Systems and methods for protecting a selectable one-way clutch of a transmission from high slip-speed engagements

Patent metadata

Field	Value
Publication number	US-12104664-B2
Application number	US-202318176735-A
Country	US
Kind code	B2
Filing date	Mar 1, 2023
Priority date	Mar 1, 2023
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

Systems and methods are provided for controlling a transmission of a vehicle that has a selectable one-way clutch. The system includes a sensor system, an anti-lock brake system (ABS), and a controller configured to, by a processor: monitor for a deceleration event wherein an estimated output speed acceleration of the vehicle is reduced below a first threshold, receive a status of the ABS, and output one or more control signals to command the transmission to inhibit the application of the selectable one-way clutch in response to detection of the deceleration event when the selectable one-way clutch is not applied, and the estimated output speed acceleration of the vehicle is either: (i) below the first threshold while the anti-lock brake system ABS of the vehicle is active, or (ii) below a second threshold while the ABS is inactive, wherein the first threshold is greater than the second threshold.

First claim

What is claimed is:

1. A system for controlling a transmission of a vehicle that has a selectable one-way clutch, the system comprising:
a sensor system comprising one or more sensors configured to sense an observable condition of the vehicle;
an anti-lock brake system (ABS); and
a controller configured to, by a processor:
monitor for a deceleration event wherein an estimated output speed acceleration of the vehicle, determined based on the observable condition sensed by the sensor system, is reduced below a first threshold;
receive a status of the anti-lock brake system (ABS) of the vehicle indicating whether the anti-lock brake system (ABS) is active or inactive; and
output one or more control signals to command the transmission to inhibit application of the selectable one-way clutch in response to detection of the deceleration event when the selectable one-way clutch is not applied, and the estimated output speed acceleration of the vehicle is either: (i) below the first threshold while the anti-lock brake system (ABS) of the vehicle is active, or (ii) below a second threshold while the anti-lock brake system (ABS) is inactive, wherein the first threshold is greater than the second threshold.

2. The system of claim 1 , wherein the controller is configured to, by the processor:
calculate the estimated output speed acceleration of the vehicle based on the observable condition sensed by the sensor system;
receive sensed wheel speed for wheels of the vehicle; and
receive dynamic vehicle test (DVT) information.

3. The system of claim 1 , wherein the one or more of control signals are configured to:
reduce a hydraulic pressure of a hydraulic circuit of the vehicle such that the selectable one-way clutch is transitioned to a release position wherein a strut of the selectable one-way clutch is not engaged; and
disable a capability of changing the hydraulic pressure after the hydraulic pressure is reduced.

4. The system of claim 1 , wherein the controller is configured to, by the processor:
change a gear state of the transmission by setting or overriding a commanded gear state of the transmission to neutral with no clutches applied when a range selection device configured to select an operating range of the transmission is set to neutral and a scheduled gear state of the transmission is neutral with the selectable one-way clutch engaged or applied; or
change the gear state by setting or overriding the commanded gear state of the transmission to first gear freewheel when the range selection device is set to drive and the scheduled gear state of the transmission is first gear locked.

5. The system of claim 1 , wherein the controller is configured to, by the processor, output one or more additional control signals to command the transmission to provide engine braking by changing a gear state of the transmission in response to outputting the one or more control signals.

6. The system of claim 5 , wherein the transmission includes a Manual mode configured to allow an operator to manually change the gear state of the transmission, wherein the controller is configured to, by the processor, change the gear state by setting or overriding a commanded gear state of the transmission to second gear when the Manual mode is active, a gear range of the transmission is first gear manual (M 1 ), a scheduled gear state of the transmission is first gear freewheel, and an attained gear state of the transmission is less than or equal to second gear.

7. The system of claim 6 , wherein after setting or overriding the commanded gear state of the transmission to second gear, the controller is configured to, by the processor, execute a change-of-mind or return-to-previous-range command to command the transmission to second gear when the commanded gear state is first gear freewheel.

8. The system of claim 6 , wherein setting or overriding the commanded gear state of the transmission to second gear, the controller is configured to, by the processor, to end the setting or overriding of the commanded gear state of the transmission to second gear when the attained gear state of the transmission is greater than second gear, the Manual mode is active, and the gear range of the Manual mode is greater than second gear manual (M 2 ).

9. The system of claim 1 , wherein the controller is configured to, by the processor:
initiate an overall event timer in response to automatically inhibiting the application of the selectable one-way clutch;
initiate a hysteresis timer if the estimated output speed acceleration is greater than a third threshold;
monitor for a selection of a gear range of reverse and a commanded gear state of reverse; and
output one or more additional control signals to command the transmission to cease inhibition of the application of the selectable one-way clutch in response to the overall event timer being greater than or equal to an overall event timeout threshold, the hysteresis timer being greater than or equal to a hysteresis timeout threshold, or the detection of the selection of the gear range of reverse and the commanded gear state of reverse.

10. A method for a vehicle having a transmission with a selectable one-way clutch, the method comprising:
receiving an observable condition of the vehicle sensed by a sensor system;
receiving a status of an anti-lock brake system (ABS) of the vehicle indicating whether the anti-lock brake system (ABS) is active or inactive;
monitoring, by a processor, for a deceleration event wherein an estimated output speed acceleration of the vehicle, determined based on the observable condition sensed by the sensor system, is reduced below a first threshold; and
outputting, by the processor, one or more control signals to command the transmission to inhibit application of the selectable one-way clutch in response to detection of the deceleration event when the selectable one-way clutch is not applied, and the estimated output speed acceleration of the vehicle is either: (i) below the first threshold while the anti-lock brake system (ABS) of the vehicle is active, or (ii) below a second threshold while the anti-lock brake system (ABS) is inactive, wherein the first threshold is greater than the second threshold.

11. The method of claim 10 , wherein monitoring for the deceleration event includes:
calculating, by the processor, the estimated output speed acceleration of the vehicle based on the observable condition sensed by the sensor system;
receiving, by the processor, sensed wheel speed for wheels of the vehicle; and
receiving, by the processor, dynamic vehicle test (DVT) information.

12. The method of claim 10 , wherein the one or more of control signals are configured to:
reduce a hydraulic pressure of a hydraulic circuit of the vehicle such that the selectable one-way clutch is transitioned to a release position wherein a strut of the selectable one-way clutch is not engaged; and
disable a capability of changing the hydraulic pressure after the hydraulic pressure is reduced.

13. The method of claim 10 , further comprising:
setting or overriding, by the processor, a commanded gear state of the transmission to neutral with no clutches applied when a range selection device configured to select an operating range of the transmission is set to neutral and a scheduled gear state of the transmission is neutral with the selectable one-way clutch engaged or applied; or
setting or overriding, by the processor, the commanded gear state of the transmission to first gear freewheel when the range selection device is set to drive and the scheduled gear state of the transmission is first gear locked.

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Assignees

• Gm Global Tech Operations Llc

Inventors

• Vernekar Pratik Nagesh
• Comis Donald L
• Diaz Roberto

Classifications

• B60W2710/1005

  Transmission ratio engaged · CPC title

• B60W2710/02

  Clutches · CPC title

• B60W2510/10

  Change speed gearings · CPC title

• B60W2510/02

  Clutches · CPC title

• F16D2048/0221

  Valves for clutch control systems; Details thereof · CPC title