CN116572915A - Control method of hydraulic retarder system, hydraulic retarder system and vehicle - Google Patents

Control method of hydraulic retarder system, hydraulic retarder system and vehicle Download PDF

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Publication number
CN116572915A
CN116572915A CN202310727147.XA CN202310727147A CN116572915A CN 116572915 A CN116572915 A CN 116572915A CN 202310727147 A CN202310727147 A CN 202310727147A CN 116572915 A CN116572915 A CN 116572915A
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CN
China
Prior art keywords
oil
braking torque
hydraulic
vehicle
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310727147.XA
Other languages
Chinese (zh)
Inventor
韩旭
于跃
贾玉哲
柳英杰
李健华
费钟鸣
张书郡
李喆
张伟男
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FAW Jiefang Automotive Co Ltd
Original Assignee
FAW Jiefang Automotive Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Jiefang Automotive Co Ltd filed Critical FAW Jiefang Automotive Co Ltd
Priority to CN202310727147.XA priority Critical patent/CN116572915A/en
Publication of CN116572915A publication Critical patent/CN116572915A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
    • B60T10/02—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope with hydrodynamic brake
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2210/00—Detection or estimation of road or environment conditions; Detection or estimation of road shapes
    • B60T2210/10—Detection or estimation of road conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2220/00—Monitoring, detecting driver behaviour; Signalling thereof; Counteracting thereof
    • B60T2220/04—Pedal travel sensor, stroke sensor; Sensing brake request
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2250/00—Monitoring, detecting, estimating vehicle conditions
    • B60T2250/04—Vehicle reference speed; Vehicle body speed
    • 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
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

The invention relates to the technical field of vehicles, and particularly discloses a control method of a hydraulic retarder system, the hydraulic retarder system and a vehicle, wherein the control method of the hydraulic retarder system determines the actual required braking torque of the vehicle based on the driving parameters of the vehicle by acquiring the driving parameters of the vehicle; acquiring the temperature of hydraulic oil; correcting the actual required braking torque based on the temperature of the hydraulic oil to obtain corrected braking torque; obtaining the maximum available braking torque of the hydrodynamic retarder; when the corrected braking torque is not greater than the maximum available braking torque, the hydraulic retarder outputs the corrected braking torque, and the hydraulic retarder directly pumps hydraulic oil into the hydraulic retarder through the oil passing pump to reduce the speed of the vehicle so as to ensure timely response, so that advanced control is not needed, control logic can be simplified, and the finally output braking torque is determined according to specific running parameters of the vehicle and the temperature of hydraulic oil, can be highly matched with the current working condition of the vehicle, and can effectively ensure driving safety.

Description

Control method of hydraulic retarder system, hydraulic retarder system and vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to a control method of a hydraulic retarder system, the hydraulic retarder system and a vehicle.
Background
The hydraulic retarder utilizes the damping effect of liquid flow to generate reverse dragging braking force opposite to the forward driving force so as to slow down the vehicle and play an auxiliary braking role. The device can be used for working conditions of downhill, and can replace a main brake to reduce the speed of the vehicle when a driver actively decelerates, so that the service life of a main brake system and the safety of the vehicle are ensured.
When the hydraulic retarder works, the output braking torque is required to be dynamically regulated in real time, and the fast, accurate and stable control of the output torque of the retarder is realized, but the existing hydraulic retarder is usually controlled by adopting high-pressure gas, so that the control flow is longer, and the control of the electric-gas-liquid three is involved.
In addition, the existing hydraulic retarder is generally opened manually by a driver and is used on a long downhill slope, so that abrasion to a friction type braking system is reduced, most drivers still get used to stepping on the brake only, and the hydraulic retarder is difficult to ensure to be opened correctly only by subjective operation of people. In this regard, in the prior art, as disclosed in the earlier patent with the application number CN202010705074.0, a control method of a hydraulic retarder is disclosed, prediction and advanced control are performed based on the road information in front, and the hydraulic retarder is started at a proper time, so as to solve the problem of false triggering and relieving the response delay of the hydraulic retarder in the existing control, but the control logic is complicated, the obtained road information in front is limited to cloud storage data, the difference between the obtained road information and the actual situation is larger (such as scattering of obstacles on the road), the application range is limited, and the driving safety can be affected.
