Continuously variable transmission control apparatus
a transmission control and continuously variable technology, applied in mechanical devices, transportation and packaging, gearboxes, etc., can solve the problems of engine brake force change against the operator's expectation, excessive vehicle acceleration, operator's sense of incompatibility with vehicle acceleration, etc., to minimize noise and smooth vehicle coasting
Inactive Publication Date: 2001-12-11
NISSAN MOTOR CO LTD
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- Application Information
AI Technical Summary
Benefits of technology
It is a main object of the invention to provide an improved continuously variable transmission control apparatus which permits smooth vehicle coasting with minimized noise.
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.
With such a conventional apparatus, however, the operator would feel a sense of incompatibility for the vehicle acceleration caused when the vehicle is coasting on a downhill slope if the vehicle speed comes out of a very narrow range, for example, 20 km / h or less.
One of problem associated with such a conventional continuously variable transmissions is an engine brake force change against the operator's expectation.
Method used
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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 control 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 th...
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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 and vehicle speed. The target input shaft speed value is corrected to bring the vehicle acceleration into a predetermined range in the presence of the released accelerator pedal indicative signal. The speed ratio is controlled to bring the input shaft speed into coincidence with the corrected target input shaft speed value. The corrected target input shaft speed value is restricted below an upper limit set based on the vehicle speed.
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 with the accelerator pedal being released.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 po...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F16H61/66F16H61/662F16H59/18F16H9/00F16H59/48F16H61/00F16H61/02F16H61/16
CPCF16H61/66254B60W2550/142F16H59/48F16H61/16Y10T477/62423F16H2059/186F16H2061/6611F16H2059/663B60W2552/15F16H59/00
Inventor TOUKURA, NOBUSUKE
Owner NISSAN MOTOR CO LTD