Gradeability-based shift pattern control for an automatic transm

Details Gradeability-based shift pattern control for an automatic transm Gradeability-based shift pattern control for an automatic transm

1992-03-02

1992-12-22

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74856, 74861, 3644241, B60K 4106

Patent

active

051726092

ABSTRACT:
An improved shift pattern control in which successive upshifting and downshifting is avoided in conditions of above normal loading by inhibiting upshifting to a speed ratio having insufficient gradeability in relation to a measure of the actual loading. In essence, the control continually monitors the gradeability of the various forward speed ratios of the transmission in relation to a measure of the actual grade load to determine their excess gradeability, and removes from the shift pattern those speed ratios having insufficient excess gradeability. This ensures that the transmission will never be upshifted to a speed ratio that has insufficient gradeability for the given driving condition, thereby eliminating the successive upshifting and downshifting which occurs with conventional shift controls.

REFERENCES:
patent: 4258591 (1981-03-01), Eckert et al.
patent: 4389910 (1983-06-01), Lockhart
patent: 4660672 (1987-04-01), Katou
patent: 4896565 (1990-01-01), Simonyi et al.
patent: 5035157 (1991-07-01), Aoki et al.
patent: 5070746 (1991-12-01), Milunas et al.
07/696,424 U.S. Patent Application, Nitz et al., filed May 6, 1991.

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