JP2005247227A - Hydraulic control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress a magnetic influence of a rotor on a position sensor, in a brake hydraulic pressure controlling device. <P>SOLUTION: The brake hydraulic pressure controlling device is provided with the position sensor composed of a housing in which a pump is disposed, a motor fixed on a first side surface of the housing and driving the pump by a rotating shaft, a detected member fixed to the rotating shaft of the motor at a position sandwiching the pump, and a detecting member fixed on the housing side at a position opposite to the detected member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hydraulic pressure control device, and more particularly to a hydraulic pressure control device including a hydraulic pressure control unit using a brushless motor.

As a hydraulic pressure control device, a technique described in Patent Document 1 is disclosed. In the technology described in this publication, in a brake hydraulic pressure control unit using a brushless motor, the rotor position of the brushless motor is detected by a rotation sensor arranged in the vicinity of the rotor.
JP-A-10-129445 (see FIG. 6).

  However, the above-described brake fluid pressure control device has the following problems. That is, since the rotation sensor for detecting the rotor position is arranged close to the rotor, the magnetic disturbance of the rotor may affect the detection accuracy of the position sensor, and the detection accuracy may be reduced. Although shielding to prevent magnetic influences can be considered, there is a problem that the cost is increased.

  The present invention has been made paying attention to the above problem, and an object of the present invention is to suppress the magnetic influence of the rotor on the position sensor in the hydraulic pressure control device.

  In order to achieve the above object, in a hydraulic control device, a housing in which a pump is disposed, a motor fixed to a first side surface of the housing and driving the pump by a rotating shaft, and the pump interposed therebetween A detection member fixed to the rotation shaft of the motor, and a detection member fixed to the housing side and detecting the position of the detection member. A position sensor consisting of

  Therefore, it becomes possible to arrange | position the position sensor and the position of a rotor apart, and the magnetic influence of the rotor with respect to a position sensor can be suppressed.

  Hereinafter, the best mode for realizing the hydraulic pressure control device of the present invention will be described based on Example 1 shown in the drawings.

  FIG. 1 is a diagram illustrating a brake fluid pressure control unit according to the first embodiment. A motor mounting surface 14 for mounting a pump driving motor 6 is provided on the upper surface of the block 1 in FIG. A case mounting surface 15 for mounting the electromagnetic valve 3 and a case 17 covering the electromagnetic valve 3 is provided on the lower surface of the block 1 facing the motor mounting surface 14. The motor 6 is a brushless motor, and is provided with a motor flange portion 6a that supports the motor drive shaft 6b and can be fixed by the block 1 and the bolt 6c.

  The motor mounting surface 14 is provided with a motor mounting hole 11 that fits the block 1 with the motor flange portion 6a and accommodates the connecting portion 8 that connects the motor drive shaft 6b and the pump drive shaft 10a. A small-diameter seal hole 11 a and a smaller-diameter bearing hole 11 b are provided on the bottom surface of the motor mounting hole 11. The seal hole 11a is provided with an oil seal 9a that seals the pump drive shaft 10a so as to be able to rotate and slide, and the bearing hole 11b is provided with a bearing that rotatably supports the pump drive shaft 10a.

  The case mounting surface 15 is provided with a cylinder hole 12 for housing the pump 2 and a sub-block 7 which is a lid of the cylinder hole 12 and houses the position sensor 4. A plurality of solenoid valves 3 that achieve brake control are press-fitted and fixed.

  On the lower surface of the sub-block 7, an accommodation hole 7a for accommodating the position sensor 4, a small-diameter seal hole 7b provided on the bottom surface of the accommodation hole 7a, and a smaller-diameter bearing hole 7c are provided. An oil seal 9b for slidably sealing the pump drive shaft 10a is provided in the seal hole 7b, and a bearing for rotatably supporting the motor drive shaft 10a is provided in the bearing hole 7c. In the receiving hole 7a of the sub block 7, a rotor position detected member 4b that is fixed to the end of the pump drive shaft 10a and rotates integrally with the pump drive shaft 10a is disposed. It is a position facing the rotor position detected member 4b, and is covered from the lower surface side by a lid 7d to which the rotor position detecting member 4a of the position sensor 4 is fixed.