Disclosure of Invention
The invention aims at: the hydraulic retarder system and the control method thereof are provided for solving the problems that the control method of the retarder system in the prior art has postponement, the control logic is complex due to the scheme of advanced control, the application range is limited, and the driving safety is influenced.
In one aspect, the present invention provides a hydraulic retarder system comprising a hydraulic retarder driven by hydraulic oil, and an oil pump for driving the flow of said hydraulic oil, the hydraulic retarder system comprising:
acquiring running parameters of a vehicle, wherein the running parameters of the vehicle comprise the speed of the vehicle, the current gear of a transmission, the current position of an accelerator pedal, the current position of a brake pedal and the gradient of the vehicle;
determining an actual required braking torque of the vehicle based on the driving parameters of the vehicle;
acquiring the temperature of the hydraulic oil;
correcting the actual required braking torque based on the temperature of the hydraulic oil and obtaining corrected braking torque, wherein the corrected braking torque is not greater than the actual required braking torque;
obtaining the maximum available braking torque of the hydrodynamic retarder;
comparing the magnitude of the corrected braking torque with the maximum available braking torque;
if the corrected braking torque is not greater than the maximum available braking torque;
the hydrodynamic retarder outputs the modified braking torque.
As a preferred technical solution of the control method of the hydrodynamic retarder system, if the corrected braking torque is greater than the maximum available braking torque;
the hydrodynamic retarder outputs said maximum available braking torque.
As a preferable technical scheme of the control method of the hydrodynamic retarder system, the outputting of the corrected braking torque by the hydrodynamic retarder includes:
determining a demanded displacement of the oil pump based on the corrected braking torque;
the oil pump operates at the demand displacement.
As a preferred technical solution of the control method of the hydraulic retarder system, the control method of the hydraulic retarder system further comprises, after the oil pump is operated at the required displacement:
determining a required oil pressure of hydraulic oil delivered to the hydrodynamic retarder based on the corrected braking torque;
acquiring the actual oil pressure of the hydraulic oil conveyed to the hydraulic retarder;
comparing the actual oil pressure with the required oil pressure;
if the actual oil pressure is greater than the required oil pressure, reducing the required displacement of the oil pump by a set value; and repeating the obtaining of the actual oil pressure of the hydraulic oil delivered to the hydrodynamic retarder;
if the actual oil pressure is smaller than the required oil pressure, increasing the required displacement of the oil pump by a set value, and repeating the steps of obtaining the actual oil pressure of the hydraulic oil conveyed to the hydraulic retarder;
and ending if the actual oil pressure is equal to the required oil pressure.
As a preferable technical scheme of the control method of the hydraulic retarder system, correcting the actual required braking torque based on the temperature of the hydraulic oil and obtaining a corrected braking torque includes:
judging whether the temperature of the hydraulic oil is between a first set temperature and a second set temperature, wherein the first set temperature is smaller than the second set temperature;
if yes, the corrected braking torque=the actual required braking torque; n is a constant and less than 1;
if not, the temperature of the hydraulic oil is smaller than the first set temperature; the corrected braking torque=the actual required braking torque.
As a preferable technical scheme of the control method of the hydraulic retarder system, when judging whether the temperature of the hydraulic oil is between a first set temperature and a second set temperature, if not, the temperature of the hydraulic oil is greater than the second set temperature; the corrected braking torque=0.
