CN113883264A

CN113883264A - Hydraulic system of hybrid power vehicle

Info

Publication number: CN113883264A
Application number: CN202111242788.3A
Authority: CN
Inventors: 卢钦强; 刘星; 王瑞雪; 蒙基伟; 周才深; 黄秩楷; 汪杰强
Original assignee: Liuzhou Saike Technology Development Co Ltd
Current assignee: Liuzhou Saike Technology Development Co Ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-01-04

Abstract

A hybrid vehicle hydraulic system for controlling engagement and disengagement of a clutch in a hybrid vehicle for providing oil cooling flow and lubrication flow. The hydraulic system comprises a double-pump oil supply module, a lubricating and cooling hydraulic control module, an oil temperature controller, an oil anti-suck-back and supplement module, a clutch hydraulic control module and an oil way module. The oil anti-suck-back and supplement module comprises a first check valve and a second check valve. The clutch hydraulic control module comprises a main oil pressure control valve, a first electromagnetic valve, a reversing valve and a second electromagnetic valve. The hydraulic system can accurately, quickly and stably control the engagement and the disengagement of the clutch, so that the vehicle has sufficient power when running at high speed, and can adaptively adjust the oil supply flow according to the cooling and lubricating flow requirements of the gearbox, thereby meeting the hydraulic flow and oil pressure requirements of the hybrid vehicle in various driving modes.

Description

Hydraulic system of hybrid power vehicle

Technical Field

The invention relates to the field of automatic transmissions of hybrid vehicles, in particular to a hydraulic system of a hybrid vehicle.

Background

The hybrid power special gearbox (DHT) adopts a dual-motor driving mode to enable the engine to continuously operate in a power range of an optimal fuel state all the time, so that the aims of improving the thermal efficiency of the engine and reducing the energy consumption are fulfilled. When the vehicle speed is lower than a certain value, the power of the vehicle is derived from the motor in the DHT, the power of the motor is provided by a battery in the vehicle, the engine is only responsible for driving the generator to charge the battery with low battery capacity, and in a high-speed state, the engine and the motor are in power coupling to provide more abundant power for the vehicle.

The motor and the generator of the vehicle with the DHT keep high-power operation for a long time, and the system cannot be maintained to normally work by relying on self heat dissipation of the DHT, so the DHT adopts an oil cooling mode to dissipate heat for the motor and the motor. Components such as motors, generators, bearings and the like of the DHT have high rotation speeds during operation, and require a certain flow of lubricating oil. In addition, the engine provides vehicle power at high speeds, the clutch needs to be kept engaged, and the hydraulic system can provide stable and reliable clamping force for the engagement of the clutch.

However, in a hydraulic system of a current vehicle, it is difficult to meet oil pressure and flow requirements of the vehicle in various modes such as pure electric (forward, reverse), hybrid, engine and the like, and it is difficult to accurately control a clutch clamping force, which affects the efficiency of the whole machine.

Disclosure of Invention

Therefore, in the hydraulic system of the current vehicle, the hydraulic pressure and flow demand of the vehicle in various modes such as pure electric (forward and backward), hybrid, engine and the like are difficult to meet, and the clutch clamping force is difficult to accurately control, so that the efficiency of the whole hydraulic system is affected.

A hybrid vehicle hydraulic system for controlling engagement and disengagement of a clutch in a hybrid vehicle for providing oil cooling flow and lubrication flow, the hydraulic system comprising:

the double-pump oil supply module is used for providing conveying power of oil liquid cooling flow and lubricating flow;

the lubricating and cooling hydraulic control module is used for distributing oil to corresponding cooling and lubricating terminals;

the oil temperature controller is used for regulating and controlling the temperature of the oil liquid conveyed to the lubricating and cooling hydraulic control module;

the oil anti-suck-back and supplement module comprises a first check valve and a second check valve;

the clutch hydraulic control module is used for controlling the connection and the disconnection of the clutch and providing a compensation flow to the lubricating and cooling hydraulic control module; the clutch hydraulic control module comprises a main oil pressure control valve, a first electromagnetic valve, a reversing valve and a second electromagnetic valve; and

and the oil circuit module is used for directional and ordered delivery of oil.

