CN214617811U - Hydraulic control system for hybrid transmission - Google Patents
Hydraulic control system for hybrid transmission Download PDFInfo
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- CN214617811U CN214617811U CN202120222009.2U CN202120222009U CN214617811U CN 214617811 U CN214617811 U CN 214617811U CN 202120222009 U CN202120222009 U CN 202120222009U CN 214617811 U CN214617811 U CN 214617811U
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Abstract
A hydraulic control system for a hybrid transmission, comprising: the oil outlet of the electronic pump is connected with the clutch control valve to form a first control loop, and the oil outlet of the first control loop is used for a pressure cavity of the clutch; an oil outlet of the mechanical pump, the fine filter and the oil cooler are sequentially connected to form a first cooling and lubricating loop; an oil outlet of the mechanical pump is connected with a hydraulic pipeline to form a second cooling and lubricating loop, and the second cooling and lubricating loop is used for being connected with a balance cavity of the clutch; the oil outlet of the electronic pump is connected with the compensation control valve to form a second control loop, the second control loop is connected with the fine filter through the compensation control valve, the controller is used for acquiring the flow of the mechanical pump, and when the flow is smaller than the flow demand requested by the system, the compensation control valve is controlled to be electrified to compensate the flow of the first cooling and lubricating loop through the electronic pump.
Description
Technical Field
The utility model relates to a derailleur control technology field especially relates to a hydraulic control system of hybrid transmission.
Background
With the continuous increase of the output of a hybrid power system, the requirements on functions, weight, arrangement, cost and the like are higher and higher, the mechanical structure of the special hybrid transmission integrating the modes of pure electric drive, hybrid power, engine drive, parking charging and the like is relatively simple, the engine works efficiently in a specific working area, the market demand is increased year by year, and the hybrid transmission is a hot spot of the current new energy automobile technical research, especially the hybrid transmission power assembly technical research.
The hydraulic control system of the multi-gear special hybrid transmission mainly comprises two major aspects of pressure control of a clutch, parking and gear shifting and cooling and lubricating control of a motor, the clutch, a gear, a bearing and the like. The existing hydraulic control system of the hybrid transmission generally adopts double mechanical pumps as a hydraulic source, utilizes various electromagnetic valves and energy accumulators to realize the flow and pressure distribution of clutch pressure control and cooling and lubricating control of a motor and the clutch, meets the pressure/flow function requirements of modes such as pure electric drive, engine drive, parking charging, series-parallel connection drive and the like, but cannot realize effective pressure/flow matching control under special working conditions such as multi-gear clutch pressure control, backing up and climbing and the like. An electronic pump is adopted to replace a mechanical pump and is used as a hydraulic source for clutch pressure control to realize clutch pressure multi-gear control, but the mechanical pump is used as a hydraulic source for cooling and lubricating control, so that the problem of pressure/flow matching control under special working conditions such as reverse climbing, low-temperature cold start, large heating amount of a motor at low speed and the like cannot be solved.
Therefore, how to design a hydraulic control system suitable for a multi-gear special hybrid transmission to meet the pressure/flow requirements of each working condition mode of the special hybrid transmission, so that the transmission achieves the best effect in the using process, the vehicle starting process is smoother, and the driving comfort is improved, which is an important subject of the research of the special hybrid transmission.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a hydraulic control system for a hybrid transmission to solve the problem that the pressure/flow requirement of each operating mode of the dedicated hybrid transmission cannot be met by the conventional hydraulic control system for a multi-gear dedicated hybrid transmission.