In another aspect, the present invention further provides a hydraulic retarder system for implementing the control method of the hydraulic retarder system described in any of the above schemes, where the hydraulic retarder system includes:
the hydraulic retarder is provided with an input port and an output port, wherein the input port is connected with a first circulation pipeline, and the output port is connected with a second circulation pipeline;
the heat exchanger is respectively connected with the first circulating pipeline and the second circulating pipeline;
the first control valve is arranged on the first circulation pipeline and used for controlling the opening degree of the first circulation pipeline;
the second control valve is arranged on the second circulation pipeline and is used for controlling the opening of the second circulation pipeline;
the pressure sensor is arranged on the second circulating pipeline;
the temperature sensor is arranged on the second circulating pipeline;
the oil pump is used for supplying oil to the second circulating pipeline;
an oil replenishment check valve disposed between the oil pump and the oil sump, the oil replenishment check valve configured to allow only oil to flow from the oil sump to the oil pump;
and an overflow device connecting the second circulation line and the oil sump and configured to be opened only when the oil pressure in the second circulation line is higher than a set value.
As the preferable technical scheme of the hydraulic retarder system, the hydraulic retarder system further comprises a filter arranged between the oil supplementing one-way valve and the oil pump.
As the preferable technical scheme of the hydraulic retarder system, the hydraulic retarder system further comprises a throttle valve arranged between the oil pool and the oil pump, and the throttle valve and the oil supplementing one-way valve are arranged in parallel.
In a further aspect, the invention provides a vehicle comprising a hydrodynamic retarder system as described in any of the above aspects, the vehicle further comprising a wheel end brake system for braking the wheels.
The beneficial effects of the invention are as follows:
the invention provides a control method of a hydraulic retarder system, the hydraulic retarder system and a vehicle, wherein the control method of the hydraulic retarder system determines the actual required braking torque of the vehicle based on the running parameters of the vehicle by acquiring the running parameters of the vehicle; acquiring the temperature of hydraulic oil; correcting the actual required braking torque based on the temperature of the hydraulic oil to obtain corrected braking torque; obtaining the maximum available braking torque of the hydrodynamic retarder; comparing the magnitude of the corrected braking torque with the maximum available braking torque; when the corrected braking torque is not greater than the maximum available braking torque, the hydrodynamic retarder outputs the corrected braking torque. According to the control method of the hydraulic retarder system, the hydraulic oil is directly pumped into the hydraulic retarder through the oil pump to reduce the speed of the vehicle, compared with the scheme of high-pressure gas control in the prior art, the hydraulic retarder system responds timely, so that advanced control is not needed, and the control logic can be simplified; in the control method of the hydraulic retarder system, the actual required braking torque of the vehicle is firstly determined according to the specific running parameters in the running process of the vehicle, and then the actual required braking torque is corrected through the temperature of hydraulic oil to obtain corrected braking torque, so that the corrected braking torque can be highly matched with the current working condition of the vehicle, and the driving safety can be effectively ensured.
Drawings
FIG. 1 is a schematic diagram of a hydraulic retarder system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method of controlling a hydraulic retarder system according to an embodiment of the invention;
fig. 3 is a second flowchart of a control method of the hydraulic retarder system according to an embodiment of the invention.
In the figure:
1. a hydrodynamic retarder; 2. a heat exchanger; 3. a first control valve; 4. a second control valve; 5. a pressure sensor; 6. a temperature sensor; 7. an oil pump; 8. an oil supplementing one-way valve; 9. an overflow check valve; 10. a first circulation line; 11. a second circulation line; 12. a water temperature sensor; 13. a throttle valve; 14. a filter; 15. a controller; 16. and (5) an oil pool.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first location" and "second location" are two distinct locations and wherein the first feature is "above," "over" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is level above the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
Example 1
As shown in fig. 1, the present embodiment provides a hydraulic retarder system comprising a hydraulic retarder 1, a heat exchanger 2, a first control valve 3, a second control valve 4, a pressure sensor 5, a temperature sensor 6, an oil pump 7, an oil supplementing one-way valve 8 and an overflow device.