The cooling and lubricating flow of the hydraulic system can be adjusted in a self-adaptive manner, the flow demand of the DHT in different driving modes can be met, and the cooling efficiency of the DHT is improved. The hydraulic clamping force of clutch joint can be accurately, stably and quickly controlled, efficiency loss caused by surplus clutch clamping force is effectively reduced, and therefore the efficiency of the whole machine is improved. The method lays a foundation for the optimization and improvement of the structure and the control strategy of the hydraulic control system of the hybrid vehicle, and provides a new idea for the design of the hydraulic control system of the vehicle.

In one embodiment, the dual pump oil supply module includes a first oil pump and a second oil pump; a motor in the hybrid vehicle drives the first oil pump; an engine in the hybrid vehicle drives the second oil pump.

In one embodiment, the cooling and lubrication terminals are a motor, a generator and a bearing in the hybrid vehicle.

In one embodiment, the first solenoid valve receives an electric signal to control the reversing valve to be opened, and the second solenoid valve receives an electric signal to perform oil pressure regulation so that the clutch oil pressure meets the pressure requirement of clutch engagement.

In one embodiment, the clutch hydraulic control module further includes a clutch cylinder and a pressure sensor.

In one embodiment, the oil passage module includes an oil suction passage, a low pressure passage, a lubrication passage, a first main oil passage, a second main oil passage, a main oil pressure control passage, a first clutch oil passage, and a second clutch oil passage.

Further, a safety valve is fixedly installed in the lubricating oil path and used for ensuring that the oil pressure in the lubricating oil path is within a safe oil pressure range.

Furthermore, damping holes are formed in the oil suction oil path, the low-pressure oil path, the lubricating oil path, the first main oil path, the second main oil path, the main oil pressure control oil path, the first clutch oil path and the second clutch oil path in a penetrating mode; the damping holes are used for distributing oil.

In one embodiment, the hydraulic system further comprises a fuel tank, a fuel filter module and an accumulator; and oil liquid for making up leakage of the hydraulic system is stored in the energy accumulator.

Furthermore, the oil filtering module comprises a rough filtering module, a first filter screen, a second filter screen and a fine filtering module.

Compared with the prior art, the invention has the beneficial effects that:

the invention adopts a double-pump oil supply mode, provides a power source for lubricating and cooling flow of the hybrid electric vehicle in various driving modes such as pure electric, hybrid and engine driving, can adapt to the cooling and lubricating flow of the hydraulic system, meets the flow requirement of a hybrid special gearbox (DHT) in different driving modes, and improves the cooling efficiency.

According to the invention, a double one-way valve mode is adopted, so that the problem of too low oil pressure caused by reverse rotation of the first oil pump to the low-pressure oil way in a vehicle backing mode in a pure electric state is solved, the vacuum condition in the oil way can be prevented, and the reliability of a hydraulic system is improved.

According to the invention, the hydraulic clamping force for engaging the clutch can be accurately, stably and quickly controlled, and the efficiency loss caused by excessive clutch clamping force is effectively reduced, so that the efficiency of the whole machine is improved, the problem that the clutch cannot be separated when the second electromagnetic valve 19 is clamped is solved, and the safety of an oil path of the clutch is effectively ensured and the driving safety of a vehicle is ensured.

In conclusion, the cooling and lubricating flow of the hydraulic system can be adjusted in a self-adaptive manner, the flow requirements of the DHT in different driving modes can be met, and the cooling efficiency of the DHT is improved. The hydraulic clamping force of clutch joint can be accurately, stably and quickly controlled, efficiency loss caused by surplus clutch clamping force is effectively reduced, and therefore the efficiency of the whole machine is improved. The method lays a foundation for the optimization and improvement of the structure and the control strategy of the hydraulic control system of the hybrid vehicle, and provides a new idea for the design of the hydraulic control system of the vehicle.

Drawings

FIG. 1 is a block diagram of a hybrid vehicle hydraulic system according to the present invention.

FIG. 2 is a block diagram of the oil circuit module of FIG. 1 according to the present invention.

Fig. 3 is a schematic diagram of an oil circuit of a hydraulic system of a hybrid vehicle according to the present invention.

