CN112947612A - Pressure control device, brake system, and pressure control method - Google Patents
Pressure control device, brake system, and pressure control method Download PDFInfo
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- CN112947612A CN112947612A CN202110158260.1A CN202110158260A CN112947612A CN 112947612 A CN112947612 A CN 112947612A CN 202110158260 A CN202110158260 A CN 202110158260A CN 112947612 A CN112947612 A CN 112947612A
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D16/20—Control of fluid pressure characterised by the use of electric means
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Abstract
The invention discloses a pressure control device, a brake system and a pressure control method, and belongs to the field of pressure control. The pressure control device comprises a power source transmission device and a pressure source, wherein the pressure source comprises a piston and a cylinder body, the piston is connected with the transmission device, the power source is directly driven and connected with the transmission device, the transmission device is a single-bearing supporting structure, and the transmission device converts the rotating force of the power source into linear motion force to enable the piston of the pressure source to do reciprocating linear motion along the axis direction of the transmission device. This application directly drives transmission's mode through the power supply, has simplified the driving chain, compare with prior art's planetary gear reduction mechanism and can improve mechanical transmission efficiency by 20%, it is big to have solved planetary gear reduction mechanism degree of overlap low noise to and the problem that the system developments build the pressure time lag, the single bearing structure of adoption, under the circumstances of guaranteeing axial bearing capacity, the excessive location principle problem and the noise problem that the front end bearing brought have been eliminated, the cost is reduced simultaneously.
Description
Technical Field
The invention belongs to the field of pressure control, and particularly relates to a pressure control device, a brake system and a pressure control method.
Background
The pressure control unit mainly comprises the following structures: the motor drives the ball screw nut to rotate through driving the planetary gear speed reducing mechanism to push the screw rod to move horizontally, the screw rod and the piston are of an integrated structure, and finally the piston is driven to move forwards or backwards so as to control the pressure unit to pressurize and decompress, and the three defects are as follows: firstly, compared with direct drive connection, the mechanical transmission efficiency of the planetary gear speed reducing mechanism is reduced by 20%, and the torque of a driving motor needs to be increased when the same axial force is obtained at the output end; secondly, the problem of higher noise during working is solved due to the low contact ratio of the planetary gear speed reducing mechanism; and thirdly, the low contact ratio of the planetary gear speed reducing mechanism also sacrifices the real-time property of the transmission mechanism for responding to the pressure requirement of the system, and the problem of time lag of dynamic pressure build of the system exists.
The technical scheme that a power source directly drives a transmission device is adopted to an existing cancellation planetary gear, a screw is used for driving a piston to do reciprocating linear motion, the planetary gear speed reducing mechanism is limited to the screw, a radial bearing is required to be arranged at one end of the screw, a radial bearing and a plane bearing are arranged at the other end of the screw, the two radial bearings provide radial supporting force for two ends of the screw, the plane bearing mainly provides axial supporting force for the screw, but the three bearings all have requirements on the centrality of the screw, and the problem of excessive support can be caused, and the problem that the three bearings excessively support the screw again is solved: firstly, a mounting gap needs to be reserved when the bearing is mounted so as to adapt to the machining error of a nut, and a gap which generates noise when the bearing works is caused; secondly, the bearing is a noise source and has the same noise problem; thirdly, the problem of high processing and assembling difficulty exists in over-positioning.
Disclosure of Invention
The purpose of the invention is as follows: a pressure control device, a brake system and a pressure control method are provided to solve the above problems in the prior art.
The technical scheme is as follows: the pressure control device includes:
and the power source outputs power.
And the transmission device is connected with the power source.
And the pressure source comprises a piston and a cylinder body, and the piston is connected with the transmission device.
The power source is directly driven and connected with the transmission device, the transmission device is of a single-bearing supporting structure, and the transmission device converts the rotating force of the power source into linear motion force so that the pressure source piston does reciprocating linear motion along the axis direction of the transmission device.
In a further embodiment, the transmission comprises a hollow shaft, which is driven in rotation by the power source.
