Hydraulic control system for oiling a clutch of an automatic transmission when the automatic transmission is parked

Abstract

The transmission hydraulic control system includes a manual valve, a default valve, and a clutch fill valve. When the manual valve is open (when the transmission is in drive or reverse), the manual valve allows fluid to flow from the pressurized line to the drive line. When the manual valve is closed (when the transmission is in neutral or park), the manual valve prevents fluid from flowing from the pressurized line to the drive line. When the manual valve is closed and the clutch fill valve is open, the clutch fill valve allows fluid to flow from the pressurized line to the drive line, thereby bypassing the manual valve. When the default valve is open, the default valve allows fluid to flow to bypass the manual valve to fill the clutches of the transmission. When the clutch fill valve is closed, the clutch fill valve prevents fluid from bypassing the manual valve.

Description

Technical Field

[0001] This disclosure relates to a hydraulic control system for injecting oil into the clutch of an automatic transmission when the automatic transmission is parked. Background Technology

[0002] The information provided in this section is for the purpose of generally introducing the background of this disclosure. To the extent described in this section, the work of the currently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither expressly nor implicitly acknowledged as prior art against this disclosure.

[0003] The hydraulic control system of an automatic transmission typically includes a manual valve and a default valve. The manual valve can be adjusted to one of several positions by regulating the position of the gear selector connected to it. When the gear selector is in neutral or park, the manual valve prevents pressurized fluid from flowing from the pressurized line to the drive or reverse gear line. When the gear selector is in drive or reverse, the manual valve allows pressurized fluid to flow from the pressurized line to the drive or reverse gear line.

[0004] The default valve regulates fluid flow from the drive gear line to the clutch supply line. Allowing pressurized fluid to flow through the clutch supply line enables actuation of the transmission clutch. Preventing pressurized fluid from flowing through the clutch supply line disables clutch actuation. Summary of the Invention

[0005] This document describes an example of a hydraulic control system for a transmission according to the present disclosure. The hydraulic control system includes a manual valve, a default valve, and a clutch injection valve. The manual valve is configured to allow fluid to flow from a pressurized line to a drive gear line when the manual valve is open, and to prevent fluid from flowing from the pressurized line to the drive gear line when the manual valve is closed. The manual valve is open when the transmission is in drive or reverse gear, and closed when the transmission is in neutral or park. The default valve is configured to allow fluid to flow from the drive gear line to at least one clutch supply line when the default valve is open, and to prevent fluid from flowing from the drive gear line to at least one clutch supply line when the default valve is closed. The clutch injection valve is configured to allow pressurized fluid to flow from the pressurized line to the drive gear line and thereby bypass the manual valve when the manual valve is closed and the clutch injection valve is open. The default valve allows pressurized fluid to flow bypassing the manual valve to at least one clutch supply line and thereby injects fluid into at least one clutch of the transmission when the default valve is open. The clutch injection valve is configured to prevent pressurized fluid from bypassing the manual valve when the clutch injection valve is closed.

[0006] In one aspect, the default valve is configured to prevent pressurized fluid bypassing the manual valve from flowing to at least one clutch supply line when the default valve is closed.

[0007] In one aspect, the hydraulic control system also includes a default solenoid configured to regulate fluid flow to a default valve and thereby actuate the default valve between its open and closed positions.

[0008] In one aspect, the hydraulic control system also includes a clutch injection solenoid configured to regulate fluid flow to the clutch injection valve and thereby actuate the clutch injection valve between its open and closed positions.

[0009] In one aspect, the manual valve has an inlet port connected to a pressurization line and an outlet port connected to a clutch lubrication activation line via a drive gear line; the default valve has a first inlet port connected to the pressurization line, a first outlet port connected to a clutch lubrication supply line, a second inlet port connected to a drive gear line, and a second outlet port connected to a first clutch supply line; and the clutch lubrication valve has an inlet port connected to the clutch lubrication supply line and an outlet port connected to the clutch lubrication activation line. When the default valve and the clutch lubrication valve are open, pressurized fluid is allowed to flow from the pressurization line to the first clutch supply line, thereby lubricating the first clutch of the transmission.

[0010] In one aspect, the clutch injection valve is configured to discharge pressurized fluid from the clutch injection activation line and the clutch injection supply line when the clutch injection valve is closed.

[0011] In one aspect, the hydraulic control system also includes a check valve that connects the clutch injection activation line to the drive gear line. The check valve is configured to prevent fluid from flowing from the clutch injection activation line to a first portion of the drive gear line extending from the outlet port of the manual valve to the check valve, and to allow fluid from the clutch injection activation line to a second portion of the drive gear line extending from the check valve to a second inlet port of the default valve.

[0012] In one aspect, when the manual valve is closed, the first part of the drive gear line is connected to the discharge port of the manual valve, so the check valve is configured to prevent fluid in the clutch lubrication activation line from being discharged through the manual valve.

[0013] In one aspect, the hydraulic control system also includes a second clutch supply line connected to a second portion of the drive gear line. When the default valve and clutch injection valve are open, pressurized fluid is allowed to flow from the pressurization line to the second clutch supply line, thereby injecting oil into the second clutch of the transmission.

[0014] In one aspect, when the default valve is open, the clutch oil supply line supplies pressurized fluid to the torque converter clutch valve, and when the default valve is closed, the pressurized fluid in the clutch oil supply line is discharged.

[0015] In one aspect, the hydraulic control system also includes a valve diagnostic module configured to determine whether the clutch injection valve is stuck and normally open based on the actuation of the torque converter clutch regulated by the torque converter clutch valve.

[0016] This document describes another example of a hydraulic control system for a transmission according to the present disclosure. The hydraulic control system includes a manual valve, a default valve, and a clutch injection valve. The manual valve has an inlet port connected to a pressurized line and an outlet port connected to a drive gear line. The default valve has a first inlet port connected to the pressurized line, a first outlet port connected to a clutch injection supply line, a second inlet port connected to a drive gear line, and a second outlet port connected to a first clutch supply line. The clutch injection valve has an inlet port connected to the clutch injection supply line and an outlet port connected to the drive gear line via a clutch injection enable line. When the manual valve is closed, the default valve is open, and the clutch injection valve is open, pressurized fluid is allowed to flow from the pressurized line to the first clutch supply line and thereby inject fluid into the first clutch of the transmission.

[0017] In one respect, when the manual valve is open, it allows fluid to flow from its inlet port to its outlet port; when the manual valve is closed, it prevents fluid from flowing from its inlet port to its outlet port. The manual valve is open when the transmission is in drive or reverse gear, and closed when the transmission is in neutral or park.

[0018] In one aspect, when the default valve is open, it allows fluid to flow from the first and second inlet ports to the first and second outlet ports, respectively, and when the default valve is closed, it prevents fluid from flowing from the first and second inlet ports to the first and second outlet ports, respectively.

[0019] In one respect, when the clutch injection valve is open, the clutch injection valve allows fluid to flow from its inlet port to its outlet port, and when the clutch injection valve is closed, the clutch injection valve prevents fluid from flowing from its inlet port to its outlet port.

[0020] In one aspect, the hydraulic control system also includes a default solenoid configured to regulate fluid flow to a default valve and thereby actuate the default valve between its open and closed positions.

[0021] In one aspect, the hydraulic control system also includes a clutch injection solenoid configured to regulate fluid flow to the clutch injection valve and thereby actuate the clutch injection valve between its open and closed positions.

[0022] In one aspect, the hydraulic control system also includes a check valve that connects the clutch injection start line to the drive gear line. The check valve prevents fluid from flowing from the clutch injection start line to a first portion of the drive gear line extending from the outlet port of the manual valve to the check valve, and allows fluid to flow from the clutch injection start line to a second portion of the drive gear line extending from the check valve to a second inlet port of the default valve.

[0023] In one aspect, when the manual valve is closed, the first part of the drive gear line is connected to the discharge port of the manual valve, thus the check valve prevents fluid in the clutch lubrication activation line from being discharged through the manual valve.

[0024] In one aspect, the hydraulic control system also includes a second clutch supply line connected to a second portion of the drive gear line. When the default valve and clutch injection valve are open, pressurized fluid is allowed to flow from the pressurization line to the second clutch supply line and thereby inject oil into the second clutch of the transmission.

[0025] This invention provides the following technical solutions:

[0026] 1. A hydraulic control system for a transmission, the hydraulic control system comprising:

[0027] The manual valve is configured to:

[0028] When the manual valve is opened, fluid is allowed to flow from the pressurized line to the drive valve line; and

[0029] When the manual valve is closed, fluid is prevented from flowing from the pressurized line to the drive gear line, wherein the manual valve is open when the transmission is in drive or reverse gear, and the manual valve is closed when the transmission is in neutral or park.

[0030] The default valve is configured as follows:

[0031] When the default valve is open, fluid is allowed to flow from the drive gear line to at least one clutch supply line; and

[0032] When the default valve is closed, fluid is prevented from flowing from the drive gear line to the at least one clutch supply line; and

[0033] The clutch injection valve is configured to:

[0034] When the manual valve is closed and the clutch lubrication valve is open, pressurized fluid is allowed to flow from the pressurized line to the drive gear line, thereby bypassing the manual valve. The default valve allows pressurized fluid to flow bypassing the manual valve to the at least one clutch supply line, thereby lubricating at least one clutch of the transmission when the default valve is open.

[0035] When the clutch injection valve is closed, pressurized fluid is prevented from bypassing the manual valve.

[0036] 2. The hydraulic control system of embodiment 1, wherein the default valve is configured to prevent pressurized fluid bypassing the manual valve from flowing to the at least one clutch supply line when the default valve is closed.

[0037] 3. The hydraulic control system as described in Scheme 1 further includes a default solenoid configured to regulate fluid flow to the default valve and thereby actuate the default valve between its open and closed positions.

[0038] 4. The hydraulic control system as described in Scheme 1 further includes a clutch injection solenoid configured to regulate fluid flow to the clutch injection valve and thereby actuate the clutch injection valve between its open and closed positions.

[0039] 5. The hydraulic control system as described in Scheme 1, wherein:

[0040] The manual valve has an inlet port connected to the pressurization line and an outlet port connected to the clutch oil injection activation line via the drive gear line.

[0041] The default valve has a first inlet port connected to the pressurization line, a first outlet port connected to the clutch oil supply line, a second inlet port connected to the drive gear line, and a second outlet port connected to the first clutch supply line; and

[0042] The clutch injection valve has an inlet port connected to the clutch injection supply line and an outlet port connected to the clutch injection activation line, wherein when the default valve and the clutch injection valve are open, pressurized fluid is allowed to flow from the pressurized line to the first clutch supply line, thereby injecting oil into the first clutch of the transmission.

[0043] 6. The hydraulic control system of embodiment 5, wherein the clutch injection valve is configured to discharge pressurized fluid from the clutch injection activation line and the clutch injection supply line when the clutch injection valve is closed.