The oil pump 7 may be a variable pump, the hydrodynamic retarder 1 has an input port and an output port, the input port is connected with a first circulation pipeline 10, the output port is connected with a second circulation pipeline 11, and the heat exchanger 2 is respectively connected with the first circulation pipeline 10 and the second circulation pipeline 11. The hydrodynamic retarder 1-the first circulation line 10-the heat exchanger 2 and the second circulation line 11 constitute a circulation circuit, the oil pump 7 is used for supplying oil to the second circulation line 11, the oil supplementing one-way valve 8 is arranged between the oil pump 7 and the oil sump 16, and the oil supplementing one-way valve 8 is configured to only allow oil to flow from the oil sump 16 to the oil pump 7. The hydraulic oil supplied by the oil pump 7 enters the second circulation pipeline 11 and merges the hydraulic oil flowing out of the output port of the hydraulic retarder 1, flows into the heat exchanger 2 after being mixed, flows into the first circulation pipeline 10 after being cooled by the heat exchanger 2, and is conveyed to the hydraulic retarder 1. According to the hydraulic retarder system provided by the embodiment, the hydraulic oil is directly pumped into the hydraulic retarder 1 through the oil pump 7 to reduce the speed of the vehicle, compared with the scheme of high-pressure gas control in the prior art, the hydraulic retarder system is timely in response and high in control precision.
In this embodiment, the working chamber of the hydrodynamic retarder 1 has a bladed stator and a bladed rotor, which rotates with the drive shaft. When the hydrodynamic retarder 1 works, the oil pump 7 drives hydraulic oil to enter the working cavity, the rotor rotates at a high speed, oil is beaten on the stator, and a reaction force, namely a braking moment, is generated, so that the effect of reducing the speed of the vehicle is achieved (the more the hydraulic oil is, the larger the reaction is). While generating a large amount of heat energy to be absorbed by the hydraulic oil.
Wherein, the heat exchanger 2 is a liquid-liquid heat exchanger. The heat exchanger 2 has a primary side and a secondary side, which can exchange heat, wherein the first circulation line 10 and the second circulation line 11 are connected to the primary side, and both ends of the secondary side are respectively connected to an external input line and an external output line, which are used for circulating cooling liquid and can be connected to a cooling circulation system of the engine. Wherein, the external output pipeline is provided with a water temperature sensor 12.
The first control valve 3 is disposed in the first circulation line 10 and is used for controlling the opening of the first circulation line 10; the second control valve 4 is provided in the second circulation line 11, and is used to control the opening degree of the second circulation line 11. Specifically, the on-off of the first circulation pipeline 10 and the flow area of the first circulation pipeline 10 after being communicated can be controlled through the first control valve 3, so that the flow of the hydraulic oil conveyed into the hydraulic retarder 1 can be controlled. The on-off of the second circulation pipeline 11 and the flow area of the second circulation pipeline 11 after being communicated can be controlled through the second control valve 4. Wherein, the first control valve 3 and the second control valve 4 are two-position three-way mechanical control valves, and the opening of the mechanical control valves is related to the oil pressure in the first circulation pipeline 10, and when the oil pressure in the first circulation pipeline 10 exceeds the preset oil pressure, the two mechanical control valves are opened. Wherein the set oil pressure may be slightly greater than the pressure established in the first circulation line 10 when the oil pump 7 rotates at the minimum rotational speed; when the hydraulic retarder 1 is in a non-working state, in order to ensure lubrication of other components in the hydraulic retarder system, the oil pump 7 can rotate at a minimum rotation speed, so that hydraulic oil cannot enter the working cavity of the hydraulic retarder 1, and no-load loss can be avoided.
The overflow device connects the second circulation line 11 and the oil sump 16 and is configured to be opened only when the oil pressure in the second circulation line 11 is higher than a set value, so as to prevent the oil pressure in the second circulation line 11 and the first circulation line 10 from exceeding the set value, and to perform an overload protection function. In this embodiment, the overflow device may use an overflow check valve. In other embodiments, a relief valve may also be used.
The pressure sensor 5 is specifically disposed in the second circulation line 11, and is configured to detect an oil pressure of the hydraulic oil flowing through the second circulation line 11, and the temperature sensor 6 is disposed in the second circulation line 11, and is configured to detect an oil temperature of the hydraulic oil flowing through the second circulation line 11.
