CN114922920A - High-pressure cycloid rotor type magnetorheological fluid retarder electric control system and control method - Google Patents
High-pressure cycloid rotor type magnetorheological fluid retarder electric control system and control method Download PDFInfo
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- CN114922920A CN114922920A CN202210122832.5A CN202210122832A CN114922920A CN 114922920 A CN114922920 A CN 114922920A CN 202210122832 A CN202210122832 A CN 202210122832A CN 114922920 A CN114922920 A CN 114922920A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
- F16D57/002—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders comprising a medium with electrically or magnetically controlled internal friction, e.g. electrorheological fluid, magnetic powder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The invention discloses an electric control system and a control method of a high-pressure cycloid rotor type magnetorheological fluid retarder, which comprises an electric pump, a pressure sensor, a temperature sensor, a perforated plate electromagnetic coil, an unloading valve and three electromagnetic valves, wherein the electric pump is connected with the pressure sensor through a pipeline; the input end of the electric pump is connected with the first electromagnetic valve, the first electromagnetic valve is connected with the oil storage cavity when the power is off, and the first electromagnetic valve is connected with the working cavity when the power is on; the output end of the electric pump is connected with a second electromagnetic valve, the second electromagnetic valve is connected with the oil storage cavity when the second electromagnetic valve is powered off, and the second electromagnetic valve is connected with a third electromagnetic valve when the second electromagnetic valve is powered on; when the third electromagnetic valve is powered off, the third electromagnetic valve is connected with the working cavity of the retarder, and when the third electromagnetic valve is powered on, the main loop of the retarder is opened; the working cavity of the retarder is connected with a perforated plate electromagnetic coil; the unloading valve is connected with the retarder working cavity, and when the unloading valve is closed, the retarder working cavity is closed; the first pressure sensor is used for measuring the pressure of the unloading loop, and the second pressure sensor is used for measuring the pressure of the working cavity; the temperature sensor is used for measuring the temperature of the magnetorheological fluid in the working cavity.
Description
Technical Field
The invention relates to the technical field of hydraulic retarders, in particular to an electric control system and a control method of a high-pressure cycloid rotor type magnetorheological fluid retarder.
Background
The retarder is used as an auxiliary braking component of the vehicle, reduces the load of the braking system of the original vehicle by acting on the transmission system of the original vehicle, enables the vehicle to decelerate uniformly, improves the reliability of the braking system of the vehicle, prolongs the service life of the braking system, and can greatly reduce the use cost of the vehicle.
At present, there are eddy current retarders and hydrodynamic retarders. The eddy current retarder is large in size, heavy in machine body, large in power consumption and greatly influenced by ambient temperature. The hydraulic retarder has the advantages of large volume, relatively low reaction speed, insufficient low-speed braking power and large no-load loss.
The cycloid rotor type magnetorheological fluid retarder is applied to a commercial vehicle braking auxiliary system, is arranged on the outer side of a vehicle gearbox or a vehicle frame, and is connected with a transmission shaft through a gear. When the magnetorheological fluid works, the magnetorheological fluid is controlled to fill the working cavity between the rotor and the stator to form pressure. When the rotor rotates, the rotor and the stator generate certain torque, the rotor generates certain braking force on the transmission shaft, kinetic energy of the automobile is converted into heat energy of the working liquid of the retarder, and the heat energy is dissipated into the cooling system through the plate.
The existing research on the magnetorheological fluid retarder mainly focuses on the structural design of the retarder, and the research on the control of the retarder through an electric control device is omitted.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an electric control system and a control method of a high-pressure cycloid rotor type magnetorheological fluid retarder, wherein the electric control system is designed, magnetic fluxes of three electromagnetic valves and a porous plate electromagnetic coil are controlled in order, magnetorheological fluid is filled in a working cavity of the retarder to form pressure, and the adjustment and control of the pressure of the oil fluid are realized by controlling the viscosity of magnetic fluid through the change of a magnetic field; in addition, the opening degree of the high-low pressure cavity channel is controlled by the electric pump, so that closed-loop control can be formed by an algorithm and pressure detection when emergency braking is not performed, and the brake is ensured to be smooth and controllable.
