CN109282028B - Hydraulic control system of hybrid power vehicle and control method thereof - Google Patents
Hydraulic control system of hybrid power vehicle and control method thereof Download PDFInfo
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- CN109282028B CN109282028B CN201811412568.9A CN201811412568A CN109282028B CN 109282028 B CN109282028 B CN 109282028B CN 201811412568 A CN201811412568 A CN 201811412568A CN 109282028 B CN109282028 B CN 109282028B
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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
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R17/00—Arrangements or adaptations of lubricating systems or devices
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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
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
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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
- Y02T10/62—Hybrid vehicles
Abstract
The invention relates to the field of control of hybrid vehicles, and particularly discloses a hydraulic control system and a control method of a hybrid vehicle, wherein the hydraulic control system comprises a main oil way, a cooling and lubricating oil way, a reversing valve, a first hydraulic pump, a second hydraulic pump communicated with the main oil way, a pressure regulating valve connected between the main oil way and the cooling and lubricating oil way and a first control valve for controlling the reversing valve to switch valve positions, wherein the reversing valve is positioned at the first valve position when a clutch or a brake is not required to be combined, so that the first hydraulic pump is communicated with the cooling and lubricating oil way; the reversing valve is in a second valve position when the clutch or the brake needs to be combined, so that the first hydraulic pump and the second hydraulic pump are coupled to provide hydraulic oil flow for the main oil way, and the residual flow is transmitted to the cooling and lubricating oil way. The hydraulic control system of the vehicle can reasonably match the cooling and lubricating flow and the hydraulic oil flow of the main oil way, avoid the pressure drop when the clutch is combined, prevent the abrasion and burning of parts and be beneficial to ensuring the overall efficiency and the power performance of the vehicle.
Description
Technical Field
The invention relates to the technical field of hybrid power vehicle control, in particular to a hydraulic control system and a control method of the hybrid power vehicle.
Background
In recent years, a hybrid electric vehicle is popular with more and more consumers. The power source of the oil-electricity hybrid power vehicle comprises a hybrid motor and an engine, wherein the motor consumes electric energy of a power battery, and the engine consumes fuel oil. The power and control system of the hybrid electric vehicle belongs to precise components, and main working operation components are switched under different working modes. When the driving motor is independently used as a vehicle power source, the clutch or the brake of the vehicle does not need to be engaged, and at the moment, the clutch and the like do not need to be in sliding friction engagement because the driving motor is in a high-speed running working state, so that the cooling and lubricating flow of the driving motor is larger, and the flow requirement of an oil pump of a hydraulic control system is greatly increased; when the driving motor and the engine or the auxiliary motor jointly provide power, the clutch or the brake of the vehicle is engaged, and in the switching process of the engaged state, large-flow hydraulic oil is needed to be provided for the main oil way to avoid the influence of the pressure drop of the clutch on the overall efficiency and the power performance of the vehicle, and meanwhile, the flow distribution of each cooling and lubricating oil duct is also needed to be ensured so as to meet the heat dissipation requirements of parts such as the driving motor, the bearing, the clutch and the like which run at high speed. Therefore, how to reasonably match the cooling and lubrication flow and avoid the problem of pressure drop when the clutch is engaged is a key technology of the hydraulic control system.
In the prior art, however, there are fewer solutions to the above problems, which may overheat the drive motor due to unreasonable cooling flow distribution when the clutch or brake does not need to be engaged. When the clutch or the brake is engaged, the phenomenon of insufficient oil supply capacity of the oil pump is easily caused by the influence of high and low temperature environment and other factors, so that unstable conditions such as interruption of vehicle power transmission, overlong speed regulating time, overlarge impact and the like occur in the engagement and conversion process of the clutch, and the problems of abrasion and burning of a clutch plate with high-speed friction and the like seriously influence the driving safety and driving experience.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a hydraulic control system of a hybrid electric vehicle and a control method thereof, which can reasonably match cooling lubrication flow and hydraulic oil flow of a main oil way according to whether a clutch or a brake is combined, avoid pressure drop during clutch combination, prevent the problems of abrasion, burning and the like caused by insufficient cooling lubrication oil duct flow of parts such as a driving motor, a bearing, the clutch and the like which run at high speed, and are beneficial to ensuring the overall efficiency and the power performance of the vehicle.