Optionally, the hydraulic retarder system further comprises a filter 14 arranged between the oil charging non-return valve 8 and the oil pump 7. The hydraulic oil pumped from the oil sump 16 into the second circulation line 11 can be filtered by the provision of the filter 14 to ensure that the hydraulic oil is clean.
Optionally, the hydraulic retarder system further comprises a throttle valve 13 arranged between the oil sump 16 and the oil pump 7, and the throttle valve 13 and the oil supplementing one-way valve 8 are arranged in parallel. By providing the throttle valve 13, diversified pumping requirements of the oil pump 7 can be ensured. Specifically, when the hydraulic retarder 1 works, the oil pump 7 can absorb oil from the oil pool 16 through the oil supplementing one-way valve 8 and the throttle valve 13, when the hydraulic retarder 1 does not work, in order to ensure lubrication of other structures in the hydraulic retarder system, the oil pump 7 can rotate at the minimum rotation speed, the oil pump 7 can not build pressure to open the oil supplementing one-way valve 8, and at the moment, the throttle valve 13 can still be kept open, so that normal oil circulation can be ensured. Preferably, the throttle valve 13 and the oil-compensating one-way valve 8 are connected in parallel and then connected in series with the filter 14, so that the filter 14 can also filter the hydraulic oil fed from the throttle valve 13 into the second circulation line 11.
The hydraulic retarder system further comprises a controller 15, the controller 15 is connected with the pressure sensor 5, the temperature sensor 6, the water temperature sensor 12 and the oil pump 7 respectively, so that the controller 15 can acquire the oil pressure of the hydraulic oil detected by the pressure sensor 5, the oil temperature of the hydraulic oil detected by the temperature sensor 6, the water temperature of the cooling liquid detected by the water temperature sensor 12 and control the required displacement of the oil pump 7.
The whole vehicle controller can obtain the running parameters of the vehicle through various sensors arranged on the whole vehicle. Specifically, be provided with speed sensor, gear sensor, accelerator pedal position sensor, brake pedal position sensor and gyroscope in the whole car all with whole car controller connection to whole car controller accessible speed sensor can detect the speed of vehicle, through the gear sensor gear of detecting the vehicle, through accelerator pedal position sensor detection accelerator pedal's position, through brake pedal position sensor detectable brake pedal's position, through the slope that the vehicle is current to be located of gyroscope detectable. In this embodiment, the controller 15 is further connected to the whole vehicle controller through a bus, so that the controller 15 can directly obtain the running parameters of the vehicle through interaction with the whole vehicle controller. The controller 15 may also control the demanded displacement of the oil pump 7 based on the obtained actual oil pressure of the hydraulic oil, the temperature of the hydraulic oil or the temperature of the coolant, and the driving parameters, so as to control the braking torque of the output of the hydrodynamic retarder 1.
The embodiment also provides a vehicle comprising the hydraulic retarder system, and further comprising a wheel end braking system for braking wheels. When the vehicle descends and the driver brakes, the hydraulic retarder system and the wheel end braking system can be matched to realize deceleration control of the vehicle. Of course, the vehicle may also be equipped with other braking systems, such as engine braking systems, so that a variety of braking modes can be ensured.
Example two
The present embodiment provides a method for controlling a hydraulic retarder system, which may be implemented by the hydraulic retarder system in the first embodiment.
As shown in fig. 2, the control method of the hydrodynamic retarder system comprises the following steps.
S100: the driving parameters of the vehicle are acquired.
The running parameters of the vehicle comprise the speed of the vehicle, the current gear of the transmission, the current position of the accelerator pedal, the current position of the brake pedal and the gradient of the vehicle. The controller can acquire the running parameters of the vehicle through interaction with the whole vehicle controller.
S200: an actual demanded brake torque of the vehicle is determined based on a travel parameter of the vehicle.
The first association relation between the running parameters of the vehicle and the actual required braking torque is prestored in the controller, and the corresponding actual required braking torque can be inquired from the first association relation based on the obtained running parameters of the vehicle. The first association may be obtained through a plurality of preliminary experiments.
