CN114922920B - 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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- CN114922920B CN114922920B CN202210122832.5A CN202210122832A CN114922920B CN 114922920 B CN114922920 B CN 114922920B CN 202210122832 A CN202210122832 A CN 202210122832A CN 114922920 B CN114922920 B CN 114922920B
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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, wherein the electric control system comprises an electric pump, a pressure sensor, a temperature sensor, a perforated plate electromagnetic coil, an unloading valve and three electromagnetic valves; the input end of the electric pump is connected with a first electromagnetic valve, the first electromagnetic valve is connected with the oil storage cavity when the first electromagnetic valve is powered off, and the first electromagnetic valve is connected with the working cavity when the first electromagnetic valve is powered 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; the third electromagnetic valve is connected with the retarder working cavity when the third electromagnetic valve is powered off, and the retarder main loop is opened when the third electromagnetic valve is powered on; the retarder working cavity 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, and acts on the transmission system of the original vehicle to lighten the load of the braking system of the original vehicle, so that the vehicle is uniformly decelerated, the reliability of the braking system of the vehicle is improved, the service life of the braking system is prolonged, and the use cost of the vehicle can be greatly reduced.
Currently, there are electric eddy current retarders and hydraulic retarders. The electric vortex retarder has large size, heavy body, large electric energy consumption and larger influence by the surrounding environment temperature. The hydrodynamic retarder has the advantages of large volume, relatively slow reaction speed, insufficient low-speed braking force 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 magnetic rheological fluid pump works, the magnetorheological fluid is controlled to fill a working cavity between the rotor and the stator to form pressure. When the rotor rotates, a certain torque is generated with the stator, a certain braking force is generated on the transmission shaft through the rotor, the kinetic energy of the automobile is converted into the heat energy of working fluid of the retarder, and the energy is emitted into the cooling system through plate replacement.
The research of the existing magnetorheological fluid retarder is mainly focused on the structural design of the retarder, and the research of controlling the retarder through an electric control device is omitted.
Disclosure of Invention
In order to solve the problems in the prior art, the high-pressure cycloid rotor type magnetorheological fluid retarder electric control system and the control method are designed, and the magnetorheological fluid is filled in a retarder working cavity to form pressure by orderly controlling magnetic fluxes of three electromagnetic valves and electromagnetic coils of a porous plate, so that the adjustment and control of the oil pressure are realized in a mode of controlling the viscosity of magnetic fluid through magnetic field change; in addition, the opening of the high-low pressure cavity channel is controlled by the electric pump, so that the brake can be controlled in a closed loop mode through an algorithm and pressure detection when the brake is not in emergency braking, and the brake is smooth and controllable.
The invention aims at realizing the following technical scheme:
an electric control system of a high-pressure cycloid rotor type magnetorheological fluid retarder comprises an electric pump 17, a first pressure sensor 21, a second pressure sensor 11, a temperature sensor 12, a perforated 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 an oil storage cavity 19 when the power is off, and the first electromagnetic valve 18 is connected with a 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 retarder working chamber when the power is off, and the retarder main loop is opened when the third electromagnetic valve 23 is on; the retarder working cavity is connected with the 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 retarder working chamber, the unloading valve is controlled to be opened and closed by the electric pump 17, and when the unloading valve is closed, the retarder working chamber is closed; the first pressure sensor 21 is used for measuring the pressure of an 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 chamber 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, the right side of the piston in the unloading valve body is provided with a return spring, when the left side of the piston is not pressurized, the piston is in an open state under the action of the spring, and the retarder working cavity cannot build pressure; 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 of the left end of the unloading valve is larger than the spring force on the right side, the piston of the unloading valve is in a closed state, the working cavity of the retarder is closed, pressure is generated, loading action of the system is realized, and braking force is generated. In addition, the valve core of the unloading valve can work at different positions according to the left side pressure, namely the opening of the valve port of the unloading valve can be controlled through the left side pressure, and the size of the communication channel of the high-pressure cavity and the low-pressure cavity can be 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 is increased.
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 check valve 24 when being electrified; when the oil inlet check valve 24 is opened, the retarder main circuit is opened.