Based on this, the present invention provides a hydraulic control system of a hybrid vehicle, comprising:
the main oil way is communicated with the clutch and is used for providing hydraulic oil for the clutch;
the cooling and lubricating oil way is used for providing cooling oil liquid for the clutch, the driving motor and the shaft teeth;
a reversing valve having a first valve position and a second valve position, the reversing valve being in the first valve position when the clutch or brake is not required to be engaged, the reversing valve being in the second valve position when the clutch or brake is required to be engaged;
the first hydraulic pump is communicated with the cooling and lubricating oil circuit when the reversing valve is at the first valve position, and is communicated with the main oil circuit when the reversing valve is at the second valve position;
the second hydraulic pump is communicated with the main oil way;
the pressure regulating valve is connected between the main oil way and the cooling lubricating oil way;
the first control valve is connected with the main oil way and used for controlling the reversing valve to switch valve positions.
Preferably, a main oil way one-way valve which only allows hydraulic oil to flow unidirectionally from the oil outlet of the first hydraulic pump to the oil outlet of the second hydraulic pump is connected between the oil outlet of the first hydraulic pump and the oil outlet of the second hydraulic pump, and the reversing valve enables the first hydraulic pump to be communicated with the main oil way through the main oil way one-way valve when the reversing valve is positioned at the second valve position.
As a preferable scheme, the hydraulic control system further comprises a second control valve which is connected with the main oil way and used for controlling the opening of the valve port of the pressure regulating valve, and the first control valve and the second control valve are arranged in parallel;
the oil inlets of the first control valve and the second control valve are communicated with the oil outlet of the second hydraulic pump through a pressure reducing valve.
Preferably, the cooling and lubricating oil path comprises a first cooling branch, a second cooling branch and a third cooling branch which are respectively used for supplying cooling oil to the shaft teeth, the clutch and the driving motor and are communicated in parallel, a fourth cooling branch which is used for supplying cooling oil to the clutch and is communicated only when the reversing valve is in the second valve position, and a fifth cooling branch which is used for supplying cooling oil to the driving motor and is communicated only when the reversing valve is in the first valve position.
As a preferable scheme, a pressure sensor which is used for detecting the pressure value of the main oil way and is electrically connected with a whole vehicle controller of the vehicle is arranged in the main oil way; the first control valve and the second control valve are electrically connected with the whole vehicle controller.
Preferably, the hydraulic control system further comprises a third control valve which is arranged in parallel with the first control valve and the second control valve and is used for controlling a parking gear slide valve of the automobile.
As a preferable scheme, the hydraulic control system further comprises an oil cooler, wherein an oil inlet of the oil cooler is communicated with an oil outlet of the pressure regulating valve and an oil outlet of the reversing valve, and an oil outlet of the oil cooler is communicated with the cooling and lubricating oil path.
As a preferable scheme, oil outlets of the first hydraulic pump and the second hydraulic pump are respectively provided with an oil pump check valve and a filter press in sequence; the first hydraulic pump and the second hydraulic pump are electronic oil pumps and are each equipped with a motor, both driven by the respective motors.
As an optimal scheme, the whole vehicle controller increases the motor rotation speed of a normal pump when detecting that the first hydraulic pump or the second hydraulic pump fails; when the vehicle controller detects that the high-voltage electronic pump fails, the first control valve controls the reversing valve to be switched to the second valve position.
In order to achieve the same object, the invention also provides a control method of a hydraulic system of a hybrid vehicle, comprising the following steps:
step S1, judging whether a clutch or a brake of a vehicle needs to be engaged;
step S2, if the judgment result shows that engagement is not needed, the first control valve is not powered, and the reversing valve is kept at the first valve position;
and step S3, if the judgment result is that the engagement is needed, the first controller valve is high in a preset time before the engagement of the clutch or the brake, and the reversing valve is controlled to be switched to the second valve position.
Preferably, the step S2 further includes: if the judgment result in the step S1 is that the engagement is not needed, adding a cooling branch for providing cooling oil for the driving motor to the cooling and lubricating oil circuit; if the determination in step S1 is that engagement is required, a cooling branch for supplying cooling oil to the clutch is added to the cooling-lubrication oil path.
Preferably, the control method further includes step S4: and detecting the pressure value of the main oil way, and adjusting the valve opening of the pressure regulating valve according to the pressure value.
