CN112112956A

CN112112956A - Hydraulic control system of gearbox

Info

Publication number: CN112112956A
Application number: CN202010927869.6A
Authority: CN
Inventors: 敖鹭; 梁志海; 姜旭义
Original assignee: Getec Vehicle Technology Suzhou Co ltd
Current assignee: Getec Vehicle Technology Suzhou Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2020-12-22

Abstract

The invention discloses a hydraulic control system of a gearbox, which is suitable for a hybrid gearbox and comprises an oil tank and an oil suction path for outputting hydraulic oil, wherein oil outlets of a first mechanical pump and a second mechanical pump form a main oil path, the main oil path forms a cooling oil path after passing through a cooler, and the cooling oil path conveys the cooled hydraulic oil to a first motor, a second motor, a gearbox gear set, an input shaft, an output shaft and a clutch for lubricating and cooling; two parallel oil paths are arranged in the cooling oil path conveyed to the first motor, a throttling hole for limiting the flow is arranged in the first oil path, a switch valve is arranged in the second oil path, the switch valve is a two-position two-way valve and is in a normally closed state, and the pressure of the driving side of the switch valve is equal to the pressure of an oil outlet of the first mechanical pump. The invention has the following beneficial effects: the selection of the amount of lubricating and cooling oil can be carried out according to different working conditions of the hybrid transmission case, and the method is efficient and reliable.

Description

Hydraulic control system of gearbox

Technical Field

The invention relates to the technical field of automobiles, in particular to a hydraulic control system of a gearbox.

Background

With the environmental pollution and increasingly strict fuel consumption and emission regulations at home and abroad, various automobile companies are forced to develop power systems with ultrahigh fuel economy, and a hybrid power system which gives consideration to both fuel economy and technical maturity becomes an ideal choice at the present stage. Hybrid vehicles employ hybrid drive technology, the power sources of which include a hybrid electric machine and an engine. The hybrid driving technology is that a driving motor is added in a traditional engine gearbox power system to complete hybrid output of power of an engine and the motor.

Similar hybrid transmissions on the market typically operate with shifting and cooling performed separately, typically with oil cooling for motor cooling and electronic or clutch operators for clutch and synchronizer shifting, thus separating the shifting and clutch control from motor cooling, increasing system cost and also increasing system space.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a hydraulic control system suitable for a hybrid gearbox.

The purpose of the invention is realized by the following technical scheme:

a hydraulic control system of a gearbox is suitable for a hybrid gearbox, the hybrid gearbox comprises a first motor and a first mechanical pump which are mechanically and directly connected with an input shaft of an engine, a second mechanical pump which is mechanically and directly connected with a differential mechanism through an output shaft, and a second motor which is mechanically and directly connected with the differential mechanism, the hydraulic control system of the gearbox comprises an oil tank for providing hydraulic oil and an oil suction path for outputting the hydraulic oil, and the oil suction path is respectively communicated with an oil inlet of the first mechanical pump and an oil inlet of the second mechanical pump through a suction filter; the oil outlets of the first mechanical pump and the second mechanical pump form a main oil path, the main oil path forms a cooling oil path after passing through a cooler, and the cooling oil path conveys the cooled hydraulic oil to the first motor, the second motor, a gear set of a gearbox, an input shaft, an output shaft and a clutch for lubricating and cooling; two parallel oil paths are arranged in the cooling oil path conveyed to the first motor, a throttling hole for limiting the flow is arranged in the first oil path, a switch valve is arranged in the second oil path, the switch valve is a two-position two-way valve and is in a normally closed state, and the pressure of the driving side of the switch valve is equal to the pressure of an oil outlet of the first mechanical pump.

Preferably, the hydraulic oil conveyed to the cooler by the main oil path passes through a fine filter, and a first check valve is connected to the fine filter in parallel.

Preferably, the fine filter and the first one-way valve are externally arranged on the gearbox.

Preferably, a second check valve is connected to a pipeline of the main oil path at the oil outlet of the second mechanical pump, and a third check valve is connected in parallel to one side of the second mechanical pump.

Preferably, a pressure regulating valve is connected to a pipeline of the main oil path at the oil outlet of the first mechanical pump, a pilot valve is connected to a driving side of the pressure regulating valve, and the pilot valve is a switching valve or a proportional valve.

Preferably, a drain valve is arranged between the main oil path and the oil tank.

Preferably, an overflow valve is arranged between the oil outlet of the first mechanical pump and the oil tank, and the driving side pressure of the overflow valve is equal to the pressure of the oil outlet of the first mechanical pump.

Preferably, an oil outlet of the first mechanical pump controls the closing of a clutch in the gearbox after passing through a cut-off valve, and the cut-off valve forms a passage after receiving the oil pressure of the main oil passage after being adjusted by the pressure regulating valve.

Preferably, the hybrid transmission case includes a first clutch and a second clutch, the hydraulic oil output from the oil outlet of the first mechanical pump forms two parallel branches, the closing of the first clutch and the closing of the second clutch are respectively controlled, and the hydraulic oil output from the oil outlet of the first mechanical pump enters the two branches after passing through an electromagnetic valve respectively.

Preferably, the two branches are provided with interlocking valves, each interlocking valve consists of two identical two-position three-way valves, the disconnection driving end of each two-position three-way valve is connected to the closing driving end of the other two-position three-way valve, and the two branches are respectively provided with an energy accumulator and a pressure sensor.

Preferably, the electromagnetic valve is a switch valve or a proportional valve, or a large-flux mechanical valve, and a control side of each large-flux mechanical valve is connected with a secondary pilot valve.

The invention has the following beneficial effects:

(1) when the hybrid transmission is under a pure electric driving working condition, namely the first motor P1 does not work and only the second motor P3 works, the first motor P1 can be lubricated and cooled by hydraulic oil with a small flow rate; when the hybrid transmission case is in a long-time reversing and low-speed climbing state, the engine is switched on to work, the first motor P1 directly connected mechanically also works at the same time, and the lubricating and cooling of the first motor P1 can select large-flow hydraulic oil; the oil quantity is selected according to different working conditions, so that the efficiency is high and the reliability is high;

(2) through the arrangement of the relief valve, the overflow valve and the cut-off valve, multi-stage safety protection is formed;

(3) through the arrangement of the interlocking valve, the double clutches of the hybrid transmission can not work simultaneously, and the risk of failure of the transmission is reduced;

(4) the clutch closing control branch is provided with the switch valve, so that the cost can be reduced; by using the proportional valve, the closing control of the clutch can be smoother; the large-flux mechanical valve with the two-stage pilot is used, the response speed of the clutch closing can be higher, the size of the mechanical valve can be adjusted according to actual needs, and the applicability is wide.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1: the invention is applicable to the structural schematic diagram of the gearbox;

FIG. 2: a schematic diagram of a preferred embodiment of the transmission hydraulic control system of the present invention;

FIG. 3: a schematic diagram of a second embodiment of a transmission hydraulic control system of the present invention;

FIG. 4: a schematic diagram of a third embodiment of a transmission hydraulic control system of the present invention;

FIG. 5: a schematic diagram of a fourth embodiment of the transmission hydraulic control system of the present invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The invention discloses a hydraulic control system suitable for a hybrid transmission, which is a dual-clutch hybrid transmission as shown in fig. 1 and comprises a first clutch C1, a second clutch C2, a first motor P1 and a first mechanical pump MOP1 which are mechanically and directly connected with an input shaft of an engine, a second mechanical pump MOP2 which is mechanically and directly connected with a differential through an output shaft, and a second motor P3 which is mechanically and directly connected with the differential, wherein two clutches C1 and C2 are respectively sleeved on the input shaft and the output shaft, and a gear pair is arranged between the input shaft and the output shaft. The hydraulic control system of the gearbox is suitable for the double-clutch hybrid gearbox.