The invention also provides a control method of the electric control system of the high-pressure cycloid rotor type magnetorheological fluid retarder, which comprises the following steps:
s1, preparation:
s11, all the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are powered off, and the electric pump works for 0.5s,500-1000 turns and is self-lubricating;
s12, oiling 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 turns, and oil is injected 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 stage:
s21, when the vehicle is in forward running, the retarder is in an oil pumping state: at the moment, the first electromagnetic valve is electrified, the second electromagnetic valve is deenergized, the third electromagnetic valve is deenergized, the electric pump works, and oil is pumped from the working cavity of the retarder; 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 injected into the working cavity of the retarder; then enter step S3;
s23, when the vehicle runs in reverse, 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 carried out;
s3, braking by a retarder:
s31, when the vehicle is in gear increasing: 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 acceleration way, the unloading valve is closed, and the working cavity of the retarder is closed; energizing and magnetizing the electromagnetic coil of the porous plate, and increasing the pressure in the working cavity of the retarder;
s32, when the vehicle is in gear shifting 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 perforated plate is powered on and magnetized;
s33, when the vehicle is at constant speed: and dynamically controlling the gear increase and decrease according to the initial speed of braking, and keeping the vehicle speed.
S4.: control flow of electromagnetic coil of perforated plate
The driver inputs a gear signal, the controller inputs a target current value, a PWM control signal is output through a fuzzy PID controller, the perforated plate electromagnetic coil is controlled, the average current output by the electromagnetic coil is detected through a current measuring resistor, the average amplitude is calculated, the average value of the current signal is calculated through AD conversion, and 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 oil pressure in a mode of controlling the viscosity of magnetic fluid by using magnetic field change through the cooperative control of an electric pump, an electromagnetic valve, an unloading valve, a perforated 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, which completely provides corresponding control processes of working conditions of a preparation stage, an idle stage and a braking stage, and fills 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 cycloid rotor type magnetorheological fluid retarder according to an embodiment of the invention;
fig. 2 is a flowchart of a control method of the high-pressure cycloid rotor type magnetorheological fluid retarder electric control system according to the embodiment of the invention;
in the figure:
6-plate heat exchanger; 7-oil inlet; 8-an oil outlet; 9-a first unloading valve; 10-No. two unloading valves; 11-No. two pressure sensors; 12-a temperature sensor; 13-a multi-plate solenoid valve; 14-outlet check valve; 15-a pilot relief valve; 16-a filter; 17-an electric pump; 18-solenoid valve number one; 19-an oil storage cavity; 20-an electric pump safety valve; 21-pressure sensor number one; 22-a second electromagnetic valve; 23-a third electromagnetic valve; 24-oil inlet check valve.
Fig. 3 is a control flow chart of a perforated plate electromagnetic coil of the high-pressure cycloid rotor type magnetorheological fluid retarder according to the embodiment of the invention.
In the figure:
25-driver input gear signal; 26-target current value; 27-a fuzzy PID controller; 28-PWM control signal; 29-electromagnetic coils; 30-average current; 31-current measuring resistor; 32-calculating an average amplitude; 33-AD conversion; 34-calculate the average current signal.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof.
An electric control system of a high-pressure cycloid rotor type magnetorheological fluid retarder comprises an electric pump 17, a first pressure sensor 21, a second pressure sensor 11, a temperature sensor 12, a perforated 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 an oil storage cavity 19 when the power is off, and the first electromagnetic valve 18 is connected with a 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 retarder working chamber when the power is off, and the retarder main loop is opened when the third electromagnetic valve 23 is on; the retarder working cavity is connected with the 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 retarder working chamber, the unloading valve is controlled to be opened and closed by the electric pump 17, and when the unloading valve is closed, the retarder working chamber is closed; the first pressure sensor 21 is used for measuring the pressure of an 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 chamber 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, the right side of the piston in the unloading valve body is provided with a return spring, when the left side of the piston is not pressurized, the piston is in an open state under the action of the spring, and the retarder working cavity cannot build pressure; 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 of the left end of the unloading valve is larger than the spring force on the right side, the piston of the unloading valve is in a closed state, the working cavity of the retarder is closed, pressure is generated, loading action of the system is realized, and braking force is generated. In addition, the valve core of the unloading valve can work at different positions according to the left side pressure, namely the opening of the valve port of the unloading valve can be controlled through the left side pressure, and the size of the communication channel of the high-pressure cavity and the low-pressure cavity can be 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 is increased.
