Method and Control Unit for Operating a Drive Train of a Vehicle
US-2024068563-A1 · Feb 29, 2024 · US
Fail-to-neutral system and method for a toroidal traction drive automatic transmission
US9103434B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9103434-B2 |
| Application number | US-201314084204-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 19, 2013 |
| Priority date | Dec 16, 2009 |
| Publication date | Aug 11, 2015 |
| Grant date | Aug 11, 2015 |
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Abstract
Official abstract text for this publication.
A fail-to-neutral diagnostic technique for a transmission that includes a variator may include monitoring a state of a pressure differential valve fluidly coupled to a high side pressure applied to at least one actuator coupled to at least one corresponding roller of the variator and also fluidly coupled to a low side pressure applied to the at least one actuator, determining from the state of the pressure differential valve a variator torque sign corresponding to whether torque transferred by the at least one roller is positive or negative, determining an expected variator torque sign based on current operating conditions of the transmission, and commanding the transmission to a true neutral condition if the determined variator torque sign is different from the expected variator torque sign.
First claim
Opening claim text (preview).
The invention claimed is: 1. A fail-to-neutral diagnostic method for a transmission including a variator, the method comprising: determining, by a control circuit of the transmission, a state of a pressure differential valve fluidly coupled to the variator; and commanding, by the control circuit, the transmission to a true neutral condition in response to the determined state of the pressure differential valve being different from an expected operating state of the pressure diff…
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Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
- F16H61/12Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Cross-Sectional Technologies · mapped topic
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- What does patent US9103434B2 cover?
- A fail-to-neutral diagnostic technique for a transmission that includes a variator may include monitoring a state of a pressure differential valve fluidly coupled to a high side pressure applied to at least one actuator coupled to at least one corresponding roller of the variator and also fluidly coupled to a low side pressure applied to the at least one actuator, determining from the state of …
- Who is the assignee on this patent?
- Allison Transm Inc
- What technology area does this patent fall under?
- Primary CPC classification F16H61/12. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Aug 11 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).