In the preferred embodiment shown in fig. 2, the hydraulic control system of the gearbox comprises an oil tank 1 for supplying hydraulic oil and an oil suction path 2 for outputting the hydraulic oil, wherein the oil suction path 2 is respectively communicated with an oil inlet of the first mechanical pump MOP1 and an oil inlet of the second mechanical pump MOP2 through a suction filter 3.

The oil outlets of the first mechanical pump MOP1 and the second mechanical pump MOP2 form a main oil path 100. The main oil path 100 is connected to a pressure regulating valve 10 on a pipeline at an oil outlet of the first mechanical pump MOP1, the pressure regulating valve 10 is used for regulating the oil pressure of the main oil path, a pilot valve 14 is connected to a driving side of the pressure regulating valve 10, and the pilot valve 14 may be an on-off valve or a proportional valve. If a proportional valve is adopted, the oil pressure is generally controlled to be 2-8bar, and the proportional valve is a linear change process and is more smoothly controlled.

A second check valve 7 is connected to a pipeline of the main oil path 100 at an oil outlet of the second mechanical pump MOP2, and a third check valve 6 is connected in parallel to one side of the second mechanical pump MOP 2. The third check valve 6 is used for driving the second mechanical pump MOP2 to rotate reversely when the vehicle backs up to drive the differential to rotate reversely, so that the check valve 6 can obtain oil from the main oil way, and further protect the second mechanical pump MOP 2. The second check valve 7 is used for preventing high-pressure oil from entering the second mechanical pump MOP2 under a normal state and also plays a protection role.

The main oil path 100 forms a cooling oil path after passing through a cooler 5, and the cooling oil path conveys cooled hydraulic oil to the first motor P1, the second motor P3, a gearbox gear set, an input shaft, an output shaft and a clutch for lubrication and cooling.

The hydraulic oil delivered to the cooler 5 by the main oil path 100 passes through a fine filter 4, and a first check valve 8 is connected in parallel to the fine filter 4. The first non return valve 8 serves to protect the fine filter 4. In order to reduce costs and achieve high integration, the fine filter 4 and the first non-return valve 8 may also be arranged externally on the gearbox.

A drain valve 12 is further disposed between the main oil passage 100 and the oil tank 1. The function of the drain valve 12 is to drain away excess hydraulic oil. When the vehicle is at a high speed, the differential drives the second mechanical pump MOP2 to rotate at a very high speed, so that the second mechanical pump MOP2 works fast to cause a surplus of hydraulic oil flow, and the drain valve 12 can drain the surplus flow. In addition, the drain valve 12 may also protect the second mechanical pump MOP2 if jamming occurs outside the gearbox.

In the preferred embodiment, two oil paths connected in parallel are provided in the cooling oil path fed to the first motor P1, a throttle hole 90 for limiting the flow is provided in the first oil path, a switch valve 9 is provided in the second oil path, the switch valve 9 is a two-position two-way valve, and is in a normally closed state, and the driving side pressure of the switch valve is equal to the pressure of the oil outlet of the first mechanical pump MOP 1. When the hybrid transmission is under a pure electric driving working condition, namely the first motor P1 does not work and only the second motor P3 works, the first motor P1 can select low-flow hydraulic oil for lubrication and cooling, so that the switch valve 9 does not work, and the hydraulic oil enters the first motor P1 through the throttling hole 90 in a flow limiting manner; when the hybrid transmission case is in backing a car for a long time and climbing at a low speed, the engine is started to be connected to work, or other engines need to work under the working condition, then the first motor P1 directly connected mechanically also works simultaneously to generate oil pressure, the switch valve 9 moves leftwards to work, the lubricating and cooling of the first motor P1 can select large-flow hydraulic oil through the switch valve 9, and the lubricating and cooling of the first motor P1 is increased. Therefore, the oil quantity can be selected according to different working conditions, and the oil quantity control device is efficient and reliable.

The invention has primary protection: an overflow valve 11 is arranged between the oil outlet of the first mechanical pump MOP1 and the oil tank 1, and the driving side pressure of the overflow valve is equal to the pressure of the oil outlet of the first mechanical pump MOP 1. The purpose of the relief valve 11 is: if the oil path is blocked, the high oil pressure is relieved, and the MOP1 of the first mechanical pump is protected. In the present preferred embodiment, the control end oil pressure is equal to the control end oil pressure of the on-off valve 9. Of course, a primary protection is not necessary and the device may be omitted for cost reasons.