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 check valve 24 when being electrified; when the oil inlet check valve 24 is opened, the retarder main circuit is opened.
An electric control system of a high-pressure cycloid rotor type magnetorheological fluid retarder, the control method comprises the following steps:
s1, preparation:
s11, all the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are powered off, and the electric pump works for 0.5s,500-1000 turns and is self-lubricating;
s12, oiling 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 turns, and oil is injected 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 stage:
s21, when the vehicle is in forward running, the retarder is in an oil pumping state: at the moment, the first electromagnetic valve is electrified, the second electromagnetic valve is deenergized, the third electromagnetic valve is deenergized, the electric pump works, and oil is pumped from the working cavity of the retarder; 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 injected into the working cavity of the retarder; then enter step S3;
s23, when the vehicle runs in reverse, 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 carried out;
s3, braking by a retarder:
s31, when the vehicle is in gear increasing: 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 acceleration way, the unloading valve is closed, and the working cavity of the retarder is closed; energizing and magnetizing the electromagnetic coil of the porous plate, and increasing the pressure in the working cavity of the retarder;
s32, when the vehicle is in gear shifting 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 perforated plate is powered on and magnetized;
s33, when the vehicle is at constant speed: and dynamically controlling the gear increase and decrease according to the initial speed of braking, and keeping the vehicle speed.
S4.: control flow of electromagnetic coil of perforated plate
The driver inputs a gear signal, the controller inputs a target current value, a PWM control signal is output through a fuzzy PID controller, the perforated plate electromagnetic coil is controlled, the average current output by the electromagnetic coil is detected through a current measuring resistor, the average amplitude is calculated, the average value of the current signal is calculated through AD conversion, and 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 electric control of the high-pressure cycloid rotor type magnetorheological fluid retarder.
The viscosity of the magnetorheological fluid is controlled by controlling the magnetic field change in the working cavity of the retarder, and the adjustment and control of the oil pressure in the retarder can be realized, so the embodiment provides an electric control system of the high-pressure cycloid rotor type magnetorheological fluid retarder, which 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 as shown in figure 1.
The input end of the electric pump 17 is connected with a first electromagnetic valve 18, the first electromagnetic valve 18 is connected with an oil storage cavity 19 when the power is off, and the first electromagnetic valve 18 is connected with a 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 retarder working chamber 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 circuit 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 damping characteristic of the output buckle of the working cavity can be controlled by controlling the size and the characteristic of the energizing current of the electromagnetic coil 13 of the perforated plate, so that the characteristic of the output torque 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 cavity 19, and a filter 16 is arranged on an oil path of the plate heat exchanger 6; the input port of the first unloading valve 9 is connected with the high-pressure cavity of the retarder working cavity, and the output port of the first unloading valve 9 is connected with the low-pressure cavity of the retarder working cavity; the input port of the second unloading valve 10 is connected with the high-pressure cavity of the retarder working cavity, and the output port of the second unloading valve 10 is connected with the low-pressure cavity of the retarder working cavity; the unloading valve 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.
When the left side of the piston is not pressurized, the piston is in an open state under the action of the spring, and the retarder working cavity cannot build pressure. When the retarder needs to be loaded to generate braking force, the electric pump 17 and the electromagnetic valve are used for establishing pressure on the unloading valve, so that the piston of the unloading valve is in a closed state, a working cavity of the retarder is closed to generate pressure, the loading action of the system is realized, and the braking force is generated.
The temperature sensor and the pressure sensor are used as input signals of the retarder controller and are used for monitoring the temperature of working fluid in a working cavity of the retarder, the water temperature of the plate heat exchanger and the pressure of the working cavity. 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 the working cavity of the retarder; the two temperature sensors are respectively used for measuring the temperature of working fluid (magnetorheological fluid) in the working cavity of the retarder and the water temperature of the plate heat exchanger 6, and when the retarder works, the temperature of the working fluid (magnetorheological fluid) in the working cavity gradually rises, and the temperature value of the working fluid (magnetorheological fluid) is collected 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 perforated plate electromagnetic coil 13 is electrified, the output port of the working cavity is closed, the pressure in the working cavity is increased, 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 of the high-low pressure cavity channel is controlled by the electric pump, so that the hydraulic control system can be used for non-emergency braking, and closed-loop control is formed by algorithm and pressure detection, so that the braking is smooth and controllable.
