinity of the neutral point or in the lead wire bundling portion in which the lead wires of the coils of the plurality of phases are bundled The temperature of each coil of multiple phases is calculated by adding the temperature rise value of the coil relative to the neutral point obtained based on the coil current detected by the current sensor or the bundle of lead wires to the detected temperature of the coil. It is possible to detect the coil temperature of each phase with higher accuracy compared to the estimation of the coil temperature based on the detected temperature only. Also,
Since only one temperature sensor is required, the wiring for the temperature sensor and the wiring assembling work can be reduced, and the handleability is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an electric disc brake device according to a first embodiment of the present invention.

FIG. 2 is a side view showing the device of FIG. 1 partially broken away.

FIG. 3 is a plan view showing the apparatus of FIG. 1 with a part thereof cut away.

FIG. 4 is a front view showing the device of FIG. 1 partially broken away.

5 is a circuit diagram showing a controller of the electric disc brake device of FIG. 1. FIG.

6 is a diagram showing temperature-resistance value characteristics of an NTC thermistor used in the controller of FIG.

FIG. 7 is a diagram showing a calculation example of a temperature detection error of the NTC thermistor 95 in a table format.

FIG. 8 is a circuit diagram showing a controller used in the electric disc brake device according to the second embodiment of the present invention.

9 is a diagram showing temperature-resistance value characteristics of a PTC thermistor used in the controller of FIG.

FIG. 10 is a diagram schematically showing an electric disc brake device according to a fifth embodiment of the present invention.

FIG. 11 is a coil for energizing and stopping the motor,
It is a figure which shows the neutral point and the temperature change of a brake caliper.

12 is a flowchart showing the contents of calculation by the controller of FIG.

FIG. 13 is a diagram schematically showing an electric disc brake device according to a sixth embodiment of the present invention.

FIG. 14 is a diagram schematically showing an arrangement state of the lead wire and the temperature sensor of FIG.

[Explanation of symbols]

12 motor 62 Main Controller (Controller) 63 Motor driver (controller) 91 Comparator 70U, 70V, 70W U-phase, V-phase, W-phase coil 89a 1st leader line (leader line) 89b Second leader line (leader line) 95 NTC Thermistor 96 PTC thermistor

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3D048 BB02 CC49 HH18 HH58 HH66                       RR13                 3D049 BB02 CC07 HH45 HH47 HH51                       RR06                 3J058 AA43 AA48 AA53 AA69 AA78                       AA87 BA35 BA46 BA60 DB25                       FA01

Claims (4)

[Claims] 1. An electric disc brake device comprising a disc brake main body for generating a braking force by the operation of a motor having coils of a plurality of phases supplied with electric power from a controller, wherein a temperature sensor is provided for each coil of the plurality of phases. A plurality of temperature sensors are connected in series or in parallel to form two lead wires, and motor temperature information is output to the controller via the two lead wires. . 2. The electric disc brake device according to claim 1, wherein the temperature sensor is an NTC thermistor, and the temperature sensor is connected in parallel. 3. The electric disc brake device according to claim 1, wherein the temperature sensor is a PTC thermistor, and the temperature sensor is connected in series. 4. An electric disc brake device comprising a disc brake main body for generating a braking force by the operation of a motor having coils of a plurality of phases supplied with electric power from a controller, wherein ends of the coils of the plurality of phases are connected. A temperature sensor provided in the vicinity of the neutral point or in a lead wire bundling portion where the lead wires of the coils of the plurality of phases are bundled; and a current sensor that detects a coil current flowing through the coils of the plurality of phases, respectively, The controller adds a relative temperature increase value to a neutral point or a lead wire bundling portion of a coil of a plurality of phases obtained on the basis of a coil current detected by each of the current sensors to a detection value of the temperature sensor to obtain a plurality of phases. An electric disc brake device comprising a coil temperature calculation unit for calculating the temperature of each coil.