Compared with the prior art, the invention has the beneficial effects that:
the hydraulic control system of the hybrid electric vehicle comprises a first hydraulic pump, a second hydraulic pump, a main oil way, a cooling lubricating oil way, a reversing valve, a pressure regulating valve and a first control valve, wherein the first hydraulic pump and the second hydraulic pump are arranged, the reversing valve is switched between a first valve position and a second valve position, when a clutch or a brake is not required to be combined, the reversing valve is positioned at the first valve position, so that the first hydraulic pump provides required cooling oil flow for the cooling lubricating oil way, and the second hydraulic pump provides required hydraulic oil flow for the main oil way; when the clutch or the brake needs to be combined, the reversing valve is controlled by the first control valve to be switched to the second valve position, so that the first hydraulic pump and the second hydraulic pump are in a coupling working state and jointly provide required hydraulic oil flow for the main oil way, and under the requirement of meeting the pressure of the main oil way, the residual flow in the main oil way is conveyed to the cooling and lubricating oil way through the pressure regulating valve, thereby meeting the requirements of the cooling and lubricating flow and the main oil way flow in two working modes, avoiding the pressure drop during the combination of the clutch, preventing the problems of abrasion, burning and the like caused by insufficient flow of the cooling and lubricating oil ways of high-speed parts such as a driving motor, a bearing, the clutch and the like, and being beneficial to ensuring the overall efficiency and the power performance of the vehicle.
Drawings
Fig. 1 is a hydraulic schematic diagram of a hydraulic control system for a hybrid vehicle according to an embodiment of the present invention;
FIG. 2 is a hydraulic circuit diagram provided by an embodiment of the present invention when the clutch or brake is not required to be engaged;
FIG. 3 is a hydraulic circuit diagram provided by an embodiment of the present invention when a clutch or brake is to be engaged;
fig. 4 is a hydraulic oil circuit diagram of the hydraulic control system provided in the present embodiment when the first hydraulic pump fails;
fig. 5 is a hydraulic oil circuit diagram of the hydraulic control system provided in the present embodiment when the second hydraulic pump fails.
Fig. 6 is a flowchart of a control method of the hydraulic control system according to the embodiment of the present invention.
Wherein, 1, a low-pressure pump; 2. a high pressure pump; 3. a main oil path; 31. a first control valve; 32. a main oil way check valve; 33. a second control valve; 34. a pressure reducing valve; 35. a third control valve; 36. a park slide valve; 4. cooling and lubricating oil paths; 41. a first cooling branch; 42. a second cooling branch; 43. a third cooling branch; 44. a fourth cooling branch; 45. a fifth cooling branch; 46. an oil cooler; 5. a reversing valve; 6. a pressure regulating valve; 7. an oil pump check valve; 8. press filtration; 9. and (3) directly driving the electromagnetic valve.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, 2 and 3 in combination, a hydraulic control system for a hybrid vehicle of the present invention is schematically shown, including a first hydraulic pump, a second hydraulic pump, a main oil passage 3, a cooling lubrication oil passage 4, a reversing valve 5, a pressure regulating valve 6, and a first control valve 31, for example, in the present embodiment, the first hydraulic pump employs a low-pressure pump 1, and the second hydraulic pump employs a high-pressure pump 2. The main oil path 3 is communicated with the clutch and is used for providing hydraulic oil for the clutch, the cooling and lubricating oil path 4 is used for providing cooling oil for high-speed operation parts such as the clutch, the driving motor and the shaft teeth, the high-pressure pump 2 is communicated with the main oil path 3, the reversing valve 5 is provided with a first valve position (left position shown in fig. 2) and a second valve position (right position shown in fig. 3), the reversing valve 5 is in the first valve position when the clutch or the brake is not needed to be combined, and the low-pressure pump 1 and the high-pressure pump 2 are in a decoupling state at the moment, so that the low-pressure pump 1 provides required cooling oil flow for the cooling and lubricating oil path 4 and the high-pressure pump 2 provides required hydraulic oil flow for the main oil path 3. The reversing valve 5 is in a second valve position when the clutch or the brake needs to be combined, so that the low-pressure pump 1 is communicated with the main oil way 3, and the low-pressure pump 1 and the high-pressure pump 2 are in a coupling working state, so that the low-pressure pump 1 and the high-pressure pump 2 jointly provide the required hydraulic oil flow to the main oil way 3. The first control valve 31 is connected with the main oil way 3 and is used for controlling the reversing valve 5 to switch the valve position, when the first control valve 31 is in a normal low working state, namely, the reversing valve 5 is in the first valve position when power is not available, and when the first control valve 31 is in a high level, the reversing valve 5 is controlled to switch to the second valve position. A pressure regulating valve 6 is communicated between the main oil way 3 and the cooling and lubricating oil way 4, and under the condition that the requirement of the pressure of the main oil way 3 is met, the residual flow in the main oil way 3 can be conveyed to the cooling and lubricating oil way 4 through the pressure regulating valve 6 so as to meet the oil quantity requirement of the cooling and lubricating oil way 4.
