Method of selecting a transmission shift schedule

A technology of shifting regularity and transmission, applied in the direction of elements with teeth, transmission control, belt/chain/gear, etc., can solve problems such as difficulties

Inactive Publication Date: 2008-12-24
GENERAL MOTORS COMPANY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the variability of driving conditions such as road gradient and vehicle parameter

Method used

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  • Method of selecting a transmission shift schedule
  • Method of selecting a transmission shift schedule
  • Method of selecting a transmission shift schedule

Examples

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Embodiment Construction

[0027] The following description is merely exemplary in nature and is not intended to limit the invention and its uses.

[0028] refer to Figure 1A and 1B , numeral 10 generally shows a method for selecting a shift schedule for an automatic transmission in an automobile. An automobile (not shown) typically includes a powertrain with an engine and an automatic transmission. As the car travels, the slope of the road may vary between a flat slope and a steep slope, depending on the given route. In addition, the mass of the car may also change due to changes in the number of passengers, luggage, storage items, the presence of a trailer or other trailers, etc. Method 10 estimates the road gradient and vehicle mass at any given moment in order to select a shift schedule that suits the needs of the driver of the vehicle. Therefore, the method 10 runs continuously in real time.

[0029] Method 10 begins at step 11 where the controller determines whether a service brake is applied...

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Abstract

A method for selecting a shift schedule for a transmission in a motor vehicle is provided. The method includes the steps of determining whether a signal-to-noise ratio exceeds a threshold and calculating a tractive effort of the motor vehicle. A vehicle mass and a road grade is then estimated from the tractive effort using a recursive least squares estimator with multiple forgetting when the signal-to-noise ratio exceeds the threshold. A vehicle mass is selected and the road grade estimated from the vehicle mass and tractive effort when the signal-to-noise ratio does not exceed the threshold. A shift schedule is then selected based on the vehicle mass and the estimated road grade.

Description

technical field [0001] The present invention relates to transmissions, and more particularly to methods of selecting a transmission shift schedule in a motor vehicle. Background technique [0002] The statements in this section merely provide background information related to the present disclosure which may, but do not necessarily constitute, prior art. [0003] A motor vehicle with an automatic transmission that includes a shift schedule control strategy that functions to determine when the automatic transmission shifts from one gear ratio to another on the basis of a number of factors Compare. These factors typically include, but are not limited to, engine torque, vehicle speed, and accelerator pedal position. Any given shift schedule for a motor vehicle is a balance between fuel economy and performance, and, based on this balance characterizing the shift schedule, the obtained Any given shift schedule is classified as an economical shift schedule or a dynamic shift sc...

Claims

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Application Information

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IPC IPC(8): F16H59/00F16H59/14F16H59/36F16H59/48F16H59/66F16H59/52F16H59/68
CPCF16H59/52F16H59/66F16H61/0213B60W40/076B60W40/13
Inventor J·P·克雷斯
Owner GENERAL MOTORS COMPANY
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