In this preferred embodiment, the hybrid transmission includes a first clutch C1 and a second clutch C2, and hydraulic oil output from an oil outlet of the first mechanical pump MOP1 forms two parallel branches to control the closing of the first clutch C1 and the second clutch C2, respectively, and hydraulic oil output from an oil outlet of the first mechanical pump MOP1 enters the two branches after passing through one

electromagnetic valve

15, 16, and drives the closing of the first clutch C1 or the second clutch C2, respectively. And the two branches are provided with an energy accumulator 17 and a pressure sensor 20, and the energy accumulator 17 stores or releases hydraulic oil, so that the pressure of the clutch control oil way is more accurate.

The invention has two-stage protection: an oil outlet of the first mechanical pump MOP1 passes through a cut-off valve 13 and then enters the two branches to control the closing of a clutch in the gearbox, and the cut-off valve 13 forms a passage after receiving oil pressure in a main oil way. The use of this shut-off valve 13: when the clutch needs to be closed, the pilot valve 14 is electrified, and the cut-off valve 13 works at the right position. When the pressure regulating valve 10 is stuck and fails, high pressure is generated in the main oil circuit instantly, meanwhile, the electromagnetic valve 15 or the electromagnetic valve 16 is stuck and fails, the clutch cannot be opened, at this time, the pilot valve 14 is powered off, the right side of the cutoff valve 13 loses pressure, the cutoff valve 13 works in the left position, hydraulic oil returns to the oil tank 1, and the vehicle is driven only in a series connection mode. Secondary protection is of course not necessary and the device may be omitted for cost reasons.

In the preferred embodiment, the

electromagnetic valves

15 and 16 are on-off valves, which can reduce the cost.

The second embodiment, as shown in fig. 3, differs from the preferred embodiment in that: the two branches are provided with interlocking valves 18, the interlocking valves 18 are composed of two identical two-position three-way valves, the disconnection driving end of each two-position three-way valve is connected to the closing driving end of the other two-position three-way valve, so that only one branch of the two branches can pass through hydraulic oil, and the other branch is correspondingly in a disconnection state. Through the setting of interlock valve 18, can ensure that the double clutch of mixing the gearbox can not work simultaneously, reduce the risk that the gearbox became invalid. Of course, the interlock valve 18 is not necessary and the device may be omitted for cost reasons; the interlock valve 18 may also be in other forms, such as an interlock on-off valve, etc.

The third embodiment, as shown in fig. 4, differs from the second embodiment in that: the

solenoid valves

15, 16 are proportional valves. The proportional valve is controlled linearly, which allows for smoother clutch closure.

The fourth embodiment, as shown in fig. 5, differs from the second embodiment in that: the