When the electric quantity of the power battery of the vehicle is sufficient, the power is provided by the driving motor, the clutch and the brake are not needed to be engaged, the vehicle changes the speed by adjusting the rotating speed of the driving motor, as shown in fig. 2, the reversing valve 5 is at a first valve position, the outlet flow of the low-pressure pump 1 directly enters the cooling and lubricating oil path 4 through the reversing valve 5, and the whole Vehicle Controller (VCU) of the vehicle enables the low-pressure pump 1 to provide the outlet flow according to the preset requirement so as to meet the cooling and lubricating flow required by the high-speed operation of the driving motor and the cooling and lubricating flow required by the shaft teeth and the clutch. At the same time, the outlet flow of the high-pressure pump 2 directly enters the main oil path 3 to meet the oil pressure requirement of the main oil path 3, and under the condition that the pressure of the main oil path 3 is stable, the residual flow of the main oil path 3 can flow into the cooling and lubricating oil path 4 through the pressure regulating valve 6 to supplement the cooling and lubricating flow.
As shown in fig. 3, when the engine (or the auxiliary motor) and the driving motor are required to jointly provide power, it is determined that the clutch or the brake of the hybrid vehicle needs to be engaged, the whole vehicle controller starts to send a command to enable the engine and the driving devices of the two pumps to start speed regulation, the first control valve 31 controls the reversing valve 5 to switch to the second valve position, the outlet flow of the low-pressure pump 1 and the outlet flow of the high-pressure pump 2 are coupled and then enter the main oil way 3, so that large-flow hydraulic oil is provided for the main oil way 3, sufficient oil filling flow is ensured when the direct-drive electromagnetic valve 9 of the clutch or the brake is opened, the phenomenon of clutch pressure drop caused by insufficient flow of the main oil way 3 is avoided, and meanwhile, under the condition that the pressure of the main oil way 3 is met, the residual flow of the main oil way 3 flows into the cooling and lubricating oil way 4 through the pressure regulating valve 6, and the flow requirements of the cooling and lubricating oil way 4 are met, and the heat dissipation requirements of the driving motor, the shaft teeth and the clutch are ensured. Therefore, through adjusting the flow directions of the outlet flow rates of the low-pressure pump 1 and the high-pressure pump 2, the cooling and lubrication flow rates and the hydraulic oil flow rate of the main oil way 3 in two working modes can be reasonably matched, the pressure drop during the clutch combination is avoided, the problems of abrasion, burning and the like caused by insufficient cooling and lubrication oil duct flow rates of parts such as a driving motor, a bearing, a clutch and the like are prevented, and the overall efficiency and the power performance of the vehicle are ensured.
Specifically, a main oil way check valve 32 which only allows hydraulic oil to flow unidirectionally from the oil outlet of the low-pressure pump 1 to the oil outlet of the high-pressure pump 2 is connected between the oil outlet of the low-pressure pump 1 and the oil outlet of the high-pressure pump 2, when the reversing valve 5 is positioned at a first valve position, the oil outlet of the low-pressure pump 1 is communicated with the cooling and lubricating oil way 4, at the moment, the outlet pressure of the low-pressure pump 1 cannot be suppressed to be high, the oil pressure at the front end of the main oil way check valve 32 communicated with the oil outlet of the low-pressure pump 1 is low, the main oil way check valve 32 is in a closed state, and the outlet flow of the low-pressure pump 1 completely enters the cooling and lubricating oil way 4 to provide cooling flow for a clutch, a driving motor and shaft teeth. When the reversing valve 5 is switched to the second valve position, the oil outlet of the low-pressure pump 1 is blocked from the cooling and lubricating oil circuit 4, at the moment, the oil pressure at the outlet of the low-pressure pump 1 is blocked at the front end of the main oil circuit check valve 32 until the oil pressure is larger than the oil pressure of the main oil circuit 3, the main oil circuit check valve 32 is opened, the low-pressure pump 1 is communicated with the main oil circuit 3 through the main oil circuit check valve 32, and the flow of the oil outlet of the low-pressure pump 1 is totally converged at the outlet flow of the high-pressure pump 2 and is coupled with the high-pressure pump 2, so that large-flow hydraulic oil is provided for the main oil circuit 3.