And the bearing is supported at one end of the hollow shaft.
And the screw rod is connected with the hollow shaft and extends along the motion direction of the pressure source piston.
The screw is in threaded fit with the screw rod, the screw is connected with the pressure source piston, and the screw reciprocates along the axis direction of the screw rod.
In a further embodiment, the anti-rotation device also comprises an anti-rotation part which is fixedly connected with the pressure source cylinder and is in sleeve fit with the screw rod;
a sliding cavity is arranged in the anti-rotating part, a limiting part is arranged in the sliding cavity of the anti-rotating part, the screw nut is in sliding fit with the limiting part, the limiting part is used for circumferentially limiting the screw nut, the screw rod drives the screw nut through the anti-rotation part, the two ends of the hollow shaft are limited by matching with the power source and one bearing, the problem that the screw nut and the power source are excessively supported by three bearings when the screw nut is used for driving the screw rod in the prior art can be solved, thereby reducing the noise of the bearing during working, solving the problem of high processing and assembling difficulty caused by over-positioning, the nut and the screw rod are limited through the anti-rotating part, the nut is enabled to do reciprocating linear motion and limit the screw rod at the same time, the problem that the nut shakes due to the fact that the eccentric rotation amplitude of the nut gradually increases when the nut moves to the end, far away from the bearing, of the screw rod is avoided, and the problem that the service life of the nut and the service life of a pressure source are low is solved.
In a further embodiment, the pressure source further comprises:
the sealing element is fixedly arranged at one end, close to the transmission device, in the pressure source cylinder body, the pressure source piston is in sealing fit with the sealing element, the sealing element is arranged on the pressure source cylinder body, and the sealing structure of the pressure source cylinder body is used, so that the electromechanical liquid servo system is guaranteed to meet the requirement of durability and is matched with the service life of the whole vehicle.
In a further embodiment, the limiting portion is at least one protrusion extending along the central axis of the anti-rotation member from the end of the anti-rotation member near the nut toward the piston of the pressure source.
The outer wall of the nut is provided with a sliding groove in sliding fit with the limiting part.
In a further embodiment, the limiting portion is at least one groove extending from one end of the anti-rotation member close to the nut to the direction of the piston of the pressure source along the central axis of the anti-rotation member.
The outer wall of the screw is provided with a sliding block, and the sliding block is in sliding fit with the limiting part.
In a further embodiment, the pressure control device further comprises an electromagnetic induction type angle sensor comprising a sensor rotor for fixed connection with the power source rotor for rotation therewith.
And the sensor induction circuit board is fixedly connected with the power source winding wire holder and is in sleeve joint fit with the sensor rotor to detect the rotation angle of the sensor rotor.
The signal processing circuit board is used for being fixedly connected with a winding wire holder of a power source, the signal processing circuit board is electrically connected with the sensor sensing circuit board and the power source winding wire holder and used for outputting the rotation angle of the sensor rotor and sending an electric signal to the power source winding wire holder to control the rotation angle of the power source rotor, the real-time angle, namely the position, of the power source rotor is measured through the electromagnetic sensing type angle sensor, the position of a pressure source piston in a pressure source cylinder body is controlled through controlling the rotation angle of the power source rotor to achieve pressure control, the electromagnetic sensing type angle sensor has low requirements on the environment, the signal temperature under high temperature and vibration conditions is high in anti-jamming capability, and the problems that the Hall type motor angle sensor in the prior art has high requirements on the environment, the signal error is large under high temperature.
The pressure control device-based brake system includes: pressure control means for providing braking force to the wheel brakes;
the controller is electrically connected with the pressure control device and is used for controlling the pressure output quantity of the pressure control device;
and one end of the hydraulic loop is communicated with a pressure source of the pressure control device, and the other end of the hydraulic loop is communicated with the wheel brake and used for transmitting brake oil and braking force.
The pressure control method based on the pressure control device comprises the following steps: and S1, when the brake system needs to be pressurized, the power source drives the screw rod to rotate in the positive direction, so that the screw nut and the pressure source piston move along the central axis of the screw rod in the direction away from the power source, and oil in the pressure source cylinder is sent into the brake system to pressurize the brake system.