electromagnetic valves

15 and 16 are large-flow mechanical valves, and a secondary pilot valve 19 is connected to the control side of each large-flow mechanical valve. The use of a high-flux mechanical valve may allow for a faster response to clutch closure. The secondary pilot valve 19 is powered and works on the left position, the pilot oil enters the right cavity of the mechanical valve 15, the mechanical valve 15 works on the right position, and the high-pressure oil enters the clutch through the mechanical valve. When the pilot valve 19 is de-energized and operated in the right position, the mechanical valve 15 is operated in the left position, and the oil inside the clutch is returned to the oil tank through the mechanical valve 15. The starting point of the design is that oil entering the clutch does not pass through the pilot electromagnetic valve but passes through the mechanical valve 15, and the electromagnetic valve is small in size and small in flow rate, and the size of the mechanical valve 15 can be adjusted according to actual needs, so that the applicability is wide.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. Gearbox hydraulic control system is applicable to the hybrid transmission case, the hybrid transmission case includes that machinery directly links the first motor (P1) and the first mechanical pump (MOP 1) of the input shaft of engine, through output shaft machinery directly links the second mechanical pump (MOP 2) of differential mechanism, and machinery directly links the second motor (P3) of differential mechanism, its characterized in that: the gearbox hydraulic control system comprises an oil tank (1) for providing hydraulic oil and an oil suction path (2) for outputting the hydraulic oil, wherein the oil suction path (2) is respectively communicated with an oil inlet of a first mechanical pump (MOP 1) and an oil inlet of a second mechanical pump (MOP 2) through a suction filter (3); oil outlets of the first mechanical pump (MOP 1) and the second mechanical pump (MOP 2) form a main oil path (100), the main oil path (100) forms a cooling oil path after passing through a cooler (5), and the cooling oil path conveys the cooled hydraulic oil to the first motor (P1), the second motor (P3), a gear set of a gearbox, an input shaft, an output shaft and a clutch for lubricating and cooling; two oil paths connected in parallel are arranged in a cooling oil path conveyed to the first motor (P1), a throttle hole (90) for limiting flow is arranged in the first oil path, a switch valve (9) is arranged in the second oil path, the switch valve (9) is a two-position two-way valve and is in a normally closed state, and the driving side pressure of the switch valve is equal to the pressure of an oil outlet of the first mechanical pump (MOP 1).

2. The transmission hydraulic control system of claim 1, wherein: the hydraulic oil conveyed to the cooler (5) by the main oil path (100) passes through a fine filter (4), and a first one-way valve (8) is connected to the fine filter (4) in parallel.

3. The transmission hydraulic control system of claim 2, wherein: the fine filter (4) and the first one-way valve (8) are externally arranged on the gearbox.

4. The transmission hydraulic control system of claim 1, wherein: and a second one-way valve (7) is connected to a pipeline of the main oil way (100) at an oil outlet of the second mechanical pump (MOP 2), and a third one-way valve (6) is connected to one side of the second mechanical pump (MOP 2) in parallel.

5. The transmission hydraulic control system of claim 1, wherein: the main oil way (100) is connected with a pressure regulating valve (10) on a pipeline at an oil outlet of the first mechanical pump (MOP 1), a pilot valve (14) is connected to the driving side of the pressure regulating valve (10), and the pilot valve (14) is a switch valve or a proportional valve.

6. The transmission hydraulic control system of claim 5, wherein: and a drain valve (12) is arranged between the main oil way (100) and the oil tank (1).

7. The transmission hydraulic control system of claim 5, wherein: an overflow valve (11) is arranged between the oil outlet of the first mechanical pump (MOP 1) and the oil tank (1), and the driving side pressure of the overflow valve is equal to the pressure of the oil outlet of the first mechanical pump (MOP 1).

8. The transmission hydraulic control system of claim 5, wherein: an oil outlet of the first mechanical pump (MOP 1) controls the closing of a clutch in the gearbox after passing through a cut-off valve (13), and the cut-off valve (13) forms a passage after receiving the oil pressure of a main oil way regulated by the pressure regulating valve (10).

9. The transmission hydraulic control system according to any one of claims 1 to 8, characterized in that: the hybrid transmission comprises a first clutch (C1) and a second clutch (C2), hydraulic oil output from an oil outlet of a first mechanical pump (MOP 1) forms two branches connected in parallel, the closing of the first clutch (C1) and the closing of the second clutch (C2) are controlled respectively, and the hydraulic oil output from the oil outlet of the first mechanical pump (MOP 1) enters the two branches after passing through an electromagnetic valve (15 and 16) respectively.

10. The transmission hydraulic control system of claim 9, wherein: and the two branches are provided with interlocking valves (18), each interlocking valve (18) consists of two identical two-position three-way valves, the disconnection driving end of each two-position three-way valve is connected to the closing driving end of the other two-position three-way valve, and the two branches are respectively provided with an energy accumulator (17) and a pressure sensor (20).

11. The transmission hydraulic control system of claim 9, wherein: the electromagnetic valves (15, 16) are switching valves or proportional valves or large-flux mechanical valves, and a secondary pilot valve (19) is connected to the control side of each large-flux mechanical valve.