[0044] 7. The hydraulic control system as described in embodiment 5 further includes a check valve connecting the clutch oil injection activation line to the drive gear line, wherein the check valve is configured to:

[0045] To prevent fluid from flowing from the clutch lubrication line to the first portion of the drive gear line extending from the outlet port of the manual valve to the check valve; and

[0046] This allows fluid to flow from the clutch injection enable line to the second portion of the drive gear line, which extends from the check valve to the second inlet port of the default valve.

[0047] 8. The hydraulic control system of embodiment 7, wherein when the manual valve is closed, the first portion of the drive gear line is connected to the discharge port of the manual valve, and thus the check valve is configured to prevent fluid in the clutch injection activation line from being discharged through the manual valve.

[0048] 9. The hydraulic control system of embodiment 7 further includes a second clutch supply line connected to the second portion of the drive gear line, wherein when the default valve and the clutch injection valve are open, pressurized fluid is allowed to flow from the pressurization line to the second clutch supply line, thereby injecting oil into the second clutch of the transmission.

[0049] 10. The hydraulic control system as described in Scheme 5, wherein:

[0050] When the default valve is open, the clutch oil supply line supplies pressurized fluid to the torque converter clutch valve; and

[0051] When the default valve is closed, the pressurized fluid in the clutch oil supply line is discharged.

[0052] 11. The hydraulic control system of embodiment 10 further includes a valve diagnostic module configured to determine, based on the actuation of the torque converter clutch regulated by the torque converter clutch valve, that the clutch injection valve is stuck and normally open.

[0053] 12. A hydraulic control system for a transmission, the hydraulic control system comprising:

[0054] The manual valve has an inlet port connected to the pressurization line and an outlet port connected to the drive line;

[0055] The default valve has a first inlet port connected to the pressurization line, a first outlet port connected to the clutch oil supply line, a second inlet port connected to the drive gear line, and a second outlet port connected to the first clutch supply line; and

[0056] The clutch injection valve has an inlet port connected to the clutch injection supply line and an outlet port connected to the drive gear line via a clutch injection enable line, wherein when the manual valve is closed, the default valve is open, and the clutch injection valve is open, pressurized fluid is allowed to flow from the pressurized line to the first clutch supply line and thereby inject oil into the first clutch of the transmission.

[0057] 13. The hydraulic control system as described in Scheme 12, wherein:

[0058] When the manual valve is open, the manual valve allows fluid to flow from its inlet port to its outlet port;

[0059] When the manual valve is closed, it prevents fluid from flowing from its inlet port to its outlet port;

[0060] The manual valve opens when the transmission is in drive or reverse gear; and

[0061] The manual valve is closed when the transmission is in neutral or park.

[0062] 14. The hydraulic control system as described in Scheme 12, wherein:

[0063] When the default valve is open, the default valve allows fluid to flow from the first inlet port and the second inlet port to the first outlet port and the second outlet port, respectively; and

[0064] When the default valve is closed, the default valve prevents fluid from flowing from the first inlet port and the second inlet port to the first outlet port and the second outlet port, respectively.

[0065] 15. The hydraulic control system as described in Scheme 12, wherein:

[0066] When the clutch injection valve is open, the clutch injection valve allows fluid to flow from its inlet port to its outlet port; and

[0067] When the clutch injection valve is closed, the clutch injection valve prevents fluid from flowing from its inlet port to its outlet port.

[0068] 16. The hydraulic control system of embodiment 12 further includes a default solenoid configured to regulate fluid flow to the default valve and thereby actuate the default valve between its open and closed positions.

[0069] 17. The hydraulic control system of embodiment 12 further includes a clutch injection solenoid configured to regulate fluid flow to the clutch injection valve and thereby actuate the clutch injection valve between its open and closed positions.

[0070] 18. The hydraulic control system of claim 12 further includes a check valve connecting the clutch oil injection activation line to the drive gear line, wherein the check valve:

[0071] To prevent fluid from flowing from the clutch lubrication line to the first portion of the drive gear line extending from the outlet port of the manual valve to the check valve; and

[0072] This allows fluid to flow from the clutch injection enable line to the second portion of the drive gear line, which extends from the check valve to the second inlet port of the default valve.

[0073] 19. The hydraulic control system of embodiment 18, wherein when the manual valve is closed, the first portion of the drive gear line is connected to the discharge port of the manual valve, so that the check valve prevents fluid in the clutch injection activation line from being discharged through the manual valve.

[0074] 20. The hydraulic control system of embodiment 18 further includes a second clutch supply line connected to the second portion of the drive line, wherein when the default valve and the clutch injection valve are open, pressurized fluid is allowed to flow from the pressurized line to the second clutch supply line and thereby inject oil into the second clutch of the transmission.

[0075] Other areas of application of this disclosure will become apparent from the detailed description, claims, and drawings. The detailed description and specific examples are for illustrative purposes only and are not intended to limit the scope of this disclosure. Attached Figure Description

[0076] This disclosure will be more fully understood through detailed description and accompanying drawings, in which:

[0077] Figure 1 This is a schematic diagram of an example of a hydraulic control system according to the present disclosure, which includes a default valve and a clutch injection valve, shown in their respective closed positions;

[0078] Figure 2 yes Figure 1 A schematic diagram of the hydraulic control system, in which the default valve and clutch injection valve are shown in their respective open positions;

[0079] Figure 3 yes Figure 1 A schematic diagram of the hydraulic control system, wherein the default valve is shown in its closed position and the clutch injection valve is shown in its open position; and

[0080] Figure 4 yes Figure 1 A schematic diagram of the hydraulic control system, in which the default valve is shown in its open position and the clutch injection valve is shown in its closed position.

