Gearbox high-pressure system control method, gearbox high-pressure system and gearbox

Abstract

The present disclosure relates to the technical field of gearbox oil circuit system control, and particularly relates to a control method of a gearbox high-pressure system, a gearbox high-pressure system and a gearbox. The control method of the gearbox high-pressure system comprises the following steps: S1, starting the vehicle; S2, starting the electronic oil pump, the electronic oil pump is accelerated from 0 to s1 in a time period t0-t1, and the speed s1 is maintained from t1 to t2; the oil pressure of the main oil circuit is accelerated from 0 to P1 in a time period t0-t2; S3, the electronic oil pump is stopped at t2, the oil pressure of the main oil circuit starts to drop, and the electronic oil pump is started at t3; S4, the electronic oil pump reaches the speed s3 at t4, and the oil pressure of the main oil circuit drops to P3 at t5. According to the control method, by setting the value of P2, the electronic oil pump can be started in advance before the oil pressure of the main oil circuit drops to P3, so that the electronic oil pump is in a low-speed running working state, which not only slows down the time when the oil pressure drops to P3, but also eliminates the influence caused by the hysteresis of the starting of the electronic oil pump.

Description

Technical Field

[0001] This disclosure relates to the field of transmission oil circuit system control technology, and in particular to a control method for a transmission high-pressure system, a transmission high-pressure system, and a transmission. Background Technology

[0002] Hybrid vehicle transmissions typically require a hydraulic system to supply both high-pressure and low-pressure oil during normal operation, with the high-pressure oil primarily used for clutch control. Current hybrid systems need to maintain the main hydraulic circuit pressure within a set range to ensure that sufficient pressure is always available for clutch shifting.

[0003] The existing high-pressure system causes the oil pressure in the main oil circuit to fluctuate within a set range as the electronic oil pump operates and stops. When the oil pressure in the main oil circuit drops to the lowest point of the set range, the controller sends a start signal to the electronic oil pump, causing it to start rotating and increasing the oil pressure in the main oil circuit. However, due to the lag in the operation of the electronic oil pump, the oil pressure in the main oil circuit often falls below the lowest point of the set range. If a gear shift is performed at this time, the clutch cannot obtain sufficient oil pressure to engage, which may lead to slippage and other phenomena, thereby affecting transmission efficiency and driving experience. Summary of the Invention

[0004] To address the aforementioned technical problems, this disclosure provides a control method for a high-pressure system of a transmission, a high-pressure system of a transmission, and a transmission.

[0005] In a first aspect, this disclosure provides a control method for a high-voltage system of a transmission, comprising the following steps:

[0006] S1. Vehicle starts;

[0007] S2. Start the electronic oil pump. During the time period t0-t1, the speed of the electronic oil pump increases from 0 to s1, and the speed s1 is maintained from t1 to t2. During the time period t0-t2, the oil pressure in the main oil circuit increases from 0 to P1.

[0008] S3. At time t2, the electronic oil pump is turned off, and the oil pressure in the main oil circuit begins to drop. When the oil pressure in the main oil circuit drops from P1 to P2, this is time t3. At time t3, the electronic oil pump is turned on.

[0009] S4. The electronic oil pump reaches speed s3 at time t4 and maintains speed s3 until time t5. At time t5, the main oil circuit oil pressure drops to P3.

[0010] S5. During the time period t5-t6, the speed of the electronic oil pump is increased from s3 to s2, and the speed s2 is maintained from t6 to t7. At time t7, the oil pressure in the main oil circuit reaches P1.

[0011] S6. Repeat steps S3 to S5;

[0012] Among them, P1 is greater than P2, P2 is greater than P3, s1 is greater than s2, and s2 is greater than s3.

[0013] Optionally, during the time period t0-t2, the vehicle is in a ready state; after time t2, there is a gear shifting operation time.

[0014] Optionally, the value of P2 is the average of the values ​​of P1 and P3.

[0015] Optionally, when the rotational speed of the electronic oil pump is s3, the oil pressure in the main oil circuit maintains a downward trend.

[0016] Optionally, during steps S3 and S4, the accumulator is in the working state of supplying oil to the main oil circuit.

[0017] Optionally, in steps S2 and S5, the oil pressure of the main oil circuit supplies oil to the accumulator.

[0018] Optionally, P1 is the maximum operating pressure of the accumulator.

[0019] Secondly, this disclosure provides a high-pressure transmission system utilizing the control method described above, including an electronic oil pump, an accumulator, and a main oil circuit;

[0020] The main oil circuit is connected to the oil pan via the electronic oil pump, and the main oil circuit is used to supply oil to the clutch;

[0021] The accumulator includes an elastic element and an oil storage chamber. The oil storage chamber is connected to the main oil circuit through a first interface. When the oil pressure at the first interface is greater than the oil pressure in the oil storage chamber, the oil storage chamber draws oil from the main oil circuit and compresses the elastic element. When the oil pressure in the oil storage chamber is greater than the oil pressure at the first interface, the elastic element extends and discharges the oil in the oil storage chamber.

[0022] Optionally, when the oil pressure in the main oil circuit reaches P1, the elastic element is compressed to its limit range; when the oil pressure in the main oil circuit reaches P3, the elastic element returns to its free state.

[0023] Thirdly, this disclosure provides a transmission including the high-pressure transmission system described above.

[0024] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0025] The control method for the high-pressure system of the transmission disclosed herein, by setting the value of P2, enables the electronic oil pump to start in advance before the oil pressure in the main oil circuit drops to P3, so that the electronic oil pump is in a low-speed operating state. This not only slows down the time for the oil pressure to drop to P3, but also ensures that when the oil pressure drops to P3, the speed is immediately increased to s2, so that the oil pressure in the main oil circuit begins to rise, thereby eliminating the effect of the lag in starting the electronic oil pump. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram showing the change of electronic oil pump speed and main oil circuit oil pressure over time in the high-pressure system of the gearbox described in this embodiment of the present disclosure.

[0029] Figure 2 This is a schematic diagram of the high-pressure system of the gearbox according to an embodiment of this disclosure.

[0030] Among them, 1. Electronic oil pump; 2. Accumulator; 21. Elastic element; 22. Oil reservoir; 23. First interface; 3. Oil pan; 4. Clutch. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0032] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0033] Hybrid vehicle transmissions typically require a hydraulic system to supply both high-pressure and low-pressure oil during normal operation, with the high-pressure oil primarily used for clutch control. Current hybrid systems need to maintain the main hydraulic circuit pressure within a set range to ensure that sufficient pressure is always available for clutch shifting.

[0034] The existing high-pressure system causes the oil pressure in the main oil circuit to fluctuate within a set range as the electronic oil pump operates and stops. When the oil pressure in the main oil circuit drops to the lowest point of the set range, the controller sends a start signal to the electronic oil pump, causing it to start rotating and increasing the oil pressure in the main oil circuit. However, due to the lag in the operation of the electronic oil pump, the oil pressure in the main oil circuit often falls below the lowest point of the set range. If a gear shift is performed at this time, the clutch cannot obtain sufficient oil pressure to engage, which may lead to slippage and other phenomena, thereby affecting transmission efficiency and driving experience.

[0035] Based on this, this embodiment provides a control method for a high-pressure system of a transmission, a high-pressure system for a transmission, and a transmission. By setting the value of P2, the electronic oil pump can be started in advance before the oil pressure in the main oil circuit drops to P3, so that the electronic oil pump is in a low-speed operating state. This not only slows down the time for the oil pressure to drop to P3, but also ensures that when the oil pressure drops to P3, the speed is immediately increased to s2, so that the oil pressure in the main oil circuit begins to rise, thereby eliminating the impact of the lag in the start-up of the electronic oil pump. A detailed description is provided below through specific embodiments:

[0036] Reference Figure 1 and Figure 2 As shown, the control method of a high-pressure transmission system provided in this embodiment includes the following steps: S1, vehicle start; S2, turn on the electronic oil pump 1, the speed of the electronic oil pump 1 increases from 0 to s1 during the time period t0-t1, and the speed s1 is maintained from t1 to t2; the oil pressure of the main oil circuit increases from 0 to P1 during the time period t0-t2; S3, turn off the electronic oil pump 1 at t2, the oil pressure of the main oil circuit begins to decrease, when the oil pressure of the main oil circuit decreases from P1 to P2, this is time t3, and turn on the electronic oil pump 1 at t3; S 4. At time t4, the electronic oil pump 1 reaches speed s3 and maintains speed s3 until time t5. At time t5, the main oil circuit pressure drops to P3. S5. During the time period t5-t6, the speed of the electronic oil pump 1 is increased from s3 to s2, and speed s2 is maintained from t6 to t7. At time t7, the main oil circuit pressure reaches P1. S6. Repeat steps S3 to S5. Wherein, P1 is greater than P2, P2 is greater than P3, s1 is greater than s2, and s2 is greater than s3. Specifically, the oil pressure of the main oil circuit can be monitored by the oil pressure sensor on the TCU. Figure 1 The solid line indicates the speed change of the electronic oil pump 1, and the dotted line indicates the oil pressure change of the main oil circuit.

[0037] The control method for the high-pressure system of the transmission provided in this embodiment, by setting the value of P2, enables the electronic oil pump 1 to start in advance before the oil pressure in the main oil circuit drops to P3, so that the electronic oil pump 1 is in a low-speed operating state. This not only slows down the time for the oil pressure to drop to P3, but also ensures that when the oil pressure drops to P3, the speed is immediately increased to s2, so that the oil pressure in the main oil circuit begins to rise, thereby eliminating the effect of the lag in the start-up of the electronic oil pump 1.

[0038] In some embodiments, the vehicle is in a ready state during the time period t0-t2; after t2, it is the shifting operation time; that is, shifting can be performed at any time point after t2, and it can be ensured that the clutch 4 can obtain sufficient oil pressure to achieve stable engagement of the friction plates.

[0039] In some embodiments, the value of P2 is the average of the values ​​of P1 and P3; specifically, the value of P2 can be closer to the value of P3, which can minimize the working time of the electronic oil pump 1 and thus improve the service life of the electronic oil pump 1.

[0040] Continue to refer to Figure 1 As shown, when the speed of the electronic oil pump 1 is s3, the oil pressure in the main oil circuit continues to decrease. That is to say, the electronic oil pump 1 will not affect the decreasing trend of the oil pressure in the main oil circuit during the time period t3-t5. Similarly, it will not affect the decreasing trend of the oil pressure in the main oil circuit during the same working condition time period t8-t10. When the speed of the electronic oil pump 1 is s3, it can slow down the rate of decrease of the oil pressure in the main oil circuit. At the same time, it can also ensure that when the oil pressure in the main oil circuit drops to P3, it can reach s2 in a short time, and make the oil pressure in the main oil circuit rebound immediately and show an upward trend when it drops to P3.

[0041] Specifically, in steps S3 and S4, the accumulator 2 is in the working state of supplying oil to the main oil circuit; that is, when the electronic oil pump 1 stops working (including when the speed of the electronic oil pump 1 is lower than S3), the solenoid valve begins to leak the oil pressure of the main oil circuit. At this time, the accumulator 2 mainly relies on the main oil circuit to maintain the oil pressure, thereby reducing the rate of decrease of the oil pressure in the main oil circuit. By setting this time period, the service life of the electronic oil pump 1 can be significantly improved.

[0042] In some embodiments, in steps S2 and S5, the oil pressure of the main oil circuit supplies oil to the accumulator 2.

[0043] In a further embodiment, P1 is the maximum working pressure of the accumulator 2. This setting not only protects the accumulator 2, but also ensures that the clutch 4 can obtain sufficient engagement oil pressure.

[0044] Continue to refer to Figure 1 and Figure 2 As shown, in a second aspect, this disclosure provides a high-pressure transmission system utilizing the control method described above, including an electronic oil pump 1, an accumulator 2, and a main oil circuit; the main oil circuit is connected to an oil pan 3 via the electronic oil pump 1, and is used to supply oil to the clutch 4; the accumulator 2 includes an elastic element 21 and an oil reservoir 22, the oil reservoir 22 being connected to the main oil circuit via a first interface 23; when the oil pressure at the first interface 23 is greater than the oil pressure in the oil reservoir 22, the oil reservoir 22 draws oil from the main oil circuit and compresses the elastic element 21; when the oil pressure in the oil reservoir 22 is greater than the oil pressure at the first interface 23, the elastic element 21 extends and discharges the oil from the oil reservoir 22.

[0045] In some embodiments, when the oil pressure in the main oil circuit reaches P1, the elastic element 21 is compressed to its limit range; when the oil pressure in the main oil circuit reaches P3 or is close to P3, the elastic element 21 returns to its free state.

[0046] Thirdly, this disclosure provides a transmission including the high-pressure transmission system described above.

[0047] The specific implementation method and principle are the same as those in the above embodiments, and can bring the same or similar technical effects. They will not be repeated here. For details, please refer to the description of the control method embodiment of the high-pressure system of the gearbox described above.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method of a transmission high-pressure system, characterized by, Includes the following steps: S1. Vehicle starts; S2. Start the electronic oil pump (1). During the time period t0-t1, the speed of the electronic oil pump (1) increases from 0 to s1 and maintains the speed s1 from t1 to t2. During the time period t0-t2, the oil pressure of the main oil circuit increases from 0 to P1. S3. At time t2, the electronic oil pump (1) is turned off, and the oil pressure in the main oil circuit begins to drop. When the oil pressure in the main oil circuit drops from P1 to P2, this is time t3. At time t3, the electronic oil pump (1) is turned on. S4, the electronic oil pump (1) reaches speed s3 at time t4 and maintains speed s3 until time t5. At time t5, the main oil circuit oil pressure drops to P3. S5. During the time period t5-t6, the speed of the electronic oil pump (1) is increased from s3 to s2, and the speed s2 is maintained from t6 to t7. At time t7, the oil pressure of the main oil circuit reaches P1. S6. Repeat steps S3 to S5; Among them, P1 is greater than P2, P2 is greater than P3, s1 is greater than s2, and s2 is greater than s3.

2. The control method for the high-pressure system of the gearbox according to claim 1, characterized in that, During the time period t0-t2, the vehicle is in a ready state; after time t2, there is a gear shifting operation time.

3. The control method for the high-pressure system of the gearbox according to claim 1, characterized in that, The value of P2 is the average of the values ​​of P1 and P3.

4. The control method for the high-pressure system of the gearbox according to claim 1, characterized in that, When the rotational speed of the electronic oil pump (1) is s3, the oil pressure in the main oil circuit continues to decrease.

5. The control method for the high-voltage system of the gearbox according to any one of claims 1 to 4, characterized in that, During steps S3 and S4, the accumulator (2) is in the working state of supplying oil to the main oil circuit.

6. The control method for the high-pressure system of the gearbox according to claim 5, characterized in that, In steps S2 and S5, the oil pressure of the main oil circuit supplies oil to the accumulator (2).

7. The control method for the high-pressure system of the gearbox according to claim 6, characterized in that, P1 is the maximum operating pressure of the accumulator (2).

8. A high-voltage transmission system utilizing the control method as described in any one of claims 1 to 7, characterized in that, It includes an electronic oil pump (1), an accumulator (2), and a main oil circuit; The main oil circuit is connected to the oil pan (3) through the electronic oil pump (1), and the main oil circuit is used to supply oil to the clutch (4); The accumulator (2) includes an elastic element (21) and an oil storage chamber (22). The oil storage chamber (22) is connected to the main oil circuit through a first interface (23). When the oil pressure at the first interface (23) is greater than the oil pressure in the oil storage chamber (22), the oil storage chamber (22) draws oil from the main oil circuit and compresses the elastic element (21). When the oil pressure in the oil storage chamber (22) is greater than the oil pressure at the first interface (23), the elastic element (21) extends and discharges the oil in the oil storage chamber (22).

9. The high-pressure transmission system according to claim 8, characterized in that, When the oil pressure in the main oil circuit reaches P1, the elastic element (21) is compressed to its limit.

10. A gearbox, characterized in that, Includes the high-pressure transmission system as described in claim 8 or 9.

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