System and method for controlling a transmission
First Claim
1. A system for selecting shift schedules of a transmission of a vehicle configured to change gears according to two or more shift schedules, the system comprising:
- a controller configured to;
receive a signal indicative of acceleration of the vehicle prior to a change of a gear of the transmission;
estimate tractive effort of the vehicle following the change of the gear of the transmission, the tractive effort estimation being based on at least an estimation of a road load on the vehicle and an estimate of vehicle mass, the vehicle mass estimation being based on acceleration of the vehicle after the change of the gear of the transmission; and
select between a first shift schedule and a second shift schedule based on the tractive effort estimation,wherein, if the tractive effort estimation is less than a threshold value, the controller selects the first shift schedule, and if the tractive effort estimation is at least equal to the threshold value, the controller selects the second shift schedule.
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Accused Products
Abstract
A system for selecting shift schedules of a transmission of a vehicle includes a controller configured to receive a signal indicative of acceleration of the vehicle prior to a change of a gear of the transmission. The controller is further configured to estimate tractive effort of the vehicle following the change of the gear of the transmission, the tractive effort estimation being based on at least an estimation of a road load on the vehicle. The controller is further configured to select between a first shift schedule and a second shift schedule based on the tractive effort estimation, wherein, if the tractive effort estimation is less than a threshold value, the controller selects the first shift schedule, and if the tractive effort estimation is at least equal to the threshold value, the controller selects the second shift schedule.
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Citations
20 Claims
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1. A system for selecting shift schedules of a transmission of a vehicle configured to change gears according to two or more shift schedules, the system comprising:
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a controller configured to; receive a signal indicative of acceleration of the vehicle prior to a change of a gear of the transmission; estimate tractive effort of the vehicle following the change of the gear of the transmission, the tractive effort estimation being based on at least an estimation of a road load on the vehicle and an estimate of vehicle mass, the vehicle mass estimation being based on acceleration of the vehicle after the change of the gear of the transmission; and select between a first shift schedule and a second shift schedule based on the tractive effort estimation, wherein, if the tractive effort estimation is less than a threshold value, the controller selects the first shift schedule, and if the tractive effort estimation is at least equal to the threshold value, the controller selects the second shift schedule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of selecting shift schedules of a transmission of a vehicle configured to change gears according to two or more shift schedules, the method comprising:
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measuring acceleration of the vehicle prior to changing a gear of the transmission; estimating tractive effort of the vehicle after changing the gear of the transmission, wherein estimating the tractive effort includes at least estimating a road load of the vehicle and estimating vehicle mass, wherein estimating the vehicle mass includes estimating vehicle mass based on acceleration of the vehicle after the change of the gear of the transmission; and selecting between a first shift schedule and a second shift schedule based on the estimated tractive effort, wherein, if the estimated tractive effort is less than a threshold value, the first shift schedule is selected and changing the gear of the transmission is delayed, and if the estimated tractive effort is at least equal to the threshold value, the second shift schedule is selected and changing the gear of the transmission is initiated. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A vehicle comprising:
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a chassis; an engine coupled to the chassis; a transmission coupled to the engine and configured to change gears according to two or more shift schedules; and a controller configured to; receive a signal indicative of acceleration of the vehicle prior to a change of a gear of the transmission; estimate tractive effort of the vehicle following the change of the gear of the transmission, the tractive effort estimation being based on at least an estimation of a road load on the vehicle and an estimation of vehicle mass, the vehicle mass estimation being based on acceleration of the vehicle after the change of the gear of the transmission; and select between a first shift schedule and a second shift schedule based on the tractive effort estimation, wherein, if the tractive effort estimation is less than a threshold value, the controller selects the first shift schedule, and if the tractive effort estimation is at least equal to the threshold value, the controller selects the second shift schedule. - View Dependent Claims (19, 20)
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Specification