Description of the main elements

1. An oil tank; 2. a coarse filtration module; 3. an oil suction path; 4. a first oil pump; 5. a second oil pump; 6. a first check valve; 7. a low pressure oil circuit; 8. a second one-way valve; 9. a safety valve; 10. a lubrication oil path; 11. a first main oil passage; 12. a first filter screen; 13. a primary oil pressure control valve; 14. a second main oil passage; 15. a first solenoid valve; 16. a main oil pressure control oil path; 17. an accumulator; 18. a diverter valve; 19. a second solenoid valve; 20. a first clutch oil path; 21. a pressure sensor; 22. a second filter screen; 23. a second clutch oil path; 24. a clutch cylinder; 25. a fine filtration module; 26. an oil temperature controller.

The present invention is described in further detail with reference to the drawings and the detailed description.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-3, the present embodiment provides a hybrid vehicle hydraulic system for controlling the engagement and disengagement of a clutch in a hybrid vehicle for providing oil cooling flow and lubrication flow. The hydraulic system comprises a double-pump oil supply module, a lubricating and cooling hydraulic control module, an oil temperature controller 26, an oil anti-suck-back and supplement module, a clutch hydraulic control module, an oil way module, an oil tank 1, an oil filtering module and an energy accumulator 17.

Oil required for the operation of the hybrid vehicle is stored in the oil tank 1. The double-pump oil supply module provides transmission power of oil liquid cooling flow and lubricating flow. The dual pump oil supply module includes a first oil pump 4 and a second oil pump 5. The electric motor in the hybrid vehicle drives the first oil pump 4. When the hybrid vehicle is in a low-speed running state and the battery electric quantity is sufficient, the engine is in a dormant state, the motor directly drives the vehicle, the clutch is in a separated state, and at the moment, the lubricating flow and the cooling flow required by the hybrid special gearbox (DHT) are both provided by the first oil pump 4. The engine in the hybrid vehicle drives the second oil pump 5. When the vehicle is in a high-speed running state, the engine and the motor generate torque to be dynamically coupled to drive the vehicle, and in the process, the engine is in a working state and drives the second oil pump 5 to supply oil to the clutch.

In this embodiment, a dual-pump oil supply mode is adopted, so that a power source of the lubricating and cooling flow of the hybrid electric vehicle in various driving modes such as pure electric driving, hybrid driving and engine driving is provided, the cooling and lubricating flow of the hydraulic system can be adaptively adjusted, the flow demand of a hybrid special transmission (DHT) in different driving modes is met, and the cooling efficiency is improved.

The oil circuit module is used for directional and ordered delivery of oil. The oil passage module includes an oil suction oil passage 3, a low pressure oil passage 7, a lubrication oil passage 10, a first main oil passage 11, a second main oil passage 14, a main oil pressure control oil passage 16, a first clutch oil passage 20, and a second clutch oil passage 23. A safety valve 9 is fixedly installed in the lubricating oil path 10 and used for ensuring that the oil pressure in the lubricating oil path 10 is within a safe oil pressure range. Damping holes are formed in the oil suction oil path 3, the low-pressure oil path 7, the lubricating oil path 10, the first main oil path 11, the second main oil path 14, the main oil pressure control oil path 16, the first clutch oil path 20 and the second clutch oil path 23 in a penetrating mode. In the embodiment, the required lubricating and cooling flow of each component is distributed through the size of the damping hole on the corresponding oil way, and the flow distributed by each component through the damping hole meets the cooling and lubricating requirements.

The oil anti-suck-back and supplement module improves the operation stability of the hydraulic system and ensures the sensitive work of the hybrid power vehicle. The oil anti-suck-back and supplement module comprises a first check valve 6 and a second check valve 8. The second check valve 8 is used for preventing the situation that oil is sucked back to the oil tank 1 due to the fact that the first oil pump 4 rotates reversely when the vehicle is reversed, and is matched with the first check valve 6 to supplement the oil in the oil tank 1 to the low-pressure oil way 7, so that the situation of vacuum in the oil duct is prevented.

In the embodiment, a double one-way valve mode is adopted, the problem that the oil pressure caused by reversing the first oil pump 4 to the low-pressure oil way 7 is too low when the vehicle is in a pure electric state is solved, the vacuum condition in the oil way can be prevented, and the reliability of a hydraulic system is improved.