The control method of the high-pressure cycloid rotor type magnetorheological fluid retarder electric control system comprises the following steps:
s1, preparation:
s11, all the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are powered off, and the electric pump works for 0.5s,500-1000 turns and is self-lubricating;
s12, oiling 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 turns, and oil is injected into the working cavity of the retarder; then the second electromagnetic valve is powered off, the oiling is stopped, and the oil liquid directly returns to the oil storage cavity;
s2, the vehicle enters an idle stage:
s21, when the vehicle is in forward running, the retarder is in an oil pumping state: at the moment, the first electromagnetic valve is electrified, the second electromagnetic valve is deenergized, the third electromagnetic valve is deenergized, the electric pump works, and oil is pumped from the working cavity of the retarder; 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 injected into the working cavity of the retarder; then enter step S3;
s23, when the vehicle runs in reverse, 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 carried out;
s3, braking by a retarder:
s31, when the vehicle is in gear increasing: 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 acceleration way, the unloading valve is closed, and the working cavity of the retarder is closed; energizing and magnetizing the electromagnetic coil of the porous plate, and increasing the pressure in the working cavity of the retarder;
s32, when the vehicle is in gear shifting 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 perforated plate is powered on and magnetized;
s33, when the vehicle is at constant speed: and dynamically controlling the gear increase and decrease 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 understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The 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 perforated 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 an oil storage cavity (19) when the power is off, and the first electromagnetic valve (18) is connected with a 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 retarder main loop is opened when the third electromagnetic valve (23) is electrified; the retarder working cavity is connected with a perforated plate electromagnetic coil (13), and when the perforated plate electromagnetic coil (13) is electrified, an 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 retarder working cavity, the unloading valve is controlled to be opened and closed by the electric pump (17), and when the unloading valve is closed, the retarder working cavity 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 the 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;
the input port of the unloading valve is connected with the high-pressure cavity of the retarder working cavity, and the output port of the unloading valve is connected with the low-pressure cavity of the retarder working cavity;
the right side of the piston in the unloading valve body is provided with a return spring, when the left side of the piston is not pressurized, the piston is in an open state under the action of the spring, and the retarder working cavity cannot build pressure; when the retarder needs to be loaded to generate braking force, the electric pump (17) establishes pressure with the unloading valve, so that the piston of the unloading valve is in a closed state, a working cavity of the retarder is closed to generate pressure, the loading action of the system is realized, and the braking force is generated;
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 is increased;
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.
2. A high pressure cycloidal rotor magnetorheological fluid retarder electronic control system according to claim 1, wherein the electric pump (17) is provided with an electric pump safety valve (20).
3. The control method of the high-pressure cycloidal rotor type magnetorheological fluid retarder electric control system according to claim 1, comprising the following steps:
s1, preparation:
s11, all the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are powered off, and the electric pump works for 0.5s,500-1000 turns and is self-lubricating;
s12, oiling 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 turns, and oil is injected 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 stage:
s21, when the vehicle is in forward running, the retarder is in an oil pumping state: at the moment, the first electromagnetic valve is electrified, the second electromagnetic valve is deenergized, the third electromagnetic valve is deenergized, the electric pump works, and oil is pumped from the working cavity of the retarder; 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 injected into the working cavity of the retarder; then enter step S3;
s23, when the vehicle runs in reverse, 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 carried out;
s3, braking by a retarder:
s31, when the vehicle is in gear increasing: 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 acceleration way, the unloading valve is closed, and the working cavity of the retarder is closed; energizing and magnetizing the electromagnetic coil of the porous plate, and increasing the pressure in the working cavity of the retarder;
s32, when the vehicle is in gear shifting 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 perforated plate is powered on and magnetized;
s33, when the vehicle is at constant speed: and dynamically controlling the gear increase and decrease according to the initial speed of braking, and keeping the vehicle speed.
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| CN114922920A (en) | 2022-08-19 |
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