[0081] In the accompanying drawings, reference numerals may be used repeatedly to identify similar and / or identical elements. Detailed Implementation

[0082] When the automatic transmission's gear selector is in neutral or park, the hydraulic control system for the automatic transmission normally prevents pressurized hydraulic fluid from flowing to any drive or reverse clutches. This function ensures that the transmission does not accidentally shift into drive or reverse. However, when the gear selector initially shifts into drive or reverse, this function can increase the time variation in filling the drive or reverse clutch, which may degrade the customer experience and increase warranty claims.

[0083] The hydraulic control system according to this disclosure addresses these problems by lubricating the drive and reverse clutches when the gear selector is in neutral or park (such as before the first shift of the day). The hydraulic control system lubricates the drive and reverse clutches by filling them with hydraulic fluid and purging air. In one example, the hydraulic control system includes a clutch lubrication valve and a solenoid that actuates the clutch lubrication valve to temporarily allow actuation of the drive and reverse clutches. In another example, the hydraulic control system includes hardware components such as a unique default valve, a clutch lubrication valve, and a valve diagnostic module, which ensure that the drive and reverse clutches are only lubricated when lubrication is required. The valve diagnostic module diagnoses when the clutch lubrication valve is stuck in a position.

[0084] Now for reference Figure 1 and Figure 2 The diagram illustrates a hydraulic control system 10 for an automatic transmission. The hydraulic control system 10 includes a manual valve 12, a default valve 14, a boost valve 16, a clutch filler valve 18, a default solenoid 20, a clutch filler solenoid 22, and a check valve 24. The manual valve 12 is adjustable to multiple positions by moving or manipulating a gear selector 26. In the illustrated example, a mechanical linkage 28 connects the manual valve 12 to the gear selector 26. In other examples, the position of the gear selector 26 may be measured using a sensor (not shown), and a valve control module 30 may control the solenoid to adjust the position of the manual valve 12 based on the gear selector position. The valve control module 30 may be part of the hydraulic control system 10.

[0085] The manual valve 12 has a first inlet port 32, a second inlet port 34, a first outlet port 36, a second outlet port 38, a third outlet port 40, and a discharge port 42. The first inlet port 32 is connected to a pressurization line 44 containing pressurized fluid. The second inlet port 34 is connected to a drive line 46. The first outlet port 36 is connected to the pressurization line 44. The second outlet port 38 is connected to the drive line 46. The third outlet port 40 is connected to a reverse line 48. The discharge port 42 is connected to a discharge line (not shown).

[0086] When the gear selector 26 and the transmission are in neutral, the manual valve 12 is in position. Figure 1The manual valve 12 is in the first position shown, and in the second position when the gear selector 26 and the transmission are in park. In either the first or second position, the manual valve 12 prevents fluid from flowing from the pressurized line 44 to the drive gear line 46. Therefore, each of the first and second positions of the manual valve 12 can be referred to as the closed position. In either the first or second position, the manual valve 12 allows fluid to flow from the drive gear line 46 and the reverse gear line 48 to the discharge line.

[0087] When the gear selector 26 and the transmission are in drive, the manual valve 12 is in the third position, and when the gear selector 26 and the transmission are in reverse, the manual valve 12 is in the fourth position. In the third position, the manual valve 12 allows fluid to flow from the pressurized line 44 to the drive line 46. In the fourth position, the manual valve 12 allows fluid to flow from the pressurized line 44 to the reverse line 48. Therefore, each of the third and fourth positions of the manual valve 12 can be referred to as the open position. In the third position, the manual valve 12 prevents fluid from flowing from the drive line 46 to the discharge line, and the manual valve 12 allows fluid to flow from the reverse line 48 to the discharge line. In the fourth position, the manual valve 12 allows fluid to flow from the drive line 46 to the discharge line, and the manual valve 12 prevents fluid from flowing from the reverse line 48 to the discharge line.

[0088] As used herein, the terms "first position," "second position," "third position," and "fourth position" do not indicate the shift sequence of the transmission. Rather, the terms "first position," "second position," "third position," and "fourth position" simply indicate the order in which these positions are described herein. For example, the discussion above indicates that when the gear selector 26 and the manual valve 12 are in neutral, park, drive, and reverse, respectively, the manual valve 12 is in the first, second, third, and fourth positions. However, the shift sequence of the transmission could be park (first), reverse (second), neutral (third), drive (fourth), and low gear (fourth).

[0089] The default valve 14 has a first inlet port 50, a second inlet port 52, a third inlet port 51, a fourth inlet port 53, a first outlet port 54, a second outlet port 56, and a third outlet port 57. The first inlet port 50 is connected to a pressurization line 44. The second inlet port 52 is connected to a drive gear line 46. The third inlet port 51 is directly connected to a reverse gear line 48. The fourth inlet port 53 is connected to the reverse gear line 48 via a check valve 59. The first outlet port 54 is connected to a clutch fluid supply line 58. The second outlet port 56 is connected to a first clutch supply line 60, which supplies pressurized fluid to the first clutch of the transmission to engage the first clutch. The third outlet port 57 is connected to the reverse clutch supply line 61.