And S2, when the brake system needs to be decompressed, the power source drives the screw rod to rotate reversely, so that the screw nut and the pressure source piston move along the central axis of the screw rod in the direction close to the power source, and oil in the brake system is sucked into the pressure source cylinder body to reduce the pressure of the brake system.
In a further embodiment, the pressure control method based on the pressure control device further comprises: and S3, when the brake system needs to be pressurized or depressurized, the signal processing circuit board sends an electric signal to the power source winding wiring base, so that the power source rotor rotates for a preset angle.
And S4, when the power source rotor rotates, the sensor sensing circuit board detects the rotation angle of the power source rotor.
Has the advantages that: the invention discloses a pressure control device, a brake system and a pressure control method, wherein a transmission device is directly driven by a power source, a transmission chain is simplified, the rotating force of the power source is converted into linear motion force to drive a pressure source piston to do reciprocating linear motion along the axis direction of the transmission device, the mechanical transmission efficiency can be improved by 20% compared with the planetary gear speed reducing mechanism in the prior art, the problems of low contact ratio, high noise and lag of system dynamic pressure building time of the planetary gear speed reducing mechanism are solved, the problem of the principle of over-positioning and the noise caused by a front end bearing is eliminated under the condition of ensuring the axial bearing capacity by adopting a single bearing supporting structure, and the cost is reduced.
Drawings
Fig. 1 is a comparison of a prior art planetary gear scheme.
Fig. 2 is a comparison of a prior art pressure source piston and screw integration scheme.
Fig. 3 is an assembly schematic of the present invention.
FIG. 4 is a cross-sectional view of the anti-rotation member and nut of the present invention.
The reference numerals shown in fig. 1 to 4 are: the device comprises a pressure source cylinder 1, a pressure source piston 2, a main leather cup 3, an auxiliary leather cup 4, a cylinder outer sealing ring 5, an anti-rotation part 6, a sensor rotor 7, a sensor induction and signal processing circuit board 8, a winding wire holder 9, a power source stator 10, a power source rotor 11, a power source shell 12, a lead screw 13, a screw 14, a hollow shaft 15, a pressing ring 16, a bearing 17, a check ring 18, a rear end cover 19, a connecting screw 20, an end cover sealing ring 21, a limiting part 61 and a planetary gear speed reducing mechanism 100.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
The pressure control unit mainly comprises the following structures: the motor drives the ball screw nut to rotate through driving the planetary gear speed reducing mechanism to push the screw rod to move horizontally, the screw rod and the piston are of an integrated structure, and finally the piston is driven to move forwards or backwards so as to control the pressure unit to pressurize and decompress, and the three defects are as follows: firstly, compared with direct drive connection, the mechanical transmission efficiency of the planetary gear speed reducing mechanism is reduced by 20%, and the torque of a driving motor needs to be increased when the same axial force is obtained at the output end; secondly, the problem of higher noise during working is solved due to the low contact ratio of the planetary gear speed reducing mechanism; and thirdly, the low contact ratio of the planetary gear speed reducing mechanism also sacrifices the real-time property of the transmission mechanism for responding to the pressure requirement of the system, and the problem of time lag of dynamic pressure build of the system exists.
The technical scheme that a power source directly drives a transmission device is adopted to an existing cancellation planetary gear, a screw is used for driving a piston to do reciprocating linear motion, the planetary gear speed reducing mechanism is limited to the screw, a radial bearing is required to be arranged at one end of the screw, a radial bearing and a plane bearing are arranged at the other end of the screw, the two radial bearings provide radial supporting force for two ends of the screw, the plane bearing mainly provides axial supporting force for the screw, but the three bearings all have requirements on the centrality of the screw, and the problem of excessive support can be caused, and the problem that the three bearings excessively support the screw again is solved: firstly, a mounting gap needs to be reserved when the bearing is mounted so as to adapt to the machining error of a nut, and a gap which generates noise when the bearing works is caused; secondly, the bearing is a noise source and has the same noise problem; thirdly, the problem of high processing and assembling difficulty in over-positioning exists, and in order to solve the problem, the applicant develops a pressure control device, a brake system based on the pressure control device and a pressure control method.