S300: the temperature of the hydraulic oil is obtained.
The controller can acquire the temperature of the hydraulic oil through a temperature sensor.
S400: and correcting the actual required braking torque based on the temperature of the hydraulic oil and obtaining corrected braking torque.
Wherein the corrected braking torque is not greater than the actual required braking torque. The step S400 can be used to adjust the ratio of the braking torque to the actual demand according to the temperature of the hydraulic oil, so that the obtained corrected braking torque can be compatible with the current situation of the temperature of the hydraulic oil. Because with the temperature rising to certain degree, its heat exchange ability also will decline, and then can influence the braking effect of hydraulic retarber to correct actual demand braking torque through the temperature of hydraulic oil, can effectively protect hydraulic retarber, and can guarantee that braking effect is stable.
Specifically, correcting the actual required braking torque based on the temperature of the hydraulic oil and obtaining a corrected braking torque includes the steps of:
s4001: and judging whether the temperature of the hydraulic oil is between a first set temperature and a second set temperature, wherein the first set temperature is smaller than the second set temperature.
If yes, executing S4002; if not, and the temperature of the hydraulic oil is less than the first set temperature, executing S3003; if not, and the temperature of the hydraulic oil is greater than the second set temperature, S4004 is executed.
S4002: corrected braking torque = actual required braking torque n; n is a constant and less than 1; specifically, in the present embodiment, the first set temperature is exemplarily set to 160 ℃, the second set temperature is exemplarily set to 180 ℃, and n is exemplarily set to 80%. In other embodiments, the values of the first set temperature, the second set temperature, and n may be adjusted according to actual requirements.
S4003: corrected braking torque = actual required braking torque.
S4004: corrected braking torque=0.
Correction of the actual required braking torque based on the temperature of the hydraulic oil can be achieved through the above steps S4001 to S4004. In other embodiments, the actual required braking torque may be corrected based on the temperature of the coolant and the corrected braking torque may be obtained. Because the coolant and the hydraulic oil exchange heat in the heat exchanger, the temperature of the coolant indirectly reflects the current state of the temperature of the hydraulic oil, the temperature of the coolant has an equivalent reference value compared to the temperature of the hydraulic oil. In another embodiment, the controller may pre-store the temperature of the hydraulic oil, the actual required braking torque and the map of the corrected braking torque, and query the corresponding corrected braking torque from the map through the obtained temperature of the hydraulic oil and the actual required torque, where the map may be obtained through a large number of previous tests.
S500: the maximum available braking torque of the hydrodynamic retarder is obtained.
The maximum available braking torque of the hydrodynamic retarder is related to the specific model of the hydrodynamic retarder and is pre-stored in the controller.
S600: the magnitude of the corrected braking torque is compared with the maximum available braking torque.
If the corrected braking torque is not greater than the maximum available braking torque; s700 is performed; if the corrected braking torque is greater than the maximum available braking torque, S800 is performed.
S700: the hydrodynamic retarder outputs a corrected braking torque.
Specifically, as shown in fig. 3, in S700, the hydraulic retarder output correction braking torque includes the steps of:
s7001: the demanded displacement of the oil pump is determined based on the corrected braking torque.
The second association relation between the corrected braking torque and the required displacement of the oil pump is prestored in the controller, and the corresponding required displacement of the oil pump can be inquired from the second association relation based on the corrected braking torque. The second association may be obtained through a number of preliminary experiments. The required displacement of the oil pump mainly comprises the rotating speed of the oil pump and the flow of hydraulic oil flowing through the oil pump.
S7002: the oil pump operates at a demand displacement.
S7003: the required oil pressure of the hydraulic oil delivered to the hydrodynamic retarder is determined based on the corrected braking torque.
A third association relation between the corrected braking torque and the required oil pressure is prestored in the controller, and the corresponding required oil pressure can be inquired from the third association relation based on the corrected braking torque. The third association can be obtained by a large number of preliminary experiments.
S7004: the actual oil pressure of the hydraulic oil fed to the hydrodynamic retarder is obtained.