[0090] The default solenoid 20 regulates the flow of hydraulic fluid (e.g., oil) to the default valve 14 via the default valve control line 62, in order to... Figure 1 The first position shown and Figure 2 The default valve 14 is actuated between the second positions shown. The default solenoid 20 regulates the default valve 14 between its first and second positions in response to a default valve control signal from the valve control module 30. In its first position, the default valve 14 prevents fluid from flowing from the pressurization line 44 to the clutch oil supply line 58 and prevents fluid from flowing from the drive gear line 46 to the first clutch supply line 60. Therefore, the first position of the default valve 14 can be referred to as its closed position. In its second position, the default valve 14 allows fluid to flow from the pressurization line 44 to the clutch oil supply line 58 and allows fluid to flow from the drive gear line 46 to the first clutch supply line 60. Therefore, the second position of the default valve 14 can be referred to as its open position.

[0091] When manual valve 12 is in the fourth position, the fluid in reverse line 48 forces default valve 14 to its closed position, such as... Figure 1 As shown. The fluid in the reverse gear line 48 then flows through the third inlet port 51 of the default valve 14, through the second outlet port 56 of the default valve 14, and into the first clutch supply line 60. Furthermore, the fluid in the reverse gear line 48 flows through the check valve 59, through the fourth inlet port 53 of the default valve 14, through the third outlet port 57 of the default valve 14, and into the reverse clutch supply line 61.

[0092] The clutch injection valve 18 has an inlet port 64, an outlet port 66, and a discharge port 67. The inlet port 64 is connected to the clutch injection supply line 58. The outlet port 66 is connected to the clutch injection activation line 68. The discharge port 67 is connected to the discharge line.

[0093] The clutch oil injection solenoid 22 regulates the flow of hydraulic fluid to the clutch oil injection valve 18 via the clutch oil injection valve control line 70, so as to... Figure 1 The first position shown and Figure 2 The clutch injection valve 18 is actuated between the second positions shown. The clutch injection solenoid 22 regulates the clutch injection valve 18 between its first and second positions in response to a clutch injection valve control signal from the valve control module 30. The clutch injection solenoid 22 also regulates the position of the booster valve 16 by adjusting the flow of hydraulic fluid through the clutch injection valve control line 70. In this respect, the clutch injection solenoid 22 may be referred to as a booster solenoid. Using a single solenoid to control two valves reduces the cost and complexity of the hydraulic control system 10.

[0094] In its first position, the clutch filler valve 18 prevents fluid from flowing from the clutch filler supply line 58 to the clutch filler activation line 68. Furthermore, the clutch filler valve 18 allows fluid to flow from both the clutch filler supply line 58 and the clutch filler activation line 68 to the discharge line. In its second position, the clutch filler valve 18 allows fluid to flow from the clutch filler supply line 58 to the clutch filler activation line 68. Furthermore, the clutch filler valve 18 prevents fluid from flowing from both the clutch filler supply line 58 and the clutch filler activation line 68 to the discharge line.

[0095] Check valve 24 connects the clutch lubrication activation line 68 to the drive gear line 46. Check valve 24 prevents fluid from flowing from the clutch lubrication activation line 68 to the first portion 72 of the drive gear line 46, which extends from the second outlet port 38 of the manual valve 12 to the check valve 24. Check valve 24 allows fluid to flow from the clutch lubrication activation line 68 to the second portion 74 of the drive gear line 46, which extends from the check valve 24 to the second inlet port 52 of the default valve 14. The second portion 74 of the drive gear line 46 connects to the second clutch supply line 76, which supplies pressurized fluid to the second clutch of the transmission to enable engagement of the second clutch.

[0096] The transmission may include one or more (e.g., two) clutches in addition to the first and second clutches. These other clutches may receive pressurized fluid directly from pressurized line 44 and thus can be engaged regardless of whether gear selector 26 is in neutral or park. However, shifting the transmission to drive or reverse may require engaging other clutches as well as at least one of the first and second clutches.

[0097] The valve control module 30 outputs a default valve control signal and a clutch injection valve control signal to the default solenoid 20 and the clutch injection solenoid 22, respectively, to adjust the positions of the default valve 14 and the clutch injection valve 18. The valve control module 30 can adjust the positions of the default valve 14 and the clutch injection valve 18 based on the gear selector position. For example, when the gear selector 26 is in neutral or park, the valve control module 30 can typically adjust the default valve 14 and the clutch injection valve 18 to their respective first positions. However, when the gear selector 26 is in neutral or park, the valve control module 30 can periodically adjust the default valve 14 and the clutch injection valve 18 to their respective second positions to inject oil into the transmission clutch, as described below.

[0098] exist Figure 1 and Figure 2 In this position, the gear selector 26 and the transmission are in neutral, therefore the manual valve 12 is in its first position. Furthermore, in... Figure 1In this configuration, the default solenoid 20 and clutch lubrication solenoid 22 are closed, thus the default valve 14 and clutch lubrication valve 18 are in their respective first positions. When the manual valve 12 is in its first position, fluid in the first portion 72 of the drive line 46 is discharged through the manual valve 12. Therefore, pressurized fluid cannot flow from the first portion 72 of the drive line 46 to the first and second clutch supply lines 60 and 76, and thus the first and second clutches of the transmission cannot engage.

[0099] exist Figure 2 In this configuration, the default solenoid 20 and clutch injection solenoid 22 are open, thus the default valve 14 and clutch injection valve 18 are in their respective second positions. Pressurized fluid then flows from the pressurized line 44 through the default valve 14 to the clutch injection supply line 58, and from the clutch injection supply line 58 to the clutch injection activation line 68 via the clutch injection valve 18. Furthermore, pressurized fluid flows from the clutch injection activation line 68 to the second section 74 of the drive gear line 46 via the check valve 24, and from the second section 74 of the drive gear line 46 to the first clutch supply line 60 via the default valve 14. Therefore, when the manual valve 12 is closed and the clutch injection valve 18 is open, the clutch injection valve 18 allows pressurized fluid to flow from the pressurized line 44 to the drive gear line 46, thus bypassing the manual valve 12. Furthermore, pressurized fluid flows from the second portion 74 of the drive gear line 46 to the second clutch supply line 76, and check valve 24 prevents pressurized fluid in the clutch lubrication activation line 68 from being discharged through manual valve 12. Therefore, default valve 14 allows pressurized fluid bypassing manual valve 12 to flow to the first and second clutch supply lines 60 and 76, thereby lubricating the first and second clutches of the transmission when default valve 14 is open.

[0100] In addition to providing a means of energizing the first and second clutches by bypassing the manual valve 12 when the transmission is in neutral or park, the hydraulic control system 10 also includes three hardware components that prevent engagement of the first or second clutch when the transmission is in neutral or park. These hardware components include a default valve 14, a clutch energizing valve 18, and a valve control module 30. If any of these hardware components malfunctions, at least one of the other two components will prevent engagement of the first or second clutch when the transmission is in neutral or park.

[0101] Now for reference Figure 3 and Figure 4 This illustrates two possible hardware failure modes of the hydraulic control system 10. Figure 3In this configuration, the clutch injection solenoid 22 is commanded to close, adjusting the clutch injection valve 18 to its first position. However, the clutch injection valve 18 is stuck in its second position. Nevertheless, the default solenoid 20 is commanded to close, thus the default valve 14 is in its first position. Subsequently, the default valve 14 prevents fluid from flowing from the pressurization line 44 to the clutch injection activation line 68. Furthermore, fluid in the clutch injection supply line 58 is drained through the default valve 14 to the discharge line 78. Therefore, even though the clutch injection valve 18 is stuck in its second position, pressurized fluid cannot bypass the manual valve 12 to flow to the first or second clutch supply lines 60 or 76 to enable the first or second clutch of the transmission to engage.

[0102] exist Figure 4 In this configuration, the default solenoid 20 is commanded to close, adjusting the default valve 14 to its first position. However, the default valve 14 is locked in its second position, allowing fluid to flow from the pressurization line 44 to the clutch injection supply line 58. Nevertheless, the clutch injection solenoid 22 is commanded to close, thus the clutch injection valve 18 is in its first position. The clutch injection valve 18 then prevents pressurized fluid from bypassing the manual valve 12 by preventing fluid from flowing from the clutch injection supply line 58 to the clutch injection activation line 68. Furthermore, fluid in the clutch injection activation line 68 is discharged through the clutch injection valve 18. Therefore, even though the default valve 14 is locked in its second position, pressurized fluid cannot flow to the first or second clutch supply lines 60 or 76 to engage the first or second clutch of the transmission.

[0103] In various implementations, the valve control module 30 diagnoses when the default valve 14 or clutch injection valve 18 is stuck in its first position based on inputs from the engine speed sensor 80 and the turbine speed sensor 82. In this respect, the valve control module 30 may be referred to as a valve diagnostic module. The engine speed sensor 80 measures the speed of the engine coupled to the transmission. The turbine speed sensor 82 measures the speed of the turbine in the torque converter that couples the engine to the transmission.

[0104] In one example, the clutch injection supply line 58 supplies hydraulic fluid to the regulating valve of the clutch used by the torque converter. Therefore, the valve control module 30 can diagnose whether the clutch injection valve 18 is stuck and normally open based on the actuation of the torque converter clutch. The valve control module 30 can evaluate the actuation of the torque converter clutch based on engine speed and turbine speed. For example, when the turbine speed is less than the engine speed and the transmission is in neutral or park, the valve control module 30 can determine that the torque converter clutch is stuck in the engaged position.

[0105] The foregoing description is illustrative in nature and is in no way intended to limit this disclosure, its application, or use. The broad teachings of this disclosure can be implemented in various forms. Therefore, although this disclosure includes specific examples, its true scope should not be so limited, as other modifications will become apparent upon examination of the drawings, specification, and appended claims. It should be understood that one or more steps within the method can be performed in a different order (or simultaneously) without altering the principles of this disclosure. Furthermore, although each embodiment has been described above as having certain features, any one or more of those features described with respect to any embodiment of this disclosure can be implemented in any other embodiment and / or combined with features of any other embodiment, even if such combination is not explicitly described. In other words, the described embodiments are not mutually exclusive, and substitution of one or more embodiments for each other remains within the scope of this disclosure.

[0106] Various terms, including “connection,” “joint,” “link,” “adjacent,” “next to,” “on top of,” “above,” “below,” and “set,” are used to describe spatial and functional relationships between elements (e.g., between modules, circuit elements, semiconductor layers, etc.). Unless explicitly described as “direct,” the relationship between the first and second elements described in the above disclosure can be a direct relationship where no other intermediate elements exist between the first and second elements, but it can also be an indirect relationship where one or more intermediate elements (spatially or functionally) exist between the first and second elements. As used herein, at least one of the phrases A, B, and C should be interpreted as indicating a logic using the non-exclusive logic “OR” (A or B or C) and should not be interpreted as indicating “at least one of A, at least one of B, and at least one of C.”