The pressure control device includes: the device comprises a pressure source cylinder 1, a pressure source piston 2, a main leather cup 3, an auxiliary leather cup 4, a cylinder outer sealing ring 5, an anti-rotation part 6, a sensor rotor 7, a sensor induction and signal processing circuit board 8, a winding wire holder 9, a power source stator 10, a power source rotor 11, a power source shell 12, a lead screw 13, a screw 14, a hollow shaft 15, a pressing ring 16, a bearing 17, a check ring 18, a rear end cover 19, a connecting screw 20, an end cover sealing ring 21 and a limiting part 61.
The pressure source is used for controlling the pressure of the brake system, the pressure source comprises a pressure source cylinder body 1 and a pressure source piston 2, oil is contained in the pressure source cylinder body 1, and the piston is connected with the transmission device.
The power source comprises a power source shell 12, a winding wire holder 9, a power source stator 10 and a power source rotor 11, wherein the power source shell 12 is fixedly connected with a pressure source cylinder body 1, in the embodiment shown in fig. 3, for the sake of clearly displaying the structure of an assembly drawing, the pressure source cylinder body 1 is a partial schematic view, the winding wire holder 9, the power source stator 10 and the power source rotor 11 are accommodated in the power source shell 12, the power source stator 10 and the winding wire holder 9 are fixedly connected with the power source shell 12, the power source rotor 11 is rotatably connected with the power source stator 10, and the power source rotor 11 rotates around the central shaft of the power source stator 10 to output power.
The power source is directly driven and connected with the transmission device, the transmission device is a single-bearing 17 supporting structure, and the transmission device converts the rotating force of the power source into linear motion force so that the pressure source piston 2 does reciprocating linear motion along the axis direction of the transmission device.
The working principle is as follows: through the mode that the power supply directly drives transmission, the drive chain has been simplified, turn into the revolving force of power supply and make reciprocating linear motion with pressure source piston 2 along transmission's axis direction with the straight line motion power and compare with prior art's planetary gear reduction gears and can improve mechanical transmission efficiency by 20%, it is big to have solved planetary gear reduction gears degree of overlap low noise, and the problem that the time lag is built to the system developments, the single bearing 17 bearing structure of adoption, under the circumstances of guaranteeing axial bearing capacity, the excessive positioning principle problem and the noise problem that front end bearing 17 brought have been eliminated, the cost is reduced simultaneously.
In a further embodiment, the transmission comprises a lead screw 13, a nut 14, a hollow shaft 15 and a bearing 17, wherein the transmission comprises: and the hollow shaft 15 is fixedly connected with the power source rotor and is driven to rotate by the power source.
And a bearing 17 fixedly installed at one end of the inside of the power source housing 12 of the power source and supported at one end of the hollow shaft.
And the screw rod 13 is connected with the hollow shaft and extends along the motion direction of the piston of the pressure source.
And the screw 14 is in threaded fit with the screw rod, the screw is connected with the pressure source piston, and the screw reciprocates along the axial direction of the screw rod.
In a further embodiment, the transmission device further comprises a pressing ring 16, a retainer ring 18, a rear end cover 19, a connecting screw 20 and an end cover sealing ring 21, the connecting screw 20 sequentially penetrates through the retainer ring 18, the bearing 17 and the screw rod 13 and is in threaded fit with the screw rod 13, one end of the connecting screw 20, which is far away from the bearing 17, is accommodated in the rear end cover 19, and the end cover sealing ring 21 is installed between the rear end cover 19 and the power source shell 12.
One end of the outer ring of the bearing 17 is in butt fit with the power source shell 12, the other end of the outer ring is in butt fit with one end of the pressing ring 16, one end of the inner ring of the bearing 17 is in butt fit with the retainer ring 18, and the other end of the inner ring of the bearing 17 is in butt fit with the hollow shaft 15.