A hydraulic control system for a hybrid transmission, comprising: an electronic pump, a mechanical pump, a clutch control valve, a fine filter, an oil cooler, a controller and a compensation control valve connected with the controller, wherein the mechanical pump is used for connecting a main detection gear of the hybrid power transmission,
an oil outlet of the electronic pump is connected with the clutch control valve to form a first control loop, and an oil outlet of the first control loop is used for being connected with a pressure cavity of a clutch of the hybrid power transmission so as to control the action of the clutch through the clutch control valve;
an oil outlet of the mechanical pump, the fine filter and the oil cooler are sequentially connected to form a first cooling and lubricating loop, and a plurality of cooling and lubricating branches are arranged at the downstream of the first cooling and lubricating loop;
an oil outlet of the mechanical pump is connected with a hydraulic pipeline to form a second cooling and lubricating loop, and the second cooling and lubricating loop is used for being connected with a balance cavity of the clutch to provide cooling and lubricating flow for the clutch;
the oil outlet of the electronic pump is connected with the compensation control valve to form a second control loop, the second control loop is connected with the fine filter through the compensation control valve, the controller is used for acquiring the flow of the mechanical pump, and when the flow is smaller than the flow demand required by the system, the compensation control valve is controlled to be electrified to compensate the flow of the first cooling and lubricating loop through the second control loop.
Further, in the hydraulic control system, the electronic pump is an electronic bidirectional pump, an oil outlet of the electronic pump is connected with a filter press to form a third control loop, and an oil outlet of the filter press is used for being connected with an oil tank of the hybrid power transmission, so that when the pressure of the first control loop is greater than the opening pressure of the filter press, the pressure of the first control loop is relieved through the third control loop.
Further, in the hydraulic control system, an oil outlet of the mechanical pump is connected to a second check valve to form a fourth control circuit, and an oil inlet of the fourth control circuit is used for connecting an oil tank of the hybrid transmission, so that when the mechanical pump rotates reversely, oil in the oil tank is transferred to the first cooling and lubricating circuit through the fourth control circuit.
Further, in the hydraulic control system, a first check valve is connected in series to the first cooling and lubricating circuit, and the first check valve is disposed between the mechanical pump and a connection node between the second control circuit and the first cooling and lubricating circuit.
Further, in the hydraulic control system, a first throttle is connected in series to the first control circuit, the first throttle is connected between the electronic pump and the clutch control valve, and the second cooling and lubricating circuit is connected in series to a second throttle.
Further, the hydraulic control system further comprises a pressure sensor connected with the first control circuit, the pressure sensor is connected with the controller, and the controller is used for acquiring the pressure detected by the pressure sensor and sending a control signal to the electronic pump when the pressure is smaller than the system request pressure.
Further, the hydraulic control system further comprises a valve body, wherein the valve body integrates the mechanical pump, the first one-way valve, the second one-way valve, the filter press, the compensation control valve, the clutch control valve, the first throttling port, the second throttling port, the pressure sensor and pipelines among the above devices;
and the valve body is arranged inside the hybrid transmission, and a plurality of oil holes connected with an external device are arranged on the outer surface of the valve body.
Further, the above hydraulic control system, wherein the plurality of oil holes include:
a first oil hole for connecting the first cooling and lubricating circuit;
the second oil hole is used for connecting the second cooling and lubricating circuit;
the third oil hole is used for connecting the first control loop;
the fourth oil hole is used for connecting the second control loop;
the fifth oil hole is used for connecting the third control loop;
a sixth oil hole for connecting the fourth control circuit and the oil tank;
and the seventh oil hole is used for connecting the oil tank.
Further, in the hydraulic control system, the oil cooler is connected in parallel with a first bypass valve, and the first bypass valve is used for limiting a pressure drop of the oil cooler.
Further, in the hydraulic control system, a second bypass valve is connected in parallel to the inside of the fine filter, and the second bypass valve is used for limiting the pressure drop of the fine filter.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a hydraulic control system comprises simple device, has integrateed first control circuit, first cooling and lubrication return circuit, second cooling and lubrication return circuit and second control circuit. The first control circuit can quickly and reliably realize the pressure/flow matching control of the multi-gear clutch, and the clutch is cooled and lubricated through the second cooling and lubricating circuit, and the first cooling and lubricating circuit can provide cooling and lubricating flow for a motor, a gear and a bearing of the transmission.