  The position sensor 4 according to the first embodiment is a magnetic sensor including a rotor position detected member 4b in which a plurality of magnets are arranged and a rotor position detecting member 4a that detects a change in magnetic flux of the plurality of magnets. The position of the motor drive shaft 6b is detected based on the change in magnetic flux according to the rotational position. However, the position is not particularly limited as long as the position is detected in accordance with an electrical and magnetic change.

  Further, a case member 17 that covers the sub block 7 and the electromagnetic valve 3 is provided on the case mounting surface 15. A cover 18 that covers the control unit 5 is provided on the lower surface of the case member 17. The rotor position detection member 4a is connected to the control unit 5 at the electrical connection portion 19 via the output line 4c. In addition, the electromagnetic valve 3 is connected to the control unit 5 through an electrical connection portion 16.

  That is, in the brake fluid pressure control unit of FIG. 1, the position sensor 4 for detecting the rotational position of the motor drive shaft 6b of the motor 6 is arranged on the side facing the motor 6 with the gear pump 2 interposed therebetween. Yes. As a result, the position sensor 4 can be disposed at a position away from the motor 6, and the position sensor 4 is less susceptible to the magnetic influence of the motor 6, so that it is possible to suppress a decrease in detection accuracy of the rotor position. .

  Further, it is not necessary to newly provide a shield, and the magnetic influence of the rotor on the rotor position detection member 4a can be suppressed, so that an increase in cost can be suppressed.

  Further, the motor 6 is attached to the motor attachment surface 14 of the block 1, and the pump 2 is assembled from the opposite case attachment surface 15 side. Therefore, it is possible to perform positioning using the block 1 as a counter, and it is possible to configure a highly accurate unit without separately providing a positioning pin or the like.

[For front wheel side hydraulic unit]
FIG. 2 is a diagram illustrating a front wheel side hydraulic unit according to the first embodiment. The front wheel side hydraulic unit includes a left wheel side hydraulic unit L / U and a right wheel side hydraulic unit R / U. When control is performed by a gear pump (not shown), when the pressure is increased, the brake fluid is supplied from the reservoir tank 24 to the gear pump (not shown) of the hydraulic unit of the left and right wheels via the oil passage 60 → the oil passage 63. Is done. The left wheel side hydraulic unit L / U and the right wheel side hydraulic unit R / U are connected via an oil passage 64. At the time of depressurization, the brake fluid is returned to the reservoir tank 24 via the oil passage 65 → the oil passage 62.

[Hydraulic circuit and control of front wheel side hydraulic unit]
FIG. 3 is a hydraulic circuit diagram on the front wheel side in the first embodiment. The configuration will be described below.

  When the brake pedal 22 is depressed, hydraulic pressure is generated in the master cylinder 23. The master cylinder 23 is a so-called tandem type, and can supply the same hydraulic pressure to the left wheel side system supplied via the oil passage 46 and the right wheel side system supplied via the oil passage 47 independently. It is. The master cylinder 23 is provided with a reservoir tank 24 for storing brake fluid.

  A shutoff valve 26 is provided on the oil passage 46. A shutoff valve 27 is provided on the oil passage 47. Here, the shutoff valves 26 and 27 are electromagnetic valves.

  A wheel cylinder 28 (FL) is provided on the oil passage communicating from the shutoff valve 26 to the oil passage 46 → the oil passage 48. A wheel cylinder 29 (FR) is provided on the oil passage communicating from the shutoff valve 27 to the oil passage 47 → the oil passage 49.

  A gear pump 30 is provided on the oil passage 58. A gear pump 31 is provided on the oil passage 59. The gear pumps 30 and 31 are driven by pump motors 32 and 33 based on a command value from the control unit 5. In the present embodiment, the gear pumps 30 and 31 are provided for each wheel, but the configuration may include only one hydraulic pressure source, and is not particularly limited.

  One-way valves 38 and 39 are provided in series with the gear pumps 30 and 31. This is to prevent the hydraulic pressure from returning to the gear pumps 30 and 31 side by providing the one-way valves 38 and 39 when the gear pumps 30 and 31 are driven to supply a necessary amount of hydraulic pressure. Accordingly, the hydraulic pressure can be maintained without further driving the gear pumps 30 and 31, and the hydraulic pressure can be supplied by driving the minimum necessary gear pumps 30 and 31.