One end of the hollow shaft 15 close to the bearing 17 is in plug fit with the bearing 17, so that the outer wall of the hollow shaft 15 is matched with the inner wall of the bearing 17.
The other end of the pressing ring 16 is in abutting engagement with a baffle of the power source housing 12.
Can be close to the one end of pressure source to bearing 17 through hollow shaft 15 and clamping ring 16 and carry on spacingly, can keep away from the one end of pressure source to bearing 17 through power source casing 12 and retaining ring 18 and carry on spacingly, very big simplification power supply and transmission's structure, installation step to and the assembly precision, very big reduction the production degree of difficulty and manufacturing cost.
In a further embodiment, the nut 14 is driven only by the screw rod 13, so that the problem that the nut 14 rotates automatically and cannot do reciprocating linear motion exists, and one end of the screw rod 13, which is far away from the bearing 17, is eccentrically rotated, so that the nut 14 shakes, and the service lives of the nut 14 and the pressure source are reduced.
In order to solve the problems, the pressure control device further comprises an anti-rotation part 6 which is fixedly connected with the pressure source cylinder body 1 and is in sleeve fit with the screw rod 13.
Prevent changeing and to have seted up the slip chamber in 6, prevent changeing the slip intracavity of 6 and be provided with spacing portion 61, screw 14 and spacing portion 61 sliding fit, spacing portion 61 is used for carrying out circumference spacing to screw 14.
Make lead screw 13 drive screw 14 through preventing changeing 6, cooperation power supply and a bearing 17 are spacing to the both ends of hollow shaft 15, can solve and use screw 14 drive lead screw 13 among the prior art and need the problem that three bearing 17 excessively supported screw 14 and power supply, and then reduce the noise of bearing 17 during operation, the problem that processing and the assembly degree of difficulty are high that has still been solved and have crossed the location and lead to is still solved, it is spacing to screw 14 and lead screw 13 through preventing changeing 6, make screw 14 carry out spacingly to lead screw 13 on one side of reciprocating linear motion, because of the eccentric rotation amplitude of screw 14 increases gradually when having avoided screw 14 to move to the one end that bearing 17 was kept away from to lead screw 13 and lead to the problem of screw 14 shake, the problem of screw 14 and pressure source low service life has been solved.
In a further embodiment, a sealing element is mounted on the outer wall of a piston to achieve sealing in the pressure source in the prior art, the sealing element and the inner wall of a cylinder body perform reciprocating friction in the working process of the pressure source, and the volume of the piston is limited by the inner diameter of the cylinder body, so that the contact area and the limiting effect of the piston and the sealing element are limited, and the problem of service life reduction caused by abrasion and falling of the sealing element is easy to occur.
In order to solve the above problem, the pressure source comprises a pressure source cylinder 1.
The pressure source piston 2 has one end housed in the pressure source cylinder 1 and the other end extending to the transmission device through the pressure source cylinder 1.
The sealing element, at least one sealing element, is fixedly arranged at one end of the pressure source cylinder 1 close to the transmission device, the pressure source piston 2 is in sealing fit with the sealing element, and in the embodiment shown in figure 3, the sealing element comprises a main leather cup 3 and an auxiliary leather cup 4 which are fixedly arranged in the pressure source cylinder 1.
The sealing performance is further improved by arranging the cylinder outer sealing ring 5 outside the pressure source cylinder 1.
Through installing the sealing member on the cylinder body, use cylinder body seal structure, guaranteed that electromechanical liquid servo satisfies the durability requirement and makes it and whole car life-span phase-match.
In a further embodiment, as shown in fig. 4, the limiting portion 61 is at least one protrusion extending from an end of the anti-rotation member 6 near the nut 14 to the pressure source piston 2 along the central axis of the anti-rotation member 6, and the protrusion may be arc-shaped as shown in fig. 4, or may be shaped as a rectangle, a prism, a cusp, or the like.
