System for selecting a transmission economy-based shift schedule
First Claim
1. A method of selecting an economy mode shift schedule for shifting a transmission between a plurality of selectable gear ranges, the transmission being coupled to a powered vehicle and having a transmission control circuit, and the vehicle having an input control circuit for controlling a powered input, comprising:
- calculating vehicle acceleration;
determining a change in accelerator pedal position;
determining a net tractive effort force of the vehicle for a current gear range of the transmission;
comparing the net tractive effort force for the current gear range to a maximum tractive effort force for a desired gear range;
selecting the economy mode shift schedule for the transmission based on the comparison; and
controlling shifting between one or more gear ranges of the transmission according to the economy mode shift schedule.
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Abstract
The present invention provides a method of selecting an economy mode shift schedule for a transmission coupled to a motor vehicle. The method includes calculating vehicle acceleration and determining a change in accelerator pedal position. Also, a net tractive effort force of the vehicle is determined for a current gear range of the transmission. Also, the method includes comparing the net tractive effort force for the current gear range to a maximum tractive effort force for a desired gear range and selecting the economy mode shift schedule for the transmission based on the comparison. The method further includes controlling shifting between one or more gear ranges of the transmission according to the economy mode shift schedule.
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Citations
35 Claims
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1. A method of selecting an economy mode shift schedule for shifting a transmission between a plurality of selectable gear ranges, the transmission being coupled to a powered vehicle and having a transmission control circuit, and the vehicle having an input control circuit for controlling a powered input, comprising:
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calculating vehicle acceleration; determining a change in accelerator pedal position; determining a net tractive effort force of the vehicle for a current gear range of the transmission; comparing the net tractive effort force for the current gear range to a maximum tractive effort force for a desired gear range; selecting the economy mode shift schedule for the transmission based on the comparison; and controlling shifting between one or more gear ranges of the transmission according to the economy mode shift schedule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of operating a motor vehicle at an optimal vehicle speed without negatively affecting vehicle productivity, the vehicle having an engine coupled to a transmission, comprising:
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(a) determining gear ratios of all gear ranges of the transmission; (b) receiving engine torque data as a function of engine speed for all gear ranges; (c) calculating vehicle acceleration and determining accelerator pedal position; (d) determining a net tractive effort force of the vehicle for a current gear range of the transmission; (e) comparing the vehicle acceleration to a first threshold, the accelerator pedal position to a second threshold, and the net tractive effort force to a third threshold; (f) selecting an economy mode shift schedule for the transmission based on the comparison; and (g) controlling shifting between one or more gear ranges of the transmission according to the economy mode shift schedule. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A method of selecting an economy mode shift schedule for a transmission having X selectable gear ranges and coupled to a powered vehicle, the transmission having a transmission control circuit and the vehicle having an engine control circuit for controlling an engine, comprising:
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calculating vehicle acceleration and a change in accelerator pedal position; computing a net tractive effort force of the vehicle for a current gear range N of the transmission, where N<
X;determining a maximum tractive effort force for all upshift gear ranges, the upshift gear ranges comprising gear ranges N+1, N+2, . . . , and N+J, where J=X−
N;comparing the net tractive effort force to each maximum tractive effort force; selecting the economy mode shift schedule for the transmission based on the comparison; and controlling shifting between gear range N and one of the upshift gear ranges. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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Specification