CONTROL SYSTEM FOR AUTOMATIC VEHICLE TRANSMISSIONS
First Claim
1. A system for controlling an automatic transmission of a vehicle having an input shaft connected to an internal combustion engine mounted on the vehicle and an output shaft connected to driven wheels of the vehicle, the transmission transmitting output torque generated by the engine to the driven wheels through the output shaft, comprising:
- operating condition detecting means for detecting operating conditions of the engine and the vehicle including at least a vehicle speed and a throttle opening;
grade parameter determining means for determining a grade parameter indicative of upgrade or downgrade of a road on which the vehicle runs;
shift program selecting means for selecting one from among a plurality of shift programs based on the determined grade parameter to determine a gear ratio based on the selected shift program;
road information outputting means for determining an instantaneous vehicle position and for outputting road information including that at the determined instantaneous vehicle position; and
grade parameter correcting means for correcting the grade parameter based on at least one of the outputted road information and the grade parameter;
wherein the shift program selecting means selects the one from among a plurality of shift programs based on the corrected grade parameters to determine the gear ratio based on the selected shift program.
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Accused Products
Abstract
A system for controlling an automatic transmission of a vehicle which determines a downgrade or upgrade parameter based on the vehicle acceleration and selects one from among a plurality of shift programs based on the determined grade parameter to determine a gear ratio based on the selected shift program. The system includes a navigation system which determines the instantaneous vehicle position and outputs road information including upgrade/downgrade condition of road including the determined instantaneous vehicle position. In the system, the grade parameter is corrected based on the navigation information and the grade parameter such that the one from among a plurality of shift programs is selected based on the corrected grade parameter, thereby enhancing drivability during downgrade running, without being affected even if the navigation information is temporarily invalid.
17 Citations
15 Claims
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1. A system for controlling an automatic transmission of a vehicle having an input shaft connected to an internal combustion engine mounted on the vehicle and an output shaft connected to driven wheels of the vehicle, the transmission transmitting output torque generated by the engine to the driven wheels through the output shaft, comprising:
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operating condition detecting means for detecting operating conditions of the engine and the vehicle including at least a vehicle speed and a throttle opening;
grade parameter determining means for determining a grade parameter indicative of upgrade or downgrade of a road on which the vehicle runs;
shift program selecting means for selecting one from among a plurality of shift programs based on the determined grade parameter to determine a gear ratio based on the selected shift program;
road information outputting means for determining an instantaneous vehicle position and for outputting road information including that at the determined instantaneous vehicle position; and
grade parameter correcting means for correcting the grade parameter based on at least one of the outputted road information and the grade parameter;
wherein the shift program selecting means selects the one from among a plurality of shift programs based on the corrected grade parameters to determine the gear ratio based on the selected shift program. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system according to
claim 13 , wherein the grade parameter correcting means corrects a downgrade parameter of the grade parameter when the vehicle runs on a downgrade road which has a comer ahead of the vehicle.
Specification