The purpose of the invention is realized by the following technical scheme:
a high-pressure cycloid rotor type magnetorheological fluid retarder electric control system comprises an electric pump 17, a first pressure sensor 21, a second pressure sensor 11, a temperature sensor 12, a porous plate electromagnetic coil 13, an unloading valve, a first electromagnetic valve 18, a second electromagnetic valve 22, a third electromagnetic valve 23 and an oil storage cavity 19; the input end of the electric pump 17 is connected with a first electromagnetic valve 18, the first electromagnetic valve 18 is connected with the oil storage cavity 19 when the power is off, and the first electromagnetic valve 18 is connected with the retarder working cavity when the power is on; the output end of the electric pump 17 is connected with a second electromagnetic valve 22, the second electromagnetic valve 22 is connected with the oil storage cavity 19 when the power is off, and the second electromagnetic valve 22 is connected with a third electromagnetic valve 23 when the power is on; the third electromagnetic valve 23 is connected with the working cavity of the retarder when the power is off, and the main loop of the retarder is opened when the third electromagnetic valve 23 is powered on; the retarder working cavity is connected with a perforated plate electromagnetic coil 13, and when the perforated plate electromagnetic coil 13 is electrified, the output port of the retarder working cavity is closed; the perforated plate electromagnetic coil 13 is connected with the plate heat exchanger 6; the unloading valve is connected with the working cavity of the retarder and is controlled to be opened and closed by the electric pump 17, and when the unloading valve is closed, the working cavity of the retarder is closed; the first pressure sensor 21 is used for measuring the pressure of the unloading loop, and the second pressure sensor 11 is used for measuring the pressure of a working cavity of the retarder; the temperature sensor 12 is used for measuring the temperature of the magnetorheological fluid in the working cavity of the retarder.
Further, an input port of the unloading valve 9 is connected with a high-pressure cavity of the retarder working cavity, and an output port of the first unloading valve 9 is connected with a low-pressure cavity of the retarder working cavity.
Furthermore, a return spring is arranged on the right side of the piston in the unloading valve body, when no pressure exists on the left side of the piston, the piston is in an open state under the action of the spring, and the pressure cannot be built in the working cavity of the retarder; when the retarder needs to be loaded to generate braking force, the electric pump 17 supplies oil to the left end of the unloading valve, so that the pressure at the left end of the unloading valve is greater than the right spring force, the piston of the unloading valve is in a closed state, the working cavity of the retarder is sealed, pressure is generated, system loading action is realized, and braking force is generated. In addition, according to the left pressure, the valve core of the unloading valve can work at different positions, namely the opening of the valve port of the unloading valve can be controlled by the left pressure, and the size of the communication channel of the high-low pressure cavity is further controlled.
Further, when the perforated plate electromagnetic coil 13 is electrified, the output port of the working cavity of the retarder is closed, and the pressure in the working cavity rises.
Further, the electric pump 17 is provided with an electric pump relief valve 20.
Further, the third electromagnetic valve 23 is connected with the oil inlet one-way valve 24 when being electrified; when the oil inlet one-way valve 24 is opened, the retarder main loop is opened.
The invention also provides a control method of the high-pressure cycloid rotor type magnetorheological fluid retarder electric control system, which comprises the following steps:
s1, a preparation stage:
s11, powering off all the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, working the electric pump for 0.5s, and performing self-lubrication at 500-1000 revolutions;
s12, oil injection of the working cavity: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered off, the electric pump works for 0.5s and 1000 revolutions, and oil is filled into the working cavity of the retarder; then the second electromagnetic valve is powered off, and oil injection is stopped;
s2, the vehicle enters an idle-load stage:
s21, when the vehicle runs forwards, the retarder is in an oil pumping state: at the moment, the first electromagnetic valve is electrified, the second electromagnetic valve is powered off, the third electromagnetic valve is powered off, the electric pump works, and oil is pumped from a working cavity of the buffer; then proceed to S22;
s22, oil supplement state: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered off, the electric pump works, and oil is filled into the working cavity of the retarder; then proceeds to step S3;
s23, when the vehicle runs in a reverse mode, the retarder is in a reverse state: the first electromagnetic valve is powered off, the second electromagnetic valve is powered off, the third electromagnetic valve is powered off, the electric pump does not work, and then the step S3 is executed;
s3, retarder braking:
s31, when the vehicle is shifted up: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered on, and the retarder main loop is opened; the electric pump works in an accelerated way, the unloading valve is closed, and the working cavity of the retarder is closed; the electromagnetic coil of the perforated plate is electrified and magnetized, and the pressure in the working cavity of the retarder is increased;
s32, when the vehicle is shifted down: the first electromagnetic valve is powered off, the second electromagnetic valve is controlled, the third electromagnetic valve is powered on, the electric pump works at a reduced speed, and the electromagnetic coil of the porous plate is powered on and magnetized;
s33, when the vehicle is in a constant-speed gear shift state: and (4) dynamically controlling the gear increasing and decreasing according to the initial speed of braking, and keeping the vehicle speed.
S4: control process of perforated plate electromagnetic coil
A driver inputs a gear signal, a controller inputs a target current value, a PWM control signal is output through a fuzzy PID controller, a perforated plate electromagnetic coil is controlled, the average current output by the electromagnetic coil is detected through a current measuring resistor, the average amplitude value is calculated, the average value of a current signal is calculated through AD conversion, and the average value of the current signal is compared with the target current value to form a feedback signal.
The invention has the following beneficial effects:
the invention provides an electric control system of a high-pressure cycloid rotor type magnetorheological fluid retarder, which realizes the adjustment and control of the pressure of oil fluid by controlling the viscosity of magnetic fluid through the change of a magnetic field by the matching control of an electric pump, an electromagnetic valve, an unloading valve, a porous plate electromagnetic coil and a sensor.
The invention provides a control method of an electric control system of a high-pressure cycloid rotor type magnetorheological fluid retarder, completely provides control processes corresponding to working conditions in a preparation stage, a no-load stage and a braking stage, and fills up the blank of electric control research of the magnetorheological fluid retarder.
Drawings
Fig. 1 is a schematic diagram of an electric control system of a high-pressure cycloidal rotor type magnetorheological fluid retarder according to an embodiment of the invention;
fig. 2 is a flowchart of a control method of the electric control system of the high-pressure cycloid rotor magnetorheological fluid retarder according to the embodiment of the invention;
in the figure:
6-plate heat exchanger; 7-an oil inlet; 8-oil outlet; 9-unloading valve number one; a No. 10-II unloading valve; 11-pressure sensor number two; 12-a temperature sensor; 13-a perforated plate solenoid valve; 14-outlet check valve; 15-a pilot overflow valve; 16-a filter; 17-an electric pump; 18-a solenoid valve; 19-an oil storage chamber; 20-electric pump safety valve; 21-pressure sensor number one; 22-second solenoid valve; no. 23-three electromagnetic valve; 24-oil inlet check valve.
Fig. 3 is a control flow chart of the porous plate electromagnetic coil of the high-pressure cycloid rotor magnetorheological fluid retarder according to the embodiment of the invention.
In the figure:
25-driver input gear signal; 26-target current value; 27-fuzzy PID controller; 28-PWM control signal; 29-an electromagnetic coil; 30-average current; 31-current measuring resistance; 32-calculating the average amplitude; 33-AD conversion; 34-calculate the average current signal.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
A high-pressure cycloid rotor type magnetorheological fluid retarder electric control system comprises an electric pump 17, a first pressure sensor 21, a second pressure sensor 11, a temperature sensor 12, a porous plate electromagnetic coil 13, an unloading valve, a first electromagnetic valve 18, a second electromagnetic valve 22, a third electromagnetic valve 23 and an oil storage cavity 19; the input end of the electric pump 17 is connected with a first electromagnetic valve 18, the first electromagnetic valve 18 is connected with the oil storage cavity 19 when the power is off, and the first electromagnetic valve 18 is connected with the retarder working cavity when the power is on; the output end of the electric pump 17 is connected with a second electromagnetic valve 22, the second electromagnetic valve 22 is connected with the oil storage cavity 19 when the power is off, and the second electromagnetic valve 22 is connected with a third electromagnetic valve 23 when the power is on; the third electromagnetic valve 23 is connected with the working cavity of the retarder when the power is off, and the main loop of the retarder is opened when the third electromagnetic valve 23 is powered on; the retarder working cavity is connected with a perforated plate electromagnetic coil 13, and when the perforated plate electromagnetic coil 13 is electrified, the output port of the retarder working cavity is closed; the perforated plate electromagnetic coil 13 is connected with the plate heat exchanger 6; the unloading valve is connected with the working cavity of the retarder and is controlled to be opened and closed by the electric pump 17, and when the unloading valve is closed, the working cavity of the retarder is closed; the first pressure sensor 21 is used for measuring the pressure of the unloading loop, and the second pressure sensor 11 is used for measuring the pressure of a working cavity of the retarder; the temperature sensor 12 is used for measuring the temperature of the magnetorheological fluid in the working cavity of the retarder.
Further, an input port of the unloading valve 9 is connected with a high-pressure cavity of the retarder working cavity, and an output port of the first unloading valve 9 is connected with a low-pressure cavity of the retarder working cavity. An input port of the unloading valve 10 is connected with a high-pressure cavity of the retarder working cavity, and an output port of the second unloading valve 10 is connected with a low-pressure cavity of the retarder working cavity.
Furthermore, a return spring is arranged on the right side of the piston in the unloading valve body, when no pressure exists on the left side of the piston, the piston is in an open state under the action of the spring, and the pressure cannot be built in the working cavity of the retarder; when the retarder needs to be loaded to generate braking force, the electric pump 17 supplies oil to the left end of the unloading valve, so that the pressure at the left end of the unloading valve is larger than the force of the right spring, the piston of the unloading valve is in a closed state, the working cavity of the retarder is sealed, pressure is generated, system loading action is realized, and the braking force is generated. In addition, according to the pressure of the left side, the valve core of the unloading valve can work at different positions, namely, the opening degree of the valve port of the unloading valve can be controlled through the pressure of the left side, and the size of the communication channel of the high-low pressure cavity is further controlled.
Further, when the perforated plate electromagnetic coil 13 is electrified, the output port of the working cavity of the retarder is closed, and the pressure in the working cavity rises.
Further, the electric pump 17 is provided with an electric pump relief valve 20.
Further, the third electromagnetic valve 23 is connected with the oil inlet one-way valve 24 when being electrified; when the oil inlet one-way valve 24 is opened, the retarder main loop is opened.
A high-pressure cycloid rotor type magnetorheological fluid retarder electric control system comprises a control method and a control system, wherein the control method comprises the following steps:
s1, a preparation stage:
s11, powering off all the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, working the electric pump for 0.5s, and performing self-lubrication after 500-1000 revolutions;
s12, oil injection of the working cavity: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered off, the electric pump works for 0.5s and 1000 revolutions, and oil is filled into the working cavity of the retarder; then the second electromagnetic valve is powered off, and oil injection is stopped;
s2, the vehicle enters an idle load stage:
s21, when the vehicle runs forwards, the retarder is in an oil pumping state: at the moment, the first electromagnetic valve is electrified, the second electromagnetic valve is powered off, the third electromagnetic valve is powered off, the electric pump works, and oil is pumped from a working cavity of the buffer; then proceed to S22;
s22, oil supplement state: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered off, the electric pump works, and oil is filled into the working cavity of the retarder; then, the flow proceeds to step S3;
s23, when the vehicle runs in a reverse mode, the retarder is in a reverse state: the first electromagnetic valve is powered off, the second electromagnetic valve is powered off, the third electromagnetic valve is powered off, the electric pump does not work, and then the step S3 is executed;
s3, retarder braking:
s31, when the vehicle is shifted up: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered on, and the retarder main loop is opened; the electric pump works in an accelerated way, the unloading valve is closed, and the working cavity of the retarder is closed; the electromagnetic coil of the perforated plate is electrified and magnetized, and the pressure in the working cavity of the retarder is increased;
s32, during gear reduction of the vehicle: the first electromagnetic valve is powered off, the second electromagnetic valve is controlled, the third electromagnetic valve is powered on, the electric pump works at a reduced speed, and the electromagnetic coil of the porous plate is powered on and magnetized;
s33, when the vehicle is in a constant-speed gear shift state: and (4) dynamically controlling the gear increasing and decreasing according to the initial speed of braking, and keeping the vehicle speed.
S4: control process of perforated plate electromagnetic coil
A driver inputs a gear signal, a controller inputs a target current value, a PWM control signal is output through a fuzzy PID controller, a perforated plate electromagnetic coil is controlled, the average current output by the electromagnetic coil is detected through a current measuring resistor, the average amplitude value is calculated, the average value of a current signal is calculated through AD conversion, and the average value of the current signal is compared with the target current value to form a feedback signal.
Examples
The embodiment is an electric control system of a high-pressure cycloid rotor type magnetorheological fluid retarder, which is applied to the electric control of the high-pressure cycloid rotor type magnetorheological fluid retarder.
The viscosity of the magnetorheological fluid is controlled by controlling the change of the magnetic field in the working cavity of the retarder, and the adjustment control of the oil pressure in the retarder can be realized, so that the embodiment provides the high-pressure cycloid rotor type magnetorheological fluid retarder electric control system, as shown in fig. 1, the high-pressure cycloid rotor type magnetorheological fluid retarder electric control system comprises an electric pump 17, a first pressure sensor 21, a second pressure sensor 11, a temperature sensor 12, a porous plate electromagnetic coil 13, a first unloading valve 9, a second unloading valve 10, a first electromagnetic valve 18, a second electromagnetic valve 22, a third electromagnetic valve 23, an oil storage cavity 19 and an oil inlet switch valve 24.
The input end of the electric pump 17 is connected with the first electromagnetic valve 18, the first electromagnetic valve 18 is connected with the oil storage cavity 19 when the power is off, and the first electromagnetic valve 18 is connected with the retarder working cavity when the power is on; the output end of the electric pump 17 is connected with a second electromagnetic valve 22, the second electromagnetic valve 22 is connected with the oil storage cavity 19 when the power is off, and the second electromagnetic valve 22 is connected with a third electromagnetic valve 23 when the power is on; the third electromagnetic valve 23 is connected with the working cavity of the retarder when the power is off, and the third electromagnetic valve 23 is connected with the oil inlet switch valve 24 when the power is on; when the oil inlet switch valve 24 is opened, an oil inlet oil path of the working cavity of the retarder is opened; the outlet of the retarder is connected with a perforated plate electromagnetic coil 13, and when the perforated plate electromagnetic coil 13 is electrified, the damping of the outlet of the working cavity of the retarder is increased; the output buckle damping characteristic of the working cavity can be controlled by controlling the size and the characteristic of the current of the perforated plate electromagnetic coil 13, so that the output torque characteristic is controlled. The perforated plate electromagnetic coil 13 is connected with the plate heat exchanger 6 through the one-way valve 14, the plate heat exchanger 6 is connected with the oil storage chamber 19, and the oil circuit of the plate heat exchanger is provided with the filter 16; the input port of the first unloading valve 9 is connected with the high-pressure cavity of the working cavity of the retarder, and the output port of the first unloading valve 9 is connected with the low-pressure cavity of the working cavity of the retarder; an input port of the second unloading valve 10 is connected with a high-pressure cavity of the retarder working cavity, and an output port of the second unloading valve 10 is connected with a low-pressure cavity of the retarder working cavity; the unloading valve is controlled to be opened and closed through the electric pump 17, and when the unloading valve is closed, the working cavity of the retarder is closed.
A return spring is arranged on the right side of a piston in a valve body of the unloading valve, when pressure does not exist on the left side of the piston, the piston is in an opening state under the action of the spring, and a working cavity of the retarder cannot build pressure. When the retarder needs to be loaded to generate braking force, pressure is built on the unloading valve through the electric pump 17 and the electromagnetic valve, so that the piston of the unloading valve is in a closed state, a working cavity of the retarder is sealed, pressure is generated, system loading action is achieved, and the braking force is generated.
The temperature sensor and the pressure sensor are used as input signals of the retarder controller and used for monitoring the temperature of working liquid in a working cavity of the retarder, the temperature of the water in the plate heat exchanger and the pressure of the working cavity. The first pressure sensor 21 is used for measuring pressure of an unloading loop, and the second pressure sensor 11 is used for measuring pressure of a working cavity of the retarder; the two temperature sensors are respectively used for measuring the temperature of the working fluid (magnetorheological fluid) in the working cavity of the retarder and the temperature of the water in the plate heat exchanger 6, when the retarder works, the temperature of the working fluid (magnetorheological fluid) in the working cavity is gradually increased, and the temperature value is acquired by the temperature sensor 12.
The pressure value of the working cavity of the retarder is collected by the second pressure sensor 11, when the electromagnetic coil 13 of the porous plate is electrified, the output port of the working cavity is closed, the pressure in the working cavity rises, otherwise, the output port of the working cavity is opened, and the pressure is reduced.
The plate heat exchanger 6 is provided with a pilot overflow valve 15. The electric pump 17 is provided with an electric pump relief valve 20.
In addition, the opening degree of the high-low pressure cavity channel is controlled by the electric pump, so that closed-loop control can be formed by an algorithm and pressure detection when emergency braking is not performed, and the brake is not only ensured to be smooth but also controllable.
The control method of the electric control system for the high-pressure cycloid rotor type magnetorheological fluid retarder in the embodiment comprises the following steps:
s1, a preparation stage:
s11, powering off all the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, working the electric pump for 0.5s, and performing self-lubrication after 500-1000 revolutions;
s12, injecting oil into the working cavity: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered off, the electric pump works for 0.5s and 1000 revolutions, and oil is filled into the working cavity of the retarder; then the second electromagnetic valve is powered off, the oil injection is stopped, and the oil returns to the oil storage cavity directly;
s2, the vehicle enters an idle-load stage:
s21, when the vehicle runs forwards, the retarder is in an oil pumping state: at the moment, the first electromagnetic valve is electrified, the second electromagnetic valve is powered off, the third electromagnetic valve is powered off, the electric pump works, and oil is pumped from a working cavity of the buffer; then, the process proceeds to S22;
s22, oil supplementing state: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered off, the electric pump works, and oil is filled into the working cavity of the retarder; then proceeds to step S3;
s23, when the vehicle runs in a reverse mode, the retarder is in a reverse state: the first electromagnetic valve is powered off, the second electromagnetic valve is powered off, the third electromagnetic valve is powered off, the electric pump does not work, and then the step S3 is executed;
s3, retarder braking:
s31, when the vehicle is shifted up: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered on, and the retarder main loop is opened; the electric pump works in an accelerated way, the unloading valve is closed, and the working cavity of the retarder is closed; the electromagnetic coil of the perforated plate is electrified and magnetized, and the pressure in the working cavity of the retarder is increased;
s32, when the vehicle is shifted down: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered on, the electric pump works at a reduced speed, and the electromagnetic coil of the porous plate is powered on and magnetized;
s33, when the vehicle is in constant-speed gear shifting: and (4) dynamically controlling the gear increasing and decreasing according to the initial speed of braking, and keeping the vehicle speed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A high-pressure cycloid rotor type magnetorheological fluid retarder electric control system is characterized by comprising an electric pump (17), a first pressure sensor (21), a second pressure sensor (11), a temperature sensor (12), a porous plate electromagnetic coil (13), an unloading valve, a first electromagnetic valve (18), a second electromagnetic valve (22), a third electromagnetic valve (23) and an oil storage cavity (19); the input end of the electric pump (17) is connected with a first electromagnetic valve (18), the first electromagnetic valve (18) is connected with the oil storage cavity (19) when the power is off, and the first electromagnetic valve (18) is connected with the retarder working cavity when the power is on; the output end of the electric pump (17) is connected with a second electromagnetic valve (22), the second electromagnetic valve (22) is connected with the oil storage cavity (19) when the power is off, and the second electromagnetic valve (22) is connected with a third electromagnetic valve (23) when the power is on; the third electromagnetic valve (23) is connected with the working cavity of the retarder when the power is off, and the main loop of the retarder is opened when the third electromagnetic valve (23) is powered on; the retarder working cavity is connected with a perforated plate electromagnetic coil (13), and when the perforated plate electromagnetic coil (13) is electrified, the output port of the retarder working cavity is closed; the perforated plate electromagnetic coil (13) is connected with the plate heat exchanger (6); the unloading valve is connected with the working cavity of the retarder, the opening and the closing of the unloading valve are controlled by an electric pump (17), and when the unloading valve is closed, the working cavity of the retarder is closed; the first pressure sensor (21) is used for measuring the pressure of the unloading loop, and the second pressure sensor (11) is used for measuring the pressure of a working cavity of the retarder; the temperature sensor (12) is used for measuring the temperature of magnetorheological fluid in the working cavity of the retarder.
2. The electric control system for the high-pressure cycloid rotor-type magnetorheological fluid retarder of claim 1, wherein an input port of the unloading valve is connected with a high-pressure cavity of a working cavity of the retarder, and an output port of the unloading valve is connected with a low-pressure cavity of the working cavity of the retarder.
3. The electric control system of the high-pressure cycloid rotor type magnetorheological fluid retarder as claimed in claim 2, wherein the right side of the piston in the unloading valve body is provided with a return spring, when no pressure exists on the left side of the piston, the piston is in an open state under the action of the spring, and a working cavity of the retarder cannot build pressure; when the retarder needs to be loaded to generate braking force, pressure is built on the unloading valve through the electric pump (17), so that the piston of the unloading valve is in a closed state, a working cavity of the retarder is sealed, pressure is generated, system loading action is achieved, and the braking force is generated.
4. The electric control system of the high-pressure cycloid rotor type magnetorheological fluid retarder according to claim 1, wherein when the porous plate electromagnetic coil (13) is electrified, an output port of a working cavity of the retarder is closed, and the pressure in the working cavity rises.
5. The electric control system for the high-pressure cycloid rotor magnetorheological fluid retarder of claim 1, wherein the electric pump (17) is provided with an electric pump safety valve (20).
6. The electric control system of the high-pressure cycloid rotor type magnetorheological fluid retarder according to claim 1, wherein the third electromagnetic valve (23) is connected with the oil inlet check valve (24) when being electrified; when the oil inlet check valve (24) is opened, the retarder main loop is opened.
7. The control method of the electric control system of the high-pressure cycloid rotor type magnetorheological fluid retarder according to claim 1, characterized by comprising the following steps:
s1, a preparation stage:
s11, powering off all the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, working the electric pump for 0.5s, and performing self-lubrication after 500-1000 revolutions;
s12, oil injection of the working cavity: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered off, the electric pump works for 0.5s and 1000 revolutions, and oil is filled into the working cavity of the retarder; then the second electromagnetic valve is powered off, and oil injection is stopped;
s2, the vehicle enters an idle load stage:
s21, when the vehicle runs forwards, the retarder is in an oil pumping state: at the moment, the first electromagnetic valve is electrified, the second electromagnetic valve is powered off, the third electromagnetic valve is powered off, and the electric pump works to pump oil from the working cavity of the retarder; then proceed to S22;
s22, oil supplement state: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered off, the electric pump works, and oil is filled into the working cavity of the retarder; then proceeds to step S3;
s23, when the vehicle runs in a reverse mode, the retarder is in a reverse state: the first electromagnetic valve is powered off, the second electromagnetic valve is powered off, the third electromagnetic valve is powered off, the electric pump does not work, and then the step S3 is executed;
s3, retarder braking:
s31, during gear increasing of the vehicle: the first electromagnetic valve is powered off, the second electromagnetic valve is powered on, the third electromagnetic valve is powered on, and the retarder main loop is opened; the electric pump works in an accelerated way, the unloading valve is closed, and the working cavity of the retarder is closed; the electromagnetic coil of the perforated plate is electrified and magnetized, and the pressure in the working cavity of the retarder is increased;
s32, when the vehicle is shifted down: the first electromagnetic valve is powered off, the second electromagnetic valve is controlled, the third electromagnetic valve is powered on, the electric pump works at a reduced speed, and the electromagnetic coil of the porous plate is powered on and magnetized;
s33, when the vehicle is in constant-speed gear shifting: and (4) dynamically controlling the gear increasing and decreasing according to the initial speed of braking, and keeping the vehicle speed.
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| CN114922920B (en) | 2023-06-30 |
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