The outer wall of the nut 14 is provided with a sliding groove in sliding fit with the limiting part 61.
In a further embodiment, the limiting portion 61 is at least one groove extending along the central axis of the rotation-preventing member 6 from the end of the rotation-preventing member 6 near the nut 14 toward the pressure source piston 2.
The outer wall of the screw 14 is provided with a sliding block which is in sliding fit with the limiting part 61, and the sliding block can be in an arc shape and also can be in a special shape such as a rectangle, a prism or a sharp angle shape.
In a further embodiment, an angle sensor adopted by the existing pressure control unit is a hall motor angle sensor which has harsh requirements on the environment, and has the problems of large signal error and poor anti-interference capability at high temperature.
In order to solve the above problem, the pressure control device further includes an electromagnetic induction type angle sensor, and the electromagnetic induction type angle sensor includes a sensor rotor 7 for being fixedly connected with the power source rotor 11 and for rotating with the power source rotor 11.
And the sensor induction circuit board is fixedly connected with the power source winding wire holder 9, and is in sleeve joint fit with the sensor rotor 7 and used for detecting the rotation angle of the sensor rotor 7.
And the signal processing circuit board is fixedly connected with a winding wire holder 9 of the power source, is electrically connected with the sensor induction circuit board and the power source winding wire holder 9 and is used for outputting the rotation angle of the sensor rotor 7 and sending an electric signal to the power source winding wire holder 9 to control the rotation angle of the power source rotor 11.
In the embodiment shown in fig. 3, the sensor sensing board and the signal processing board are too thin and too close to each other, so that the sensor sensing board and the signal processing board are denoted by the same reference numeral as the sensor sensing and signal processing board 8.
The measurement of the real-time position of the power source rotor 11, namely the position, is realized through the electromagnetic induction type angle sensor, and the position of a piston of a control pressure source in a cylinder body of the pressure source is realized by controlling the rotation angle of the power source rotor 11, the electromagnetic induction type angle sensor has low requirements on the environment, the signal temperature is high under high temperature and vibration conditions, the anti-interference capability is strong, the problem that the Hall type motor angle sensor in the prior art has harsh requirements on the environment, the signal error is large under high temperature, and the anti-interference capability is poor is solved.
The pressure control device-based brake system includes: and a pressure control device for providing braking force to the wheel brake.
And the controller is electrically connected with the pressure control device and is used for controlling the pressure output quantity of the pressure control device.
And one end of the hydraulic loop is communicated with a pressure source of the pressure control device, and the other end of the hydraulic loop is communicated with the wheel brake and used for transmitting brake oil and braking force.
The pressure control method based on the pressure control device comprises the following steps: s1, when the brake system needs to be pressurized, the power source drives the screw rod 13 to rotate in the positive direction, so that the screw nut 14 and the pressure source piston 2 move along the central axis of the screw rod 13 in the direction away from the power source, and oil in the pressure source cylinder 1 is sent into the brake system to pressurize the brake system.
S2, when the brake system needs to be decompressed, the power source drives the screw rod 13 to rotate reversely, so that the screw nut 14 and the pressure source piston 2 move along the central axis of the screw rod 13 in the direction close to the power source, and oil in the brake system is sucked into the pressure source cylinder 1 to decompress the brake system.
In a further embodiment, the pressure control method based on the pressure control device further comprises: and S3, when the brake system needs to be pressurized or depressurized, the signal processing circuit board sends an electric signal to the power source winding wire holder 9, so that the power source rotor 11 rotates by a preset angle.
S4, when the power source rotor 11 rotates, the sensor sensing circuit board detects the rotation angle of the power source rotor 11.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A pressure control device comprising:
a power source outputting power;
a transmission connected with the power source;
the pressure source comprises a piston and a cylinder, and the piston is connected with the transmission device;
the device is characterized in that the power source is directly driven and connected with the transmission device, the transmission device is of a single-bearing supporting structure, and the transmission device converts the rotating force of the power source into linear motion force to enable the pressure source piston to do reciprocating linear motion along the axis direction of the transmission device.