And, the utility model provides a fluid compensation mode, through second control circuit promptly, can be with the unnecessary flow compensation of electronic pump to first cooling lubrication circuit to solve the not enough problem of fluid in the first lubrication circuit. For example, the first lubrication circuit may be oil compensated in the following application scenarios:
when the vehicle speed is low, the rotating speed of the mechanical pump is low, and the provided flow rarely carries out oil compensation on the first lubricating circuit through the second control circuit;
under working conditions such as continuous launch on an uphill, the speed of the vehicle is very low, and the mechanical pump cannot meet the requirement of large flow, the second control loop is used for carrying out oil compensation on the first lubricating loop;
during low-temperature cold start, the viscosity of oil is high, the mechanical efficiency of the system is low, the response time requirement of the system is controlled within 3s, in order to meet the lubricating requirement of an engine, a lubricating hydraulic source is provided with large starting torque and large hydraulic loss, and the problem of large starting torque and the like can be solved by compensating through a hydraulic source (an electronic pump) controlled by clutch pressure, so that the hydraulic loss is reduced;
when parking charging is carried out, the vehicle speed is zero, the mechanical pump cannot provide cooling and lubricating flow, the compensation control valve and the clutch control valve are controlled, the electronic pump is started, auxiliary cooling and lubricating are carried out through the second control loop, and the cooling and lubricating flow requirement of parking charging can be met;
when pure electric vehicle drives backs a car, the mechanical pump reverses, can provide little flow in the short time, can't satisfy the cooling and lubrication flow demand of abominable operating mode, starts the electronic pump, through the second control circuit, assists the cooling and lubrication, can satisfy the cooling and lubrication flow demand of the pure electric vehicle of backing a car.
The utility model discloses in, whole hydraulic control system mainly realizes the integration that special mixed-action transmission different work condition mode pressure/flow match through an electronic pump, a mechanical pump and two solenoid valves to entire system is comparatively simple, compact structure, and is favorable to reduce cost.
Drawings
Fig. 1 is a schematic structural diagram of a hydraulic control system of a hybrid transmission according to an embodiment of the present invention.
Description of the main element symbols: 1-an oil tank; 2-oil temperature sensor; 3-an electronic pump; 4-filter pressing; 5-a compensation control valve; 6-a first orifice; 7-clutch control valve; 8-a clutch; 9-a pressure sensor; 10-a second restriction; 11-generator spray system; 12-a first bypass valve; 13-driving the motor spray system; 14-an oil cooler; 15-fine filter; 16-a first one-way valve; 17-a second one-way valve; 18-a mechanical pump; 19-main inspection gear; 20-suction filtration; 100-valve body.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The embodiment of the invention is given in the attached drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, this embodiment is provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
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 "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a hydraulic control system of a hybrid transmission according to an embodiment of the present invention includes an electronic pump 3, a mechanical pump 18, a clutch control valve 7, an oil cooler 14, a fine filter 15, a controller (not shown), and a compensation control valve 5 connected to the controller. The electronic pump and the mechanical pump are respectively connected with an oil tank of the hybrid transmission and used for driving oil to transmit. In specific implementation, the electronic pump and the mechanical pump are connected to the oil tank through the suction filter 20, that is, an oil inlet of the suction filter 20 is connected to the oil tank, and an oil inlet of the electronic pump 3 and an oil inlet of the mechanical pump 18 are respectively connected to an oil outlet of the suction filter 20.
The oil outlet of the electronic pump 3 is connected with a clutch control valve 7 to form a first control loop, and the oil outlet of the first control loop is used for connecting a pressure cavity of a clutch 8 of the hybrid power transmission. In actual application, the oil outlet of the clutch control valve 7 is connected with the pressure cavity of the clutch 8, so that the action of the clutch is controlled through the clutch control valve 7, and the pressure/flow function requirement of the clutch is met.
Further, the first control loop is also connected with a pressure sensor 9, and an oil inlet of the pressure sensor 9 is connected with an oil outlet of the clutch control valve 7 in parallel. The pressure sensor 9 is electrically connected with the controller, and the controller is used for acquiring the pressure detected by the pressure sensor 9 and sending a control signal to the electronic pump to perform PWM control on the electronic pump when the pressure is smaller than the system request pressure.
Further, a first throttle 6 is connected in series with the first control circuit, and the size of the first throttle 6 is set according to the pressure/flow of the clutch 8. The oil inlet of the first throttle orifice 6 is connected with the oil outlet of the electronic pump 3, and the oil outlet of the first throttle orifice 6 is connected with the oil inlet of the clutch control valve.
The mechanical pump 18 is used for connecting a main detection gear 19 of the hybrid power transmission, and in the specific implementation, the mechanical pump 18 is meshed with the main detection gear 19 through an idle gear at a certain speed ratio. An oil outlet of the mechanical pump 18, the fine filter 15 and the oil cooler 14 are connected in sequence to form a first cooling and lubricating circuit, and a plurality of cooling and lubricating branches are arranged at the downstream of the first cooling and lubricating circuit. During specific implementation, the cooling and lubricating branch is provided with two spraying systems which are respectively connected with the generator spraying system 11 and the driving motor spraying system 13, and cooling and lubricating flow is provided for the motor, the gear and the bearing through the spraying systems. The size of the throttling opening of each port in the spraying system can be designed according to the requirement.
An oil outlet of the fine filter 15 is connected with an oil inlet of an oil cooler 14, an oil outlet of the oil cooler 14 is connected with oil inlets of the generator spraying system 11 and the driving motor spraying system 13, the generator spraying system 11 and the driving motor spraying system 13 are provided with a plurality of ports, and each port is designed as a throttling port.
Further, the oil cooler 14 is connected in parallel with the first bypass valve 12, and when the pressure drop of the oil cooler 14 is larger than the opening pressure of the first bypass valve 12, the oil directly enters the spraying system of the motor through the first bypass valve 12. By the arrangement of the first bypass valve 12, the pressure drop of the oil cooler 14 can be limited to ensure that the hydraulic control system works properly. An oil inlet of the first bypass valve 12 is connected with an oil inlet of the oil cooler 14, and an oil outlet of the first bypass valve 12 is connected with an oil outlet of the oil cooler 14.
Furthermore, a second bypass valve is connected in parallel inside the fine filter 15, and the opening pressure of the second bypass valve is set based on the pressure drop of the fine filter 15, so that the pressure drop of the fine filter 15 can be limited to ensure the normal work of the hydraulic control system.
The oil outlet of the electronic pump 3 is connected with the oil inlet of the compensation control valve 5 to form a second control loop, and the second control loop is connected with the oil inlet of the fine filter 15 through the compensation control valve 5. The controller is used for acquiring the oil flow of the mechanical pump, and controlling the compensation control valve 5 to be electrified when the oil flow is smaller than the flow demand requested by the system so as to compensate the flow of the first cooling and lubricating loop through the electronic pump 3.
Further, in order to prevent the compensation flow of the second control loop from flowing back to the mechanical pump 18, the first cooling and lubricating loop is provided with a first one-way valve 16, and the oil outlet of the compensation control valve 5 is connected in parallel with the oil outlet of the first one-way valve 16. The oil outlet of the mechanical pump 18 is connected with the oil inlet of the first one-way valve 16, and the oil outlet of the first one-way valve 16 is connected with the oil inlet of the fine filter 15.
The oil outlet of the mechanical pump 18 is connected with a hydraulic pipeline to form a second cooling and lubricating circuit which is used for connecting a balance cavity of the clutch 8 to provide cooling and lubricating flow for the clutch 8.
Furthermore, a second throttling orifice 10 is connected in series on the second cooling and lubricating circuit, and the second throttling orifice 10 can be designed according to the actual demand of the cooling and lubricating flow of the clutch 8. The oil outlet of the mechanical pump 18 is connected with the oil inlet of the second throttle orifice 10, and the oil outlet of the second throttle orifice 10 is connected with the balance cavity of the clutch 8.
