GPS-based predictive shift schedule for automatic transmission
First Claim
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1. Method for modifying a default transmission shift schedule for a vehicle, comprising:
- monitoring current vehicle parameters including a current operator pedal position and a current vehicle speed;
determining future roadway information at a predetermined distance in front of the vehicle;
predicting future vehicle parameters at the predetermined distance in front of the vehicle, including;
predicting a future operator pedal position based upon the determined future roadway information, the current operator pedal position, and a predicted operator response to the determined future roadway information; and
predicting a future vehicle speed based upon the determined future roadway information, the current vehicle speed, and a predicted operator response to the determined future roadway information, the predicted operator response to the determined future roadway information including a desired lateral acceleration, indicative of a lateral acceleration that does not compromise a desired comfort level of a vehicle operator, such that operation at the predicted future vehicle speed would not result in the vehicle exceeding the desired lateral acceleration;
modifying the default transmission shift schedule based on the current vehicle parameters and the predicted future vehicle parameters, including both the predicted future operator pedal position and the predicted future vehicle speed based upon the predicted operator response to the determined future roadway information, comprising;
modeling a vehicle parameter trajectory based on the current vehicle parameters and the predicted future vehicle parameters;
comparing the vehicle parameter trajectory to the default transmission shift schedule and identifying gear level shifts that will occur in achieving the modeled vehicle parameter trajectory with the default transmission shift schedule; and
modifying the default transmission shift schedule based on the identified gear level shifts which the modeled vehicle parameter trajectory is indicative of.
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Abstract
A method for modifying a default transmission shift schedule for a vehicle includes monitoring current vehicle parameters and determining future roadway information at a predetermined distance in front of the vehicle. Future vehicle parameters are predicted based on the determined future roadway information. The default transmission shift schedule is modified based on the current vehicle parameters and the predicted future vehicle parameters.
24 Citations
18 Claims
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1. Method for modifying a default transmission shift schedule for a vehicle, comprising:
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monitoring current vehicle parameters including a current operator pedal position and a current vehicle speed; determining future roadway information at a predetermined distance in front of the vehicle; predicting future vehicle parameters at the predetermined distance in front of the vehicle, including; predicting a future operator pedal position based upon the determined future roadway information, the current operator pedal position, and a predicted operator response to the determined future roadway information; and predicting a future vehicle speed based upon the determined future roadway information, the current vehicle speed, and a predicted operator response to the determined future roadway information, the predicted operator response to the determined future roadway information including a desired lateral acceleration, indicative of a lateral acceleration that does not compromise a desired comfort level of a vehicle operator, such that operation at the predicted future vehicle speed would not result in the vehicle exceeding the desired lateral acceleration; modifying the default transmission shift schedule based on the current vehicle parameters and the predicted future vehicle parameters, including both the predicted future operator pedal position and the predicted future vehicle speed based upon the predicted operator response to the determined future roadway information, comprising; modeling a vehicle parameter trajectory based on the current vehicle parameters and the predicted future vehicle parameters; comparing the vehicle parameter trajectory to the default transmission shift schedule and identifying gear level shifts that will occur in achieving the modeled vehicle parameter trajectory with the default transmission shift schedule; and modifying the default transmission shift schedule based on the identified gear level shifts which the modeled vehicle parameter trajectory is indicative of. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Method for updating a default transmission shift map for a vehicle, comprising:
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monitoring a current operator torque request, a current vehicle speed and a current vehicle acceleration; determining upcoming roadway grade and upcoming roadway curvature through a window of route analysis based on GPS information in conjunction with one of a 3 D map database and analysis of past vehicle operator driving patterns; predicting an upcoming operator torque request through the window of route analysis based on the upcoming roadway grade, the current operator torque request, the current vehicle acceleration, and a predicted operator response to the determined future roadway information; predicting an upcoming vehicle speed through the window of route analysis based on the upcoming roadway curvature and a desired lateral acceleration, indicative of a lateral acceleration that does not compromise a desired comfort level of the vehicle operator, such that operation at the predicted upcoming vehicle speed would not result in the vehicle exceeding the desired lateral acceleration; and adjusting a gear level shift command from the default transmission shift map for the vehicle based on the predicted upcoming operator torque request and the predicted upcoming vehicle speed, predicted based upon the predicted operator response to the determined future roadway information, comprising; modeling a vehicle parameter trajectory based on the current operator torque request, the current vehicle speed and the current vehicle acceleration, and the predicted upcoming operator torque request and the predicted upcoming vehicle speed; comparing the vehicle parameter trajectory to the default transmission shift map and identifying gear level shifts that will occur in achieving the modeled vehicle parameter trajectory with the default transmission shift schedule; and adjusting the gear level shift command from the default transmission shift map for the vehicle based on the identified gear level shifts which the modeled vehicle parameter trajectory is indicative of. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification