Control apparatus and control method for automatic transmission
US-2015377349-A1 · Dec 31, 2015 · US
System and method for optimizing downshifting of a transmission during vehicle deceleration
US8935068B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8935068-B2 |
| Application number | US-201313920168-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 18, 2013 |
| Priority date | May 7, 2013 |
| Publication date | Jan 13, 2015 |
| Grant date | Jan 13, 2015 |
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Abstract
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A method of selecting a gear ratio of a transmission. The method includes measuring a current road grade with a sensing device and communicating the current road grade measurement to the controller. The controller receives a signal corresponding to a service brake input and determines a desired maximum acceleration limit of the vehicle. The method also includes calculating a predicted vehicle acceleration, measuring a current vehicle acceleration, and calculating an error value as a function of the predicted vehicle acceleration and measured vehicle acceleration. The method also computes an estimated required tractive braking effort and estimated tractive braking effort for at least one of N automatically selectable gear ratios of the transmission and selects one gear ratio of the N automatically selectable gear ratios for the operation of the transmission based on a comparison of the estimated required tractive braking effort and estimated tractive braking effort.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of selecting a gear ratio of a transmission in a motor vehicle to produce an increase in negative input torque, the transmission including a controller and N automatically selectable gear ratios, comprising: measuring a current road grade with a sensing device and communicating the current road grade measurement to the controller; receiving by the controller a signal corresponding to a service brake input from the vehicle; determining by the con…
Assignees
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Classifications
- F16H61/68Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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Frequently asked questions
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- What does patent US8935068B2 cover?
- A method of selecting a gear ratio of a transmission. The method includes measuring a current road grade with a sensing device and communicating the current road grade measurement to the controller. The controller receives a signal corresponding to a service brake input and determines a desired maximum acceleration limit of the vehicle. The method also includes calculating a predicted vehicle a…
- Who is the assignee on this patent?
- Allison Transm Inc, Allison Transm Inc
- What technology area does this patent fall under?
- Primary CPC classification F16H61/68. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 13 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).