Transmission control method
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTakehiko Nanri, Kunihiko Fukui
Life of this patent
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Abstract
A variable transmission system includes a continuously variable transmission, a shiftable sub-transmission in series with an output of the continuously variable transmission, and controller. A sensor senses a position of a driver's shift lever, and another sensor senses a gear position of the shiftable sub-transmission. The sensors report to the controller. If both sensors detect reverse drive conditions, the controller adjusts an angle of a swash plate of the continuously variable transmission for the reverse driving direction. If only one of the sensors indicates a rear drive condition, the controller compares an engine speed to a threshold value. If the engine speed exceeds the threshold value, the controller curbs the engine speed by cutting off the ignition.
Claims20
A method of controlling a variable transmission system, said method comprising the steps of:
- providing a continuously variable transmission, a shiftable sub-transmission in series with an output of the continuously variable transmission, and controller;
- sensing a position of a driver's shift lever;
- sensing a gear position of the shiftable sub-transmission;
- and
- if both of said sensing steps indicate rear travel conditions, causing the controller to run a reverse travel control algorithm for the variable transmission system.
A method of controlling a variable transmission system, said method comprising the steps of:
- providing a continuously variable transmission, a shiftable sub-transmission in series with an output of the continuously variable transmission, and controller;
- sensing a position of a driver's shift lever;
- sensing a gear position of the shiftable sub-transmission;
- and
- if only one of said sensing steps indicates a rear travel condition, comparing an engine speed to a threshold value, and based upon the comparison having the controller institute a control algorithm for the variable transmission system.
A variable transmission system comprising:
- a continuously variable transmission;
- a shiftable sub-transmission in series with an output of said continuously variable transmission;
- a first sensor for detecting when the shiftable sub-transmission is in a reverse drive condition;
- a driver's shift lever provided for the driver to select a drive direction;
- a second sensor for detecting when said shift lever is in a reverse drive condition;
- and
- a controller connected to said first and second sensors.
Dependencies are inferred from the claim text.