The controller may obtain the actual oil pressure of the hydraulic oil fed to the hydrodynamic retarder by means of a pressure sensor.
S7005: comparing the actual oil pressure with the required oil pressure;
if the actual oil pressure is greater than the required oil pressure, then S7006 is executed; if the actual oil pressure is less than the required oil pressure, S7007 is executed; if the actual oil pressure is equal to the required oil pressure, ending.
S7006: reducing the required displacement of the oil pump by a set value; and S7004 is repeated.
S7007: the required displacement of the oil pump is increased by the set value, and S7004 is repeated.
It will be appreciated that the demanded displacement is calibration data and that intuitively measuring the displacement is relatively cumbersome, so that it can be intuitively reflected by the oil pressure of the hydraulic oil, since there is a direct proportional relationship between displacement and oil pressure. The actual working condition is complex and changeable, and when the oil pump works with the required displacement, the situation that the actual oil pressure of the hydraulic oil and the required oil pressure of the hydraulic oil are different possibly exists, so that the required oil pressure of the hydraulic oil can be subjected to closed-loop adjustment through the steps S7003 to S7007, and the purpose of adjusting the final displacement of the oil pump can be achieved.
S800: the hydrodynamic retarder outputs a maximum available braking torque.
It should be noted that when the hydraulic retarder outputs the maximum available braking torque, the hydraulic retarder can only be maintained for a short time, and if the duration is too long, the temperature of the hydraulic oil and the temperature of the cooling liquid can rise very rapidly, so that the normal operation of the hydraulic retarder is affected. Therefore, after the hydrodynamic retarder outputs the maximum available braking torque, it is necessary to exit the current state in time within a prescribed time.
According to the control method of the hydraulic retarder system, the actual required braking torque of the vehicle is determined based on the running parameters of the vehicle by acquiring the running parameters of the vehicle; acquiring the temperature of hydraulic oil; correcting the actual required braking torque based on the temperature of the hydraulic oil to obtain corrected braking torque; obtaining the maximum available braking torque of the hydrodynamic retarder; comparing the magnitude of the corrected braking torque with the maximum available braking torque; when the corrected braking torque is not greater than the maximum available braking torque, the hydrodynamic retarder outputs the corrected braking torque. According to the control method of the hydraulic retarder system, the hydraulic oil is directly pumped into the hydraulic retarder through the oil pump to reduce the speed of the vehicle, compared with the scheme of high-pressure gas control in the prior art, the hydraulic retarder system responds timely, so that advanced control is not needed, and the control logic can be simplified; in the control method of the hydraulic retarder system, the actual required braking torque of the vehicle is firstly determined according to the specific running parameters in the running process of the vehicle, and then the actual required braking torque is corrected through the temperature of hydraulic oil to obtain corrected braking torque, so that the corrected braking torque can be highly matched with the current working condition of the vehicle, and the driving safety can be effectively ensured.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. A method of controlling a hydraulic retarder system comprising a hydraulic retarder driven by hydraulic oil and an oil pump for driving the flow of said hydraulic oil, characterized in that it comprises:
acquiring running parameters of a vehicle, wherein the running parameters of the vehicle comprise the speed of the vehicle, the current gear of a transmission, the current position of an accelerator pedal, the current position of a brake pedal and the gradient of the vehicle;
determining an actual required braking torque of the vehicle based on the driving parameters of the vehicle;
acquiring the temperature of the hydraulic oil;
correcting the actual required braking torque based on the temperature of the hydraulic oil and obtaining corrected braking torque, wherein the corrected braking torque is not greater than the actual required braking torque;
obtaining the maximum available braking torque of the hydrodynamic retarder;
comparing the magnitude of the corrected braking torque with the maximum available braking torque;
if the corrected braking torque is not greater than the maximum available braking torque;
the hydrodynamic retarder outputs the modified braking torque.
2. A method of controlling a hydrodynamic retarder system according to claim 1, characterized in that if the corrected braking torque is greater than the maximum available braking torque;
the hydrodynamic retarder outputs said maximum available braking torque.