More specifically, as shown in fig. 2 and 3, the hydraulic control system further includes a second control valve 33 connected to the main oil passage 3 for controlling the opening degree of the valve port of the pressure regulating valve 6, and preferably includes a third control valve 35 for controlling a parking spool 36 of the automobile, the first control valve 31, the second control valve 33, and the third control valve 35 being disposed in parallel. For example, the first control valve 31, the second control valve 33, and the third control valve 35 in the present embodiment may employ on-off solenoid valves. The oil inlets of the first control valve 31 and the second control valve 33 are communicated with the oil outlet of the high-pressure pump 2 through a pressure reducing valve 34, and the inlet oil pressure of the first control valve 31 and the second control valve 33 is obtained from the oil pressure of the main oil passage 3 through the pressure reducing valve 34, so that the control oil passage oil pressure meeting the requirements is formed. Preferably, a pressure sensor (not shown in the figure) electrically connected with a vehicle controller of the vehicle is arranged in the main oil way 3, the pressure sensor is used for acquiring a pressure value of the main oil way 3 and transmitting the pressure value to the vehicle controller in real time, the first control valve 31 and the second control valve 33 are electrically connected with the vehicle controller, and when the pressure sensor monitors that the pressure of the main oil way 3 changes, the vehicle controller rapidly adjusts the rotation speed of the pump and the opening size of a valve core of the pressure regulating valve 6 according to a preset control program so as to avoid the influence of the pressure change of the main oil way 3 on the gear shifting performance.
As a preferred embodiment, in order to better match the different cooling flow requirements of the various high-speed operating components in the different operating modes, the cooling and lubrication circuit 4 comprises a first cooling branch 41, a second cooling branch 42, a third cooling branch 43 for supplying cooling oil to the shaft teeth, the clutch, and the drive motor, respectively, and communicating in parallel, and a fourth cooling branch 44 for supplying cooling oil to the clutch and communicating only when the reversing valve 5 is in the second valve position, and a fifth cooling branch 45 for supplying cooling oil to the drive motor and communicating only when the reversing valve 5 is in the first valve position. In this way, when the clutch or the brake is not engaged, the reversing valve 5 is in the first valve position, the outlet flow of the low-pressure pump 1 directly enters the main flow passage of the cold-zone lubrication oil passage, then different flow rates are matched through corresponding throttle holes (such as R1, R2, R3, R4 and R5 shown in fig. 2 and 3) respectively, and the different flow rates respectively flow to the first cooling branch 41, the second cooling branch 42 and the third cooling branch 43 to respectively provide cooling flow rates for the shaft teeth, the clutch and the driving motor, and meanwhile, the cooling flow rate of the fifth cooling branch 45 (such as shown in fig. 2) is increased to the driving motor through the reversing valve 5 because the driving motor is in a high-speed operation state and the clutch and the like are not required to be in sliding friction engagement, so as to meet the cooling requirement of the driving motor and improve the use efficiency of the hydraulic system. While the clutch or brake is engaged, the clutch is slip-controlled, the clutch plates are in a high-speed friction state, and a large amount of heat is generated, and the reversing valve 5 is in the second valve position, so that the cooling flow of the fourth cooling branch 44 (shown in fig. 3) is added to the clutch until the clutch is engaged, so as to meet the cooling requirement of the clutch, thereby improving the use efficiency of the hydraulic system.
On the basis of the structure, the hydraulic control system further comprises an oil cooler 46, an oil inlet of the oil cooler 46 is communicated with the pressure regulating valve 6 and an oil outlet of the reversing valve 5, an oil outlet of the oil cooler 46 is communicated with the cooling and lubricating oil path 4, and the outlet flow of the low-pressure pump 1 enters the oil cooler 46 after passing through the reversing valve 5 and the residual flow of the main oil path 3 after passing through the pressure regulating valve 6, and then enters the cooling and lubricating oil path 4 after passing through the oil cooler 46.
