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Continuously variable transmission control apparatus

a transmission control and continuously variable technology, applied in the direction of gearing control, gearing elements, belts/chains/gearrings, etc., can solve the problem of operator feeling an excessive degree of vehicle acceleration

Inactive Publication Date: 2002-03-19
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It is a main object of the invention to provide an improved continuously variable transmission control which can provide a smooth engine brake force change to meet the operator's expectation therefor when the vehicle is coasting with the accelerator pedal being released.

Problems solved by technology

As a result, the operator would feel an excessive degree of vehicle acceleration in spite of the fact that the accelerator pedal is released and increase the frequency at which the operator depresses the brake pedal.

Method used

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  • Continuously variable transmission control apparatus
  • Continuously variable transmission control apparatus
  • Continuously variable transmission control apparatus

Examples

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Embodiment Construction

With reference to the drawings, and in particular to FIG. 1, there is shown a continuously variable transmission control apparatus for use with an automotive vehicle having an internal combustion engine 1. The engine 1 operates on command from an engine control unit 6 which controls the amount of fuel metered to the engine 1, the fuel-injection timing and the ignition-system spark-timing. For example, the amount of fuel metered to the engine, this being determined by the width of the electrical pulses applied to the fuel injector 4, is repetitively determined from calculations performed in the engine control unit 6 based on various conditions of the engine that are sensed during its operation. These sensed conditions include cylinder-head coolant temperature, ambient temperature, throttle position, engine load, engine speed, etc. The calculated value for the fuel-injection pulse-width is transferred to set the fuel injector 4 according to the calculated value therefor. A drive from ...

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PUM

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Abstract

An apparatus for controlling a continuously variable transmission for use with an automotive vehicle. The transmission is operable at a variable speed ratio for transmitting a drive from its input shaft to its output shaft. A target value for the speed of rotation of the input shaft of the transmission is calculated based on the sensed vehicle operating conditions including vehicle acceleration. A correction factor per predetermined unit time is calculated based on the sensed vehicle acceleration when the sensed vehicle acceleration exceeds a threshold value with the accelerator pedal released. The correction factor is added to the target input shaft speed value to correct the target input shaft speed value in an increasing direction at intervals of the predetermined unit time. The threshold value is decreased as the vehicle speed increases. The speed ratio is controlled to bring the input shaft speed into coincidence with the corrected target value.

Description

BACKGROUND OF THE INVENTIONThis invention relates to an apparatus for controlling a continuously variable transmission for use with an automotive vehicle to change the engine brake force when the vehicle is coasting.Some automotive vehicles employ a continuously variable transmission having an input shaft coupled to the engine and an output shaft coupled to the drive shaft for transmitting a drive from the engine to the drive shaft. Such a continuously variable transmission operates with a speed ratio controlled in a manner to bring the speed of rotation of the input shaft into coincidence with a target value calculated as a function of engine throttle position (or accelerator pedal position) and vehicle speed. It is the current practice to decrease the target input shaft speed value as the throttle position decreases. If the vehicle is coasting on a downhill slope, the operator will release the accelerator pedal. This causes the throttle position to decrease so that the target inpu...

Claims

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Application Information

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IPC IPC(8): F16H61/66F16H61/662F16H59/24F16H59/42F16H59/44F16H59/22F16H59/48F16H59/18
CPCF16H61/66254F16H59/22F16H59/24F16H59/42Y10T477/621F16H59/48Y10T477/62423F16H59/44F16H61/66
Inventor TOUKURA, NOBUSUKESATO, SHOJIRONABETA, TAKAYOSHIAKIYAMA, TADAYUKI
Owner NISSAN MOTOR CO LTD