3. A method of controlling a hydrodynamic retarder system according to claim 1, wherein the hydrodynamic retarder outputting the modified braking torque comprises:
determining a demanded displacement of the oil pump based on the corrected braking torque;
the oil pump operates at the demand displacement.
4. A method of controlling a hydraulic retarder system according to claim 3, characterised in that the method of controlling a hydraulic retarder system further comprises, after the oil pump is operated at the required displacement:
determining a required oil pressure of hydraulic oil delivered to the hydrodynamic retarder based on the corrected braking torque;
acquiring the actual oil pressure of the hydraulic oil conveyed to the hydraulic retarder;
comparing the actual oil pressure with the required oil pressure;
if the actual oil pressure is greater than the required oil pressure, reducing the required displacement of the oil pump by a set value; and repeating the obtaining of the actual oil pressure of the hydraulic oil delivered to the hydrodynamic retarder;
if the actual oil pressure is smaller than the required oil pressure, increasing the required displacement of the oil pump by a set value, and repeating the steps of obtaining the actual oil pressure of the hydraulic oil conveyed to the hydraulic retarder;
and ending if the actual oil pressure is equal to the required oil pressure.
5. The control method of a hydraulic retarder system according to claim 1, wherein correcting the actual required braking torque and obtaining a corrected braking torque based on the temperature of the hydraulic oil comprises:
judging whether the temperature of the hydraulic oil is between a first set temperature and a second set temperature, wherein the first set temperature is smaller than the second set temperature;
if yes, the corrected braking torque=the actual required braking torque; n is a constant and less than 1;
if not, the temperature of the hydraulic oil is smaller than the first set temperature; the corrected braking torque=the actual required braking torque.
6. The control method of a hydraulic retarder system according to claim 5, wherein when judging whether the temperature of the hydraulic oil is between a first set temperature and a second set temperature, if not, and the temperature of the hydraulic oil is greater than the second set temperature; the corrected braking torque=0.
7. A hydrodynamic retarder system, characterized in that it is used for implementing a control method of a hydrodynamic retarder system according to any of claims 1-6, which comprises:
the hydraulic retarder is provided with an input port and an output port, wherein the input port is connected with a first circulation pipeline, and the output port is connected with a second circulation pipeline;
the heat exchanger is respectively connected with the first circulating pipeline and the second circulating pipeline;
the first control valve is arranged on the first circulation pipeline and used for controlling the opening degree of the first circulation pipeline;
the second control valve is arranged on the second circulation pipeline and is used for controlling the opening of the second circulation pipeline;
the pressure sensor is arranged on the second circulating pipeline;
the temperature sensor is arranged on the second circulating pipeline;
the oil pump is used for supplying oil to the second circulating pipeline;
an oil replenishment check valve disposed between the oil pump and the oil sump, the oil replenishment check valve configured to allow only oil to flow from the oil sump to the oil pump;
and an overflow device connecting the second circulation line and the oil sump and configured to be opened only when the oil pressure in the second circulation line is higher than a set value.
8. The hydraulic retarder system of claim 7, further comprising a filter disposed between the oil make-up check valve and the oil pump.
9. The hydraulic retarder system of claim 7, further comprising a throttle valve disposed between the oil sump and the oil pump, and wherein the throttle valve and the oil make-up check valve are disposed in parallel.
10. A vehicle comprising a hydrodynamic retarder system according to any of claims 7-9, the vehicle further comprising a wheel end brake system for braking the wheels.
CN202310727147.XA 2023-06-19 2023-06-19 Control method of hydraulic retarder system, hydraulic retarder system and vehicle Pending CN116572915A (en)

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CN202310727147.XA CN116572915A (en) 2023-06-19 2023-06-19 Control method of hydraulic retarder system, hydraulic retarder system and vehicle

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117465393A (en) * 2023-12-27 2024-01-30 临工重机股份有限公司 Composite brake control system and control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117465393A (en) * 2023-12-27 2024-01-30 临工重机股份有限公司 Composite brake control system and control method

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