According to the hydraulic control system of the hybrid electric vehicle based on the technical characteristics, the oil outlets of the low-pressure pump 1 and the high-pressure pump 2 are sequentially provided with the oil pump check valve 7 and the filter pressing 8, so that the outlet flow of the low-pressure pump 1 and the outlet flow of the high-pressure pump 2 are required to enter the main oil way 3 or the cooling lubricating oil way 4 after passing through the oil pump check valve 7 and the filter pressing 8 in sequence, the outlet flow of the two pumps can be prevented from flowing back by the arrangement of the oil pump check valve 7, and the oil discharged by the two pumps can be filtered by the filter pressing 8, so that impurities are prevented from entering the oil way. The low-pressure pump 1 and the high-pressure pump 2 are electronic oil pumps and are both provided with motors, the two are driven by the respective motors, and the rotating speeds of the motors are controlled by the whole vehicle controller according to different working conditions. Of course, in other embodiments, the low-pressure pump 1 and the high-pressure pump 2 may be other types of oil pumps, as long as the functions of the present invention can be achieved, and the details thereof will not be repeated herein.
Further preferably, the vehicle controller increases the motor rotation speed of the normal pump when detecting that the low pressure pump 1 or the high pressure pump 2 fails, and the first control valve 31 controls the switching valve 5 to switch to the second valve position when the vehicle controller detects that the high pressure electronic pump fails. Referring to fig. 4, if the low pressure pump 1 fails and the high pressure pump 2 is operating normally, in a state where the clutch or brake is not engaged, the flow of the main oil path 3 is provided by the high pressure pump 2 and is not affected, but the cooling and lubrication oil path 4 cannot obtain the flow directly provided by the low pressure pump 1, and only the residual flow of the main oil path 3 can be obtained, at this time, the vehicle controller increases the rotation speed of the motor of the high pressure pump 2, increases the outlet flow of the high pressure pump 2, and increases the residual flow of the main oil path 3 under the condition of ensuring that the oil pressure of the main oil path 3 is unchanged, so as to meet the flow requirement of the cooling and lubrication oil path 4 as much as possible; in a state where the clutch or the brake is engaged, the main oil passage 3 lacks the flow rate which the low pressure pump 1 is merged into, the oil amount of the main oil passage 3 is reduced, and at this time, the vehicle controller increases the rotation speed of the motor of the high pressure pump 2, and increases the flow rate which enters the main oil passage 3, so as to ensure the stability of the oil pressure and the residual oil amount of the main oil passage 3. Referring to fig. 5, if the high pressure pump 2 fails and the low pressure pump 1 is operating normally, the main oil passage 3 cannot obtain oil in a state where the clutch or brake is not engaged, and at this time, the motor speed of the low pressure pump 1 is increased, the first control valve 31 controls the reversing valve 5 to switch to the second valve position, so that the outlet flow of the low pressure pump 1 cannot enter the cooling and lubrication oil passage 4 through the reversing valve 5, but enters the main oil passage 3 through the main oil passage one-way valve 32, providing oil for the main oil passage 3, and the remaining oil enters the cooling and lubrication oil passage 4 through the pressure regulating valve 6; in a state where the clutch or the brake is engaged, the inlet flow rate of the main oil passage 3 is reduced, and at this time, the motor rotation speed of the low-pressure pump 1 is increased, and the inlet flow rate of the main oil passage 3 is increased to meet the demand as much as possible. Therefore, under the condition that a single pump fails, the other pump can meet the complete functional requirement of the hydraulic control system, the automobile can still keep the basic running function within a certain time, and the adaptability of the automobile to the extreme conditions is improved.
In order to solve the same technical problem, the present invention also provides a control method of a hydraulic control system of a hybrid vehicle, which uses the hydraulic control system in the above embodiment, as shown in fig. 6, and specifically includes the following steps:
step S1, judging whether a clutch or a brake of a vehicle needs to be engaged;
step S2, if the judgment result shows that engagement is not needed, the first control valve 31 is not powered, and the reversing valve 5 is kept at a first valve position;
in step S3, if the determination result is that engagement is required, the first control valve 31 is set high for a predetermined time before the clutch or brake is engaged, and the control switching valve 5 is switched to the second valve position.