[0107] In the accompanying drawings, the direction in which the arrows point (as indicated by the arrows) typically indicates the flow of information (such as data or instructions) of interest to the illustration. For example, when components A and B exchange various types of information, but the information sent from component A to component B is relevant to the illustration, the arrow may point from component A to component B. This unidirectional arrow does not imply that no other information is being sent from component B to component A. Furthermore, for information sent from component A to component B, component B may send a request for that information or an acknowledgment of receipt of that information to component A.

[0108] In this application, which includes the following definitions, the term "module" or "controller" may be replaced by the term "circuit". The term "module" may refer to, be part of, or include the following: application-specific integrated circuit (ASIC); digital, analog, or mixed analog / digital discrete circuit; digital, analog, or mixed analog / digital integrated circuit; combinational logic circuit; field-programmable gate array (FPGA); processor circuitry (shared, dedicated, or grouped) for executing code; memory circuitry (shared, dedicated, or grouped) for storing code executed by the processor circuitry; other suitable hardware components that provide the aforementioned functionality; or some or all of the above combinations, such as in a system-on-a-chip.

[0109] A module may include one or more interface circuits. In some examples, the interface circuit may include a wired or wireless interface connected to a local area network (LAN), the Internet, a wide area network (WAN), or a combination thereof. The functionality of any given module disclosed herein may be distributed across multiple modules connected via the interface circuit. For example, multiple modules may allow for load balancing. In another example, a server (also known as a remote or cloud) module may perform certain functions on behalf of a client module.

[0110] The term "code" as used above can include software, firmware, and / or microcode, and can refer to programs, routines, functions, classes, data structures, and / or objects. The term "shared processor circuitry" includes a single processor circuit that executes some or all of the code from multiple modules. The term "group processor circuitry" includes a processor circuit that, in combination with other processor circuits, executes some or all of the code from one or more modules. References to multiple processor circuits include multiple processor circuits on a discrete die, multiple processor circuits on a single die, multiple cores of a single processor circuit, multiple threads of a single processor circuit, or a combination of the above. The term "shared memory circuitry" includes a single memory circuit that stores some or all of the code from multiple modules. The term "group memory circuitry" includes a memory circuit that, in combination with other memories, stores some or all of the code from one or more modules.

[0111] The term "memory circuit" is a subset of the term "computer-readable medium." As used herein, the term "computer-readable medium" does not include transient electrical or electromagnetic signals propagating through a medium (such as on a carrier wave); therefore, the term "computer-readable medium" can be considered tangible and non-transitory. Non-limiting examples of non-transitory tangible computer-readable media include non-volatile memory circuits (such as flash memory circuits, erasable programmable read-only memory circuits, or masked read-only memory circuits), volatile memory circuits (such as static random access memory circuits or dynamic random access memory circuits), magnetic storage media (such as analog or digital magnetic tape or hard disk drives), and optical storage media (such as CDs, DVDs, or Blu-ray discs).

[0112] The apparatus and methods described in this application can be partially or fully implemented by a special-purpose computer created by configuring a general-purpose computer to perform one or more specific functions implemented in a computer program. The function blocks, flowchart components, and other elements described above serve as software specifications that can be converted into computer programs through the daily work of technicians or programmers.

[0113] A computer program includes processor-executable instructions stored on at least one non-transitory tangible computer-readable medium. The computer program may also contain or depend on stored data. The computer program may include a basic input / output system (BIOS) for interacting with the hardware of a special-purpose computer, device drivers for interacting with specific devices of the special-purpose computer, one or more operating systems, user applications, background services, background applications, etc.

[0114] These computer programs may include: (i) descriptive text to be parsed, such as HTML (Hypertext Markup Language), XML (Extensible Markup Language), or JSON (JavaScript Object Notation); (ii) assembly code; (iii) object code generated from source code by a compiler; (iv) source code executed by an interpreter; (v) source code compiled and executed by a just-in-time compiler; and so on. As an example only, source code may be written using the syntax of languages ​​including: C, C++, C#, Objective-C, Swift, Haskell, Go, SQL, R, Lisp, Java®, Fortran, Perl, Pascal, Curl, OCaml, JavaScript®, HTML5 (Hypertext Markup Language version 5), Ada, ASP (Active Server Pages), PHP (PHP: Hypertext Preprocessor), Scala, Eiffel, Smalltalk, Erlang, Ruby, Flash®, Visual Basic®, Lua, MATLAB, SIMULINK, and Python®.

Claims

1. A hydraulic control system for a transmission, the hydraulic control system comprising: The manual valve is configured to: When the manual valve is opened, fluid is allowed to flow from the pressurized line to the drive valve line; as well as When the manual valve is closed, fluid is prevented from flowing from the pressurized line to the drive gear line, wherein the manual valve is open when the transmission is in drive or reverse gear, and the manual valve is closed when the transmission is in neutral or park. The default valve is configured as follows: When the default valve is open, fluid is allowed to flow from the drive gear line to at least one clutch supply line; as well as When the default valve is closed, fluid is prevented from flowing from the drive gear line to the at least one clutch supply line; and The clutch injection valve is configured to: When the manual valve is closed and the clutch lubrication valve is open, pressurized fluid is allowed to flow from the pressurized line to the drive gear line, thereby bypassing the manual valve, wherein the default valve allows pressurized fluid to flow to the at least one clutch supply line, thereby lubricating at least one clutch of the transmission when the default valve is open; as well as When the clutch oil injection valve is closed, it prevents pressurized fluid from bypassing the manual valve. in: The manual valve has an inlet port connected to the pressurization line and an outlet port connected to the clutch oil injection activation line via the drive gear line. The default valve has a first inlet port connected to the pressurization line, a first outlet port connected to the clutch oil supply line, a second inlet port connected to the drive gear line, and a second outlet port connected to the first clutch supply line. as well as The clutch injection valve has an inlet port connected to the clutch injection supply line and an outlet port connected to the clutch injection activation line, wherein when the default valve and the clutch injection valve are open, pressurized fluid is allowed to flow from the pressurized line to the first clutch supply line, thereby injecting oil into the first clutch of the transmission.