The lubricating and cooling hydraulic control module is used for distributing oil to corresponding cooling and lubricating terminals. The oil temperature controller 26 is used to regulate the temperature of the oil delivered to the lubrication cooling hydraulic control module. The oil liquid filtering module comprises a rough filtering module 2, a first filter screen 12, a second filter screen 22 and a fine filtering module 25. In this embodiment, the fluid that constitutes through coarse filtration module 2, first filter screen 12, second filter screen 22 and essence filtration module 25 filters the fluid of the circulation among the hydraulic system and filters the high quality in order to guarantee fluid to avoid the terminal loss because of the fluid quality causes, the protection dynamics of reinforcing hybrid vehicle system. The accumulator 17 stores oil for compensating the leakage of the hydraulic system.

The clutch hydraulic control module is used for controlling the connection and the disconnection of the clutch and providing compensation flow to the lubrication cooling hydraulic control module. The clutch hydraulic control module includes a main hydraulic control valve 13, a first electromagnetic valve 15, a selector valve 18, a second electromagnetic valve 19, a clutch cylinder 24, and a pressure sensor 21. When the first oil pump 4 cannot provide sufficient cooling lubrication flow, the engine drives the second oil pump 5, and the first electromagnetic valve 15 outputs an electric signal to control the oil pressure in the main oil pressure control oil path 16, so that the oil flow of the main oil pressure control valve 13 is controlled, and compensation flow is provided for the lubrication cooling hydraulic control module to meet the lubrication cooling requirement of the hydraulic system. When the vehicle is in a high-speed driving state, the clutch engagement needs to be kept for a long time, at the moment, the engine is in a working state and drives the second oil pump 5 to supply oil to the clutch, the first electromagnetic valve 15 receives an electric signal to control the opening of the reversing valve 18, the second electromagnetic valve 19 receives an electric signal for adjusting the oil pressure of the clutch oil path, and the oil pressure of the clutch oil path meets the pressure requirement of the clutch engagement through oil pressure adjustment. When the second electromagnetic valve 19 is in a stuck failure state, the clutch is separated by adjusting the reversing valve 18, so that the torque of the engine-driven vehicle is cut off, and the running safety of the vehicle is guaranteed.

This embodiment, can be accurate, stable and the hydraulic pressure clamp force of control clutch joint fast, effectively reduce the clutch clamp force and excessively cause the efficiency loss to promote complete machine efficiency, and when solving 19 jamming of second solenoid valve, the unable problem of separating of clutch effectively guarantees the safety of clutch oil way and the safety of traveling of guarantee vehicle.

The hydraulic system of the embodiment operates as follows according to different states of the hybrid vehicle:

when the hybrid vehicle is in a low-speed running state and the battery electric quantity is sufficient, the engine is in a dormant state, the motor directly drives the vehicle, the clutch is in a separated state, and at the moment, the lubricating flow and the cooling flow required by the hybrid special gearbox (DHT) are both provided by the first oil pump 4. Under the above state, the oil is pumped out from the oil tank 1 and sequentially passes through the coarse filtration module 2, the oil suction line 3 and the lubricating oil line 10 to reach the lubricating and cooling hydraulic module, and under the regulation and control of the oil temperature controller 26, the oil provides cooling and lubricating flow with proper temperature for the motor, the generator and the bearing. At the same time, the oil passes through the fine filtration module 25 to provide appropriate lubrication cooling flow to the clutch cylinder 24, thereby ensuring that lubrication flow is supplied to the clutch regardless of whether the clutch is engaged.

When the oil pressure in the lubrication oil passage 10 is too high, the relief valve 9 is opened to discharge the excessive oil pressure so that the oil pressure in the lubrication oil passage 10 is within the safe oil pressure range. When the vehicle is reversed, the first oil pump 4 rotates reversely, the second check valve 8 prevents oil from being sucked back to the oil tank 1, and meanwhile, the first check valve 6 supplements the oil in the oil tank 1 to the low-pressure oil way 7, so that the condition of vacuum in the oil way is prevented, the running stability of a hydraulic system is improved, and the sensitive work of the hybrid vehicle is guaranteed.