When the clutch works, oil enters the electronic pump 3 after passing through the suction filter 20, the electronic pump 3 pumps the oil, enters the clutch control valve 7 through the first throttling port 6, at the moment, the clutch control valve 7 is in a power-on state, namely, in a left position (at the moment, the compensation control valve 5 is not powered on and is in a right position) under the control of a PWM (pulse width modulation) signal of the controller, enters a pressure cavity of the clutch 8, pressure is built, a clutch piston is pushed to compress a friction pair, torque is transmitted, the pressure sensor 9 monitors the system pressure of a first control loop, and when the pressure reaches a request pressure sent by the controller, the controller feeds back a signal to a motor of the electronic pump 3. It should be noted that the dedicated hybrid transmission cannot directly start the internal combustion engine, and therefore, the mechanical pump 18 is in an operating state at this time, and the cooling and lubrication required during the operation of the clutch 8 are realized by the mechanical pump 18 through the second cooling and lubrication oil passage.
Further, the electronic pump 3 is an electronic bidirectional pump, and an oil outlet of the electronic pump 3 is connected with a filter press 4 to form a third control loop. The oil inlet of the filter press 4 is connected with the oil outlet of the electronic pump 3 in parallel, and the oil outlet of the filter press 4 is connected with the oil tank. When the pressure of the first control loop is larger than the opening pressure of the filter pressing, the pressure of the first control loop is relieved through the third control loop.
When the pressure of the first control loop is increased sharply and is larger than a pressure threshold value set by the system, the one-way valve of the filter press 4 is opened, and unloading is started to stabilize the system pressure and reduce hydraulic loss; or the electronic pump 3 is reversed, and when the system is unloaded quickly, the sucked oil returns to the oil tank 1 through the filter screen of the filter press 4; or, when the clutch is in a gear-down working condition (such as 3 gears down 1 gear, 5 gears down 2 gears, or sudden braking and the like), part of oil enters the first control loop through the filter screen of the filter press 4 to perform flow compensation. Through the setting of filter pressing 4, can inject the system pressure of first control circuit for system pressure is higher than clutch pressure all the time slightly, realizes steady voltage, quick off-load and reversal compensation's effect, reduces the hydraulic pressure loss.
When the clutch 8 does not work, the clutch 8 needs to be quickly disengaged, the electronic pump 3 rotates reversely at the moment, oil in the clutch pressure cavity is quickly sucked back, and quick unloading is achieved.
Specifically, the working principle of the first cooling and lubricating circuit is as follows:
the oil liquid enters the oil suction cavity of the mechanical pump 18 after passing through the suction filter 20, enters the first one-way valve 16 after being pumped out by the mechanical pump 18, then enters the spraying system through the fine filter 15 and the oil cooler 14, and provides cooling and lubricating flow for a motor, a gear, a bearing and the like. When the viscosity of the low-temperature oil is too high or impurities on the surface of a filter screen in the fine filter are too much, the pressure drop (namely the pressure difference between the two ends of the fine filter and the oil cooler) is larger than the opening pressure of a second bypass valve inside the fine filter 15 and a first bypass valve 12 connected with the oil cooler 14 in parallel, a bypass circuit inside the fine filter 15 and a bypass circuit connected with the oil cooler 14 in parallel are opened, and the oil passes through a first check valve 16 and then enters the motor spraying systems 11 and 13 through the second bypass valve inside the fine filter 15 and the first bypass valve 12 connected with the oil cooler 14 in parallel.
In the embodiment, the pressure drop of the fine filter and the oil cooler can be limited by arranging the second bypass valve in the fine filter and the first bypass valve connected in parallel with the oil cooler, so that the normal work of a hydraulic control system of the special hybrid transmission case is ensured, and the safety and reliability of the hydraulic control system are improved; when the system did not reach opening pressure, fluid passed through first cooling and lubrication return circuit, but the quick matching derailleur cooling and lubrication's operating mode demand, and the secondary filter can further guarantee the cleanliness that gets into motor spraying system oil simultaneously, prevents that the motor from taking place trouble such as insulation because of impurity adsorption, and the oil cooler can guarantee to get into motor spraying system's oil temperature control at the high-efficient temperature range of working of motor to improve the cooling and lubrication effect to the motor.