  A pressure reducing valve 34 is provided on the oil passage 54. A pressure reducing valve 35 is provided on the oil passage 55. Here, the pressure reducing valves 34 and 35 are electromagnetic valves. When not energized, the shutoff valves 26 and 27 are opened, and the pressure reducing valves 34 and 35 are closed. When the brake pedal 22 is depressed in this state (when pressure is increased), pressure is generated in the master cylinder 23. The pressure generated in the master cylinder 23 is transmitted to the wheel cylinder 28 in the order of the oil passage 46 → the shut-off valve 26 → the oil passage 48. Further, the oil is transmitted to the wheel cylinder 29 in the order of the oil passage 47 → the shut-off valve 27 → the oil passage 49.

  Further, at the time of pressure reduction, a control current is sent from the control unit 5 to the pressure reducing valves 34 and 35 to control the valve opening amounts of the pressure reducing valves 34 and 35, thereby allowing the wheel cylinders 28 and 29 to pass through the oil passages 50 and 51. The pressure reduction control is performed.

(Brake-by-wire control)
In this embodiment, the front wheel side can perform so-called brake-by-wire control. That is, when the IGN is turned ON by the driver's key operation, the shutoff valves 26 and 27 are closed. Then, the driver's intention to operate the brake is detected from the master cylinder pressure or the like, and a desired brake fluid pressure is generated by the gear pumps 30 and 31 according to the intention and the traveling situation. The intention to operate the brake can be detected by a master cylinder pressure sensor, a stroke sensor, or the like, but is not limited thereto, and other means may be used. The desired brake fluid pressure is detected by the wheel cylinder pressure sensors 40 and 41.

  Further, when the driver depresses the brake pedal 22 and braking force is input to the front wheel side wheel cylinders 28 and 29, when wheel lock is detected by a wheel speed sensor or the like, the front wheel side wheel cylinder pressure is increased. By controlling, ABS control can be performed. That is, the shutoff valves 26 and 27 are closed and the pressure reducing valves 34 and 35 are opened to reduce the pressure, and the pressure reducing valves 34 and 35 are closed to maintain the hydraulic pressure, the pump motors 32 and 33, and the gear pump 30, The pressure can be increased by driving 31 and ABS control can be achieved.

  Moreover, when the slip state of the front wheel is detected by a wheel speed sensor or the like, TCS control can be performed by controlling the front wheel side wheel cylinder pressure. That is, the shutoff valves 26 and 27 are closed, the pump motors 32 and 33 and the gear pumps 30 and 31 are driven, and the reservoir tank 24 is passed through the oil passages 46 and 47, the gear pumps 30 and 31, and the oil passages 52 and 53. By increasing the pressure, stopping the pump motors 32, 33 and the gear pumps 30, 31, the hydraulic pressure can be maintained, and the pressure can be reduced by opening the pressure reducing valves 34, 35, and TCS control can be achieved.

  Further, by providing a sensor for detecting the spin direction of the vehicle, such as a yaw rate sensor, and performing the same control as the above TCS control, the spin prevention control can be performed.

  As described above, in the first embodiment, instead of providing the rotor position detected member 4b of the motor 6 on the motor rotating shaft 6b side, the side where the pump driving shaft 10a is fitted to the motor rotating shaft 6b and the gear pump The rotor position detecting member 4a is arranged at a position opposite to the rotor position detected member 4b. Thereby, since the rotor position detection member 4a becomes difficult to receive the magnetic influence of the rotor of the motor 6, the fall of the detection accuracy of a rotor position can be suppressed. Moreover, since the magnetic influence which a rotor exerts on the rotor position detection member 4a can be suppressed without newly providing a shield, an increase in cost can be suppressed (corresponding to claim 1).

  The rotor position detection member 4a is composed of a plurality of elements, and is disposed on the case mounting surface 15 side of the block 10, and a control unit 5 for driving the motor 6 is disposed in the vicinity of the rotor position detection member 4a. The output line 4c of the rotor position detection member 4a is connected to the control unit 5. As a result, the plurality of output lines 4c can be connected at close positions, and the connection is facilitated. Further, since the output line 4c is shortened and disturbance can be suppressed, it is possible to prevent a decrease in detection accuracy of the rotor position.

  Further, since the solenoid valve 3 and the control unit 5 for switching the oil passage of the fluid discharged from the gear pump 2 are disposed on the case mounting surface 15 side, the solenoid valve 3 and the control unit 5 are disposed in proximity to each other. Therefore, the electrical connection between the electromagnetic valve 3 and the control unit 5 can be easily performed.

  FIG. 4 is a diagram illustrating a brake fluid pressure control unit according to the second embodiment. Since the basic configuration is the same as that of the brake fluid pressure control unit of FIG. 1 according to the first embodiment, only different parts will be described.

  In the brake fluid pressure control unit of FIG. 1, the rotor position detection member 4a is attached to the pump drive shaft 10a. On the other hand, in the brake fluid pressure control unit shown in FIG. 4, the rotor position detection member 4a is attached to the end of the pump driven shaft. Here, in FIG. 4, the pump driven shaft 10b can be configured by disposing the pump drive shaft 10a in the up-down direction reversely. That is, common components can be used for the pump drive shaft 10a and the pump driven shaft 10b. As a result, the number of parts can be reduced, and the cost can be reduced. The hydraulic pressure control device of the present invention may be used for a hydraulic pressure control unit of a power steering device in addition to a brake hydraulic pressure control unit.

  Further, technical ideas other than the claims that can be grasped from the respective embodiments will be described below together with the effects thereof.

(A) In the brake fluid pressure control device according to claim 1,
The position sensor includes a plurality of elements and is disposed on a second side surface corresponding to the first side surface of the housing, and a motor drive control unit is disposed in the vicinity of the position sensor. The brake fluid pressure control device is characterized in that the output line of is connected to a control unit.

  Since the rotor position detection member 4a can connect the plurality of output lines 4c at close positions, the connection is easy, and since the output line 4c is short, the rotor position detection member 4a is less susceptible to disturbances and the rotor position detection accuracy is lowered. Can be prevented.

(B) In the brake fluid pressure control device according to claim 1 or (A),
A brake hydraulic pressure control device, wherein an electromagnetic valve for switching an oil passage of fluid discharged from the pump is disposed on the second side surface, and the second side surface and the control unit are connected.

  Since the solenoid valve 3 and the control unit 5 are arranged close to each other, the solenoid valve 3 and the control unit 5 can be easily connected.

It is a figure showing the brake fluid pressure control unit in Example 1. FIG. 3 is a diagram illustrating a front wheel side hydraulic unit in the first embodiment. 1 is a hydraulic circuit diagram of a front wheel side hydraulic unit in Embodiment 1. FIG. It is a figure showing the brake fluid pressure control unit in Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Block 2 Gear pump 3 Solenoid valve 4 Position sensor 4a Rotor position detection member 4b Rotor position detected member 4c Output line 5 Control unit 6 Motor 6a Motor flange part 6b Motor drive shaft 6c Bolt 7 Subblock 7a Mounting hole 7b Seal hole 7c Bearing hole 7d Lid 8 Connecting portion 9a, 9b Oil seal 10a Pump drive shaft 10b Pump driven shaft 11 Motor mounting hole 11a Seal hole 11b Bearing hole 12 Cylinder hole 14 Motor mounting surface 15 Case mounting surface 16 Electrical connection portion (electromagnetic valve) side)
17 Case 18 Cover 19 Electrical connection (rotor position detection side)
22 Brake pedal 23 Master cylinder 24 Reservoir tank 25 Brake switch 26, 27 Shut-off valve 28 Wheel cylinder (FL)
29 Wheel cylinder (FR)
30, 31 Gear pump 32, 33 Pump motor 34, 35 Pressure reducing valve 38, 39 One-way valve 40, 41 Wheel cylinder pressure sensor
L / U Left wheel side hydraulic unit
R / U right wheel side hydraulic unit

Claims (1)

A housing with a pump inside,
A motor fixed to the first side surface of the housing and driving the pump by a rotating shaft;
A position to be opposed to the motor across the pump, and a detected member fixed to the rotating shaft of the motor;
A detection member which is a position facing the member to be detected and is fixed to the housing side and detects the position of the member to be detected;
A hydraulic pressure control device comprising a position sensor comprising:

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