2. The pressure control device of claim 1, wherein the transmission comprises:
a hollow shaft driven to rotate by the power source;
the bearing is supported at one end of the hollow shaft;
the screw rod is connected with the hollow shaft and extends along the motion direction of the pressure source piston;
the screw is in threaded fit with the screw rod, the screw is connected with the pressure source piston, and the screw reciprocates along the axis direction of the screw rod.
3. The pressure control device as claimed in claim 2, further comprising an anti-rotation member fixedly connected to the pressure source cylinder and in sleeve engagement with the lead screw;
prevent changeing and to have seted up the slip chamber in the piece, prevent changeing the slip intracavity of piece and be provided with spacing portion, screw and spacing portion sliding fit, spacing portion is used for carrying out the circumference spacing to the screw.
4. The pressure control device of claim 1, wherein the pressure source further comprises:
and the sealing piece is fixedly arranged at one end, close to the transmission device, in the pressure source cylinder body, and the pressure source piston is in sealing fit with the sealing piece.
5. The pressure control device as claimed in claim 3, wherein the stopper is at least one projection extending from an end of the rotation preventing member adjacent to the nut toward the piston of the pressure source along a central axis of the rotation preventing member;
the outer wall of the nut is provided with a sliding groove in sliding fit with the limiting part.
6. The pressure control device as claimed in claim 3, wherein the limiting portion is at least one groove extending from an end of the rotation-preventing member near the nut toward the piston of the pressure source along a central axis of the rotation-preventing member;
the outer wall of the screw is provided with a sliding block, and the sliding block is in sliding fit with the limiting part.
7. The pressure control device of claim 1, further comprising an electromagnetic induction type angle sensor, the electromagnetic induction type angle sensor comprising a sensor rotor for fixed connection with the power source rotor for rotation therewith;
the sensor induction circuit board is used for being fixedly connected with the power source winding wire holder, and is in sleeve fit with the sensor rotor and used for detecting the rotation angle of the sensor rotor;
and the signal processing circuit board is electrically connected with the sensor sensing circuit board and the power source winding wire holder and is used for outputting the rotation angle of the sensor rotor, sending an electric signal to the power source winding wire holder and controlling the rotation angle of the power source rotor.
8. A pressure control device based brake system, comprising: pressure control means for providing braking force to the wheel brakes;
the controller is electrically connected with the pressure control device and is used for controlling the pressure output quantity of the pressure control device;
and one end of the hydraulic loop is communicated with a pressure source of the pressure control device, and the other end of the hydraulic loop is communicated with the wheel brake and used for transmitting brake oil and braking force.
9. A pressure control method based on a pressure control device is characterized by comprising the following steps: s1, when the brake system needs to be pressurized, the power source drives the screw rod to rotate in the positive direction, so that the screw nut and the pressure source piston move along the central axis of the screw rod in the direction away from the power source, and oil in the pressure source cylinder is sent into the brake system to pressurize the brake system;
and S2, when the brake system needs to be decompressed, the power source drives the screw rod to rotate reversely, so that the screw nut and the pressure source piston move along the central axis of the screw rod in the direction close to the power source, and oil in the brake system is sucked into the pressure source cylinder body to reduce the pressure of the brake system.
10. The pressure control method based on the pressure control apparatus according to claim 9, characterized by further comprising: s3, when the brake system needs to be pressurized or depressurized, the signal processing circuit board sends an electric signal to the power source winding wiring base, so that the power source rotor rotates by a preset angle;
and S4, when the power source rotor rotates, the sensor sensing circuit board detects the rotation angle of the power source rotor.
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| CN202110158260.1A CN112947612A (en) | 2021-02-04 | 2021-02-04 | Pressure control device, brake system, and pressure control method |
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| CN110388347A (en) * | 2018-04-17 | 2019-10-29 | 费斯托（中国）自动化制造有限公司 | Rotary actuator |
| CN111322217A (en) * | 2020-04-26 | 2020-06-23 | 山东理工大学 | Double-acting electromagnetic direct-drive linear servo pump |
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