Specifically, the first control valve 31 is not powered when the initial state is set, the reversing valve 5 is at the first valve position, the low pressure pump 1 directly provides cooling flow for the cooling lubrication oil path 4, at this time, the whole vehicle controller continuously monitors the working condition of the hybrid vehicle, determines whether the clutch or the brake needs to be engaged, if it is determined that the engagement is not needed, maintains the state that the first control valve 31 is not powered, if it is determined that the clutch or the brake needs to be engaged, the whole vehicle controller immediately provides the first control valve 31 with a high level, the first control valve 31 controls the reversing valve 5 to switch to the second valve position within a preset time before the clutch or the brake is engaged, so that the outlet flow of the low pressure pump 1 is coupled with the outlet flow of the high pressure pump 2 through the main oil path one-way valve 32, and large flow of hydraulic oil is provided for the main oil path 3, the preset time is required to ensure that the sufficient hydraulic oil coupling of the low pressure pump 1 and the high pressure pump 2 is obtained within the time from when the reversing valve 5 is switched to the second valve position to the clutch or the brake is opened, that the high pressure pump 1 is fully coupled when the clutch or the brake is engaged, so that the phenomenon that the high pressure pump 3 is not coupled with the clutch or the high pressure pump 3 is caused by the large flow of hydraulic oil is avoided when the clutch or the clutch is fully coupled is not coupled.
Preferably, step S2 further comprises: if the judging result in the step S1 is that the engagement is not needed, the driving motor is in a high-speed running working state at the moment, and the clutch and the like do not need to be in sliding friction engagement, and a cooling branch for providing cooling oil for the driving motor is added to the cooling lubricating oil circuit 4 so as to increase the cooling oil quantity of the driving motor; if the determination in step S1 is that engagement is required, the clutch is subjected to slip control to generate a large amount of heat, and a cooling branch for supplying cooling oil to the clutch is added to the cooling-lubrication oil passage 4 to increase the clutch cooling oil amount.
As a preferred embodiment, the control method further includes step S4: the pressure value of the main oil path 3 is detected, and the valve opening of the pressure regulating valve 6 is regulated according to the pressure value, so that the influence of the pressure change of the main oil path 3 on the gear shifting performance is avoided.
In other embodiments, the first control valve 31, the second control valve 33, and the third control valve 35 may be hydraulic valves, so long as the functions of the present invention are achieved, and the description thereof will not be repeated.
In summary, the hydraulic control system of the hybrid vehicle of the present invention can reasonably match the cooling and lubrication flow and the hydraulic oil flow of the main oil path according to whether the clutch or the brake is combined, avoid the pressure drop during the clutch combination, prevent the problems of abrasion, burning, etc. caused by insufficient cooling and lubrication oil passage flow of the parts running at high speed, such as the driving motor, the bearing, the clutch, etc., and be favorable for ensuring the overall efficiency and the power performance of the vehicle. The basic running function of the vehicle can be maintained through the other pump under the condition that the single pump fails, and the adaptability of the vehicle to the extreme conditions is improved.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (11)
1. A hydraulic control system of a hybrid vehicle, characterized by comprising:
the main oil way is communicated with the clutch and is used for providing hydraulic oil for the clutch;
the cooling and lubricating oil way is used for providing cooling oil liquid for the clutch, the driving motor and the shaft teeth;
a reversing valve having a first valve position and a second valve position, the reversing valve being in the first valve position when the clutch or brake is not required to be engaged, the reversing valve being in the second valve position when the clutch or brake is required to be engaged;
the first hydraulic pump is communicated with the cooling and lubricating oil circuit when the reversing valve is at the first valve position, and is communicated with the main oil circuit when the reversing valve is at the second valve position;
the second hydraulic pump is communicated with the main oil way;
the pressure regulating valve is connected between the main oil way and the cooling lubricating oil way;
the first control valve is connected with the main oil way and used for controlling the reversing valve to switch valve positions;
when the whole vehicle controller detects that the first hydraulic pump or the second hydraulic pump fails, the motor rotating speed of the normal pump is increased; when the vehicle controller detects that the high-voltage electronic pump fails, the first control valve controls the reversing valve to be switched to the second valve position.
2. The hydraulic control system of a hybrid vehicle according to claim 1, wherein a main oil passage check valve that allows only one-way flow of hydraulic oil from the oil outlet of the first hydraulic pump to the oil outlet of the second hydraulic pump is connected between the oil outlet of the first hydraulic pump and the oil outlet of the second hydraulic pump, and the reversing valve communicates the first hydraulic pump with the main oil passage through the main oil passage check valve when in the second valve position.