2. The hydraulic control system of claim 1, wherein the default valve is configured to prevent pressurized fluid bypassing the manual valve from flowing to the at least one clutch supply line when the default valve is closed.

3. The hydraulic control system of claim 1 further includes a default solenoid configured to regulate fluid flow to the default valve and thereby actuate the default valve between its open and closed positions.

4. The hydraulic control system of claim 1 further includes a clutch injection solenoid configured to regulate fluid flow to the clutch injection valve and thereby actuate the clutch injection valve between its open and closed positions.

5. The hydraulic control system of claim 1, wherein the clutch injection valve is configured to discharge pressurized fluid from the clutch injection activation line and the clutch injection supply line when the clutch injection valve is closed.

6. The hydraulic control system of claim 1, further comprising a check valve connecting the clutch oil injection activation line to the drive gear line, wherein the check valve is configured to: To prevent fluid from flowing from the clutch lubrication line to the first portion of the drive gear line extending from the outlet port of the manual valve to the check valve; and This allows fluid to flow from the clutch injection enable line to the second portion of the drive gear line, which extends from the check valve to the second inlet port of the default valve.

7. The hydraulic control system of claim 6, wherein when the manual valve is closed, the first portion of the drive gear line is connected to the discharge port of the manual valve, and thus the check valve is configured to prevent fluid in the clutch injection activation line from being discharged through the manual valve.

8. The hydraulic control system of claim 6, further comprising a second clutch supply line connected to the second portion of the drive gear line, wherein when the default valve and the clutch injection valve are open, pressurized fluid is allowed to flow from the pressurization line to the second clutch supply line, thereby injecting oil into the second clutch of the transmission.

9. The hydraulic control system as described in claim 1, wherein: When the default valve is open, the clutch oil supply line supplies pressurized fluid to the torque converter clutch valve; and When the default valve is closed, the pressurized fluid in the clutch oil supply line is discharged.

10. The hydraulic control system of claim 9, further comprising a valve diagnostic module configured to determine, based on the actuation of the torque converter clutch regulated by the torque converter clutch valve, that the clutch injection valve is stuck and normally open.

11. A hydraulic control system for a transmission, the hydraulic control system comprising: The manual valve has an inlet port connected to the pressurization line and an outlet port connected to the drive line; The default valve has a first inlet port connected to the pressurization line, a first outlet port connected to the clutch oil supply line, a second inlet port connected to the drive gear line, and a second outlet port connected to the first clutch supply line. as well as The clutch injection valve has an inlet port connected to the clutch injection supply line and an outlet port connected to the drive gear line via a clutch injection enable line, wherein when the manual valve is closed, the default valve is open, and the clutch injection valve is open, pressurized fluid is allowed to flow from the pressurized line to the first clutch supply line and thereby inject oil into the first clutch of the transmission.

12. The hydraulic control system as claimed in claim 11, wherein: When the manual valve is open, the manual valve allows fluid to flow from its inlet port to its outlet port; When the manual valve is closed, it prevents fluid from flowing from its inlet port to its outlet port; The manual valve opens when the transmission is in drive or reverse gear; as well as The manual valve is closed when the transmission is in neutral or park.

13. The hydraulic control system as claimed in claim 11, wherein: When the default valve is open, the default valve allows fluid to flow from the first inlet port and the second inlet port to the first outlet port and the second outlet port, respectively. as well as When the default valve is closed, the default valve prevents fluid from flowing from the first inlet port and the second inlet port to the first outlet port and the second outlet port, respectively.

14. The hydraulic control system as claimed in claim 11, wherein: When the clutch injection valve is open, the clutch injection valve allows fluid to flow from its inlet port to its outlet port; and When the clutch injection valve is closed, the clutch injection valve prevents fluid from flowing from its inlet port to its outlet port.

15. The hydraulic control system of claim 11, further comprising a default solenoid configured to regulate fluid flow to the default valve and thereby actuate the default valve between its open and closed positions.

16. The hydraulic control system of claim 11, further comprising a clutch injection solenoid configured to regulate fluid flow to the clutch injection valve and thereby actuate the clutch injection valve between its open and closed positions.

17. The hydraulic control system of claim 11, further comprising a check valve connecting the clutch oil injection activation line to the drive gear line, wherein the check valve: To prevent fluid from flowing from the clutch lubrication line to the first portion of the drive gear line extending from the outlet port of the manual valve to the check valve; and This allows fluid to flow from the clutch injection enable line to the second portion of the drive gear line, which extends from the check valve to the second inlet port of the default valve.

18. The hydraulic control system of claim 17, wherein when the manual valve is closed, the first portion of the drive gear line is connected to the discharge port of the manual valve, so that the check valve prevents fluid in the clutch injection activation line from being discharged through the manual valve.

19. The hydraulic control system of claim 17, further comprising a second clutch supply line connected to the second portion of the drive gear line, wherein when the default valve and the clutch injection valve are open, pressurized fluid is allowed to flow from the pressurized line to the second clutch supply line and thereby inject oil into the second clutch of the transmission.

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