The oil flow rate of the mechanical pump 18 is related to the rotation speed of the main detection gear and the oil viscosity. The oil flow rate of the mechanical pump 18 is proportional to the rotational speed of the main detection gear, and when the main detection gear rotates at a low speed, or when there is no rotational speed in parking, or when the mechanical pump is reversed in reverse and cannot support long-time flow supply, and the rotational speed in reverse is also low, the rotational speed of the mechanical pump 18 is low, and therefore the flow rate of the mechanical pump 18 is low. Also, the oil viscosity is very high at cold start at low temperatures, close to a solid, and requires a high start torque to agitate the oil, at which time the mechanical pump 18 is also at a low speed. In these cases, the controller CAN estimate the flow rate according to the rotation speed of the mechanical pump 18, and when the oil flow rate of the mechanical pump 18 cannot meet the requirement, the controller sends a signal (CAN or PWM signal) to control the compensating control valve 5 to be conducted. The compensation control valve 5 is conducted and is in a left position, the electronic pump 3 pumps the oil which passes through the suction filter 20 out, the oil enters the compensation control valve 5 and then enters the first cooling and lubricating loop to be used as auxiliary lubrication, and pressure/flow compensation under special working conditions is achieved.
The oil outlet of the mechanical pump 18 is connected with a second one-way valve 17 to form a fourth control loop. The oil outlet of the second check valve 17 is connected with the oil outlet of the mechanical pump 18, and the oil inlet of the second check valve 17 is connected with the oil tank 1 of the transmission, so that when the mechanical pump 18 rotates reversely, oil in the oil tank is transmitted to the first cooling and lubricating circuit through the fourth control circuit, and the reverse flow compensation is realized by setting the opening pressure of the second check valve.
Further, the pressure control system also comprises a valve body 100, and the valve body 100 integrates a mechanical pump 18, a first one-way valve 16, a second one-way valve 17, a filter press 4, a compensation control valve 5, a clutch control valve 7, a first throttling port 6, a second throttling port 10, a pressure sensor 9 and pipelines among the above components. This valve body 100 sets up inside special hybrid transmission, and whole hydraulic control system is located the gearbox promptly, does not have external oil pipe connection with the outside, can reduce the risk of gearbox oil leakage by a wide margin, has improved whole hydraulic control system's security, reliability and stability. The outer surface of the valve body 100 is provided with a plurality of oil holes connected with an external device, the plurality of oil holes including:
the first oil hole is used for connecting the first cooling and lubricating circuit;
the second oil hole is used for connecting the second cooling and lubricating circuit;
the third oil hole is used for connecting the first control loop;
the fourth oil hole is used for connecting the second control loop;
the fifth oil hole is used for connecting the third control loop;
the sixth oil hole is used for connecting the fourth control loop and the oil tank;
and the seventh oil hole is used for connecting the oil outlet of the suction filter.
Further, an oil temperature sensor 2 is connected to an oil tank 1 of the hybrid transmission, and the oil temperature sensor is used for monitoring the oil temperature of the oil tank and feeding the oil temperature back to the controller.
In order to control the normal operation of each oil circuit in the system, the pressure of oil at the oil outlet of a clutch control valve 7 connected in series with a first control circuit is controlled to be 0.5bar-12bar, the pressure of the first cooling and lubricating circuit is controlled to be 0-4bar, the opening pressure of a second bypass valve in a fine filter 15 is 1.02bar, and the opening pressure of the second bypass valve 12 connected in parallel with an oil cooler 14 is 1.2 bar.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A hydraulic control system for a hybrid transmission, comprising: an electronic pump, a mechanical pump, a clutch control valve, a fine filter, an oil cooler, a controller and a compensation control valve connected with the controller, wherein the mechanical pump is used for connecting a main detection gear of the hybrid power transmission,
an oil outlet of the electronic pump is connected with the clutch control valve to form a first control loop, and an oil outlet of the first control loop is used for being connected with a pressure cavity of a clutch of the hybrid power transmission so as to control the action of the clutch through the clutch control valve;
an oil outlet of the mechanical pump, the fine filter and the oil cooler are sequentially connected to form a first cooling and lubricating loop, and a plurality of cooling and lubricating branches are arranged at the downstream of the first cooling and lubricating loop;
an oil outlet of the mechanical pump is connected with a hydraulic pipeline to form a second cooling and lubricating loop, and the second cooling and lubricating loop is used for being connected with a balance cavity of the clutch to provide cooling and lubricating flow for the clutch;
the oil outlet of the electronic pump is connected with the compensation control valve to form a second control loop, the second control loop is connected with the oil inlet of the fine filter through the compensation control valve, the controller is used for acquiring the flow of the mechanical pump, and when the flow is smaller than the flow demand requested by a system, the compensation control valve is controlled to be electrified to compensate the flow of the first cooling and lubricating loop through the second control loop.