When the first oil pump 4 cannot provide sufficient cooling lubrication flow, the engine drives the second oil pump 5, and the first electromagnetic valve 15 outputs an electric signal to control the oil pressure in the main oil pressure control oil path 16, so that the oil flow of the main oil pressure control valve 13 is controlled, and compensation flow is provided for the lubrication cooling hydraulic control module to meet the lubrication cooling requirement of the hydraulic system. In the embodiment, the oil stored in the accumulator 17 is used to compensate the oil leaked from the hydraulic system, so as to keep the pressure of the main oil control valve 13 stable and ensure the stable flow rate of the lubricating oil in the lubricating oil path 10.

When the vehicle is in a high-speed running state, the engine and the motor generate torque power coupling to drive the vehicle, in the process, the clutch engagement needs to be kept for a long time, at the moment, the engine is in a working state and drives the second oil pump 5 to supply oil to the clutch, the first electromagnetic valve 15 receives an electric signal to control the opening of the reversing valve 18, the second electromagnetic valve 19 receives an electric signal for adjusting the oil pressure of the first clutch oil path 20 and the second clutch oil path 23, and the oil pressure of the clutch oil path meets the pressure requirement of the clutch engagement through oil pressure adjustment. In this embodiment, the reversing valve 18 is used for safety control, and when the second electromagnetic valve 19 is in the stuck failure state, the reversing valve 18 is adjusted to separate the clutch, so as to cut off the torque of the engine-driven vehicle and ensure the running safety of the vehicle.

In summary, the hydraulic system of the present embodiment has the following advantages compared to the current hydraulic system: the cooling and lubricating flow of the hydraulic system can be adjusted in a self-adaptive manner, the flow requirements of the DHT in different driving modes can be met, and the cooling efficiency of the DHT is improved. The hydraulic clamping force of clutch joint can be accurately, stably and quickly controlled, efficiency loss caused by surplus clutch clamping force is effectively reduced, and therefore the efficiency of the whole machine is improved. The method lays a foundation for the optimization and improvement of the structure and the control strategy of the hydraulic control system of the hybrid vehicle, and provides a new idea for the design of the hydraulic control system of the vehicle.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The embodiments described above are more specific and detailed, but should not be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A hybrid vehicle hydraulic system for controlling engagement and disengagement of a clutch in a hybrid vehicle for providing oil cooling flow and lubrication flow, the hydraulic system comprising:

and the oil circuit module is used for directional and ordered delivery of oil.

2. A hybrid vehicle hydraulic system as set forth in claim 1 wherein the dual pump oil supply module includes a first oil pump and a second oil pump;

a motor in the hybrid vehicle drives the first oil pump; an engine in the hybrid vehicle drives the second oil pump.

3. A hybrid vehicle hydraulic system as in claim 1, wherein the cool lubrication terminals are an electric motor, a generator and bearings in the hybrid vehicle.

4. The hydraulic system of claim 1, wherein the first solenoid valve receives an electrical signal to control opening of the directional control valve, and the second solenoid valve receives an electrical signal to perform oil pressure regulation such that clutch oil pressure meets a pressure requirement for clutch engagement.

5. The hybrid vehicle hydraulic system of claim 1, wherein the clutch hydraulic control module further includes a clutch cylinder and a pressure sensor.

6. The hybrid vehicle hydraulic system of claim 1, wherein the oil passage module includes an oil suction passage, a low pressure passage, a lubrication passage, a first main oil passage, a second main oil passage, a main oil pressure control passage, a first clutch oil passage, and a second clutch oil passage.

7. The hydraulic system for a hybrid vehicle according to claim 1 or 6, wherein a relief valve is fixedly installed in the lubricating oil passage for ensuring that the oil pressure in the lubricating oil passage is within a safe oil pressure range.

8. The hydraulic system of claim 6, wherein damping holes are formed through the oil suction passage, the low pressure passage, the lubricating oil passage, the first main oil passage, the second main oil passage, the main oil pressure control oil passage, the first clutch oil passage and the second clutch oil passage;

the damping holes are used for distributing oil.

9. A hybrid vehicle hydraulic system as in claim 1, further comprising a tank, an oil filter module and an accumulator;

and oil liquid for making up leakage of the hydraulic system is stored in the energy accumulator.

10. A hybrid vehicle hydraulic system as set forth in claim 9 wherein the oil filter module includes a coarse filter module, a first screen, a second screen, and a fine filter module.