3. The hydraulic control system of a hybrid vehicle according to claim 1, further comprising a second control valve connected to the main oil passage for controlling a valve port opening degree of the pressure regulating valve, the first control valve and the second control valve being provided in parallel;
the oil inlets of the first control valve and the second control valve are communicated with the oil outlet of the second hydraulic pump through a pressure reducing valve.
4. The hybrid vehicle hydraulic control system of claim 1, wherein the cooling and lubrication circuit includes a first cooling branch, a second cooling branch, and a third cooling branch each for providing cooling oil to the shaft teeth, the clutch, and the drive motor and communicating in parallel, and a fourth cooling branch for providing cooling oil to the clutch and communicating only when the reversing valve is in the second valve position, and a fifth cooling branch for providing cooling oil to the drive motor and communicating only when the reversing valve is in the first valve position.
5. The hydraulic control system of a hybrid vehicle according to claim 3, wherein a pressure sensor for detecting a pressure value of the main oil passage and electrically connected to a vehicle controller of the vehicle is provided in the main oil passage; the first control valve and the second control valve are electrically connected with the whole vehicle controller.
6. The hybrid vehicle hydraulic control system of claim 3, further comprising a third control valve disposed in parallel with the first control valve and the second control valve for controlling a park slide valve of the vehicle.
7. The hydraulic control system of a hybrid vehicle according to any one of claims 1 to 6, further comprising an oil cooler, an oil inlet of the oil cooler being in communication with an oil outlet of the pressure regulating valve and an oil outlet of the reversing valve, an oil outlet of the oil cooler being in communication with the cooling and lubrication oil passage.
8. The hydraulic control system of a hybrid vehicle according to any one of claims 1 to 6, wherein oil outlets of the first hydraulic pump and the second hydraulic pump are each provided with an oil pump check valve and a filter press in order; the first hydraulic pump and the second hydraulic pump are electronic oil pumps and are both provided with motors, and both are driven by the motors;
the first hydraulic pump adopts a low-pressure pump, and the second hydraulic pump adopts a high-pressure pump.
9. A control method of a hydraulic system of a hybrid vehicle, characterized by using the hydraulic control system according to any one of claims 1 to 8, comprising the steps of:
step S1, judging whether a clutch or a brake of a vehicle needs to be engaged;
step S2, if the judgment result shows that engagement is not needed, the first control valve is not powered, and the reversing valve is kept at the first valve position;
and step S3, if the judgment result is that the engagement is needed, the first control valve is high in a preset time before the engagement of the clutch or the brake, and the reversing valve is controlled to be switched to the second valve position.
10. The control method of a hydraulic system of a hybrid vehicle according to claim 9, characterized in that the step S2 further includes: if the judgment result in the step S1 is that the engagement is not needed, adding a cooling branch for providing cooling oil for the driving motor to the cooling and lubricating oil circuit; if the determination in step S1 is that engagement is required, a cooling branch for supplying cooling oil to the clutch is added to the cooling-lubrication oil path.
11. The control method of the hydraulic system of the hybrid vehicle according to claim 9, characterized by further comprising step S4: and detecting the pressure value of the main oil way, and adjusting the valve opening of the pressure regulating valve according to the pressure value.
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| CN110219971B (en) * | 2019-05-14 | 2021-10-12 | 中国第一汽车股份有限公司 | Electric hydraulic cooling and lubricating system of automatic transmission and control system thereof |
| CN110594400B (en) * | 2019-09-16 | 2020-10-30 | 义乌吉利自动变速器有限公司 | Hydraulic control system for hybrid power gearbox |
| CN112879464B (en) * | 2019-11-29 | 2022-09-27 | 上海汽车集团股份有限公司 | Hybrid hydraulic control system and control method |
| CN113757356B (en) | 2020-06-02 | 2023-07-28 | 广州汽车集团股份有限公司 | Vehicle hydraulic control system and method |
| CN113833624B (en) * | 2020-06-08 | 2023-04-07 | 比亚迪股份有限公司 | Supercooling protection system of vehicle and vehicle |
| CN113932006B (en) * | 2021-10-29 | 2022-12-27 | 蜂巢传动系统(江苏)有限公司保定研发分公司 | Hydraulic control system of DHT (continuously variable Transmission) |
| CN115045879A (en) * | 2022-06-06 | 2022-09-13 | 中国第一汽车股份有限公司 | Flow distribution control method and device for hydraulic oil pump, storage medium and processor |
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