2. The hydraulic control system of claim 1, wherein the electronic pump is an electronic bi-directional pump, and an oil outlet of the electronic pump is connected to a filter press to form a third control loop, and an oil outlet of the filter press is used for connecting to an oil tank of the hybrid transmission, so that when the pressure of the first control loop is greater than the opening pressure of the filter press, the first control loop is depressurized through the third control loop.
3. The hydraulic control system of claim 2, wherein an oil outlet of the mechanical pump is connected to a second check valve to form a fourth control circuit, and an oil inlet of the fourth control circuit is connected to an oil tank of the hybrid transmission to deliver oil from the oil tank to the first cooling and lubrication circuit through the fourth control circuit when the mechanical pump is reversed.
4. The hydraulic control system according to claim 3, wherein a first check valve is connected in series to the first cooling and lubricating circuit, and the first check valve is provided between the mechanical pump and a connection node of the second control circuit and the first cooling and lubricating circuit.
5. The hydraulic control system of claim 4, wherein the first control circuit is connected in series with a first orifice connected between the electric pump and the clutch control valve, and the second cooling and lubrication circuit is connected in series with a second orifice.
6. The hydraulic control system of claim 5, further comprising a pressure sensor coupled to the first control circuit, the pressure sensor coupled to the controller, the controller configured to acquire a pressure detected by the pressure sensor and send a control signal to the electronic pump when the pressure is less than a controller requested pressure.
7. The hydraulic control system of claim 6, further comprising a valve body integrating the mechanical pump, the first one-way valve, the second one-way valve, the filter press, the override control valve, the clutch control valve, the first orifice, the second orifice, the pressure sensor, and piping between the above;
and the valve body is arranged inside the hybrid transmission, and a plurality of oil holes connected with an external device are arranged on the outer surface of the valve body.
8. The hydraulic control system of claim 7, wherein the plurality of oil holes comprises:
a first oil hole for connecting the first cooling and lubricating circuit;
the second oil hole is used for connecting the second cooling and lubricating circuit;
the third oil hole is used for connecting the first control loop;
the fourth oil hole is used for connecting the second control loop;
the fifth oil hole is used for connecting the third control loop;
a sixth oil hole for connecting the fourth control circuit and the oil tank;
and the seventh oil hole is used for connecting the oil tank.
9. The hydraulic control system as recited in claim 1 wherein said oil cooler is connected in parallel with a first bypass valve for limiting a pressure drop across said oil cooler.
10. A hydraulic control system as claimed in claim 1, wherein a second bypass valve is connected in parallel with the interior of said fine filter, said second bypass valve being adapted to limit the pressure drop across said fine filter.
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| CN202120222009.2U CN214617811U (en) | 2021-01-27 | 2021-01-27 | Hydraulic control system for hybrid transmission |
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| CN202120222009.2U CN214617811U (en) | 2021-01-27 | 2021-01-27 | Hydraulic control system for hybrid transmission |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780762A (en) * | 2021-01-27 | 2021-05-11 | 麦格纳动力总成(江西)有限公司 | Hydraulic control system for hybrid transmission |
| CN112780762B (en) * | 2021-01-27 | 2024-06-28 | 麦格纳动力总成(江西)有限公司 | Hydraulic control system of hybrid transmission |
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2021
- 2021-01-27 CN CN202120222009.2U patent/CN214617811U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780762A (en) * | 2021-01-27 | 2021-05-11 | 麦格纳动力总成(江西)有限公司 | Hydraulic control system for hybrid transmission |
| CN112780762B (en) * | 2021-01-27 | 2024-06-28 | 麦格纳动力总成(江西)有限公司 | Hydraulic control system of hybrid transmission |
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