Automatic flushing control method for electromagnetic valve in D-gear mode of automatic transmission

Abstract

The invention discloses an electromagnetic valve automatic flushing control method in a D-gear mode of an automatic transmission, and belongs to the technical field of transmissions. The method comprises the following steps that whether execution conditions are all met or not is confirmed, if yes, a clutch on a gear is recognized, and a corresponding electromagnetic valve is excluded; washing control is conducted on the remaining electromagnetic valves in sequence according to the washing sequence logic ring; repeatedly washing the sequential logic ring, and if a certain electromagnetic valve does not finish washing in the washing process, continuously washing by taking the electromagnetic valve as a starting point when the washing condition is met next time; and according to the calibrated washing sequence logic ring repetition period and the electromagnetic valve washing times, quitting after washing is completed. Under the D-gear steady-state gear, the non-working electromagnetic valve is scoured according to the scouring sequence logic ring, the method is closer to the actual use working condition, the situation that a certain clutch cannot be subjected to oil charging action for a long time is avoided, the problem that the electromagnetic valve is blocked due to gear shifting after long-distance and high-speed driving is avoided, and the service life of the electromagnetic valve is prolonged. And the gear shifting smoothness and the driving feeling are improved.

Description

Technical Field

[0001] The invention relates to an automatic flushing control method for a solenoid valve in a D gear mode of an automatic transmission, belonging to the technical field of transmissions. Background Art

[0002] As the number of gears in AT transmissions gradually increases, in order to ensure quick and accurate gear shifting, high-precision solenoid valves are required to respond in a timely manner and complete the establishment of the oil circuit, which is crucial to improving the efficiency and stability of the entire transmission system.

[0003] However, in actual operation, as the vehicle mileage increases, metal debris will inevitably be generated inside the gearbox, and the oil quality will gradually deteriorate. These unfavorable factors may cause the solenoid valve to perform poorly, or even cause faults such as jamming, which seriously affects the reliability and service life of the gearbox. In order to solve this problem, an effective method is urgently needed in the prior art to remove metal debris around the solenoid valve, improve the oil quality, and increase the response speed of the solenoid valve.

[0004] Currently, the most commonly used method in the market is to flush the solenoid valve in a fixed time and sequence in the P gear mode. However, due to the long-term driving of the vehicle in the D gear mode, the operating frequency and load of the shift solenoid valve are much higher than those in the P gear mode. Therefore, flushing control in the P gear alone cannot effectively solve the problem of the shift solenoid valve being stuck due to long-term driving in the D gear mode.

[0005] Therefore, there is an urgent need for a method for flushing the solenoid valve in the steady-state gear position of D gear to remove metal debris around the solenoid valve, improve oil quality, and increase the response speed of the solenoid valve, thereby ensuring the reliability and service life of the transmission. Summary of the invention

[0006] In order to solve the problems existing in the background technology, the present invention provides a method for automatically flushing a solenoid valve in a D gear mode of an automatic transmission.

[0007] To achieve the above object, the present invention adopts the following technical solution: a method for automatically flushing a solenoid valve in a D gear mode of an automatic transmission, the method comprising the following steps:

[0008] S1: confirm whether all execution conditions are met, if so, proceed to S2;

[0009] The execution conditions include:

[0010] a): No transmission failure occurs in D gear mode;

[0011] b): The transmission oil temperature is greater than the preset value;

[0012] c): The transmission is not in the process of shifting.

[0013] S2: Entering the D gear, the non-working solenoid valve flushing control is performed, and the solenoid valve corresponding to the clutch in the gear is not flushed.

[0014] S201: Identify the clutch in gear and eliminate the corresponding solenoid valve;

[0015] S202: flushing control is performed on the remaining solenoid valves in sequence according to the flushing sequence logic loop;

[0016] The flushing sequence logic loop is: clutch C1 - clutch C2 - clutch C3 - brake B1 - clutch C4 - clutch C1.

[0017] The calculation formula of the flushing current of the flushing control is as follows:

[0018] Flush current = basic current + deviation self-learning current

[0019] in:

[0020] The basic current is determined by oil pressure calibration during the test phase;

[0021] The deviation self-learning current is obtained through calculation during the vehicle operation process.

[0022] S203: Repeat the flushing sequence logic loop. If a solenoid valve fails to complete flushing during the flushing process, flushing will continue with this solenoid valve as the starting point when the flushing condition is met next time.

[0023] S204: Exit after flushing is completed according to the calibrated flushing sequence logic loop repetition cycle and the solenoid valve flushing times.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention flushes the non-working solenoid valve according to the flushing sequence logic loop in the D gear steady-state gear position, which is closer to the actual use condition, avoids a certain clutch being unable to fill oil for a long time, avoids the solenoid valve stuck when shifting after long-term driving in long-distance and high-speed driving conditions, and other problems. Compared with vehicles that do not use flushing and fixed flushing methods, the gear shift runaway phenomenon caused by insufficient oil filling is significantly reduced, and the gear shift smoothness and driving experience are improved. At the same time, the flushing current includes a deviation self-learning current. Through the correction of the deviation self-learning current, the excessive flushing current caused by the dispersion of the product causes the non-working clutch to engage and cause a torque shock, which is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the flushing sequence logic loop of the present invention;

[0027] Figure 2It is a schematic diagram of flushing current correction;

[0028] Figure 3 This is an actual test diagram of the flushing effect of the present invention. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] A method for automatically flushing a solenoid valve in an automatic transmission D gear mode, the method comprising the following steps:

[0031] S1: confirm whether all execution conditions are met, if so, proceed to S2;

[0032] The execution conditions include:

[0033] a): No transmission related faults occurred in D gear mode;

[0034] b): The transmission oil temperature is greater than the preset value;

[0035] c): The transmission is not in the process of shifting.

[0036] S2: Entering the D gear, the non-working solenoid valve flushing control is performed, and the solenoid valve corresponding to the clutch in the gear is not flushed.

[0037] S201: Identify the clutch in gear and eliminate the corresponding solenoid valve;

[0038] S202: flushing control is performed on the remaining solenoid valves in sequence according to the flushing sequence logic loop;

[0039] The flushing sequence logic loop is: clutch C1 - clutch C2 - clutch C3 - brake B1 - clutch C4 - clutch C1.

[0040] The calculation formula of the flushing current of the flushing control is as follows:

[0041] Flush current = basic current + deviation self-learning current

[0042] in:

[0043] The basic current is determined by oil pressure calibration during the test phase;

[0044] The deviation self-learning current is obtained through calculation during the vehicle operation process.

[0045] S203: Repeat the flushing sequence logic loop. If a solenoid valve fails to complete flushing due to factors such as gear shifting during the flushing process, the solenoid valve will be used as the starting point to continue flushing when the flushing conditions are met next time, so as to ensure that each solenoid valve can complete at least one flushing action in a short time to prevent the problem of stagnation or untimely response of oil filling;

[0046] S204: Exit after flushing is completed according to the calibrated flushing sequence logic loop repetition cycle and the solenoid valve flushing times.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for automatically flushing a solenoid valve in an automatic transmission D gear mode, characterized in that: The method comprises the following steps: S1: confirm whether all execution conditions are met, if so, proceed to S2; S2: Entering the D gear, the non-working solenoid valve flushing control is performed, and the solenoid valve corresponding to the clutch in the gear is not flushed.

2. The method for controlling automatic flushing of a solenoid valve in the D gear mode of an automatic transmission according to claim 1, characterized in that: The execution conditions in S1 include: a): No transmission failure occurs in D gear mode; b): The transmission oil temperature is greater than the preset value; c): The transmission is not in the process of shifting.

3. The automatic flushing control method for a solenoid valve in the D gear mode of an automatic transmission according to claim 1, characterized in that: The S2 comprises the following steps: S201: Identify the clutch in gear and eliminate the corresponding solenoid valve; S202: flushing control is performed on the remaining solenoid valves in sequence according to the flushing sequence logic loop; S203: Repeat the flushing sequence logic loop. If a solenoid valve fails to complete flushing during the flushing process, flushing will continue with this solenoid valve as the starting point when the flushing condition is met next time. S204: Exit after flushing is completed according to the calibrated flushing sequence logic loop repetition cycle and the solenoid valve flushing times.

4. The method for controlling automatic flushing of a solenoid valve in the D gear mode of an automatic transmission according to claim 3, characterized in that: The flushing sequence logic loop in S202 is: clutch C1 - clutch C2 - clutch C3 - brake B1 - clutch C4 - clutch C1.

5. The method for controlling automatic flushing of a solenoid valve in the D gear mode of an automatic transmission according to claim 3, characterized in that: The calculation formula of the flushing current of the flushing control in S202 is as follows: Flush current = basic current + deviation self-learning current Where: The basic current is determined by oil pressure calibration during the test phase; The deviation self-learning current is obtained through calculation during the vehicle operation process.

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