Speed change control method for an automatic transmission for vehicles
First Claim
1. A speed change control method for setting a gearshift position of an automatic transmission of a vehicle, the automatic transmission having a plurality of gearshift positions, to a position selected on the basis of vehicle speed and engine load, in accordance with a preset shift pattern for a first control mode, comprising the steps of:
- detecting at least one of parameter values which represent operating conditions of the vehicle, parameter values which represent a driver'"'"'s driving intention, and parameter values which represent road conditions;
selecting one of said gearshift positions by fuzzy inference in accordance with said detected at least one of the parameter values;
comparing the gearshift position selected by the fuzzy inference with a gearshift position selected in accordance with the preset shift pattern for said first control mode; and
setting the gearshift position of the automatic transmission to the position selected by the fuzzy inference only if the gearshift position selected by said fuzzy inference provides a lower vehicle speed than the vehicle speed provided by the gearshift position selected in accordance with the preset shift pattern for said first control mode.
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Accused Products
Abstract
In a speed change control method for setting the gearshift position of an automatic transmission for vehicles with a plurality of gearshift positions, to a position selected on the basis of vehicle speed and engine load, in accordance with a preset shift pattern for a first control mode, one of the gearshift positions is selected by fuzzy inference in accordance with at least one of parameter values which represent operating conditions of the vehicle, parameter values which represent driver'"'"'s driving intention, and parameter values which represent road conditions. Further, the gearshift position of the automatic transmission is set to the position selected by the fuzzy inference only if the gearshift position selected by the fuzzy inference provides a lower speed than that provided by the gearshift position selected in accordance with the shift pattern for the first control mode. Preferably, a plurality of control modes including the first control mode are provided, one of the control modes is selected by the fuzzy inference in accordance with at least the degree of winding and gradient of a road on which the vehicle is traveling, and a gearshift position to be set is selected in accordance with the selected control mode.
38 Citations
12 Claims
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1. A speed change control method for setting a gearshift position of an automatic transmission of a vehicle, the automatic transmission having a plurality of gearshift positions, to a position selected on the basis of vehicle speed and engine load, in accordance with a preset shift pattern for a first control mode, comprising the steps of:
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detecting at least one of parameter values which represent operating conditions of the vehicle, parameter values which represent a driver'"'"'s driving intention, and parameter values which represent road conditions; selecting one of said gearshift positions by fuzzy inference in accordance with said detected at least one of the parameter values; comparing the gearshift position selected by the fuzzy inference with a gearshift position selected in accordance with the preset shift pattern for said first control mode; and setting the gearshift position of the automatic transmission to the position selected by the fuzzy inference only if the gearshift position selected by said fuzzy inference provides a lower vehicle speed than the vehicle speed provided by the gearshift position selected in accordance with the preset shift pattern for said first control mode. - View Dependent Claims (2, 3)
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4. A speed change control method for setting a gearshift position of an automatic transmission of a vehicle, the automatic transmission having a plurality of gearshift positions, to a position selected in accordance with a preset control mode, comprising the steps of:
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setting a plurality of control modes in advance; detecting a steering angle and a lateral acceleration applied to the vehicle; calculating an effective value of a product of the detected values of steering angle and lateral acceleration; detecting at least a degree of winding based on the calculated effective value, and gradient of a road on which the vehicle is traveling; selecting one of said control modes in accordance with the detected degree of winding and gradient of the road; and selecting a gearshift position to be set in accordance with the selected control mode. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification